Evolution of Positioning Techniques in Cellular Networks, from 2G to 4G

Figure 9

(a) OTDOA-PE positioning scenario, with one single-cell Node B and three geographically dispersed PEs, all placed at known coordinates. Note that , = 1, 2, 3, and 4, indicate the distance between and the UE and that , = 1, 2, 3, and 4, indicate the distance between and Node B; is the distance between Node B and the UE. (b) Timeline of the OTDOA-PE positioning scenario, assuming LOS between all elements.

(a)

(b)