SIST ETS 300 924 E1:2003

• Abstract:

  This European Telecommunication Standard (ETS) specifies the stage 1 d escription of the enhanced Multi-Level Precedence and Pre-emption Serv ice (eMLPP). This service has two parts: precedence and pre-emption. P recedence involves assigning a priority level to a call in combination with fast call set-up. Pre-emption involves the seizing of resources, which are in use by a call of a lower precedence, by a higher level p recedence call in the absence of idle resources. Pre-emption can also involve the disconnection of an on-going call of lower precedence to a ccept an incoming call of higher precedence. The eMLPP service is provided as a network operator s option to a doma in of a network. The domain can be the whole network or a subset of th e network. The eMLPP service applies to all network resources in the d omain that is in common use. The eMLPP service is applicable to all mo bile stations in the domain with all or some mobile stations having a respective subscription assigning precedence according to the eMLPP se rvice. eMLPP is a supplementary service and shall be provided to a subscriber for all basic services subscribed to and for which eMLPP applies. NOTE: It is under study whether normal GSM phase 2 mobile stations wil l be able to be used for this service. The service is described from the service subscriber s and user s poin t 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. This ETS does not deal with the Man-Machine Interface (MMI) requiremen ts, but makes reference to the appropriate Global System for Mobile co mmunications (GSM) specifications. This ETS is applicable to telese vices 1x and 6x and to all bearer ser vices used in a mobile network according to the digital cellular telec ommunications system GSM if eMLPP is provided. Any interaction with ot her services and/or networks not dealt with in s

• 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 ETS 300 924 ed.1 (1997-05) - Digital cellular telecommunications system (Phase 2+) (GSM); enhanced Multi-Level Precedence and Pre-emption service (eMLPP); Stage 1 (GSM 02.67 version 5.0.3)

Overview

SIST ETS 300 924 E1:2003 defines the enhanced Multi-Level Precedence and Pre-emption Service (eMLPP) within the digital cellular telecommunications system (GSM Phase 2+). Developed by the European Telecommunications Standards Institute (ETSI) and adopted as a Slovenian standard by SIST, this specification outlines how network operators can assign call priority levels and pre-empt resources for critical communications needs. eMLPP is a supplementary service that enables prioritization and resource management for calls, supporting both regular and emergency communications scenarios in mobile networks.

Key Topics

• Precedence and Pre-emption: The core value of eMLPP lies in its ability to assign multiple priority levels to calls (up to seven, with two reserved for network use and five available for subscription). When network resources are limited, calls with higher precedence can pre-empt those with lower precedence, ensuring that urgent communications go through.
• Flexible Domain Scope: Network operators can apply eMLPP to the entire network or just a subset, allowing customization for organizational or regional requirements.
• Subscription Management: eMLPP can be subscribed to by any mobile station within the covered domain, with each subscription determining the allowed precedence level for outgoing calls.
• Call Set-Up Performance Classes: The service defines three classes for call set-up times (fast, normal, slow), enabling networks to provide rapid connect times for high-priority calls.
• Interworking with Other Networks: eMLPP levels are designed to interface with ISDN MLPP services, supporting cross-network priority handling.
• Interaction with Supplementary Services: eMLPP operates alongside standard GSM services such as Call Forwarding, Call Waiting, and Barring of Calls, with specific rules for preserving or overriding priorities.
• User and Network Roles: The service clearly distinguishes between user-selected call priorities and network-assigned defaults, with mechanisms to enforce the maximum authorized precedence on a per-user basis.

Applications

• Mission-Critical Communications: eMLPP is essential for emergency services, defense, public safety, and operations centers where crucial calls must be prioritized and resource availability can be limited.
• Corporate and Government Networks: Organizations can use eMLPP to ensure key personnel have prioritized communication, even during network congestion.
• Interoperability in Public Networks: With cross-compatibility for ISDN MLPP and the ability to interact with varying GSM services, eMLPP supports consistent priority handling across diverse telecommunications environments.
• Operational Efficiency: Fast call set-up and pre-emption ensure smoother handling of high-volume or high-urgency call situations, minimizing response times and maximizing resource use.

