WO2007127312A2 - High-throughput channel operation in a mesh wireless local area network - Google Patents

High-throughput channel operation in a mesh wireless local area network Download PDF

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Publication number
WO2007127312A2
WO2007127312A2 PCT/US2007/010149 US2007010149W WO2007127312A2 WO 2007127312 A2 WO2007127312 A2 WO 2007127312A2 US 2007010149 W US2007010149 W US 2007010149W WO 2007127312 A2 WO2007127312 A2 WO 2007127312A2
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WO
WIPO (PCT)
Prior art keywords
mesh
mesh network
points
network
channel
Prior art date
Application number
PCT/US2007/010149
Other languages
French (fr)
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WO2007127312A3 (en
Inventor
Marian Rudolf
Juan Carlos Zuniga
Joseph S. Levy
Sudheer A. Grandhi
Original Assignee
Interdigital Technology Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR20147030827A priority Critical patent/KR20140133966A/en
Priority to AT07756066T priority patent/ATE469482T1/en
Application filed by Interdigital Technology Corporation filed Critical Interdigital Technology Corporation
Priority to KR1020127017050A priority patent/KR101274346B1/en
Priority to MYPI20093475A priority patent/MY145478A/en
Priority to KR1020137005559A priority patent/KR101517705B1/en
Priority to BRPI0710388-3A priority patent/BRPI0710388A2/en
Priority to DE602007006785T priority patent/DE602007006785D1/en
Priority to JP2009507803A priority patent/JP4751947B2/en
Priority to CA2650436A priority patent/CA2650436C/en
Priority to KR1020137022339A priority patent/KR101517710B1/en
Priority to EP07756066A priority patent/EP2016709B1/en
Priority to KR1020127027479A priority patent/KR101326328B1/en
Priority to AU2007243313A priority patent/AU2007243313B2/en
Priority to MX2008013679A priority patent/MX2008013679A/en
Priority to KR1020147005716A priority patent/KR101517740B1/en
Publication of WO2007127312A2 publication Critical patent/WO2007127312A2/en
Publication of WO2007127312A3 publication Critical patent/WO2007127312A3/en
Priority to IL194644A priority patent/IL194644A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0806—Configuration setting for initial configuration or provisioning, e.g. plug-and-play
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0813—Configuration setting characterised by the conditions triggering a change of settings
    • H04L41/082—Configuration setting characterised by the conditions triggering a change of settings the condition being updates or upgrades of network functionality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/084—Configuration by using pre-existing information, e.g. using templates or copying from other elements
    • H04L41/0843—Configuration by using pre-existing information, e.g. using templates or copying from other elements based on generic templates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/084—Configuration by using pre-existing information, e.g. using templates or copying from other elements
    • H04L41/0846—Configuration by using pre-existing information, e.g. using templates or copying from other elements based on copy from other elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/085—Retrieval of network configuration; Tracking network configuration history
    • H04L41/0853—Retrieval of network configuration; Tracking network configuration history by actively collecting configuration information or by backing up configuration information
    • H04L41/0856—Retrieval of network configuration; Tracking network configuration history by actively collecting configuration information or by backing up configuration information by backing up or archiving configuration information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/12—Discovery or management of network topologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0817—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking functioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/02—Standardisation; Integration
    • H04L41/0213—Standardised network management protocols, e.g. simple network management protocol [SNMP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Definitions

  • the present invention is related to wireless local area networks
  • WLANs More specifically, the present invention is related to high throughput channel operation in a mesh WLAN.
  • IEEE 802.1 Is is a draft specification for providing a means to form a mesh wireless backhaul with IEEE 802.11 WLAN technology.
  • Mesh networks are also known as multi-hop networks, since data packets may be relayed more than once in order to reach their destination. This presents a different paradigm as compared to the original WLAN standard, which addresses only star topologies for stations (STAs) to be connected to an access point (AP) effectively using single hop communications through a basic service set (BSS).
  • STAs stations
  • AP access point
  • BSS basic service set
  • IEEE 802.11s only addresses network nodes that form a mesh network and the WLAN mesh operation in the backhaul that is transparent to all STAs.
  • STAs still connect to an AP, (i.e., mesh AP having a mesh capability), through a BSS.
  • the mesh AP interfaces on its backhaul side to other mesh points which forward and route traffic through the mesh network to a destination.
  • the destination may be a mesh portal which routes the traffic to the external network or may be another mesh AP attached to the mesh network.
  • legacy STAs may still operate in a mesh-enabled WLAN.
  • the communication between STAs and a mesh AP in a BSS is completely independent from the mesh network. The STAs are unaware of the presence of the mesh network in the backhaul.
  • the IEEE 802.11s WLAN mesh standard has been designed under the assumption that legacy IEEE 802.11a/b/g radio interface may be implemented on the mesh points.
  • the IEEE 802.11s standard is mostly radio interface agnostic. For example, routing and forwarding of data packets are not dependent on the particularities of an IEEE 802. lla/b/g radio interfaces, (such as modulation scheme or channel coding).
  • IEEE 802.11s also allows different ways for simultaneous multichannel operation.
  • One way to implement multi-channel operation is to use multiple IEEE 802.11 radio devices on a mesh point in order to increase the available data throughput capability.
  • Another possibility is to use a single radio device, (so-called common channel framework (CCF)), for more than one channel.
  • CCF common channel framework
  • IEEE 802. Hn specification is another specification for providing a high throughput (HT) WLAN.
  • Some of the IEEE 802.Hn throughput-enhancing features are aggregation, enhanced block acknowledgement (BA), reverse direction grant, power save multiple poll (PSMP), and operational bandwidth.
