Inter-cell mTRP Radio Link Monitoring Configuration
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Solution Overview
Problem
The existing Radio Link Monitoring (RLM) systems in New Radio (NR) face challenges in efficiently configuring and managing RLM resources, especially in multi-Transmit-Receive Point (mTRP) scenarios, which complicates radio link failure detection and reporting.
Innovation Solution
The proposed solution involves configuring RLM resources explicitly or implicitly, using Quasi-co-location (QCL) sources associated with multiple Physical Cell Identities (PCIs), and activating multiple Transmission Configuration Indicator (TCI) states for inter-cell mTRP operations. This allows for joint RLM operations across multiple TRPs, enhancing the reliability of radio link quality assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RLM resources are configured explicitly for each TRP in inter-cell mTRP scenarios, then the accuracy of radio link quality monitoring is improved, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent segments RLM configuration by introducing separate RLM configuration parameters for each TRP (first TRP and second TRP). Each TRP can have its own reference signal resources (SSB or CSI-RS) configured independently, allowing precise monitoring of each TRP's radio link quality without requiring complex joint configuration across all TRPs.
Solution Approach 2:
The patent adds a TRP dimension to the RLM configuration structure. Instead of a single RLM configuration for the cell, the system now supports multiple RLM configurations indexed by TRP ID, enabling independent monitoring dimensions for each TRP while maintaining overall system coordination.
2Adaptability or versatility
If multiple TCI states are activated for inter-cell mTRP operations, then the versatility of beam management is improved, but the difficulty of detecting and measuring radio link quality increases
Solution Approach 1:
The patent segments the beam management and measurement process by associating each TCI state with a specific TRP through the RLM configuration. Each activated TCI state can be independently monitored against its corresponding TRP's RLM parameters, simplifying the detection and measurement process despite having multiple TCI states active simultaneously.
Solution Approach 2:
The patent introduces RLM configuration parameters as an intermediary layer between TCI states and radio link quality measurement. This intermediary structure maps TCI states to specific TRPs and provides clear measurement targets, reducing the complexity of detecting and measuring radio link quality in multi-TCI scenarios.
3Reliability
If RLM is performed on reference signals from multiple PCIs, then the reliability of radio link failure detection is improved, but the loss of time for processing and reporting increases
Solution Approach 1:
The patent segments the failure detection process by maintaining separate counters (e.g., N310, N311) and timers (e.g., T310) for each TRP. This allows independent evaluation of radio link quality per TRP, enabling faster detection of TRP-specific failures without waiting for aggregated measurements from all TRPs, thus reducing overall detection time while maintaining reliability.
Solution Approach 2:
The patent configures TRP-specific RLM parameters and measurement criteria in advance, so that when radio link quality degrades, the UE can immediately compare measurements against pre-configured thresholds and trigger failure detection procedures without requiring complex real-time decision-making, reducing processing time.
Data Source
AI summary
There is provided a method performed by a user equipment (UE). The method comprises: receiving a message for activating multiple Transmission Configuration Indicators (TCIs) configured for the UE; and performing Radio Link Monitoring (RLM) measurements, for a plurality of Transmission Reception Points (TRPs) configured for the UE, on reference signals associated with multiple Physical Cell Identifiers (PCIs), wherein the reference signals are configured as Quasi-Colocation (QCL) source of the activated TCI states. A UE for implementing this method is also provided.