2- OWA310010 WCDMA Radio Interface and Physical Layer ISSUE 1.11

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Upon completion of this course, you will be able to:Outline radio interface protocol ArchitectureDescribe structure and functions of different physical channelsDescribe UMTS physical layer procedures

Transcript of 2- OWA310010 WCDMA Radio Interface and Physical Layer ISSUE 1.11

WCDMA Radio Interface Physical Layer

www.huawei.com

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Foreword

The physical layer offers data transport services to higher layers. 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.

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page1

Objectives

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

Outline radio interface protocol Architecture

Describe structure and functions of different physical channelsDescribe UMTS physical layer procedures

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page2

Contents1. Physical Layer Overview 2. Physical Channels

3. Physical Layer Procedure

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page3

Contents1. Physical Layer Overview 2. Physical Channels

3. Physical Layer Procedure

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page4

UTRAN Network StructureCNCore Network CS Iu-CS PS Iu-PS CS Iu-CS PS Iu-PS

RNSIur RNC

RNSRNC Iub NodeB Iub NodeB Iub NodeB

UTRANIub NodeB

Uu

UECopyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page5

Uu Interface Protocol StructureGC Nt DC

Duplication avoidanceGC C-plane signaling Nt DC U-plane information control UuS boundary

control

control

RRCcontrol control

L3radio bearer PDCP PDCP BMC RLC

L2/PDCP L2/BMC L2/RLClogical channel

RLC

RLC

RLC

RLC

RLC

RLC

RLC

MAC

L2/MACtransport channel

PHYCopyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

L1Page6

RAB, RB and RL

RAB RB UE

RNC NodeB

CN

RL

UTRAN

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page13

Contents1. Physical Layer Overview 2. Physical Channels

3. Physical Layer Procedure

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page14

Contents2. Physical Channels2.1 Physical Channel Structure and Functions

2.2 Channel Mapping

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Page15

WCDMA Radio Interface Channel Definition

Logical Channel = information container

Defined by is transferred

Transport Channel = characteristics of transmission

Described by and with data is transmitted over the radio interface

Physical Channel = specification of the information global content

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

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Page16

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

Broadcast control channelPaging control channel Dedicate control channel Common control channel

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

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Page17

Transport ChannelDedicated transport channel

Dedicated Channel

(DCH)

Broadcast channel Forward access channel (FACH)

(BCH) Common transport channel

Paging channelRandom access channel

(PCH)(RACH)

High-speed downlink shared channel (HS-DSCH)

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page20

Physical Channel

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

Frequency, Code, Phase

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page21

Downlink Physical Channel

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

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)

High-Speed Physical Downlink Shared Channel (HS-PDSCH) High-Speed Shared Control Channel (HS-SCCH)Page22

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Uplink Physical Channel

Uplink Dedicated Physical Channel

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

Uplink Common Physical Channel

Physical Random Access Channel (PRACH)

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page23

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

Paging ChannelsPICH--Paging Indicator Channel SCCPCH--Secondary Common Control Physical Channel

Random Access Channels

NodeB

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

UE

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

High Speed Downlink Share ChannelsHS-SCCH--High Speed Share Control Channel HS-PDSCH--High Speed Physical Downlink Share Channel HS-DPCCH--High Speed Dedicated Physical Control ChannelCopyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page24

Synchronization Channels (P-SCH & SSCH)

Used for cell searchTwo sub channels: P-SCH and S-SCH SCH is transmitted at the first 256 chips of every time slot

Primary synchronization code istransmitted repeatedly in each time slot

Secondary synchronization code specifies the scrambling code groups of the cellSlot #14

Slot #0

Slot #1

Primary SCH Secondary SCH

ac p ac si,0 256 chips 2560 chips

ac p ac si,1

ac pi,14

acs

One 10 ms SCH radio frame

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page25

Secondary Synchronization Channel (S-SCH)Scrambling Code Group Group 0 Group 1 Group 2 Group 3 Group 4 Group 61 Group 62 Group 63 #0 1 1 1 1 1 9 9 9 #1 1 1 2 2 2 10 11 12 #2 2 5 1 3 16 13 12 10 #3 8 16 15 1 6 10 15 15 #4 9 7 5 8 6 11 12 13 #5 10 3 5 6 11 15 9 14 slot number #6 #7 #8 15 8 10 14 16 3 12 16 6 5 2 5 15 5 12 15 13 9 9 13 14 16 11 15 #9 16 10 11 8 1 12 14 11 #10 #11 #12 #13 #14 2 7 15 7 16 5 12 14 12 10 2 16 11 15 12 4 4 6 3 7 15 12 16 11 2 14 10 11 13 16 13 16 15 12 14 14 16 11 16 10

Slot # ? P-SCH S-SCH

Slot #?

Slot #?

acp 16256 chips

acp 6

acp 11

..

Group 2 Slot 7, 8, 9

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page26

Primary Common Pilot Channel (PCPICH)

Primary CPICH

Carrying pre-defined sequence Fixed channel code: Cch, 256, 0, Fixed rate 30Kbps Scrambled by the primary scrambling code Broadcast over the entire cell A phase reference for SCH, Primary CCPCH, AICH, PICH and

downlink DPCH, Only one PCPICH per cellPre-defined symbol sequenceTslot = 2560 chips , 20 bits

Slot #0

Slot #1

Slot # i 1 radio frame: Tr = 10 ms

Slot #14

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page27

Primary Common Control Physical Channel (PCCPCH)

Carrying BCH transport channel Fixed rate, fixed OVSF code (30kbpsCch, 256, 1)

The PCCPCH is not transmitted during the first 256 chips of eachtime slot256 chips SCH T PCCPCH Data 18 bits slot = 2560 chips,20 bits

Slot #0

Slot #1

Slot #i 1 radio frame: T f = 10 ms

Slot #14

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page28

Paging Indicator Channel (PICH)

Carrying Paging Indicators (PI) Fixed rate (30kbps), SF = 256

N paging indicators {PI0, , PIN-1} in each PICH frame, N=18, 36,72, or 144288 bits for paging indicationb0 b1

12 bits (undefined)b 287 b 288 b 299

One radio frame (10 ms)

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page29

Secondary Common Control Physical Channel (SCCPCH)

Carrying FACH and PCH, SF = 256 - 4

Pilot: used for demodulation

TFCI: Transport Format Combination Indication, used for describedata format

TFCI N TFCI bits

Data

N Data bitsT slot = 2560 chips, 20*2 k bits (k=0..6)

Pilot N Pilot bits

Slot #0

Slot #1

Slot #i 1 radio frame: T f = 10 ms

Slot #14

Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

Page30

Physical Random Access Channel (PRACH)

Carrying uplink signaling and data, consist of two parts:

One or several preambles: 16 kinds of available preambles

10 or 20ms message part

Preamble4096 chips

Preamble

Preamble

Message part

10 ms (one radio frame) Message part 20 ms (two radio frames)

Preamble 4096 chips

Preamble