Wireless A/N Feedback Alignment via 1-Bit Indicator
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signal transmission and reception processes, particularly in handling acknowledgment/negative acknowledgment (A/N) information and data transmission in unlicensed bands, leading to potential errors and unnecessary retransmissions due to misalignment in A/N feedback states between base stations and user equipment.
Innovation Solution
A method and apparatus that utilize a 1-bit indicator in downlink control information to determine the generation of second A/N information, reflecting only the data reception state when the indicator is toggled, or considering both first A/N information and data reception state when not toggled, to align A/N feedback with the base station's reception status, thereby preventing errors and optimizing channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If A/N information is transmitted without considering base station reception status, then transmission simplicity is maintained, but feedback accuracy deteriorates causing errors and unnecessary retransmissions
Solution Approach 1:
The base station performs preliminary actions by toggling the 1-bit indicator in downlink control information to indicate its reception status before the user equipment generates A/N feedback. This allows the UE to adjust its feedback generation in advance, ensuring alignment with the BS's actual reception state and improving feedback accuracy without complex post-processing
Solution Approach 2:
A feedback mechanism is established where the base station's reception status (encoded in the 1-bit indicator) is fed back to the user equipment. The UE uses this feedback information to dynamically adjust its A/N feedback generation, creating a closed-loop system that improves reliability by ensuring feedback accuracy while maintaining relatively simple processing logic
2Loss of information
If A/N feedback is generated considering all historical data states, then feedback completeness is improved, but processing complexity and error propagation increase
Solution Approach 1:
The base station performs preliminary action by setting the 1-bit indicator to reflect its reception status before the UE generates feedback. This preliminary indication allows the UE to selectively process only relevant data states (those after the indicated point), preventing error propagation from historical data while maintaining feedback completeness for relevant information
Solution Approach 2:
The feedback process is segmented into two parts: historical data before the indicated point (which the BS has already received or doesn't need) and current data after the indicated point (which needs feedback). The 1-bit indicator acts as a segmentation point, allowing the UE to focus processing only on relevant segments, reducing complexity while maintaining necessary feedback completeness
Data Source
AI summary
The present invention relates to a wireless communication system and, specifically, to a method comprising the steps of: transmitting first A/N information; receiving one or more data after transmitting the first A/N information; receiving downlink control information including a 1-bit indicator; and transmitting second A/N information including an A/N result for the one or more data depending on whether the 1-bit indicator is toggled, and to an apparatus therefor, wherein the second A/N information is generated by reflecting only a data reception state after the transmission of the first A/N information, on the basis of a case where the 1-bit indicator has been toggled; and the second A/N information is generated in consideration of (i) the first A/N information and (ii) the data reception state after the transmission of the first A/N information, on the basis of a case where the 1-bit indicator has not been toggled.