SIST EN 300 392-3-10 V1.2.1:2020
(Main)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
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
The present document defines the transport of the Inter-System Interface (ISI) using PSS1 as transport layer. It
specifies:
• the PSS1 signalling used for transport of ISI APDUs; and
• the general protocol mechanism, called ISI Mediation Function which coordinates the communication between
TETRA systems.
The ISI Mediation Function applies to any TETRA Switching and Management Infrastructure (SwMI) which supports
the ISI.
Prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - 3. del: Medsebojno delovanje na medsistemskem vmesniku (ISI) - 10. poddel: Konstrukcija, splošno, PSS1 nad E.1
General Information
Standards Content (Sample)
Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
EUROPEAN STANDARD
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 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
Reference
REN/TCCE-03258
Keywords
management, mobility, TETRA
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3 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 11
4 Usage of Private Signalling System 1 (PSS1) for TETRA . 12
4.1 PSS1 Functionality . 12
4.2 Protocol stack for signalling information . 12
4.3 Generic Functional Protocol (GFP) . 13
4.4 Protocol stack for user information . 13
4.5 User information encoding at the ISI . 14
5 ISI Generic Functional Protocol (ISI GFP) . 14
5.1 Protocol model . 14
5.2 Services provided by the protocol model entities . 15
5.3 Addressing and Message Content . 16
5.3.1 PSS1 Message Content . 16
5.3.1.1 PISN Addressing . 16
5.3.1.2 Basic PSS1 Parameter Content . 17
5.3.1.3 Facility Information Element Parameter Content. 18
5.3.2 Transport of ISI APDUs . 19
5.3.2.1 General . 19
5.3.2.2 PSS1 Messages Used for Call related Services . 19
5.3.2.3 PSS1 Messages Used for Call Independent Services . 20
5.4 Procedures . 21
5.4.1 General . 21
5.4.2 Connection Initiation . 21
5.4.2.1 Call Independent Signalling . 21
5.4.2.2 Call Related Signalling . 22
5.4.3 Transport of ISI APDUs in PSS1 FACILITY. 23
5.4.4 Transport of ISI Group Call Signalling. 23
5.4.4.1 SwMI Roles for Group Call . 23
5.4.4.1.1 Definition of SwMI Roles for Group Call . 23
5.4.4.1.2 Requirements on the originating SwMI . 23
5.4.4.1.3 Requirements on the group home SwMI . 24
5.4.4.1.4 Requirements on the controlling SwMI . 24
5.4.4.1.5 Requirements on the participating SwMI . 24
5.4.4.2 Binding Rules . 25
5.4.4.3 Sequences . 26
5.4.5 Transport of ISI Individual Call Signalling . 28
5.4.5.1 SwMI Roles for Individual Call . 28
5.4.5.2 Requirements on the originating SwMI . 28
5.4.5.3 Requirements on the destination SwMI . 28
5.4.5.4 Call Restoration . 29
5.4.5.5 Binding Rules . 29
5.4.5.6 Sequences . 30
5.4.6 Error Handling . 31
5.4.7 Call Release . 35
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4 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
5.4.7.1 Release of a Call Independent Connection . 35
5.4.7.2 Release of a Call Related Connection . 35
5.5 ISI GFP requirements and operation definition . 37
5.6 Segmentation Service Element (SSE) . 37
5.6.1 Procedures. 37
5.6.2 Requirements for procedures . 38
5.6.2.1 Requirements for the segmentation procedure . 38
5.6.2.2 Requirements for the re-assembly procedure . 38
5.6.3 Segment encoding . 39
5.7 Co-ordinationFunction . 39
Annex A (informative): PSS1 Message Content . 41
A.1 Maximum length of an ISI APDU or a SSE segment encoded in a facility information element . 41
A.2 Example of the encoding of an ANF-ISIMM MIGRATION RESPONSE PDU in an ISI Invoke
APDU in a PSS1 FACILITY PDU . 41
Annex B (informative): Bibliography . 43
Annex C (informative): Change requests . 44
History . 45
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5 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
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
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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 standards EN Approval Procedure.
The present document is part 3, sub-part 10 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)";
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6 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
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
(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";
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.
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.
The present document is based on ETSI EN 300 392-3-1 [i.2]. The main differences are:
• General information about ISI is included in ETSI EN 300 392-3-9 [2].
• Information about ISI APDU to PSS1 message mapping is added.
• Signalling sequences are added.
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.
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
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7 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
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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8 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
1 Scope
The present document defines the transport of the Inter-System Interface (ISI) using PSS1 as transport layer. It
specifies:
• the PSS1 signalling used for transport of ISI APDUs; and
• the general protocol mechanism, called ISI Mediation Function which coordinates the communication between
TETRA systems.
The ISI Mediation Function applies to any TETRA Switching and Management Infrastructure (SwMI) which supports
the ISI.
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 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 300 392-3-8: "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".
[2] ETSI EN 300 392-3-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 9: Transport layer independent,
General design".
[3] ETSI EN 300 392-3-12: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 12: Transport layer independent
Additional Network Feature Individual Call (ANF-ISIIC)".
[4] ETSI EN 300 392-3-13: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 13: Transport layer independent
Additional Network Feature Group Call (ANF-ISIGC)".
[5] Void.
[6] Void.
[7] ETSI ETS 300 402-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Data link layer; Part 1: General aspects [ITU-T
Recommendation Q.920 (1993), modified]".
[8] ETSI ETS 300 402-2: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Data link layer; Part 2: General protocol specification [ITU-T
Recommendation Q.921 (1993), modified]".
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9 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
[9] ISO/IEC 11572: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Network -- Circuit mode bearer services --
Inter-exchange signalling procedures and protocol".
[10] ISO/IEC 11582: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Network -- Generic functional protocol for the
support of supplementary services -- Inter-exchange signalling procedures and protocol".
[11] Recommendation ITU-T G.704: "Synchronous frame structures used at 1544, 6312, 2048, 8448
and 44 736 kbit/s hierarchical levels".
[12] Recommendation ITU-T Q.931: "ISDN user-network interface layer 3 specification for basic call
control".
[13] Void.
[14] ISO/IEC 11571: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Networks -- Addressing".
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 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 X.229: "Remote Operations: Protocol specification".
[i.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 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ISO/IEC 11582 [10] and the following apply:
call independent: property of information which is conveyed between SwMIs on a signalling connection which is not
related to an audio call
call independent signalling connection: signalling connection established between ANF-ISI entities located in
different Switching and Management Infrastructures is not related to audio calls
co-ordination Function: entity which provides co-ordination between different ANF-ISI entities, ROSE, SSE and
GFT Control for different TETRA basic and supplementary services
destination SwMI: Switching and Management Infrastructure where the receiving ANF-ISI entity is located (in the
context of a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
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10 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
Generic Functional Transport Control (GFT Control) entity: entity that exists within a Switching and Management
Infrastructure and provides a range of services to the ANF-ISI entities and ROSE via the co-ordination Function
NOTE: The services are defined in clause 6 of ISO/IEC 11582 [10].
group attached SwMI: Switching and Management Infrastructure different from the home SwMI of the group
considered in which at least one individual subscriber member of the group is attached to that group
Group TETRA Subscriber Identity (GTSI): TETRA Subscriber Identity assigned to a group
home SwMI: Switching and Management Infrastructure in which the subscription of a given user is registered
NOTE: That user is defined as being a subscriber (see below the definition of that term).
invocation: action taken by the user or by the service provider to execute a specific service function within real time
ISI Mediation Function: entity which provides to different ANF-ISI entities the services that are not supported by the
transport layer protocol
Location Area (LA): area within radio coverage of a base station or group of base stations within which a Mobile
Station (MS) is allowed to operate
Mobile Network Identity (MNI): identity that uniquely identifies the SwMI
NOTE: It consists of the Mobile Country Code (MCC) and the Mobile Network Code (MNC).
Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA
services
NOTE: By definition, a mobile station contains at least one Mobile Radio Stack (MRS).
originating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the calling user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
originates a Call independent signalling connection
PISN number: number that unambiguously identifies the addressed PINX or an addressable entity associated with that
PINX as defined in ISO/IEC 11571 [14]
segmentation: act of generating two or more PDUs derived from one ISI PDU
semi-permanent connection: logical connection between two network nodes (SwMIs)
service user: abstract representation of the totality of those entities in a single system that makes use of a service
through a single access point
Short Subscriber Identity (SSI): network specific portion of a TSI
NOTE: A SSI is only unique within one TETRA sub-domain (one TETRA network).
source SwMI: Switching and Management Infrastructure where the sending ANF-ISI entity is located (in the context of
a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
subscriber: user of a telecommunication service, based on a contract with the provider of the service
NOTE 1: The subscriber may be an individual or a group: in the first case it is identified by an ITSI, in the second,
by a GTSI.
