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SIST EN 300 396-3 V1.2.1:2006

(Main)

Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 3: Mobile Station to Mobile Station (MS-MS) Air Interface (AI) protocol

Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 3: Mobile Station to Mobile Station (MS-MS) Air Interface (AI) protocol

The multi-part deliverable EN 300 396 defines the TErrestrial Trunked RAdio (TETRA) Direct Mode Operation (DMO). It specifies the basic air interface, the inter-working between Direct Mode (DM) groups via repeaters, and inter-working with the TETRA Voice plus Data (V+D) system via gateways. It also specifies the security aspects in TETRA DMO, and the intrinsic services that are supported in addition to the basic bearer and teleservices. The present document applies to the TETRA DMO Mobile Station - Mobile Station (MS-MS) air interface and contains the specifications of the Data Link Layer (DLL) and the network layer according to the ISO model. It establishes the services, messages and protocols used for voice and circuit mode data calls and short data transfer, starting with the upper layers:
- it defines and specifies the protocol used by the layer 3 entity to communicate across the air interface;
- it defines and specifies the services and protocol used in the DLL.
The normative annexes mainly specify the parameter values used in the protocol.

Prizemni snopovni radio (TETRA) – Tehnične zahteve za neposredni način zveze (DMO) – 3. del: Protokol radijskega vmesnika (AI) od mobilne postaje do mobilne postaje (MS-MS)

General Information

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
Ref Project
ETSI EN 300 396-3 V1.2.1 (2004-12) - Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 3: Mobile Station to Mobile Station (MS-MS) Air Interface (AI) protocol
SIST EN 300 396-3 V1.2.1:2006SIST EN 300 396-3 V1.2.1:2006
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SIST EN 300 396-3 V1.2.1:2006
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Standards Content (Sample)


SLOVENSKI STANDARD
01-april-2006
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Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation
(DMO); Part 3: Mobile Station to Mobile Station (MS-MS) Air Interface (AI) protocol
Ta slovenski standard je istoveten z: EN 300 396-3 Version 1.2.1
ICS:
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

European Standard (Telecommunications series)

Terrestrial Trunked Radio (TETRA);
Technical requirements for Direct Mode Operation (DMO);
Part 3: Mobile Station to Mobile Station (MS-MS)
Air Interface (AI) protocol
2 ETSI EN 300 396-3 V1.2.1 (2004-12)

