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CAT2000 GSM Evolution Towards UMTS IFT6275 By Shouwen Zhang Fuman Jin Slide 2 GSM " Spectrum efficiency " International roaming " Low mobile and base stations costs " Good subjective voice quality " Compatibility with other systems such as ISDN (Integrated Services Digital Network) " Ability to support new services Design criteria Slide 3 GSM G SM-The world leader of digital cellular market GSM networks are operational in over 120 countries with nearly 300 GSM system operators worldwide 254.42 million GSM subscribers at the end of1999. GSM subscribers represented 54.46% of a total world cellular subscriber base of 467.15 million. 462 million phone users by the end of 2001. 733 million GSM subscribers By the end of 2004 Slide 4 Third Generation Wireless Systems to enhance and supersede current systems. provide universal personal communications to anyone, regardless of their whereabouts. It will allow for wireless Internet access, videoconferencing, and other wide-bandwidth applications. Slide 5 The UMTS system consists of two separate parts * The UMTS Terrestrial Radio Access Network (UTRAN): comprising Node B(equivalent to the GSM BTS) and the Radio Network Controller (RNC) * The core network: equivalent to the GSM NSS. Slide 6 Data-rates 144 kbps at mobile speeds 384 kbps at pedestrian speeds up to 2 Mbps in an indoor environment. Slide 7 Third Generation System Slide 8 Migration Path Slide 9 HSCSD Traditional GSM supports one user per channel per time slot. HSCSD gives a single user simultaneous access to m ultiple channels (up to four) at the same time Easy to implement Drawback: the radio resource is reserved Slide 10 Path Suggested Slide 11