NOTE 2: The individual subscriber is able to access an SwMI either through a MS or Line Station.
supplementary service: service which modifies or supplements a basic bearer service or a basic teleservice
NOTE: A supplementary service cannot be offered to a customer as a stand-alone service. It should be offered in
combination with a bearer service or a teleservice.
Switching and Management Infrastructure (SwMI): all of the TETRA equipment for a Voice plus Data (V+D)
network
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11 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
terminating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the called user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
terminates a Call independent signalling connection
TETRA Subscriber Identity (TSI): global TETRA network address that is to identify an individual or a group
subscriber within the domain of all TETRA networks
user: entity using the services of a telecommunications network via an externally accessible service access point
NOTE: An individual user may be a person or an application process.
user information: TETRA coded speech
visited SwMI: TETRA network which MNI is not equal to the user's or the group's MNI
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ANF Additional Network Feature
ANF-ISI all Additional Network Features of the Inter-System Interface
APDU Application Protocol Data Unit
ASN.1 Abstract Syntax Notation One
C Conditional
E.1 E-carrier signal level 1, 2 048 kbit/s
ECMA European Computer Manufacturers Association
GFP Generic Functional Protocol
GFT Generic Functional Transport
GTSI Group TETRA Subscriber Identity
HDLC High-level Data Link Control
ISI Inter-System Interface
ISIIC Inter System Interface Individual Call
ISIGC Inter System Interface Group Call
ISIMM Inter System Interface Mobility Management
ISISDS Inter System Interface Short Data Service
ISISS Inter System Interface Supplementary Services
ISSI Individual Short Subscriber Identity
ITSI Individual TETRA Subscriber Identity
LAPD Link Access Procedure for the D-Channel
M Mandatory
MCC Mobile Country Code
MM Mobility Management
MNC Mobile Network Code
MNI Mobile Network Identity
MRS Mobile Radio Stack
MS Mobile Station
NFE Network Facility Extension
O Optional
PC Protocol Control
PDU Protocol Data Unit
PINX Private Integrated Network eXchange
PISN Private Integrated Services Network
PSS1 Private Signalling System 1
ROSE Remote Operation Service Element
SDL Specification and Description Language
SDS Short Data Service
SSE Segmentation Service Element
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SSI Short Subscriber Identity
SwMI TETRA Switching and Management Infrastructure
TSI TETRA Subscriber Identity
TX Transmit
V+D Voice plus Data
4 Usage of Private Signalling System 1 (PSS1) for
TETRA
4.1 PSS1 Functionality
The TETRA ISI application can use the PSS1 protocol stack for interconnecting Private Integrated Network eXchanges
(PINXs) to form Private Integrated Services Network (PISN). PSS1 is the ISO term; the PSS1 protocol is also known,
informally, as QSIG, generic term created by the European Computer Manufacturers Association (ECMA) which
developed most of the signalling protocols comprised in the PSS1 protocol.
TETRA uses the standard functionalities defined for PSS1:
• signalling for the support of circuit-mode basic services (see note);
• Generic Functional Protocol (GFP) originally defined for the support of supplementary services.
NOTE: The definition of PSS1 basic call is in ISO/IEC 11572 [9].
4.2 Protocol stack for signalling information
Figure 4.1 shows how the protocols for TETRA ANF, which apply at the ISI, are built on top of the PSS1 protocol
stack. The ISI APDU is used to convey ANF-ISI Protocol Data Units (PDU). The definition of ISI APDUs and the
handling of ISI APDUs in ETSI EN 300 392-3-9 [2] is a subset of the ROSE protocol description [i.1] and are treated as
ROSE APDUs in the PSS1 messages.
SwMI- 1 SwMI- 2
TETRA ANF
TETRA ANF
Specific TETRA operations Specific TETRA operations
ISO /IEC 11582 ISO/IEC 11582
ISO /IEC 11572 ISO/ IEC11572
ETS 300 402- 1 and 2 ETS 300 402- 1 and 2
Layer 1 Layer 1
NOTE: Layer 2 protocol depends on the type of the inter-connection.
Figure 4.1: PSS1 protocol stack for TETRA
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13 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
The protocol stack shown in figure 4.1 is for signalling information exchange on the common signalling channel
i.e. D-channel. LAPD framing as defined in ETSI ETS 300 402-1 [7] and ETSI ETS 300 402-2 [8] and E.1, refer to
Recommendation ITU-T G.704 [11], common signalling channel 16 shall be used. Protocol stack for user information
exchange is presented in clause 4.4.
4.3 Generic Functional Protocol (GFP)
The GFP as defined in ISO/IEC 11582 [10] shall be used for all TETRA ANFs of the ISI (ANF-ISI).
ISI operations shall be used to convey ANF-ISI information in Facility information elements, as described in clause 5.
These Facility information elements shall be included in PSS1 messages in accordance with ISO/IEC 11582 [10]. The
specification given in clause 7.1.1.1 of ISO/IEC 11582 [10] as to when an SwMI can send a PSS1 FACILITY message
at the earliest shall be understood as follows:
• such message can be sent by a receiving SwMI after it has sent a PSS1 CALL PROCEEDING message
(following reception of a PSS1 SETUP message);
• such message can be sent by a source SwMI after it has received one of the following PSS1 messages:
FACILITY, PROGRESS, ALERTING, CONNECT.
When the call independent signalling connection is used, it shall be connection oriented.
NOTE: This is in line with the choice made for the definition of all existing supplementary services of the PSS1
protocols.
4.4 Protocol stack for user information
Call control manages transportation of user information e.g. TETRA coded speech on B channels as presented in
Q
figure 4.2. In this protocol stack the E.1 channels are 64 kbit/s channels supporting unrestricted digital information,
refer to Recommendation ITU-T G.704 [11].
TETRA Call control Call control TETRA
coded user signalling signalling coded user
information information
HDLC LAPD LAPD HDLC
framing framing framing framing
E.1 E.1 Common E.1 E.1
channel 16 channel channel 16 channel
channel
selection (PSS1) signalling (PSS1) selection
E.1 User information E.1
channel 1 channel 1
etc. etc. etc.
E.1 User information E.1
channel 31 channel 31
Figure 4.2: User information protocol stack
For speech transmission the TETRA coded user information is speech frames that shall be carried in an B channel
Q
using HDLC frames, refer to ETSI EN 300 392-3-8 [1], annex B. The call control negotiates the B channel for each
Q
call instance and locally select the negotiated B channel. The mapping between TETRA ISI channels and B channels
Q Q
is defined in ETSI EN 300 392-3-8 [1], annex A. Call control signalling (ETSI EN 300 392-3-12 [3] and ETSI EN 300
392-3-13 [4]), LAPD framing (ETSI ETS 300 402-1 [7] and ETSI ETS 300 402-2 [8]) and E.1 common signalling
channel 16 are presented in figure 4.1 for call control.
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14 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
All or a sub-set of B channels 1 to 15 and 17 to 31 shall be considered to be available for user information transport as
Q
negotiated at the PSS1 connection negotiation. It can be assumed that the B channels are physically connected at the
Q
same time as the LAPD connection is set-up on the common control channel and there shall be no additional E.1
channel set-up signalling at the link layer.
4.5 User information encoding at the ISI
Whether in a group call or in an individual call, the user information shall be sent over ISI user information
connections, which will be considered as B channels by the PSS1 protocols used to establish these calls.
Q
It has been assumed that these connections will be digital, their standard data rate being 64 kbit/s.
Clause 4.4 presents the protocol stack for user information transport and its relation to the call control.
5 ISI Generic Functional Protocol (ISI GFP)
5.1 Protocol model
The TETRA ISI over E.1 is based on the PSS1 protocols stack in order to enable the interconnection of SwMIs through
a PISN. Signalling needs for TETRA ISI operation, which are not directly supported by PSS1 basic call protocols, are
provided by ISI Mediation Function.
The ISI Mediation Function does not by itself control sending of any ANF-ISI PDUs but rather provides a means to
convey them.
ETSI
15 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
Figure 5.1 shows the conceptual model of the ISI GFP. The generic ISI Mediation Function includes a Call Control
function, a Coordination Function, ROSE (implementing the PDU Identification service), a Segmentation Service (for
segmentation of messages) and the Generic Functional Transport Control (implementing the Connection Service).
ANF ISIIC ANF ISIGC ANF ISISS ANF ISISDS ANF ISIMM
ISI Mediation Function
ROSE
Coordination
Call Control
Function
Segmentation
Service
GFT Control
PSS1 Protocol Control
ROSE: Remote Operation Service
SSE: Segmentation Service
GFT: Generic Functional Transport
Figure 5.1: Protocol model of the ISI Generic Functional Protocol
The entities PSS1 Protocol Control (PC), Generic Functional Transport Control (GFT Control), Co-ordination Function,
Call Control and ROSE shall exist in any E.1 based SwMI which supports the ISI. The existence in a SwMI of the other
entities shown on figure 5.1 shall depend on the ANF-ISIs supported by this SwMI.
5.2 Services provided by the protocol model entities
ANF entities (i.e. ANF-ISIIC, ANF-ISIGC, ANF-ISISDS, ANF-ISISS and ANF-ISIMM entities) use the services of the
ROSE entity via the Coordination Function in order to convey ANF-ISI PDUs between TETRA networks.
ISI Application Protocol Data Units (ISI APDUs) are carried inside the Facility information elements, as described in
clause 4.3. These Facility information elements shall be included in PSS1 messages in accordance with
ISO/IEC 11582 [10].
The ISI APDUs shall be those specified in ETSI EN 300 392-3-9 [2]. As ROSE is used as network protocol in Facility
information elements the ISI APDUs are treated as ROSE APDUs in the PSS1 messages.
If an ISI APDU is call independent and its length exceeds its possible maximum, the Coordination Function shall
address it to the Segmentation Service Element (SSE) so that this ISI APDU can be transparently transported in spite of
its length (see clause 5.6). The same shall apply for a call related ISI APDU with a length exceeding its possible
maximum provided that it does not have to be sent in a specific PSS1 basic call message.
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16 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
ROSE and SSE shall use the connection oriented services of GFT Control as defined in clause 6.7.1 of
ISO/IEC 11582 [10], via the Coordination Function. GFT Control in turn shall use the PSS1 Protocol Control (PC)
services as defined in clause 6.8 of ISO/IEC 11582 [10]. GFT control provides services to establish and release of Call
independent signalling connections and also transport services for the carriage of call related or call independent ISI
APDUs between different PINXs. The corresponding PISN protocols are defined in clauses 7.1 and 7.3 of
ISO/IEC 11582 [10]. The interaction between ROSE users (ISI-ANFs), ROSE itself, SSE and GFT Control is
co-ordinated by the Coordination Function.
ANF-ISIIC and ANF-ISIGC use PC services for sending PSS1 call messages over PISN as defined in
ISO/IEC 11572 [9]. They also use the extensions of PC services and the connection oriented services of GFT Control
together with the services of ROSE and of the Coordination Function to convey their PDUs, as defined in
ISO/IEC 11582 [10] to convey ISI APDUs. The ANF-ISIIC and ANF-ISIGC PDUs carry either:
• complementary TETRA call information, in PSS1 basic call messages; or
• TETRA call related messages, in PSS1 FACILITY messages.
ANF-ISIMM and ANF-ISISDS also use the extensions of PC services and the connection oriented services of
GFT Control together with the services of ROSE and of the Coordination Function to convey their PDUs, as defined in
ISO/IEC 11582 [10]. However the procedures which apply for the transport of the ISI APDUs conveying their PDUs
are the connection oriented call independent procedures defined in clause 7.3 of ISO/IEC 11582 [10].
NOTE 1: No PSS1 call related procedures, as defined in clause 7.1 of ISO/IEC 11582 [10], apply for transmitting
the ISI APDUs conveying the ANF-ISIMM PDUs because all MM information is TETRA call
independent and no need has been found to send any of that exchanged between SwMIs (over their ISIs)
as PISN user information (i.e. using a B channel, possibly more, as transmission channel for the
Q
ANF-ISIMM PDUs). Similarly for ANF-ISISDS, no need has been found to send any of the SDS
information exchanged between SwMIs (over their ISIs) as PISN user information (i.e. using a B
Q
channel, possibly more, as transmission channel for the ANF-ISISDS PDUs): i.e. although from a formal
point of view the sending of SDS messages can be considered as a TETRA call (in taking the definition of
a call as being the instance of a basic service and considering that SDS is a TETRA basic service), the
decision has been taken not to establish any PISN call to convey SDS information over the ISI.
NOTE 2: According to the definition of the connection oriented call independent procedures in
ISO/IEC 11582 [10], ISI APDUs conveying call independent ANF-ISI PDUs (e.g. ANF-ISIMM or
ANF-ISISDS PDUs) may be sent in the PSS1 messages which establish the related call independent
signalling connection.
ANF-ISISS uses the same services as ANF-ISIMM and ANF-ISISDS for its call independent procedures. It uses the
connection oriented services of GFT Control and the related extensions of PC services, both as defined in
ISO/IEC 11582 [10], for its call related procedures.
NOTE 3: The latter statement implies that ANF-ISISS uses the signalling connections of either ANF-ISIIC or
ANF-ISIGC for its call related procedure.
5.3 Addressing and Message Content
5.3.1 PSS1 Message Content
5.3.1.1 PISN Addressing
When PINXs are connected together within a Private Integrated Services Network (PISN) then according to
ISO/IEC 11572 [9] the Called party number and Calling Party Number are used to route the PSS1 messages between
the source and the destination PINX possibly via one or several transit PINX(s). Each TETRA SwMI shall in that case
be assigned at least one PISN number.
PSS1 SETUP messages shall be include a PISN number of with the source SwMI as Calling Party Number and a PISN
number of the destination SwMI PISN numbers as Called Party Number.
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17 Draft ETSI EN 300 392-3-10 V1.2.0 (2019-08)
If a call is forward switched the PISN number of the forward switching SwMI (i.e. source SwMI of second PSS1
SETUP message) shall be included as Calling Party Number in the PSS1 SETUP message between the forward
switching SwMI and the terminating SwMI (i.e. destination SwMI of the second PSS1 SETUP message).
The PISN numbers to address the correct PINX of another TETRA network can be obtained as follows:
• received inside a TETRA PDU in some previous message exchange (more precisely, the PISN number will
have been received in ANF-ISIMM in relation to the migration of the MS; or
• defined by a routing table on the basis of the SwMI MNI.
The PISN numbers defined above shall always correspond to SwMIs or SwMI entities, and never to any TETRA
subscriber. A TETRA individual subscriber shall be addressed using its ITSI and a TETRA group using its GTSI. This
ITSI or GTSI shall thus have to be included in the ANF-ISI PDUs whenever needed.
NOTE: If there is a semi-permanent E1 connection between two TETRA SwMIs, the use of the PISN numbers of
Calling Party Number and Called Party Number information elements are not applicable for routing
purposes. However the information elements have to be always present in PSS1 Setup message.
5.3.1.2 Basic PSS1 Parameter Conten
...
EUROPEAN STANDARD
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 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
Reference
REN/TCCE-03258
Keywords
management, mobility, TETRA
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ETSI
3 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 11
4 Usage of Private Signalling System 1 (PSS1) for TETRA . 12
4.1 PSS1 Functionality . 12
4.2 Protocol stack for signalling information . 12
4.3 Generic Functional Protocol (GFP) . 13
4.4 Protocol stack for user information . 13
4.5 User information encoding at the ISI . 14
5 ISI Generic Functional Protocol (ISI GFP) . 14
5.1 Protocol model . 14
5.2 Services provided by the protocol model entities . 15
5.3 Addressing and Message Content . 16
5.3.1 PSS1 Message Content . 16
5.3.1.1 PISN Addressing . 16
5.3.1.2 Basic PSS1 Parameter Content . 17
5.3.1.3 Facility Information Element Parameter Content. 18
5.3.2 Transport of ISI APDUs . 19
5.3.2.1 General . 19
5.3.2.2 PSS1 Messages Used for Call related Services . 19
5.3.2.3 PSS1 Messages Used for Call Independent Services . 20
5.4 Procedures . 21
5.4.1 General . 21
5.4.2 Connection Initiation . 21
5.4.2.1 Call Independent Signalling . 21
5.4.2.2 Call Related Signalling . 22
5.4.3 Transport of ISI APDUs in PSS1 FACILITY. 23
5.4.4 Transport of ISI Group Call Signalling. 23
5.4.4.1 SwMI Roles for Group Call . 23
5.4.4.1.1 Definition of SwMI Roles for Group Call . 23
5.4.4.1.2 Requirements on the originating SwMI . 23
5.4.4.1.3 Requirements on the group home SwMI . 24
5.4.4.1.4 Requirements on the controlling SwMI . 24
5.4.4.1.5 Requirements on the participating SwMI . 24
5.4.4.2 Binding Rules . 25
5.4.4.3 Sequences . 26
5.4.5 Transport of ISI Individual Call Signalling . 28
5.4.5.1 SwMI Roles for Individual Call . 28
5.4.5.2 Requirements on the originating SwMI . 28
5.4.5.3 Requirements on the destination SwMI . 28
5.4.5.4 Call Restoration . 29
5.4.5.5 Binding Rules . 29
5.4.5.6 Sequences . 30
5.4.6 Error Handling . 31
5.4.7 Call Release . 35
5.4.7.1 Release of a Call Independent Connection . 35
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4 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
5.4.7.2 Release of a Call Related Connection . 35
5.5 ISI GFP requirements and operation definition . 37
5.6 Segmentation Service Element (SSE) . 37
5.6.1 Procedures. 37
5.6.2 Requirements for procedures . 38
5.6.2.1 Requirements for the segmentation procedure . 38
5.6.2.2 Requirements for the re-assembly procedure . 38
5.6.3 Segment encoding . 39
5.7 Co-ordinationFunction . 39
Annex A (informative): PSS1 Message Content . 41
A.1 Maximum length of an ISI APDU or a SSE segment encoded in a facility information element . 41
A.2 Example of the encoding of an ANF-ISIMM MIGRATION RESPONSE PDU in an ISI Invoke
APDU in a PSS1 FACILITY PDU . 41
Annex B (informative): Bibliography . 43
Annex C (informative): Change requests . 44
History . 45
ETSI
5 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
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 European Standard (EN) has been produced by ETSI Technical Committee TETRA and Critical Communications
Evolution (TCCE).
