Multi-mode radio frequency network system

• US 6,295,461 B1
• Filed: 11/03/1997
• Issued: 09/25/2001
• Est. Priority Date: 11/03/1997
• Status: Expired due to Term

• Current Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Original Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Inventors: Palmer, Brian G., Jovanovich, Alan F.
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): CHOW, CHARLES CHIANG
• Application Number:
  US08/962,908
• Time in Patent Office: 1,422 Days
• Field of Search: 455/11.1, 455/557, 455/403, 455/131, 395/800, 375/202, 340/870.02, 340/539
• US Class Current: 455/557
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A multi-mode radio frequency network comprises a first type of computing device having a radio receiver/transmitter adapted for communication over a narrowband frequency range, and a second type of computing device having a radio receiver/transmitter adapted for communication over both the narrowband frequency range and a wideband frequency range. A network access controller is adapted for communication with both types of computing device over respective ones of the narrowband and wideband frequency ranges. The network access controller provides synchronization signals for coordinating the timing of communications over the narrowband and wideband frequency ranges. The second type of computing device may be adapted for either frequency-hopping or direct sequence spread spectrum communication signals over the wideband frequency range. The synchronization signals further comprise periodic beacon signals that define discrete time periods which further include a synchronous portion for communication of the narrowband signals and an asynchronous portion for communication of the wideband signal. The multi-mode radio frequency network may further include data storage/retrieval devices and data collection devices adapted for communication with the first and second types of computing device over the narrowband frequency range.

Claims

1. A multi-mode radio frequency network, comprising:

at least one of a data collection device and a data storage/retrieval device;

at least one first type of computing device having a first radio receiver/transmitter adapted for communication over a narrowband frequency range;

at least one second type of computing device having a second radio receiver/transmitter adapted for communication over both said narrowband frequency range and a wideband frequency range; and

a network access controller including at least one access point, said controller adapted for communication with said at least one first type of computing device and said at least one second type of computing device over respective ones of said narrowband and said wideband frequency ranges, said network access controller providing periodic beacon signals via said access point for coordinating timing of communications over said narrowband and said wideband frequency ranges, said periodic beacon signals including a start period for beginning RF communication, a synchronous communication period and an asynchronous communication period,

wherein said at least one second type of computing device communicates with said at least one first type of computing device, said at least one of a data collection device and data storage/retrieval device during said synchronous communication period and said at least one second type of computing device communicates with said access point during said asynchronous communication period.

2. The multi-mode radio frequency network of claim 1, wherein said second radio receiver/transmitter provides spread spectrum communication signals over said wideband frequency range.

3. The multi-mode radio frequency network of claim 2, wherein said spread spectrum communication signals further comprise frequency-hopping spread spectrum signals.

4. The multi-mode radio frequency network of claim 2, wherein said spread spectrum communication signals further comprise direct sequence spread spectrum signals.

5. The multi-mode radio frequency network of claim 1, wherein said wideband frequency range communications occur in a substantially asynchronous manner.

6. The multi-mode radio frequency network of claim 1, wherein said narrowband frequency range communications occur in a substantially synchronous manner.

7. The multi-mode radio frequency network of claim 1, further comprising at least one data storage/retrieval device adapted for communication with each of said at least one first type of computing device and said at least one second type of computing device over said narrowband frequency range.

8. The multi-mode radio frequency network of claim 1, further comprising at least one data collection device adapted for communication with said at least one first type of computing device and said at least one second type of computing device over said narrowband frequency range.

9. The multi-mode radio frequency network of claim 1, wherein said second radio receiver/transmitter further comprises an intermediate frequency portion having a wideband filter, a narrowband filter, and means for switching between said wideband and narrowband filters based upon said synchronization signals.

10. The multi-mode radio frequency network of claim 1, wherein said second radio receiver/transmitter further comprises:

a receive section adapted to receive radio frequency (RF) signals over said wideband and said narrowband frequency ranges and having a dowconversion mixer to mix the RF signals with a frequency-shifted carrier signal to downconvert the RF signals to intermediate frequency (IF) signals;

an IF filter section adapted to receive said IF signals and having a wideband bandpass filter and a narrowband bandpass filter that are alternatively coupled to said IF signals to provide filtered IF signals;

a demodulation section adapted to receive said filtered IF signals and recover wideband and narrowband receive signals therefrom;

a synthesizer section adapted to generate said frequency-shifted carrier for said receive section, said frequency-shifted carrier being further modulated by wideband and narrowband transmit data signals to provide modulated transmit signals; and

a transmit section adapted to transmit said modulated transmit signals.

