Trunking radio system with frequency diversity

摘要

This invention relates to a trunking radio system (FIG. 1) having a central station and at least one remote station for communication with the central station over a number of frequency-divided radio channels. The central station has a transmitter (10) for transmitting a number of signals to different remote units on different channels and a trunking controller (12) for allocating channels to different remote units. The trunking controller monitors the excess number of channels over the number of channels allocated to remote units. The central controller signals to a remote unit to allocate a channel to the remote unit when there is at least one excess channel. Signals received from the remote unit over the at least two channels are diversity combined (21). The remote unit has a receiver for receiving signalling from the central station and a diversity transmitter (34, 35, 39) responsive to the signalling for transmitting a signal over the at least two channels. The invention also relates to a central station and a remote unit per se.