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Content for  TS 23.281  Word version:  17.5.0

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7.8  MCVideo service configurationWord‑p. 151
The MCVideo service shall support the procedures and related information flows as specified in subclause 10.1 of TS 23.280 with the following clarifications:
  • The MC service client is the MCVideo client;
  • The MC service server is the MCVideo server;
  • The MC service ID is the MCVideo ID; and
  • The MC service user profile index is the MCVideo user profile index.

7.9  Affiliation and de-affiliation to/from MCVideo group(s)

The MCVideo service shall support the procedures and related information flows as specified in subclause 10.8 of TS 23.280 with the following clarifications:
  • The MC service client is the MCVideo client;
  • The MC service server is the MCVideo server;
  • The MC service group is the MCVideo group;
  • The MC service ID is the MCVideo ID; and
  • The MC service group ID is the MCVideo group ID.
When an MCVideo user has affiliated to an MCVideo group then the MCVideo user can send and receive MCVideo related media for that MCVideo group. When an MCVideo user has de affiliated from an MCVideo group then the MCVideo user cannot send and receive MCVideo related media to and from that MCVideo group.
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7.9a  Functional alias management |R16|Word‑p. 152
The MCVideo service shall support the functional alias activation, de-activation, taken over, subscription and notification and functional alias to group binding procedures and related information flows as specified in subclause 10.13 of TS 23.280.
  • The MC service client is the MCVideo client;
  • The MC service server is the MCVideo server;
  • The MC service ID is the MCVideo ID.
  • 7.10  Use of MBMS transmission (on-network) |R17|

    7.10.1  Information flows for MBMS Transmission

    7.10.1.1  General

    Information flows for generic MBMS procedures are defined in TS 23.280.

    7.10.1.2  MapGroupToBearer

    Table 7.10.1.2-1 describes the information flow to associate a MCVideo group call to a MBMS bearer. It is sent from the MCVideo server to the MCVideo client.
    Information Element Status Description
    MCVideo group IDMThis element identifies the MCVideo group, in which the call is started.
    Media stream identifier (video)MThis element identifies the media stream of the SDP used for the Video group call (e.g. MBMS subchannel).
    Media stream identifier (audio)OThis element identifies the audio media stream of the SDP used for the Video group call (e.g. MBMS subchannel). This is used if separate codecs are used for video and audio.
    TMGI (see Note)OThe MBMS bearer identifier if the media of the MCVideo group call is not sent on the same MBMS bearer as this MapGroupToBearer message.
    Call acknowledgement indicatorOIndication that the MCVideo group call requires acknowledgement from receiving MCVideo clients.
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    7.10.1.3  UnmapGroupFromBearerWord‑p. 153
    Table 7.10.1.3-1 describes the information flow to disconnect a MCVideo group call from a MBMS bearer. It is sent from the MCVideo server to the MCVideo client.
    Information Element Status Description
    MCVideo group IDMThis element identifies the MCVideo group which will no longer use the MBMS bearer.
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    7.10.2  Use of pre-established MBMS bearers

    The MCVideo service shall support the procedure for using pre-established MBMS bearers as specified TS 23.280 with the following clarifications:
    • The MC service client is the MCVideo client;
    • The MC service server is the MCVideo server; and
    • The MC service ID is the MCVideo ID.
    The MCVideo service shall use the MCVideo‑1, MCVideo 8 and MCVideo‑9 reference points for this procedure.
    MCVideo may use pre-established MBMS bearer for the different types of MCVideo group calls. Both pre-arranged group calls and chat group calls can use the pre-established MBMS bearer for distributing the media. The MBMS bearer can be used by any group. Depending on the capacity of the MBMS bearer, the bearer can be used to broadcast one or more group calls in parallel.
    Both the media packets as well as the transmission control messages to the receiving MCVideo clients are sent on the MBMS bearer. Optionally a separate MBMS bearer could be used for the transmission control messages, due to different bearer characteristic requirements.
    When using the pre-established MBMS bearer for MCVideo, the MCVideo server perform the procedure of call connect and disconnect over MBMS as defined in subclause 7.10.4 at the group communication session establishment step.
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    7.10.3  Use of dynamic MBMS bearer establishment

    The MCVideo service shall support the procedure for using dynamic MBMS bearers as specified TS 23.280 with the following clarifications:
    • The MC service client is the MCVideo client;
    • The MC service server is the MCVideo server; and
    • The MC service ID is the MCVideo ID.
    The MCVideo service shall use the MCVideo‑1, MCVideo‑4, MCVideo‑7, MCVideo‑8 and MCVideo‑9 reference points for this procedure.
    MCVideo may use dynamic MBMS bearer establishment for the different types of MCVideo group calls. Both pre-arranged group calls and chat group calls can use the dynamic MBMS bearer for distributing the media.
    Both the media packets as well as the transmission control messages to the receiving MCVideo clients are sent on the MBMS bearer.
    When using the procedures for dynamic MBMS bearer establishment for MCVideo, the MCVideo server perform the procedure of mapping group communication to MBMS bearer as defined in subclause 7.10.4 at the group communication session establishment step.
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    7.10.4  Video call connect and disconnect over MBMSWord‑p. 154

