´ Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Frederik Petre Wireless Research, Interuniversity Micro-Electronics | EURASIP Journal on Wireless Communications and Networking 2005 3 271-274 2005 Hindawi Publishing Corporation Editorial Frederik Petre Wireless Research Interuniversity Micro-Electronics Center IMEC Kapeldreef 75 3001 Leuven Belgium Email Ahmet Kondoz Centre for Communication Systems Research CCSR University of Surrey Guildford GU2 7XH UK Email Stefan Kaiser DoCoMo Communications Laboratories Europe GmbH Landsberger Str. 312 80687 Munich Germany Email kaiser@ Ashish Pandharipande Communication and Networking Lab Samsung Advanced Institute of Technology . Box 111 Suwon 440-600 Korea Email 1. BACKGROUND Future-generation wireless systems aim to support a spectrum of services over a variety of networks in a way transparent to the user. Flexibility and adaptivity are key ingredients of such future-generation wireless systems in order to deliver optimal quality of service QoS for different applications over diverse communication environments. Rather than relying on the traditional horizontal communication model consisting of a single wireless access system these future 4G systems will employ a vertical communication model which integrates different existing and new evolving wireless access systems on a common IP-based platform to complement each other for different service requirements and radio environments. To enable seamless and transparent interworking between these different wireless access systems or communication modes through horizontal intrasystem and vertical intersystem handovers multimode functionality is needed to support the different existing air interfaces and the newly emerging ones. It is expected that multimode capabilities will be ultimately focussed on the terminal side to target a larger market base. New challenges then appear in terms of minimizing the terminal cost size and power consumption while at the same time maximizing its flexibility with respect to .
