Numerical Approximation of 5G-V2V Physical Sidelink Shared Channel (PSSCH) Capacity Limit using M/G/1 Queuing and Newton–Raphson Method

Abstract

3GPP 5G V2X technology promised some advanced vehicle safety driving use cases in the future. Vehicle to vehicle communications (V2V) is the pivotal enabler in 5G-V2X by allowing the exchange of Cooperative Awareness Message (CAM) over the Physical Sidelink Shared Channel (PSSCH). In this paper, we modeled the performance of the 5G V2V PSSCH capacity limits based on different CAM payload sizes and vehicle densities using M/G/1 queuing theory and Newton Raphson (N-R) method. Results proved that 5G V2V cell capacity demands is in the order of multiple Gbps. PSSCH message should be kept below 1500 bytes to ensure moderate capacity demands below 1 Gbps limit. For any given practical 5G V2V system vehicle densities, size of CAM data payload and generation times will influence capacity limits. System capacity increase with increasing PSSCH message sizes and number of vehicles arriving into the system, with PSSCH message sizes being the more dominant contributor. Average capacity growth is larger in the 1000 to 1500 bytes region of about 130% as compared to higher PSSCH message size regions. The results ultimately presents important understanding on the relation between different CAM payload sizes and the resultant PSSCH message sizes, and their impact on total system capacities.