Patent ID: 8934387
Filing Date: 2015-01-13
Classification: H04B,H04W,Y02D

Abstract:
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 during which a WLAN transceiver is in a low power state and a BT transceiver, co-located with the WLAN transceiver and having the BT receiver RF front end, is scanning for a BT signal; (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; (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; (e) using a BT baseband processor to process the output signal of the Bluetooth receiver RF front end and as a result of the processing outputting a BT detected signal, wherein the BT detected signal is indicative of whether the BT baseband processor has successfully demodulated the output signal; and (f) using the BT detected signal to prevent the wake-up signal from being asserted if the BT baseband processor has successfully demodulated the output signal.