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Content for  TS 25.221  Word version:  16.0.0

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1  ScopeWord‑p. 13

The present document describes the characteristics of the physicals channels and the mapping of the transport channels to physical channels in the TDD mode of UTRA.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies.
[1]
TS 25.201: "Physical layer - general description".
[2]
TS 25.211: "Physical channels and mapping of transport channels onto physical channels (FDD)".
[3]
TS 25.212: "Multiplexing and channel coding (FDD)".
[4]
TS 25.213: "Spreading and modulation (FDD)".
[5]
TS 25.214: "Physical layer procedures (FDD)".
[6]
TS 25.215: "Physical layer - Measurements (FDD)".
[7]
TS 25.222: "Multiplexing and channel coding (TDD)".
[8]
TS 25.223: "Spreading and modulation (TDD)".
[9]
TS 25.224: "Physical layer procedures (TDD)".
[10]
TS 25.225: "Physical layer - Measurements (TDD)".
[11]
TS 25.301: "Radio Interface Protocol Architecture".
[12]
TS 25.302: "Services Provided by the Physical Layer".
[13]
TS 25.401: "UTRAN Overall Description".
[14]
TS 25.402: "Synchronisation in UTRAN, Stage 2".
[15]
TS 25.304: "UE Procedures in Idle Mode and Procedures for Cell Reselection in Connected Mode".
[16]
TS 25.427: "UTRAN Iur and Iub interface user plane protocols for DCH data streams".
[17]
TS 25.435: "UTRAN Iub Interface User Plane Protocols for Common Transport Channel Data Streams".
[18]
TS 25.308: High Speed Downlink Packet Access (HSDPA); Overall description; Stage 2
[19]
TS 25.331: "RRC Protocol Specification ".
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3  AbbreviationsWord‑p. 14

For the purposes of the present document, the following abbreviations apply:
16QAM
16 Quadrature Amplitude Modulation
BCH
Broadcast Channel
CCPCH
Common Control Physical Channel
CCTrCH
Coded Composite Transport Channel
CDMA
Code Division Multiple Access
CQI
Channel Quality Indicator
DCH
Dedicated Channel
DL
Downlink
DPCH
Dedicated Physical Channel
DRX
Discontinuous Reception
DSCH
Downlink Shared Channel
DTX
Discontinuous Transmission
DwPCH
Downlink Pilot Channel
DwPTS
Downlink Pilot Time Slot
E-AGCH
E-DCH Absolute Grant Channel
E-DCH
Enhanced Dedicated Channel
E-HICH
E-DCH Hybrid ARQ Indicator Channel
E-PUCH
E-DCH Physical Uplink Channel
E-RUCCH
E-DCH Random Access Uplink Control Channel
E-UCCH
E-DCH Uplink Control Channel
FACH
Forward Access Channel
FDD
Frequency Division Duplex
FEC
Forward Error Correction
GP
Guard Period
GSM
Global System for Mobile Communication
HARQ
Hybrid ARQ
HS-DSCH
High Speed Downlink Shared Channel
HS-PDSCH
High Speed Physical Downlink Shared Channel
HS-SCCH
Shared Control Channel for HS-DSCH
HS-SICH
Shared Information Channel for HS-DSCH
IMB
Integrated Mobile Broadcast
MBSFN
MBMS over a Single Frequency Network
MIB
Master Information Block
MICH
MBMS Indicator Channel
MIMO
single user Multiple Input Multiple Output
MS burst
MBSFN Special burst
MT burst
MBSFN Traffic burst
MU-MIMO
Multi-User Multiple Input Multiple Output
NI
MBMS Notification Indicator
NRT
Non-Real Time
OVSF
Orthogonal Variable Spreading Factor
P-CCPCH
Primary CCPCH
PCH
Paging Channel
PDSCH
Physical Downlink Shared Channel
PI
Paging Indicator (value calculated by higher layers)
PICH
Page Indicator Channel
PLCCH
Physical Layer Common Control Channel
Pq
Paging Indicator (indicator set by physical layer)
PRACH
Physical Random Access Channel
PUSCH
Physical Uplink Shared Channel
RACH
Random Access Channel
RF
Radio Frame
RT
Real Time
S-CCPCH
Secondary CCPCH
SCH
Synchronisation Channel
SCTD
Space Code Transmit Diversity
SF
Spreading Factor
SFN
Cell System Frame Number
SS
Synchronisation Shift
TCH
Traffic Channel
TDD
Time Division Duplex
TDMA
Time Division Multiple Access
TFC
Transport Format Combination
TFCI
Transport Format Combination Indicator
TFI
Transport Format Indicator
TPC
Transmitter Power Control
TrCH
Transport Channel
TSTD
Time Switched Transmit Diversity
TTI
Transmission Time Interval
UE
User Equipment
UL
Uplink
UMTS
Universal Mobil Telecommunications System
UpPTS
Uplink Pilot Time Slot
UpPCH
Uplink Pilot Channel
USCH
Uplink Shared Channel
UTRAN
UMTS Terrestrial Radio Access Network
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4  Services offered to higher layersWord‑p. 15

