UE Cell Measurement Filtering for Power Savings
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Solution Overview
Problem
In the New Radio (NR) system, User Equipment (UE) needs to measure all cells during mobility management, but some cells may be far away, leading to unnecessary measurements that affect performance and increase power consumption.
Innovation Solution
A cell measurement method where the UE determines a second cell from a list of first cells to stop measuring, using threshold and timing configurations to identify cells that do not need to be measured, thereby reducing unnecessary measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE measures all cells in the configured list during mobility management, then the measurement completeness is improved, but the power consumption increases and measurement performance deteriorates due to unnecessary measurements of distant cells
Solution Approach 1:
The patent extracts and removes unnecessary measurement objects (distant cells that cannot be handover targets) from the measurement list. The UE determines the distance to each cell in the configured list, identifies cells that are too distant to be potential handover targets, and stops measuring those cells, thereby reducing power consumption while maintaining measurement effectiveness for relevant cells
Solution Approach 2:
Instead of measuring all cells in the configured list (excessive action), the patent applies partial measurement by selectively measuring only those cells that are within a feasible handover distance. The UE calculates distance metrics and compares them against thresholds to determine which cells require measurement, avoiding wasted resources on distant cells
2Measurement precision
If the UE measures all cells in the configured list during mobility management, then the measurement completeness is improved, but the mobility management performance deteriorates due to unnecessary measurements
Solution Approach 1:
The patent removes irrelevant measurement targets (distant cells) from the measurement process. By calculating the distance between the UE and each cell in the configured list, the system identifies and excludes cells that are too far to be potential handover targets, thereby improving mobility management performance by focusing measurements on relevant cells only
Solution Approach 2:
The patent introduces distance as a new parameter for filtering measurement targets. By calculating distance metrics (such as geometric distance or path loss) and comparing them against threshold values, the system dynamically adjusts the measurement set based on spatial parameters, improving efficiency without sacrificing measurement completeness for relevant cells
3Use of energy by moving object
If the UE stops measuring distant cells, then the power consumption is reduced, but the measurement completeness may deteriorate if relevant cells are incorrectly excluded
Solution Approach 1:
The patent implements a feedback mechanism where the UE continuously monitors measurement results and distance metrics. If a cell initially excluded due to distance becomes a potential target (e.g., UE movement changes the distance relationship), the system can re-evaluate and resume measurements, ensuring that no relevant cells are permanently excluded while maintaining power savings for clearly distant cells
Solution Approach 2:
The patent performs preliminary distance calculations and threshold comparisons before initiating measurements. By pre-filtering the cell list based on distance criteria, the system identifies cells that are unlikely to be handover targets and excludes them from measurement, reducing power consumption while maintaining measurement completeness for cells that pass the preliminary distance check
Data Source
AI summary
A cell measurement method, performed by a user equipment (UE), includes: determining a second cell from a plurality of first cells, wherein the plurality of first cells are cells to be measured for the UE to perform mobility management, the second cell is selected from the plurality of first cells, and measurement of the second cell is to be stopped; and stopping the measurement of the second cell.