Wireless Slot Partitioning for URLLC Feedback Reliability
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Solution Overview
Problem
Current 5G new radio (NR) networks support only single feedback transmission per slot, which limits the ability to meet the low latency and high reliability requirements of ultra-reliable-low latency communications (URLLC), necessitating additional feedback transmissions per slot.
Innovation Solution
The method involves partitioning a slot into multiple virtual mini-slots, allowing for the determination and transmission of feedback within each mini-slot, with the configuration being dynamically or semi-statically set by the base station or device, enabling multiple feedback transmissions per slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single feedback transmission per slot is used, then device complexity is reduced, but reliability and latency performance deteriorate
Solution Approach 1:
The slot is divided into multiple virtual mini-slots, each capable of carrying independent feedback transmissions. This segmentation allows multiple feedback opportunities within a single slot, improving reliability without requiring additional slots while managing complexity through structured time-division multiplexing.
2Loss of time
If single feedback transmission per slot is used, then device complexity is reduced, but latency increases
Solution Approach 1:
By partitioning the slot into virtual mini-slots, the system enables multiple feedback transmission opportunities within the same slot duration. This reduces feedback latency as acknowledgments can be sent earlier in the slot rather than waiting for a single later transmission point, while maintaining manageable complexity through standardized procedures.
3Reliability
If multiple feedback transmissions per slot are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The system dynamically determines which virtual mini-slots contain feedback transmissions based on the actual timing of downlink communications. This dynamic adaptation allows multiple feedback transmissions when needed for reliability while avoiding unnecessary complexity when single transmissions suffice, balancing performance and complexity based on real-time conditions.
4Loss of time
If multiple feedback transmissions per slot are implemented, then latency is reduced, but device complexity increases
Solution Approach 1:
The virtual mini-slot structure provides naturally defined transmission opportunities that reduce latency by enabling feedback as soon as processing is complete, rather than waiting for slot boundaries. The segmentation creates clear temporal structure that manages complexity through predictable patterns while achieving lower latency through multiple potential transmission points.
Data Source
AI summary
Aspects described herein relate to partitioning slots in wireless communications into virtual mini-slots at least for the purpose of transmitting multiple feedback transmissions within the slot.