name: GMS
full_form: Group Management Server
context: and is signed using the identity of the primary GMS. 2) The MCPTT UEs acknowledge the notification. 3) The primary GMS then notifies the partner GMS of the group regroup operation (Step 9 of clause 10.6.2.2 in TS 23.179). Within this message, the primary GMS includes a Group Key Transport payload following the procedures in clause 7.4.1, treating the partner GMS as another user within the group. Accordingly, the payload encrypts the new GMK to the identity of the partner GMS and is signed using the identity of the primary GMS. The GUK-ID is derived using the User Salt generated from the partner GMS's URI. 4) The partner GMS extracts the GMK and GMK-ID from the notification. The partner GMS then notifies the affiliated users within the partner MCPTT system (Step 11 of clause 10.6.2.2 in TS 23.179). The partner GMS re-encrypts the GMK to the identity of the affiliated users in the partner system, generates new GUK-IDs for each user and signs using its identity (the identity of the
description: The Group Management Server (GMS) manages group communications within the MCPTT (Mission Critical Push To Talk) system. It handles tasks like group regrouping, key management, and notifying partner GMS and affiliated users.
explanation: The GMS performs essential network-level functions such as managing groups, handling security keys, and communicating with other network elements, classifying it as a Network Function.
section_title: 7.4.5.3 	Group regrouping procedures (involving multiple MCPTT systems)
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biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O