DETECTING A WLAN SIGNAL USING A BLUETOOTH RECEIVER DURING BLUETOOTH SCAN ACTIVITY
First Claim
1. A method comprising:
- (a) using a Bluetooth (BT) receiver Radio Frequency (RF) front end in a page scan mode to receive in a sequence of BT scan windows;
(b) receiving Wireless Local Area Network (WLAN) energy onto the Bluetooth (BT) receiver RF front end during one of the BT scan windows;
(c) using an energy detector to process an output signal of the BT receiver RF front end when the BT receiver RF front end is receiving the WLAN energy during the one of the BT scan windows; and
(d) based at least in part on a result of the processing of (c) asserting a wake-up signal, wherein the asserting of the wake-up signal is indicative of the BT receiver RF front end having received the WLAN energy during the one of the BT scan windows.
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Accused Products
Abstract
A BT receiver RF front end receives RF energy in a sequence of BT scan windows. Throughout a scan window, the front end is tuned to one hop frequency. Before and after the window the front end is in a disabled state. A WLAN energy detector processes an output of the front end during the window and determines whether more than a predetermined amount of RF energy was received onto the front end during the window. A BT baseband processor attempts to demodulate the output of the front end. If the WLAN energy detector determines that the predetermined amount of RF energy was received and if a BT signal could not be demodulated, then a WLAN wake-up signal is asserted, thereby causing a WLAN transceiver to be powered up to receive WLAN signals. BT scan intervals are varied in duration to facilitate a BT scan window overlapping a WLAN beacon.
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Citations
35 Claims
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1. A method comprising:
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(a) using a Bluetooth (BT) receiver Radio Frequency (RF) front end in a page scan mode to receive in a sequence of BT scan windows; (b) receiving Wireless Local Area Network (WLAN) energy onto the Bluetooth (BT) receiver RF front end during one of the BT scan windows; (c) using an energy detector to process an output signal of the BT receiver RF front end when the BT receiver RF front end is receiving the WLAN energy during the one of the BT scan windows; and (d) based at least in part on a result of the processing of (c) asserting a wake-up signal, wherein the asserting of the wake-up signal is indicative of the BT receiver RF front end having received the WLAN energy during the one of the BT scan windows. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method, comprising:
using a Bluetooth (BT) receiver in a page scan mode to scan in a plurality of BT scan windows, wherein each BT scan window is within a corresponding BT scan interval, wherein the BT scan intervals together are a sequence of BT scan intervals, and wherein the BT scan intervals of the sequence of BT scan intervals vary in duration. - View Dependent Claims (15, 16)
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17. A method comprising:
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(a) operating a Bluetooth (BT) receiver Radio Frequency (RF) front end in a BT page scan mode, wherein the BT receiver RF front end has a receive signal bandwidth that is substantially less than twenty megahertz; (b) using an energy detector to process an output signal of the BT receiver RF front end and as a result of the processing outputting a first signal indicative of whether the BT receiver RF front end has received an amount of RF energy; (c) using a BT baseband processor in an attempt to demodulate the output of the BT receiver RF front end and as a result of the attempted demodulation outputting a second signal indicative of whether the BT baseband processor could not successfully demodulate a BT signal; and (d) asserting a wake-up signal if both;
1) the first signal indicates the amount of RF energy was received, and
2) the second signal indicates that the BT baseband processor could not successfully demodulate a BT signal. - View Dependent Claims (18, 19)
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20. A circuit, comprising:
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a Bluetooth (BT) receiver Radio Frequency (RF) front end that receives an amount of WLAN energy in one BT scan window; a BT baseband processing circuit that receives an output signal from the BT receiver RF front end; and an energy detector that processes the output signal when the BT receiver RF front end is receiving the WLAN energy during the one BT scan window and based at least in part on a result of the processing asserts a wake-up signal, wherein the wake-up signal is indicative of the BT receiver RF front end having received the WLAN energy during the one BT scan window. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A circuit, comprising:
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a Bluetooth (BT) receiver Radio Frequency (RF) front end that receives an amount of WLAN energy in a single BT scan window; means for processing an output signal of the BT receiver RF front end when the BT receiver RF front end is receiving the WLAN energy during the single BT scan window and for asserting a wake-up signal as a result of the processing, wherein the wake-up signal is indicative of the BT receiver RF front end having received the amount of WLAN energy during the single BT scan window; and a BT baseband processing circuit that receives the output signal, wherein the BT baseband processing circuit attempts to demodulate the output signal when the BT receiver RF front end is receiving amount of WLAN energy in the single BT scan window. - View Dependent Claims (28, 29, 30, 31)
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32. A processor-readable medium storing a set of processor-executable instructions, wherein execution of the set of processor-executable instructions is for:
controlling a BT receiver RF front end to receive in a sequence of BT scan windows such that an output signal of the BT receiver RF front end is processed when the BT receiver RF front end is receiving an amount of WLAN energy and such that in response to the processing a wake-up signal is asserted, wherein the wake-up signal is indicative of the BT receiver RF front end having received the amount of WLAN energy during the one of the BT scan windows. - View Dependent Claims (33, 34, 35)
Specification