The present document is part 3, sub-part 10 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)";
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6 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
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";
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.
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.
The present document is based on ETSI EN 300 392-3-1 [i.2]. The main differences are:
• General information about ISI is included in ETSI EN 300 392-3-9 [2].
• Information about ISI APDU to PSS1 message mapping is added.
• Signalling sequences are added.
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.
National transposition dates
Date of adoption of this EN: 13 November 2019
Date of latest announcement of this EN (doa): 31 July 2020
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 January 2021
Date of withdrawal of any conflicting National Standard (dow): 31 January 2021
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7 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
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
8 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
1 Scope
The present document defines the transport of the Inter-System Interface (ISI) using PSS1 as transport layer. It
specifies:
• the PSS1 signalling used for transport of ISI APDUs; and
• the general protocol mechanism, called ISI Mediation Function which coordinates the communication between
TETRA systems.
The ISI Mediation Function applies to any TETRA Switching and Management Infrastructure (SwMI) which supports
the ISI.
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 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 300 392-3-8: "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".
[2] ETSI EN 300 392-3-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 9: Transport layer independent,
General design".
[3] ETSI EN 300 392-3-12: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 12: Transport layer independent
Additional Network Feature Individual Call (ANF-ISIIC)".
[4] ETSI EN 300 392-3-13: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 13: Transport layer independent
Additional Network Feature Group Call (ANF-ISIGC)".
[5] Void.
[6] Void.
[7] ETSI ETS 300 402-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Data link layer; Part 1: General aspects [ITU-T
Recommendation Q.920 (1993), modified]".
[8] ETSI ETS 300 402-2: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Data link layer; Part 2: General protocol specification [ITU-T
Recommendation Q.921 (1993), modified]".
ETSI
9 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
[9] ISO/IEC 11572: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Network -- Circuit mode bearer services --
Inter-exchange signalling procedures and protocol".
[10] ISO/IEC 11582: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Network -- Generic functional protocol for the
support of supplementary services -- Inter-exchange signalling procedures and protocol".
[11] Recommendation ITU-T G.704: "Synchronous frame structures used at 1544, 6312, 2048, 8448
and 44 736 kbit/s hierarchical levels".
[12] Recommendation ITU-T Q.931: "ISDN user-network interface layer 3 specification for basic call
control".
[13] Void.
[14] ISO/IEC 11571: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Networks -- Addressing".
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 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 X.882: "Information technology - Remote Operations: OSI realizations -
Remote Operations Service Element (ROSE) protocol specification".
[i.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 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ISO/IEC 11582 [10] and the following apply:
call independent: property of information which is conveyed between SwMIs on a signalling connection which is not
related to an audio call
call independent signalling connection: signalling connection established between ANF-ISI entities located in
different Switching and Management Infrastructures is not related to audio calls
co-ordination Function: entity which provides co-ordination between different ANF-ISI entities, ROSE, SSE and
GFT Control for different TETRA basic and supplementary services
destination SwMI: Switching and Management Infrastructure where the receiving ANF-ISI entity is located (in the
context of a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
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10 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
Generic Functional Transport Control (GFT Control) entity: entity that exists within a Switching and Management
Infrastructure and provides a range of services to the ANF-ISI entities and ROSE via the co-ordination Function
NOTE: The services are defined in clause 6 of ISO/IEC 11582 [10].
group attached SwMI: Switching and Management Infrastructure different from the home SwMI of the group
considered in which at least one individual subscriber member of the group is attached to that group
Group TETRA Subscriber Identity (GTSI): TETRA Subscriber Identity assigned to a group
home SwMI: Switching and Management Infrastructure in which the subscription of a given user is registered
NOTE: That user is defined as being a subscriber (see below the definition of that term).
invocation: action taken by the user or by the service provider to execute a specific service function within real time
ISI Mediation Function: entity which provides to different ANF-ISI entities the services that are not supported by the
transport layer protocol
Location Area (LA): area within radio coverage of a base station or group of base stations within which a Mobile
Station (MS) is allowed to operate
Mobile Network Identity (MNI): identity that uniquely identifies the SwMI
NOTE: It consists of the Mobile Country Code (MCC) and the Mobile Network Code (MNC).
Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA
services
NOTE: By definition, a mobile station contains at least one Mobile Radio Stack (MRS).
originating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the calling user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
originates a Call independent signalling connection
PISN number: number that unambiguously identifies the addressed PINX or an addressable entity associated with that
PINX as defined in ISO/IEC 11571 [14]
segmentation: act of generating two or more PDUs derived from one ISI PDU
semi-permanent connection: logical connection between two network nodes (SwMIs)
service user: abstract representation of the totality of those entities in a single system that makes use of a service
through a single access point
Short Subscriber Identity (SSI): network specific portion of a TSI
NOTE: A SSI is only unique within one TETRA sub-domain (one TETRA network).
source SwMI: Switching and Management Infrastructure where the sending ANF-ISI entity is located (in the context of
a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
subscriber: user of a telecommunication service, based on a contract with the provider of the service
NOTE 1: The subscriber may be an individual or a group: in the first case it is identified by an ITSI, in the second,
by a GTSI.
NOTE 2: The individual subscriber is able to access an SwMI either through a MS or Line Station.
supplementary service: service which modifies or supplements a basic bearer service or a basic teleservice
NOTE: A supplementary service cannot be offered to a customer as a stand-alone service. It should be offered in
combination with a bearer service or a teleservice.
Switching and Management Infrastructure (SwMI): all of the TETRA equipment for a Voice plus Data (V+D)
network
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11 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
terminating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the called user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
terminates a Call independent signalling connection
TETRA Subscriber Identity (TSI): global TETRA network address that is to identify an individual or a group
subscriber within the domain of all TETRA networks
user: entity using the services of a telecommunications network via an externally accessible service access point
NOTE: An individual user may be a person or an application process.
user information: TETRA coded speech
visited SwMI: TETRA network which MNI is not equal to the user's or the group's MNI
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ANF Additional Network Feature
ANF-ISI all Additional Network Features of the Inter-System Interface
APDU Application Protocol Data Unit
ASN.1 Abstract Syntax Notation One
C Conditional
E.1 E-carrier signal level 1, 2 048 kbit/s
ECMA European Computer Manufacturers Association
GFP Generic Functional Protocol
GFT Generic Functional Transport
GTSI Group TETRA Subscriber Identity
HDLC High-level Data Link Control
ISI Inter-System Interface
ISIIC Inter System Interface Individual Call
ISIGC Inter System Interface Group Call
ISIMM Inter System Interface Mobility Management
ISISDS Inter System Interface Short Data Service
ISISS Inter System Interface Supplementary Services
ISSI Individual Short Subscriber Identity
ITSI Individual TETRA Subscriber Identity
LAPD Link Access Procedure for the D-Channel
M Mandatory
MCC Mobile Country Code
MM Mobility Management
MNC Mobile Network Code
MNI Mobile Network Identity
MRS Mobile Radio Stack
MS Mobile Station
NFE Network Facility Extension
O Optional
PC Protocol Control
PDU Protocol Data Unit
PINX Private Integrated Network eXchange
PISN Private Integrated Services Network
PSS1 Private Signalling System 1
ROSE Remote Operation Service Element
SDL Specification and Description Language
SDS Short Data Service
SSE Segmentation Service Element
ETSI
12 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
SSI Short Subscriber Identity
SwMI TETRA Switching and Management Infrastructure
TSI TETRA Subscriber Identity
TX Transmit
V+D Voice plus Data
4 Usage of Private Signalling System 1 (PSS1) for
TETRA
4.1 PSS1 Functionality
The TETRA ISI application can use the PSS1 protocol stack for interconnecting Private Integrated Network eXchanges
(PINXs) to form Private Integrated Services Network (PISN). PSS1 is the ISO term; the PSS1 protocol is also known,
informally, as QSIG, generic term created by the European Computer Manufacturers Association (ECMA) which
developed most of the signalling protocols comprised in the PSS1 protocol.
