1、* ETSI GSM*03-L3 9b _I _ GSM 03.13 March 1996 Version 5.0.0 - Source: ETSI TC-SMG Reference: TS/SMG-O30313Q 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+); Discontinuous Reception (DRX) in the GSM system (GSM 03.13) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=at
3、las, p=etsi, ssecretariat - 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 restriction extend to reproduction in all media. O European Telecommuni
4、cations Standards Institute 1996. All rights reserved. ETSI GSM*03.13 96 3400855 0098377 97T = Page 2 GSM 03.13 Version 5.0.0: March 1996 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 commen
5、ts concerning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown on the title page. ETSI GSM*03.b3 %b U 3400855 0098378 806 W Page 3 GSM 03.13 Version 5.0.0: March 1996 Contents Foreword . 5 1 Scope 7 2 Normative references 7 3 Abbreviations . 7 4 Overview
6、of discontinuous reception . 7 5 MSC functions . 8 6 BSS functions 8 7 MS functions 8 8 Support via the air interface 8 9 Operational aspects 9 History 10 ETSI GSMra03.23 96 U 31100855 0098379 742 W Page 4 GSM 03.13 Version 5.0.0: March 1996 Blank page ETSI GSM*03.13 76 3400855 0078380 464 Page 5 GS
7、M 03.13 Version 5.0.0: March 1996 Foreword This Global System for 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 provides a system wide view of th
8、e operation of discontinuous reception 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 ETS from which this
9、 Phase 2+ GTS has evolved is Phase 2 GSM ETS 300 531 (GSM 03.13 version 4.0.4). 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 become European Telecommunications Standards (ET
10、S). 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 and may change following formal TC-SMG approva
11、l. 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 have been incorporated in the specification;
12、 x the second digit is incremented for all other types of changes, .e. technical enhancements, corrections, updates, etc. NOTE: TC-SMG has produced documents which give the technical specifications for the implementation of the digital cellular telecommunications system. Historically, these document
13、s have been 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
14、 the digital cellular telecommunications system. These version 5.x.x GSM Technical Specifications may be referred to as GTSs. ETSI GS*03.13 96 3400855 0098383 3TO Page 6 GSM 03.1 3 Version 5.0.0: March 1996 Blank page ETSI GSN*:03.13 96 rn 3400855 0098382 237 Page 7 GSM 03.13 Version 5.0.0: March 19
15、96 1 Scope This Technical Specification provides a system wide view of the operation of discontinuous reception on the GSM system. The support of DRX is mandatory in GSM PLMNs. The detailed coding and procedural details are defined in the relevant Technical Specifications dealing with the specific i
16、nterfaces that are involved, for instance GSM 08.08 and GSM 04.08. Reference is also made to the framing on the air interface which is defined in Technical Specification GSM 05.02. The Technical Specification gives an overview of the implementation of discontinuous reception DRX within the GSM syste
17、m, the actions required at MSC, BSS, and MS, the support of the facility via the air interface, and some operational aspects of the facility. 2 Normative references This GTS incorporates by dated and undated reference, provisions from other publications. These normative references are cited at the a
18、ppropriate 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 GTS only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication ref
19、erred to applies. 31 41 151 71 GSM O1 .O4 (ETR 100): “Digital cellular telecommunications system (Phase 2); Abbreviations and acronyms“. GSM 04.08 (prETS 300 557): “Digital cellular telecommunications system (Phase 2); Mobile radio interface layer 3 specification“. GSM 05.02 (prETS 300 574): “Digita
20、l cellular telecommunications system (Phase 2); Multiplexing and multiple access on the radio path“. GSM 08.02 (prETS 300 587-2): “Digital cellular telecommunications system (Phase 2); Base Station System - Mobile-services Switching Centre (BSS - MSC) interface Interface principles“. GSM 08.08 (prET
21、S 300 590): “Digital cellular telecommunications system (Phase 2); Mobile Switching Centre - Base Station System (MSC - BSS) interface Layer 3 specification“. GSM 03.68: “Digital cellular telecommunications system (Phase 2+); Voice Group Call Service (VGCS) Stage 2“. GSM 03.69: “Digital cellular tel
22、ecommunications system (Phase 2+); Voice Broadcast Service (VBS) Stage 2“. 3 Abbreviations Abbreviations used in this specification are listed in GSM 01.04. 4 Overview of discontinuous reception DRX is a technique that allows the mobile station to power down significant amounts of its internal circu
