Wireless system gateway cache

• US 8,520,588 B2
• Filed: 02/01/2008
• Issued: 08/27/2013
• Est. Priority Date: 02/01/2008
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Pulini, Christopher F., Chernoguzov, Alexander
• Primary Examiner(s): JAIN, RAJ K
• Application Number:
  US12/024,702
• Publication Number:
  US 20090196218A1
• Time in Patent Office: 2,034 Days
• Field of Search: 370/328
• US Class Current: 370/328
• CPC Class Codes: H04L 41/00 Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: Y04S 40/18 Network protocols supporting networked applications, e.g. including control of end-device applications over a network

Abstract

A wireless system gateway cache is presented. The gateway includes a first, wireless interface, a second interface, and a cache controller. The cache controller receives a characteristic of a parameter of a first device. The cache controller also receives a value of the parameter from the first device via the first interface and stores the value according to the characteristic of the parameter. The cache controller further receives a request for the value of the parameter from a second device via the second interface and sends the stored value to the second device in response to the request.

Claims

1. A method comprising:

receiving in a gateway a classification of a parameter of a first device in wireless communication with the gateway, the classification being one of;

dynamic, static, constant, and volatile;

storing in the gateway a value of the parameter for an amount of time that is based on the classification of the parameter;

receiving a request for the value of the parameter from a second device; and

sending the stored value to the second device in response to the request.

2. The method of claim 1, wherein the sending of the stored value to the second device is performed only if a state of the parameter has a value associated with a valid parameter, wherein the value of the state of the parameter is one of:

clean, refreshing, cleaning, dirty, or write in progress.

3. The method of claim 1, further comprising:

sending a read command to the first device; and

receiving the value of the parameter from the first device, wherein the value is received from the first device in response to the read command.

4. The method of claim 3, wherein the read command is sent repeatedly at a predetermined time interval according to the classification of the parameter.

5. The method of claim 3, further comprising receiving in the gateway a value of a second parameter of the first device, wherein the read command is sent in response to receiving the value of the second parameter.

6. The method of claim 3, further comprising:

receiving a write value for the parameter from the second device; and

sending a write command to the first device to set the parameter to the write value, wherein the read command is sent in response to completion of sending the write command.

7. The method of claim 1, further comprising removing the stored value of the parameter from the gateway after the amount of time elapses.

8. A device comprising:

a first interface, wherein the first interface is a wireless interface;

a second interface; and

a cache controller operable to;

receive a classification of a parameter of a first device, the classification being one of;

dynamic, static, constant, and volatile;

receive a value of the parameter from the first device via the first interface;

store the value of the parameter for an amount of time that is based on the classification of the parameter;

receive a request for the value of the parameter from a second device via the second interface; and

send the stored value to the second device in response to the request.

9. The device of claim 8, wherein:

the cache controller is operable to send a read command to the first device via the first interface; and

the value of the parameter is received from the first device in response to the read command.

10. The device of claim 9, wherein the cache controller is operable to send the read command repeatedly at a predetermined time interval according to the classification of the parameter.

11. The device of claim 9, wherein:

the cache controller is operable to receive a value of a second parameter from the first device; and

the read command is sent in response to receiving the value of the second parameter.

12. The device of claim 9, wherein the cache controller is operable to:

receive a write value for the parameter from the second device via the second interface;

send a write command to the first device via the first interface to set the parameter to the write value; and

send the read command in response to completion of sending the write command.

13. The device of claim 8, wherein the cache controller is operable to remove the stored value of the parameter after the amount of time elapses without receiving the request for the value of the parameter from the second device.

14. A system comprising:

a first device associated with a parameter, wherein the parameter has a classification, the classification being one of;

dynamic, static, constant, and volatile;

a second device operable to send a request for a value of the parameter; and

a gateway comprising;

a first interface, wherein the first interface is a wireless interface;

a second interface; and

a cache controller operable to;

receive the classification of the parameter of the first device;

receive the value of the parameter from the first device via the wireless interface;

store the value of the parameter for an amount of time that is based on the classification of the parameter;

receive the request for the value of the parameter from the second device via the wireline interface; and

send the stored value to the second device in response to the request.

15. The system of claim 14, wherein:

the cache controller is operable to send a read command to the first device via the wireless interface; and

the value of the parameter is received from the first device in response to the read command.

16. The system of claim 15, wherein the cache controller is operable to send the read command repeatedly at a predete mined time interval according to the classification of the parameter.

17. The system of claim 15, wherein:

the cache controller is operable to receive a value of a second parameter from the first device; and

the read command is sent in response to receiving the value of the second parameter.

18. The system of claim 15, wherein the cache controller is operable to:

receive a write value for the parameter from the second device;

send a write command to the first device via the wireless interface to set the parameter to the write value; and

send the read command in response to completion of sending the write command.

19. The system of claim 14, wherein the cache controller is operable to remove the stored value of the parameter after the amount of time elapses without receiving the request for the value of the parameter from the second device.

20. The system of claim 14, wherein the cache controller is operable to:

receive an indication that the first device has been removed from the system; and

remove the stored value of the parameter in response to the indication.