ETSI GSM 08 54-1995 Digital Cellular Telecommunication System (Phase 2+) Base Station Controller - Base Transceiver Station (BSC - BTS) Interface Layer 1 Structure of Physical Circ_1.pdf

1、GSM 9 3400855 007b7b b3 GSM 08.54 December 1995 Version 5.0.0 Source: ETSI TC-SMG Reference: TS/SMG-O30854Q ICs: 33.060.50 Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM) GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS Digital cellular telecommunications

2、system (Phase 2+); Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 1 structure of physical circuits (GSM 08.54) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des

3、Lucioles - Sophia Antipolic - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariatetsi.fr Tel.: +33 92 94 42 O0 - Fax: +33 93 65 47 16 * Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the foregoing rest

4、riction extend to reproduction in all media. O European Telecommunications Standards Institute 1995. Ail rights reserved. ETSI GSM*O8.54 95 3400855 0079677 575 Page 2 GSM 08.54 Version 5.0.0 December 1995 Whilst every care has been taken in the preparation and publication of this document, errors in

5、 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. ETSI GSM*08.54 95 3400855 0077678 401 Page 3 GSM 08.54 Version 5.0.0 December 1995 Contents Foreword . 5 1

6、 Scope 7 2 Normative references 7 3 Abbreviations . 8 4 Layer 1 specification 8 History 9 ETSI GSfl*OB-SV 95 3400855 0079b79 348 D Page 4 GSM 08.54 Version 5.0.0 December 1995 Blank page ETSI GSN*08.54 95 3400855 0079hO ObT m Page 5 GSM 08.54 Version 5.0.0 December 1995 Foreword This Global System f

7、or Mobile communications 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 structure of the physical layer (layer 1) of the BSC - BTS/TRX interface for support

8、ing traffic channels and control channels within the digital cellular telecommunications system (Phase 2/Phase 2+). This GTS is a TC-SMG approved GSM technical specification version 5, which contains GSM Phase 2+ enhancementdfeatures to the version 4 GSM technical specification. The European Telecom

9、munications Standard from which this Phase 2+ GTS has evolved is Phase 2 GSM ETS 300 594 Edition 2 (GSM 08.54 version 4.1 .O). GTS are produced by TC-SMG to enable the GSM Phase 2+ specifications to become publicly available, prior to submission for the formal ETSI standards approval procedure to be

10、come European Telecommunications Standards (ETS). This ensures the earliest possible access to GSM Phase 2+ specifications for all Manufacturers, Network operators and implementors of the Global System for Mobile communications. The contents of this GTS are subject to continuing work within TC-SMG a

11、nd may change following formal TC-SMG approval. Should TC-SMG modify the contents of this GTS it will 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

12、 have been incorporated in the specif ication; x the second digit is incremented for all other types 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 GT

13、S may not be entirely in accordance with the ETSI rules. Reference is made within this GTS to GSM-TSs (note). NOTE: TC-SMG has produced documents which give the technical specifications for the implementation of the digital cellular telecommunications system. Historically, these documents have been

14、identified as GSM Technical Specifications (GSM-TSs). These TSs may have subsequently become I-ETSs (Phase l), or ETSs/ETSI Technical Reports (ETRs) (Phase 2). TC-SMG has also produced ETSI GSM TSs which give the technical specifications for the implementation of Phase 2+ enhancements of the digital

15、 cellular telecommunications system. These version 5.x.x GSM Technical Specifications may be referred to as GTSs. ETSI GSMx08.54 95 3400855 0077683 TTb Page 6 GSM 08.54 Version 5.0.0 December 1995 Blank page ETSI GSM*08.54 95 = 3400855 0079682 932 Page 7 GSM 08.54 Version 5.0.0 December 1995 1 Scope

16、 The use and general aspects of the A-bis interface are given in Technical Specification GSM 08.51. This Global System for Mobile communications Technical Specification (GTS) defines the structure of the physical layer (layer 1) of the BSC - BTSTTRX interface for supporting traffic channels and cont

17、rol channels. Use of the physical layer for supporting link protocol is covered in Technical Specification GSM 08.56. The physical layer is the lowest layer in the OS1 Reference Model and it-supports all functions required for transmission of bit streams on the physical medium. For this specificatio

18、n only digital transmission will be considered, the use of analogue transmission is a national concern. 2 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

19、publications are 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. I11 I21 131 141 GSM

20、O1 .O4 (ETR 100): “European digital cellular telecommunications system (Phase 2); Abbreviations and acronyms“. 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“.

