SIST ETS 300 499:1998
(Main)Digital Enhanced Cordless Telecommunications (DECT); Global System for Mobile communications (GSM); DECT/GSM Interworking Profile (IWP); Mobile services Switching Centre (MSC) - Fixed Part (FP) interconnection
- Abstract
Connection and message handling between DECT FP and GSM fixed network at the A-interface.
- Status
- Published
- Publication Date
- 31-Aug-1998
- Technical Committee
- RES - Radio equipment and systems
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Sep-1998
- Due Date
- 01-Sep-1998
- Completion Date
- 01-Sep-1998
SIST ETS 300 499:1998 is the Slovenian adoption of ETS 300 499 Edition 1 from ETSI. It specifies the DECT/GSM interworking profile for connection and message handling between a Digital Enhanced Cordless Telecommunications (DECT) Fixed Part (FP) and a Global System for Mobile communications (GSM) Mobile services Switching Centre (MSC) at the A-interface. In practice, it tells an FP implementer how to behave so that the DECT side can interwork with a GSM fixed network as a GSM Base Station Controller (BSC)-like entity.
What does SIST ETS 300 499:1998 specify?
SIST ETS 300 499:1998 specifies the FP-MSC interface used in the DECT/GSM Interworking Profile (IWP). The document concentrates on the exceptions to the GSM 08.0X Technical Specifications and places requirements on the DECT FP side of the interface.
The standard is organized into:
- scope and normative references,
- definitions and abbreviations,
- general interface model,
- FP-MSC interface principles,
- application to layer 3 interface structures,
- the Fixed Part Management Application Part (FPMAP),
- annexes that map FPMAP procedures and messages to BSSMAP.
| Annex | What it covers |
|---|---|
| Annex A | FPMAP procedures associated with BSSMAP procedures |
| Annex B | FPMAP message per FPMAP procedure associated with BSSMAP message |
| Annex C | Bibliography |
The scope is limited to the A-interface relationship between the DECT FP and the GSM MSC. Interworking via other interfaces is outside the document’s scope.
What are the key requirements of SIST ETS 300 499:1998?
SIST ETS 300 499:1998 defines how a DECT FP shall present itself to a GSM MSC, how signalling is carried, and how key call, mobility and resource procedures are handled. The practical effect is that the FP must manage the GSM-side interface consistently enough to support GSM services for DECT users.
Interface model and transport
Clause 5 states that the FP-MSC interface shall support all services offered to a DECT user with a GSM subscription. The interface follows a layered approach similar to the GSM A-interface, which matters because implementers can reuse the same overall signalling structure and design discipline.
Clause 5 also says the FP handles terrestrial channel management, user data encryption, signalling element encryption, radio management, transcoding and rate adaption. The interface uses one or more 2 048 kbit/s digital transmission system interfaces, with 31 x 64 kbit/s channels per interface, while the DECT radio path traffic channel is 32 kbit/s. In practice, that means the FP must include rate adaptation between the GSM-side transport and the DECT radio side.
Layer 1 and signalling transport
Clause 5.3 makes the FP-MSC Layer 1 specification identical to ETS 300 588 / GSM 08.04. Clause 5.4 makes the signalling transport mechanism identical to ETS 300 589 / GSM 08.06, except that BSSAP, DTAP and BSSMAP are replaced by FPAP, DCMAP and FPMAP.
That matters because the interface is not invented from scratch - it reuses the GSM transport model and changes the application-layer names and behaviours where needed for DECT.
Application-layer split
Clause 6 states that signalling is carried over Message Transfer Part (MTP) and Signalling Connection Control Part (SCCP). The FP Application Part (FPAP) is split into FPMAP and DCMAP, while FPOMAP is mentioned for further study.
For an implementer, this means the MSC-facing interface carries both management traffic and connection/mobility traffic, but the document focuses on the management side and on the subsets of GSM procedures that the FP must support.
FPMAP procedures and SCCP use
Clause 7.1 lists the FPMAP procedures, including assignment, blocking, reset, release, paging, flow control, cipher mode control, trace invocation, initial PP message, data link control SAPI not equal to 0, reset circuit, internal handover, external handover and load indication. The standard also distinguishes global procedures from dedicated procedures.
