TeleMIP: telecommunications-enhanced mobile IP architecture for fast intradomain mobility

networks and services, fueled by next-generation mobile communications systems research, has ushered in the era of ubiquitous computing. Lightweight portable computers, IP-based (office and home) appliances, and the popularity of the Internet are providing strong incentives to service providers to support seamless user mobility. Realizing commercially viable IP mobility support over the current cellular infrastructure, however, remains a research challenge. In particular, for real-time multimedia (audio, video, and text) communications, user mobility poses several challenges. Wireless access to telecommunications services has traditionally been provided through wide-area cellular systems, which in turn are connected to the public telecommunications network backbones such as the public switched telephone network (PSTN). It is expected that future wireless communications systems will be more heterogeneous and that every mobile user will be able to gain access to the Internet backbone by attaching his or her computer to a wireless access point (Fig. 1). A telecommunications architecture that supports IP mobility will enable service providers to offer highquality broadband multimedia services to mobile users in a cost-effective way [1]. Although neither the Internet nor the telecommunication networks are currently designed to support high-bandwidth real-time multimedia services, a series of new technologies for third-generation (3G) wireless systems are being developed to make things a reality. These technologies include International Mobile Telecommunications (IMT2000), Universal Mobile Telecommunications System (UMTS), General Packet Radio Service (GPRS), Enhanced Data Rate for GSM Evolution (EDGE), code-division multiple access (CDMA-2000), and wideband CDMA (WCDMA).