Figure 7.7.1.3.1-1 describes the procedure for transmission control between the transmission control participant and the transmission control server during an MCVideo session. Only two UEs involved in the session are shown for the simplicity.
Pre-condition:
-
MCVideo session is established between MCVideo clients (client A and client B) and MCVideo server
-
Transmission control is established between transmission control participants and transmission control server and there is no ongoing media transmission.
Step 1.
Transmission control participant A wants to send video media over the session.
Step 2.
Transmission control participant A sends a transmit media request message to transmission control server which includes transmission priority and other information as necessary.
Step 3.
Transmission control server makes the determination on what action (grant, deny, or queue) to take on the request based on transmission control criteria (e.g., group policy) and determines to accept the transmit media request from transmission control participant A.
Step 4.
Transmission control server responds with a transmit media granted message (4a) to transmission control participant A. Transmission control server may send transmit media rejected message (4b) indicating the cause of rejection or queue position info message (4c) indicating that the transmit media request has been queued.
Step 5.
The transmit media granted shall cause the user of UE A where the transmission control participant A is located to be notified.
Step 6.
Transmission control participant A starts sending video media over the session established to the transmission control server.
Figure 7.7.1.3.2-1 describes the procedure for the reception control between the transmission control participant and the transmission control server during an MCVideo session. Only two UEs involved in the session are shown for the simplicity.
Pre-condition:
-
MCVideo session is established between MCVideo clients (client A and client B) and MCVideo server
-
Transmission control is established between transmission control participants and transmission control server.
-
Transmission control participant A has been granted the permission to transmit media.
Step 1.
The transmission control server determines the reception mode for downlink transmission control participants for the media transmission permitted to transmission control participant A. The manual and forced reception modes are determined based on configurations (e.g. auto-receive video transmissions, auto-receive emergency video transmissions) as described in
Annex A.
Step 2.
Transmission control server sends a media transmission notification message to the transmission control participant B including information about the video transmitter and the reception mode.
Step 3.
The receipt of the media transmission notification is used to inform the user of UE B the details of video transmission and the video transmitter.
Step 4.
Based on the notification received, the user of UE B may want take actions (receive, reject or cancel) regarding the media available for reception.
Step 5.
If user of UE B wants to receive the media or it required to receive the media via forced reception, it causes the transmission control participant B to send a media receive request message to the transmission control server.
Step 6.
Transmission control server makes the determination on what action (e.g., real-time stream downlink, make stream downloadable, reject) to take on the request based on reception control criteria (e.g., allowed simultaneous reception) and determines to accept the media receive request from transmission control participant B. Transmission control server will also determine the availability of the media at the server to initiate the downlink reception.
Step 7.
Transmission control server sends a receive media response message to transmission control participant B.
Step 8.
Transmission control server sends video media to transmission control participant B.
Step 9.
Optionally, the transmission control server sends media reception notification message to transmission control participant A which includes the information about the video recipient (transmission control participant B).
Figure 7.7.1.3.2A-1 describes the procedure for the receiving user initiated media reception end. Only two UEs involved in the session are shown for the simplicity.
Pre-condition:
-
MCVideo session is established between MCVideo clients (client A and client B) and MCVideo server
-
Transmission control is established between transmission control participants and transmission control server.
-
Transmission control participant A has been granted the permission to transmit media.
Step 1.
The MCVideo user determines to end a receiving video stream.
Step 2.
The user sends an media reception end request including the video stream to be ended to the transmission control server.
Step 3.
The transmission control server returns a media reception end response.
Step 4.
Upon receiving the media reception end request, the transmission control server stops sending the video stream selected to the transmission control participant B.
Step 5.
If the end media reception at transmission control participant B causes the video transmission continuation condition to fail, then the transmission control server initiates the media transmission end procedure as described in
subclause 7.7.1.3.6.2.
Figure 7.7.1.3.2B-1 describes the procedure for the transmission control server initiated media reception end. Only two UEs involved in the session are shown for the simplicity.
Pre-condition:
-
MCVideo session is established between MCVideo clients (client A and client B) and MCVideo server
-
Transmission control is established between transmission control participants and transmission control server.
-
Transmission control participant A has been granted the permission to transmit media.
Step 1.
The transmission control server determines to end a video stream transmitting to transmission control participant B according to events or configurations.
Step 2.
The transmission control server sends an media reception end request including the video stream to be ended to the transmission control participant B.
Step 3.
The MCVideo user is notified about the media reception end.
Step 4.
The transmission control participants B returns a media reception end response.
Step 5.
The transmission control server stops sending the video stream selected to the transmission control participant B.
Step 6.
If the end media reception at transmission control participants B causes the continuation conditions to fail, then the transmission control server initiates media transmission end procedure as described in
subclause 7.7.1.3.6.2.
Figure 7.7.1.3.2C-1 describes the procedure for the reception control on overridden with mandatory mode that the transmission control server determines the video stream to be overridden. Only two UEs involved in the session are shown for the simplicity.
