CSI Reporting Band Configuration via BWP Subband Sizing
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Solution Overview
Problem
Existing channel state information (CSI) reporting band configuration methods in wireless communication systems are inadequate for new generation networks, as they rely solely on system bandwidth, which is not flexible enough to accommodate evolving network requirements.
Innovation Solution
A method to configure the CSI reporting band by determining the channel state information subband size based on bandwidth part (BWP) bandwidth, carrier component (CC) bandwidth, or channel state information reference signal (CSI-RS) bandwidth, allowing for dynamic configuration of the quantity and size of subbands, with reporting subband configuration information indicated using information bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the quantity of subbands in CSI reporting band is configured based on system bandwidth, then the configuration is simple, but it cannot satisfy network evolution requirements and lacks flexibility
Solution Approach 1:
The patent introduces dynamic configurability by allowing the quantity of subbands to be adjusted based on different bandwidth parts (BWPs) rather than being fixed by system bandwidth. The network can dynamically select and configure appropriate subband quantities for different BWPs, enabling the system to adapt to evolving network requirements while maintaining manageable complexity through structured configuration parameters.
Solution Approach 2:
The patent changes the configuration parameter from system bandwidth to bandwidth part (BWP) bandwidth. By introducing BWP as a configurable parameter that can be independently adjusted, the system enables flexible adaptation to network evolution. The quantity of subbands is now determined by BWP bandwidth and subband size parameters, allowing network operators to optimize CSI reporting for different deployment scenarios without changing the overall system bandwidth.
2Reliability
If the CSI reporting band is configured to cover the whole system bandwidth, then complete channel information is obtained, but the complexity increases and flexibility decreases
Solution Approach 1:
The patent divides the system bandwidth into multiple bandwidth parts (BWPs), each of which can be independently configured with its own CSI reporting parameters. This segmentation allows the network to selectively enable CSI reporting for specific BWPs rather than requiring coverage of the entire system bandwidth, thus improving flexibility while maintaining reliability for the configured portions.
Solution Approach 2:
The patent enables partial CSI reporting by allowing the CSI reporting band to cover only selected BWPs rather than the entire system bandwidth. This partial action approach provides sufficient channel information for the configured BWPs while reducing configuration complexity and improving adaptability, eliminating the need for complete system bandwidth coverage.
Data Source
AI summary
An apparatus and method are provided for a quantity and size of subbands in a channel state information (CSI) reporting band for flexibility and reduced complexity of terminal addressing. The method includes: determining a channel state information subband size based on a bandwidth part (BWP), determining a quantity of channel state information subbands included in a channel state information reporting band based on (i) a carrier bandwidth (CC bandwidth), (ii) the BWP bandwidth or (iii) a channel state information reference signal (CSI-RS) bandwidth and the channel state information subband size. The method further includes determining an actual quantity of resource blocks included in a starting subband and an actual quantity of resource blocks in an ending subband in the channel state information subband.