CA2498053C - Wireless local area network with clients having extended freedom of movement - Google Patents
Wireless local area network with clients having extended freedom of movement Download PDFInfo
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- CA2498053C CA2498053C CA2498053A CA2498053A CA2498053C CA 2498053 C CA2498053 C CA 2498053C CA 2498053 A CA2498053 A CA 2498053A CA 2498053 A CA2498053 A CA 2498053A CA 2498053 C CA2498053 C CA 2498053C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/30—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for calculating health indices; for individual health risk assessment
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/70—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for mining of medical data, e.g. analysing previous cases of other patients
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H70/00—ICT specially adapted for the handling or processing of medical references
- G16H70/60—ICT specially adapted for the handling or processing of medical references relating to pathologies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/2854—Wide area networks, e.g. public data networks
- H04L12/2856—Access arrangements, e.g. Internet access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/12—Access point controller devices
Abstract
A wireless virtual local area network (VLAN) and a device selectively connecting to the wireless VLAN over a second wireless network that may be independent of the wireless VLAN. The device is capable of connecting to at least the wireless VLAN and to the second wireless network. Wireless VLAN
access points are each connected to an Ethernet aggregation switch, which is VLAN aware and matches client traffic from connected access points with access VLANs. A wireless VLAN switch maintains an association table between access VLANs and core VLANs. The second wireless network may be remotely connected over the Internet or a private network to a tunnel endpoint. The tunnel endpoint is connected to the VLAN switch, which uses the association table to manage free-form client traffic between connected devices and other mobile stations at access VLANs and appropriate core VLANs.
access points are each connected to an Ethernet aggregation switch, which is VLAN aware and matches client traffic from connected access points with access VLANs. A wireless VLAN switch maintains an association table between access VLANs and core VLANs. The second wireless network may be remotely connected over the Internet or a private network to a tunnel endpoint. The tunnel endpoint is connected to the VLAN switch, which uses the association table to manage free-form client traffic between connected devices and other mobile stations at access VLANs and appropriate core VLANs.
Description
WIRELESS LOCAL AREA NETWORK WITH CLIENTS
HAVING EXTENDED FREEDOM OF MOVEMENT
BACKGROUND OF THE INVENTION
Field of the Invention The present invention is related to a wireless local area network (WLAN) and more particularly, to a WLAN with connected wireless communication devices.
Background Description The Institute of Electrical and Electronics Engineers (IEEE) wireless protocol designated 802.11b is an Ethernet local area network (LAN) variant. Ethernet technology has shown an amazing ability to adapt to new requirements, evolving from a simple 10 Mbps bus to gigabit full-duplex switched networks and to wireless LANs.
Ethernet is well understood and there is a wealth of experience with cost reduction and integration of Ethernet devices. Some current Ethernet interface cards (lOBaseT) retail at less than $10. 802.11b wireless LAN (WLAN) card technology is subject to the same economy of scale and prices have fallen to less than 30% of their relatively recent original prices. Given its track record, Ethernet is a low-risk, extensible technology suited, for example, to address challenges in wide-area mobility.
Consequently, WLAN technology has been characterized as a disruptive technology. In other words, WLAN technology may change paradigms and lead to unexpected and unpredictable market developments. Past examples of disruptive technologies are the telephone, the personal computer (PC) and the Internet.
Today, WLANs are becoming ubiquitous offering cheap solutions for both home and office networks. Currently however, there are three major limitations on WLAN
technology: speed, range and security.
HAVING EXTENDED FREEDOM OF MOVEMENT
BACKGROUND OF THE INVENTION
Field of the Invention The present invention is related to a wireless local area network (WLAN) and more particularly, to a WLAN with connected wireless communication devices.
Background Description The Institute of Electrical and Electronics Engineers (IEEE) wireless protocol designated 802.11b is an Ethernet local area network (LAN) variant. Ethernet technology has shown an amazing ability to adapt to new requirements, evolving from a simple 10 Mbps bus to gigabit full-duplex switched networks and to wireless LANs.
Ethernet is well understood and there is a wealth of experience with cost reduction and integration of Ethernet devices. Some current Ethernet interface cards (lOBaseT) retail at less than $10. 802.11b wireless LAN (WLAN) card technology is subject to the same economy of scale and prices have fallen to less than 30% of their relatively recent original prices. Given its track record, Ethernet is a low-risk, extensible technology suited, for example, to address challenges in wide-area mobility.
Consequently, WLAN technology has been characterized as a disruptive technology. In other words, WLAN technology may change paradigms and lead to unexpected and unpredictable market developments. Past examples of disruptive technologies are the telephone, the personal computer (PC) and the Internet.
Today, WLANs are becoming ubiquitous offering cheap solutions for both home and office networks. Currently however, there are three major limitations on WLAN
technology: speed, range and security.
The 802.11b standard supports speeds of up to 11 Mbs. However, 802.11 a and 802.11g are promising to deliver much higher speeds. Although range is limited, typically, to about fifty meters (50m) outdoors, tests have demonstrated a range capability of up to 20 miles using directional antennas. Work is continuing to expand the coverage of the wireless base stations. Wired Equivalent Privacy (WEP) for wireless networks has proven far less secure than was intended. The security limitations of WEP are now well understood and work is on-going to enhance these protocols to improve the security of wireless interfaces.
The IEEE 802.1Q virtual LAN (VLAN) protocol defines interoperability operation of VLAN bridges. 802.1Q permits the definition, operation and administration of VLAN topologies within a bridged LAN infrastructure, such that LANs of all types may be connected together by Media Access Control (MAC) bridges.
Heretofore, these Ethernet LAN variants have been relatively rigidly architected. Once attached or connected, a device could communicate freely with other attached devices. If after sending a request, however, the connection is lost prior to receiving a response, the response was lost. Once reconnected, whether to the same or a different port and, even prior to arrival of the response, the response was lost and the request had to be sent anew. This is still the case for state of the art VLANs and even for devices wirelessly connected to such a VLAN. So, if a wireless device that is connected to a VLAN through an access point leaves the access point's reception area, it must re-establish communications. This is true even if it never leaves the overall LAN reception area, i.e., the area covered by all connected access points, and even if it remains in the reception area of another connected access point.
Beyond the wireless LAN coverage area, the wireless device must find some other way to connect, either wired (for example with a modem) or wirelessly.
Other wireless technologies, especially wireless cell phone technologies, provide a more or less suitable connection (albeit an expensive one) when an access point isn't readily available. As wireless communications technology advances towards next generation higher speed communications, the performance of this type of alternate connection may become acceptable, but cost is still expected to be a barrier to exclusive use. So, wireless LAN connections will remain preferable.
Furthermore, manually switching between cellular (or other wireless communications technology) and a lower cost wireless LAN connection is very disruptive. Thus, someone that expects to be moving between areas where a wireless LAN connection may or may not be available, must either accept connection disruptions or pay a premium to connect to another wireless service to maintain a constant connection.
Thus, there is a need for a wireless LAN wherein a wirelessly connected device can roam freely and still maintain a connection to the wireless network, and that can maintain a connection even outside the range of the Wireless LAN
using a second network SUMMARY OF THE INVENTION
It is a purpose of the invention to improve user mobility on wireless networks;
It is yet another purpose of the invention to expand wireless device network connectivity availability;
It is yet another purpose of the invention to freely allow network clients wirelessly connected to a network to roam beyond the range of a currently connected access point while maintaining a network connection over a second network.
The present invention relates to a wireless virtual local area network (VLAN) and a device selectively connecting to the wireless VLAN either directly or indirectly over a second wireless network that may be independent of the wireless VLAN.
The device includes at least two wireless network connection capabilities, one for connecting to the VLAN and the second for connecting to the second wireless network The wireless VLAN may include multiple wireless access points, each connected to an Ethernet aggregation switch. Each Ethernet aggregation switch is VLAN aware and matches client traffic from connected access points with access VLANs. A wireless VLAN switch maintains an association table between access VLANs and core VLANs.
The second wireless network may be remotely connected over the Internet or a private network to a tunnel endpoint. The tunnel endpoint is connected to the VLAN switch, which uses the association table to manage free-form client traffic between connected devices and other mobile stations at access VLANs and appropriate core VLANs.
In one aspect of the present invention, there is provided a network with wireless access capability comprising: a plurality of wireless access points with a first communications protocol; at least one Ethernet aggregation switch, one of said plurality of access points being connected to said at least one Ethernet aggregation switch, said at least one Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from said connected access points with access VLANs; a free-form virtual network switch with a plurality of VLAN trunk interface ports, said at least one Ethernet aggregation switch connected to one of said plurality of VLAN trunk interface ports, client traffic passing between said access VLANs at each said connected Ethernet aggregation switch and appropriate core VLANs, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and at least one tunnel endpoint connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging an other wireless network to said free-form virtual network switch, said other wireless 4a network having a second communications protocol different than said first communications protocol, wherein client wireless devices having contact with said other wireless network selectively connect to said free-form virtual network switch through said tunnel endpoint whenever said plurality of wireless access points are unavailable.
In another aspect of the present invention, there is provided a network with wireless access capability comprising: a plurality of wireless access points with a first communications protocol; a plurality of mobile stations wirelessly connectable to said plurality of access points, at least one mobile station connectable to at least one other wireless network each having a communications protocol different than said first communications protocol;
Ethernet aggregation means for connecting one of said plurality of access points to said network, said Ethernet aggregation means being virtual LAN (VLAN) aware and matching client traffic from said plurality of access points with access VLANs; free-form virtual network switching means for switching client traffic between said access VLANs at said Ethernet aggregation means to appropriate core VLANs, said free-form virtual network switching means having a plurality of VLAN trunk interface ports, each said Ethernet aggregation means connected to one of said plurality of VLAN
trunk interface ports, the free-form virtual network switching means comprises: means for maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and tunnel endpoint means for terminating Ethernet packets tunnelling over other wireless networks and providing 4b terminated said Ethernet packets as client traffic to said free-form virtual network switching means, said tunnel endpoint means connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging said free-form virtual network switching means to said other wireless networks and providing a MAC address proxy for connected ones of said at least one mobile station, said free-form virtual network switching means switching client traffic from said tunnel endpoint means to appropriate core VLANs whenever said plurality of wireless access points are unavailable.
In another aspect of the present invention, there is provided a network with wireless access capability comprising: a plurality of wireless Ethernet access points;
at least one Ethernet aggregation switch, ones of said plurality of access points being connected to each said at least one Ethernet aggregation switch, said at least one Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from connected said access points with access VLANs; a free-form virtual network switch passing client traffic between said access VLANs at said at least one connected Ethernet aggregation switch and appropriate core VLANs, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and at least one tunnel endpoint bridging a cell phone network to said free-form virtual network switch, wherein client wireless Ethernet devices having contact with said cell phone network seamlessly connect to said free-form virtual network switch through said cell phone network to said tunnel endpoint whenever said plurality of wireless Ethernet access points are unavailable.
4c BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other objects, aspects and advantages will be better understood from the following detailed description of a preferred embodiment of the invention with reference to the drawings, in which:
Figure 1 shows an example of a free-form virtual local area network (FLAN);
Figure 2A shows an example of a preferred embodiment extended FLAN and mobile station (MS) capable of maintaining a connection beyond the coverage area described by the individual AP coverage areas;
Figure 2B shows the MS tunnelling through a second wireless network to maintain the connection with the FLAN;
Figures 3A-B show flow diagrams for FLAN switch packet handling, downstream packets at access ports and upstream packets at core ports;
Figure 4 is an example of VLAN configuration of an Ethernet aggregation switch;
Figure 5 shows an example of how a preferred FLAN
switch preprogrammed with default relationships relates VLAN/ports;
Figure 6 shows an example of how the core VLANs are mapped to logical interfaces.
DESCRIPTION OF PREFERRED EMBODIMENTS
The IEEE 802.1Q virtual LAN (VLAN) protocol defines interoperability operation of VLAN bridges. 802.1Q permits the definition, operation and administration of VLAN topologies within a bridged LAN infrastructure, such that LANs of all types may be connected together by Media Access Control (MAC) bridges.
Heretofore, these Ethernet LAN variants have been relatively rigidly architected. Once attached or connected, a device could communicate freely with other attached devices. If after sending a request, however, the connection is lost prior to receiving a response, the response was lost. Once reconnected, whether to the same or a different port and, even prior to arrival of the response, the response was lost and the request had to be sent anew. This is still the case for state of the art VLANs and even for devices wirelessly connected to such a VLAN. So, if a wireless device that is connected to a VLAN through an access point leaves the access point's reception area, it must re-establish communications. This is true even if it never leaves the overall LAN reception area, i.e., the area covered by all connected access points, and even if it remains in the reception area of another connected access point.
Beyond the wireless LAN coverage area, the wireless device must find some other way to connect, either wired (for example with a modem) or wirelessly.
Other wireless technologies, especially wireless cell phone technologies, provide a more or less suitable connection (albeit an expensive one) when an access point isn't readily available. As wireless communications technology advances towards next generation higher speed communications, the performance of this type of alternate connection may become acceptable, but cost is still expected to be a barrier to exclusive use. So, wireless LAN connections will remain preferable.
Furthermore, manually switching between cellular (or other wireless communications technology) and a lower cost wireless LAN connection is very disruptive. Thus, someone that expects to be moving between areas where a wireless LAN connection may or may not be available, must either accept connection disruptions or pay a premium to connect to another wireless service to maintain a constant connection.
Thus, there is a need for a wireless LAN wherein a wirelessly connected device can roam freely and still maintain a connection to the wireless network, and that can maintain a connection even outside the range of the Wireless LAN
using a second network SUMMARY OF THE INVENTION
It is a purpose of the invention to improve user mobility on wireless networks;
It is yet another purpose of the invention to expand wireless device network connectivity availability;
It is yet another purpose of the invention to freely allow network clients wirelessly connected to a network to roam beyond the range of a currently connected access point while maintaining a network connection over a second network.
The present invention relates to a wireless virtual local area network (VLAN) and a device selectively connecting to the wireless VLAN either directly or indirectly over a second wireless network that may be independent of the wireless VLAN.
