Patent ID: 6014548
Filing Date: 2000-01-11
Classification: H04B,H04W

Abstract:
In a multi-mode radio transceiver having receiver circuitry and transmitter circuitry permitting communication by way of the radio transceiver at least alternately with a first cellular communication network and with a second communication network, a combination with the receiver circuitry of apparatus for facilitating detection of a synchronization signal generated by the second communication network, the synchronization signal for synchronizing the radio transceiver with the second network, said apparatus comprising:a first-network cellular signal detector coupled to the receiver circuitry, said first-network cellular signal detector for detecting downlink control signals generated by the first cellular network;an information extractor coupled to the receiver circuitry and operable responsive to detection by said detector of the downlink control signals, said information extractor for extracting second-network, synchronization signal-location information from downlink informational signals generated by the first cellular network; anda second-network synchronization signal detector coupled to the receiver circuitry and operable responsive to the second-network, synchronization signal-location information extracted by said information extractor, said second-network synchronization signal detector for detecting the synchronization signal generated by the second communication network.