ABSTRACT
This chapter summarizes studies on exploring the scalability of Scalable Video Coding (SVC) and the quality of service (QoS) provided by the IEEE 802.11e enhanced distributed channel access (EDCA) to achieve an optimal performance for video streaming over wireless local area networks (WLANs). It proposes a practical cross-layer design for transmitting scalable video over IEEE 802.11e WLANs. Using the characteristics of the EDCA queues, we design a stream mapping strategy that adaptively maps packets of scalable video traffic onto two EDCA queues with Unequal loss protection. Distributed coordination function is based on carrier sense multiple access/collision avoidance where stations listen to the medium to determine when it is free. Various SVC schemes have been proposed in the literature. Some of them utilize wavelet transform, either entirely based on Three- dimensional wavelet or combining wavelet transform with motion compensated predictive coding. The application layer and network sublayer cooperate to decide the optimal transmission strategy for the scalable video stream.
