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中文摘要：
在临近空间通信网络中,不同的业务共享带宽有限的无线信道,因此,需要设计一种简单有效的MAC协议,以便在保障业务服务质量的同时提高信道利用率.文中提出了一种用于支持混合业务的临近空间通信网络MAC协议.通过对帧时隙进行最优划分组合、业务分离和业务优先级判断,协议很好地支持了语音、数据和实时变速率（rt-VBR）视频混合业务.仿真结果表明,该协议在保证各种业务服务质量的同时最大信道利用率达到85%.
英文摘要：
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%.
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