Reference
REN/TETRA-08064
Keywords
air interface, protocol, radio, TETRA
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
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within ETSI Secretariat.
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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.
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ETSI
3 ETSI EN 300 396-3 V1.2.1 (2004-12)
Contents
Intellectual Property Rights.11
Foreword.11
1 Scope.12
2 References.12
3 Definitions and abbreviations.13
3.1 Definitions.13
3.2 Abbreviations.15
4 Overview of protocol.17
4.1 General.17
4.2 The DM channel.17
4.3 DM call procedures .18
4.3.1 Constraints on the frame structure .19
4.3.2 Setting up a call .19
4.3.2.1 Call set-up without presence check.19
4.3.2.1.1 Basic procedure.19
4.3.2.1.2 Procedure in frequency efficient mode.20
4.3.2.2 Call set-up with presence check .21
4.3.3 Changeover in a call .21
4.3.4 Pre-emption of a DM call .22
4.3.5 Terminating a call .23
4.3.6 DM short data call .23
4.3.6.1 Unacknowledged short data message.23
4.3.6.2 Acknowledged short data message .24
4.4 DM protocol layering .24
5 Layer 3 service description.25
5.1 Introduction.25
5.2 Services offered.25
5.3 Primitive description.26
5.3.1 DMCC-COMPLETE primitive.26
5.3.2 DMCC-RELEASE primitive.27
5.3.3 DMCC-REPORT primitive.27
5.3.4 DMCC-SDS DATA primitive .27
5.3.5 DMCC-SDS REPORT primitive.28
5.3.6 DMCC-SDS UNITDATA primitive.28
5.3.7 DMCC-SETUP primitive.29
5.3.8 DMCC-TPNI primitive.30
5.3.9 DMCC-TX CEASED primitive.30
5.4 Parameter description.30
5.5 States for DMCC-SAP.35
6 Layer 3 protocol .36
6.1 Introduction.36
6.1.1 DMCC protocol states .36
6.1.1.1 IDLE.36
6.1.1.2 CALL SETUP NORMAL ORIGINATING.36
6.1.1.3 CALL SETUP NORMAL TERMINATING .36
6.1.1.4 CALL SETUP PRES_CHECK ORIGINATING.36
6.1.1.5 CALL SETUP PRES_CHECK TERMINATING.36
6.1.1.6 PRE-EMPTION.36
6.1.1.7 CALL ACTIVE TX OCCUPATION.36
6.1.1.8 CALL ACTIVE TX RESERVATION.37
6.1.1.9 CALL ACTIVE RX OCCUPATION.37
6.1.1.10 CALL ACTIVE RX RESERVATION.37
6.1.1.11 WAIT RSP OCCUPATION .37
ETSI
4 ETSI EN 300 396-3 V1.2.1 (2004-12)
6.1.1.12 WAIT RSP RESERVATION.37
6.1.1.13 ACK'D SHORT DATA INITIATED.37
6.1.1.14 UNACK'D SHORT DATA INITIATED.37
6.2 Circuit mode calls.37
6.2.1 Procedures for call set-up without presence check .38
6.2.1.1 Outgoing call.38
6.2.1.2 Incoming call.40
6.2.1.3 Temporary group address.41
6.2.2 Procedures for call set-up with presence check .41
6.2.2.1 Outgoing call.41
6.2.2.2 Incoming call.43
6.2.3 Usage of DM-OCCUPIED PDU .44
6.2.3.1 Sending of DM-OCCUPIED PDU by master DM-MS.44
6.2.3.2 Late entry by slave DM-MS.44
6.2.4 Procedures during occupation.44
6.2.4.1 Master DM-MS.44
6.2.4.2 Slave DM-MS.45
6.2.4.3 Transmitting Party Number Identification (TPNI).47
6.2.5 Procedures during reservation.47
6.2.5.1 Master DM-MS.47
6.2.5.2 Slave DM-MS.49
6.2.5.3 Pre-emption of short data sent as a transaction within a circuit mode call.51
6.2.6 Procedures to set up a new call by pre-emption.51
6.3 Short Data Service (SDS) procedures .52
6.3.1 Sending short data.53
6.3.1.1 Sending short data on a free channel.53
6.3.1.1.1 Sending unacknowledged short data on a free channel .53
6.3.1.1.2 Sending acknowledged short data on a free channel .55
6.3.1.2 Sending short data by pre-emption.57
6.3.1.3 Sending short data during circuit mode transmission.58
6.3.1.4 Sending short data as a transaction within a circuit mode call.59
6.3.1.4.1 Pre-emption to send short data as a transaction within a circuit mode call .59
6.3.1.4.2 Changeover to send short data as a transaction within a circuit mode call.60
6.3.1.4.3 Sending the short data as master of the circuit mode call.60
6.3.2 Receiving short data.60
6.3.2.1 Receiving unacknowledged short data.60
6.3.2.2 Receiving acknowledged short data.61
6.3.3 Additional addressing.61
6.3.4 Extended error protection .61
6.3.5 SDS-TL service in DMO .62
6.3.5.1 Service primitives at the DMTL-SDS-SAP .62
6.3.5.2 DMTL-SDS primitives' parameters .65
6.3.5.3 DMTL-SDS PDUs.67
6.3.5.4 DMTL-SDS procedures.67
6.4 Usage of DMA-UNITDATA primitive.70
7 Layer 2 service description.71
7.1 Introduction.71
7.2 Layer 2 architecture.72
7.2.1 Lower layer management in layer 2.73
7.3 Service descriptions.73
7.3.1 Services at the DMA-SAP .73
7.3.1.1 Services provided to layer 3.73
7.3.1.2 Service primitives at the DMA-SAP .74
7.3.1.2.1 DMA-REPORT primitive.74
7.3.1.2.2 DMA-UNITDATA primitive.74
7.3.2 Services at the DMC-SAP .75
7.3.2.1 Services provided to layer 3.75
7.3.2.2 Service primitives at the DMC-SAP .75
7.3.2.2.1 DMC-CONFIGURE primitive.76
7.3.2.2.2 DMC-REPORT primitive.76
7.3.3 Services at the DMD-SAP .76
ETSI
5 ETSI EN 300 396-3 V1.2.1 (2004-12)
7.3.3.1 Services provided to the U-plane application.76
7.3.3.2 Service primitives at the DMD-SAP .76
7.3.3.2.1 DMD-REPORT primitive.77
7.3.3.2.2 DMD-UNITDATA primitive.77
7.4 Parameter listing.77
7.4.1 Air interface encryption information .77
7.4.2 Air interface encryption state.77
7.4.2A Called party in ongoing call.78
7.4.3 Call release.78
7.4.4 Call set-up after pre-emption or changeover.78
7.4.5 Changeover request held during occupation.78
7.4.5A Channel selection information .78
7.4.6 Circuit mode information.78
7.4.7 Circuit mode type.78
7.4.8 Communication type.78
7.4.9 Destination address.78
7.4.10 Destination address type .79
7.4.10A DM channel.79
7.4.11 DM-SDU.79
7.4.12 DM-SDU length.79
7.4.12A Dual watch information.79
7.4.13 FCS flag.79
7.4.14 Half slot condition .79
7.4.15 Half slot content.79
7.4.16 Half slot importance.79
7.4.17 Half slot position.79
7.4.18 Half slot synchronization .80
7.4.19 Handle to the request .80
