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7.17 Ad hoc group data communication7.17.1 General7.17.2 Common Information flows7.17.2.1 Ad hoc group data session request (MCData client - MCData server)7.17.2.2 Ad hoc group data session request return (MCData server - MCData client)7.17.2.3 Ad hoc group data session request (MCData server - MCData server)7.17.2.4 Ad hoc group data session request (MCData server - MCData client)7.17.2.5 Ad hoc group data session response (MCData server - MCData client)7.17.2.6 Ad hoc group data session response (MCData server - MCData server)7.17.2.7 Ad hoc group data session response (MCData client - MCData server)7.17.2.8 Ad hoc group data session release request (MCData server - MCData client)7.17.2.9 Ad hoc group data session release response (MCData client - MCData server)7.17.2.10 Ad hoc group data session notify (MCData server - MCData client)7.17.2.11 Modify ad hoc group data session participants request (MCData client - MCData server)7.17.2.12 Modify ad hoc group data session participants response (MCData server - MCData client)7.17.2.13 Ad hoc group data session leave request (MCData server - MCData client)7.17.2.14 Ad hoc group data session leave response (MCData client - MCData server)7.17.2.15 Ad hoc group data session get userlist (MCData server - MCData server)7.17.2.16 Ad hoc group data session get userlist response (MCData server - MCData server)7.17.2.17 Ad hoc group data session add user notification (MCData server - MCData server)7.17.2.18 Ad hoc group data session remove user notification (MCData server - MCData server)7.17.2.19 Ad hoc group data session release notification (MCData server - MCData server)7.17.2.20 Modify ad hoc group data session criteria request (MCData client - MCData server)7.17.2.21 Modify ad hoc group data session criteria response (MCData server - MCData client)
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7.17  Ad hoc group data communication |R18|p. 217

7.17.1  Generalp. 217

This subclause contains procedures for ad hoc group data communication across a single MCData system for both SDS and FD services, and associated functions such as emergency data communication, Imminent peril data communication and others.
The ad hoc group data communications can use the participants list provided by either an initiator of the data communication or MCData server. The MCData server can use the criteria provided by the initiator of the data communication 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 MCData group.
The preconfigured MCData group that provides the configuration is not used for the MCData group communication, it only provides configuration for one or more adhoc group data communications. The MCData group ID of the ad hoc group data communication is provided by the MCData server when the ad hoc group data communication is originated. In order to establish security context for the end-to-end secured ad hoc group data communication, the security related information is used from this preconfigured group.
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7.17.2  Common Information flowsp. 217

7.17.2.1  Ad hoc group data session request (MCData client - MCData server)p. 217

Table 7.17.2.1-1 describes the information flow ad hoc group data session request from the MCData client to the MCData server.
Information element Status Description
MCData IDMThe identity of the MCData user sending data
Functional aliasOThe associated functional alias of the MCData user sending data.
MCData ad hoc group ID (see NOTE 1)OThe MCData group ID to be associated with the ad hoc group data communication
Encryption supported (see NOTE 2)OIndicates whether this ad hoc group data communication supports end-to-end encryption
MCData ID list (see NOTE 3, NOTE 5, NOTE 6)OMCData IDs of the participants being invited for the ad hoc group data communication
SDP offerMOffered media parameters
Imminent peril indicator (see NOTE 4)OIndicates that the ad hoc group data communication request is for ad hoc group imminent peril data communication
Emergency Indicator (see NOTE 4)OIndicates that the ad hoc group data communication request is for ad hoc group emergency data communication
Broadcast indicator (see NOTE 4)OIndicates that the ad hoc group data communication request is for a broadcast ad hoc group data communication
MCData ID list (see NOTE 3)OList of participants required to acknowledge the ad hoc group data communication before start of the data transmission
Location informationOLocation of the of the MCData user sending data.
Criteria for determining the participants (see NOTE 5)OCarries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCData server for determining the participants e.g., it can be a location based criteria to invite participants in a particular area
Requested priorityOApplication priority level requested for this ad hoc group data communication
NOTE 1:
If this information element is not included, the MCData server assigns an MCData ad hoc group ID to be used for the ad hoc group data communication. This information element is returned to the MCData user who is sending the data to use in the ad hoc group data 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 data communication is encrypted. When the ad hoc group data communication 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 data communication is unencrypted.
NOTE 3:
This element is included only when the data communication initiating client sends the list of participants.
NOTE 4:
If used, only one of these information elements is present.
NOTE 5:
Only one of these information elements is present.
NOTE 6:
If the request follows an ad hoc group for emergency alert, then this element is not present.
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7.17.2.2  Ad hoc group data session request return (MCData server - MCData client)p. 220

