ETSI TS 100 392-3-8 V1.3.1 (2018-05)

ETSI TS 100 392-3-8 V1.3.1 (2018-05)






TECHNICAL SPECIFICATION
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI);
Sub-part 8: Generic Speech Format Implementation

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2 ETSI TS 100 392-3-8 V1.3.1 (2018-05)



Reference
RTS/TCCE-03245
Keywords
interworking, radio, TETRA, V+D
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3 ETSI TS 100 392-3-8 V1.3.1 (2018-05)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 5
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Definitions and abbreviations . 7
3.1 Definitions . 7
3.2 Abbreviations . 7
4 Overview . 8
5 ISI Traffic PDU format and procedures . 8
5.1 General on ISI traffic PDU contents. 8
5.2 TETRA ISI payload. 8
5.2.1 TETRA ISI payload encoding . 8
5.2.2 ISI Traffic PDU . 9
5.3 ISI Traffic PDU information elements . 9
5.3.1 ISI PDU framing rate . 9
5.3.2 ISI PDU frame number . 9
5.3.3 Information element control . 10
5.3.4 Additional information . 10
5.3.5 Call reference . 10
5.3.6 Traffic type . 11
5.3.7 Contents control . 11
5.3.8 Contents control and payload. 11
Annex A (informative): TETRA ISI channel mapping . 13
A.1 TETRA ISI channel mapping for E1 B-channels . 13
Annex B (normative): User information transport over E1 . 14
B.1 General . 14
B.2 LAPF Usage . 14
B.3 HDLC usage . 15
Annex C (informative): Physical layer and mapping . 17
C.1 Physical layer . 17
C.2 Mapping structure . 17
Annex D (normative): User information transport in RTP session . 18
D.1 General . 18
D.2 RTP usage . 18
Annex E (informative): Change requests . 19
History . 20

ETSI

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4 ETSI TS 100 392-3-8 V1.3.1 (2018-05)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
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.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee TETRA and Critical
Communications Evolution (TCCE).
The present document is part 3, sub-part 8 of a multi-part deliverable covering the 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)":
Sub-part 1: "General design";
Sub-part 2: "Additional Network Feature Individual Call (ANF-ISIIC)";
Sub-part 3: "Additional Network Feature Group Call (ANF-ISIGC)";
Sub-part 4: "Additional Network Feature Short Data Service (ANF-ISISDS)";
Sub-part 5: "Additional Network Feature for Mobility Management (ANF-ISIMM)";
Sub-part 6: "Speech format implementation for circuit mode transmission";
Sub-part 7: "Speech Format Implementation for Packet Mode Transmission";
Sub-part 8: "Generic Speech Format Implementation";
Sub-part 9: "Transport layer independent, General design";
Sub-part 10: "General design, PSS1 over E.1";
Sub-part 11: "General design, SIP/IP";
Sub-part 12: "Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC)";
Sub-part 13: "Transport layer independent Additional Network Feature Group Call (ANF-ISIGC)";
Sub-part 14: "Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS)";
ETSI

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5 ETSI TS 100 392-3-8 V1.3.1 (2018-05)
Sub-part 15: Transport layer independent Additional Network Feature, Mobility Management (ANF-
ISIMM)";
Part 4: "Gateways basic operation";
Part 5: "Peripheral Equipment Interface (PEI)";
Part 7: "Security";
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";
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".
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.
For all subparts in the TETRA specification ETSI EN 300 392-3, "Interworking at the Inter-System Interface (ISI)" the
terms ISI and TETRA ISI are equivalent.
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.
Introduction
The present document defines the solution in the speech transportation format that applies in the ISI.
The present document also describes the transportation of ISI speech transmission over E1 time-division multiplexed
digital lines using LAPF/HDLC encapsulation (when ISI signalling uses PSS1 as transport layer) and over IP network
using RTP and UDP encapsulation (when ISI signalling adopts SIP as transport layer).
ETSI

