Content for TS 23.281 Word version: 19.1.0

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7.7 Transmission control 7.7.1 Transmission control for on-network MCVideo service 7.7.1.1 General 7.7.1.2 Information flows for transmission control for on-network 7.7.1.2.1 General 7.7.1.2.2 Transmit media request 7.7.1.2.3 Transmit media granted 7.7.1.2.4 Transmit media rejected 7.7.1.2.5 Media transmission notification 7.7.1.2.6 Receive media request 7.7.1.2.7 Receive media response 7.7.1.2.8 Media reception notification 7.7.1.2.9 Queue position info 7.7.1.2.10 Transmission revoked 7.7.1.2.11 Queue position request 7.7.1.2.12 Transmit media cancel request 7.7.1.2.13 Transmit media cancel response 7.7.1.2.14 Transmit media cancel request notify 7.7.1.2.15 Transmit media end request 7.7.1.2.16 Transmit media end response 7.7.1.2.17 Remote transmit media request 7.7.1.2.18 Remote transmit media response 7.7.1.2.19 Remote transmit media end request 7.7.1.2.20 Remote transmit media cancel response 7.7.1.2.21 Media reception end request 7.7.1.2.22 Media reception end response 7.7.1.2.23 Media reception override notification 7.7.1.2.24 Transmit media end notify 7.7.1.2.25 Transmission idle
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7.7 Transmission control p. 128

7.7.1 Transmission control for on-network MCVideo service p. 128

7.7.1.1 General p. 128

The procedure is for providing a transmission control to MCVideo UE in an on-network case and applies for both private call and group call. Transmission control is performed by using transmission control information flows between the transmission control participant and the transmission control server.

7.7.1.2 Information flows for transmission control for on-network p. 128

7.7.1.2.1 General p. 128

When the transmission control server receives a transmit media request from the transmission control participant, it decides whether to give a grant or not. The result is informed to the requesting transmission control participant. When the transmission control participant receives a transmit media granted message, it can send video media over the uplink bearer established beforehand. The transmit media revoked message can be used as part of revoke. The transmit media queue status request can be used to know current position in the queue for media transmission.

Some transmission control information flows can also piggyback call control information flows to provide efficient call setup and clearing:

Call setup request is optionally carried in transmit media request (uplink); and
Call release request is optionally carried in media transmission release (uplink).

7.7.1.2.2 Transmit media request p. 128

Table 7.7.1.2.2-1 describes the information flow transmit media request, from the transmission control participant to the transmission control server, which is used to request the transmit media request. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.2-1: Transmit media request

Information Element	Status	Description
MCVideo ID	M	Identity of the user whose media transmission is requested
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing
Media priority	O	Priority of the media

7.7.1.2.3 Transmit media granted p. 129

Table 7.7.1.2.3-1 describes the information flow transmit media granted, from the transmission control server to the transmission control participant, which is used to indicate that a transmit media request is granted and media transmission is possible. This information flow is sent in unicast (to the granted transmission control participant).

Table 7.7.1.2.3-1: Transmit media granted

Information Element	Status	Description
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing
Acknowledgement required	O	Indicates if acknowledgement from the transmission control participant is required

7.7.1.2.4 Transmit media rejected p. 129

Table 7.7.1.2.4-1 describes the information flow transmit media rejected, from the transmission control server to the transmission control participant, which is used to indicate that a transmit media request is rejected. This information flow is sent in unicast (to the refused transmission control participant).

Table 7.7.1.2.4-1: Transmit media rejected

Information Element	Status	Description
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing
Rejection cause	O	Indicates the cause for transmit media rejection
Acknowledgement required	O	Indicates if acknowledgement from the transmission control participant is required

7.7.1.2.5 Media transmission notification p. 129

Table 7.7.1.2.5-1 describes the information flow media transmission notification, from the transmission control server to the transmission control participant, which is used to indicate that a media transmission is available from another user. This information flow is sent in unicast (to the receiving transmission control participant).

Table 7.7.1.2.5-1: Media transmission notification

Information Element	Status	Description
MCVideo ID	M	Identity of the user who is transmitting the media
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing
Media reception mode (see NOTE)	M	Indicates the media reception mode (manual or forced).
NOTE: In the case of manual reception mode, to receive media, an explicit request from the user is required, whereas an explicit request is not required for the forced reception mode.

