Optimal Duty Cycling and Rate Control for Wireless Sensor and Vehicular Networks

For integrated wireless sensor and vehicular networks, an optimal duty cycle based energy efficient transmission strategy for roadside sensor nodes is proposed. Our energy minimization strategy consists of two components: Duty Cycle Adaptation (DCA) and Packet Length Control (PLC). In the DCA phase, the active time for the node is adjusted in accordance with the probability of arrival of vehicular node and beacon catch. In PLC phase, an optimal packet length for transmission to vehicular node is chosen on the basis of current wireless channel conditions. By employing semi Markov decision based framework, the optimal duty cycle and packet length for successful transmission is obtained as a stochastic policy, which results in the energy conservation of the sensor nodes. The model is flexible and can be realized using look up table approach. Performance evaluation results show the significance of the proposed policy.