System for communicating messages via a forward overhead control channel for a programmable logic control device

• US 6,718,177 B1
• Filed: 09/20/2000
• Issued: 04/06/2004
• Est. Priority Date: 09/20/1999
• Status: Expired due to Term

• Current Assignee: Numerex Corporation (Sierra Wireless Incorporated)
• Original Assignee: Cellemetry, LLC (Sierra Wireless Incorporated)
• Inventors: Jansson, Edward R., Comer, Edward I.
• Primary Examiner(s): Maung, Nay
• Assistant Examiner(s): Corsaro, Nick
• Application Number:
  US09/666,042
• Time in Patent Office: 1,294 Days
• Field of Search: 455/567, 455/574, 455/515, 455/458, 455/466, 455/434, 455/414.1, 455/414.2, 455/419, 455/556.1, 455/556.2, 340/7.41, 340/7.39, 340/825.22, 340/825.23
• US Class Current: 455/458
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 68/025 Indirect paging
• CPC Class Codes: H04W 8/18 Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data

Abstract

Communicating commands and/or data to a remote controller, such as a programmable logic controller, coupled to a cellular communications device. Each cellular communications device can monitor the cellular network control channel for a pair of target pages within a first time period. In the event that a cellular communications device receives target pages having a matching specific identifier, the device will monitor the cellular network control channel over a second time period for at least one command page or data page. The cellular communications device can respond to the reception of one or more command or data pages by forwarding instructions or information to the controller via a communications link. In addition, the cellular communications device can acknowledge receipt of the data or command pages by issuing an acknowledgment signal.

Claims

1. A method for communicating with each selected one of a plurality of cellular communication devices by sending multiple pages via a cellular network control channel of a cellular mobile radio telephone system, comprising the steps of:

(a) monitoring the cellular network control channel for pages within a first time period, each of the pages having a specific identifier assigned to the selected communications device;

(b) responsive to receiving two pages having the specific identifier within the first time period, monitoring for a second time period the cellular network control channel for at least one page having a predetermined characteristic designating the page as carrying data; and

(c) responsive to receiving the at least one page having a predetermined characteristic during the second time period, collecting the data carried by the page and sending an acknowledgement signal via the cellular network control channel to acknowledge receipt of the data, otherwise returning to step (a).

2. The method of claim 1, wherein if the predetermined characteristic in a first one of the pages specifies that a pair of the pages carry data, then

monitoring for the second one of the pages having the predetermined characteristic and carrying data during another second time period; and

responsive to receiving the second one of the pages, collecting the data carried by the second page and sending the acknowledgement signal via the cellular network control channel to acknowledge receipt of the data carried by the first and the second pages.

3. The method of claim 2, wherein the acknowledgement signal comprises an Autonomous Registration signal comprising a predetermined acknowledge pattern and the collected data.

4. The method of claim 1, wherein if the predetermined characteristic in a first one of the pages specifies that only the first page carries data, then collecting the data carried by the first page and sending the acknowledgement signal via the cellular network control channel to acknowledge receipt of the data carried by the first page.

5. The method of claim 4, wherein the acknowledgement signal comprises an Autonomous Registration signal comprising a predetermined acknowledge pattern and the collected data.

6. The method of claim 1 further comprising the step of providing the collected data to a programmable logic controller (PLC) for use as programming data to control the operation of the PLC.

7. A method for communicating a programming command to a programmable logic controller (PLC) by sending multiple pages via a cellular network control channel of a cellular mobile radio telephone system, comprising the steps of:

(a) monitoring the cellular network control channel for a target page having a specific identifier assigned to a selected cellular communications device coupled to the PLC;

(b) responsive to receiving the target page, monitoring the cellular network control channel at the cellular communications device for a predetermined time period for a schedule command page having a schedule command identifying a slot in a look-up table maintained by the PLC, the slot operative as a storage location in the look-up table for storing the programming command for the PLC; and

(c) responsive to receiving the schedule command page during the predetermined time period, forwarding the slot identity from the cellular communications device to the PLC to initiate the programming command maintained at the slot and sending an acknowledgement signal via the cellular network control channel to acknowledge receipt of the schedule command page.

8. The method of claim 7, further comprising the step of transmitting the target page from a mobile switching center.

9. The method of claim 7, further comprising the step of transmitting the schedule command page from a mobile switching center.

10. The method of claim 7, wherein the cellular network control channel is a forward overhead control channel.

11. A method for communicating a reprogramming command to a programmable logic controller (PLC) by sending multiple pages via a cellular network control channel of a cellular mobile radio telephone system, comprising the steps of:

(a) monitoring the cellular network control channel for a target page having a specific identifier assigned to a communications device coupled to the PLC;

(b) responsive to receiving the target page, monitoring for a predetermined time period the cellular network control channel for a schedule command page having a schedule command identifying a memory location containing programming data for the PLC;

(c) responsive to receiving the schedule command page during the predetermined time period, monitoring the cellular network control channel for a page carrying new programming data; and

(d) responsive to receiving the page carrying programming data, forwarding the memory location identity and the new programming data to the PLC, and sending an acknowledgment signal via the cellular network control channel to acknowledge receipt of the schedule command and data.

12. The method of claim 11, further comprising the step of transmitting one or more of the target page, the schedule command page, and the programming data page from a mobile switching center.

13. The method of claim 11, wherein the cellular network control channel is a forward overhead control channel.

14. A computer-readable medium having computer-executable instructions to implement a method comprising the steps of:

monitoring a cellular network control channel for pages within a first time period, each of the pages having a specific identifier assigned to the selected communications device;

responsive to receiving a predetermined number of pages having the specific identifier within the first time period, monitoring for a second time period the cellular network control channel for at least one page having a predetermined characteristic designating the page as carrying data;

responsive to receiving the at least one page having a predetermined characteristic during the second time period, collecting the data carried by the page;

responsive to the predetermined characteristic specifying that a pair of pages carry data, monitoring for the second page having a predetermined characteristic and carrying data during another second time period; and

responsive to receiving the second page having the predetermined characteristic, collecting the data carried by the second page and sending an acknowledgment signal via the cellular network control channel to acknowledge receipt of the data carried by the first and the second pages.

15. The computer-readable medium of claim 14 having further computer-executable instructions to implement a method comprising the step of:

sending the acknowledgement signal comprising an Autonomous Registration signal comprising a predetermined acknowledge pattern and the collected data.

16. The computer-readable medium of claim 14 having further computer-executable instructions to implement a method comprising the step of:

providing the collected data to a programmable logic controller (PLC) for use as programming data to control the operation of the PLC.

17. A communications device, operable for receiving multiple pages via a cellular network control channel and communicating a reprogramming command to a PLC coupled to the communications device, the communications device operable to:

(a) monitor the cellular network control channel for a target page having a specific identifier assigned to the communications device coupled to the PLC;

(b) responsive to receiving the target page, monitoring for a predetermined time period the cellular network control channel for a schedule command page having a schedule command identifying a memory location containing programming data for the PLC;

(c) responsive to receiving the schedule command page during the predetermined time period, monitoring the cellular network control channel for a page carrying new programming data; and

(d) responsive to receiving the page carrying programming data, forwarding the memory location identity and the new programming data to the PLC, and sending an acknowledgment signal via the cellular network control channel to acknowledge receipt of the schedule command and data.

18. The communications device of claim 17 further operable for receiving from a mobile switching center one or more of the target page, the schedule command page, and the programming page.

19. The communications device of claim 17, wherein the cellular network control channel is a forward overhead control channel.

20. A method for communicating with a controller device by sending multiple pages via a cellular network control channel of a cellular mobile radio telephone system, comprising the steps of:

(a) monitoring the cellular network control channel for at least one target page within a first time period, the target page having a specific identifier assigned to a cellular communications device coupled to the controller device;

(b) responsive to receiving the at least one target page having the specific identifier within the first time period, monitoring for a second time period the cellular network control channel for at least one data page having a predetermined characteristic designating the data page as carrying data; and

(c) responsive to receiving the at least one data page having the predetermined characteristic during the second time period, collecting the data carried by the page and sending an acknowledgement signal via the cellular network control channel to acknowledge receipt of the data.

21. The method of claim 20, wherein if the predetermined characteristic specifies that a pair of data pages carry data, then

monitoring for the second one of the data pages having the predetermined characteristic and carrying data during another second time period; and

responsive to receiving the second one of the data pages, collecting the data carried by the second page and sending the acknowledgement signal via the cellular network control channel to acknowledge receipt of the data carried by the first and second data pages.

22. The method of claim 20, wherein the collected data is programming data for operating the controller device.