WO2004002090A2 - Adaptive feedback technique implemented in mobile ip networks - Google Patents
Adaptive feedback technique implemented in mobile ip networks Download PDFInfo
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- WO2004002090A2 WO2004002090A2 PCT/US2003/019862 US0319862W WO2004002090A2 WO 2004002090 A2 WO2004002090 A2 WO 2004002090A2 US 0319862 W US0319862 W US 0319862W WO 2004002090 A2 WO2004002090 A2 WO 2004002090A2
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Classifications
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Definitions
- the present invention is related generally to data networks, and more specifically to an adaptive feedback technique implemented in Mobile IP networks.
- Mobile IP (herein referred to as "MIP") is a protocol which allows laptop computers or other mobile computer units (referred to as “Mobile Nodes” herein) to roam between various sub-networks at various locations ⁇ while maintaining internet and/or WAN connectivity. Without Mobile IP or related protocols, a Mobile Node would be unable to stay connected while roaming through various sub-networks. This is because the IP address required for any node to communicate over the internet is location specific. Each IP address has a field that specifies the particular sub-network on which the node resides. If a user desires to take a computer which is normally attached to one node and roam with it so that it passes through different sub-networks, it cannot use its home base EP address. As a result, a business person traveling across the country cannot merely roam with his or her computer across geographically disparate network segments or wireless nodes while remaining connected over the internet. This is not an acceptable state-of- affairs in the age of portable computational devices.
- Mobile IP protocol has been developed and implemented.
- An implementation of Mobile IP is described in RFC 3220 of the IP Routing for Wireless/Mobile Hosts Working Group, C. Perkins, Ed., January, 2002.
- Mobile IP is also described in the text "Mobile LP Unplugged" by J. Solomon, Prentice Hall. Both of these references are incorporated herein by reference in their entireties and for all purposes.
- a Mobile IP environment 2 includes the internet (or a WAN) 4 over which a Mobile Node 6 can communicate remotely via mediation by a Home Agent 8 and a Foreign Agent (FA) (e.g. Foreign Agent 10a).
- FA Foreign Agent
- Foreign Agent are routers or other network connection devices performing appropriate Mobile IP functions as implemented by software, hardware, and/or firmware.
- a particular Mobile Node e.g., a laptop computer
- Home Agent When the Mobile Node roams, it communicates via the internet through an available Foreign Agent.
- Mobile Node 6 normally resides on (or is “based at") a network segment 12 which allows its network entities to communicate over the internet 4 through Home Agent 8 (an appropriately configured router denoted HA).
- Home Agent 8 need not directly connect to the internet.
- it may be connected through another router (a router Rl in this case).
- Router Rl may, in turn, connect one or more other routers (e.g., a router R3) with the internet.
- a mobile node is pre-configured with information identifying its Home Agent, hi addition, both the mobile node and its Home Agent are also pre-configured with a shared key and Security Parameter Index (SPI) for the shared key, commonly referred to as a security association.
- SPI Security Parameter Index
- each Home Agent is pre-configured with information identifying mobile nodes that it supports as well as the corresponding security associations. In this manner, a mobile node is "anchored" to a specific Home Agent to enable it to subsequently register with that Home Agent and receive messages via that Home Agent from Correspondent Nodes.
- Network segment 14a may include various other nodes such as a PC 16.
- the nodes on network segment 14a communicate with the internet through a router which doubles as Foreign Agent 10a.
- a Mobile LP network may include many different network segments (e.g., 14b, 14c), with each network segment having a respective Foreign Agent (e.g., 10b, 10c).
- a variety of different link types e.g., GPRS, CDMA, wireless LAN, fixed Ethernet, CDPD, etc. may be used to communicate with the different Foreign Agents in the Mobile IP network.
- communication with Foreign Agent 10a may be achieved using a CDMA link
- communication with Foreign Agent 10b may be achieved using a wireless LAN link
- communication with Foreign Agent 10c may be achieved using a CDPD link.
- Each type of communication link has different associated link characteristics, including different bandwidth characteristics.
- the bandwidth of a GPRS link type may be about 144 Kbps
- the bandwidth of a fixed Ethernet link type may be about 100 Mbps
- the bandwidth of a CDPD link type may be about 9.6 Kbps.
- Mobile Node 6 may identify Foreign Agent 10a through various agent solicitations and agent advertisements which form part of the Mobile IP protocol.