The device includes at least two wireless network connection capabilities, one for connecting to the VLAN and the second for connecting to the second wireless network The wireless VLAN may include multiple wireless access points, each connected to an Ethernet aggregation switch. Each Ethernet aggregation switch is VLAN aware and matches client traffic from connected access points with access VLANs. A wireless VLAN switch maintains an association table between access VLANs and core VLANs.
The second wireless network may be remotely connected over the Internet or a private network to a tunnel endpoint. The tunnel endpoint is connected to the VLAN switch, which uses the association table to manage free-form client traffic between connected devices and other mobile stations at access VLANs and appropriate core VLANs.
In one aspect of the present invention, there is provided a network with wireless access capability comprising: a plurality of wireless access points with a first communications protocol; at least one Ethernet aggregation switch, one of said plurality of access points being connected to said at least one Ethernet aggregation switch, said at least one Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from said connected access points with access VLANs; a free-form virtual network switch with a plurality of VLAN trunk interface ports, said at least one Ethernet aggregation switch connected to one of said plurality of VLAN trunk interface ports, client traffic passing between said access VLANs at each said connected Ethernet aggregation switch and appropriate core VLANs, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and at least one tunnel endpoint connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging an other wireless network to said free-form virtual network switch, said other wireless 4a network having a second communications protocol different than said first communications protocol, wherein client wireless devices having contact with said other wireless network selectively connect to said free-form virtual network switch through said tunnel endpoint whenever said plurality of wireless access points are unavailable.
In another aspect of the present invention, there is provided a network with wireless access capability comprising: a plurality of wireless access points with a first communications protocol; a plurality of mobile stations wirelessly connectable to said plurality of access points, at least one mobile station connectable to at least one other wireless network each having a communications protocol different than said first communications protocol;
Ethernet aggregation means for connecting one of said plurality of access points to said network, said Ethernet aggregation means being virtual LAN (VLAN) aware and matching client traffic from said plurality of access points with access VLANs; free-form virtual network switching means for switching client traffic between said access VLANs at said Ethernet aggregation means to appropriate core VLANs, said free-form virtual network switching means having a plurality of VLAN trunk interface ports, each said Ethernet aggregation means connected to one of said plurality of VLAN
trunk interface ports, the free-form virtual network switching means comprises: means for maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and tunnel endpoint means for terminating Ethernet packets tunnelling over other wireless networks and providing 4b terminated said Ethernet packets as client traffic to said free-form virtual network switching means, said tunnel endpoint means connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging said free-form virtual network switching means to said other wireless networks and providing a MAC address proxy for connected ones of said at least one mobile station, said free-form virtual network switching means switching client traffic from said tunnel endpoint means to appropriate core VLANs whenever said plurality of wireless access points are unavailable.
In another aspect of the present invention, there is provided a network with wireless access capability comprising: a plurality of wireless Ethernet access points;
at least one Ethernet aggregation switch, ones of said plurality of access points being connected to each said at least one Ethernet aggregation switch, said at least one Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from connected said access points with access VLANs; a free-form virtual network switch passing client traffic between said access VLANs at said at least one connected Ethernet aggregation switch and appropriate core VLANs, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and at least one tunnel endpoint bridging a cell phone network to said free-form virtual network switch, wherein client wireless Ethernet devices having contact with said cell phone network seamlessly connect to said free-form virtual network switch through said cell phone network to said tunnel endpoint whenever said plurality of wireless Ethernet access points are unavailable.
4c BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing and other objects, aspects and advantages will be better understood from the following detailed description of a preferred embodiment of the invention with reference to the drawings, in which:
Figure 1 shows an example of a free-form virtual local area network (FLAN);
Figure 2A shows an example of a preferred embodiment extended FLAN and mobile station (MS) capable of maintaining a connection beyond the coverage area described by the individual AP coverage areas;
Figure 2B shows the MS tunnelling through a second wireless network to maintain the connection with the FLAN;
Figures 3A-B show flow diagrams for FLAN switch packet handling, downstream packets at access ports and upstream packets at core ports;
Figure 4 is an example of VLAN configuration of an Ethernet aggregation switch;
Figure 5 shows an example of how a preferred FLAN
switch preprogrammed with default relationships relates VLAN/ports;
Figure 6 shows an example of how the core VLANs are mapped to logical interfaces.
DESCRIPTION OF PREFERRED EMBODIMENTS
Figure 1 shows an example of a free-form virtual local area network (FLAN) 100 with wireless access capability as described in U.S. Patent Application No.
10/140,629 entitled "LOCAL AREA NETWORK WITH WIRELESS CLIENT
FREEDOM OF MOVEMENT" to Matthew G. Eglin, filed May 8, 2002, and assigned to the assignee of the present invention. Wireless clients/mobile stations connect to the FLAN 100 and, once connected, roam freely within the wireless coverage area, seamlessly swapping wireless connection from one access point to another access point as they roam. The present invention extends the wireless client roaming capability beyond the FLAN wireless coverage area for appropriately equipped wireless client devices.
Normally, wireless client devices or mobile stations (MS) 102, 104 are connected by wireless data links to one of numerous access points (APs) 106, 108, 110, 112, 114, 116. Examples of such mobile stations 102, 104 or wireless client devices may include what is known as a personal digital assistant (PDA), a cellular (cell) phone (in particular an Internet capable cell phone), a notebook computer/wireless tablet, a desktop computer or, a vehicle such as a train with an on-board network that has wireless communications capability. Provided the MS
102, 104 is within range of at least one of the APs 106, 108, 110, 112, 114 or 116, connection to the FLAN 100 is through that AP 106, 108, 110, 112, 114, 116.
Each AP 106, 108, 110, 112, 114, 116 is connected to an Ethernet aggregation switch 118.
Each aggregation switch 118 aggregates all client traffic from connected APs 106, 108, 110, 112, 114, 116, passing it upstream to a preferred free-form virtual network switch or FLAN switch 120. Optionally, a preferred embodiment network may include more than one layer of aggregation switches 118 and/or FLAN switches 120.
Although not indicated in this example, according to a preferred embodiment of the invention in addition to WLAN connection capability, at least one MS
(e.g., a PDA, cell phone, notebook computer or wireless tablet) includes at least one other wireless communications capability (e.g., cell phone capable) for connecting to another wireless network. Thus, whenever the MS strays beyond the wireless coverage area MS or otherwise loses a WLAN connection, this other, second wireless capability continues a virtual connection to the FLAN 100 through that other wireless network, thereby avoiding a service disruption. Examples of such other wireless communications capability may include a communications capability based in, Global System for Mobile Communication (GSM), General Packet Radio Service (GPRS), third generation (3G) wireless technology, code division multiple access 2000 (CDMA2000) technology or in any other appropriate wireless communications technology. For example, such a MS 102, 104 might include a CDMA2000 transceiver and an 802.11b Ethernet adapter.
The FLAN switch 120 may be connected through a typical router 122 to a typical Dynamic Host Configuration Protocol (DHCP) Server 124 and to a public network, e.g., to the Internet 126. For optional security, the router 122 also connects externally through a typical gateway 128 providing access control, network address translation (NAT) and a firewall. Each FLAN switch 120 may have multiple VLAN
trunk interfaces 130, 132. FLAN switch interfaces 130 connected to aggregation switches 118 are referred to herein as access ports and packets arriving at access ports 130 are downstream packets. FLAN switch interfaces 132 connected to routers are referred to herein as core ports and packets arriving at core ports 132 are upstream packets.
A VLAN-aware switch refers to an Ethernet switch that associates each frame with a single VLAN, e.g., Ethernet aggregation switch 118. A typical VLAN-aware switch includes an association table where each row contains a MAC address, a VLAN ID and a port. Thus, a VLAN aware switch forwards each frame to a MAC
address based upon that single associated VLAN. By contrast, a preferred FLAN
switch 120 associates each frame with two VLANs, one at an access port 130 and the other at a core port 132. To that end, each FLAN switch 120 maintains a port association table where each row contains a MAC address, an access port/VLAN
pair, and a core port/VLAN pair. Further, aggregation switches 118 are configured to statically map each of the access ports to a different VLAN on its trunk port.
Optionally, each aggregation switch 118 may share VLANs among multiple APs 106, 108, 110, 112, 114, 116, each one connected to a different port. VLAN sharing may be appropriate to minimize the number of VLAN IDs used. However, since there are more available VLAN IDs (4094) than ports on any one aggregation switch 118, normally, the FLAN switch 120 can reuse VLAN IDs on different aggregation switches 118 making sharing VLAN IDs unnecessary.
For FLAN 100 the transmission/reception range of each AP 106, 108, 110, 112, 114, 116 is selected such that the coverage area for each overlaps other adjacent access points providing uninterrupted service for the intended coverage area.
Connected mobile stations 102, 104 can pass between access point reception areas and still remain connected in constant communication with FLAN 100, provided they remain in contact with at least one AP 106, 108, 110, 112, 114, 116. The aggregation switch 118 passes data between APs 106, 108, 110, 112, 114, 116 and FLAN
switch 120, which seamlessly routes data between mobile stations 102, 104, and, for example, a selected Internet 126 address. When a mobile station 102, 104 moves from one access point reception area (e.g., 110) to another (e.g., 116), data transmission to/from the particular mobile station 102, 104 is automatically conveyed correctly over the rest of FLAN 100 without any manual intervention. Thus, the MS
102, 104 can remain connected until it leaves/is removed from the coverage area, i.e., cannot contact any of the APs 106, 108, 110, 112, 114 or 116. A mobile station equipped with a capability of connecting to at least one other wireless network according to the present invention can maintain this connection, even when it is not in the FLAN 100 coverage area.
So, Figure 2A shows an example of a preferred embodiment extended FLAN
300 according to the present invention with elements identical to those of in Figure 1 labeled identically. The connection region for MS 302 extends beyond the coverage area described by the individual AP coverage areas. Each MS 302 has at least two independent wireless communication capabilities, preferably a WLAN
capability 304 (e.g., through an on-board WLAN card or interface) for communicating both to APs 108, 110, 112, 114 and 116 and an alternate communications protocol connection 306 (e.g., through a cell phone module) to alternate connection wireless network 308. This second or alternate connection second wireless network 308, which may itself be another WLAN interface, connects over the Internet or over a private network 310 to an appropriate tunnel endpoint 312, which provides an Ethernet Bridge across the particular second wireless network 308.
Tunnel endpoint 312 is connected to FLAN switch 120 over an VLAN trunk interface 314, which is substantially identical to access ports 130.
In this example MS 302 includes both a WLAN connection capability (e.g., 802.1 lb wireless Ethernet) and at least one alternate or second wireless communications capability, e.g., CDMA2000, GSM, GPRS or 3G. It should be noted that while wireless client devices such as MS 102, 104 of Figure 1 with a single wireless capability connecting to APs 108, 110, 112, 114 and 116, but without the capability to connect to a second network may be included in an extended FLAN
of the present invention; they would not normally have access to the FLAN 300 outside of the coverage area afforded by APs 108, 110, 112, 114, 116. Further, whenever it is in range, MS 302 communicates with the FLAN 300 through an AP
108, 110, 112, 114 or 116 identically with MS 102, 104.
As shown in Figure 2B, whenever the client (MS 302) strays beyond the AP
coverage area or for whatever reason cannot connect to an AP 108, 110, 112, 114 or 116, e.g., when access point carrier signal falls below a selected level indicating the absence of an available AP108, 110, 112, 114, 116, MS 302 automatically switches to its alternate connection through second network 308. Monitoring signal strength is well known and displayed on most commercially available cell phones When MS
302 switches connection, it sends packets through a layer 2 tunne1320 that to the FLAN 300 appears to be the client's WLAN interface. Ethernet frames or packets containing the MAC and IP addresses of the client's WLAN interface (e.g., WLAN
card) tunnel over the second network to the tunnel endpoint 312. The tunnel endpoint 312 terminates the layer 2 tunnel 320 and passes Ethernet frames from clients (e.g., MS 302) over VLAN trunk interface 314 to FLAN switch 120. Each such connected MS 302 maintains this layer 2 tunne1320, which carries Ethernet packets across the second network 308 to the tunnel endpoint 312 and then, to the FLAN switch 120, thereby seamlessly maintaining connection to the FLAN 300.
When the connection switches to the second network 308, FLAN switch 120 just sees another port change for the client, a normal FLAN mobility event.
Thus, the switch to the second network 308 is invisible to the FLAN 300. When the client moves back into the connection area, it (MS 302) may automatically terminate the layer 2 tunnel 320 and switch its connection from the second network interface, i.e., from 306 to 304 in Figure 2A. This switch is simply made by resuming Ethernet Frame transmission on the WLAN interface 304, again a normal FLAN mobility event. The layer 2 tunnel may be maintained, but not used, while the client is connected to the WLAN, if the network requires very fast hand-off from WLAN to the second network.
Figures 3A-B show flow diagrams for FLAN switch packet handling for downstream packets at access ports in flow diagram 140 and, for upstream packets at core ports in flow diagram 160 according to a preferred embodiment of the present invention. In Figure 3A a downstream packet is received at an access port in step 142. If the downstream packet is a DHCP request, the router (122 in Figures 1 and 2A-B) acts as a DHCP relay agent and passes the packet to the DHCP Server 124.
The DHCP Server 124, in addition to otherwise functioning as a normal DHCP
Server, returns an address to the client, thereby configuring the client (e.g., MS 102, 104 and 302) and, switches to pass the traffic. The DHCP Server 124 can re-assign the client 102, 104, 302 to a subnet that does not match a default VLAN
assigned by the FLAN switch 120. When the MS 102, 104, 302 is assigned to a subnet other than the default, the DHCP response is directed to the appropriate DHCP relay agent and on to the correct VLAN.
So, continuing in step 144 the port association table is checked to determine if the frame includes the MAC address of a currently connected MS 102, 104, 302.
If the packet does not originate from a current connection, then in step 146, a new connection is configured by entering the source MAC address, the access port/VLAN
and default core port/VLAN information in the port association table. The default core port/VLAN is related to the incoming access port/VLAN. In step 148 the appropriate VLAN tag is changed to reflect the new default core VLAN for the downstream packet. Then, in step 150 the packet is switched to the default core port.
