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10.1.1 Information flows for affiliation
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10.1.1.1 General
The following subclauses define information flows for affiliation on the IWF-1 interface. Affiliation related information flows on reference points other than IWF-1 are defined in 3GPP TS 23.280 [5].
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10.1.1.2 IWF group affiliation request
Table 10.1.1.2-1 describes the information flow IWF group affiliation request between the IWF and an MC service server and between an MC service server and the IWF. Table 10.1.1.2-1: IWF group affiliation request Information element Status Description MC service ID M The MC service ID of the originator (LMR user...
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10.1.1.3 IWF group affiliation response
Table 10.1.1.3-1 describes the information flow IWF group affiliation response between the IWF and an MC service server and between an MC service server and the IWF. Table 10.1.1.3-1: IWF group affiliation response Information element Status Description MC service ID M The MC service ID of the originator (LMR u...
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10.1.1.4 IWF group de-affiliation request
Table 10.1.1.4-1 describes the information flow IWF group de-affiliation request between the IWF and an MC service server and between an MC service server and the IWF. Table 10.1.1.4-1: IWF group de-affiliation request Information element Status Description MC service ID M The MC service ID of the originator (LM...
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10.1.1.5 IWF group de-affiliation response
Table 10.1.1.5-1 describes the information flow IWF group de-affiliation response between the IWF and an MC service server and between an MC service server and the IWF. Table 10.1.1.5-1: IWF group de-affiliation response Information element Status Description MC service ID M The MC service ID of the originator ...
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10.1.2 Affiliation procedures
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10.1.2.1 General
When an interworking group is defined in the MCPTT system, the LMR system (via the IWF) informs the MCPTT system of group affiliations in one of the following ways: - Every group affiliation in the LMR system results in an affiliation sent to the MCPTT system, which contains the identity (with appropriate translation ...
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10.1.2.2 Group affiliation to a group defined in the MC system
The LMR system may affiliate its group members to an interworking group defined in the MC system via the IWF. For group regroup, the affiliated group members are automatically affiliated to the temporary group. The signalling procedure of interworking group affiliation is described in figure 10.1.2.2-1. Pre-conditio...
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10.1.2.3 Group de-affiliation from a group defined in the MC system
The signalling procedure of interworking group de-affiliation from a group defined in the MC system is described in figure 10.1.2.3-1. The LMR system manages the individual de-affiliation requests from the LMR users. The LMR system can de-affiliate its group members from the interworking group via the IWF. Pre-condit...
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10.1.2.4 Group affiliation to group defined in the LMR system
The MC system may affiliate its group members to an interworking group defined in the LMR system via the IWF. The signalling procedure of group affiliation via the IWF is described in figure 10.1.2.4‑1. Pre-conditions: 1. The group to be affiliated to is defined in the LMR system. 2. The IWF is connected to and is ...
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10.1.2.5 Group de-affiliation from a group defined in the LMR system
The signalling procedure of interworking group de-affiliation from a group defined in the LMR system is described in figure 10.1.2.5-1. The MC system manages the individual de-affiliation requests from the MC service users. The MC system may de-affiliate its group members from the interworking group via the IWF. Pre-...
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10.2 Group management
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10.2.1 Information flows for group management
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10.2.1.1 General
The following subclauses define information flows for group management on the IWF-1 interface. Group management related information flows on reference points other than IWF-1 are defined in 3GPP TS 23.280 [5].
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10.2.1.2 IWF group regroup teardown notification
Table 10.2.1.2-1 describes the information flow IWF group regroup teardown notification between the group management server and the IWF or between the IWF and the group management server. Table 10.2.1.2-1: IWF group regroup teardown notification Information element Status Description MC service group ID M MC ser...
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10.2.1.3 IWF group regroup teardown notification response
Table 10.2.1.3-1 describes the information flow IWF group regroup teardown notification response between the group management server and the IWF or between the IWF and the group management server. Table 10.2.1.3-1: IWF group regroup teardown notification response Information element Status Description MC service g...
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10.2.1.4 IWF group regroup request
Table 10.2.1.4-1 describes the information flow IWF group regroup request between the group management server and the IWF or between the IWF and the group management server. Table 10.2.1.4-1: IWF group regroup request Information element Status Description MC service group ID list M List of constituent MC servic...
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10.2.1.5 IWF group regroup response
Table 10.2.1.5-1 describes the information flow IWF group regroup response between the group management server and the IWF or between the IWF and the group management server. Table 10.2.1.5-1: IWF group regroup response Information element Status Description MC service group ID O (see NOTE) MC service group ID o...
