ETSI ETS 300 938 ed.4 (1999-12)

Digital cellular telecommunications system (Phase 2+) (GSM); Mobile Station - Base Station System (MS - BSS) interface; Data Link (DL) layer specification (GSM 04.06 version 5.3.1 Release 1996)

RE/SMG-030406QR2

Digitalni celični telekomunikacijski sistem (faza 2+) – Mobilna postaja – Vmesnik sistema bazne postaje (MS-BSS) – Specifikacija podatkovne povezovalne plasti (GSM 04.06, različica 5.3.1, izdaja 1996)

General Information

• Status: Published
• Publication Date: 21-Dec-1999
• Technical Committee: SMG 3 - Network Aspects
• Current Stage: 12 - Completion
• Due Date: 03-Dec-1999
• Completion Date: 22-Dec-1999
• Ref Project: SIST ETS 300 938 E4:2003 - Digital cellular telecommunications system (Phase 2+) (GSM); Mobile Station - Base Station System (MS - BSS) interface; Data Link (DL) layer specification (GSM 04.06 version 5.3.1 Release 1996)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 938 E4:2003
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHPID]D±0RELOQDSRVWDMD±9PHVQLN
VLVWHPDED]QHSRVWDMH06%66±6SHFLILNDFLMDSRGDWNRYQHSRYH]RYDOQHSODVWL
*60UD]OLþLFDL]GDMD
Digital cellular telecommunications system (Phase 2+) (GSM); Mobile Station - Base
Station System (MS - BSS) interface; Data Link (DL) layer specification (GSM 04.06
version 5.3.1 Release 1996)
Ta slovenski standard je istoveten z: ETS 300 938 Edition 4
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST ETS 300 938 E4:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 938 E4:2003

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SIST ETS 300 938 E4:2003
EUROPEAN ETS 300 938
TELECOMMUNICATION December 1999
STANDARD Fourth Edition
Source: SMG Reference: RE/SMG-030406QR2
ICS: 33.020
Key words: Digital cellular telecommunications system, Global System for Mobile communications (GSM)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
Digital cellular telecommunications system (Phase 2+);
Mobile Station - Base Station System (MS - BSS) interface;
Data Link (DL) layer specification
(GSM 04.06 version 5.3.1 Release 1996)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: [e-mail] - http://www.etsi.org
Tel.:[phone]- Fax:[phone]
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.
© European Telecommunications Standards Institute 1999. All rights reserved.

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ETS 300 938 (GSM 04.06 version 5.3.1 Release 1996): December 1999
Whilst every care has been taken in the preparation and publication of the present document, errors in
content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please
write to "ETSI Standards Making Support Dept." at the address shown on the title page.

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ETS 300 938 (GSM 04.06 version 5.3.1 Release 1996): December 1999
Contents
Intellectual Property Rights.7
Foreword.7
0 Scope .9
0.1 Normative references.9
0.2 Abbreviations .9
1 General.10
1.1 Options.10
2 Frame structure for peer-to-peer communication .11
2.1 General .11
2.2 Frame delimitation and fill bits .13
2.3 Address field .14
2.4 Control field.14
2.5 Length indicator field.14
2.5a Short L2 header type 1.14
2.6 Information field .14
2.7 Transparency.14
2.8 Format convention .14
2.8.1 Numbering convention.14
2.8.2 Order of bit transmission .15
2.8.3 Field mapping convention.15
3 Elements of procedures and formats of fields for Data Link Layer peer-to-peer communication.15
3.1 General .15
3.2 Address field format.15
3.3 Address field variables.16
3.3.1 Address field extension bit (EA) .16
3.3.2 Command/response field bit (C/R).16
3.3.3 Service access point identifier (SAPI) .16
3.4 Control field formats.17
3.4.1 Information transfer format - I.17
3.4.2 Supervisory format - S.17
3.4.3 Unnumbered format - U.17
3.4a Short L2 header type 1.18
3.5 Control field parameters and associated state variables .18
3.5.1 Poll/Final bit .18
3.5.2 Multiple frame operation - variables and sequence numbers.18
3.5.2.1 Modulus .18
3.5.2.2 Send state variable V(S).18
3.5.2.3 Acknowledge state variable V(A).18
3.5.2.4 Send sequence number N(S) .19
3.5.2.5 Receive state variable V(R) .19
3.5.2.6 Receive sequence number N(R) .19
3.5.2.7 Other parameters and variables .19
3.5.3 Unacknowledged operation variables and parameters .19
3.6 Length indicator field format.19
3.7 Length indicator field variables.20
3.7.1 Length indicator field extension bit (EL) .20
3.7.2 More data bit (M) .20
3.7.3 Length indicator (L).20
3.8 Commands and responses.20
3.8.1 Information (I) commands .20
3.8.2 Set asynchronous balanced mode (SABM) command.21
3.8.3 Disconnect (DISC) command.22

