02-WCDMA Radio Interface Physical Layer

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WCDMA Radio Interface Physical LayerISSUE 1.0www.huawei.com

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The physical layer offers data transport services to higher layers (MAC sub-layer) The access to these services is through the use of transport channels via the MAC sub-layer The physical layer is expected to perform the following functions in order to provide the data transport service, for example modulation/demodulation and spreading/despreading, Inner - loop power control

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References TS 25.104 UTRA (BS) FDD Radio Transmission and

Reception TS 25.201 Physical layer-general description TS 25.211 Physical channels and mapping of

transport channels onto physical channels (FDD) TS 25.212 Multiplexing and channel coding (FDD) TS 25.213 Spreading and modulation (FDD) TS 25.214 Physical layer procedures (FDD) TS 25.308 UTRA High Speed Downlink Packet Access

(HSDPA); Overall description; Stage 2 TR 25.877 High Speed Downlink Packet Access (HSDPA) -

Iub/Iur Protocol Aspects TR 25.858 Physical layer aspects of UTRA High Speed

Downlink Packet Access

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

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

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

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

UTRAN User EquipmentHUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 6

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

RRC

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

control

control

control control

RLC

RLC

RLC

RLC RLC RLC

RLC

RLC

L2/RLC

Logical Channels MAC L2/MAC Transport Channels L1

PHY

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

RRC

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

control

control

control control

RLC

RLC

RLC

RLC RLC RLC

RLC

RLC

L2/RLC

Logical Channels MAC L2/MAC Transport Channels L1

PHY

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

RRC

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

control

control

control control

RLC

RLC

RLC

RLC RLC RLC

RLC

RLC

L2/RLC

Logical Channels MAC L2/MAC Transport Channels L1

PHY

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

RRC

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

control

control

control control

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 Factor SF .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 , where SF is the ,k

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 12

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Scrambling Code 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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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 51116 15

A primary scrambling code and 15 secondary scrambling codes are included in a set.HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 14

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 638 7 512 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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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 Paging channel Random access channel

(BCH) (FACH) (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 (SCH) Paging Indicator Channel Acquisition Indicator Channel Common Pilot Channel (PICH) (AICH) (CPICH)

Downlink Physical Channel

H