Universal Mobile Telecommunications System (UMTS); LTE; Tsp interface protocol between the MTC Interworking Function (MTC-IWF) and Service Capability Server (SCS) (3GPP TS 29.368 version 14.4.0 Release 14)

RTS/TSGC-0329368ve40

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Publication Date
09-Oct-2019
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Completion Date
10-Oct-2019
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ETSI TS 129 368 V14.4.0 (2019-10) - Universal Mobile Telecommunications System (UMTS); LTE; Tsp interface protocol between the MTC Interworking Function (MTC-IWF) and Service Capability Server (SCS) (3GPP TS 29.368 version 14.4.0 Release 14)
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ETSI TS 129 368 V14.4.0 (2019-10)
TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
Tsp interface protocol between
the MTC Interworking Function (MTC-IWF)
and Service Capability Server (SCS)
(3GPP TS 29.368 version 14.4.0 Release 14)
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3GPP TS 29.368 version 14.4.0 Release 14 1 ETSI TS 129 368 V14.4.0 (2019-10)
Reference
RTS/TSGC-0329368ve40
Keywords
LTE,UMTS
ETSI
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ETSI
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3GPP TS 29.368 version 14.4.0 Release 14 2 ETSI TS 129 368 V14.4.0 (2019-10)
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.
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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

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Legal Notice

This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).

The present document may refer to technical specifications or reports using their 3GPP identities. These shall be

interpreted as being references to the corresponding ETSI deliverables.

The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.

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
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3GPP TS 29.368 version 14.4.0 Release 14 3 ETSI TS 129 368 V14.4.0 (2019-10)
Contents

Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

Modal verbs terminology .................................................................................................................................... 2

Foreword ............................................................................................................................................................. 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

3 Definitions, symbols and abbreviations ................................................................................................... 7

3.1 Definitions .......................................................................................................................................................... 7

3.2 Symbols .............................................................................................................................................................. 7

3.3 Abbreviations ..................................................................................................................................................... 7

4 Tsp reference point ................................................................................................................................... 7

4.1 Tsp Reference model .......................................................................................................................................... 7

4.2 Functional ele me nts ............................................................................................................................................ 8

4.2.1 SCS ............................................................................................................................................................... 8

4.2.2 MTC-IWF ..................................................................................................................................................... 8

5 Procedures over Tsp reference point ........................................................................................................ 9

5.1 General ............................................................................................................................................................... 9

5.2 Reference number handling ................................................................................................................................ 9

5.3 MTC-IWF selection ........................................................................................................................................... 9

5.4 MTC-IWF load control .................................................................................................................................... 10

5.5 Request and confirmation of a device trigger ................................................................................................... 10

5.6 Notification of Device trigger .......................................................................................................................... 11

5.7 Request and confirmation of a device trigger recall request ............................................................................ 11

5.8 Request and confirmation of a device trigger replace request .......................................................................... 11

5.9 Delivery of a MSISDN-less MO-SMS ............................................................................................................. 12

6 Tsp protocol ............................................................................................................................................ 13

6.1 Protocol support ............................................................................................................................................... 13

6.1.1 Use of Diameter base protocol .................................................................................................................... 13

6.1.2 Transport protocol ...................................................................................................................................... 13

6.1.3 Advertising Application Support ................................................................................................................ 13

6.2 Initialization and maintenance of connection and session ................................................................................ 13

6.3 Security on the Tsp interface ............................................................................................................................ 14

6.3.1 General ........................................................................................................................................................ 14

6.3.2 Mutual authentication ................................................................................................................................. 14

6.3.3 Security profiles .......................................................................................................................................... 14

6.4 Tsp specific AVPs ............................................................................................................................................ 15

6.4.1 General ........................................................................................................................................................ 15

6.4.2 Device-Action AVP .................................................................................................................................... 15

6.4.3 Device-Notification AVP ........................................................................................................................... 16

6.4.4 Trigger-Data AVP ...................................................................................................................................... 16

6.4.5 Payload AVP .............................................................................................................................................. 16

6.4.6 Action-Type AVP ....................................................................................................................................... 16

6.4.7 Priority-Indication AVP .............................................................................................................................. 17

6.4.8 Reference-Number AVP ............................................................................................................................. 17

6.4.9 Request-Status AVP ................................................................................................................................... 17

6.4.10 Delivery-Outcome AVP ............................................................................................................................. 18

6.4.11 Application-Port-Identifier AVP ................................................................................................................ 19

