A channel access method and device

Abstract

The invention relates to the technical field of wireless network communication, in particular to a channel access method and device. The method comprises the steps that a network node initializes a variable and positions the initial boundary of a backoff period, and the variable comprises a backoff frequency NB, a competition window size CW and a backoff index BE; After the random back-off is finished, executing idle channel assessment (CCA) to carry out current channel detection, and judging whether the current channel is idle or not; When it is judged that the current channel is idle; wherein the value of the CW is self-subtracted by one, when it is judged that the value of the current CW is 0, the current channel is accessed with the access success probability corresponding to the access priority of the current CW, and the access priority of any network node is determined by the current service load size and the current flow type of any network node. By adopting the method, the factors of the service load and the flow type are comprehensively considered, and the collision probability is reduced, so that the power consumption of the network node is reduced, and the overall throughput of the network is improved.

Description

technical field [0001] The invention relates to the technical field of wireless network communication, in particular to a channel access method and device. Background technique [0002] With the continuous development of communication technology, Wireless Multimedia Sensor Networks (Wireless MultimediaSensor Networks, WMSN) has been paid more and more attention by researchers. The data it transmits is mainly audio and video data, and the amount of information is very large. Wireless multimedia sensor network is a distributed sensor network composed of a group of multimedia network nodes (hereinafter referred to as network nodes) with perception, computing and communication capabilities. It collects various media information of the surrounding environment through multimedia sensors on network nodes, such as audio, video, images, etc., and collects data to the aggregation node through multi-hops to achieve comprehensive and effective environmental monitoring. The Medium Acces...

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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a channel access method and device, which are used to solve the problems in the prior art that there is a high probability of collision, high power consumption of network nodes, low network throughput, and inability to meet various Problems of Multimedia Sensor Network with Business Coexistence

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