Reduced subset scan and dual frequency wakeup for bluetooth inquiry operation
First Claim
1. A wireless communication apparatus, comprising:
- a wireless communication interface for transmitting an inquiry message over a wireless communication channel;
a controller arranged to produce a select signal corresponding to one of a first and second plurality of frequencies, the select signal initially corresponding to the first plurality of frequencies for every inquiry message; and
a frequency selection apparatus coupled to said wireless communication interface for controlling said wireless communication interface to transmit the inquiry message successively an each of the first plurality of frequencies and thereafter successively on each of the second plurality of frequencies in response to the select signal.
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Accused Products
Abstract
An inquiry message is transmitted successively on each of a first plurality of transmit frequencies (44–48) and thereafter successively on each of a second plurality of transmit frequencies (51), in order to ensure that a first wireless communication apparatus that listens on one of the transmit frequencies will receive the inquiry message. The first plurality of transmit frequencies can also be ensured (25–28) to include a frequency on which a second wireless communication apparatus is listening for the inquiry message. With respect to reception of an inquiry message that is transmitted successively on each of first and thereafter second pluralities of transmit frequencies, after receipt (61) of the initial inquiry message and subsequent expiration of a corresponding backoff period (62), the inquiry message is first listened for on a first frequency of the first plurality of transmit frequencies for a predetermined time (63). If the inquiry message is not received on the first frequency during the first listening operation, the inquiry message is then listened for on a second frequency of the second plurality of transmit frequencies for a predetermined time (64).
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Citations
49 Claims
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1. A wireless communication apparatus, comprising:
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a wireless communication interface for transmitting an inquiry message over a wireless communication channel; a controller arranged to produce a select signal corresponding to one of a first and second plurality of frequencies, the select signal initially corresponding to the first plurality of frequencies for every inquiry message; and a frequency selection apparatus coupled to said wireless communication interface for controlling said wireless communication interface to transmit the inquiry message successively an each of the first plurality of frequencies and thereafter successively on each of the second plurality of frequencies in response to the select signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of wireless communication, comprising:
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entering an inquiry state for producing an inquiry message on a first and a second plurality of frequencies; selecting the first plurality of frequencies for every initial inquiry message after the step of entering; selecting the second plurality of frequencies for a subsequent inquiry message; and transmitting the inquiry message successively on each of the first plurality of frequencies and thereafter successively on each of the second plurality of frequencies. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of receiving an inquiry message transmitted successively on each of a first plurality of wireless communication frequencies and thereafter successively on each of a second plurality of wireless communication frequencies, comprising:
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initially receiving the inquiry message, and thereafter waiting until expiration of a backoff period of time; first listening for said inquiry message for a predetermined time on a first frequency of said first plurality of frequencies in response to expiration of said backoff period; and second listening for said inquiry message for a predetermined time on a second frequency of the second plurality of frequencies if said inquiry message is not received on said first frequency during said first listening step. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A wireless communication apparatus for receiving an inquiry message transmitted successively on each of a first plurality of wireless communication frequencies and thereafter successively on each of a second plurality of wireless communication frequencies, comprising:
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a wireless communication interface far initially receiving the inquiry message; a controller coupled to said wireless communication interface and responsive to initial receipt of the inquiry message for implementing a backoff time period; a frequency selection apparatus coupled to said controller and said wireless communication interface and responsive to said controller after expiration of said backoff period for directing said wireless communication interface to first listen for said inquiry message for a predetermined time on a first frequency of said first plurality of frequencies; and said frequency selection apparatus responsive to said controller if said inquiry message is not received on said first frequency during said first listening operation for directing said wireless communication interface to secondly listen for said inquiry message for a predetermined time on a second frequency of said second plurality of frequencies. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification