SSB Measurement Using QCL for Low-Power NR-U Mobility
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Solution Overview
Problem
In NR-U systems, the increased complexity and power consumption of UE measurements due to varying candidate SSB time domain positions and limited SSB transmissions affect the accuracy and reliability of mobility management.
Innovation Solution
An SSB-based measurement method that utilizes quasi-co-location (QCL) relationships and SSB transmission restrictions to improve measurement accuracy and reduce complexity and power consumption by obtaining first measurement results and generating corresponding measurement information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE measures multiple cells with varying candidate SSB time domain positions and limited SSB transmissions, then the coverage and adaptability are improved, but the measurement complexity and power consumption increase
Solution Approach 1:
The patent divides the measurement process into two distinct parts: intra-frequency measurements using a first measurement configuration and inter-frequency measurements using a second measurement configuration. This segmentation allows the UE to handle different measurement scenarios with dedicated configurations, reducing overall complexity while maintaining adaptability for various cell types and SSB transmission patterns
Solution Approach 2:
The patent introduces dynamic measurement windows (first measurement window and second measurement window) that are configured separately for different frequency bands and SSB periodicities. These windows can be adjusted based on the specific measurement requirements of each cell, enabling the system to adapt to varying SSB transmission patterns without requiring the UE to continuously monitor all possible positions
2Adaptability or versatility
If the UE measures multiple cells with varying candidate SSB time domain positions and limited SSB transmissions, then the coverage and adaptability are improved, but the power consumption increases
Solution Approach 1:
The patent segments power consumption into two distinct measurement modes: intra-frequency measurement power and inter-frequency measurement power. Each mode has its own measurement configuration and window settings, allowing the UE to optimize power usage for each scenario separately rather than using a single high-power configuration for all measurements
Solution Approach 2:
The patent implements periodic measurement windows that are activated only when needed for specific inter-frequency measurements. The second measurement configuration with its dedicated measurement window allows the UE to enter low-power states between measurement occasions, reducing overall power consumption while maintaining the ability to measure cells with limited SSB transmissions
3Ease of operation
If the UE performs measurement based on predefined SSB time domain positions, then the measurement process is simplified, but the measurement accuracy decreases due to mismatched SSB positions
Solution Approach 1:
The patent makes the measurement process dynamic by configuring separate measurement windows that adapt to the actual SSB transmission patterns of target cells. The second measurement configuration allows the UE to adjust measurement timing based on inter-frequency SSB periodicities, ensuring measurements are performed at the correct SSB positions without requiring complex predefined position matching
Solution Approach 2:
The patent introduces measurement configurations (first measurement configuration and second measurement configuration) as intermediary elements that bridge the gap between the UE and target cells. These configurations contain the necessary timing and frequency information to accurately locate SSBs without requiring the UE to search through multiple predefined positions, thus maintaining simplicity while improving accuracy
Data Source
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AI summary
An SSB-based measurement method and apparatus, in which a first measurement result of a first cell is obtained according to at least one of QCL relationships between SSBs to which the first cell corresponds, an SSB transmission restriction to which the first cell corresponds and a detection result of SSBs of the first cell, and measurement information of the first cell is generated according to the first measurement result of the first cell and reported, thereby lowering complexity and power consumption of the SSB-based measurement.