Beam Failure Reporting for Multi-Cell NR Terminals
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Solution Overview
Problem
Current beam failure recovery (BFR) procedures in communication systems, particularly in New Radio (NR) networks, are inadequate for secondary cells (SCells) as they rely on resource-intensive reporting mechanisms that may not efficiently handle beam failures across multiple serving cells, leading to insufficient information transmission and increased overhead.
Innovation Solution
A method where a terminal device performs beam failure detection on multiple serving cells and transmits partial information about beam failures to a network device using allocated resources, optimizing the reporting process by reducing the amount of data transmitted and enabling efficient beam failure recovery for both primary and secondary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete beam failure detection information is reported for all serving cells, then measurement precision is improved, but device complexity and transmission overhead increase
Solution Approach 1:
The patent segments the beam failure detection reporting by dividing serving cells into different categories (e.g., PCell vs. SCells) and applying different reporting rules to each segment. This allows selective reporting where only certain cells require detailed beam failure detection information while others use simplified reporting, thus reducing overall system complexity while maintaining necessary detection precision for critical cells.
Solution Approach 2:
The patent implements partial reporting where the terminal device reports beam failure detection information for only a subset of serving cells rather than all cells. Specifically, detailed reporting is performed for primary cells while secondary cells use simplified or conditional reporting, achieving adequate measurement precision for critical functions while reducing the burden of complete reporting across all cells.
2Reliability
If beam failure detection is performed on all serving cells, then reliability is improved, but use of energy and processing resources increases
Solution Approach 1:
The patent segments serving cells into different groups with different monitoring requirements. Primary cells (PCell) undergo comprehensive beam failure detection to ensure communication reliability, while secondary cells (SCells) use reduced monitoring or on-demand detection. This segmentation maintains reliability for critical communication functions while reducing energy consumption from unnecessary monitoring of non-critical cells.
Solution Approach 2:
The patent applies different quality levels of beam failure detection to different serving cells based on their importance. Critical cells receive high-quality comprehensive detection while less critical cells receive lower-quality simplified detection. This local differentiation ensures reliability where needed while conserving terminal device energy resources in other areas.
3Loss of information
If detailed beam failure information is transmitted for all cells, then information completeness is improved, but transmission overhead increases
Solution Approach 1:
The patent segments beam failure information reporting by cell type, transmitting detailed information for primary cells while using condensed or differential reporting for secondary cells. This segmentation ensures that critical beam failure information is completely transmitted for important cells while reducing overall data volume through selective reporting of less critical cell information.
Solution Approach 2:
The patent extracts and prioritizes transmission of beam failure information for critical serving cells (PCell) while omitting or simplifying information for non-critical cells (SCells). This extraction approach ensures that the most important beam failure information is transmitted completely while reducing total transmission overhead by leaving out redundant or less critical data.
Data Source
AI summary
Example embodiments of the present disclosure relate to reporting beam failure. A terminal device performs beam failure detection on a first number of serving cells configured for the terminal device. The terminal device determines information to at least indicate respective results of the beam failure detection on a second number of serving cells among the first number of serving cells, where the second number is smaller than the first number. The determined information is transmitted by the terminal device to a network device serving the terminal device using a resource allocated for the terminal device. Based on the information, the network device determines an overall result of the beam failure detection performed on the first number of serving cells.