ETSI TS 125 430 V16.0.0 (2020-08)

ETSI TS 125 430 V16.0.0 (2020-08)
TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
UTRAN Iub Interface: general aspects and principles
(3GPP TS 25.430 version 16.0.0 Release 16)
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3GPP TS 25.430 version 16.0.0 Release 16 1 ETSI TS 125 430 V16.0.0 (2020-08)
Reference
RTS/TSGR-0325430vg00
Keywords
UMTS
ETSI
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Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

Modal verbs terminology .................................................................................................................................... 2

Foreword ............................................................................................................................................................. 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

3 Definitions and abbreviations ................................................................................................................... 6

3.1 Definitions .......................................................................................................................................................... 6

3.2 Abbreviations ..................................................................................................................................................... 7

3.3 Specification Notations ...................................................................................................................................... 8

4 General Aspects ........................................................................................................................................ 9

4.1 Introduction ........................................................................................................................................................ 9

4.2 Iub Interface General Principles ......................................................................................................................... 9

4.3 Iub Interface Specification Objectives ............................................................................................................... 9

4.4 Iub Interface Capabilities ................................................................................................................................... 9

4.4.1 Radio application related signalling .............................................................................................................. 9

4.4.2 Iub/Iur DCH data stream ............................................................................................................................. 10

4.4.3 Iub RACH data stream ................................................................................................................................ 10

4.4.4 Iub CPCH data stream [FDD] ..................................................................................................................... 10

4.4.5 Iub FACH data stream ................................................................................................................................ 10

4.4.6 Iub DSCH data stream [TDD] .................................................................................................................... 10

4.4.7 Iub USCH data stream [TDD] .................................................................................................................... 10

4.4.8 Iub PCH data stream ................................................................................................................................... 10

4.4.9 Iub FDD TFCI2 data stream ....................................................................................................................... 10

4.4.10 Iub HS-DSCH data stream .......................................................................................................................... 11

4.4.11 Iub E-DCH data stream ............................................................................................................................... 11

4.5 Iub Interface Characteristics ............................................................................................................................. 11

4.5.1 Mapping of Iub data streams....................................................................................................................... 11

4.6 Iub Protocols .................................................................................................................................................... 11

5 Functions of the I Interface Protocols .................................................................................................. 12

5.1 Iub Functions .................................................................................................................................................... 12

5.2 Functional split over Iub ................................................................................................................................... 13

5.2.1 Management of Iub Transport Resources ................................................................................................... 13

5.2.2 Logical O&M of Node B ............................................................................................................................ 13

5.2.2.1 Handling of Node B Hardware Resources ............................................................................................ 13

5.2.3 Implementation Specific O&M Transport .................................................................................................. 13

5.2.4 System Information Management ............................................................................................................... 13

5.2.5 Traffic management of Common Channels ................................................................................................ 14

5.2.6 Traffic management of Dedicated Channels ............................................................................................... 14

5.2.6.1 Combining/Splitting and Control .......................................................................................................... 14

5.2.6.2 Handover Decision ................................................................................................................................ 14

5.2.6.3 Allocation of Physical Channel Resources ........................................................................................... 14

5.2.6.4 UpLink Power Control .......................................................................................................................... 14

5.2.6.5 Down-Link Power Control .................................................................................................................... 15

5.2.6.6 Admission Control ................................................................................................................................ 15

5.2.6.7 Power and Interference Reporting ......................................................................................................... 15

5.2.7 Traffic management of Shared Channels [TDD] ........................................................................................ 15

5.2.7A Traffic management of High Speed Shared Channels ................................................................................ 15

5.2.8 Timing and Synchronization Management ................................................................................................. 15

6 Node B logical Model over Iub .............................................................................................................. 15

6.1 Overview .......................................................................................................................................................... 15

6.2 Elements of the logical model .......................................................................................................................... 16

6.2.1 Node B Communication Contexts for Dedicated and Shared Channels ..................................................... 16

6.2.2 Common Transport Channels ..................................................................................................................... 17

6.2.3 Transport network logical resources ........................................................................................................... 17

6.2.3.1 Node B Control Port.............................................................................................................................. 17

