Transmission method based on quasi-random back-off strategy in wireless distributed network

Abstract

The invention provides a transmission method based on a quasi-random back-off strategy in a wireless distributed network. The transmission method comprises the following steps: counting the number Ai of data packets successfully transmitted by other sites except a transmission site i; counting an interval Si between the last busy end time slot of a channel to the transmission site arrival time slot of new data packets; determining first waiting time based on a time slot threshold value N on which certain back-off is turned into random back-off and a maximum back-off window length M in a quasi-random back-off process according to Ai and Si when the channel is judged to be idle for the first time, and transmitting the new data packets when the channel is judged to be idle for the second time; when a second judgment result indicates that the channel is busy, waiting till the channel is idle; if the channel is busy, waiting till the channel is idle; updating Ai; determining second waiting time according to Ai, N and M; judging whether or not the channel is idle for the third time, and returning to wait till the channel is idle if a third judgment result indicates that the channel is busy; and if the third judgment result indicates that the channel is idle, transmitting the new data packets.

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 (Binary Exponential Backoff, BEB for short) is the most commonly used backoff method. Although the BEB policy has slight differe...

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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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