This distinction matters in operation: global procedures use connectionless SCCP service, while dedicated procedures use connection-oriented SCCP service on the established call-related connection.
Resource, release and paging handling
The assignment procedure allocates a terrestrial resource to a DECT Portable Part (PP) by sending an ASSIGNMENT REQUEST and completing with ASSIGNMENT COMPLETE or ASSIGNMENT FAILURE. Release is handled with CLEAR REQUEST, CLEAR COMMAND and CLEAR COMPLETE, and paging is carried as a connectionless PAGING message.
In practice, these clauses tell the FP how to allocate and free terrestrial circuits, how to respond when a resource is unavailable or blocked, and how to start a PP search when the MSC pages a user.
Ciphering, overload and handover
Clause 7.1.9 describes cipher mode control, including CIPHER MODE COMMAND, CIPHER MODE COMPLETE and CIPHER MODE REJECT. Clause 7.1.8 covers overload signalling in both MSC and FP directions. Clause 7.1.13 and 7.1.14 cover internal and external handover handling.
These procedures are the operational core of the interface. They define how the FP reacts to security setup, congestion and mobility events, which directly affects call continuity and radio security.
Error handling and coding rules
Clause 7.1.16 sets the FPMAP error handling rules, including the use of CONFUSION for unsupported GSM BSSMAP messages received by the FP. Clauses 7.2 and 7.3 define which messages, information elements and coding values are applicable on the A-interface, and which are exceptions.
For implementation and testing, this is important because conformance depends not only on sending the right messages, but also on rejecting or ignoring unsupported ones in the specified way.
What terms does SIST ETS 300 499:1998 define?
- DECT Network (DNW) - A logical DECT network that connects a local network to one or more portable applications through the DECT air interface.
- Fixed Part (FP), DECT FP - The physical grouping between the local network and the DECT air interface; it contains at least one Fixed radio Termination (FT).
- Portable Part (PP), DECT PP - The physical grouping between the user and the DECT air interface; it may consist of one or more physical pieces.
- Interworking Unit (IWU) - A unit that interconnects sub-networks and contains the interworking functions needed to support them.
- FPMAP - The Fixed Part Management Application Part, which carries procedures that require interpretation and processing of single-call and terrestrial resource management information.
- DCMAP - The DECT Connection and Mobility Application Part, used to transfer Connection Management and Mobility Management information between the MSC and the PP.
- MSC - The Mobile Switching Centre, the GSM-side switching entity that communicates with the FP in this profile.
- SCCP - The Signalling Connection Control Part of signalling system No. 7, used here to carry the FPAP messages.
Who uses SIST ETS 300 499:1998?
SIST ETS 300 499:1998 is used by DECT and GSM equipment manufacturers, especially teams designing the DECT FP side of a GSM interworking implementation. It is also used by network engineers and integrators who connect DECT systems to GSM core infrastructure in public or private environments.
Quality and test teams use it to check message mapping, SCCP behaviour, error handling and procedure support at the A-interface. Mobile network operators and buyers use it to confirm that an FP can interwork with an MSC while supporting the intended GSM services.
What changed in SIST ETS 300 499:1998 from the previous edition?
SIST ETS 300 499:1998 corresponds to ETS 300 499 Edition 1. The document history identifies it as the first edition.
Which standards are used with SIST ETS 300 499:1998?
The standard is built on a small set of GSM A-interface specifications and a wider set of DECT/GSM interworking documents.
| Reference group | Standards and contribution |
|---|---|
| GSM A-interface base | ETS 300 587-1, ETS 300 587-2, ETS 300 588, ETS 300 589, ETS 300 590 - provide the GSM BSS-MSC interface model, principles, layer 1, signalling transport and layer 3 basis reused by the FP-MSC interface |
| DECT/GSM IWP core | ETS 300 370, ETS 300 466, ETS 300 703 - provide access and mapping, service requirements and supplementary services for the DECT/GSM interworking profile |
| DECT system basis | ETS 300 175 - provides the DECT Common Interface on which the FP behaviour is based |
| DECT background documents | ETR 015, ETR 043, ETR 056, ETR 159 - provide DECT reference, services, system description and GSM mobility background |
| Related IWP parts | ETS 300 702, ETS 300 756, ETS 300 764, DE/RES-03072 - cover the wider DECT/GSM interworking profile, bearer services, short message service and facsimile group 3 |
| Conformance material | ETS 300 704-1, ETS 300 704-2 - provide profile implementation conformance statement parts for Portable radio Termination and Fixed radio Termination |
What does the SIST ETS 300 499:1998 document contain?
