Cross-layer QoS Support for Multimedia Delivery over Wireless Internet
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Cross-Layer QoS Support for Multimedia Delivery over Wireless Internet Qian Zhang Microsoft Research Asia 3F, Beijing Sigma Center, 49 Zhichun Road, Haidian District, Beijing 100080, China Email: [email protected]
Fan Yang Microsoft Research Asia 3F, Beijing Sigma Center, 49 Zhichun Road, Haidian District, Beijing 100080, China Email: [email protected]
Wenwu Zhu Microsoft Research Asia 3F, Beijing Sigma Center, 49 Zhichun Road, Haidian District, Beijing 100080, China Email: [email protected] Received 17 August 2003; Revised 13 June 2004 Delivering multimedia over wireless Internet is a very challenging task. Multimedia delivery inherently has strict quality-of-service (QoS) requirement on bandwidth, delay, and delay jitter. However, the current Internet can only support best-effort service, which imposes varying network conditions during multimedia delivery. The advent of wireless networks further exacerbates the variance of network conditions and brings greater challenges for multimedia delivery. To improve perceived media quality by end users over wireless Internet, QoS supports can be addressed in different layers, including application layer, transport layer, link layer, and so forth. This paper presents a framework, which provides QoS support, for multimedia delivery over wireless Internet, across different layers. To provide efficient QoS support for different types of media over the best-effort networks, we first propose a cross-layer architecture, which combines the application-level, transport-layer, as well as link-layer controls, and then review recent advances in each individual component. Specifically, dynamic estimation of varying channel and network, adaptive and energy-efficient application and link-level error control, efficient congestion control, header compression, adaptive automatic repeat request (ARQ) and priority-based scheduling, as well as QoS-adaptive proxy caching technologies are explicitly reviewed in this paper. Keywords and phrases: cross-layer design, video streaming, wireless Internet, congestion control, resource allocation.
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INTRODUCTION
With the explosive growth of the Internet and dramatic increase in wireless access, there is a tremendous demand on multimedia delivery over wireless Internet. The third generation (3G) wireless networks, foreseen to be the enabling technology for multimedia services with up to 384 kbps outdoor and 2 Mbps indoor bandwidth, makes it feasible for multimedia communication over the wireless link [1]. Moreover, the proliferation of 802.11 systems, that can provide up to 100 Mbps bandwidth, has extended the role of traditional Internet to support media streaming services in the air [2]. However, multimedia over wireless Internet poses many challenges as follows. Different QoS requirements for different types of media In general, different types of media have different characteristics. Specifically, real-time media such as video and audio
is delay-sensitive but capable of tolerating a certain degree of errors. Non-real-time media such as Web data is l
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