CSI Report Segmentation for Uplink Payload Optimization
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently determining the resource allocation for channel state information (CSI) reporting, leading to insufficient payload capacity in physical uplink channels for carrying CSI reports, which affects channel condition feedback and overall network performance.
Innovation Solution
A method where a user equipment (UE) determines a reference size for the payload in a physical uplink channel to carry CSI reports, prioritizing the transmission of CSI for wideband and subbands, ensuring that all first parts of CSI reports are carried, along with a selection of subband CSI reports, and a portion of the Mth CSI report, to optimize the payload size and transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the payload size is increased to carry more CSI reports, then the channel condition feedback is improved, but the transmission time and resource consumption increase
Solution Approach 1:
The CSI reports are segmented into two parts: first parts containing wideband CSI and second parts containing subband CSI. This segmentation allows the UE to prioritize and transmit the most critical wideband CSI information first, then selectively include subband CSI based on available payload capacity, thereby balancing feedback completeness with transmission efficiency
Solution Approach 2:
The UE performs partial action by transmitting only the necessary portion of CSI reports based on the determined payload size. When the payload capacity is limited, the UE transmits all first parts and selectively includes second parts of CSI reports, avoiding the need to transmit complete CSI for all reports and thus reducing transmission time while maintaining essential feedback
2Loss of information
If all CSI reports are transmitted completely, then the information completeness is improved, but the payload capacity is insufficient
Solution Approach 1:
By dividing CSI reports into first parts (wideband CSI) and second parts (subband CSI), the system enables selective transmission. The UE must transmit all first parts as they contain essential wideband channel state information, while second parts are included only to the extent that payload capacity allows, thus maintaining information completeness for critical parameters while adapting to payload limitations
Solution Approach 2:
Different parts of CSI reports have different transmission priorities and quality requirements. The first parts with wideband CSI are transmitted with full quality and priority, while second parts with subband CSI are transmitted with variable quality depending on available payload capacity, optimizing the balance between information completeness and payload utilization
3Productivity
If the payload size is optimized for fewer CSI reports, then the transmission efficiency is improved, but the channel state feedback accuracy deteriorates
Solution Approach 1:
The segmentation of CSI reports into prioritized parts enables the system to maintain transmission efficiency by transmitting only essential wideband CSI (first parts) when payload capacity is constrained, while still providing subband CSI (second parts) when capacity allows, thus balancing efficiency with feedback accuracy
Solution Approach 2:
The system dynamically adjusts the payload size parameter based on available uplink resources and determines the number of CSI reports to transmit. This parameter adaptation allows the system to optimize transmission efficiency by adjusting the quantity and type of CSI reports transmitted according to current network conditions, maintaining adequate feedback accuracy for channel state estimation
Data Source
AI summary
A method of wireless communication of a UE is provided. The UE determines a reference size of a payload available in a physical uplink channel for carrying R channel state information (CSI) reports, R being an integer greater than 0, each of the R CSI reports including a first part containing CSI of a wideband and a second part containing CSI of one or more subbands of the wideband. The UE carries all first parts of the R CSI reports in the payload. The UE further carries second parts of (M−1) CSI reports of the R CSI reports in the payload. The UE carries a portion of a second part of an Mth CSI report of the R CSI reports in the payload.