A solution to rts collision based on fair competition

A fair competition and solution technology, applied in the field of wireless communication systems, can solve problems such as conflicts, achieve fair access channels, increase fairness index, and improve fairness problems

Active Publication Date: 2018-05-15
南京易太可通信技术有限公司
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Problems solved by technology

[0006] Purpose of the invention: the present invention aims at the problem that two stations that are mutually hidden nodes in the wireless local area network simultaneously send RTS frames to the AP and collide, and proposes a solution to the RTS collision based on fair competition

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  • A solution to rts collision based on fair competition
  • A solution to rts collision based on fair competition
  • A solution to rts collision based on fair competition

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Embodiment Construction

[0031] The present invention will be further explained below in combination with specific embodiments.

[0032] like Figure 5-7 As shown, a RTS collision resolution method based on fair competition includes the following steps:

[0033] Step 1, station A uses the RTS / CTS handshake mechanism to send RTS frames;

[0034] Step 2, the stations around station A set the NAV according to the "duration" field contained in the received RTS frame;

[0035] Step 3, if station A does not receive the CTS frame sent by the surrounding stations within the CTSTimeout time, it means that the CTS frame collides with the hidden node, and station A sends a CF-End frame at this time;

[0036] Step 4, the peripheral stations that have received the RTS frame sent by station A set their NAV to 0 after receiving the CF-End frame;

[0037] Step 5, the contention window of A is doubled, and A uses the two-step back-off contention access mechanism to compete for the channel; the two-step back-off con...

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Abstract

The invention discloses a fair competition-based RTS collision solution method which is applicable to a wireless local area network. The method comprises the following steps: in distributed channel access, a site A transmits an RTS frame first when the site A transmits data by using an RTS / CTS handshaking mechanism; a peripheral site of the site A sets an NAV according to the received RTS frame; if a site in the range of a base station AP receives a CTS frame, then the corresponding site sets or updates the NAV according to a time length field carried by the CTS frame; the site A transmits MPUD data; if the site in the range of the base station AP does not receive the CTS frame, then the site A transmits a CF-End frame; the peripheral site which has received the RTS frame transmitted by the site A sets the NAV thereof to be 0 after receiving the CF-End frame; competition windows A are doubled, and the site A completes for a channel by using a two-step back competition access mechanism. According to the method, the equal channel access opportunities of all sites are guaranteed; the fairness of the system is greatly improved.

Description

technical field [0001] The invention proposes a RTS (requset to send) collision solution method based on fair competition, which belongs to the technical field of wireless communication systems. Background technique [0002] In a wireless local area network, a base station is also called an access point (AP, access point). In WLANs, the distributed nature of channel access makes a carrier sense mechanism crucial for collision-free operation, however in some cases physical carrier sense may not be able to detect transmissions from all stations. like figure 1 As shown, the transmission sent by station (STA, station) A can be detected by base station AP and station C. Another remote node, site B, can detect the base station AP, but cannot detect site A, and vice versa, so site A and site B are mutually hidden nodes. [0003] Network allocation vector (NAV, network allocation vecror) is a mechanism used to overcome the hidden node problem. Provides a virtual carrier sense me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
CPCH04W74/0841H04W74/0866
Inventor 黄永明陈峰何世文王海明张军洪伟江华
Owner 南京易太可通信技术有限公司
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