6.2.3.2 Communication Control Port ................................................................................................................ 17

6.2.3.3 Traffic Termination Point ..................................................................................................................... 17

6.2.3.4 Iub DCH Data Port ................................................................................................................................ 18

6.2.3.5 Iub RACH Data Port ............................................................................................................................. 18

6.2.3.6 Iub CPCH Data Port [FDD] .................................................................................................................. 18

6.2.3.7 Iub FACH Data Port.............................................................................................................................. 18

6.2.3.8 Iub DSCH Data Port [TDD] .................................................................................................................. 18

6.2.3.8A Iub HS-DSCH Data Port ....................................................................................................................... 18

6.2.3.9 Iub USCH Data Port [TDD] .................................................................................................................. 18

6.2.3.10 Iub PCH Data Port ................................................................................................................................ 18

6.2.3.11 Iub FDD TFCI2 Data Port ..................................................................................................................... 18

6.2.3.12 Iub E-DCH Data Port ............................................................................................................................ 18

6.2.4 Radio Network Logical resources ............................................................................................................... 19

6.2.4.1 Common Resources .............................................................................................................................. 19

6.2.4.2 Cell ........................................................................................................................................................ 19

6.2.4.3 Common Physical Channels and Common Transport Channels ........................................................... 21

6.2.4.4 Physical Shared Channels ..................................................................................................................... 22

7 Iub Interface Protocol Structure ............................................................................................................. 23

8 Other Iub Interface Specifications .......................................................................................................... 23

8.1 UTRAN Iub Interface: Layer 1 (TSG RAN 25.431) ........................................................................................ 23

8.2 UTRAN Iub Interface: Signalling Transport (TSG RAN 25.432) ................................................................... 23

8.3 NBAP Specification (TSG RAN 25.433) ......................................................................................................... 24

8.4 UTRAN Iub Interface: Data Transport & Transport Signalling for Common Transport Channel Data

Streams (TSG RAN 25.434)............................................................................................................................. 24

8.5 UTRAN Iub Interface: User Plane Protocols for Common Transport Channel Data Streams (TSG RAN

25.435 ............................................................................................................................................................... 24

8.6 UTRAN Iur/Iub Interface: Data Transport & Transport Signalling for DCH Data Streams (TSG RAN

25.426) ............................................................................................................................................................. 24

8.7 UTRAN Iur/Iub Interface: User Plane Protocol for DCH Data Streams (TSG RAN 25.427) ......................... 24

8.8 Summary of UTRAN Iub Interface Technical Specifications .......................................................................... 25

Annex A (informative): Change history ............................................................................................... 26

History .............................................................................................................................................................. 27

This Technical Specification (TS) has been produced by the 3 Generation Partnership Project (3GPP).

The contents of the present document are subject to continuing work within the TSG and may change following formal

TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an

y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,

z the third digit is incremented when editorial only changes have been incorporated in the document.

The present document is an introduction to the TSG RAN TS 25.43x series of UMTS Technical Specifications that

define the Iub Interface. The Iub interface is a logical interface for the interconnection of Node B and Radio Network

Controller (RNC) components of the UMTS Terrestrial Radio Access Network (UTRAN) for the UMTS system.

The following documents contain provisions which, through reference in this text, constitute provisions of the present

● References are either specific (identified by date of publication, edition number, version number, etc.) or

● For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including

a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same

[7] 3GPP TS 25.433: "UTRAN Iub interface Node B Application Part (NBAP) signalling".

[8] 3GPP TS 25.434: "UTRAN Iub Interface Data Transport and Transport Signalling for Common

[9] 3GPP TS 25.435: "UTRAN Iub Interface user plane protocols for Common Transport Channel

[10] 3GPP TS 25.426: "UTRAN Iur and Iub Interface data transport & transport signalling for DCH

[11] 3GPP TS 25.427: "UTRAN Iur/Iub Interface user plane protocol for DCH data streams".

