Patent ID: 7536194

Claim:
A method of synchronizing a first device and a second device, comprising: generating a first tone by the first device, the first tone one of (a) including an identity of the second device and (b) generated at a predefined time; receiving the first tone by the second device; setting a clock of the second device based on the received first tone; sending an acknowledgment by the second device to the first device; (i) waiting for a predefined period of time by the second device for an indication of acknowledged receipt of the acknowledgement; (ii) waking up in a subsequent supervision time slot to receive the indication of acknowledged receipt of the acknowledgement if the indication is not received within the predefined period of time; repeating steps (i) and (ii) for a predefined number of times; and transmitting a poll by the second device to the first device if the indication of acknowledged receipt is not received.