7.4.20 Immediate retransmission.80
7.4.21 Incomplete DM-SDS DATA/ACK received .80
7.4.21A Lower layer quality information .80
7.4.21B Master of ongoing call .80
7.4.22 Message type.80
7.4.23 New call pre-emption.80
7.4.24 Number of repeats.81
7.4.25 Priority.81
7.4.26 Priority of ongoing call .81
7.4.27 Recent user changeover request.81
7.4.28 Recent user priority.81
7.4.29 Report.81
7.4.30 Reservation time.81
7.4.31 SDS transaction type.81
7.4.32 Source address.81
7.4.33 Source address type .81
7.4.34 Stealing priority.82
7.4.35 Stolen indication.82
7.4.36 Type of pre-emption .82
7.4.37 Valid addresses.82
8 Layer 2 protocol .82
8.1 Introduction.82
8.1.1 Functions of lower MAC .82
8.1.2 Functions of upper MAC .83
8.2 Interface between lower and upper MAC.83
8.2.1 Logical channels defined at the DMV-SAP.83
8.2.2 Service primitives at the DMV-SAP.84
8.2.3 PDU mapping of the logical channels at the DMV-SAP.85
8.2.4 Scrambling mechanism.86
8.2.5 PDU error detection.86
8.2.6 Modes of operation .87
8.2.6.1 DM-MS modes of operation .87
8.2.6.1.1 Idle mode.87
ETSI
6 ETSI EN 300 396-3 V1.2.1 (2004-12)
8.2.6.1.2 Signalling mode.87
8.2.6.1.3 Traffic mode.87
8.2.6.2 Operation in traffic mode .88
8.2.6.2.1 Traffic transmission.88
8.2.6.2.2 Stealing mechanism.89
8.2.6.3 Selection of the mode of operation .89
8.3 Basic capabilities of the Physical Layer (PL).90
8.3.1 DM-MS capabilities.90
8.3.1.1 DM only and dual mode capable MS operation.90
8.3.1.2 Dual watch capable MS operation .91
8.3.1.2.1 Full Dual Watch Mobile Station (F-DW-MS).91
8.3.1.2.2 Idle Dual Watch Mobile Station (I-DW-MS) .91
8.4 Usage of DM channel.91
8.4.1 Definition of DM channel.91
8.4.1.1 DM channel arrangement.91
8.4.1.2 DM channel A operation.91
8.4.1.3 DM channel B operation .92
8.4.2 DM-MAC states.93
8.4.2.1 DM-MAC state definitions .93
8.4.2.2 DM-MS channel surveillance procedures .94
8.4.2.2.1 Initial determination of DM channel state .94
8.4.2.2.2 Fast call set-up surveillance in idle mode.96
8.4.2.2.3 DM-MS channel surveillance at call set-up.99
8.4.2.3 Master DM-MS channel maintenance procedures during a call .101
8.4.2.4 Slave DM-MS channel maintenance procedures during a call.101
8.4.2.4.1 Slave MS channel maintenance during call transaction .102
8.4.2.4.2 Slave MS signal quality measurement during call transaction .102
8.4.2.4.3 Slave MS channel maintenance during reservation .102
8.4.2.5 Additional master MS procedures in frequency efficient mode.102
8.4.2.5.1 Channel A master MS procedures .103
8.4.2.5.2 Channel B master MS procedures .103
8.4.3 Criteria for changing DM-MAC state.103
8.4.3.1 Criteria for changing DM-MAC state for master DM-MS.103
8.4.3.2 Criteria for changing DM-MAC state for slave DM-MS.104
8.4.3.3 Criteria for changing DM-MAC state for idle DM-MS .105
8.4.4 DM-MS channel monitoring procedures .107
8.4.4.1 DM channel during call set-up with presence check.108
8.4.4.2 DM channel in occupation during a circuit mode call.108
8.4.4.3 DM channel in reservation during a circuit mode call .108
8.4.4.4 DM channel in occupation during an SDS call .108
8.4.4.5 DM channel usage during pre-emption signalling .109
8.4.4.6 DM channel usage during timing change request signalling.109
8.4.5 Transmission of layer 3 messages by DM-MAC.109
8.4.5.1 Transmission of C-plane messages by DM-MAC.109
8.4.5.1.1 Transmitting DM-SETUP.109
8.4.5.1.2 Transmitting DM-SETUP PRES.110
8.4.5.1.3 Transmitting DM-CONNECT.111
8.4.5.1.4 Transmitting DM-DISCONNECT.111
8.4.5.1.5 Transmitting DM-CONNECT ACK.111
8.4.5.1.6 Transmitting DM-RELEASE.111
8.4.5.1.7 Transmitting DM-OCCUPIED.112
8.4.5.1.8 Transmitting DM-TX CEASED.112
8.4.5.1.9 Transmitting DM-TX REQUEST.113
8.4.5.1.10 Transmitting response to DM-TX REQUEST.113
8.4.5.1.11 Transmitting DM-PREEMPT.114
8.4.5.1.12 Transmitting response to DM-PREEMPT.114
8.4.5.1.13 Transmitting DM-SDS UDATA and DM-SDS DATA.115
8.4.5.1.14 Transmitting response to DM-SDS DATA .116
8.4.5.1.15 Transmitting DM-INFO.116
8.4.5.2 Transmission of U-plane messages by DM-MAC .116
8.4.6 Transmission of layer 2 messages generated by DM-MAC .116
8.4.6.1 Transmitting DM-RESERVED.117
ETSI
7 ETSI EN 300 396-3 V1.2.1 (2004-12)
8.4.6.2 Transmitting DM-SDS OCCUPIED .117
8.4.6.3 Transmitting DM-TIMING REQUEST .118
8.4.6.4 Transmitting DM-TIMING ACK.118
8.4.7 General DM-MAC procedures .118
8.4.7.1 DM-MAC repeat transmissions .118
8.4.7.2 DM-MAC frame countdown procedure.118
8.4.7.3 Use of timers .119
8.4.7.4 Linearization.119
8.4.7.5 Fragmentation.119
8.4.7.6 Fill bit indication.119
8.4.7.7 Selection of pseudo address .119
8.4.7.8 Slot flag indication .120
8.4.7.9 Requests bitmap.120
8.4.7.10 DM aspects of dual watch operation .120
8.4.7.10.1 Full and idle dual watch operation.120
8.4.7.10.2 DM aspects of full dual watch operation.120
8.4.7.10.3 DM aspects of idle dual watch operation .124
8.4.7.11 Air interface encryption .126
8.4.7.12 Channel A or B operation .126
8.4.7.13 Sending short data as a transaction within a circuit mode call.126
8.4.7.14 SDS time remaining .127
8.4.7.15 Timing change procedure.127
8.4.7.16 Timing change at changeover or pre-emption.129
8.5 MAC procedures for transfer of signalling messages.129
8.5.1 Formation of MAC PDU .129
8.5.2 Addressing.130
8.5.2.1 Transmission of message.130
8.5.2.1.1 Addressing in synchronization burst .130
8.5.2.1.2 Addressing in normal burst.132
8.5.2.2 Reception of message.132
8.5.3 Use of air interface encryption.133
8.5.4 Fragmentation and reconstruction.134
8.5.4.1 Fragmentation.134
8.5.4.2 Reconstruction.135
8.5.5 Fill bit addition and deletion.136
8.5.5.1 Fill bit addition.136
8.5.5
...

