1- WCDMA RAN Fundamental

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    Internal

    WCDMA RAN

    Fundamental

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

    Outline the advantage of CDMA technology

    Outline the fundamentals of UTRAN

    Outline the key technologies of UTRAN

    Outline radio interface protocol Architecture

    Describe key technology of UMTS physical

    layer

    Describe UMTS physical layer procedures

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    Chapter 1 CDMA Fundamental

    Chapter 2 WCDMA Key Technologies

    Chapter 3 Physical Layer Overview

    Chapter 4 WCDMA Key Technology

    Chapter 5 Physical Layer Procedures

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    Multiple Access Technology

    power

    FDMA

    power

    TDMA

    power

    CDMA

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    Characteristics of CDMA System

    High Spectral Efficiency

    Frequency multiplex coefficient is 1.

    soft capacity

    Quality

    Coverage

    Interference

    Self-interference system

    A UE transmission power is interference for another UE.

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    Correlation

    Correlation is a measure of similarity of between any two arbitrary signals.

    EXAMPLE:

    -1 1 -1 1

    1 1 1 1-1 1 -1 1

    Zero correlation

    Orthogonal signals

    -1 1 -1 1

    -1 1 -1 1

    1 1 1 1

    1 correlation

    Identical signals

    +1

    0

    -1

    +10

    -1

    +1

    0

    -1

    +1

    0

    -1

    (a)

    (b)

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    Spreading

    UE1: 1 1 1

    UE2: 1 1

    c1: 1111 1111

    c2: 1111 1111

    UE1c1 1111 1111UE2c2 1111 1111

    UE1c1 UE2c2 0 2 02 0 2 0 2

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    Dispreading

    UE1c1 UE2c2: 0 2 0 2 0 2 0 2

    UE1 Dispreading by c1: 11 11 11 11

    Dispreading result: 0 2 0 2 0 2 0 2

    Integral judgment: 4 (means1) 4 (means1)

    UE2 Dispreading by c2: 11 11 11 11

    Dispreading result: 0 2 0 2 0 2 0 2

    Integral judgment: 4 (means1) 4 (means1)

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    Spectrum Analysis of Spreading & Dispreading

    Spreading code

    Spreading code

    Signal

    Combination

    Narrowband signal

    f

    P(f)

    Broadband signal

    P(f)

    f

    Noise

    P(f)

    f

    Noise+Broadband signal

    P(f)

    f

    Recovered signal

    P(f)

    f

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    Chapter 1 CDMA Fundamental

    Chapter 2 WCDMA Key Technologies

    Chapter 3 Physical Layer Overview

    Chapter 4 WCDMA Key Technology

    Chapter 5 Physical Layer Procedures

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    WCDMA Source Coding

    AMR (Adaptive Multi-Rate) voice coding

    Multi-rate:

    8 kinds of coding rates

    Benefit multi-mode terminal design

    Adaptation: when cell load increases, the system will decrease

    speech rate of part of subscribers automatically so as to support

    more subscribers.

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    WCDMA Channel Coding

    Purpose:

    Enhance the correlation among symbols so as to recover the signal

    when interference occurs.

    Types

    Speech service: Convolution code1/21/3

    Data service: Turbo code

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    Interleaving is used for continuous bit error correction

    WCDMA Interleaving

    1 2 3 4 5 6 7 8 ... ... 452 453 454

    8

    16

    .

    .

    .

    456

    2

    10

    .

    .

    .

    450

    6

    14

    .

    .

    .

    454

    1

    9

    .

    .

    .

    449

    4

    12

    .

    .

    .

    452

    7

    15

    .

    .

    .

    455

    3

    11

    .

    .

    .

    451

    5

    13

    .

    .

    .

    453

    .... ....

    B0 B1 B2 B3 B4 B5 B6 B7

    {A4,B0} {A5,B1} {A6,B2} {A7,B3} {B4,C0} {B5,C1} {B6,C2} {B7,C3}

    First interleaving

    Second interleaving

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    Terms

    Bit, Symbol, Chip

    Bit : data after source coding

    Symbol: data after channel coding and interleaving

    Chip: data after spreading

    Process Gain: 10log (cps/bps); for different service, the Gain is different

    Process Gain is smaller, UE need more power for this service

    Process Gain is smaller, the coverage of the service is smaller

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    WCDMA Spreading Code: OVSFWalsh

    OVSF: Orthogonal Variable Spreading Factor, generated by Walsh matrix

    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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    Purpose of OVSF

