Content for TS 23.281 Word version: 19.3.0

1… 5… 6… 7… 7.1.2.3… 7.1.2.3.1.2… 7.1.2.3.2… 7.1.2.4… 7.1.2.5.2… 7.1.3… 7.2… 7.2.2.3… 7.2.2.4… 7.2.3… 7.3… 7.4… 7.4.3… 7.5… 7.5.2.3… 7.6… 7.7… 7.7.1.3… 7.7.1.3.2A… 7.7.1.3.4… 7.7.1.3.6… 7.7.2… 7.7.2.7… 7.7.2.9… 7.8… 7.11… 7.17… 7.19… 7.19.2.8… 7.19.3… 7.19.3.1.4… 7.19.3.2… 7.19.3.2.3… 7.19.3.2.6… A…

7.19 Ad hoc group call 7.19.1 General 7.19.2 Information flows 7.19.2.1 Ad hoc group call request (MCVideo client - MCVideo server) 7.19.2.2 Ad hoc group call request return (MCVideo server - MCVideo client) 7.19.2.3 Ad hoc group call request (MCVideo server - MCVideo server) 7.19.2.4 Ad hoc group call request (MCVideo server - MCVideo client) 7.19.2.5 Ad hoc group call response (MCVideo server - MCVideo client) 7.19.2.6 Ad hoc group call response (MCVideo server - MCVideo server) 7.19.2.7 Ad hoc group call response (MCVideo client - MCVideo server)
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7.19 Ad hoc group call |R18| p. 175

7.19.1 General p. 175

This subclause contains procedures for ad hoc group call across one or more MCVideo systems, and associated functions such as emergency call, Imminent peril call, broadcast call and others.

The ad hoc group calls can use the participants list provided by either an initiator of the call or MCVideo server. The MCVideo server can use the criteria provided by the initiator of the call to determine the participants list along with its own criteria or local policies. The resulting ad hoc group uses the configuration of a separate preconfigured MCVideo group.

The preconfigured MCVideo group that provides the configuration is not used for the MCVideo group communication, it only provides configuration for one or more adhoc group calls. The MCVideo group ID of the ad hoc group call is provided by the MCVideo server when the ad hoc group call is originated. In order to establish security context for the end-to-end secured ad hoc group call, the security related information is used from this preconfigured group.

7.19.2 Information flows p. 175

7.19.2.1 Ad hoc group call request (MCVideo client - MCVideo server) p. 175

Table 7.19.2.1-1 describes the information flow ad hoc group call request from the MCVideo client to the MCVideo server.

Table 7.19.2.1-1: Ad hoc group call request information elements

Information element	Status	Description
MCVideo ID	M	The MCVideo ID of the calling party
Functional alias	O	The functional alias of the calling party
MCVideo ad hoc group ID (see NOTE 1)	O	The MCVideo group ID to be associated with the ad hoc group communication.
Encryption supported (see NOTE 2)	O	Indicates whether this ad hoc group call supports end-to-end encryption.
MCVideo ID list (see NOTE 3, NOTE 6)	O	MCVideo IDs of the participants being invited for the ad hoc group call
SDP offer	M	Media parameters of MCVideo clients
Implicit transmit media request (see NOTE 4)	O	When originating client requests the transmission of media, this element shall be included
Broadcast indicator (see NOTE 5)	O	Indicates that the group call request is for a broadcast group call
Imminent peril indicator (see NOTE 5)	O	Indicates that the ad hoc group call request is an MCVideo imminent peril call
Emergency Indicator (see NOTE 5)	O	Indicates that the ad hoc group call request is an MCVideo emergency call
MCVideo ID list (see NOTE 3)	O	List of participants required to acknowledge the ad hoc group call before start of the audio transmission
Location information	O	Location of the calling party.
Criteria for determining the participants (see NOTE 6, NOTE 7)	O	Carries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCVideo server for determining the participants e.g., it can be a location based criteria to invite particpants in a particular area
Requested priority	O	Application priority level requested for this group call
NOTE 1: If this information element is not included, the MCVideo server assigns an MCVideo ad hoc group ID to be used for the ad hoc group communication. This information element is returned to the calling party to use in the ad hoc group communication. If the request follows an ad hoc group for emergency alert, then this element must be present. NOTE 2: This information element is present and set to true only if this ad hoc group call is encrypted. When the ad hoc group call is initiated with participants provided by the initiator this acts as an indicator that subsequent requests follow targeting the individual participants and carrying the relevant key material. If this information element is set to false or not present, then this ad hoc group call is unencrypted. NOTE 3: This element is included only when the originating client sends the list of participants. NOTE 4: This element is included only when the originating client requests the transmission of media. NOTE 5: If used, only one of these information elements is present. NOTE 6: Only one of these information elements is present. NOTE 7: If the request follows an ad hoc group for emergency alert, then this element is not present.

7.19.2.2 Ad hoc group call request return (MCVideo server - MCVideo client) p. 177

Table 7.19.2.2-1 describes the information flow ad hoc group call request return from the MCVideo server to the MCVideo client. This response could be intermediate response to provide the server assigned MCVideo ad hoc group ID.