The document contains the interface model, the procedure set, the message and information element mappings, and the exception rules needed for DECT FP to GSM MSC interworking. It gives the FPMAP procedures, their SCCP transport mode, and the corresponding message contents and coding rules.
It also contains normative annex tables that map FPMAP procedures and messages to BSSMAP equivalents, which is useful for design review and interoperability checking. In addition, the document includes the special handling rules for abnormal events, timers, overload, ciphering and handover.
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Frequently Asked Questions
SIST ETS 300 499:1998 is a standardization document published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital Enhanced Cordless Telecommunications (DECT); Global System for Mobile communications (GSM); DECT/GSM Interworking Profile (IWP); Mobile services Switching Centre (MSC) - Fixed Part (FP) interconnection". This standard covers: Connection and message handling between DECT FP and GSM fixed network at the A-interface.
Connection and message handling between DECT FP and GSM fixed network at the A-interface.
SIST ETS 300 499:1998 is classified under the following ICS (International Classification for Standards) categories: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT); 33.070.50 - Global System for Mobile Communication (GSM). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 499:1998 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-1998
'LJLWDOQHL]EROMãDQHEUH]YUYLþQHWHOHNRPXQLNDFLMH '(&7 *OREDOQLVLVWHP
PRELOQLKNRPXQLNDFLM *60 3URILOY]DMHPQHJDGHORYDQMD'(&7*60 ,:3
.RPXWDFLMVNLFHQWHU]DPRELOQHVWRULWYH 06& 0HGVHERMQDSRYH]DYDVILNVQLP
GHORP )3
Digital Enhanced Cordless Telecommunications (DECT); Global System for Mobile
communications (GSM); DECT/GSM Interworking Profile (IWP); Mobile services
Switching Centre (MSC) - Fixed Part (FP) interconnection
Ta slovenski standard je istoveten z: ETS 300 499 Edition 1
ICS:
33.070.30 'LJLWDOQHL]EROMãDQH Digital Enhanced Cordless
EUH]YUYLþQHWHOHNRPXQLNDFLMH Telecommunications (DECT)
'(&7
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 499
TELECOMMUNICATION September 1996
STANDARD
Source: ETSI TC-RES Reference: DE/RES-03049
ICS: 33.020, 30.060.50
Key words: DECT, GSM, interworking
Radio Equipment and Systems (RES);
Digital Enhanced Cordless Telecommunications/
Global System for Mobile Communications
(DECT/GSM) interworking profile;
Mobile services Switching Centre (MSC) -
Fixed Part (FP) interconnection
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
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 92 94 42 00 - 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.
© European Telecommunications Standards Institute 1996. All rights reserved.
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ETS 300 499: September 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 comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.
