This paper describes the mobility management mechanisms for mobile telecommunications networks. There are two major types of mobility: radio network mobility and core network mobility. Radio network mobility supports radio link switching of a mobile user during conversation, and core network mobility provides roaming and tunnelrelated management for packet re-routing due to user movement. Impact of mobility on both the radio and the core networks is addressed in this paper. Also, potential research issues on these topics are discussed.

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Based on media gateway control protocol (MGCP), this paper describes GSM‐IP, a voice over IP service for GSM mobile network. With the signaling protocol translation mechanism provided by the MGCP signaling gateway, we demonstrate how to interwork the MGCP elements with the home location register, visitor location register and mobile switching center in the GSM network. Then we present the message flows for GSM‐IP registration, call origination, call delivery, call release and inter‐system handoff procedures. We show the feasibility of integrating GSM with the MGCP‐based VoIP network without modifying the GSM network. Furthermore, our approach does not introduce new protocol primitives to MGCP. Copyright © 2001 John Wiley & Sons, Ltd.

Recently, the Internet has become the most important vehicle for global information delivery. As consumers have become increasingly mobile in the recent years, introduction of mobile/wireless systems such as 3G and WLAN has driven the Internet into new markets to support mobile users. This chapter is focused not only on QoS support for multimedia streaming but also dynamic session management for VoIP applications: As the types of user devices become diverse, mobile networks are prone to be “heterogeneous.” Thus, how to effectively deliver different quality levels of content to a group of users who request different QoS streams is quite challenging. On the other hand, mobile users utilizing VoIP services in radio networks are prone to transient loss of network connectivity. Disconnected VoIP sessions should be effectively detected without introducing heavy signaling traffic. To deal with the above two issues, an efficient multimedia broadcasting/multicasting approach is introduced to provide different levels of QoS, and a dynamic session refreshing approach is proposed for the management of disconnected VoIP sessions.