Wireless Node Signal Prioritization via PCI Comparison
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the determination of the quasi-co-location relationship between a downlink physical layer signal and an additional cell's synchronization signal in the time domain poses challenges for efficient signal reception, especially when the signals overlap.
Innovation Solution
A method where a node receives configuration information to determine the quasi-co-location (QCL) relationship between a reference signal and a synchronization signal, allowing it to prioritize signal reception based on PCI equality, thereby ensuring accurate spatial domain filtering and subcarrier spacing alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE uses the QCL relationship of the additional cell to receive the downlink physical layer channel or signal when it overlaps with the synchronization signal of the additional cell, then the reception accuracy of the downlink physical layer channel or signal is improved, but the complexity of determining the QCL relationship increases
Solution Approach 1:
The network pre-configures QCL relationship information (TCI states) for the UE before the actual signal reception. This preliminary configuration allows the UE to quickly determine the appropriate QCL relationship without complex real-time analysis, thus improving reception accuracy while reducing determination complexity.
Solution Approach 2:
The patent introduces TCI (Transmission Configuration Indicator) states as an intermediary mechanism. The TCI states serve as pre-defined QCL relationship indicators that simplify the determination process. Instead of directly analyzing complex signal relationships, the UE uses the TCI states provided by the network to identify the correct QCL relationship, thereby reducing determination complexity while maintaining reception accuracy.
2Reliability
If the network configures the UE with at least one additional cell for transmission, then the link quality is improved, but the difficulty of determining QCL relationship when signals overlap increases
Solution Approach 1:
The patent segments the QCL relationship determination into distinct cases based on PCI values. When the PCI of the downlink physical layer channel/signal matches the PCI of the additional cell's synchronization signal, one set of QCL rules applies. When the PCIs differ, another set of QCL rules applies. This segmentation simplifies the overall determination process by breaking down the complex overlapping signal scenario into manageable cases, thereby reducing determination difficulty while maintaining link quality improvement from additional cell configuration.
3Manufacturing precision
If the UE prioritizes receiving the synchronization signal of the additional cell, then the subcarrier spacing alignment is improved, but the reception of the downlink physical layer channel or signal may be delayed
Solution Approach 1:
The network provides preliminary configuration information including QCL relationships and TCI states before the UE needs to receive the downlink physical layer channel or signal. This allows the UE to have the subcarrier spacing alignment information ready in advance, eliminating the need to delay channel/signal reception to perform synchronization. The preliminary configuration ensures both subcarrier spacing alignment and timely reception are achieved simultaneously.
Data Source
AI summary
First node receives a first configuration information block, a first reference signal and a first signal; the first configuration information block being used to determine configuration information for a first reference signal, which includes a first TCI state; the configuration information for the first reference signal being used to determine a first PCI, the first signal indicating a second PCI; the first reference signal and the first signal are overlapping in time domain; the second PCI is not equal to a PCI of a target cell, the target cell being a serving cell of the first node; whether the first reference signal and the first signal are quasi-co-located is related to whether the first PCI and the second PCI are equal. This allows the UE to flexibly choose to prioritize the reception of the reference signal of the serving cell or the synchronization signal of the additional cell as needed.