23.221: Architectural requirements

Info Page @ 3GPP
Rel-13
v13.0.0
Rel-12
v12.0.0
Rel-11
v11.3.0
Rel-10
v10.3.0
Rel-9
v9.5.0
Rel-8
v8.9.0
Rel-7
v7.2.0
Rel-6
v6.3.0
Rel-5
v5.11.0
Rel-4
v4.2.0