21、GSM 08.51 (ETS 300 592): “European digital cellular telecommunications system (Phase 2); Base Station Controller - Base Transceiver Station (BSC - BTS) interface General aspects“. GSM 08.56 (ETS 300 595): “European digital cellular telecommunications system (Phase 2); Base Station Controller - Base

22、Transceiver Station (BSC - BTS) interface Layer 2 specification“. GSM 08.60 (ETS 300 597): “European digital cellular telecommunications system (Phase 2); Inband control of remote transcoders and rate adaptors“. GSM 08.61 (ETS 300 598): “European digital cellular telecommunications system (Phase 2);

23、 Inband control of remote transcoders and rate adaptors (half rate)“. CCITT Recommendation G.703: “Physical/electrical characteristics of hierarchical digital interfaces“. CCITT Recommendation G.705: “Characteristics required to terminate digital links on a digital exchange“. CCIlT Recommendation G.

24、711: “Pulse code modulation (PCM) of voice frequencies“. CCITT Recommendation G.732: “Characteristics of primary PCM multiplex equipment operating at 2048 kbis“. CCITT Recommendation 1.460: “Multiplexing, rate adaption and support of existing interfaces“. ETSI GSM*08-54 95 3400855 0079683 877 Page 8

25、 GSM 08.54 Version 5.0.0 December 1995 3 Abbreviations Abbreviations used in this specification are listed in GSM O1 .O4 4 Layer 1 specification All the CCITT recommendations referred to are Blue Book. Layer 1 shall utilize digital transmission at a rate of 2 048 kbisec with a frame structure of 32

26、64 kbiffsec time slots, as specified in CCITT Recommendation G.705 section 3 or at a rate of 64 kbiffsec. The physical/electrical characteristics are defined in CCIT Recommendation G.703. Synchronization at the BTSiTRX for the transmitted bit stream toward the BSC shall be derived from the received

27、bit stream from the BSC. For transmission rate at 64 kbiffsec it shall be an interface as defined in CCITT Recommendation G.703. For transmission rate at 2048 kbiffsec the functional characteristics are defined in CCITT Recommendation G.732 section 2 and 3, and fault conditions should be treated in

28、accordance with CCITT Recommendation G.732 section 4. The idle pattern must be transmitted on every timeslot that is not assigned to a channel, and to every timeslot of a channel that is not allocated to a call. The idle pattern shall be 01010100 for a 64 kbisec channel and the 2-bit pattern O1 for

29、16 kbiffsec channels For 8 kbis channels, the idle pattern shall be consecutive ones or zeros according to the corresponding idle pattern bit of a 16 kbiffs channel. If transcoders are located in BTS speech encoding shall be the A-law as defined in CCITT Recommendation G.711. If speech transcoders a

30、re located in the BSC the speech, data and signalling channels will utilize transmission rates of 8 kbisec, 16 kbisec or 64 kbisec according to Technical Specifications GSM 08.60 and GSM 08.61. They shall be rate adapted or multiplexed according to CCIlT Recommendation 1.460 with fixed format, to fi

31、t into the physical interface. Data encoding is covered in Technical Specification GSM 08.20. In the case of a 2 048 kbiffsec circuit, multidrop solutions should be possible. Dynamic sharing of terrestrial 64 kbiffsec channels between BTS:s on a per-call basis must not be used. Page 9 GSM 08.54 Version 5.0.0 December 1995 November 1995 December 1995 History Creation of Version 5.0.0 (Version 4.1 .O +AR08.54-003) Publication of Version 5.0.0 ISBN 2-7437-0444-6 Dpt lgal : Dcembre 1995