PUCCH/PUSCH Beam Reference Using Non-Serving Cell Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in providing seamless mobility and improved service through efficient beam switching across serving and non-serving cells, especially in scenarios where cells share the same PCI.
Innovation Solution
A base station indicates a TCI state or spatial relation for a UE based on a quasi co-location (QCL) relationship with reference signals from non-serving cells, such as SSB, CSI-RS, or PRS, allowing the UE to determine pathloss and adjust transmissions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If beam switching is limited to serving cell only, then device complexity is reduced, but mobility and service quality deteriorate
Solution Approach 1:
The patent segments beam management into serving cell beam management and non-serving cell beam management. The UE maintains separate beam information for serving cells and non-serving cells, allowing independent optimization of each. This segmentation enables extended mobility capabilities while keeping the complexity manageable through structured organization of beam data.
Solution Approach 2:
The patent adds a new dimension to beam management by incorporating non-serving cell beams alongside serving cell beams. Instead of only managing beams within a single serving cell, the system now manages beams across multiple cells including non-serving cells, creating a multi-dimensional beam space that enhances mobility while distributing complexity across different cell dimensions.
2Reliability
If pathloss is determined using serving cell signal only, then measurement precision is simplified, but communication reliability deteriorates
Solution Approach 1:
The patent merges pathloss determination from both serving cell signals and non-serving cell signals. The UE calculates pathloss using reference signals from multiple sources including serving and non-serving cells, combining these measurements to determine uplink transmission parameters. This merging improves communication reliability by utilizing diverse signal sources while maintaining manageable complexity through standardized pathloss calculation procedures.
Data Source
AI summary
The apparatus is configured to provide beam indication, TCI state or spatial relation, based on a reference signal of a non-serving cell and receiving the beam indication, and possibly a pathloss RS configuration, based on the RS of the non-serving cell.