Multimedia Over Wireless and Mobile Networks

The rapid developments in computer and communication technologies have made ubiquitous computing a reality. From cordless phones in the early days to later cellular phones, wireless mobile communication has been the core technology that enables anywhere and anytime information access and sharing. The new generation of smart mobile devices that emerged only in recent years are driving the revolution further. Multimedia over wireless and mobile networks share many similarities as over the wired Internet; yet the unique characteristics of wireless channels and the frequent movement of users also pose new challenges that must be addressed. This chapter reviews wireless channel characteristics, and describes representative wireless technologies for wide-area cellular networks (from 1G to 4G) and local area networks (WiFi and Bluetooth). We then examine the key issues for multimedia over wireless networks, including error detection and correction, error-resilient coding, error concealment, and re-synchronization. Finally, we examine mobility management, including both the network layer mobile IP and the link layer handoff.

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