CSI Feedback Prioritization With Unequal Error Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information (CSI) with unequal error protection, particularly in 5G NR, where not all messages can be correctly recovered due to unstable channel quality, especially for high-speed moving terminals, and there is a need for prioritization and differential error protection levels for critical and non-critical data.
Innovation Solution
The method involves determining priority levels for CSI messages based on predetermined rules and using encoders like Polar codes and Reed-Muller codes to provide unequal error protection (UEP) features, where critical messages are assigned higher error protection levels, ensuring reliable transmission even in unstable channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all CSI messages are transmitted with equal error protection, then the system complexity is low and implementation is simple, but critical messages may be lost in unstable channel conditions
Solution Approach 1:
The patent applies local quality by assigning different error protection levels to different messages based on their priority. High-priority messages (e.g., beam selection indicators) receive stronger error protection through mapping to more reliable encoder input bits, while low-priority messages (e.g., co-phasing indicators) receive lesser protection. This differential protection approach ensures that critical messages are reliably transmitted in unstable channel conditions without uniformly increasing complexity for all messages.
2Reliability
If higher error protection is applied to all messages, then message reliability improves, but spectral efficiency decreases due to increased redundancy
Solution Approach 1:
The patent implements local quality by applying error protection selectively only to high-priority messages that require reliable transmission. By mapping high-priority messages to encoder input bits with higher protection levels and low-priority messages to bits with lower protection levels, the system achieves reliable recovery of critical information without adding redundant protection to all messages, thereby maintaining spectral efficiency.
3Reliability
If more resources are allocated for error protection, then message accuracy improves, but power consumption increases
Solution Approach 1:
The patent applies local quality by allocating error protection resources selectively to high-priority messages that require accurate transmission. The encoder maps high-priority messages to input bits that receive stronger protection, while low-priority messages use fewer protection resources. This approach ensures transmission accuracy for critical messages without unnecessarily consuming power for protecting all messages equally.
4Reliability
If differential error protection is implemented for different messages, then critical information is reliably transmitted, but the encoding and decoding complexity increases
Solution Approach 1:
The patent implements parameter changes by varying the error protection level parameter across different messages based on their priority. The encoder assigns different protection levels to different input bit positions, and the decoder correspondsingly applies different decoding strategies. This parameter-based differentiation enables reliable transmission of critical messages while managing complexity through systematic parameter assignment rather than complex structural changes.
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 priority levels of a plurality of messages based on at least one predetermined rule. The plurality of messages contain channel state information to be reported to a base station. The at least one predetermined rule specifies that a message including an indicator indicating at least one of a beam selection at a particular dimension and an orthogonal beam group selection has a priority level higher than a priority level of a message including an indicator indicating at least one of a beam direction from a group of beam candidates or co-phasing between two sets of antennas for two polarizations. The UE sends, to the base station, one or more messages of the plurality of messages based on the priority levels of the plurality of messages.