Beam Management Filtering for NR Ping-Pong Reduction
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Solution Overview
Problem
Beam management in New Radio (NR) experiences ping-pong effects due to the lack of time filtering when using aperiodic and semi-persistent CSI-RS resources, leading to unnecessary overhead signaling and sub-optimal beam selections.
Innovation Solution
Implementing a method where the UE receives reference signals from multiple TRP TX beams, performs measurements, and filters these results using a measurement result filtering indicator (MRFI) to derive a filtered measurement result, which is then used to select a beam, thereby reducing the probability of ping-pong effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If aperiodic and semi-persistent CSI-RS resources are used for beam management, then beam adaptability and responsiveness to channel changes are improved, but measurement reliability deteriorates due to lack of time filtering causing ping-pong effects
Solution Approach 1:
The patent applies preliminary action by pre-configuring time filtering parameters and measurement result filtering indicators (MRFI) before beam measurements are performed. The network configures the UE with filtering parameters in advance, and the UE applies these filters to measurement results before beam selection, preventing ping-pong effects proactively rather than reactively.
Solution Approach 2:
The patent implements feedback mechanisms where the network provides MRFI indicators to the UE based on previous measurement results and beam selection history. This feedback loop allows the system to adjust filtering behavior dynamically, improving measurement reliability while maintaining beam adaptability through continuous optimization based on past performance.
2Measurement precision
If frequent beam measurements are performed to track UE movements, then beam selection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential measurement information by applying time filtering to measurement results before reporting. Instead of reporting all raw measurement data, the UE reports filtered measurement results that have had transient fluctuations removed, extracting only the stable, significant beam selection information while discarding redundant data that would increase signaling overhead.
Solution Approach 2:
The patent changes the state of measurement results by applying time filtering parameters (such as filtering factors and time windows) to transform raw measurements into stabilized values. This parameter transformation reduces the variability of reported measurements, improving beam selection accuracy while reducing the amount of signaling needed to convey stable beam information.
3Stability of the object's composition
If multiple beam sweeps are performed to ensure comprehensive beam coverage, then beam management stability is improved, but measurement processing complexity increases
Solution Approach 1:
The patent merges multiple measurement results from different beam sweeps by applying time filtering that combines historical measurement data with current measurements. This merging process stabilizes beam management decisions by considering trends across multiple sweeps rather than relying on single-sweep results, while the filtering framework simplifies the overall processing complexity through systematic combination rules.
Data Source
AI summary
An exemplary method provides for a user equipment (UE) receiving a first reference signal (RS) that was transmitted by a base station using a first transmit beam. The UE performs a first RS measurement with respect to the received first RS, producing a first measurement result. The UE receives a second RS that was transmitted by the base station using the first transmit beam. The UE performs a second RS measurement with respect to the received second RS, producing a second measurement result. The UE determines that a condition is satisfied based on determining that the base station has transmitted to the UE a measurement result filtering indicator indicating that the UE may filter its first and second measurement results. The UE derives a filtered measurement result based on the first measurement result and the second measurement result, and selects a beam based on the filtered measurement result.