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6 ETSI TS 100 392-3-8 V1.3.1 (2018-05)
1 Scope
The present document specifies speech transmission format implementation independent of SwMI type.
The present document defines the format of user information that is transported between two SwMIs using the TETRA
ISI.
The present document covers how TETRA air interface circuit mode traffic is encoded for transport over various media.
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 at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
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 300 392-3-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3:
Interworking at the Inter-System Interface (ISI); Sub-part 1: General Design".
[3] ETSI EN 300 395-2: "Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic
channel; Part 2: TETRA codec".
[4] ETSI ETS 300 402-3: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Data link layer; Part 3: Frame relay protocol specification".
[5] IETF RFC 3550: "RTP: A Transport Protocol for Real Time Applications".
[6] IETF RFC 4566: "SDP: Session Description Protocol".
[7] ETSI TS 100 392-3-10: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3:
Interworking at the Inter-System Interface (ISI); Sub-part 10: General design, PSS1 over E.1".
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: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] Recommendation ITU-T G.703: "Physical/electrical characteristics of hierarchical digital
interfaces".
ETSI

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7 ETSI TS 100 392-3-8 V1.3.1 (2018-05)
[i.2] Recommendation ITU-T G.704: "Synchronous frame structures used at 1544, 6312, 2048, 8448
and 44 736 kbit/s hierarchical levels".
[i.3] Recommendation ITU-T I.431: "Primary rate User-Network interface - Layer 1 specification".
[i.4] Recommendation ITU-T I.233.1: "ISDN Frame Relaying Bearer Service".
[i.5] Recommendation ITU-T Q.922: "Digital subscriber Signalling System No. 1 (DSS 1); Data Link
Layer; ISDN Data Link Layer Specification for Frame Mode Bearer Services".
[i.6] ETSI TS 100 392-1: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 1:
General network design".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definition applies:
ISI PDU frame rate: nominal time between start of two consecutive ISI Traffic PDUs
NOTE: There may be gaps in the flow of the ISI speech frames so that a ISI speech frame is missing in its normal
time position.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACELP Algebraic CELP
AI Air Interface
BECN Backward Explicit Congestion Notification
CR Change Request
CSRC Contributing Source
DE Discard Eligibility indicator
DLCI Data Link Connection Identifier
DMO Direct Mode Operation
E1 European format for digital transmission
ETS European Technical Specification
FCS Frame Check Sequence
FECN Forward Explicit Congestion Notification
HDLC High level Data Link Control
IETF Internet Engineering Task Force
ISDN Integrated Services Digital Network
IP Internet protocol
ISI Inter System Interface
ITU-T International Telecommunication Union – Telecommunication Standardization Sector
LAPF Link Access Procedures to Frame mode bearer services
MAC Media Access Control
MS Mobile Station
PDU Protocol Data Unit
PEI Peripheral Equipment Interface
PICS Protocol Implementation Conformance Statement
PSS1 Private Network Signalling System Number 1
PVC Permanent Virtual Circuit
RFC Request For Comment
RoHC Robust header Compression
RTCP Real-time Control Protocol
RTP Real-time Transport Protocol
SDL Specification and Description Language
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8 ETSI TS 100 392-3-8 V1.3.1 (2018-05)
SIP Session Initiation Protocol
SSRC Synchronization Source
SwMI Switching and Management Infrastructure
TDMA Time Division Multiple Access
TETRA Terrestrial Trunked Radio
UDP User Datagram Protocol
V+D Voice plus Data
4 Overview
Independently of SwMI implementation, TETRA speech and circuit mode data traffic and U-plane payload is carried in
packets between two TETRA systems. The TETRA traffic and U-plane payload is carried in ISI traffic PDUs that may
be transported in various media.
Since the transmission defined in the present document is "packet mode", packets may be subject to jitter. The
maximum jitter is a SwMI specific characteristic. The value of the allowable maximum jitter value is outside the scope
of the present document.
5 ISI Traffic PDU format and procedures
5.1 General on ISI traffic PDU contents
As TETRA is a radio system normally at least one end of the communication is using air interface. The structure of the
TETRA air interface sets some requirements on the ISI traffic PDU contents and format on the ISI. The main structure
of the air interface and speech encoding is retained and ISI traffic PDU supports:
• 170/3 ms (~56,67 ms) and 60 ms ISI traffic PDU rate;
• ACELP speech coding and reservation for other codecs; and
• Call reference.
The call reference is used to link the traffic and call instance together especially in scenarios where no virtual
connection is applied.
Optionally a fully stolen or otherwise not available speech frame may be indicated to help an easier re-use of that
timeslot for other signalling purposes at the terminating system.
5.2 TETRA ISI payload
5.2.1 TETRA ISI payload encoding
The protocol has been designed to support TETRA speech codec frames (half slot/ full slot), circui
...