为了保障天基网的服务质量(Qos),基于现有地面网络QoS模型并结合天基网特性,提出了一种基于区分服务的天基网QoS模型SBN-DiffServ.该模型利用区分服务中DSCP(differential services code point)和PHB(per-hope behaviour)的概念以及天基网的分层体系结构和多星选择接入机制,通过扩展DSCP和PHB的概念及其实现方式,将传统的队列管理和多星接入机制结合,实现了在带宽和时延保证方面有较好约束的天基网QoS保证机制,并在NS2环境下进行了仿真验证.结果表明,该模型对不同优先级的业务提供不同的带宽和时延保证,能够实现具有良好带宽和时延性能的天基网QoS保证系统.%In order to ensure the QoS in space-based networks (SBN), a new SBN QoS model based on DiffServ, which was short for SBN-DiffServ, was proposed. The SBN-DiffServ was based on the existed terrestrial network QoS model designed to meet the SBN features, such as the layered architecture and the multi-satellite selection scheme. By extending the differential services code point (DSCP) and per-hope behaviour (PHB), traditional queue management and multi-satellite access mechanism were integrated. The SBN-DiffServ has achieved a better bandwidth and latency constraints on SBN QoS assurance mechanism. Simulation was completed in NS2 environment. The results show that the model offers different bandwidth and delay guarantee for different priority services, which can be used to ensure a good bandwidth and latency performance of SBN QoS assurance system.
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