Title: SPM: split piecewise mapping for high quality wireless video delivery

Authors: Wen-Ping Lai; Wei-Hao Fu

Addresses: Department of Communications Engineering, Yuan Ze University, 135 Yuan-Tung Rd., Chung-Li, Taiwan. ' Department of Communications Engineering, Yuan Ze University, 135 Yuan-Tung Rd., Chung-Li, Taiwan

Abstract: Multiple prioritised access category (AC) queues and virtual collision handling among them are the main mechanism of the IEEE 802.11e EDCA for multimedia service differentiation. However, the AC for video (AC_VI) is characteristic of FIFO, and thus its performance is limited. For further performance enhancement, differentiation among video packets can help. This study presents a novel cross-layer design combining the error propagation length (EPL) scheme in the application layer allowing each video frame in a group of pictures to have its own importance level, and our proposed split piecewise mapping (SPM) algorithm in the MAC layer offering a corresponding mapping probability function for each importance level of video packets among the AC queues. The results show that the proposed EPL+SPM design outperforms the existing ones, with largest achieved gains as high as 2.8 dB over I/P+PM, 4.1 dB over I/P+AM and 7.4 dB over EDCA.

Keywords: congestion control; cross-layer design; wireless video; 802.11e; AQM; QoS; quality of service; SPM; split piecewise mapping; video delivery; error propagation length; EPL; medium access control; MAC; access category queues.

DOI: 10.1504/IJSSC.2012.048899

International Journal of Space-Based and Situated Computing, 2012 Vol.2 No.3, pp.187 - 200

Received: 05 Apr 2012
Accepted: 29 Jun 2012
Published online: 30 Sep 2014 *

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