User Equipment BWP Switching Reference Signal Control
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Solution Overview
Problem
In future radio communication systems, the process of switching between partial frequency bands (BWP) can lead to degradation of communication quality if not managed properly during radio link monitoring or beam failure detection operations.
Innovation Solution
The solution involves controlling the reference signal operations by discarding the measurement results of the previous BWP configuration after switching, or using the measurement results of the new BWP configuration based on quasi-co-location relationships, to ensure accurate and efficient RLM/BFD operations post-switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If BWP switching is performed to enable flexible frequency band usage, then spectral efficiency and system capacity are improved, but communication quality degradation occurs due to improper reference signal handling during switching
Solution Approach 1:
The patent applies preliminary action by configuring multiple reference signals (first reference signal for first BWP, second reference signal for second BWP) in advance before switching occurs. The UE evaluates these pre-configured reference signals to determine RLM/BFD status before BWP switching takes place, ensuring continuous monitoring capability. This resolves the contradiction by preparing reference signal evaluation infrastructure ahead of time, enabling smooth transitions without communication quality degradation.
2Measurement precision
If reference signals are configured for each BWP to enable accurate RLM/BFD operations, then measurement precision is improved, but device complexity increases due to multiple reference signal configurations
Solution Approach 1:
The patent applies segmentation by dividing the reference signal configuration into separate, manageable components - a first reference signal associated with the first BWP and a second reference signal associated with the second BWP. Each reference signal is independently configured and evaluated, allowing the UE to handle RLM/BFD operations for different BWPs separately. This modular approach improves measurement precision for each BWP while reducing overall system complexity through structured organization.
3Adaptability or versatility
If the UE evaluates measurement results based on current BWP configuration, then adaptability is improved, but loss of time occurs during BWP switching transitions
Solution Approach 1:
The patent applies preliminary action by having the UE evaluate measurement results of the first reference signal before switching to the second BWP. The UE determines the RLM/BFD status based on the first reference signal evaluation in advance, then uses this information during the transition. This ensures that the UE maintains adaptability to different BWPs while minimizing transition time, as the evaluation infrastructure is already in place and operational.
Data Source
Figure 1A~1C
Figure 2
Figure 3A~3B
AI summary
In order to suppress degradation of communication quality even when BWP switching is performed, a user terminal according to an aspect of the present disclosure includes: a receiving section configured to receive a reference signal configured for each bandwidth part (BWP) in a given BWP; and a control section configured to perform control not to use the reference signal of the given BWP for at least one of a radio link monitor operation and a beam failure detection operation in other BWP when switching from the given BWP to the other BWP occurs, or control presence or absence of use of the reference signal of the given BWP based on a relationship between reference signals configured for each of the given BWP and the other BWP.