CSI Report Filtering for Multi-BWP Cellular Networks
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Solution Overview
Problem
Current radio communication systems for fifth-generation cellular networks face challenges in efficiently managing channel state information (CSI) reports across multiple serving cells, particularly in scenarios involving multiple bandwidth parts (BWP), which affects communication efficiency.
Innovation Solution
The system includes a terminal apparatus and a base station apparatus with configurations to transmit and receive CSI reports, where the CSI reports are filtered to only include information from the activated BWP, optimizing CSI measurement and reporting by associating each serving cell with specific CSI report configurations, reference signal configurations, and a BWP index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If CSI reports are transmitted for all BWPs in multiple serving cells, then complete channel state information is provided, but transmission overhead and processing complexity increase
Solution Approach 1:
The patent extracts and transmits only the necessary CSI information from activated BWPs, removing redundant CSI data from deactivated BWPs. This selective extraction reduces transmission overhead and processing complexity while maintaining the essential channel state information needed for effective communication.
Solution Approach 2:
The patent segments the CSI reporting process by BWP activation status, separating activated BWPs from deactivated BWPs. This segmentation allows the system to process and transmit CSI reports differently based on activation state, reducing overall complexity while preserving necessary information from active segments.
2Loss of information
If CSI reports for all BWPs are transmitted, then comprehensive channel state information is available, but uplink transmission resources are wasted
Solution Approach 1:
The patent extracts only the essential CSI information from activated BWPs for transmission, removing redundant information from deactivated BWPs. This extraction approach ensures that uplink transmission resources are utilized efficiently by sending only the necessary channel state information.
3Measurement precision
If multiple CSI report configurations are maintained for all BWPs, then detailed channel state monitoring is possible, but memory and processing requirements increase
Solution Approach 1:
The patent segments CSI report configurations by BWP activation status, maintaining detailed configurations only for activated BWPs. This segmentation reduces memory requirements by eliminating the need to store and process CSI configurations for deactivated BWPs, while preserving measurement precision for active BWPs.
Solution Approach 2:
The patent applies partial action by maintaining full CSI report configurations only for activated BWPs rather than for all BWPs. This partial maintenance of configurations reduces memory and processing requirements while sufficient precision is maintained for the active portions of the system.
Data Source
AI summary
The present invention includes: a receiver configured to receive a physical downlink control channel for conveying downlink control information including a first information field; and a transmitter configured to report channel state information (CSI), wherein the first information field indicates first information, the first information indicates one of multiple states, each of the multiple states is configured for a serving cell, and is associated with: one or more CSI report configurations; one or more reference signal configurations for CSI measurement; and a bandwidth part (BWP) index for the serving cell, and in a case that CSI reports of BWPs in a plurality of the serving cells are triggered, a CSI report of the CSI reports for only a BWP indicated by the BWP index that is activated is transmitted.