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ETS 300 499: September 1996
Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .9
3.1 DECT definitions.9
3.2 Abbreviations .9
4 General.10
5 FP-MSC interface.10
5.1 General aspects (ETS 300 587-1, GSM 08.01).10
5.2 Interface principles (ETS 300 587-2, GSM 08.02).10
5.3 Layer 1 specification (ETS 300 588, GSM 08.04).11
5.4 Signalling transport mechanism (ETS 300 589, GSM 08.06).11
6 Application to layer 3 interface structures .12
6.1 The FP operation and maintenance application part .12
6.2 The DCMAP.12
6.3 The FP Management Application Part, FPMAP .12
6.4 Handling of abnormal events related to the FPAP header .12
7 The FP management application part.13
7.1 FPMAP procedures.13
7.1.1 Assignment procedure .13
7.1.1.1 Successful operation .14
7.1.2 Assignment failure.14
7.1.2.1 Abnormal conditions .14
7.1.3 Blocking and unblocking.15
7.1.4 Reset .15
7.1.4.1 Global reset procedure .15
7.1.4.2 Reset circuit.15
7.1.5 Release .15
7.1.5.1 Release due to transaction completion .15
7.1.5.2 Release due to FP generated reasons.15
7.1.6 Paging .16
7.1.7 Trace invocation.16
7.1.8 Flow control .16
7.1.8.1 Philosophy .16
7.1.8.2 Processor overload at the MSC.16
7.1.8.3 Processor overload at the FP .16
7.1.8.4 Message throughput congestion .16
7.1.9 Cipher mode control.17
7.1.9.1 Successful operation .17
7.1.9.2 Unsuccessful operation .17
7.1.10 General SCCP abnormal conditions .17
7.1.11 Initial PP message.18
7.1.12 Data link control SAPI not equal to <<0>> .18
7.1.12.1 Messages with SAPI value not equal to 0 across the MSC
FP interface .18
7.1.12.1.1 FP to MSC direction.18
7.1.12.1.2 MSC to FP direction.18
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ETS 300 499: September 1996
7.1.13 Internal handover. 18
7.1.14 External handover. 18
7.1.15 Load indication. 19
7.1.16 FPMAP error handling . 19
7.2 Messages and coding . 19
7.2.1 FPMAP messages on the A-interface . 19
7.2.2 FPMAP information elements on the A-interface . 21
7.2.3 FPMAP information element coding values on the A-interface . 23
7.3 Exceptions for FPMAP procedures, message contents and information element coding
values used on the A-interface. 23
7.3.1 FPMAP procedures, exceptions to BSSMAP procedures . 23
7.3.2 FPMAP messages, exceptions to BSSMAP procedures. 23
7.3.3 FPMAP information element coding . 24
7.4 FPMAP timers in the FPMAP procedures. 25
Annex A (normative): FPMAP procedures associated with BSSMAP procedures. 26
Annex B (normative): FPMAP message per FPMAP procedure associated with BSSMAP message. 27
Annex C (informative): Bibliography . 29
History. 30
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ETS 300 499: September 1996
Foreword
This European Telecommunication Standard (ETS) has been produced by the Radio Equipment and
Systems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
Transposition dates
Date of adoption of this ETS: 23 August 1996
Date of latest announcement of this ETS (doa): 31 December 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 June 1997
Date of withdrawal of any conflicting National Standard (dow): 30 June 1997
Introduction
This ETS is a part of a set of standards for the Digital Enhanced Cordless Telecommunications / Global
System for Mobile Communications (DECT/GSM) Interworking Profile (IWP) concept that includes:
- general description of service requirements, functional capabilities and information flows,
ETS 300 466 [7];
- access and mapping (protocol/procedure description for 3,1 kHz speech service), ETS 300 370 [6];
- GSM Phase 2 supplementary services implementation, ETS 300 703 [8];
- GSM MSC - DECT Fixed Part (FP) interconnection, (this ETS).
Other standards of the DECT/GSM IWP are expected to describe (see annex C):
- implementation of bearer services, ETS 300 756 [14];
- implementation of short message services, point-to-point and cell broadcast, ETS 300 764 [13];
- implementation of facsimile group 3, DE/RES-03072 [19].
This ETS is based on Digital Enhanced Cordless Telecommunications (DECT) Common Interface
specification ETS 300 175 [18] and ETS 300 370 [6] to enable DECT terminals to interwork in the public
and private environment with DECT systems which are connected to a Global System for Mobile
communications (GSM) core infrastructure. From the GSM side this ETS is based upon the specifications
of the GSM 08.0X series of Technical Specifications (TSs) [1] to [5]. Information on DECT access to the
GSM PLMN may be found in ETR 159 [9]. Further details on the DECT system may be found in
ETR 015 [10], ETR 043 [11], and ETR 056 [12].
