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Content for  TS 23.281  Word version:  17.5.0

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7  Procedures and information flows

7.1  Group call

7.1.1  General

Group calls are enabled in both on-network and off-network.

7.1.2  On-network group call

7.1.2.1  General

This subclause contains procedures for group call across a single and multiple MCVideo servers, and associated functions such as emergency call, broadcast call and others.
Two variations of group call model are described in subclause 7.1.2.3, the pre-arranged group call and the chat group call. Each of the subsequent group call types in subclause 7.1.2.4 onwards are applicable to either call model.
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7.1.2.2  Information flows for group call in on-network

7.1.2.2.1  Group call request (MCVideo client - MCVideo server)
Table 7.1.2.2.1-1 describes the information flow group call request from the MCVideo client to the MCVideo server.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the calling party
Functional aliasOThe functional alias of the calling party
MCVideo group IDMThe MCVideo group ID of the group on which the call is requested
SDP offerMMedia parameters of MCVideo clients
Implicit transmit media requestOWhen originating client requests the permission to transmit media, this element shall be included
Broadcast indicatorOIndicates that the group call request is for a broadcast group call
Requested priorityOApplication priority level requested for this call
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7.1.2.2.2  Group call requestWord‑p. 15
Table 7.1.2.2.2-1 describes the information flow group call request from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the calling party
Functional aliasOThe functional alias of the calling party
MCVideo group IDMThe MCVideo group ID of the group on which the call is initiated
SDP offerMMedia parameters of MCVideo server
Broadcast indicatorOIndicates that the group call request is for a broadcast group call
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7.1.2.2.3  Group call response
Table 7.1.2.2.3-1 describes the information flow group call response from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the calling party
MCVideo group IDMThe MCVideo group ID of the group on which the call is requested
SDP answerMMedia parameters selected
ResultMResult of the group call request (success or failure)
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7.1.2.2.4  Group call response (MCVideo client - MCVideo server)Word‑p. 16
Table 7.1.2.2.4-1 describes the information flow group call response from the MCVideo client to the MCVideo server.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the target MCVideo group member
MCVideo group IDMThe MCVideo group ID of the group on which the call is initiated
SDP answerMMedia parameters selected
ResultMResult of the group call request (success or failure)
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7.1.2.2.5  Group call release request
Table 7.1.2.2.5-1 describes the information flow group call release request from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member
MCVideo group IDMThe MCVideo group ID of the group on which the call is released
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7.1.2.2.6  Group call release request (MCVideo client - MCVideo server)
Table 7.1.2.2.6-1 describes the information flow group call release request from the MCVideo client to the MCVideo server.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member
MCVideo group IDMThe MCVideo group ID of the group on which the call is released
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7.1.2.2.7  Group call release response
Table 7.1.2.2.7-1 describes the information flow group call release response from the MCVideo server to the MCVideo server and from the MCVideo client to the MCVideo server.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member
MCVideo group IDMThe MCVideo group ID of the group on which the call is released
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7.1.2.2.8  Group call rejoin requestWord‑p. 17
Table 7.1.2.2.8-1 describes the information flow group call rejoin request from the MCVideo server to the MCVideo server and from the MCVideo client to the MCVideo server.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the re-joining MCVideo group member
Functional aliasOThe functional alias of the re-joining MCVideo group member
MCVideo group IDMThe MCVideo group ID of the group on which the call is on-going
SDP offerMMedia parameters of MCVideo client
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7.1.2.2.9  Group call rejoin response
Table 7.1.2.2.9-1 describes the information flow group call rejoin response from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member rejoining the group call
MCVideo group IDMThe MCVideo group ID of the group on which the call is on-going
SDP answerMMedia parameters selected
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7.1.2.2.10  Group join request
Table 7.1.2.2.10-1 describes the information flow group join request from the MCVideo server to the MCVideo server and from the MCVideo client to the MCVideo server.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member joining the group communications for the group
MCVideo group IDMThe MCVideo group ID of the group to which the group communication is requested
SDP offerMMedia parameters of MCVideo client
Implicit transmit media requestOAn indication that the user is also requesting the permission to transmit video
Requested priorityOApplication priority level requested for this call
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7.1.2.2.11  Group join responseWord‑p. 18
Table 7.1.2.2.11-1 describes the information flow group join response from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member joining the group communications for the group
MCVideo group IDMThe MCVideo group ID of the group to which the group communication is requested
SDP answerMMedia parameters selected
