Radio Link Monitoring in Multi-TRP Scenarios
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing Radio Link Monitoring (RLM) in multiple Transmitter Receiver Point (mTRP) scenarios, particularly in scenarios involving inter-Cell changes and quality degradation detection.
Innovation Solution
The proposed solution involves a User Equipment (UE) that receives configuration information from a Centralized Unit (CU) about serving and non-serving cells. The UE performs RLM on the serving cell and, upon detecting quality degradation, requests a switch to a non-serving cell, facilitating efficient inter-cell handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs RLM only on the serving cell, then the RLM procedure is simple, but the system cannot detect quality degradation in time for inter-cell scenarios leading to RLF
Solution Approach 1:
The network pre-configures multiple candidate cells (PSCell and SCell) for RLM before quality degradation occurs. When RLF is detected on the serving cell, the UE can immediately switch to a pre-configured candidate cell, avoiding the need for complex real-time cell selection procedures and reducing switching latency.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network configures candidate cells that act as intermediate states between the serving cell and potential target cells. This intermediary layer simplifies the RLM procedure by providing a structured approach to cell switching without requiring the UE to perform complex autonomous cell selection.
2Reliability
If the UE switches RLM to a non-serving cell upon quality degradation, then RLF is avoided, but additional signaling and processing are required
Solution Approach 1:
Candidate cells are pre-configured with all necessary RLM parameters and measurement configurations before switching is needed. This preliminary setup eliminates the time required for real-time cell evaluation and configuration during the switching process, reducing overall switching time while maintaining reliability.
Solution Approach 2:
The RLM configuration is made dynamic, allowing the UE to switch between different RLM configurations (serving cell, PSCell, SCell) based on real-time link quality conditions. This dynamic approach enables rapid adaptation to changing radio conditions without fixed procedural delays.
3Adaptability or versatility
If multiple beams from different cells are supported, then mTRP operation is enhanced, but the system complexity increases beyond intra-DU scenarios
Solution Approach 1:
The patent segments the RLM functionality into separate configurations for different cell types (serving cell, PSCell, SCell), each with its own beam sets and monitoring parameters. This segmentation allows the system to support multiple beams from different cells without requiring a single complex unified configuration, thereby enhancing adaptability while managing system complexity.
Solution Approach 2:
The RLM mechanism is designed to be universal across different cell types and TRP configurations. The same basic RLM procedure can be applied whether monitoring a single serving cell or multiple cells in an mTRP scenario, reducing the need for cell-specific complex procedures and simplifying overall system configuration.
Data Source
AI summary
The present disclosure relates to techniques that enable an efficient Radio Link Monitoring (RLM) for a User Equipment (UE) in a multi Transmitter Receiver Point (mTRP) scenario. For this purpose, a serving cell of a serving Distributed Unit (DU) of a disaggregated network node and at least one non-serving (or stand-by) cell of a non-serving DU of the disaggregated network node are configured fora UE. Then, the UE is informed of beams used for the serving and non-serving cells. The UE performs the RLM over the serving cell by using the beams of the serving cell. Whenever there is an Radio Link (RL) quality degradation (which may potentially lead to an RL Failure (RLF)) detected in the serving cell, the UE may initiate switching of the RLM from the serving cell to one of the non-serving cells by transmitting a corresponding request to the serving DU.