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ETS 300 499: September 1996
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ETS 300 499: September 1996
1 Scope
This European Telecommunication Standard (ETS) is a part of the Digital Enhanced Cordless
Telecommunications / Global System for Mobile Communications (DECT/GSM) Interworking Profile (IWP)
and specifies the interface used between the Digital Enhanced Cordless Telecommunications (DECT)
Fixed Part (FP) and the Global System for Mobile communications (GSM) Mobile Switching Centre
(MSC). This ETS specifies the exceptions to theGSM 08.0X series of Technical Specifications (TSs) [1]
to [5] and only places requirements on the DECT FP.
For the purposes of Call Control (CC) and Mobility Management (MM), most messages are not
interpreted, but relayed to the underlying DECT radio sub-system. Some messages may however be
interpreted and handled at the interconnection. The DECT access protocols and a particular set of FP
interworking functions/mappings to ensure that the GSM services can be provided over DECT are
specified in ETS 300 370 [6] and ETS 300 466 [7].
The DECT sub-system uses the A-interface in the respect that the FP emulates a GSM Base Station
Controller (BSC). This ETS covers the handling of procedures that are applicable on the A-interface in
order to ensure an appropriate GSM BSC emulation. It also covers error conditions at the interface,
handling of timers and handling of message headers that are required for the correct addressing of
messages.
Interworking between the DECT FP and the GSM MSC via other interfaces is outside the scope of this
ETS.
2 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] ETS 300 587-1: "European digital cellular telecommunications system
(Phase 2); Base Station System - Mobile-services Switching Centre (BSS -
MSC) interface; General aspects (GSM 08.01)".
[2] ETS 300 587-2: "European digital cellular telecommunications system
(Phase 2); Base Station System - Mobile-services Switching Centre (BSS -
MSC) interface; Interface principles (GSM 08.02)".
[3] ETS 300 588 : "European digital cellular telecommunications system (Phase 2);
Base Station System - Mobile-services Switching Centre (BSS - MSC) interface;
Layer 1 specification (GSM 08.04)".
[4] ETS 300 589 : "European digital cellular telecommunications system (Phase 2);
Signalling transport mechanism specification for the Base Station System - Mobile-
services Switching Centre (BSS - MSC) interface (GSM 08.06)".
[5] ETS 300 590: "Digital cellular telecommunications system (Phase 2); Mobile-
services Switching Centre - Base Station System (MSC - BSS) interface;
Layer 3 specification (GSM 08.08)".
[6] ETS 300 370: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications/Global System for Mobile communications
(DECT/GSM) inter-working profile; Access and mapping (Protocol/procedure
description for 3,1 kHz speech service)".
[7] ETS 300 466: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications/Global System for Mobile Communications
(DECT/GSM) interworking profile; General description of service requirements;
Functional capabilities and information flows".
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ETS 300 499: September 1996
[8] ETS 300 703: "Radio Equipment and Systems (RES); Digital Enhanced
Cordless Telecommunications/Global System for Mobile communications
(DECT/GSM) Interworking Profile (IWP); GSM phase 2 supplementary services
implementation".
[9] ETR 159: "Radio Equipment and Systems (RES); Digital European Cordless
Telecommunications (DECT); Wide area mobility using the Global System for
Mobile communications (GSM)".
[10] ETR 015: "Radio Equipment and Systems; Digital European Cordless
Telecommunications (DECT); Reference document".
[11] ETR 043: "Radio Equipment and Systems (RES); Digital European Cordless
Telecommunications (DECT); Common interface; Services and facilities
requirements specification".
[12] ETR 056: "Radio Equipment and Systems (RES); Digital European Cordless
Telecommunications (DECT); System description document".
[13] ETS 300 764: "Radio Equipment and Systems (RES); Digital Enhanced
Cordless Telecommunications / Global System for Mobile communications
(DECT/GSM) inter-working profile; Implementation of short message service,
point-to-point and cell broadcast".
[14] ETS 300 756: "Radio Equipment and Systems (RES); Digital Enhanced
Cordless Telecommunications / Global System for Mobile communications
(DECT/GSM) interworking profile; Implementation of bearer services".
