Research On The Resource Allocation Schemes In V2V Communication

With the rapid development of wireless communication technology,the traditional 4G network can no longer satisfy the ever-increasing communication needs of people.Therefore,the 3GPP(3rd Generation Partnership Project)standardization work group started to investigate the 5G related technologies to provide more diverse,more high-speed,and more reliable communication services.As one of the key application scenarios of 5G,internet of vehicles is widely concerned by the industry.The 3 GPP standardization work group also has done lots of research works on the core technology of V2V(Vehicle to Vehicle)communication,and the discussion results have been summarized into the standard technical report TR36.885.In the V2V communication system,the topology of the network changes rapidly,the user density is more intensive,and the system resources are relatively limited.Therefore,there is a high probability that a resource collision may occurs among the vehicles during information transmission.In order to solve this problem,a lot of research and analysis on the resource allocation schemes in V2V communication system have been done in this paper.Firstly,the random selection scheme of resource allocation under vehicle-to-vehicle direct communication without the instruction of base station is modeled and analyzed.Because of the high probability of resource collision under this resource allocation scheme,the CQI(Channel Quality Indicator)feedback based resource allocation scheme is designed for unicast transmission and the vehicle user equipment measurement based resource allocation scheme is designed for broadcast communication.The new designed resource allocation schemes can allocate system resources more rationally by measuring and sequencing the channel status or resource status.Based on the characteristics of V2V communication,new resource allocation schemes have been designed based on the idea of user grouping,including:1)Resource allocation scheme based on the type of user’s communication,which is used to solve the interference between the users in the I2V(Infrastructure to Vehicle)and V2V coexistence scenario;2)Resource allocation scheme based on vehicle user’s driving directions,which is used to solve the problem that the vehicle users may not sense each other caused by hidden node problems happened in the crossroads in the V2V system;3)The resource allocation scheme based on the geographical location information of the vehicle users,which is used to reduce the interference caused by the in-band emission problem in the V2V system.Finally,a system-level simulation platform of the urban scenario is modeled and built.The performance of the above resource allocation schemes has been evaluated based on the platform.By comparing the simulation results of the packet reception ratio under different resource allocation schemes,it can be seen that significant performance gain can be achieved when the proposed resource allocation schemes are adopted.