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7.1.2.2.12  Group call leave request
Table 7.1.2.2.12-1 describes the information flow group call leave request from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member which has been de-affiliated
MCVideo group IDMThe MCVideo group ID of the group on which the call is on-going
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7.1.2.2.12a  Group call leave request |R16|
Table 7.1.2.2.12a-1 describes the information flow group call leave request from the MCVideo client to the MCVideo server and from the MCVideo server to the MCVideo server.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member leaving the group call
MCVideo group IDMThe MCVideo group ID of the group on which the call is on-going
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7.1.2.2.13  Group call leave response
Table 7.1.2.2.13-1 describes the information flow group call leave response from the MCVideo client to the MCVideo server and from the MCVideo server to the MCVideo server.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member which has been de-affiliated
MCVideo group IDMThe MCVideo group ID of the group on which the call is on-going
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7.1.2.2.13a  Group call leave response |R16|Word‑p. 19
Table 7.1.2.2.13a-1 describes the information flow group call leave response from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe MCVideo ID of the MCVideo group member leaving the group call
MCVideo group IDMThe MCVideo group ID of the group on which the call is on-going
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7.1.2.2.14Void
7.1.2.2.15Void
7.1.2.2.16Void
7.1.2.2.17Void
7.1.2.2.18  MCVideo emergency group call request
Table 7.1.2.2.18-1 describes the information flow emergency group call request from the MCVideo client to the MCVideo server, from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe identity of the calling party
Functional aliasOThe functional alias of the calling party
MCVideo group IDMThe MCVideo group ID on which the call is to be conducted
Emergency indicatorMIndicates that the group call request is an MCVideo emergency call
Alert indicatorMIndicates whether an emergency alert is to be sent
Requested priorityOPriority level requested for the call
Implicit transmit media request (see NOTE)OIndicates that the originating client requests the permission to transmit media.
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7.1.2.2.19  MCVideo emergency group call responseWord‑p. 20
Table 7.1.2.2.19-1 describes the information flow emergency group call response from the MCVideo client to the MCVideo server, from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe identity of the calling party
MCVideo group IDMThe MCVideo group ID on which the call is to be conducted
ResultMResult of the MCVideo emergency group call request (success or failure)
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7.1.2.2.20  MCVideo in-progress emergency group state cancel request
Table 7.1.2.2.20-1 describes the information flow MCVideo in-progress emergency group state cancel request from the MCVideo client to the MCVideo server and from the MCVideo server to the MCVideo server.
Information Element Status Description
MCVideo IDMThe identity of the cancelling party
MCVideo group IDMThe MCVideo group ID on which the MCVideo in-progress emergency state is to be cancelled.
Alert indicatorOIndicates whether the emergency alert of the cancelling party is to be cancelled
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7.1.2.2.21  MCVideo in-progress emergency group state cancel responseWord‑p. 21
Table 7.1.2.2.21-1 describes the information flow MCVideo in-progress emergency group state cancel response from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe identity of the cancelling party
MCVideo group IDMThe MCVideo group ID on which the MCVideo in-progress emergency state is to be cancelled.
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7.1.2.2.22  MCVideo imminent peril group call request
Table 7.1.2.2.22-1 describes the information flow MCVideo imminent peril group call request from the MCVideo client to the MCVideo server, from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe identity of the calling party
Functional aliasOThe functional alias of the calling party
MCVideo group IDMThe MCVideo group ID on which the call is to be conducted
Requested priorityOPriority level requested for the call
Imminent peril indicatorMIndicates that the group call request is an imminent peril call
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7.1.2.2.23  MCVideo imminent peril group call response
Table 7.1.2.2.23-1 describes the information flow MCVideo imminent peril group call response from the MCVideo client to the MCVideo server, from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe identity of the calling party
MCVideo group IDMThe MCVideo group ID on which the call is to be conducted
ResultMResult of the MCVideo imminent peril group call request (success or failure)
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7.1.2.2.24  MCVideo imminent peril group call cancel request
Table 7.1.2.2.24-1 describes the information flow MCVideo imminent peril group call cancel request from the MCVideo client to the MCVideo server, from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe identity of the cancelling party
MCVideo group IDMThe MCVideo group ID on which the imminent peril is to be cancelled
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7.1.2.2.25  MCVideo imminent peril group call cancel responseWord‑p. 22
Table 7.1.2.2.25-1 describes the information flow MCVideo imminent peril group call cancel response from the MCVideo client to the MCVideo server, from the MCVideo server to the MCVideo server and from the MCVideo server to the MCVideo client.
Information Element Status Description
MCVideo IDMThe identity of the cancelling party
MCVideo group IDMThe MCVideo group ID on which the imminent peril is to be cancelled
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