Patent ID: 8228826
Filing Date: 2012-07-24
Classification: H04B,H04W

Abstract:
1. A method for call setup in an asynchronous frequency hopping digital two-way communication system, the method comprising: transmitting in immediately adjacent time slots, by a caller device to one or more target devices, a first pair of slots including (i) a first preamble slot, in a set of one or more preamble slots, over a first unique fixed frequency selected from a frequency hopset and (ii) a first synchronization slot, in a set of one or more synchronization slots, over a second unique fixed frequency selected from the frequency hopset in adjacent time slots; waiting, by the caller device, a predetermined amount of time to receive an acknowledgement signal from the one or more target devices in response to transmitting the first preamble slot and the first synchronization slot; transmitting in immediately adjacent time slots, by the caller device to the one or more target devices, a second pair of slots including (i) a second preamble slot in the set of one or more preamble slots over a third unique fixed frequency selected from the frequency hopset and (ii) a second synchronization slot in the set of one or more synchronization slots over a fourth unique fixed frequency selected from the frequency hopset; waiting, by the caller device, the predetermined amount of time to receive second acknowledgement signal from the one or more target devices in response to transmitting the second preamble slot and the second synchronization slot; transmitting, by the caller device to the one or more target devices, a third pair of slots including (i) a third preamble slot in the set of one or more preamble slots over a fifth unique fixed frequency selected from the frequency hopset and (ii) a third synchronization slot in the set of one or more synchronization slots over a sixth unique fixed frequency selected from the frequency hopset in immediately adjacent time slots; waiting, by the caller device, the predetermined amount of time to receive a third acknowledgement signal from the one or more target devices in response to transmitting the third preamble slot and the third synchronization slot; establishing, by the caller device, the data communication link between the caller device and the one or more target devices over at least one random frequency selected from the frequency hopset, in response to receiving at least one of the first, second, and third acknowledgement signals from the one or more target devices.