CSI Report Segmentation for UCI Payload Reduction
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in reducing uplink control information (UCI) payload, which can lead to inefficiencies in channel encoding and increased data transmission requirements.
Innovation Solution
A method where a user equipment (UE) determines and transmits encoded bits by selectively omitting lower-priority information bits from CSI reports, segmenting data to meet encoder input size constraints, and applying omission rules to ensure the data meets predetermined code rate and segment size thresholds, thereby reducing the UCI payload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE transmits all K1 information bits including complete CSI reports, then the channel state information completeness is improved, but the uplink control information payload size increases
Solution Approach 1:
The patent extracts and transmits only the most critical portions of CSI reports (Part 1 and selected Part 2 information) while omitting less critical data. This selective extraction reduces the UCI payload size while preserving essential channel state information needed for downlink transmission optimization.
Solution Approach 2:
The patent applies partial action by transmitting a subset of available CSI information rather than complete reports. The UE determines K2 < K1 information bits to transmit, providing sufficient channel state information for effective downlink communication while avoiding the overhead of transmitting all available CSI data.
2Productivity
If the UE segments CSI reports to meet encoder input size constraints, then the channel encoding efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent segments the K1 information bits into multiple groups and selects K2 bits from these segments for transmission. The channel encoder then processes these segmented bits in manageable chunks, improving encoding efficiency while the segmentation structure itself provides a systematic approach that manages complexity through organized data division.
3Quantity of substance
If the UE applies omission rules to reduce UCI payload, then the uplink transmission overhead is reduced, but the information completeness deteriorates
Solution Approach 1:
The patent applies different quality levels to different portions of CSI information. Part 1 of CSI reports (containing essential wideband CSI) is transmitted with high priority, while Part 2 (containing subband-specific details) is selectively transmitted based on available payload capacity. This local quality differentiation ensures critical information is always transmitted while optional information is added when resources permit.
Data Source
AI summary
A method of wireless communication of a UE is provided. The UE determines K1 information bits carrying one or more CSI reports, the one or more reports including a first CSI report, K1 being an integer greater than 0. The UE selects K2 information bits from the K1 information bits, the K2 information bits excluding a part of information bits of the first CSI report, K2 being an integer greater than 0 and smaller than K1. The UE determines that the K2 information bits are in a first predetermined relationship with a threshold. The UE transmits E2 encoded bits derived from the K2 information bits in a physical up-link channel to a base station, E2 being an integer greater than 0.