SpaceFibre星载数据网络低延时确定性调度算法

Deterministic scheduling method with low latency for SpaceFibre

针对超高速SpaceFibre星载网络中多源数据传输的确定性和实时性应用需求,提出一种分类细粒度低延时确定性调度算法。该算法基于差异化调度策略的思想,将数据流划分为三类。为实现网络资源的细粒度分配,引入扩展时隙。该算法采用无冲突均匀调度方法,降低了数据包的平均排队延时。为适应有效载荷组网的航天应用场景,该算法兼顾网络拓扑结构生成调度方案。为验证算法有效性,在OPNET仿真平台下利用自定义建模技术搭建网络仿真模型。仿真结果表明:相比优先权调度和无冲突连续调度机制,该算法实现了时间敏感数据流的确定性传输;随着时隙数目的增加,网络的延时性能和抗抖动性能显著提升,吞吐量性能得到保证;该算法具有一定的航天工程实用价值。

In order to achieve the deterministic transmission of diverse data streams in a short time on the SpaceFibre network,the fine-grained low-latency deterministic scheduling algorithm with classification was proposed.According to the differentiated scheduling strategy,space tasks were divided into three types.For the efficient allocation of resources,the extended time-slot was introduced.The uniform distribution of time-slot without conflict reduced the average delay of data packets.To adapt to aerospace applications where payloads were connected with a network,the method generated scheduling vectors based on the network topology.The simulation model of the SpaceFibre network in OPNET was built to verify the effectiveness of the method.Experimental results show that the scheduling scheme generated by the method has better certainty than the classic scheduling based on priority and conflict-free consecutive scheduling;with the increment of the number of time slots,the average delay and jitter of each traffic are reduced,and the throughput is guaranteed.Therefore,the method has certain practical application value in aerospace engineering.