Enhanced SB-SPS Scheme to Mitigate Half Duplex Problem for C-V2X Relay Transmission in Vehicle Platooning

In vehicle platooning, one of the typical applications of Vehicle-to-Vehicle (V2V) communications using C-V2X (Cellular Vehicle-to-Everything), the vehicles need to exchange information such as the velocity and position of a vehicle leading the platoon to achieve safe platoon driving. Relay transmission using sidelink communications, specified by the C-V2X standard, is considered as a potential approach for information exchange in vehicle platooning. The autonomous resource management scheme, SB-SPS (Sensing Based Semi Persistent Scheduling), has been standardized for sidelink communications. However, half duplex problem, one of major problems in the SB-SPS, is not sufficiently resolved for the relay transmission in vehicle platooning. This work proposes an enhanced SB-SPS scheme to mitigate half duplex problem and improve the transmission performance for the relay transmission in vehicle platooning. The performance evaluation through computer simulation demonstrates the effectiveness of the proposed scheme.