Design and Verification of SPMA Protocol for Wireless Ad Hoc Networks

In order to meet the requirements of high dynamic, high throughput and low delay in Ad Hoc networks, and to achieve high quality of service for high priority services, this paper studies the multiple access protocol based on statistical priorities, and proposes the specific implementation of physical layer and link layer. Each node in the network first counts the time-frequency two-dimensional channel occupancy (channel state), and then combines with the priority of various types of services. When the channel occupancy exceeds a preset threshold, it timely intercepts and stops the low priority services, so as to maintain the network unobstructed without rapid deterioration and ensure the low delay transmission of high priority services. When the network condition is better, the low priority service is transmitted. In this paper, the SPMA simulation scenario of Ad Hoc network is constructed, and the channel load rate, the delivery rate of each priority, the throughput of each priority, the packet loss rate of each priority, and the queuing delay of each priority are tested and analyzed. The results show that the SPMA protocol has the ability of efficient network management and differentiated service support.