Low power bluetooth page and inquiry scan
First Claim
1. A method of page and inquiry scanning in a Bluetooth compatible transceiver, said method comprising the steps of:
- scanning all Bluetooth frequencies within a time period less than or equal to the duration of a page or inquiry scan message and measuring energy received at each frequency scanned;
comparing the received energy against a first threshold and if greater, generating a detection signal; and
repeatedly performing said steps of scanning and comparing a predetermined number of times.
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Accused Products
Abstract
A novel and useful low power Bluetooth page and inquiry scan mechanism. Efficient and low power page and inquiry scans are performed by measuring the energy received at each frequency and comparing it to a threshold. If the energy sensed is greater than the threshold, normal Bluetooth page or inquiry scans are then performed within the scan window. The energy sensing is done by quickly sweeping the receiver in the radio over all 79 Bluetooth frequencies in less than 68 μs at least 19 times in order to cover at least 1.25 ms thus ensuring capturing any page or inquiry message transmissions. For noisy environments, a mechanism is provided to turn frequency sweeping off until interference is at a low enough level to reduce the number of false positive detections to an acceptable level.
109 Citations
25 Claims
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1. A method of page and inquiry scanning in a Bluetooth compatible transceiver, said method comprising the steps of:
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scanning all Bluetooth frequencies within a time period less than or equal to the duration of a page or inquiry scan message and measuring energy received at each frequency scanned;
comparing the received energy against a first threshold and if greater, generating a detection signal; and
repeatedly performing said steps of scanning and comparing a predetermined number of times. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for use with a radio receiver for scanning a range of RF frequencies for a message having a first duration, comprising:
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frequency scanning means for performing a predetermined number of frequency sweeps over said range of frequencies, said frequency scanning means comprising means for completing each frequency sweep within a time period less than or equal to said first duration;
means for measuring the energy received at each frequency; and
means for comparing the received energy with a first threshold and for generating a detection signal if said received energy is greater than said first threshold. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A Bluetooth communications device, comprising:
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a Bluetooth radio comprising a transmitter and a receiver;
a frequency scanner coupled to said receiver for performing a predetermined number of frequency sweeps over all Bluetooth frequencies, wherein each frequency sweep is competed within a time period less than or equal to the duration of a page or inquiry scan message;
an energy detector means coupled to said receiver for measuring the energy received by said receiver at each frequency; and
means for comparing the received energy with a first threshold and for generating a detection signal if said received energy is greater than said first threshold. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification
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- Resources
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Current AssigneeTexas Instruments, Inc.
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Original AssigneeTexas Instruments, Inc.
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InventorsDotan, Adi, Michael, Dan, Katz, Ran, Tzoreff, Yaniv
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Application NumberUS11/280,192Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current455/41.200CPC Class CodesH04W 16/14 Spectrum sharing arrangemen...H04W 24/00 Supervisory, monitoring or ...H04W 52/0245 according to signal strengthH04W 76/10 Connection setupH04W 84/18 Self-organising networks, e...Y02D 30/70 in wireless communication n...
