Beam Failure Recovery in Multi-Cell Wireless Nodes
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Solution Overview
Problem
In wireless communication systems, particularly in New Radio (NR) and Massive Multi-Input Multi-Output (MIMO) scenarios, beam failures lead to a decline or interruption in communication quality, and existing mechanisms are inadequate for rapid recovery, especially in multiple serving cell environments.
Innovation Solution
A method involving the transmission of a target signal in a target radio resource group, using reference signals to detect link failures and trigger beam failure recovery, allowing for quick identification and recovery of beam communications across serving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to form narrow beams for improved communication quality, then communication quality is improved, but beam alignment becomes more difficult and beam failure risk increases
Solution Approach 1:
The system segments the beam management process into independent failure detection and recovery procedures. Each serving cell is monitored separately for beam failures using reference signal measurements, and recovery is triggered independently per cell through specific uplink signals, allowing granular control without affecting other cells
Solution Approach 2:
The system implements feedback mechanisms where the terminal device measures reference signals on each serving cell and reports link quality to the network device. When beam failure is detected through measurement degradation, the system triggers recovery procedures with explicit feedback signals to re-establish beam alignment
2Reliability
If beam failure recovery mechanisms are implemented for multiple serving cells, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The system implements a universal beam failure recovery mechanism that functions across multiple serving cells with different scheduling relationships. The same core recovery procedure applies whether the cell is self-scheduled or cross-scheduled, reducing the need for cell-specific complexity while maintaining reliability
Solution Approach 2:
The system changes key parameters to simplify complexity: it uses cell-specific uplink signal resources to identify which cell experienced failure, and employs different reference signal groups for measurement depending on the cell type. These parameter variations allow a single recovery framework to handle multiple cell scenarios
3Measurement precision
If reference signal measurements are performed on each serving cell to detect link failures, then beam failure detection accuracy is improved, but measurement and processing time increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring reference signal groups for each serving cell and establishing measurement thresholds in advance. When monitoring, the terminal simply compares current measurements against pre-set criteria and triggers recovery when thresholds are breached, eliminating complex real-time analysis delays
Solution Approach 2:
The measurement process is segmented into cell-independent parallel operations. Each serving cell's reference signal group is measured separately using dedicated resources, allowing simultaneous monitoring without inter-cell interference. This segmentation enables accurate per-cell detection while maintaining efficient overall processing time
Data Source
AI summary
The present disclosure provides a method and device in communication nodes for wireless communications . A first node receives a reference signal group respectively on each serving cell in a first cell group; and transmits a target signal in a target radio resource group. The first cell group comprises a first serving cell, a second serving cell and at least one other serving cell; a given cell is any serving cell in the first cell group, a measurement performed on the reference signal group on the given cell is used to determine whether a link failure occurs on the given cell; the link failure on a target cell is used to trigger the target signal, and at least the former of the target radio resource group and the target signal is used to indicate that the target cell is one of three possibilities of the first serving cell.