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10.2.1.6 IWF group regroup notification
Table 10.2.1.6-1 describes the information flow IWF group regroup notification between the group management server and the IWF or between the IWF and the group management server. Table 10.2.1.6-1: IWF group regroup notification Information element Status Description MC service group ID list M List of constituent...
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10.2.1.7 IWF group regroup notification response
Table 10.2.1.7-1 describes the information flow IWF group regroup notification response between the group management server and the IWF or between the IWF and the group management server. Table 10.2.1.7-1: IWF group regroup notification response Information element Status Description MC service group ID list M L...
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10.2.1.8 IWF group information request
Table 10.2.1.8-1 describes the IWF group information request from the IWF to the group management server or from the group management server to the IWF. Table 10.2.1.8-1: IWF group information request Information element Status Description MC service group ID M The identity of the MC service group.
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10.2.1.9 IWF group information response
Table 10.2.1.9-1 describes the IWF group information response from the group management server to the IWF or the IWF to the group management server. Table 10.2.1.9-1: IWF group information response Information element Status Description MC service group ID M The identity of the MC service group. MC service ...
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10.2.1.10 IWF group information provision request
Table 10.2.1.10-1 describes the IWF group information provision request from the group management server to the IWF or the IWF to the group management server. Table 10.2.1.10-1: IWF group information provision request Information element Status Description MC service group ID M The identity of the MC service gro...
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10.2.1.11 IWF group information provision response
Table 10.2.1.11-1 describes the IWF group information provision response from the IWF to the group management server or from the group management server to the IWF. Table 10.2.1.11-1: IWF group information provision response Information element Status Description MC service group ID M The identity of the MC se...
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10.2.1.12 IWF group information subscribe request
Table 10.2.1.12-1 describes the information flow IWF group information subscribe request from the IWF to the group management server in the MC system for cases where the MC system is the primary system of the group and from the group management server in the MC system to the IWF for cases there the IWF is the primary s...
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10.2.1.13 IWF group information subscribe response
Table 10.2.1.13-1 describes the information flow IWF group information subscribe response from the group management server in the MC system to the IWF for cases where the MC system is the primary system of the group and from the IWF to the group management server in the MC system for cases where the IWF is the primary ...
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10.2.1.14 IWF group information notify request
Table 10.2.1.14-1 describes the information flow IWF group information notify request from the group management server in the MC system to the IWF for cases where the MC system is the primary system of the group and from the IWF to the group management server in the MC system for cases where the IWF is the primary syst...
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10.2.1.15 IWF group information notify response
Table 10.2.1.15-1 describes the information flow IWF group information notify response from the IWF to the group management server in the MC system for cases where the MC system is the primary system of the group and from the group management server in the MC system to the IWF for cases there the IWF is the primary sys...
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10.2.2 Group regrouping
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10.2.2.1 General
The procedures in 3GPP TS 23.280 [5] are followed, but with changes required for interworking. The IWF will behave on the interface as if it is a peer MC service server with a peer group management client and peer group management server. Exceptions to the 3GPP TS 23.280 [5] procedures are detailed in the subclauses b...
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10.2.2.2 MC system initiates the group regroup
The MC system can initiate a group regroup that includes groups defined at the IWF. The IWF is informed and may reject the regroup if conditions do not allow it to support the regroup. This is described in figure 10.2.2.2-1. Pre-conditions: 1. The group management client has retrieved the group configurations of the ...
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10.2.2.3 IWF initiates the group regroup
The procedure in 3GPP TS 23.280 [5] is followed, except for steps 1 and 2. The IWF will behave on the interface as if it is a peer MC service server with a peer group management server. This is described in figure 10.2.2.3-1. Pre-conditions: 1. At least one MC service group has been defined in the MC system. 2. At l...
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10.2.2.4 Ownership of the group regroup
The group management server that performs the group regroup operation owns the temporary group created by the regroup, as implied in 3GPP TS 23.280 [5].
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10.2.2.5 Simultaneous group regroup requests from each side of the IWF-1 interface
To prevent routing issues and complexity that could result from regrouping the same users from both sides of the interface, the following rules can be applied: - If group regrouping signalling using temporary groups is used on the MC system, the IWF must prevent the regroup signalling from propagating to the LMR syste...
