In a distributed communication system such as a personal handyphone system, when a new call must be connected through a cell station, the controller associated with the cell station checks to see if the cell station is fully loaded. If so, the controller issues a zone report request to portable telephones...http://www.google.de/patents/US6148210?utm_source=gb-gplus-sharePatent US6148210 - Personal communication system and technique with zone report feature
