Method and system for discovery and transparent status reporting for sensor networks

• US 9,007,181 B2
• Filed: 01/08/2010
• Issued: 04/14/2015
• Est. Priority Date: 01/08/2010
• Status: Active Grant

• Current Assignee: Sensormatic Electronics LLC (Johnson Controls International plc)
• Original Assignee: Tyco Fire & Security GmbH (Johnson Controls International plc)
• Inventors: Alicot, Jorge F., Relihan, Timothy J.
• Primary Examiner(s): Mehmood, Jennifer
• Assistant Examiner(s): POINT, RUFUS C
• Application Number:
  US12/684,402
• Publication Number:
  US 20110169612A1
• Time in Patent Office: 1,922 Days
• Field of Search: 340/572.1, 340/539.1, 340/539.3, 340/506, 340/568.1, 340/3.51, 340/539.26, 700/28, 700/286, 700/204, 700/205, 370/232, 709/206, 709/207
• US Class Current: 340/10.4
• CPC Class Codes: G06K 7/10009 sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
• CPC Class Codes: G08B 13/2462 Asset location systems combined with EAS inventory, tracking, logistic G06Q10/00; entrance control systems G07C9/00

Abstract

A system and method for monitoring the status of wireless node devices in a network. A network controller polls one or more sensor devices for status information. The sensor devices are in communication with at least one wireless node device. More than one sensor device may be associated with a single wireless node device. The wireless node device appends its own status information to the transmission frame of the sensor device'"'"'s response message, and the transmission frame, containing the address and status information for both the sensor device and the wireless node device, is transmitted to the network controller. The inclusion of the wireless node device address and status information is done without the knowledge of the sensor device.

Claims

1. A method of monitoring wireless node devices in an electronic article surveillance (“

EAS”

) system, the method comprising;

polling at least one sensor device in communication with at least one wireless node device for status information, the polling configured to cause the at least one sensor device to transmit a response message having a transmission frame structure including a plurality of fields corresponding to a first communication layer and a second communication layer different from the first communication layer, the response message including sensor status information generated by the at least one sensor node;

receiving a modified response message, the modified response message containing at least one additional field embedded within the plurality of fields of the response message, the at least one additional field including wireless node status information and corresponding to a third communication layer different from the first and second communication layers; and

extracting the wireless node status information from the modified response message.

2. The method of claim 1, further comprising populating a routing table with wireless node device addresses and sensor device addresses associated with a corresponding wireless node device.

3. The method of claim 2, wherein the routing table includes the current status of each sensor device and the current status of each associated wireless node device.

4. The method of claim 2, further comprising assessing the status of a wireless node device by directing a status command directly to the wireless node device.

5. The method of claim 2, wherein the address of a wireless node device is associated with addresses of more than one sensor device.

6. A wireless node device in an electronic article surveillance (“

EAS”

) system, the wireless node device being in communication with at least one sensor device, the wireless node device comprising;

a wireless transmitter;

a receiver configured to receive a response message from the at least one sensor device, the response message having a transmission frame structure including a plurality of fields corresponding to a first communication layer and a second communication layer different from the first communication layer; and

a processor in communication with the receiver and the wireless transmitter, the processor configured to;

embed at least one additional field within the plurality of fields of the response message, the at least one additional field including wireless node device status information and corresponding to a third communication layer different from the first and second communication layers; and

send the response message with the embedded wireless node device status information to the wireless transmitter.

7. The device of claim 6, wherein the processor determines when a status response message is being transmitted by the at least one sensor device.

8. The device of claim 7, wherein the processor determines when a status response message is being transmitted by the at least one sensor device by decoding a command field of the response message.

9. The device of claim 6, wherein the response message with the embedded wireless node device status information includes the transmission frame structure of the response message received from the at least one sensor device, the at least one additional field and plurality of fields configured to contain information introduced by different communication layers of the EAS system.

10. The device of claim 6, wherein the receiver further receives status inquiries from a network controller.

19. The device of claim 6, wherein the transmission frame structure of the response message received from the at least one sensor device includes a preamble, the preamble remaining unmodified after the embedding of wireless node device status information.

11. A method of supplying wireless node device status information from a wireless node device to a network controller in an electronic article surveillance (“

EAS’

) system, the method comprising;

establishing communication with at least one sensor device;

receiving a response message from the sensor device, the response message having a transmission frame structure including a plurality of fields corresponding to a first communication layer and a second communication layer different from the first communication layer;

embedding at least one additional field within the plurality of fields of the transmission frame structure of the response message received from the sensor device, the at least one additional field including wireless node device status information and corresponding to a third communication layer different from the first and second communication layers; and

transmitting the response message with the embedded wireless node device status information to the network controller.

12. The method of claim 11, further comprising determining when the at least one sensor device transmits the response message.

13. The method of claim 12, wherein determining when the at least one sensor device transmits the response message includes decoding a command field of the response message.

14. The method of claim 11, wherein the transmission frame structure of the response message received from the sensor device includes a preamble, the preamble remaining unmodified after the embedding of wireless node device status information.

15. The method of claim 11, wherein embedding wireless node status information within the transmission frame structure includes increasing the amount of fields of the transmission frame.

16. The method of claim 11, wherein the wireless node device and the at least one sensor device are housed in a single unit.

17. The method of claim 11, wherein the wireless node device status information includes an address of the wireless node device.

18. The method of claim 17, wherein the address of the wireless node device is associated with an address of more than one sensor device.