ETSI EN 300 392-12-16 V1.4.1 (2026-07)

Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 12: Supplementary services stage 3; Sub-part 16: Pre-emptive Priority Call (PPC)

REN/TCCE-03278

Prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - 12. del: Dopolnilne storitve stopnje 3 - 16. poddel: Prednostni klic s predpravico (PPC)

General Information

• Status: Not Published
• Technical Committee: TCCE 3 - TCCE Air Interface and Network Protocols
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Due Date: 17-Jul-2026
• Completion Date: 03-Jul-2026
• Ref Project: SIST EN 300 392-12-16 V1.4.1:2026 - Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary services stage 3 - Sub-part 16: Pre-emptive Priority Call (PPC)

Standards Content (Sample)

DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)

EUROPEAN STANDARD
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 12: Supplementary services stage 3;
Sub-part 16: Pre-emptive Priority Call (PPC)

2 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)

Reference
REN/TCCE-03278
Keywords
data, radio, speech, stage 3, supplementary
service, TETRA, V+D
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ETSI
3 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 10
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 11
3.3 Abbreviations . 11
4 SS-PPC service primitives. 11
4.1 General . 11
4.2 SS-PPC services offered over the TNSS-SAP. 11
4.2.0 General . 11
4.2.1 DEFINE request . 12
4.2.2 DEFINE confirm . 13
4.2.3 ASSIGN indication . 13
4.2.4 ASSIGN response . 13
4.2.5 INTERROGATE request . 14
4.2.6 INTERROGATE confirm . 14
4.2.7 REMOVE indication. 14
4.2.8 REMOVE response. 15
4.2.9 WITHDRAW request . 15
4.2.10 WITHDRAW confirm . 15
4.2.11 IMPENDING-PRE-EMPTION indication . 15
4.2.12 USER-PRE-EMPTED indication . 16
4.3 SS-PPC services offered over the TNCC-SAP . 16
4.3.0 General . 16
4.3.1 PRIORITY1 request - SS-PPC invocation . 16
4.3.2 PRIORITY2 confirm/indication - SS-PPC operation . 16
4.3.3 PRE-EMPTION . 17
4.4 Parameter descriptions . 17
5 SS-PPC protocol description . . 19
5.1 General . 19
5.2 SS-PPC protocol states . 19
5.2.0 General . 19
5.2.1 Protocol states of FE1 . 19
5.2.2 Protocol states of CCA to which FE1 is collocated . 20
5.2.2.1 State IDLE. 20
5.2.2.2 MO-CALL-SETUP . 20
5.2.3 Protocol states of FE21 . 20
5.2.3.0 General . 20
5.2.3.1 State IDLE. 20
5.2.4 Protocol states of CC to which FE21 is collocated . 20
5.2.4.0 General . 20
5.2.4.1 State ANY-STATE . 21
5.2.4.2 State PARTIES-PRE-EMPTED . 21
5.2.4.3 State SETUP-STARTED . 22
5.2.5 Protocol states of FE3 . 22
5.2.6 Protocol states of visited SwMI FE25. 22
5.2.7 Protocol states of CC to which FE25 is collocated . 22
5.2.7.0 General . 22
5.2.7.1 State ANY-STATE . 23
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4 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
5.2.7.2 State PARTIES-PRE-EMPTED . 23
5.2.7.3 State SETUP-STARTED . 23
5.2.8 Protocol states of FE5 . 24
5.2.9 Protocol states of CCA to which FE5 is collocated . 24
5.2.9.1 ANY STATE. 24
5.2.9.2 MT-CALL-SETUP . 24
5.2.10 Protocol states of FE8 . 25
5.2.11 Protocol states of CCA to which FE8 is collocated . 25
5.3 SS-PPC signalling procedures . 25
5.3.0 General . 25
5.3.1 Procedures for FE1 . 25
5.3.2 Procedures for FE21 . 25
5.3.2.1 Definition in FE21 . 25
5.3.2.2 Distribution in FE21 . 26
5.3.2.3 Interrogation in FE21 . 26
5.3.3 Procedures for CC to which FE21 is collocated . 27
5.3.3.1 Verify priority in CC to which FE21 is collocated . 27
5.3.4 Procedures for FE3 . 27
5.3.4.1 Verification in FE3 . 27
5.3.5 Procedures for visited SwMI FE25 . 27
5.4 PDU descriptions . 28
5.4.0 General . 28
5.4.1 ASSIGN PDU . 28
5.4.2 ASSIGN ACK PDU. 29
5.4.3 DEFINE PDU . 29
5.4.4 DEFINE ACK PDU . 30
5.4.5 INTERROGATE PDU . 30
5.4.6 INTERROGATE-ACK PDU . 31
5.4.7 REMOVE PDU . 31
5.4.8 REMOVE ACK PDU . 31
5.4.9 WITHDRAW PDU . 32
5.4.10 WITHDRAW ACK PDU . 32
5.4.11 Pre-emption. 32
5.4.11.1 D-RELEASE PDU . 32
5.4.12 Priority 1 and Priority 2 . 32
5.4.12.1 D-CONNECT PDU . 32
5.4.12.2 D-SETUP PDU . 32
5.4.12.3 U-SETUP PDU . 33
5.4.13 IMPENDING-PRE-EMPTION PDU . 33
5.4.14 USER-PRE-EMPTED PDU . 33
5.5 Information element coding . 33
5.5.0 General . 33
5.5.1 Basic service(s) . 33
5.5.2 Number of pre-empted parties . 34
5.5.3 Number of SS-PPC definitions . 34
5.5.4 PPC PDU type . 35
5.5.5 Pre-empted party . 35
5.5.6 Range type . 36
5.5.7 Result for definition . 36
5.5.8 Result for interrogation . 37
5.5.9 Result for withdrawal. 37
5.5.10 SS-PPC assignment . 37
5.5.11 SS-PPC definition . 38
5.5.12 SS-PPC priority, Call priority and Non group member SS-PPC priority . 38
5.5.13 Subscriber extension present. 38
5.5.14 Subscriber identity . 39
5.5.15 Time to pre-emption . 39
6 SS-PPC FE behaviour . 39
6.0 General . 39
6.1 Behaviour of FE1 (SS entity of user A) . 40
6.1.1 Service interaction for FE1 . 40
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5 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
6.1.2 Process description for FE1 . 41
6.2 Behaviour of CCA to which FE1 is collocated . 42
6.2.1 Service interaction for CCA to which FE1 is collocated . 42
6.2.2 Process description for CCA to which FE1 is collocated . 43
6.3 Behaviour of FE21 . 44
6.3.1 Service interaction for FE21 . 44
6.3.2 Process description for FE21 . 45
6.4 Behaviour of CC to which FE21 is collocated . 46
6.4.1 Service interaction for CC to which FE21 is collocated . 46
6.4.2 Process description for CC to which FE21 is collocated . 47
6.5 Behaviour of FE3 (SS entity of authorized user). 50
6.5.1 Service interaction for FE3 . 50
6.5.2 Process description for FE3 . 51
6.6 Behaviour of visited SwMI FE25 . 52
6.6.1 Service interaction for FE25 . 52
6.6.2 Process description for visited SwMI FE25 . 53
6.7 Behaviour of CC to which FE25 is collocated . 54
6.8 Behaviour of FE5 . 55
6.8.1 Service interaction for FE5 . 55
6.8.2 Process description for FE5 . 56
6.9 Behaviour of CCA to which FE5 is collocated . 57
6.9.0 General . 57
6.9.1 Service interaction for CCA to which FE5 is collocated . 57
6.9.2 Process description for CCA collocated to FE5 . 58
6.10 Behaviour of FE8 . 60
6.10.1 Service interaction for FE8 . 60
6.10.2 Process description for FE8 . 61
6.11 Behaviour of CCA to which FE8 is collocated . 62
6.11.1 Service interaction for CCA to which FE8 is collocated . 62
6.11.2 Process description for CCA collocated to FE8 . 63
6.12 Inter-working considerations . 63
Annex A (informative): Mapping of SS-PPC priorities received from the user application to
priorities in basic service PDUs (for the MS) . 64
Annex B (informative): Bibliography . 65
Annex C (informative): Change requests . 66
History . 67