- Mobile Node 6 engages with network segment 14a, it composes a registration request for the Home Agent 8 to bind the Mobile Node's current location with its home location.
- Foreign Agent 10a then relays the registration request to Home Agent 8 (as indicated by the dotted line "Registration").
- the Home Agent and the Mobile Node 6 may then negotiate the conditions of the Mobile Node's attachment to Foreign Agent 10a. For example, the Mobile Node 6 may request a registration lifetime of 5 hours, but the Home Agent 8 may grant only a 3 hour period. Therefore, the attachment may be limited to a period of time.
- Home Agent 8 updates an internal "mobility binding table" which links the Mobile Node's current location via its care-of address (e.g., a collocated care-of address or the Foreign Agent's IP address) to the identity (e.g., home address) of Mobile Node 6. Further, if the Mobile Node 6 registered via a Foreign Agent, the Foreign Agent 10a updates an internal "visitor table" which specifies the Mobile Node address, Home Agent address, etc. In effect, the Mobile Node's home base IP address (associated with segment 12) has been binded to the care-of address such as the Foreign Agent's IP address (associated with segment 14a).
- care-of address e.g., a collocated care-of address or the Foreign Agent's IP address
- the identity e.g., home address
- Correspondent Node 18 wishes to send a message to a Correspondent Node 18 from its new location.
- An output message from the Mobile Node is then packetized and forwarded through Foreign Agent 10a over the internet 4 to Correspondent Node 18 (as indicated by the dotted line "packet from MN") according to a standard Internet Protocol.
- Correspondent Node 18 wishes to send a message to Mobile Node — whether in reply to a message from the Mobile Node or for any other reason — it addresses that message to the IP address of Mobile Node 6 on sub-network 12.
- the packets of that message are then forwarded over the internet 4 and to router Rl and ultimately to Home Agent 8 as indicated by the dotted line ("packet to MN(1)").
- Home Agent 8 recognizes that Mobile Node 6 is no longer attached to network segment 12. It then encapsulates the packets from Correspondent Node 18 (which are addressed to Mobile Node 6 on network segment 12) according to a Mobile EP protocol and forwards these encapsulated packets to a "care of address for Mobile Node 6 as shown by the dotted line ("packet to MN(2)").
- the care-of address may be, for example, the EP address of Foreign Agent 10a.
- Foreign Agent 10a then strips the encapsulation and forwards the message to Mobile Node 6 on sub-network 14a.
- the packet forwarding mechanism implemented by the Home and Foreign Agents is often referred to as "tunneling.”
- Mobile LP solves a network layer mobility problem by maintaining the same home address even when the mobile node (MN) traverses subnets within one network domain, moves across different domains, and/or moves across different network types (e.g. fixed Ethernet, WLAN, CDMA 2000, GPRS, etc.).
- MN mobile node
- Mobile IP provides application layer/session continuity since the D? address of the mobile mode does not change as the mobile node roams to different network segments or subnetworks.
- the mobile data network includes plurality of mobile nodes which communicate with a data network via a plurality of network segments. Each network segment includes a communication link having associated link characteristics.
- the characteristics of the communication links which the mobile node uses to communicate with the data network may change as a result of the mobile node roaming to a new network segment.
- a change in at least one link characteristic (associated with the communication link used by the mobile node to communicate with the data network) is detected at the mobile node.
- the change in link characteristics may be detected by a Mobile IP layer of the mobile node.
- Applications or other software entities at the application layer of the mobile node may then be notified of information relating to the change in the at least one link characteristic to thereby enable the applications to adapt to the change in the at least one link characteristic.
- the change in at least one link characteristic may include a change in link bandwidth.
- applications, protocols, and/or other mechanisms implemented at the transport layer and/or application layer will be notified of the change in link bandwidth in order to allow such applications, protocols, and/or mechanisms to dynamically adapt to the change in link bandwidth.
- an RTP/RTCP layer at the mobile node may be notified of information relating to the change in the at least one link characteristic to thereby enable the RTP/RTCP layer to dynamically adapt to the change in the at least one link characteristic.
- Such adaptations may include, for example, dynamically modifying a session bandwidth parameter associated with an RTCP portion of the RTP/RTCP layer, dynamically modifying an RTP message encoding format to accommodate the change in the at least one link characteristic, notifying other participants in a real-time application session of the change in the at least one link characteristic, etc.
