METHOD AND APPARATUS FOR MONITORING LINK ACTIVITY TO PREVENT SYSTEM DEADLOCK IN A DISPATCH SYSTEM

摘要

PURPOSE: An apparatus relates to the processor of dispatch system in the cellular system. A method is provided to prevent system deadlock in a dispatch system by monitoring link activity, as a set of remote units are communicated with each other by broadcasting one at a time to the group. CONSTITUTION: A communications manager(40) can grant the right of using of system talker when the user of remote units push to talk button. The voice signal of recote units is brosdcasted to other remote units when the remote units have the right of using of system talker. A communications manager (40) grants a remote unit (10) to be the exclusive system talker upon request through the base station servicing the requesting remote unit (44). The base station (44) monitors a series of data from the remote unit designated as the system talker (10) to detect voice activity. The base station (44) sends a surrogate request to the communications manager (40) to relinquish the system talker privilege if the voice activity falls below a predetermined threshold.