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Content for  TS 33.127  Word version:  16.4.0

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7.5  MMS |R16|

7.5.1  Overview

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.
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7.5.2  LI at MMS Proxy-RelayWord‑p. 72

7.5.2.1  Architecture

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.
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7.5.2.2  Target Identities

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:
  • E.164 Number.
  • Email Address.
  • GPSI.
  • IMPI.
  • IMPU.
  • IMSI.
  • Non-Local Id.
  • 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.

7.5.2.3  IRI Events

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.

7.5.2.4  Common IRI parameters

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.

7.5.2.5  Specific IRI parameters

The parameters in each xIRI are defined in TS 33.128.

7.5.2.6  CCWord‑p. 73
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.

7.5.2.7  Network Topologies

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

7.6  PTC service |R16|

7.6.1  General

In the present clause, "PTC" will be used to reference events or services that occur in either of two different architectures unless specified otherwise, e.g., Mission Critical Push To Talk (MCPTT) or Push to talk over Cellular (PoC).
The following servers support PTC architecture:
  • MCPTT servers (Including Common services core as defined in TS 23.280).
  • PoC servers (Including Shared XDMS as defined in OMA-AD-PoC-V2_1-20110802-A [25]).
The PTC server will be used to represent the MCPTT server or PoC server for group communication services.
If two or more different parties involved in a PTC communication are each a target of interception, each interception shall operate independently of the others and the results of each intercept shall be delivered to the respective LEMF in accordance with the applicable warrant.
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7.6.2  Target identities

A provisioned target identity can be the following:
  • MCPTT ID.
  • IMEI.
  • SIP URI.
  • TEL URI.
The interception performed on the above identities are mutually independent, even though, an xIRI may contain the information about the other identities when available.

7.6.3  IRI events

The IRI-POI present in the PTC Server shall generate xIRI when it detects the following specific events or information:
  • PTC service registration.
  • PTC serving system.
  • PTC session initiation.
  • PTC session abandon.
  • PTC session start.
  • PTC session end.
  • PTC start of interception.
  • PTC pre-established Session.
  • PTC instant personal alert.
  • PTC party join.
  • PTC party drop.
  • PTC party hold.
  • PTC party retrieve.
  • PTC media modification.
  • PTC group advertisement.
  • PTC floor control.
  • PTC target presence.
  • PTC associate presence.
  • PTC list management.
  • PTC access policy.
  • PTC media type notification.
  • PTC encryption message.
The events above trigger the transmission of information from the IRI-POI to the MDF2.
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7.6.4  Common IRI parametersWord‑p. 74
Each xIRI shall include at the minimum the following information:
  • Target identity.
  • Time stamp.
  • Correlation information.
  • Location information (if required and available).
  • PTC related information (e.g., PTC group ID, PTC party).
  • Encryption parameters (if required and available).
  • Direction (floor control source or destination port).

7.6.5  Specific IRI parameters

The parameters in each xIRI are defined in TS 33.128.

7.6.6  Common CC parameters

In addition to the intercepted content of communications, the following information needs to be transferred from the CC-POI to the MDF3 in order to allow the MDF3 to perform its functionality:
  • Target identity.
  • Correlation information.
  • Time stamp.
  • Identity of source of media (communications content) for group call.

7.6.7  Specific CC parametersWord‑p. 75
The parameters in xCC are defined in TS 33.128.

7.6.8  Network topologies

The PTC server resides in the home network and shall provide IRI-POI and CC-POI functionality.

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