Mobile IP - DECT Internetworking Architecture Supporting IMT - 2000 Applications

ommercial deployment of mobile multimedia services has been hindered by factors such as low data rate, high service costs, lack of or slow standardization , and the form factor of wireless hand-sets. The third-generation (3G) mobile technologies, generically known as International Mobile Telecommunications 2000 (IMT-2000), provide fast wireless Internet access and are anticipated to reduce the impact of these issues. Device cost and form are improved by the realization of Moore's law. IMT-2000 aims to merge paging, cordless, cellular, and satellite networks to support mobile multimedia applications requiring low to high bit rates in different mobility scenarios. The current impetus toward convergence of computer (Internet), video, and voice networks will speed up the realization of mobile multime-dia communications (MMC). Also, with continuing advancement of image and video coding technologies, even high-bandwidth applications may be supportable in future by IMT-2000 technologies at cell fringes and in rural areas experiencing data rates in the range 384–144 kb/s. Recently, we have witnessed frenetic and continuing advancement in and demand on the communications industry. However, important questions arising from these developments include whether costs will allow customers to follow the technological bandwagon; and what percentage of the world's population can afford to utilize the technologies being developed. Such questions render cost reduction an indispensable part of the technological wave. To fulfill users' demand for advanced telecom services at moderate costs, and to reduce the time to market of services, the infrastructure of most 2G technologies (notably, Global System for Mobile Communications , GSM, and Digital Enhanced Cordless Telecommunications , DECT) is being leveraged through continuing upgrading. For instance, Fig. 1 shows the GSM-based evolution of mobile services from low-rate circuit-switched data (CSD) and Short Message Service (SMS) communications to high-resolution fourth-generation (4G) MMC [1]. Also shown in the figure are the High Speed Circuit Switched Data (HSCSD), the General Packet Radio Service (GPRS) and the Enhanced Data Rates for Global/GSM Evolution (EDGE), their theoretical data rates, and projected commercial rollout schedules. We expect 4G mobile technologies to offer even higher bit rates than IMT-2000 technologies to support " bandwidth-ravenous " applications. Since high data rates result in small time-division multiple access (TDMA) bit duration (since the smaller the bit duration, the worse the signal immunity against multipath effects) and high code-division multiple access (CDMA) code chip rates, 4G mobile systems are envisaged to deploy orthogonal frequency-division multiplexing (OFDM). On the network level, the Internet …