Cell measurements in unlicensed frequency bands
AssigneeApple Inc.
InventorsTarik Tabet, Farouk Belghoul, Dawei Zhang, Huarui Liang
Life of this patent
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Abstract
This disclosure relates to performing cell measurements in unlicensed frequency bands and/or in channels with interference. According to some embodiments, a wireless user equipment (UE) device may define a reference symbol vector for a cell. Each respective element of the reference symbol vector may correspond to a respective subcarrier of the cell that carries a respective reference symbol. The UE may perform channel estimation at each respective element of the reference symbol vector. The UE may estimate the cell strength of the cell by cross-correlating channel estimates of different elements of the reference symbol vector.
Claims20
A method for a wireless user equipment (UE) device to perform cell measurements, comprising:
- by the UE device:
- defining a reference symbol vector for a cell, wherein each respective element of the reference symbol vector comprises a respective subcarrier of the cell that carries a respective reference symbol;
- performing channel estimation at each respective element of the reference symbol vector;
- estimating a cell strength of the cell in a first manner by cross-correlating channel estimates of different elements of the reference symbol vector.
A wireless user equipment (UE) device, comprising:
- a radio;
- and
- a processing element operably coupled to the radio;
- wherein the radio and the processing element are configured to:
- calculate cell strength of a first cell, wherein the cell strength of the first cell is calculated at least in part by cross-correlating channel estimates of different reference symbol subcarriers of the first cell;
- and
- provide an indication of the calculated cell strength of the first cell to a serving cell of the UE device.
A non-transitory computer accessible memory medium comprising program instructions which, when executed at a device, cause the device to:
- define a reference symbol vector for a cell, wherein each respective element of the reference symbol vector corresponds to a respective subcarrier of the cell that carries a respective reference symbol;
- perform channel estimation at each respective element of the reference symbol vector;
- estimate a cell strength of the cell in a first manner by cross-correlating channel estimates of different elements of the reference symbol vector;
- and
- provide an indication of the cell strength of the cell as estimated in the first manner to a serving cell of the device.
Dependencies are inferred from the claim text.