Terminal CSI Sub-report Allocation for Wideband Reliability
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Solution Overview
Problem
In future radio communication systems, the reliability of channel state information (CSI) deteriorates when the wideband for CSI reporting is widened, leading to increased uplink overhead if the subband size is made sufficiently smaller than the coherence bandwidth.
Innovation Solution
A terminal that determines multiple pieces of CSI corresponding to at least one group and an ID for each CSI, and transmits each CSI based on the corresponding ID, to prevent reduction in CSI reliability while reducing uplink overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the wideband for CSI reporting is widened to support wider frequency bands, then the coverage of CSI reporting is improved, but the reliability of CSI deteriorates when subband size becomes larger than coherence bandwidth
Solution Approach 1:
The patent segments the wideband into multiple subbands for CSI reporting. Each subband is smaller than the coherence bandwidth, ensuring that CSI measurements within each subband remain reliable. The terminal determines multiple pieces of CSI, each corresponding to a specific subband, and transmits them separately, thus maintaining CSI reliability while supporting wider frequency bands.
2Reliability
If the subband size is made sufficiently smaller than the coherence bandwidth to maintain CSI reliability, then the reliability of CSI is preserved, but the uplink overhead increases
Solution Approach 1:
The patent introduces dynamic subband sizing where the subband size is determined based on the coherence bandwidth of the channel. The terminal and base station can adaptively adjust the subband size according to channel conditions, ensuring that each subband remains smaller than the coherence bandwidth for reliable CSI measurement while optimizing the number of subbands to control uplink overhead. This dynamic adjustment allows the system to balance reliability and overhead requirements.
Data Source
AI summary
A terminal is disclosed and includes a processor that generates at least one channel state information (CSI) report including a plurality of CSI sub-reports, and a transmitter that transmits the at least one CSI report. The processor determines allocations of the plurality of the CSI sub-reports in the CSI report according to IDs of the plurality of the CSI sub-reports. In other aspects, a radio communication method and a system are also disclosed.