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10.2.2.6 Resolution of vocoder and encryption mode for the group regroup
If one of the LMR groups to be included in a group regroup requires the use of LMR E2EE the preferred voice codecs for an MCPTT temporary group should be LMR codecs. If any of the mission critical users to be included in this MCPTT temporary group do not support LMR E2EE or the preferred LMR codecs, voice calls using L...
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10.2.3 Group configuration for interworking
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10.2.3.1 Overview
The procedures in the following subclauses describe the process for sharing group configuration from an MC system to an IWF where the IWF needs to make use of the MC service group and from an IWF to an MC system where the MC system's clients need to make use of the group. The procedures in this subclause are based upon...
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10.2.3.2 MC system provides group configuration to the IWF
Figure 10.2.3.2-1 below illustrates the case where the MC system provides the group configuration to the IWF, e.g. due to an action by an administrator or because the primary MC system of some of the MC service group members is the IWF. Pre-conditions: 1. The MC service group is defined in the MC system. 2. One or m...
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10.2.3.3 IWF requests group configuration from the MC system
Figure 10.2.3.3-1 below illustrates the case where the IWF requests the group configuration from the MC system, for example because a user on the IWF is a member of the group. Pre-conditions: 1. The MC service group is defined in the MC system. 2. One or more LMR users are members of the group. 3. The IWF does not ...
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10.2.3.4 IWF provides group configuration to the MC system
Figure 10.2.3.4-1 below illustrates the case where the IWF provides the group configuration to the MC system, e.g. due to an action by an administrator or because some of the IWF's MC service group members are homed on the MC system. Pre-conditions: 1. The group is defined in the IWF. 2. One or more MC service users...
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10.2.3.5 MC system requests group configuration from the IWF
Figure 10.2.3.5-1 below illustrates the case where the MC system requests the group configuration from the IWF, for example because an MC service user receiving service in the MC system has the group configured in the user profile. Pre-conditions: 1. The MC service group is defined in the IWF. 2. One or more MC serv...
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10.2.3.6 IWF subscribes to group configuration
The procedure for subscription from IWF for group configuration information to the group management server in the primary MC system of the MC service group is shown in figure 10.2.3.6-1. Pre-conditions: 1. The MC service group is defined in its MC system. 2. One or more group members are defined in the LMR system. ...
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10.2.3.7 MC system notifies group configuration
The procedure for notification of group configuration information from the group management server in the primary MC system of the MC service group to the IWF is shown in figure 10.2.3.7-1. Pre-conditions: 1. The IWF has subscribed to the group configuration information for the MC service group in the group managemen...
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10.2.3.8 MC system subscribes to group configuration
The procedure for subscription by the group management server in the MC system to the IWF for group configuration information is shown in figure 10.2.3.8-1. Pre-conditions: 1. The group is defined in the LMR system. 2. One or more group members are defined in the MC system. 3. The group management server in the MC ...
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10.2.3.9 IWF notifies group configuration
The procedure for notification of group information from the IWF to the group management server in the MC system is shown in figure 10.2.3.9-1. Pre-conditions: 1. The group management server of the MC system has subscribed to the group configuration information for the group in the IWF. 2. The IWF has new informatio...
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10.3 Group call
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10.3.1 General
The following subclauses define information flows and signaling procedures for group calls and broadcast group calls. Where the group is defined in the MCPTT system and where the IWF has affiliated to an MCPTT group with a single affiliation on behalf of all LMR group members, only a single IWF group call request / IW...
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10.3.2 Information flows for group call over interworking group
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10.3.2.1 General
The following subclauses define information flows for group calls on the IWF-1 interface. Group call related information flows on reference points other than IWF-1 are defined in 3GPP TS 23.379 [7].
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10.3.2.2 IWF group call request
Table 10.3.2.2-1 describes the information flow IWF group call request from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.2-1: IWF group call request information elements Information Element Status Description MCPTT ID (see NOTE 1) M The MCPTT ID of the calling party Functional...
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10.3.2.3 IWF group call response (IWF – MCPTT server)
Table 10.3.2.3-1 describes the information flow IWF group call response from the MCPTT server to the IWF and from the IWF to MCPTT server. Table 10.3.2.3-1: IWF group call response information elements Information Element Status Description MCPTT ID M The MCPTT ID of the target MCPTT group member MCPTT group ID...
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10.3.2.4 IWF Group-broadcast group call setup request
Table 10.3.2.4-1 describes the information flow IWF group-broadcast group call setup request from the MCPTT server to the IWF and from the IWF to the MCPTT server. Table 10.3.2.4-1: IWF Group-broadcast group call setup request information elements Information Element Status Description MCPTT ID (see NOTE 1) M T...