ETSI
6 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
Intellectual Property Rights
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Foreword
This draft European Standard (EN) has been produced by ETSI Technical Committee TETRA and Critical
Communications Evolution (TCCE), and is now submitted for the combined Public Enquiry and Vote phase of the
ETSI EN Approval Procedure (ENAP).

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

The present document is part 12, sub-part 16 of a multi-part deliverable covering Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D), as identified below:
Part 1: "General network design";
Part 2: "Air Interface (AI)";
Part 3: "Interworking at the Inter-System Interface (ISI)":
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 7: "Security";
Part 9: "General requirements for supplementary services";
ETSI
7 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
Part 10: "Supplementary services stage 1";
Part 11: "Supplementary services stage 2";
Part 12: "Supplementary services stage 3";
Sub-part 1: "Call Identification (CI)";
Sub-part 2: "Call Report (CR)";
Sub-part 3: "Talking Party Identification (TPI)";
Sub-part 4: "Call Forwarding (CF)";
Sub-part 5: "List Search Call (LSC)";
Sub-part 6: "Call Authorized by Dispatcher (CAD)";
Sub-part 7: "Short Number Addressing (SNA)";
Sub-part 8: "Area Selection (AS)";
Sub-part 9: "Access Priority (AP)";
Sub-part 10: "Priority Call (PC)";
Sub-part 11:"Call Waiting (CW)";
Sub-part 12: "Call Hold (HOLD)";
Sub-part 13: "Call Completion to Busy Subscriber (CCBS)";
Sub-part 14: "Late Entry (LE)";
Sub-part 16: "Pre-emptive Priority Call (PPC)";
Sub-part 17: "Include Call (IC)";
Sub-part 18: "Barring of Outgoing Calls (BOC)";
Sub-part 19: "Barring of Incoming Calls (BIC)";
Sub-part 20: "Discreet Listening (DL)";
Sub-part 21: "Ambience Listening (AL)";
Sub-part 22: "Dynamic Group Number Assignment (DGNA)";
Sub-part 23: "Call Completion on No Reply (CCNR)";
Sub-part 24:"Call Retention (CRT)";
Part 13: "SDL model of the Air Interface (AI)";
Part 14: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 15: "TETRA frequency bands, duplex spacings and channel numbering";
Part 16: "Network Performance Metrics";
Part 17: "TETRA V+D and DMO specifications";
Part 18: "Air interface optimized applications";
Part 19: "Interworking between TETRA and Broadband systems".
NOTE 1: Part 3, sub-parts 6 and 7 (Speech format implementation), part 4, sub-part 3 (Data networks gateway),
part 10, sub-part 15 (Transfer of control), part 13 (SDL) and part 14 (PICS) of this multi-part deliverable
are in status "historical" and are not maintained.
ETSI
8 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
NOTE 2: Some parts are also published as Technical Specifications such as ETSI TS 100 392-2 and those may be
the latest version of the document.
Modal verbs terminology
In the present document "shall", "shall not", "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
9 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
1 Scope
The present document defines the stage 3 specifications of the Supplementary Service Pre-emptive Priority Call
(SS-PPC) for the Terrestrial Trunked Radio (TETRA).
SS-PPC enables a user to have preferential access to the network resources in a TETRA system in times of congestion
including pre-emption of calls. SS-PPC is applicable for pre-emptive priorities including the emergency priority.
SS-PPC includes the capability to pre-empt resources needed for higher priority calls and the capability to pre-empt
users from ongoing calls in order to move them to higher priority calls. SS-PPC specifies the definition, activation,
deactivation and interrogation for the usage of pre-emptive call priorities in the TETRA system. The Switching and
Management Infrastructure (SwMI) applies the SS-PPC priorities when it allocates the resources for calls. The SS-PPC
operations are defined for the SwMI and for the Mobile Station (MS).
SS-PPC is defined to subscribers of one TETRA system, but the subscribers may be located in several TETRA systems
and the information flows may be delivered over the Inter System Interface (ISI). SS-PPC is invoked for calls within
one TETRA system or for calls that extend over ISI to several TETRA systems.
Man-Machine Interface (MMI) and charging principles are outside the scope of the present document.
Supplementary Service stage 3 specification is preceded by the stage 1 and the stage 2 specifications of the service.
Stage 1 describes the functional capabilities from the user's point of view. Stage 2 defines the functional behaviour in
terms of Functional Entities (FEs) and information flows. Stage 3 gives a precise description of the supplementary
service from the implementation point of view. It defines the protocol for the service and the encoding rules for the
information flows. It defines the processes for the FEs and their behaviour. The described protocols and behaviour
apply to the SwMI, for the MS and may be applied over the ISI between TETRA systems. Aspects relating to all
supplementary services are detailed in ETSI EN 300 392-9 [3].
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air
Interface (AI)".
[2] ETSI EN 300 392-1 (V1.2.1): "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 1: General network design".
[3] ETSI EN 300 392-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 9: General requirements for supplementary services".
[4] ETSI EN 300 392-3-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 1: General design".
[5] Recommendation ITU-T Z.100: "Specification and Description Language - Overview of
SDL-2010".
ETSI
10 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
[6] ETSI EN 300 392-12-10: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 12: Supplementary services stage 3; Sub-part 10: Priority Call (PC)".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents may be useful in implementing an ETSI deliverable or add to the reader's
understanding, but are not required for conformance to the present document.
Not applicable.
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
