Mobile station time reference that is adjusted based on propagation delay
First Claim
1. A method, comprising:
- a mobile station receiving system time information from a source base transceiver station (BTS) in a spread spectrum communication system;
said mobile station estimating a distance between said mobile station and said source BTS;
said mobile station identifying a PN offset for a pilot signal transmitted by a target BTS;
said mobile station calculating a propagation delay based on said estimated distance;
said mobile station developing a propagation-delay-adjusted time reference based on said system time information and said calculated propagation delay; and
said mobile station searching for said target BTS in said spread spectrum communication system at said PN offset measured from said propagation-delay-adjusted time reference.
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Accused Products
Abstract
A mobile station receives system time information from a source base transceiver station (BTS) in a spread spectrum communication system. The mobile station estimates a distance between the mobile station and the source BTS. The mobile station calculates a propagation delay based on the estimated distance. The mobile station develops a propagation-delay-adjusted time reference based on the system time information and the calculated propagation delay. The mobile station uses the propagation-delay-adjusted time reference to search for a target pseudonoise (PN) offset corresponding to a target BTS in the spread spectrum communication system. The mobile station may be closer to the target BTS than the source BTS.
29 Citations
17 Claims
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1. A method, comprising:
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a mobile station receiving system time information from a source base transceiver station (BTS) in a spread spectrum communication system; said mobile station estimating a distance between said mobile station and said source BTS; said mobile station identifying a PN offset for a pilot signal transmitted by a target BTS; said mobile station calculating a propagation delay based on said estimated distance; said mobile station developing a propagation-delay-adjusted time reference based on said system time information and said calculated propagation delay; and said mobile station searching for said target BTS in said spread spectrum communication system at said PN offset measured from said propagation-delay-adjusted time reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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a spread spectrum communication system serving a mobile station via a source base transceiver station(BTS), wherein said spread spectrum communication system comprises a plurality of BTSs; said spread spectrum communication system maintaining an active set for said mobile station, wherein said active set identifies any BTSs in said spread spectrum communication system that have forward traffic channels assigned to said mobile station;
said source BTS assigning to said mobile station a forward traffic channel for a call involving said mobile station;determining that said active set for said mobile station identifies only said source BTS; and in response to determining that said active set for said mobile station identifies only said source BTS, said source BTS transmitting location coordinates of said source BTS over said forward traffic channel assigned to said mobile station. - View Dependent Claims (11, 12, 13, 14)
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15. A mobile station, comprising:
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a transceiver for wireless communication with a spread spectrum communication system; a processor; data storage; program instructions stored in said data storage and executable by said processor to cause said mobile station to perform functions comprising; (a) receiving, through said transceiver, system time information transmitted by a source base transceiver station (BTS) in said spread spectrum communication system; (b) estimating a distance between said mobile station and said source BTS; (c) calculating a propagation delay based on said estimated distance; (d) developing a propagation-delay-adjusted time reference based on said system time information transmitted by said source BTS and said calculated propagation delay; and (e) identifying a PN offset for a pilot signal transmitted by a target BTS; and (f) searching for said target BTS at the PN offset measured from said propagation-delay-adjusted time reference. - View Dependent Claims (16, 17)
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Specification