If in step 144, however, the MAC address is identified as being to a currently 5 connected MS 102, 104, 302, then in step 152, the port association table is checked to determine if the access port/VLAN has changed. The access port/VLAN may change when the mobile station (e.g., 302) roams between AP reception areas or in and out of the coverage area, e.g., out of the coverage area at first wireless access point 110 in Figure 1 and, later, back into the coverage area at another wireless access point 116.
10/140,629 entitled "LOCAL AREA NETWORK WITH WIRELESS CLIENT
FREEDOM OF MOVEMENT" to Matthew G. Eglin, filed May 8, 2002, and assigned to the assignee of the present invention. Wireless clients/mobile stations connect to the FLAN 100 and, once connected, roam freely within the wireless coverage area, seamlessly swapping wireless connection from one access point to another access point as they roam. The present invention extends the wireless client roaming capability beyond the FLAN wireless coverage area for appropriately equipped wireless client devices.
Normally, wireless client devices or mobile stations (MS) 102, 104 are connected by wireless data links to one of numerous access points (APs) 106, 108, 110, 112, 114, 116. Examples of such mobile stations 102, 104 or wireless client devices may include what is known as a personal digital assistant (PDA), a cellular (cell) phone (in particular an Internet capable cell phone), a notebook computer/wireless tablet, a desktop computer or, a vehicle such as a train with an on-board network that has wireless communications capability. Provided the MS
102, 104 is within range of at least one of the APs 106, 108, 110, 112, 114 or 116, connection to the FLAN 100 is through that AP 106, 108, 110, 112, 114, 116.
Each AP 106, 108, 110, 112, 114, 116 is connected to an Ethernet aggregation switch 118.
Each aggregation switch 118 aggregates all client traffic from connected APs 106, 108, 110, 112, 114, 116, passing it upstream to a preferred free-form virtual network switch or FLAN switch 120. Optionally, a preferred embodiment network may include more than one layer of aggregation switches 118 and/or FLAN switches 120.
Although not indicated in this example, according to a preferred embodiment of the invention in addition to WLAN connection capability, at least one MS
(e.g., a PDA, cell phone, notebook computer or wireless tablet) includes at least one other wireless communications capability (e.g., cell phone capable) for connecting to another wireless network. Thus, whenever the MS strays beyond the wireless coverage area MS or otherwise loses a WLAN connection, this other, second wireless capability continues a virtual connection to the FLAN 100 through that other wireless network, thereby avoiding a service disruption. Examples of such other wireless communications capability may include a communications capability based in, Global System for Mobile Communication (GSM), General Packet Radio Service (GPRS), third generation (3G) wireless technology, code division multiple access 2000 (CDMA2000) technology or in any other appropriate wireless communications technology. For example, such a MS 102, 104 might include a CDMA2000 transceiver and an 802.11b Ethernet adapter.
The FLAN switch 120 may be connected through a typical router 122 to a typical Dynamic Host Configuration Protocol (DHCP) Server 124 and to a public network, e.g., to the Internet 126. For optional security, the router 122 also connects externally through a typical gateway 128 providing access control, network address translation (NAT) and a firewall. Each FLAN switch 120 may have multiple VLAN
trunk interfaces 130, 132. FLAN switch interfaces 130 connected to aggregation switches 118 are referred to herein as access ports and packets arriving at access ports 130 are downstream packets. FLAN switch interfaces 132 connected to routers are referred to herein as core ports and packets arriving at core ports 132 are upstream packets.
A VLAN-aware switch refers to an Ethernet switch that associates each frame with a single VLAN, e.g., Ethernet aggregation switch 118. A typical VLAN-aware switch includes an association table where each row contains a MAC address, a VLAN ID and a port. Thus, a VLAN aware switch forwards each frame to a MAC
address based upon that single associated VLAN. By contrast, a preferred FLAN
switch 120 associates each frame with two VLANs, one at an access port 130 and the other at a core port 132. To that end, each FLAN switch 120 maintains a port association table where each row contains a MAC address, an access port/VLAN
pair, and a core port/VLAN pair. Further, aggregation switches 118 are configured to statically map each of the access ports to a different VLAN on its trunk port.
Optionally, each aggregation switch 118 may share VLANs among multiple APs 106, 108, 110, 112, 114, 116, each one connected to a different port. VLAN sharing may be appropriate to minimize the number of VLAN IDs used. However, since there are more available VLAN IDs (4094) than ports on any one aggregation switch 118, normally, the FLAN switch 120 can reuse VLAN IDs on different aggregation switches 118 making sharing VLAN IDs unnecessary.
For FLAN 100 the transmission/reception range of each AP 106, 108, 110, 112, 114, 116 is selected such that the coverage area for each overlaps other adjacent access points providing uninterrupted service for the intended coverage area.
Connected mobile stations 102, 104 can pass between access point reception areas and still remain connected in constant communication with FLAN 100, provided they remain in contact with at least one AP 106, 108, 110, 112, 114, 116. The aggregation switch 118 passes data between APs 106, 108, 110, 112, 114, 116 and FLAN
switch 120, which seamlessly routes data between mobile stations 102, 104, and, for example, a selected Internet 126 address. When a mobile station 102, 104 moves from one access point reception area (e.g., 110) to another (e.g., 116), data transmission to/from the particular mobile station 102, 104 is automatically conveyed correctly over the rest of FLAN 100 without any manual intervention. Thus, the MS
102, 104 can remain connected until it leaves/is removed from the coverage area, i.e., cannot contact any of the APs 106, 108, 110, 112, 114 or 116. A mobile station equipped with a capability of connecting to at least one other wireless network according to the present invention can maintain this connection, even when it is not in the FLAN 100 coverage area.
So, Figure 2A shows an example of a preferred embodiment extended FLAN
300 according to the present invention with elements identical to those of in Figure 1 labeled identically. The connection region for MS 302 extends beyond the coverage area described by the individual AP coverage areas. Each MS 302 has at least two independent wireless communication capabilities, preferably a WLAN
capability 304 (e.g., through an on-board WLAN card or interface) for communicating both to APs 108, 110, 112, 114 and 116 and an alternate communications protocol connection 306 (e.g., through a cell phone module) to alternate connection wireless network 308. This second or alternate connection second wireless network 308, which may itself be another WLAN interface, connects over the Internet or over a private network 310 to an appropriate tunnel endpoint 312, which provides an Ethernet Bridge across the particular second wireless network 308.
Tunnel endpoint 312 is connected to FLAN switch 120 over an VLAN trunk interface 314, which is substantially identical to access ports 130.
In this example MS 302 includes both a WLAN connection capability (e.g., 802.1 lb wireless Ethernet) and at least one alternate or second wireless communications capability, e.g., CDMA2000, GSM, GPRS or 3G. It should be noted that while wireless client devices such as MS 102, 104 of Figure 1 with a single wireless capability connecting to APs 108, 110, 112, 114 and 116, but without the capability to connect to a second network may be included in an extended FLAN
of the present invention; they would not normally have access to the FLAN 300 outside of the coverage area afforded by APs 108, 110, 112, 114, 116. Further, whenever it is in range, MS 302 communicates with the FLAN 300 through an AP
108, 110, 112, 114 or 116 identically with MS 102, 104.
As shown in Figure 2B, whenever the client (MS 302) strays beyond the AP
coverage area or for whatever reason cannot connect to an AP 108, 110, 112, 114 or 116, e.g., when access point carrier signal falls below a selected level indicating the absence of an available AP108, 110, 112, 114, 116, MS 302 automatically switches to its alternate connection through second network 308. Monitoring signal strength is well known and displayed on most commercially available cell phones When MS
302 switches connection, it sends packets through a layer 2 tunne1320 that to the FLAN 300 appears to be the client's WLAN interface. Ethernet frames or packets containing the MAC and IP addresses of the client's WLAN interface (e.g., WLAN
card) tunnel over the second network to the tunnel endpoint 312. The tunnel endpoint 312 terminates the layer 2 tunnel 320 and passes Ethernet frames from clients (e.g., MS 302) over VLAN trunk interface 314 to FLAN switch 120. Each such connected MS 302 maintains this layer 2 tunne1320, which carries Ethernet packets across the second network 308 to the tunnel endpoint 312 and then, to the FLAN switch 120, thereby seamlessly maintaining connection to the FLAN 300.
When the connection switches to the second network 308, FLAN switch 120 just sees another port change for the client, a normal FLAN mobility event.
Thus, the switch to the second network 308 is invisible to the FLAN 300. When the client moves back into the connection area, it (MS 302) may automatically terminate the layer 2 tunnel 320 and switch its connection from the second network interface, i.e., from 306 to 304 in Figure 2A. This switch is simply made by resuming Ethernet Frame transmission on the WLAN interface 304, again a normal FLAN mobility event. The layer 2 tunnel may be maintained, but not used, while the client is connected to the WLAN, if the network requires very fast hand-off from WLAN to the second network.
Figures 3A-B show flow diagrams for FLAN switch packet handling for downstream packets at access ports in flow diagram 140 and, for upstream packets at core ports in flow diagram 160 according to a preferred embodiment of the present invention. In Figure 3A a downstream packet is received at an access port in step 142. If the downstream packet is a DHCP request, the router (122 in Figures 1 and 2A-B) acts as a DHCP relay agent and passes the packet to the DHCP Server 124.
The DHCP Server 124, in addition to otherwise functioning as a normal DHCP
Server, returns an address to the client, thereby configuring the client (e.g., MS 102, 104 and 302) and, switches to pass the traffic. The DHCP Server 124 can re-assign the client 102, 104, 302 to a subnet that does not match a default VLAN
assigned by the FLAN switch 120. When the MS 102, 104, 302 is assigned to a subnet other than the default, the DHCP response is directed to the appropriate DHCP relay agent and on to the correct VLAN.
So, continuing in step 144 the port association table is checked to determine if the frame includes the MAC address of a currently connected MS 102, 104, 302.
If the packet does not originate from a current connection, then in step 146, a new connection is configured by entering the source MAC address, the access port/VLAN
and default core port/VLAN information in the port association table. The default core port/VLAN is related to the incoming access port/VLAN. In step 148 the appropriate VLAN tag is changed to reflect the new default core VLAN for the downstream packet. Then, in step 150 the packet is switched to the default core port.
If in step 144, however, the MAC address is identified as being to a currently 5 connected MS 102, 104, 302, then in step 152, the port association table is checked to determine if the access port/VLAN has changed. The access port/VLAN may change when the mobile station (e.g., 302) roams between AP reception areas or in and out of the coverage area, e.g., out of the coverage area at first wireless access point 110 in Figure 1 and, later, back into the coverage area at another wireless access point 116.
10 If the access pordVLAN is unchanged, then, continuing to step 148 the package is updated with the appropriate VLAN tag and in step 150 switched to the appropriate identified core port. Otherwise, if the access port/VLAN is changed in step 152; then, in step 154 the port association table is updated and in step 148 the VLAN tag is changed. Then, in step 150 the packet is switched to the appropriate identified core port.
Similarly, in step 162 of Figure 3B, when a packet is received at a core port, in step 164 the packet frame is checked for a known destination. If the upstream packet is not directed to a known destination, then, it is not intended for any currently connected MS (e.g., 102, 104 or 302) and, in step 166 the packet is dropped.
If, however, the frame includes the destination MAC for a connected MS 102, 102 or 302, the packet is for a known destination. Then, in step 168, the association table is checked to determine if the client association has changed from the most recent communication with that client. The association table may have changed because the identified core VLAN may have changed in a DHCP response or, because the MS
102, 104, 302 has been assigned to a VLAN other than the default for its incoming port. Also, the VLAN and the port may both change if there is a fail over to a backup router. If the client association is unchanged, then, in step 170 the VLAN tag is changed to reflect the correct access VLAN for the packet. If the port association has changed, then in step 172 the port association table is updated before the VLAN tag is changed in step 170. Then, in step 174 the packet is switched to its access port.
Similarly, in step 162 of Figure 3B, when a packet is received at a core port, in step 164 the packet frame is checked for a known destination. If the upstream packet is not directed to a known destination, then, it is not intended for any currently connected MS (e.g., 102, 104 or 302) and, in step 166 the packet is dropped.
If, however, the frame includes the destination MAC for a connected MS 102, 102 or 302, the packet is for a known destination. Then, in step 168, the association table is checked to determine if the client association has changed from the most recent communication with that client. The association table may have changed because the identified core VLAN may have changed in a DHCP response or, because the MS
102, 104, 302 has been assigned to a VLAN other than the default for its incoming port. Also, the VLAN and the port may both change if there is a fail over to a backup router. If the client association is unchanged, then, in step 170 the VLAN tag is changed to reflect the correct access VLAN for the packet. If the port association has changed, then in step 172 the port association table is updated before the VLAN tag is changed in step 170. Then, in step 174 the packet is switched to its access port.
So, for a packet traveling from a mobile station 102, 104 on layer 2 of the access network on the access side of the FLAN switch 120 or from MS 302 over the second communications network; the packet is assigned to a VLAN based on the mobile station's physical location in the network, i.e., the port for its connected Access Point 106, 108, 110, 112, 114, 116 or from tunnel endpoint 312. A
packet on the core side of the FLAN switch 120 traveling to a mobile station, is assigned to a VLAN based on the mobile station's logical location in the network, or, equivalently, the mobile station's IP subnet.
Figure 4 is an example of VLAN configuration of an Ethernet aggregation switch 118 according to a preferred embodiment of the present invention.
Preferably, the FLAN switch 120 meshes through VLAN trunk interface 130 with the VLAN
configuration of Ethernet aggregation switches 118, the router 122 and the tunnel endpoint 312. In this example, APs 180 are grouped and each group 182, 184, 186 is connected through a hub 182h, 184h, if appropriate. Hubs 182h, 184h and individual APs (i.e. single AP groups 186) are connected to Ethernet aggregation switch ports 188, 190, 192. Each of these Ethernet switch ports 188, 190, 192 is mapped to an individual VLAN 194, 196, 198 on a VLAN trunk 200 connected to a FLAN access port. Each AP group 182, 184, 186 is mapped individually; there are no layer 2 connections between the AP groups 182, 184, 186 within the Ethernet aggregation switch 118.