  • BA enhanced block acknowledgement
  • PSMP power save multiple poll
  • a data rate is increased by annexing or bonding two adjacent channels.
  • the data rate increase is also achieved by using several more data tones with 802.11 40 MHz operation relative to 2x20 MHz channel occupancy with 802.Ha/g.
  • 802.Hn devices may support 40 MHz operation and, therefore, the transition of operation from 20 MHz to 40 MHz should be managed efficiently.
  • the IEEE 802.Hn standard provides some channel management mechanisms.
  • IEEE802.11n three operating modes are allowed according to bandwidth and BSS capability: 20 MHz operation, 20/40 MHz operation and Phased Coexistence Operation (PCO). Each of these modes has associated rules of operation. In a 20 MHz operation, all STAs will operate only in a 20 MHz mode whether or not the STAs are 20 MHz or 20/40 MHz capable.
  • STAs choose the bandwidth by using a transmission channel width action message.
  • a 40 MHz device will protect its transmission with legacy control frames such as request-to-send (RTS) or clear-to-send (CTS) frames, if the AP of its BSS indicates that there are 20 MHz and/or legacy STAs in the BSS.
  • RTS request-to-send
  • CTS clear-to-send
  • the BSS alternates between 20 MHz and 40 MHz modes.
  • the IEEE 802.Hs WLAN mesh standard attempts to remain radio agnostic to the largest extent possible
  • integration of an IEEE 802. Hn high-throughput radio instead of an 802.11a/b/g, still poses several problems. For example, unlike previous IEEE 802.Ha/b/g systems that operate only in 20 MHz bandwidth, IEEE 802.Hn operates in both 20 MHz and 40 MHz bandwidths.
  • EDCA Enhanced Distributed Channel Access
  • IEEE 802. Hn uses a slightly altered sub-carrier configuration when using full 40 MHz mode, (i.e., using a higher number of data tones when operating in 40 MHz mode compared to dual channel 2x20 MHz 802.Ha radios). Dual 2x20 MHz channel operation is also possible for coexistence with legacy radios.
  • IEEE 802.Hs technology only allows orthogonal frequency division multiplexing (OFDM) parameters to be communicated to advertise current channel identification to neighbor MPs
  • OFDM orthogonal frequency division multiplexing
  • the use of IEEE 802. Hn radios in an IEEE 802.Hs WLAN mesh networks is severely limited due to the limitation with legacy 20 MHz mode even if an IEEE 802. Hn radio is used.
  • Another problem with the current IEEE 802.11s WLAN mesh networks is the set-up and configuration of a particular mesh link, a neighborhood in the mesh or the entire mesh network with respect to high- throughput channelization modes and configurations to be used.
  • the present invention is related to high throughput channel operation in a mesh WLAN.
  • a mesh network comprises a plurality of mesh points and a network management entity (NME).
  • the NME is configured to retrieve capability and configuration data from the mesh points.
  • the NME configures at least one mesh point with respect to IEEE 802. Hn channelization and legacy protection mode based on the capability and configuration data.
  • Figure 1 is a diagram of a mesh network in accordance with the present invention.
  • STA includes but is not limited to a wireless transmit/receive unit (WTRU), a user equipment (UE), a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment.
  • WTRU wireless transmit/receive unit
  • UE user equipment
  • PDA personal digital assistant
  • AP includes but is not limited to a Node-B, a site controller, a base station, or any other type of interfacing device capable of operating in a wireless environment.
  • Figure 1 is a diagram of a mesh network 100 in accordance with the present invention.
  • the mesh network 100 comprises a plurality of mesh points 102-118.
  • the mesh network 100 may include a mesh portal 102.
  • the mesh portal 102 is a mesh point that has a connection with an external network, (e.g., a wired network).
  • Some of the mesh points may be mesh APs 112-118.
  • Each of the mesh APs 112-118 is a mesh point that also works as an AP in its own BSS 132-138.
  • the mesh AP 112-118 acts as a non-mesh AP to serve STAs 120-126 in its BSS, and on the other side, the mesh AP 112-118 acts as a wireless bridge to receive, forward and route packets through the mesh network 100.
  • An NME 140 is provided to the mesh network 100.
  • the NME 140 may be included in one or more mesh points 102-118 in the mesh network 100.
  • Figure 1 shows only one NME 140 located in mesh point 104.
  • the NME may be located in any mesh point 102-118 and more than one NME may be provided to the mesh network 100.
  • the NME 140 may be located out of the mesh network 100 and communicate with the mesh network 100 through the mesh portal 102.
  • at least one mesh point is IEEE 802.1 In-capable.
  • the NME 140 retrieves capability and configuration data from the mesh points 102-118 and configures the mesh points 102-118 with respect to IEEE 802. Hn channelization mode, (i.e., 20 MHz, 2x20 MHz, or 40 MHz), legacy protection mode and any other configuration for a particular mesh link, a particular mesh point, a subset of mesh points in the mesh network 100, or the entire mesh network 100.
  • the mesh points 102-118 may be divided into subsets based on a particular link or any other logical criteria.
  • the NME 140 configures the mesh points in the vicinity of such mesh points and STAs to use legacy physical layer transmission format, (e.g., legacy RTS/CTS frames), to precede any transmissions from IEEE 802.1 In-based mesh points.
  • legacy physical layer transmission format e.g., legacy RTS/CTS frames
  • a mesh point using a 40 MHz bandwidth i.e., an MP using IEEE 802.
