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spaper08 - 1140 IEEE TRANSACTIONS ON MULTIMEDIA VOL 11 NO 6...

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1140 IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 11, NO. 6, OCTOBER 2009 A Quality-Driven Cross-Layer Solution for MPEG Video Streaming Over WiMAX Networks Ehsan Haghani , Student Member, IEEE , Shyam Parekh , Senior Member, IEEE , Doru Calin , Senior Member, IEEE , Eunyoung Kim, and Nirwan Ansari , Fellow, IEEE Abstract— Extensive efforts have been focused on deploying broadband wireless networks. Providing mobile users with high speed network connectivity will let them run various multimedia applications on their wireless devices. Satisfying users with dif- ferent quality-of-service requirements while optimizing resource allocation is a challenging problem. In this paper, we discuss the challenges and possible solutions for transmitting MPEG video streams over WiMAX networks. We will briefly describe the MPEG traffic model suggested by the WiMAX Forum. A cross-layer solution for enhancing the performance of WiMAX networks with respect to MPEG video streaming applications is explained. Our solution uses the characteristics of MPEG traffic to give priority to the more important frames and protect them against dropping. Besides, it is simple and compatible with the IEEE 802.16 standards and thus easily deployable. It is shown that the proposed solutions will improve the video quality over WiMAX networks. Index Terms— Cross layer, MPEG, quality-of-service, video, wireless, WiMAX. I. I NTRODUCTION T HE excessive demand for ubiquitous broadband wire- less access has attracted tremendous investment from the telecommunications industry in the development and de- ployment of WiMAX networks. The WiMAX technology is promising to provide broadband wireless access to mobile users in the near future. It is expected that video streaming will be a very attractive application for the rapid deployment of WiMAX networks. The stringent quality-of-service (QoS) requirements including high bitrate and low latency are some of the challenges the service providers and network designers are confronting. Furthermore, the popularity of many online video servers such as YouTube will encourage an increasing number of users to watch video clips on their mobile devices. The scarcity of available bandwidth in wireless networks has called for efficient resource management. WiMAX networks are Manuscript received October 01, 2008; revised April 21, 2009. Current ver- sion published September 16, 2009. This work was conducted when E. Haghani was an intern at Bell Laboratories in 2008. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Aggelos K. Katsaggelos. E. Haghani and N. Ansari are with the Department of Electrical and Com- puter Engineering, New Jersey Institute of Technology, Newark, NJ, 07102 USA (e-mail: [email protected]; [email protected]).
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