基于QoS的卫星网络端-端通信可靠性分析

针对卫星网络动态环境下的高速信息传输、业务类型差异大等特点，提出一种综合考虑各业务QoS（Quality of Service）指标的可靠性分析方法。在卫星通信网络实际运行周期内，通信系统往往处于逐渐劣化过程中，导致卫星的节点和链路除正常工作和完全失效外，还存在部分失效的工作状态。本文在链路多状态基础上基于最小路集算法（Minimum Path Set Algorithms，MPSA）在不同业务的QoS指标（时延、带宽和丢包率）约束下，得出满足该业务QoS约束的所有可靠路径集，对路径集中路径进行不交化处理得到网络端-端可靠性。研究结果表明，不同业务由于QoS需求的差异导致网络端-端可靠性不同，所提算法与传统算法相比更加符合实际。由于实际卫星网络环境中会采用端-端并行多路径传输（Multi-Path Transmission，MTP），本文在上述研究的基础上，进一步对多路径的端-端可靠性进行了研究，结果表明多路径数据传输可靠性高。

Reliability analysis of end-to-end communication in satellite networks based on QoS

To address the high-speed information transmission in satellite network dynamic environment and large differences of service types, a reliability analysis method that considers the Qualiby of Service (QoS) index constraints of different services is proposed. In the actual operation period of satellite communication network, the communication system is often in the process of gradual deterioration, which leads to the normal operation and complete failure of satellite nodes and links, but also part of the failure. In this paper, on the basis of multi state links, based on Minimum Path Set Algorithms (MPSA), under the constraints of QoS indexes (delay, bandwidth and packet loss rate) of different services, all reliable path sets satisfying the QoS constraints of the service are obtained, and the end-to-end reliability of the network is obtained by non intersection processing of path centralized paths.The results show that different services have different end-to-end reliabilities due to different QoS requirements, and the proposed method is more realistic than traditional methods. In addition, since the end-to-end parallel Multi-Path Transmission(MPT) is used in the actual satellite network, on the basis of the above research, this paper further studies the end-to-end reliability of multi-path data transmission. The results show that the multi-path data transmission has high reliability.