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Effect of Retransmissions on the Performance of C-V2X Communication for 5G

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Document pages: 7 pages

Abstract: In recent years, the next generation of wireless communication (5G) plays asignificant role in both industry and academy societies. CellularVehicle-to-Everything (C-V2X) communication technology has been one of theprominent services for 5G. For C-V2X transmission mode, there is a newlydefined communication channel (sidelink) that can support direct C-V2Xcommunication. Direct C-V2X communication is a technology that allows vehiclesto communicate and share safety-related information with other trafficparticipates directly without going through the cellular network. The C-V2Xdata packet will be delivered to all traffic Users (UE) in the proximity of theTransmitter (Tx). Some UEs might not successfully receive the data packetsduring one transmission but the sidelink Tx is not able to check whether theReceivers (Rxs) get the information or not due to the lack of feedback channel.For enabling the strict requirements in terms of reliability and latency forC-V2X communication, we propose and evaluate one retransmission scheme andretransmission with different traffic speed scheme. These schemes try toimprove the reliability of the safety-related data by one blind retransmissionwithout requiring feedback. Although this retransmission scheme is essential toC-V2X communication, the scheme has a limitation in the performance aspectbecause of its redundant retransmission. Since radio resources for CV2Xcommunication are limited, we have to detect the effect of retransmission onthe performance of the communication system. To the end, the simulator forevaluating the proposed schemes for the C-V2X communication has beenimplemented, and the performances of the different communication schemes areshown through the Packet Reception Ratio (PRR).

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