Reliable Video Multicasting over WLANs

Öz

As is known reliable multicast transmission is not addressed in WLANs. Multicast packets are sent over wireless channels without using medium access control (MAC) layer automatic repeat request (ARQ) mechanism. Therefore, packet error rates will be very high. This paper investigates reliable video multicasting, which became a very popular application, over WLANs. To this end, application layer forward error correction (AL-FEC) codes based on Raptor Q can be used as a means to provide reliable delivery of the multicast video encoded with the H.264/Advanced video coding (AVC) codec. Since video streaming applications have very stringent Quality of Service requirements (low delay and error free transmission of packets), the Raptor Q and the H.264/AVC parameters have to be determined depending on the QoS of the video. Therefore, in this work an advanced cross-layer simulator was developed to analyse the performance of the end-to-end system. Simulation results show that using AL-FEC significantly improve the received video quality, i.e., the mean peak signal to noise ratio (PSNR) is improved over 34 dB. Further that it is shown that frequently inserting intra-frame results in poor video quality. Therefore, it is suggested to send intra frame at longer intervals.

Anahtar Kelimeler

• AL-FEC,Multicast,Video streaming,H.264/AVC

Kaynakça

1. 3GPP TS 26.346 V8.0.0, 2008. Universal mobile telecommunications system (UMTS); multimedia broadcast/multicast service (MBMS); Protocols and codecs.
2. Afzal J, Stockhammer T, Gasiba T, Xu W, 2006. System design options for video broadcasting over wireless networks. 3rd IEEE Consumer Communications and Networking Conference, Las Vegas, January 8-10, 2006, pp: 938-943.
3. Chen MN, Lin CW, Chen YC, 2007. Adaptive error-resilience transcoding and fairness grouping for video multicast over wireless networks. IEEE Internatıonal Communications Conference ICC, Glasgow, June 24-28, 2007, pp: 1661-1666.
4. Choi M, Sun W, Koo J, Choi, S, Shin KG, 2014. Reliable video multicast over Wi-Fi networks with coordinated multiple APs. IEEE Conference on Computer Communications, Toronto, April 27- May 2, 2014, pp: 424-432.
5. Erceg V, Schumacher L, Kyritsi P, et al., 2004. TGn Channel Models. IEEE Tech. Rep. 802.11- 03/940r4, May 10.
6. Ferre P, 2006. Cross-Layer Analysis for Video Transmission over COFDM-based Wireless Local Area Networks. University of Bristol Ph.D. Thesis (Printed).
7. H.264/AVC reference software, 2015. http://iphome.hhi.de/suehring/tml/ (Date of access: 11 September 2015).
8. Haratcherev I, Taal J, Langendoen K, Lagendijk R, Sips H, 2006. Optimized Video Streaming over 802.11 by cross-layer signalling. IEEE Communications Magazine, 40(1): 115-121.

9. IEEE Std 802.11, 2012. International Standard for Information Technology –Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific Requirements – Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications.
10. ITU-T Recommendation H.264, 2009. Advanced Video Coding for Generic Audio visual Services. ISO/IEC 14496-10 (2009): Information Technology - Coding of Audio-visual Objects - Part 10: Advanced Video Coding.
11. Ma J, Feng X, Liu Y, Tang B, 2005. Video multicast over WLAN. IEEE International Symposium on Communications and Information Technology, Beijing, October 12-14, 2005, pp: 1400-1403.
12. Lee S, Chung K, 2008. Joint Quality and Rate Adaptation Scheme for Wireless Video Streaming. IEEE 22nd International Conference on Advanced Information Networking and Applications, Okinawa, March 25-28, 2008, pp:311-318.
13. Samokhina M, Suwon K, Moklyuk K, Choi S, Seoul K, Heo J, 2008. Raptor code-based video multicast over IEEE 802.11 WLAN. Conference of Asia Pacific Wireless Communications Symposium, 2008.
14. Shokrollahi A, 2006. Raptor codes. IEEE Transactions on Information Theory, 52(6): 2551–2567.
15. Shokrollahi A., Luby M, 2011. Raptor Codes. Foundations and Trends in Communications and Information Theory, 6(3), 213–322.
16. Stockhammer T, Hannuksela MM, Wiegand T, 2003. H.264/AVC in Wireless Environments. IEEE Transactions on Circuits and Systems for Video Technology, 13(7): 657–673.
17. Van der Schaar M, Turaga D, 2007. Cross-layer optimization and retransmission strategies for delay sensitive multimedia transmission. IEEE Transaction on Multimedia, 9 (1):185-197.
18. Wan L., Tsai S, Almgren M, 2006. A fading-insensitive performance metric for a unified link quality model. Wireless Communications and Networking Conference, Las Vegas, 3-6 April, 2006, pp: 2110-2114.
19. Wiegand T, Sullivan G, Bjontegaard G, Luthra A, 2003. Overview of the H.264/AVC Video Coding Standard. IEEE Transactions on Circuits and Systems for Video Technology, 13(7): 560-576.