  The packet throughput in 5th Generation (5G) New Radio (NR)
Vehicle-to-Everything (V2X) is highly dependent on the Medium Access Control
(MAC) based scheduling algorithm with no base station participation. In
particular, the Semi-Persistent Scheduling (SPS) algorithm has been
standardized by the 3rd Generation Partnership Project (3GPP) for V2X resource
scheduling in the out-of-coverage scenario. This paper analyzes the NR-V2X SPS
throughput from the MAC perspective, where the packet reception ratio (PRR) and
half-duplex (HD) effect dominate. We first investigate the average throughput
in the fully connected vehicular network, in which all the vehicles share the
same throughput. Subsequently, the average throughput as a function of distance
in the partially connected vehicular network is analyzed. The Monte Carlo
simulation results show that increasing the resource keeping probability can
improve the average throughput. Meanwhile, in the partially connected network,
the lower resource keeping probability is prone to obtaining the higher
throughput gain by increasing the number of subchannels.