  • Hn physical layer transmission format will protect its transmission with legacy control frames, such as request-to-send (RTS) or clear-to-send (CTS) frames.
  • RTS request-to-send
  • CTS clear-to-send
  • Table 1 Exemplary capability and configuration data that may be retrieved by the NME 140 is shown in Table 1.
  • the NME 140 configures the mesh points 102-118 such that either the mesh network lOOis coherent and similar capabilities are supported across the whole mesh network 100 to support the minimirm common parameter, or at least peer mesh points in a particular wireless link are configured coherently.
  • the capability and configuration data of the mesh points 102-118 may be stored in a data base in a mesh point 102-118, or in the NME 140. Alternatively, the database may reside outside the mesh network 100.
  • the NME 140 may request the capability and configuration data from the mesh points 102-118 during the association process, or shortly after the mesh point 102-118 undergoes an association process with the mesh network 100. The retrieval of the capability and configuration data may be a part of the association process, or may be performed separately.
  • the mesh points 102-118 may send the capability and configuration data in response to a request from the NME 140. Alternatively, the mesh points 102-118 may report the capability and configuration data to the NME 140 without solicitation from the NME 140. Polling may be used to trigger the reporting of the capability and configuration data.
  • the NME 140 configures all or part of the mesh network 100 with respect to IEEE 802.11n channelization mode, (i.e., 20 MHz, 2x20 MHz, or 40 MHz), configuration, and legacy protection mode based on the capability and configuration data collected from the mesh points 102-118.
  • the configuration may be coupled to a timer such that the configuration is valid for only a certain period of time. The timer may be triggered by a certain event, such as detection of a legacy STA.
  • the configuration may be updated periodically.
  • the NME 140 may configure a particular mesh link, a set of mesh links, a subset of mesh points, or the entire mesh network.
  • the current configuration data (i.e., IEEE 802.
  • Hn channelization mode, legacy protection mode, capability support, capability settings, configured conditions, (e.g., timers or events), and the like), of the mesh points 102-118 may be stored in a database, (e.g., management information base (MIB)), on the mesh points 102-118 or the NME 140.
  • the NME 140 may configure the mesh points 102-118 using a dedicated message exchange. Alternatively, the NME 140 may use multicast or broadcast messages to configure the mesh points 102-118.
  • the signalling for the configuration may be performed using a conventional network signaling protocol at any layer of the protocol processing stack. For example, a simple network management protocol (SNMP) over user datagram protocol (UDP) over Internet Protocol (IP) may be used. Alternatively, layer 2 (L2) signalling frames of Eithertype or IEEE 802.3 or 802.11 type may be used.
  • SNMP simple network management protocol
  • UDP user datagram protocol
  • IP Internet Protocol
  • L2 layer 2
  • IEEE 802.1 In capable devices may use the 40 MHz option occupying another 20 MHz channel, (i.e., extension channel). In such case, a channel collision may occur on the extension channel.
  • the IEEE 802.1 In-capable mesh points may block the extension channel for the 40 MHz operation from their channel map either by statically, semi-dynamically, or dynamically.
  • the extension channel is marked as unavailable for IEEE 802.1 In-capable mesh points during the start-up configuration. This may be pre-configured, for instance, by the service provider, through a subscriber identity module (SIM)-card-like configuration, or through a software/driver download.
  • SIM subscriber identity module
  • the extension channel may be marked as unavailable by exchanging specific configuration information, (e.g., management frames, SNMP to MIB, or the like), between the IEEE 802.1 Incapable mesh points and other mesh points.
  • the extension channel may be set unavailable when collisions are detected. Collisions may be detected based on collected statistics.
  • SNMP and MIB are conventional and associated mechanisms that can be used. This configuration changes may happen when an IEEE 802.1 In-capable mesh point joins the mesh network.
  • the allowed, disallowed, or recommended channel or channel width configuration, legacy protection mode may be communicated between the mesh points during the association process.
  • the extension channel may be blocked in real-time and for a limited time, (e.g., channel coordination window, or a specific period), by exchanging control or management frames.
  • a mesh point wishing to use the extension channel may send a control frame marking the extension channel as used for the current period.
  • a mesh point wishing to block the extension channel from being used by the IEEE 802.1 In-capable mesh points may send control or management frames to other mesh points, (for example, when a collision is detected on the extension channel).
  • a new control frame may be defined to declare collision in the extension channel.
  • a conventional congestion control message may be used for this purpose.
  • mesh points may communicate through L2 messages their intention to use 20 MHz, 2x20 MHz, or 40 MHz operation to neighboring mesh points, a subset of the mesh points in the mesh network, or the entire mesh network that they intend to use a particular channel configuration, legacy protection mode during the upcoming TXOP, channel access window, or allocated channel access time.
  • the L2 messages may be unicast, multicast or broadcast messages.
  • the message may be management frames, control-frames, or any other type of frames.
  • the L2 messages may be used either shortly preceding a channel access attempt, (such as when MRTS/MCTS is used), or be part of signalling frames exchanged during the channel access itself.
  • Mesh points may periodically send information about anticipated, advertised, or observed channel configuration through L2 messages to one or more neighboring mesh points, a subset of mesh points in the mesh network, or the entire mesh network. For example, a mesh point may inform one or more other mesh points that a particular channel configuration is valid for a particular
  • TXOP a period of time, or until occurrence of a certain event to another mesh point through the L2 messages.
  • a mesh point upon learning channel configuration of a particular neighbor mesh point either through configuration by the NME 140 or from message exchange with other mesh points of the mesh network, establishes a database which maps the mesh points to specific IEEE 802. Hn channelization mode, (i.e., 20 MHz, 2x20 MHz, or 40 MHz), configuration, and legacy protection mode.
