CSI Reporting Overlapping Subbands CoMP
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Solution Overview
Problem
In next-generation mobile communication systems, the efficient reporting of channel state information (CSI) across multiple base stations in a CoMP system is challenging due to varying subband sizes and overlapping configurations, leading to ambiguity in frequency granularity for CSI parameter calculation.
Innovation Solution
A method where a terminal receives configuration information from multiple base stations, determines overlapping subbands, and reports CSI accordingly, using explicit or implicit CoMP mode signaling to ensure valid CSI parameter calculation, and adjusts subband sizes to maintain frequency granularity consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple base stations use different subband sizes for CSI reporting, then each base station can optimize its own reporting configuration, but frequency granularity consistency is lost leading to ambiguity in CSI parameter calculation
Solution Approach 1:
The patent applies universality by establishing a common subband size configuration that serves multiple base stations in a CoMP system. Instead of allowing each base station to use independent subband sizes, the invention creates a universal subband configuration that works across all participating base stations, ensuring consistent frequency granularity for CSI parameter calculation while still allowing flexibility in the number and arrangement of subbands.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting subband size and number based on system conditions. The network can configure different numbers of subbands (e.g., 4 or 8 subbands) and adjust subband sizes to optimize performance while maintaining consistency across multiple base stations. This allows the system to adapt to different scenarios while preserving frequency granularity consistency.
2Measurement precision
If subband configurations are standardized across multiple base stations, then frequency granularity consistency is maintained, but configuration flexibility is reduced
Solution Approach 1:
The patent applies dynamics by making the subband configuration adaptable rather than fixed. The system can dynamically select from predefined configuration options (different numbers of subbands, different subband sizes) based on channel conditions, traffic requirements, and base station capabilities. This dynamic approach maintains frequency granularity consistency while preserving configuration flexibility through standardized yet adaptable parameters.
Solution Approach 2:
The patent uses segmentation by dividing the bandwidth into a configurable number of subbands with standardized sizes. Instead of treating the entire bandwidth as a single unit or allowing arbitrary divisions, the invention segments the spectrum into standardized subband units that can be consistently interpreted by multiple base stations, enabling both consistency and flexibility.
3Loss of information
If CSI reporting is performed for all subbands in overlapping BWPs, then complete channel state information is obtained, but reporting overhead increases
Solution Approach 1:
The patent applies the extraction principle by selectively reporting CSI for only the necessary subbands rather than all subbands. The terminal identifies and extracts the specific subbands that are relevant for CoMP operation (overlapping subbands between BWPs) and reports CSI only for those extracted subbands, reducing reporting overhead while maintaining information completeness for the critical frequency regions.
Solution Approach 2:
The patent uses partial action by reporting CSI for a subset of subbands rather than all subbands. Instead of performing exhaustive CSI reporting across the entire bandwidth, the system performs partial reporting focused on the overlapping subbands that are most critical for CoMP performance, achieving sufficient information completeness with reduced overhead.
Data Source
AI summary
A method of reporting, by a terminal, channel state information (CSI) includes: receiving first configuration information related to a channel state information (CSI) report of a first bandwidth part (BWP) from a first base station and second configuration information related to a CSI report of a second BWP from a second base station, in which the first BWP is composed of a plurality of first subbands including at least one first subband for the CSI report, and the second BWP is composed of a plurality of second subbands including at least one second subband for the CSI report; based on that the at least one first subband and the at least one second subband partially or entirely overlap, obtaining a first CSI for overlapping at least one subband; and reporting the first CSI to the first base station and the second base station.