Distributed channel allocating method in multi-channel multi-radio wireless Mesh network

Abstract

The invention relates to a distributed channel allocating method in a multi-channel multi-radio wireless Mesh network, which comprises the steps of: initiating a route request by a node needing route discovery, after a target node receives a request message, figuring out a channel free degree and a surplus available bandwidth through a network allocation vector (for short NAV) when replying along a reverse route, solving weighted average expected transmission time (WA ETT), selecting a channel with the minimum WA ETT as a channel for allocating to a link, after allocating the channel for each jump in each path, respectively figuring out a value of a route metric EWCETT (Evoluted Weighted Accumulation Expected Transmission Time) of each path, and selecting the path with the minimum EWCETT value as an optimal route for transmitting and maintaining. According to the invention, channel allocation and route selection are fused together, the time of channel allocation and route selection is effectively reduced, and network throughput, end-to-end time delay and network overhead of the multi-channel multi-radio wireless Mesh network can be effectively improved.

Description

technical field [0001] A distributed channel allocation method in a multi-channel multi-radio frequency wireless mesh network. The channel is selected by using the minimum transmission time, and the optimal route is selected by channel allocation and routing selection criteria. Background technique [0002] A Wireless Mesh Network (WMN) is a broadband network that can be used to access the Internet, and it has the characteristics of high capacity and high speed. It consists of wireless nodes distributed in a mesh, and realizes the interconnection and intercommunication between nodes through adaptive node discovery, topology maintenance and multi-hop forwarding. Wireless Mesh network is a special mobile ad-hoc network, which inherits some of the characteristics of wireless LAN technology, which is equivalent to the integration of WLAN and Ad Hoc network technology, and has the advantages of these two technologies. The design purpose of the wireless Mesh network is to enable...

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Problems solved by technology

Although the widely used IEEE802.11a protocol theoretically has a peak rate of 54 Mb / s, in practice, due to various factors such as packet loss and collisions when multiple users access, the actual usable rate is about It is only half of the peak value, which greatly limits the data transmission rate of the network and the total capacity of the entire network, resulting in the failure of some data services with relatively high bandwidth requirements to be transmitted in the network

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