Analytical model of the LPL with wake up after transmissions MAC protocol for WSNs

The LWT-MAC protocol extends the normal operation of B-MAC by taking advantage of the local synchronization that can be achieved after each packet transmission. Sensor nodes wake up at the end of each successful transmission to send or receive messages eliminating the need for the long preamble transmission. Current LPL analytical models are extremely simple as they do not consider the energy waste due to collisions. In this work, a detailed analytical model of the LWT-MAC protocol, which considers the energy waste of collisions and overhearing for both saturated and unsaturated conditions, is presented. Results show a reduction of the energy consumption as the traffic increases and an improvement, in terms of throughput and delay, compared to B-MAC. Additionally, a performance evaluation is presented in which some key network parameters (check interval, traffic load and the number of sensor nodes) are modified in order to analyze the behavior of the studied LWT-MAC protocol.