SIST EN 300 924 V6.0.1:2003

• Abstract:

  Upgrade from Phase 2+ to Release 1997

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Mandate: UIC
• Ref Project: ETSI EN 300 924 V6.0.0 (1999-04) - Digital cellular telecommunications system (Phase 2+) (GSM); enhanced Multi-Level Precedence and Pre-emption service (eMLPP) - Stage 1 (GSM 02.67 version 6.0.1 Release 1997)

Overview

SIST EN 300 924 V6.0.1:2003 defines the enhanced Multi-Level Precedence and Pre-emption service (eMLPP) as part of the digital cellular telecommunications system (GSM Phase 2+), aligned with GSM 02.67 version 6.0.1, Release 1997. This European standard, adopted by the Slovenski inštitut za standardizacijo (SIST), outlines stage 1 requirements for providing prioritized call handling and resource management within GSM networks.

eMLPP is a supplementary GSM service that enables calls to be assigned different priority (precedence) levels. In situations where network resources are congested, higher priority calls are granted faster call set-up and may pre-empt (disconnect or put on hold) ongoing lower-priority calls, ensuring critical communications are maintained. The standard supports both standard and emergency applications within GSM networks.

Key Topics

• Precedence Levels:
  eMLPP supports up to seven precedence levels, allowing differentiation of calls according to urgency and importance. The two highest levels are reserved for network internal use, particularly for emergency and operator calls.

• Pre-emption Capability:
  Network resources can be dynamically reallocated by pre-empting lower priority calls, thus guaranteeing higher-priority call setup, especially during network congestion or handover.

• Flexible Subscription Management:
  Operators can assign users a maximum authorized precedence level during subscription. Users may select their authorized precedence for each call or rely on a default.

• Integration with GSM Services:
  eMLPP interacts with other supplementary services, such as Call Waiting, Call Hold, and Call Forwarding, ensuring seamless operation within the broader GSM service framework.

• Performance Classes:
  eMLPP specifies three classes of call set-up times:

  • Class 1: Fast (1-2 seconds, primarily for highest priority calls)
  • Class 2: Normal (<5 seconds)
  • Class 3: Slow (<10 seconds)

Applications

eMLPP is essential for scenarios where guaranteed communications are critical, such as:

• Public safety and emergency services:
  Fast and prioritized call setup for police, fire, or medical services during emergencies, enabling crucial messages to be delivered even in congested networks.

• Military and government communications:
  Support for secure, prioritized mobile communications, including pre-emption for critical command and control activities.

• Group and broadcast calls:
  Enhances voice group call (VGCS) and voice broadcast (VBS) services, ensuring group coordination is uninterrupted by network congestion.

• Corporate and industrial use:
  Enables prioritization for field operations or essential personnel, supporting operational resilience during large events or disruptions.

Practical benefits include:

• Improved call reliability for high-priority users
• Increased network efficiency under heavy load
• Seamless interworking with ISDN MLPP where applicable

Related Standards

• GSM 02.04: General description of supplementary services in GSM
• GSM 02.24: Description of Charge Advice Information (CAI)
• GSM 02.40: Procedures for call progress indications in GSM
• GSM 02.68: Voice Group Call Service (VGCS) - Stage 1
• GSM 02.69: Voice Broadcast Service (VBS) - Stage 1
• ITU-T I.255.3: ISDN Multi-Level Precedence and Pre-emption (MLPP) - stage 1
• SIST EN 300 924 V6.0.1:2003 aligns with EN 300 924 Version 6.0.1
• GSM 01.04: Abbreviations and acronyms for digital cellular telecommunications

For further details on implementation or integration with other GSM or ISDN services, network operators and service providers should refer to the specific standards listed above.

Keywords: GSM, digital cellular telecommunications, eMLPP, precedence, pre-emption, call prioritization, supplementary services, network management, emergency communications, public safety, Release 1997, SIST standards.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital cellular telecommunications system (Phase 2+) (GSM); enhanced Multi-Level Precedence and Pre-emption service (eMLPP) - Stage 1 (GSM 02.67 version 6.0.1 Release 1997)33.070.50Globalni sistem za mobilno telekomunikacijo (GSM)Global System for Mobile Communication (GSM)ICS:Ta slovenski standard je istoveten z:EN 300 924 Version 6.0.1SIST EN 300 924 V6.0.1:2003en01-december-2003SIST EN 300 924 V6.0.1:2003SLOVENSKI
STANDARD
EN 300 924 V6.0.1 (1999-09)European Standard (Telecommunications series)Digital cellular telecommunications system (Phase 2+);enhanced Multi-Level Precedence and Pre-emption service(eMLPP) - Stage 1(GSM 02.67 version 6.0.1 Release 1997)GLOBAL SYSTEM
FOR MOBILE COMMUNICATIONSRSIST EN 300 924 V6.0.1:2003

