Research On The Partial Overlapping Channel Assignment Algorithm Based On Interference-aware

Wireless Mesh Network(WMN)with the advantages of low cost,easy maintenance and robustness.It is one of the key networking technologies for the next generation Wireless networks.Compared with single-interface WMN,multi-interface multi-channel(MRMC)WMN can effectively improve the network throughput.But MRMC WMN increases the number of parallel transmission links in the network and increases the interference between links.Reasonable channel allocation scheme can reduce interference between the links and increase network capacity.Therefore,it is particularly important to design a reasonable channel allocation algorithm.At present,most of the research on channel assignment algorithm of MRMC WMN focuses on orthogonal channel.The commonly used IEEE 802.11b/g has only three available orthogonal channels,and the spectrum resources are limited.With the development of communication technology,interference caused by partially overlapping channels can be effectively suppressed.At present,studies have shown that the use of partially overlapping channels can effectively improve network performance.Therefore,it is of great significance to study the algorithm of partially overlapped channel assignment.In this paper,to solve the problem of imprecision measurement of unicast WMN partially overlapping channel interference,a load-aware POCs channel assignment algorithm(IAPOCA)is proposed,by constructing a signal-to-noise ratio matrix to measure inter-link interference and aiming at minimizing interference.This algorithm uses the signal to interference plus noise ratio(SINR)matrix to guide channel assignment,and comprehensively considers the influence of different channels on other links and the whole network.It assigns the channel with the least interference to the links with large load and interference,so as to reduce inter-link interference and improve network throughput.Multicast communication is a point to multipoint communication method.Reasonable use of multicast technology can improve spectrum utilization and network throughput.In this paper,aiming at the problem that the interference measurement of multicast WMN partially overlapped channels is inaccurate,the regional load is used to represent the influence of nodes on the whole network load,and a multicast WMN partially overlapped channel assignment algorithm(LIAM)is proposed.When calculating the load interferenceweight,according to the one-way transmission characteristics of multicast,this algorithm calculates the interference of the parent node to other nodes and the interference of the child node when receiving the signal.It assigns the channel with the least interference to the node according to the load interference weight.In channel assignment,all links of the parent node and its children are considered as a whole to make full use of the advantages of wireless broadcasting.In this paper,Matlab is used to achieve the channel assignment results of the unicast and multicast algorithm,and NS-3 is used to complete the performance simulation of the algorithm.Simulation results show that the LIAM and IAPOCA algorithms can effectively improve the overall network throughput,reduce end-to-end delay and packet loss rate.