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10.3.2.5 IWF Group-broadcast group call setup response
Table 10.3.2.5-1 describes the information flow IWF group-broadcast group call setup response from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.5-1: IWF Group-broadcast group call setup response information elements Information Element Status Description MCPTT ID M The MCPTT ID ...
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10.3.2.6 IWF Group-broadcast group call release request
Table 10.3.2.6-1 describes the information flow IWF group-broadcast group call release request from the MCPTT server to the IWF and from the IWF to the MCPTT server. Table 10.3.2.6-1: IWF Group-broadcast group call release request information elements Information Element Status Description MCPTT ID M (see NOTE) ...
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10.3.2.7 IWF group-broadcast group call release response
Table 10.3.2.7-1 describes the information flow IWF group-broadcast group call release request from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.7-1: IWF Group-broadcast group call release response information elements Information Element Status Description MCPTT ID M The MCPTT ...
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10.3.2.8 IWF group join request
Table 10.3.2.8-1 describes the information flow IWF group join request from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.8-1: IWF group join request information elements Information Element Status Description MCPTT ID M The MCPTT ID of the originator of the request. (see NOTE 1...
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10.3.2.9 IWF group join response
Table 10.3.2.9-1 describes the information flow group join response from the MCPTT server to the IWF and from the IWF to the MCPTT server. Table 10.3.2.9-1: IWF group join response information elements Information Element Status Description MCPTT ID M The MCPTT ID of the originator of the request. (see NOTE) M...
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10.3.2.10 IWF group call leave request
Table 10.3.2.10-1 describes the information flow IWF group call leave request from the MCPTT server to the IWF and from the IWF to the MCPTT server. Table 10.3.2.10-1: IWF group call leave request information elements Information Element Status Description MCPTT ID M The MCPTT ID of the MCPTT group member MCPTT...
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10.3.2.11 IWF group call leave response
Table 10.3.2.11-1 describes the information flow IWF group call leave response from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.11-1: IWF group call leave response information elements Information Element Status Description MCPTT ID M The MCPTT ID of the MCPTT group member MCP...
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10.3.2.12 IWF group call release request
Table 10.3.2.12-1 describes the information flow IWF group call release request from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.12-1: IWF group call release request information elements Information element Status Description MCPTT ID (see NOTE) O The MCPTT ID of the initiatin...
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10.3.2.13 IWF group call release response
Table 10.3.2.13-1 describes the information flow IWF group call release response from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.13-1: IWF group call release response information elements Information Element Status Description MCPTT ID M The MCPTT ID of the target MCPTT group ...
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10.3.2.14 IWF pre-configured regroup request
Table 10.3.2.14-1 describes the information flow IWF pre-configured regroup request from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.14-1 IWF pre-configured regroup request information elements Information Element Status Description MCPTT ID M The MCPTT ID of the requester MCP...
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10.3.2.15 IWF pre-configured regroup response
Table 10.3.2.15-1 describes the information flow IWF pre-configured regroup response from IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.15-1 IWF pre-configured regroup response information elements Information Element Status Description MCPTT ID M The MCPTT ID of the requester of the...
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10.3.2.16 IWF pre-configured regroup cancel request
Table 10.3.2.16-1 describes the information flow pre-configured regroup cancel request from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.16-1 IWF pre-configured regroup cancel request information elements Information Element Status Description MCPTT ID M The MCPTT ID of the requ...
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10.3.2.17 IWF pre-configured regroup cancel response
Table 10.3.2.17-1 describes the information flow IWF pre-configured regroup cancel response from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.17-1 IWF pre-configured regroup cancel response information elements Information Element Status Description MCPTT ID M The MCPTT ID of th...
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10.3.2.18 IWF pre-configured regroup reject (IWF – MCPTT server, MCPTT server - IWF)
Table 10.3.2.18-1 describes the information flow IWF pre-configured regroup reject from the IWF to the MCPTT server and from the MCPTT server to the IWF. Table 10.3.2.18-1 IWF pre-configured regroup reject information elements Information Element Status Description MCPTT group ID M MCPTT group ID of the regroup ...
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10.3.3 Pre-arranged group call
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10.3.3.1 General
The subclauses 10.3.3.2 and 10.3.3.3 describe the group call setup between the MCPTT system and the LMR system on an interworking group defined in the MCPTT system. The subclauses 10.3.3.4 and 10.3.3.5 describe the group call setup between the MCPTT system and the LMR system on an interworking group defined in the LMR ...
