System and method for synchronizing companion electronic devices

• US 20070053341A1
• Filed: 09/06/2005
• Published: 03/08/2007
• Est. Priority Date: 09/06/2005
• Status: Abandoned Application

• Current Assignee: Timex Group BV (Tanager Group BV)
• Original Assignee: Timex Group BV (Tanager Group BV)
• Inventors: Lizzi, Ronald
• Application Number:
  US11/220,748
• Publication Number:
  US 20070053341A1
• Time in Patent Office: Days
• US Class Current: 370/350
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: H04J 3/0658 Clock or time synchronisation among packet nodes

Abstract

A method of establishing a communication link between a receiving device and a transmitting device from among a plurality of transmitting devices, wherein the preferred criterion for selection of the preferred transmitting device is based upon how long the particular transmitting device has been active.

Claims

1. A method of establishing a communication link between a receiving device and a transmitting device from among a plurality of transmitting devices, wherein each of the transmitting devices comprise a transmitter that respectively transmit packets of information, each packet of information comprising a value that is indicative of how long the particular transmitter device has been active, and wherein the receiving device receives transmitted packets of information from one or more of the transmitting devices and processes the respectively received values, wherein the method comprises the steps of:

receiving, during a first transmission period, a first packet of information transmitted from a first transmitting device;

receiving, during a later transmission period, a second packet of information from a transmitting device and determining from the value transmitted with the second packet of information whether the transmitting device has been active for no longer a period of time than the transmitting device from which the first packet of information was received during the first transmission period; and

if so, synchronizing the receiving device with the transmitting device that transmitted the second packet of information.

2. The method as claimed in claim 1, wherein the second packet of information is transmitted from the first transmitting device and the receiving device synchronizes with the first transmitting device.

8. The method as claimed in claim 1, wherein each packet of information comprises a count value, and wherein each successively transmitted packet of information from a particular transmitter has a count value that is greater than the count value associated with a previously transmitted packet of information from the particular transmitter, wherein the method comprises the steps of:

during the later transmission period, determining whether the count value transmitted with the second packet of information is less than or equal to an incremented value of the count value transmitted with the first packet of information; and

if so, synchronizing the receiving device with the transmitting device that transmitted the second packet of information.

3. A method of establishing a communication link between a receiving device and a transmitting device from among at least a first transmitting device and a second transmitting device, wherein each of the first and second transmitting devices comprise a transmitter that respectively transmit packets of information, each packet of information comprising a value that is indicative of how long the particular transmitting device has been active, and wherein the receiving device receives transmitted packets of information from at least the first and second transmitting devices and processes the respectively received values, wherein the method comprises the steps of:

receiving, during a first transmission period, a first packet of information transmitted from the first transmitting device and a first packet of information from the second transmitting device and maintaining the value associated with the transmitting device that has been active for the shortest period of time;

receiving, during a later transmission period, a packet of information from one or more transmitting devices; and

determining, from the respective values transmitted with the packets of information from the one or more transmitting devices during the later transmission period, which transmitting device from those transmitting devices for which packets of information have been received and processed, has been active for the shortest period of time; and

synchronizing the receiving device with the transmitting device that transmitted the packet of information with the value indicative of having been active for the shortest period of time.

4. The method as claimed in claim 3, wherein it is the second transmitting device that transmitted, during the later transmission period, the packet of information with the value indicative of having been active for the shortest period of time.

5. The method as claimed in claim 3, wherein it is the first transmitting device that transmitted, during the later transmission period, the packet of information with the value indicative of having been active for the shortest period of time.

6. The method as claimed in claim 3, including the step of inhibiting the synchronization of the receiving device with any transmitting device that has a respective value indicative of a transmitting device that has been active for longer than the transmitting device determined to have been active for the shortest period of time.

7. The method as claimed in claim 3, wherein the later transmission period is a subsequent transmission period to the first transmission period.

9. The method as claimed in claim 3, wherein each packet of information transmitted by a transmitting device comprises a count value and wherein each successively transmitted packet of information from the transmitter of a transmitting device has a count value that is greater than the count value associated with a previously transmitted packet of information from the respective transmitting device, wherein the method comprises the steps of:

during the first transmission period, maintaining the lowest count value determined from the count value associated with the first packet of information transmitted from the first transmitting device and the first packet of information transmitted from the second transmitting device; and

determining whether the count value transmitted with the packet of information from the transmitting device during the later transmission period is less than or equal to an incremented value of the maintained count value; and

if so, synchronizing the receiving device with the transmitting device that transmitted the packet of information during the later transmission period.

