CSI Reporting for Antenna Port Subsets Using Existing Codebooks
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively reporting channel state information (CSI) based on sub-configurations, particularly in managing antenna ports and code division multiplexing groups, which affects the allocation and feedback of CSI.
Innovation Solution
A method and device for reporting CSI in wireless communication systems that involve receiving configuration information, checking antenna port subsets, generating CSI based on CSI-RS measurements, and transmitting CSI reports with precoding matrix indicators determined by mapping antenna port indexes in ascending order, allowing for efficient CSI feedback using existing codebooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antenna ports are managed using traditional methods in CSI reporting, then the reporting process is simple, but the reporting efficiency and accuracy for sub-configurations deteriorates
Solution Approach 1:
The patent divides the antenna port management into subsets (first antenna port subset and second antenna port subset) corresponding to different sub-configurations. This segmentation allows independent management and reporting of CSI for different antenna port groups, improving reporting efficiency without overwhelming complexity
Solution Approach 2:
The patent introduces a new dimension of organization by mapping antenna port indexes to consecutive values in ascending order within each subset. This dimensional reorganization enables efficient identification and reporting of CSI for specific antenna port subsets, resolving the contradiction between efficiency and complexity
2Measurement precision
If antenna port indexes are mapped in ascending order within subsets, then CSI feedback accuracy improves, but the complexity of index mapping increases
Solution Approach 1:
The patent performs preliminary mapping of antenna port indexes to consecutive values in ascending order before CSI reporting. This pre-organization of indexes simplifies the subsequent CSI feedback process and improves accuracy by ensuring systematic identification of antenna ports, while the mapping rule itself remains straightforward
Solution Approach 2:
The patent changes the parameter organization by reindexing antenna ports within subsets to consecutive values. This parameter transformation enables precise identification of antenna ports for CSI reporting without requiring complex mapping relationships, as the consecutive indexing provides a simple yet effective mapping mechanism
3Device complexity
If existing codebooks are utilized for CSI reporting, then device complexity is reduced, but the adaptability to sub-configuration variations deteriorates
Solution Approach 1:
The patent segments the antenna ports into different subsets that can be independently configured and reported. By maintaining existing codebooks for each subset, the system achieves adaptability to sub-configurations without requiring entirely new codebook structures, thus preserving simplicity while gaining versatility
Solution Approach 2:
The patent makes existing codebooks multi-functional by applying them to different antenna port subsets. The same codebook structures can serve multiple sub-configurations, providing adaptability to variations while avoiding the complexity of creating and managing separate codebooks for each configuration
Data Source
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AI summary
The objective of the present disclosure is to report channel state information (CSI) on the basis of sub-configurations in a wireless communication system, and this method, performed by a terminal, comprises the steps of: receiving configuration information on channel state information (CSI) reporting including at least one sub-configuration; checking information related to an antenna port subset associated with the at least one sub-configuration; generating CSI for the at least one sub-configuration on the basis of measurement results based on at least one CSI-RS associated with the CSI reporting; and transmitting a CSI report comprising the CSI to a base station.