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10.3.3.2 Group call setup initiated by MCPTT user on an interworking group defined in MCPTT system
In this procedure, an MCPTT user is initiating a group call on an interworking group defined in the MCPTT system. The signalling procedure is described in figure 10.3.3.2-1. This subclause is based upon subclause for pre-arranged group call setup in 3GPP TS 23.379 [7], subclause 10.6.2.3.1.1.2. Pre-conditions: 1. Th...
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10.3.3.3 Group call setup initiated by LMR user on an interworking group defined in MCPTT system.
In this procedure, an LMR user is initiating a group call on an interworking group defined in the MCPTT system. The signalling procedure is described in figure 10.3.3.3-1. This subclause is based upon subclause for pre-arranged group call setup in 3GPP TS 23.379 [7], subclause 10.6.2.3.1.1.2. Pre-conditions: 1. The ...
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10.3.3.4 Group call setup initiated by MCPTT user on an interworking group defined in the LMR system
In this procedure, an MCPTT user is initiating a group call on an interworking group defined in the LMR system. The signalling procedure is described in figure 10.3.3.4-1. This subclause is based upon subclause for Pre-arranged group call setup in 3GPP TS 23.379 [7], subclause 10.6.2.3.1.1.2. Pre-conditions: 1. The ...
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10.3.3.5 Group call setup initiated by LMR user on an interworking group defined in the LMR system.
In this procedure, an LMR user is initiating a group call on an interworking group defined in the LMR system. The signalling procedure is described in figure 10.3.3.5-1. This subclause is based upon subclause for Pre-arranged group call setup in 3GPP TS 23.379 [7], subclause 10.6.2.3.1.1.2. Pre-conditions: 1. The in...
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10.3.3.6 Encrypted group call with transcoding
Pre-conditions: 1. An MCPTT session is established between an MCPTT client, the interworked LMR system (represented by the IWF), and the MCPTT server. 2. There is an ongoing media transmission. 3. An SDP negotiation has occurred between the IWF and MCPTT Server to establish both the vocoder and the security paramete...
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10.3.3.7 Late Entry
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10.3.3.7.1 General
Late Entry for an ongoing interworking group call is triggered by a successful group affiliation procedure from the participating system. NOTE: These procedures apply to all types of group calls, including, for example, emergency call, imminent peril call and broadcast call.
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10.3.3.7.2 Group call late entry on an interworking group defined in the MCPTT system
In this procedure, the group affiliation from IWF triggers a late entry procedure in the MCPTT system. The signalling procedure is described in figure 10.3.3.7.2-1. For the first affiliating LMR user, this procedure is applicable for both IWF affiliation options (see subclauses 10.1.2.1 and 10.3.1). For the following ...
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10.3.3.7.3 Group call late entry on an interworking group defined in the LMR system
In this procedure, the group affiliation from MCPTT system triggers a late entry procedure in the LMR system. The signalling procedure is described in figure 10.3.3.7.3-1. This procedure describes the affiliation and late entry of the first MCPTT user into the interworking group, but it is applicable also for all subs...
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10.3.3.8 Interworking group call release
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10.3.3.8.1 General
The procedures in this subclause define the cases where the group host server releases an ongoing interworking group call for all the participants of that group. If the group host server is an MCPTT server, the release conditions are described in 3GPP TS 23.379 [7], subclause 10.6.2.4.1.2. If the group host server is...
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10.3.3.8.2 Group call release on an interworking group defined in the MCPTT system
In this procedure, the MCPTT system is releasing a group call on an interworking group defined in the MCPTT system. The signalling procedure is described in figure 10.3.3.8.2-1. This subclause is based upon subclause 10.6.2.4.1.2 Group call release in 3GPP TS 23.379 [7]. Pre-conditions: 1. The interworking group inf...
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10.3.3.8.3 Group call release on an interworking group defined in the LMR system
In this procedure, the LMR system is releasing a group call on an interworking group defined in the LMR system. The signalling procedure is described in figure 10.3.3.8.3-1. This subclause is based upon subclause 10.6.2.4.1.2 Group call release in 3GPP TS 23.379 [7]. Pre-conditions: 1. The interworking group informa...
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10.3.4 Group broadcast
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10.3.4.1 General
A broadcast group call is a special group call where the initiating user expects no response from the receiving users so that when the transmission is complete, so is the call. The initiating user can be an MCPTT user or can be an LMR user. The group-broadcast group is defined as a set of groups, not a set of users. T...
