Avoiding exposed node problems in wireless local area networks

A node and channel technology, applied in the direction of radio/inductive link selection arrangement, selection device, etc., can solve problems such as adjacent interference

Inactive Publication Date: 2008-08-20
AVAYA TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The source and destination of the transmission send RTS and CTS control frames respectively containing the reserved duration, resulting in proximity interference

Method used

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  • Avoiding exposed node problems in wireless local area networks
  • Avoiding exposed node problems in wireless local area networks
  • Avoiding exposed node problems in wireless local area networks

Examples

Experimental program
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Embodiment Construction

[0017] Traditional wireless networks may use the Common Control (CCC) protocol for Media Access Control. The CCC protocol is a MAC protocol that extends the IEEE 802.11 distributed MAC protocol to enable the use of multiple channels within a BSS or mesh network. The CCC protocol defines a flexible channel access architecture based on media access based on distributed priority contention. The CCC protocol distinguishes between two logical channel functions - Control Channel (CC) and Data Channel (DC). In the following description, a station or mesh point following the CCC MAC protocol is called a "node". Nodes exchange control and management frames on the control channel. The data channel carries data traffic.

[0018] Reservations for transmissions on the respective data channels are made by exchanging control frames on the control channels. As an extension of inherited RTS and CTS messages, CC-RTS and CC-CTS are used to make the data channel reserve the time used for send...

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Abstract

A method, device and computer program product for avoiding exposed nodes in a wireless local area network are presented. The method comprises maintaining at a node a first timer (NAV_RTS) of a channel which, if set, prevents the node from authorizing itself to transmit on the channel ; maintaining at the node a second timer (NAV_CTS) for the channel that, if set, prevents the node from transmitting on the channel. The method also includes updating the NAV_RTS when receiving a transmission request (CC-RTS) frame having a reservation duration value greater than zero and greater than the current value of the NAV_RTS; The NAV_CTS is updated when the transmission response (CC-CTS) frame of the reserved duration value of the current value of the NAV_CTS is received.

Description

Background technique [0001] Wireless local area networks (WLANs) have become ubiquitous. Typically, for wireless communications in a WLAN a single channel is used, and in other communications the WLAN is accessed through a distributed MAC protocol. [IEEE 802.11 Standard] A WLAN may include multiple channels and multiple radios. A method of providing both multiple channels and multiple radio capabilities is presented in co-pending patent application entitled "A Protocol For Wireless Multi-Channel Access Control," Attorney Docket No. AVA06-01, filed March 29, 2006 , the disclosure of which is hereby incorporated by reference, describes the CCC (Common Control Channel) MAC protocol. CCC uses two types of logical channels - control channels and data channels. [0002] In a wireless local area network (LAN), while using an asynchronous distributed random channel access method, a wireless channel can be reserved for frame sequence transmission. In such an environment, both the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/24
Inventor 玛斯尔德·本维尼斯特
Owner AVAYA TECH LLC
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