Content for TS 23.379 Word version: 19.1.0

1… 7… 7.4… 10… 10.5… 10.6… 10.6.2.2.13… 10.6.2.2.24… 10.6.2.3… 10.6.2.3.1.2… 10.6.2.3.2… 10.6.2.4… 10.6.2.4.3… 10.6.2.5… 10.6.2.5.2.3… 10.6.2.6… 10.6.2.6.2… 10.6.2.7… 10.6.2.10… 10.6.3… 10.7… 10.7.2.2… 10.7.2.3… 10.7.3… 10.7.4… 10.7.5… 10.7.5.2.3a… 10.7.6… 10.7.6.2.3… 10.9… 10.9.1.3… 10.9.1.3.2… 10.9.1.3.3… 10.9.1.4… 10.9.1.5… 10.9.2… 10.9.2.6… 10.10… 10.12… 10.14… 10.15… 10.19… 10.19.2.11… 10.19.3… 10.19.3.1.4… 10.19.3.2… 10.19.3.2.4… 10.19.3.2.6… A… A.4… B…

10.19 Ad hoc group call 10.19.1 General 10.19.2 Information flows 10.19.2.1 Ad hoc group call request (MCPTT client - MCPTT server) 10.19.2.2 Ad hoc group call request return (MCPTT server - MCPTT client) 10.19.2.3 Ad hoc group call request (MCPTT server - MCPTT server) 10.19.2.4 Ad hoc group call request (MCPTT server - MCPTT client) 10.19.2.5 Ad hoc group call response (MCPTT server - MCPTT client) 10.19.2.6 Ad hoc group call response (MCPTT server - MCPTT server) 10.19.2.7 Ad hoc group call response (MCPTT client - MCPTT server) 10.19.2.8 Ad hoc group call release request (MCPTT server - MCPTT client) 10.19.2.8a Ad hoc group call release request (MCPTT client - MCPTT server) 10.19.2.9 Ad hoc group call release response (MCPTT client - MCPTT server) 10.19.2.9a Ad hoc group call release response (MCPTT server - MCPTT client) 10.19.2.10 Ad hoc group call notify (MCPTT server - MCPTT client)
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10.19 Ad hoc group call |R18| p. 224

10.19.1 General p. 224

This subclause contains procedures for ad hoc group call across a one or more MCPTT 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 MCPTT server. The MCPTT 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 MCPTT group.

The preconfigured MCPTT group that provides the configuration is not used for the MCPTT group communication, it only provides configuration for one or more adhoc group calls. The MCPTT group ID of the ad hoc group call is provided by the MCPTT 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.

10.19.2 Information flows p. 224

10.19.2.1 Ad hoc group call request (MCPTT client - MCPTT server) p. 224

Table 10.19.2.1-1 describes the information flow ad hoc group call request from the MCPTT client to the MCPTT server.

Table 10.19.2.1-1: Ad hoc group call request information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the calling party
Functional alias	O	The functional alias of the calling party
MCPTT ad hoc group ID (see NOTE 1)	O	The MCPTT 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
MCPTT ID list (see NOTE 3, NOTE 6, NOTE 7)	O	MCPTT IDs of the participants being invited for the ad hoc group call
SDP offer	M	Offered Media parameters
Implicit floor request (see NOTE 4)	O	When originating client requests the floor, this element shall be included
Broadcast indicator (see NOTE 5)	O	Indicates that the ad hoc group call request is for a broadcast ad hoc group call
Imminent peril indicator (see NOTE 5)	O	Indicates that the ad hoc group call request is an MCPTT imminent peril ad hoc group call
Emergency Indicator (see NOTE 5)	O	Indicates that the ad hoc group call request is an MCPTT emergency ad hoc group call
MCPTT 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 MCPTT server for determining the participants e.g., it can be a location based criteria to invite participants 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 MCPTT server assigns an MCPTT 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 floor. 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.

10.19.2.2 Ad hoc group call request return (MCPTT server - MCPTT client) p. 226

Table 10.19.2.2-1 describes the information flow ad hoc group call request return from the MCPTT server to the MCPTT client. This response could be intermediate response to provide the server assigned MCPTT ad hoc group ID.

Table 10.19.2.2-1: Ad hoc group call request return information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the calling party
MCPTT ad hoc group ID (see NOTE)	O	The MCPTT group ID to be associated with the ad hoc group call which is either provided by the group call initiator or assigned by the MCPTT server. This information element shall be present if the authorization result is success.
Pre-configured group ID (see NOTE)	O	The preconfigured MCPTT 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.

10.19.2.3 Ad hoc group call request (MCPTT server - MCPTT server) p. 226

Table 10.19.2.3-1 describes the information flow ad hoc group call request between the MCPTT servers.

Table 10.19.2.3-1: Ad hoc group call request information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the calling party
Functional alias	O	The functional alias of the calling party
MCPTT ad hoc group ID	M	The MCPTT group ID to be associated with the ad hoc group call
MCPTT ID list (see NOTE 1, NOTE 3)	O	MCPTT IDs of the participants being invited for the ad hoc group call
SDP offer	M	Offered Media parameters of MCPTT 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 MCPTT imminent peril ad hoc group call
Emergency Indicator (see NOTE 2)	O	Indicates that the ad hoc group call request is an MCPTT emergency ad hoc group call
Preconfigured MCPTT group ID	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 MCPTT 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.

