Adaptive Application-specific Cooperative Relay for Wireless Video Sensor Networks

In this paper, we propose an adaptive application-specific cooperative relaying mechanism for delivering layered coded multimedia data over wireless sensor networks. The proposed approach is to optimally map source data layers of different perceptual importance to relay nodes, so that the most important data layer can be transmitted in high quality. Each relay node only needs to detect and forward the assigned sub-streams (layers) of multimedia data. The distinctive benefit of this approach is to minimize the video distortion induced by buffer overflow and delay violation, while reducing transmission processing requirements on each relay node and providing significant savings in transmit and receive energy. Experimental results show that, compared with other cooperative methods, the proposed algorithm achieves significant performance improvement.