Table 7.17.2.2-1 describes the information flow ad hoc group data session request return from the MCData server to the MCData client. This response could be intermediate response to provide the server assigned MCData ad hoc group ID.
Information element Status Description
MCData IDMThe identity of the MCData user sending data
MCData ad hoc group IDOThe MCData group ID to be associated with the ad hoc group data communication which is either provided by the group data session initiator or assigned by the MCData server. This information element shall be present if the authorization result is success.
Preconfigured MCData group IDOGroup identity whose configuration is to be applied for this ad hoc group data communication.
Authorization resultMIndicate if authorization is success or failure
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7.17.2.3  Ad hoc group data session request (MCData server - MCData server)p. 220

Table 7.17.2.3-1 describes the information flow ad hoc group data session request between the MCData servers.
Information element Status Description
MCData IDMThe identity of the MCData user sending data
Functional aliasOThe associated functional alias of the MCData user sending data.
MCData ad hoc group IDMThe MCData group ID to be associated with the ad hoc group data communication
MCData ID list (see NOTE 1, NOTE 3)OMCData IDs of the participants being invited for the ad hoc group data communication
SDP offerMMedia parameters of MCData server
Broadcast indicator (see NOTE 2)OIndicates that the ad hoc group data communication request is for a broadcast ad hoc group data communication
Imminent peril indicator (see NOTE 2)OIndicates that the ad hoc group data communication request is for ad hoc group imminent peril data communication
Emergency Indicator (see NOTE 2)OIndicates that the ad hoc group data communication request is for ad hoc group emergency data communication
Preconfigured MCData group IDOGroup identity whose configuration is to be applied for this ad hoc group data communication.
Criteria for determining the participants (see NOTE 3)OCarries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCData server for determining the participants e.g., it can be a location based criteria to invite participants in a particular area
Requested priorityOApplication priority level requested for this group data communication
NOTE 1:
This element is included only when the data communication initiating 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.
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7.17.2.4  Ad hoc group data session request (MCData server - MCData client)p. 221

Table 7.17.2.4-1 describes the information flow ad hoc group data session request from the MCData server to the MCData client.
Information element Status Description
MCData IDMThe identity of the MCData user sending data
MCData IDMThe identity of the MCData user towards which the request is sent
Functional aliasOThe associated functional alias of the MCData user sending data.
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group data communication
SDP offerMMedia parameters of MCData server
Broadcast indicator (see NOTE)OIndicates that the ad hoc group data communication request is for a broadcast ad hoc group data communication
Imminent peril indicator (see NOTE)OIndicates that the ad hoc group data communication request is for ad hoc group imminent peril data communication
Emergency Indicator (see NOTE)OIndicates that the ad hoc group data communication request is for ad hoc group emergency data communication
Preconfigured MCData group IDOGroup identity whose configuration is to be applied for this ad hoc group data communication.
NOTE:
If used, only one of these information elements is present.
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7.17.2.5  Ad hoc group data session response (MCData server - MCData client)p. 222

Table 7.17.2.5-1 describes the information flow ad hoc group data session response from the MCData server to the MCData client.
Information element Status Description
MCData IDMThe identity of the MCData user sending data
Functional aliasOThe associated functional alias of the MCData user sending data.
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group data communication
SDP answerOMedia parameters selected and present if the Result is success.
ResultMResult of the group data communication request (success or failure)
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7.17.2.6  Ad hoc group data session response (MCData server - MCData server)p. 222

