Content for  TS 33.127  Word version:  18.6.0

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7.5  MMSp. 101

7.5.1  Overviewp. 101

MMS service is defined in TS 22.140, OMA's MMS Architecture OMA-AD-MMS-V1_3-20110913-A [17], and OMA's Multimedia Messaging Service Encapsulation Protocol OMA-TS-MMS_ENC-V1_3-20110913-A [18].
In a 3GPP network, the MMS Proxy-Relay handles the MMS related functions. More specifically, the MMS Proxy-Relay is responsible for:
  1. receiving an MMS from a served UE and forwarding that to the MMS Proxy-Relay of the destination UE;
  2. receiving an MMS from an originating MMS Proxy-Relay and forwarding this MMS or a notification of it to its served UE;
  3. receiving a request for retrieval of an MMS from a served UE and delivering that MMS to the served UE;
  4. providing the served UE with delivery status and read reports of served UE originated MM;
  5. providing an MMS/Relay of another UE with delivery status and read reports of MMS received for the served UE.

7.5.2  LI at MMS Proxy-Relayp. 101  Architecturep. 101

The MMS Proxy-Relay shall have LI capabilities to generate the target UE's MMS related xIRI and xCC.
The IRI-POI present in the MMS Proxy-Relay detects the MMS related events, generates and delivers the related xIRI to the MDF2 over LI_X2. The MDF2 delivers the IRI messages to the LEMF over LI_HI2.
When interception of communication contents is required, the CC-POI present in the MMS Proxy-Relay generates the xCC from the MMS messages and delivers the xCC (that includes the correlation number and the target identity) to the MDF3. The MDF3 delivers the CC to the LEMF over LI_HI3.
Up  Target Identitiesp. 101

The LIPF provisions the intercept related information associated with the following target identities to the IRI-POI/CC-POI present in the MMS Proxy-Relay:
  • Email Address.
  • GPSI.
  • IMPI.
  • IMPU.
  • IMSI.
  • SUPI.
The interception performed on the above identities are mutually independent, even though, an xIRI may contain the information about the other identities when available. The IRI-POI and CC-POI present in the MMS Proxy-Relay shall also support interception of non-local identities in any of the IMPU formats (SIP URI, TEL URI as well as the E.164 number in a SIP URI or TEL URI), GPSI formats (E.164 number, external identifier) and email address.
Up  IRI Eventsp. 102

The IRI-POI present in the MMS Proxy-Relay shall generate xIRI, when it detects the following specific events or information:
  • An MMS message is sent by the target or sent to the target.  Common IRI parametersp. 102

The list of xIRI parameters are specified in TS 33.128. Each xIRI shall include at the minimum the following information:
  • Target identity.
  • Time stamp.
  • Correlation information (when xCC is also reported).
  • MMS related information.  Specific IRI parametersp. 102

The parameters in each xIRI are defined in TS 33.128.  CCp. 102

The MMS xCC is generated when the CC-POI in the MMS Proxy-Relay detects that CC related to an MMS message is either received from the target, sent to the target, or stored on behalf of the target.  Network Topologiesp. 102

LI at the MMS Proxy-Relay is only applicable at the HPLMN.

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