10.19.2.4 Ad hoc group call request (MCPTT server - MCPTT client) p. 227

Table 10.19.2.4-1 describes the information flow ad hoc group call request from the MCPTT server to the MCPTT client.

Table 10.19.2.4-1: Ad hoc group call request information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the calling party
MCPTT ID	M	The identity of the MCPTT user towards which the request is sent
Functional alias	O	The functional alias of the calling party
MCPTT ad hoc group ID	M	The MCPTT group ID to be associated with the ad hoc group call
SDP offer	M	Offered Media parameters of MCPTT server
Broadcast indicator (see NOTE 1)	O	Indicates that the ad hoc group call request is for a broadcast ad hoc group call
Imminent peril indicator (see NOTE 1)	O	Indicates that the ad hoc group call request is an MCPTT imminent peril ad hoc group call
Emergency Indicator (see NOTE 1)	O	Indicates that the ad hoc group call request is an MCPTT emergency ad hoc group call
Preconfigured MCPTT group ID	O	Group identity whose configuration is to be applied for this ad hoc group call.
NOTE 1: If used, only one of these information elements is present.

10.19.2.5 Ad hoc group call response (MCPTT server - MCPTT client) p. 228

Table 10.19.2.5-1 describes the information flow ad hoc group call response from the MCPTT server to the MCPTT client.

Table 10.19.2.5-1: Ad hoc group call response information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the calling party
Functional alias	O	The functional alias of the calling party
MCPTT ad hoc group ID	M	The MCPTT group ID 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)

10.19.2.6 Ad hoc group call response (MCPTT server - MCPTT server) p. 228

Table 10.19.2.6-1 describes the information flow ad hoc group call response between the MCPTT servers.

Table 10.19.2.6-1: Ad hoc group call response information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the target MCPTT user
Functional alias	O	The functional alias of the target MCPTT user
MCPTT ad hoc group ID	M	The MCPTT group ID 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)

10.19.2.7 Ad hoc group call response (MCPTT client - MCPTT server) p. 229

Table 10.19.2.7-1 describes the information flow ad hoc group call response from the MCPTT client to the MCPTT server.

Table 10.19.2.7-1: Ad hoc group call response information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the target MCPTT user
Functional alias	O	The functional alias of the target MCPTT user
MCPTT ad hoc group ID	M	The MCPTT group ID 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)

10.19.2.8 Ad hoc group call release request (MCPTT server - MCPTT client) p. 229

Table 10.19.2.8-1 describes the information flow ad hoc group call release request from the MCPTT server to the MCPTT client.

Table 10.19.2.8-1: Ad hoc group call release request information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the ad hoc group call participant
Functional alias	O	The functional alias of the ad hoc group call participant
MCPTT ad hoc group ID	M	The MCPTT group ID of the ad hoc group call on which call is released

10.19.2.8a Ad hoc group call release request (MCPTT client - MCPTT server) |R19| p. 229

Table 10.19.2.8a-1 describes the information flow ad hoc group call release request from the MCPTT client to the MCPTT server.

Table 10.19.2.8a-1: Ad hoc group call release request information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the user authorized to release the ad hoc group call.
Functional alias	O	The functional alias of the authorized user requesting to release the ad hoc group call.
MCPTT ad hoc group ID	M	The MCPTT group ID of the ad hoc group call on which call is released.

10.19.2.9 Ad hoc group call release response (MCPTT client - MCPTT server) p. 230

Table 10.19.2.9-1 describes the information flow ad hoc group call release response from the MCPTT client to the MCPTT server.

Table 10.19.2.9-1: Ad hoc group call release response information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the ad hoc group call participant
Functional alias	O	The functional alias of the ad hoc group call participant
MCPTT ad hoc group ID	M	The MCPTT group ID of the ad hoc group call that is released

10.19.2.9a Ad hoc group call release response (MCPTT server - MCPTT client) |R19| p. 230

Table 10.19.2.9a-1 describes the information flow ad hoc group call release response from the MCPTT server to the MCPTT client.

Table 10.19.2.9a-1: Ad hoc group call release response information elements

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of the user authorized to release the ad hoc group call.
Functional alias	O	The functional alias of the authorized user requesting to release the ad hoc group call.
MCPTT ad hoc group ID	M	The MCPTT group ID of the ad hoc group call that is released.

10.19.2.10 Ad hoc group call notify (MCPTT server - MCPTT client) p. 230

Table 10.19.2.10-1 describes the information flow ad hoc group call notify from MCPTT server to MCPTT client.

Table 10.19.2.10-1: Ad hoc group call notify

Information element	Status	Description
MCPTT ID	M	The MCPTT ID of ad hoc group call participant
Functional alias	O	The associated functional alias of the MCPTT user of the ad hoc group call participant
MCPTT ad hoc group ID	M	The MCPTT group ID associated with the ad hoc group call
MCPTT ID list	O	The list of the invited MCPTT users who did not acknowledge the ad hoc group call request within a configured time or the list of the invited MCPTT users who acknowledged the ad hoc group call request and joined or the list of the MCPTT users who joined or left the ongoing MCPTT ad hoc group call.