7.7.1.2.6 Receive media request p. 129

Table 7.7.1.2.6-1 describes the information flow receive media request, from the transmission control participant to the transmission control server, which is used to request the reception of the media from another user. This information flow is sent in unicast (to the transmission control server).

Table 7.7.1.2.6-1: Receive media request

Information Element	Status	Description
MCVideo ID	M	Identity of the user who is requesting the reception of the media
Source MCVideo ID	M	Identify of the user who is transmitting the media
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.7 Receive media response p. 130

Table 7.7.1.2.7-1 describes the information flow receive media response, from the transmission control server to the transmission control participant, which is used to indicate whether the media reception is possible or not. This information flow is sent in unicast (to the receiving transmission control participant).

Table 7.7.1.2.7-1: Receive media response

Information Element	Status	Description
Result	M	Indicates whether media reception is possible as per the request
Rejection cause	O	Indicates the cause for rejecting the media receive request
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.8 Media reception notification p. 130

Table 7.7.1.2.8-1 describes the information flow media reception notification, from the transmission control server to the transmission control participant, which is used to indicate that a media reception has been initiated to a user. This information flow is sent in unicast (to the transmitting transmission control participant).

Table 7.7.1.2.8-1: Media reception notification

Information Element	Status	Description
MCVideo ID	M	Identity of the user who is receiving the media
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.9 Queue position info p. 130

Table 7.7.1.2.9-1 describes the information flow queue position info, from the transmission control server to the transmission control participant, which is used to indicate that the transmit media request is queued and the queue position to the transmit media requesting UE. The MCVideo server and the MCVideo client support queuing of the transmit media requests shall support this information flow. This information flow is sent in unicast (to the queued transmission control participant).

Table 7.7.1.2.9-1: Queue position info

Information Element	Status	Description
Queue position info	M	Position of the queued transmit media request in the queue
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing
Acknowledgement required	O	Indicates if acknowledgement from the transmission control participant is required

7.7.1.2.10 Transmission revoked p. 131

Table 7.7.1.2.10-1 describes the information flow transmission revoked, from the transmission control server to the transmission control participant, which is used to indicate that the on-going video transmission is queued and the queue position is provided or the on-going video transmission is terminated. This information flow is sent in unicast (to the queued transmission control participant).

Table 7.7.1.2.10-1: Transmission revoked

Information Element	Status	Description
Revoke reason	M	The reason for revoke like queue or termination of on-going video transmission
Queue position info	O (1)	Position of the queued transmit media request in the queue
Media identifier	O (2)	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing
Acknowledgement required	O	Indicates if acknowledgement from the transmission control participant is required
NOTE 1: If revoke reason is queuing, then queue position info is included. NOTE 2: If revoke reason is termination, then media identifier is included.

7.7.1.2.11 Queue position request p. 131

Table 7.7.1.2.11-1 describes the information flow queue position request, from the transmission control participant to the transmission control server, which is used to request the position in the video transmission queue. The MCVideo server and the MCVideo client support queuing of the transmission control requests shall support this information flow. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.11-1: Queue position request

Information Element	Status	Description
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.12 Transmit media cancel request p. 131

Table 7.7.1.2.12-1 describes the information flow transmit media cancel request, from the transmission control participant to the transmission control server. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.12-1: Transmit media cancel request

Information Element	Status	Description
MCVideo ID	M	Identity of the user whose media transmission is requested for cancellation
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.13 Transmit media cancel response p. 131

Table 7.7.1.2.13-1 describes the information flow transmit media cancel response, from the transmission control server to the transmission control participant. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.13-1: Transmit media cancel response

Information Element	Status	Description
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.14 Transmit media cancel request notify p. 132

Table 7.7.1.2.14-1 describes the information flow transmit media cancel request notify, from the transmission control server to the transmission control participant. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.14-1: Transmit media cancel request notify

Information Element	Status	Description
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.15 Transmit media end request p. 132

Table 7.7.1.2.15-1 describes the information flow transmit media end request, from the transmission control participant to the transmission control server and from the transmission control server to the transmission control participant. This information flow is sent in unicast to the transmission control server/transmission control participant.

