CSI Feedback Prioritization With Unequal Error Protection
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Solution Overview
Problem
Current communication systems face challenges in efficiently reporting channel state information (CSI) from user equipment (UE) to base stations, particularly in providing unequal error protection for messages, which is crucial for reliable communication, especially in unstable channel conditions.
Innovation Solution
The UE determines priority levels for messages containing CSI and employs encoding techniques such as Polar codes, Reed-Muller codes, and superposition coding to offer varying error protection levels, ensuring that critical messages are transmitted with higher reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If equal error protection is applied to all CSI messages, then implementation simplicity is maintained, but reliability of critical messages cannot be prioritized
Solution Approach 1:
The patent applies different error protection levels to different messages based on their priority. High-priority CSI messages receive stronger error protection (lower code rate, more redundancy) while low-priority messages receive weaker protection. This local differentiation of protection quality resolves the contradiction by making the system adaptable to message importance without requiring complete redesign of the entire error protection mechanism.
Solution Approach 2:
The patent changes the code rate parameter dynamically based on message priority. High-priority messages are encoded with lower code rates (more protection), while low-priority messages use higher code rates (less protection). This parameter adjustment allows the system to optimize reliability for critical messages while maintaining overall system efficiency, resolving the contradiction between reliability and complexity.
2Reliability
If higher error protection is provided for all messages, then reliability is improved, but transmission efficiency decreases due to increased redundancy
Solution Approach 1:
Instead of applying uniform high error protection to all messages, the patent applies high protection only to high-priority CSI messages that require reliable delivery. Low-priority messages receive standard or reduced protection. This localized application of error protection maintains transmission efficiency while ensuring reliability for critical information.
Solution Approach 2:
The patent applies error protection selectively and partially - only to the extent necessary for each message's priority level. High-priority messages receive excessive protection (lower code rates), while low-priority messages receive minimal necessary protection. This partial action approach maintains overall transmission efficiency while providing enhanced reliability where needed.
3Reliability
If multiple messages are transmitted without priority differentiation, then transmission simplicity is maintained, but critical information may be lost in unstable channels
Solution Approach 1:
The patent performs preliminary prioritization of messages before transmission by assigning priority levels based on predefined rules. This preliminary classification allows the system to prepare appropriate error protection strategies in advance, ensuring critical messages are protected without requiring complex real-time decisions during transmission, thus resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent segments the set of CSI messages into different priority groups (high-priority and low-priority messages). This segmentation allows independent error protection strategies to be applied to each group, simplifying the overall mechanism while ensuring critical segmented groups receive appropriate protection levels.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE determines a plurality of messages containing channel state information to be reported to a base station. The UE also determines a priority level for each of the plurality of messages based on at least one predetermined rule. The UE further selects one or more messages from the plurality of messages based on priority levels of the plurality of messages. The UE then sends the selected one or more messages to the base station.