Patent ID: 8675614

Claim:
A method performed by a base station of a trunking site within a trunked radio system, the method comprising: receiving, at the base station, a first base station control packet from an infrastructure controller over a network; in response to receiving the first base station control packet, the base station transmitting a corresponding first subscriber control packet over a subscriber control channel at a first transmission time that is determined based on a transmission schedule, wherein the first subscriber control packet includes a frame sync, a network ID, and a payload based on the first base station control packet; determining, by the base station, that a second base station control packet has not been received from the infrastructure controller over the network within a threshold period of time from a time at which the first base station control packet was received; and in response to determining that the second base station control packet has not been received before the first timeout, the base station generating and transmitting a pre-determined subscriber control packet, configured to cause subscriber radios receiving the pre-determined subscriber control packet to delay abandonment of the subscriber control channel, over the subscriber control channel at a second transmission time that is determined based on the transmission schedule.