Anticipatory NACK Feedback for Predicted HARQ Decoding Failure
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in power consumption and latency due to the need for decoding attempts that are likely to fail, leading to unnecessary processing and retransmissions.
Innovation Solution
Implementing an anticipatory NACK mechanism in user equipment (UE) that predicts decoding failures with high confidence, allowing the UE to transmit a negative acknowledgment (NACK) before attempting decoding, thereby saving power and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving device attempts to decode the packet and transmit HARQ feedback, then reliable data communication is achieved, but power consumption and latency increase due to unnecessary decoding attempts
Solution Approach 1:
The patent applies preliminary action by performing channel quality assessment and decoding failure prediction before the actual decoding operation. The receiving device evaluates channel conditions, reference signal quality, and predicted SINR to determine in advance whether decoding is likely to fail, thereby avoiding unnecessary decoding attempts and reducing power consumption while maintaining communication reliability through anticipatory NACK transmission.
2Reliability
If the receiving device attempts to decode the packet and transmit HARQ feedback, then reliable data communication is achieved, but latency increases due to decoding processing time
Solution Approach 1:
The patent performs preliminary channel quality assessment and decoding failure prediction before the actual decoding operation. By evaluating channel conditions, reference signal quality, and predicted SINR in advance, the system can transmit anticipatory NACK feedback without waiting for complete decoding, thereby reducing HARQ procedure latency while maintaining communication reliability through the preliminary assessment mechanism.
3Use of energy by moving object
If the receiving device transmits anticipatory NACK based on decoding failure prediction, then power consumption and latency are reduced, but the complexity of the communication protocol increases
Solution Approach 1:
The patent implements preliminary channel quality assessment and decoding failure prediction mechanisms that add protocol complexity but enable anticipatory NACK transmission. The receiving device must evaluate channel conditions, reference signal quality, and predicted SINR before transmission, requiring additional processing logic and protocol elements. However, this complexity is justified by the significant reductions in power consumption and latency achieved through avoiding unnecessary decoding attempts and enabling early retransmission scheduling.
4Loss of time
If the receiving device transmits anticipatory NACK based on decoding failure prediction, then HARQ procedure latency is reduced, but the reliability of error detection may be compromised
Solution Approach 1:
The patent performs preliminary channel quality assessment and decoding failure prediction using multiple indicators including channel state information, reference signal quality, and predicted SINR. This multi-factor assessment mechanism maintains error detection reliability by cross-validating multiple parameters before transmitting anticipatory NACK, reducing false positives while enabling early feedback transmission and reducing HARQ procedure latency.
Data Source
AI summary
Techniques related to using an anticipatory NACK for a decoding failure prediction are disclosed. Some aspects of the disclosure relate to devices and methods for wireless communication including obtaining downlink control information (DCI) including scheduling information for a data transmission over one or more data channel resources. When a predictive channel model predicts a high probability of a decoding failure for the one or more data channel resources, based on the high probability of decoding failure, an anticipatory NACK may be transmitted, indicating an anticipated failure to properly decode the data transmission. Other aspects, embodiments, and features are also claimed and described.