4.1  Transport channels

Transport channels are the services offered by layer 1 to the higher layers. A transport channel is defined by how and with what characteristics data is transferred over the air interface. A general classification of transport channels is into two groups:
  • Dedicated Channels, using inherent addressing of UE
  • Common Channels, using explicit addressing of UE if addressing is needed
General concepts about transport channels are described in [12].

4.1.1  Dedicated transport channels

There exists two types of dedicated transport channel, the Dedicated Channel (DCH) and the Enhanced Dedicated Channel (E-DCH).

4.1.1.1  DCH - Dedicated Channel |R7|

The Dedicated Channel (DCH) is an up- or downlink transport channel that is used to carry user or control information between the UTRAN and a UE.

4.1.1.2  E-DCH - Enhanced Dedicated Channel |R7|

The Enhanced Dedicated Channel (E-DCH) is an uplink transport channel.
For 1.28Mcps TDD multi-carrier E-DCH transmission, a UE in CELL_DCH state shall have only one E-DCH per carrier. There would be one or more E-DCHs to be transmitted from a UE in CELL_DCH state in a TTI.

4.1.2  Common transport channels

There are seven types of common transport channels for 3.84Mcps and 7.68Mcps TDD: BCH, FACH, PCH, RACH, USCH, DSCH, HS-DSCH.
There are eight types of common transport channels for 1.28Mcps TDD: BCH, FACH, PCH, RACH, USCH, DSCH, HS-DSCH, E-DCH.

4.1.2.1  BCH - Broadcast ChannelWord‑p. 16

The Broadcast Channel (BCH) is a downlink transport channel that is used to broadcast system- and cell-specific information.

4.1.2.2  FACH - Forward Access Channel

The Forward Access Channel (FACH) is a downlink transport channel that is used to carry control information to a mobile station when the system knows the location cell of the mobile station. The FACH may also carry short user packets.

4.1.2.3  PCH - Paging Channel

The Paging Channel (PCH) is a downlink transport channel that is used to carry control information to a mobile station when the system does not know the location cell of the mobile station.

4.1.2.4  RACH - Random Access Channel

The Random Access Channel (RACH) is an up link transport channel that is used to carry control information from mobile station. The RACH may also carry short user packets.

4.1.2.5  USCH - Uplink Shared Channel

The uplink shared channel (USCH) is an uplink transport channel shared by several UEs carrying dedicated control or traffic data.

4.1.2.6  DSCH - Downlink Shared Channel

The downlink shared channel (DSCH) is a downlink transport channel shared by several UEs carrying dedicated control or traffic data.

4.1.2.7  HS-DSCH - High Speed Downlink Shared Channel |R5|

The High Speed Downlink Shared Channel (HS-DSCH) is a downlink transport channel shared by several UEs. The HS-DSCH is associated with one or several Shared Control Channels (HS-SCCH). The HS-DSCH is transmitted over the entire cell or over only part of the cell using e.g. beam-forming antennas.
For 1.28Mcps TDD, in a multi-frequency HS-DSCH cell, the HS-DSCH may be transmitted to a UE on one or more carriers in CELL_DCH state and on only one carrier in CELL_FACH, CELL_PCH and URA_PCH state in a TTI. The term 'multi-carrier HS-DSCH reception' refers to the HS-DSCH reception on multiple carriers in a TTI for a UE.
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4.1.2.8  E-DCH - Enhanced Dedicated Channel |R8|

The Enhanced Dedicated Channel (E-DCH) is an uplink transport channel in CELL_FACH and IDLE mode for 1.28Mcps TDD only.

4.2  Indicators

Indicators are means of fast low-level signalling entities which are transmitted without using information blocks sent over transport channels. The meaning of indicators is implicit to the receiver.
The indicator(s) defined in the current version of the specifications are: Paging Indicator (PI) and MBMS Notification Indicator (NI).

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