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3.8.4 Unnumbered information (UI) command . 22
3.8.5 Receive ready (RR) command/response. 22
3.8.6 Reject (REJ) command/response. 23
3.8.7 Receive not ready (RNR) command/response. 23
3.8.8 Unnumbered acknowledgement (UA) response. 23
3.8.9 Disconnected mode (DM) response . 23
4 Elements for layer-to-layer communication . 24
4.1 Definition of primitives and parameters. 24
4.1.1 Generic names . 24
4.1.1.1 DL-ESTABLISH. 24
4.1.1.2 DL-RELEASE. 24
4.1.1.3 DL-DATA. 24
4.1.1.4 DL-UNIT DATA . 24
4.1.1.5 DL-SUSPEND . 24
4.1.1.6 DL-RESUME . 24
4.1.1.7 DL-RECONNECT. 25
4.1.1.8 DL-RANDOM ACCESS. 25
4.1.1.9 MDL-RELEASE. 25
4.1.1.10 MDL-ERROR . 25
4.1.1.11 PH-DATA . 25
4.1.1.12 PH-RANDOM ACCESS . 25
4.1.1.13 PH-CONNECT . 25
4.1.1.14 PH-READY-TO-SEND . 25
4.1.1.15 PH-EMPTY-FRAME. 25
4.1.2 Primitives types. 25
4.1.2.1 REQUEST. 25
4.1.2.2 INDICATION . 26
4.1.2.3 RESPONSE . 26
4.1.2.4 CONFIRM . 26
4.1.3 Parameter definition. 26
4.1.3.1 Message unit. 26
4.1.3.2 Channel type . 27
4.1.3.3 Service Access Point . 27
4.1.3.4 Release mode. 27
4.1.3.5 Error cause. 27
4.1.3.6 Establish mode. 27
4.1.3.7 L2 header type . 27
4.2 Primitive procedures.31
5 Definition of the peer-to-peer protocol LAPDm. 32
5.1 General. 32
5.2 General Protocol Procedures . 33
5.2.1 Unacknowledged information transfer . 33
5.2.2 Acknowledged multiple frame information transfer. 33
5.3 Procedures for unacknowledged information transfer. 33
5.3.1 General . 33
5.3.2 Transmission of unacknowledged information . 33
5.3.3 Receipt of unacknowledged information. 33
5.4 Procedures for establishment and release of multiple frame operation. 34
5.4.1 Establishment of multiple frame operation . 34
5.4.1.1 General . 34
5.4.1.2 Normal establishment procedures . 34
5.4.1.3 Procedure on expiry of timer T200: Normal establishment. 35
5.4.1.4 Contention resolution establishment procedure. 35
5.4.1.5 Procedure on expiry of timer T200: contention resolution
(MS only). 37
5.4.2 Information transfer. 37
5.4.2.1 General requirements . 37
5.4.2.2 Error conditions . 38
5.4.2.3 Fill frames. 39
5.4.3 Suspension and resumption of multiple frame operation . 39
5.4.3.1 General . 39