10. The method as claimed in claim 9, wherein during the later transmission period, if the receiving device processes a second packet of information transmitted by the first transmitting device and determines that the count value associated with the second packet of information is greater than the incremented value of the maintained count value, then the method comprises the steps of:

processing a second packet of information transmitted by the second transmitting device and determining whether the count value associated with the second packet of information from the second transmitting device is lower than or equal to the incremented value of the maintained count value; and

if so, synchronizing the receiving device with the second transmitting device.

11. The method as claimed in claim 9, wherein during the later transmission period, if the receiving device processes a second packet of information transmitted by the first transmitting device and determines that the count value associated with the second packet of information is less than or equal to the incremented value of the maintained count value, then the method comprises the steps of:

synchronizing the receiving device with the first transmitting device.

12. The method as claimed in claim 9, wherein during the later transmission period, if the receiving device does not process a packet of information having a count value less than or equal to the incremented value of the maintained count value, then the method comprises the steps of:

inhibiting the synchronization of the receiving device with either of the first or second transmitting device during the later transmission period.

13. The method as claimed in claim 9, including the step of inhibiting the synchronization of the receiving device with any transmitting device that has a respective count value indicative of a transmitting device that has been active for longer than the transmitting device determined to have been active for the shortest period of time.

14. The method as claimed in claim 9, wherein the later transmission period is a subsequent transmission period to the first transmission period.

15. A method of establishing a communication link between a receiving device and a transmitting device from among a first transmitting device and at least a second transmitting device, wherein each of the transmitting devices comprise a transmitter that respectively transmit packets of information, each packet of information comprising a value that is indicative of how long the particular transmitter device has been active, and wherein the receiving device receives transmitted packets of information from at least the first and second transmitting devices and processes the respectively received values, wherein the method comprises the steps of:

receiving respective first packets of information transmitted from the first and at least second transmitting devices;

determining from the values transmitted with the respective first packets of information which transmitting device has been active for the shortest period of time; and

maintaining synchronization of the receiving device with the transmitting device determined to have been active for the shortest period of time.

16. The method as claimed in claim 15, including the steps of:

receiving, during a predetermined transmission period, a first packet of information transmitted from the first transmitting device;

receiving, but prior to receiving a second packet of information from the first transmitting device, a first packet of information from the second transmitting device and determining that the second transmitter has been active for a shorter period of time than the first transmitting device;

determining that no other packets of information received prior to receiving a second packet of information from the second transmitting device has a value indicative of a transmitting device having been active for a shorter period of time than the second transmitting device; and

maintaining synchronization of the receiving device with the second transmitting device.

17. The method as claimed in claim 15, including the steps of:

receiving, during a predetermined transmission period, a first packet of information transmitted from the first transmitting device;

receiving, but prior to receiving a second packet of information from the first transmitting device, a first packet of information from the second transmitting device and determining that the second transmitter has been active for a period of time longer than the first transmitting device;

determining that no other packets of information received prior to receiving a second packet of information from the first transmitting device has a value indicative of a transmitting device having been active for a shorter period of time than the first transmitting device; and

maintaining synchronization of the receiving device with the first transmitting device.

18. The method as claimed in claim 15, including the steps of:

receiving, during a predetermined transmission period, a first packet of information transmitted from the first transmitting device;

receiving, but prior to receiving a second packet of information from the first transmitting device, a first packet of information from the second transmitting device and determining that the second transmitter has been active for a shorter period of time than the first transmitting device;

receiving, but prior to receiving a second packet of information from the second transmitting device, a first packet of information from a third transmitting device and determining if the third transmitter has been active for a shorter period of time than the second transmitting device; and

if so

determining that no other packets of information received prior to receiving a second packet of information from the third transmitting device has a value indicative of a transmitting device having been active for a shorter period of time than the third transmitting device; and

maintaining synchronization of the receiving device with the third transmitting device.

19. The method as claimed in claim 15, wherein the maintaining of synchronization comprises the steps of starting the synchronization timer to be ready to receive subsequent packets of information from the transmitting device having been determined to be active for the shortest period of time.

20. The method as claimed in claim 15, including the step of synchronizing the receiving device with the transmitting device that has been active for the shortest period of time.

21. The method as claimed in claim 20, wherein the synchronization step is initiated after each determination that a value associated with a packet of information from a transmitting device is indicative of that transmitting device having been active for the shortest amount of time.