面向差异化QoS保障的卫星返向链路资源分配策略

Resource Allocation Strategy for Satellite Return link to Provide Differentiated QoS Support

面向采用多频时分多址接入(MF-TDMA)体制的宽带卫星返向链路,提出了一种符合第2代数字视频广播-交互式卫星系统(DVB-RCS2)标准的差异化服务质量(QoS)资源分配策略,能够从用户优先级与业务类型区分QoS级别,为系统中的用户提供6类不同的QoS保障。基于资源分配策略设计了一种面向差异化QoS保障的返向链路资源分配算法,保障重点用户接入,并在系统资源不足时通过服务降级显著提升用户服务率。仿真结果验证了所提策略在用户与业务维度均能提供差异化的服务质量,可用于宽带卫星通信系统。

The return link resource allocation in a satellite system that adopts the MF-TDMA(multi-frequency time division multiple access)is considered in this paper,and a differentiated QoS(quality of service)support resource allocation principle to supply distinguishable QoS gua￣rantee for different users and different service types is put forward.Taking consider of both user priority and service type,the proposed strategy is able to provide 6 classes of QoS support.Finally,a resource management algorithm for satellite return link is proposed based on the foundation of the differentiated QoS support resource allocation principle,which ensures the access of prioritized users as well as elevates the service rate via QoS degradation in case of the lack of resource.Simulation results demonstrate the ability of the strategy on provisioning the distinguishable QoS on both user and traffic aspects.The proposed strategy can be applied to wideband satellite systems.