TETRA uses the standard functionalities defined for PSS1:
• signalling for the support of circuit-mode basic services (see note);
• Generic Functional Protocol (GFP) originally defined for the support of supplementary services.
NOTE: The definition of PSS1 basic call is in ISO/IEC 11572 [9].
4.2 Protocol stack for signalling information
Figure 4.1 shows how the protocols for TETRA ANF, which apply at the ISI, are built on top of the PSS1 protocol
stack. The ISI APDU is used to convey ANF-ISI Protocol Data Units (PDU). The definition of ISI APDUs and the
handling of ISI APDUs in ETSI EN 300 392-3-9 [2] is a subset of the ROSE protocol description according to
Recommendation ITU-T X.882 [i.1] and are treated as ROSE APDUs in the PSS1 messages.
SwMI- 1 SwMI- 2
TETRA ANF
TETRA ANF
Specific TETRA operations Specific TETRA operations
ISO /IEC 11582 ISO/IEC 11582
ISO /IEC 11572 ISO/ IEC11572
ETS 300 402- 1 and 2 ETS 300 402- 1 and 2
Layer 1 Layer 1
NOTE: Layer 2 protocol depends on the type of the inter-connection.
Figure 4.1: PSS1 protocol stack for TETRA
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13 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
The protocol stack shown in figure 4.1 is for signalling information exchange on the common signalling channel
i.e. D-channel. LAPD framing as defined in ETSI ETS 300 402-1 [7] and ETSI ETS 300 402-2 [8] and E.1, refer to
Recommendation ITU-T G.704 [11], common signalling channel 16 shall be used. Protocol stack for user information
exchange is presented in clause 4.4.
4.3 Generic Functional Protocol (GFP)
The GFP as defined in ISO/IEC 11582 [10] shall be used for all TETRA ANFs of the ISI (ANF-ISI).
ISI operations shall be used to convey ANF-ISI information in Facility information elements, as described in clause 5.
These Facility information elements shall be included in PSS1 messages in accordance with ISO/IEC 11582 [10]. The
specification given in clause 7.1.1.1 of ISO/IEC 11582 [10] as to when an SwMI can send a PSS1 FACILITY message
at the earliest shall be understood as follows:
• such message can be sent by a receiving SwMI after it has sent a PSS1 CALL PROCEEDING message
(following reception of a PSS1 SETUP message);
• such message can be sent by a source SwMI after it has received one of the following PSS1 messages:
FACILITY, PROGRESS, ALERTING, CONNECT.
When the call independent signalling connection is used, it shall be connection oriented.
NOTE: This is in line with the choice made for the definition of all existing supplementary services of the PSS1
protocols.
4.4 Protocol stack for user information
Call control manages transportation of user information e.g. TETRA coded speech on B channels as presented in
Q
figure 4.2. In this protocol stack the E.1 channels are 64 kbit/s channels supporting unrestricted digital information,
refer to Recommendation ITU-T G.704 [11].
TETRA Call control Call control TETRA
coded user signalling signalling coded user
information information
HDLC LAPD LAPD HDLC
framing framing framing framing
E.1 E.1 Common E.1 E.1
channel channel 16 channel channel 16 channel
selection (PSS1) signalling (PSS1) selection
E.1 User information E.1
channel 1 channel 1
etc. etc. etc.
E.1 User information E.1
channel 31 channel 31
Figure 4.2: User information protocol stack
For speech transmission the TETRA coded user information is speech frames that shall be carried in an B channel
Q
using HDLC frames, refer to ETSI EN 300 392-3-8 [1], annex B. The call control negotiates the B channel for each
Q
call instance and locally select the negotiated B channel. The mapping between TETRA ISI channels and B channels
Q Q
is defined in ETSI EN 300 392-3-8 [1], annex A. Call control signalling (ETSI EN 300 392-3-12 [3] and ETSI
EN 300 392-3-13 [4]), LAPD framing (ETSI ETS 300 402-1 [7] and ETSI ETS 300 402-2 [8]) and E.1 common
signalling channel 16 are presented in figure 4.1 for call control.
ETSI
14 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
All or a sub-set of B channels 1 to 15 and 17 to 31 shall be considered to be available for user information transport as
Q
negotiated at the PSS1 connection negotiation. It can be assumed that the B channels are physically connected at the
Q
same time as the LAPD connection is set-up on the common control channel and there shall be no additional E.1
channel set-up signalling at the link layer.
4.5 User information encoding at the ISI
Whether in a group call or in an individual call, the user information shall be sent over ISI user information
connections, which will be considered as B channels by the PSS1 protocols used to establish these calls.
Q
It has been assumed that these connections will be digital, their standard data rate being 64 kbit/s.
Clause 4.4 presents the protocol stack for user information transport and its relation to the call control.
5 ISI Generic Functional Protocol (ISI GFP)
5.1 Protocol model
The TETRA ISI over E.1 is based on the PSS1 protocols stack in order to enable the interconnection of SwMIs through
a PISN. Signalling needs for TETRA ISI operation, which are not directly supported by PSS1 basic call protocols, are
provided by ISI Mediation Function.
The ISI Mediation Function does not by itself control sending of any ANF-ISI PDUs but rather provides a means to
convey them.
ETSI
15 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
Figure 5.1 shows the conceptual model of the ISI GFP. The generic ISI Mediation Function includes a Call Control
function, a Coordination Function, ROSE (implementing the PDU Identification service), a Segmentation Service (for
segmentation of messages) and the Generic Functional Transport Control (implementing the Connection Service).
ROSE: Remote Operation Service
SSE: Segmentation Service
GFT: Generic Functional Transport
Figure 5.1: Protocol model of the ISI Generic Functional Protocol
The entities PSS1 Protocol Control (PC), Generic Functional Transport Control (GFT Control), Co-ordination Function,
Call Control and ROSE shall exist in any E.1 based SwMI which supports the ISI. The existence in a SwMI of the other
entities shown on figure 5.1 shall depend on the ANF-ISIs supported by this SwMI.
5.2 Services provided by the protocol model entities
ANF entities (i.e. ANF-ISIIC, ANF-ISIGC, ANF-ISISDS, ANF-ISISS and ANF-ISIMM entities) use the services of the
ROSE entity via the Coordination Function in order to convey ANF-ISI PDUs between TETRA networks.
ISI Application Protocol Data Units (ISI APDUs) are carried inside the Facility information elements, as described in
clause 4.3. These Facility information elements shall be included in PSS1 messages in accordance with
ISO/IEC 11582 [10].
The ISI APDUs shall be those specified in ETSI EN 300 392-3-9 [2]. As ROSE is used as network protocol in Facility
information elements the ISI APDUs are treated as ROSE APDUs in the PSS1 messages.
If an ISI APDU is call independent and its length exceeds its possible maximum, the Coordination Function shall
address it to the Segmentation Service Element (SSE) so that this ISI APDU can be transparently transported in spite of
its length (see clause 5.6). The same shall apply for a call related ISI APDU with a length exceeding its possible
maximum provided that it does not have to be sent in a specific PSS1 basic call message.
ETSI
16 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
ROSE and SSE shall use the connection oriented services of GFT Control as defined in clause 6.7.1 of
ISO/IEC 11582 [10], via the Coordination Function. GFT Control in turn shall use the PSS1 Protocol Control (PC)
services as defined in clause 6.8 of ISO/IEC 11582 [10]. GFT control provides services to establish and release of Call
independent signalling connections and also transport services for the carriage of call related or call independent ISI
APDUs between different PINXs. The corresponding PISN protocols are defined in clauses 7.1 and 7.3 of
ISO/IEC 11582 [10]. The interaction between ROSE users (ISI-ANFs), ROSE itself, SSE and GFT Control is
co-ordinated by the Coordination Function.
ANF-ISIIC and ANF-ISIGC use PC services for sending PSS1 call messages over PISN as defined in
ISO/IEC 11572 [9]. They also use the extensions of PC services and the connection oriented services of GFT Control
together with the services of ROSE and of the Coordination Function to convey their PDUs, as defined in
ISO/IEC 11582 [10] to convey ISI APDUs. The ANF-ISIIC and ANF-ISIGC PDUs carry either:
• complementary TETRA call information, in PSS1 basic call messages; or
• TETRA call related messages, in PSS1 FACILITY messages.
ANF-ISIMM and ANF-ISISDS also use the extensions of PC services and the connection oriented services of
GFT Control together with the services of ROSE and of the Coordination Function to convey their PDUs, as defined in
ISO/IEC 11582 [10]. However the procedures which apply for the transport of the ISI APDUs conveying their PDUs
are the connection oriented call independent procedures defined in clause 7.3 of ISO/IEC 11582 [10].
