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Content for  TS 23.281  Word version:  19.0.0

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7.7.2.7  Transmission overridep. 153

This subclause is applicable in the single arbitrator in the approach.
Figure 7.7.2.7-1 describes procedures for transmission participants when an MCVideo client authorized to override, requests for transmission permission.
The MCVideo client has detected presence of a transmission arbitrator e.g., by receiving responses to transmission arbitration control message. The MCVideo client sends a transmission request and waits for a response.
Pre-conditions:
  1. An off-network group communication has been established.
  2. Maximum simultaneous transmissions limit has been reached.
Reproduction of 3GPP TS 23.281, Fig. 7.7.2.7-1: Transmission override
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Step 1.
MCVideo client 2 sends a transmission request message to the MCVideo group.
Step 2.
As the configured limit of maximum simultaneous transmissions is already reached, MCVideo client 1, being the transmission arbitrator, checks the override policy.
Step 3.
If MCVideo client 2 is authorized to override (based on e.g., transmission priority), MCVideo client 1 sends a transmission revoked message to the MCVideo group. Transmission revoked message indicates the MCVideo client from which the permission is revoked, as the intended recipient.
Step 4.
MCVideo client 3 stops transmission of video and MCVideo user at MCVideo client 3 may be notified that the transmission permission has been revoked.
Step 5.
MCVideo client 1 sends a transmission granted message to the MCVideo group. Transmission granted message indicates MCVideo client 2 as the intended recipient.
Step 6.
MCVideo user at MCVideo client 2 may be notified that the video can now be transmitted.
Step 7.
MCVideo client 2 transmits video to the MCVideo group.
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7.7.2.8  Transmission override (revoke self)p. 154

This subclause is applicable in the single arbitrator approach.
Figure 7.7.2.8-1 describes procedures for transmission participants when an MCVideo client authorized to override, requests for transmission permission.
The MCVideo client has detected presence of a transmission arbitrator e.g., by receiving responses to transmission arbitration control message. The MCVideo client sends a transmission request and waits for a response.
Pre-conditions:
  1. An off-network group communication has been established.
  2. Maximum simultaneous transmissions limit has been reached.
Reproduction of 3GPP TS 23.281, Fig. 7.7.2.8-1: Transmission override
Up
Step 1.
MCVideo client 2 sends a transmission request message to the MCVideo group.
Step 2.
As the configured limit of maximum simultaneous transmissions is already reached, MCVideo client 1, being a transmission arbitrator, checks the override policy.
Step 3.
If MCVideo client 2 is authorized to override (based on e.g., transmission priority), MCVideo client 1 may send a transmission revoked message to the MCVideo group. Transmission revoked message indicates the MCVideo client 1, the current arbitrator, whose permission is revoked.
Step 4.
MCVideo client 1 stops transmission of video and MCVideo user at MCVideo client 1 may be notified that the transmission permission has been revoked.
Step 5.
MCVideo client 1 sends a transmission granted message to the MCVideo group. The transmission granted message indicates MCVideo client 2 as the intended recipient and MCVideo client 2 as the subsequent transmission arbitrator.
Step 6a.
MCVideo client 2 sends a transmission arbitration taken message to the MCVideo group.
Step 6b.
MCVideo user at MCVideo client 2 may be notified that the video can now be transmitted.
Step 7.
MCVideo client 1, upon receiving the transmission arbitration taken message releases transmission arbitration.
Step 8.
MCVideo client 2 transmits video to the MCVideo group.
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