authorized user: user who is authorized to define, activate, deactivate and interrogate SS-PPC
Call Control Agent (CCA): Call Control sub-entity for Supplementary Service Pre-emptive Priority Call in Circuit
Mode Control Entity in Mobile Station
emergency priority: highest pre-emptive priority level
Functional Entity (FE): functional characteristics of the SS sub-entity within an MS or a SwMI related to an SS-PPC
action, e.g. definition or invocation
SS-PPC call: basic service (call) to which the defined SS-PPC priority is applied
SS-PPC invocation: sending of priority request to infrastructure
NOTE: The SS-PPC invocation is done with the basic service invocation request.
SS-PPC operation: usage of SS-PPC priority for and in a basic service set-up
SS-PPC pre-emption: exclusion of one or more parties from an ongoing basic service due an SS-PPC operation for
another basic service
NOTE: The pre-emption may be done due to the lack of resources or due to the need to join a called party to a
higher priority pre-emptive call.
SS-PPC priority: any pre-emptive priority invoked and operated for an SS-PPC call
user A: calling party, the party that invokes or generates invocation of SS-PPC
user B: called party in a call in which SS-PPC is operated
user C: pre-empted user, a user that is involved in a call, which is pre-empted due to lack of resources for a SS-PPC
NOTE: There may be one, two or more pre-empted users due to a pre-empted call.
user D: remaining user or users in a call from which a user or users have been pre-empted
ETSI
11 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
visited SwMI: TETRA system of which the Mobile Network Identity (MNI) is not equal to the MNI of the user
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CC Call Control sub-entity for SS-PPC in CMCE in SwMI
CCA Call Control Agent
CMCE Circuit Mode Control Entity
FE Functional Entity
GTSI Group TETRA Subscriber Identity
ISI Inter System Interface
ITSI Individual TETRA Subscriber Identity
MCC Mobile Country Code
MNC Mobile Network Code
MNI Mobile Network Identity
MS Mobile Station
PDU Protocol Data Unit
SS Supplementary Service sub-entity within CMCE
SSI Short Subscriber Identity
SS-PPC Supplementary Service Pre-emptive Priority Call
SwMI Switching and Management Infrastructure
TETRA TErrestrial Trunked RAdio
TNCC-SAP TETRA Network layer Call Control Service Access Point
TNSS-SAP TETRA Network layer Supplementary Service Service Access Point
TSI TETRA Subscriber Identity
4 SS-PPC service primitives
4.1 General
This clause describes the SS-PPC services offered by Supplementary Service (SS) and call control sub entities of
CMCE of the TETRA voice plus data layer 3 service boundary in the MS. The SS-PPC services shall be offered at the
Supplementary Service Service Access Point (TNSS-SAP) and the Call Control Service Access Point (TNCC-SAP).
The SS-PPC services described in this clause shall be applicable for the MS.
NOTE: The SS-PPC services within the SwMI are outside the scope of the present document.
The SS-PPC services specified in the present document shall complement the Supplementary services and Call control
services specified in ETSI EN 300 392-2 [1], clauses 12 and 11 respectively and the Supplementary Services general
design standard ETSI EN 300 392-9 [3]. The SS-PPC services shall act as sub-services within the general
supplementary services and call control services.
SS-PPC shall be an optional supplementary service for TETRA voice plus data layer 3. If SS-PPC is supported, this
clause shall specify the services and their availability.
4.2 SS-PPC services offered over the TNSS-SAP
4.2.0 General
When the optional SS-PPC definition, user definition, activation, deactivation, interrogation, impending pre-emption
indication and pre-empted party indication are supported, they shall be provided at TNSS-SAP.
ETSI
12 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
NOTE: As the present document only deals with the SS-PPC all the service primitives have been shown without a
TNSS-PPC-prefix e.g. the TNSS-PPC-ASSIGN request is shortened into an ASSIGN request.
The SS-PPC primitives for the user A (FE1) at the MS TNSS-SAP shall be:
a) INTERROGATE request;
b) INTERROGATE indication;
c) ASSIGN indication;
d) ASSIGN response.
The SS-PPC primitives for the authorized user (FE3) at the MS TNSS-SAP shall be:
a) DEFINE request;
b) DEFINE indication;
c) INTERROGATE request;
d) INTERROGATE indication.
The SS-PPC primitives for the pre-empted called user (FE5) at the MS TNSS-SAP shall be:
a) IMPENDING-PRE-EMPTION indication.
The SS-PPC primitives for the pre-empted user (FE8) at the MS TNSS-SAP shall be:
a) IMPENDING-PRE-EMPTION indication.
The SS-PPC primitives for the user (FE9) remaining in a call after pre-emption at the MS TNSS-SAP shall be:
a) USER-PRE-EMPTED indication.
The activation and deactivation shall be done with the DEFINE request; the acknowledgement for activation and
deactivation shall be done with DEFINE indication.
The information contained in the following primitive description tables correspond to the following key:
- Remark: comment;
- C: conditional;
- O: optional;
- M: mandatory.
4.2.1 DEFINE request
Optional DEFINE request primitive may be offered from the user application to FE3 over TNSS-SAP. The primitive
shall contain the SS-PPC information parameters listed in table 1.
The subscriber identity parameter(s) shall indicate the subscriber identities on which the following definition shall be
made.
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13 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)
Table 1: DEFINE request contents
Parameter Request Remark
Subscriber identity M Repeatable
Activated/deactivated M Note 1
Basic service M Repeatable
SS-PPC priority M Repeatable
Delivered to user A(s) M
Acknowledgement from user A(s) C Note 2
NOTE 1: Shall be used to indicate whether or not this PDU is used to
activate a new PPC value or to deactivate an existing PPC
value. When a PPC value is de-activated, a pre-programmed
default value may then apply.
NOTE 2: Conditional on the information element "Delivered to user A(s)".