[15] ETS 300 704-1: "Radio Equipment and Systems (RES); Digital Enhanced
Cordless Telecommunications/Global System for Mobile communications
(DECT/GSM) Interworking Profile (IWP; Profile Implementation Conformance
Statement (ICS)); Part 1: Portable radio Termination (PT)".
[16] ETS 300 704-2: "Radio Equipment and Systems (RES); Digital Enhanced
Cordless Telecommunications/Global System for Mobile communications
(DECT/GSM) interworking Profile (IWP; Profile Implementation Conformance
Statement (ICS)); Part 2: Fixed radio Termination (FT)".
[17] ETS 300 702: "Radio Equipment and Systems (RES); Digital Enhanced
Cordless Telecommunications / Global System for Mobile communications
(DECT/GSM) interworking profile".
[18] ETS 300 175: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI)".
[19] DE/RES-03072: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications/Global System for Mobile Communications
(DECT/GSM) interworking profile; Implementation of facsimile group 3".
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ETS 300 499: September 1996
3 Definitions and abbreviations
3.1 DECT definitions
This subclause only includes DECT definitions valid for this ETS. A complete list of DECT definitions may
be found in ETS 300 370 [6].
DECT Network (DNW): A network that uses the DECT air interface to interconnect a local network to one
or more portable applications. The logical boundaries of the DECT network are defined to be at the top of
the DECT Network (NWK) layer.
NOTE 1: A DNW is a logical grouping that contains one or more Fixed radio Terminations (FTs)
plus their associated Portable radio Termination (PT). The boundaries of the DECT
network are not physical boundaries.
Fixed Part (FP), DECT FP: A physical grouping that contains all of the elements in the DECT network
between the local network and the DECT air interface.
NOTE 2: A DECT FP contains the logical elements of at least one FT, plus additional
implementation specific elements.
Fixed Part GSM PLMN attachment (DECT fixed part attached to a GSM MSC): A definition of a
functional environment where a DECT system (FP) is attached to a GSM MSC. The MSC in this case
refers to a functional entity providing the required MM and CC functionality defined in this ETS in order to
communicate with the FP.
Interworking Unit (IWU): A unit that is used to interconnect sub-networks.
NOTE 3: The IWU will contain the inter-working functions necessary to support the required
sub-network interworking.
Portable Part (PP), DECT PP: A physical grouping that contains all elements between the user and the
DECT air interface. PP is a generic term that may describe one or several physical pieces.
NOTE 4: A DECT PP is logically divided into one portable termination plus one or more portable
applications.
3.2 Abbreviations
For the purposes of this ETS the following abbreviations apply:
BSC GSM Base Station Controller
BSSAP Base Station System Application Part
BSSMAP GSM Base Station System - Mobile Application Part
BSSOMAP Base Station System Operation and Maintenance Part
DCMAP DECT Connection and Mobility Application Part
DECT Digital Enhanced Cordless Telecommunications
DLCI Data Link Connection Identifier
DTAP Direct Transfer Application Part
FP Fixed Part
FPAP Fixed Part Application Part
FPMAP Fixed Part Management Application Part
FPOMAP Fixed Part Operation and Maintenance Application Part
GSM Global System for Mobile Communications
IPEI International Portable Equipment Identity
IWU Interworking Unit
MM Mobility Management, a NWK layer functional grouping
MS Mobile Station
MSC Mobile Switching Centre
MTP Message Transfer Part
NWK Network layer
O&M Operations & Maintenance
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ETS 300 499: September 1996
PLMN Public Land Mobile Network
PP Portable Part
SAPI Service Access Point Identifier
SCCP Signalling Connection Control Part
TS GSM Technical Specification
4 General
This ETS is structured in the same way as GSM 08.0X series of TSs [1] to [5], but contained in a single
document, i.e. each applicable GSM 08.0X TS [1] to [5] is included as a subclause in this ETS. Only the
exceptions to the GSM 08.0X TSs [1] to [5] are specified in these subclauses.
5 FP-MSC interface
5.1 General aspects (ETS 300 587-1, GSM 08.01)
The FP-MSC interface shall be capable of supporting all the services offered to a DECT user with a GSM
subscription.