Figure 5 shows an example of how a preferred FLAN switch 120, preprogrammed with default relationships, relates VLANs 194, 196, 198, 202, 204, 206, 208, 210 on access port 212 and core port 214 of the FLAN switch 120.
Default association table 216 provides default VLAN pairs as well as fixed core VLAN
assignment for the FLAN switch 120. Devices that access special networks or devices requiring fixed IP addresses are assigned by MAC address in association table 218. These relationships may be stored in clear text configuration files and modified using any suitable text editor.
In this example, the FLAN switch 120 is aware of three mobile stations with MAC addresses ABC, XYZ and 456, all at Port 6, as indicated in association table 218. The VLAN ID numbers (e.g., 1, 2, 3, 4, 21, 22, 23, 24) are unique, but a pordVLAN tuple identifies the source and destination of a packet. Thus, VLAN
ID
numbers are freely reusable for all interfaces. In this example, devices ABC
and 456 are in their default VLAN associations as indicated in default association table 216.
By contrast, device XYZ is not in the default VLAN association for port 6.
Instead, its association connects it to VLAN 204. So, for this example, device XYZ may have been moved from the second wireless network back into range of an Access Point.
Figure 6 shows an example of mapping the core VLANs (e.g., 204, 206, 208, 210 of Figure 5) to logical interfaces 220, 222, 224, 226 on the router 122.
In this example, each logical interface 220, 222, 224 226 is configured to provide DHCP
relay; the DHCP server 124 uses the relay agent IP address (i.e., the giaddr field in the DHCP message body) to determine the appropriate IP subnet. Different sub-interfaces within the router 122, each corresponding to a different incoming VLAN, 220, 222, 224, 226 may be configured with different rules, e.g., for Internet access.
For example, administrative users may be assigned to a separate administrative VLAN with access to servers that are not available to general users. The DHCP
server may be modified to respond on a different VLAN, enabling the DHCP
server to control VLAN assignment on the core side of the FLAN switch.
So, for example, by including a tunnel endpoint between the Internet and a corporate FLAN, appropriately equipped wireless client devices can maintain a connection to the corporate FLAN, on campus and off. A notebook computer with both an 802.11 b interface and a GPRS interface can connect on-campus to the corporate 802.11b network and continue the connection through its GPRS device as it is taken off-campus. Conversely, the notebook computer can join the network off campus through its GPRS device and on-campus switch seamlessly to the 802.11b connection from the public network.
Similarly, a corporate Internet protocol (IP) based private branch exchange (PBX) may be extended for wireless stations by application of the present invention, e.g., for a wireless phone with both WLAN and 3G, GPRS or CDMA capability. A
call may be initiated within the PBX network on such a wireless phone and continued outside of the WLAN receiving area over the second network. Even outside of the WLAN receiving area, an apparent PBX call can be initiated over the second network and, as the caller returns to the WLAN receiving area, the call is continued and completed over the WLAN as an in network PBX call. In particular, using what is known as Wireless Mobility for Next Gen Networks (NGN) and more particularly a NGN voice over IP (VoIP) network, the NGN core includes a tunnel endpoint.
Thus, such an NGN core is capable of supporting connections from MSs from the second network.
Likewise, by providing a VoIP gateway and Internet connection in a single appliance, for example, the advantages of the present invention may be realized almost anywhere, e.g., in a private home. In particular, a home user can use a single, appropriately equipped cell phone both in-home and out, connecting cheaply over the Internet, when possible, and otherwise using precious cell phone minutes only as needed.
Advantageously, the present invention expands the reach of large free-form wireless data networks, i.e., FLANs that permit end-user mobility such as described in U.S. Patent Application No. 10/140,629 entitled "LOCAL AREA NETWORK WITH
WIRELESS CLIENT FREEDOM OF MOVEMENT" to Matthew G. Eglin, filed May 8, 2002, and assigned to the assignee of the present invention. By inclusion of a state of the art tunnel endpoint with the Eglin FLAN, clients can connect to FLANs established, e.g., in airports, coffee shops, dense urban areas, and aboard trains and buses; and without losing that connection leave and return to the original connection location. Further, the present invention extends free-form wireless access using industry-standard wireless communications technology, e.g., GSM, GPRS, 3G, 802.1 lb and 802.1 la. Combining available wireless access technologies, e.g., a laptop computer with cell phone capability or wireless modem and an 802.11b card, enables clients to connect to the FLAN using Internet Protocol (IP) without regard to location, whether at the office, at home or traveling across country by rail.
Thus, the present invention extends the FLAN, which provides a simple and easy to manage network where existing client devices can "turn on and go" moving freely, beyond FLAN AP reception areas. Further, if desired, authorization and accounting (AAA) as well as other wireless security features may be included just as with any other state of the art network.
The present invention provides all of these advantages with a layer-two Ethernet network to interconnect the wireless access points and an alternate network.
The usual scalability problems of such a network are avoided through a preferred application of IEEE 802.1Q Virtual LANs (VLANs) to effectively partition the network into many smaller networks, thus avoiding problems with broadcast traffic and spanning trees.
While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the appended claims.
packet on the core side of the FLAN switch 120 traveling to a mobile station, is assigned to a VLAN based on the mobile station's logical location in the network, or, equivalently, the mobile station's IP subnet.
Figure 4 is an example of VLAN configuration of an Ethernet aggregation switch 118 according to a preferred embodiment of the present invention.
Preferably, the FLAN switch 120 meshes through VLAN trunk interface 130 with the VLAN
configuration of Ethernet aggregation switches 118, the router 122 and the tunnel endpoint 312. In this example, APs 180 are grouped and each group 182, 184, 186 is connected through a hub 182h, 184h, if appropriate. Hubs 182h, 184h and individual APs (i.e. single AP groups 186) are connected to Ethernet aggregation switch ports 188, 190, 192. Each of these Ethernet switch ports 188, 190, 192 is mapped to an individual VLAN 194, 196, 198 on a VLAN trunk 200 connected to a FLAN access port. Each AP group 182, 184, 186 is mapped individually; there are no layer 2 connections between the AP groups 182, 184, 186 within the Ethernet aggregation switch 118.
Figure 5 shows an example of how a preferred FLAN switch 120, preprogrammed with default relationships, relates VLANs 194, 196, 198, 202, 204, 206, 208, 210 on access port 212 and core port 214 of the FLAN switch 120.
Default association table 216 provides default VLAN pairs as well as fixed core VLAN
assignment for the FLAN switch 120. Devices that access special networks or devices requiring fixed IP addresses are assigned by MAC address in association table 218. These relationships may be stored in clear text configuration files and modified using any suitable text editor.
In this example, the FLAN switch 120 is aware of three mobile stations with MAC addresses ABC, XYZ and 456, all at Port 6, as indicated in association table 218. The VLAN ID numbers (e.g., 1, 2, 3, 4, 21, 22, 23, 24) are unique, but a pordVLAN tuple identifies the source and destination of a packet. Thus, VLAN
ID
numbers are freely reusable for all interfaces. In this example, devices ABC
and 456 are in their default VLAN associations as indicated in default association table 216.
By contrast, device XYZ is not in the default VLAN association for port 6.
Instead, its association connects it to VLAN 204. So, for this example, device XYZ may have been moved from the second wireless network back into range of an Access Point.
Figure 6 shows an example of mapping the core VLANs (e.g., 204, 206, 208, 210 of Figure 5) to logical interfaces 220, 222, 224, 226 on the router 122.
In this example, each logical interface 220, 222, 224 226 is configured to provide DHCP
relay; the DHCP server 124 uses the relay agent IP address (i.e., the giaddr field in the DHCP message body) to determine the appropriate IP subnet. Different sub-interfaces within the router 122, each corresponding to a different incoming VLAN, 220, 222, 224, 226 may be configured with different rules, e.g., for Internet access.
For example, administrative users may be assigned to a separate administrative VLAN with access to servers that are not available to general users. The DHCP
server may be modified to respond on a different VLAN, enabling the DHCP
server to control VLAN assignment on the core side of the FLAN switch.
So, for example, by including a tunnel endpoint between the Internet and a corporate FLAN, appropriately equipped wireless client devices can maintain a connection to the corporate FLAN, on campus and off. A notebook computer with both an 802.11 b interface and a GPRS interface can connect on-campus to the corporate 802.11b network and continue the connection through its GPRS device as it is taken off-campus. Conversely, the notebook computer can join the network off campus through its GPRS device and on-campus switch seamlessly to the 802.11b connection from the public network.
Similarly, a corporate Internet protocol (IP) based private branch exchange (PBX) may be extended for wireless stations by application of the present invention, e.g., for a wireless phone with both WLAN and 3G, GPRS or CDMA capability. A
call may be initiated within the PBX network on such a wireless phone and continued outside of the WLAN receiving area over the second network. Even outside of the WLAN receiving area, an apparent PBX call can be initiated over the second network and, as the caller returns to the WLAN receiving area, the call is continued and completed over the WLAN as an in network PBX call. In particular, using what is known as Wireless Mobility for Next Gen Networks (NGN) and more particularly a NGN voice over IP (VoIP) network, the NGN core includes a tunnel endpoint.
Thus, such an NGN core is capable of supporting connections from MSs from the second network.
Likewise, by providing a VoIP gateway and Internet connection in a single appliance, for example, the advantages of the present invention may be realized almost anywhere, e.g., in a private home. In particular, a home user can use a single, appropriately equipped cell phone both in-home and out, connecting cheaply over the Internet, when possible, and otherwise using precious cell phone minutes only as needed.
Advantageously, the present invention expands the reach of large free-form wireless data networks, i.e., FLANs that permit end-user mobility such as described in U.S. Patent Application No. 10/140,629 entitled "LOCAL AREA NETWORK WITH
WIRELESS CLIENT FREEDOM OF MOVEMENT" to Matthew G. Eglin, filed May 8, 2002, and assigned to the assignee of the present invention. By inclusion of a state of the art tunnel endpoint with the Eglin FLAN, clients can connect to FLANs established, e.g., in airports, coffee shops, dense urban areas, and aboard trains and buses; and without losing that connection leave and return to the original connection location. Further, the present invention extends free-form wireless access using industry-standard wireless communications technology, e.g., GSM, GPRS, 3G, 802.1 lb and 802.1 la. Combining available wireless access technologies, e.g., a laptop computer with cell phone capability or wireless modem and an 802.11b card, enables clients to connect to the FLAN using Internet Protocol (IP) without regard to location, whether at the office, at home or traveling across country by rail.
Thus, the present invention extends the FLAN, which provides a simple and easy to manage network where existing client devices can "turn on and go" moving freely, beyond FLAN AP reception areas. Further, if desired, authorization and accounting (AAA) as well as other wireless security features may be included just as with any other state of the art network.
The present invention provides all of these advantages with a layer-two Ethernet network to interconnect the wireless access points and an alternate network.
The usual scalability problems of such a network are avoided through a preferred application of IEEE 802.1Q Virtual LANs (VLANs) to effectively partition the network into many smaller networks, thus avoiding problems with broadcast traffic and spanning trees.
While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the appended claims.
Claims (24)
1. A network with wireless access capability comprising:
a plurality of wireless access points with a first communications protocol;
at least one Ethernet aggregation switch, one of said plurality of access points being connected to said at least one Ethernet aggregation switch, said at least one Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from said connected access points with access VLANs;
a free-form virtual network switch with a plurality of VLAN trunk interface ports, said at least one Ethernet aggregation switch connected to one of said plurality of VLAN trunk interface ports, client traffic passing between said access VLANs at each said connected Ethernet aggregation switch and appropriate core VLANs, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and at least one tunnel endpoint connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging an other wireless network to said free-form virtual network switch, said other wireless network having a second communications protocol different than said first communications protocol, wherein client wireless devices having contact with said other wireless network selectively connect to said free-form virtual network switch through said tunnel endpoint whenever said plurality of wireless access points are unavailable.
a plurality of wireless access points with a first communications protocol;
at least one Ethernet aggregation switch, one of said plurality of access points being connected to said at least one Ethernet aggregation switch, said at least one Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from said connected access points with access VLANs;
a free-form virtual network switch with a plurality of VLAN trunk interface ports, said at least one Ethernet aggregation switch connected to one of said plurality of VLAN trunk interface ports, client traffic passing between said access VLANs at each said connected Ethernet aggregation switch and appropriate core VLANs, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and at least one tunnel endpoint connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging an other wireless network to said free-form virtual network switch, said other wireless network having a second communications protocol different than said first communications protocol, wherein client wireless devices having contact with said other wireless network selectively connect to said free-form virtual network switch through said tunnel endpoint whenever said plurality of wireless access points are unavailable.
2. A network as in claim 1, wherein both the other wireless network and said at least one tunnel endpoint are connected to another network, traffic between said other wireless network and said at least one tunnel endpoint passing through said other network, and at least one mobile station having at least two independent wireless communication capabilities for said first communications protocol and said second communications protocol, wherein said at least one mobile station is wirelessly connectable to said plurality of access points as a client wireless device and connectable to said other wireless network, said at least one mobile station communicating with said network through an available one of said plurality of access points and automatically switching connection to said other wireless network when none of said plurality of access points are available.
3. A network as in claim 2 wherein said other network is the Internet and when connection to said at least one mobile station is switched to said other wireless network, said at least one mobile station tunnels network packets identified for said mobile station across said other wireless network to said at least one tunnel endpoint.
4. A network as in claim 2 wherein when connection to said at least one mobile station is switched to said other wireless network, said at least one mobile station maintains a layer 2 tunnel carrying Ethernet packets across said other wireless network to said at least one tunnel endpoint, said Ethernet packets containing a MAC and IP addresses of a WLAN
interface in said at least one mobile station, whereby connection to the network is seamlessly maintained.
interface in said at least one mobile station, whereby connection to the network is seamlessly maintained.
5. A network as in claim 4 wherein said other network is a private network and when said at least one tunnel endpoint terminates said layer 2 tunnel passing Ethernet frames from said client wireless devices over said one VLAN
trunk interface port to said free-form virtual network switch and is a proxy for said MAC address.
trunk interface port to said free-form virtual network switch and is a proxy for said MAC address.