4.2.2 DEFINE confirm
If DEFINE request primitive is supported, then DEFINE confirm primitive shall be offered from FE3 to the user
application over TNSS-SAP as an acknowledgement to a previously made definition request. The primitive shall
contain the SS-PPC information parameters listed in table 2.
The Result for definition parameter shall indicate the result for all listed subscriber numbers and all basic service types.
NOTE 1: If the acknowledgements are different for different subscriber identities, FE3 may deliver several
DEFINE confirm primitives to the user applicati
...

EUROPEAN STANDARD
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 12: Supplementary services stage 3;
Sub-part 16: Pre-emptive Priority Call (PPC)

2 ETSI EN 300 392-12-16 V1.4.1 (2026-07)

Reference
REN/TCCE-03278
Keywords
data, radio, speech, stage 3,
supplementary service, TETRA, V+D
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All rights reserved.
ETSI
3 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 10
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 11
3.3 Abbreviations . 11
4 SS-PPC service primitives. 11
4.1 General . 11
4.2 SS-PPC services offered over the TNSS-SAP. 12
4.2.0 General . 12
4.2.1 DEFINE request . 12
4.2.2 DEFINE confirm . 13
4.2.3 ASSIGN indication . 13
4.2.4 ASSIGN response . 13
4.2.5 INTERROGATE request . 14
4.2.6 INTERROGATE confirm . 14
4.2.7 REMOVE indication. 14
4.2.8 REMOVE response. 15
4.2.9 WITHDRAW request . 15
4.2.10 WITHDRAW confirm . 15
4.2.11 IMPENDING-PRE-EMPTION indication . 15
4.2.12 USER-PRE-EMPTED indication . 16
4.3 SS-PPC services offered over the TNCC-SAP . 16
4.3.0 General . 16
4.3.1 PRIORITY1 request - SS-PPC invocation . 16
4.3.2 PRIORITY2 confirm/indication - SS-PPC operation . 16
4.3.3 PRE-EMPTION . 16
4.4 Parameter descriptions . 16
5 SS-PPC protocol description . . 19
5.1 General . 19
5.2 SS-PPC protocol states . 19
5.2.0 General . 19
5.2.1 Protocol states of FE1 . 19
5.2.2 Protocol states of CCA to which FE1 is collocated . 19
5.2.2.1 State IDLE. 19
5.2.2.2 MO-CALL-SETUP . 19
5.2.3 Protocol states of FE21 . 20
5.2.3.0 General . 20
5.2.3.1 State IDLE. 20
5.2.4 Protocol states of CC to which FE21 is collocated . 20
5.2.4.0 General . 20
5.2.4.1 State ANY-STATE . 20
5.2.4.2 State PARTIES-PRE-EMPTED . 21
5.2.4.3 State SETUP-STARTED . 21
5.2.5 Protocol states of FE3 . 22
5.2.6 Protocol states of visited SwMI FE25. 22
5.2.7 Protocol states of CC to which FE25 is collocated . 22
5.2.7.0 General . 22
5.2.7.1 State ANY-STATE . 22
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4 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
5.2.7.2 State PARTIES-PRE-EMPTED . 23
5.2.7.3 State SETUP-STARTED . 23
5.2.8 Protocol states of FE5 . 23
5.2.9 Protocol states of CCA to which FE5 is collocated . 24
5.2.9.1 ANY STATE. 24
5.2.9.2 MT-CALL-SETUP . 24
5.2.10 Protocol states of FE8 . 24
5.2.11 Protocol states of CCA to which FE8 is collocated . 25
5.3 SS-PPC signalling procedures . 25
5.3.0 General . 25
5.3.1 Procedures for FE1 . 25
5.3.2 Procedures for FE21 . 25
5.3.2.1 Definition in FE21 . 25
5.3.2.2 Distribution in FE21 . 25
5.3.2.3 Interrogation in FE21 . 26
5.3.3 Procedures for CC to which FE21 is collocated . 26
5.3.3.1 Verify priority in CC to which FE21 is collocated . 26
5.3.4 Procedures for FE3 . 27
5.3.4.1 Verification in FE3 . 27
5.3.5 Procedures for visited SwMI FE25 . 27
5.4 PDU descriptions . 27
5.4.0 General . 27
5.4.1 ASSIGN PDU . 28
5.4.2 ASSIGN ACK PDU. 28
5.4.3 DEFINE PDU . 29
5.4.4 DEFINE ACK PDU . 29
5.4.5 INTERROGATE PDU . 29
5.4.6 INTERROGATE-ACK PDU . 30
5.4.7 REMOVE PDU . 30
5.4.8 REMOVE ACK PDU . 30
5.4.9 WITHDRAW PDU . 31
5.4.10 WITHDRAW ACK PDU . 31
5.4.11 Pre-emption. 31
5.4.11.1 D-RELEASE PDU . 31
5.4.12 Priority 1 and Priority 2 . 31
5.4.12.1 D-CONNECT PDU . 31
5.4.12.2 D-SETUP PDU . 31
5.4.12.3 U-SETUP PDU . 32
5.4.13 IMPENDING-PRE-EMPTION PDU . 32
5.4.14 USER-PRE-EMPTED PDU . 32
5.5 Information element coding . 32
5.5.0 General . 32
5.5.1 Basic service(s) . 32
5.5.2 Number of pre-empted parties . 33
5.5.3 Number of SS-PPC definitions . 33
5.5.4 PPC PDU type . 34
5.5.5 Pre-empted party . 34
5.5.6 Range type . 35
5.5.7 Result for definition . 35
5.5.8 Result for interrogation . 35
5.5.9 Result for withdrawal. 36
5.5.10 SS-PPC assignment . 36
5.5.11 SS-PPC definition . 36
5.5.12 SS-PPC priority, Call priority and Non group member SS-PPC priority . 37
5.5.13 Subscriber extension present. 37
5.5.14 Subscriber identity . 37
5.5.15 Time to pre-emption . 38
6 SS-PPC FE behaviour . 38
6.0 General . 38
6.1 Behaviour of FE1 (SS entity of user A) . 39
6.1.1 Service interaction for FE1 . 39
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5 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
6.1.2 Process description for FE1 . 40
6.2 Behaviour of CCA to which FE1 is collocated . 41
6.2.1 Service interaction for CCA to which FE1 is collocated . 41
6.2.2 Process description for CCA to which FE1 is collocated . 42
6.3 Behaviour of FE21 . 43
6.3.1 Service interaction for FE21 . 43
6.3.2 Process description for FE21 . 44
6.4 Behaviour of CC to which FE21 is collocated . 45
6.4.1 Service interaction for CC to which FE21 is collocated . 45
6.4.2 Process description for CC to which FE21 is collocated . 46
6.5 Behaviour of FE3 (SS entity of authorized user). 49
6.5.1 Service interaction for FE3 . 49
6.5.2 Process description for FE3 . 50
6.6 Behaviour of visited SwMI FE25 . 51
6.6.1 Service interaction for FE25 . 51
6.6.2 Process description for visited SwMI FE25 . 52
6.7 Behaviour of CC to which FE25 is collocated . 53
6.8 Behaviour of FE5 . 54
6.8.1 Service interaction for FE5 . 54
6.8.2 Process description for FE5 . 55
6.9 Behaviour of CCA to which FE5 is collocated . 56
6.9.0 General . 56
6.9.1 Service interaction for CCA to which FE5 is collocated . 56
6.9.2 Process description for CCA collocated to FE5 . 57
6.10 Behaviour of FE8 . 59
6.10.1 Service interaction for FE8 . 59
6.10.2 Process description for FE8 . 60
6.11 Behaviour of CCA to which FE8 is collocated . 61
6.11.1 Service interaction for CCA to which FE8 is collocated . 61
6.11.2 Process description for CCA collocated to FE8 . 62
6.12 Inter-working considerations . 62
Annex A (informative): Mapping of SS-PPC priorities received from the user application to
priorities in basic service PDUs (for the MS) . 63
Annex B (informative): Bibliography . 64
Annex C (informative): Change requests . 65
History . 66

ETSI
6 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
Intellectual Property Rights
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Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
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essential to the present document.
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Foreword
This European Standard (EN) has been produced by ETSI Technical Committee TETRA and Critical Communications
Evolution (TCCE).
National transposition dates
Date of adoption of this EN: 3 July 2026
Date of latest announcement of this EN (doa): 31 October 2026
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 April 2027
Date of withdrawal of any conflicting National Standard (dow): 30 April 2027

