UE Event-Driven Beam Reporting for Low-Latency Failure Detection
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Solution Overview
Problem
Existing wireless communication systems lack efficient mechanisms for UE-initiated, event-driven measurement and reporting, particularly in 5G/NR systems, which can lead to increased latency and reduced reliability due to inadequate knowledge of downlink channel conditions, especially in scenarios like beam failure or rapid quality degradation.
Innovation Solution
Implementing a UE-initiated beam management framework that allows user equipment (UE) to autonomously trigger reports and beam switching based on predefined rules, network configurations, or UE capabilities, using various uplink channels to enhance latency and reliability by enabling timely and reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for network-initiated measurement requests, then the system maintains simpler control signaling, but the latency increases and reliability decreases due to delayed beam failure detection
Solution Approach 1:
The UE performs measurements and evaluates events in advance based on configured thresholds and conditions, preparing beam reports before the network explicitly requests them. This preliminary action enables the UE to detect beam failures proactively and trigger recovery procedures without waiting for network-initiated measurement requests, thereby reducing detection latency and improving reliability.
2Loss of time
If the UE autonomously triggers beam reports based on event-driven measurements, then the latency is reduced and reliability is improved, but the device complexity and processing requirements increase
Solution Approach 1:
The network configures the UE with specific parameters including event thresholds, measurement object configurations, and reporting conditions. The UE uses these pre-configured parameters to evaluate measurements and determine when events occur, triggering beam reports autonomously. This approach reduces latency while managing complexity by relying on pre-configured parameters rather than requiring complex real-time decision-making algorithms.
3Measurement precision
If the network uses traditional periodic measurement reporting, then the signaling overhead is reduced, but the measurement precision and responsiveness to rapid quality degradation decrease
Solution Approach 1:
The event-driven reporting mechanism extracts and reports only those measurements that meet specific triggering conditions, such as when quality metrics cross configured thresholds or when beam failures are detected. Instead of reporting all periodic measurements, the system extracts and transmits only the critical event-driven reports, thereby improving measurement precision and responsiveness while reducing signaling overhead and energy consumption.
Data Source
AI summary
Methods and apparatuses for event-driven measurement and reporting. A method performed by a user equipment (UE) includes receiving first information related to an event for triggering a beam report, receiving a set of one or more periodic reference signals (RSs) for event evaluation, and receiving second information related to the beam report. The method further includes obtaining one or more quality metrics based on measurement of the one or more periodic RSs, determining the event based on the first information and the one or more quality metrics, determining, based on the determination of the event and the second information, and transmitting the beam report. The beam report indicates at least one quality metric from the one or more quality metrics. The one or more quality metrics are associated with the event.