Method for dynamically setting minimum node contention window value according to retransmission frequency

Abstract

The invention discloses a method for dynamically setting a minimum node contention window value according to retransmission frequency, which mainly solves the problem that the network performance is lowered because the minimum contention window value is statically set in the prior art. The method comprises the following implementation steps: (1) transmitting a current data packet through a node, and recording the retransmission frequency with transmission success; (2) comparing the recorded retransmission frequency with two set threshold values, when the retransmission frequency is smaller than the first threshold value, setting the minimum contention window value as a default minimum contention window value in a communication standard; when the retransmission frequency is larger than the first threshold value and smaller than the second threshold value, setting the minimum contention window value to be alpha times that of the default minimum contention window value in the communication standard; when the retransmission frequency is larger than the second threshold value, setting the minimum contention window value to be beta times that of the default minimum contention window value in the communication standard; and (3) continuing to contend channels through the nodes after the minimum contention window value is set. According to the mode, the time delay of node transmission data is reduced, and the performance of the communication network is improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a method for dynamically setting the minimum contention window value of a node in a distributed coordination function (DCF) in the wireless local area network field. It can be used to reduce the link transmission time, increase the probability of successful data packet transmission, and effectively improve the performance of the wireless local area network under the premise of ensuring the traffic throughput in the wireless local area network. Background technique [0002] Currently the most widely used wireless local area network WLANs standard—IEEE802.11 mainly has two access mechanisms, namely the distributed coordination function DCF based on contention and the point access function PCF without contention. Among them, DCF is based on carrier sense multiple access / collision avoidance CSMA / CA, and uses a binary exponential backoff algorithm to reduce the probability...

AI Technical Summary

Problems solved by technology

[0007] The above network status measurement methods all require real-time monitoring of the channel and additional calculation work, which not only brings high complexity to the algorithm for dynamically setting the minimum contention window value of nodes, but also the time delay caused by calculation will affect the dynamics of the minimum contention window value of nodes. Accuracy of settings

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