The present document is part 12, sub-part 16 of a multi-part deliverable covering Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D), as identified below:
Part 1: "General network design";
Part 2: "Air Interface (AI)";
Part 3: "Interworking at the Inter-System Interface (ISI)";
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 7: "Security";
ETSI
7 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
Part 9: "General requirements for supplementary services";
Part 10: "Supplementary services stage 1";
Part 11: "Supplementary services stage 2";
Part 12: "Supplementary services stage 3";
Sub-part 1: "Call Identification (CI)";
Sub-part 2: "Call Report (CR)";
Sub-part 3: "Talking Party Identification (TPI)";
Sub-part 4: "Call Forwarding (CF)";
Sub-part 5: "List Search Call (LSC)";
Sub-part 6: "Call Authorized by Dispatcher (CAD)";
Sub-part 7: "Short Number Addressing (SNA)";
Sub-part 8: "Area Selection (AS)";
Sub-part 9: "Access Priority (AP)";
Sub-part 10: "Priority Call (PC)";
Sub-part 11: "Call Waiting (CW)";
Sub-part 12: "Call Hold (HOLD)";
Sub-part 13: "Call Completion to Busy Subscriber (CCBS)";
Sub-part 14: "Late Entry (LE)";
Sub-part 16: "Pre-emptive Priority Call (PPC)";
Sub-part 17: "Include Call (IC)";
Sub-part 18: "Barring of Outgoing Calls (BOC)";
Sub-part 19: "Barring of Incoming Calls (BIC)";
Sub-part 20: "Discreet Listening (DL)";
Sub-part 21: "Ambience Listening (AL)";
Sub-part 22: "Dynamic Group Number Assignment (DGNA)";
Sub-part 23: "Call Completion on No Reply (CCNR)";
Sub-part 24: "Call Retention (CRT)";
Part 13: "SDL model of the Air Interface (AI)";
Part 14: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 15: "TETRA frequency bands, duplex spacings and channel numbering";
Part 16: "Network Performance Metrics";
Part 17: "TETRA V+D and DMO specifications";
Part 18: "Air interface optimized applications";
Part 19: "Interworking between TETRA and Broadband systems".
ETSI
8 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
NOTE 1: Part 3, sub-parts 6 and 7 (Speech format implementation), part 4, sub-part 3 (Data networks gateway),
part 10, sub-part 15 (Transfer of control), part 13 (SDL) and part 14 (PICS) of this multi-part deliverable
are in status "historical" and are not maintained.
NOTE 2: Some parts are also published as Technical Specifications such as ETSI TS 100 392-2 and those may be
the latest version of the document.
Modal verbs terminology
In the present document "shall", "shall not", "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
9 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
1 Scope
The present document defines the stage 3 specifications of the Supplementary Service Pre-emptive Priority Call
(SS-PPC) for the Terrestrial Trunked Radio (TETRA).
SS-PPC enables a user to have preferential access to the network resources in a TETRA system in times of congestion
including pre-emption of calls. SS-PPC is applicable for pre-emptive priorities including the emergency priority.
SS-PPC includes the capability to pre-empt resources needed for higher priority calls and the capability to pre-empt
users from ongoing calls in order to move them to higher priority calls. SS-PPC specifies the definition, activation,
deactivation and interrogation for the usage of pre-emptive call priorities in the TETRA system. The Switching and
Management Infrastructure (SwMI) applies the SS-PPC priorities when it allocates the resources for calls. The SS-PPC
operations are defined for the SwMI and for the Mobile Station (MS).
SS-PPC is defined to subscribers of one TETRA system, but the subscribers may be located in several TETRA systems
and the information flows may be delivered over the Inter System Interface (ISI). SS-PPC is invoked for calls within
one TETRA system or for calls that extend over ISI to several TETRA systems.
Man-Machine Interface (MMI) and charging principles are outside the scope of the present document.
Supplementary Service stage 3 specification is preceded by the stage 1 and the stage 2 specifications of the service.
Stage 1 describes the functional capabilities from the user's point of view. Stage 2 defines the functional behaviour in
terms of Functional Entities (FEs) and information flows. Stage 3 gives a precise description of the supplementary
service from the implementation point of view. It defines the protocol for the service and the encoding rules for the
information flows. It defines the processes for the FEs and their behaviour. The described protocols and behaviour
apply to the SwMI, for the MS and may be applied over the ISI between TETRA systems. Aspects relating to all
supplementary services are detailed in ETSI EN 300 392-9 [3].
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air
Interface (AI)".
[2] ETSI EN 300 392-1 (V1.2.1): "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 1: General network design".
[3] ETSI EN 300 392-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 9: General requirements for supplementary services".
[4] ETSI EN 300 392-3-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 1: General design".
[5] Recommendation ITU-T Z.100: "Specification and Description Language - Overview of
SDL-2010".
ETSI
10 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
[6] ETSI EN 300 392-12-10: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 12: Supplementary services stage 3; Sub-part 10: Priority Call (PC)".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents may be useful in implementing an ETSI deliverable or add to the reader's
understanding, but are not required for conformance to the present document.
Not applicable.
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
authorized user: user who is authorized to define, activate, deactivate and interrogate SS-PPC
Call Control Agent (CCA): Call Control sub-entity for Supplementary Service Pre-emptive Priority Call in Circuit
Mode Control Entity in Mobile Station
emergency priority: highest pre-emptive priority level
Functional Entity (FE): functional characteristics of the SS sub-entity within an MS or a SwMI related to an SS-PPC
action, e.g. definition or invocation
SS-PPC call: basic service (call) to which the defined SS-PPC priority is applied
SS-PPC invocation: sending of priority request to infrastructure
NOTE: The SS-PPC invocation is done with the basic service invocation request.
SS-PPC operation: usage of SS-PPC priority for and in a basic service set-up
SS-PPC pre-emption: exclusion of one or more parties from an ongoing basic service due an SS-PPC operation for
another basic service
NOTE: The pre-emption may be done due to the lack of resources or due to the need to join a called party to a
higher priority pre-emptive call.
SS-PPC priority: any pre-emptive priority invoked and operated for an SS-PPC call
user A: calling party, the party that invokes or generates invocation of SS-PPC
user B: called party in a call in which SS-PPC is operated
user C: pre-empted user, a user that is involved in a call, which is pre-empted due to lack of resources for a SS-PPC
NOTE: There may be one, two or more pre-empted users due to a pre-empted call.
user D: remaining user or users in a call from which a user or users have been pre-empted
ETSI
11 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
visited SwMI: TETRA system of which the Mobile Network Identity (MNI) is not equal to the MNI of the user
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CC Call Control sub-entity for SS-PPC in CMCE in SwMI
CCA Call Control Agent
CMCE Circuit Mode Control Entity
FE Functional Entity
GTSI Group TETRA Subscriber Identity
ISI Inter System Interface
ITSI Individual TETRA Subscriber Identity
LS Line connected Station
MCC Mobile Country Code
MNC Mobile Network Code
MNI Mobile Network Identity
MO Mobile station Originating
MS Mobile Station
MT Mobile station Terminating
PDU Protocol Data Unit
SS Supplementary Service sub-entity within CMCE
SSI Short Subscriber Identity
SS-PC Supplementary Service Priority Call
SS-PPC Supplementary Service Pre-emptive Priority Call
SwMI Switching and Management Infrastructure
TETRA TErrestrial Trunked RAdio
TNCC-SAP TETRA Network layer Call Control Service Access Point
TNSS-SAP TETRA Network layer Supplementary Service Service Access Point
TSI TETRA Subscriber Identity
4 SS-PPC service primitives
4.1 General
This clause describes the SS-PPC services offered by Supplementary Service (SS) and call control sub entities of
CMCE of the TETRA voice plus data layer 3 service boundary in the MS. The SS-PPC services shall be offered at the
Supplementary Service Service Access Point (TNSS-SAP) and the Call Control Service Access Point (TNCC-SAP).
The SS-PPC services described in this clause shall be applicable for the MS.
NOTE: The SS-PPC services within the SwMI are outside the scope of the present document.
The SS-PPC services specified in the present document shall complement the Supplementary services and Call control
services specified in ETSI EN 300 392-2 [1], clauses 12 and 11 respectively and the Supplementary Services general
design standard ETSI EN 300 392-9 [3]. The SS-PPC services shall act as sub-services within the general
supplementary services and call control services.
SS-PPC shall be an optional supplementary service for TETRA voice plus data layer 3. If SS-PPC is supported, this
clause shall specify the services and their availability.
ETSI
12 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
4.2 SS-PPC services offered over the TNSS-SAP
4.2.0 General
When the optional SS-PPC definition, user definition, activation, deactivation, interrogation, impending pre-emption
indication and pre-empted party indication are supported, they shall be provided at TNSS-SAP.
NOTE: As the present document only deals with the SS-PPC all the service primitives have been shown without a
TNSS-PPC-prefix e.g. the TNSS-PPC-ASSIGN request is shortened into an ASSIGN request.
The SS-PPC primitives for the user A (FE1) at the MS TNSS-SAP shall be:
a) INTERROGATE request;
b) INTERROGATE indication;
c) ASSIGN indication;
d) ASSIGN response.
The SS-PPC primitives for the authorized user (FE3) at the MS TNSS-SAP shall be:
a) DEFINE request;
b) DEFINE indication;
c) INTERROGATE request;
d) INTERROGATE indication.
The SS-PPC primitives for the pre-empted called user (FE5) at the MS TNSS-SAP shall be:
a) IMPENDING-PRE-EMPTION indication.
The SS-PPC primitives for the pre-empted user (FE8) at the MS TNSS-SAP shall be:
a) IMPENDING-PRE-EMPTION indication.
The SS-PPC primitives for the user (FE9) remaining in a call after pre-emption at the MS TNSS-SAP shall be:
a) USER-PRE-EMPTED indication.
The activation and deactivation shall be done with the DEFINE request; the acknowledgement for activation and
deactivation shall be done with DEFINE indication.
The information contained in the following primitive description tables correspond to the following key:
- Remark: comment;
- C: conditional;
- O: optional;
- M: mandatory.
4.2.1 DEFINE request
Optional DEFINE request primitive may be offered from the user application to FE3 over TNSS-SAP. The primitive
shall contain the SS-PPC information parameters listed in table 1.
The subscriber identity parameter(s) shall indicate the subscriber identities on which the following definition shall be
made.
ETSI
13 ETSI EN 300 392-12-16 V1.4.1 (2026-07)
Table 1: DEFINE request contents
Parameter Request Remark
Subscriber identity M Repeatable
Activated/deactivated M Note 1
Basic service M Repeatable
SS-PPC priority M Repeatable
Delivered to user A(s) M
Acknowledgement from user A(s) C Note 2
NOTE 1: Shall be used to indicate whether or not this PDU is used to
activate a new PPC value or to deactivate an existing PPC
value. When a PPC value is de-activated, a pre-programmed
default value may then apply.
NOTE 2: Conditional on the information element "Delivered to user A(s)".

4.2.2 DEFINE confirm
If DEFINE request primitive is supported, then DEFINE confirm primitive shall be offered from FE3 to the user
application over TN
...

SLOVENSKI STANDARD
oSIST prEN 300 392-12-16 V1.4.0:2026
01-maj-2026
Prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - 12. del: Dopolnilne
storitve stopnje 3 - 16. poddel: Prednostni klic s predpravico (PPC)
Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12: Supplementary
services stage 3 - Sub-part 16: Pre-emptive Priority Call (PPC)
Ta slovenski standard je istoveten z: ETSI EN 300 392-12-16 V1.4.0 (2026-03)
ICS:
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
oSIST prEN 300 392-12-16 V1.4.0:2026 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 300 392-12-16 V1.4.0:2026

oSIST prEN 300 392-12-16 V1.4.0:2026
DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)

EUROPEAN STANDARD
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 12: Supplementary services stage 3;
Sub-part 16: Pre-emptive Priority Call (PPC)

oSIST prEN 300 392-12-16 V1.4.0:2026
2 DRAFT ETSI EN 300 392-12-16 V1.4.0 (2026-03)

Reference
REN/TCCE-03278
Keywords
data, radio, speech, stage 3, supplementary
service, TETRA, V+D
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Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 10
3 Definition of terms, symbols and abbreviations . 10
3.1 Terms . 10
3.2 Symbols . 11
3.3 Abbreviations . 11
4 SS-PPC service primitives. 11
4.1 General . 11
4.2 SS-PPC services offered over the TNSS-SAP. 11
4.2.0 General . 11
4.2.1 DEFINE request . 12
4.2.2 DEFINE confirm . 13
4.2.3 ASSIGN indication . 13
4.2.4 ASSIGN response . 13
4.2.5 INTERROGATE request . 14
4.2.6 INTERROGATE confirm . 14
4.2.7 REMOVE indication. 14
4.2.8 REMOVE response. 15
4.2.9 WITHDRAW request . 15
4.2.10 WITHDRAW confirm . 15
4.2.11 IMPENDING-PRE-EMPTION indication . 15
4.2.12 USER-PRE-EMPTED indication . 16
4.3 SS-PPC services offered over the TNCC-SAP . 16
4.3.0 General . 16
4.3.1 PRIORITY1 request - SS-PPC invocation . 16
4.3.2 PRIORITY2 confirm/indication - SS-PPC operation . 16
4.3.3 PRE-EMPTION . 17
4.4 Parameter descriptions . 17
5 SS-PPC protocol description . . 19
5.1 General . 19
5.2 SS-PPC protocol states . 19
5.2.0 General . 19
5.2.1 Protocol states of FE1 . 19
5.2.2 Protocol states of CCA to which FE1 is collocated . 20
5.2.2.1 State IDLE. 20
5.2.2.2 MO-CALL-SETUP . 20
5.2.3 Protocol states of FE21 . 20
5.2.3.0 General . 20
5.2.3.1 State IDLE. 20
5.2.4 Protocol states of CC to which FE21 is collocated . 20
5.2.4.0 General . 20
5.2.4.1 State ANY-STATE . 21
5.2.4.2 State PARTIES-PRE-EMPTED . 21
5.2.4.3 State SETUP-STARTED . 22
5.2.5 Protocol states of FE3 . 22
5.2.6 Protocol states of visited SwMI FE25. 22
5.2.7 Protocol states of CC to which FE25 is collocated . 22
5.2.7.0 General . 22
5.2.7.1 State ANY-STATE . 23
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5.2.7.2 State PARTIES-PRE-EMPTED . 23
5.2.7.3 State SETUP-STARTED . 23
5.2.8 Protocol states of FE5 . 24
5.2.9 Protocol states of CCA to which FE5 is collocated . 24
5.2.9.1 ANY STATE. 24
5.2.9.2 MT-CALL-SETUP . 24
5.2.10 Protocol states of FE8 . 25
5.2.11 Protocol states of CCA to which FE8 is collocated . 25
5.3 SS-PPC signalling procedures . 25
5.3.0 General . 25
5.3.1 Procedures for FE1 . 25
5.3.2 Procedures for FE21 . 25
5.3.2.1 Definition in FE21 . 25
5.3.2.2 Distribution in FE21 . 26
5.3.2.3 Interrogation in FE21 . 26
5.3.3 Procedures for CC to which FE21 is collocated . 27
5.3.3.1 Verify priority in CC to which FE21 is collocated . 27
5.3.4 Procedures for FE3 . 27
5.3.4.1 Verification in FE3 . 27
5.3.5 Procedures for visited SwMI FE25 . 27
5.4 PDU descriptions . 28
5.4.0 General . 28
5.4.1 ASSIGN PDU . 28
5.4.2 ASSIGN ACK PDU. 29
5.4.3 DEFINE PDU . 29
5.4.4 DEFINE ACK PDU . 30
5.4.5 INTERROGATE PDU . 30
5.4.6 INTERROGATE-ACK PDU . 31
5.4.7 REMOVE PDU . 31
5.4.8 REMOVE ACK PDU . 31
5.4.9 WITHDRAW PDU . 32
5.4.10 WITHDRAW ACK PDU . 32
5.4.11 Pre-emption. 32
5.4.11.1 D-RELEASE PDU . 32
5.4.12 Priority 1 and Priority 2 . 32
5.4.12.1 D-CONNECT PDU . 32
5.4.12.2 D-SETUP PDU . 32
5.4.12.3 U-SETUP PDU . 33
5.4.13 IMPENDING-PRE-EMPTION PDU . 33
5.4.14 USER-PRE-EMPTED PDU . 33
5.5 Information element coding . 33
5.5.0 General . 33
5.5.1 Basic service(s) . 33
5.5.2 Number of pre-empted parties . 34
5.5.3 Number of SS-PPC definitions . 34
5.5.4 PPC PDU type . 35
5.5.5 Pre-empted party . 35
5.5.6 Range type . 36
5.5.7 Result for definition . 36
5.5.8 Result for interrogation . 37
5.5.9 Result for withdrawal. 37
5.5.10 SS-PPC assignment . 37
5.5.11 SS-PPC definition . 38
5.5.12 SS-PPC priority, Call priority and Non group member SS-PPC priority . 38
5.5.13 Subscriber extension present. 38
5.5.14 Subscriber identity . 39
5.5.15 Time to pre-emption . 39
6 SS-PPC FE behaviour . 39
6.0 General . 39
6.1 Behaviour of FE1 (SS entity of user A) . 40
6.1.1 Service interaction for FE1 . 40
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6.1.2 Process description for FE1 . 41
6.2 Behaviour of CCA to which FE1 is collocated . 42
6.2.1 Service interaction for CCA to which FE1 is collocated . 42
6.2.2 Process description for CCA to which FE1 is collocated . 43
6.3 Behaviour of FE21 . 44
6.3.1 Service interaction for FE21 . 44
6.3.2 Process description for FE21 . 45
6.4 Behaviour of CC to which FE21 is collocated . 46
6.4.1 Service interaction for CC to which FE21 is collocated . 46
6.4.2 Process description for CC to which FE21 is collocated . 47
6.5 Behaviour of FE3 (SS entity of authorized user). 50
6.5.1 Service interaction for FE3 . 50
6.5.2 Process description for FE3 . 51
6.6 Behaviour of visited SwMI FE25 . 52
6.6.1 Service interaction for FE25 . 52
6.6.2 Process description for visited SwMI FE25 . 53
6.7 Behaviour of CC to which FE25 is collocated . 54
6.8 Behaviour of FE5 . 55
6.8.1 Service interaction for FE5 . 55
6.8.2 Process description for FE5 . 56
6.9 Behaviour of CCA to which FE5 is collocated . 57
6.9.0 General . 57
6.9.1 Service interaction for CCA to which FE5 is collocated . 57
6.9.2 Process description for CCA collocated to FE5 . 58
6.10 Behaviour of FE8 . 60
6.10.1 Service interaction for FE8 . 60
6.10.2 Process description for FE8 . 61
6.11 Behaviour of CCA to which FE8 is collocated . 62
6.11.1 Service interaction for CCA to which FE8 is collocated . 62
6.11.2 Process description for CCA collocated to FE8 . 63
6.12 Inter-working considerations . 63
Annex A (informative): Mapping of SS-PPC priorities received from the user application to
priorities in basic service PDUs (for the MS) . 64
Annex B (informative): Bibliography . 65
Annex C (informative): Change requests . 66
History . 67

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Intellectual Property Rights
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Foreword
This draft European Standard (EN) has been produced by ETSI Technical Committee TETRA and Critical
Communications Evolution (TCCE), and is now submitted for the combined Public Enquiry and Vote phase of the
ETSI EN Approval Procedure (ENAP).

