UMTS & New Technologies «Wireless data world»
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1 EPFL Section Systèmes de Communication Cours Mobile Networks UMTS & New Technologies «Wireless data world» Alexandre LEHERICEY Radio Access Engineering 21/12/2004 mailto:
2 UMTS course Introduction UMTS principles Network Architecture WCDMA Basics General Protocols Model Radio Resource Management and ATM transmission UMTS Evolution HSDPA TDD All IP UMTS Project Network Architecture and Design Rollout System Acceptance Testing Network Performances Launch 2
3 Why a third Generation AMPS TDMA GSM EFR GSM/GPRS 171 kbps AMR GSM/GPRS/EDGE 473 kbps 384 Kbps WCDMA Multiradio GSM Network EAMR 2 Mbps TDD/ All IP HSDPA 10 Mbps 2G First Steps to 3G 3G Phase 1 Networks Evolved 3G Networks 3
4 Why a third Generation Air Interface: Bottleneck of the wireless systems Seamless Roaming Global Solution Europe: GSM EDGE, WCDMA China: GSM EDGE, WCDMA Japan: WCDMA Americas:GSM EDGE IS-136 Korea: WCDMA SEAP: GSM EDGE, WCDMA 4
5 Key words: Services and... Seamless access to my services from different networks Familiar "look and feel" of my services from different terminals Enjoy a large number of diversified services My services are available wherever I am My service profile can be managed and configured by myself 5
6 ...Quality Of Service When comparing to GSM and other 2G cellular systems, 3G brings in a new aspect, QoS classification. The services offered can be divided into four different groups also called Traffic Classes. Those are: Conversational (e.g. speech and video Telephony) Streaming (e.g. listening to music and watching video) Interactive (e.g. Internet based shopping) Background (e.g. downloading mail) This division aims to take into account how delay sensitive the traffic in each class is. The Conversational Class traffic is very delay sensitive and the Background Class traffic is very insensitive for delays. 6
7 3G Specification: 3GPP 3GPP - Third Generation Partnership Project ARIB - Association of Radio Industries and Businesses CWTS - China Wireless Telecommunication Standard group ETSI - European Telecommunications Standards Institute T1 - Standards Committee T1 Telecommunications TTA - Telecommunications Technology Association TTC - Telecommunication Technology Committee GSM - Global System for Mobile Communications UMTS - Universal Mobile Telecommunications System IETF - Internet Engineering Task Force ITU-R - International Telecommunication Union - Radiocommunication ITU-T - International Telecommunication Union - Telecommunication Standardization 7
8 UMTS course Introduction UMTS principles Network Architecture WCDMA Basics General Protocols Model Radio Resource Management and ATM transmission UMTS Evolution HSDPA TDD All IP UMTS Project Network Architecture and Design Rollout System Acceptance Testing Network Performances Launch 8
9 Terminals Development Pads / Telematics Classic Terminals Data Terminals Dual mode Phones Multimedia terminals 9
10 Network Architecture USIM card GSM/WCDMA mobile GSM/WCDMA mobile WCDMA BTS RAN RNC 3G SGSN GPRS GGSN PS Core Network Interne (TCP/IP t ) Circuit Switched Core Network SRR HLR MSC WCDMA mobile WCDMA BTS RNC Media Gateway IN SCP (PSTN/ISDN) 10
11 4 RAN Interfaces Uu Iub Iu Node B RNC Iu-CS MGW MSC Iur Iu-PS Node B RNC 3G SGSN 11
12 UMTS course Introduction UMTS principles Network Architecture WCDMA Basics General Protocols Model Radio Resource Management and ATM transmission UMTS Evolution HSDPA TDD All IP UMTS Project Network Architecture and Design Rollout System Acceptance Testing Network Performances Launch 12
13 Frequency Allocation EUROPE GSM1800(DL) DECT UMTS TDD UMTS FDD (UL) MSS (UL) UMTS TDD UMTS FDD (DL) MSS (DL) USA PCS A D B EF C A D B EF C MSS (UL) MDS MSS (DL) WLL TDD (SCDMA) Ext. GSM1800? CHINA GSM1800(DL) PCS FDD (UL) * WLL FDD (UL) * WLL TDD IMT2000 (UL) PCS FDD (DL) * WLL FDD (DL) * MSS (UL) IMT 2000 TDD IMT2000 (DL) MHz MSS (DL) * Reserved, not assigned to an operator ITU/RR S5.388 MSS (UL) MSS (DL) MHz 13
14 FDD Duplex method: FDD Channel spacing: 5 MHz Carrier chip rate: 3.84 Mcps Time slot structure: 15 slots/frame Frame length: 10 ms Modulation: QPSK Detection: based on pilot symbols Intra-frequency Handover: soft Inter-frequency Handover: hard Spreading factors:
15 WCDMA principle (1/6) WCDMA Carrier 3.84MHz 5MHz 15
16 WCDMA principle (2/6) Used Modulations UE QPSK Transmitter BS OQPSK Receiver 16
17 WCDMA principle (3/6) Multiple Access - CDMA Power (P) (Spreading) Codes Time Frequency CDMA = Code Division Multiple Access 17
18 WCDMA principle (4/6)
19 WCDMA principle (5/6) Spreading Principle P User A f Data after spreading P Data Data after User B f f f Transm ission over the air Despread User A signal at the receiver f f 19
20 WCDMA principle (6/6) Codes and their Use Usage Length Channelisation code Uplink: separation of physical data /DPDCH) and control channels (DPCCH) from same terminal Downlink: Separation of downlink connections to different users within one cell chips Downlink also 512 chips Scrambling code Uplink: Separation of terminal Downlink: Separation of sectors (cells) Uplink: 10 ms=38400 chips or 66.7us=256 chips Downlink: S10 ms=38400 chips) Number of codes Number of codes under one scrambling code=spreading factor Uplink: Several millions Downlink: 512 Code family Orthogonal Variable Spreading Factor Long 10 ms code: Gold code Short code: Extended S(2) code family Spreading Yes, increases transmission bandwidth No, does not affect transmission bandwidth 20
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