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US 9,432,922 B1Granted
System and method for cell search enhancement in an LTE system
AssigneeSamsung Electronics Co., Ltd.
InventorsKee-bong Song, Shengshan Cui, Hairuo Zhuang, Yangwen Liang, Vignesh Sethuraman
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Abstract
Apparatuses (including user equipment (UE) and modem chips for UE), systems, and methods for reducing false alarms (FAs) and miss-detections (MDs) in cell search results are described. In one method, the minimum of a value for the accumulated metric for a first short code and a value for the accumulated metric for a second short code is used as a pruning metric for each candidate cell. One or more thresholds are applied to the pruning metric to determine whether the candidate cell will be pruned from the final candidate cell list.
Claims20
A method, comprising:
- performing a search for cells whose signals can be received by a user equipment (UE);
- generating a preliminary candidate cell list comprising measurements for each candidate cell, if any, wherein the measurements result from the search for cells and comprise a metric for a first short code and a metric for a second short code, wherein a physical layer cell identity group for a cell is generated from the first and second short codes;
- checking a candidate cell database for a candidate cell record matching each candidate cell in the preliminary candidate cell list, wherein each candidate cell record comprises accumulated measurements of a candidate cell;
- updating the matching candidate cell record based on a candidate cell record matching a candidate cell in the preliminary candidate cell list, by combining the measurements of the corresponding cell candidate in the preliminary candidate cell list with the accumulated measurements in the matching candidate cell record;
- generating a new candidate cell record for the candidate cell with the measurements of the cell candidate from the preliminary candidate cell list based on a candidate cell record not matching a candidate cell in the preliminary candidate cell list;
- and
- generating a pruning metric for each candidate cell based on the accumulated measurements in its candidate cell record, wherein the pruning metric comprises the minimum of a value for the accumulated metric for the first short code and a value for the accumulated metric for the second short code.
4 more elements
A user equipment (UE), comprising:
- one or more non-transitory computer-readable media, wherein at least one of the one or more non-transitory computer-readable media stores a set of instructions;
- and
- one or more processors, wherein at least one of the one or more processors, when executing the set of instructions stored in the at least one of the one or more non-transitory computer-readable media, controls the UE to perform at least the following steps:
- performing a search for cells whose signals can be received by the UE;
- generating a preliminary candidate cell list comprising measurements for each candidate cell, if any, wherein the measurements result from the search for cells and comprise a metric for a first short code and a metric for a second short code, wherein a physical layer cell identity group for a cell is generated from the first and second short codes;
- checking a candidate cell database for a candidate cell record matching each candidate cell in the preliminary candidate cell list, wherein each candidate cell record comprises accumulated measurements of a candidate cell;
- updating the matching candidate cell record based on a candidate cell record matching a candidate cell in the preliminary candidate cell list, by combining the measurements of the corresponding cell candidate in the preliminary candidate cell list with the accumulated measurements in the matching candidate cell record;
- generating a new candidate cell record for the candidate cell with the measurements of the cell candidate from the preliminary candidate cell list based on a candidate cell record not matching a candidate cell in the preliminary candidate cell list;
- and
- generating a pruning metric for each candidate cell based on the accumulated measurements in its candidate cell record, wherein the pruning metric comprises the minimum of a value for the accumulated metric for the first short code and a value for the accumulated metric for the second short code.
7 more elements
A user equipment (UE), comprising:
- one or more antennas;
- and
- a modem chip which:
- performs a search for cells whose signals can be received by the UE;
- generates a preliminary candidate cell list comprising measurements for each candidate cell, if any, wherein the measurements result from the search for cells and comprise a metric for a first short code and a metric for a second short code, wherein a physical layer cell identity group for a cell is generated from the first and second short codes;
- checks a candidate cell database for a candidate cell record matching each candidate cell in the preliminary candidate cell list, wherein each candidate cell record comprises accumulated measurements of a candidate cell;
- updates the matching candidate cell record based on a candidate cell record matching a candidate cell in the preliminary candidate cell list, by combining the measurements of the corresponding cell candidate in the preliminary candidate cell list with the accumulated measurements in the matching candidate cell record;
- generates a new candidate cell record for the candidate cell with the measurements of the cell candidate from the preliminary candidate cell list based on a candidate cell record not matching a candidate cell in the preliminary candidate cell list;
- and
- generates a pruning metric for each candidate cell based on the accumulated measurements in its candidate cell record, wherein the pruning metric comprises the minimum of a value for the accumulated metric for the first short code and a value for the accumulated metric for the second short code.
7 more elements
Dependencies are inferred from the claim text.