6.4.12 Old-Reference-Number AVP...................................................................................................................... 19

6.4.13 Feature-Supported-In-Final-Target AVP .................................................................................................... 19

6.5 Tsp re-used AVPs ............................................................................................................................................. 20

6.5.1 General ........................................................................................................................................................ 20

6.5.2 Supported-Feature-List AVP ...................................................................................................................... 21

ETSI
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3GPP TS 29.368 version 14.4.0 Release 14 4 ETSI TS 129 368 V14.4.0 (2019-10)

6.5.2.1 Use of the Supported-Features AVP ..................................................................................................... 21

6.5.2.2 Supported-Feature-List AVP for the Tsp application ........................................................................... 21

6.6 Tsp Messages ................................................................................................................................................... 22

6.6.1 Command-Code Values .............................................................................................................................. 22

6.6.2 Device-Action-Request (DAR) command .................................................................................................. 22

6.6.3 Device-Action-Answer (DAA) command .................................................................................................. 22

6.6.4 Device-Notification-Request (DNR) command .......................................................................................... 23

6.6.5 Device-Notification-Answer (DNA) command .......................................................................................... 23

Annex A (informative): Tsp Message Flows......................................................................................... 24

A.1 General ................................................................................................................................................... 24

A.2 Tsp Submission, T4 Delivery ................................................................................................................. 24

A.3 Tsp failed Submission ............................................................................................................................ 25

A.4 Tsp Submission, Failed T4 Delivery ...................................................................................................... 26

A.5 Tsp Recall Submission, Recall Success ................................................................................................. 27

A.6 Tsp Recall Submission, Recall Failure ................................................................................................... 28

A.7 Tsp Replace Submission, Replace Success ............................................................................................ 28

A.8 Tsp Replace Submission, Replace Failure ............................................................................................. 29

A.9 Delivery of a MSISDN-less MO-SMS ................................................................................................... 31

B.1 General ............................................................................................................................................................. 32

B.2 SCS behaviour .................................................................................................................................................. 32

B.3 MTC-IWF behaviour ........................................................................................................................................ 32

Annex C (informative): Change history ............................................................................................... 33

History .............................................................................................................................................................. 34

ETSI
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3GPP TS 29.368 version 14.4.0 Release 14 5 ETSI TS 129 368 V14.4.0 (2019-10)
Foreword

This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).

The contents of the present document are subject to continuing work within the TSG and may change following formal

TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an

identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.

y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,

updates, etc.

z the third digit is incremented when editorial only changes have been incorporated in the document.

ETSI
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3GPP TS 29.368 version 14.4.0 Release 14 6 ETSI TS 129 368 V14.4.0 (2019-10)
1 Scope

The present document provides the stage 3 specification of the Tsp reference point for the present release. The

functional requirements and the stage 2 specifications of the Tsp reference point are contained in TS 23.682 [2]. The

Tsp reference point lies between the Service Capability Server (SCS) and the Machine Type Communication Inter

Working Function (MTC-IWF).
2 References

The following documents contain provisions which, through reference in this text, constitute provisions of the present

document.

- References are either specific (identified by date of publication, edition number, version number, etc.) or

non-specific.
- For a specific reference, subsequent revisions do not apply.

- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including

a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same

Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".

[2] 3GPP TS 23.682: "Architecture enhancements to facilitate communications with packet data

networks and applications".
[3] 3GPP TS 29.329: "Sh Interface based on the Diameter protocol".
[4] IETF RFC 791: "Transmission Control Protocol".
[5] IETF RFC 2234: "Augmented BNF for syntax specifications".
[6] IETF RFC 3588: "Diameter Base Protocol".
[7] IETF RFC 4006: "Diameter Credit Control Application".
[8] IETF RFC 4960: "Stream Control Transmission Protocol".

[9] IETF RFC 5719: "Updated IANA Considerations for Diameter Command Code Allocations".

[10] 3GPP TS 33.210: "Network Domain Security (NDS); IP network layer security".

[11] 3GPP TS 33.310: "Network Domain Security (NDS); Authentication Framework (AF)".

[12] 3GPP TS 29.336: "Home Subscriber Server (HSS) diameter interfaces for interworking with

packet data networks and applications".
[13] 3GPP TS 29.303: "Domain Name System Procedures; Stage 3".
[14] 3GPP TS 23.003: "Numbering, addressing and identification".
[15] 3GPP TS 23.040: "Technical realization of the Short Message Service (SMS)".
[16] 3GPP TS 29.229: "Cx and Dx interfaces based on the Diameter protocol".