Table 7.19.2.2-1: Ad hoc group call request return information elements

Information element	Status	Description
MCVideo ID	M	The MCVideo ID of the calling party
MCVideo ad hoc group ID (NOTE)	O	The MCVideo group ID to be associated with the ad hoc group call which is either provided by the group call initiator or assigned by the MCVideo server. This information element shall be present if the authorization result is success.
Pre-configured group ID (NOTE)	O	The preconfigured MCVideo group ID whose group configuration is to be used for the ad hoc group call (e.g. information for end-to-end security).
Authorization result	M	Indicate if authorization is success or failure
NOTE: These IEs are included only when the Authorization Result IE indicates authorization is successful.

7.19.2.3 Ad hoc group call request (MCVideo server - MCVideo server) p. 177

Table 7.19.2.3-1 describes the information flow ad hoc group call request between the MCVideo servers.

Table 7.19.2.3-1: Ad hoc group call request information elements

Information element	Status	Description
MCVideo ID	M	The MCVideo ID of the calling party
Functional alias	O	The functional alias of the calling party
MCVideo ad hoc group ID	M	The MCVideo group ID to be associated with the ad hoc group call
MCVideo ID list (see NOTE 1, NOTE 3)	O	MCVideo IDs of the participants being invited for the ad hoc group call
SDP offer	M	Media parameters of MCVideo server
Broadcast indicator (see NOTE 2)	O	Indicates that the ad hoc group call request is for a broadcast ad hoc group call
Imminent peril indicator (see NOTE 2)	O	Indicates that the ad hoc group call request is an MCVideo imminent peril call
Emergency Indicator (see NOTE 2)	O	Indicates that the ad hoc group call request is an MCVideo emergency call
Preconfigured ad hoc group identity	O	Group identity whose configuration is to be applied for this ad hoc group call.
Criteria for determining the participants (see NOTE 3)	O	Carries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCVideo server for determining the participants e.g., it can be a location based criteria to invite particpants in a particular area
Requested priority	O	Application priority level requested for this group call
NOTE 1: This element is included only when the originating client sends the list of participants. NOTE 2: If used, only one of these information elements is present. NOTE 3: Only one of these information elements is present.

7.19.2.4 Ad hoc group call request (MCVideo server - MCVideo client) p. 178

Table 7.19.2.4-1 describes the information flow ad hoc group call request from the MCVideo server to the MCVideo client.

Table 7.19.2.4-1: Ad hoc group call request information elements

Information element	Status	Description
MCVideo ID	M	The MCVideo ID of the calling party
MCVideo ID	M	The identity of the MCVideo user towards which the request is sent
Functional alias	O	The functional alias of the calling party
MCVideo ad hoc group ID	M	The MCVideo group ID to be associated with the ad hoc group call
SDP offer	M	Media parameters of MCVideo server
Broadcast indicator (NOTE)	O	Indicates that the ad hoc group call request is for a broadcast ad hoc group call
Imminent peril indicator (NOTE)	O	Indicates that the ad hoc group call request is an MCVideo imminent peril call
Emergency Indicator (NOTE)	O	Indicates that the ad hoc group call request is an MCVideo emergency call
Preconfigured ad hoc group identity	O	Group identity whose configuration is to be applied for this ad hoc group call.
NOTE: If used, only one of these information elements is present.

7.19.2.5 Ad hoc group call response (MCVideo server - MCVideo client) p. 179

Table 7.19.2.5-1 describes the information flow ad hoc group call response from the MCVideo server to the MCVideo client.

Table 7.19.2.5-1: Ad hoc group call response information elements

Information element	Status	Description
MCVideo ID	M	The MCVideo ID of the calling party
Functional alias	O	The functional alias of the calling party
MCVideo group ID	M	The MCVideo group ID to be associated with the ad hoc group call
SDP answer	O	Media parameters selected and present if the Result is success.
Result	M	Result of the group call request (success or failure)

7.19.2.6 Ad hoc group call response (MCVideo server - MCVideo server) p. 179

Table 7.19.2.6-1 describes the information flow ad hoc group call response between the MCVideo servers.

Table 7.19.2.6-1: Ad hoc group call response information elements

Information element	Status	Description
MCVideo ID	M	The MCVideo ID of the target MCVideo user
Functional alias	O	The functional alias of the target MCVideo user
MCVideo ad hoc group ID	M	The MCVideo group ID to be associated with the ad hoc group call
SDP answer	O	Media parameters selected and present if the Result is success.
Result	M	Result of the ad hoc group call request (success or failure)

7.19.2.7 Ad hoc group call response (MCVideo client - MCVideo server) p. 180

Table 7.19.2.7-1 describes the information flow ad hoc group call response from the MCVideo client to the MCVideo server.

Table 7.19.2.7-1: Ad hoc group call response information elements

Information element	Status	Description
MCVideo ID	M	The MCVideo ID of the target MCVideo user
Functional alias	O	The functional alias of the target MCVideo user
MCVideo ad hoc group ID	M	The MCVideo group ID to be associated with the ad hoc group call
SDP answer	O	Media parameters selected and present if the Result is success.
Result	M	Result of the ad hoc group call request (success or failure)