HARQ-ACK Feedback Handling for Interference in Wireless Systems
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Solution Overview
Problem
The increasing number of user equipment (UEs) and data/control information in wireless communication systems exceeds the limited resources available to base stations (BSs), necessitating an efficient method for transmitting and receiving uplink/downlink data and control information using limited radio resources.
Innovation Solution
A HARQ-ACK feedback method where user equipment (UE) detects downlink control information and performs acknowledgement/negative acknowledgement (ACK/NACK) feedback, dropping transmission of ACK/NACK information if interference exceeds a specific threshold value, and processes HARQ-ACK for downlink data as discontinuous transmission (DTX) in case of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation technology is used to employ more frequency bands, then data throughput increases, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent segments the feedback mechanism by introducing DTX as a distinct state separate from ACK/NACK. This segmentation allows the system to handle interference conditions independently, simplifying resource management while maintaining high throughput through carrier aggregation.
Solution Approach 2:
The patent implements dynamic adaptation by allowing UEs to transition between different feedback states (ACK, NACK, DTX) based on real-time interference conditions. This dynamic approach optimizes resource utilization across multiple carriers without requiring complex manual configuration.
2Adaptability or versatility
If more control information is transmitted to handle increased UEs and data, then system capability improves, but available radio resources are depleted
Solution Approach 1:
The patent extracts the interference indication function from the traditional ACK/NACK feedback mechanism by introducing DTX as a separate state. This extraction reduces the information burden on control channels while maintaining comprehensive system capability to handle various interference scenarios.
Solution Approach 2:
The patent implements an enhanced feedback mechanism where UEs provide interference-aware feedback through DTX states. This feedback loop enables the base station to adaptively adjust resource allocation and transmission parameters, improving system capability while conserving radio resources through intelligent decision-making.
3Reliability
If ACK/NACK feedback is continuously transmitted to ensure reliable communication, then communication reliability improves, but resource efficiency decreases under interference conditions
Solution Approach 1:
The patent applies preliminary anti-action by having UEs proactively indicate interference conditions through DTX states before attempting standard ACK/NACK feedback. This preliminary indication allows the base station to preemptively adjust transmission parameters, ensuring reliable communication while avoiding wasteful retransmissions under severe interference conditions.
Data Source
AI summary
The present invention provides an HARQ-ACK feedback method and device. User equipment of the present invention detects downlink grant downlink control information and performs HARQ-ACK feedback for downlink data corresponding to the downlink control information. The user equipment processes HARQ-ACK for downlink data as a discontinuous transmission (DTX), when there is interference or noise exceeding a threshold value in the downlink data. Therefore, the user equipment can be prevented from receiving the downlink data having a different redundancy version.