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根据卫星光交换网络应用需求,借鉴现有的地面光交换信道调度算法,综合考虑资源预留和调度算法,提出了一种基于突发流资源预留的星载光交换信道调度算法。通过流量估计把突发数据按照目的地址和突发区服务质量(QoS)区分为单个突发和突发流,并分类进行资源预留。把数据信道按照优先级划分成不同的信道。不同优先级的突发包先搜索对应级别的信道,高优先级的或者突发流可以抢占低优先级的信道。理论分析与仿真比较证明,该算法不但降低了光交换矩阵的重置时间和交换时延,也提高了链路利用率。复杂度在最坏情况下与可插空最近可用未调度信道(LAUC-VF)方式相同,丢包率在负载为0.5时平均达到10-7,适用于星载光交换系统。
According to the application requirements of satellite optical switching network and the existing terrestrial optical switching channel scheduling algorithm, considering the resource reservation and scheduling algorithms, this paper proposes a scheduling algorithm for on-board optical switching channel based on resource reservation of burst resources. Through the traffic estimation, the burst data is divided into single burst and burst flow according to the destination address and the quality of service (QoS) of the burst, and the resources are reserved by classification. The data channels are divided into different channels according to priority. Bursters of different priorities first search for channels of corresponding levels, and high priority or burst streams can preempt lower priority channels. Theoretical analysis and simulation show that this algorithm not only reduces the reset time and exchange delay of the optical switching matrix, but also improves the link utilization. In the worst case scenario, the complexity is the same as that of the LAUC-VF, and the packet loss rate is 10-7 when the load is 0.5. It is suitable for the space optical switching system.