Mission Critical Push to Talk Identity

In Release 15, key enhancements for the MCPTT Identity function included the formal description of the MC system identity and the introduction of functional alias management for MCPTT servers, distinguishing between the server serving the user and the server owning the alias. The release also defined the MCPTT-3 identity and introduced procedures for MCPTT unicast media flow stop and resume, alongside updates for managing group calls like Imminent Peril calls. Furthermore, it enabled the configuration of Mission Critical Services access identities, such as Access Identity 2 for MCS, directly via the USIM.

• FEC for mission critical services TS 23.280CR0043
• Description of MC system identity TS 23.280CR0138
• MCPTT unicast media flow stop and resume TS 23.379CR0044
• Functional model for MCPTT interconnection TS 23.379CR0079
• MCPTT specific group configuration for interconnection TS 23.379CR0114
• Definition of MCPTT-3 TS 23.379CR0119

+ 39 more changes

In Release 16, key enhancements for MCPTT Identity included new configuration and procedures for functional alias management, such as automatic activation and deactivation based on location and user configuration for information queries. The release also introduced call forwarding for MCPTT private calls and added the ability for the server to provide a list of MCPTT group members who did not acknowledge a group call request. Furthermore, support was added for limiting the number of simultaneous authorized clients per user and for "Multi-Device" and "Multi-Identity" services.

• Move interworking of functional alias from MCPTT to MCCoRe TS, MCPTT part TS 22.179CR0068
• Move interworking of functional alias from MCPTT to MCCoRe TS, MCCoRe part TS 22.280CR0094
• Provide list of MCPTT group members who did not acknowledge the group call request TS 23.379CR0191
• User configuration for functional alias information query for MCPTT TS 23.379CR0195
• MCPTT configuration for implicit functional alias activation/deactivation TS 23.379CR0203
• Add configuration for call forwarding for MCPTT private calls TS 23.379CR0210

+ 39 more changes

In Release 17, key enhancements for MCPTT included the introduction of call transfer, announced call redirection, and call forwarding based on manual input for MCPTT private calls, including the ability to use functional aliases as targets. The release also added significant interconnect capabilities, defining procedures for the MCPTT Gateway Server and for pre-arranged groups, affiliation, chat groups, and remote operations. Furthermore, it enriched the MCPTT location XML schema with altitude, timestamp, and accuracy data and introduced interworking for MCPTT group calls with GSM-R.

• Add enhancements for interworking of MCPTT group calls with GSM-R TS 23.283CR0049
• Support of functional aliases as called party address in MCPTT emergency private calls TS 23.379CR0225
• Add call transfer for MCPTT private calls TS 23.379CR0229
• Add announced call redirection for MCPTT private calls TS 23.379CR0246
• Add call forwarding based on manual input for MCPTT private calls TS 23.379CR0247
• Add call forwarding based on manual input for MCPTT private calls TS 23.379CR0249

+ 71 more changes

In Release 18, the MCPTT function introduced enhanced procedures for ad hoc group calls, including their creation, modification of participant lists during an ongoing call, and support for emergency alerts within such groups, even across multiple MCPTT systems. It also added new capabilities for private call forwarding and transfer between different MCPTT systems, and expanded regrouping support with features like preconfigured regrouping and the use of an MCPTT group ID for regroup calls. Furthermore, the release included user-configurable location privacy controls and enabled automatic affiliation to a group for remotely initiated call requests.

• Sharing administrative configuration between Mission Critical Organizations (SACI_MCS) TS 22.280CR0146
• Preconfigured regrouping support for MCPTT TS 23.280CR0366
• Allow the user to restrict the dissemination of the location information – MCPTT Configuration TS 23.379CR0308
• Auto affiliate to MCPTT group for remotely initiated MCPTT call request procedure TS 23.379CR0309
• Private call forwarding between several MCPTT systems TS 23.379CR0310
• Private call transfer between several MCPTT systems TS 23.379CR0313

+ 104 more changes

In Release 19, enhancements to MCPTT focused on dynamic ad hoc group call management, allowing authorized users to modify the list of participants by changing the setup criteria during an ongoing call, even across multiple MC systems. The release also introduced the ability for an authorized user to release an ad hoc group call and added configuration for authorizing modifications to emergency alert participants within such groups. Furthermore, it provided new support for user plane and control plane separation, target user configuration for recording, and specified a reason for leaving a session.

• UE-to-UE Multi-hop relay requirements for mission critical communications TS 22.280CR0160
• Clarifications on temporary and pre-arranged MCPTT broadcast groups TS 23.379CR0357
• Modify list of participants by changing the criteria during an ongoing MCPTT ad hoc group call (single MC system) TS 23.379CR0360
• Changing the criteria during an ongoing MCPTT ad hoc group call (multiple MC systems) TS 23.379CR0372
• Configuration for authorising modification of ad hoc group emergency alert participants - mcptt TS 23.379CR0391
• Adhoc group call release by an authorized user (MCPTT) TS 23.379CR0402

+ 44 more changes

In Release 20, the MCPTT function introduced new procedures for call forwarding specifically for Ad hoc Group calls, both within a single MCPTT system and when involving multiple MCPTT systems. It also added support for interworking with ad hoc group emergency alerts initiated by a user and allowed configurations to enable preconfigured ad hoc group regroup. Furthermore, the release provided authorisation mechanisms for a client to request its connection quality and included clarifications and corrections to server-to-server messaging and terminology.

• Interworking support for ad hoc group emergency alerts (MCPTT user initiated) TS 23.283CR0091
• Call forwarding for Ad hoc Group calls single MCPTT system (procedures) TS 23.379CR0489
• Call forwarding for Ad hoc Group calls involving multiple MCPTT systems (procedures) TS 23.379CR0490
• Configurations update to allow preconfigured ad hoc group regroup for MCPTT TS 23.379CR0519
• Authorisation to request quality of connection of MCPTT client TS 23.379CR0520
• Resolving Editor’s Notes on server-to-server messages (MCPTT) information flows TS 23.379CR0503

+ 2 more changes