51.021: Base Station System (BSS) equipment specification; Radio aspects

Info Page @ 3GPP
Rel-13
v13.1.0
Rel-12
v12.3.0
Rel-11
v11.4.0
Rel-10
v10.7.0
Rel-9
v9.10.0
Rel-8
v8.13.0
Rel-7
v7.10.0
Rel-6
v6.5.0
Rel-5
v5.6.0
Rel-4
v4.7.0