1、 ETSI TS 144 005 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); GSM/EDGE Data Link (DL) Layer; General aspects (3GPP TS 44.005 version 14.0.0 Release 14) TECHNICAL SPECIFICATION GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TS 144 005 V14.0.0 (2017-04)13GPP TS 44.
2、005 version 14.0.0 Release 14Reference RTS/TSGR-0644005ve00 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 lucratif enregistre la Sous-Prfecture de Grasse (06) N
3、 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 present document shall not be modified without the
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6、o 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 authorized by written permission of ETSI. The co
7、ntent 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, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade
8、 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 Association. ETSI ETSI TS 144 005 V14.0.0 (2017-04)
9、23GPP TS 44.005 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 ETSI members and non-members, and can be found i
10、n 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:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy
11、, 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, essential to the present document. Foreword This Techni
12、cal 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 interpreted as being references to the corresponding ETSI
13、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“, “will“, “will not“, “can“ and “cannot“ are to be
14、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 144 005 V14.0.0 (2017-04)33GPP TS 44.005 version 14.0.0 Release 14Contents I
15、ntellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 6g32a Concepts and terminology 7g33 Overview description of LAPDm functions and procedures . 9g33.1 General . 9g33.2 Unacknowledged operation 10g33.3 Acknowledged operation 10g33.4 Informati
16、on transfer mode 11g33.4.1 Information transfer on the BCCH . 11g33.4.2 Information transfer on the PCH + AGCH . 11g33.4.3 Information transfer on the DCCHs 11g33.5 Release of data links . 11g34 Service characteristics 11g34.1 General . 11g34.2 Services provided to layer 3 . 11g34.2.1 General 11g34.
17、2.2 Priority 12g34.2.3 Segmentation 12g34.2.4 Unacknowledged information transfer service . 12g34.2.5 Acknowledged information transfer services . 12g34.2.6 Random access procedure . 14g34.3 Services required from the physical layer 14g34.4 Administrative services 15g34.4.1 General description of ad
18、ministrative services . 15g34.4.2 Definition of primitives for administrative services . 15g35 Overview of data link layer structure . 15g35.1 Functional composition 15g35.2 Identification of data link end points 16g35.3 Data link procedure 16g35.4 Data link distribution procedure . 16g35.5 Random a
19、ccess procedures . 17g36 Specific requirements . 17g36.1 Mode of operation and allowed SAPIs . 17g36.2 Acknowledged mode of operation 18g36.2.1 Window size . 18g36.2.2 Processing capacity . 18g3Annex A (informative): Change History 19g3History 20g3ETSI ETSI TS 144 005 V14.0.0 (2017-04)43GPP TS 44.00
20、5 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (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 t
21、he present document, it will be re-released by the TSG with an identifying change of release date and an increase in version 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 un
22、der change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 144 005 V14.0.0 (2017-04)53GPP TS 44.005 versi
23、on 14.0.0 Release 141 Scope The present document describes in general terms the Link Access Procedures on the Dm channel, LAPDm. The application of this protocol to other channel types is for further study. Details are provided in 3GPP TS 44.006. The purpose of LAPDm is to convey information between
24、 layer 3 entities across the GSM PLMN radio interface (MS to network interface) using the Dm channel. NOTE 1: The term Dm channel is used for convenience to designate the collection of all the various signalling channels required in the GSM system. See also 3GPP TS 44.003. The definition of LAPDm is
25、 based on the principles and terminology of: - ITU-T Recommendations X.200 and X.210: the reference model for Open Systems Interconnection (OSI); - ITU-T Recommendations Q.920 and Q.921: the specification of LAPD for the user-network interface in ISDN; - ITU-T Recommendation X.25 LAPB: user-network
26、interface for packet mode terminals; and - ISO/IEC 3309 and ISO 4335: High-level Data Link Control (HDLC) standards for frame structure and elements of procedures. LAPDm is a protocol that operates at the data link layer of the OSI architecture. The relationship between the data link layer and other
27、 protocol layers is defined below. NOTE 2: The interface between the mobile station and external terminal equipment/terminal adapters is defined in the Technical Specifications of the GSM 07-series. NOTE 3: The physical layer on the radio interface is defined in 3GPP TS 44.004 and layer 3 is defined
28、 in 3GPP TS 24.007, 3GPP TS 44.018, 3GPP TS 24.010 and 3GPP TS 24.011. Reference should be made to these Technical Specifications for the complete definitions of the protocols and procedures across the GSM PLMN radio interface. NOTE 4: The term “data link layer“ is used in the main text of the prese
29、nt document. However, mainly in figures and tables, the terms “layer 2“ and “L2“ are used abbreviations. Furthermore, in accordance with 3GPP TS 24.007 and 3GPP TS 44.018 the term “layer 3“ is used to indicate the layer above the data link layer. LAPDm is independent of the transmission bit rate. It