Related Standards

• GSM 01.04 (ETR 350): Covers abbreviations and acronyms related to GSM systems.
• GSM 02.24 (ETS 300 923): Provides details on Charge Advice Information (CAI) for GSM networks.
• GSM 02.40: Specifies call progress indications procedures.
• GSM 02.68 (ETS 300 925) & GSM 02.69 (ETS 300 926): Define Group Call Service (VGCS) and Voice Broadcast Service (VBS) in GSM.
• ITU-T Recommendation I.255.3: Defines ISDN Multi-Level Precedence and Pre-emption (MLPP), enabling interworking between GSM eMLPP and ISDN MLPP.
• GSM 03.05 (ETR 351): Details GSM technical performance objectives, relevant for eMLPP service class performance.

Keywords: enhanced Multi-Level Precedence and Pre-emption Service, eMLPP, GSM Phase 2+, digital cellular telecommunications, call prioritization, resource pre-emption, network congestion, emergency communications, supplementary service, ETSI, SIST, mobile network standards.

By implementing SIST ETS 300 924 E1:2003, network operators can guarantee prioritized access and robust management of telecommunications resources, critical for supporting public safety and high-reliability organizational operations in GSM networks.

SLOVENSKI STANDARD
01-december-2003
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SUHGQRVWQDVWRULWHYH0/33±6WRSQMD*60UD]OLþLFD
Digital cellular telecommunications system (Phase 2+) (GSM); enhanced Multi-Level
Precedence and Pre-emption service (eMLPP); Stage 1 (GSM 02.67 version 5.0.3)
Ta slovenski standard je istoveten z: ETS 300 924 Edition 1
ICS:
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 300 924
TELECOMMUNICATION May 1997
STANDARD
Source: ETSI TC-SMG Reference: DE/SMG-010267QR
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+);
enhanced Multi-Level Precedence and Pre-emption service
(eMLPP) - Stage 1
(GSM 02.67 version 5.0.3)
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: [e-mail]
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 1997. All rights reserved.

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ETS 300 924 (GSM 02.67 version 5.0.3): May 1997
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 300 924 (GSM 02.67 version 5.0.3): May 1997
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Description .9
4.1 Applicability to telecommunication services.11
5 Normal operation with successful outcome.12
5.1 Provision .12
5.2 Withdrawal .12
5.3 Registration.12
5.4 Erasure .12
5.5 Network related service configuration.12
5.6 Activation .12
5.7 Deactivation .12
5.8 Invocation.12
5.9 Normal operation .13
5.10 Interrogation.13
5.11 Charging requirements .13
6 Exceptional procedures or unsuccessful outcome.13
7 Alternate procedures.13
8 Interaction with other supplementary services .14
8.1 Calling Line Identification Presentation (CLIP) .14
8.2 Calling Line Identification Restriction (CLIR) .14
8.3 Connected Line Identification Presentation (COLP) .14
8.4 Connected Line Identification Restriction (COLR) .14
8.5 Call Forwarding Unconditional (CFU) .14
8.6 Call Forwarding on mobile subscriber busy (CFB) .14
8.7 Call Forwarding on No Reply (CFNRy).14
8.8 Call Forwarding on mobile subscriber Not Reachable (CFNRc) .14
8.9 Call Waiting (CW).14
8.10 Call Hold .14
8.11 Multi-party Service (MPTY).14
8.12 Closed User Group (CUG).15
8.13 Advice of Charge (AoC).15
8.14 Barring of Outgoing Calls (BAOC) .15
8.15 Barring of Outgoing International Calls (BOIC).15
8.16 Barring of Outgoing International Calls except those to the Home PLMN country
(BOIC-exHC) .15
8.17 Barring of All Incoming Calls (BAIC).15
8.18 Barring of Incoming Calls when Roaming outside the home PLMN country (BIC-Roam).15
8.19 Call Transfer (ECT).15
8.20 Completion of Calls to Busy Subscriber (CCBS) .15
9 Interworking considerations.15
Annex A (informative): Status of Technical Specification GSM 02.67 .16
History.17

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ETS 300 924 (GSM 02.67 version 5.0.3): May 1997
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ETS 300 924 (GSM 02.67 version 5.0.3): May 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Special Mobile Group
(SMG) Technical Committee (TC) of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the stage 1 description of the enhanced Multi-Level Precedence and Pre-emption
Service (eMLPP) within the digital cellular telecommunications system.
The contents of this ETS is subject to continuing work within TC-SMG and may change following formal
TC-SMG approval. Should TC-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:
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.
Transposition dates
Date of adoption: 18 April 1997
Date of latest announcement of this ETS (doa): 31 August 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 28 February 1998
Date of withdrawal of any conflicting National Standard (dow): 28 February 1998

