Methods and systems for mobile device clock management
First Claim
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1. A method, at a mobile device, comprising:
- obtaining a first value of a sleep counter and a first time stamp prior to the mobile device entering a lower power state, wherein the first time stamp is referenced to a local network time;
entering a higher power state to acquire a paging signal;
obtaining a second value of the sleep counter and a second time stamp while in the higher power state,wherein the second time stamp is referenced to the local network time;
returning to the lower power state; and
while in the lower power state, estimating an increment cycle of the sleep counter based, at least in part, on a first difference between the first time stamp and the second time stamp, and at least in part on a second difference between the first value of the sleep counter and the second value of the sleep counter; and
while in the lower power state, perform an SPS position fix based, at least in part, on the estimated increment cycle of a sleep counter.
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Abstract
Disclosed are methods, systems and/or devices to calibrate a network time by acquisition of satellite positioning system (SPS) signals and different instances of time, and time-tagging SPS times according to the network time. In particular, the network time may be calibrated based, at least in part, on a first difference between first and second SPS times obtained at two SPS position fixes and a second difference between corresponding first and second time stamps.
28 Citations
28 Claims
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1. A method, at a mobile device, comprising:
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obtaining a first value of a sleep counter and a first time stamp prior to the mobile device entering a lower power state, wherein the first time stamp is referenced to a local network time; entering a higher power state to acquire a paging signal;
obtaining a second value of the sleep counter and a second time stamp while in the higher power state,wherein the second time stamp is referenced to the local network time; returning to the lower power state; and
while in the lower power state, estimating an increment cycle of the sleep counter based, at least in part, on a first difference between the first time stamp and the second time stamp, and at least in part on a second difference between the first value of the sleep counter and the second value of the sleep counter; andwhile in the lower power state, perform an SPS position fix based, at least in part, on the estimated increment cycle of a sleep counter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile device comprising:
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a receiver;
a sleep counter circuit; andone or more processors configured to; obtain a first value of a sleep counter and a first time stamp prior to the mobile device entering a lower power state, wherein the first time stamp is to be referenced to a local network time to be maintained at a base station; transition the mobile device to a higher power state to acquire a paging signal to be received at the receiver; obtain a second value of the sleep counter and a second time stamp while in the higher power state, wherein the second time stamp is to be referenced to the local network time; transition the mobile device to the lower power state;
while in the lower power state, estimate an increment cycle of the sleep counter based, at least in part, on a first difference between the first time stamp and the second time stamp, and based at least in part on a second difference between the first value of the sleep counter and the second value of the sleep counter; andwhile in the lower power state, perform an SPS position fix based, at least in part, on the estimated increment cycle of a sleep counter. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An article, comprising:
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a non-transitory storage medium having stored thereon instructions executable by a mobile device to; obtain a first value of a sleep counter and a first time stamp prior to the mobile device entering a lower power state, wherein the first time stamp is to be referenced to a local network time to be maintained at a base station; transition the mobile device to a higher power state to acquire a paging signal; obtain a second value of the sleep counter and a second time stamp while in the higher power state, wherein the second time stamp is to be referenced to the local network time; transition the mobile device to the lower power state; and while in the lower power state, estimate an increment cycle of the sleep counter based, at least in part, on a first difference between the first time stamp and the second time stamp, and based at least in part on a second difference between the first value of the sleep counter and the second value of the sleep counter; and while in the lower power state, perform an SPS position fix based, at least in part, on the estimated increment cycle of a sleep counter. - View Dependent Claims (18, 19, 20, 21)
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22. At a mobile device, an apparatus comprising:
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means for obtaining a first value of a sleep counter and a first time stamp prior to the mobile device entering a lower power state, wherein the first time stamp is referenced to a local network time maintained at a base station; means for entering a higher power state to acquire a paging signal; means for obtaining a second value of the sleep counter and a second time stamp while in the higher power state, wherein the second time stamp is referenced to the local network time;
means for returning to the lower power state;means for estimating, while in the lower power state, an increment cycle of the sleep counter based, at least in part, on a first difference between the first time stamp and the second time stamp, and based at least in part on a second difference between the first value of the sleep counter and the second value of the sleep counter; and means for performing an SPS position fix while in the lower power state based, at least in part, on the estimated increment cycle of a sleep counter. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification