On Alleviating Starvation in Wireless Sensor Networks
Current Medium Access Control (MAC) protocols for Wireless Sensor Networks (WSNs) do not support prioritized channel access and often suffer from varying degrees of starvation and fairness problems. That is, with a little bad luck, a sensor node might have to wait arbitrarily long to send its frame, and thus results in the invisibility of some sensed area. In this paper, the authors introduce a simple, but yet well performing starvation free backoff scheme based on Sensor MAC (S-MAC) protocol for WSNs. The proposed scheme allows a sensor node to adjust its backoff window size according to its re-transmission times.