WCDMA Radio Interface Physical Layer (With Comment) ISSUE 1.0

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WCDMA Radio Interface Physical Layer (With Comment) ISSUE 1.0

Transcript of WCDMA Radio Interface Physical Layer (With Comment) ISSUE 1.0

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WCDMA Radio Interface Physical Layerwww.huawei.com

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Chapter 1 Physical Layer Overview Chapter 2 Physical Layer Key Technology Chapter 3 Physical Layer Procedures

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Page 1

UTRAN Protocol StructureCore Network

IuRNS RNS

Iu

IurRNC Iub NodeB Iub NodeB Iub NodeB RNC Iub NodeB

UTRAN User EquipmentHUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2

Radio Interface Protocol StructureGC Nt DC Duplication avoidance

GCC-plane signaling

Nt

DC U-plane informationUuS boundary

RRC control control

control

L3 Radio Bearers PDCP PDCP L2/PDCP

control control

BMC

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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Spreading Technology Spreading consists of 2 steps

Channelization operation, which transforms data symbols into chips. Thus increasing the bandwidth of the signal, The number of chips per data symbol is called the Spreading FactorSF.The operation is done by multiplying with OVSF code Scrambling operation is applied to the spreading signal

Data bit

Chips after spreading

OVSF code

Scrambling code

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Channelization Code 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-1Cch,4,0 =(1,1,1,1) Cch,2,0 = (1,1) Cch,4,1 = (1,1,-1,-1) Cch,1,0 = (1) Cch,4,2 = (1,-1,1,-1) Cch,2,1 = (1,-1) Cch,4,3 = (1,-1,-1,1) SF = 1 SF = 2 SF = 4All rights reserved Page 8

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Scrambling Code Scrambling code: GOLD sequence Scrambling code period: 10ms ,or 38400 chips There are 224 long and 224 short uplink scrambling codes For downlink physical channels, a total of 218-1 = 262143 scrambling

codes can be generated. scrambling codes k = 0, 1, , 8191 are used

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Primary Scrambling CodePrimary scrambling code 0Set 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.HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 10

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 7 Primary scrambling code 63 8

Group 63

Primary scrambling code 6387 512 primary scrambling codes 64 primary scrambling code groups Each group consists of 8 primary scrambling codes

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Chapter 1 Physical Layer Overview Chapter 2 Physical Layer Key Technology Chapter 3 Physical Layer Procedures

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Chapter 2 Physical Layer Key Technology Section 1 Physical Channel Structure and Functions Section 2 Channel Mapping

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WCDMA radio interface has three kinds of channels In terms of protocol layer, the WCDMA radio interface has three channels:

Physical channel, transport channel and logical channel. Logical channel: Carrying user services directly. According to the types of the

carried services, it is divided into two types: Control channel and traffic channel Transport channel: It is the interface of radio interface layer 2 and physical

layer, and is the service provided for MAC layer by the physical layer. According to whether the information transported is dedicated information for a user or common information for all users, it is divided into dedicated channel and common channel Physical channel: It is the ultimate embodiment of all kinds of information when

they are transmitted on radio interfaces. Each kind of channel which uses dedicated carrier frequency, code (spreading code and scrambling code) and carrier phase (I or Q) can be regarded as a dedicated channel

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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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Transport ChannelDedicated Channel (DCH)

DCH is an uplink or downlink channel

Dedicated transport channel

Broadcast channel Forward access channel

(BCH) (FACH)

Paging channelRandom access channel

(PCH)(RACH)

Common transport channel

High-speed downlink shared channel (HSDSCH)

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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 DL

Physical Channel

Frequency, Code, Phase

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Downlink Physical Channel Downlink Dedicated Physical Channel

(Downlink DPCH) Downlink Common Physical Channel

Common Control Physical Channel (CCPCH) Synchronization Channel Paging Indicator Channel Acquisition Indicator Channel Common Pilot Channel (SCH) (PICH) (AICH) (CPICH)

Downlink Physical Channel

High-Speed Physical Downlink Shared Channel (HS-PDSCH) High-Speed Shared Control Channel (HS-SCCH)HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 19

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 Control Channel (HS-DPCCH)

Uplink Physical Channel

Uplink Common Physical Channel

Physical Random Access Channel (PRACH)

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Function of physical channelCell broadcast channelsP-CPICH-Primary Common Pilot Channel S-CPICH-Secondary Common Pilot Channel P-CCPCH-Primary Common Control Physical Channel SCH- Synchronisation Channel

Paging channelsS-CCPCH-Secondary Common Control Physical Channel PICH-Paging Indicator Channel

Random access channels Node BPRACH-Physical Random Access Channel AICH-Acquisition Indicator Channel

UE

Dedicated channelsDPDCH-Dedicated Physical Data Channel DPCCH-Dedicated Physical Control Channel

High speed downlink share channelsHS-SCCH-High Speed Share Control ChannelHS-PDSCH-High Speed Physical Downlink Share Channel HS-DPCCH-High Speed Dedicated Physical Control Channel

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Primary Synchronization Channel (P-SCH) Used for cell search Two sub channels: P-SCH and S-SCH SSC specifies the scrambling code

groups of the cell SSC is chosen from a set of 16 SCH is transmitted at the first 256 chips different codes of length 256, and of every time slot there are altogether 64 SSC PSC is transmitted repeatedly in each sequences correspond to 64 primary time slot scrambling code groupsSlot #0 Slot #1 Slot #14

Primary SCH

ac p ac si,0256 chips 2560 chips

ac p ac si,1

ac p acsi,14

Secondary SCH

One 10 ms SCH radio frame

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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 # ?

Slot #?

Slot #?

P-SCHS-SCH

acp 16256 chips 2560 chips

acp 6

acp 11

..

Group 2 Slot 7, 8, 9Page 23

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Common Pilot Channel (CPICH) Common Pilot Channel (CPICH) Carries pre-defined sequence Fixed rate 30Ksps SF=256 Primary CPICH (P-CPICH)

Uses the fixed channel code -- Cch,256,0 Scrambled by the primary scrambling code Only one CPICH per cell Broadcast over the entire cell The P-CPICH is a phase reference for SCH, Primary CCPCH, AICH, PICH. By default, it is also a phase reference for downlink DPCHPre-defined symbol sequenceTslot = 2560 chips , 20 bits

Slot #0

Slot #1

Slot # i

Slot #14

1 radio frame: Tr = 10 ms

HU