The Research Of Cooperative Routing In Wireless Multi-hop Networks

With the continuous development and the rapid spread of the information technology,people’s demand for mobile communication grows day by day, wireless communication has become an important issue for further development of the informatization. For the use of wireless transmission medium as the carrier of information transmission, the reduction of the needs of connection, wireless network is more able to meet the needs of users for mobile communication, obtained a rapid development in recent years and has become an important part of the global communications network for the present. And with the growing capabilities of wireless terminals,people’s requirements for the wireless transmission service quality is also enhance unceasingly,especially for the data transmission reliability in the high-speed communication.So how to improve the utilization of the existing network resources and data rates,reduce the network outage probability has become one of the important topics of the research of the wireless multi-hop network communication.In recent years,communication technology appears, it uses the broadcast feature of the signal, applying the idea of collaboration into the wireless communication, relying on the cooperative transmission between nodes to improve the quality of wireless communication.It can not only expand wireless network connectivity, enhance the capacity of the wireless communication system,but also can reduce communication outage probability,save the energy of data transmission.Based on the detail introduction of wireless multi-hop network and cooperative communication technology,the thesis illustrates the fundamentals and concepts of cooperative routing and describes existing cooperative routing algorithm based on different criteria in detail.Cooperative routing is a cross-layer routing design scheme which combine the cooperative communication technology worked in physical layer and the route selection technology applied in network layer to improve network performance. However,the existing cooperative routing mechanisms don’t take full advantage of the characteristics of network topology.Based on the consideration of the nodes distribution density of the wireless multi-hop network, the paper proposes the cluster-based cooperative routing algorithm which comprehensive utilizes different advantages and characteristics of the clustering routing and cooperative routing,takes full account of the influence factor of node topology in cooperative communication,selects the cooperative path on the basis of the classification of the nodes and takes performance simulation using data test methods.Simulation results show that the algorithm can significantly improve the routing outage probability performance,increase the network reliability.Aiming at the non-cooperative characteristics of the nodes in practical wireless multi-hop network,this paper studied the current research status,discussed the problem of establishing effective node coordination incentive mechanism in depth.By introducing the idea of game theory,the paper analyzed and summarized the research of node coordination incentive mechanism based on game theory and the challenges faced under research, and prospects the feasible research direction in the future.