Joint Optimization Of Channel Allocation And Routing Technology In MR-MC Networks

With the rapid development of wireless network technology,people desire better and faster communication.Compared with traditional wireless network,wireless Ad-hoc network technology is independent of infrastructure,can be deployed at any time,and all nodes are distributed operation.Traditional Single-Radio Single-Channel(SRSC)networks have some problems,such as poor utilization of spectrum resources and difficulty in adapting to complex wireless network environment.In contrast,Multi-Radio Multi-Channel(MRMC)improves network performance and resource utilization by fully utilizing channel resources.The thesis focuses on channel allocation and routing in MRMC wireless Ad-hoc networks.Firstly,the thesis introduces the advantages and problems of MRMC network,and studies the main points and difficulties of routing protocol design in multi-radio multi-channel network.The research and analysis of the existing channel allocation and routing technology provides the basis for the subsequent algorithm design.The main work of the thesis is listed as follows:This thesis proposes a design method for the available bandwidth between links.Due to the limited bandwidth resources of the wireless network,resource competition between links will occur.This thesis analyzes the influence of network interference and traffic load,comprehensively considers the influence of inter-flow interference,intra-flow interference,load balancing,etc.,and proposes a calculation method for the available bandwidth between links,in preparation for the subsequent design of the minimum end-to-end delay routing metric.For the delay-sensitive traffic transmission and in order to take the advantages brought by MRMC network,the thesis proposes a Minimum Link End-to-End Delay routing metric(LCDEED)based on Channel Diversity.Then a Multi-Channel-Based Optimized Link-State Routing Protocol(MC-OLSR)is proposed which is using this routing metric.The algorithm uses the designed available bandwidth model,combined with the influence of link quality,makes full use of channel diversity,and designs the minimum link end-to-end delay routing metric to reduce network end-to-end delay,improve network throughput,reduce network packet loss rate to improve network performance.The simulation results show that the LCDEED routing metric algorithm can effectively improve the network performance compared with other algorithms.In order to ensure Quality of Service(QoS),this thesis proposes Interference Load-Aware QoS algorithm(ILA-OLSR).The algorithm verifies the feasibility of the traffic flow by calculating the bottleneck bandwidth on the path,in order to guarantee QoS.At the same time,the algorithm is based on Ad-hoc network with low speed movement,so the influence of mobility is further considered in the design of routing metrics.In addition,the algorithm uses the sum of the load on the interfering links to replace the number of interfering links to achieve the interference suppression effect more sensitive to the traffic flow.Simulation results show that ILA-OLSR algorithm has better network performance than other algorithms.