- a spoofed source quench message may be generated at the mobile node in response to detecting a change in at least one link characteristic, hi one implementation, the spoofed source quench message is compatible with an ICMP protocol. Further, according to one implementation, a source address of the spoofed source quench message may correspond to a network address of a corresponding node in the mobile data network which is engaged in a communication session with the mobile node, and a destination address of the spoofed source quench may message correspond to a home or network address of the mobile node.
- FIGURE 1 is a diagram of a Mobile EP network segment and associated environment.
- FIGURES 2A and 2B illustrate various layers which may exist in a Mobile IP node such as mobile node 6 of FIGURE 1.
- FIGURE 3 shows a flow diagram of an Source Quench Message Spoofing Procedure 300 in accordance with a specific embodiment of the present invention.
- FIGURE 4 A shows a flow diagram of a Link Characteristic Change Call Back Procedure A 400 in accordance with a specific embodiment of the present invention.
- FIGURE 4B shows an alternate embodiment of a Link Characteristic Change Call Back Procedure 450 in accordance with a specific embodiment of the present invention.
- FIGURE 5 A and 5B shows examples of a real-time application session which include multiple participants.
- FIGURE 6A shows a flow diagram of a Link Change Descriptor Processing Procedure 600 in accordance with a specific embodiment of the present invention.
- FIGURE 6B shows a specific embodiment of a Link Change Descriptor Processing Procedure 650 which may be implemented at a participant node of a realtime application session.
- FIGURE 7 is a diagram illustrating an exemplary network device in which embodiments of the invention may be implemented.
- Various aspects of the present invention describe an adaptive and/or proactive feedback technique in a Mobile D? environment in which Mobile IP (also referred to as the Mobile IP layer) provides early feedback to mechanisms in the transport layer and/or application layer in response to detecting changes in link characteristics (e.g., changes in link type, changes in link bandwidth, etc.) at a mobile node.
- appropriate measures may then be taken in order to accommodate the changes in link characteristics.
- Such appropriate measures may include, for example, providing feedback to media aware applications in order to allow such applications to dynamically adjust their bandwidth requirements to accommodate the new link characteristics, modifying timeout parameters, modifying an encoding formats to accommodate the new link characteristics, notifying participants in a real-time application session of the detected changes in the link characteristics, etc.
- proactive measures may be taken to mitigate the effect of the link characteristic changes to thereby provide improved network performance in a time frame which is significantly faster than conventional transport layer feedback mechanisms.
- FIGURES 2A and 2B illustrate various layers which may exist at a mobile node such as mobile node 6 of FIGURE 1.
- data communication to/from mobile node 6 may be accomplished via a plurality of layers as shown, for example, in FIGURE 2A.
- the plurality of layers may include a link layer 202, and network layer 204, a transport layer 206, an application layer 208, etc.
- the purpose and function of each of the layers illustrated in FIGURE 2A will generally be known to one having ordinary skill in the art.
- Mobile IP functionality in the network layer 204 may be used to detect changes in link characteristics (e.g. link type, bandwidth, etc.) attributable, for example, to the mobile node moving through the Mobile IP network.
- Mobile IP responds to changes detected in the link characteristics by directly notifying applications at the application layer 208 in order to cause the applications to dynamically adapt to the new link characteristics.
- Mobile LP may respond to a change detected in the link characteristics by notifying the transport layer 206 of changes in the link characteristics. The transport layer 206 may then cause applications in the application layer 208 to dynamically adapt to the new link characteristics.
- Such adaptations may include increasing or decreasing the data rates associated with one or more applications, changing encoding formats for transmitting and/or receiving data, etc.
- FIGURE 2B shows a specific embodiment of various layers which may be used for effecting communication at the mobile node 6 of FIGURE 1.
- the mobile node may include a plurality of sublayers or protocols such as, for example, a link layer 252; a IP/Mobile IP layer 254 which resides at the network layer 204; a TCP layer and/or UDP layer 256 which may reside at the transport layer 206; an RTCP RTP layer 258, portions of which may reside at the transport layer 206 and/or the application layer 208; and application layer 260.
- the application layer 260 may include one or more applications which are configured to run at the mobile node.
- a number of different mechanisms may be used to provide early feedback to the transport layer and/or application layer (e.g., either independently or simultaneously) in response a change in one or more link characteristic being detected at the Mobile IP layer. At least some of these mechanisms are described in greater detail below.
