A base station (28) included in a radio access network of a
telecommunications system has two diversity antennas (44A, 44B) for a
cell/carrier utilized in a sector served by the base station which are
respectively involved in transmission of two branches of a radio link
signal of the cell/carrier between the base station and a user equipment
unit (30). Two branches of signal processing hardware respectively
process the two branches of the radio link signal to yield two respective
processed branches of the radio link signal. A rake receiver (62, 262)
measures the delay difference between the two processed branches of the
radio link signal, and uses the measured delay difference for various
purposes. For example, some embodiments of the invention use the delay
difference between the two branches as measured by the rake receiver to
compensate for a delay difference which exists between the two processed
branches of the radio link signal. When measuring the delay difference
between the two branches of an uplink radio signal, a rake receiver (62)
at the radio base station is employed. On the other hand, when measuring
the delay difference between the two branches of a downlink radio signal,
a rake receiver (262) at test user equipment unit (30T) is employed.