Abstract:

In the near-space communication network,limited wireless resources are shared by different kinds of services.Thus,a simple and effective media access control（MAC） protocol should be designed to guarantee the service quality and to improve the channel utilization efficiency.This paper proposes a novel MAC protocol for the mixed services in the near-space communication network.By performing the optimized combination of slots in the frame,the service separation and the service priority determination,the proposed protocol well supports the services mixed by voice,data and real-time variable bit rate（rt-VBR） video.Simulated results show that the proposed MAC protocol effectively guarantees the service quality with a maximum channel utilization of 85%.

Key words: near space, communication network, media access control, protocol, mixed service