    For uplink, OVSF is used to separate different services of one connection

    For downlink, OVSF is used to separate different connections

    Typical service Data rate Downlink SF Uplink SF

    AMR 12.2+3.4

    128 64

    Modem28.8k 28.8+3.4

    64 32

    12.2kAMR & 64k packet data 12.2+64+3.4 32 16

    12.2kAMR & 144k packet data 12.2+144+3.4 16 8

    12.2kAMR & 384k packet data 12.2+384+3.4 8 4

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    Scrambling

    codes for

    downlink

    physical

    channels

    Set 0

    Set 1

    Set 511

    Primaryscrambling code 0

    Secondaryscrambling code 1

    Secondaryscrambling 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

    Primary

    scrambling

    codes for

    downlink

    physicalchannels

    Group 0

    Primary

    scrambling code 0

    Primaryscrambling code

    8*63

    Primaryscrambling code

    63*87512 primary

    scrambling codes

    Group 1

    Group 63

    Primaryscrambling code 1

    Primary scrambling

    code 15

    64 primary scrambling

    code groups

    Each group consists of 8

    primary scrambling codes

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    WCDMA Modulation

    Different modulation methods corresponding to different transmitting

    abilities in air interface

    R99/R4: adopt QPSK

    DL max data rate is 2.7Mbps

    HSDPA: adopt 16QAM

    DL max data rate is 14.4Mbps

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    Multi-path Environment

    Time

    Received

    signal

    Transmitted

    signal

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    Fading

    Distance(m)

    Received Power(dBm)

    10 20 30

    -20

    -40

    -60

    Slow fading

    Fast fading

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    Introduction to Diversity Technique

    Diversity technique is used to obtain uncorrelated signals for combining

    Reduce the effects of fading

    Improve the reliability of communication

    Increase the coverage and capacity

    Diversity methods

    Time diversity

    Frequency diversity

    Space diversity

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    Principle of RAKE Receiver

    Receive set

    Correlator 1

    Correlator 2

    Correlator 3

    Searcher correlator Calculate the

    time delay and

    signal strength

    CombinerThe

    combined

    signal

    tt

    s(t) s(t)

    RAKE receiver help to overcome on the multi-path fading and enhance the receive

    performance of the system

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    WCDMA Fast Power Control

    Without power control With power control

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    Chapter 1 CDMA Fundamental

    Chapter 2 WCDMA Key Technologies

    Chapter 3 Physical Layer Overview

    Chapter 4 WCDMA Key Technology

    Chapter 5 Physical Layer Procedures

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    UTRAN Protocol Structure

    RNS

    RNC

    RNS

    RNC

    Core Network

    NodeB NodeB NodeB NodeB

    Iu Iu

    Iur

    Iub IubIub Iub

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    Radio Interface Protocol Structure

    L3

    co

    ntrol

    control

    control

    co

    ntrol

    Logical

    Channels

    Transport

    Channels

    C-plane signaling U-plane information

    PHY

    L2/MAC

    L1

    RLC

    DCNtGC

    L2/RLC

    MAC

    RLCRLC

    RLCRLC

    RLC

    RLCRLC

    Duplication avoidance

    UuS boundary

    BMC L2/BMC

    control

    PDCPPDCP L2/PDCP

    DCNtGC

    Radio

    Bearers

    RRC

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    Chapter 1 CDMA Fundamental

    Chapter 2 WCDMA Key Technologies

    Chapter 3 Physical Layer Overview

    Chapter 4 WCDMA Key Technology

    Chapter 5 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

    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

    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 ofinformation when they are transmitted on radio interfaces. Each kind of

    channel which uses dedicated carrier frequency, code (spreading code

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

    dedicated 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)

    -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 transport

    channel

    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 SharedChannel (HS-PDSCH)

    High-Speed Shared Control Channel(HS-SCCH)

    Downlink

    Physical Channel

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    Uplink Physical Channel

    Uplink Dedicated Physical Channel

    Uplink Dedicated Physical DataChannel (Uplink DPDCH)

    Uplink Dedicated Physical ControlChannel (Uplink DPCCH)

    High-Speed Dedicated Physical Channel(HS-DPCCH)

    Uplink Common Physical Channel

    Physical Random Access Channel

    (PRACH)

    Uplink Physical

    Channel

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    Function of physical channel

