An intelligent mobile radio unit is served by one of a network of macrocells and microcells. The unit is arranged to monitor, for example, the signal strength or bit error ratio of signals transmitted from each of a set of candidate base stations of cells surrounding the serving base based on the assessment...http://www.google.de/patents/US5491834?utm_source=gb-gplus-sharePatent US5491834 - Mobile radio handover initiation determination
