The power of a first signal is measured and is compared with a threshold. If the first signal power meets a handoff threshold, the system enters the handoff procedure. Once in the handoff procedure, estimates of a first signal quality a signal would have, if transmitted from the first site to the subscriber,...http://www.google.de/patents/US5548808?utm_source=gb-gplus-sharePatent US5548808 - Method for performing a handoff in a communication system