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10.3.4.2 Group-broadcast group call procedure with an interworking group where the group-broadcast group is defined in the MCPTT system
3GPP TS 23.379 [7], subclause 10.6.2.5.2.1 describes the procedure for a group-broadcast group call within a single MCPTT system. The present procedure describes a group-broadcast group call that includes the IWF. In this procedure, the MCPTT server is initiating the broadcast and is the owner of the group-broadcast g...
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10.3.4.3 Group-broadcast group call procedure with an interworking group where the group-broadcast group is defined in the LMR system
3GPP TS 23.379 [7], subclause 10.6.2.5.2.1 describes the procedure for a group-broadcast group call within a single MCPTT system. The present procedure describes a group-broadcast group call that includes the IWF. In this procedure, the IWF is the owner of the group-broadcast group and is initiating the group-broadcas...
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10.3.4.4 Group-broadcast group call release with an interworking group procedure where the group-broadcast group is defined in the MCPTT system
When the call originator has completed transmitting, the group-broadcast group call is ended and the resources are released. Figure 10.3.4.4-1 illustrates the procedure for group-broadcast group call release (the group-broadcast group is defined in the MCPTT system). Pre-conditions: 1. An on-going group-broadcast gr...
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10.3.4.5 Group-broadcast group call release with an interworking group procedure where the group-broadcast group is defined in the LMR system
When the call originator has completed transmitting, the group-broadcast group call is ended and the resources are released. Figure 10.3.4.5-1 illustrates the procedure for group-broadcast group call release (the group-broadcast group defined in the LMR system). Pre-conditions: 1. An on-going group-broadcast group c...
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10.3.4.6 Broadcast group regroup call using pre-configured group
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10.3.4.6.1 General
The temporary group created using a pre-configured group can be a broadcast group or a non-broadcast group. A broadcast group regroup call using pre-configured groups can be achieved by first regrouping users into a pre-configured group regroup, making the broadcast group call on the pre-configured group, and then can...
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10.3.4.6.2 Broadcast group regroup call using pre-configured group the MCPTT system
The broadcast group regroup call procedure using pre-configured group allows an authorized MCPTT user to initiate a broadcast call to a set of MCPTT groups, which are regrouped only for the duration of the broadcast call. The regroup is cancelled at the end of the broadcast call to prevent users from talking back on th...
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10.3.4.6.3 Broadcast group regroup call using pre-configured group in the IWF
The broadcast group regroup call procedure using a pre-configured group allows an IWF user to initiate a broadcast call to a set of MCPTT groups, which are regrouped only for the duration of the broadcast call. Figure 10.3.4.6.3-1 illustrates the procedure to initiate a broadcast group regroup call using a pre-config...
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10.3.5 Chat group call
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10.3.5.1 General
This subclause is based upon subclause for chat group call in 3GPP TS 23.379 [7], subclause 10.6.2.3.1.2. For LMR systems that do not support the concept of chat groups, the IWF might still adapt its calls to the MCPTT chat model.
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10.3.5.2 MCPTT user initiated chat group call in an interworking group defined in LMR system
In this procedure, an MCPTT user initiates a chat group call in an interworking group defined in the LMR system. The signalling procedure is described in figure 10.3.5.2-1. Pre-conditions: 1. The interworking group information is known at the MCPTT server and the IWF by configuration or group creation. The interwork...
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10.3.5.3 LMR user initiated chat group call in an interworking group defined in MCPTT system
In this procedure, an LMR user initiates a chat group call in an interworking group defined in the MCPTT system. The signalling procedure is described in figure 10.3.5.3-1. Pre-conditions: 1. The interworking group information is known at the IWF by configuration. The interworking group has been defined in the MCPTT ...
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10.3.5.4 Release chat group call on an interworking group defined in the LMR system
This procedure describes the case where the LMR system releases an ongoing MCPTT chat group call on an interworking group defined in the LMR system, for all the participants of that group call. The signalling procedure is described in figure 10.3.5.4-1. Pre-conditions: 1. A chat group call is ongoing involving an MCP...
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10.3.5.5 Release chat group call on an interworking group defined in the MCPTT system
This procedure describes the case where the MCPTT server releases an ongoing MCPTT chat group call, on an interworking group defined in the MCPTT system, for all the participants of that group call, since at least one of the conditions for release are met e.g. due to hang time expiry, last participant leaving, second l...
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10.3.5.6 Void
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10.3.5.7 Void