ETSI ETS 300 593 ed.2 (1995-07)

European digital cellular telecommunications system (Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Interface principles (GSM 08.52)

RE/SMG-030852P

Evropski digitalni celični telekomunikacijski sistem (faza 2) – Vmesnik med krmilnikom bazne postaje in bazno sprejemno-oddajno postajo (BSC-BTS) – Načela za vmesnik (GSM 08.52)

General Information

• Status: Published
• Publication Date: 31-Jul-1995
• Technical Committee: SMG 3 - Network Aspects
• Current Stage: 12 - Completion
• Due Date: 26-Jul-1995
• Completion Date: 01-Aug-1995
• Ref Project: SIST ETS 300 593 E2:2003 - European digital cellular telecommunications system (Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Interface principles (GSM 08.52)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 593 E2:2003
01-december-2003
(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±9PHVQLNPHG
NUPLOQLNRPED]QHSRVWDMHLQED]QRVSUHMHPQRRGGDMQRSRVWDMR%6&%76±
1DþHOD]DYPHVQLN*60
European digital cellular telecommunications system (Phase 2); Base Station Controller -
Base Transceiver Station (BSC - BTS) interface; Interface principles (GSM 08.52)
Ta slovenski standard je istoveten z: ETS 300 593 Edition 2
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 593 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ETS 300 593 E2:2003

---------------------- Page: 2 ----------------------

SIST ETS 300 593 E2:2003
EUROPEAN ETS 300 593
TELECOMMUNICATION July 1995
STANDARD Second Edition
Source: ETSI TC-SMG Reference: DE/SMG-030852P
ICS: 33.060.30
European digital cellular telecommunications system, Global System for Mobile communications
Key words:
(GSM)
European digital cellular telecommunications system (Phase 2);
Base Station Controller - Base Transceiver Station
(BSC - BTS) interface
Interface principles
(GSM 08.52)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute . All rights reserved.
1995
New presentation - see History box

---------------------- Page: 3 ----------------------

SIST ETS 300 593 E2:2003
Page 2
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

---------------------- Page: 4 ----------------------

SIST ETS 300 593 E2:2003
Page 3
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
Contents
Foreword.5
1 Introduction. 7
1.1 Scope .7
1.2 Normative references .7
2 Definitions and abbreviations.8
2.1 Base Station System, BSS .8
2.2 Base Station Controller, BSC. 8
2.3 Base Transceiver Station, BTS.8
2.4 Cell.8
2.5 Transceiver, TRX .8
2.6 Base Control Function, BCF.8
3 General .9
4 Functional division between BSC and BTS. 10
4.1 General. 10
4.2 Terrestrial channel management. 10
4.3 Radio channel management . 10
4.3.1 Channel configuration management. 10
4.3.2 SDCCH (Stand alone DCCH) and TCH management. 10
4.3.2.1 Frequency hopping management. 10
4.3.2.2 Channel selection, link supervision and channel release. 10
4.3.2.3 Power control. 10
4.3.2.4 Idle channel observation. 11
4.3.3 BCCH/CCCH management. 11
4.3.4 Random access . 11
4.3.5 Channel coding/decoding . 11
4.3.6 Transcoding/rate adaption. 11
4.3.7 Timing advance . 11
4.3.8 Radio resource indication. 11
4.3.9 Measurements. 11
4.3.10 LAPDm functions (Layer 2) . 12
4.3.11 Paging. 12
4.3.12 Handover. 12
4.3.13 Encryption . 12
4.3.14 Mobility management and call control. 12
5 Transcoding/rate adaption and multiplexing. 15
5.1 Transcoding/rate adaption in BTS. 15
5.2 Transcoding/rate adaption outside BTS. 15
6 Interface structures . 15
6.1 Communication channels. 15
6.2 Signalling links. 16
6.3 Signalling model. 17
History. 20

---------------------- Page: 5 ----------------------

SIST ETS 300 593 E2:2003
Page 4
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
Blank page

---------------------- Page: 6 ----------------------

SIST ETS 300 593 E2:2003
Page 5
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI).
This ETS defines the interface principles of the Base Station Controller (BSS) to Base Transceiver Station
(BTS) interface. This ETS corresponds to GSM technical specification GSM 08.52 version 4.1.0.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI/PNE rules.
Reference is made within this ETS to GSM-TSs (NOTE).
NOTE: TC-SMG has produced documents which give the technical specifications for the
implementation of the European digital cellular telecommunications system. Historically,
these documents have been identified as GSM Technical Specifications (GSM-TSs).
These TSs may have subsequently become I-ETSs (Phase 1), or ETSs (Phase 2),
whilst others may become ETSI Technical Reports (ETRs). GSM-TSs are, for editorial
reasons, still referred to in GSM ETSs.
Proposed transposition dates
Date of adoption of this ETS: 30 July 1995
Date of latest announcement of this ETS (doa): 31 October 1995
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 April 1996
Date of withdrawal of any conflicting National Standard (dow): 30 April 1995

