Content for  TS 23.682  Word version:  18.0.0

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1  Scopep. 8

The present document specifies architecture enhancements to facilitate communications with packet data networks and applications (e.g. Machine Type Communication (MTC) applications on the (external) network/MTC servers) according to the use cases and service requirements defined in TS 22.368, TS 22.101, and related 3GPP requirements specifications. Both roaming and non-roaming scenarios are covered.
The present document also specifies transmission of non-IP data via SCEF for the CIoT EPS Optimization.
The present document also specifies the interface between the SCEF and the SCS/AS.
The present document also specifies provisioning of UCMF with RACS information.

2  Referencesp. 8

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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 22.368: "Service Requirements for Machine-Type Communications (MTC)".
TS 22.101: "Service Aspects; Service Principles".
TS 23.003: "Numbering, addressing and identification".
TS 23.002: "Network architecture".
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supporting Packet Based services and Packet Data Networks (PDN)".
TS 29.303: "Domain Name System Procedures; Stage 3".
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
TS 23.272: "Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2".
TS 23.040: "Technical realization of the Short Message Service (SMS)".
TS 23.204: "Support of Short Message Service (SMS) over generic 3GPP Internet Protocol (IP) access; Stage 2".
TR 23.039: "Interface Protocols for the Connection of Short Message Service Centers (SMSCs) to Short Message Entities (SMEs)".
RFC 3588:  "Diameter Base Protocol".
RFC 4960:  "Stream Control Transmission Protocol".
WAP-168-ServiceLoad-20010731-a: "Service Loading".
OMA-TS-Push_MO-V1_0-20110809-A: "OMA Push Management Object".
OMA-TS-Push_Message-V2_2-20110809-A: "Push Message".
OMA-AD-Push-V2_2-20110809-A: "Push Architecture".
TS 23.221: "Architectural requirements".
[22]  Void.
TS 23.142: "Value-added Services for SMS (VAS4SMS); Interface and signalling flow".
TS 29.368: "Tsp interface protocol between the MTC Interworking Function (MTC-IWF) and Service Capability Server (SCS)".
TS 33.187: "Security aspects of Machine-Type and other mobile data applications Communications enhancements".
TS 23.402: "Architecture enhancements for non-3GPP accesses".
TS 23.203: "Policy and charging control architecture".
TS 32.240: "Charging architecture and principles".
TS 23.246: "Multimedia Broadcast/Multicast Service (MBMS); Architecture and functional description".
TS 23.468: "Group Communication System Enablers for LTE (GCSE_LTE); Stage 2".
TS 29.272: "Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) related interfaces based on Diameter protocol".
TS 23.271: "Functional stage 2 description of Location Services (LCS)".
TS 25.304: "User Equipment (UE) procedures in idle mode and procedures for cell reselection in connected mode".
TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode".
TS 23.012: "Location management procedures".
TS 29.128: "Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) interfaces for interworking with packet data networks and applications".
TS 26.346: "MBMS: Protocols and Codecs".
TS 32.278: "Monitoring event charging".
TS 32.253: "Control Plane (CP) data transfer domain charging".
TS 36.306: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio access capabilities".
TS 26.347: "Multimedia Broadcast/Multicast Service (MBMS); Application Programming Interface and URL".
TS 23.222: "Functional architecture and information flows to support Common API Framework for 3GPP Northbound APIs".
TS 29.122: "T8 reference point for northbound Application Programming Interfaces (APIs)".
TS 29.336: "Home Subscriber Server (HSS) diameter interfaces for interworking with packet data networks and applications".
TS 26.348: "Northbound Application Programming Interface (API) for Multimedia Broadcast/Multicast Service (MBMS) at the xMB reference point".
TS 24.250: "Protocol for Reliable Data Service; Stage 3".
TS 23.502: "Procedures for the 5G System (5GS), Stage 2".
TS 29.675: "User Equipment (UE) radio capability provisioning service; Stage 3".
TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".
TS 38.331: "NR; Radio Resource Control (RRC); Protocol specification".

3  Definitions and abbreviationsp. 10

3.1  Definitionsp. 10

For the purposes of the present document, the terms and definitions given in TR 21.905 apply.
For the purposes of the present document, the following terms and definitions given in TS 23.401 apply:

3.2  Abbreviationsp. 10

For the purposes of the present document, the abbreviations given in TR 21.905 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.
Application Server
Charging Data Record
Charging Data Function
Charging Gateway Function
Cellular Internet of Things
Communication Pattern
Downlink Data Notification
Interworking SCEF
Machine Type Communications
Machine Type Communications-InterWorking Function
Non-IP Data Delivery
Policy and Charging Rules Function
PDN Gateway
Packet Flow Description Function
Power Saving Mode
Service Capability Exposure Function
Services Capability Server
Subscriber Location Function
Short Message Entities
Short Message Service-Service Centre
Send Routing Information
UE radio Capability Management Function
Wide Band E-UTRAN

4  Architecture Model and Conceptsp. 11

4.1  General Conceptp. 11

The end-to-end communications, between the MTC Application in the UE and the MTC Application in the external network, uses services provided by the 3GPP system, and optionally services provided by a Services Capability Server (SCS).
The MTC Application in the external network is typically hosted by an Application Server (AS) and may make use of an SCS for additional value added services. The 3GPP system provides transport, subscriber management and other communication services including various architectural enhancements motivated by, but not restricted to, MTC (e.g. control plane device triggering).
Different models are foreseen for machine type of traffic in what relates to the communication between the AS and the 3GPP system (refer to Annex A) and based on the provider of the SCS. The different architectural models that are supported by the Architectural Reference Model in clause 4.2 include the following:
  • Direct Model: The AS connects directly to the operator network in order to perform direct user plane communications with the UE without the use of any external SCS. The Application in the external network may make use of services offered by the 3GPP system;
  • Indirect Model: The AS connects indirectly to the operator network through the services of a SCS in order to utilize additional value added services for MTC (e.g. control plane device triggering). The SCS is either:
    • MTC Service Provider controlled: The SCS is an entity that may include value added services for MTC, performing user plane and/or control plane communication with the UE. Tsp is regarded as an inter-domain interface for control plane communication; or
    • 3GPP network operator controlled: The SCS is a mobile operator entity that may include value added services for MTC and performs user plane and/or control plane communication with the UE, making Tsp a control plane interface internal to the PLMN;
  • Hybrid Model: The AS uses the direct model and indirect models simultaneously in order to connect directly to the operator's network to perform direct user plane communications with the UE while also using a SCS. From the 3GPP network perspective, the direct user plane communication from the AS and any value added control plane related communications from the SCS are independent and have no correlation to each other even though they may be servicing the same MTC Application hosted by the AS.
    When using the hybrid model, the MTC Service provider controlled SCS, and the 3GPP operator controlled SCS may offer different capabilities to the MTC Applications.
Since the different models are not mutually exclusive, but just complementary, it is possible for a 3GPP operator to combine them for different applications. This may include a combination of both MTC Service Provider and 3GPP network operator controlled SCSs communicating with the same PLMN.

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