001-WCDMA Radio Interface Physical Layer ISSUE 1

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    Internal

    WCDMA Radio InterfacePhysical Layer

    ISSUE 1.0

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    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.

    The physical layer is expected to perform the

    following functions in order to provide the data

    transport service, for example Modulation and

    spreading/demodulation and despreading, Inner -

    loop power control etc.

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    References

    TS 25.104 UTRA (BS) FDD Radio Transmission andReception

    TS 25.201 Physical layer-general descriptionTS 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 Acces (HSDPA) -Iub/Iur Protocol Aspects

    TR 25.858 Physical layer aspects of UTRA High SpeedDownlink Packet Access

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    Upon completion of this course, you will beable to:

    Understand radio interface protocolArchitecture

    Understand key technology of UMTSphysical layer

    Understand UMTS physical layerprocedures

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    Chapter 1 Physical Layer OverviewChapter 1 Physical Layer Overview

    Chapter 2 Physical layer key technologyChapter 2 Physical layer key technology

    Chapter 3 Physical Layer Processing ProcedureChapter 3 Physical Layer Processing Procedure

    Chapter 4 Physical Layer ProceduresChapter 4 Physical Layer Procedures

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    UTRAN Protocol Structure

    RNS

    RNC

    RNS

    RNC

    Core Network

    Node B Node B Node B Node B

    Iu Iu

    Iur

    Iub IubIub Iub

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    Radio Interface Protocol Structure

    L3

    c o n t r o

    l

    c o n t r o

    l

    c o n t r o

    l

    c o n t r o

    l

    LogicalChannels

    TransportChannels

    C-plane signaling U-plane information

    PHY

    L2/MAC

    L1

    RLC

    DCNtGC

    L2/RLC

    MAC

    RLCRLC

    RLCRLC

    RLCRLCRLC

    Duplication avoidance

    UuS boundary

    BMC L2/BMC

    control

    PDCPPDCP L2/PDCP

    DCNtGC

    RadioBearers

    RRC

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    Spreading TechnologySpreading consists of 2 steps

    Channelization operation which transforms data symbols into chips.Thus increasing the bandwidth of the signal, The number of chips per datasymbol is called the Spreading Factor SF .The operation is done bymultiplying with OVSF code.

    Scrambling operation is applied to the spreading signal .

    Data bit

    OVSFcode

    Scramblingcode

    Chips afterspreading

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    Channelization Code

    OVSF code is used as channelization code

    The channelization codes are uniquely described as C ch,SF,k , where SF is thespreading factor of the code and k is the code number, 0 k SF-1.

    SF = 1 SF = 2 SF = 4

    C ch,1,0 = (1)

    C ch,2,0 = (1,1)

    C ch,2,1 = (1,-1)

    C ch,4,0 =(1,1,1,1)

    C ch,4,1 = (1,1,-1,-1)

    C ch,4,2 = (1,-1,1,-1)

    C ch,4,3 = (1,-1,-1,1)

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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 2 24 long and 2 24 short uplink scrambling

    codes. Uplink scrambling codes are assigned by

    higher layers.

    For downlink physical channels, a total of 2 18-1 =

    262,143 scrambling codes can be generated.

    scrambling codes k = 0, 1, , 8191 are used.

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    Scramblingcodes fordownlinkphysicalchannels

    Set 0

    Set 1

    Set 511

    Primaryscrambling code 0

    Secondaryscrambling code 1

    Secondaryscrambling code 15

    Primaryscrambling code511 16

    Secondaryscrambling code

    511 16 15

    8192 scramblingcodes

    512 sets

    Primary Scrambling Code

    A primary scrambling code and 15 secondary scrambling codes are

    included in a set.

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    Primary Scrambling Code Group

    Primaryscramblingcodes fordownlinkphysicalchannels

    Group 0

    Primaryscrambling code 0

    Primaryscrambling code8*63

    Primaryscrambling code

    63*8 7512 primary

    scrambling codes

    Group 1

    Group 63

    Primaryscrambling code 1

    Primary scramblingcode 15

    64 primary scramblingcode groups

    Each group consists of 8primary scrambling codes

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    Chapter 1 Physical Layer OverviewChapter 1 Physical Layer Overview

    Chapter 2 Physical layer key technologyChapter 2 Physical layer key technology

    Charter 3 Physical layer processing procedureCharter 3 Physical layer processing procedure

    Chapter 4 Physical Layer ProceduresChapter 4 Physical Layer Procedures

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    Chapter 2 Physical layer key technologyChapter 2 Physical layer key technology

    Section 1 Physical ChannelSection 1 Physical Channel Structure and FunctionsStructure and Functions

    Section 2 Channel MappingSection 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 threechannels: Physical channel, transport channel and logical channel.

    Logical channel: Carrying user services directly. According to the typesof the carried services, it is divided into two types: Control channel andservice channel.

    Transport channel: It is the interface of radio interface layer 2 and

    physical layer, and is the service provided for MAC layer by thephysical layer. According to whether the information transported isdedicated information for a user or common information for all users, itis 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 ofchannel which uses dedicated carrier frequency, code (spreading codeand scramble) and carrier phase (I or Q) can be regarded as adedicated channel.

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    Control channel

    Traffic channel

    Dedicated traffic channel DTCH

    Common traffic channel CTCH

    Broadcast control channel BCCH

    Paging control channel PCCH

    Dedicate control channel DCCH

    Common control channel (CCCH

    logical channel

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    Dedicated Channel (DCH)

    -The Dedicated Channel (DCH) is anuplink or downlink channel.

    Broadcast channel (BCH)

    Forward access channel (FACH)

    Paging channel (PCH)

    Random access channel (RACH)

    High-speed downlink shared channel(HS-DSCH)

    Common transportchannel

    Dedicated transportchannel

    Transport channel

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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 orspreading code) can distinguish the channels.

    Most channels consist of radio frames and time slots, andeach radio frame cons