Stochastic QoS performance analysis of DiffServ-based wireless sensor network

In wireless sensor network (WSN), real-time network applications require good quality-of-service (QoS) guarantees, such as low packet delay and small backlog. Differentiated services (D-iffServ) mechanism is proposed to satisfy the QoS requirements in WSN. The stochastic characteristics need to be considered for the QoS performance analysis of DiffServ-based WSN. However, the existing works merely derive the average packet delay and backlog in steady states. In this paper, we use stochastic network calculus (SNC) to analyze the stochastic per-flow delay and backlog in DiffServ-based WSN. Firstly, the stochastic service curve for each data flow is derived under strict priority (SP) service scheduling discipline. Then, stochastic per-flow delay and backlog bounds are obtained. As a comparison, we also analyze the stochastic per-flow QoS performances without DiffServ mechanism. Finally, a numerical experiment is conducted with (ρ(ε),σ (ε))-constrained traffic process.