PUCCH Resource Segmentation for URLLC Latency
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Solution Overview
Problem
Current wireless telecommunications systems face challenges in efficiently supporting diverse devices with varying data traffic profiles, particularly in achieving low latency and high reliability for Ultra Reliable and Low Latency Communications (URLLC) services, which are critical for applications like factory automation and autonomous vehicles.
Innovation Solution
The proposed solution involves modifying acknowledgment signalling handling in wireless telecommunications networks by using different PUCCH resources for positive (ACK) and negative (NACK) HARQ feedback, allowing for earlier transmission of NACKs to reduce latency and maintaining efficient multiplexing of ACKs, thereby optimizing radio resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If different PUCCH resources are used for ACK and NACK transmissions, then latency for retransmissions is reduced, but device complexity increases
Solution Approach 1:
The patent segments the acknowledgment signaling resources by creating separate PUCCH resources for ACK and NACK transmissions. This segmentation allows NACK signals to be transmitted independently and earlier than ACK signals, reducing the latency for retransmission requests without requiring complete redesign of the acknowledgment mechanism.
Solution Approach 2:
The patent implements preliminary action by allocating specific PUCCH resources for NACK transmissions in advance, allowing the terminal device to immediately transmit NACK signals when decoding fails, without waiting for the standard ACK timing. This preliminary resource allocation reduces the time loss for retransmission initiation.
2Productivity
If earlier NACK transmission is enabled, then productivity is improved, but radio resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies local quality by assigning different temporal and frequency characteristics to ACK and NACK PUCCH resources. NACK resources are configured to transmit earlier and potentially on different physical resources than ACK resources, optimizing the local transmission characteristics for each signal type to balance productivity improvement with resource efficiency.
Data Source
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AI summary
A method of operating a terminal device in a wireless telecommunications system, the method comprising: attempting to decode a transmission of data to the terminal device; determining whether or not the data was successfully decoded; and transmitting acknowledgement signalling indicating whether or not the data was successfully decoded on radio resources that are determined by taking account of whether or not the data was successfully decoded.