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SIST EN 300 392-1 V1.3.1:2006(Main)
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 1: General network design
ETSI EN 300 392-1 V1.3.1 (2005-06)

The present document defined addressing for Terrestrial Trunked Radio system (TETRA) supporting Voice plus Data (V+D). It also gives background information of the air interface, the interworking between TETRA systems and to  other systems via gateways, the terminal equipment interface on the Mobile Station (MS), the security aspects in TETRA networks, the management services offered to the operator, the performance objectives, and the supplementary services that come in addition to the basic and tele-services used as a basis for TETRA standardization. The present document defines and specifies the TETRA addressing and identities and their organization in groups corresponding to the different functions.
It establishes the background of the TETRA general network design for standardization purposes:
- it gives information about the circuit mode and packet mode reference points for the MS and switching and management infrastructure;
- it gives information about a model of the air interface protocol stack, different functions of layers and sublayers;
- it gives information about the functions provided by the circuit mode teleservices used for speech and basic services used for data transfer;
- it gives information about the functions related to the management of the users' mobility across networks and inside a network including roaming and migration;
- it gives information about the functions related to the transport of short data messages as a service specific to TETRA;
- it gives information about the functions related to the support of packet data service in a way specific to TETRA;
- it gives information about the supplementary services that mainly extend the capabilities of the circuit mode basic and teleservices;
- it gives information about the various possibilities of individual circuit mode call scenarios and provides guidance on priority concepts for packet data and circuit mode services and on the service quality.
NOTE: This part of the multi-part document may, by its nature as a general design statement, require updating when later parts of the multi-part document are completed and maintained (in order to avoid any non-alignment). If a discrepancy occurs between this part and any other part of the multi-part document, then the other part will take precedence. The present document may be maintained mainly on those clauses, which are referred from other parts or standards.

