Carrier Aggregation Cell Search Threshold Logic
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Solution Overview
Problem
In communication systems supporting carrier aggregation, determining the timing for cell search and quality measurement is challenging due to the presence of multiple serving cells, which affects power consumption and efficiency.
Innovation Solution
A communication terminal equipped with a quality measurement unit, primary carrier storage, and a comparator that compares the reception quality of a primary carrier to a threshold value to determine when to initiate a cell search, allowing for efficient timing of cell search operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented with multiple component carriers, then throughput is improved, but determining cell search timing becomes complex due to multiple serving cells
Solution Approach 1:
The patent segments the cell search determination process by designating one specific component carrier as the primary component carrier. The cell search timing is determined separately for the primary component carrier versus secondary component carriers, simplifying the overall decision logic while maintaining carrier aggregation functionality.
Solution Approach 2:
The patent introduces an intermediary approach by using the primary component carrier as a reference point for cell search decisions. The quality measurement of the primary component carrier serves as the basis for determining cell search timing, which then applies to the entire carrier aggregation group, reducing the complexity of independent decisions for each carrier.
2Reliability
If cell search is performed frequently to ensure communication quality, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent changes the parameter used for cell search determination from individual component carrier quality to the quality of the primary component carrier. By monitoring the primary component carrier's quality measurement against a threshold, the system determines cell search timing, reducing the frequency of searches while maintaining communication reliability.
Solution Approach 2:
The system uses the primary component carrier's quality measurement to automatically determine cell search timing without requiring separate quality assessments for each secondary component carrier. This self-service approach reduces redundant operations and power consumption while maintaining adequate communication quality monitoring.
Data Source
AI summary
A communication terminal is capable of simultaneously communicating through a plurality of carriers by carrier aggregation, and the communication terminal comprises: a quality measurement unit for measuring the reception quality of a radio wave transmitted through a plurality of carriers from a base station of a connected cell to obtain a measured value; a primary carrier storage unit storing information specifying a primary carrier chosen from the plurality of carriers; a comparator for comparing a measured value of the primary carrier measured by the quality measurement unit to a threshold value; and a cell search unit for searching for another cell when the measured value of the primary carrier is less than or equal to the threshold value. Consequently, a search threshold value for carrier aggregation can be appropriately determined to perform a cell search and a quality measurement.