Content for  TS 23.682  Word version:  18.0.0

The Tsp reference point shall fulfil the following requirements:

• connects a MTC-IWF to one or more SCSs;
• supports the following device trigger functionality:
• reception of a device trigger request from SCS that includes an Application Port ID used by the UE to route the trigger internally to the appropriate triggering function;
• report to the SCS the acceptance or non-acceptance of the device trigger request;
• report to the SCS the success or failure of a device trigger delivery; and
• provides congestion/load control information to SCS as part of the response to device trigger requests.
• deliver a payload and application port ID received from the MTC-IWF and the external ID of the UE to SCS.

In addition, Domain Name System procedures similar to what is specified in TS 29.303 may be used by the SCS for lookup and selection of which specific MTC-IWF to be used.

The T4 reference point shall fulfil the following requirements:

• connects the MTC-IWF, taking the role of the SME, to SMS-SC inside HPLMN domain;
• supports the following device trigger functionality:
  • transfer of device trigger, addressed by either an MSISDN or the IMSI, from MTC-IWF to SMS-SC inside HPLMN domain;
  • transfer to the SMS-SC the serving SGSN/MME/MSC identity(ies) along with device trigger when addressed by IMSI; and
  • report to MTC-IWF the submission outcome of a device trigger and the success or failure of delivering the device trigger to the UE.
• supports the delivering of SMS payload to SCS using Short Message Mobile Originated (MO-SMS) procedure via MTC-IWF.

The S6m reference point shall fulfil the following requirements:

• connect the MTC-IWF to HSS/HLR containing subscription and UE related information; and
• support interrogation of HSS/HLR to:
• map E.164 MSISDN or external identifier to IMSI;
  • map IMSI and Application Port ID to external identifier;
  • retrieve serving node information for the UE (i.e. serving SGSN/MME/MSC/IP-SM-GW identities); and
  • determine if a SCS is allowed to send a device trigger to a particular UE.

The S6n reference point shall fulfil the following requirements:

• support communication between MTC-AAA and HSS/HLR containing subscription and UE related information; and
• support interrogation of HSS/HLR to:
  • map between IMSI and External Identifier(s).

The T6a and T6b reference points shall fulfil the following requirements:

• T6a connects the SCEF to the serving MME;
• T6b connects the SCEF to the serving SGSN;
• supports the following functionality:
  • monitoring event configuration by the SCEF at the serving MME/SGSN;
  • monitoring event reporting by the serving MME/SGSN to the SCEF.
  • NIDD to/from the serving MME/SGSN.

The S6t reference point shall fulfil the following requirements:

• connect the SCEF to HSS containing subscription and UE related information;
• monitoring event configuration/deletion by the SCEF at the HSS; and
• monitoring event reporting by the HSS to the SCEF.
• configuration/deletion of communication pattern parameters by the SCEF to HSS.

The T6ai and T6bi reference points shall fulfil the following requirements:

• T6ai connects the IWK-SCEF to the serving MME;
• T6bi connects the IWK-SCEF to the serving SGSN;
• T6ai/T6bi support the following functionality:
  • Monitoring Event reporting by the serving MME/SGSN to the IWK-SCEF;
  • Forwarding of the Monitoring configuration information from the MME/SGSN to the IWK-SCEF.
  • Forwarding of the NIDD configuration information from the MME to the IWK-SCEF;
  • NIDD between the serving MME/SGSN and the IWK-SCEF.

The T7 reference point shall fulfil the following requirements:

• connect the IWK-SCEF to the SCEF for Monitoring Event reporting.
• connect the IWK-SCEF to the SCEF for NIDD service.

The Ns reference points shall fulfil the following requirements:

• Ns connects the SCEF to the RCAF;
• Ns supports the following functionality:
  • request for network status by the SCEF;
  • report of network status by the RCAF to the SCEF.

The Nu reference point shall fulfil the following requirements:

• Nu connects the SCEF to the PFDF;
• Nu supports the following functionality:
  • Provision, modification and removal of a subset or all of the Packet Flow Descriptions (PFDs) in the PFDF according to the instructions received from the SCS/AS.

The T8 reference points shall fulfil the following requirements:

• connect one or more SCEF to one or more SCS/AS;
• use API-based communication model;

The T9a and T9b reference points shall fulfil the following requirements:

• T9a connects the UCMF to an AS;
• T9b connects the UCMF to the SCEF;
• supports the following functionality:
  • provisioning of RACS database information to the UCMF.