6. A network as in claim 1 wherein as said client wireless devices move between reception areas and switch connection between said access points and said other wireless network, said free-form virtual network switch identifies each switch and updates an association table for said each said switch.
7. A network as in claim 1 further comprising:
a router connected to a core VLAN at another one of said plurality of VLAN trunk interface ports and routing traffic on said core VLANs between said free-form virtual network switch and a public network;
a dynamic host configuration protocol (DHCP) server managing connection between said free-form virtual network switch and said public network; and a gateway providing access control, network address translation and firewall security at said public network.
a router connected to a core VLAN at another one of said plurality of VLAN trunk interface ports and routing traffic on said core VLANs between said free-form virtual network switch and a public network;
a dynamic host configuration protocol (DHCP) server managing connection between said free-form virtual network switch and said public network; and a gateway providing access control, network address translation and firewall security at said public network.
8. A network as in claim 1 wherein at least two of said access points are connected to a hub forming an access point group, said hub connecting said access point group to said Ethernet aggregation switch.
9. A network as in claim 2 wherein said first communications protocol is a wireless Ethernet protocol and said second communications protocol is a cell phone network protocol.
10. A network as in claim 9 wherein said at least one mobile station comprises:
a wireless LAN interface, wirelessly communicating with available ones of said plurality of access points; and a cell phone selectively communicating with said other wireless network, said at least one mobile station seamlessly maintaining connection to said network.
a wireless LAN interface, wirelessly communicating with available ones of said plurality of access points; and a cell phone selectively communicating with said other wireless network, said at least one mobile station seamlessly maintaining connection to said network.
11. A network as in claim 10 wherein said wireless LAN
interface monitors access point carrier signals and provides an indication of the presence/absence of said access point carrier signals, said client wireless devices connected to said free-form virtual network switch through said tunnel endpoint, reconnecting to one of said plurality of access points whenever an access point carrier signal is present.
interface monitors access point carrier signals and provides an indication of the presence/absence of said access point carrier signals, said client wireless devices connected to said free-form virtual network switch through said tunnel endpoint, reconnecting to one of said plurality of access points whenever an access point carrier signal is present.
12. A network as in claim 10 wherein said network is a private branch exchange network (PBX) and said wireless LAN
interface is a voice over Internet protocol (VoIP) interface.
interface is a voice over Internet protocol (VoIP) interface.
13. A network as in claim 1 wherein said other wireless network is one of a plurality of other wireless protocol networks bridged to said network through said tunnel endpoint.
14. A network with wireless access capability comprising:
a plurality of wireless access points with a first communications protocol;
a plurality of mobile stations wirelessly connectable to said plurality of access points, at least one mobile station connectable to at least one other wireless network each having a communications protocol different than said first communications protocol;
Ethernet aggregation means for connecting one of said plurality of access points to said network, said Ethernet aggregation means being virtual LAN (VLAN) aware and matching client traffic from said plurality of access points with access VLANs;
free-form virtual network switching means for switching client traffic between said access VLANs at said Ethernet aggregation means to appropriate core VLANs, said free-form virtual network switching means having a plurality of VLAN trunk interface ports, each said Ethernet aggregation means connected to one of said plurality of VLAN
trunk interface ports, the free-form virtual network switching means comprises:
means for maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and tunnel endpoint means for terminating Ethernet packets tunnelling over other wireless networks and providing terminated said Ethernet packets as client traffic to said free-form virtual network switching means, said tunnel endpoint means connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging said free-form virtual network switching means to said other wireless networks and providing a MAC address proxy for connected ones of said at least one mobile station, said free-form virtual network switching means switching client traffic from said tunnel endpoint means to appropriate core VLANs whenever said plurality of wireless access points are unavailable.
a plurality of wireless access points with a first communications protocol;
a plurality of mobile stations wirelessly connectable to said plurality of access points, at least one mobile station connectable to at least one other wireless network each having a communications protocol different than said first communications protocol;
Ethernet aggregation means for connecting one of said plurality of access points to said network, said Ethernet aggregation means being virtual LAN (VLAN) aware and matching client traffic from said plurality of access points with access VLANs;
free-form virtual network switching means for switching client traffic between said access VLANs at said Ethernet aggregation means to appropriate core VLANs, said free-form virtual network switching means having a plurality of VLAN trunk interface ports, each said Ethernet aggregation means connected to one of said plurality of VLAN
trunk interface ports, the free-form virtual network switching means comprises:
means for maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and tunnel endpoint means for terminating Ethernet packets tunnelling over other wireless networks and providing terminated said Ethernet packets as client traffic to said free-form virtual network switching means, said tunnel endpoint means connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging said free-form virtual network switching means to said other wireless networks and providing a MAC address proxy for connected ones of said at least one mobile station, said free-form virtual network switching means switching client traffic from said tunnel endpoint means to appropriate core VLANs whenever said plurality of wireless access points are unavailable.
15. A network as in claim 14, wherein said at least one mobile station comprises:
first communications protocol means for wirelessly communicating with said network through an available one of said plurality of access points;
second communications protocol means for wirelessly communicating with one said at least one other wireless network;
means for automatically switching to one of said other wireless networks when none of said plurality of access points are available; and means for automatically reconnecting to one of said plurality of access points whenever one is available, said at least one mobile station seamlessly maintaining connection to said network.
first communications protocol means for wirelessly communicating with said network through an available one of said plurality of access points;
second communications protocol means for wirelessly communicating with one said at least one other wireless network;
means for automatically switching to one of said other wireless networks when none of said plurality of access points are available; and means for automatically reconnecting to one of said plurality of access points whenever one is available, said at least one mobile station seamlessly maintaining connection to said network.
16. A network as in claim 14, wherein both the other wireless network and said tunnel endpoint means are connected to another network, traffic between said other wireless network and said tunnel endpoint means passing through said other network.
17. A network as in claim 15 wherein said other network is a private network and said at least one mobile station further comprises:
tunnelling means for tunnelling network packets identified for said mobile station across said one of the other wireless networks and said private network to said tunnel endpoint.
tunnelling means for tunnelling network packets identified for said mobile station across said one of the other wireless networks and said private network to said tunnel endpoint.
18. A network as in claim 14, wherein said other network is the Internet and said at least one mobile station comprises:
means for maintaining a layer 2 tunnel carrying Ethernet packets across said other wireless network and the Internet between said tunnel endpoint and said at least one mobile station, said Ethernet packets containing a MAC and IP addresses of a first communications protocol interface in said at least one mobile station, said mobile station seamlessly maintaining an FLAN connection.
means for maintaining a layer 2 tunnel carrying Ethernet packets across said other wireless network and the Internet between said tunnel endpoint and said at least one mobile station, said Ethernet packets containing a MAC and IP addresses of a first communications protocol interface in said at least one mobile station, said mobile station seamlessly maintaining an FLAN connection.
19. A network as in claim 14, wherein said free-form virtual network switching means comprises:
means for identifying each switch between reception areas and switching between said access points and each of said other wireless networks; and means for updating an association table responsive to said each said switch.
means for identifying each switch between reception areas and switching between said access points and each of said other wireless networks; and means for updating an association table responsive to said each said switch.
20. A network as in claim 14 further comprising:
traffic routing means for routing core VLAN
traffic between said virtual network switch and a public network, said traffic routing means connected to a core VLAN
at another one of said plurality of VLAN trunk interface ports;
dynamic host configuration protocol (DHCP) server means for managing connection between said free-form virtual network switch and said public network; and means for providing access control, network address translation and firewall security at said public network.
traffic routing means for routing core VLAN
traffic between said virtual network switch and a public network, said traffic routing means connected to a core VLAN
at another one of said plurality of VLAN trunk interface ports;
dynamic host configuration protocol (DHCP) server means for managing connection between said free-form virtual network switch and said public network; and means for providing access control, network address translation and firewall security at said public network.
21. A network as in claim 14 further comprising:
access point grouping means for grouping at least two of said access points into an access point group and connecting said access point group to said Ethernet aggregation means.
access point grouping means for grouping at least two of said access points into an access point group and connecting said access point group to said Ethernet aggregation means.
22. A network as in claim 14 wherein said second communications protocol means comprises cell phone communications means for communicating with a cell phone network.
23. A network as in claim 22 wherein said network is a private branch exchange network.
24. A network with wireless access capability comprising:
a plurality of wireless Ethernet access points;
at least one Ethernet aggregation switch, ones of said plurality of access points being connected to each said at least one Ethernet aggregation switch, said at least one Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from connected said access points with access VLANs;
a free-form virtual network switch passing client traffic between said access VLANs at said at least one connected Ethernet aggregation switch and appropriate core VLANs, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and at least one tunnel endpoint bridging a cell phone network to said free-form virtual network switch, wherein client wireless Ethernet devices having contact with said cell phone network seamlessly connect to said free-form virtual network switch through said cell phone network to said tunnel endpoint whenever said plurality of wireless Ethernet access points are unavailable.
a plurality of wireless Ethernet access points;
at least one Ethernet aggregation switch, ones of said plurality of access points being connected to each said at least one Ethernet aggregation switch, said at least one Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from connected said access points with access VLANs;
a free-form virtual network switch passing client traffic between said access VLANs at said at least one connected Ethernet aggregation switch and appropriate core VLANs, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports; and at least one tunnel endpoint bridging a cell phone network to said free-form virtual network switch, wherein client wireless Ethernet devices having contact with said cell phone network seamlessly connect to said free-form virtual network switch through said cell phone network to said tunnel endpoint whenever said plurality of wireless Ethernet access points are unavailable.
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Families Citing this family (148)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7319682B2 (en) * | 2002-01-07 | 2008-01-15 | Hewlett-Packard Development Company, L.P. | Methods and apparatus for selecting a wireless local area network port and establishing communication therewith |
US20040081144A1 (en) * | 2002-09-17 | 2004-04-29 | Richard Martin | System and method for access point (AP) aggregation and resiliency in a hybrid wired/wireless local area network |
