Universal Mobile Telecommunication System (UMTS) Anthony Benincasa TCN6275 Mobile Computing Dr. Pissinou

3G Overview Provide service of telephony, paging, messaging (SMS), internet/broadband, multimedia services International Telecommunication Union (ITU) started the design of 3G European Telecommunications Standards Institute (ETSI) responsible for defining UMTS standards, December 1999

UMTS Specifications Based on GSM standards Transfer rates: 144 kbps – Satellite and rural outdoor 384 kbps – Urban outdoor 2048 kbps – Indoor and low range outdoor Expect only up to 384 Kbit/s Uses a pair of 5 MHz channels Frequency bands: Uplink: 1885-2025 MHz Downlink: 2110-2200 MHz

UMTS Specifications (2) UMTS provides different types of Quality of Service (QoS) UMTS accommodates 4 types of traffic: Conversational class – voice, video telephony Streaming class – multimedia, VoD, webcast Interactive class – web browsing, network gaming, db access Background class – email, SMS, file downloading

UMTS Specifications (3) UMTS supports: Internet access – messaging, video/music download, VoIP Intranet/extranet access – email, mobile sales, corporate database Customized information/entertainment – mobile messaging, gaming Multimedia messaging – SMS extensions (images, video, music), document transfer Location-based services – yellow pages, mobile commerce

UMTS Architecture Based on GSM still using MSC, VLR, HLR Asynchronous Transfer Mode (ATM) is the data transmission method used General Packet Radio System (GPRS) facilitates from GSM to 3G UMTS networks, enabling packet switching and allowing direct access to external packet data networks (internet) GPRS optimizes the core network for the transition to higher data rates

UMTS Architecture (2) GSM/GPRS networks use Time Division Multiple Access (TDMA) and Frequency Division Multiple Access (FDMA) air interface transmission UMTS networks use Wide-band Code Division Multiple Access (WCDMA), 2 modes of operation (Frequency Division Duplex (FDD) and Time Division Duplex (TDD)) Requires new radio access network (RAN) called UMTS Terrestrial RAN (UTRAN) UTRAN introduces 2 new network elements: Radio Network Controller (RNC) equivalent to BSC Node B equivalent to BTS (extends service to multiple cells)

UMTS Architecture (3)

Radio Network Controller RNC provides centralized control of node B elements Interfaces are ATM-based Radio Resource Management is distributed to the RNC (GSM RRM is performed in the core network) Other RNC functions: Connection to User Equipment (UE) Congestion control Handover control Broadcast signaling Ciphering Channel allocation

Node B Provide service to one or more cells Can be physically located within existing GSM BTS Uses WCDMA to connect to UE Support both FDD and TDD modes ATM switching between Node B and RNC Monitoring quality & strength of connection and calculates frame error rates Other functions include: Air transmission and reception CDMA physical channel coding Modulation and demodulation Closed loop power control

User Equipment UMTS uses USIM which identifies the subscriber to the core network USIM functions: Supports multiple user profiles Security User authentication UE is attached to both packet-switched (data) and circuit-switched (voice) domains and can concurrently use both services

Conclusion UMTS is 3rd Generation Provides multiple functions such as broadband data transfer and voice Uses RNC and Node B instead of BSC and BTS Who uses UMTS? AT&T Sprint Nextel T-Mobile USA Verizon Wireless

References http://www.telecomspace.com/3g- umts.html http://www.umtsworld.com/technology/ov erview.htm http://docstore.mik.ua/univercd/cc/td/doc/ product/wireless/moblwrls/cmx/mmg_sg/c mxgsm.htm#1057908