    7.10.4.1  General

    MBMS bearer can be used for MCVideo group calls. One MBMS bearer is not permanently associated to one specific group or group call. Before sending media packets of a group call over MBMS bearer, the MCVideo server shall send the association information between group call and the MBMS bearer. The group call setup procedure indicates the media stream or media streams within one MBMS bearer that is used for the specific MCVideo group call. When the group call over the MBMS bearer is finished, this temporary association information of an MCVideo group call to specific resources on a MBMS bearer is undone. The procedure in Figure 7.10.4.2.1-1 requires that the group session is setup before the call start. This eliminates the need for the receiving clients to continuously use a unicast bearer. Prior to this the MBMS bearer is activated and announced to the MCVideo clients.
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    7.10.4.2  Procedure

    7.10.4.2.1  Call connect over MBMS
    In Figure 7.10.4.2.1-1 the MCVideo client 1 is the client that initiate an MCVideo chat group call and also the transmitting client. MCVideo client 1 may, but does not have to be in an MBMS service area. The MCVideo client 2 and MCVideo client 3 represents MCVideo clients receiving the MCVideo call over an MBMS bearer. There may be other receiving clients both over unicast bearers and over this or other MBMS bearer(s), however they are not illustrated in this Figure.
    The same procedure as for chat group call can also be applied for pre-arranged calls.
    Pre-conditions:
    • All users participating in the MCVideo group call are already affiliated to the group.
    • All participating users have joined the group session.
    (not reproduced yet)
    Figure 7.10.4.2.1-1: Chat group call connect on MBMS bearer
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    Step 1.
    Activation and announcement of MBMS bearer availability.
    Step 2.
    MCVideo client 1 initiate the MCVideo group call by sending an initial transmit media request over a unicast bearer to the MCVideo server (reference point MCVideo‑4).
    Step 3.
    The MCVideo server will send a MapGroupToBearer message over a previously activated MBMS bearer to all users that will receive the call over an MBMS bearer. The MapGroupToBearer message includes association information between the group call and MBMS bearer. The MapGroupToBearer message includes MCVideo group ID and information about the media stream identifier or media stream identifiers of the activated MBMS bearer and may include the identifier (i.e. the TMGI) of the MBMS bearer broadcasting the call. The message is sent over reference point MCVideo‑9.
    Step 4.
    The MCVideo server grants the right to transmit for MCVideo client 1 and by that sends a transmit media granted message to the MCVideo client 1. This message is sent over a unicast bearer (reference point MCVideo‑4).
    Step 5.
    A media transmission notification message is sent from the MCVideo server to all receiving users. This message includes the MCVideo ID of the transmitting MCVideo client as well as the MCVideo group ID. The message is sent over a MBMS bearer to all users that have previously been setup to receive calls over the MBMS bearer. The message is sent over reference point MCVideo‑9.
    Step 6.
    The users of MCVideo clients are informed about the details of video tranmission and the video transmitter.
    Step 7.
    The MCVideo clients may send a receive media request to the MCVideo server, to indicate the reception of media over the MBMS bearer.
    Step 8.
    MCVideo server accepts the media receive request and sends a receive media response message to MCVideo clients over a MBMS bearer by using reference point MCVideo‑9.
    Step 9.
    The media is sent from MCVideo client 1 to the MCVideo server over unicast bearer and from the MCVideo server to the MCVideo client 2 and MCVideo client 3 over MBMS bearer.
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    7.10.4.2.2  Call disconnect over MBMSWord‑p. 155
    Figure 7.10.4.2.2-1 shows the high level procedure where an UnmapGroupFromBearer message is sent by the MCVideo server to the MCVideo clients to indicate that the MCVideo group call is being dissociated from the MBMS bearer.
    (not reproduced yet)
    Figure 7.10.4.2.2-1: Chat group call disconnect on MBMS bearer
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    1. An MCVideo group call is ongoing; the media is broadcasted over MBMS bearer to MCVideo client 2 and MCVideo client 3.
    2. MCVideo server has determined to disconnect the call over the MBMS bearer for the MCVideo clients
    3. An UnmapGroupFromBearer message is sent by the MCVideo server to MCVideo client 2, MCVideo client 3 and possibly to MCVideo client 1 (if in MBMS coverage area) on MBMS bearer(s).
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    7.10.5  Switching from MBMS bearer to unicast bearerWord‑p. 156
    The MCVideo service shall support the procedure for switching from MBMS bearer to unicast bearer as specified TS 23.280 with the following clarifications:
    • The MC service client is the MCVideo client;
    • The MC service server is the MCVideo server; and
    • The MC service ID is the MCVideo ID.
    The MCVideo service shall use the MCVideo‑1, MCVideo‑4, MCVideo 7, MCVideo‑8 and MCVideo 9 reference points for this procedure.
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