Feedback Information Codebook Generation for 5G NR-U Carrier Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G NR-U systems, the current method of full HARQ process feedback results in redundant information and reduced reliability due to the need to feed back ACK/NACK feedback for all HARQ processes across multiple carriers, especially when not all carriers are successfully transmitting data, leading to ambiguity and inefficiency in data transmission.
Innovation Solution
A feedback information processing method that includes signaling to indicate which carriers require full HARQ process feedback, allowing the terminal to generate a feedback information codebook only for relevant carriers, reducing the number of bits in the feedback and enhancing transmission reliability by using carrier indication information to specify which carriers to include in the feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full HARQ process feedback is provided for all N carriers, then the feedback information is complete, but the feedback overhead increases and reliability decreases due to redundant information
Solution Approach 1:
The patent extracts and removes redundant feedback information by only including feedback for carriers that actually transmitted data. The terminal device determines which carriers have data transmission and generates feedback codebook only for those carriers, rather than providing feedback for all N carriers. This extraction of necessary information from the complete set eliminates redundancy while maintaining feedback completeness for actual transmissions.
Solution Approach 2:
The patent applies partial action by providing feedback only for the subset of carriers that require it (those with actual data transmission), rather than providing excessive feedback for all carriers. The feedback codebook includes ACK/NACK information only for carriers with data, which is sufficient for reliable communication while reducing overall feedback overhead and improving efficiency.
2Loss of information
If feedback is provided for all carriers, then no ambiguity in HARQ process understanding occurs, but redundant information is transmitted when not all carriers are actively transmitting
Solution Approach 1:
The patent extracts only the necessary HARQ feedback information for carriers that actually transmitted data. The terminal device identifies which carriers have data transmission and generates feedback codebook entries only for those carriers, removing unnecessary feedback entries for inactive carriers. This maintains complete HARQ process information for active transmissions while eliminating redundant information.
Solution Approach 2:
The patent changes the parameter of feedback information content dynamically based on which carriers are actively transmitting. The feedback codebook structure adapts to include only relevant carrier feedback, changing the information content parameter from a fixed complete set to a variable subset based on actual transmission status, thereby reducing redundancy while maintaining necessary information.
3Measurement precision
If carrier indication information is added to specify which carriers require feedback, then feedback precision improves, but signaling overhead increases
Solution Approach 1:
The patent applies self-service by enabling the terminal device to automatically determine which carriers require feedback based on its own knowledge of which carriers transmitted data. The terminal uses its internal state information about active carriers to generate the feedback codebook without requiring external indication from the network, thereby achieving precise carrier identification without additional signaling overhead.
Solution Approach 2:
The patent uses the downlink control information (DCI) as an intermediary that implicitly indicates which carriers require feedback through the scheduling decision itself. Rather than adding separate carrier indication signaling, the presence or absence of scheduling on a carrier serves as the indication mechanism, using existing control channels to convey the necessary information efficiently.
Data Source
AI summary
Disclosed are a feedback information processing method and a related device. The method includes receiving, by a terminal, signaling that is used to determine at least one carrier of N carriers. N is a positive integer. The method also includes generating, by the terminal, a feedback information codebook. The feedback information codebook includes feedback information corresponding to all hybrid automatic repeat request (HARQ) processes within the at least one carrier of the N carriers.