Table 7.17.2.6-1 describes the information flow ad hoc group data session response between the MCData servers.
Information element Status Description
MCData IDMThe identity of the MCData user receiving data
Functional aliasOThe functional alias of the MCData user receiving data
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group data communication
SDP answerOMedia parameters selected and present if the Result is success.
ResultMResult of the ad hoc group data communication request (success or failure)
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7.17.2.7  Ad hoc group data session response (MCData client - MCData server)p. 223

Table 7.17.2.7-1 describes the information flow ad hoc group data session response from the MCData client to the MCData server.
Information element Status Description
MCData IDMThe identity of the MCData user receiving data
Functional aliasOThe functional alias of the MCData user receiving data
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group data communication
SDP answerOMedia parameters selected and present if the Result is success.
ResultMResult of the ad hoc group data communication request (success or failure)
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7.17.2.8  Ad hoc group data session release request (MCData server - MCData client)p. 223

Table 7.17.2.8-1 describes the information flow ad hoc group data session release request from the MCData server to the MCData client.
Information element Status Description
MCData IDMThe MCData ID of the ad hoc group data communication participant
Functional aliasOThe functional alias of the ad hoc group data communication participant
MCData ad hoc group IDMThe MCData group ID of the ad hoc group data communication on which data communication is released
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7.17.2.9  Ad hoc group data session release response (MCData client - MCData server)p. 224

Table 7.17.2.9-1 describes the information flow ad hoc group data session release response from the MCData server to the MCData client.
Information element Status Description
MCData IDMThe MCData ID of the ad hoc group data communication participant
Functional aliasOThe functional alias of the ad hoc group data communication participant
MCData ad hoc group IDMThe MCData group ID of the ad hoc group data communication on which data communication is released
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7.17.2.10  Ad hoc group data session notify (MCData server - MCData client)p. 224

Table 7.17.2.10-1 describes the information flow ad hoc group data session notify from MCData server to MCData client.
Information element Status Description
MCData IDMThe MCData ID of the ad hoc group data communication participant
Functional aliasOThe associated functional alias of the MCData user of the ad hoc group data communication participant
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group data communication
MCData ID listOThe list of the invited MCData users who did not acknowledged the ad hoc group data communication request within a configured time or the list of the invited MCData users who acknowledged the ad hoc group data communication request and joined or the list of the MCData users who joined or left the ongoing MCData ad hoc group data communication.
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7.17.2.11  Modify ad hoc group data session participants request (MCData client - MCData server)p. 224

Table 7.17.2.11-1 describes the information flow Modify ad hoc group data session participants request from the MCData client to the MCData server.
Information element Status Description
MCData IDMThe MCData ID of the MCData user who is requesting for modification of ad hoc group data session participants
Functional aliasOThe associated functional alias of the MCData user who is requesting for modification of ad hoc group data session participants
MCData ad hoc group IDMThe MCData group ID of ad hoc group data communication whose participants list needs to be modified
MCData ID list (see NOTE)OList of additional MCData users to be added to the on-going ad hoc group data communication
MCData ID list (see NOTE)OList of MCData users to be removed from the on-going ad hoc group data communication
NOTE:
Either one or both of these information elements is present
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7.17.2.12  Modify ad hoc group data session participants response (MCData server - MCData client)p. 225

Table 7.17.2.12-1 describes the information flow Modify ad hoc group data session participants response from the MCData server to the MCData client.
Information element Status Description
MCData IDMThe MCData ID of the MCData user who is requesting for modification of ad hoc group data session participants
Functional aliasOThe associated functional alias of the MCData user who is requesting for modification of ad hoc group data session participants
MCData ad hoc group IDMThe MCData group ID of ad hoc group data communication whose participants list needs to be modified
ResultMResult of the modify ad hoc group data communication participants request (success or failure)
MCData ID listOList of MCData users who are not allowed to be added to the on-going ad hoc group data communication. This list is provided if the operation is partially success.
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7.17.2.13  Ad hoc group data session leave request (MCData server - MCData client)p. 225

Table 7.17.2.13-1 describes the information flow ad hoc group data session leave request from the MCData server to the MCData client.
Information element Status Description
MCData IDMThe MCData ID of the ad hoc group data communication participant leaving the ad hoc group data communication
MCData ad hoc group IDMThe MCData group ID of ad hoc group data communication
Reason to leaveOCarries the reason of why the MCData client is being asked to leave the ongoing ad hoc group data communication
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7.17.2.14  Ad hoc group data session leave response (MCData client - MCData server)p. 226

