Intelligent stale-frame discards for real-time video streaming over wireless ad hoc networks

Authors:
Tsang-Ling Sheu;Yung-Shih Chi
Affiliations:
Center for Wireless Multimedia Communications, Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan;Center for Wireless Multimedia Communications, Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan
Venue:
EURASIP Journal on Wireless Communications and Networking
Year:
2009

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Abstract

This paper presents intelligent early packet discards (I-EPD) for real-time video streaming over amultihop wireless ad hoc network. In a multihop wireless ad hoc network, the quality of transferring real-time video streams could be seriously degraded, since every intermediate node (IN) functionally like relay device does not possess large buffer and sufficient bandwidth. Even worse, a selected relay node could leave or power off unexpectedly, which breaks the route to destination. Thus, a stale video frame is useless even if it can reach destination after network traffic becomes smooth or failed route is reconfigured. In the proposed I-EPD, an IN can intelligently determine whether a buffered video packet should be early discarded. For the purpose of validation, we implement the I-EPD on Linux-based embedded systems. Via the comparisons of performance metrics (packet/frame discards ratios, PSNR, etc.), we demonstrate that video quality over a wireless ad hoc network can be substantially improved and unnecessary bandwidth wastage is greatly reduced.