Method and system for mitigation of unlisted cell impacts in idle mode of cellular systems
First Claim
1. A method for operating a user equipment, comprising:
- receiving, by the user equipment, signals from a serving cell and a plurality of neighbor cells, wherein the plurality of neighbor cells include listed neighbor cells that are listed in a neighboring cell list and unlisted neighbor cells that are unlisted in the neighboring cell list;
storing, by the user equipment, samples of the received signals from the listed neighbor cells and the unlisted neighbor cells;
performing, by the user equipment, a cell search within the stored samples of the received listed and unlisted neighbor cell signals to identify a first unlisted neighbor cell from among the unlisted neighbor cells, the cell search comprising;
validating the first unlisted neighbor cell based on a corresponding stored sample from among the stored samples of the received listed and unlisted neighbor cell signals;
adding the validated unlisted neighbor cell to the neighboring cell list; and
mitigating interference, caused by the validated unlisted neighbor cell, from the stored samples of the received listed and unlisted neighbor cell signals; and
repeating, by the user equipment, the cell search for a second unlisted neighbor cell from among the unlisted neighbor cells using the mitigated stored samples.
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Accused Products
Abstract
A UE, in an idle mode, receives pilot signals and synchronization signals from a serving cell and neighbor cells comprising neighbor cells listed and/or unlisted in a neighboring cell list. The UE validates each of the serving cell, the listed neighbor cells and the unlisted neighbor cells from the received signals. The UE performs cell measurement on the listed cells as well as the unlisted cells for multipath profiles and associated power levels. In instances where number of attempts of the cell measurements on the unlisted cells exceeds a threshold value, the UE may validate presence of the unlisted cells. The best available cell is selected from the listed cells and the unlisted for the UE to camp on. I/Q samples of the received signals are stored while measuring or monitoring the cells. The stored I/Q samples may be utilized to carry out baseband procedures through offline processing.
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Citations
22 Claims
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1. A method for operating a user equipment, comprising:
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receiving, by the user equipment, signals from a serving cell and a plurality of neighbor cells, wherein the plurality of neighbor cells include listed neighbor cells that are listed in a neighboring cell list and unlisted neighbor cells that are unlisted in the neighboring cell list; storing, by the user equipment, samples of the received signals from the listed neighbor cells and the unlisted neighbor cells; performing, by the user equipment, a cell search within the stored samples of the received listed and unlisted neighbor cell signals to identify a first unlisted neighbor cell from among the unlisted neighbor cells, the cell search comprising; validating the first unlisted neighbor cell based on a corresponding stored sample from among the stored samples of the received listed and unlisted neighbor cell signals; adding the validated unlisted neighbor cell to the neighboring cell list; and mitigating interference, caused by the validated unlisted neighbor cell, from the stored samples of the received listed and unlisted neighbor cell signals; and repeating, by the user equipment, the cell search for a second unlisted neighbor cell from among the unlisted neighbor cells using the mitigated stored samples. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating a user equipment in an idle mode, comprising:
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receiving, by the user equipment, signals from a serving cell and a plurality of neighbor cells, wherein the plurality of neighbor cells include listed neighbor cells that are listed in a neighboring cell list and unlisted neighbor cells that are unlisted in the neighboring cell list; storing, by the user equipment, samples of the received signals from the listed neighbor cells and the unlisted neighbor cells; performing, by the user equipment, a cell search within the stored samples to identify a first unlisted neighbor cell from among the unlisted neighbor cells, the cell search comprising; validating the first unlisted neighbor cell based on a corresponding stored sample from among the stored samples, wherein the validating comprises measuring a signal strength of the first unlisted neighbor cell; adding the validated unlisted neighbor cell to the neighboring cell list; and mitigating interference, caused by the validated unlisted neighbor cell, from the stored samples; repeating, by the user equipment, the cell search for a second unlisted neighbor cell from among the unlisted neighbor cells using the mitigated stored samples; and using the validated unlisted neighbor cell as a subsequent serving cell based on a measured multipath profile and an associated power level of the validated unlisted neighbor cell.
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12. A user equipment, comprising:
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a receiver configured to receive signals from a serving cell and a plurality of neighbor cells, wherein the plurality of neighbor cells include listed neighbor cells that are listed in a neighboring cell list and unlisted neighbor cells that are unlisted in the neighboring cell list; a memory; and a processor configured to; store, in the memory, samples of the received signals from the listed neighbor cells and the unlisted neighbor cells; perform a cell search within the stored samples of the received listed and unlisted neighbor cell signals to identify a first unlisted neighbor cell from among the unlisted neighbor cells; validate the first unlisted neighbor cell based on a corresponding first stored sample from among the stored samples of the received listed and unlisted neighbor cell signals; add the validated unlisted neighbor cell to the neighboring cell list; mitigate interference caused by the validated unlisted neighbor cell from the stored samples of the received listed and unlisted neighbor cell signals; and perform a second cell search for a second unlisted neighbor cell from among the unlisted neighbor cells using the mitigated stored samples. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification