User Terminal Synchronization Signal Detection for Power Reduction
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Solution Overview
Problem
User terminals face increased battery consumption when detecting synchronizing timings from multiple small cells in radio communication systems using Discovery Reference Signals (DRS), leading to a significant burden on the device.
Innovation Solution
Implementing a user terminal with a control section that selectively detects synchronization signals based on the strongest PSS/SSS timing and utilizing synchronized sets to determine CSI-RS detection timings, reducing the need for repeated measurements across multiple synchronizing timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the user terminal detects synchronizing timings from multiple small cells, then the cell detection capability is improved, but the battery consumption increases significantly
Solution Approach 1:
The patent extracts only the necessary synchronization timing information from multiple small cells. Instead of processing all detected synchronizing timings, the terminal selectively uses timing information from a subset of cells (e.g., the strongest signal or predetermined cell), thereby reducing measurement burden and power consumption while maintaining adequate cell detection capability.
Solution Approach 2:
The patent applies partial action by performing CSI-RS detection at only certain synchronizing timings rather than all detected timings. The terminal may skip detection at weaker or less critical cell timings, achieving acceptable measurement precision with reduced energy expenditure.
2Measurement precision
If the user terminal performs CSI-RS detection at all detected synchronizing timings, then the measurement completeness is improved, but the device burden increases
Solution Approach 1:
The patent extracts and processes only the essential synchronization timing information needed for CSI-RS detection. By identifying and filtering out redundant or less critical synchronizing timings, the terminal reduces the number of measurements required while maintaining measurement completeness for the most important cells.
Solution Approach 2:
The patent segments the set of all detected synchronizing timings into priority groups. The terminal performs CSI-RS detection first on high-priority timings (e.g., strongest signals), and may optionally skip or defer low-priority timings, thereby reducing device burden while preserving measurement completeness for critical cells.
Data Source
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AI summary
The present invention is designed to reduce the increase of power consumption in user terminals in a radio communication system in which small cells are detected by using DRSs. A user terminal, according to one aspect of the present invention, is capable of communicating with radio base stations that form cells, and has a receiving section that receives detection/measurement signals that are transmitted respectively from a plurality of cells. a control section that controls the synchronization signals included in the received detection/measurement signals, and a receiving process section that measures the channel state measurement signals included in the received detection/measurement signals based on the selected synchronization signal.