SIST EN 300 392-3-8 V1.4.1:2020

SLOVENSKI STANDARD
oSIST prEN 300 392-3-8 V1.4.0:2019
01-november-2019
Prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - 3. del: Medsebojno
delovanje na medsistemskem vmesniku (ISI) - 8. poddel: Izvajanje splošnega
formata govora

Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 3: Interworking at the

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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Intellectual Property Rights ................................................................................................................................ 4

Foreword ............................................................................................................................................................. 4

Modal verbs terminology .................................................................................................................................... 5

Introduction ........................................................................................................................................................ 6

1 Scope ........................................................................................................................................................ 7

2 References ................................................................................................................................................ 7

2.1 Normative references ......................................................................................................................................... 7

2.2 Informative references ........................................................................................................................................ 8

3 Definition of terms, symbols and abbreviations ....................................................................................... 8

3.1 Terms .................................................................................................................................................................. 8

3.2 Symbols .............................................................................................................................................................. 8

3.3 Abbreviations ..................................................................................................................................................... 8

4 Overview .................................................................................................................................................. 9

5 ISI Traffic PDU format and procedures ................................................................................................... 9

5.1 General on ISI traffic PDU contents................................................................................................................... 9

5.2 TETRA ISI payload.......................................................................................................................................... 10

5.2.1 TETRA ISI payload encoding .................................................................................................................... 10

5.2.2 ISI Traffic PDU .......................................................................................................................................... 10

5.3 ISI Traffic PDU information elements ............................................................................................................. 10

5.3.1 ISI PDU framing rate .................................................................................................................................. 10

5.3.2 ISI PDU frame number ............................................................................................................................... 11

5.3.3 Information element control ....................................................................................................................... 11

5.3.4 Additional information ............................................................................................................................... 11

5.3.5 Call reference .............................................................................................................................................. 12

5.3.6 Traffic type ................................................................................................................................................. 12

5.3.7 Contents control .......................................................................................................................................... 12

5.3.8 Contents control and payload...................................................................................................................... 12

Annex A (informative): TETRA ISI channel mapping ....................................................................... 15

A.1 TETRA ISI channel mapping for E1 B-channels ................................................................................... 15

Annex B (normative): User information transport over E1 ............................................................. 16

B.1 General ................................................................................................................................................... 16

B.2 LAPF Usage ........................................................................................................................................... 16

B.3 HDLC usage ........................................................................................................................................... 17

Annex C (informative): Physical layer and mapping .......................................................................... 19

C.1 Physical layer ......................................................................................................................................... 19

C.2 Mapping structure .................................................................................................................................. 19

Annex D (normative): User information transport in RTP session ................................................. 20

D.1 General ................................................................................................................................................... 20

D.2 RTP usage .............................................................................................................................................. 20

Annex E (informative): Change requests ............................................................................................. 21

History .............................................................................................................................................................. 22

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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found

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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

The present document is part 3, sub-part 8 of a multi-part deliverable covering the Terrestrial Trunked Radio (TETRA);

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)";

Sub-part 15: Transport layer independent Additional Network Feature, Mobility Management

Part 14: "Protocol Implementation Conformance Statement (PICS) proforma specification";

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

NOTE 2: Some parts are also published as Technical Specifications such as ETSI TS 100 392-2 and those may be

For all subparts in the TETRA specification ETSI EN 300 392-3, "Interworking at the Inter-System Interface (ISI)" the

Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

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

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

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).

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

The present document covers how TETRA air interface circuit mode traffic is encoded for transport over various media.

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 documents which are not found to be publicly available in the expected location might be found at

NOTE 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

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

[3] ETSI EN 300 395-2: "Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic

[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".

[7] ETSI EN 300 392-3-10: "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

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

NOTE 1: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

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 not necessary for the application of the present document but they assist the

[i.1] Recommendation ITU-T G.703: "Physical/electrical characteristics of hierarchical digital

[i.2] Recommendation ITU-T G.704: "Synchronous frame structures used at 1544, 6312, 2048, 8448

[i.3] Recommendation ITU-T I.431: "Primary rate User-Network interface - Layer 1 specification".

[i.5] Recommendation ITU-T Q.922: "Digital subscriber Signalling System No. 1 (DSS 1); Data Link

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

ITU-T International Telecommunication Union – Telecommunication Standardization Sector

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

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

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:

The call reference is used to link the traffic and call instance together especially in scenarios where no virtual

Optionally a fully stolen or otherwise not available speech frame may be indicated to help an easier re-use of that

The protocol has been designed to support TETRA speech codec frames (half slot/ full slot), circuit mode data and

U-plane services. However, the present document only describes in detail the ISI traffic PDU formats for TETRA

speech codec frames (single and dual) and U-plane services. Generic payload structure is presented in figure 5.1.

The Payload header (Contents control information element) tells the contents of the Payload blocks 1 and 2, are they

The traffic PDU is comprised of the following information elements, see table 5.1:

• call reference: this information element links the traffic PDU and call instance together;

• traffic type: this information element shall identify the type of circuit mode speech/data service;

• ISI PDU framing rate: this information element shall identify whether the speech is continuous flow or

• ISI PDU frame number: this information element shall indicate the sequence of packets (and may indicate

• contents control and payload: this information element shall define contents of the payload and the payload

Information element control 2 1 M Shall be set to a value with "Additional information

NOTE 1: The Additional information information element allows future expansion of the PDU.

NOTE 2: This information element shall be present as defined in the Information element control information

The ISI PDU framing rate information element shall be encoded as defined in table 5.2.

The ISI PDU framing rate allows the destination SwMI to determine the characteristics of the speech packet stream.

Different buffering schemes may then be applied to optimize audio delay for ISI calls.

NOTE: Any other jitter in addition to the possible gap due to the 18 TDMA frame on the air interface is outside

The ISI PDU frame number information element shall be encoded as defined in table 5.3.

ISI traffic PDUs are numbered from 1 to 17 for transmission purposes for 170/3 ms and 60 ms rate.

The ISI PDU frame number information element can be used by the destination SwMI to monitor the sequence of

speech packets and, with the ISI PDU framing rate 170/3 ms, identify when the frame 18 gap will occur in the packet

NOTE 1: The ISI PDU frame numbering can be used to optimize buffering on 170/3 ms frame rate.

When the payload message uses ISI PDU framing rate 60 ms, the ISI PDU frame number in the ISI traffic PDU shall be

NOTE 2: For the ISI PDU framing rate 60 ms each speech item may start with a value Frame 1.

The Information element control information element shall be encoded as defined in table 5.4.

Information element 2 0 Additional information information element is not present and

The Additional information information element shall be encoded as defined in table 5.5.

The optional Call reference information element shall identify the call (CC instance) to which the traffic PDU belongs

NOTE: Depending on the scenario the Call reference information may be redundant, if an individual explicit or

The contents control information element shall be encoded as defined in table 5.7.

NOTE: Traffic 1 and U-plane 1 identify contents of sub-slot 1, and traffic 2 and U-plane 2 identify contents of