Table 7.7.1.2.15-1: Transmit media end request

Information Element	Status	Description
MCVideo ID	M	Identity of the user whose media transmission is requested to be terminated.
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.16 Transmit media end response p. 132

Table 7.7.1.2.16-1 describes the information flow transmit media end response, from the transmission control participant and the transmission control server and from the transmission control server to the transmission control participant. This information flow is sent in unicast to the transmission control server/transmission control participant.

Table 7.7.1.2.16-1: Transmit media end response

Information Element	Status	Description
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.17 Remote transmit media request p. 132

Table 7.7.1.2.17-1 describes the information flow remote transmit media request, from the transmission control participant to the transmission control server. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.17-1: Remote transmit media request

Information Element	Status	Description
MCVideo ID	M	Identity of the user who remotely initiated the media transmission of another user.
MCVideo ID	M	Identity of the user whose media transmission is requested
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing
Media priority	O	Priority of the media

7.7.1.2.18 Remote transmit media response p. 133

Table 7.7.1.2.18-1 describes the information flow remote transmit media response, from the transmission control server to the transmission control participant. This information flow is sent in unicast to the transmission control participant.

Table 7.7.1.2.18-1: Remote transmit media response

Information Element	Status	Description
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.19 Remote transmit media end request p. 133

Table 7.7.1.2.19-1 describes the information flow remote transmit media end request, from the transmission control participant to the transmission control server. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.19-1: Remote transmit media end request

Information Element	Status	Description
MCVideo ID	M	Identity of the user whose media transmission is requested for cancellation
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.20 Remote transmit media cancel response p. 133

Table 7.7.1.2.20-1 describes the information flow transmit media end response, from the transmission control server to the transmission control participant. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.20-1: Remote transmit media end response

Information Element	Status	Description
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.21 Media reception end request p. 133

Table 7.7.1.2.21-1 describes the information flow media reception end request, from the transmission control server to the transmission control participant and from the transmission control participant to the transmission control server.

Table 7.7.1.2.21-1: Media reception end request

Information Element	Status	Description
MCVideo ID	M	Identity of the user whose media receipt is requested for cancellation
Media identifier	M	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.22 Media reception end response p. 134

Table 7.7.1.2.22-1 describes the information flow media reception end response, from the transmission control server to the transmission control participant and from the transmission control participant to the transmission control server.

Table 7.7.1.2.22-1: Media reception end response

Information Element	Status	Description
Media identifier	M	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.23 Media reception override notification p. 134

Table 7.7.1.2.23-1 describes the information flow media reception override notification, from the transmission control server to the transmission control participant.

Table 7.7.1.2.23-1: Media reception override notification

Information Element	Status	Description
MCVideo ID	M	Identity of the user who is requesting the reception of the media
MCVideo ID	O	Identify of the user of the overriding media
Media identifier	M	Identifies the communication of overriding media, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing
MCVideo ID	O	Identify of the user of the overridden media
Media identifier	M	Identifies the communication of overridden media, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.24 Transmit media end notify p. 134

Table 7.7.1.2.24-1 describes the information flow transmit media end notify, from the transmission control server to the transmission control participant. This information flow is sent in unicast to the transmission control server.

Table 7.7.1.2.24-1: Transmit media end notify

Information Element	Status	Description
MCVideo ID	M	Identity of the user whose media transmission has been released
Media identifier	O	Identifies the communication, e.g. by identifying the media flow within a media multiplex, present only if media multiplexing

7.7.1.2.25 Transmission idle |R18| p. 134

Table 7.7.1.2.25-1 describes the information flow transmission idle from the transmission control server to the transmission control participant(s) during silent period (i.e., when no video transmission is ongoing). This information flow is sent over unicast or broadcast.

Table 7.7.1.2.25-1: Transmission idle

Information Element	Status	Description
Media identifier	O	Identity of the communication, e.g., by identifying the media flow within a media multiplex, present only if media multiplexing.
Acknowledgement required	O	Indicates if acknowledgment from the transmission control participant(s) is required.