Subband CSI Reporting for Overlapping CSI-RS Resource Detection
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Solution Overview
Problem
The complexity of CSI detection is increased in mobile communication systems due to overlapping CSI-RS resources with uplink resources, leading to inefficient network device operations.
Innovation Solution
Configuring terminal devices to report CSI on non-overlapping subbands and using preset values for CSI detection, reducing the need for blind detection by the network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible duplex technology is used to allow simultaneous uplink and downlink transmission, then resource configuration flexibility is improved, but CSI detection complexity increases due to overlapping CSI-RS resources with uplink resources
Solution Approach 1:
The patent segments the frequency domain into multiple subbands and configures different CSI-RS resources for different subbands. By dividing the overall frequency range into smaller subbands, the system can manage overlapping resources more effectively, allowing the network device to determine CSI bit quantities per subband rather than performing blind detection across the entire bandwidth, thus reducing CSI detection complexity while maintaining flexible duplex operation
Solution Approach 2:
The patent applies local quality by configuring specific CSI-RS resources for specific subbands rather than uniform configuration across all frequencies. Each subband can have its own CSI-RS resource configuration, allowing the system to optimize for local conditions and reduce overall detection complexity by limiting the scope of CSI reporting to specific subbands where measurements are valid
2Measurement precision
If blind detection is performed by the network device to determine CSI bit quantity, then CSI detection accuracy is improved, but energy consumption and detection complexity increase
Solution Approach 1:
The patent implements preliminary action by having the terminal device determine the CSI bit quantity based on predefined rules regarding subband overlaps before reporting CSI. The terminal device calculates which CSI-RS resources overlap with uplink resources in each subband and determines the appropriate bit quantity accordingly. This eliminates the need for the network device to perform energy-consuming blind detection, as the bit quantity is already determined and can be inferred from the subband configuration
Solution Approach 2:
The patent establishes a feedback mechanism where the terminal device reports CSI with a predetermined bit quantity based on subband overlap analysis. The network device can infer the bit quantity from the configuration information, creating a feedback loop that eliminates blind detection. The terminal's preliminary determination of bit quantity based on overlap conditions provides the network device with the necessary information without requiring additional detection operations
3Loss of information
If CSI is reported for all subbands including overlapping regions, then measurement completeness is improved, but transmission overhead increases
Solution Approach 1:
The patent extracts and excludes overlapping subbands from CSI reporting. When a subband is identified as overlapping with uplink resources, the terminal device determines that CSI for that subband should be set to a preset value (e.g., all zeros) and excludes it from meaningful reporting. This extraction of problematic subbands from the reporting process reduces transmission overhead while maintaining measurement completeness for non-overlapping subbands where valid measurements can be performed
Data Source
AI summary
A communication method is provided. Wherein a terminal device receives first configuration information and second configuration information from a network device. The first configuration information is used to configure the terminal device to report first CSI of a first subband. The second configuration information is used to configure a first resource set. Any resource in the first resource set is a resource configured for the terminal device for channel measurement. An overlapping part between one or more resources in the first resource set and a first resource includes the first subband.