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SIST EN 300 392-3-3 V1.2.1:2006(Main)
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 3: Additional Network Feature Group Call (ANF-ISIGC)
ETSI EN 300 392-3-3 V1.2.1 (2004-01)

The present document defines the Terrestrial Trunked Radio system (TETRA) supporting Voice plus Data (V+D). It specifies:
• general design aspects (e.g. reference points, numbering and addressing, or protocol architecture);
• the interworking between TETRA networks;
• the interworking of TETRA networks with other networks, via gateways;
• the supplementary services applicable to the basic TETRA tele- or bearer services.
The TETRA V+D interworking - basic operation part defines the interworking between TETRA networks over the corresponding interface: the Inter-System Interface (ISI). It comprises the following sub-parts:
• ISI general design;
• Additional Network Feature - ISI Individual Call (ANF-ISIIC);
• Additional Network Feature - ISI Group Call (ANF-ISIGC);
• Additional Network Feature - ISI Short Data service (ANF-ISISD);
• Additional Network Feature - ISI Mobility Management (ANF-ISIMM);
• Speech Format Implementation for Circuit Mode Transmission;
• Speech Format Implementation for Packet Mode Transmission.
The present document is the ANF-ISIGC sub-part. In analogy with ITU-T Recommendation I.130 [19], the stage one,  stage two and stage three of the three level structure is used to describe the TETRA Inter-System Interface services as provided by European Private or Public Trunked Radio System operators:
• Stage 1, is an overall service description, from the service subscriber's and user's standpoint;
• Stage 2, identifies the functional capabilities and information flows needed to support the services described in stage 1; and
NOTE: The information flows in stage 2 have been drawn as Message Sequence Charts (MSC). Therefore PISN basic call information flows are also shown together with the ANF-ISIGC information flows.
• Stage 3, defines the signalling system protocols and switching functions needed to implement the services described in stage 1.
The present document details the Interworking Basic Operation of the Terrestrial Trunked Radio system (TETRA). Specifically this sub-part details the stage 1 aspects (overall service description) of the ANF-ISIGC as seen from the TETRA Switching and Maintenance Infrastructure point of view at the Inter-System Interface (ISI). It details the stage 2 aspects (functional partitioning) of ANF-ISIGC which includes the identification of the functional entities and the flows between them, and finally it details the stage 3 signalling protocols for the ANF-ISIGC services, i.e. the protocols at the relevant reference points between the functional entities defined in stage 2.
The ANF-ISIGC service specifies:
• TETRA Group Call Clear Speech over the ISI, acknowledged and unacknowledged;
• TETRA Group Call End-to-End Encrypted Speech over the ISI;
• TETRA Group Call Circuit Mode one slot data over the ISI;
• TETRA Group Call Circuit Mode one slot End-to-End Encrypted data over the ISI;
• TETRA Group Call Circuit Mode N × 2,4 kbit/s, N × 4,8 kbit/s or N × 7,2 kbit/s data, with N = 2, 3 or 4;
• TETRA Group Call Circuit Mode N × 2,4 kbit/s N × 4,8 kbit/s or N × 7,2 kbit/s End-to-End Encrypted data, with N = 2, 3 or 4.

