NR-U SSB Measurement with QCL-Based Partial Detection
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Solution Overview
Problem
In NR-U systems, the increased complexity and power consumption of user equipment (UE) in performing SSB measurements due to limited SSB transmission and varying SSB time domain positions, along with reduced accuracy and reliability of mobility management, are exacerbated by Listen Before Talk (LBT) mechanisms.
Innovation Solution
An SSB-based measurement method and apparatus that utilizes quasi-co-location (QCL) relationships, SSB transmission restrictions, and detection results to improve measurement accuracy and reduce complexity and power consumption by obtaining and reporting measurement information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of candidate SSB time domain positions is increased to ensure cell coverage in NR-U systems, then coverage reliability is improved, but UE measurement complexity and power consumption increase
Solution Approach 1:
The patent segments SSBs into multiple groups (first group and second group) with different QCL relationships and transmission restrictions. The UE is configured to measure only specific groups based on indication information, dividing the measurement task into manageable segments rather than requiring measurement of all candidate SSB positions.
Solution Approach 2:
The patent implements partial measurement action by allowing the UE to measure only a subset of SSB groups that are indicated by the network. The network can indicate measurement of only the first group, only the second group, or both groups, enabling the UE to perform partial measurements rather than exhaustive measurements of all candidate positions.
2Measurement precision
If the UE measures all candidate SSB time domain positions to ensure accurate measurement results, then measurement accuracy is improved, but power consumption increases
Solution Approach 1:
The patent segments SSBs into multiple groups with different QCL relationships. The UE measures only the indicated group(s) rather than all candidate SSB positions, segmenting the measurement process to reduce energy consumption while maintaining accuracy for the selected groups.
Solution Approach 2:
The patent enables partial measurement by allowing the UE to measure only specific SSB groups indicated by the network. This partial action approach reduces power consumption by avoiding measurements of non-indicated groups while maintaining measurement accuracy for the indicated groups through proper QCL relationship configuration.
3Device complexity
If SSB transmission restrictions are imposed to reduce UE measurement burden, then UE complexity is reduced, but measurement reliability may deteriorate
Solution Approach 1:
The patent segments SSBs into multiple groups with different transmission restrictions and QCL relationships. By indicating specific groups for measurement, the network reduces UE complexity while maintaining reliability through proper segmentation that ensures critical measurement information is included in the indicated groups.
Solution Approach 2:
The patent implements partial measurement action by allowing the UE to measure only indicated SSB groups. This reduces UE measurement complexity and power consumption while maintaining mobility management reliability through network-controlled indication that ensures essential measurement data is captured in the selected groups.
Data Source
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.