User Equipment RLF Detection in Multi-Beam Wireless Systems
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in determining and managing cell-level and beam-level radio link failures (RLF) when a base station operates multiple analog beams, which affects the stability and efficiency of user equipment (UE) operations.
Innovation Solution
The proposed method involves a UE that determines cell-level and beam-level RLF by analyzing signal strengths and performs specific operations such as RRC connection re-establishment, serving beam re-establishment, or beam recovery based on the determined failures, using cell-specific and beam-specific signals and applying beam sweeping operations to maintain and optimize link quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a base station operates multiple analog beams to improve coverage and capacity, then the system can support more users and enhance signal quality, but it becomes difficult to determine whether cell-level or beam-level radio link failure has occurred
Solution Approach 1:
The patent divides radio link failure determination into two separate levels: cell-level RLF and beam-level RLF. Cell-level RLF is determined based on cell-specific reference signals, while beam-level RLF is determined based on beam-specific reference signals. This segmentation allows the system to handle multi-beam operations while maintaining clear failure detection mechanisms for each level independently.
2Reliability
If the UE performs RRC connection re-establishment procedure to recover from cell-level RLF, then connection reliability is improved, but communication interruption and latency increase
Solution Approach 1:
The patent enables the UE to perform beam-level recovery procedures as a preliminary action before cell-level RLF occurs. When beam-level RLF is detected, the UE can attempt beam recovery using remaining good beams, which may resolve the issue without requiring full RRC connection re-establishment. This preliminary beam-level recovery action reduces communication interruption time while maintaining connection reliability.
3Measurement precision
If the UE continuously monitors both cell-specific and beam-specific signals to detect RLF, then detection precision is improved, but power consumption and processing complexity increase
Solution Approach 1:
The patent segments the monitoring process into two independent monitoring tasks: one for cell-specific reference signals and another for beam-specific reference signals. The UE can monitor cell-level quality using cell-specific signals and beam-level quality using beam-specific signals separately. This segmentation allows efficient power management where the UE can adjust monitoring intensity based on which level shows degradation, reducing overall power consumption while maintaining high detection precision.
Data Source
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AI summary
Disclosed are a method whereby user equipment operates in a wireless communication system, and a device for supporting same. Disclosed more particularly are: a method whereby, in case a base station which operates multiple analogue beams is connected to user equipment, the user equipment determines a cell-level radio link failure (RLF) and a beam-level RLF through signal transmission and reception to and from the base station and carries out an operation based on the determination; and a device for supporting said method.