OWA200003 WCDMA Radio Interface Physical Layer

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Transcript of OWA200003 WCDMA Radio Interface Physical Layer

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    Internal

    WCDMA Radio Interface

    Physical Layer

    ISSUE 1.0

    CHAPTER 1

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    The physical layer offers data transport

    services to higher layers.

    In order to provide the data transport service,

    the physical layer is expected to perform the

    following functions

    Modulation and demodulation

    Spreading and despreading

    Inner - loop power control

    etc.

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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, you will be

    able to:

    Understand radio interface protocol

    Architecture

    Understand key technology of UMTS

    physical layer

    Understand UMTS physical layer

    procedures

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    Chapter 1 Physical Layer Overview

    Chapter 2 Physical layer key technology

    Charter 3 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

    control

    control

    control

    control

    Logical

    Channels

    TransportChannels

    C-plane signaling U-plane information

    PHY

    L2/MAC

    L1

    RLC L2/RLC

    MAC

    RLCRLC

    RLCRLC

    RLCRLC

    RLC

    BMC L2/BMC

    control

    PDCPPDCP L2/PDCP

    RadioBearers

    RRC

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    Spreading Technology

    Spreading consists of 2 steps Channelization operationwhich 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

    Scrambling

    code

    Chips after

    spreading

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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-1.

    SF = 1 SF = 2 SF = 4

    Cch,1,0 = (1)

    Cch,2,0 = (1,1)

    Cch,2,1 = (1,-1)

    Cch,4,0 =(1,1,1,1)

    Cch,4,1 = (1,1,-1,-1)

    Cch,4,2 = (1,-1,1,-1)

    Cch,4,3 = (1,-1,-1,1)

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    Scrambling Code

    Scrambling codeGOLD sequence.

    Scrambling code period10ms, 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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    Scrambling

    codes for

    downlink

    physical

    channels

    Set 0

    Set 1

    Set 511

    Primary

    scrambling code 0

    Secondaryscrambling code 1

    Secondary

    scrambling code 15

    Primaryscrambling code

    51116

    Secondaryscrambling code

    51116158192 scrambling

    codes512 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 fordownlink

    physicalchannels

    Group 0

    Primaryscrambling code 0

    Primaryscrambling code

    8*63

    Primaryscrambling code

    63*87512 primary

    scrambling codes

    Group 1

    Group 63

    Primaryscrambling code 1

    Primary scrambling

    code 7

    64 primary scramblingcode groups

    Each group consists of 8primary scrambling codes

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    Chapter 1 Physical Layer Overview

    Chapter 2 Physical layer key technology

    Charter 3 Physical Layer Procedures

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    Chapter 2 Physical layer key technology

    Section 1 Physical ChannelStructure 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 typesof channel: 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 service 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 ofchannel which uses dedicated carrier frequency, code (spreading code

    and scramble) and carrier phase (I or Q) can be regarded as a physical

    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 an

    uplink 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 transport

    channel

    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 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 (PICH)

    Acquisition Indicator Channel (AICH)

    Common Pilot Channel (CPICH)High-Speed Physical Downlink Shared

    Channel (