36.455: Evolved Universal Terrestrial Radio Access (E-UTRA); LTE Positioning Protocol A (LPPa)

Info Page @ 3GPP
Rel-13
v13.1.0
Rel-12
v12.2.0
v12.1.0
Rel-11
v11.3.0
Rel-10
v10.4.0
Rel-9
v9.4.1