Table 7.17.2.14-1 describes the information flow Ad hoc group data session leave response from the MCData client to the MCData server.
Information element Status Description
MCData IDMThe MCData ID of the ad hoc group data communication participant leaving the ad hoc group data communication
MCData ad hoc group IDMThe MCData group ID of ad hoc group data communication
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7.17.2.15  Ad hoc group data session get userlist (MCData server - MCData server) |R19|p. 226

Table 7.17.2.15-1 describes the information flow ad hoc group data session get userlist from one MCData server to another MCData server.
Information element Status Description
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group communication
Criteria for determining the participantsMCarries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCData server for determining the participants e.g., it can be a location based criteria to invite participants in a particular area
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7.17.2.16  Ad hoc group data session get userlist response (MCData server - MCData server) |R19|p. 226

Table 7.17.2.16-1 describes the information flow ad hoc group data session get userlist response from one MCData server to another MCData server.
Information element Status Description
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group communication
MCData ID listMList of MCData IDs meeting the criteria specified in the ad hoc group data session get userlist
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7.17.2.17  Ad hoc group data session add user notification (MCData server - MCData server) |R19|p. 227

Table 7.17.2.17-1 describes the information flow Ad hoc group data session add user notification from one MCData server to another MCData server. This notification is to provide the list of MCData IDs meeting the criteria specified in the ad hoc group data session get userlist request from one MCData server to another MCData server.
Information element Status Description
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group communication
MCData ID listMList of MCData IDs meeting the criteria specified in the ad hoc group data session get userlist
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7.17.2.18  Ad hoc group data session remove user notification (MCData server - MCData server) |R19|p. 227

Table 7.17.2.18-1 describes the information flow Ad hoc group data session remove user notification from one MCData server to another MCData server. This notification is to provide the list of MCData IDs no longer meeting the criteria specified in the ad hoc group data session get userlist request from one MCData server to another MCData server.
Information element Status Description
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group communication
MCData ID listMList of MCData IDs no longer meeting the criteria specified in the ad hoc group data session get userlist
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7.17.2.19  Ad hoc group data session release notification (MCData server - MCData server) |R19|p. 227

Table 7.17.2.19-1 describes the information flow Ad hoc group data session release notification from one MCData server to another MCData server. This notification is to indicate to stop evaluating the criteria to determine the participants list if another MCData server is having the criteria specified in the ad hoc group data session get userlist request.
Information element Status Description
MCData ad hoc group IDMThe MCData group ID associated with the ad hoc group communication
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7.17.2.20  Modify ad hoc group data session criteria request (MCData client - MCData server) |R19|p. 228

Table 7.17.2.20-1 describes the information flow Modify ad hoc group data session criteria request from the MCData client to the MCData server.
Information element Status Description
MCData IDMThe MCData ID of the MCData user who is requesting for modification of ad hoc group data session participants
Functional aliasOThe associated functional alias of the MCData user who is requesting for modification of ad hoc group data session participants
MCData ad hoc group IDMThe MCData group ID of ad hoc group data communication whose participants list needs to be modified
Criteria to determine the list of participantsOCarries the details of criteria or meaningful label identifying the criteria or the combination of both which will be used by the MCData server for determining the participants e.g., it can be a location-based criteria to invite participants in a particular area
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7.17.2.21  Modify ad hoc group data session criteria response (MCData server - MCData client) |R19|p. 228

Table 7.17.2.21-1 describes the information flow Modify ad hoc group data session criteria response from the MCData server to the MCData client.
Information element Status Description
MCData IDMThe MCData ID of the MCData user who is requesting for modification of ad hoc group data session participants
Functional aliasOThe associated functional alias of the MCData user who is requesting for modification of ad hoc group data session participants
MCData ad hoc group IDMThe MCData group ID of ad hoc group data communication whose participants list needs to be modified
ResultMResult of the modify ad hoc group data communication participants request (success or failure)
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