基于DiffServ的星上交换设计与仿真

星上交换的设计在满足对综合业务QoS支持的同时,还需要考虑到星上实现复杂度和系统资源的限制.为此,基于DiffServ的思想,将(m,k)模型应用于地面业务到卫星业务的QoS映射,并通过双漏桶模型在业务增长时对星上数据进行有选择的控制,从而建立了一个实现复杂度低且可以有效保证综合业务QoS的星上交换框架.系统建模仿真结果表明,该设计方案在节省星上缓存资源的同时提高了系统性能,对业务的突发具有较好的平滑性.

Design and Simulation of DiffServ-oriented on-board Switch

The design of the on-board switches should satisfy two contradict requirements. On the one hand, it should consider providing a good QoS (Quality of Service) for multimedia services, and on the other hand, it should take into accountant the restriction of power consumption, buffer capacity and available technology of the space application. Therefore, based on the concept of DiffServ (Differentiated Service), an on-board switch framework was proposed, which satisfied QoS performance requirements and maintained a fairly low complexity. The (m, k) model was applied to the mapping between the terrestrial and satellite network traffic and the double-LB (leak bucket) model was used to control the traffic efficiently. Simulation results show that the scheme significantly improves the QoS performance, smoothes the burst traffic and saves the on-board buffer reservation.