Content for TS 25.221 Word version: 18.0.0

4.1 Transport channels 4.2 Indicators
...

1 Scope 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 p. 13

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 ".

3 Abbreviations 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

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

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

MBMS Notification Indicator

NRT

Non-Real Time

OVSF

Orthogonal Variable Spreading Factor

P-CCPCH

Primary CCPCH

PCH

Paging Channel

PDSCH

Physical Downlink Shared Channel

Paging Indicator (value calculated by higher layers)

PICH

Page Indicator Channel

PLCCH

Physical Layer Common Control Channel

Paging Indicator (indicator set by physical layer)

PRACH

Physical Random Access Channel

PUSCH

Physical Uplink Shared Channel

RACH

Random Access Channel

Radio Frame

Real Time

S-CCPCH

Secondary CCPCH

SCH

Synchronisation Channel

SCTD

Space Code Transmit Diversity

Spreading Factor

SFN

Cell System Frame Number

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

User Equipment

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

4 Services offered to higher layers p. 15

4.1 Transport channels p. 15

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 p. 15

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| p. 15

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| p. 15

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 p. 15

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 Channel 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 p. 16

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 p. 16

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 p. 16

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 p. 16

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 p. 16

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| p. 16

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.

4.1.2.8 E-DCH - Enhanced Dedicated Channel |R8| p. 16

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 p. 16

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).