Scalable Video Coding and Transport over Broadband Wireless Networks

Video application is becoming an important application under the next-generation wireless networks. However, supporting video communication over wireless networks poses many challenges due to uctuations of wireless channel conditions. Scalable video coding and adaptive services have been shown to be capable of coping efectively under time-varying wireless environment. We present an adaptive framework to support quality video communication over wireless networks. The adaptive framework include: (1) scalable video representations, (2) network-aware video application, and (3) adaptive service. Under this framework, as wireless channel conditions change, the mobile terminal and network elements can scale the video streams and transport the scaled video streams to receivers with acceptable perceptual quality. The key advantages the adaptive framework are: (1) perceptual quality is degraded gracefully under severe channel conditions; (2) network resources are e ciently utilized; and (3) the resources are shared in a fair manner.