The MSC to FP interface recommendation shall allow the following:
a) connection of various manufactures FPs to the same MSC;
b) the use of the same FPs in any PLMN;
c) support of all services defined in ETS 300 370 [6] and ETS 300 466 [7].
The MSC to FP interface is specified by a set of characteristics, including:
a) physical parameters;
b) procedures.
The definition of the MSC to FP interface follows a layered approach almost identical to that used for the
A-interface.
5.2 Interface principles (ETS 300 587-2, GSM 08.02)
This subclause gives the principles on which the detailed interface specifications in the rest of this ETS
are based.
The set of fixed equipment accessed from the MSC through one particular instance of the interface will be
referred to as a DECT FP. A FP ensures the coverage of (n) DECT Radio Fixed Parts (RFPs), where (n)
can be one or more.
The interface is based on the use of one or more 2 048 kbit/s digital transmission system interfaces.
Each 2 048 kbit/s interface provides 31 x 64 kbit/s channels that can be used for traffic or signalling as the
operator requires. The DECT radio path traffic channel is at a rate of 32 kbit/s.
A rate adapting function is thus needed for the rate conversion. This rate adapting function is considered
As there is only one rate adaption
to be a part of the FP, but could physically be located at the MSC's site.
required on the MSC-FP interface, there is no need for the support of groups of circuits (circuit pools)
having different capabilities.
The functional split between the FP and the MSC are similar to the functional split between a BSC and a
MSC. Since DECT has a completely different radio management that does not use interworking, the
number of functions handled by the FP will be less than for a GSM BSC.
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ETS 300 499: September 1996
The following functions shall be handled by the FP:
- terrestrial channel management;
- user data encryption;
- signalling element encryption;
- radio management;
- transcoding and rate adaption.
Signalling messages are classified under the three following headings:
- DECT Connection and Mobility Application Part (DCMAP) messages Fixed Part Application Part
(FPAP) messages;
- Fixed Part Management Application Part (FPMAP) messages FPAP messages;
- Fixed Part Operation and Maintenance Application Part (FPOMAP).
DCMAP, FPMAP and FPAP are defined in clause 6.
The definition of the MSC to FP interface follows a layered approach, as shown in figure 1.
O ther applications
IW U
FPAP BSSAP
BSS
DTA P
DCM A P FP M A P
MAP
DE CT
p rotoc o ls
D istrib u tio n D istribution
function FP function BSS
OM AP OMAP
SCCP SCCP
MTP MTP
Physical m edia
DECT FP
G SM MSC
BSSOMAP: Base Station System Operation and Maintenance Part
Figure 1: MSC to FP interface
5.3 Layer 1 specification (ETS 300 588, GSM 08.04)
The FP-MSC Interface - Layer 1 specification is identical with the BSS-MSC Interface - Layer 1
specification as specified in ETS 300 588 [3] (GSM 08.04).
5.4 Signalling transport mechanism (ETS 300 589, GSM 08.06)
The FP-MSC Interface - Signalling transport mechanism is identical with the BSS-MSC Interface -
signalling transport mechanism as specified in ETS 300 589 [4] (GSM 08.06) with the following
exceptions:
- all appearances of Base Station System Application Part (BSSAP), Direct Transfer Application Part
(DTAP) and GSM Base Station System - Mobile Application Part (BSSMAP) shall be replaced with
FPAP, DCMAP and FPMAP respectively.
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6 Application to layer 3 interface structures
The underlying transport mechanism defined to carry signalling information between the FP and the MSC
is the Message Transfer Part (MTP), and the Signalling Connection Control Part (SCCP) of signalling
system No. 7.
The MTP and SCCP are used to support communication between the MSC and two conceptual entities
within the FP. These are:
- FP Operation and Maintenance Application Part (FPOMAP); and
- FP Application Part (FPAP).
The FPAP is split into two sub-application parts. These are:
- FP Management Application Part (FPMAP); and
- DECT Connection and Mobility Application Part (DCMAP).
The set of FPMAP procedures shall be seen as a subset of the BSSMAP procedures on the FP side of
the MSC-FP interface (called A-interface for similarity reasons with the MSC-BSC interface).
