Using receive diversity to extend standby time in QPCH mode
First Claim
1. A method comprising:
- receiving a signal;
determining a signal-to-noise ratio of the signal; and
demodulating a first quick paging bit from the quick paging channel received through both a first receive chain and a second receive chain when the signal-to-noise ratio falls within a predetermined range, and when the quick paging channel is transmitted at a full rate; and
providing no power to the second receive chain and demodulating a second quick paging bit from the quick paging channel received through the first receive chain when the signal-to-noise ratio is above the predetermined range, and when the quick paging channel is transmitted at the full rate.
1 Assignment
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Accused Products
Abstract
The standby time of a CDMA cell phone is extended by using two receive chains to monitor the Quick Paging Channel (QPCH) when the signal-to-noise ratio falls within a predetermined range. Monitoring the QPCH saves battery power by obviating the need to monitor the general paging message unless quick paging (PI) bits are set. The QPCH is not monitored, however, in noisy environments where PI bits are incorrectly detected causing the paging message to be needlessly monitored. Power is saved by monitoring the QPCH in noisier environments without increasing the incorrect detection rate. Incorrect detection is reduced in the predetermined range by using an additional receive chain to achieve receive diversity. Although additional power is consumed by the second receive chain in the predetermined range, the power saved by not demodulating the paging message at each slot more than compensates for the additional power consumed by the second receive chain.
14 Citations
20 Claims
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1. A method comprising:
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receiving a signal; determining a signal-to-noise ratio of the signal; and demodulating a first quick paging bit from the quick paging channel received through both a first receive chain and a second receive chain when the signal-to-noise ratio falls within a predetermined range, and when the quick paging channel is transmitted at a full rate; and providing no power to the second receive chain and demodulating a second quick paging bit from the quick paging channel received through the first receive chain when the signal-to-noise ratio is above the predetermined range, and when the quick paging channel is transmitted at the full rate. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus comprising:
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means for receiving a signal; means for determining a signal-to-noise ratio of the signal; means for demodulating a first quick paging bit from the quick paging channel received through both a first receive chain and a second receive chain when the signal-to-noise ratio falls within a predetermined range, and when the quick paging channel is transmitted at a full rate; and means for providing no power to the second receive chain and means for demodulating a second quick paging bit from the quick paging channel received through the first receive chain when the signal-to-noise ratio is above the predetermined range, and when the quick paging channel is transmitted at the full rate. - View Dependent Claims (7, 8, 9, 10)
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11. A non-transitory processor-readable medium for storing instructions operable in a wireless device to:
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receive a signal; determine a signal-to-noise ratio of the signal; demodulate a first quick paging bit from the quick paging channel received through both a first receive chain and a second receive chain when the signal-to-noise ratio falls within a predetermined range, and when the quick paging channel is transmitted at a full rate; and provide no power to the second receive chain and demodulate a second quick paging bit from the quick paging channel received through the first receive chain when the signal-to-noise ratio is above the predetermined range, and when the quick paging channel is transmitted at the full rate. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus for wireless communication, comprising:
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at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured to; receive a signal; determine a signal-to-noise ratio of the signal; demodulate a first quick paging bit from the quick paging channel received through both a first receive chain and a second receive chain when the signal-to-noise ratio falls within a predetermined range, and when the quick paging channel is transmitted at a full rate; and provide no power to the second receive chain and demodulate a second quick paging bit from the quick paging channel received through the first receive chain when the signal-to-noise ratio is above the predetermined range, and when the quick paging channel is transmitted at the full rate. - View Dependent Claims (17, 18, 19, 20)
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Specification