  • the mesh point uses this database whenever the mesh point attempts to access a channel to choose an optimum channel and/or bandwidth.
  • the database may also be used to determine routing or forwarding paths through the mesh network.
  • a mesh network comprising a plurality of mesh points.
  • NME configured to retrieve capability and configuration data from the mesh points and configure at least one mesh point with respect to IEEE 802. Hn channelization and legacy protection mode based on the capability and configuration data.
  • ROM read only memory
  • RAM random access memory
  • register cache memory
  • semiconductor memory devices magnetic media such as internal hard disks and removable disks, magneto- optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
  • a processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer.
  • WTRU wireless transmit receive unit
  • UE user equipment
  • RNC radio network controller
  • the WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) module.
  • modules implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emit

Abstract

High throughput channel operation in a mesh wireless local area network (WLAN) is disclosed. A mesh network comprises a plurality of mesh points and a network management entity (NME). The NME is configured to retrieve capability and configuration data from the mesh points. The NME configures at least one mesh point with respect to IEEE 802.11n channelization and legacy protection mode based on the capability and configuration data.

Description

[0001] HIGH-THROUGHPUT CHANNEL OPERATION
IN A MESH WIRELESS LOCAL AREA NETWORK
[0001] FIELD OF INVENTION
[0002] The present invention is related to wireless local area networks
(WLANs). More specifically, the present invention is related to high throughput channel operation in a mesh WLAN.
[0003] BACKGROUND
[0004] IEEE 802.1 Is is a draft specification for providing a means to form a mesh wireless backhaul with IEEE 802.11 WLAN technology. Mesh networks are also known as multi-hop networks, since data packets may be relayed more than once in order to reach their destination. This presents a different paradigm as compared to the original WLAN standard, which addresses only star topologies for stations (STAs) to be connected to an access point (AP) effectively using single hop communications through a basic service set (BSS). [0005] IEEE 802.11s only addresses network nodes that form a mesh network and the WLAN mesh operation in the backhaul that is transparent to all STAs. This means that, similar to legacy IEEE 802.11 WLAN, STAs still connect to an AP, (i.e., mesh AP having a mesh capability), through a BSS. The mesh AP interfaces on its backhaul side to other mesh points which forward and route traffic through the mesh network to a destination. The destination may be a mesh portal which routes the traffic to the external network or may be another mesh AP attached to the mesh network. By choosing this approach, even legacy STAs may still operate in a mesh-enabled WLAN. The communication between STAs and a mesh AP in a BSS is completely independent from the mesh network. The STAs are unaware of the presence of the mesh network in the backhaul. [0006] The IEEE 802.11s WLAN mesh standard has been designed under the assumption that legacy IEEE 802.11a/b/g radio interface may be implemented on the mesh points. The IEEE 802.11s standard is mostly radio interface agnostic. For example, routing and forwarding of data packets are not dependent on the particularities of an IEEE 802. lla/b/g radio interfaces, (such as modulation scheme or channel coding).
[0007] IEEE 802.11s also allows different ways for simultaneous multichannel operation. One way to implement multi-channel operation is to use multiple IEEE 802.11 radio devices on a mesh point in order to increase the available data throughput capability. Another possibility is to use a single radio device, (so-called common channel framework (CCF)), for more than one channel. [0008] IEEE 802. Hn specification is another specification for providing a high throughput (HT) WLAN. Some of the IEEE 802.Hn throughput-enhancing features are aggregation, enhanced block acknowledgement (BA), reverse direction grant, power save multiple poll (PSMP), and operational bandwidth. In IEEE 802. Hn, a data rate is increased by annexing or bonding two adjacent channels. The data rate increase is also achieved by using several more data tones with 802.11 40 MHz operation relative to 2x20 MHz channel occupancy with 802.Ha/g. However, not all IEEE 802.Hn devices may support 40 MHz operation and, therefore, the transition of operation from 20 MHz to 40 MHz should be managed efficiently. In order to achieve this, the IEEE 802.Hn standard provides some channel management mechanisms. [0009] In IEEE802.11n, three operating modes are allowed according to bandwidth and BSS capability: 20 MHz operation, 20/40 MHz operation and Phased Coexistence Operation (PCO). Each of these modes has associated rules of operation. In a 20 MHz operation, all STAs will operate only in a 20 MHz mode whether or not the STAs are 20 MHz or 20/40 MHz capable. In a 20/40 MHz operation, STAs choose the bandwidth by using a transmission channel width action message. In addition, a 40 MHz device will protect its transmission with legacy control frames such as request-to-send (RTS) or clear-to-send (CTS) frames, if the AP of its BSS indicates that there are 20 MHz and/or legacy STAs in the BSS. In the PCO mode, which is an optional mechanism, the BSS alternates between 20 MHz and 40 MHz modes. [0010] Although the IEEE 802.Hs WLAN mesh standard attempts to remain radio agnostic to the largest extent possible, integration of an IEEE 802. Hn high-throughput radio, instead of an 802.11a/b/g, still poses several problems. For example, unlike previous IEEE 802.Ha/b/g systems that operate only in 20 MHz bandwidth, IEEE 802.Hn operates in both 20 MHz and 40 MHz bandwidths.
[0011] With Enhanced Distributed Channel Access (EDCA)-based mesh channel access mode, when a mesh point contends and gets an access to the channel, mesh points on a particular link or in a neighborhood have to agree either before the channel access or during the channel access about the specifics of the channelization scheme to be used, (i.e., 20 MHz vs. 40 MHz). Moreover, IEEE 802. Hn uses a slightly altered sub-carrier configuration when using full 40 MHz mode, (i.e., using a higher number of data tones when operating in 40 MHz mode compared to dual channel 2x20 MHz 802.Ha radios). Dual 2x20 MHz channel operation is also possible for coexistence with legacy radios. Because current IEEE 802.Hs technology only allows orthogonal frequency division multiplexing (OFDM) parameters to be communicated to advertise current channel identification to neighbor MPs, the use of IEEE 802. Hn radios in an IEEE 802.Hs WLAN mesh networks is severely limited due to the limitation with legacy 20 MHz mode even if an IEEE 802. Hn radio is used. [0012] Another problem with the current IEEE 802.11s WLAN mesh networks is the set-up and configuration of a particular mesh link, a neighborhood in the mesh or the entire mesh network with respect to high- throughput channelization modes and configurations to be used. For example, it is currently not possible to prevent or allow the use of 40 MHz access in either version (full 40 MHz or 2x20 MHz) on a particular link, in a mesh neighborhood, or for the entire mesh. This is a limitation with the current IEEE 802.Hs technology in the sense that it constitutes an obstacle towards efficient use of 802.Hn radios and all the proposed IEEE 802.11n enhancements with WLAN mesh technology.
[0013] Therefore, it would be desirable to have a scheme to overcome the above shortcomings and allow efficient integration of IEEE 802. Hn radios into IEEE 802.11s WLAN mesh networks.
[0014] SUMMARY
[0015] The present invention is related to high throughput channel operation in a mesh WLAN. A mesh network comprises a plurality of mesh points and a network management entity (NME). The NME is configured to retrieve capability and configuration data from the mesh points. The NME configures at least one mesh point with respect to IEEE 802. Hn channelization and legacy protection mode based on the capability and configuration data.
[0016] BRIEF DESCRIPTION OF THE DRAWING
[0017] A more detailed understanding of the invention may be had from the following description of a preferred embodiment, given by way of example and to be understood in conjunction with the accompanying drawing wherein:
[0018] Figure 1 is a diagram of a mesh network in accordance with the present invention.
[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0020] When referred to hereafter, the terminology "STA" includes but is not limited to a wireless transmit/receive unit (WTRU), a user equipment (UE), a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment. When referred to hereafter, the terminology "AP" includes but is not limited to a Node-B, a site controller, a base station, or any other type of interfacing device capable of operating in a wireless environment. [0021] Figure 1 is a diagram of a mesh network 100 in accordance with the present invention. The mesh network 100 comprises a plurality of mesh points 102-118. The mesh network 100 may include a mesh portal 102. The mesh portal 102 is a mesh point that has a connection with an external network, (e.g., a wired network). Some of the mesh points may be mesh APs 112-118. Each of the mesh APs 112-118 is a mesh point that also works as an AP in its own BSS 132-138. On one side, the mesh AP 112-118 acts as a non-mesh AP to serve STAs 120-126 in its BSS, and on the other side, the mesh AP 112-118 acts as a wireless bridge to receive, forward and route packets through the mesh network 100. An NME 140 is provided to the mesh network 100. The NME 140 may be included in one or more mesh points 102-118 in the mesh network 100. For illustration purposes, Figure 1 shows only one NME 140 located in mesh point 104. However, the NME may be located in any mesh point 102-118 and more than one NME may be provided to the mesh network 100. Alternatively, the NME 140 may be located out of the mesh network 100 and communicate with the mesh network 100 through the mesh portal 102. Among the mesh points 102-118, at least one mesh point is IEEE 802.1 In-capable.
[0022] The NME 140 retrieves capability and configuration data from the mesh points 102-118 and configures the mesh points 102-118 with respect to IEEE 802. Hn channelization mode, (i.e., 20 MHz, 2x20 MHz, or 40 MHz), legacy protection mode and any other configuration for a particular mesh link, a particular mesh point, a subset of mesh points in the mesh network 100, or the entire mesh network 100. The mesh points 102-118 may be divided into subsets based on a particular link or any other logical criteria. For example, if the NME 140 knows from capability and configuration data from the mesh points 102-118 that there is one or more mesh points that use the legacy physical layer transmission format, (e.g., IEEE 802.11a/b/g), and/or legacy STAs in the mesh network 100 or a subset of the mesh network 100, the NME 140 configures the mesh points in the vicinity of such mesh points and STAs to use legacy physical layer transmission format, (e.g., legacy RTS/CTS frames), to precede any transmissions from IEEE 802.1 In-based mesh points. For example, a mesh point using a 40 MHz bandwidth, (i.e., an MP using IEEE 802. Hn physical layer transmission format), will protect its transmission with legacy control frames, such as request-to-send (RTS) or clear-to-send (CTS) frames. [0023] Exemplary capability and configuration data that may be retrieved by the NME 140 is shown in Table 1. The NME 140 configures the mesh points 102-118 such that either the mesh network lOOis coherent and similar capabilities are supported across the whole mesh network 100 to support the minimirm common parameter, or at least peer mesh points in a particular wireless link are configured coherently.
Figure imgf000007_0001
Table 1
[0024] The capability and configuration data of the mesh points 102-118 may be stored in a data base in a mesh point 102-118, or in the NME 140. Alternatively, the database may reside outside the mesh network 100. [0025] The NME 140 may request the capability and configuration data from the mesh points 102-118 during the association process, or shortly after the mesh point 102-118 undergoes an association process with the mesh network 100. The retrieval of the capability and configuration data may be a part of the association process, or may be performed separately. The mesh points 102-118 may send the capability and configuration data in response to a request from the NME 140. Alternatively, the mesh points 102-118 may report the capability and configuration data to the NME 140 without solicitation from the NME 140. Polling may be used to trigger the reporting of the capability and configuration data.
