According to embodiments of the invention, user equipment (UE) performs
inter-radio access technology (RAT) neighbour cell measurements during an
idle mode of the UE. The inter-RAT measurement results may be stored in
an internal memory of the UE during the Idle mode. When the UE initiates
a connection setup, an inter-RAT measurement report containing inter-RAT
measurement results obtained during the idle mode is sent to the network
at the connection setup. Consequently, the inter-RAT measurement
information is immediately available for a network decision at the
beginning of the connected mode. For example, an inter-RAT handover can
be decided and performed without a delay, based on the inter-RAT
measurements made in advance during the idle mode and reported at the
connection setup.