ACK Information Transmission in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately transmitting and receiving acknowledgement (ACK) information between User Equipment (UE) and Base Station (BS), particularly in scenarios involving multiple transmission blocks (TBs) and code block groups (CBGs), leading to potential mismatches in ACK information.
Innovation Solution
The method involves configuring the UE and BS to support simultaneous transmission and reception of TB-based and CBG-based ACK information, ensuring accurate configuration and scheduling of downlink data signals to prevent ACK information mismatches, allowing for synchronized ACK transmission and reception based on higher layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CBG-based ACK information transmission is configured, then retransmission efficiency is improved, but complexity of ACK information management increases
Solution Approach 1:
The patent segments the ACK information management by introducing separate Counter DAI and Total DAI fields that operate at the CBG level. This segmentation allows independent tracking of each CBG's acknowledgment status, enabling selective retransmission of only failed CBGs rather than entire TBs, thus improving retransmission efficiency while maintaining manageable complexity through structured information fields.
Solution Approach 2:
The patent changes the granularity parameter of ACK information from TB-level to CBG-level. By introducing CBG-level DAI fields and modifying the HARQ-ACK codebook structure to reflect CBG-level acknowledgments, the system achieves finer control over retransmission processes, improving efficiency while the standardized parameter changes keep the complexity manageable.
2Adaptability or versatility
If TB-based and CBG-based ACK information are transmitted simultaneously, then system adaptability is improved, but risk of ACK information mismatch increases
Solution Approach 1:
The patent introduces Total DAI as an intermediary mechanism that mediates between TB-based and CBG-based ACK information. The Total DAI field provides a unified counting reference that both TB-level and CBG-level acknowledgments can reference, ensuring consistency and preventing mismatches when both modes operate simultaneously, thus maintaining reliability while enabling adaptability.
Solution Approach 2:
The patent creates a universal DAI framework where Counter DAI and Total DAI fields serve multiple functions: they track CBG-level acknowledgments, provide TB-level summary information, and enable both CBG-based and TB-based retransmission modes to operate from a common information base. This multi-functionality ensures consistency across different transmission modes, preventing mismatches while maintaining system adaptability.
3Reliability
If CBG-based retransmission is implemented, then data transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by implementing CBG-level DAI fields and detailed acknowledgment tracking only when CBG-based retransmission is actually configured and needed. When CBG-based mode is not in use, the system reverts to simpler TB-level acknowledgments. This selective implementation provides enhanced reliability when required while minimizing signaling overhead in scenarios where full CBG-level management is unnecessary.
Data Source
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AI summary
The present invention discloses a method for transmitting or receiving ACK response information between a UE and a BS in a wireless communication system and an apparatus for supporting the same.