NOTE 1: No PSS1 call related procedures, as defined in clause 7.1 of ISO/IEC 11582 [10], apply for transmitting
the ISI APDUs conveying the ANF-ISIMM PDUs because all MM information is TETRA call
independent and no need has been found to send any of that exchanged between SwMIs (over their ISIs)
as PISN user information (i.e. using a B channel, possibly more, as transmission channel for the
Q
ANF-ISIMM PDUs). Similarly for ANF-ISISDS, no need has been found to send any of the SDS
information exchanged between SwMIs (over their ISIs) as PISN user information (i.e. using a B
Q
channel, possibly more, as transmission channel for the ANF-ISISDS PDUs): i.e. although from a formal
point of view the sending of SDS messages can be considered as a TETRA call (in taking the definition of
a call as being the instance of a basic service and considering that SDS is a TETRA basic service), the
decision has been taken not to establish any PISN call to convey SDS information over the ISI.
NOTE 2: According to the definition of the connection oriented call independent procedures in
ISO/IEC 11582 [10], ISI APDUs conveying call independent ANF-ISI PDUs (e.g. ANF-ISIMM or
ANF-ISISDS PDUs) may be sent in the PSS1 messages which establish the related call independent
signalling connection.
ANF-ISISS uses the same services as ANF-ISIMM and ANF-ISISDS for its call independent procedures. It uses the
connection oriented services of GFT Control and the related extensions of PC services, both as defined in
ISO/IEC 11582 [10], for its call related procedures.
NOTE 3: The latter statement implies that ANF-ISISS uses the signalling connections of either ANF-ISIIC or
ANF-ISIGC for its call related procedure.
5.3 Addressing and Message Content
5.3.1 PSS1 Message Content
5.3.1.1 PISN Addressing
When PINXs are connected together within a Private Integrated Services Network (PISN) then according to
ISO/IEC 11572 [9] the Called party number and Calling Party Number are used to route the PSS1 messages between
the source and the destination PINX possibly via one or several transit PINX(s). Each TETRA SwMI shall in that case
be assigned at least one PISN number.
PSS1 SETUP messages shall be include a PISN number of with the source SwMI as Calling Party Number and a PISN
number of the destination SwMI PISN numbers as Called Party Number.
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17 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
If a call is forward switched the PISN number of the forward switching SwMI (i.e. source SwMI of second PSS1
SETUP message) shall be included as Calling Party Number in the PSS1 SETUP message between the forward
switching SwMI and the terminating SwMI (i.e. destination SwMI of the second PSS1 SETUP message).
The PISN numbers to address the correct PINX of another TETRA network can be obtained as follows:
• received inside a TETRA PDU in some previous message exchange (more precisely, the PISN number will
have been received in ANF-ISIMM in relation to the migration of the MS; or
• defined by a routing table on the basis of the SwMI MNI.
The PISN numbers defined above shall always correspond to SwMIs or SwMI entities, and never to any TETRA
subscriber. A TETRA individual subscriber shall be addressed using its ITSI and a TETRA group using its GTSI. This
ITSI or GTSI shall thus have to be included in the ANF-ISI PDUs whenever needed.
NOTE: If there is a semi-permanent E1 connection between two TETRA SwMIs, the use of the PISN numbers of
Calling Party Number and Called Party Number information elements are not applicable for routing
purposes. However the information elements have to be always present in PSS1 Setup message.
5.3.1.2 Basic PSS1 Parameter Content
The following rules shall apply for information elements of the PSS1 SETUP message:
• The sending complete information element shall always be included (no overlap sending supported).
• No progress indicator information element shall be included.
• The numbering plan identification shall be
...
SLOVENSKI STANDARD
01-julij-2020
Prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - 3. del: Medsebojno
delovanje na medsistemskem vmesniku (ISI) - 10. poddel: Konstrukcija, splošno,
PSS1 nad E.1
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
Ta slovenski standard je istoveten z: ETSI EN 300 392-3-10 V1.2.1 (2020-04)
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
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 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
Reference
REN/TCCE-03258
Keywords
management, mobility, TETRA
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ETSI
3 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 11
3.3 Abbreviations . 11
4 Usage of Private Signalling System 1 (PSS1) for TETRA . 12
4.1 PSS1 Functionality . 12
4.2 Protocol stack for signalling information . 12
4.3 Generic Functional Protocol (GFP) . 13
4.4 Protocol stack for user information . 13
4.5 User information encoding at the ISI . 14
5 ISI Generic Functional Protocol (ISI GFP) . 14
5.1 Protocol model . 14
5.2 Services provided by the protocol model entities . 15
5.3 Addressing and Message Content . 16
5.3.1 PSS1 Message Content . 16
5.3.1.1 PISN Addressing . 16
5.3.1.2 Basic PSS1 Parameter Content . 17
5.3.1.3 Facility Information Element Parameter Content. 18
5.3.2 Transport of ISI APDUs . 19
5.3.2.1 General . 19
5.3.2.2 PSS1 Messages Used for Call related Services . 19
5.3.2.3 PSS1 Messages Used for Call Independent Services . 20
5.4 Procedures . 21
5.4.1 General . 21
5.4.2 Connection Initiation . 21
5.4.2.1 Call Independent Signalling . 21
5.4.2.2 Call Related Signalling . 22
5.4.3 Transport of ISI APDUs in PSS1 FACILITY. 23
5.4.4 Transport of ISI Group Call Signalling. 23
5.4.4.1 SwMI Roles for Group Call . 23
5.4.4.1.1 Definition of SwMI Roles for Group Call . 23
5.4.4.1.2 Requirements on the originating SwMI . 23
5.4.4.1.3 Requirements on the group home SwMI . 24
5.4.4.1.4 Requirements on the controlling SwMI . 24
5.4.4.1.5 Requirements on the participating SwMI . 24
5.4.4.2 Binding Rules . 25
5.4.4.3 Sequences . 26
5.4.5 Transport of ISI Individual Call Signalling . 28
5.4.5.1 SwMI Roles for Individual Call . 28
5.4.5.2 Requirements on the originating SwMI . 28
5.4.5.3 Requirements on the destination SwMI . 28
5.4.5.4 Call Restoration . 29
5.4.5.5 Binding Rules . 29
5.4.5.6 Sequences . 30
5.4.6 Error Handling . 31
5.4.7 Call Release . 35
5.4.7.1 Release of a Call Independent Connection . 35
ETSI
4 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
5.4.7.2 Release of a Call Related Connection . 35
5.5 ISI GFP requirements and operation definition . 37
5.6 Segmentation Service Element (SSE) . 37
5.6.1 Procedures. 37
5.6.2 Requirements for procedures . 38
5.6.2.1 Requirements for the segmentation procedure . 38
5.6.2.2 Requirements for the re-assembly procedure . 38
5.6.3 Segment encoding . 39
5.7 Co-ordinationFunction . 39
Annex A (informative): PSS1 Message Content . 41
A.1 Maximum length of an ISI APDU or a SSE segment encoded in a facility information element . 41
A.2 Example of the encoding of an ANF-ISIMM MIGRATION RESPONSE PDU in an ISI Invoke
APDU in a PSS1 FACILITY PDU . 41
Annex B (informative): Bibliography . 43
Annex C (informative): Change requests . 44
History . 45
ETSI
5 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
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 European Standard (EN) has been produced by ETSI Technical Committee TETRA and Critical Communications
Evolution (TCCE).
The present document is part 3, sub-part 10 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
6 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
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";
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.
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.
The present document is based on ETSI EN 300 392-3-1 [i.2]. The main differences are:
• General information about ISI is included in ETSI EN 300 392-3-9 [2].
• Information about ISI APDU to PSS1 message mapping is added.
• Signalling sequences are added.
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.
National transposition dates
Date of adoption of this EN: 13 November 2019
Date of latest announcement of this EN (doa): 31 July 2020
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 January 2021
Date of withdrawal of any conflicting National Standard (dow): 31 January 2021
ETSI
7 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
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
8 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
1 Scope
The present document defines the transport of the Inter-System Interface (ISI) using PSS1 as transport layer. It
specifies:
• the PSS1 signalling used for transport of ISI APDUs; and
• the general protocol mechanism, called ISI Mediation Function which coordinates the communication between
TETRA systems.
The ISI Mediation Function applies to any TETRA Switching and Management Infrastructure (SwMI) which supports
the ISI.
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 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 300 392-3-8: "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".
[2] ETSI EN 300 392-3-9: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 9: Transport layer independent,
General design".
[3] ETSI EN 300 392-3-12: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 12: Transport layer independent
Additional Network Feature Individual Call (ANF-ISIIC)".
[4] ETSI EN 300 392-3-13: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D);
Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 13: Transport layer independent
Additional Network Feature Group Call (ANF-ISIGC)".
[5] Void.
[6] Void.
[7] ETSI ETS 300 402-1: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Data link layer; Part 1: General aspects [ITU-T
Recommendation Q.920 (1993), modified]".
[8] ETSI ETS 300 402-2: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Data link layer; Part 2: General protocol specification [ITU-T
Recommendation Q.921 (1993), modified]".
