一种新的星间链路切换保护算法

Novel ISLs Handover Protection Algorithm

星间链路切换将严重影响卫星网络的通信性能,需要对切换链路加以保护,这方面的研究目前还很欠缺。为此,给出一种新颖的星间链路切换保护(ISLHP)算法,该算法可同时生成业务路径和备份路径,且具有最小的综合费用(包括备份费用和业务费用)。算法采用本地链路保护,为星间链路切换提供快速恢复,并利用星间链路切换的可预测性和备份资源的可共用性,通过降低需要保护的链路数,减少闲置的备份资源,来提高网络资源的利用率。仿真结果表明:该算法具有切换恢复时间短,网络资源利用率高等优点。

The handover of inter satellite links（ISLs） may affect the performance of satellite network violently, so the handover links must be protected. In this paper, a novel ISLs handover protection（ISLHP） algorithm is proposed. To one of services, this algorithm can create the active path and backup paths at one time. And the costs of the active path and backup paths are the lowest. To make the handover links quick recovery, the local links protection mechanism is considered. However, this mechanism may be expensive in the additional network capacity needed, especially for satellite networks. By considering the predictive nature of the ISLs handover and the share restoration capacity of backup paths, the backup path number needed for one service and the backup resource which is idle can be decreased. So the network resource can be used efficiently in this algorithm. Correlative simulation indicates that this novel algorithm needs shorter recovery time, fewer back path number and additional cost.