Transcript Slide 1
UMTS A GLOBAL MOBILE SYSTEM TOPICS OF DISCUSSION • • • • • • • • • • • WHAT IS UMTS BRIEF HISTORY OF UMTS TYPES OF UMTS SYSTEM SPECIAL FEATURES OF UMTS TECHNOLOGY BEHIND UMTS NETWORK STRUCTURE OF UMTS SPECTRUM OF UMTS ADVANTAGE OVER GSM AND CDMA APPLICATION OF UMTS UPGRADATION OF UMTS FUTURE ASPECTS OF UMTS WHAT IS UMTS? UMTS is Universal Mobile Telecommunication System. It is one of the THIRD GENERATION(3G) mobile phone technology • It is standardized by 3GPP, and is the European answer to the ITU IMT-2000 requirements for 3G cellular radio systems It is an evolution of GSM technology UMTS, the 3G successor to GSM which utilizes the W-CDMA air interface and GSM infrastructures .so it is also called 3GSM HISTORY OF UMTS 1G networks (NMT, C-Nets, AMPS, TACS) are considered to be the first analog cellular systems, which started early 1980s. 2G networks (GSM, camion, DAMPS) are the first digital cellular systems launched early 1990s. 2.5G networks (GPRS, cdma2000 1x) with data rates up to about 144kbit/s. 3G networks (UMTS FDD and TDD, cdma2000 1x EVDO, cdma2000 3x, TD-SCDMA, EDGE, IMT-2000 DECT) are the latest cellular networks that have data rates 384kbit/s and more. CELLULAR TECHNOLOGY TYPES OF UMTS SYSTEM There are two types of UMTS systems: Frequency division duplex (FDD) wideband code division multiple access (FDD/WCDMA) And time division duplex (TDD) wideband code division multiple access (TDD/WCDMA). FDD/WCDMA uses two frequencies, which allows separate transmission and reception on two different frequencies. TDD/WCDMA allows for duplex transmission on the same frequency by assigning different time slots in a single frame for transmission and reception. SPECIAL FEATURES OF UMTS FOR USERS: SPEED ALWAYS ON CONNECTION VALUE AVAILABILITY SUPPORTS BANDWIDTH INTENSIVE APPLICATION GLOBAL ROAMING QUALITY OF SERVICE SECURITY FOR OPERATORS: EASY TO IMPLEMENT SPECTRALLY EFFICIENT AND FLEXIBLE VOLUME RESEARCH AND DEVELOPENT QUALITY CONTROL FORWARD LOOKING DESIGN TECHNOLOGY UMTS combines the W-CDMA, TD-CDMA, or TDSCDMA air interfaces, GSM Mobile Application Part (MAP) core, and the GSM family of speech codes. In the most popular cellular mobile telephone variant of UMTS, W-CDMA is currently used UMTS over W-CDMA uses a pair of 5 MHz channels. In contrast, the competing CDMA2000 system uses one or more arbitrary 1.25 MHz channels for each direction of communication. Uses spread spectrum technology. it assigns different codes to users as in CDMA. UMTS CORE NETWORK Packet switch domain Description The network consists of Radio interface UTRAN Circuit switch domain Packet switch domain UTRAN: umts terrestrial radio access network -Radio Network Controller (RNC), - 3G Base stations (Node Bs) - air interface (Tower) to the mobile equipment (ME) NETWORK ELEMENTS msc Mobile switching center switch Serves ME at its current location for circuit switch service gmsc Gateway msc Serves umts where it is connected to ext CS nw mgw Media gateway Performs actual switching for user data sgsn Serving gprs support node Serves ME for packet data ggsn Gateway serving gprs support node Connects packet switch nw to internet Node b 3g base station Handles radio channel,multiplexing n demultilexing of data n voice rnc Radio nw controller UMTS SPECTRUM BANDWIDTH IS 5MHZ. SPECTRUM SPECIFIED BY WARC-92 IS 1900MHZ FOR UPLINK AND 2100MHZ FOR DOWNLINK Over 120 licenses have already been awarded to operators worldwide (as of December 2004), specifying W-CDMA radio access technology that builds on GSM ADVANTAGES OVER GSM AND CDMA SPEED HIGH SPECTRAL EFFICIENCY GLOBAL ROAMING GOOD NETWORK COVERAGE BETTER QUALITY OF SERVICE APPLICATIONS OF UMTS VPN Java Bluetooth I-mode Multimedia M-commerce and e-commerce Upgradation of umts UMTS networks have been or are in the process of being upgraded with High Speed Downlink Packet Access (HSDPA), HSUPA (high speed uplink packet access) sometimes known as 3.5G which improves the speed up to 14mbps. HSDPA enables downlink transfer speeds of up to 10 Mbit/s. HSUPA improves the uplink speed up to 5.76Mbps. FUTURE ASPECT OF UMTS UMTS’ QoS mechanisms also can support Voice over Internet Protocol (VoIP), the final stage of the UMTS vision, where voice and data travel over the same packet infrastructure. That design reduces the need for, and cost of, a separate infrastructure for circuit-switched voice 3GPP Long Term Evolution project plans to move UMTS to 4G speeds of 100 Mbit/s down and 50 Mbit/s up, using a next generation air interface technology based upon OFDM. CRITICISM UMTS is criticized for its wide spectrum. Cost of license for its spectrum is very high Deployment of UMTS requires up gradation of existing GSM networks which is very costly UMTS network requires base station at every 100 meters which is not possible in urban areas