Patent ID: 7259671
Filing Date: 2007-08-21
Classification: G08B

Abstract:
1. A method for detecting when a first mobile transceiver unit has moved a predetermined distance from a second mobile transceiver unit, the second mobile transceiver unit including a controller having a processor and a memory coupled to the processor, the method comprising: establishing a communication between the second mobile transceiver unit and at least one first mobile transceiver unit; providing a first indication indicating successful communication establishment between the second mobile transceiver unit and the at least one first mobile transceiver unit; transmitting a periodic request for a first identification to the at least one first mobile transceiver unit, the first identification providing an identity of the at least one first mobile transceiver unit; and providing a second indication if a response to the periodic request for the first identification is not detected by the second mobile transceiver unit within a pre-selected time, the second indication indicating that the at least one first mobile transceiver unit has moved the predetermined distance from the second mobile transceiver unit; detecting actuation of a first button of the second mobile transceiver unit, actuation of the first button enabling power to the second mobile transceiver unit; detecting actuation of a second button of the second mobile transceiver unit after detecting actuation of the first button, actuation of the second button enabling establishment of the communication; wherein establishing the communication comprises establishing a monitoring piconet, the monitoring piconet including Bluetooth enabled RF links between the second mobile transceiver unit and the at least one first mobile transceiver unit; and wherein establishing the monitoring piconet comprises: causing an inquiry command to be transmitted in response to detecting actuation of the second button; detecting receipt of a first data packet, the first data packet including the first identification and a first radio frequency operational parameter of the at least one first mobile transceiver unit; causing a page command to be transmitted in response to detecting receipt of the first data packet, the page command including the first identification of the at least one first mobile transceiver unit; detecting receipt of a second data packet transmitted in response to receipt of the page command, the second data packet including the first identification of the at least one first mobile transceiver unit; causing a third data packet to be transmitted in response to detecting receipt of the second data packet, the third data packet including a second identification and a second radio frequency operational parameter of the second mobile transceiver unit; detecting receipt of a fourth data packet transmitted in response to receipt of the third data packet, the fourth data packet including the first identification of the at least one first mobile transceiver unit and indicating that the first radio frequency operational parameter has been replaced by the second radio frequency operational parameter; and causing a monitoring piconet address of the monitoring piconet to be assigned to the first mobile transceiver unit.