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9 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
[9] ISO/IEC 11572: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Network -- Circuit mode bearer services --
Inter-exchange signalling procedures and protocol".
[10] ISO/IEC 11582: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Network -- Generic functional protocol for the
support of supplementary services -- Inter-exchange signalling procedures and protocol".
[11] Recommendation ITU-T G.704: "Synchronous frame structures used at 1544, 6312, 2048, 8448
and 44 736 kbit/s hierarchical levels".
[12] Recommendation ITU-T Q.931: "ISDN user-network interface layer 3 specification for basic call
control".
[13] Void.
[14] ISO/IEC 11571: "Information technology -- Telecommunications and information exchange
between systems -- Private Integrated Services Networks -- Addressing".
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 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 X.882: "Information technology - Remote Operations: OSI realizations -
Remote Operations Service Element (ROSE) protocol specification".
[i.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 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ISO/IEC 11582 [10] and the following apply:
call independent: property of information which is conveyed between SwMIs on a signalling connection which is not
related to an audio call
call independent signalling connection: signalling connection established between ANF-ISI entities located in
different Switching and Management Infrastructures is not related to audio calls
co-ordination Function: entity which provides co-ordination between different ANF-ISI entities, ROSE, SSE and
GFT Control for different TETRA basic and supplementary services
destination SwMI: Switching and Management Infrastructure where the receiving ANF-ISI entity is located (in the
context of a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
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10 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
Generic Functional Transport Control (GFT Control) entity: entity that exists within a Switching and Management
Infrastructure and provides a range of services to the ANF-ISI entities and ROSE via the co-ordination Function
NOTE: The services are defined in clause 6 of ISO/IEC 11582 [10].
group attached SwMI: Switching and Management Infrastructure different from the home SwMI of the group
considered in which at least one individual subscriber member of the group is attached to that group
Group TETRA Subscriber Identity (GTSI): TETRA Subscriber Identity assigned to a group
home SwMI: Switching and Management Infrastructure in which the subscription of a given user is registered
NOTE: That user is defined as being a subscriber (see below the definition of that term).
invocation: action taken by the user or by the service provider to execute a specific service function within real time
ISI Mediation Function: entity which provides to different ANF-ISI entities the services that are not supported by the
transport layer protocol
Location Area (LA): area within radio coverage of a base station or group of base stations within which a Mobile
Station (MS) is allowed to operate
Mobile Network Identity (MNI): identity that uniquely identifies the SwMI
NOTE: It consists of the Mobile Country Code (MCC) and the Mobile Network Code (MNC).
Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA
services
NOTE: By definition, a mobile station contains at least one Mobile Radio Stack (MRS).
originating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the calling user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
originates a Call independent signalling connection
PISN number: number that unambiguously identifies the addressed PINX or an addressable entity associated with that
PINX as defined in ISO/IEC 11571 [14]
segmentation: act of generating two or more PDUs derived from one ISI PDU
semi-permanent connection: logical connection between two network nodes (SwMIs)
service user: abstract representation of the totality of those entities in a single system that makes use of a service
through a single access point
Short Subscriber Identity (SSI): network specific portion of a TSI
NOTE: A SSI is only unique within one TETRA sub-domain (one TETRA network).
source SwMI: Switching and Management Infrastructure where the sending ANF-ISI entity is located (in the context of
a single one-way exchange of information between two ANF-ISI entities located in different Switching and
Management Infrastructures)
subscriber: user of a telecommunication service, based on a contract with the provider of the service
NOTE 1: The subscriber may be an individual or a group: in the first case it is identified by an ITSI, in the second,
by a GTSI.
NOTE 2: The individual subscriber is able to access an SwMI either through a MS or Line Station.
supplementary service: service which modifies or supplements a basic bearer service or a basic teleservice
NOTE: A supplementary service cannot be offered to a customer as a stand-alone service. It should be offered in
combination with a bearer service or a teleservice.
Switching and Management Infrastructure (SwMI): all of the TETRA equipment for a Voice plus Data (V+D)
network
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11 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
terminating SwMI: in the context of a TETRA call, Switching and Management Infrastructure where the called user is
registered (which implies that this user is located in that SwMI) or Switching and Management Infrastructure which
terminates a Call independent signalling connection
TETRA Subscriber Identity (TSI): global TETRA network address that is to identify an individual or a group
subscriber within the domain of all TETRA networks
user: entity using the services of a telecommunications network via an externally accessible service access point
NOTE: An individual user may be a person or an application process.
user information: TETRA coded speech
visited SwMI: TETRA network which MNI is not equal to the user's or the group's MNI
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ANF Additional Network Feature
ANF-ISI all Additional Network Features of the Inter-System Interface
APDU Application Protocol Data Unit
ASN.1 Abstract Syntax Notation One
C Conditional
E.1 E-carrier signal level 1, 2 048 kbit/s
ECMA European Computer Manufacturers Association
GFP Generic Functional Protocol
GFT Generic Functional Transport
GTSI Group TETRA Subscriber Identity
HDLC High-level Data Link Control
ISI Inter-System Interface
ISIIC Inter System Interface Individual Call
ISIGC Inter System Interface Group Call
ISIMM Inter System Interface Mobility Management
ISISDS Inter System Interface Short Data Service
ISISS Inter System Interface Supplementary Services
ISSI Individual Short Subscriber Identity
ITSI Individual TETRA Subscriber Identity
LAPD Link Access Procedure for the D-Channel
M Mandatory
MCC Mobile Country Code
MM Mobility Management
MNC Mobile Network Code
MNI Mobile Network Identity
MRS Mobile Radio Stack
MS Mobile Station
NFE Network Facility Extension
O Optional
PC Protocol Control
PDU Protocol Data Unit
PINX Private Integrated Network eXchange
PISN Private Integrated Services Network
PSS1 Private Signalling System 1
ROSE Remote Operation Service Element
SDL Specification and Description Language
SDS Short Data Service
SSE Segmentation Service Element
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12 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
SSI Short Subscriber Identity
SwMI TETRA Switching and Management Infrastructure
TSI TETRA Subscriber Identity
TX Transmit
V+D Voice plus Data
4 Usage of Private Signalling System 1 (PSS1) for
TETRA
4.1 PSS1 Functionality
The TETRA ISI application can use the PSS1 protocol stack for interconnecting Private Integrated Network eXchanges
(PINXs) to form Private Integrated Services Network (PISN). PSS1 is the ISO term; the PSS1 protocol is also known,
informally, as QSIG, generic term created by the European Computer Manufacturers Association (ECMA) which
developed most of the signalling protocols comprised in the PSS1 protocol.
TETRA uses the standard functionalities defined for PSS1:
• signalling for the support of circuit-mode basic services (see note);
• Generic Functional Protocol (GFP) originally defined for the support of supplementary services.
NOTE: The definition of PSS1 basic call is in ISO/IEC 11572 [9].
4.2 Protocol stack for signalling information
Figure 4.1 shows how the protocols for TETRA ANF, which apply at the ISI, are built on top of the PSS1 protocol
stack. The ISI APDU is used to convey ANF-ISI Protocol Data Units (PDU). The definition of ISI APDUs and the
handling of ISI APDUs in ETSI EN 300 392-3-9 [2] is a subset of the ROSE protocol description according to
Recommendation ITU-T X.882 [i.1] and are treated as ROSE APDUs in the PSS1 messages.
SwMI- 1 SwMI- 2
TETRA ANF
TETRA ANF
Specific TETRA operations Specific TETRA operations
ISO /IEC 11582 ISO/IEC 11582
ISO /IEC 11572 ISO/ IEC11572
ETS 300 402- 1 and 2 ETS 300 402- 1 and 2
Layer 1 Layer 1
NOTE: Layer 2 protocol depends on the type of the inter-connection.
Figure 4.1: PSS1 protocol stack for TETRA
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13 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
The protocol stack shown in figure 4.1 is for signalling information exchange on the common signalling channel
i.e. D-channel. LAPD framing as defined in ETSI ETS 300 402-1 [7] and ETSI ETS 300 402-2 [8] and E.1, refer to
Recommendation ITU-T G.704 [11], common signalling channel 16 shall be used. Protocol stack for user information
exchange is presented in clause 4.4.
4.3 Generic Functional Protocol (GFP)
The GFP as defined in ISO/IEC 11582 [10] shall be used for all TETRA ANFs of the ISI (ANF-ISI).
ISI operations shall be used to convey ANF-ISI information in Facility information elements, as described in clause 5.
These Facility information elements shall be included in PSS1 messages in accordance with ISO/IEC 11582 [10]. The
specification given in clause 7.1.1.1 of ISO/IEC 11582 [10] as to when an SwMI can send a PSS1 FACILITY message
at the earliest shall be understood as follows:
• such message can be sent by a receiving SwMI after it has sent a PSS1 CALL PROCEEDING message
(following reception of a PSS1 SETUP message);
• such message can be sent by a source SwMI after it has received one of the following PSS1 messages:
FACILITY, PROGRESS, ALERTING, CONNECT.
