UE Beam Failure Detection via SSB and CSI-RS Signal Monitoring
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Solution Overview
Problem
Existing wireless communication systems face challenges in reliably detecting beam failures, which can lead to disruptions in communication quality and connectivity, particularly in environments with multiple beams and varying signal conditions.
Innovation Solution
User equipment (UE) devices are equipped with mechanisms to perform beam failure detection by receiving indications of specific downlink reference signals, such as synchronization signal blocks (SSB) and channel state information reference signals (CSI-RS), to assess signal quality and determine beam failure, enabling proactive management of communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs signal quality measurements using multiple types of downlink reference signals, then the reliability of beam failure detection is improved, but the device complexity and measurement overhead increase
Solution Approach 1:
The patent segments the downlink reference signals into multiple types (e.g., CSI-RS and SSB) and configures different beam failure detection mechanisms for each type. The UE performs measurements on each reference signal type separately using dedicated measurement resources and thresholds, allowing reliable detection while organizing the complexity into manageable segments rather than handling all signals uniformly
Solution Approach 2:
The base station pre-configures the UE with multiple types of downlink reference signals and their corresponding measurement parameters before beam failure detection is needed. This preliminary configuration includes setting up measurement resources, thresholds, and association relationships between reference signals and beams, so that when beam failure detection is required, the UE can immediately perform measurements without complex real-time configuration
2Speed
If the UE continuously monitors signal quality using configured reference signals, then the responsiveness to beam failure is improved, but the energy consumption increases
Solution Approach 1:
The patent implements periodic beam failure detection where the UE monitors signal quality at configured intervals rather than continuously. The base station configures measurement periods and thresholds, allowing the UE to perform measurements periodically using downlink reference signals. This periodic approach maintains detection responsiveness while significantly reducing energy consumption compared to continuous monitoring
Solution Approach 2:
The UE autonomously determines beam failure based on pre-configured thresholds and measurement results without requiring continuous network control. The network provides the configuration and thresholds in advance, and the UE independently performs measurements, compares results against thresholds, and declares beam failure when conditions are met, reducing the need for continuous network-UE coordination and associated energy overhead
Data Source
AI summary
Embodiments are presented herein of apparatuses, systems, and methods for a user equipment device (UE) to perform beam failure detection. The UE may establish communication with a base station. The UE may determine one or more beams to perform downlink communication from the base station. The UE may receive, from the base station, an indication of a first type of downlink reference signals to perform beam failure detection. The UE may perform signal quality measurements for the one or more beams using the first type of downlink reference signals. The UE may determine beam failure of at least one beam of the one or more beams based on said performing signal quality measurements.