23、itry for a high percentage of the time when it is in the idle mode. It also ensures that the MS is aware of exactly when page requests for it may be transmitted and it can then therefore schedule other tasks such that it avoids the problem of not decoding valid page requests transmitted by the netwo
24、rk in the idle mode periods. The technique works by dividing the MSs within a cell into a set of groups. The group in which an MS resides is then known locally at both the MS and the BSS. All paging requests to each group are then ETSP GSM*Q3.L3 96 3400855 0098L83 173 Page 8 GSM 03.1 3 Version 5.0.0
25、: March 1996 scheduled and sent at a particular time which is derived from the TDMA frame number in conjunction with the IMSI of the MS and some BCCH transmitted data. Thus both the BSS and the MS know when relevant page requests will be sent and the MS can power down for the period when it knows th
26、at page requests will not occur. The page request can contain the IMSI and may contain the TMSI in order to identify the MS concerned. The IMSI is however always used to identify the paging population. Paging by means of the IMEI is for further study. Mechanisms for the application of DRX for the vo
27、ice group call and voice broadcast services are defined in stage 2 descriptions in GSM 03.68 6 and GSM 03.69 7, respectively. 5 MSC functions The MSC is almost transparent to DRX, since it has no real time knowledge of the absolute frame numbers on the air interface (refer to Technical Specification
28、 GSM 08.02). It should be noted, however, that the MSC does define which cells are to be paged in order to locate a particular MS. Normally this will be a location area. The MSC therefore constructs page requests and sends them to a specific set of BSSs. Each page request always includes the IMSI. T
29、he timer to detect non receipt of a page response may require alteration depending upon the number of page groups that are involved. If this is the case, then the timer will be set by O and M command at the same time as the number of paging groups at the cell is altered. 6 BSS functions At the BSS p
30、age requests are received. It is implicit (single cell BSSs) or explicit (multi cell BSSs) within the page requests from the MSC to which cell the page request is destined (Technical Specifications GSM 08.08 and GSM 08.02 refers). The BSS analyses the IMSI in order to derive the page group of the MS
31、 involved. The air interface page request is then constructed and transmitted in the appropriate TDMA burst. If the page request includes a TMSI and IMSI then the IMSI is used to derive the page population and the TMSI is inserted into the .- actual page request message. The scheduling of the page r
32、equests is therefore completely controlled by the BSS. The relationship between paging group and TDMA burst, and IMSI and paging group is given in Technical Specification GSM 05.02. The exact scheduling mechanism used at the BSS is not defined in this Technical Specification. However the BSS may set
33、 the “page mode“ bits as described in Technical Specification GSM 04.08. This can be used to optimise paging load and reduce missed page requests during system reconfiguration. 7 MS functions The MS shall derive its paging group as defined in Technical Specification GSM 05.02. The MS shall interpret
34、 all paging requests in its paging group according to the paging mode bits as described in Technical Specification GSM 04.08. 8 Support via the air interface The BCCH and paging channel messages are defined in Technical Specification GSM 04.08. Technical Specification GSM 05.02 defines the algorithm
35、s which enable an MS to know the exact frame and burst when page requests relevant to it might be transmitted. ETSI GSM*I.a3.13 76 W 3400855 0098184 OOT Page 9 GSM 03.13 Version 5.0.0: March 1996 9 Operational aspects There will be occasions when it is necessary to alter the parameters of cell such
36、that the paging group of the MS may alter. If (referring to Technical Specification GSM 05.02) any of the parameters BS-AG-BLKS-RES, BS-CC-CHANS-COMB, BSCC-CHANS or BS-PA-MFRMS have to be altered, then the period when page requests may be lost can be minimised for example by: Firstly setting the pag
37、e mode to “page reorganisation“ in all page requests on the affected cell for the exact duration of one paging period (Le. BS-PA-MFRMS multiframes). At the completion of this announcement period, the BCCH parameters are set to the new values and the BSS starts scheduling the paging messages accordin
38、g to the new parameters. The page mode is reset to any of the values “normal mode“ or “extended mode“ as required. ETSI GSM*3.L3 96 3400855 0078L85 T46 Page 10 GCM 03.13 Version 50.0: March 1996 February 1996 March 1996 History Creation of Version 5.0.0 (GSM 03.13 version 4.0.4 + CR 03.13-8001) Publication of Version 5.0.0 ISBN 2-7437-0580-9 Dept lgal : Mars 1996
