Hi there!
The positioning functionality provides a means to determine the geographic position and/or velocity of the UE based on measuring radio signals.
Positioning the UE involves two main steps:
The signal measurements may be made by the UE or the eNode B.
The standard positioning methods supported for E-UTRAN access are:
More information here: http://www.4g5gworld.com/sites/default/files/UE-pos-sig.JPG.
Details can be seen here: http://4g5gworld.com/blog/lte-ue-positioning-e-utran.