[0026] The NME 140 configures all or part of the mesh network 100 with respect to IEEE 802.11n channelization mode, (i.e., 20 MHz, 2x20 MHz, or 40 MHz), configuration, and legacy protection mode based on the capability and configuration data collected from the mesh points 102-118. The configuration may be coupled to a timer such that the configuration is valid for only a certain period of time. The timer may be triggered by a certain event, such as detection of a legacy STA. The configuration may be updated periodically. The NME 140 may configure a particular mesh link, a set of mesh links, a subset of mesh points, or the entire mesh network. The current configuration data, (i.e., IEEE 802. Hn channelization mode, legacy protection mode, capability support, capability settings, configured conditions, (e.g., timers or events), and the like), of the mesh points 102-118 may be stored in a database, (e.g., management information base (MIB)), on the mesh points 102-118 or the NME 140. [0027] The NME 140 may configure the mesh points 102-118 using a dedicated message exchange. Alternatively, the NME 140 may use multicast or broadcast messages to configure the mesh points 102-118. The signalling for the configuration may be performed using a conventional network signaling protocol at any layer of the protocol processing stack. For example, a simple network management protocol (SNMP) over user datagram protocol (UDP) over Internet Protocol (IP) may be used. Alternatively, layer 2 (L2) signalling frames of Eithertype or IEEE 802.3 or 802.11 type may be used.
[0028] IEEE 802.1 In capable devices may use the 40 MHz option occupying another 20 MHz channel, (i.e., extension channel). In such case, a channel collision may occur on the extension channel. In order to avoid channel collision, the IEEE 802.1 In-capable mesh points may block the extension channel for the 40 MHz operation from their channel map either by statically, semi-dynamically, or dynamically.
[0029] For the static configuration, the extension channel is marked as unavailable for IEEE 802.1 In-capable mesh points during the start-up configuration. This may be pre-configured, for instance, by the service provider, through a subscriber identity module (SIM)-card-like configuration, or through a software/driver download.
[0030] For the semi-dynamic configuration, the extension channel may be marked as unavailable by exchanging specific configuration information, (e.g., management frames, SNMP to MIB, or the like), between the IEEE 802.1 Incapable mesh points and other mesh points. The extension channel may be set unavailable when collisions are detected. Collisions may be detected based on collected statistics. By way of example, SNMP and MIB are conventional and associated mechanisms that can be used. This configuration changes may happen when an IEEE 802.1 In-capable mesh point joins the mesh network. Alternatively, the allowed, disallowed, or recommended channel or channel width configuration, legacy protection mode may be communicated between the mesh points during the association process.
[0031] For the dynamic configuration, the extension channel may be blocked in real-time and for a limited time, (e.g., channel coordination window, or a specific period), by exchanging control or management frames. For example, a mesh point wishing to use the extension channel may send a control frame marking the extension channel as used for the current period. [0032] A mesh point wishing to block the extension channel from being used by the IEEE 802.1 In-capable mesh points may send control or management frames to other mesh points, (for example, when a collision is detected on the extension channel). For this purpose, a new control frame may be defined to declare collision in the extension channel. Alternatively, a conventional congestion control message may be used for this purpose.
[0033] Similarly and for both the CCF and the EDCA-based mesh access modes, mesh points may communicate through L2 messages their intention to use 20 MHz, 2x20 MHz, or 40 MHz operation to neighboring mesh points, a subset of the mesh points in the mesh network, or the entire mesh network that they intend to use a particular channel configuration, legacy protection mode during the upcoming TXOP, channel access window, or allocated channel access time. [0034] The L2 messages may be unicast, multicast or broadcast messages.
The message may be management frames, control-frames, or any other type of frames. The L2 messages may be used either shortly preceding a channel access attempt, (such as when MRTS/MCTS is used), or be part of signalling frames exchanged during the channel access itself.
[0035] Mesh points may periodically send information about anticipated, advertised, or observed channel configuration through L2 messages to one or more neighboring mesh points, a subset of mesh points in the mesh network, or the entire mesh network. For example, a mesh point may inform one or more other mesh points that a particular channel configuration is valid for a particular
TXOP, a period of time, or until occurrence of a certain event to another mesh point through the L2 messages.
[0036] A mesh point, upon learning channel configuration of a particular neighbor mesh point either through configuration by the NME 140 or from message exchange with other mesh points of the mesh network, establishes a database which maps the mesh points to specific IEEE 802. Hn channelization mode, (i.e., 20 MHz, 2x20 MHz, or 40 MHz), configuration, and legacy protection mode. The mesh point uses this database whenever the mesh point attempts to access a channel to choose an optimum channel and/or bandwidth. The database may also be used to determine routing or forwarding paths through the mesh network.
[0037] Embodiments.
[0038] 1. A mesh network comprising a plurality of mesh points.
[0039] 2. The mesh network of embodiment 1 further comprising an
NME configured to retrieve capability and configuration data from the mesh points and configure at least one mesh point with respect to IEEE 802. Hn channelization and legacy protection mode based on the capability and configuration data.
[0040] 3. The mesh network of embodiment 2 wherein the capability and configuration data includes information regarding at least one of PHY level spoofing. [0041] 4. The mesh network as in any one of embodiments 2-3, wherein the capability and configuration data includes information regarding mechanisms to manage coexistence of 20 MHz and 40 MHz channels.
