A method to dynamically set the minimum contention window value of nodes according to the number of retransmissions

Abstract

The invention discloses a method for dynamically setting the minimum contention window value of a node according to the number of retransmission times, which mainly solves the problem in the prior art that the static setting of the minimum contention window value causes network performance to decline. The implementation steps are: 1) the node sends the current data packet, and records the number of retransmissions it successfully sent; 2) compares the recorded number of retransmissions with the two set thresholds: when the number of retransmissions is less than the first threshold value, set the minimum contention window value to the default minimum contention window value in the communication standard; when the number of retransmissions is greater than the first threshold and less than the second threshold value, set the minimum contention window value to the default minimum α times the contention window value; when the number of retransmissions is greater than the second threshold, set the minimum contention window value to β times the default minimum contention window value in the communication standard; 3) After the minimum contention window value is set, the node continues to compete channel. The invention reduces the time delay of nodes sending data and improves the performance of communication network.

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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