This work studies the improvement in
service coverage obtained by three different ways of
hybridising (terrestrial and satellite) triangulation
location methods for cellular networks. Though the
authors assume that terrestrial cellular networks
use Enhanced Observed Time Difference (E-OTD)
in 2G or Observed Time Difference Of Arrival
(OTDOA) in 3G, and that the satellite GNSS uses
Assisted Global Positioning System (A-GPS), their
analysis can easily be generalized to address any
other triangulation method. A simple analytical
model is presented, which is used for evaluating the
service coverage of each approach. The numerical
results show how hybridisation leads to a high
improvement and an easy balance between traffic
and geographical coverage.Peer Reviewe
