Technical Specification Group working methods

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TS 21.900 defines the operational working methods for 3GPP Technical Specification Groups (TSGs), their Working Groups, and Sub-Groups, along with the 3GPP Support Team. It specifically governs document management activities: specification handling, updating procedures, Change Request (CR) procedures, version control mechanisms, and specification status tracking. It complements existing 3GPP rules but explicitly excludes the internal working details of TSG Sub-Groups. Responsibility delegation from a TSG to a Working Group is acknowledged, with the practical understanding that a Sub-Group may execute the actual work. A RAN or core engineer would open TS 21.900 when needing to correctly submit or process a Change Request against an existing specification, understand version numbering and specification status conventions, or determine the correct procedural steps for advancing a work item through a Working Group. It is also the reference when questions arise about document management obligations — for example, confirming who carries formal responsibility for a deliverable or how updating procedures flow between a TSG and its subordinate Working Groups.

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