8/8/2019 Slide UMTS.09std
1/57
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
8/8/2019 Slide UMTS.09std
2/57
2
Mng thng tin di ng 3G
UMTS / W-CDMA
(Universal Mobile Telecommunications System)
3.3. GiaoGiao dindin vv tuyntuyn UuUu
8/8/2019 Slide UMTS.09std
3/57
UMTS Network Architecture
8/8/2019 Slide UMTS.09std
4/57
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
8/8/2019 Slide UMTS.09std
5/57
UMTS Protocol Architecture
8/8/2019 Slide UMTS.09std
6/57
8/8/2019 Slide UMTS.09std
7/57
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
8/8/2019 Slide UMTS.09std
8/57
Logical, Transport and Physical channels
8/8/2019 Slide UMTS.09std
9/57
Logical Channel - UMTS
Node B
UE
8/8/2019 Slide UMTS.09std
10/57
Transport Channel - UMTS
Node B UE
8/8/2019 Slide UMTS.09std
11/57
Physical Channel - UMTS
Node BUE
8/8/2019 Slide UMTS.09std
12/57
UMTS Channels
8/8/2019 Slide UMTS.09std
13/57
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)
8/8/2019 Slide UMTS.09std
14/57
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
8/8/2019 Slide UMTS.09std
15/57
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)
8/8/2019 Slide UMTS.09std
16/57
UMTS Channel Mapping
8/8/2019 Slide UMTS.09std
17/57
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
8/8/2019 Slide UMTS.09std
18/57
Layer 1 - up link physical channels
8/8/2019 Slide UMTS.09std
19/57
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
8/8/2019 Slide UMTS.09std
20/57
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
8/8/2019 Slide UMTS.09std
21/57
Layer 1 - down link physical channels
8/8/2019 Slide UMTS.09std
22/57
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)
8/8/2019 Slide UMTS.09std
23/57
8/8/2019 Slide UMTS.09std
24/57
Node B
8/8/2019 Slide UMTS.09std
25/57
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
8/8/2019 Slide UMTS.09std
26/57
Mapping transport channels onto physical channels
8/8/2019 Slide UMTS.09std
27/57
Node B
8/8/2019 Slide UMTS.09std
28/57
Node B
8/8/2019 Slide UMTS.09std
29/57
Node B
8/8/2019 Slide UMTS.09std
30/57
8/8/2019 Slide UMTS.09std
31/57
8/8/2019 Slide UMTS.09std
32/57
8/8/2019 Slide UMTS.09std
33/57
8/8/2019 Slide UMTS.09std
34/57
8/8/2019 Slide UMTS.09std
35/57
8/8/2019 Slide UMTS.09std
36/57
8/8/2019 Slide UMTS.09std
37/57
8/8/2019 Slide UMTS.09std
38/57
8/8/2019 Slide UMTS.09std
39/57
8/8/2019 Slide UMTS.09std
40/57
Mapping between Logical, Transport and Physical
channels
8/8/2019 Slide UMTS.09std
41/57
8/8/2019 Slide UMTS.09std
42/57
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)
8/8/2019 Slide UMTS.09std
43/57
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
8/8/2019 Slide UMTS.09std
44/57
8/8/2019 Slide UMTS.09std
45/57
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
8/8/2019 Slide UMTS.09std
46/57
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
8/8/2019 Slide UMTS.09std
47/57
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
8/8/2019 Slide UMTS.09std
48/57
8/8/2019 Slide UMTS.09std
49/57
8/8/2019 Slide UMTS.09std
50/57
8/8/2019 Slide UMTS.09std
51/57
8/8/2019 Slide UMTS.09std
52/57
Frame structure for uplink DPDCH/DPCCH
8/8/2019 Slide UMTS.09std
53/57
8/8/2019 Slide UMTS.09std
54/57
8/8/2019 Slide UMTS.09std
55/57
8/8/2019 Slide UMTS.09std
56/57
8/8/2019 Slide UMTS.09std
57/57