Radio Link Monitoring in NR V2X Sidelink Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink communication between different User Equipments (UEs) due to limitations in radio link monitoring (RLM) and radio link failure (RLF) operations, particularly in scenarios requiring high reliability and low latency, such as vehicle-to-everything (V2X) communications.
Innovation Solution
A method and apparatus for performing wireless communication that involves receiving multiple sidelink control informations (SCIs) through channels, determining the number or ratio of failed channels based on reference signals or SCI sequences, and performing radio link monitoring (RLM) accordingly, enabling efficient sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RLM methods are used in sidelink communication, then the system is simpler to implement, but the reliability and latency performance are insufficient for V2X scenarios
Solution Approach 1:
The patent segments the RLM process into distinct phases: initial RLM using first SCIs, and subsequent RLM using second SCIs. This segmentation allows different monitoring strategies to be applied at different stages, improving reliability without overwhelming complexity. The first RLM phase establishes basic link quality assessment, while the second phase provides enhanced monitoring for critical V2X communications.
Solution Approach 2:
The patent implements dynamic RLM operations where the monitoring behavior adapts based on the communication phase and channel conditions. The system transitions from initial RLM to subsequent RLM dynamically, and can adjust monitoring parameters based on measured link quality. This dynamic approach enables the system to maintain high reliability while managing complexity through adaptive rather than static operations.
2Measurement precision
If multiple SCIs are monitored for RLM, then the measurement precision is improved, but the processing complexity increases
Solution Approach 1:
The patent divides SCI monitoring into two segmented processes: monitoring first SCIs for initial RLM decisions, and monitoring second SCIs for subsequent RLM. This segmentation allows the system to achieve high measurement precision through multiple measurements while managing complexity by processing different SCI sets at different stages rather than simultaneously processing all SCIs continuously.
Solution Approach 2:
The patent performs preliminary RLM assessment using first SCIs before proceeding to more intensive monitoring of second SCIs. This preliminary action establishes a baseline link quality assessment that guides subsequent monitoring intensity, allowing the system to achieve high measurement precision only when necessary, thereby balancing precision with processing complexity.
3Reliability
If RLM is performed continuously, then the reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent implements periodic RLM operations rather than continuous monitoring. The system performs RLM at specific intervals corresponding to SCI transmissions, with distinct periodic patterns for initial RLM (using first SCIs) and subsequent RLM (using second SCIs). This periodic approach maintains reliability by regularly assessing link quality while significantly reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The patent performs preliminary RLM assessment using first SCIs to establish initial link quality status. Based on this preliminary assessment, the system can adjust the intensity and frequency of subsequent RLM operations. If the initial assessment indicates good link quality, subsequent monitoring can be less intensive, thereby maintaining reliability while reducing energy consumption through adaptive periodic action.
Data Source
AI summary
Provided are a method for a first device to perform wireless communication, and a device supporting same. The method may comprise: a step for receiving, from a second device, a plurality of reference signals or N SCIs through N channels; a step for determining, on the basis of at least one among the sequence of the plurality of reference signals and the N SCIs, the number or ratio of channels that have failed in reception; and a step for performing radio link monitoring (RLM) on the basis of the number or ratio of channels that have failed in reception. N may be a positive integer.