Beam Failure Detection Reference Signal Configuration in 5G NR
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Solution Overview
Problem
In 5G and NR wireless communication systems, there is an inefficiency in configuring reference signals for beam failure detection, leading to increased signaling overhead and latency when the indicated TCI state refers to aperiodic or semi-persistent CSI-RS, as existing methods require explicit RRC signaling, which is not optimal.
Innovation Solution
The proposed solution involves determining if at least one periodic RS is included in the set of failure detection resources when the TCI state for PDCCH refers to an aperiodic or semi-persistent CSI-RS, and if so, omitting the configured TCI state from the failure detection resources, or using the QCL source RS if it is periodic, to switch between explicit and implicit configuration modes for beam failure detection and radio link monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit RRC signaling is used to configure failure detection resources when TCI state refers to aperiodic or semi-persistent CSI-RS, then configuration reliability is improved, but signaling overhead and latency increase
Solution Approach 1:
The UE autonomously determines the failure detection resource set by itself based on the TCI state configuration and QCL assumptions, without requiring explicit RRC signaling from the network. This self-service mechanism eliminates the need for additional signaling while maintaining configuration reliability, as the UE can independently derive the appropriate reference signals for failure detection based on existing configurations.
Solution Approach 2:
The existing TCI state configuration and QCL assumption mechanisms are extended to serve dual purposes: both for indicating the PDCCH transmission beam and for implicitly defining the failure detection resource set. This multi-functionality allows the same signaling structures to provide multiple functions, eliminating the need for separate explicit failure detection resource configuration while maintaining reliability.
2Manufacturing precision
If explicit RRC signaling is used to configure failure detection resources, then configuration precision is improved, but device complexity and processing overhead increase
Solution Approach 1:
The UE performs autonomous determination of failure detection resources by evaluating its own configuration state, including TCI states and QCL assumptions. This self-service approach shifts the processing burden from network-UE signaling exchange to local UE decision-making, reducing overall system complexity while maintaining precise configuration through the UE's own knowledge of the configured parameters.
Solution Approach 2:
The explicit failure detection resource configuration step is extracted and removed from the signaling流程. Instead of adding separate configuration messages, the solution extracts the necessary information from existing TCI state and QCL configurations that are already present in the system, thereby reducing device complexity without sacrificing configuration precision.
3Loss of energy
If implicit configuration using QCL source RS is used, then signaling overhead is reduced, but reliability may be compromised when periodic RS are not available
Solution Approach 1:
The solution dynamically changes the configuration parameter selection based on the availability of periodic reference signals. When periodic RS are available, the system uses implicit configuration with QCL source RS to minimize signaling overhead. When periodic RS are not available, the system transitions to using aperiodic or semi-persistent RS with explicit configuration indicators, thereby adapting the reliability mechanism to the available resources while maintaining energy efficiency.
Data Source
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AI summary
Systems, methods, apparatuses, and computer program products for the configuration of beam failure detection reference signals are provided.