[17] 3GPP TS 29.337: "Diameter-based T4 interface for communications with packet data networks

and applications".
[18] IETF RFC 6733: "Diameter Base Protocol".
[19] IETF RFC 8583:”Diameter Load Information Conveyance”.
[20] 3GPP TS 29.338: "Diameter based protocols to support SMS capable MMEs".
ETSI
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3GPP TS 29.368 version 14.4.0 Release 14 7 ETSI TS 129 368 V14.4.0 (2019-10)
3 Definitions, symbols and abbreviations
3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [1] and the following apply. A

term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1].

3.2 Symbols
For the purposes of the present document, no symbols are defined.
3.3 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 [1] and the following apply. An

abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in

TR 21.905 [1].
AVP Attribute Value Pair
CEA Capabilities-Exchange-Answer
CER Capabilities-Exchange-Request
DAA Device-Action-Answer
DAR Device-Action-Request
DNA Device-Notification-Answer
DNR Device-Notification-Request
DNS Domain Name System
ESP Encapsulating Security Payload
IKE Internet Key Exchange
IWF Inter Working Function
MTC Machine Type Communication
PKI Public key infrastructure
SCS Service Capability Server
TLS Transport Layer Security
4 Tsp reference point
4.1 Tsp Reference model

The Tsp reference point is defined between the Service Capability Server (SCS) and the Machine Type Communication

Inter Working Function (MTC-IWF). The relationships between the different functional entities involved are depicted

in figure 4.1.1.
ETSI
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3GPP TS 29.368 version 14.4.0 Release 14 8 ETSI TS 129 368 V14.4.0 (2019-10)
- /
SMS SC
GMSC/
IWMSC
Control plane
User plane
CDF/
HSS
CGF
S6 m Rf/ Ga
MTC IWF
Tsp
Services
Application
Capability
Server
MTC UE Server
SGSN/MME/MSC ( AS )
RAN
(SCS )
Application
LTE- Uu

Figure 4.1.1: Tsp reference point at 3GPP Architecture for Machine -Type Communication

4.2 Functional elements
4.2.1 SCS

The SCS is the entity which connects MTC application servers to the 3GPP network to enable them to communicate

through specific 3GPP defined services with UEs used for MTC and with the MTC-IWF in the HPLMN. The SCS

offers capabilities for use by one or multiple MTC application servers.
An SCS can be connected to one or more MTC-IWFs.
The SCS is controlled by the operator of the HPLMN or by a MTC Service Provider.
4.2.2 MTC-IWF

The MTC-IWF resides in the HPLMN. An MTC-IWF could be a standalone entity or a functional entity of another

network element. The MTC-IWF hides the internal PLMN topology and relays or translates information sent over Tsp

to invoke specific functionality in the PLMN.
An MTC-IWF can be connected to one or more SCSs.
The functionality of the MTC-IWF includes the following:
- terminates the Tsp, S6m, T4 and Rf/Ga reference points;

- supports ability to authorize the SCS before communication establishment with the 3GPP network;

- supports ability to authorize control plane requests from an SCS;
- supports the following device trigger functionality:
- reception of a device trigger request from SCS;
- reception of a device trigger recall/replace request from SCS;

- reporting to the SCS the acceptance or non-acceptance of the device trigger request;

- reporting to the SCS the acceptance or non-acceptance of the device trigger recall/replace request;

- reports to the SCS the success, failure or unconfirmed outcome of a device trigger delivery;

ETSI
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3GPP TS 29.368 version 14.4.0 Release 14 9 ETSI TS 129 368 V14.4.0 (2019-10)

- reports to the SCS the success, failure or unconfirmed outcome of the device trigger recall/replace request;

- provides load control information to SCS as part of the response to trigger requests;

- for MSISDN-less MO-SMS, delivers a payload and application port ID and the external ID of the UE to the

SCS;

- supports ability for secure communication between the 3GPP network and the SCS.