    Node B UE

    P-CCPCH-Primary Common Control Physical Channel

    SCH- Synchronisation Channel

    P-CPICH-Primary Common Pilot Channel

    S-CPICH-Secondary Common Pilot Channel

    Cel l broadcast channels

    DPDCH-Dedicated Physical Data Channel

    DPCCH-Dedicated Physical Control Channel

    Dedicated ch annels

    Paging channels

    PICH-Paging Indicator Channel

    S-CCPCH-Secondary Common Control Physical Channel

    PRACH-Physical Random Access Channel

    AICH-Acquisition Indicator Channel

    Random access channels

    HS-DPCCH-High Speed Dedicated Physical Control Channel

    HS-SCCH-High Speed Share Control Channel

    HS-PDSCH-High Speed Physical Downlink Share Channel

    High speed downl ink share channels

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    Primary Synchronization Channel (P-SCH) Used for cell search

    Two sub channels: P-SCH and S-SCH.

    SCH is transmitted at the first 256 chipsof every time slot.

    PSC is transmitted repeatedly in eachtime slot.

    SSC specifies the scrambling code

    groups of the cell.

    SSC is chosen from a set of 16different codes of length 256, thereare altogether 64 primary scramblingcode groups.

    Primary

    SCH

    Secondary

    SCH

    Slot #0 Slot #1 Slot #14

    acsi,0

    pac pac pac

    acsi,1 ac

    s

    i,14

    256 chips

    2560 chips

    One 10 ms SCH radio frame

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    slot numberScrambling

    Code Group #0 #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14Group 0 1 1 2 8 9 10 15 8 10 16 2 7 15 7 16

    Group 1 1 1 5 16 7 3 14 16 3 10 5 12 14 12 10

    Group 2 1 2 1 15 5 5 12 16 6 11 2 16 11 15 12

    Group 3 1 2 3 1 8 6 5 2 5 8 4 4 6 3 7

    Group 4 1 2 16 6 6 11 15 5 12 1 15 12 16 11 2

    Group 61 9 10 13 10 11 15 15 9 16 12 14 13 16 14 11

    Group 62 9 11 12 15 12 9 13 13 11 14 10 16 15 14 16

    Group 63 9 12 10 15 13 14 9 14 15 11 11 13 12 16 10

    Secondary Synchronization Channel (S-SCH)

    ..

    2560 chips

    acp

    Slot # ?

    P-SCHacp

    Slot #?

    16 6S-SCHacp

    Slot #?

    11 Group 2Slot 7, 8, 9

    256 chips

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    Common Pilot Channel(CPICH)

    Common Pilot Channel (CPICH)

    Carries pre-defined sequence.

    Fixed rate 30KbpsSF=256

    Primary 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 DPCH.

    Pre-defined symbol sequence

    Slot #0 Slot #1 Slot #i Slot #14

    Tslot= 2560 chips , 20 bits

    1 radio frame: Tr= 10 ms

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    Primary Common Control Physical Channel (PCCPCH)

    Fixed rate, fixed OVSF code30kbpsCch,256,1

    Carry BCH transport channel

    The PCCPCH is not transmitted during the first 256 chips of each time slot.

    Only data part

    STTD transmit diversity may be used

    PCCPCH Data

    18 bits

    Slot #0

    1 radio frame: Tf

    = 10 ms

    Slot #1 Slot #i

    256 chips

    Slot #14

    Tslot

    = 2560 chips,20 bits

    SCH

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    Paging Indicator Channel (PICH)

    PICH is a fixed-rate (SF=256) physical channel used to carry the Paging Indicators (PI).

    Frame structure of PICH: one frame of length 10ms consists of 300 bits of which 288 bitsare used to carry paging indicators and the remaining 12 bits are not defined.

    N paging indicators {PI0, , PIN-1} in each PICH frame, N=18, 36, 72, or 144.

    If a paging indicator in a certain frame is set to 1, it indicates that UEs associated withthis paging indicator should read the corresponding frame of the associated S-CCPCH.

    One radio frame (10 ms)

    b1b0

    288 bits for paging indication 12 bits (undefined)

    b287 b288 b299

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    Secondary Common Control Physical Channel (SCCPCH)

    Carry FACH and PCH.

    Two kinds of SCCPCH: with or without

    TFCI. UTRAN decides if a TFCI should

    be transmitted, UE must support TFCI.

    Possible rates are the same as that of

    downlink DPCH

    SF =256 - 4.

    FACH and PCH can be mapped to the

    same or separate SCCPCHs. If

    mapped to the same S-CCPCH, they

    can be mapped to the same fame.