30、 requires physical channels with characteristics as defined in 3GPP TS 44.003. Clause 2 below describes basic concepts used in the present document and 3GPP TS 44.006. Clause 3 gives an overview description of LAPDm functions and procedures. Clause 4 summarizes the services that the data link layer
31、provides to layer 3 and the services that the data link layer requires from the physical layer. Clause 5 provides an overview of the data link layer structure. ETSI ETSI TS 144 005 V14.0.0 (2017-04)63GPP TS 44.005 version 14.0.0 Release 142 References The following documents contain provisions which
32、, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the la
33、test 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 of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 44.001: “Mo
34、bile Station - Base Station System (MS - BSS) Interface General Aspects and Principles“. 3 3GPP TS 44.003: “Mobile Station - Base Station System (MS - BSS) Interface Channel Structures and Access Capabilities“. 4 3GPP TS 44.004: “Layer 1; General requirements“. 5 3GPP TS 44.006: “Mobile Station - Ba
35、se Station System (MS - BSS) interface Data Link (DL) layer specification“. 6 3GPP TS 24.007: “Mobile radio interface signalling layer 3; General aspects“. 7 3GPP TS 44.018: “Mobile radio interface layer 3 specification; Radio Resource Control Protocol“. 8 3GPP TS 24.010: “Mobile radio interface lay
36、er 3; Supplementary services specification; General aspects“. 9 3GPP TS 24.011: “Point-to-Point (PP) Short Message Service (SMS) support on mobile radio interface“. 10 (void). 11 (void). 12 (void). 13 (void). 14 (void). 15 ITU-T Recommendation X.25: “Interface between Data Terminal Equipment (DTE) a
37、nd Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit“. 16 ITU-T Recommendation X.200: “Information technology - Open Systems Interconnection - Basic Reference Model: The basic model“. 17 ITU-T Recommendation
38、 X.210: “Information technology - Open systems interconnection - Basic Reference Model: Conventions for the definition of OSI services“. 18 ITU-T Recommendation Q.920: “ISDN user-network interface data link layer - General aspects“. 19 ITU-T Recommendation Q.921: “ISDN user-network interface - Data
39、link layer specification“. 20 ISO/IEC 3309: “Information technology - Telecommunications and information exchange between systems - High-level Data Link Control (HDLC) procedures - Frame structure“. 21 ISO/IEC 4335: “Information technology - Telecommunications and information exchange between system
40、s - High-level Data Link Control (HDLC) procedures - Elements of procedures“. ETSI ETSI TS 144 005 V14.0.0 (2017-04)73GPP TS 44.005 version 14.0.0 Release 142a Concepts and terminology The general layering principles used in the present document and other specifications in the 44 series are given in
41、 3GPP TS 44.001. The data link layer is the next to lowest layer of the OSI reference model. The data link layer receives services from the physical layer and provides services to layer 3. The services provided by the data link layer are the combination of the services and functions provided by both
42、 the data link layer and the physical layer. A data link layer Service Access Point (SAP) is the point at which the data link layer provides services to layer 3. The Service Access Point is identified by a Service Access Point Identifier (SAPI). One or more data link connection endpoints can be asso
43、ciated with each data link layer SAP. See figure 1. A data link connection endpoint is identified by a data link connection endpoint identifier (as seen from layer 3) and by a Data Link Connection Identifier DLCI (as seen from the data link layer). SAPIs and DLCIs used by LAPDm are defined in subcla
44、use 5.2. Layer 3 Layer 3entityDatalink layer service access pointDatalink connection endpointDatalinklayerDatalinklayer entity*Figure 1: Entities, service access points and endpoints Co-operation between data link layer entities is governed by a peer-to-peer protocol specific to the layer. For infor
45、mation exchange between two or more layer 3 entities, an association must be established between the layer 3 entities in the data link layer using a data link layer protocol. This association is called a data link connection. Data link connections are provided by the data link layer between two or m
46、ore SAPs (see figure 2). arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1 envelopeback arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1 arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1 envelopeback arro
47、wdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1twelveoclockarrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1 arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1twelveoclockarrowdwnrt1arrowdwnrt1arrowdwnrt1arrowdwnrt1arro
48、wdwnrt1Layer 3entityLayer 3entityDatalink layerservice access pointDatalink connection endpointDatalink relationshipFigure 2: Peer-to-peer relationship Data link layer message units are conveyed between data link layer entities by means of physical connection. ETSI ETSI TS 144 005 V14.0.0 (2017-04)8
49、3GPP TS 44.005 version 14.0.0 Release 14Layer 3 requests services from the data link layer via service primitives. The same applies for the interaction between the data link layer and the physical layer. The primitives represent, in an abstract way, the logical exchange of information and control between the data link layer and its adjacent layers. They do not specify or constrain implementations. The primitives that are exchanged between the data link layer and adjacent layers are of the following f
