International Journal of Computer Applications
Energy consumption is one of the important challenge in WSNs deployment and applications. This is because power of WSNs is limited by battery which is difficult if not impossible to replace or recharge in some manner in the sensor nodes. Power consumption can be controlled in WSNs in more than one layer. In this paper, power efficiency problems and techniques of enlarging battery life using WSNs physical layer are investigated in the second layer MAC sub-layer. The latter has been achieved using the multiple access techniques, TDMA and CDMA.