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Title: IEEE 802.11e無線網路下影像串流之MAC-centric跨層設計
MAC-centric Cross-Layer Design for Video Streaming in IEEE 802.11e Wireless Network
Authors: 蘇毓迪
Su,Yu Ti
Contributors: 張宏慶
Jang,Hung Chin
Su,Yu Ti
Keywords: 無線網路
IEEE 802.11e
IEEE 802.11
video streaming
retry limit
Date: 2007
Issue Date: 2009-09-17 14:03:48 (UTC+8)
Abstract: 近十年來,由於無線網路的普及與人們對於影像串流服務的需求愈高,導致人們迫切需要更好的服務品質。但在IEEE 802.11無線網路中,本身的設計並非針對影像串流來設計,為讓影像串流能在無線網路更有效率,我們必須重新設計適合影像串流的無線網路。本研究首先探討IEEE 802.11 MAC層DCF (Distributed Coordination Function)與802.11e EDCA (Enhanced Distributed Channel Access)機制的潛在問題。由於DCF與EDCA並未特別對影像串流做設計,會導致具有時延(delay time)限制的影像封包等待過久造成失效,卻仍繼續傳送。本研究提出幾個有效方法,改善原本IEEE 802.11無線網路對影像串流傳輸效能不彰的現象。我們將利用跨層設計使MAC層能取得影像串流封包資訊,並改善DCF與EDCA的重傳(retransmission)機制,使用time limit與retry limit混和設計節省不必要的等待時間,並使用single-video multi-level queue改善傳輸效能。最後本研究將利用網路模擬器NS-2 (Network Simulater ver. 2)與影像串流測試實驗架構myEvalvid-NT作不同效能的驗證比較並評估我們所提出方法的有效性。
Over the past decade, wireless network access and video streaming services have become more popular than ever. People are eager to have better quality of video streaming services over wireless network. However, IEEE 802.11 DCF and IEEE 802.11e EDCA are not specifically designed for video streaming. This leads to the problem of transmitting overdue video packets and thus degrades both the network performance and video quality. In this paper, we propose a hybrid design framework to improve the quality of video streaming. This framework consists of a MAC-centric cross-layer architecture to allow MAC-layer to retrieve video streaming packet information (slice type and transmission deadline), a retransmission mechanism of hybrid retransmission deadline and retry limit to save unnecessary packet waiting time, and a single-video multi-level queue to prioritize I/P/B slice delivery. Simulations show that the proposed methodology outperforms IEEE 802.11e, IEEE 802.11e Timebase and IEEE 802.11e MultiQ in packet loss rate, invalid packet ratio, lost and invalid packet ratio, delay time, jitter, and PSNR.
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[2] IEEE Std 802.11e-2005, "Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 8: Medium Access Control (MAC) Quality of Service Enhancements," November 2005.
[3] Thomas Wiegand, Gary J. Sullivan, Gisle Bjontegaard and Ajay Luthra, “Overview of the H.264 / AVC Video Coding Standard,” IEEE Trans. on Circuits and Systems for video technology, vol. 13, Issue 7, pp. 560-576, July 2003.
[4] M. Lu, P. Steenkiste, and T. Chen, "Time-based Adaptive Retry for Wireless Video Streaming," Wireless Communications and Mobile Computing, Special Issue on Video Communications for 4G Wireless Systems, Jan 2007.
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[8] Gary J. Sullivan, Pankaj N. Topiwala and Ajay Luthra, “The H.264/AVC Advanced Video Coding Standard: Overview and Introduction to the Fidelity Range Extensions,” Applications of Digital Image Processing XXVII. Edited by Tescher, Andrew G. Proceedings of the SPIE, Volume 5558, pp. 454-474, Nov. 2004.
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[13] L. Haratcherev, J. Taal, K. Langendoen, R. Lagendijk and H. Sips, “Optimized Video Streaming over 802.11 by Cross-Layer Signaling,” IEEE Communications Magazine, Volume 44, Issue 1, pp.115-121, Jan. 2006.
[14] S. Mangold, Sunghyun Choi G.R. Hiertz, O. Klein and B. Walke, “Analysis of IEEE 802.11e for QoS support in wireless LANs,” IEEE Wireless Communications, Volume 10, Issue 6, pp.40-50, Dec. 2003.
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[16] YUV Video Sequences
[17] H.264/AVC Reference Software
[18] An IEEE 802.11e EDCA and CFB Simulation Model for ns-2
[19] Chia-Yu Yu, Chih-Heng Ke, Ce-Kuen Shieh and Naveen Chilamkurti, “MyEvalvid-NT - A Simulation Tool-set for Video Transmission and Quality Evaluation,” TENCON 2006. 2006 IEEE Region 10 Conference, pp.1-4, Nov. 2006.
[20] J. Klaue, B. Rathke, and A. Wolisz, "EvalVid - A Framework for Video Transmission and Quality Evaluation", In Proc. of the 13th International Conference on Modelling Techniques and Tools for Computer Performance Evaluation, pp. 255-272, Sep. 2003.
[21] PSNR in wikipedia
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