[13] ITU-T Recommendation Q.2630.2 (1999-12): "AAL type 2 Signalling Protocol (Capability Set

For the purposes of the present document, the following terms and definitions apply:

Propagation delay (PD): it is the round trip propagation delay of the radio signal from the Node B to the UE and back

Timing Advance (TA): it is the amount of time, expressed in number of chips, by which the transmission of an uplink

burst is anticipated by the UE in order to be received by the cell inside the corresponding time slot.

[FDD] This tagging of a word indicates that the word preceding the tag "[FDD]" applies only to FDD.

This tagging of a heading indicates that the heading preceding the tag "[FDD]" and the section

[TDD] This tagging of a word indicates that the word preceding the tag "[TDD]" applies only to TDD,

including 7.68 Mcps TDD, 3.84Mcps TDD and 1.28Mcps TDD. This tagging of a heading

indicates that the heading preceding the tag "[TDD]" and the section following the heading applies

[7.68Mcps TDD] This tagging of a word indicates that the word preceding the tag "[7.68Mcps TDD]" applies only

to 7.68Mcps TDD. This tagging of a heading indicates that the heading preceding the tag

"[7.68Mcps TDD]" and the section following the heading applies only to 7.68Mcps TDD.

[3.84Mcps TDD] This tagging of a word indicates that the word preceding the tag “[3.84Mcps TDD]” applies only

to 3.84Mcps TDD. This tagging of a heading indicates that the heading preceding the tag

“[3.84Mcps TDD]” and the section following the heading applies only to 3.84Mcps TDD.

[1.28Mcps TDD] This tagging of a word indicates that the word preceding the tag "[1.28Mcps TDD]" applies only

to 1.28Mcps TDD. This tagging of a heading indicates that the heading preceding the tag

"[1.28Mcps TDD]" and the section following the heading applies only to 1.28Mcps TDD.

[FDD - …] This tagging indicates that the enclosed text following the "[FDD - " applies only to FDD.

Multiple sequential paragraphs applying only to FDD are enclosed separately to enable insertion of

[TDD - …] This tagging indicates that the enclosed text following the "[TDD - " applies only to TDD,

including 7.68 Mcps TDD, 3.84Mcps TDD and 1.28Mcps TDD. Multiple sequential paragraphs

applying only to TDD are enclosed separately to enable insertion of FDD specific (or common)

[7.68Mcps TDD - …] This tagging indicates that the enclosed text following the "[7.68Mcps TDD - " applies only

to 7.68Mcps TDD. Multiple sequential paragraphs applying only to 7.68Mcps TDD are enclosed

separately to enable insertion of FDD and TDD specific (or common) paragraphs between the

[3.84Mcps TDD - …] This tagging indicates that the enclosed text following the "[3.84Mcps TDD - " applies only

to 3.84Mcps TDD. Multiple sequential paragraphs applying only to 1.28Mcps TDD are enclosed

separately to enable insertion of FDD and TDD specific (or common) paragraphs between the

[1.28Mcps TDD - …] This tagging indicates that the enclosed text following the "[1.28Mcps TDD – " applies

only to 1.28Mcps TDD. Multiple sequential paragraphs applying only to 1.28Mcps TDD are

enclosed separately to enable insertion of FDD and TDD specific (or common) paragraphs

Procedure When referring to a procedure in the specification the Procedure Name is written with the first

letters in each word in upper case characters followed by the word "procedure", e.g. Radio

Message When referring to a message in the specification the MESSAGE NAME is written with all letters

in upper case characters followed by the word "message", e.g. RADIO LINK SETUP REQUEST

Frame When referring to a control or data frame in the specification the CONTROL/DATA FRAME

NAME is written with all letters in upper case characters followed by the words "control/data

The general principles for the specification of the Iub interface are as follows:

- Transmission sharing between the GSM/GPRS Abis interface and the Iub interface shall not be precluded.

- The functional division between RNC and Node B shall have as few options as possible.

- Node B controls a number of cells and can be ordered to add/remove radio links in those cells.

- Neither the physical structure nor any internal protocols of the Node B shall be visible over Iub and are thus not

- Complex functionality shall as far as possible be avoided over Iub. Advanced optimisation solutions may be

- The Iub functional split shall take into account the probability of frequent switching between different channel

- Separation of I interface Radio Network functionality and Transport Network functionality to facilitate