US7337224B1 (en) * | 2002-10-24 | 2008-02-26 | Cisco Technology, Inc. | Method and apparatus providing policy-based determination of network addresses |
EP1573999A1 (en) * | 2002-12-13 | 2005-09-14 | Cetacea Networks Corporation | Network bandwidth anomaly detector apparatus and method for detectecting network attacks using correlation function |
US7912065B2 (en) * | 2002-12-31 | 2011-03-22 | Alcatel-Lucent Usa Inc. | Automated voice over IP device VLAN-association setup |
US20040252722A1 (en) * | 2003-06-13 | 2004-12-16 | Samsung Electronics Co., Ltd. | Apparatus and method for implementing VLAN bridging and a VPN in a distributed architecture router |
US20050059406A1 (en) * | 2003-09-17 | 2005-03-17 | Trapeze Networks, Inc. | Wireless LAN measurement feedback |
US7142852B2 (en) * | 2003-11-13 | 2006-11-28 | Motorola, Inc. | Method and gateway for controlling call routing |
US20050141567A1 (en) * | 2003-12-29 | 2005-06-30 | Abed Jaber | Extending Ethernet-over-SONET to provide point-to-multipoint service |
US7221927B2 (en) * | 2004-02-13 | 2007-05-22 | Trapeze Networks, Inc. | Station mobility between access points |
EP1730882A2 (en) * | 2004-03-17 | 2006-12-13 | Telefonaktiebolaget LM Ericsson (publ) | Vlan mapping for multi-service provisioning |
US20070274321A1 (en) * | 2004-03-17 | 2007-11-29 | Jonsson Ulf F | Vlan Mapping For Multi-Service Provisioning |
US7801123B2 (en) * | 2004-04-16 | 2010-09-21 | Alcatel Lucent | Method and system configured for facilitating residential broadband service |
US7639656B2 (en) * | 2004-04-28 | 2009-12-29 | Symbol Technologies, Inc. | Protocol for communication between access ports and wireless switches |
KR100667348B1 (en) | 2004-05-07 | 2007-01-10 | 주식회사 케이티프리텔 | Method and apparatus for providing wireless Internet service with Wi-Fi |
US7720031B1 (en) * | 2004-10-15 | 2010-05-18 | Cisco Technology, Inc. | Methods and devices to support mobility of a client across VLANs and subnets, while preserving the client's assigned IP address |
US8065712B1 (en) | 2005-02-16 | 2011-11-22 | Cisco Technology, Inc. | Methods and devices for qualifying a client machine to access a network |
US8316434B2 (en) | 2005-02-23 | 2012-11-20 | At&T Intellectual Property I, L.P. | Centralized access control system and methods for distributed broadband access points |
EP1701515A1 (en) * | 2005-03-08 | 2006-09-13 | Alcatel | System and method for translation of Virtual LAN Identifiers |
US20060203743A1 (en) * | 2005-03-10 | 2006-09-14 | Quinn Liam B | Apparatus and methods for dynamically configurable wireless network |
US7529925B2 (en) | 2005-03-15 | 2009-05-05 | Trapeze Networks, Inc. | System and method for distributing keys in a wireless network |
US7551574B1 (en) * | 2005-03-31 | 2009-06-23 | Trapeze Networks, Inc. | Method and apparatus for controlling wireless network access privileges based on wireless client location |
US20060245393A1 (en) * | 2005-04-27 | 2006-11-02 | Symbol Technologies, Inc. | Method, system and apparatus for layer 3 roaming in wireless local area networks (WLANs) |
US7443809B2 (en) * | 2005-04-27 | 2008-10-28 | Symbol Technologies, Inc. | Method, system and apparatus for creating a mesh network of wireless switches to support layer 3 roaming in wireless local area networks (WLANs) |
US7515573B2 (en) * | 2005-04-27 | 2009-04-07 | Symbol Technologies, Inc. | Method, system and apparatus for creating an active client list to support layer 3 roaming in wireless local area networks (WLANS) |
US7529203B2 (en) * | 2005-05-26 | 2009-05-05 | Symbol Technologies, Inc. | Method, system and apparatus for load balancing of wireless switches to support layer 3 roaming in wireless local area networks (WLANs) |
US20060268834A1 (en) * | 2005-05-26 | 2006-11-30 | Symbol Technologies, Inc. | Method, system and wireless router apparatus supporting multiple subnets for layer 3 roaming in wireless local area networks (WLANs) |
US20070002833A1 (en) * | 2005-06-30 | 2007-01-04 | Symbol Technologies, Inc. | Method, system and apparatus for assigning and managing IP addresses for wireless clients in wireless local area networks (WLANs) |
WO2007044986A2 (en) | 2005-10-13 | 2007-04-19 | Trapeze Networks, Inc. | System and method for remote monitoring in a wireless network |
US7724703B2 (en) | 2005-10-13 | 2010-05-25 | Belden, Inc. | System and method for wireless network monitoring |
US7551619B2 (en) * | 2005-10-13 | 2009-06-23 | Trapeze Networks, Inc. | Identity-based networking |
US7573859B2 (en) | 2005-10-13 | 2009-08-11 | Trapeze Networks, Inc. | System and method for remote monitoring in a wireless network |
US8638762B2 (en) | 2005-10-13 | 2014-01-28 | Trapeze Networks, Inc. | System and method for network integrity |
US20070106998A1 (en) * | 2005-10-27 | 2007-05-10 | Zeldin Paul E | Mobility system and method for messaging and inter-process communication |
US8250587B2 (en) * | 2005-10-27 | 2012-08-21 | Trapeze Networks, Inc. | Non-persistent and persistent information setting method and system for inter-process communication |
US8745253B2 (en) * | 2006-03-08 | 2014-06-03 | Alcatel Lucent | Triggering DHCP actions from IEEE 802.1x state changes |
US20070260720A1 (en) * | 2006-05-03 | 2007-11-08 | Morain Gary E | Mobility domain |
US7558266B2 (en) | 2006-05-03 | 2009-07-07 | Trapeze Networks, Inc. | System and method for restricting network access using forwarding databases |
US7953089B1 (en) * | 2006-05-16 | 2011-05-31 | Cisco Technology, Inc. | Systems and methods for multicast switching in a private VLAN |
US8966018B2 (en) | 2006-05-19 | 2015-02-24 | Trapeze Networks, Inc. | Automated network device configuration and network deployment |
US7577453B2 (en) * | 2006-06-01 | 2009-08-18 | Trapeze Networks, Inc. | Wireless load balancing across bands |
US20100165993A1 (en) * | 2006-06-09 | 2010-07-01 | Henrik Basilier | Operator Managed Virtual Home Network |
US7912982B2 (en) * | 2006-06-09 | 2011-03-22 | Trapeze Networks, Inc. | Wireless routing selection system and method |
US9258702B2 (en) | 2006-06-09 | 2016-02-09 | Trapeze Networks, Inc. | AP-local dynamic switching |
US9191799B2 (en) | 2006-06-09 | 2015-11-17 | Juniper Networks, Inc. | Sharing data between wireless switches system and method |
US8818322B2 (en) | 2006-06-09 | 2014-08-26 | Trapeze Networks, Inc. | Untethered access point mesh system and method |
US20080002607A1 (en) * | 2006-06-30 | 2008-01-03 | Ramakrishnan Nagarajan | Technique for handling layer 2 roaming in a network of wireless switches supporting layer 3 mobility within a mobility domain |
US7804806B2 (en) * | 2006-06-30 | 2010-09-28 | Symbol Technologies, Inc. | Techniques for peer wireless switch discovery within a mobility domain |
US20080008128A1 (en) * | 2006-07-07 | 2008-01-10 | Symbol Technologies, Inc. | Techniques for resolving wireless client device layer 3 mobility state conflicts between wireless switches within a mobility domain |
US7826869B2 (en) * | 2006-07-07 | 2010-11-02 | Symbol Technologies, Inc. | Mobility relay techniques for reducing layer 3 mobility control traffic and peering sessions to provide scalability in large wireless switch networks |
US7961690B2 (en) * | 2006-07-07 | 2011-06-14 | Symbol Technologies, Inc. | Wireless switch network architecture implementing mobility areas within a mobility domain |
US7724704B2 (en) * | 2006-07-17 | 2010-05-25 | Beiden Inc. | Wireless VLAN system and method |
US20080020758A1 (en) * | 2006-07-20 | 2008-01-24 | Symbol Technologies, Inc. | Query-response techniques for reduction of wireless client database size to provide scalability in large wireless switch networks supporting layer 3 mobility |
US7639648B2 (en) * | 2006-07-20 | 2009-12-29 | Symbol Technologies, Inc. | Techniques for home wireless switch redundancy and stateful switchover in a network of wireless switches supporting layer 3 mobility within a mobility domain |
US7613150B2 (en) * | 2006-07-20 | 2009-11-03 | Symbol Technologies, Inc. | Hitless restart mechanism for non-stop data-forwarding in the event of L3-mobility control-plane failure in a wireless switch |
US8340110B2 (en) | 2006-09-15 | 2012-12-25 | Trapeze Networks, Inc. | Quality of service provisioning for wireless networks |
US8072952B2 (en) * | 2006-10-16 | 2011-12-06 | Juniper Networks, Inc. | Load balancing |
EP2090039A1 (en) | 2006-10-31 | 2009-08-19 | British Telecommunications Public Limited Company | In-layer ethernet p-cycle protection scheme |
US20080107077A1 (en) * | 2006-11-03 | 2008-05-08 | James Murphy | Subnet mobility supporting wireless handoff |
US20080151844A1 (en) * | 2006-12-20 | 2008-06-26 | Manish Tiwari | Wireless access point authentication system and method |
US7873061B2 (en) | 2006-12-28 | 2011-01-18 | Trapeze Networks, Inc. | System and method for aggregation and queuing in a wireless network |
WO2008083339A2 (en) * | 2006-12-28 | 2008-07-10 | Trapeze Networks, Inc. | Application-aware wireless network system and method |
US8973098B2 (en) * | 2007-01-11 | 2015-03-03 | International Business Machines Corporation | System and method for virtualized resource configuration |
US8184631B2 (en) * | 2007-01-22 | 2012-05-22 | Oracle America, Inc. | Method for specifying a MAC identifier for a network-interface-device |
FR2917258B1 (en) * | 2007-06-06 | 2010-02-26 | Alcatel Lucent | DEVICE AND METHOD FOR TELECOMMUNICATION BETWEEN A USER TERMINAL AND A NETWORK SERVER |
US7885233B2 (en) * | 2007-07-31 | 2011-02-08 | Symbol Technologies, Inc. | Forwarding broadcast/multicast data when wireless clients layer 3 roam across IP subnets in a WLAN |
US20110004913A1 (en) * | 2007-07-31 | 2011-01-06 | Symbol Technologies, Inc. | Architecture for seamless enforcement of security policies when roaming across ip subnets in ieee 802.11 wireless networks |
US8902904B2 (en) | 2007-09-07 | 2014-12-02 | Trapeze Networks, Inc. | Network assignment based on priority |
US8509128B2 (en) * | 2007-09-18 | 2013-08-13 | Trapeze Networks, Inc. | High level instruction convergence function |
US8238942B2 (en) | 2007-11-21 | 2012-08-07 | Trapeze Networks, Inc. | Wireless station location detection |
US8150357B2 (en) | 2008-03-28 | 2012-04-03 | Trapeze Networks, Inc. | Smoothing filter for irregular update intervals |
US8675630B2 (en) * | 2008-05-22 | 2014-03-18 | Qualcomm Incorporated | Systems and methods for multiplexing multiple connections in mobile IP network |
US8474023B2 (en) | 2008-05-30 | 2013-06-25 | Juniper Networks, Inc. | Proactive credential caching |
US8548428B2 (en) | 2009-01-28 | 2013-10-01 | Headwater Partners I Llc | Device group partitions and settlement platform |
US8402111B2 (en) | 2009-01-28 | 2013-03-19 | Headwater Partners I, Llc | Device assisted services install |
US8583781B2 (en) | 2009-01-28 | 2013-11-12 | Headwater Partners I Llc | Simplified service network architecture |
US8626115B2 (en) | 2009-01-28 | 2014-01-07 | Headwater Partners I Llc | Wireless network service interfaces |
US8346225B2 (en) | 2009-01-28 | 2013-01-01 | Headwater Partners I, Llc | Quality of service for device assisted services |
US8275830B2 (en) | 2009-01-28 | 2012-09-25 | Headwater Partners I Llc | Device assisted CDR creation, aggregation, mediation and billing |
US8832777B2 (en) | 2009-03-02 | 2014-09-09 | Headwater Partners I Llc | Adapting network policies based on device service processor configuration |
US8589541B2 (en) | 2009-01-28 | 2013-11-19 | Headwater Partners I Llc | Device-assisted services for protecting network capacity |
US8406748B2 (en) | 2009-01-28 | 2013-03-26 | Headwater Partners I Llc | Adaptive ambient services |
US8635335B2 (en) | 2009-01-28 | 2014-01-21 | Headwater Partners I Llc | System and method for wireless network offloading |
US9009310B1 (en) * | 2008-06-12 | 2015-04-14 | Hlt Domestic Ip Llc | System and method for provisioning of internet access services in a guest facility |
US8978105B2 (en) * | 2008-07-25 | 2015-03-10 | Trapeze Networks, Inc. | Affirming network relationships and resource access via related networks |
US8036161B2 (en) * | 2008-07-30 | 2011-10-11 | Symbol Technologies, Inc. | Wireless switch with virtual wireless switch modules |
US8238298B2 (en) | 2008-08-29 | 2012-08-07 | Trapeze Networks, Inc. | Picking an optimal channel for an access point in a wireless network |
US10057775B2 (en) | 2009-01-28 | 2018-08-21 | Headwater Research Llc | Virtualized policy and charging system |
US9572019B2 (en) | 2009-01-28 | 2017-02-14 | Headwater Partners LLC | Service selection set published to device agent with on-device service selection |
US9578182B2 (en) | 2009-01-28 | 2017-02-21 | Headwater Partners I Llc | Mobile device and service management |
US10783581B2 (en) | 2009-01-28 | 2020-09-22 | Headwater Research Llc | Wireless end-user device providing ambient or sponsored services |
US9571559B2 (en) | 2009-01-28 | 2017-02-14 | Headwater Partners I Llc | Enhanced curfew and protection associated with a device group |
US9706061B2 (en) | 2009-01-28 | 2017-07-11 | Headwater Partners I Llc | Service design center for device assisted services |
US10798252B2 (en) | 2009-01-28 | 2020-10-06 | Headwater Research Llc | System and method for providing user notifications |
US11218854B2 (en) | 2009-01-28 | 2022-01-04 | Headwater Research Llc | Service plan design, user interfaces, application programming interfaces, and device management |
US10248996B2 (en) | 2009-01-28 | 2019-04-02 | Headwater Research Llc | Method for operating a wireless end-user device mobile payment agent |
US9980146B2 (en) | 2009-01-28 | 2018-05-22 | Headwater Research Llc | Communications device with secure data path processing agents |
US10779177B2 (en) | 2009-01-28 | 2020-09-15 | Headwater Research Llc | Device group partitions and settlement platform |
US9270559B2 (en) | 2009-01-28 | 2016-02-23 | Headwater Partners I Llc | Service policy implementation for an end-user device having a control application or a proxy agent for routing an application traffic flow |
US10492102B2 (en) | 2009-01-28 | 2019-11-26 | Headwater Research Llc | Intermediate networking devices |
US10237757B2 (en) | 2009-01-28 | 2019-03-19 | Headwater Research Llc | System and method for wireless network offloading |
US10200541B2 (en) | 2009-01-28 | 2019-02-05 | Headwater Research Llc | Wireless end-user device with divided user space/kernel space traffic policy system |
US9955332B2 (en) | 2009-01-28 | 2018-04-24 | Headwater Research Llc | Method for child wireless device activation to subscriber account of a master wireless device |
