A group two-way radio system for providing temporarily emergently expanding communication range as a portable dispatch system with no available signal repeater involved

摘要

#$%^&*AU2013270562B120150416.pdf#####ABSTRACT A portable or vehicle radio of a two-way radio system for use by a group is generally in direct call mode as a generic radio. Once a communication range is needed to be expanded under a condition of no available repeater, a group commander is able to designate a two-way radio most suitable for functioning as a signal repeater according to GPS location through over-the-air programming or manual control to expand the communication range. The signal repeater retransmits signals being received through time division multiple access (TDMA) over a same channel at different time slots that provides a function of expanding a communication range as a conventional dual-band repeater transmitting signals over uplink and downlink bands does. Therefore, the present invention as a generic radio, so as to become a mobile disposal system for providing temporary, emergent and expanded communication range when an emergency is occurred. 18