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

The present document is part 12, sub-part 16 of a multi-part deliverable covering Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D), as identified below:
Part 1: "General network design";
Part 2: "Air Interface (AI)";
Part 3: "Interworking at the Inter-System Interface (ISI)":
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 7: "Security";
Part 9: "General requirements for supplementary services";
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Part 10: "Supplementary services stage 1";
Part 11: "Supplementary services stage 2";
Part 12: "Supplementary services stage 3";
Sub-part 1: "Call Identification (CI)";
Sub-part 2: "Call Report (CR)";
Sub-part 3: "Talking Party Identification (TPI)";
Sub-part 4: "Call Forwarding (CF)";
Sub-part 5: "List Search Call (LSC)";
Sub-part 6: "Call Authorized by Dispatcher (CAD)";
Sub-part 7: "Short Number Addressing (SNA)";
Sub-part 8: "Area Selection (AS)";
Sub-part 9: "Access Priority (AP)";
Sub-part 10: "Priority Call (PC)";
Sub-part 11:"Call Waiting (CW)";
Sub-part 12: "Call Hold (HOLD)";
Sub-part 13: "Call Completion to Busy Subscriber (CCBS)";
Sub-part 14: "Late Entry (LE)";
Sub-part 16: "Pre-emptive Priority Call (PPC)";
Sub-part 17: "Include Call (IC)";
Sub-part 18: "Barring of Outgoing Calls (BOC)";
Sub-part 19: "Barring of Incoming Calls (BIC)";
Sub-part 20: "Discreet Listening (DL)";
Sub-part 21: "Ambience Listening (AL)";
Sub-part 22: "Dynamic Group Number Assignment (DGNA)";
Sub-part 23: "Call Completion on No Reply (CCNR)";
Sub-part 24:"Call Retention (CRT)";
Part 13: "SDL model of the Air Interface (AI)";
Part 14: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 15: "TETRA frequency bands, duplex spacings and channel numbering";
Part 16: "Network Performance Metrics";
Part 17: "TETRA V+D and DMO specifications";
Part 18: "Air interface optimized applications";
Part 19: "Interworking between TETRA and Broadband systems".
NOTE 1: Part 3, sub-parts 6 and 7 (Speech format implementation), part 4, sub-part 3 (Data networks gateway),
part 10, sub-part 15 (Transfer of control), part 13 (SDL) and part 14 (PICS) of this multi-part deliverable
are in status "historical" and are not maintained.
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NOTE 2: Some parts are also published as Technical Specifications such as ETSI TS 100 392-2 and those may be
the latest version of the document.
Modal verbs terminology
In the present document "shall", "shall not", "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.
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1 Scope
The present document defines the stage 3 specifications of the Supplementary Service Pre-emptive Priority Call
(SS-PPC) for the Terrestrial Trunked Radio (TETRA).
SS-PPC enables a user to have preferential access to the network resources in a TETRA system in times of congestion
including pre-emption of calls. SS-PPC is applicable for pre-emptive priorities including the emergency priority.
SS-PPC includes the capability to pre-empt resources needed for higher priority calls and the capability to pre-empt
users from ongoing calls in order to move them to higher priority calls. SS-PPC specifies the definition, activation,
deactivation and interrogation for the usage of pre-emptive call priorities in the TETRA system. The Switching and
Management Infrastructure (SwMI) applies the SS-PPC priorities when it allocates the resources for calls. The SS-PPC
operations are defined for the SwMI and for the Mobile Station (MS).
SS-PPC is defined to subscribers of one TETRA system, but the subscribers may be located in several TETRA systems
and the information flows may be delivered over the Inter System Interface (ISI). SS-PPC is invoked for calls within
one TETRA system or for calls that extend over ISI to several TETRA systems.
Man-Machine Interface (MMI) and charging principles are outside the scope of the present document.
Supplementary Service stage 3 specification is preceded by the stage 1 and the stage 2 specifications of the service.
Stage 1 describes the functional capabilities from the user's point of view. Stage 2 defines the functional behaviour in
terms of Functional Entities (FEs) and information flows. Stage 3 gives a precise description of the supplementary
service from the implementation point of view. It defines the protocol for the service and the encoding rules for the
information flows. It defines the processes for the FEs and their behaviour. The described protocols and behaviour
apply to the SwMI, for the MS and may be applied over the ISI between TETRA systems. Aspects relating to all
supplementary services are detailed in ETSI EN 300 392-9 [3].
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air
Interface (AI)".
[2] ETSI EN 300 392-1 (V1.2.1): "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 1: General network design".
[3] ETSI EN 300 392-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 9: General requirements for supplementary services".
[4] ETSI EN 300 392-3-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 1: General design".
[5] Recommendation ITU-T Z.100: "Specification and Description Language - Overview of
SDL-2010".
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[6] ETSI EN 300 392-12-10: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 12: Supplementary services stage 3; Sub-part 10: Priority Call (PC)".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
NOTE 2: Note that for the TETRA standards, the reference is always to a European Standard (ETSI EN 300 xxx) if
such has been published, but the latest version of that standard can be either an EN or a Technical
Specification (ETSI TS 100 xxx), even if this is not visible in the reference list.
The following referenced documents may be useful in implementing an ETSI deliverable or add to the reader's
understanding, but are not required for conformance to the present document.
Not applicable.
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
authorized user: user who is authorized to define, activate, deactivate and interrogate SS-PPC
Call Control Agent (CCA): Call Control sub-entity for Supplementary Service Pre-emptive Priority Call in Circuit
Mode Control Entity in Mobile Station
emergency priority: highest pre-emptive priority level
Functional Entity (FE): functional characteristics of the SS sub-entity within an MS or a SwMI related to an SS-PPC
action, e.g. definition or invocation
SS-PPC call: basic service (call) to which the defined SS-PPC priority is applied
SS-PPC invocation: sending of priority request to infrastructure
NOTE: The SS-PPC invocation is done with the basic service invocation request.
SS-PPC operation: usage of SS-PPC priority for and in a basic service set-up
SS-PPC pre-emption: exclusion of one or more parties from an ongoing basic service due an SS-PPC operation for
another basic service
NOTE: The pre-emption may be done due to the lack of resources or due to the need to join a called party to a
higher priority pre-emptive call.
SS-PPC priority: any pre-emptive priority invoked and operated for an SS-PPC call
user A: calling party, the party that invokes or generates invocation of SS-PPC
user B: called party in a call in which SS-PPC is operated
user C: pre-empted user, a user that is involved in a call, which is pre-empted due to lack of resources for a SS-PPC
NOTE: There may be one, two or more pre-empted users due to a pre-empted call.
user D: remaining user or users in a call from which a user or users have been pre-empted
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visited SwMI: TETRA system of which the Mobile Network Identity (MNI) is not equal to the MNI of the user
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CC Call Control sub-entity for SS-PPC in CMCE in SwMI
CCA Call Control Agent
CMCE Circuit Mode Control Entity
FE Functional Entity
GTSI Group TETRA Subscriber Identity
ISI Inter System Interface
ITSI Individual TETRA Subscriber Identity
MCC Mobile Country Code
MNC Mobile Network Code
MNI Mobile Network Identity
MS Mobile Station
PDU Protocol Data Unit
SS Supplementary Service sub-entity within CMCE
SSI Short Subscriber Identity
SS-PPC Supplementary Service Pre-emptive Priority Call
SwMI Switching and Management Infrastructure
TETRA TErrestrial Trunked RAdio
TNCC-SAP TETRA Network layer Call Control Service Access Point
TNSS-SAP TETRA Network layer Supplementary Service Service Access Point
TSI TETRA Subscriber Identity
4 SS-PPC service primitives
4.1 General
This clause describes the SS-PPC services offered by Supplementary Service (SS) and call control sub entities of
CMCE of the TETRA voice plus data layer 3 service boundary in the MS. The SS-PPC services shall be offered at the
Supplementary Service Service Access Point (TNSS-SAP) and the Call Control Service Access Point (TNCC-SAP).
The SS-PPC services described in this clause shall be applicable for the MS.
NOTE: The SS-PPC services within the SwMI are outside the scope of the present document.
The SS-PPC services specified in the present document shall complement the Supplementary services and Call control
services specified in ETSI EN 300 392-2 [1], clauses 12 and 11 respectively and the Supplementary Services general
design standard ETSI EN 300 392-9 [3]. The SS-PPC services shall act as sub-services within the general
supplementary services and call control services.
SS-PPC shall be an optional supplementary service for TETRA voice plus data layer 3. If SS-PPC is supported, this
clause shall specify the services and their availability.
4.2 SS-PPC services offered over the TNSS-SAP
4.2.0 General
When the optional SS-PPC definition, user definition, activation, deactivation, interrogation, impending pre-emption
indication and pre-empted party indication are supported, they shall be provided at TNSS-SAP.
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NOTE: As the present document only deals with the SS-PPC all the service primitives have been shown without a
TNSS-PPC-prefix e.g. the TNSS-PPC-ASSIGN request is shortened into an ASSIGN request.
The SS-PPC primitives for the user A (FE1) at the MS TNSS-SAP shall be:
a) INTERROGATE request;
b) INTERROGATE indication;
c) ASSIGN indication;
d) ASSIGN response.
The SS-PPC primitives for the authorized user (FE3) at the MS TNSS-SAP shall be:
a) DEFINE request;
b) DEFINE indication;
c) INTERROGATE request;
d) INTERROGATE indication.
The SS-PPC primitives for the pre-empted called user (FE5) at the MS TNSS-SAP shall be:
a) IMPENDING-PRE-EMPTION indication.
The SS-PPC primitives for the pre-empted user (FE8) at the MS TNSS-SAP shall be:
a) IMPENDING-PRE-EMPTION indication.
The SS-PPC primitives for the user (FE9) remaining in a call after pre-emption at the MS TNSS-SAP shall be:
a) USER-PRE-EMPTED indication.
The activation and deactivation shall be done with the DEFINE request; the acknowledgement for activation and
deactivation shall be done with DEFINE indication.
The information contained in the following primitive description tables correspond to the following key:
- Remark: comment;
- C: conditional;
- O: optional;
- M: mandatory.
4.2.1 DEFINE request
Optional DEFINE request primitive may be offered from the user application to FE3 over TNSS-SAP. The primitive
shall contain the SS-PPC information parameters listed in table 1.
The subscriber identity parameter(s) shall indicate the subscriber identities on w
...