User equipment and method for estimating and updating a timing of a cell in a wireless communications network
First Claim
1. A method in a user equipment for updating a timing of a first cell, wherein the timing is the arrival time of a signal sent from a base station in the first cell relative to a clock in the user equipment, in a wireless communication network, the method comprising:
- maintaining a timing of a serving cell that serves the user equipment;
measuring a timing offset for the first cell and for each one of respective one or more second cells, wherein each of the timing offset measurements is a difference between an actual arrival time of a received signal at the user equipment and an expected arrival time of the received signal;
when a quality of the timing offset measurement of the first cell is below a first threshold,computing a timing offset estimate for the first cell based on the timing offset measurements for the respective one or more second cells; and
updating the timing of the first cell based on the computed timing offset estimate.
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Accused Products
Abstract
A method in a user equipment for updating a timing of a first cell is provided. The timing is the arrival time of a signal sent from a base station in the first cell relative to a clock in the user equipment in a wireless communication network. The user equipment measures a timing offset for the first cell and respective one or more second cells. When a quality of the timing offset measurement of the first cell is below a first threshold, the user equipment computes a timing offset estimate for the first cell based on the measured timing offset for the respective one or more second cells. The user equipment then updates the timing of the first cell based on the computed timing offset estimate.
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Citations
10 Claims
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1. A method in a user equipment for updating a timing of a first cell, wherein the timing is the arrival time of a signal sent from a base station in the first cell relative to a clock in the user equipment, in a wireless communication network, the method comprising:
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maintaining a timing of a serving cell that serves the user equipment; measuring a timing offset for the first cell and for each one of respective one or more second cells, wherein each of the timing offset measurements is a difference between an actual arrival time of a received signal at the user equipment and an expected arrival time of the received signal; when a quality of the timing offset measurement of the first cell is below a first threshold, computing a timing offset estimate for the first cell based on the timing offset measurements for the respective one or more second cells; and updating the timing of the first cell based on the computed timing offset estimate. - View Dependent Claims (2, 3, 4, 5)
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6. A user equipment for updating a timing of a first cell, wherein the timing is the arrival time of a signal sent from a base station in the first cell relative to a clock in the user equipment, in a wireless communication network, the user equipment comprising:
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a maintaining circuit configured to maintain a timing of a serving cell that serves the user equipment; a measuring circuit configured to measure a timing offset for the first cell and for each one of respective one or more second cells, wherein each of the timing offset measurements is a difference between an actual arrival time of a received signal at the user equipment and an expected arrival time of the received signal; a computing circuit configured to compute a timing offset estimate for the first cell based on the timing offset measurements for the respective one or more second cells, when a quality of the timing offset measurement of the first cell is below a first threshold; and an updating circuit configured to update the timing of the first cell based on the computed timing offset estimate, when said quality of the timing offset measurement of the first cell is below the first threshold. - View Dependent Claims (7, 8, 9, 10)
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Specification