DIGITAL MOBILE TELEPHONE SYSTEM HAVING OVERLAY CONFIGURATION.

摘要

The transmission field strengths of the sectoral region from a base station and an overlay region are measured respectively by a mobile terminal communicating a base station and the measured results are reported to an exchange. When the measured field strength exceeds a predetermined threshold, the exchange changes over the frequency of the communication between the base station and the mobile terminal into the communication frequency of the overlay region. When the measured field strength is lower than the predetermined threshold, the exchange changes over the communication frequency into the communication frequency of the sectoral region.