Design and Verification of Improved SPMA Algorithm in Multi-hop Environment

In order to solve the hidden terminal problem of SPMA protocol in multihop environment, this paper proposes a distributed load sensing method. The cross layer joint optimization design of network layer and link layer is adopted. The topology state perceived by network layer is used to correct the evaluation of the channel load rate in link layer, and then dynamically to adjust the priority threshold. The problem of inaccurate evaluation of SPMA channel load rate in multi-hop network environment is solved. And the message transmission success rate in multi-hop environment is improved. This paper establishes SPMA simulation scenario and improved algorithm model, then simulates and analyzes the application layer throughput, application layer end-to-end delivery rate, application layer end-to-end delay, link layer load, link layer throughput, link layer delivery rate, link layer queuing delay and other indicators. The results show that the improved algorithm proposed in this paper significantly improves the delivery rate of high-priority business. The strong QoS guarantee for high-priority business is realized.