Analysis of PR-ALOHA protocol for inter vehicle communications

The performance of Reservation ALOHA with Priority (PR-ALOHA) protocol in an inter-vehicle communication (IVC) environment was investigated both in transient and steady state. Monte Carlo simulation was performed to examine the system stabilization time (SST) in transient state and performance parameters such as throughput, packet delivery ratio and packet drop rate (PDR) in steady state. The analysis assumed a non ideal channel with communication errors with and without considering capture effect. The simulation results show that SST in the transient state depends strongly on capture effect, however, performance parameters at steady state where slightly affected. At high traffic (40 terminals), the network throughput increased by 5%, the packet drop rate decreased by 3% and the packet delivery ratio increased by 4% with capture effect. For heavy traffic, capture effect can improve stability and the performance of PR-ALOHA system.