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A grouping method that can avoid hidden terminals in wireless local area network

A wireless local area network and hidden terminal technology, which is applied in the field of wireless local area network communication systems, can solve problems such as inaccurate channel monitoring results, and achieve the effects of shortening channel access delay, alleviating hidden conflicts, and accurate monitoring

Active Publication Date: 2020-10-16
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing hidden terminal monitoring schemes assume that the channel is an ideal channel. In the actual network environment, factors such as channel errors, noise, and propagation delay will cause inaccurate monitoring results.

Method used

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  • A grouping method that can avoid hidden terminals in wireless local area network
  • A grouping method that can avoid hidden terminals in wireless local area network
  • A grouping method that can avoid hidden terminals in wireless local area network

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Embodiment Construction

[0026] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0027] The present invention is as follows:

[0028] A hidden relationship monitoring method based on frame exchange between nodes and APs. In this method, the AP allocates certain channel resources to randomly formed groups, and the nodes in the group access the channel sequentially in TDMA mode to send control frames to the AP. When the AP receives the control frames sent by the nodes, it responds with an ACK frame to the nodes. In this process, the nodes located within the coverage area of ​​t...

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Abstract

The invention relates to a avoidable grouping method for wireless local area network hidden terminals. The AP of the present invention allocates certain channel resources to randomly formed groups, and the nodes in the group access the channel in TDMA mode to send control frames to the AP in turn. The AP exchanges control frames, and other nodes monitor whether they have a hidden relationship with the sending node based on the monitoring of the control frame, and feed back the monitoring results to the AP, and the AP builds a hidden relationship table for randomly formed groups. The invention overcomes the defect that the monitoring result is inaccurate caused by factors such as channel error, noise, propagation time delay and the like in the actual network environment. The method of the present invention utilizes the node and the AP to exchange frames to monitor the hidden relationship without being affected by factors such as channel noise and time delay, effectively reduces hidden conflicts and competition conflicts, improves network throughput, and shortens channel access time.

Description

technical field [0001] The invention relates to an IEEE 802.11ah wireless local area network communication system with low frequency band and low power consumption, in particular to a grouping method for avoiding hidden terminals in the wireless local area network. Background technique [0002] The IEEE 802.11ah wireless LAN has a coverage of 1km and can support more than 8,000 nodes. It is a key technology supporting IoT applications such as smart grids and security monitoring systems. [0003] However, the media access layer of the 802.11ah wireless LAN continues to use the distributed channel access method (DCF, distributed coordinate function) based on the carrier sense access / collision avoidance mechanism, which will cause serious hidden terminal problems in dense network environments. , competition conflicts and other issues. The research points out that the probability of any two nodes becoming hidden terminals in a randomly deployed WLAN is 41%. When the number of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/04H04W74/02H04W74/08
CPCH04W24/04H04W74/02H04W74/0816
Inventor 雷晓颖张乐君
Owner YANGZHOU UNIV