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SIST EN 300 392-10-16 V1.2.1:2006(Main)
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 16: Pre-emptive Priority Call (PPC)
ETSI EN 300 392-10-16 V1.2.1 (2004-09)

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.

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SIST EN 300 392-12-3 V1.2.1:2006(Main)
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 12: Supplementary services stage 3; Sub-part 3: Talking Party Identification (TPI)
ETSI EN 300 392-12-3 V1.2.1 (2004-02)

The present document specifies the stage 3 description of the Supplementary Service Talking Party Identification (SS-TPI) for the Terrestrial Trunked Radio (TETRA). The SS-TPI supplementary service enables the party/parties participating in a call to receive the identification of the talking/sending party. The SS-TPI is activated against individual identity in individual call and against group identity in group calls.
Man-Machine Interface (MMI) and charging principles are outside the scope of the present document. The supplementary service stage 3 description is preceded by the stage 1 and the stage 2 description of the service, according to the method described in ITU-T Recommendation I.130 [10]. The stage 1 description specifies the service
from the user's point of view. The stage 2 description identifies the functional capabilities and the information flows needed to support the supplementary service as specified in its stage 1 description. The present stage 3 description specifies the protocols at the air interface and at the various Inter-System Interfaces (ISI) to support SS-TPI.
NOTE: According to ITU-T Recommendation I.130 [10], the stage 3 description of any telecommunication service addresses the network implementation aspects. Consequently it comprises two steps: the specifications of all protocols at the various reference points involved in any of the service procedures (notably the service operation) are the first step of the stage 3 description, and the specifications of the functions of the corresponding network entities are its second step. The latter have not been provided since they can be derived from the specification of the functional entity actions in the stage 2 description.
The present document is applicable to Voice plus Data individual call or group call; more specifically to the following entities:
• the MS/LS of listening/receiving users during an individual call or a group call;
• to the originating Switching and Management Infrastructures (SwMIs) in an individual call or a group call;
• to the group home SwMI and the participating SwMI for a group call;
• to the terminating SwMI for an individual call;
• and, optionally, to the home SwMI of the group or of the MS/LSs involved, for managing the supplementary service.

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SIST EN 300 395-3 V1.2.1:2006(Main)
Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 3: Specific operating features
ETSI EN 300 395-3 V1.2.1 (2005-01)

The present document describes all the functions associated with the TETRA speech codec, except the specification of the codec by itself which is entirely defined in EN 300 395-2 [1]. Clause 4 of the present document provides a description of the functions associated with the speech encoder, while clause 5 is its counterpart for the speech decoder. Clause 6 describes the contents and the format of the signalling data block included in a stolen frame when used for transferring information relevant to the codec in a U-plane signalling message. In addition, annex A provides indications and preferred solutions for the implementation of optional features.

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