Handover measurements in a mobile communication system
First Claim
1. A method performed by a user equipment operating in a mobile communication system that comprises equipment for serving a plurality of geographic cells and having an air interface that is divided into sequentially occurring frames, wherein each of the frames consists of a plurality of sub-frames at least two of which are synchronization sub-frames, wherein for each of the cells served by the mobile communication system, a respective one of a plurality of cell-related synchronization signals is transmitted to user equipments in the at least two synchronization signal sub-frames of every frame, the method comprising:
- detecting a cell identity of a first cell in the mobile communication system;
detecting a cell identity of a second cell in the mobile communication system;
using a plurality of weights to control generation of a plurality of weighted handover measurements made from the first cell'"'"'s synchronization signals received during a plurality of synchronization sub-frames, wherein the plurality of weights are applied to measurements made for the first cell during respective ones of the plurality of synchronization sub-frames, and wherein each of the weights is a function of the cell identity of the first cell, the cell identity of the second cell, and which ones of the first and second cells'"'"' cell-related synchronization signals are transmitted in the respective one of the plurality of synchronization sub-frames during which the weight is applied;
generating a filtered handover measurement from the weighted handover measurements; and
providing the filtered handover measurement to a handover process that uses the filtered handover measurement to control a handover process involving the user equipment.
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Accused Products
Abstract
A cellular communication system has an air interface divided into frames, each consisting of sub-frames at least two of which are synchronization sub-frames. For each cell, different cell-related synchronization signals are transmitted to user equipments (UEs) in different synchronization signal sub-frames. The UE detects cell identities of first and second cells. Weights then control generation of weighted handover measurements made from the first cell'"'"'s synchronization signals received during synchronization sub-frames, wherein each of the weights is a function of the cell identity of the first cell, the cell identity of the second cell, and which ones of the first and second cells'"'"' cell-related synchronization signals are transmitted in the respective one of the plurality of synchronization sub-frames during which the weight is applied. A filtered handover measurement, upon which a handover decision can be made, is generated from the weighted handover measurements.
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Citations
18 Claims
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1. A method performed by a user equipment operating in a mobile communication system that comprises equipment for serving a plurality of geographic cells and having an air interface that is divided into sequentially occurring frames, wherein each of the frames consists of a plurality of sub-frames at least two of which are synchronization sub-frames, wherein for each of the cells served by the mobile communication system, a respective one of a plurality of cell-related synchronization signals is transmitted to user equipments in the at least two synchronization signal sub-frames of every frame, the method comprising:
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detecting a cell identity of a first cell in the mobile communication system; detecting a cell identity of a second cell in the mobile communication system; using a plurality of weights to control generation of a plurality of weighted handover measurements made from the first cell'"'"'s synchronization signals received during a plurality of synchronization sub-frames, wherein the plurality of weights are applied to measurements made for the first cell during respective ones of the plurality of synchronization sub-frames, and wherein each of the weights is a function of the cell identity of the first cell, the cell identity of the second cell, and which ones of the first and second cells'"'"' cell-related synchronization signals are transmitted in the respective one of the plurality of synchronization sub-frames during which the weight is applied; generating a filtered handover measurement from the weighted handover measurements; and providing the filtered handover measurement to a handover process that uses the filtered handover measurement to control a handover process involving the user equipment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for use in a user equipment operating in a mobile communication system that comprises equipment for serving a plurality of geographic cells and having an air interface that is divided into sequentially occurring frames, wherein each of the frames consists of a plurality of sub-frames at least two of which are synchronization sub-frames, wherein for each of the cells served by the mobile communication system, a respective one of a plurality of cell-related synchronization signals is transmitted to user equipments in the at least two synchronization signal sub-frames of every frame, the apparatus comprising:
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circuitry configured to detect a cell identity of a first cell in the mobile communication system; circuitry configured to detect a cell identity of a second cell in the mobile communication system; circuitry configured to use a plurality of weights to control generation of a plurality of weighted handover measurements made from the first cell'"'"'s synchronization signals received during a plurality of synchronization sub-frames, wherein the circuitry configured to use the plurality of weights applies the plurality of weights to measurements made for the first cell during respective ones of the plurality of synchronization sub-frames, and wherein each of the weights is a function of the cell identity of the first cell, the cell identity of the second cell, and which ones of the first and second cells'"'"' cell-related synchronization signals are transmitted in the respective one of the plurality of synchronization sub-frames during which the weight is applied; circuitry configured to generate a filtered handover measurement from the weighted handover measurements; and circuitry configured to provide the filtered handover measurement to a handover process that uses the filtered handover measurement to control a handover process involving the user equipment. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification