SIST EN 300 392-10-16 V1.2.1:2006

• Abstract:

  The present document defines the stage 1 specifications of the Supplementary Service Pre-emptive Priority Call (SS-PPC) for the Terrestrial Trunked Radio system (TETRA). Stage 1 is an overall service description from the users point of view but does not deal with the details of the human interface itself. The present document specifies the service description of the supplementary service and the procedures to be expected with successful and unsuccessful outcomes. In addition the present document specifies the interactions with other TETRA supplementary services and interworking considerations. Charging principles are outside the scope of the present document. The SS-PPC enables a user to have preferential access to SwMI resources including pre-emption of calls.

• Status: Published
• Publication Date: 31-Mar-2006
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• 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-Apr-2006
• Due Date: 01-Apr-2006
• Completion Date: 01-Apr-2006
• Mandate: T-172-1A
• Ref Project: ETSI EN 300 392-10-16 V1.2.1 (2004-09) - Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 16: Pre-emptive Priority Call (PPC)

SIST EN 300 392-10-16 V1.2.1:2006 is the Slovenian adoption of ETSI EN 300 392-10-16 for Terrestrial Trunked Radio (TETRA) Voice plus Data, sub-part 16 on Pre-emptive Priority Call (PPC). It gives the stage 1, user-oriented service description for SS-PPC, including how priority access to SwMI resources works, when calls may be pre-empted, and how the service interacts with other TETRA supplementary services.

What does SIST EN 300 392-10-16 V1.2.1:2006 specify?

SIST EN 300 392-10-16 V1.2.1:2006 specifies the stage 1 behavior of the Supplementary Service Pre-emptive Priority Call (SS-PPC) in TETRA. In practice, that means it describes the service from the user's point of view: what the service does, how it is invoked, what happens when it succeeds or fails, and how it relates to other TETRA services.

The document is organized into scope, references, definitions and abbreviations, the SS-PPC service specification, interactions with other supplementary services, interworking considerations, and an overall SDL model.

Annex	What it covers
Annex A	Bibliography
Annex B	Change requests

What are the key requirements of SIST EN 300 392-10-16 V1.2.1:2006?

Clause 4.1 defines SS-PPC as a priority service that lets a user obtain SwMI resources even if lower priority calls must be disconnected. In practice, this is the core of the service: the network may release older, lower-CRV calls to make room for the pre-emptive call.

Clause 4.1 also covers called-user pre-emption. If the destination user is already on a call, the incoming SS-PPC call may interrupt that call unless the established call has a sufficiently high priority. For group calls, the outcome depends on whether the called user is the group call owner or only a participant, which matters for whether the whole group call is forced released or only one user is removed.

Clause 4.1.2 limits where SS-PPC applies. It applies to all individual and group TETRA teleservices and bearer services, but not to TETRA packet data services or Short Data Service (SDS). That boundary matters because implementers and buyers need to know which traffic types can actually use pre-emption.

Clause 4.2 describes provision and withdrawal on a per TETRA number basis, using Individual TETRA Subscriber Identity (ITSI) or Group TETRA Subscriber Identity (GTSI). The subscription can be set per basic service, and the service provider can offer options such as immediate pre-emption or a time to pre-emption. This matters for configuration and service ordering, because the operator may need to map the chosen policy to network behavior.

Clause 4.2.2 says the served user invokes SS-PPC during initial call set-up, and the network should allocate traffic resources even under congestion. If pre-emption warning is subscribed to, connected parties are warned before release; if immediate pre-emption is used, they are released through the normal call release path with a reason. This is the practical difference between a brief warning and an immediate takeover.

Clause 4.2.3 sets the rejection cases for definition, interrogation, cancellation, and invocation. Typical causes include not authorized, unknown TETRA identity, invalid parameters, insufficient information, or network congestion. For operations teams, these are the conditions to log and diagnose when service requests fail.

Clause 4.3 defines service interactions. SS-PPC takes precedence over services such as SS-PC, SS-CFB, and SS-CAD, and it has special behavior with SS-HOLD, SS-CRT, SS-DL, and SS-AL. This section is important because it tells implementers which service wins when features overlap.

Clause 4.4 adds interworking rules. If user C belongs to another network, indications are forwarded through that network, and the served user cannot pre-empt a called user who is not a TETRA subscriber.

What terms does SIST EN 300 392-10-16 V1.2.1:2006 define?

• Access Priority Level (APL) - the value used at initial call set-up to determine access priority across the air interface.
• Pre-emptive Priority Level (PPL) - the value that allows resources to be allocated to SS-PPC.
• Priority Level (PL) - the pre-agreed value used to determine priority access when the network is congested.
• Call Retention Value (CRV) - the priority level that protects an established call against being pre-empted.
• SwMI - Switching and Management Infrastructure, the TETRA network infrastructure that controls calls and resources.
• served user - the user who makes the SS-PPC call.
• SS-PPC call - a call that carries a pre-emptive priority value.

Who uses SIST EN 300 392-10-16 V1.2.1:2006?

TETRA network operators use this standard to define how priority calling behaves in the network. Terminal and switching equipment vendors use it to implement pre-emption, warning, rejection, and interaction behavior consistently.

Service providers and system integrators use it when configuring subscriptions, priorities, and service interactions for users such as dispatchers, emergency services, and other organizations that rely on prioritized radio access. Test and conformance teams use it to check whether a TETRA implementation follows the expected service behavior.

What changed in SIST EN 300 392-10-16 V1.2.1:2006 from the previous edition?

Annex B states that this version includes updates from change requests covering emergency call user pre-emption, SS-HOLD and group calls, SwMI behavior on call pre-emption, alignment with stage 3 functions and PDU information elements, and SS-HOLD interaction. The document history also shows the move to version V1.2.1 in September 2004.

Which standards are used with SIST EN 300 392-10-16 V1.2.1:2006?

• ITU-T Recommendation I.221 - provides the service characteristics definition used for the term busy.
• ITU-T Recommendation Z.100 - defines Specification and Description Language (SDL), used for the overall service model in clause 4.5.
• ETSI ETS 300 392-10-24 - the Call Retention (CRT) part used when SS-PPC behavior depends on CRV.

What does the SIST EN 300 392-10-16 V1.2.1:2006 document contain?

The document includes tables for subscription options and for how different priority combinations affect pre-emption, so implementers can map policy to behavior without guessing. It also includes an overall SDL model in clause 4.5, which gives a dynamic view of how the network handles invocation, congestion, and pre-emption.

Annex B provides the change-request history that led to this version. Annex A gives the bibliography, which helps readers trace related material without expanding the main requirements text.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prizemni snopovni radio (TETRA) – Govor in podatki (V+D) – 10. del: Dopolnilne storitve stopnje 1 – 16. poddel: Prednostni klic s predpravico (PPC)Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 16: Pre-emptive Priority Call (PPC)33.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)ICS:Ta slovenski standard je istoveten z:EN 300 392-10-16 Version 1.2.1SIST EN 300 392-10-16 V1.2.1:2006en01-april-2006SIST EN 300 392-10-16 V1.2.1:2006SLOVENSKI
STANDARD
ETSI ETSI EN 300 392-10-16 V1.2.1 (2004-09) 2
Reference REN/TETRA-03121 Keywords data, priority call, radio, speech, stage 1, TETRA, supplementary service ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http://portal.etsi.org/chaircor/ETSI_support.asp 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 2004. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 392-10-16 V1.2.1:2006

ETSI ETSI EN 300 392-10-16 V1.2.1 (2004-09) 3
Contents Intellectual Property Rights.5 Foreword.5 1 Scope.7 2 References.7 3 Definitions and abbreviations.7 3.1 Definitions.7 3.2 Abbreviations.8 3.2.1 General abbreviations.8 3.2.2 Supplementary Service abbreviations.8 4 Supplementary Service Pre-emptive Priority Call (SS-PPC) stage 1 specification.9 4.1 Description.9 4.1.1 General description.9 4.1.1.1 Resource pre-emption.9 4.1.1.2 Called user pre-emption.9 4.1.2 Qualifications on applicability to telecommunication services.10 4.2 Procedures.10 4.2.1 Provision and withdrawal.10 4.2.2 Normal procedures.11 4.2.2.1 Activation, deactivation, definition, registration, interrogation and cancellation.11 4.2.2.1.1 Activation and deactivation.11 4.2.2.1.2 Definition.11 4.2.2.1.3 Registration.11 4.2.2.1.4 Interrogation.11 4.2.2.1.5 Cancellation.11 4.2.2.2 Invocation and operation.11 4.2.2.2.1 General on invocation and operation.11 4.2.2.2.2 Pre-empting individual call set-up.12 4.2.2.2.3 Pre-empting group call set-up.12 4.2.3 Exceptional procedures.13 4.2.3.1 Activation, deactivation, definition, registration, interrogation and cancellation.13 4.2.3.1.1 Activation and deactivation.13 4.2.3.1.2 Definition.13 4.2.3.1.3 Registration.13 4.2.3.1.4 Interrogation.13 4.2.3.1.5 Cancellation.14 4.2.3.2 Invocation and operation.14 4.3 Interactions with other supplementary services.14 4.3.1 Calling Line Identification Presentation (SS-CLIP).14 4.3.2 COnnected Line identification Presentation (SS-COLP).14 4.3.3 Calling/Connected Line Identification Restriction (SS-CLIR).14 4.3.4 Call Report (SS-CR).14 4.3.5 Talking Party Identification (SS-TPI).15 4.3.6 Call Forwarding Unconditional (SS-CFU).15 4.3.7 Call Forwarding on Busy (SS-CFB).15 4.3.8 Call Forwarding on No Reply (SS-CFNRy).15 4.3.9 Call Forwarding on Not Reachable (SS-CFNRc).15 4.3.10 List Search Call (SS-LSC).15 4.3.11 Call Authorized by Dispatcher (SS-CAD).15 4.3.12 Short Number Addressing (SS-SNA).15 4.3.13 Area Selection (SS-AS).15 4.3.14 Access Priority (SS-AP).15 4.3.15 Priority Call (SS-PC).16 4.3.16 Call Waiting (SS-CW).16 4.3.17 Call Hold (SS-HOLD).16 SIST EN 300 392-10-16 V1.2.1:2006

ETSI ETSI EN 300 392-10-16 V1.2.1 (2004-09) 4
4.3.18 Call Completion on Busy Subscriber (SS-CCBS).16 4.3.19 Late Entry (SS-LE).16 4.3.20 Pre-emptive Priority Call (SS-PPC).16 4.3.21 Include Call (SS-IC).16 4.3.22 Barring of Outgoing Calls (SS-BOC).16 4.3.23 Barring of Incoming Calls (SS-BIC).16 4.3.24 Discreet Listening (SS-DL).17 4.3.25 Ambience Listening (SS-AL).17 4.3.26 Dynamic Group Number Assignment (SS-DGNA).17 4.3.27 Call Completion on No Reply (SS-CCNR).17 4.3.28 Call ReTention (SS-CRT).17 4.4 Interworking considerations.17 4.5 Overall SDL.18 Annex A (informative): Bibliography.21 Annex B (informative): Change requests.22 History.23
ETSI ETSI EN 300 392-10-16 V1.2.1 (2004-09) 5
Intellectual Property Rights IPRs essential or potentially essential to the present document 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 (http://webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Project Terrestrial Trunked Radio (TETRA). The present document is part 10, sub-part 16 of a multi-part deliverable covering Voice plus Data (V+D), as identified below: EN 300 392-1: "General network design"; EN 300 392-2: "Air Interface (AI)"; EN 300 392-3: "Interworking at the Inter-System Interface (ISI)"; ETS 300 392-4: "Gateways basic operation"; EN 300 392-5: "Peripheral Equipment Interface (PEI)"; EN 300 392-7: "Security"; EN 300 392-9: "General requirements for supplementary services"; EN 300 392-10:
"Supplementary services stage 1"; Sub-part 1: "Call Identification (CI)"; Sub-part 2: "Call report"; 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"; Sub-part 8: "Area Selection (AS)"; Sub-part 9: "Access priority"; 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"; Sub-part 14: "Late Entry (LE)"; SIST EN 300 392-10-16 V1.2.1:2006

ETSI ETSI EN 300 392-10-16 V1.2.1 (2004-09) 6
Sub-part 15: "Transfer of control"; 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"; Sub-part 24: "Call Retention (CRT)"; EN 300 392-11: "Supplementary services stage 2"; EN 300 392-12: "Supplementary services stage 3"; ETS 300 392-13: "SDL model of the Air Interface (AI)"; ETS 300 392-14: "Protocol Implementation Conformance Statement (PICS) proforma specification"; TS 100 392-15: "TETRA frequency bands, duplex spacings and channel numbering"; TS 100 392-16: "Network Performance Metrics"; TS 100 392-17: "TETRA V+D and DMO Release 1.1 specifications". NOTE: Part 13 (SDL) and part 14 (PICS) of this multi-part are of status "historical" and will not be updated according to this version of the standard.
National transposition dates Date of adoption of this EN: 17 September 2004 Date of latest announcement of this EN (doa): 31 December 2004 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
30 June 2005 Date of withdrawal of any conflicting National Standard (dow): 30 June 2005
ETSI ETSI EN 300 392-10-16 V1.2.1 (2004-09) 7
1 Scope The present document defines the stage 1 specifications of the Supplementary Service Pre-emptive Priority Call (SS-PPC) for the Terrestrial Trunked Radio system (TETRA). Stage 1 is an overall service description from the users point of view but does not deal with the details of the human interface itself. The present document specifies the service description of the supplementary service and the procedures to be expected with successful and unsuccessful outcomes. In addition the present document specifies the interactions with other TETRA supplementary services and interworking considerations. Charging principles are outside the scope of the present document. The SS-PPC enables a user to have preferential access to SwMI resources including pre-emption of calls. 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 and/or edition number or version number) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. [1] ITU-T Recommendation I.221: "Common specific characteristics of services". [2] ITU-T Recommendation Z.100: "Specification and Description Language (SDL)". [3] ETSI ETS 300 392-10-24: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 24: Call Retention (CRT)". 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Access Priority Level (APL): value allocated to each mobile Individual TETRA Subscriber Identity (ITSI)/Group TETRA Subscriber Identity (GTSI)/Call type that is used at the initial call set-up attempt to determine priority access across the air interface to the control functional entities busy: property of a user for whom a network determined user busy or user determined user busy condition applies NOTE: See ITU-T Recommendation I.221 [1]. Call Retention Value (CRV): call retention priority is a network option which defines the relative level of protection of the established call against the probability of having the resources pre-empted established call: call between User B and C upon which the pre-emption request is made impending pre-emption warning indication: warning provided before a pre-emption of the call is established SIST EN 300 392-10-16 V1.2.1:2006