[0042] 5. The mesh network as in any one of embodiments 2-4, wherein the capability and configuration data includes information regarding management and channel selection methods.
[0043] 6. The mesh network as in any one of embodiments 2-5, wherein the capability and configuration data includes information regarding RIFS protection.
[0044] 7. The mesh network as in any one of embodiments 2-6, wherein the capability and configuration data includes information regarding green field protection.
[0045] 8. The mesh network as in any one of embodiments 2-7, wherein the capability and configuration data includes information regarding STBC control frames.
[0046] 9. The mesh network as in any one of embodiments 2-8, wherein the capability and configuration data includes information regarding L-SIG
TXOP protection.
[0047] 10. The mesh network as in any one of embodiments 2-9, wherein the capability and configuration data includes information regarding PCO.
[0048] 11. The mesh network as in any one of embodiments 2-10, wherein the capability and configuration data of the mesh points is stored in a data base in the mesh points.
[0049] 12. The mesh network as in any one of embodiments 2-10, wherein the capability and configuration data of the mesh points is stored in a database outside the mesh network.
[0050] 13. The mesh network as in any one of embodiments 2-12, wherein the capability and configuration data is retrieved from the mesh points during or after an association process.
[0051] 14. The mesh network as in any one of embodiments 2-13, wherein the NME sends a request to the mesh points for retrieving the capability and configuration data.
[0052] 15. The mesh network as in any one of embodiments 2-13, wherein the mesh points send the capability and configuration data in response to the request.
[0053] 16. The mesh network as in any one of embodiments 2-13, wherein the mesh points report the capability and configuration data to the NME without a request from the NME.
[0054] 17. The mesh network as in any one of embodiments 2-16, wherein configuration for the mesh points is coupled to a timer such that the configuration is valid for only a certain period of time.
[0055] 18. The mesh network of embodiment 17 wherein the timer is triggered by a predetermined event.
[0056] 19. The mesh network as in any one of embodiments 2-18, wherein configuration for the mesh points is updated periodically.
[0057] 20. The mesh network as in any one of embodiments 2-19, wherein the NME configures one of a particular mesh link.
[0058] 21. The mesh network as in any one of embodiments 2-19, wherein the NME configures a subset of the mesh points.
[0059] 22. The mesh network as in any one of embodiments 2-19, wherein the NME configures the entire mesh network.
[0060] 23. The mesh network as in any one of embodiments 2-22, wherein information regarding configuration of the mesh points is stored in a database on at least one of the NME and the mesh points.
[0061] 24. The mesh network as in any one of embodiments 2-23, wherein the NME configures the mesh points using a dedicated message exchange.
[0062] 25. The mesh network as in any one of embodiments 2-23, wherein the NME configures the mesh points using one of multicast messages and broadcast messages.
[0063] 26. The mesh network as in any one of embodiments 2-23, wherein the NME uses an SNMP to configure the mesh points. [0064] 27. The mesh, network as in any one of embodiments 2-23, wherein the NME uses L2 signalling frames to configure the mesh points.
[0065] 28. The mesh network as in any one of embodiments 2-27, wherein at least one mesh point blocks an extension channel for 40 MHz operation from its channel map.
[0066] 29. The mesh network of embodiment 28 wherein the extension channel is blocked statically during start-up configuration.
[0067] 30. The mesh network of embodiment of 28 wherein the extension channel is configured by a service provider.
[0068] 31. The mesh network of embodiment 28 wherein the extension channel is configured through a subscriber identity module (SIM)-card-like configuration.
[0069] 32. The mesh network of embodiment 28 wherein the extension channel is configured through a software/driver download.
[0070] 33. The mesh network of claim 28 wherein the extension channel is blocked semi-dynamically in accordance with a configuration message.
[0071] 34. The mesh network of embodiment 33 wherein the mesh points communicate information regarding channel configuration and legacy protection mode with another mesh points during an association process.
[0072] 35. The mesh network of embodiment 33 wherein the extension channel is blocked based on the information.
[0073] 36. The mesh network of embodiment 28 wherein the extension channel is blocked dynamically in real-time.
[0074] 37. The mesh network of embodiment 28 wherein the extension channel is blocked dynamically for a limited time.
[0075] 38. The mesh network of embodiment 28 wherein the mesh point blocks the extension channel based on a message from neighbor mesh points.
[0076] 39. The mesh network of embodiment 38 wherein a congestion control message is used for carrying the message.
[0077] 40. The mesh network of embodiment 38 wherein the mesh points communicate with each other through an L2 message. [0078] 41. The mesh network of embodiment 40 wherein the L2 message is a unicast message.
[0079] 42. The mesh network of embodiment 40 wherein the L2 message is a multicast message.
[0080] 43. The mesh network as in any one of embodiments 40-42, wherein the L2 may is one of a management frame and a control frame. [0081] 44. The mesh network as in any one of embodiments 40-43, wherein the L2 message is sent shortly preceding a channel access attempt. [0082] 45. The mesh network of embodiment 44 wherein the L2 message is sent as a part of signalling frames for channel access.
[0083] 46. The mesh network as in any one of embodiments 2-45, wherein the mesh points are configured to establish a database which maps mesh points in the mesh network to specific IEEE 802. Hn channelization and legacy protection mode.
[0084] 47. The mesh network of embodiment 46 wherein the mesh points use the database to choose an optimum channel and bandwidth. [0085] 48. The mesh network as in any one of embodiments 46-47, wherein the mesh points use the database to determine routing and forwarding paths through the mesh network.
