01 WCDMA Radio Interface Physical Layer

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Transcript of 01 WCDMA Radio Interface Physical Layer

WCDMA Radio Interface Physical Layer

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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

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Forewordl l

The physical layer offers data transport services to higher layers. The access to these services is through the use of transport channels via the MAC sub-layer.

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The physical layer is expected to perform the following functions in order to provide the data transport service, for example: spreading, modulation and demodulation, despreading, Inner-loop power control and etc.

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Page1

Objectivesl

Upon completion of this course, you will be able to:p

Outline radio interface protocol Architecture Describe key technology of UMTS physical layer Describe UMTS physical layer procedures

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p

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Page2

Contents1. Physical Layer Overview 2. Physical Layer Key Technology 3. Physical Layer Procedure

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Page3

Contents1. Physical Layer Overview 2. Physical Layer Key Technology 3. Physical Layer Procedure

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Page4

UTRAN Protocol StructureCore Network Iu RNS Iur RNC Iub NodeB Iub NodeB Iub NodeB RNC Iub NodeB RNS Iu

UTRAN User EquipmentCopyright 2006 Huawei Technologies Co., Ltd. All rights reserved. PDF created with pdfFactory Pro trial version www.pdffactory.com Page5

Radio Interface Protocol StructureGC Nt DC Duplication avoidance GC C-plane signaling Nt DC U-plane information control UuS boundary

RRC control control control control

L3 Radio Bearers PDCP PDCP BMC L2/PDCP L2/BMC

RLC

RLC

RLC

RLC RLC RLC

RLC RLC

L2/RLC

Logical Channels MAC L2/MAC Transport Channels L1

PHY

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Page6

Spreading Technologyl

Spreading consists of 2 stepsp

Channelization operation, which transforms data symbols into chips Scrambling operation is applied to the spreading signal

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Data bit

Chips after spreading

OVSF code

Scrambling code

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Page13

Spreading Technologyl l

OVSF code is used as channelization code The channelization codes are uniquely described as Cch,SF,k, where SF is the spreading factor of the code and k is the code number, 0 k SF-1.C ch,4,0 =(1,1,1,1) C ch,2,0 = (1,1) C ch,4,1 = (1,1,-1,-1) C ch,1,0 = (1) C ch,4,2 = (1,-1,1,-1) C ch,2,1 = (1,-1) C ch,4,3 = (1,-1,-1,1) SF = 1 SF = 2 SF = 4Page14

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Scrambling Codel l l

Scrambling code: GOLD sequence. Scrambling code period: 10ms ,or 38400 chips. The code used for scrambling of the uplink DPCCH/DPDCH may be of either long or short type, There are 224 long and 224 short uplink scrambling codes. Uplink scrambling codes are assigned by higher layers. For downlink physical channels, a total of 218-1 = 262,143 scrambling codes can be generated. scrambling codes k = 0, 1, , 8191 are used.

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Page15

Primary Scrambling CodePrimary scrambling code 0 Set 0 Scrambling codes for downlink physical channels Secondary scrambling code 1 Secondary scrambling code 15 Primary scrambling code 51116

Set 1

Set 511

8192 scrambling codes

512 sets

Secondary scrambling code 5111615

A primary scrambling code and 15 secondary scrambling codes are included in a set.Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved. PDF created with pdfFactory Pro trial version www.pdffactory.com Page16

Primary Scrambling Code GroupPrimary scrambling code 0 Group 0 Primary scrambling codes for downlink physical channels Group 1 Primary scrambling code 1 Primary scrambling code 15 Primary scrambling code 8*63

Group 63

Primary scrambling code 63*87

512 primary scrambling codes

64 primary scrambling code groups

Each group consists of 8 primary scrambling codesPage17

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Contents1. Physical Layer Overview 2. Physical Layer Key Technology 3. Physical Layer Procedure

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Page18

Contents2. Physical Layer Key Technology2.1 Physical Channel Structure and Functions 2.2 Channel Mapping

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Page19

WCDMA Radio Interface Channel Definitionl

Logical Channel = information containerp

Defined by is transferred

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Transport Channel = characteristics of transmissionp

Described by and with data is transmitted over the radio interface

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Physical Channel = specification of the information global contentp

providing the real transmission resource, maybe a frequency , a specific set of codes and phase

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Page20

Logical ChannelDedicated traffic channel Common traffic channel (DTCH) (CTCH) Traffic channel

Broadcast control channel Paging control channel Dedicate control channel Common control channel

(BCCH) (PCCH) (DCCH) (CCCH) Control channel

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Page21

Transport ChannelDedicated Channel (DCH) Dedicated transport channel

-DCH is an uplink or downlink channel

Broadcast channel Forward access channel Paging channel Random access channel

(BCH) (FACH) (PCH) (RACH) Common transport channel

High-speed downlink shared channel (HS-DSCH)

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Page23

Physical Channell

A physical channel is defined by a specific carrier frequency, code (scrambling code, spreading code) and relative phase. In UMTS system, the different code (scrambling code or spreading code) can distinguish the channels. Most channels consist of radio frames and time slots, and each radio frame consists of 15 time slots. Two types of physical channel: UL and DLPhysical Channel

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Frequency, Code, Phase

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Page24

Downlink Physical Channell

Downlink Dedicated Physical Channel (Downlink DPCH) Downlink Common Physical Channelp

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Primary Common Control Physical Channel (P-CCPCH) Secondary Common Control Physical Channel (S-CCPCH) Synchronization Channel Paging Indicator Channel Acquisition Indicator Channel Common Pilot Channel (SCH) (PICH) (AICH) (CPICH) Downlink Physical Channel

p

p p p p p

High-Speed Physical Downlink Shared Channel (HS-PDSCH) High-Speed Shared Control Channel (HS-SCCH)Page25

p

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Uplink Physical Channell

Uplink Dedicated Physical Channelp

Uplink Dedicated Physical Data Channel (Uplink DPDCH) Uplink Dedicated Physical Control Channel (Uplink DPCCH) High-Speed Dedicated Physical Channel (HS-DPCCH)

p

p

Uplink Physical Channel

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Uplink Common Physical Channelp

Physical Random Access Channel (PRACH)

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Page26

Function of Physical ChannelCell Broadcast ChannelsP-CPICH-Primary Common Pilot Channel P-CPICH-Primary Common Pilot Channel P-CCPCH-Primary Common Control Physical Channel P-CCPCH-Primary Common Control Physical Channel SCH- Synchronisation Channel SCH- Synchronisation Channel

Paging ChannelsS-CCPCH-Secondary Common Control Physical Channel S-CCPCH-Secondary Common Control Physical Channel PICH-Paging Indicator Channel PICH-Paging Indicator Channel

Random Access Channels

Node B

PRACH-Physical Random Access Channel PRACH-Physical Random Access Channel AICH-Acquisition Indicator Channel AICH-Acquisition Indicator Channel

UE

Dedicated ChannelsDPDCH-Dedicated Physical Data Channel DPDCH-Dedicated Physical Data Channel DPCCH-Dedicated Physical Control Channel DPCCH-Dedicated Physica