A New Priority Support Scheme for Asymmetric Multi-hop Wireless Sensor Networks

Providing priority support for shared MAC-based multi-hop wireless sensor network is a very challenging issue. It is even more difficult to provide priority for traffic with lower data rate connection in the asymmetric network. In this paper, we propose a simple scheme to support priority for low data rate traffic in two phases: phase 1, the priority traffic has privilege to access the medium, compared to normal traffic; phase 2, the priority traffic is protected from collision of other traffic via reservation. Simulation results show that higher packet delivery ratio is achieved for priority traffic, even when the priority traffic data rate is much lower than normal traffic.