CSI Reporting Configuration for Flexible Duplex Resource Overlap
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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 in flexible duplex technology, leading to inefficient channel state information reporting.
Innovation Solution
The method involves configuring a terminal device to report CSI on non-overlapping subbands, determining CSI values as preset, and reducing blind detection by the network device, thereby optimizing resource utilization and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flexible duplex technology is used to allow simultaneous uplink and downlink transmission, then resource utilization is improved, but CSI detection complexity increases due to overlapping CSI-RS resources with uplink resources
Solution Approach 1:
The patent segments the frequency spectrum into multiple subbands and configures different CSI-RS resources for different subbands. By dividing the bandwidth into smaller units, 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 with particular properties for specific subbands where overlaps occur. The network device can locally adjust CSI reporting configurations for affected subbands while maintaining normal CSI reporting for non-overlapping subbands, thereby resolving the detection complexity issue locally without sacrificing overall resource utilization
2Measurement precision
If blind detection is performed to determine CSI bit quantity, then CSI reporting accuracy is improved, but detection complexity and time consumption increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring CSI-RS resource parameters and CSI reporting configurations through signaling before actual CSI measurement and reporting. The network device provides advance information about CSI bit quantities and resource allocations, eliminating the need for blind detection during real-time operation, thus reducing detection complexity while maintaining reporting accuracy
3Area of stationary object
If CSI is reported on overlapping subbands, then channel measurement coverage is improved, but overheads and resource waste increase
Solution Approach 1:
The patent extracts and identifies the specific subbands where CSI-RS resources overlap with uplink resources. For these identified overlapping subbands, the system either excludes them from CSI reporting or applies special handling configurations. This selective extraction approach maintains channel measurement coverage on non-overlapping subbands while eliminating unnecessary overheads from reporting on overlapping subbands where measurement is impossible
Data Source
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AI summary
A communication method and apparatus are provided. The method includes: 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. The first resource includes a resource used for uplink transmission, and a resource corresponding to a guard band between the resource used for uplink transmission and a resource used for downlink transmission. Then, the terminal device may determine the first CSI, where a value of the first CSI corresponding to the one or more resources is a preset value. In this way, the network device can determine a bit quantity of the first CSI based on the first subband, so that the network device does not perform blind detection. This decreases complexity of detecting CSI by the network device.