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TECHNICAL REPORT
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Priority service guide
(3GPP TR 22.952 version 15.0.0 Release 15)
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3GPP TR 22.952 version 15.0.0 Release 15 1 ETSI TR 122 952 V15.0.0 (2018-07)
Reference
RTR/TSGS-0122952vf00
Keywords
GSM,LTE,UMTS
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3GPP TR 22.952 version 15.0.0 Release 15 2 ETSI TR 122 952 V15.0.0 (2018-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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 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, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
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Foreword
This Technical Report (TR) 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 deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be
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
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3GPP TR 22.952 version 15.0.0 Release 15 3 ETSI TR 122 952 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
Introduction . 6
1 Scope . 7
2 References . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 Service description . 8
4.1 Assumptions and limitations . 8
4.2 Registration / erasure . 9
4.3 Interrogation . 9
4.4 Call origination / invocation . 9
4.4.1 Service accessibility . 9
4.4.2 Priority radio resource queuing . 9
4.4.3 Directed retry . 10
4.5 Call progression . 10
4.5.1 Progression in originating network . 10
4.5.2 Progression in transit networks . 10
4.5.3 Progression in terminating networks . 10
4.5.4 Enhanced call-completion capabilities. 11
4.5.4.1 Exemption from certain restrictive Network Management Controls (NMCs) . 11
4.5.4.2 Trunk queuing . 11
4.5.4.3 Treatment of glare conditions . 12
4.5.4.4 Relationship of NMCs to trunk queuing . 12
4.6 Call termination . 12
4.7 Handover . 13
4.8 Feature interactions . 13
4.8.1 eMLPP . 13
4.8.2 Call forwarding and call redirection / deflection . 14
4.8.3 Call waiting . 14
4.8.4 Emergency calls . 14
4.8.5 Alternate Line Service (ALS) . 14
4.8.6 Asynchronous data . 14
4.8.7 Customized Applications for Mobile Enhanced Logic (CAMEL) and Intelligent Network (IN) . 15
4.8.8 Call Origination restrictions . 15
4.8.9 Call transfer . 15
4.8.10 Multi-Party supplementary service (MPTY) . 15
4.8.11 Prepaid service . 15
4.8.12 Short Message Service (SMS) . 15
4.8.13 Other supplementary services . 15
4.9 Interworking considerations . 15
4.9.1 ISDN Multiple Level Precedence and Pre-emption (MLPP) . 15
4.9.2 Roaming interactions . 16
5 Call flows . 16
5.1 Priority service call origination – radio resources available, call not queued . 17
5.2 Priority service call termination – radio resources available, call not queued . 19
5.3 Priority service call origination – radio resources unavailable, call queued . 21
5.4 Priority service call termination – radio resources unavailable, call queued . 22
5.5 Priority service call origination – radio resources unavailable and queue full . 24
5.6 Priority service call termination – radio resources unavailable and queue full . 25
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3GPP TR 22.952 version 15.0.0 Release 15 4 ETSI TR 122 952 V15.0.0 (2018-07)
5.7 Priority service call origination – radio resources unavailable and queue timeout . 26
5.8 Priority service call termination – radio resources unavailable and queue timeout . 27
5.9 Priority service call origination – radio resources unavailable and queue full, but higher priority . 27
5.10 Priority service call termination – radio resources unavailable and queue full, but higher priority . 28
5.11 Priority service call progression – MSC – outgoing trunk queuing. 29
5.12 Priority service call progression – MSC – outgoing trunk queuing – timeout . 30
5.13 Priority service call attempt by a non-service-user – Priority service denied . 31
6 Operations, administration, maintenance, and provisioning . 32
6.1 Priority level assignment . 32
6.2 Subscription management . 32
6.3 Accounting / charging . 33
6.4 Service provider responsibility . 33
6.5 Service user responsibility . 33
Annex A: Region specific aspects . 34
A.1 U.S.A. specific aspects . 34
A.1.1 Priority level assignment . 34
A.1.2 Call origination / invocation . 34
A.1.3 Mapping of priority indicators . 34
A.1.4 Signalling of priority indicators . 35
A.1.5 Feature interactions . 37
A.1.5.1 eMLPP . 37
A.1.6 Software access control . 37
Annex B: Use cases . 38
B.1 Priority service call to Priority service subscriber in Priority service + eMLPP network . 39
B.2 eMLPP call to eMLPP subscriber in Priority service + eMLPP network . 40
B.3 Priority service call to eMLPP subscriber in Priority service only network . 41
B.4 Normal call to eMLPP subscriber in Priority service only network. 42
B.5 eMLPP call to Priority service subscriber in Priority service + eMLPP network . 43
B.6 eMLPP call to eMLPP subscriber in Priority service + eMLPP network . 44
B.7 Normal call to normal subscriber in Priority service + eMLPP network . 45
B.8 An eMLPP subscriber roams to a Priority service + eMLPP network and initiates a call with the
Priority service service code . 46
B.9 Priority call to a subscriber in an eMLPP only network . 47
Annex C: Distinguishing Priority Service users and eMLPP users . 48
Annex D (informative): UTRAN to GERAN Redirection . 51
D.1 MO UTRAN to MT UTRAN call . . 51
D.2 MO UTRAN to MT (UTRAN to GERAN reversion) call . 51
D.3 MO UTRAN to Trunk call . 51
D.4 MO (UTRAN to GERAN reversion) to MT UTRAN call . 51
D.5 MO (UTRAN to GERAN reversion) to MT (UTRAN to GERAN reversion) call . 51
D.6 MO (UTRAN to GERAN reversion) to Trunk call . 51
D.7 Incoming NS/EP (trunk) to MT UTRAN call . 52
D.8 Incoming NS/EP (trunk) to MT (UTRAN to GERAN reversion) call . 52
D.9 MO UTRAN to MT (UTRAN to GERAN reversion) call, exception UE single mode . 52
D.10 MO UTRAN to MT (UTRAN to GERAN reversion) call, exception only UTRAN Subscription . 52
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3GPP TR 22.952 version 15.0.0 Release 15 5 ETSI TR 122 952 V15.0.0 (2018-07)
Annex E: Change history . 53
History . 54
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3GPP TR 22.952 version 15.0.0 Release 15 6 ETSI TR 122 952 V15.0.0 (2018-07)
Foreword
rd
This Technical Report has been produced by the 3 Generation 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 the 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 under 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.
Introduction
This Technical Report (TR) provides a "Guide" for Priority Service. The intent of this "Guide" is to describe how
existing 3GPP specifications support the high-level requirements identified for Priority Service in TR 22.950.
Priority Service allows qualified and authorized users to obtain priority access to available radio (voice or data traffic)
resources on a priority basis before other PLMN users during situations when PLMN congestion is blocking call
attempts. In addition, Priority Service supports priority call progression and call completion to support an "end-to-end"
priority call.
Priority Service is intended to be used by qualified and authorized users, i.e., key emergency service personnel and
those with leadership responsibilities, only during times of emergency situations and network congestion. Priority
Service providers should adhere to uniform, nationwide operating access procedures.
Priority Service is to be available at all times in equipped markets in both the HPLMN and VPLMN within a country
where a PLMN provider is offering the service. Priority Service is applicable to both GERAN and UTRAN and is
activated on a per call basis using Priority Service dialling procedures.
Priority Service, supported by the 3GPP system set of services and features, is one element in the ability to deliver calls
of a high priority nature from mobile to mobile networks, mobile to fixed networks, and fixed to mobile networks.
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3GPP TR 22.952 version 15.0.0 Release 15 7 ETSI TR 122 952 V15.0.0 (2018-07)
1 Scope
This present document addresses the Service Aspects (Service Description), Network Aspects (Call Flows), and
Management Aspects (Operations, Administration, Maintenance, and Provisioning) of Priority Service, based on
existing 3GPP specifications.
The Priority Service is intended to be used for both Voice and Data. However, this document only addresses Circuit
Switched Voice Service. Data, multimedia and non-circuit switched aspects of Priority Service have not been addressed
and are for further study.
The Priority Service is intended to interwork with external networks to provide an end-to-end service. Therefore,
service interactions with external networks are considered within the scope of this document, although the specification
of these interactions may be in another standard. If this occurs, a reference to that specification is made.
2 References
The following documents contain provisions which, 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 latest 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.
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3GPP TR 22.952 version 15.0.0 Release 15 8 ETSI TR 122 952 V15.0.0 (2018-07)
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TR 22.950: "Priority service feasibility study".
[3] 3GPP TS 22.011: "Service accessibility".
[4] 3GPP TS 22.067: "enhanced Multi-Level Precedence and Pre-emption service (eMLPP); Stage 1".
[5] 3GPP TS 23.067: "Enhanced Multi-Level Precedence and Pre-emption Service (eMLPP);
Stage 2".
[6] 3GPP TS 24.067: "Enhanced Multi-Level Precedence and Pre-emption service (eMLPP); Stage 3".
[7] 3GPP TS 51.011: "Specification of the Subscriber Identity Module - Mobile Equipment (SIM-ME)
interface".