---------------------- Page: 7 ----------------------

SIST ETS 300 593 E2:2003
Page 6
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
Blank page

---------------------- Page: 8 ----------------------

SIST ETS 300 593 E2:2003
Page 7
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
1 Introduction
1.1 Scope
The use and general aspects of the A-bis interface are given in Technical Specification GSM 08.51.
This specification gives the principle basis for the rest of the specifications specifying the interface
between the Base Station Controller, BSC, and the Base Transceiver Station, BTS, with its transceivers,
TRX. These components together form the Base Station System, BSS. (The interface between MSC and
the BSS is specified in Technical Specifications GSM 08.01 - 08.20.)
The intention with this interface is to get a unified way of connecting remotely located BTSs/TRXs to a
BSC allowing for the interconnection of BSCs and BTSs/TRXs from different manufacturers.
In order to keep the BTS as simple as possible, BTS contains only those functions which have to recide
close to the radio interface.
1.2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply
to this ETS only when incorporated in it by amendment or revision. For undated references, the latest
edition of the publication referred to applies.
[1] GSM 01.04 (ETR 100): "European digital cellular telecommunications system
(Phase 2); Abbreviations and acronyms".
[2] GSM 08.01 (ETS 300 587-1): "European digital cellular telecommunications
system (Phase 2); Base Station System - Mobile services Switching Centre
(BSS - MSC) interface General aspects".
[3] GSM 08.02 (ETS 300 587-2): "European digital cellular telecommunications
system (Phase 2); Base Station System - Mobile-services Switching Centre
(BSS - MSC) interface Interface principles".
[4] GSM 08.04 (ETS 300 588): "European digital cellular telecommunications
system (Phase 1); Base Station System - Mobile-services Switching Centre
(BSS - MSC) interface Layer 1 specification".
[5] GSM 08.06 (ETS 300 589): "European digital cellular telecommunications
system (Phase 2); Signalling transport mechanism specification for the Base
Station System - Mobile-services Switching Centre (BSS - MSC) interface".
[6] GSM 08.08 (ETS 300 590): "European digital cellular telecommunications
system (Phase 2); Mobile Switching Centre - Base Station System (MSC - BSS)
interface Layer 3 specification".
[7] GSM 08.20 (ETS 300 591): "European digital cellular telecommunications
system (Phase 2); Rate adaption on the Base Station System - Mobile-services
Switching Centre (BSS - MSC) interface".
[8] GSM 08.51 (ETS 300 592): "European digital cellular telecommunications
system (Phase 2); Base Station Controller - Base Transceiver Station (BSC -
BTS) interface General aspects".
[9] GSM 08.58 (ETS 300 596): "European digital cellular telecommunications
system (Phase 2); Base Station Controller - Base Transceiver Station (BSC -
BTS) interface Layer 3 specification".

---------------------- Page: 9 ----------------------

SIST ETS 300 593 E2:2003
Page 8
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
[10] GSM 08.60 (ETS 300 597): "European digital cellular telecommunications
system (Phase 2); Inband control of remote transcoders and rate adaptors".
[11] GSM 08.61 (ETS 300 598): "European digital cellular telecommunications
system (Phase 2); Inband control of remote transcoders and rate adaptors (half
rate)".
[12] GSM 12.21 (ETS 300 623): "European digital cellular telecommunications
system (Phase 2); Network Management (NM) procedures and message on the
A-bis interface".
2 Definitions and abbreviations
Abbreviations used in this specification are listed in GSM 01.04
2.1 Base Station System, BSS
The system of base station equipment (transceivers, controllers, etc.) which is viewed by the MSC
through a single interface as defined by the GSM 08 0x series of recommendations, as being the entity
responsible for communicating with Mobile Stations in a certain area. The radio equipment of a BSS may
cover one or more cells. A BSS may consist of one or more base stations. If an internal interface
according to the GSM 08.5x series at recommendations is implemented, then the BSS shall consist of one
Base Station Controller (BSC) and several Base Transceiver Stations (BTSs).
The functionality is described in Recommendation GSM 08.02.
2.2 Base Station Controller, BSC
A network component in the PLMN with the functions for control of one or more Base Transceiver Stations
(BTSs).
2.3 Base Transceiver Station, BTS
A network component which serves one cell, and is controlled by a Base Station Controller. The BTS can
consist of one or more TRXs with or without common control equipment.
2.4 Cell
See TS GSM 03.02.
2.5 Transceiver, TRX
The Transceiver, TRX, in the GSM PLMN is the functional entity which supports the 8 basic radio channels
of the same TDMA-frame.
2.6 Base Control Function, BCF
A functional entity which handles common control functions within a BTS, e.g. frequency hopping
sequencies etc.
At a multi BTS site, one of the BCFs can also be choosen to perform functions common to the site (e.g.
external alarms, power supply, time base).