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ETS 300 924 (GSM 02.67 version 5.0.3): May 1997
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ETS 300 924 (GSM 02.67 version 5.0.3): May 1997
1 Scope
This European Telecommunication Standard (ETS) specifies the stage 1 description of the enhanced
Multi-Level Precedence and Pre-emption Service (eMLPP). This service has two parts: precedence and
pre-emption. Precedence involves assigning a priority level to a call in combination with fast call set-up.
Pre-emption involves the seizing of resources, which are in use by a call of a lower precedence, by a
higher level precedence call in the absence of idle resources. Pre-emption can also involve 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 whole network or a subset of the network. The eMLPP service applies to all network resources in
the domain that is in common use. The eMLPP service is applicable to all mobile stations in the domain
with all or some mobile stations having 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 for which 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.
This ETS does not deal with the Man-Machine Interface (MMI) requirements, but makes reference to the
appropriate Global System for Mobile communications (GSM) specifications.
This ETS is applicable to teleservices 1x and 6x and to all bearer services used in a mobile network
according to the digital cellular telecommunications system GSM if eMLPP is provided. Any interaction
with other services and/or networks not dealt with in clauses 8 or 9 are 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 the 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 02.24 (ETS 300 923): "Digital cellular telecommunications system;
Description of Charge Advice Information (CAI)".
[3] GSM 02.40: "Digital cellular telecommunications system; Procedures for call
progress indications".
[4] GSM 02.68 (ETS 300 925): "Digital cellular telecommunications system
(Phase 2+); Voice Group Call Service (VGCS) - Stage 1".
[5] GSM 02.69 (ETS 300 926): "Digital cellular telecommunications system
(Phase 2+); Voice Broadcast Service (VBS) - Stage 1".

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ETS 300 924 (GSM 02.67 version 5.0.3): May 1997
[6] GSM 03.05 (ETR 351): "Digital cellular telecommunications system; Technical
performance objectives".
[7] GSM 03.68 (ETS 300 933): "Digital cellular telecommunications system
(Phase 2+); Voice Group Call Service (VGCS) - Stage 2".
[8] GSM 03.69 (ETS 300 934): "Digital cellular telecommunications system
(Phase 2+); Voice Broadcast Service (VBS) - Stage 2".
[9] ITU-T Recommendation I.255.3: "ISDN Multi-Level Precedence and
Pre-emption (MLPP) stage 1".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, 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 the enhanced 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 service provider.
service subscriber: Mobile subscriber which subscribes to the eMLPP service. In principle, if a network
provides eMLPP service, all users are able to subscribe to this service.
3.2 Abbreviations
Abbreviations used in this ETS are listed in GSM 01.04.
eMLPP enhanced Multi-Level Precedence and Pre-emption

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ETS 300 924 (GSM 02.67 version 5.0.3): May 1997
4 Description
a) The enhanced Multi-Level Precedence and Pre-emption service (eMLPP) provides different levels
of precedence for 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 on the subscriber's need. The subscriber may select a precedence level up to and
including the maximum precedence level 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. for emergency calls or the network related service configurations for specific voice
broadcast or voice group call services. These two levels can only be used locally, i.e. in the domain
of one MSC. The other five priority levels are offered for subscription and can be applied globally,
e.g. on inter switch trunks, if supported by all related network elements, and also for interworking
with ISDN networks providing the MLPP service.
The seven priority levels are defined as follows:
A (highest, for network internal use)
B (for network internal use)
0 (for subscription)
1 (for subscription)
2 (for subscription)
3 (for subscription)
4 (lowest, for subscription).
Levels A and B shall be mapped to level 0 for priority treatment outside of the MSC area in which
they are applied.
b) Priorities shall be treated in the network as defined for the following call scenarios:
- Mobile originated calls:
- The priority level depends on the calling subscriber.
- If the user has no eMLPP subscription, the call shall have a default priority level
defined in the network.
- If the user has an eMLPP subscription, the call shall have the priority level selected by
the user at set-up or the priority level predefined by the subscriber as default prio
...