Multi-hop Relay Selection Strategy Based On Social Relationship In LTE-A Communication Systems

In order to further improve the spectrum efficiency,energy efficiency and system throughput of D2 D communication system,this paper introduces social network into D2 D communication relay selection.This thesis mainly focuses on LTE-A model based on social characteristics and physical characteristics.Second,on the basis of this model,an innovative relay selection scheme with social trust value is proposed.The overall idea of this scheme is: firstly,obtain the location of the source node,the destination node and all other nodes through the channel state information,then calculate the middle position of the source node and the destination node,then take this middle position as the center,and R as the radius to start searching the channel A nodes whose channel gains are greater than the threshold as a set of candidates of relays.Finally,a global search algorithm is used to find the relay node with the largest target function value within the candidate range,and the final transmission relay node is determined in sequence.The proposed middle point-based relay selection scheme SCMRS(Social-aware Connection Midpoint Relay Selection)takes into account the location information,physical characteristics and social relations of source node and destination node.In the target function design,the proposed algorithm not only considers the system throughput and the success rate of node connection,but also takes into account the energy efficiency and spectrum efficiency.The simulation part compares the overall performance of the algorithm by several indicators of system throughput,access probability and utility function value.Simulations show that under the same conditions,the SCMRS algorithm not only can effectively improve the system throughput,but also improves the system's energy efficiency and spectrum efficiency,and is obviously superior to the traditional relay selection algorithms.