Adaptive Subcarrier Spacing for Wireless Control Channel Reception
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Solution Overview
Problem
Current LTE standards face challenges in efficiently receiving and transmitting downlink control channels, particularly in carrier aggregation scenarios with multiple component carriers, where increased bandwidth requirements and carrier frequency errors can lead to errors in HARQ-ACK and CSI transmission, affecting communication reliability.
Innovation Solution
A method for receiving downlink signals in a wireless communication system where subcarrier spacing is adaptively adjusted for each frequency band, allowing for flexible control channel scheduling and detection across different frequency bands, enabling efficient transmission and reception of control channels, even in high-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation with multiple component carriers is used to support wider bandwidth, then data transfer rate is improved, but carrier frequency errors increase leading to communication reliability degradation
Solution Approach 1:
The patent segments the control channel reception process by frequency band, applying different subcarrier spacing configurations to different frequency bands. This allows independent optimization for each band, reducing the impact of carrier frequency errors in high-frequency bands while maintaining the benefits of carrier aggregation for increased data transfer rate.
Solution Approach 2:
The patent applies local quality by configuring adaptive subcarrier spacing specifically for high-frequency bands where carrier frequency errors are more prominent. This targeted approach improves communication reliability in affected bands without changing the overall carrier aggregation structure that enables high data transfer rates.
2Reliability
If adaptive subcarrier spacing is applied to each frequency band, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic subcarrier spacing adaptation where the subcarrier spacing is flexibly configured based on frequency band characteristics. This dynamic approach allows the system to adjust to different conditions while maintaining a unified framework, balancing reliability improvement with manageable system complexity.
Solution Approach 2:
The patent changes the subcarrier spacing parameter adaptively for different frequency bands. By modifying this key parameter based on band-specific requirements, the system achieves improved communication reliability without fundamentally redesigning the overall system architecture, thus limiting the increase in complexity.
3Productivity
If control channels are transmitted on each frequency band with different transmission units, then resource utilization is improved, but detection complexity increases
Solution Approach 1:
The patent segments control channel detection by frequency band, with each band having its own transmission unit configuration. This segmentation allows optimized resource utilization per band while organizing the detection process in a structured manner that manages complexity through systematic handling of each segment.
Data Source
AI summary
An embodiment of the present invention relates to a method for receiving a downlink signal for a terminal which is set to operate in multiple frequency bands in a wireless communication system. The method is performed by a terminal, and may comprise the steps of: receiving information on a transmission unit of a control channel transmitted in each of the multiple frequency bands, wherein subcarrier spacing for each of the multiple frequency bands is adaptively adjusted; and detecting the control channel in each of the multiple frequency bands on the basis of the information.