关键词: 无线传感网络, 服务质量, 严格优先级队列调度, 端到端时延

Abstract: In order to improve QoS (quality of service) of WSN (wireless sensor network) under the worst-case condition, which is particularly relevant for those time-sensitive WSN application, this paper applies the SP (strict priority) scheduling strategy to the cluster-tree WSN and analyzes how the strategy will impact the service guaranteed to data flows. The closed-recurrent expressions of calculating the worst-case end-to-end delay and queue length are derived based on DNS (deterministic network calculus). Finally, we illustrate that the scheduling strategy can improve the maximum end-to-end delay, while increase buffer requirements of sensor nodes, with numerical analysis.

Key words: WSN, QoS, SP scheduling, end-to-end delay