1、IC GSM GSM 08.52 December 1996 Version 5.0.0 Source: ETSI TC-SMG Reference: TS/SMG-O30852Q ICs: 33.020 Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM) GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS Digital cellular telecommunications system; Base Station
2、 Controller - Base Transceiver Station (BSC - BTS) interface; Interface principles (GSM 08.52) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Off ice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
3、X.400: c=fr, a=atlas, p=etsi, ssecretariat - Internet: secretariat etsi.fr Tel.: +33 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 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. O
4、 European Telecommunications Standards Institute 1996. All rights reserved. STD-ETSI GSM 08.52-ENGL L77b 3400855 DL53018 150 Page 2 GSM 08.52 version 5.0.0: December 1996 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwi
5、se, 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. . STD-ETSI GSM 08.52-ENGL L99b 3400855 OL530L7 O97 = Page 3 GSM 08.52 version 5.0.0: December 1996 Contents Foreword . 5 1 Scope 7 1.1 Norma
6、tive references 7 2 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 . 9 4.1 General 9 4.2 Terrestrial
7、 channel management . 10 4.3 Radio channel management 10 SDCCH (Stand alone DCCH) and TCH management 10 4.3.1 4.3.2 Channel configuration 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
8、 channel observation 10 4.3.3 BCCH/CCCH management . 10 4.3.4 Random access 11 4.3.6 Transcodingkate adaption . 11 4.3.7 Timing advance . 11 4.3.8 Radio resource indication 11 4.3.9 Measurements . 11 4.3.1 O LAPDm functions (Layer 2) . 11 4.3.1 1 Paging . 11 4.3.12 Handover . 12 4.3.13 Encryption 12
9、 4.3.1 4 Mobility management and call control . 12 4.3.5 Channel coding/decoding 11 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
10、. 16 6.3 Signalling model . 17 History 20 STD.ETS1 GSM 08.52-ENGL L99b m 3q00855 0353020 809 m Page 4 GSM 08.52 version 5.0.0: December 1996 Blank page STD*ETSI GSM 18.52-ENGL 199b 3LiOD855 0153021 7Li5 Page 5 GSM 08.52 version 5.0.0: December 1996 Foreword This Global System for Mobile communicatio
11、ns Technical Specification (GTS) has been produced by the Special Mobile Group (SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI). This GTS defines the principles basis for the rest of the specifications specifying the interface between the Base Station Cont
12、roller, BSC, and the Base Transceiver Station, BTS, with its transceivers within the digital cellular telecommunications system. The contents of this GTS are subject to continuing work within TC-SMG and may change following formal TC-SMG approval. Should TC-SMG modify the contents of this GTS it wil
13、l then be republished by ETSI with an identifying change of release date and an increase in version number as follows: Version 5.x.y where: y the third digit is incremented when editorial only changes have been incorporated in the specif ication; x the second digit is incremented for all other types
14、 of changes, .e. technical enhancements, corrections, updates, etc. The specification from which this GTS has been derived was originally based on CEPT documentation, hence the presentation of this GTS may not be entirely in accordance with the ETSVPNE rules. - STD-ETSI GSM 08-52-ENGL 277b m 3400855
15、 0353022 b8L m Page 6 GSM 08.52 version 5.0.0: December 1996 Blank page STD-ETSI GSM 08.52-ENGL L99b 3400855 0353023 5L Page 7 GSM 08.52 version 5.0.0: December 1996 1 Scope The use and general aspects of the A-bis interface are given in GSM 08.51. This Global System for Mobile communications Techni
16、cal Specification (GTS) 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 b
17、etween MSC and the BSS is specified in GSM 08.01 to 08.20.) The intention with this interface is to get a unified way of connecting remotely located BTSsTTRXs 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,
18、 BTS contains only those functions which have to reside close to the radio interface. 1.1 Normative references This GTS 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
19、 listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this GTS only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. 131 41 51 71 PI 91 GSM O1 .O4 (ETR 3
20、50): “Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms“. GSM 08.01 : “Digital cellular telecommunications system; Base Station System - Mobile services Switching Centre (BSS - MSC) interface: General aspects“. GSM 08.02: “Digital cellular telecommunications system: B
21、ase Station System - Mobile-services Switching Centre (BSS - MSC) interface; interface principles“. GSM 08.04: “Digital cellular telecommunications system; Base Station System - Mobile-services Switching Centre (BSS - MSC) interface; Layer i specification“. GSM 08.06: “Digital cellular telecommunica
22、tions system: Signalling transport mechanism specification for the Base Station System - Mobile-services Switching Centre (BSS - MSC) interface“. GSM 08.08: “Digital cellular telecommunications system (Phase 2+); Mobile Switching Centre - Base Station System (MSC - BSS) interface; Layer 3 specificat
23、ion“. GSM 08.20: “Digital cellular telecommunications system: Rate adaption on the Base Station System; Mobile-services Switching Centre (BSS - MSC) interface“. GSM 08.51 : “Digital cellular telecommunications system; Base Station Controller - Base Transceiver Station (BSC - BTS) interface; General
24、aspects“. GSM 08.54: “Digital cellular telecommunications system (Phase 2+); Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 1 structure of physical circuits“. GSM 08.56: “Digital cellular telecommunications system; Base Station Controller - Base Transceiver Station (
