UMTS INTRODUCTION

UMTS INTRODUCTIONPT NEXWAVE 2012

UMTS INTRODUCTIONUMTS OverviewMultiple AccessNetwork Architecture

UMTS INTRODUCTIONUMTS OverviewMultiple AccessNetwork Architecture

UMTS OverviewCharacteristic for UMTS3Gor3rd generation mobile telecommunications, fulfilling theInternational Mobile Telecommunications-2000 (IMT 2000)specifications.For Indonesia, using 2100 MHz bandUsing CDMA for multiple accessWideband frequency bandwidth: 5 MHz, with efficient signal bandwidth: 3.84 MHzCarrier chip rate: 3.84 McpsAll cells are using same frequency bandUsing codes for separate user and channelIncreasing capacity with multiple frequenciesInter-Frequency functionality to support mobility between frequenciesInter-System functionality to support mobility between GSM and UMTSIntra-frequency Handover: softInter-frequency Handover: hardSpreading factors (SF): 4512

Spreading CodeSpread SignalDataBits (In this drawing, 1 bit = 8 Chips SF=8)Baseband Data-1+1+1-1+1-1+1-1+1-1ChipChipAir InterfaceDespreadingCDMA Principle - Chips & Bits & SymbolsUMTS Overview

WCDMA Codes:In WCDMA two separate codes are used in the spreading operation :Channelization code DL: separates physical channels of different users and common channels, defines physical channel bit rate UL: separates physical channels of one user, defines physical channel bit rateScrambling codeDL: separates cells in same carrier frequencyUL: separates usersUMTS OverviewDataBit RateChannelization CodeScrambling CodeTo be TransmitBlock Diagram:

UMTS INTRODUCTIONUMTS OverviewMultiple AccessNetwork Architecture

UMTS OverviewMultiple AccessDuplex ModesUTRA FDD (Frequency Division Duplex) Mode Paired separate frequency bands Duplex separation is 190 MHz For low data rate, wide cell area

UTRA TDD (Time Division Duplex) Mode Uplink and downlink in the same frequency band Guard period is needed. For higher data rate, small cell area

UMTS Channel (W-CDMA FDD)

Logical Channel:Control Channels (CCH)Broadcast Control Channel (BCCH)Paging Control Channel (PCCH)Common Control Channel (CCCH)Dedicated Control Channel (DCCH)Traffic Channel (TCH)Dedicated Traffic Channel (DTCH)Common Traffic Channel (CTCH)

Transport Channels:Common Transport ChannelsBroadcast Channel (BCH)Paging Channel (PCH)Forward Access Channel (FACH)High Speed Downlink Shared Channel (HS-DSCH)Random Access Channel (RACH)Dedicated Transport ChannelsDedicated Channel (DCH)Enhanced Dedicated Channel (E-DCH)UMTS OverviewUMTS Channel (W-CDMA FDD)

Physical Channel :Transport channels can be mapped to physical channels. Physical Channels are characterized by :UARFCN,Scrambling Code,Channelization code

So, in summarize:Logical Channel Transport Channel Physical ChannelMappedMapped

DownlinkUplinkUMTS Channel Mapping

UMTS INTRODUCTIONUMTS OverviewMultiple AccessNetwork Architecture

3G GSM Architecture

UTRAN (Universal Terrestrial Radio Access Network) consist of:

Node-B (equivalent to BTS in 2G)Perform functions:Air interface Transmission / ReceptionModulation / DemodulationCDMA Physical Channel codingMicro DiversityError HandingClosed loop power control

RNC (Radio Network Controller)Perform function:Radio Resource ControlAdmission ControlChannel AllocationPower Control SettingsHandover ControlMacro DiversityCipheringSegmentation / ReassemblyBroadcast SignalingOpen Loop Power Control

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