ETSIEN 300 924 V6.0.1 (1999-09)2GSM 02.67 version 6.0.1 Release 1997ReferenceDEN/SMG-010267Q6 (8k00300o.PDF)KeywordsDigital cellular telecommunications system,Global System for Mobile communications (GSM)ETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail] copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgIf you find errors in the present document, send yourcomment to: [e-mail] NotificationNo 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.SIST EN 300 924 V6.0.1:2003

ETSIEN 300 924 V6.0.1 (1999-09)3GSM 02.67 version 6.0.1 Release 1997ContentsIntellectual Property Rights.4Foreword.41Scope.52References.53Definitions and abbreviations.63.1Definitions.63.2Abbreviations.64Description.64.1Applicability to telecommunication services.95Normal operation with successful outcome.95.1Provision.95.2Withdrawal.95.3Registration.95.4Erasure.95.5Network related service configuration.105.6Activation.105.7Deactivation.105.8Invocation.105.9Normal operation.105.10Interrogation.105.11Charging requirements.116Exceptional procedures or unsuccessful outcome.117Alternate procedures.118Interaction with other supplementary services.118.1Calling Line Identification Presentation (CLIP).118.2Calling Line Identification Restriction (CLIR).118.3Connected Line Identification Presentation (COLP).118.4Connected Line Identification Restriction (COLR).118.5Call Forwarding Unconditional (CFU).118.6Call Forwarding on mobile subscriber busy (CFB).118.7Call Forwarding on No Reply (CFNRy).128.8Call Forwarding on mobile subscriber Not Reachable (CFNRc).128.9Call Waiting (CW).128.10Call Hold.128.11Multi-party Service (MPTY).128.12Closed User Group (CUG).128.13Advice of Charge (AoC).128.14Barring of Outgoing Calls (BAOC).128.15Barring of Outgoing International Calls (BOIC).128.16Barring of Outgoing International Calls except those to the Home PLMN country (BOIC-exHC).128.17Barring of All Incoming Calls (BAIC).138.18Barring of Incoming Calls when Roaming outside the home PLMN country (BIC-Roam).138.19Call Transfer (ECT).139Interworking considerations.13Annex A (informative):Status of Technical Specification GSM 02.67.14History.15SIST EN 300 924 V6.0.1:2003

ETSIEN 300 924 V6.0.1 (1999-09)4GSM 02.67 version 6.0.1 Release 1997Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI 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 guaranteecan 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.ForewordThis European Standard (Telecommunications series) has been produced by the Special Mobile Group (SMG).The present document specifies the stage 1 description of the enhanced Multi-Level Precedence and Pre-emptionService (eMLPP) within the digital cellular telecommunications system.The contents of the present document may be subject to continuing work within SMG and may change following formalSMG approval. Should SMG modify the contents of the present document it will then be re-submitted for formalapproval procedures by ETSI with an identifying change of release date and an increase in version number as follows:Version 6.x.ywhere:6GSM Phase 2+ Release 1997xthe second digit is incremented for changes of substance, i.e. technical enhancements, corrections, updates,etc.;ythe third digit is incremented when editorial only changes have been incorporated in the specification.Proposed national transposition datesDate of adoption of this EN:3 September 1999Date of latest announcement of this EN (doa):31 December 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):30 June 2000Date of withdrawal of any conflicting National Standard (dow):30 June 2000SIST EN 300 924 V6.0.1:2003

