Radio Link Monitoring Relaxation for Wireless Devices
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Solution Overview
Problem
Current wireless systems face challenges in efficiently managing radio link monitoring (RLM) and beam failure detection (BFD) due to the need for continuous and resource-intensive measurements, which can lead to increased power consumption and network overhead.
Innovation Solution
The proposal involves relaxing RLM/BFD requirements by allowing wireless transmit/receive units (WTRUs) to dynamically enable or disable measurement reporting based on predefined criteria, using MAC CE or L1 signaling for uplink reporting, and adjusting measurement periodicity based on the WTRU's measurement relaxation state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous radio link monitoring and beam failure detection measurements are performed, then reliability of connection is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic measurement relaxation where the WTRU alternates between normal measurement mode and relaxed measurement mode. During relaxed mode, measurement periodicity is increased (measurements performed less frequently), reducing power consumption while maintaining connection reliability through periodic resumption of normal measurements. The relaxation is triggered by criteria such as good channel quality and low mobility, ensuring reliability is maintained when conditions permit.
2Reliability
If continuous radio link monitoring measurements are performed, then connection reliability is improved, but network overhead increases
Solution Approach 1:
The patent reduces network overhead by implementing periodic measurement relaxation where measurement reporting is suspended or reduced in frequency during relaxed mode. The WTRU only resumes normal measurement reporting when relaxation criteria are no longer met, thereby reducing the quantity of measurement reports transmitted to the network while maintaining connection reliability through conditional monitoring.
3Use of energy by moving object
If measurement periodicity is increased during relaxation, then power consumption is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent dynamically changes measurement parameters (periodicity and state) based on radio link quality conditions. When channel quality is good and mobility is low, the WTRU transitions to relaxed mode with increased measurement periodicity. When conditions deteriorate (channel quality worsens or mobility increases), the WTRU returns to normal mode with standard measurement periodicity, thereby maintaining measurement precision when needed while reducing power consumption when conditions permit.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may comprise a processor and memory. The processor and memory may be configured to receive configuration information indicating measurement relaxation criteria for radio link monitoring (RLM) or beam failure detection (BFD) and a prohibit time period for reporting a measurement relaxation state. The WTRU may determine that the measurement relaxation state of the WTRU has changed based on the measurement relaxation criteria. The WTRU may determine that the prohibit time period has ended. The WTRU may send a report based on the determination that the measurement relaxation state has changed and the determination that the prohibit time period has ended. The report may include an indication of a measurement relaxation state.