Reseach On Channel Assignment In Ad Hoc Network

With the rapid development of modern wireless networking technology, wireless ad hoc network has become more mature and popular. But in reality, due to the increase of wireless network node density and limited spectrum resource, the contradictions and noise jamming between wireless spectrum tend to be strong, which have a significant impact on the wireless ad hoc network bandwidth and channel capacity. In order to satisfy the growing business needs, wireless ad hoc networks need to choose a better channel, which may improve the utilization of resources, lower the noises, enhance communication quality and increase the capacity of channel when networking. Thus the research on the strategy of channel allocation has become more and more important. Therefore this thesis do the research about channel assignment mainly through both chain networks and mesh networks.This thesis studies the strategy on single-link channel assignment and spreads the MAC layer of mobile nodes in NS2 at first. Then it realizes a multi-interface and multi-channel network, simulates the traditional MIMC mixed channel assignment strategy, optimizes the traditional MIMC in distributed way and centralized way respectively, and obtains the result of channel’s or thogonalization in single-link network. On the condition that available channels are assigned properly, this thesis reaches the maximization of link throughput. Based on the link of mobile nodes’ network and combination with distribution and centralization, this thesis proposes the MOVE-MIMC algorithm and testifies it in updated AODV protocol by simulation.This thesis researches on mesh network’s assignment strategy. Given the limited mesh network’s interfaces and nodes’ share problem when lots of links work together, this thesis analyzes the character of mesh network, proposes the NET-MIMC mesh network channel assignment algorithm based on mixed channel assignment theory. Under the premise of insuring network’s communication, this thesis assigns the orthogonal channel maximally, improves the network’s capacity and completes the verification of NET-MIMC by simulation through AODV’s multi-channel extension.All routing algorithms in this thesis have been proved by simulation and have a nice performance. The problem of throughput dropping during end-to-end multi-hop data transmission has been solved by the research of single link. Furthermore, the network’s capacity has been improved by the research of mesh network under the premise of insuring network’s communication, which can be fully utilized in emergency communication in the future and provide a reference for other studies.