US9609510B2 (en) | 2009-01-28 | 2017-03-28 | Headwater Research Llc | Automated credential porting for mobile devices |
US9954975B2 (en) | 2009-01-28 | 2018-04-24 | Headwater Research Llc | Enhanced curfew and protection associated with a device group |
US10484858B2 (en) | 2009-01-28 | 2019-11-19 | Headwater Research Llc | Enhanced roaming services and converged carrier networks with device assisted services and a proxy |
US9858559B2 (en) | 2009-01-28 | 2018-01-02 | Headwater Research Llc | Network service plan design |
US9647918B2 (en) | 2009-01-28 | 2017-05-09 | Headwater Research Llc | Mobile device and method attributing media services network usage to requesting application |
US8745191B2 (en) | 2009-01-28 | 2014-06-03 | Headwater Partners I Llc | System and method for providing user notifications |
US9755842B2 (en) | 2009-01-28 | 2017-09-05 | Headwater Research Llc | Managing service user discovery and service launch object placement on a device |
US10264138B2 (en) | 2009-01-28 | 2019-04-16 | Headwater Research Llc | Mobile device and service management |
US10326800B2 (en) | 2009-01-28 | 2019-06-18 | Headwater Research Llc | Wireless network service interfaces |
US9392462B2 (en) | 2009-01-28 | 2016-07-12 | Headwater Partners I Llc | Mobile end-user device with agent limiting wireless data communication for specified background applications based on a stored policy |
US9351193B2 (en) * | 2009-01-28 | 2016-05-24 | Headwater Partners I Llc | Intermediate networking devices |
US9565707B2 (en) | 2009-01-28 | 2017-02-07 | Headwater Partners I Llc | Wireless end-user device with wireless data attribution to multiple personas |
US9557889B2 (en) | 2009-01-28 | 2017-01-31 | Headwater Partners I Llc | Service plan design, user interfaces, application programming interfaces, and device management |
US10064055B2 (en) | 2009-01-28 | 2018-08-28 | Headwater Research Llc | Security, fraud detection, and fraud mitigation in device-assisted services systems |
US10715342B2 (en) | 2009-01-28 | 2020-07-14 | Headwater Research Llc | Managing service user discovery and service launch object placement on a device |
US8793758B2 (en) | 2009-01-28 | 2014-07-29 | Headwater Partners I Llc | Security, fraud detection, and fraud mitigation in device-assisted services systems |
US10841839B2 (en) | 2009-01-28 | 2020-11-17 | Headwater Research Llc | Security, fraud detection, and fraud mitigation in device-assisted services systems |
US10270622B2 (en) * | 2009-05-14 | 2019-04-23 | Avaya Inc. | Method for enabling mobility of client devices in large scale unified networks |
US8804732B1 (en) * | 2010-01-29 | 2014-08-12 | Trapeze Networks, Inc. | Methods and apparatus for separate control and data planes in a wireless network |
US8885475B2 (en) * | 2010-09-10 | 2014-11-11 | Fujitsu Limited | Method and system for virtualized forwarding |
US8542836B2 (en) | 2010-12-01 | 2013-09-24 | Juniper Networks, Inc. | System, apparatus and methods for highly scalable continuous roaming within a wireless network |
US8958298B2 (en) | 2011-08-17 | 2015-02-17 | Nicira, Inc. | Centralized logical L3 routing |
US9160633B1 (en) * | 2011-10-07 | 2015-10-13 | Adtran, Inc. | Systems and methods for dynamically learning virtual local area network (VLAN) tags |
CN102546350B (en) * | 2012-02-10 | 2014-12-10 | 浙江宇视科技有限公司 | Method and device for saving WAN (wide area network) bandwidth in IP (internet protocol) monitoring system |
CN104205753B (en) * | 2012-03-19 | 2017-10-03 | 英特尔公司 | Technology for the grouping management in input/output virtualization system |
CN102694711B (en) * | 2012-05-03 | 2015-02-11 | 浙江宇视科技有限公司 | Wide area network bandwidth saving method and device in IP monitoring system |
US20140081659A1 (en) | 2012-09-17 | 2014-03-20 | Depuy Orthopaedics, Inc. | Systems and methods for surgical and interventional planning, support, post-operative follow-up, and functional recovery tracking |
US9515947B1 (en) * | 2013-03-15 | 2016-12-06 | EMC IP Holding Company LLC | Method and system for providing a virtual network-aware storage array |
CN103476023B (en) * | 2013-09-11 | 2016-08-24 | 福建星网锐捷网络有限公司 | The collocation method of access point apparatus, access controller and communication system |
US9648633B2 (en) | 2013-12-23 | 2017-05-09 | Apple Inc. | Virtual WLAN interface for cellular data offloading in a wireless device |
CN104796970A (en) * | 2014-01-17 | 2015-07-22 | 四川平安都市通讯科技有限公司 | Method for data transmission during large-range movement of terminal |
US9712489B2 (en) | 2014-07-29 | 2017-07-18 | Aruba Networks, Inc. | Client device address assignment following authentication |
CN105592483B (en) * | 2015-08-20 | 2020-02-11 | 新华三技术有限公司 | Method and device for transmitting configuration information |
JPWO2017159258A1 (en) * | 2016-03-15 | 2019-01-24 | パナソニックIpマネジメント株式会社 | Information processing apparatus and environment setting method |
US11176595B2 (en) | 2016-05-24 | 2021-11-16 | Level 3 Communications, Llc | Systems and methods for staging customer premise equipment of a telecommunications network |
CN106102074A (en) * | 2016-08-11 | 2016-11-09 | 山东奥联信息科技有限公司 | Express highway all-way is wireless WIFI covering system |
CN106255140B (en) * | 2016-08-29 | 2019-11-15 | 京信通信系统(中国)有限公司 | A kind of novel base station extended pattern monitoring system and its monitoring method |
JP2018061201A (en) | 2016-10-07 | 2018-04-12 | 株式会社リコー | Communication controller, communication control program, and network communication system |
US10917803B2 (en) * | 2017-06-12 | 2021-02-09 | Cisco Technology, Inc. | Automatic characterization of AP behaviors |
US11070392B2 (en) | 2017-10-27 | 2021-07-20 | Hilton International Holding Llc | System and method for provisioning internet access |
EP3557588A1 (en) * | 2018-04-16 | 2019-10-23 | Siemens Healthcare GmbH | Integrated method for cancer screening |
US11915826B2 (en) * | 2019-06-07 | 2024-02-27 | Welch Allyn, Inc. | Digital image screening and/or diagnosis using artificial intelligence |
US11196656B1 (en) | 2021-02-03 | 2021-12-07 | Vignet Incorporated | Improving diversity in cohorts for health research |
US11296971B1 (en) | 2021-02-03 | 2022-04-05 | Vignet Incorporated | Managing and adapting monitoring programs |
US11789837B1 (en) * | 2021-02-03 | 2023-10-17 | Vignet Incorporated | Adaptive data collection in clinical trials to increase the likelihood of on-time completion of a trial |
Family Cites Families (150)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5669877A (en) | 1994-03-07 | 1997-09-23 | Sims Deltec, Inc. | Systems and methods for automated testing of medical equipment |
US4946679A (en) | 1988-07-25 | 1990-08-07 | Thys Jacobs Susan | Method for the treatment of premenstrual syndrome |
EP0542717B1 (en) | 1988-12-20 | 1997-02-12 | Nippon Steel Corporation | Blast furnace operation management method and apparatus |
US5508912A (en) | 1989-01-23 | 1996-04-16 | Barry Schneiderman | Clinical database of classified out-patients for tracking primary care outcome |
JP2955873B2 (en) * | 1989-08-10 | 1999-10-04 | 富士写真フイルム株式会社 | Image processing device |
CA2081571C (en) | 1990-05-01 | 1998-09-15 | Nancy A. K. Perkins | Health care services comparison processing |
US5544044A (en) | 1991-08-02 | 1996-08-06 | United Healthcare Corporation | Method for evaluation of health care quality |
US5359509A (en) | 1991-10-31 | 1994-10-25 | United Healthcare Corporation | Health care payment adjudication and review system |
US5307262A (en) | 1992-01-29 | 1994-04-26 | Applied Medical Data, Inc. | Patient data quality review method and system |
EP0596247A3 (en) | 1992-11-02 | 1994-10-12 | Motorola Inc | A full-text index creation, search, retrieval and display method. |
US6196970B1 (en) | 1999-03-22 | 2001-03-06 | Stephen J. Brown | Research data collection and analysis |
US5365425A (en) | 1993-04-22 | 1994-11-15 | The United States Of America As Represented By The Secretary Of The Air Force | Method and system for measuring management effectiveness |
WO1995000914A1 (en) | 1993-06-28 | 1995-01-05 | Scott & White Memorial Hospital And Scott, Sherwood And Brindley Foundation | Electronic medical record using text database |
US5935060A (en) | 1996-07-12 | 1999-08-10 | First Opinion Corporation | Computerized medical diagnostic and treatment advice system including list based processing |
US5652842A (en) | 1994-03-01 | 1997-07-29 | Healthshare Technology, Inc. | Analysis and reporting of performance of service providers |
US5738102A (en) | 1994-03-31 | 1998-04-14 | Lemelson; Jerome H. | Patient monitoring system |
US5557514A (en) | 1994-06-23 | 1996-09-17 | Medicode, Inc. | Method and system for generating statistically-based medical provider utilization profiles |
US5845253A (en) | 1994-08-24 | 1998-12-01 | Rensimer Enterprises, Ltd. | System and method for recording patient-history data about on-going physician care procedures |
US5737539A (en) | 1994-10-28 | 1998-04-07 | Advanced Health Med-E-Systems Corp. | Prescription creation system |
US5657255C1 (en) | 1995-04-14 | 2002-06-11 | Interleukin Genetics Inc | Hierarchic biological modelling system and method |
US5619991A (en) | 1995-04-26 | 1997-04-15 | Lucent Technologies Inc. | Delivery of medical services using electronic data communications |
US5717737A (en) * | 1995-06-01 | 1998-02-10 | Padcom, Inc. | Apparatus and method for transparent wireless communication between a remote device and a host system |
US6418324B1 (en) * | 1995-06-01 | 2002-07-09 | Padcom, Incorporated | Apparatus and method for transparent wireless communication between a remote device and host system |
US5706441A (en) | 1995-06-07 | 1998-01-06 | Cigna Health Corporation | Method and apparatus for objectively monitoring and assessing the performance of health-care providers |
US5664109A (en) * | 1995-06-07 | 1997-09-02 | E-Systems, Inc. | Method for extracting pre-defined data items from medical service records generated by health care providers |
US5835897C1 (en) | 1995-06-22 | 2002-02-19 | Symmetry Health Data Systems | Computer-implemented method for profiling medical claims |
US5899998A (en) | 1995-08-31 | 1999-05-04 | Medcard Systems, Inc. | Method and system for maintaining and updating computerized medical records |
US5924073A (en) | 1995-11-14 | 1999-07-13 | Beacon Patient Physician Association, Llc | System and method for assessing physician performance using robust multivariate techniques of statistical analysis |
US5724573A (en) | 1995-12-22 | 1998-03-03 | International Business Machines Corporation | Method and system for mining quantitative association rules in large relational tables |
US6125194A (en) | 1996-02-06 | 2000-09-26 | Caelum Research Corporation | Method and system for re-screening nodules in radiological images using multi-resolution processing, neural network, and image processing |
US6678669B2 (en) | 1996-02-09 | 2004-01-13 | Adeza Biomedical Corporation | Method for selecting medical and biochemical diagnostic tests using neural network-related applications |
US5811437A (en) | 1996-05-21 | 1998-09-22 | Eli Lilly And Company | Methods of increasing nitric oxide synthesis |
US6108635A (en) | 1996-05-22 | 2000-08-22 | Interleukin Genetics, Inc. | Integrated disease information system |
US6083693A (en) * | 1996-06-14 | 2000-07-04 | Curagen Corporation | Identification and comparison of protein-protein interactions that occur in populations |
US5903889A (en) | 1997-06-09 | 1999-05-11 | Telaric, Inc. | System and method for translating, collecting and archiving patient records |
US6253186B1 (en) | 1996-08-14 | 2001-06-26 | Blue Cross Blue Shield Of South Carolina | Method and apparatus for detecting fraud |
CN100335501C (en) * | 1996-09-26 | 2007-09-05 | 中外制药株式会社 | Antibody against human parathormone related peptides |
US5924074A (en) | 1996-09-27 | 1999-07-13 | Azron Incorporated | Electronic medical records system |
AU3930797A (en) | 1996-09-30 | 1998-04-02 | Smithkline Beecham Corporation | Disease management method and system |
US6532437B1 (en) * | 1996-10-23 | 2003-03-11 | Cornell Research Foundation, Inc. | Crystalline frap complex |
US6039688A (en) | 1996-11-01 | 2000-03-21 | Salus Media Inc. | Therapeutic behavior modification program, compliance monitoring and feedback system |
US6151581A (en) | 1996-12-17 | 2000-11-21 | Pulsegroup Inc. | System for and method of collecting and populating a database with physician/patient data for processing to improve practice quality and healthcare delivery |
US5878232A (en) * | 1996-12-27 | 1999-03-02 | Compaq Computer Corporation | Dynamic reconfiguration of network device's virtual LANs using the root identifiers and root ports determined by a spanning tree procedure |
AU5405798A (en) | 1996-12-30 | 1998-07-31 | Imd Soft Ltd. | Medical information system |
US6259890B1 (en) | 1997-03-27 | 2001-07-10 | Educational Testing Service | System and method for computer based test creation |
US6078894A (en) | 1997-03-28 | 2000-06-20 | Clawson; Jeffrey J. | Method and system for evaluating the performance of emergency medical dispatchers |
US6058322A (en) * | 1997-07-25 | 2000-05-02 | Arch Development Corporation | Methods for improving the accuracy in differential diagnosis on radiologic examinations |
US6587829B1 (en) | 1997-07-31 | 2003-07-01 | Schering Corporation | Method and apparatus for improving patient compliance with prescriptions |
US5908383A (en) | 1997-09-17 | 1999-06-01 | Brynjestad; Ulf | Knowledge-based expert interactive system for pain |
US6139494A (en) | 1997-10-15 | 2000-10-31 | Health Informatics Tools | Method and apparatus for an integrated clinical tele-informatics system |
US6212526B1 (en) | 1997-12-02 | 2001-04-03 | Microsoft Corporation | Method for apparatus for efficient mining of classification models from databases |
JP4183311B2 (en) | 1997-12-22 | 2008-11-19 | 株式会社リコー | Document annotation method, annotation device, and recording medium |
US6230142B1 (en) | 1997-12-24 | 2001-05-08 | Homeopt, Llc | Health care data manipulation and analysis system |
EP0936566A3 (en) | 1998-02-11 | 2002-01-23 | Siemens Aktiengesellschaft | System for carrying out medical trials |
US20040067547A1 (en) | 1998-03-31 | 2004-04-08 | Stuart Harbron | Rapid method for detecting micro-organisms and evaluating antimicrobial activity |
EP1068568A4 (en) * | 1998-04-03 | 2004-10-27 | Triangle Pharmaceuticals Inc | Systems, methods and computer program products for guiding the selection of therapeutic treatment regimens |
US6173280B1 (en) | 1998-04-24 | 2001-01-09 | Hitachi America, Ltd. | Method and apparatus for generating weighted association rules |
