一种新的基于中继的重叠网络多径QoS动态评价协议

New Dynamic Evaluation Protocol of Multipath QoS Based on Relay in Overlay Network

面向路径选择的重叠网络中继路径QoS(Quality of Service,服务质量)测量和评价,尚未有完善的技术方案;在实时传输相关的路径评价方面,可以使用RTCP协议(Real-time Transport Control Protocol,实时传输控制协议)以统计分析的方式对时延、时延抖动、带宽、丢包率等内容进行评价,但这些评价都是针对单径和"端到端"的,并不能有效地应用于多径传输控制.本文结合应用需求,提出一种新的基于中继的重叠网络多径QoS动态评价协议(MRP-RTCP),协议基于中继节点类型提出路径稳定度作为新的QoS评价参数,给出了相关的交互消息格式,仿真测试结果显示,该协议能实时准确判断路径QoS,多径实时媒体传输应用中的路径选择准确度及速度有较大提高.

There isn＇t sophisticated technical solution for measurement and evaluation of relay path QoS which aim at path choice in the overlay network. RTCP protocol can be used for path evaiuation of real-time transmission on the basis of delay ,jitter, bandwidth and packet loss ratio in the way of statistical analysis. But the evaluations are all for a single path and end to end which can＇t be used for multipath transmission control effectively. According to the application needs, the paper presents a new dynamic evaluation protocol （ MRP-RTCP） of multipath QoS based on relay in the overlay network. Basing on the type of relay node it proposes the degree of path stability as the new evaluation parameter of QoS and gives the format of related interactive message. The simulation results show that the protocol can judge path QoS accurately, the accuracy and speed of path choice are enhanced greatly in the application of multipath real-time media transmission.