Research On QoS Routing Algorithms In Wireless Mesh Network

The Wireless Mesh Network(WMN),which has the advantages of high transmission speed and high bandwidth,is a new type of multi hop wireless network that has been widely concerned by all walks of life in recent years.Due to the characteristics of multi hop network topology and the unpredictability of wireless transmission environment,the method of providing QoS guarantee during data transmission is one of the hot topics in the research of wireless Mesh network at this stage.This paper firstly introduces the wireless Mesh network and the existing routing protocols,and studies the multipath routing strategy and ant colony algorithm.Based on the existing DSR protocol,in order to better adapt to the change of wireless Mesh network QoS with the change of network topology,this paper proposes a multi constraint QoS improved multi-path DSR routing algorithm qmdsr.The algorithm uses the Hello message mechanism of AODV protocol for reference,and designs to send Hello message packets according to the dynamic cycle of node remaining bandwidth to sense the change of wireless Mesh network in time.Depending on bandwidth and delay as the threshold of path selection,multiple paths meeting the requirements of data transmission QoS are selected.According to the designed path correlation calculation method,two paths with the least correlation are selected for multi-path transmission strategy.Finally,the simulation results show that the algorithm can keep better QoS performance when the wireless Mesh network nodes are constantly moving.In order to further improve the network performance of the QMDSR routing algorithm when the network is highly congested,this paper proposes a multi-path QoS routing algorithm AQMDSR based on the ant colony algorithm under this QMDSR algorithm.The algorithm adaptively modifies the data structure of traditional ant colony algorithm,improves the next hop selection rule and globalpheromone update rule,changes the routing criteria of QMDSR protocol based on the principle of minimum hop number,considers QoS parameters such as bandwidth,delay and hop number according to different weight coefficients as the evaluation criteria of path QoS,and combines with multi-path Strategy,which is helpful to further improve the performance of routing algorithm.The simulation experiment results show that the network delay is reduced under the condition of large network congestion,meantime the other QoS performance has not been descended.