UE Beam Reporting Triggered by CSI Event Detection
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Solution Overview
Problem
Existing wireless communication systems lack efficient mechanisms for UE-initiated, event-driven beam reporting, particularly in 5G/NR systems, leading to increased latency and potential beam failure due to inadequate knowledge of DL channel conditions by the network.
Innovation Solution
Implementing a UE-initiated/event-driven beam management framework that allows user equipment (UE) to autonomously detect events and trigger beam reporting through various uplink channels, using customized report formats and configurations, and specifying conditions for different events to minimize latency and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network relies on periodic beam reporting from UE, then beam management is maintained, but latency increases and beam failure may occur due to inadequate knowledge of DL channel conditions
Solution Approach 1:
The UE performs measurements and detects beam failure events in advance before reporting to the network. The UE monitors DL channel conditions continuously and triggers reporting only when predefined failure conditions are met, allowing proactive beam management rather than waiting for periodic reporting intervals.
Solution Approach 2:
The UE autonomously determines when beam failure events occur based on pre-configured criteria and initiates reporting without network intervention. The UE self-manages the detection and reporting process, reducing dependency on network-scheduled periodic reporting and minimizing latency.
2Loss of time
If the UE autonomously triggers beam reporting based on event detection, then latency is reduced and beam failure is prevented, but system complexity increases due to UE-initiated reporting mechanisms
Solution Approach 1:
The network configures the UE with specific parameters including measurement thresholds, event triggering conditions, and reporting formats. By changing and optimizing these parameters, the system enables autonomous UE reporting without requiring complex centralized control, balancing automation with manageable complexity.
Solution Approach 2:
The UE provides feedback to the network about DL channel conditions and beam failure events based on autonomous detection. This feedback mechanism allows the network to maintain beam management control while leveraging UE autonomy, reducing latency without requiring the network to implement complex detection algorithms.
3Measurement precision
If multiple RS resources are monitored for event detection, then beam failure detection accuracy is improved, but processing complexity and energy consumption increase
Solution Approach 1:
The UE divides the beam failure detection process into separate measurement stages for different RS resources. The UE monitors multiple reference signals independently and combines their measurements to determine overall beam failure conditions, improving detection accuracy while managing processing complexity through structured segmentation.
Solution Approach 2:
The UE monitors multiple RS resources beyond the minimum single resource, providing excess measurement capability that improves detection accuracy. The UE processes only the necessary subset of measurements needed to meet detection requirements, avoiding unnecessary processing of all available RS resources and reducing energy consumption.
Data Source
AI summary
Methods and apparatuses for triggering beam reporting based on event detection. A method performed by a user equipment (UE) includes receiving one or more transmission configuration indication (TCI) states, receiving information related to an event in a channel state information (CSI) report configuration for UE-initiated (UEI) reporting, and determining a first reference signal (RS) resource based on the one or more TCI states and the information. The method further includes determining one or more second RS resources based on the CSI report configuration, monitoring transmission occasions (TOs) of the first RS resource and the one or more second RS resources, and determining the event based on layer-1 reference signal received powers (L1-RSRPs) of the TOs and the information.