1、 ETSI TS 148 052 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Interface principles (3GPP TS 48.052 version 14.0.0 Release 14) TECHNICAL SPECIFICATION GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRET
2、SI ETSI TS 148 052 V14.0.0 (2017-04)13GPP TS 48.052 version 14.0.0 Release 14Reference RTS/TSGR-0648052ve00 Keywords GSM ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucrat
3、if enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the pre
4、sent document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network d
5、rive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in
6、the present document, please send your comment to one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as
7、authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All rights reserved. DECTTM
8、, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Ass
9、ociation. ETSI ETSI TS 148 052 V14.0.0 (2017-04)23GPP TS 48.052 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for
10、ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:
11、/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essenti
12、al to the present document. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interprete
13、d as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “
14、will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 148 052 V14.0.0 (2017-04)33G
15、PP TS 48.052 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 General . 6g35 Functional division between BSC and BTS . 7
16、g35.1 General . 7g35.2 Terrestrial channel management . 7g35.3 Radio channel management 7g35.3.1 Channel configuration management . 7g35.3.2 SDCCH (Stand alone DCCH) and TCH management 8g35.3.2.1 Frequency hopping management 8g35.3.2.2 Channel selection, link supervision and channel release . 8g35.3
17、.2.3 Power control 8g35.3.2.4 Idle channel observation . 8g35.3.3 BCCH/CCCH management 8g35.3.4 Random access 8g35.3.5 Channel coding/decoding . 8g35.3.6 Transcoding/rate adaption. 9g35.3.7 Timing advance 9g35.3.8 Radio resource indication . 9g35.3.9 Measurements . 9g35.3.10 LAPDm functions (Layer 2
18、) . 9g35.3.11 Paging . 9g35.3.12 Handover 9g35.3.13 Encryption. 10g35.3.14 Mobility management and call control . 10g36 Transcoding/rate adaption and multiplexing 11g36.1 Transcoding/rate adaption in BTS 11g36.2 Transcoding/rate adaption outside BTS . 11g37 Interface structures . 12g37.1 Communicati
19、on channels . 12g37.2 Signalling links . 12g37.3 Signalling model 13g3Annex A (informative): Change History 17g3History 18g3ETSI ETSI TS 148 052 V14.0.0 (2017-04)43GPP TS 48.052 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project
20、(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 identifying change of release date and an increase in version
21、 number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections
22、, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 148 052 V14.0.0 (2017-04)53GPP TS 48.052 version 14.0.0 Release 141 Scope The use and general aspects of the A-bis interface are given in 3GPP TS 48.051. The present docu
23、ment 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
24、is specified in 3GPP TS 48.001 and 3GPP TS 48.020). 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 con
25、tains only those functions which have to recide close to the radio interface. 2 References 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 numbe
26、r, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply. 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
27、of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 48.001: “Base Station System - Mobile services Switching Centre (BSS - MSC) interface; General aspects“. 3 3GPP TS 48.002: “Base Station System - Mobile-services Switching
28、Centre (BSS - MSC) interface Interface principles“. 4 Void. 5 3GPP TS 48.006: “Signalling transport mechanism specification for the Base Station System - Mobile-services Switching Centre (BSS-MSC) interface“. 6 Void. 7 3GPP TS 48.020: “Rate adaption on the Base Station System - Mobile-services Switc
29、hing Centre (BSS-MSC) interface“. 8 3GPP TS 48.051: “Base Station Controller - Base Transceiver Station (BSC-BTS) interface; General aspects“. 9 3GPP TS 48.058: “Base Station Controller - Base Transceiver Station (BSC-BTS) interface; Layer 3 specification“. 10 3GPP TS 48.060: “Inband control of remo
30、te transcoders and rate adaptors for full rate traffic channels“. 11 3GPP TS 48.061: “Inband control of remote transcoders and rate adaptors for half rate traffic channels“. 12 Void. 13 3GPP TS 23.002: “Network Architecture“. ETSI ETSI TS 148 052 V14.0.0 (2017-04)63GPP TS 48.052 version 14.0.0 Relea
31、se 143 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Base Station System (BSS): system of base station equipment (transceivers, controllers, etc) which is viewed by the MSC through a single interface as defined by t
32、he 3GPP TS 48.0xx 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 3GPP TS 48.05x se
33、ries at recommendations is implemented, then the BSS shall consist of one Base Station Controller (BSC) and several Base Transceiver Stations (BTSs). NOTE: The functionality is described in 3GPP TS 48.001. Base Station Controller (BSC): network component in the PLMN with the functions for control of
34、 one or more Base Transceiver Stations (BTSs). Base Transceiver Station (BTS): 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. Cell: See 3GPP TS 23.002. Transceiver (TRX): in th
35、e GSM PLMN is the functional entity which supports the 8 basic radio channels of the same TDMA-frame. Base Control Function (BCF): functional entity which handles common control functions within a BTS, e.g. frequency hopping sequences etc. At a multi BTS site, one of the BCFs can also be choosen to
36、perform functions common to the site (e.g. external alarms, power supply, time base). 3.2 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 apply. 4 General 3GPP TS 48.001 and 3GPP TS 48.020 specify the functional split and interface between MSC and th
37、e 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 the present document is the interface between a BSC and a BTS. It is denoted the A-bis-interface. The A-bis-interfa
38、ce 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. ETSI ETSI TS 148 052 V14.0.0 (2017-04)73GPP TS 48.052 version 14
39、.0.0 Release 14Figure 4.1 shows some possible configurations. BSS | +-+ A-bis +-+ | +-| TRX | BTS1 | | | + - - | | | | BCF | | | | +-+ | | +-+ | | | | TRX | | | A-bis + - - | | | +-| TRX | BTS2 | | + - - | | | | | TRX | | | + - - | | | | | BCF | | | +-+ +-+ A | | | +- - -+ | MSC +-| BSC | A-bis |+-+
40、| +-+ | | +-|TRX| | | |+-+| | | | |+-+| | +-|TRX| | | | |+-+| BTS3 | | |+-+| | | +-|TRX| | | |+-+| | | | |+-+| | +-|BCF| | | | |+-+| +-+ +- - + Figure 4.1: BSS Subdivision and Interfaces The present document is based on the use of digital transmission system interfaces, either at 2 048 kbit/s or at
41、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. 5 Function
42、al division between BSC and BTS 5.1 General In Technical Specification 3GPP TS 48.001 the functional division between MSC and BSS is described. This clause describes the further subdivision of functions between BSC and BTS/TRX required for the A-bis interface. A summary can be found in table 5.1. So
43、me general requirements on the functionality of the A-bis interface are also specified. 5.2 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
44、channel for a call. 5.3 Radio channel management 5.3.1 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
45、etc). ETSI ETSI TS 148 052 V14.0.0 (2017-04)83GPP TS 48.052 version 14.0.0 Release 145.3.2 SDCCH (Stand alone DCCH) and TCH management 5.3.2.1 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 i
46、nformation to each BTS and also to send the corresponding BCCH information to be transmitted in the BCCH time slots. 5.3.2.2 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
47、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 infor
48、med 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. 5.3.2.3 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)
