Wireless communications system having reduced noise mode operation capability

• US 8,170,627 B2
• Filed: 12/15/2007
• Issued: 05/01/2012
• Est. Priority Date: 08/20/1996
• Status: Expired due to Fees

• Current Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Original Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Inventors: Rohde, John K., Traeger, Robert J., Erb, Patrick R., Alt, Daniel E., Klostermann, Daniel J., Grabon, Robert J.
• Primary Examiner(s): LEE, JUSTIN YE
• Application Number:
  US12/002,303
• Publication Number:
  US 20080212724A1
• Time in Patent Office: 1,599 Days
• Field of Search: 455/73, 455/74.1, 455/75, 455/91, 455/95, 455/103, 455/113, 455/123, 455/429, 455/575.1, 375/346
• US Class Current: 455/575.1
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus
• CPC Class Codes: H04B 2215/066 by stopping a clock generator

Abstract

A wireless communication system having a terminal unit operates in a reduced noise state during receipt of a wireless transmission from a control unit. The terminal unit includes terminal circuitry, a radio and noise management circuitry. The noise management circuitry partially or fully disables operation of the terminal circuitry during a receipt by the radio. Noise management circuitry may disable a terminal processor, disable interrupts, buffer interrupts and otherwise modify operation of the terminal circuitry to reduce generated radio noise that would otherwise interfere with receipt of data by the radio. The wireless communication system includes noise management circuitry located in a control unit that operates in conjunction with noise management circuitry in a first terminal unit and a second terminal unit to schedule transmissions from the control unit. These scheduled transmissions allow the terminal units to perform required processing functions outside of the reduced noise period.

Claims

1. A wireless communication system comprising:

a terminal system;

a radio system operably coupled to the terminal system; and

a noise management system coupled to the terminal system and the radio system;

said noise management system selectively altering operation of the terminal system during reduced noise operation to reduce generated background noise during a wireless receipt by the radio system; and

an interrupt control system controlling assertion of interrupts the during reduced noise operation and preventing the assertion of interrupts during the wireless receipt by the radio system so as to reduce generation of noise by the terminal system due to the assertion of interrupts, said interrupt control system providing for assertion of such interrupts when the reduced noise operation has been released.

2. A wireless communication system according to claim 1, wherein the terminal system comprises peripheral devices and a processor interrupt interface, and the interrupt control system comprises interrupt arbitration and persistence circuitry and a data buffer;

the interrupt arbitration and persistence circuitry receiving interrupts from the peripheral devices and buffering the interrupts in the data buffer during reduced noise operation so as to reduce generation of noise by the terminal system due to assertion of interrupts, and effecting assertion of the interrupts via the processor interrupt interface when the reduced noise operation is terminated.

3. A wireless communication system according to claim 1, wherein the terminal system may be interrupted by a higher priority terminal system event to exit the reduced noise operation, the terminal system continuing radio system reception without the benefit of the reduced noise operation.

4. A wireless communication system comprising:

a terminal system;

a radio system operably coupled to the terminal system; and

a noise management system coupled to the terminal system and the radio system;

said noise management system selectively altering normal processing functions of the terminal system during reduced noise operation to reduce generated background noise during a wireless receipt by the radio system;

said terminal system receiving information that a wireless transmission is to be expected at a given time, and at the given time when the wireless transmission is expected said noise management system placing the terminal system in the reduced noise operation to reduce generated background noise during the wireless receipt by the radio system; and

upon receipt of a wireless transmission, the terminal system exiting the reduced noise operation and commencing normal processing functions.

5. A wireless communication system according to claim 4, wherein said noise management system places the terminal system in the reduced noise operation with partially or fully disabled functions just prior to receipt of a wireless transmission, and upon receipt of the wireless transmission the terminal system exiting the reduced noise operation and commencing the normal processing functions.

6. A wireless communication system according to claim 5, wherein said noise management system places the terminal system in the reduced noise operation for a duration of about fifty milliseconds.

7. A wireless communication system according to claim 4, wherein said noise management system places the terminal system in the reduced noise operation with functions of the terminal system disabled, taking account of factors comprising terminal system location.

8. A wireless communication system according to claim 4, wherein said radio system sends to a control unit a wireless transmission specifying a data packet duration to be used in communicating with the terminal system.

9. A wireless communication system according to claim 4, wherein said radio system sends to a control unit a wireless transmission specifying an interval between signals to be used in communicating with the radio system.

10. A wireless communication system according to claim 4, wherein said radio system sends to a control unit a wireless transmission signaling for a control unit to cease sending data, the terminal system then exiting the reduced noise operation.

11. A wireless communication system according to claim 4, wherein said noise management system places the terminal system in the reduced noise operation prior to synchronization with a hello message, the terminal system upon receipt of the hello message exiting the reduced noise operation and commencing the normal processing functions.

12. A plural station wireless communication system comprising a terminal communication system comprising:

a terminal system;

a terminal radio system operably coupled to the terminal system; and

a terminal noise management system coupled to the terminal system and the terminal radio system;

said terminal noise management system selectively altering operation of the terminal system into a reduced noise operation to reduce generated background noise during a wireless receipt by the terminal radio system;

a control communication system comprising a control system and a control radio system;

the terminal communication system and the control communication system cooperatively scheduling data transfer wherein the terminal system is in the reduced noise operation to reduce generated background noise during the wireless receipt by the terminal radio system;

the terminal system exiting the reduced noise operation and resuming normal processing upon completion of the data transfer.

13. A plural station wireless communication system according to claim 12, wherein the terminal communication system and the control communication system intercommunicate that transmission is complete once all data is received, whereupon the terminal system exits the reduced noise operation and resumes the normal processing.

14. A plural station wireless communication system according to claim 12, wherein the terminal communication system and the control communication system cooperatively adjust poll interval durations.

15. A plural station wireless communication system according to claim 12, wherein the terminal communication system and a control unit cooperatively adjust data packet sizes.

16. A plural station wireless communication system according to claim 12, wherein the terminal communication system and the control communication system cooperatively adjust data packet sizes.

17. A plural station wireless communication system according to claim 12, wherein said terminal communication system sends to the control communication system a wireless transmission signaling for the control communication system to cease sending data, the terminal system then exiting the reduced noise operation.

18. A plural station wireless communication system according to claim 12, wherein said terminal noise management system based on a wireless transmission from the control communication system places the terminal system in the reduced noise operation with partially or fully disabled functions just prior to receipt of a further wireless transmission from the control communication system, and upon receipt of the further wireless transmission, the terminal system exits reduced noise operation and commences normal processing functions.

19. A plural station wireless communication system according to claim 18, wherein said terminal noise management system places the terminal system in reduced noise operation for a duration of about fifty milliseconds before the terminal system exits the reduced noise operation.

20. A plural station wireless communication system according to claim 12, with said noise management system selecting the reduced noise operation based on factors comprising system factors provided in a wireless transmission from the control communication system.