Research And Design Of Key Technologies For Physical Layer To 5G V2X Standardization

With the rapid development of the automotive industry and the fifth generation(5G)technology,vehicle to everything(V2X)has attracted more and more attentions.In the latest protocol version Release 16,the third generation partnerships project(3GPP)has proposed lots of 5G V2X requirements of delay,reliability and scheduling flexibility.At present,the standardization research of 5G V2X focuses on physical layer technologies,including flexible physical layer numerology,carrier aggregation implementation,sidelink resource allocation,short transmission time interval,and physical layer feedback mechanism.The thesis has researched three key technologies below:Aiming at the implementation and configuration of flexible physical layer numerology in 5G V2X,firstly the thesis has analyzed the influencing factors of numerology selection,and also analyzed the specific influence of proposed factors.Secondly the thesis has designed the complete implementation scheme from the perspective of standardization,which can guarantee the influence of both vehicle motion state and channel environment.The proposed scheme can meet the performance requirments in different 5G V2X scenarios.Lastly,the signaling flow chart has been designed.Furthermore,the mathematical modeling based on queuing theory has been established,and the simulation results show that proposed scheme can guarantee the stability of the system and achieve the delay gain of up to 13 times.Aiming at the implementation of carrier aggregation and component carrier selection algorithm in 5G V2X,firstly the thesis has optimized the original carrier aggregation configuration process.Secondly the thesis has given out the suitable carrier aggregation implementation scheme for 5G V2X,the proposed scheme can support V2X carrier aggregation in two resource selection modes.Lastly the signaling flow chart has been designed.Furthermore,the component carrier selection algorithm based on channel busy ratio(CBR)has been proposed.The proposed algotirhm can balance channel quality and system load.The simulation results show that the proposed algorithm can achieve a throughput gain of up to 14.74%compared to other component carrier selection algorithms.Aiming at the 5G V2X Sidelink resource allocation,firstly the thesis has established the system model of 5G V2X sidelink resource allocation.Secondely the thesis has proposed a resource allocation scheme based on user equipment(UE)sensing and resource fairness.The proposed scheme can solve the problems of low resource utilization and unbalanced load caused by high-speed vehicle movement with the resource select mode of UE autonomous.Lastly the signaling flow chart has been designed.The simulation results show that the proposed algorithm can obtain the load balancing gain of up to 14.26%and reduce the system loss rate of up to 23.58%.