PUSCH Time Resource Allocation Under NR-U LBT Uncertainty
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Solution Overview
Problem
The challenge in 5G NR-U (New Radio-Unlicensed) scenarios is effectively allocating time domain resources to manage interference and ensure efficient data transmission using slots and mini-slots in unlicensed spectrums.
Innovation Solution
A method involving a base station that transmits DCI signaling to indicate time domain resources for PUSCH transmission, including slots and/or mini-slots, with options for starting and ending symbols, redundancy versions, and LBT monitoring to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LBT mechanism is used to monitor PUSCH in unlicensed spectrum, then interference from neighboring base stations is avoided, but transmission success rate is reduced due to channel access uncertainty
Solution Approach 1:
The base station performs LBT monitoring and determines channel access status before allocating time domain resources to the terminal. This preliminary action ensures that only resources where the channel is clear are allocated, preventing interference from neighboring base stations while guaranteeing transmission success. The terminal then performs PUSCH transmission only in the pre-validated resources.
2Reliability
If multiple subframes are scheduled with independent RV configuration, then data transmission reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The time domain resource is segmented into multiple slots or mini-slots, each with independently configurable RV parameters. This segmentation allows the system to achieve diverse transmission strategies across different time units, improving reliability through redundancy while maintaining manageable complexity through modular configuration of each segment.
3Ease of operation
If time domain resources are allocated at subframe level, then resource allocation granularity is coarse and management is simple, but spectrum efficiency is reduced
Solution Approach 1:
The subframe is divided into smaller units of slots and mini-slots for resource allocation. This segmentation provides finer granularity than traditional subframe-level allocation, enabling more flexible and efficient spectrum utilization while maintaining simplified management through the standardized slot and mini-slot structures defined in the patent.
Data Source
AI summary
A base station transmits downlink control information, DCI, signaling. The DCI signaling indicates a time domain resource to be used to perform physical uplink shared channel, PUSCH, by a terminal. The time domain resource includes at least one slot, at least one mini-slot, or both the at least one slot and at least one mini-slot.