US7444308B2 (en) | 2001-06-15 | 2008-10-28 | Health Discovery Corporation | Data mining platform for bioinformatics and other knowledge discovery |
DE19820276A1 (en) | 1998-05-07 | 1999-11-18 | Gerd Assmann | Computation of global heart failure risk factors |
US6212519B1 (en) | 1998-06-30 | 2001-04-03 | Simulconsult, Inc. | Systems and methods for quantifying qualitative medical expressions |
US6338042B1 (en) | 1998-07-10 | 2002-01-08 | Siemens Information And Communication Networks, Inc. | Method and apparatus for integrating competency measures in compensation decisions |
US6915254B1 (en) | 1998-07-30 | 2005-07-05 | A-Life Medical, Inc. | Automatically assigning medical codes using natural language processing |
US6266645B1 (en) | 1998-09-01 | 2001-07-24 | Imetrikus, Inc. | Risk adjustment tools for analyzing patient electronic discharge records |
US6067466A (en) | 1998-11-18 | 2000-05-23 | New England Medical Center Hospitals, Inc. | Diagnostic tool using a predictive instrument |
US6381576B1 (en) | 1998-12-16 | 2002-04-30 | Edward Howard Gilbert | Method, apparatus, and data structure for capturing and representing diagnostic, treatment, costs, and outcomes information in a form suitable for effective analysis and health care guidance |
CN1258148A (en) * | 1998-12-18 | 2000-06-28 | 北京赛得康通信技术有限公司 | Communication method for externally interactive virtual local area network |
JP2002533169A (en) | 1998-12-29 | 2002-10-08 | オキュロジックス コーポレイション | Rheological treatment method and associated apheresis system |
US6272472B1 (en) | 1998-12-29 | 2001-08-07 | Intel Corporation | Dynamic linking of supplier web sites to reseller web sites |
US6128620A (en) | 1999-02-02 | 2000-10-03 | Lemed Inc | Medical database for litigation |
US6253064B1 (en) * | 1999-02-25 | 2001-06-26 | David A. Monroe | Terminal based traffic management and security surveillance system for aircraft and other commercial vehicles |
US6937574B1 (en) * | 1999-03-16 | 2005-08-30 | Nortel Networks Limited | Virtual private networks and methods for their operation |
US6484144B2 (en) | 1999-03-23 | 2002-11-19 | Dental Medicine International L.L.C. | Method and system for healthcare treatment planning and assessment |
US6529876B1 (en) * | 1999-03-26 | 2003-03-04 | Stephen H. Dart | Electronic template medical records coding system |
CA2336303A1 (en) | 1999-04-28 | 2000-11-02 | Alean Kirnak | Electronic medical record registry including data replication |
US6847620B1 (en) * | 1999-05-13 | 2005-01-25 | Intermec Ip Corp. | Mobile virtual LAN |
WO2000075820A2 (en) | 1999-06-02 | 2000-12-14 | Algorithmics International Corp. | Risk management system, distributed framework and method |
US6312378B1 (en) | 1999-06-03 | 2001-11-06 | Cardiac Intelligence Corporation | System and method for automated collection and analysis of patient information retrieved from an implantable medical device for remote patient care |
US6611825B1 (en) | 1999-06-09 | 2003-08-26 | The Boeing Company | Method and system for text mining using multidimensional subspaces |
SE513703C2 (en) * | 1999-06-16 | 2000-10-23 | Ericsson Telefon Ab L M | Device and method of a switched telecommunication system |
US6804656B1 (en) * | 1999-06-23 | 2004-10-12 | Visicu, Inc. | System and method for providing continuous, expert network critical care services from a remote location(s) |
US7256708B2 (en) * | 1999-06-23 | 2007-08-14 | Visicu, Inc. | Telecommunications network for remote patient monitoring |
US20010051882A1 (en) | 1999-07-13 | 2001-12-13 | Murphy Kevin M. | Integrated care management system |
US6961687B1 (en) | 1999-08-03 | 2005-11-01 | Lockheed Martin Corporation | Internet based product data management (PDM) system |
EP1079656B1 (en) * | 1999-08-23 | 2004-11-24 | Lucent Technologies Inc. | Routing area update optimisation in standby state for multi-system packet radio networks |
US6611846B1 (en) | 1999-10-30 | 2003-08-26 | Medtamic Holdings | Method and system for medical patient data analysis |
US6571221B1 (en) * | 1999-11-03 | 2003-05-27 | Wayport, Inc. | Network communication service with an improved subscriber model using digital certificates |
EP1226697B1 (en) * | 1999-11-03 | 2010-09-22 | Wayport, Inc. | Distributed network communication system which enables multiple network providers to use a common distributed network infrastructure |
US6366561B1 (en) * | 1999-11-03 | 2002-04-02 | Qualcomm Inc. | Method and apparatus for providing mobility within a network |
US20020026332A1 (en) | 1999-12-06 | 2002-02-28 | Snowden Guy B. | System and method for automated creation of patient controlled records |
US6980958B1 (en) | 2000-01-11 | 2005-12-27 | Zycare, Inc. | Apparatus and methods for monitoring and modifying anticoagulation therapy of remotely located patients |
US6645959B1 (en) | 2000-01-26 | 2003-11-11 | Warner-Lambert Company | Method for treating postoperative ileus |
AU2001233104A1 (en) | 2000-01-28 | 2001-08-07 | Acurian, Inc. | Systems and methods for selecting and recruiting investigators and subjects for clinical studies |
WO2001059687A1 (en) | 2000-02-09 | 2001-08-16 | Patientpower.Com, Llc | Method and system for managing patient medical records |
US20020068857A1 (en) | 2000-02-14 | 2002-06-06 | Iliff Edwin C. | Automated diagnostic system and method including reuse of diagnostic objects |
US6941271B1 (en) | 2000-02-15 | 2005-09-06 | James W. Soong | Method for accessing component fields of a patient record by applying access rules determined by the patient |
US20020038227A1 (en) | 2000-02-25 | 2002-03-28 | Fey Christopher T. | Method for centralized health data management |
US6801816B2 (en) | 2000-02-28 | 2004-10-05 | International Flavors & Fragrances Inc. | Customer controlled manufacturing process and user interface |
US6988075B1 (en) | 2000-03-15 | 2006-01-17 | Hacker L Leonard | Patient-controlled medical information system and method |
US6876642B1 (en) * | 2000-03-27 | 2005-04-05 | Delphi Technologies, Inc. | In-vehicle wireless local area network |
US6322504B1 (en) | 2000-03-27 | 2001-11-27 | R And T, Llc | Computerized interactive method and system for determining a risk of developing a disease and the consequences of developing the disease |
CA2403874A1 (en) * | 2000-03-28 | 2001-12-06 | Dana-Farber Cancer Institute, Inc. | Molecular database for antibody characterization |
US20010032195A1 (en) | 2000-03-30 | 2001-10-18 | Graichen Catherine Mary | System and method for identifying productivity improvements in a business organization |
US7274810B2 (en) | 2000-04-11 | 2007-09-25 | Cornell Research Foundation, Inc. | System and method for three-dimensional image rendering and analysis |
JP2001297157A (en) | 2000-04-12 | 2001-10-26 | Terumo Corp | Medical information communication equipment, control method therefor and storage medium |
US7483838B1 (en) | 2000-04-21 | 2009-01-27 | James D. Marks | System and method for recruitment of candidates for clinical trials while maintaining security |
US20030036683A1 (en) | 2000-05-01 | 2003-02-20 | Kehr Bruce A. | Method, system and computer program product for internet-enabled, patient monitoring system |
US7356841B2 (en) * | 2000-05-12 | 2008-04-08 | Solutioninc Limited | Server and method for providing specific network services |
US20020010597A1 (en) | 2000-05-19 | 2002-01-24 | Mayer Gregg L. | Systems and methods for electronic health management |
US20040248092A1 (en) * | 2000-05-26 | 2004-12-09 | Vance Jeffrey M | Methods of screening for parkinsons's disease |
US7099339B1 (en) | 2000-06-22 | 2006-08-29 | Nokia Corporation | Apparatus, and associated method, for integrating operation of packet radio communication systems |
US20020038310A1 (en) | 2000-07-17 | 2002-03-28 | Reitberg Donald P. | Single-patient drug trials used with accumulated database: genomic markers |
US6826536B1 (en) | 2000-07-22 | 2004-11-30 | Bert Forman | Health care billing monitor system for detecting health care provider fraud |
US6915266B1 (en) | 2000-07-31 | 2005-07-05 | Aysha Saeed | Method and system for providing evaluation data from tracked, formatted administrative data of a service provider |
WO2002015582A1 (en) * | 2000-08-16 | 2002-02-21 | The Boeing Company | Method and apparatus for providing bi-directional data services and live television programming to mobile platforms |
CA2420400A1 (en) | 2000-08-24 | 2002-02-28 | Veritas Medicine, Inc. | Recruiting a patient into a clinical trial |
US7685005B2 (en) | 2000-08-29 | 2010-03-23 | Medtronic, Inc. | Medical device systems implemented network scheme for remote patient management |
AU2001286902A1 (en) | 2000-08-30 | 2002-03-13 | Healtheheart, Inc. | Patient analysis and risk reduction system and associated methods |
US20020077853A1 (en) | 2000-09-15 | 2002-06-20 | Kevin Boru | System for selecting clinical trials |
US20020061758A1 (en) * | 2000-11-17 | 2002-05-23 | Crosslink, Inc. | Mobile wireless local area network system for automating fleet operations |
SE517729C2 (en) | 2000-11-24 | 2002-07-09 | Columbitech Ab | Method for maintaining communication between units belonging to different communication networks |
US20020123905A1 (en) | 2000-12-13 | 2002-09-05 | Joane Goodroe | Clinical operational and gainsharing information management system |
US6938206B2 (en) | 2001-01-19 | 2005-08-30 | Transolutions, Inc. | System and method for creating a clinical resume |
US6551243B2 (en) | 2001-01-24 | 2003-04-22 | Siemens Medical Solutions Health Services Corporation | System and user interface for use in providing medical information and health care delivery support |
US7756722B2 (en) * | 2001-02-01 | 2010-07-13 | Georgetown University | Clinical management system from chronic illnesses using telecommunication |
US7346521B2 (en) | 2001-03-05 | 2008-03-18 | Ims Health Incorporated | System and methods for generating physician profiles concerning prescription therapy practices |
US20020138492A1 (en) | 2001-03-07 | 2002-09-26 | David Kil | Data mining application with improved data mining algorithm selection |
US6879970B2 (en) | 2001-04-02 | 2005-04-12 | Invivodata, Inc. | Apparatus and method for prediction and management of subject compliance in clinical research |
US6533724B2 (en) * | 2001-04-26 | 2003-03-18 | Abiomed, Inc. | Decision analysis system and method for evaluating patient candidacy for a therapeutic procedure |
US20020159407A1 (en) * | 2001-04-30 | 2002-10-31 | Carrafiello Michael W. | Method and apparatus for scalable, line-rate protocol-independent switching between multiple remote access points in a wireless local area network |
AU2002305577A1 (en) | 2001-05-15 | 2002-11-25 | Dominic A. Marasco | System and method for managing interactions between healthcare providers and pharma companies |
CA2448915A1 (en) * | 2001-06-01 | 2002-12-12 | Prosanos Corporation | Information processing method for disease stratification and assessment of disease progressing |
US7483411B2 (en) * | 2001-06-04 | 2009-01-27 | Nec Corporation | Apparatus for public access mobility LAN and method of operation thereof |
US6990338B2 (en) * | 2001-06-11 | 2006-01-24 | The Boeing Company | Mobile wireless local area network and related methods |
US6611510B2 (en) * | 2001-06-18 | 2003-08-26 | Telcordia Technologies Inc. | Method and system for soft handoff of mobile terminals in IP wireless networks. |
US20030208382A1 (en) | 2001-07-05 | 2003-11-06 | Westfall Mark D | Electronic medical record system and method |
US7130457B2 (en) * | 2001-07-17 | 2006-10-31 | Accuimage Diagnostics Corp. | Systems and graphical user interface for analyzing body images |
US7529685B2 (en) | 2001-08-28 | 2009-05-05 | Md Datacor, Inc. | System, method, and apparatus for storing, retrieving, and integrating clinical, diagnostic, genomic, and therapeutic data |
US20030050794A1 (en) | 2001-09-07 | 2003-03-13 | Marjorie Keck | Hospital emergency department resource utilization and optimization system |
US6802810B2 (en) | 2001-09-21 | 2004-10-12 | Active Health Management | Care engine |
DE10247459A1 (en) | 2001-10-31 | 2003-07-03 | Caterpillar Inc | Health information analysis method and system |
JP2005523490A (en) | 2001-11-02 | 2005-08-04 | シーメンス メディカル ソリューションズ ユーエスエー インコーポレイテッド | Patient data mining for compliance automation |
AU2002363329A1 (en) | 2001-11-06 | 2003-05-19 | Elizabeth Gray | Pharmacogenomics-based system for clinical applications |
US7099283B2 (en) * | 2002-01-25 | 2006-08-29 | Ntt Docomo, Inc. | Quality of service aware handoff trigger |
US20040078216A1 (en) | 2002-02-01 | 2004-04-22 | Gregory Toto | Clinical trial process improvement method and system |
US6925069B2 (en) * | 2002-04-19 | 2005-08-02 | Meshnetworks, Inc. | Data network having a wireless local area network with a packet hopping wireless backbone |
US7698157B2 (en) | 2002-06-12 | 2010-04-13 | Anvita, Inc. | System and method for multi-dimensional physician-specific data mining for pharmaceutical sales and marketing |
US7290016B2 (en) | 2003-05-27 | 2007-10-30 | Frank Hugh Byers | Method and apparatus for obtaining and storing medical history records |
US20050256738A1 (en) | 2004-05-11 | 2005-11-17 | Petrimoulx Harold J | Methods and systems for identifying health care professionals with a prescribed attribute |
US20060122864A1 (en) | 2004-12-02 | 2006-06-08 | Gottesman Janell M | Patient management network |
US20060136259A1 (en) | 2004-12-17 | 2006-06-22 | General Electric Company | Multi-dimensional analysis of medical data |
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2002
- 2002-09-09 US US10/237,574 patent/US7680086B2/en not_active Expired - Fee Related
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2003
- 2003-05-02 CN CNB038211823A patent/CN100366009C/en not_active Expired - Fee Related
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- 2003-05-02 CA CA2498053A patent/CA2498053C/en not_active Expired - Fee Related
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AU2003229425A1 (en) | 2004-03-29 |
US8682693B2 (en) | 2014-03-25 |
WO2004023724A1 (en) | 2004-03-18 |
EP1537703B1 (en) | 2012-10-17 |
JP2005538585A (en) | 2005-12-15 |
CA2498053A1 (en) | 2004-03-18 |
EP1537703A1 (en) | 2005-06-08 |
US20040047320A1 (en) | 2004-03-11 |
AU2003229425B2 (en) | 2009-03-26 |
CN1701563A (en) | 2005-11-23 |
US7680086B2 (en) | 2010-03-16 |
KR20050057275A (en) | 2005-06-16 |
JP4065448B2 (en) | 2008-03-26 |
US20070239491A1 (en) | 2007-10-11 |
CN100366009C (en) | 2008-01-30 |
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