Date Added: Jan 2011
The main problem in wireless communication networks is the field nodes (mobile or stationary) are battery resource constrained. Consider a situation of multi-hop wireless communication in a sensor network in which the information from a node is transferred to the base station using ad hoc multi hop network. That is, the sensed information from a field sensor node is forwarded by multiple intermediate nodes until information reaches the base station. If one of the nodes which participate in multi-hop forwarding is switched off due to low battery power, the network is disconnected and the field information could be lost on the way. While energy efficiency of communication protocols tries to ensure extended network lifetime, battery drainage problem still remains.