Content for TS 23.281 Word version: 19.4.0
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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
7.7.1.3 Transmission control within one MC system for MCVideo service
7.7.1.3.1 Transmission control during an MCVideo session
7.7.1.3.2 Reception control during an MCVideo session
7.7.1.3.2A End media reception - receiving user initiated
7.7.1.3.2B End media reception - transmission control server initiated
7.7.1.3.2C Reception control on overridden - mandatory mode
7.7.1.3.2D Reception control on overridden - negotiated mode
7.7.1.3.3 Transmission revoke during an MCVideo session
7.7.1.3.4 Queue position during an MCVideo session
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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.
| 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).
| 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).
| 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).
| 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.
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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).
| 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).
| 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).
| 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).
| 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).
| 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 |
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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.
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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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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.
| 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. |
7.7.1.3 Transmission control within one MC system for MCVideo service p. 135
7.7.1.3.1 Transmission control during an MCVideo session p. 135
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.
7.7.1.3.2 Reception control during an MCVideo session p. 136
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).
7.7.1.3.2A End media reception - receiving user initiated p. 137
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.
7.7.1.3.2B End media reception - transmission control server initiated p. 138
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.
7.7.1.3.2C Reception control on overridden - mandatory mode p. 139
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.
Step 5.
The transmission control server performs the normal reception control procedure as described in subclause 7.7.1.3.2.
7.7.1.3.2D Reception control on overridden - negotiated mode p. 139
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.
7.7.1.3.3 Transmission revoke during an MCVideo session p. 140
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.
7.7.1.3.4 Queue position during an MCVideo session p. 141
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.