When the call independent signalling connection is used, it shall be connection oriented.
NOTE: This is in line with the choice made for the definition of all existing supplementary services of the PSS1
protocols.
4.4 Protocol stack for user information
Call control manages transportation of user information e.g. TETRA coded speech on B channels as presented in
Q
figure 4.2. In this protocol stack the E.1 channels are 64 kbit/s channels supporting unrestricted digital information,
refer to Recommendation ITU-T G.704 [11].
TETRA Call control Call control TETRA
coded user signalling signalling coded user
information information
HDLC LAPD LAPD HDLC
framing framing framing framing
E.1 E.1 Common E.1 E.1
channel channel 16 channel channel 16 channel
selection (PSS1) signalling (PSS1) selection
E.1 User information E.1
channel 1 channel 1
etc. etc. etc.
E.1 User information E.1
channel 31 channel 31
Figure 4.2: User information protocol stack
For speech transmission the TETRA coded user information is speech frames that shall be carried in an B channel
Q
using HDLC frames, refer to ETSI EN 300 392-3-8 [1], annex B. The call control negotiates the B channel for each
Q
call instance and locally select the negotiated B channel. The mapping between TETRA ISI channels and B channels
Q Q
is defined in ETSI EN 300 392-3-8 [1], annex A. Call control signalling (ETSI EN 300 392-3-12 [3] and ETSI
EN 300 392-3-13 [4]), LAPD framing (ETSI ETS 300 402-1 [7] and ETSI ETS 300 402-2 [8]) and E.1 common
signalling channel 16 are presented in figure 4.1 for call control.
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14 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
All or a sub-set of B channels 1 to 15 and 17 to 31 shall be considered to be available for user information transport as
Q
negotiated at the PSS1 connection negotiation. It can be assumed that the B channels are physically connected at the
Q
same time as the LAPD connection is set-up on the common control channel and there shall be no additional E.1
channel set-up signalling at the link layer.
4.5 User information encoding at the ISI
Whether in a group call or in an individual call, the user information shall be sent over ISI user information
connections, which will be considered as B channels by the PSS1 protocols used to establish these calls.
Q
It has been assumed that these connections will be digital, their standard data rate being 64 kbit/s.
Clause 4.4 presents the protocol stack for user information transport and its relation to the call control.
5 ISI Generic Functional Protocol (ISI GFP)
5.1 Protocol model
The TETRA ISI over E.1 is based on the PSS1 protocols stack in order to enable the interconnection of SwMIs through
a PISN. Signalling needs for TETRA ISI operation, which are not directly supported by PSS1 basic call protocols, are
provided by ISI Mediation Function.
The ISI Mediation Function does not by itself control sending of any ANF-ISI PDUs but rather provides a means to
convey them.
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15 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
Figure 5.1 shows the conceptual model of the ISI GFP. The generic ISI Mediation Function includes a Call Control
function, a Coordination Function, ROSE (implementing the PDU Identification service), a Segmentation Service (for
segmentation of messages) and the Generic Functional Transport Control (implementing the Connection Service).
ROSE: Remote Operation Service
SSE: Segmentation Service
GFT: Generic Functional Transport
Figure 5.1: Protocol model of the ISI Generic Functional Protocol
The entities PSS1 Protocol Control (PC), Generic Functional Transport Control (GFT Control), Co-ordination Function,
Call Control and ROSE shall exist in any E.1 based SwMI which supports the ISI. The existence in a SwMI of the other
entities shown on figure 5.1 shall depend on the ANF-ISIs supported by this SwMI.
5.2 Services provided by the protocol model entities
ANF entities (i.e. ANF-ISIIC, ANF-ISIGC, ANF-ISISDS, ANF-ISISS and ANF-ISIMM entities) use the services of the
ROSE entity via the Coordination Function in order to convey ANF-ISI PDUs between TETRA networks.
ISI Application Protocol Data Units (ISI APDUs) are carried inside the Facility information elements, as described in
clause 4.3. These Facility information elements shall be included in PSS1 messages in accordance with
ISO/IEC 11582 [10].
The ISI APDUs shall be those specified in ETSI EN 300 392-3-9 [2]. As ROSE is used as network protocol in Facility
information elements the ISI APDUs are treated as ROSE APDUs in the PSS1 messages.
If an ISI APDU is call independent and its length exceeds its possible maximum, the Coordination Function shall
address it to the Segmentation Service Element (SSE) so that this ISI APDU can be transparently transported in spite of
its length (see clause 5.6). The same shall apply for a call related ISI APDU with a length exceeding its possible
maximum provided that it does not have to be sent in a specific PSS1 basic call message.
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16 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
ROSE and SSE shall use the connection oriented services of GFT Control as defined in clause 6.7.1 of
ISO/IEC 11582 [10], via the Coordination Function. GFT Control in turn shall use the PSS1 Protocol Control (PC)
services as defined in clause 6.8 of ISO/IEC 11582 [10]. GFT control provides services to establish and release of Call
independent signalling connections and also transport services for the carriage of call related or call independent ISI
APDUs between different PINXs. The corresponding PISN protocols are defined in clauses 7.1 and 7.3 of
ISO/IEC 11582 [10]. The interaction between ROSE users (ISI-ANFs), ROSE itself, SSE and GFT Control is
co-ordinated by the Coordination Function.
ANF-ISIIC and ANF-ISIGC use PC services for sending PSS1 call messages over PISN as defined in
ISO/IEC 11572 [9]. They also use the extensions of PC services and the connection oriented services of GFT Control
together with the services of ROSE and of the Coordination Function to convey their PDUs, as defined in
ISO/IEC 11582 [10] to convey ISI APDUs. The ANF-ISIIC and ANF-ISIGC PDUs carry either:
• complementary TETRA call information, in PSS1 basic call messages; or
• TETRA call related messages, in PSS1 FACILITY messages.
ANF-ISIMM and ANF-ISISDS also use the extensions of PC services and the connection oriented services of
GFT Control together with the services of ROSE and of the Coordination Function to convey their PDUs, as defined in
ISO/IEC 11582 [10]. However the procedures which apply for the transport of the ISI APDUs conveying their PDUs
are the connection oriented call independent procedures defined in clause 7.3 of ISO/IEC 11582 [10].
NOTE 1: No PSS1 call related procedures, as defined in clause 7.1 of ISO/IEC 11582 [10], apply for transmitting
the ISI APDUs conveying the ANF-ISIMM PDUs because all MM information is TETRA call
independent and no need has been found to send any of that exchanged between SwMIs (over their ISIs)
as PISN user information (i.e. using a B channel, possibly more, as transmission channel for the
Q
ANF-ISIMM PDUs). Similarly for ANF-ISISDS, no need has been found to send any of the SDS
information exchanged between SwMIs (over their ISIs) as PISN user information (i.e. using a B
Q
channel, possibly more, as transmission channel for the ANF-ISISDS PDUs): i.e. although from a formal
point of view the sending of SDS messages can be considered as a TETRA call (in taking the definition of
a call as being the instance of a basic service and considering that SDS is a TETRA basic service), the
decision has been taken not to establish any PISN call to convey SDS information over the ISI.
NOTE 2: According to the definition of the connection oriented call independent procedures in
ISO/IEC 11582 [10], ISI APDUs conveying call independent ANF-ISI PDUs (e.g. ANF-ISIMM or
ANF-ISISDS PDUs) may be sent in the PSS1 messages which establish the related call independent
signalling connection.
ANF-ISISS uses the same services as ANF-ISIMM and ANF-ISISDS for its call independent procedures. It uses the
connection oriented services of GFT Control and the related extensions of PC services, both as defined in
ISO/IEC 11582 [10], for its call related procedures.
NOTE 3: The latter statement implies that ANF-ISISS uses the signalling connections of either ANF-ISIIC or
ANF-ISIGC for its call related procedure.
5.3 Addressing and Message Content
5.3.1 PSS1 Message Content
5.3.1.1 PISN Addressing
When PINXs are connected together within a Private Integrated Services Network (PISN) then according to
ISO/IEC 11572 [9] the Called party number and Calling Party Number are used to route the PSS1 messages between
the source and the destination PINX possibly via one or several transit PINX(s). Each TETRA SwMI shall in that case
be assigned at least one PISN number.
PSS1 SETUP messages shall be include a PISN number of with the source SwMI as Calling Party Number and a PISN
number of the destination SwMI PISN numbers as Called Party Number.
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17 ETSI EN 300 392-3-10 V1.2.1 (2020-04)
If a call is forward switched the PISN number of the forward switching SwMI (i.e. source SwMI of second PSS1
SETUP message) shall be inclu
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