Energy-aware utility optimisation for joint multi-path routing and MAC layer retransmission control in TDMA-based wireless sensor networks
Meng Zheng, Wei Ge Liang, Haibin Yu, Yang Xiao, Jianda Han · International Journal of Sensor Networks · 2013
This paper formulates a novel energy–aware utility optimisation (EUO) problem for joint multi–path routing and medium access control (MAC) layer retransmission control in time division multiple access (TDMA)–based wireless sensor networks (WSNs). As the EUO problem is non–convex and inseparable, we propose a heuristic method called Successive Alternating Convex Approximation (SACA) to approximately solve the problem. More precisely, we decompose the EUO problem into two alternating convex sub–problems, namely energy–aware multi–path routing and retransmission control. On one hand, given the time slot allocation, the multi–path routing balances the energy consumption within WSNs. On the other hand, provided the traffic distribution, retransmission control enhances the data reliability in the most energy–efficient way. These two sub–problems are solved recursively by means of dual decomposition. The sequence of optimal solutions to these two sub–problems is shown to converge to some steady–state point that approximates a solution to the EUO problem.