Wireless Feedback Interval Optimization for URLLC Latency
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Solution Overview
Problem
Current wireless communication technologies face challenges in achieving high reliability and low latency, particularly in 5G new radio (NR) systems, as hybrid automatic repeat request (HARQ) retransmissions often increase transmission delay and fail to meet ultra-reliable low latency communications (URLLC) requirements due to inefficiencies in the interval between control or data reception and corresponding feedback.
Innovation Solution
The method involves optimizing the interval between downlink and uplink transmissions by pre-defining or configuring network parameters to reduce the time gap between the reception of control or data and feedback, allowing for more efficient use of air interface resources and faster processing, thereby enhancing communication reliability and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the interval between downlink transmission and uplink feedback is reduced, then transmission latency is decreased, but the processing time for feedback preparation becomes insufficient
Solution Approach 1:
The patent applies preliminary action by having the receiving end start preparing feedback information before the downlink transmission actually ends. The feedback preparation process is initiated in advance during the reception phase, so that when the reduced interval elapses, the feedback is already ready for immediate transmission. This eliminates the need to wait for complete signal processing after reception, thereby reducing latency without compromising feedback preparation quality.
2Reliability
If HARQ retransmissions are used to improve reliability, then communication reliability is enhanced, but transmission delay increases
Solution Approach 1:
The patent implements continuity of useful action by establishing a continuous feedback loop between downlink and uplink transmissions. By reducing the interval between downlink reception and uplink feedback transmission, the system maintains uninterrupted communication flow. This continuous operation reduces the need for retransmissions while keeping the overall transmission delay minimal, thereby achieving both high reliability and low latency simultaneously.
Data Source
AI summary
In one aspect a wireless communications method is disclosed. The method includes transmitting, from a first radio terminal to a second radio terminal, control information or payload data, wherein the receiving and a preparation is completed at a first time. The method further includes receiving, from the second radio terminal, feedback information at an interval later than a last symbol of the transmitted control information or payload data, wherein the interval is pre-defined by a protocol or configured by a network parameter.