Wireless Feedback Codebook Combining for Canceled UCI
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Solution Overview
Problem
In wireless communication systems, low-priority uplink control information (UCI) is often canceled due to collisions with high-priority UL service transmissions, leading to inefficiencies in downlink (DL) transmission efficiency as the base station cannot determine the receiving status of DL data, necessitating retransmission of all data.
Innovation Solution
Combining canceled uplink feedback information with previous or subsequent feedback information to form a combined feedback codebook, using operations like 'OR' or bit cascading, and determining feedback based on data reception status to conserve semi-static codebook overhead and reduce DL transmission inefficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-priority UCI transmissions are canceled due to collision with high-priority UL service transmissions, then high-priority service transmission reliability is improved, but DL transmission efficiency deteriorates because the base station cannot determine receiving status and must retransmit all data
Solution Approach 1:
The patent introduces an intermediary feedback mechanism where the UE sends a notification indication to the base station when UCI transmission is canceled. This notification serves as a mediator that informs the base station about the cancellation without requiring full retransmission of DL data, thus resolving the contradiction between maintaining high-priority service reliability and preserving DL transmission efficiency
Solution Approach 2:
The patent implements a feedback loop where the UE provides cancellation notifications to the base station. This feedback mechanism allows the base station to understand which UCI transmissions were canceled and make informed decisions about selective retransmission, improving DL efficiency while maintaining the reliability of high-priority services
2Reliability
If the base station retransmits all DL transmissions when HARQ-ACK feedback is canceled, then feedback information reliability is improved, but transmission resource waste increases
Solution Approach 1:
The patent extracts the essential feedback information (cancellation notification) from the complete HARQ-ACK codebook structure. By separating the cancellation indication from full feedback requirements, the base station can determine which specific transmissions need retransmission rather than retransmitting all DL data, thus reducing energy waste while maintaining necessary reliability
Solution Approach 2:
The patent changes the feedback transmission parameter from complete HARQ-ACK codebook to selective cancellation notification. This parameter change allows the system to adapt feedback granularity, transmitting only the necessary cancellation information rather than complete feedback for all transmissions, thereby reducing resource consumption while maintaining reliability where needed
3Loss of information
If feedback codebook size increases to accommodate multiple DL time slots and component carriers, then feedback completeness is improved, but feedback overhead increases
Solution Approach 1:
The patent extracts only the necessary cancellation indication from the complete feedback codebook structure. By taking out just the essential information (which UCI transmissions were canceled) rather than transmitting complete feedback for all DL time slots and component carriers, the system maintains feedback completeness for critical decisions while significantly reducing feedback overhead
Solution Approach 2:
The patent applies partial action by transmitting only the portion of feedback information that is necessary for maintaining system operation (cancellation notifications) rather than providing complete feedback for all possible DL transmissions. This partial feedback approach prevents information loss for critical decisions while avoiding the excessive overhead of complete feedback transmission
Data Source
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AI summary
Systems and methods for wireless communications are disclosed herein. In one embodiment, a wireless communication device determines that first feedback information indicated to transmit on a first uplink (UL) resource is canceled. The wireless communication device combines the first feedback information with second feedback information indicated to transmit on a second UL resource to generate combined feedback information. The wireless communication device transmits the combined feedback information using the second UL resource.