CBG-Based CSI Reporting for Lower Wireless Feedback Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current techniques for reporting channel information in wireless communication systems are deficient, particularly when dealing with multiple code block groups (CBGs) in transport blocks, leading to inefficient or incomplete feedback from user equipment (UE) to base stations.
Innovation Solution
The UE is configured to report channel state information (CSI) and modulation and coding scheme (MCS) feedback at either the transport block level or CBG level, using absolute or differential metrics, and can compress feedback for multiple CBGs into bundles, reducing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports channel information for each individual CBG in a transport block, then the precision and granularity of channel feedback is improved, but the signaling overhead and complexity increase
Solution Approach 1:
The patent segments the transport block into multiple code block groups (CBGs) and enables selective reporting at different granularities. The UE can be configured to report channel information either per-CBG or per-transport block based on higher-layer parameters, allowing the system to divide the feedback into appropriate segments rather than always reporting every detail, thus balancing precision with complexity.
Solution Approach 2:
The patent introduces dynamic configurability where the reporting granularity can be changed based on channel conditions and traffic requirements. Through higher-layer signaling, the network can dynamically switch between per-CBG reporting mode and per-transport block reporting mode, making the system adaptable rather than static, thereby optimizing the trade-off between precision and complexity in different scenarios.
2Reliability
If the UE reports detailed channel information for multiple CBGs, then the communication reliability is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary channel information for retransmission optimization. Instead of reporting all possible channel metrics for every CBG, the system focuses on extracting and reporting specifically the channel quality information needed for MCS selection and retransmission decisions, reducing redundant signaling while maintaining reliability.
Solution Approach 2:
The patent changes the reporting parameters dynamically based on system needs. The UE can switch between reporting full per-CBG channel information, reporting only for failed CBGs, or reporting aggregated per-transport block information. This parameter flexibility allows the system to adjust the amount of signaling based on actual reliability requirements and channel conditions.
3Adaptability or versatility
If the system uses per-CBG channel information reporting, then the adaptability for retransmission is improved, but the processing complexity at UE increases
Solution Approach 1:
The patent segments the feedback processing into manageable units corresponding to CBGs. The UE processes and reports channel information for individual CBGs or groups of CBGs rather than handling the entire transport block as one unit, making the processing task more manageable and less complex while maintaining the ability to adapt retransmissions at the appropriate granularity.
Solution Approach 2:
The patent creates a universal reporting framework that can handle multiple reporting modes (per-CBG, per-transport block, selective CBG reporting) through a common mechanism. The same UE processing architecture supports different reporting granularities and configurations, reducing the need for separate complex processing paths and making the system more versatile without proportionally increasing complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, control signaling identifying a configuration for reporting channel metrics for transport blocks that each include a plurality of code block group. The UE may receive a first transport block that includes a first plurality of code block groups. The UE may transmit a report indicating a channel metric for one or more code block groups of the first plurality of code block groups of the first transport block in accordance with the configuration for reporting channel metrics. In some cases, the UE may report a differential channel metric, based in part on a reference metric. Additionally or alternatively, the UE may report compressed feedback for a group CBGs.