Geographic Routing In Duty-cycled Wireless Multimedia Sensor Networks

The Wireless Multimedia Sensor Networks(WMSNs) are one sub branch of WSNs, which are applied to transmit multimedia video and audio stream specially. It is a challenge to use WSNs to transmit multimedia streams for two reasons:the end-to-end delay requirements of multimedia applications are tiny, and the bandwidth of WSNs and the energy of each node are limited. Currently, among the various routing algorithms of WSNs, the geographic routing can satisfy the requirements of WMSNs using multipath routing to split the huge data stream into several node disjoint paths. However, almost all the geographic routings use the too ideal network model that the node in the network should be always awake instead of duty-cycle mechanism, which may cause too much waste of energy, and may cause some nodes to run out of their power and finally make the whole system die.In order to make the geographic routing suit to the needs of the real applications of the WMSNs, this paper focused on the performance of geographic routing in random duty-cycled sensor networks, which release the condition that all the sensor nodes in the network should be awake all the time in traditional geographic algorithms. A new routing algorithm called McTPGF has been purposed, using new routing metrics. Simulations are conducted to show that the end-to-end delay of McTPGF is much lower than that of traditional geographic routing algorithms in duty-cycled networks, and at the same time, supports the transmission of multimedia stream in WMSNs much better.