Study On Resource Allocation And Routing Selection Algorithms For Multi-hop D2D Communication

With the popularity of mobile Internet,the requirements for data transmission rate of wireless communication networks are becoming higher and higher.How to maximize the utilization rate of the limited spectrum resources is becoming a hot spot of current research.Device-to-Device(D2D)communication technology has the characteristics of low equipment power consumption,low network delay,wide coverage,high data transmission rate and high spectrum efficiency,which is one of the key technologies of 5G communication network in the future.D2 D communication offers a new way to uninstall large-capacity mobile service,which uninstalls business service by wireless multi-hop routing.There are two key issues that must be addressed to improve validity and reliability in information transmission.One of them is how to use network coding to further improve transmission capacity and design transmission resource allocation scheme.The other is how to choose the routing using D2 D short distance communication in multi-hop transmission.Our research mainly solved these two problems.On the basis of studying multi-hop D2 D communications,in order to further extend the advantage of D2 D communication in data transmission rate and spectrum utilization,and to introduce the multi-hop transmission mechanism aided by network coding,we presented the Random linear Network Coding based Multi-hop Cooperative relaying program(RNCMC).The program has used idle cellular users as relay nodes to solve uplink resource allocation problem among multiple cooperative relay,D2 D users and free cellular.So we proposed greed QoS multi-hop resource allocation algorithm.Simulation proves that the proposed resource allocation algorithm can effectively improve the performance of D2 D communication system under the premise of ensuring QoS service quality.In order to reduce the influence of location information deviation of D2 D communication mobile node on location routing,we proposed a Cooperative Cluster based Geographic Routing(CCGR)algorithm to reduce the influence of Geographic location error on wireless discharge.The algorithm considers the collaboration cluster as a virtual relay node whose main task is opportunistic receiving and cooperativetransmission.Opportunistic receiving promotes the link reliability through diversity receiving,and cooperative transmission extends the radio range.The simulation results show that the cooperative transmission method based on CCGR algorithm is far superior to the traditional non-cooperative transmission mode in link reliability.