A Cross Layer Method for Efficient Video Delivery Based on TPGF Routing in WMSN

In this paper, we propose a QoS-aware method for multimedia streaming that uses cross-layer information (application layer and physical layer) in Wireless Multimedia Sensor Networks (WMSNs). Our goal is to use cross layer information to route video packets efficiently and deliver a higher quality video in streaming applications. Our QoS-Aware Multi-Path Selection (QAMPS) method is hased on multi-path multi-priority selection algorithm that uses Two-Phase geographic Greedy forwarding (TPGF) as a routing algorithm. The proposed method improves QoS by splitting video streams into I-frames, P-frames and B-frames in the application layer and passes them to the network layer for routing packets in three different classes. The differentiation is based on Bit Error Rate (BER) and delay of the paths. These parameters determine the best paths for sending I, P and B-frame streams separately. Finally, the comparison of QAMPS with Context-Aware Multi-path Selection (CAMS) scheme that sends video stream without classification of frames shows a better quality. The proposed method has better PSNR and decreases the frame loss ratio by about ۲۰ percent in average compared to CAMS.

Keywords:

Wireless Multimedia Sensor Network , Cross Layer , QoS