    Data

    N bits

    Slot #0 Slot #1 Slot #i Slot #14

    1 radio frame: T f = 10 ms

    T slot = 2560 chips,

    Data

    Pilot

    N bitsPilotN bitsTFCI

    TFCI

    20*2 k bits (k=0..6)

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    Physical Random Access Channel (PRACH) The random-access transmission data consists of two parts:

    One or several preambleseach preamble is of length 4096chips and consistsof 256 repetitions of a signature whose length is 16 chips16 availablesignatures totally

    10 or 20ms message part

    Which signature is available and the length of message part are determined byhigher layer

    Message partPreamble

    4096 chips10 ms (one radio frame)

    Preamble Preamble

    Message partPreamble

    4096 chips 20 ms (two radio frames)

    Preamble Preamble

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    PRACH Access Timeslot Structure

    #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 #12 #13 #14

    5120 chips

    radio frame: 10 ms radio frame: 10 ms

    Access slot #0 Random Access Transmission

    Access slot #1

    Access slot #7

    Access slot #14

    Random Access Transmission

    Random Access Transmission

    Random Access TransmissionAccess slot #8

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    PRACH Message Structure

    Pilot

    N bits

    Slot # 0 Slot # 1 Slot # i Slot # 14

    Message part radio frame TRACH = 10 ms

    Tslot = 2560 chips, 10*2

    Pilot

    TFCI

    N bitsTFCI

    Data

    Ndata

    bitsData

    Control

    kbits (k=0..3)

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    Acquisition Indicator Channel (AICH) Frame structure of AICHtwo frames, 20 msconsists of a repeated

    sequence of 15 consecutive AS, each of length 20 symbols(5120 chips).Each time slot consists of two partsan Acquisition-Indicator(AI) and a

    part of duration 1024chips with no transmission.

    Acquisition-Indicator AI have 16 kinds of Signature.

    CPICH is the phase reference of AICH.

    AS #14 AS #0 AS #1 AS #i AS #14 AS #0

    a1 a2a0 a31 a32a30 a33 a38 a39

    AI part Unused part

    20 ms

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    Uplink Dedicated Physical Channel (DPDCH&DPCCH)

    DPDCH and DPCCH are I/Q code multiplexed within each radio frame

    DPDCH carries data generated at Layer 2 and higher layer

    DPCCH carries control information generated at Layer 1

    Each frame is 10ms and consists of 15 time slots, each time slot

    consists of 2560 chips

    The spreading factor of DPDCH is from 4 to 256

    The spreading factor of DPDCH and DPCCH can be different in the

    same Layer 1 connection

    Each DPCCH time slot consists of Pilot, TFCIFBITPC

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    Frame Structure of Uplink DPDCH/DPCCH

    PilotNpilotbits

    TPCNTPCbits

    DataNdatabits

    Slot #0 Slot #1 Slot #i Slot #14

    Tslot = 2560 chips, 10 *2k bits (k=0..6)

    1 radio frame: T = 10 msf

    DPDCH

    DPCCHFBI

    NFBIbitsTFCI

    NTFCIbits

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    Downlink Dedicated Physical Channel (DPDCH+DPCCH)

    DCH consists of dedicated data and control information.

    Control information includesPilotTPCTFCI(optional).

    The spreading factor of DCH can be from 512 to 4,and can be

    changed during connection

    DPDCH and DPCCH is time multiplexed.

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    Frame Structure of Downlink DPCH

    One radio frame, Tf = 10 ms

    Slot #0 Slot #1 Slot #i Slot #14

    Tslot = 2560 chips, 10*2k

    bits (k=0..7)

    Data2

    Ndata2bits

    DPDCH

    TFCI

    NTFCIbits

    Pilot

    NpilotbitsData1

    Ndata1bits

    DPDCH DPCCH DPCCH

    TPC

    NTPCbits

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    High-Speed Physical Downlink Shared Channel (HS-PDSCH)

    Bear service data and layer2 overhead bits mapped from the transportchannel

    SF=16, can be configured several channels to increase data service

    Slot #0 Slot#1 Slot #2

    T slot = 2560 chips, M*10*2kbits (k=4)

    Data

    N Data 1bits

    1 subframe: Tf = 2 ms

    S S C C ( S SCC )

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    High-Speed Shared Control Channel (HS-SCCH)

    Carries physical layer signalling to a single UE ,such as modulation

    scheme (1 bit) ,channelization code set (7 bit), transport Block size

    (6bit),HARQ process number (3bit), redundancy version (3bit), new

    data indicator (1bit), Ue identity (16bit)

