Content for  TS 23.379  Word version:  19.3.0

When the floor control server receives a floor request from the floor participant, it decides whether to give a grant or not based on, e.g., the session status (i.e., whether the grant is given to another user or not), user profile, priority. The result is informed to the requesting floor participant. When the floor participant receives a floor granted message, it can send voice media over the uplink bearer established beforehand. The floor revoked message can be used as part of override. The floor queue status request can be used to know current position in the queue for floor. Some floor control information flows can also piggyback call control information flows to provide efficient call setup and clearing:

• Call setup request is optionally carried in floor request (uplink) or floor taken (downlink, can be broadcast); and
• Call release request is optionally carried in floor release (uplink) or floor idle (downlink, can be broadcast).

Table 10.9.1.2.2-1 describes the information flow floor request, from the floor participant to the floor control server and from the floor control server to the floor control server, which is used to request the floor for media transfer. This information flow is sent in unicast to the floor control server.

Table 10.9.1.2.3-1 describes the information flow floor granted, from the floor control server to the floor participant and from the floor control server to the floor control server or MC gateway server, which is used to indicate that a request for floor is granted and media transfer is possible. This information flow is sent in unicast (to the granted floor participant).

Table 10.9.1.2.4-1 describes the information flow floor rejected, from the floor control server to the floor participant and from the floor control server to the floor control server or MC gateway server, which is used to indicate that a request for the floor is rejected. This information flow is sent in unicast (to the refused floor participant).

Table 10.9.1.2.5-1 describes the information flow floor request cancel, from the floor participant to the floor control server, which is used to request cancelling the floor request from the floor request queue. This information flow is sent in unicast to the floor control server.

Table 10.9.1.2.6-1 describes the information flow floor request cancel response, from the floor control server to the floor control participant and from the floor control server to the floor control server or MC gateway server, which is used to indicate the response for the floor request cancellation. This information flow is sent in unicast.

Table 10.9.1.2.7-1 describes the information flow floor request cancel notify, from the floor control server to the floor control participant, which is used to indicate the floor request is cancelled by the administrator/floor control server. This information flow is sent in unicast or broadcast.

Table 10.9.1.2.8-1 describes the information flow floor idle, from the floor control server to the floor participant, which is used to indicate that a session is in idle status, i.e. the floor is not granted to any party. This information flows is sent in unicast or broadcast.

Table 10.9.1.2.9-1 describes the information flow floor release, from the floor participant to the floor control server, which is used to indicate the media transfer is completed and floor is released. This information flow is sent in unicast to the floor control server.

Table 10.9.1.2.9a-1 describes the information elements of floor release for multi-talker control, from the floor control server to the floor participants, which is used to indicate the media transfer is completed and floor is released. This information flow is sent in unicast from the floor control server.

Table 10.9.1.2.10-1 describes the information flow floor taken, from the floor control server to the floor participant, which is used to indicate the floor is granted to another MCPTT user. This information flows is sent in unicast or broadcast.

Table 10.9.1.2.10a-1 describes the information elements of floor taken for multi-talker control, from the floor control server to the floor participant, which is used to indicate when the floor is simultaneously granted to multiple MCPTT users. The multi-talker floor taken is sent in unicast or broadcast.

Table 10.9.1.2.11-1 describes the information flow floor revoked, from the floor control server to the floor participant and from the floor control server to the floor control server or MC gateway server, which is used to indicate the floor is revoked from its current holder (the floor participant who was granted the floor). This information flows is sent in unicast (to the revoked floor participant).

Table 10.9.1.2.12-1 describes the information flow floor acknowledgement, from the floor participant to the floor control server, which is used to provide an acknowledgement if the acknowledgement is required in the received floor control message.

Table 10.9.1.2.13-1 describes the information flow queue position request, from the floor participant to the floor control server and from the floor control server to the floor control server or MC gateway server, which is used to request the position in the floor request queue. The MCPTT server and the MCPTT client support queuing of the floor control requests shall support this information flow. This information flow is sent in unicast to the floor control server.

Table 10.9.1.2.14-1 describes the information flow queue position info, from the floor control server to the floor participant and from the floor control server to the floor control server or MC gateway server, which is used to indicate the floor request is queued and the queue position to the floor requesting UE and optionally to the authorized user. The MCPTT server and the MCPTT client support queuing of the floor control requests shall support this information flow. This information flow is sent in unicast (to the queued floor participant and optionally to the authorized user).

Table 10.9.1.2.15-1 describes the information flow unicast media stop request from the floor participant to the floor control server, which is used by the floor participant to indicate that the unicast media flow of the designated communication does not need to be sent to the MCPTT client.

Table 10.9.1.2.16-1 describes the information flow unicast media resume request from the floor participant to the floor control server, which is used by the floor participant to request that the unicast media flow of the designated communication is to be sent to the MCPTT client.

Table 10.9.1.2.17-1 describes the information flow floor revoke request, from an authorized floor participant user to floor control server, which is used to revoke the floor from its current holder (the floor participant who was granted the floor).