As it is considered that the MSC is not aware of interfacing an FP, it may use BSSMAP procedures that
are not defined as FPMAP procedures. The FP will then apply the corresponding error handling defined in
subclause 7.1.16. The same applies for BSSMAP messages, information elements and coding values that
are not defined as FPMAP messages, information elements and coding values, respectively.
In this ETS, a BSSMAP procedure defined in ETS 300 590 [5] (GSM 08.08) is defined as applicable when
at least both entities (MSC and FP) are able to identify it. This procedure is then defined as a FPMAP
procedure.
In the direction MSC -> FP, all information elements are applicable. This means that the FP shall at least
be able to ignore the information elements. In the direction MSC -> FP, some information element coding
values are not applicable. This means that the FP shall be able to apply the correct error handling defined
in this specification when a non-applicable value is met by the FP.
When there is an exception to any procedure in ETS 300 590 [5] (GSM 08.08) the entire procedure is re-
written.
6.1 The FP operation and maintenance application part
If operation and maintenance messages are transferred by means of this interface they shall use SCCP
messages. FPOMAP is for further study.
6.2 The DCMAP
The DCMAP is used to transfer Connection Management and Mobility Management information between
the MSC and the PP. An interworking function in the FP handles the mapping of protocol entities between
the DCMAP and the DECT radio interface protocols. This interworking is specified in ETS 300 370 [6] and
ETS 300 466 [7].
The set of DCMAP procedures is a subset of the DTAP Connection and MM procedures.
6.3 The FP Management Application Part, FPMAP
The FPMAP supports all of the procedures between the MSC and the FP that require interpretation and
processing of information related to single calls and management of terrestrial resources.
6.4 Handling of abnormal events related to the FPAP header
The handling of the FPAP header is identical with the handling of the BSSAP header as specified in TS
ETS 300 590 [5] (GSM 08.08).
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7 The FP management application part
7.1 FPMAP procedures
The BSSMAP procedures (see ETS 300 590 [5] (GSM 08.08)) applicable, to some extent, on the
A-interface and called FPMAP procedures are:
* Assignment;
# Blocking;
# Reset;
* Handover required indication;
* Handover resource allocation;
* Handover execution;
* Release;
# Paging;
# Flow control;
* Cipher mode control;
* Trace invocation;
* Initial PP message;
* Data link control SAPI not equal to 0;
# Reset circuit;
* Internal handover;
# Load indication.
NOTE: Each of the above procedures are qualified by either an asterisk (*) or as a hash
symbol (#). The hash (#) symbol denotes a global procedure that concerns a complete
FP or specific terrestrial circuits. The asterisk (*) symbol denotes a dedicated
procedure that concerns a single PP.
In addition to these procedures, the procedures for error handling are also specified.
All BSSMAP messages related to other BSSMAP procedures shall be considered as messages with non-
existent message type if received by the FP.
Messages used to support global procedures are sent using the connectionless services of the SCCP.
Messages used to support dedicated procedures are sent using the connection oriented services of the
SCCP, on the connection that has been set up to support that call or transaction. The establishment of
SCCP connections is detailed in ETS 300 589 [4] (GSM 08.06).
In the following description of each procedure specified as an exception to ETS 300 590 [5] (GSM 08.08)
it is explicitly stated whether the procedure is global or not, and hence the type of SCCP service used to
support the defined procedure.
The handling of unknown terrestrial circuits is defined in FPMAP error handling, subclause 7.1.16 and
these procedures take precedence over those of the rest of this subclause. The procedures defined in this
subclause assume that the terrestrial circuit is known by the entity concerned.
7.1.1 Assignment procedure
The purpose of the assignment procedure is to allocate a terrestrial resource to a DECT PP by provision
of a Circuit Identity Code (CIC) to the FP and to ensure that the correct dedicated radio resources are
allocated.
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7.1.1.1 Successful operation
The initial conditions are assumed to be that the DECT PP is in contact with the fixed infrastructure of a
PLMN and that the MSC has analysed any relevant call control information and wishes to allocate a
terrestrial resource to the PP.
The MSC is the entity that carries out the necessary analysis on the connect
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