QCL Parameter Alignment for PDSCH Reception and Uplink Transmission
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Solution Overview
Problem
In future radio communication systems like NR, determining Quasi-Co-Location (QCL) parameters for downlink and uplink signals can lead to system performance deterioration due to complications in UE operation and reduced throughput, as QCL parameters used for receiving and transmitting signals may differ.
Innovation Solution
A terminal that adjusts QCL parameters based on specific conditions, using a first QCL parameter for receiving a physical downlink shared channel (PDSCH) and a second QCL parameter for transmitting an uplink signal, ensuring they are equal when certain conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different QCL parameters are used for receiving downlink signals and transmitting uplink signals, then the terminal can optimize signal reception and transmission separately, but system performance deteriorates due to complicated UE operation and reduced throughput
Solution Approach 1:
The patent dynamically changes QCL parameters based on operational conditions. When the terminal determines that a second QCL parameter differs from a first QCL parameter, it selectively applies the second QCL parameter to uplink signals under specific conditions (such as when spatial relation information is not configured), thereby optimizing parameter selection to balance adaptability and throughput performance
2Adaptability or versatility
If different QCL parameters are used for receiving downlink signals and transmitting uplink signals, then specialized optimization is possible, but UE operation becomes complicated
Solution Approach 1:
The patent implements conditional parameter selection where the terminal determines whether to apply different QCL parameters based on specific conditions (such as configuration of spatial relation information). This approach maintains operational simplicity by using default behavior (first QCL parameter) while allowing specialized optimization (second QCL parameter) only when conditions are met, thus balancing adaptability with ease of operation
3Adaptability or versatility
If QCL parameters are determined separately for downlink and uplink, then signal-specific optimization is achieved, but system performance deteriorates
Solution Approach 1:
The patent employs conditional parameter application where the terminal selectively uses different QCL parameters based on determined conditions. When spatial relation information is not configured for uplink signals, the terminal applies the second QCL parameter; otherwise, it uses the first QCL parameter. This conditional approach ensures reliable system performance by maintaining consistency where appropriate while allowing optimization where beneficial
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives at least one of first information relating to a physical downlink shared channel (PDSCH) and second information relating to an uplink signal; and a control section that uses, when the first information satisfies a first condition, a first Quasi-Co-Location (QCL) parameter for receiving the PDSCH, instead of a QCL parameter indicated for the PDSCH, and uses, when the second information satisfies a second condition, a second QCL parameter for transmitting the uplink signal, instead of a QCL parameter indicated for the uplink signal, in which the first QCL parameter and the second QCL parameter are equal. According to an aspect of the present disclosure, QCL parameters can be appropriately determined.