The architecture allows the use of multiple MTC-IWFs within a HPLMN.
5 Procedures over Tsp reference point
5.1 General
The following procedures apply over the Tsp reference point:
- Request and confirmation of a device trigger
- Notification of a device trigger
- Recalling or replacing of an already submitted device trigger
- Delivery of a MSISDN-less MO-SMS
5.2 Reference number handling

The reference number shall be assigned by the SCS. The reference number shall be provided by the SCS to the MTC-

IWF in the first procedure initiated for a specific target of a specific action request (e.g. for a device trigger request

towards a specific MTC device). The MTC-IWF and SCS shall use this reference number for all consecutive related

procedures (e.g. for a confirmation of device trigger and notification of device trigger).

The reference number shall be kept in MTC-IWF and in SCS until all related procedures for a specific target of a

specific action request initiated by the SCS are completed (e.g. until the notification of device trigger is completed).

For each new specific action request other than Device Trigger Recall Request, the SCS shall assign a reference

number, which is different from any other reference number it has previously assigned to any other another action

request with not yet completed related procedures.
5.3 MTC-IWF selection

To discover the MTC-IWF with which to establish the Tsp session, the SCS may use:

- a pre-configured MTC-IWF identity
- DNS
- Diameter routing

For DNS, the Domain Name System procedures as specified in TS 29.303 [13] may be used by the SCS for MTC-IWF

selection. The External Identifier is defined in TS 23.003 [14] and is composed of Domain Identifier and Local

Identifier. The DNS query can be performed deriving the domain name to be resolved from the Domain Identifier part

of the External Identifier.

For Diameter Routeing, the Destination Realm should be derived from the Domain Identifier part of the External

Identifier.
ETSI
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3GPP TS 29.368 version 14.4.0 Release 14 10 ETSI TS 129 368 V14.4.0 (2019-10)
5.4 MTC-IWF load control
Upon receiving a device action request from the SCS:

- if the MTC-IWF determines that the SCS has reached or exceeded the quota of Tsp requests that it is allowed to

send, the MTC-IWF may respond to the SCS with a Device-Action-Answer command containing the Request-

Status AVP with the value set to QUOTAEXCEEDED.

- if the MTC-IWF determines that the SCS has exceeded its rate of initiating Tsp requests, the MTC-IWF may

respond to the SCS with a Device-Action-Answer command containing the Request-Status AVP with a value set

to RATEEXCEEDED.

- if the MTC-IWF is in an overload condition, the MTC-IWF may respond to the SCS with a Device-Action-

Answer command containing the Result-Code AVP with the value set to DIAMETER_TOO_BUSY, see

IETF RFC 6733 [18].

For the above cases, the SCS on receiving the response from MTC-IWF, may provide an indication of the failed

request to the application requesting services to the SCS.

Alternatively, for RATEEXCEEDED and DIAMETER_TOO_BUSY, the SCS may implement a backoff timer which

when running the SCS does not initiate Tsp requests to the MTC-IWF. Once the timer expires, the SCS may attempt to

use the MTC-IWF which was formerly in an overload condition or for which SCS had exceeded the rate of Tsp

requests. The algorithm the SCS uses for the backoff timer is out of scope of the 3GPP specification.

5.5 Request and confirmation of a device trigger

In order to request the MTC-IWF to perform a device trigger, the SCS shall send a Device-Action-Request command

with the following AVP values within the Device-Action AVP:
a) Action-Type AVP set to the value Device Trigger Request (1).

b) Either MSISDN AVP or External-Id AVP set to the identifier of the MTC device to be triggered.

c) SCS-Identity AVP, containing the identity of the SCS that is requesting a device trigger to the UE.

d) Reference-Number AVP, containing a newly assigned reference number the SCS has assigned to the specific

action request.

e) Trigger-Data AVP containing data to be sent to the MTC device with the trigger by the MTC-IWF in the

Payload AVP, priority of the trigger in the Priority-Indication AVP and the triggering application addressed in

the device indicated in the Application-Port-Identifier AVP.

f) Validity-Time AVP, indicating the validity time of the device trigger request since the time the device action

request has been received by the MTC-IWF.

After the MTC-IWF has received from the SCS a Device-Action-Request command with device action set to Device

Trigger Request (1), after receiving the Device-Trigger-Answer from SMS-SC, the MTC-IWF shall confirm the status

of a device trigger request to the SCS by sending a Device-Action-Answer command and shall include the following

AVP values within the Device-Notification AVP:
a) Action-Type AVP set to the value Device Trigger Request (1).

b) Reference-Number AVP, containing the reference number received from the SCS for the specific action request.

c) Request-Status AVP set to value indicating the status of the device trigger request requested by the SCS.

The MTC-IWF may also inclu
...

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