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ETSI TR 121900-V19.1.0
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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)
Standard published on 22.1.2026
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ETSI TR 121900-V3.2.0
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Universal Mobile Telecommunications System (UMTS); Working methods (3G TR 21.900 version 3.2.0 Release 1999)
Standard published on 28.1.2000
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ETSI TR 121900-V3.3.0
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Universal Mobile Telecommunications System (UMTS); Working methods (3G TR 21.900 version 3.3.0 Release 1999)
Standard published on 22.6.2000
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ETSI TR 121900-V3.4.0
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Universal Mobile Telecommunications System (UMTS); Working Methods (3GPP TR 21.900 version 3.4.0 Release 1999)
Standard published on 30.9.2000
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ETSI TR 121900-V3.5.0
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Universal Mobile Telecommunications System (UMTS); Working methods (3GPP TR 21.900 version 3.5.0 Release 1999)
Standard published on 31.12.2000
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ETSI TR 121900-V3.6.0
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Universal Mobile Telecommunications System (UMTS); Technical Specification Group working methods (3GPP TR 21.900 version 3.6.0 Release 1999)
Standard published on 31.3.2001
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ETSI TR 121900-V3.7.0
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Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Technical Specification Group working methods (3GPP TR 21.900 version 3.7.0 Release 1999)
Standard published on 31.12.2003
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ETSI TR 121900-V4.0.0
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Universal Mobile Telecommunications System (UMTS); Technical Specification Group working methods (3GPP TR 21.900 version 4.0.0 Release 4)
Standard published on 31.3.2001
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ETSI TR 121900-V4.1.0
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Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Technical Specification Group working methods (3GPP TR 21.900 version 4.1.0 Release 4)
Standard published on 31.12.2003
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ETSI TR 121900-V5.0.1
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Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Technical Specification Group working methods (3GPP TR 21.900 version 5.0.1 Release 5)
Standard published on 30.9.2002
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