ACK/NACK Feedback Timing Determination for Low Latency Wireless
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and NR technologies, face challenges in achieving low latency and efficient acknowledgement (ACK) or negative acknowledgement (NACK) feedback mechanisms, which are crucial for improving spectral efficiency and supporting increasing mobile broadband demands.
Innovation Solution
The proposed solution involves determining a processing time for downlink data communications based on whether they were scheduled via preconfigured scheduling or a downlink grant, and whether the communication is an initial transmission or a retransmission, to optimize the timing for transmitting ACK/NACK feedback, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a downlink data communication is scheduled via a downlink grant received in a downlink control channel, then the scheduling flexibility and reliability are improved, but the processing time and latency increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring scheduling parameters and processing time values before they are needed. The UE is provided with a set of processing time values corresponding to different scenarios (initial transmission, retransmission, preconfigured scheduling, dynamic scheduling) in advance, so that when a downlink data communication occurs, the appropriate processing time can be immediately selected without calculation or negotiation, thus reducing latency while maintaining reliable scheduling
Solution Approach 2:
The patent implements dynamics by making the processing time adaptive and scenario-dependent. Instead of using a fixed processing time for all cases, the system dynamically selects from multiple pre-configured processing time values based on the specific scenario (initial transmission vs. retransmission, preconfigured scheduling vs. dynamic scheduling). This allows the system to optimize processing time for each scenario, reducing overall latency while maintaining scheduling flexibility and reliability
2Loss of time
If the processing time for downlink data communication is reduced, then the latency is decreased, but the processing accuracy and reliability may deteriorate
Solution Approach 1:
The patent applies local quality by providing different processing time values optimized for different local scenarios. Instead of using a single processing time for all cases, the system has separate pre-configured processing time values for initial transmissions, retransmissions, preconfigured scheduling, and dynamic scheduling. Each scenario gets the appropriate processing time needed for its specific requirements, ensuring processing accuracy is maintained where needed while reducing latency where possible
Solution Approach 2:
The patent implements parameter changes by varying the processing time parameter based on the communication scenario. The system changes the processing time parameter from a fixed value to a set of configurable values that can be selected based on the specific situation. This allows the processing time to be optimized for each scenario, reducing overall latency while maintaining the processing accuracy required for reliable communication
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a downlink data communication. The UE may determine a processing time for the downlink data communication based at least in part on at least one of: whether the downlink data communication was scheduled via preconfigured scheduling or via a downlink grant received in a downlink control channel, or whether the downlink data communication is an initial transmission or a retransmission. The UE may transmit acknowledgement or negative acknowledgement (ACK/NACK) feedback, corresponding to the downlink data communication, using a timing indicated by the processing time. Numerous other aspects are provided.