User Equipment RLM Measurement Optimization via Beam Sweeping
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Solution Overview
Problem
In fifth-generation (5G) mobile communication, user equipment (UE) operating in the FR2 band faces inefficiencies in radio link monitoring (RLM) measurements due to the lack of consideration for the number of reception beams and beam sweeping in existing measurement requirements, leading to suboptimal performance.
Innovation Solution
A method is introduced where the UE performs RLM measurements based on RLM-reference signals (RLM-RS) included in the SSB, with different evaluation periods depending on whether the SSB is quasi-co-located with CSI-RS resources, and determines the number of best beams through beam sweeping, allowing for efficient RLM measurements by adjusting the number of reception beams used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs RLM measurement using a plurality of reception beams with beam sweeping, then the transmission and reception performance is improved, but the measurement time and complexity increase
Solution Approach 1:
The UE performs beam sweeping and identifies the best beam in advance before conducting RLM measurements. By pre-determining the optimal reception beam through preliminary beam sweeping operations, the UE avoids repeated beam searching during RLM, thereby reducing measurement time while maintaining reliable performance monitoring
Solution Approach 2:
The RLM measurement process is divided into separate phases: beam sweeping phase for identifying the best beam, and measurement phase for actual RLM using the selected beam. This segmentation allows the system to optimize each phase independently, reducing overall measurement time while maintaining measurement accuracy
2Measurement precision
If the UE uses a plurality of reception beams for RLM measurement, then the measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
Instead of continuously managing all available reception beams, the UE performs beam sweeping once and selects only the necessary number of best beams (e.g., top 1-3 beams) for RLM measurements. This partial action approach maintains measurement accuracy by using the best beams while significantly reducing the complexity of beam management
Solution Approach 2:
The UE dynamically adjusts the number of beams used for RLM based on channel conditions and performance requirements. By changing the parameter of beam quantity adaptively, the system maintains high measurement precision when needed while reducing complexity under normal conditions
Data Source
AI summary
One disclosure of the present specification provides a method by which user equipment (UE) performs a measurement. The method comprises the steps of: receiving, from a serving cell, a synchronization signal (SS)/physical broadcast channel (PBCH) block (SSB), wherein the SSB is used for radio link monitoring (RLM); and performing an RLM measurement on the basis of an RLM-reference signal (RLM-RS) included in the SSB, wherein, if the SSB is quasi-co-located (QCL) with respect to a channel-state information (CSI) reference signal (CSI-RS) resource, the RLM measurement is performed during a first evaluation period on the basis of a first value and, if the SSB is not QCL with respect to the CSI-RS resource, the RLM measurement is performed during a second evaluation period on the basis of a second value, and the first evaluation period is smaller than the second evaluation period.