- a first mechanism which may be used to implement the adaptive feedback technique of the present invention is to generate a spoofed ICMP source quench message at a mobile node which undergoes a link change from high bandwidth link type to low bandwidth link type.
- ICMP stands for Internet Control Message Protocol, which is described in RFC 792, herein incorporated by reference in its entirety for all purposes.
- an ICMP source quench message represents a request to a host or source device to cutback the rate at which it is sending traffic to the Internet destination.
- the destination device may respond by sending an ICMP source quench message to the source device.
- the source device On receipt of a source quench message, the source device will cut back the rate at which it is sending traffic to the destination device until it no longer receives source quench messages. The source device may then gradually increase the rate at which it sends traffic to the destination device until it again receives source quench messages.
- a mobile node implemented in accordance with specific embodiment of the present invention may be configured or designed to generate a spoofed ICMP source quench message which is used locally at the various layers of the mobile node to thereby cause applications at the local mobile node to reduce the rate at which the applications are sending traffic over the communication link.
- a spoofed ICMP source quench message which is used locally at the various layers of the mobile node to thereby cause applications at the local mobile node to reduce the rate at which the applications are sending traffic over the communication link.
- FIGURE 3 shows a flow diagram of a Source Quench Message Spoofing Procedure 300 in accordance with a specific embodiment of the present invention.
- the ICMP Source Quench Message Spoofing Procedure 300 may be implemented at one or more mobile nodes in the Mobile IP network. As the mobile node moves through the Mobile IP network, it may connect with different foreign agents via a variety of different link types (e.g., fixed Ethernet, WLAN, CDMA, GPRS, CDPD, etc.).
- link types e.g., fixed Ethernet, WLAN, CDMA, GPRS, CDPD, etc.
- the Mobile IP layer detects (302) a change in the link characteristics (e.g., a change in link type, which may occur, for example, when the mobile node roams to a new network segment and registers with a new foreign agent), a determination is made (304) as to whether the link bandwidth has decreased as a result of the change in link characteristics. If it is determined that the link bandwidth has decreased, then the addresses of the corresponding nodes (e.g., the nodes with which are currently engaged in a communication session with the mobile node) are identified (306). According to one implementation, the corresponding node addresses may be retrieved from IP data structures at the mobile node.
- a change in the link characteristics e.g., a change in link type, which may occur, for example, when the mobile node roams to a new network segment and registers with a new foreign agent
- One or more spoofed ICMP source quench messages may then be generated (308) at the mobile node and sent locally to the mobile node.
- each spoofed ICMP source quench message may be configured to appear as though the source quench message was sent from a corresponding node to the mobile node.
- a spoofed ICMP source quench message may be generated at mobile node 6 in which the source address of the spoofed source quench message corresponds to the address of corresponding node 18, and the destination address of the spoofed source quench message corresponds to the address of mobile node 6.
- one or more applications running at the mobile node may be caused to cutback the rate of data or other information being transmitted by such applications to a level which is appropriate for the new link bandwidth.
- the transport layer utilizes a TCP protocol (i.e., TCP layer)
- TCP layer the receipt of a spoofed ICMP source quench message will cause the TCP layer to induce a slow start mechanism in which the size of the TCP congestion window (CWND) is reset (e.g., to a smaller value).
- CWND TCP congestion window
- This reduction in the size of the congestion window will result in a reduction in the data rate of outgoing traffic which is transmitted by the mobile node.
- the TCP layer may also be desirable to induce the TCP layer to implement (310) a congestion avoidance mechanism, wherein, after the slow start mechanism has been implemented, the size of the congestion window increases linearly (with congestion avoidance being implemented), as opposed to increasing exponentially (e.g., without congestion avoidance being implemented). For example, according to a specific implementation, during congestion avoidance, the size of the congestion window may be incremented by one segment for each TCP-ACK which is received.
- TCP layer to provide an API to Mobile IP which allows Mobile LP to invoke congestion avoidance at desired times (e.g., upon detecting a link change with lower associated bandwidth characteristics).
- a second technique for inducing congestion avoidance at the TCP layer is by tricking the TCP layer into thinking that there is congestion on the link. One way to do this is by saving and re-sending a last received TCP-ACK message (at the mobile node) to the TCP layer. Such a technique may be referred to as spoofing a TCP-ACK segment in order to achieve congestion avoidance.
- Mobile D? it is also possible for Mobile D? to invoke slow start and/or congestion avoidance mechanisms at the application layer 208 via an API which is provided by applications at the application layer to Mobile IP.
- Another technique which may be used for implementing the adaptive feedback technique of the present invention is by the network layer triggering a call back mechanism at the transport layer (upon detection of a change in link characteristics at the mobile node) which, in turn, notifies one or more applications at the application layer of the change in link characteristics.
- the notified applications may be configured or designed to have mobile awareness capabilities such that, when the application receives notification of a change in link characteristics, the application is able to adapt to the change in link characteristics by taking appropriate action.
- FIGURE 4A shows a flow diagram of a Link Characteristic Change Call Back Procedure 400 in accordance with a specific embodiment of the present invention.
- the Link Characteristic Change Call Back Procedure 400 may be implemented at one or more mobile nodes in a Mobile IP network.
- the network layer e.g., Mobile IP
- the transport layer may invoke (406) an API to inform the transport layer of the change in link characteristics.
- the transport layer does not provide such an API to the network layer.
- the transport layer may be adapted to provide an API to Mobile IP which allows Mobile IP to trigger a call back into the transport layer to thereby cause the transport layer to signal applications running at the application layer to reduce their rate of data transmission in accordance with the new link characteristics.
- Such changes in link characteristics may include changing to a link type of higher bandwidth or changing to a link type of lower bandwidth.
- the transport layer may then use (408) an enhanced socket API to inform application(s) at the application layer of the changes in the link characteristics.
- the notification of the change in link characteristics provided from the transport layer to the application layer may be implemented using an asynchronous mechanism such as, for example, a signal which is sent to the application layer.
- the informed application(s) may then adjust (410) their data rate and/or take other appropriate action to adapt to new link characteristics.
- a mobile aware application may be informed of a change in link type using an enhanced socket/IOCTL interface. The application may then determine the change in link bandwidth according to the new link type, and take appropriate action to adjust its output data rate to accommodate the new link bandwidth.
- FIGURE 4B shows an alternate embodiment of a Link Characteristic Change Call Back Procedure 450 in accordance with a specific embodiment of the present invention, hi the embodiment of FIGURE 4B, it is assumed that one or more of the applications at the application layer have been configured or designed to include a mobility awareness mechanism, and to provide an API to be used by the network layer (e.g., Mobile IP) upon detection of a change in link characteristics.
- Mobile IP may inform 454 application(s) at the application layer of the new link characteristics via an appropriate API.
- the new link characteristics may include, for example, the identify of a new link type, new link bandwidth parameters, etc.
- the application(s) may then take appropriate action to adapt to the new link characteristics. According to a specific embodiment, such appropriate action may include modifying (456) an outgoing data rate associated with the application in accordance with the new linlc characteristics.
- Yet another technique which may be used for implementing the adaptive feedback technique of the present invention is for the network layer to notify the
- RTP/RTCP layer to take appropriate action in order to accommodate the new link characteristics.
- the RTP/RTCP protocol relates to a transport protocol for real-time applications, and is described in RFC 1889, herein incorporated by reference in its entirety for all purposes.
- RTCP defines a concept known as session bandwidth, wliich is related to an aggregate limit of bandwidth for a particular real-time session which has been implemented at a network node (e.g., mobile node 6).
- session bandwidth is calculated at initialization or at start up based upon the link characteristics at that time.
- the session bandwidth value does not change.
- a real-time application session (such as, for example, a video conference) may include a plurality of individual participants. This is illustrated in FIGURE 5 A of the drawings.
- FIGURE 5 A shows an example of a realtime application session 500a which includes 3 participants, namely participant PA 502a, participant P B 502b, and participant Pc 502c. Each of the participants may be associated with a different node in the network.
- a new party e.g., participant P D 502d, FIGURE 5B
- the RTP protocol running at each of the parties in the session may respond by changing their media encoding formats to accommodate the new party on the low bandwidth link.
- RFC 1889 there is currently no mechanism defined in RFC 1889 for accommodating a change in link characteristics of a current participant in the realtime application session.
- a mobile node e.g., mobile node 6, FIGURE 1
- the link type used by the mobile node changes to a lower bandwidth link as the result of the mobile node roaming in the IP network
- the Mobile IP layer can notify the RTP/RTCP layer of the change in link characteristics.
