A transmission method based on quasi-random backoff strategy in wireless distributed network

Abstract

The present invention provides a transmission method based on a quasi-random backoff strategy in a wireless distributed network, including: counting the number Ai of data packets successfully sent by other stations except sending station i; The interval Si between the timeslots of packets arriving at the sending site; when the channel is judged to be idle for the first time, it is determined by the time slot threshold N for changing from definite backoff to random backoff and the maximum backoff window length M in the process of quasi-random backoff according to Ai and Si when the channel is judged to be idle for the first time The first waiting time, and send a new data packet when the channel is judged to be free for the second time; if the result of the second judgment is that the channel is busy, wait until the channel is free; if the channel is busy, wait until the channel is free; update Ai; according to Ai, N And M determines the second waiting time; judge whether the channel is free for the third time, if the result of the third judgment is that the channel is busy, then return to wait until the channel is free and wait until the channel is free; if the result of the third judgment is that the channel is free, then Send a new packet.

Description

technical field [0001] The present invention relates to a transmission method in a wireless distributed network, more specifically, to a transmission method based on a quasi-random backoff strategy in a wireless distributed network. Background technique [0002] The backoff strategy is a commonly used competition solution in the wireless node MAC protocol. It uses various algorithms to determine the waiting time for each node before sending a message. The purpose is to effectively avoid data transmission failure caused by simultaneous data transmission between stations when multiple stations compete for the same channel at the same time, thereby ensuring the effectiveness of access and improving the utilization of system resources. [0003] In currently used wireless distributed network MAC protocol standards, a binary exponential backoff strategy (BinaryExponential Backoff, BEB for short) is the most commonly used backoff method. Although the BEB policy has slight differen...

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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a transmission method based on a quasi-random backoff strategy in a wireless distributed network by using the information of the order of the successful data packets sent by each station before. It is transformed into a quasi-random backoff, which greatly reduces the transmission conflicts of each site during backoff, effectively improves the system throughput and reduces the data transmission delay, and is used to solve the poor performance of the existing technology, which will cause data transmission time under high load conditions. Problems such as large jitter range of delay

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