Channel State Reporting for Bandwidth Part Adaptation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information, particularly during bandwidth part (BWP) adaptation or switching, which affects communication reliability and latency in next-generation wireless communication systems.
Innovation Solution
A method and apparatus for a user equipment (UE) to receive configurations for channel state reporting across multiple BWPs, including active and inactive BWPs, where CSI is reported for overlapping and non-overlapping subbands, with adjustable subband sizes and reporting periodicities, enabling efficient CSI measurement and feedback even during dynamic BWP adaptation or switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI is reported for multiple BWPs including inactive BWP, then channel state measurement accuracy is improved, but reporting overhead and complexity increase
Solution Approach 1:
The patent segments CSI reporting into different types (Type I and Type II) with different levels of detail and overhead. Type I CSI provides basic channel state information with lower overhead, while Type II CSI provides more precise information with higher overhead. This segmentation allows the system to balance measurement accuracy with reporting complexity based on specific needs.
Solution Approach 2:
The patent changes key parameters such as subband size, reporting periodicity, and CSI type to optimize the balance between measurement accuracy and overhead. By adjusting subband size (larger for lower overhead, smaller for higher accuracy) and reporting periodicity (longer for lower overhead, shorter for higher accuracy), the system can adapt to different channel conditions and service requirements.
2Adaptability or versatility
If BWP switching is performed dynamically, then system adaptability is improved, but CSI reporting latency increases
Solution Approach 1:
The patent performs preliminary CSI measurement and reporting for inactive BWPs before actual BWP switching occurs. By measuring and reporting CSI for potential target BWPs in advance, the system reduces the latency that would otherwise occur after switching, as the gNB already has current channel state information for the new BWP.
Solution Approach 2:
The patent maintains continuous CSI measurement and reporting across BWP switches by configuring multiple CSI processes that operate simultaneously for different BWPs. This continuity ensures that channel state information is always available without interruption or delay during BWP transitions.
3Measurement precision
If subband size is reduced for more detailed CSI, then measurement precision is improved, but reporting overhead increases
Solution Approach 1:
The patent applies partial action by reporting CSI for only certain subbands rather than all subbands, especially for inactive BWPs. The system can select representative subbands or report only when channel conditions warrant detailed reporting, thereby reducing overall overhead while maintaining sufficient precision for effective BWP switching decisions.
Data Source
AI summary
A method for reporting a channel state in a wireless communication system according to an embodiment of the present disclosure, the method being performed by a terminal, and comprising the steps of: the terminal receiving a channel state reporting-related configuration with respect to a plurality of bandwidth parts (BWPs) that are performing BWP adaptation or switching; and reporting channel state information with respect to the plurality of BWPs according to the received configuration, wherein the channel state information with respect to the plurality of BWPs includes channel state information with respect to BWPs that are not activated, the plurality of BWPs include a first BWP and a second BWP of which at least a part is overlapped with the first BWP and which has a smaller size than the first BWP, the size of a sub-band of the first BWP corresponds to a multiple of the size of a sub-band of the second BWP, and the sub-band of the first BWP can completely include the sub-band of the second BWP.