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Content for  TS 23.281  Word version:  19.0.0

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7.7.1.3.4  Queue position during an MCVideo sessionp. 139
Figure 7.7.1.3.4-1 describes the procedure where the transmission control is conducted for the MCVideo session already established between MCVideo clients (with transmit media granted to transmission control participant B) and server (with an revoke determination at transmission control server). Only two UEs involved in the session are shown for the simplicity.
Reproduction of 3GPP TS 23.281, Fig. 7.7.1.3.4-1: Queue status during an MCVideo session
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Step 1.
It is assumed that transmission control participant B has been granted permission to transmit media and is transmitting video media. There are several other transmission control participants (including transmission control participant A) requesting video transmission which get queued at the transmission control server.
Step 2.
Transmission control participant A would like to know its current position in the video transmission queue.
Step 3.
Transmission control participant A sends a queue position request message to the transmission control server.
Step 4.
Transmission control server determines the current queue position of transmission control participant A from the video transmission queue.
Step 5.
Transmission control server responds with the current position in queue position info message.
Step 6.
User at transmission control participant A is informed about the current queue position.
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7.7.1.3.5  Transmit media request cancellation from the video transmission queuep. 140
7.7.1.3.5.1  Transmit media request cancellation from the queue - MCVideo user initiatedp. 140
Figure 7.7.1.3.5.1-1 illustrates the procedure for transmit media request cancellation from the video transmission queue initiated by the MCVideo user. The MCVideo user may be an authorized user who has rights to cancel the transmit media requests of other MCVideo users, whose transmit media requests are in video transmission queue.
Pre-conditions:
  • It is assumed that transmission control participant B has been granted the permission for video transmission and is transmitting video. There are several other transmission control participants (including transmission control participant A and transmission control participant C) requesting the permission to transmit media which have been queued at the transmission control server.
Reproduction of 3GPP TS 23.281, Fig. 7.7.1.3.5.1-1: Transmit media request cancellation from queue initiated by MCVideo user
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Step 1.
The transmission control participant A wants to remove the transmit media request from the video transmission queue. If transmission control participant A is an authorized MCVideo user with the rights to cancel another MCVideo user's transmit media request, the authorized MCVideo user may request for transmit media request cancellation for one or more transmission control participants, whose transmit media request needs to be removed from the video transmission queue.
Step 2.
The transmission control participant A sends a transmit media cancel request (initiating MCVideo ID) message to the transmission control server. If the transmission control participant A wants to remove the transmit media request(s) of other participant(s), the target participant(s)' MCVideo ID should be included in this message.
Step 3.
The transmission control server shall check whether the requesting transmission control participant has authorization to cancel the transmit media request(s). If authorized, the transmit media request(s) will be removed from the video transmission queue. When the on-going transmissions are completed and are within the limit of the maximum simultaneous transmissions, the transmission control server will process the transmit media request from the updated video transmission queue.
Step 4.
If the transmit media cancel request in step 3 is sent by an authorized user (e.g., dispatcher) to cancel the transmit media request(s) of other participant(s) from the video transmission queue, the transmit media cancel request notify message is sent to the transmission control participant whose transmit media request was cancelled from the video transmission queue.
Step 5.
The transmission control server provides a transmit media cancel response to the transmission control participant A when the transmit media request cancellation is completed. Optionally, the new queue position information may be notified to the transmission control participants whose transmit media requests are in the video transmission queue (not shown in the figure).
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7.7.1.3.5.2  Transmit media request cancellation from the queue - transmission control server initiatedp. 141
Figure 7.7.1.3.5.2-1 illustrates the procedure for transmit media request cancellation from the queue initiated by the transmission control server. Only two UEs involved in the session are shown for the simplicity.
Pre-conditions:
  • It is assumed that transmission control participant B has been granted the permission to transmit media and is transmitting video. There are several other transmission control participants (including transmission control participant A and participant C) requesting the permission to transmit media which have been queued at the transmission control server.
Reproduction of 3GPP TS 23.281, Fig. 7.7.1.3.5.2-1: Transmit media request cancellation from queue initiated by transmission control server
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Step 1.
The transmission control server removes the transmit media request from the video transmission queue based on policy. e.g., expiration of a timer. In the case when transmission control server receives repeated transmit media requests from a transmission control participant while the limit for maximum simultaneous media transmissions has reached, the new transmit media request is accepted and added into the video transmission queue and the existing/former transmit media request is removed from the video transmission queue or the new transmit media request is rejected and the existing/former transmit media request of this transmission control participant is retained in the video transmission queue.
Step 2.
The transmission control server sends a transmit media cancel request notify to the transmission control participant(s) whose transmit media request is removed from the video transmission queue.
Step 3.
Optionally, the new queue position information is notified to the other transmission control participants whose transmit media requests are queued.
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