[0086] Although the features and elements of the present invention are described in the preferred embodiments in particular combinations, each feature or element can be used alone without the other features and elements of the preferred embodiments or in various combinations with or without other features and elements of the present invention. The methods or flow charts provided in the present invention may be implemented in a computer program, software, or firmware tangibly embodied in a computer-readable storage medium for execution by a general purpose computer or a processor. Examples of computer- readable storage mediums include a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto- optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
[0087] Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine. [0088] A processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer. The WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) module.

Claims

CLAIMS What is claimed is:
1. A mesh network comprising: a plurality of mesh points; and a network management entity (NME) configured to retrieve capability and configuration data from the mesh points and configure at least one mesh point with respect to IEEE 802. Hn channelization and legacy protection mode based on the capability and configuration data.
2. The mesh network of claim 1 wherein the capability and configuration data includes information regarding at least one of physical (PHY) level spoofing, mechanisms to manage coexistence of 20 MHz and 40 MHz channels, channel management and channel selection methods, reduced inter- frame spacing (RIFS) protection, green field protection, space time block coding (STBC) control frame, legacy signal field (L-SIG) transmission opportunity (TXOP) protection, and phased coexistence operation (PCO).
3. The mesh network of claim 1 wherein the capability and configuration data of the mesh points is stored in a data base in the mesh points.
4. The mesh network of claim 1 wherein the capability and configuration data of the mesh points is stored in a database outside the mesh network.
5. The mesh network of claim 1 wherein the capability and configuration data is retrieved from the mesh points during or after an association process.
6. The mesh network of claim 1 wherein the NME sends a request to the mesh points for retrieving the capability and configuration data, wherein the mesh points send the capability and configuration data in response to the request.
7. The mesh network of claim 1 wherein the mesh points reports the capability and configuration data to the NME without a request from the NME.
8. The mesh network of claim 1 wherein configuration for the mesh points is coupled to a timer such that the configuration is valid for only a certain period of time.
9. The mesh network of claim 8 wherein the timer is triggered by a predetermined event.
10. The mesh network of claim 1 wherein configuration for the mesh points is updated periodically.
11. The mesh network of claim 1 wherein the NME configures at least one of a particular mesh link, a set of mesh links, a subset of the mesh points, and the entire mesh network.
12. The mesh network of claim 1 wherein information regarding configuration of the mesh points is stored in a database on at least one of the NME and the mesh points.
13. The mesh network of claim 1 wherein the NME configures the mesh points using a dedicated message exchange.
14. The mesh network of claim 1 wherein the NME configures the mesh points using at least one of multicast messages and broadcast messages.
15. The mesh network of claim 1 wherein the NME uses a simple network management protocol (SNMP) to configure the mesh points.
16. The mesh network of claim 1 wherein the NME uses layer 2 (L2) signalling frames to configure the mesh points.
17. The mesh network of claim 1 wherein at least one mesh point blocks an extension channel for 40 MHz operation from its channel map.
18. The mesh network of claim 17 wherein the extension channel is blocked statically during start-up configuration.
19. The mesh network of claim 18 wherein the extension channel is configured by a service provider.
20. The mesh network of claim 18 wherein the extension channel is configured through a subscriber identity module (SIM)-card-like configuration.
21. The mesh network of claim 18 wherein the extension channel is configured through a software/driver download.
22. The mesh network of claim 17 wherein the extension channel is blocked semi-dynamically in accordance with a configuration message.
23. The method of claim 22 wherein the mesh points communicate information regarding channel configuration and legacy protection mode with at least one other mesh point during an association process and the extension channel is blocked based on the information.
24. The mesh network of claim 17 wherein the extension channel is blocked dynamically in real-time.
25. The mesh network of claim 17 wherein the extension channel is blocked dynamically for a limited time.
26. The mesh network of claim 17 wherein the mesh point blocks the extension channel based on messages from neighbor mesh points.
27. The mesh network of claim 26 wherein a congestion control message is used for carrying the message.
28. The mesh network of claim 26 wherein the mesh points communicate with each other through a layer 2 (L2) message.
29. The mesh network of claim 28 wherein the L2 message is a unicast message.
30. The mesh network of claim 28 wherein the L2 message is one of a multicast message or a broadcast message.
31. The mesh network of claim 28 wherein the L2 message is a management frame.
32. The mesh network of claim 28 wherein the L2 message is a control frame.
33. The mesh network of claim 28 wherein the L2 message is sent shortly preceding a channel access attempt.
34. The mesh network of claim 28 wherein the L2 message is sent as a part of signalling frames for channel access.
35. The mesh network of claim 1 wherein the mesh points are configured to establish a database which maps mesh points in the mesh network to a specific IEEE 802. Hn channelization and legacy protection mode.
36. The mesh network of claim 35 wherein the mesh points use the database to choose an optimum channel and bandwidth.
37. The mesh network of claim 35 wherein the mesh points use the database to determine routing and forwarding paths through the mesh network.
38. The mesh network of claim 1 wherein the mesh points are configured to establish a database which maps mesh points in the mesh network to specific IEEE 802. Hn channelization and legacy protection mode.
39. The mesh network of claim 38 wherein the mesh points use the database to choose an optimum channel and bandwidth.
40. The mesh network of claim 38 wherein the mesh points use the database to determine routing and forwarding paths through the mesh network.
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AT07756066T ATE469482T1 (en) 2006-04-25 2007-04-24 HIGH-THROUGHPUT CHANNEL OPERATION IN A MESH WLAN
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