In a cellular radio system including a plurality of cells (e.g. cell sectors or micro cells) (4, 5, 8, 9, 10, 11) each normally using a respective channel for interference reduction purposes, a number of the cells are arranged in groups (6) and in the event of a cell associated with equipment moving...http://www.google.de/patents/US5265263?utm_source=gb-gplus-sharePatent US5265263 - Handover techniques