ETSI ETSI EN 300 392-10-16 V1.2.1 (2004-09) 8
Pre-emptive Priority Level (PPL): pre-agreed value allocated to each mobile ITSI/GTSI/Call type that is used so that resources may be allocated to the SS-PPC pre-emptive state: call connection condition between the time the pre-emptive call is established by the network and the ending of the pre-emptive call, e.g. by the served user clearing Priority Level (PL): pre-agreed value allocated to each mobile ITSI/GTSI/Call type that is used to determine priority access to network resources in the event of network congestion resource: all radio and network infrastructure facilities used for an established call NOTE: Typical resource that SwMI releases due to pre-emption is allocated timeslots for an existing call. Also other resources such as links between base stations and exchange or links between SwMIs may be released.
served user: user A making the SS-PPC to user B SS-PPC call: call with a pre-emptive priority value time to pre-emption: selected time period between provision of warning of impending intrusion indication and establishment of the connection 3.2 Abbreviations 3.2.1 General abbreviations For the purposes of the present document, the following general abbreviations apply: APL Access Priority Level CSA Called Subscriber Answer CRV Call Retention Value GTSI Group TETRA Subscriber Identity I/F Interface ITSI Individual TETRA Subscriber Identity MS Mobile Station PPL Pre-emptive Priority Level PL Priority Level SDL (Functional) Specification and Description Language SDS Short Data Service SS Supplementary Service NOTE: The abbreviation SS is only used when referring to a specific supplementary service. SwMI Switching and Management Infrastructure 3.2.2 Supplementary Service abbreviations For the purposes of the present document, the following supplementary service abbreviations apply: SS-AL Ambience Listening SS-AP Access Priority SS-AS Area Selection SS-BIC Barring of Incoming Calls SS-BOC Barring of Outgoing Calls SS-CAD Call Authorized by Dispatcher SS-CCBS Call Completion to Busy Subscriber SS-CCNR Call Completion on No Reply SS-CFB Call Forwarding on Busy SS-CFNRy Call Forwarding on No Reply SS-CFNRc Call Forwarding on Not Reachable SS-CFU Call Forwarding Unconditional SS-CLIP Calling Line Identification Presentation SIST EN 300 392-10-16 V1.2.1:2006

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SS-CLIR Calling/Connected Line Identification Restriction SS-COLP COnnected Line identification Presentation SS-CR Call Report SS-CRT Call ReTention SS-CW Call Waiting SS-DGNA Dynamic Group Number Assignment SS-DL Discreet Listening SS-HOLD Call HOLD SS-IC Include Call SS-LE Late Entry SS-LSC List Search Call SS-PC Priority Call SS-PPC Pre-emptive Priority Call SS-SNA Short Number Addressing SS-TPI Talking Party Identification 4 Supplementary Service Pre-emptive Priority Call (SS-PPC) stage 1 specification 4.1 Description 4.1.1 General description 4.1.1.1 Resource pre-emption SS-PPC call enables the users to have resources allocated, even if this means that other calls with lower priority are disconnected. SS-PPC normally means one of the highest Access Priority Levels (APL) at uplink access and one of the highest Priority Levels (PL) across SwMIs. Normally the calling user defines the pre-emptive priority level for the call, but SwMI may modify that value or allocate that value. The reasons for modification or allocation are outside the scope of the present document. If the required resources are unavailable (i.e. occupied by other users) for the SS-PPC call SwMI should release resources of the oldest calls with the lowest SwMI Call Retention Value (CRV) and give the released resources to the SS-PPC call. The Call ReTention Supplementa
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