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5G New Radio (NR) Sidelink (SL) has demonstrated the promising capability forinfrastructure-less cellular coverage. Understanding the fundamentals of the NRSL channel access mechanism, Semi-Persistent Scheduling (SPS), which isspecified by the 3rd Generation Partnership Project (3GPP), is a necessity toenhance the NR SL Packet Reception Ratio (PRR). However, most existing worksfail to account for the new SPS features introduced in NR SL, which might beout-of-date for comprehensively describing the NR SL PRR. The existing modelsignore the relationships between SPS parameters and, therefore, do not providesufficient insights into the PRR of SPS. This work proposes a novel SPS PRRmodel incorporating MAC collisions based on new features in NR SL. We extendour model by loosening several simplifying assumptions made in our initialmodeling. The extended models illustrate how the PRR is affected by various SPSparameters. The computed results are validated via simulations using thenetwork simulator (ns-3), which provides important guidelines for future NR SLenhancement work.

Semi-Persistent Scheduling in NR Sidelink Mode 2: MAC Packet Reception Ratio Model and ns-3 Validation