    HS-SCCH is a fixed rate (60 kbps, SF=128) downlink physical channel

    used to carry downlink signalling related to HS-DSCH transmission

    Slot #0 Slot#1 Slot #2

    T slot= 2560 chips, 40 bits

    DataN Data 1bits

    1 subframe: T f = 2 ms

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    High-Speed Dedicated Physical Control Channel (HS-DPCCH )

    HS-DPCCH carries information to acknowledge downlink transportblocks and feedback information to the system for scheduling and link

    adaptation of transport block

    CQI and ACK/NACK

    Physical Channel ,Uplink, SF=256,power control

    Subframe #0 Subframe #i Subframe #4

    HARQ-ACK CQI

    One radio frame T = 10 ms

    One HS-DPCCH subframe (2 ms)

    2Tslot= 5120 chipsTslot= 2560 chips

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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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    Mapping Between Channels

    Logical channels Transport channels Physical channels

    BCCH BCH P-CCPCH

    FACH S-CCPCH

    PCCH PCH S-CCPCH

    CCCH RACH PRACH

    FACH S-CCPCH

    CTCH FACH S-CCPCH

    DCCH, DTCH DCH DPDCH

    HS-DSCH HS-PDSCH

    RACH, FACH PRACH, S-CCPCH

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    Chapter 1 CDMA Fundamental

    Chapter 2 WCDMA Key Technologies

    Chapter 3 Physical Layer Overview

    Chapter 4 WCDMA Key Technology

    Chapter 5 Physical Layer Procedures

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    Synchronization ProcedureCell Search

    Frame synchronization and

    code-group identification

    Scrambling-code

    identification

    UE uses SSC to find frame

    synchronization and identify the

    code group of the cell found in

    the first step

    UE determines the primary scrambling

    code through correlation over theCPICH with all codes within the

    identified group, and then detects the

    P-CCPCH and reads BCH information

    Slot synchronizationUE uses PSC to acquire slot

    synchronization to a cell

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    Synchronization ProcedureChannel Timing Relationship

    AICH accessslots

    SecondarySCH

    PrimarySCH

    S-CCPCH,k

    10 ms

    PICH

    #0 #1 #2 #3 #14#13#12#11#10#9#8#7#6#5#4

    P-CCPCH, (SFN modulo 2) = 0 P-CCPCH, (SFN modulo 2) = 1

    Any CPICH

    k:th S -CCPCH

    PICH for k:th S -CCPCH

    n:th DPCHDPCH,n

    Random access procedure

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    Random access procedure STARTChoose a RACH sub channel from

    available ones

    Get available signatures

    Set Preamble Retrans Max

    Set Preamble_Initial_Power

    Send a preamble

    Check the corresponding AI

    Increase message part power by p

    -m based on preamble power

    Set physical status to be RACH

    message transmitted Set physical status to be Nackon AICH received

    Choose a access slot again

    Counter> 0 & Preamble power-

    maximum allowed power

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    Random Access ProcedureRACH

    Physical random access procedure1. Derive the available uplink access slots, in the next full access

    slot set, for the set of available RACH sub-channels within the

    given ASC. Randomly select one access slot among the ones

    previously determined. If there is no access slot available in the

    selected set, randomly select one uplink access slot correspondingto the set of available RACH sub-channels within the given ASC

    from the next access slot set. The random function shall be such

    that each of the allowed selections is chosen with equal probability

    2. Randomly select a signature from the set of available signatures

    within the given ASC.3. Set the Preamble Retransmission Counter to Preamble_

    Retrans_ Max

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    Random Access ProcedureRACH

    4. Set the parameter Commanded Preamble Power toPreamble_Initial_Power

    5. Transmit a preamble using the selected uplink access slot, signature, and

    preamble transmission power.

    6. If no positive or negative acquisition indicator (AI +1 nor1)

    corresponding to the selected signature is detected in the downlink accessslot corresponding to the selected uplink access slot:

    A: Select the next available access slot in the set of available RACH

    sub-channels within the given ASC;

    B: select a signature;

    C: Increase the Commanded Preamble Power; D: Decrease the Preamble Retransmission Counter by one. If the

    Preamble Retransmission Counter > 0 then repeat from step 6.

    Otherwise exit the physical random access procedure.

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    Random Access ProcedureRACH

    7. If a negative acquisition indicator corresponding to the selected

    signature is detected in the downlink access slot corresponding to

    the selected uplink access slot, exit the physical random access

    procedure Signature

    8. If a positive acquisition indicator corresponding to the selected

    signature is detected , Transmit the random access message three

    or four uplink access slots after the uplink access slot of the last

    transmitted preamble

    9. exit the physical random access procedure

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