
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 5G; Technical Specification Group working methods (3GPP TR 21.900 version 19.1.0 Release 19)
NORMA vydána dne 22.1.2026
Designation standards: ETSI TR 121900-V19.1.0
Publication date standards: 22.1.2026
The number of pages: 45
Approximate weight : 135 g (0.30 lbs)
Country: European technical standard
Kategorie: Technické normy ETSI