[8] 3GPP TS 31.102: "Characteristics of the USIM application".
[9] 3GPP TS 48.008: "Mobile-services Switching Centre - Base Station system (MSC-BSS) Interface
Layer 3 Specification".
[10] Alliance for Telecommunications Industry Solutions (ATIS) T1.111-2001: Signaling System No.7,
Message Transfer Part.
[11] ATIS T1.631-1993 (R1999): High Probability of Completion HPC Network Capability.
[12] ATIS T1.113-2000: Signalling System No. 7 (SS7) - Integrated Services Digital Network (ISDN)
User Part (Revision of T1.113-1995; includes two Supplements: T1.113a-2000 & T1.113b-2001).
[13] Federal Communications Commission (FCC) Second Report and Order (R&O) 00-242 (WT
Docket No. 96-86).
[14] ITU-T Recommendation Q.764, Signalling System No. 7 – ISDN user part signalling procedures.
3 Definitions and abbreviations
Refer to [1] for additional definitions and abbreviations used in this document that are not defined below.
3.1 Definitions
Service User: subscriber to Priority Service
Service Provider: provider of Priority Service
3.2 Abbreviations
ATIS Alliance for Telecommunications Industry Solutions
IEPS International Emergency Preference Scheme
4 Service description
4.1 Assumptions and limitations
Priority Service is a subscription service, based on eMLPP service, as described in the Priority Service feasibility study,
3GPP TR 22.950 [2]. There are no Stage 1, Stage 2, Stage 3 specifications for Priority Service. Only eMLPP Release 6
specifications have been updated to be compatible with Priority Service. The following primary 3GPP capabilities were
identified in [2] to support Priority Service:
• Service Accessibility, as specified in 3GPP TS 22.011 [3],
• Enhanced Multi-Level Precedence and Pre-emption (eMLPP), as specified in 3GPP TS 22.067 [4], 3GPP TS
23.067 [5], and 3GPP TS 24.067 [6],
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3GPP TR 22.952 version 15.0.0 Release 15 9 ETSI TR 122 952 V15.0.0 (2018-07)
• Subscriber Identity Module (SIM), as specified in 3GPP TS 51.011 [7],
• Universal Subscriber Identity Module (USIM), as specified in 3GPP TS 31.102 [8],
• Priority Information Element, as specified in 3GPP TS 48.008 [9].
The following assumptions have been made to provide for Priority Service.
For the purposes of this document, the term "Service User" is a subscriber to Priority Service and a "Service Provider"
is a provider of Priority Service.
No hardware or software modifications to existing Mobile Stations (MS) have been identified as required to support
Priority Service. Priority Service subscribers may use MSs supporting the Adaptive Multi Rate (AMR), Enhanced Full
Rate (EFR) and basic full rate voice codecs.
The ISDN User Part (ISUP) Precedence parameter used in the Multi-Level Precedence and Pre-emption (MLPP)
service may be used to transmit the priority of the calling Service User through any transit networks to the terminating
network.
4.2 Registration / erasure
The eMLPP registration and erasure procedures are not applicable for the Priority Service.
4.3 Interrogation
The eMLPP interrogation procedure is not applicable for the Priority Service.
4.4 Call origination / invocation
Service Users are the only subscribers that are allowed to invoke Priority Service. Priority Service is invoked on a per
call basis.
4.4.1 Service accessibility
Service Accessibility, as specified in [3], supports an "Access Control" capability used by network operators to prevent
overload of radio access channels under critical conditions. Access Class load shedding may be applied to a specified
localized area and for a specified duration. Invoking access control does not pre-empt calls in progress.
For priority access to the network, a Service User receives treatment that is fully compliant with Service Accessibility
capabilities with the following exceptions, extensions, or clarifications:
A call receives end-to-end priority treatment, including priority access to traffic channels on the originating side, when a
Service User initiates a call using the Priority Service dialling procedure:
*Service Code (SC) + Destination Number.
A generic prefix may be used in place of "*SC".
A Service User is assigned Access Class(es) in the range of 11 – 15 to receive priority access to the network.
Support of Localized Service Area for Priority Service is not required.
4.4.2 Priority radio resource queuing
If a Service User invokes a Priority Service call and a radio traffic channel is available to serve the call, then call
establishment proceeds.
If a Service User invokes a Priority Service call and a radio traffic channel is not available to serve the call, then the call
is queued for the next available radio traffic channel according to the call’s priority level and the arrival time.
If a Service User invokes a Priority Service call, a radio traffic channel is not available to serve the call, the queue for
the cell is full, and the call’s priority level is greater than the priority level of the lowest priority reques
...