User Terminal Beam Configuration for Failure Detection
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Solution Overview
Problem
In future radio communication systems, such as 5G and NR, higher frequency bands (3 to 40 GHz) face challenges with coverage due to distance-induced attenuation, leading to beam quality deterioration and frequent Radio Link Failures (RLFs) caused by obstacles, which affects system performance.
Innovation Solution
A user terminal is equipped with a receiving section for downlink control channels and a control section that configures beams for monitoring beam failures and channel state information measurement, enabling proper detection and recovery of beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If beamforming with narrow beams is used in higher frequency bands, then beamforming gain increases and coverage is improved, but beam quality deteriorates due to blockage caused by obstacles
Solution Approach 1:
The patent segments the beam monitoring function into two distinct configurations: one set of beams configured for beam failure monitoring and another set for CSI measurement and reporting. This segmentation allows the system to maintain narrow beams for high gain while using separate monitoring beams to detect quality deterioration independently, resolving the contradiction between beamforming gain and beam quality reliability
Solution Approach 2:
The patent introduces beam failure monitoring as an intermediary mechanism that independently assesses beam quality without affecting the primary beamforming operation. This intermediary monitoring function detects blockage effects separately from the data transmission beams, allowing the system to maintain narrow high-gain beams while having a dedicated quality assessment mechanism that triggers recovery actions when needed
2Length of stationary object
If beamforming is used to reduce propagation loss, then coverage is ensured in high frequency bands, but RLF occurs frequently due to blockage
Solution Approach 1:
The patent implements preliminary beam failure monitoring that continuously assesses beam quality before actual transmission failures occur. By configuring dedicated beams for failure monitoring and establishing failure criteria in advance, the system can detect and respond to blockage conditions before they cause RLF, thus maintaining coverage while preventing performance degradation
Solution Approach 2:
The patent establishes a feedback mechanism where beam failure monitoring results are fed back to trigger beam recovery procedures. The monitoring function continuously provides quality information, and when failure criteria are met, the system responds by initiating recovery actions, creating a closed-loop control system that maintains reliability while preserving coverage benefits
3Measurement precision
If separate beam configurations are used for monitoring and data transmission, then beam failure detection capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by configuring beams that can serve multiple functions: the same beam configuration is used for both beam failure monitoring and CSI measurement/reporting. This multi-functional approach improves detection capability without proportionally increasing complexity, as the system reuses existing beam structures for dual purposes rather than creating entirely separate configurations
Data Source
AI summary
Beam failure detection and/or beam recovery are performed properly. A user terminal according to the present invention has a receiving section that receives a downlink (DL) control channel, and a control section that configures at least part of one or more beams configured for monitoring a beam failure, for monitoring the DL control channel, and the control section configures at least part of one or more beams configured for channel state information (CSI) measurement and/or reporting, for receiving a downlink (DL) data channel.