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5.4.3.2 Suspension .40
5.4.3.3 Resumption.40
5.4.3.3.1 Procedure after channel change.40
5.4.3.3.2 Procedure after returning to the old
channel (MS only) .41
5.4.4 Termination of multiple frame operation.42
5.4.4.1 General .42
5.4.4.2 Normal release procedure .42
5.4.4.3 Procedure on expiry of timer T200 for normal release .42
5.4.4.4 Local end release procedure .43
5.4.5 Idle state.43
5.4.6 Collision of unnumbered commands and responses .43
5.4.6.1 Identical transmitted and received commands .43
5.4.6.2 Different transmitted and received commands.44
5.4.6.3 Unsolicited DM response and SABM or DISC command.44
5.5 Procedures for information transfer in multiple frame operation.44
5.5.1 Transmitting I frames .44
5.5.2 Receiving I frames.45
5.5.2.1 P bit of the received I frame set to "1" .45
5.5.2.2 P bit of the received I frame set to "0" .45
5.5.3 Receiving acknowledgement.45
5.5.3.1 On receipt of a valid I frame.45
5.5.3.2 Receiving supervisory command frames with the P bit set
to "1" .46
5.5.4 Receiving REJ frames.46
5.5.4.1 Receipt of a valid REJ frame .46
5.5.4.2 Transmitting frames.47
5.5.5 Receiving RNR frame.47
5.5.6 Data link layer own receiver busy condition.49
5.5.7 Waiting acknowledgement .49
5.6 Abnormal release and re-establishment of multiple frame operation .50
5.6.1 Criteria for re-establishment.50
5.6.2 Criteria for abnormal release.50
5.6.3 Procedures for re-establishment .50
5.6.4 Procedures for abnormal release.50
5.7 Exception condition reporting and recovery for multiple frame operation.51
5.7.1 N(S) sequence error.51
5.7.2 Timer recovery.51
5.7.3 Invalid frame condition.52
5.7.4 N(R) sequence error.52
5.8 List of system parameters.52
5.8.1 Timer T200.52
5.8.1.1 For SAPI=0 and SAPI=3.52
5.8.1.2 For SAPIs other than 0 or 3 .53
5.8.2 Maximum number of retransmissions (N200) .53
5.8.2.1 For SAPI=0 and 3 .53
5.8.2.2 For SAPIs other than 0 or 3 .53
5.8.3 Maximum number of octets in an I, UI, SABM and UA frame partially or
entirely available for the information field (N201) .53
5.8.4 Maximum number of outstanding I frames (k) .53
5.8.5 Maximum number of octets in a Layer 3 message .54
5.9 System performance requirements.54
6 Special protocol operation on SAPI=0 and SAPI=3 .55
Annex A (normative): Random access procedures.56
A.1 Description of the procedure .56
A.1.1 Procedure in the MS .56
A.1.2 Procedure in the BS.56
A.2 Format .56

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Annex G (normative): Handling of frames with parameter errors in the address, control and length
indicator fields . 57
G.1 General . 57
G.2 Parameter errors in the address field . 57
G.2.1 Unallocated SAPI . 57
G.2.2 Wrong value of the C/R bit . 57
G.2.3 EA bit set to "0". 57
G.3 Parameter errors in the control field . 57
G.3.1 Supervisory frames . 57
G.3.2 Unnumbered frames . 58
G.4 Parameter errors in the length indicator field. 58
G.4.1 EL bit error. 58
G.4.2 Information frames . 58
G.4.3 Supervisory frames . 58
G.4.4 DISC and DM frames . 58
G.4.5 SABM UA and UI frames. 58
Annex H (informative): Document change history . 59
History. 60

