Patent ID: 6243583
Filing Date: 2001-06-05
Classification: H04M,H04W

Abstract:
A communication system for switching a connection destination of a slave from a first master to a second master, wherein:said first master connects a first upward link from said slave by using a first time slot on one of a plurality of frequencies;said slave transmits a switch signal when said slave detects that a reception level at said slave is less than a predetermined level;said first master informs said slave of a second time slot on said one of the plurality of frequencies used for connection between said first master and said slave;said first master disconnects the first upward link from said slave; andsaid second master connects a second upward link from said slave, without connecting a downward link to said slave, in response to the switch signal received by said first master and a first upward link signal received by said second master, by using the second time slot, before said first master disconnects the first upward link from said slave,wherein said second master is informed by said first master in response to the switch signal about said one of the plurality of frequencies used for connection between said first master and said slave, and the first upward link and the second upward link are used for speech communication.