- a feedback mechanisms may be provided between the Mobile LP layer and the
- RTP/RTCP layer in order to inform the RTP/RTCP layer of changes in link characteristics which are detected by the Mobile IP layer. Such information may then be used to cause RTP/RTCP to take appropriate action in order to accommodate the new link characteristics.
- Such appropriate may include, for example, modifying the session bandwidth to accommodate the bandwidth associated with the new link type, notifying other participants in the session of a detected change in the link characteristics of at least one participant, modifying a local message encoding format to accommodate the new link characteristics, etc.
- FIGURE 6A shows a flow diagram of a Link Change Descriptor Processing Procedure 600 in accordance with a specific embodiment of the present invention.
- the Link Change Descriptor Processing Procedure 600 may be implemented at one or more mobile nodes in a Mobile IP network. For purposes of illustration, it is assumed that the Link Change Descriptor Processing Procedure 600 has been implemented at mobile node 6 of FIGURE 1.
- the Mobile node 6 may undergo one or more link changes as it registers with different foreign agents.
- the Mobile IP layer may detect (602) a change in link characteristics (such as, for example, a change in link type)
- the Mobile IP layer may then notify (606) the RTP/RTCP layer of the new link characteristics using, for example, a new API similar to that described with respect to operation 406 of FIGURE 4A.
- RTCP may modify or change its current session bandwidth parameter to accommodate the bandwidth associated with the new linlc characteristics.
- RTP may notify other peer devices (e.g., other session participants) of the detected change in link characteristics using a Link Characteristic Change Message.
- the Link Characteristic Change Message corresponds to a new source descriptor (compatible with a format defined by the RTP protocol) which may be used to inform other session participants of a change in link characteristics associated with a current session participant.
- the Link Characteristic Change Message may include new encoding information based on the new link characteristics.
- the link change descriptor may include information relating to the change in link bandwidth (e.g., either higher link bandwidth or lower link bandwidth) for a current session participant. Using the new link bandwidth information, the other participants may then adapt their encoding formats to accommodate the new link bandwidth parameters. Additionally, as shown at 612, RTP changes the local message encoding format (e.g. at mobile node 6) to accommodate the new link characteristics.
- FIGURE 6B shows a specific embodiment of a Link Change Descriptor Processing Procedure 650 which may be implemented at a participant node of a realtime application session.
- the RTP layer at the participant node adapts (654) its local message encoding format to adapt to the new link characteristic information contained in the Link Characteristic Change Message.
- Such information may include, for example, encoding information, link bandwidth information, etc.
- the participants of a real-time application session may dynamically and automatically accommodate changes in link bandwidth or other linlc characteristics which result from existing session participants migrating to different links within a Mobile IP network.
- the adaptive feedback technique of the present invention helps applications rapidly and dynamically adapt to changes in linlc characteristics (e.g., link type, link bandwidth, etc.) which may occur as a result of a mobile node moving through a Mobile IP network. Moreover, the adaptive feedback technique of the present invention helps to avoid congestion on relatively low bandwidth links which, in turn, may help to minimize disruption of service of other devices using the same link. Additionally, it will be appreciated that the adaptive feedback technique of the present invention may be used to allow applications to adapt to changes in link characteristics well before conventional transport layer feedback mechanisms kick in.
- linlc characteristics e.g., link type, link bandwidth, etc.
- the techniques of the present invention may be implemented on software and/or hardware.
- they can be implemented in an operating system kernel, in a separate user process, in a library package bound into network applications, on a specially constructed machine, or on a network interface card.
- the technique of the present invention is implemented in software such as an operating system or in an application running on an operating system.
- a software or software/hardware hybrid implementation of the techniques of this invention may be implemented on a general-purpose programmable machine selectively activated or reconfigured by a computer program stored in memory.
- a programmable machine may be a network device designed to handle network traffic, such as, for example, a router or a switch.
- Such network devices may have multiple network interfaces including frame relay and ISDN interfaces, for example. Specific examples of such network devices include routers and switches.
- the Home Agents of this invention may be implemented in specially configured routers or servers such as specially configured router models 1600, 2500, 2600, 3600, 4500, 4700, 7200, 7500, and 12000 available from Cisco Systems, Inc. of San Jose, California. A general architecture for some of these machines will appear from the description given below.