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Intellectual 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 in 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 (http://www.etsi.org/ipr).
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 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 European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) of the European Telecommunications Standards Institute (ETSI).
This ETS defines the data link layer protocol of the Mobile Station - Base Station System (MS - BSS)
interface within the digital cellular telecommunications system.
The contents of this ETS is subject to continuing work within SMG and may change following formal SMG
approval. Should SMG modify the contents of this ETS, it will be resubmitted for OAP by ETSI with an
identifying change of release date and an increase in version number as follows:
Version 5.x.y
where:
5 Indicates GSM Phase 2+
y the third digit is incremented when editorial only changes have been incorporated in the
specification;
x the second digit is incremented for all other types of changes, i.e. technical enhancements,
corrections, updates, etc.
The specification from which this ETS has been derived was originally based on CEPT documentation,
hence the presentation of this ETS may not be entirely in accordance with the ETSI drafting rules.
Annexes B to F were deleted from the original specification, however, for referencing purposes the annex
numbering has been maintained.
Transposition dates
Date of adoption of this ETS: 03 December 1999
Date of latest announcement of this ETS (doa): 31 March 2000
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 September 2000
Date of withdrawal of any conflicting National Standard (dow): 30 September 2000

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0 Scope
This European Telecommunication Standard (ETS) defines a data link layer protocol to be used for
signalling, and possibly also for other applications, on the MS-BS interface.
0.1 Normative references
This ETS 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 listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references, the
latest edition of the publication referred to applies.
[1] GSM 01.04 (ETR 350): "Digital cellular telecommunications system (Phase 2+);
Abbreviations and acronyms".
[2] GSM 04.01: "Digital cellular telecommunications system; Mobile Station - Base
Station System (MS - BSS) interface; General aspects and principles".
[3] GSM 04.03: "Digital cellular telecommunications system (Phase 2+); Mobile
Station - Base Station System (MS - BSS) interface Channel structures and
access capabilities".
[4] GSM 04.04 (ETS 300 936): "Digital cellular telecommunications system; Layer 1
General requirements".
[5] GSM 04.05 (ETS 300 937): "Digital cellular telecommunications system; Data
Link (DL) layer General aspects".
[6] GSM 04.07 (ETS 300 939): "Digital cellular telecommunications system
(Phase 2+); Mobile radio interface signalling layer 3; General aspects".
[7] GSM 04.08 (ETS 300 940): "Digital cellular telecommunications system
(Phase 2+); Mobile radio interface layer 3 specification".
[8] GSM 04.10 (ETS 300 941): "Digital cellular telecommunications system; Mobile
radio interface layer 3 Supplementary services specification; General aspects".
[9] GSM 04.12 (ETS 300 943): "Digital cellular telecommunications system
(Phase 2+); Short Message Service Cell Broadcast (SMSCB) support on the
mobile radio interface".
[10] GSM 05.02 (ETS 300 908): "Digital cellular telecommunications system
(Phase 2+); Multiplexing and multiple access on the radio path".
[11] GSM 08.56: "Digital cellular telecommunications system; Base Station Controller
- Base Transceiver Station (BSC - BTS) interface; Layer 2 specification".
[12] GSM 08.58: "Digital cellular telecommunications system (Phase 2+); Base
Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 3
specification".
[13] CCITT Recommendation Z.100: "Specification and description language (SDL)".
0.2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04.

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1 General
This ETS describes the frame structure, elements of procedure, format of fields and procedures for the
proper operation of the Link Access Procedure on the Dm channel, LAPDm.
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 GSM 04.03.
The concepts, terminology, overview description of LAPDm functions and procedures, and the relationship
with other Technical Specifications are described in general terms in GSM 04.05.
The frame formats defined for LAPDm are based on those defined for LAPD. However, there are
important differences between LAPDm and LAPD, in particular with regard to frame delimitation methods
and transparency mechanisms. These differences are necessary for operation within the constraints set
by the radio path.
LA
...