HARQ-State Radio Link Monitoring for Beam and Link Failure Detection
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Solution Overview
Problem
In non-terrestrial networks (NTNs), disabling hybrid automatic repeat request (HARQ) processes to increase data throughput leads to difficulties in determining radio link failure and beam failure due to the absence of HARQ feedback.
Innovation Solution
Implementing multiple radio link monitoring configurations, including one for durations when HARQ is enabled and another for durations when HARQ is disabled, with more stringent block error rate (BLER) thresholds, to efficiently determine radio link and beam failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ processes are disabled to increase data throughput, then data throughput is improved, but radio link failure and beam failure detection becomes difficult
Solution Approach 1:
The patent changes the parameter of BLER thresholds based on HARQ state. When HARQ is disabled, the patent applies more stringent BLER thresholds (e.g., 0.1% instead of 1%) for failure detection. This parameter adaptation allows the system to maintain reliable failure detection despite the absence of HARQ feedback, resolving the contradiction between throughput improvement and detection reliability.
Solution Approach 2:
The patent dynamically selects between different radio link monitoring configurations based on whether HARQ processes are enabled or disabled. The UE transitions between configuration sets with different BLER thresholds according to the operational state, enabling the system to adapt to changing conditions and maintain both high throughput and accurate failure detection.
2Measurement precision
If multiple radio link monitoring configurations are implemented, then failure detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the radio link monitoring configurations into distinct sets: a first set for when HARQ is enabled and a second set for when HARQ is disabled. Each set contains configurations with specific BLER thresholds appropriate for that operational state. This segmentation organizes the complexity into manageable, context-specific configurations rather than a single complex unified system.
Solution Approach 2:
The patent applies local quality by tailoring specific BLER threshold values to specific operational contexts. Instead of using a universal threshold, the system locally adapts the threshold based on whether HARQ is enabled or disabled, ensuring optimal detection performance for each specific condition while maintaining overall system simplicity.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. In some networks, a user equipment (UE) may perform radio link monitoring according to one or more radio link monitoring configurations. The UE may select a radio link monitoring configuration from a first radio link monitoring configuration associated with radio link monitoring over a duration that a hybrid automatic repeat request (HARQ) process is enabled and a second radio link monitoring configuration associated with radio link monitoring over a duration that the HARQ process is disabled. The UE may monitor reference signals using the selected radio link monitoring configuration, and may determine a radio link failure, a beam failure, or both has occurred based on monitoring the one or more reference signals using the selected radio link monitoring configuration. The UE may subsequently transmit a measurement report based on determining the radio link failure, the beam failure, or both.