Simulation-based Research On Control Channel Performance Of 5G V2X

The Third Generation Partnerships Project(3GPP)launched research on 5G Vehicle-to-Everything(V2X)in June 2018.5G V2X has great significance for improving traffic safety and achieving autonomous driving.Physical Sidelink Control Channel(PSCCH)transmits control signaling that determines the scheduling of resources on sidelink,so the research on PSCCH of 5G V2X is very important.This thesis studies the design of PSCCH structure,and proposes schemes for important research points,and evaluates the performance on the link-level simulation platform.The main research contents are divided into the following three aspects:1)Design the PSCCH link-level simulation platform.Using MATLAB to write the sending end,channel,receiving end and other modules of the PSCCH link-level simulation platform.In order to ensure that simulation platform conforms to the channel characteristics of V2X communication,author studies channel characteristic and channel model of V2X under high-speed mobile environment.For the problem of interference between subcarriers caused by severe Doppler frequency shift in V2X,a frequency offset estimation and adjustment module is designed in the receiving end of the platform.2)Study Demodulation Reference Signal(DMRS)structure of PSCCH.The DMRS design of PSCCH is very important,the terminal makes frequency offset estimation and channel estimation based on DMRS.In order to solve the problem of increasing the difficulty of channel estimation due to the fast time variability of V2X channels and severe Doppler frequency shift,so author proposes to increase time-frequency domain density of DMRS,and combines the multiplexing structure of control channels and data channels to design four DMRS structures.The link-level simulation platform proves that the first structure has the highest decoding reliability,and should be used as the DMRS structure of PSCCH.3)Research on the transmission of two-stage Sidelink Control information(SCI)in PSCCH.To meet the needs of V2X to support multiple communication modes,such as unicast,multicast,and broadcast,3GPP has proposed a two-stage SCI transmission method,but the specific implementation is still in the preliminary research stage.This thesis studies the feasibility of two-stage SCI transmission and the information fields carried by the two-stage SCI transmission,and designs the information fields carried by SCI in unicast,multicast and broadcast communication,and designs the information fields carried by each stage of two-stage SCI transmission.For the simulation of two-stage SCI transmission,the thesis proposes a relevant channel simulation in accordance with its transmission mode,it is concluded that two-stage SCI transmission has a lower block error rate than one-stage SCI transmission through the simulation,so PSCCH should support two-stage SCI transmission mode.