slide umts.09std

8/8/2019 Slide UMTS.09std

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Trng i hc Bch Khoa H Ni

Khoa in t Vin thng

Thng tin di ngMobile Communications

TS. Trng TunB mn K thut thng tin

H Ni, 10-2010


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2

Mng thng tin di ng 3G

UMTS / W-CDMA

(Universal Mobile Telecommunications System)

3.3. GiaoGiao dindin vv tuyntuyn UuUu


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UMTS Network Architecture


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RLCRLC

LACLAC

Radio Interface - protocol architecture

RLC

RRC

LAC

MAC

Physical Layer

L3

L2/LAC

L2/MAC

L1

C-plane U-plane

Logicalchannels

Transportchannels

RLC

L1: Radio Physical LayerL1: Radio Physical Layer

L2: Radio Link/AccessL2: Radio Link/AccessControl + Media AccessControl + Media AccessControlControl

L3: Radio NetworkL3: Radio NetworkLayerLayer


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UMTS Protocol Architecture


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Logical, Transport and Physical channels

Logical channel: an information stream dedicated to

the transfer of a specific type of information

Transport channel: described by how data are

transferred

Physical channel: defined by thefrequency, phase (I,Q)

and code

UE Node B RNC

Logical ChannelsLogical Channels

Transport ChannelsTransport Channels

Physical ChannelsPhysical Channels


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Logical, Transport and Physical channels


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Logical Channel - UMTS

Node B

UE


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Transport Channel - UMTS

Node B UE


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Physical Channel - UMTS

Node BUE


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UMTS Channels


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UMTS Logical Channels

Broadcast Control Channel (BCCH), Downlink (DL)

Paging Control Channel (PCCH), DL

Dedicated Control Channel (DCCH), UL/DL

Common Control Channel (CCCH), UL/DL

Dedicated Traffic Channel (DTCH), UL/DL

Common Traffic Channel (CTCH), Unidirectional (one to many)


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UMTS Transport Channels

Dedicated Transport Channel (DCH), UL/DL, mapped to DCCH and DTCH

Broadcast Channel (BCH), DL, mapped to BCCH

Forward Access Channel (FACH), DL, mapped to BCCH, CCCH, CTCH, DCCH

and DTCH

Paging Channel (PCH), DL, mapped to PCCH

Random Access Channel (RACH), UL, mapped to CCCH, DCCH and DTCH

Uplink Common Packet Channel (CPCH), UL, mapped to DCCH and DTCH

Downlink Shared Channel (DSCH), DL, mapped to DCCH and DTCH


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UMTS Physical ChannelsPrimary Common Control Physical Channel (PCCPCH), mapped to BCH

Secondary Common Control Physical Channel (SCCPCH), mapped to FACH,

PCH

Physical Random Access Channel (PRACH), mapped to RACH

Dedicated Physical Data Channel (DPDCH), mapped to DCH

Dedicated Physical Control Channel (DPCCH), mapped to DCH

Physical Downlink Shared Channel (PDSCH), mapped to DSCH

Physical Common Packet Channel (PCPCH), mapped to CPCH

Synchronisation Channel (SCH)

Common Pilot Channel (CPICH)

Acquisition Indicator Channel (AICH)

Paging Indication Channel (PICH)

CPCH Status Indication Channel (CSICH)

Collision Detection/Channel Assignment Indication Channel (CD/CA-ICH)


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UMTS Channel Mapping


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Layer 1 - up link physical channels

Data

Pilot

Dedicated PhysicalData Channel

Dedicated Physical

Control ChannelTPC TFI

Slot#1Slot#2 Slot#i Slot#15

Frame#1Frame#2 Frame#i Frame#72

0.667 ms

10 ms

FBI

frame

superframe

FBI: FeedBack Indicator TPC: Transmit Power Control

TFI: Transport Format Indicator


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Layer 1 - up link physical channels


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Uplink Variable Rate

1-rate

10 ms

Variablerate

1/2-rate

1/4-rate

0-rate

: DPCCH (Pilot+TPC+RI)

: DPDCH (Data)

R = 1 R = 1/2 R = 0 R = 0 R = 1/2


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Layer 1 - down link physical channels

Data

Slot#1Slot#2 Slot#i Slot#15

Frame#1Frame#2 Frame#i Frame#72

Pilot TPC TFI

DPCCH DPDCH

frame

superframe

0.667 ms

10 ms


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Layer 1 - down link physical channels


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Downlink Variable Rate (DTX based)

1-rate

1/2-rate

1/4-rate

0-rate

0.625 ms

: DPCCH-part (Pilot+TPC+RI)

: DPDCH-part (Data)


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Node B


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Multiplexing transport channels onto

physical channels

DCH

DCH

DCH

DCH

c

oding

inte

rleaving

coding

interleaving

rate

ma

tching

rate

matching

inte

rleaving

interleaving

rate

matching

interleaving

m

ultiplexing

inter frameinterleaving

intra frameinterleaving

static

dynamic(up link)

trasport channelsmultiplexing


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Mapping transport channels onto physical channels


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Node B


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Node B


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Node B


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Mapping between Logical, Transport and Physical

channels


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Transport Channels

In WCDMA there exists two types of transport channels:

Dedicated Channels (DCHs) Resources are reserved for a single user only (continuous and independent from

the DCHs of other UEs)

Common channels Resources are shared between users

The main transport channels used for packet data transmissions inWCDMA are called

DCH

Forward Access Channel (FACH)


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DCH is used to carry

User data

All higher layer control information, such ashandover commands

DCH is characterized by features such as

Fast power control

Soft handover

Fast data rate change on a frame-by-frame basis is

supported in the uplink In the downlink data rate variation is taken care of

either with a rate-matching operation or withDiscontinuous Transmission (DTX) instead of varying

spreading factor frame-by-frame basis

Transport Channels


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However, there can be more than one FACH in a cell which makes itpossible to have higher bit rates for the other FACHs

The FACH does not support fast power control

In addition to FACH there are five different common channels inWCDMA:

Broadcast Channel (BCH) Used to transmit information specific to the UTRA network or for a given cell,

e.g. random access codes

Channel needs to be reached by all UEs within the cell

Paging Channel (PCH)

Carries data relevant to the paging procedure, i.e. when the network wants toinitiate communication with the terminal

Terminals must be able to receive the paging information in the whole cell area

Transport Channels


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Random Access Channel (RACH) Uplink transport channel intended to be used to carry control information from

the terminal, such as requests to set up a connection

Uplink Common Packet Channel (CPCH) Extension to the RACH channel that is intended to carry packet-based user data

in the uplink direction

Dedicated Shared Channel (DSCH) Carries user data and/or control information; it can be shared by several users

Transport Channels


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From the common channels DSCH was optional feature that wasseldom implemented by the operators and later replaced in practicewith High Speed Downlink Packet Access (HSDPA)

3GPP decided to take DSCH away from Release5 specifications onwards

Also CPCH has been taken out of thespecifications from Rel5 onwards as it was notimplemented in any of the practical networks

Transport Channels


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Frame structure for uplink DPDCH/DPCCH


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slide umts.09std

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