Lifetime elongation of event-driven wireless video sensor networks

This paper proposes a method to prolong the lifetime of event-driven wireless video sensor networks. The proposed method provides the operating point of each node by firstly selecting the route to the sink node in an energy-aware fashion. Then it finds the lifetime-maximal encoding bit-rate utilizing the event statistics and the analytic power consumption models of major functional blocks in the target video sensor node, i.e., video encoder and wireless transceiver. Furthermore, it additionally controls the encoding frame-rate to balance the lifetime of each node within the selected route when the distribution of event occurrence rate is significantly unbalanced. Experimental results show that the proposed algorithm extends the lifetime of the network by 183.53% on average compared with a conventional bit-rate allocation method.