11. The multi-mode radio frequency network of claim 10, further comprising a control section adapted to select between said wideband bandpass filter and said narrowband bandpass filter.

12. The multi-mode radio frequency network of claim 1, wherein said second radio receiver/transmitter further comprises:

a receive section adapted to receive radio frequency (RF) signals and having a downconversion mixer to mix the RF signals with a carrier signal to downconvert the RF signals to intermediate frequency (IF) signals;

a demodulation section adapted to receive said filtered IF signals and provide in-phase and quadrature receive data signals therefrom;

a synthesizer section adapted to generate said carrier for said receive section, said carrier being further modulated by in-phase and quadrature transmit data signals;

a transmit section adapted to transmit said modulated transmit signals; and

a control section adapted to control switching between wideband and narrowband modes of said second radio receiver/transmitter, wherein said in-phase and quadrature receive signals comprise wideband data in said wideband mode of said second radio receiver/transmitter, and said in-phase receive signals comprising narrowband data in said narrowband mode of said second radio receiver/transmitter.

13. The multi-mode radio frequency network of claim 12, wherein said demodulation section further comprises a demodulator adapted to recover frequency modulation (FM) from said narrowband data and quadrature phase shift key (QPSK) modulation from said wideband data.

14. The multi-mode radio frequency network of claim 12, wherein said wideband data further comprises direct sequence spread spectrum data.

15. An apparatus for communicating in both narrowband and wideband frequency ranges with other types of communication devices over a multi-mode radio frequency network, said network having a network access controller that provides periodic beacon signals including a synchronous communication period and asynchronous communication period, comprising:

a receive section adapted to receive radio frequency (RF) signals and having a downconversion mixer to mix the RF signals with a frequency-shifted carrier signal to downconvert the RF signals to intermediate (IF) signals;

an IF filter section adapted to receive said IF signals and having a wideband bandpass filter and a narrowband bandpass filter that are alternatively coupled to said IF signals to provide filtered IF signals;

a demodulation section adapted to receive said filtered IF signals and recover wideband and narrowband receive signals therefrom;

a synthesizer section adapted to generate said frequency-shifted carrier for said receive section, said frequency-shifted carrier being further modulated by wideband and narrowband transmit data signals to provide modulated transmit signals; and

a transmit section adapted to transmit said modulated transmit signals,

wherein said apparatus communicates with said other types of communication devices during respective ones of said synchronous and asynchronous communication periods.

16. The apparatus of claim 15, wherein said demodulation section further comprises a demodulator adapted to recover frequency modulation (FM) from said narrowband signals and frequency shift key (FSK) modulation from said wideband signals.

17. An apparatus for communicating in both narrowband and wideband frequency ranges with other types of communication devices over a multi-mode radio frequency network, said network having a network access controller that provides periodic beacon signals including a synchronous communication period and asynchronous communication period, comprising:

a receive section adapted to receive radio frequency (RF) signals and having a downconversion mixer to mix the RF signals with a carrier signal to downconvert the RF signals to intermediate frequency (IF) signals;

a demodulation section adapted to receive said filtered IF signals and provide in-phase and quadrature receive data signals therefrom;

a synthesizer section adapted to generate said carrier for said receive section, said carrier being further modulated by in-phase and quadrature transmit data signals;

a transmit section adapted to transmit said modulated transmit signals; and

a control section adapted to control switching between wideband and narrowband modes of said apparatus, wherein said in-phase and quadrature receive signals comprise wideband data in said wideband mode of the apparatus, and said in-phase receive signals comprising narrowband data in said narrowband mode of the apparatus,

wherein said apparatus communicates with said other types of communication devices during respective ones of said synchronous and asynchronous communication periods.

18. The apparatus of claim 17, wherein said demodulation section further comprises a demodulator adapted to recover frequency modulation (FM) from said narrowband data and quadrature phase shift key (QPSK) modulation from said wideband data.

19. The apparatus of claim 17, wherein said wideband data further comprises direct sequence spread spectrum data.