25、BSC - BTS) interface: Layer 2 specification“. GSM 08.58: “Digital cellular telecommunications system (Phase 2+); Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 3 specification“. Page 8 GSM 08.52 version 5.0.0: December 1996 i 31 GSM 08.60 (ETS 300 737): “Digital cell
26、ular telecommunications system (Phase 2+); Inband control of remote transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels“. GSM 08.61 (ETS 300 979): “Digital cellular telecommunications system; In-band control of remote transcoders and rate adaptors for half rate
27、traffic channels“. GSM 12.21 (ETS 300 623): “Digital cellular telecommunications system (Phase 2); Network Management (NM) procedures and message on the A-bis interface“. 2 Abbreviations Abbreviations used in this specification are listed in GSM O1 .O4 2.1 Base Station System, BSS The system of base
28、 station equipment (transceivers, controllers, etc) which is viewed by the MSC through a single interface as defined by the GSM 08 Ox 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 mor
29、e cells. A BSS may consist of one or more base stations. If an internal interface according to the GSM 08.5 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 GSM 08
30、.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 on
31、e or more TRXs with or without common control equipment. 2.4 Cell See 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 comm
32、on control functions within a BTS, e.g. frequency hopping sequences etc. At a multi BTS site, one of the BCFs can also be chosen to perform functions common to the site (e.g. external alarms, power supply, time base). STD-ETSI GSN 08-52-ENGL 199b 3400855 0353025 390 Page 9 GSM 08.52 version 5.0.0: D
33、ecember 1996 3 General GSM 08.01 to 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 specifi
34、cation 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; - - Figure 3.1 shows some possible configurations. a collection of TRXs where all are served by a common phy
35、sical connection; a collection of TRXs, each served by its own physical connection. BSS A-bis I TRX BCF - TRX - A-bis I TRX - TRX BC F - ?I II MSC BTS1 BTS2 BSC Figure 3.V08.52: BSS Subdivision and Interfaces. A-bis I This specification is based on the use of digital transmission system interfaces,
36、either at 2 048 kbitls or at 64 kbiffs. Furthermore, the use of a subrate of 16 kbiffs and/or 8 kbitls 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 (synchronization) of the t
37、ranscoder is used. 4 Functional division between BSC and BTS 4.1 General In GSM 08.02 the functional division between MSC and BSS is described. This section describes the further subdivision of functions between BSC and BTSTTRX required for the A-bis interface. A summary can be found in table 4.1. S
38、ome general requirements on the functionality of the A-bis interface are also specified. STD-ETSI GSM 08.52-ENGL L77b m 3400855 015302b 227 m Page 10 GSM 08.52 version 5.0.0: December 1996 4.2 Terrestrial channel management There is a unique mapping from traffic channels on the radio path to the ter
39、restrial 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 t
40、o BSC which then controls the use of the radio channels (TDMA time slots for BCCHICCCH, 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
41、 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 bloc
42、ked 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
43、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
44、the downlink and the actual power level used by MS is reported in the corresponding Li-header on the uplink. This header is inserted (downlink) and extracted (uplink) by BTSTTRX. The determination of required power level in MS is based on uplink radio measurements made by BTSTTRX and reported to BSC
45、. The basic control of this power is performed by BSC and the dynamic regulation is performed by BSC or optionally by BTS. If BTS supports dynamic MS power regulation, BSC can indicate whether BTS is to regulate the MS power and if so, also the parameters required by BTS. The required TRX transmissi
46、on power level on a channel is based on reported measurements performed by MS. The dynamic control of this power is optional. If supported, the basic control is performed by BSC and the dynamic regulation is performed by BSC or optionally by BTS. If BTS supports dynamic TRX transmission power regula
47、tion, BSC can indicate whether BTS is to regulate the transmission power and if so, also the parameters required by BTS. 4.3.2.4 Idle channel observation Idle channels are monitored by BTS. 4.3.3 BCCWCCCH management TRX knows the timing of BCCHICCCH slots (not known by BSC). The actual timing of BCC
48、HECCH blocks therefore has to be made by BTSTTRX, including the scheduling of Paging Request messages on paging sub- channels. BCCH information is downloaded to BTS. STD-ETSI GSM O-52-ENGL 277b 3LiOO55 0253027 Lb3 W Page 11 GSM 08.52 version 5.0.0: December 1996 4.3.4 Random access Detection of a ra
49、ndom access attempt has to be made by TRX which then sends a message to BSC containing the required timing advance, the frame number of the access attempt and the 8 bit Channel Request message sent by MS in the access burst. This information is then included by BSC in the following Immediate Assign message sent to MS. 4.3.5 Channel codingdecoding The error protection coding and decoding is made by BTS/TRX. Different coding and interleaving schemes are used for speech and data calls. This information has to be signalled from BSC to BTS on a per ca