- the techniques of this invention may be implemented on a general-purpose network host machine such as a personal computer or workstation. Further, the invention may be at least partially implemented on a card (e.g., an interface card) for a network device or a general- purpose computing device.
- a card e.g., an interface card
- a network device 760 suitable for implementing the techniques of the present invention includes a master central processing unit (CPU) 762, interfaces 768, and a bus 767 (e.g., a PCI bus).
- the CPU 762 may be responsible for implementing specific functions associated with the functions of a desired network device.
- the CPU 762 may be responsible for analyzing packets, encapsulating packets, and forwarding packets for transmission to a set-top box.
- the CPU 762 preferably accomplishes all these functions under the control of software including an operating system (e.g. Windows NT), and any appropriate applications software.
- an operating system e.g. Windows NT
- CPU 762 may include one or more processors 763 such as a processor from the Motorola family of microprocessors or the MIPS family of microprocessors, hi an alternative embodiment, processor 763 is specially designed hardware for controlling the operations of network device 760.
- processors 763 such as a processor from the Motorola family of microprocessors or the MIPS family of microprocessors, hi an alternative embodiment, processor 763 is specially designed hardware for controlling the operations of network device 760.
- a memory 761 (such as non-volatile RAM and/or ROM) also forms part of CPU 762.
- Memory block 761 may be used for a variety of purposes such as, for example, caching and/or storing data, programming instructions, etc.
- the interfaces 768 are typically provided as interface cards (sometimes referred to as "line cards"). Generally, they control the sending and receiving of data packets over the network and sometimes support other peripherals used with the network device 760.
- the interfaces that may be provided are Ethernet interfaces, frame relay interfaces, cable interfaces, DSL interfaces, token ring interfaces, and the like.
- various very high-speed interfaces may be provided such as fast Ethernet interfaces, Gigabit Ethernet interfaces, ATM interfaces, HSSI interfaces, POS interfaces, FDDI interfaces, ASI interfaces, DHEI interfaces and the like.
- these interfaces may include ports appropriate for communication with the appropriate media. In some cases, they may also include an independent processor and, in some instances, volatile RAM.
- the independent processors may control such communications intensive tasks as packet switching, media control and management. By providing separate processors for the communications intensive tasks, these interfaces allow the master microprocessor 762 to efficiently perform routing computations, network diagnostics, security functions, etc.
- FIGURE 7 illustrates one specific network device of the present invention, it is by no means the only network device architecture on which the present invention can be implemented.
- an architecture having a single processor that handles communications as well as routing computations, etc. is often used.
- other types of interfaces and media could also be used with the network device.
- network device may employ one or more memories or memory modules (such as, for example, memory block 765) configured to store data, program instructions for the general-purpose network operations and/or other information relating to the functionality of the techniques described herein.
- the program instructions may control the operation of an operating system and/or one or more applications, for example.
- the present invention relates to machine readable media that include program instructions, state information, etc. for performing various operations described herein.
- machine-readable media include, but are not limited to, magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROM disks; magneto-optical media such as floptical disks; and hardware devices that are specially configured to store and perform program instructions, such as read-only memory devices (ROM) and random access memory (RAM).
- ROM read-only memory devices
- RAM random access memory
- the invention may also be embodied in a carrier wave traveling over an appropriate medium such as airwaves, optical lines, electric lines, etc.
- program instructions include both machine code, such as produced by a compiler, and files containing higher level code that may be executed by the computer using an interpreter.
- the invention is not limited to such implementations, but instead would equally apply regardless of the context and system in which it is implemented.
- the operations described above may be used to enable dynamic assignment with respect to other mobility agents, such as Foreign Agents.
- the above-described invention may be stored on a disk drive, a hard drive, a floppy disk, a server computer, or a remotely networked computer. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.
Abstract
Description
Claims
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DE60323230D1 (en) | 2008-10-09 |
CA2489430A1 (en) | 2003-12-31 |
EP1520377B1 (en) | 2008-08-27 |
AU2003245659A1 (en) | 2004-01-06 |
US7290064B2 (en) | 2007-10-30 |
CN100591033C (en) | 2010-02-17 |
CN1663199A (en) | 2005-08-31 |
CA2489430C (en) | 2010-08-10 |
ATE406737T1 (en) | 2008-09-15 |
WO2004002090A3 (en) | 2004-03-25 |
US20030236827A1 (en) | 2003-12-25 |
EP1520377A2 (en) | 2005-04-06 |
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