Dynamic RLM Parameter Signaling for 5G PDCCH Beam Accuracy
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Solution Overview
Problem
Current Radio Link Monitoring (RLM) procedures in 5G/NR are not robust enough, leading to inaccurate in-sync/out-of-sync determinations due to reliance on static parameters, which can result in false radio link failure declarations despite power boosting by the base station.
Innovation Solution
The introduction of dynamic parameters signaled by the base station to the UE, such as traffic to pilot ratio, beamforming gain differences, and beam orientation differences, allows for more accurate radio link quality assessments by correcting measurements based on these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static parameters are used for RLM measurements, then the measurement process is simple, but the accuracy of in-sync/out-of-sync determinations deteriorates
Solution Approach 1:
The patent transforms the static parameter approach into a dynamic one by introducing adjustment parameters that adapt to changing beam conditions. The network signals dynamic adjustment parameters (such as beamforming gain differences, beam orientation differences, and traffic to pilot ratios) that allow the UE to correct RLM measurements based on current PDCCH beam characteristics, thereby improving measurement accuracy while maintaining reasonable system complexity.
Solution Approach 2:
The patent changes the measurement parameters from fixed static values to dynamic adjusted values. By introducing adjustment parameters that modify the relationship between reference signal measurements and PDCCH quality inference, the system achieves more accurate radio link quality assessments that reflect actual PDCCH beam conditions rather than relying on outdated static assumptions.
2Ease of operation
If static parameters are used for RLM, then the system operation is simple, but false radio link failure declarations occur
Solution Approach 1:
The patent implements a feedback mechanism where the network provides adjustment parameters to the UE based on observed PDCCH beam conditions. The UE uses these feedback parameters to correct its RLM measurements, creating a closed-loop system that improves reliability by continuously adapting to changing beam conditions rather than relying on static assumptions that lead to false failure declarations.
Solution Approach 2:
The network performs preliminary actions by signaling adjustment parameters to the UE before RLM measurements are taken. This preliminary provision of correction information allows the UE to accurately assess PDCCH beam quality from the outset, preventing false radio link failure declarations while maintaining operational simplicity.
3Device complexity
If reference signal measurements are used to infer PDCCH quality, then the measurement process is straightforward, but accuracy deteriorates when beams differ
Solution Approach 1:
The patent introduces adjustment parameters as intermediaries between reference signal measurements and PDCCH quality inference. These intermediary parameters act as correction factors that bridge the gap between measuring a reference signal (SS/CSI-RS) and inferring the actual PDCCH beam quality, accounting for differences in beamforming gain, orientation, and other beam-specific characteristics.
Data Source
AI summary
In order to provide a more robust RLM procedure for 5G/NR, a base station may provide a dynamic relationship between a PDCCH and another reference signal (e.g., SS/CSI-RS) to a UE. For example, an apparatus may receive an adjustment parameter regarding a PDCCH from a base station. The adjustment parameter may comprise a relationship between the PDCCH and the at least one of the SS or the CSI-RS for deriving a radio link quality of a hypothetical PDCCH. The apparatus may receive an SS/CSI-RS that is QCL with the PDCCH and perform a radio link measurement based on the received at least one of the SS or the CSI-RS using the adjustment parameter regarding the PDCCH. Among other relationships/offsets, the adjustment parameter may indicate a TPR difference, a beamforming gain difference, a beam width difference, a beam orientation difference.