Research Technologies And Evalution In 5G Vechicle-to-everything Resource A Llocation

With the research and formulation of the fifth generation mobile communication technology(5G)by the 3rd Generation Partenship Project(3 GPP)standardization working group,the New Radio Vehicle-to-Everything(NR-V2X)is discussing and studying by the 3 GPP standardization organization.The way of using the frequency band above 6 GHz and the limited resources to improve system performance is one of the major elements in NR-V2X.Begining with the basic principle and system model of NR-V2X,directly Vehicle-to-Vehicle(V2V)communication is analysed and evaluated.In view of the shortage of existing frequency band resources utilization,the way of applying the frequency band above 6 GHz in V2V communication is analyzed.The nature of path loss is elaborated carefully in highway and urban grid scenarios,which are line-of-sight(LOS),Non-Line-of-Sight due to vehicles(NLOSv)and Non-Line-of-Sight(NLOS).In order to reduce the number of resource detections in a short period of time,a vechicle grouping mechanism is proposed.It can reduce the number and time of resource detection by detecting only one header vehicle in each grouping.On the other hand,in order to apply resource allocation technology to different traffic in V2V communication,the resource allocation scheme of sidelink channel is deeply analyzed and studied.By introducing a short-term sensing mechanism and counter-based collision avoidance mechanism,a small-scale sensing resource allocation algorithm is proposed.The key idea are the conflict short-term sensing and avoidance mechanism of counter,which are sensing and judging the use of resources by constructing the candidate sidelink resource set and the conflict avoidance counter.Therefore,the control channel is decoded in a short time.Only when the data packet arrives and the conflict avoidance counter detects the resources are idle,the resource selection can be started.This algorithm can accurately detect channel usage status,and it also improves the accuracy of resource transmission.Finally,a system-level simulation platform is built by C++,and the two modules are based on small-scale sensing resource allocation algorithm and V2V channel propagation model.By comparing the existing resource allocation schemes,it is verified that the algorithm improves the successful packet reception ratio of periodicity and aperiodicity traffic in highway and urban grid scenar:ios.Thus it also verifies the performance of the algorithm on the system.