Pre-condition:
-
MCVideo session is established between MCVideo clients (client A and client B) and MCVideo server.
-
Transmission control is established between transmission control participants and transmission control server.
-
Transmission control participant A has been granted the permission to transmit media.
Step 1.
A new media stream is to be delivered to the transmission control participant B while the maximum number of simultaneous streams is reached. The transmission control server determines to override another media stream being received by the transmission control participant B accord to the media stream characteristics.
Step 2.
Transmission control server sends a media reception override notification message to the transmission control participant B including information about the video stream being overridden and stop the downlink delivery of the overridden video stream to the transmission control participant B. The overriding video stream information maybe also included.
Step 3.
The user of UE B is notified about the details of overriding/overridden.
Step 4.
The transmission control server initiates the media reception end procedure as described in
subclause 7.7.1.3.2B. 5. The transmission control server performs the normal reception control procedure as described in
subclause 7.7.1.3.2.
Figure 7.7.1.3.2D-1 describes the procedure for the reception control on overridden with negotiated mode that the transmission control participant determines the video stream to be overridden. Only two UEs involved in the session are shown for the simplicity.
Pre-condition:
-
MCVideo session is established between MCVideo clients (client A and client B) and MCVideo server
-
Transmission control is established between transmission control participants and transmission control server.
-
Transmission control participant A has been granted the permission to transmit media.
Step 1.
A new media stream is to be delivered to the transmission control participant B while the maximum number of simultaneous streams is received. The transmission control server determines to override another media stream being received by the transmission control participant B according to the media stream characteristics.
Step 2.
Transmission control server sends a media transmission notification message to the transmission control participant B including information about the new video stream.
Step 3.
The user of transmission control participant B is notified about the maximum number of simultaneous streams received. The MCVideo user determines to reject the video stream or accept the video streaming by overriding a receiving video stream.
Step 4.
The transmission control participant initiates the media reception end procedure as described in
subclause 7.7.1.3.2A.
Step 5.
Then the transmission control participant B requests to receive the new video stream as the normal reception control procedure described in
subclause 7.7.1.3.2.
Figure 7.7.1.3.3-1 describes the procedure for transmission revoke during an MCVideo session. Only two UEs involved in the session are shown for the simplicity.
Pre-condition:
-
MCVideo session is established between MCVideo clients (client A and client B) and MCVideo server
-
Transmission control is established between transmission control participants and transmission control server.
-
Transmission control participant B has been granted the permission to transmit media and there may be ongoing media transmission from transmission control participant B.
-
The maximum media transmission limit for the MCVideo session is reached.
Step 1.
Transmission control participant A wants to send video media over the session.
Step 2.
Transmission control participant A sends a transmit media request message to transmission control server which includes transmission priority and other information as necessary.
Step 3.
Transmission control server determines to accept the transmit media request from transmission control participant A and decides to pre-empt the on-going video transmission from transmission control participant B by queuing or ending the on-going video transmission.
Step 4.
Transmission control server responds with a transmission revoked message (4a) to transmission control participant B with the action of pre-emption whether queued or terminated. Transmission control server responds with a transmit media granted message (4b) to transmission control participant A.
Step 5.
The transmission revoked shall cause the transmission control participant B to be notified of the revoke (5a) of the on-going video transmission by queuing or termination. The transmit media granted shall cause the user of UE A where the transmission control participant A is located to be notified.
Step 6.
Transmission control participant A starts sending video media over the session established to the transmission control server.
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.
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.
Figure 7.7.1.3.7-1 describes the procedure for remotely initiated media transmission during an MCVideo session by an authorized user. Only two UEs involved in the session are shown for the simplicity.
Pre-condition:
-
MCVideo session is established between MCVideo clients (client A and client B) and MCVideo server
-
Transmission control is established between transmission control participants and transmission control server and there is no ongoing media transmission.
-
The user of the UE at the transmission control participant A is authorized to remotely initiate a media transmission from transmission control participant B
Step 1.
Transmission control participant A sends a remote transmit media request message to transmission control server including the MCVideo ID of the user at the UE of the transmission control participant B and the MCVideo ID of the user at the UE of the transmission control participant A.
Step 2.
Transmission control server checks whether the user at the UE of transmission control participant A is authorized to remotely initiate a media transmission from transmission control participant B. If authorized, the transmission control server makes the determination on what action (grant, deny, or queue) to take on the request based on transmission control criteria (e.g., group policy) and determines to accept the remotely initiated transmit media request from transmission control participant A.
Step 3.
Transmission control server sends a transmit media granted message to transmission control participant B.
Step 4.
Transmission control server provides a remote transmit media response message to transmission control participant A indicating success (media transmission occurs from transmission control participant B) or a failure reason.
Step 5.
Transmission control participant B starts sending video media over the session established to the transmission control server.