---------------------- Page: 10 ----------------------

SIST ETS 300 593 E2:2003
Page 9
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
3 General
Technical Specifications GSM 08.01 - 08.20 specify the functional split and interface between MSC and
the Base Station System, BSS, the A- interface.
The BSS can be further subdivided into one BSC controlling one or more BTSs, each consisting of one or
more TRXs. The interface treated by this specification is the interface between a BSC and a BTS. It is
denoted the A-bis-interface.
The A-bis-interface is capable of supporting three different internal BTS configurations:
- one single TRX,
- a collection of TRXs where all are served by a common physical connection,
- a collection of TRXs, each served by its own physical connection.
Figure 3.1 shows some possible configurations.
                    BSS
         <˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜>
         ‡    �˜˜˜˜˜¿   A-bis   �˜˜˜˜˜¿
              ‡   ˆ˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜· TRX ‡ BTS1
         ‡    ‡   ‡        ˆ ˜ ˜ ·
              ‡   ‡        ‡ BCF ‡
         ‡    ‡   ‡        �˜˜˜˜˜�
              ‡   ‡        �˜˜˜˜˜¿
         ‡    ‡   ‡        ‡ TRX ‡
              ‡   ‡   A-bis   ˆ ˜ ˜ ·
         ‡    ‡   ˆ˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜· TRX ‡ BTS2
              ‡   ‡        ˆ ˜ ˜ ·
         ‡    ‡   ‡        ‡ TRX ‡
              ‡   ‡        ˆ ˜ ˜ ·
         ‡    ‡   ‡        ‡ BCF ‡
              ‡   ‡        �˜˜˜˜˜�
�˜˜˜˜˜¿    A ‡    ‡   ‡        �˜ ˜ ˜¿
‡ MSC ˆ˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜· BSC ‡   A-bis   ‡�˜˜˜¿‡
�˜˜˜˜˜�      ‡    ‡   ˆ˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜·TRX‡
              ‡   ‡        ‡�˜˜˜�‡
         ‡    ‡   ‡        ‡�˜˜˜¿‡
              ‡   ˆ˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜·TRX‡
         ‡    ‡   ‡        ‡�˜˜˜�‡ BTS3
              ‡   ‡        ‡�˜˜˜¿‡
         ‡    ‡   ˆ˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜·TRX‡
              ‡   ‡        ‡�˜˜˜�‡
         ‡    ‡   ‡        ‡�˜˜˜¿‡
              ‡   ˆ˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜·BCF‡
         ‡    ‡   ‡        ‡�˜˜˜�‡
              �˜˜˜˜˜�        �˜˜ ˜ �
Figure 3.1/08.52: BSS Subdivision and Interfaces.
This specification is based on the use of digital transmission system interfaces, either at 2048 kbit/s or at
64 kbit/s. Furthermore, the use of a subrate of 16 kbit/s and/or 8 kbit/s is supported for coded speech or
rate adapted data.
This interface will support the transcoder positioned either inside or outside BTS. In the latter case, remote
control (synchronisation) of the transcoder is used.

---------------------- Page: 11 ----------------------

SIST ETS 300 593 E2:2003
Page 10
ETS 300 593: July 1995 (GSM 08.52 version 4.1.0)
4 Functional division between BSC and BTS
4.1 General
In Technical Specification GSM 08.02 the functional division between MSC and BSS is described. This
section describes the further subdivision of functions between BSC and BTS/TRX required for the A-bis
interface. A summary can be found in table 4.1. Some general requirements on the functionality of the A-
bis interface are also specified.
4.2 Terrestrial channel management
There is a unique mapping from traffic channels on the radio path to the terrestrial traffic channels. BSC
makes the choice of radio channel and thereby also of the terrestrial channel for a call.
4.3 Radio channel management
4.3.1 Channel configuration management
The channel configuration is controlled between the BSC and OMC. Current configuration is downloaded
from OMC to BSC which then controls the use of the radio channels (TDMA time slots for BCCH/CCCH,
TCHs, SDCCHs etc).
4.3.2 SDCCH (Stand alone DCCH) and TCH management
4.3.2.1 Frequency hopping management
The hopping sequences for each BTS (cell) is downloaded from OMC to BSC. It is then the responsibility
of BSC to download this information to each BTS and also to send the corresponding BCCH information to
be transmitted in the BCCH time slots.
4.3.2.2 Channel selection, link supervision and channel release
These functions are controlled by BSC. For channel selection BSC has to have information on blocked
radio channels and also on interference level on idle channels.
In the assignment messages to MS (Immediate Assign, Assign Command and Handover Command), a
Starting Time parameter is included. This starting time is based on the frame number on the (new) BTS.
Before sending the assign message to MS, BSC has to be informed on the current frame number in BTS.
When assigning a channel, BSC shall inform BTS on relevant parameters, e.g. channel type, channel
coding, rate adaption, starting time.
4.3.2.3 Power control
The ordered MS power level is sent in the 16 bit L1-header of SACCH- blocks on the downlink and the
actual power level used by MS is reported in the corresponding L1-header on the uplink. This header is
inserted (downlink) and extracted (uplink) by BTS/TRX.
The determination of required power level in MS is based on uplink radio m
...