ETSIEN 300 924 V6.0.1 (1999-09)5GSM 02.67 version 6.0.1 Release 19971ScopeThe present document specifies the stage 1 description of the enhanced Multi-Level Precedence and Pre-emptionService (eMLPP). This service has two parts: precedence and pre-emption. Precedence involves assigning a prioritylevel to a call in combination with fast call set-up. Pre-emption involves the seizing of resources, which are in use by acall of a lower precedence, by a higher level precedence call in the absence of idle resources. Pre-emption can alsoinvolve the disconnection of an on-going call of lower precedence to accept an incoming call of higher precedence.The eMLPP service is provided as a network operator's option to a domain of a network. The domain can be the wholenetwork or a subset of the network. The eMLPP service applies to all network resources in the domain that is incommon use. The eMLPP service is applicable to all mobile stations in the domain with all or some mobile stationshaving a respective subscription assigning precedence according to the eMLPP service.eMLPP is a supplementary service and shall be provided to a subscriber for all basic services subscribed to and forwhich eMLPP applies.NOTE:It is under study whether normal GSM Phase 2 Mobile Stations will be able to be used for this service.The service is described from the service subscriber's and user's point of view, in particular:-the procedure for normal operation with successful outcome;-the action to be taken in exceptional circumstances;-the interaction with other GSM services and features.The present document does not deal with the Man-Machine Interface (MMI) requirements, but makes reference to theappropriate Global System for Mobile communications (GSM) specifications.The present document is applicable to teleservices 1x and 6x and to all bearer services used in a mobile networkaccording to the digital cellular telecommunications system GSM if eMLPP is provided. Any interaction with otherservices and/or networks not dealt with in clauses 8 or 9 are outside the scope of the present document.2ReferencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.· References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.· For a specific reference, subsequent revisions do not apply.· For a non-specific reference, the latest version applies.· A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.· For this Release 1997 document, references to GSM documents are for Release 1997 versions (version 6.x.y).[1]GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations andacronyms".[2]GSM 02.04: "Digital cellular telecommunications system (Phase 2+); General on supplementaryservices".[3]GSM 02.24: "Digital cellular telecommunications system (Phase 2+); Description of ChargeAdvice Information (CAI)".[4]GSM 02.40: "Digital cellular telecommunications system (Phase 2+); Procedures for call progressindications".SIST EN 300 924 V6.0.1:2003

ETSIEN 300 924 V6.0.1 (1999-09)6GSM 02.67 version 6.0.1 Release 1997[5]GSM 02.68: "Digital cellular telecommunications system (Phase 2+); Voice Group Call Service(VGCS) - Stage 1".[6]GSM 02.69: "Digital cellular telecommunications system (Phase 2+); Voice Broadcast Service(VBS) - Stage 1".[7]GSM 03.05: "Digital cellular telecommunications system (Phase 2+); Technical performanceobjectives".[8]GSM 03.68: "Digital cellular telecommunications system (Phase 2+); Voice Group Call Service(VGCS) - Stage 2".[9]GSM 03.69: "Digital cellular telecommunications system (Phase 2+); Voice Broadcast Service(VBS) - Stage 2".[10]ITU-T Recommendation I.255.3: "ISDN Multi-Level Precedence and Pre-emption (MLPP)stage 1".3Definitions and abbreviations3.1DefinitionsFor the purposes of the present document, the following definitions apply:calling subscriber: Service subscriber which invokes the eMLPP service.network operator: Entity which provides the network operating elements and resources for the execution of theenhanced Multi-Level Precedence and Pre-emption service (eMLPP).precedence: Precedence is the priority associated with a call.service provider: Entity which offers the eMLPP service for subscription. The network operator may be the serviceprovider.service subscriber: Mobile subscriber which subscribes to the eMLPP service. In principle, if a network provideseMLPP service, all users are able to subscribe to this service.3.2AbbreviationsFor the purposes of the present document, the following abbreviations apply, in addition to those listed in GSM 01.04:eMLPPenhanced Multi-Level Precedence and Pre-emption4Descriptiona)The enhanced Multi-Level Precedence and Pre-emption service (eMLPP) provides different levels of precedencefor call set-up and for call continuity in case of handover.eMLPP shall be applicable also in case of roaming if supported by the related networks.The maximum precedence level of a subscriber is set at the subscription time by the service provider, based onthe subscriber's need. The subscriber may select a precedence level up to and including the maximum precedencelevel subscribed to, on a per call basis.There are at maximum 7 priority levels. The two highest levels are reserved for network internal use, e.g. foremergency calls or the network related service configurations for specific voice broadcast or voice group callservices. These two levels can only be used locally, i.e. in the domain of one MSC. The other five priority levelsare offered for subscription and can be applied globally, e.g. on inter switch trunks, if supported by all relatednetwork elements, and also for interworking with ISDN networks providing the MLPP service.SIST EN 300 924 V6.0.1:2003

ETSIEN 300 924 V6.0.1 (1999-09)7GSM 02.67 version 6.0.1 Release 1997The seven priority levels are defined as follows:A(highest, for network internal use).B(for ne
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