UE Time-Domain Resource Management for LBT Interference
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Solution Overview
Problem
In 5G New Radio (NR) systems, the challenge is to acquire precise channel information and improve system capacity due to limitations in hardware size and implementation costs, particularly when using Unlicensed Spectrum, where Listen Before Talk (LBT) techniques can lead to resource wastage and interference from multiple transmitters.
Innovation Solution
A method is proposed where the User Equipment (UE) receives information to manage time-domain resources for radio signals, performing access detections to determine whether to transmit on reserved resources, ensuring orthogonality and optimizing the use of multicarrier symbols for channel estimation and data transmission, thereby enhancing system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Listen Before Talk (LBT) technique is adopted to prevent interference on Unlicensed Spectrum, then interference from multiple transmitters is reduced, but resource wastage occurs when LBT fails and reserved time-domain resources cannot be utilized
Solution Approach 1:
The patent changes the state of reserved time-domain resources from idle to active by allowing dynamic transmission of target radio signals when LBT fails. The base station configures multiple time-domain resources including reserved resources, and the UE dynamically decides whether to transmit SRS or target radio signals on these reserved resources based on LBT outcomes, thereby converting wasted resources into useful transmission opportunities.
2Measurement precision
If antenna switching is implemented to acquire complete downlink channel information, then channel estimation precision is improved, but device complexity and hardware requirements increase
Solution Approach 1:
The patent makes the reserved time-domain resources multi-functional: they can serve as SRS transmission resources when LBT succeeds, or as target radio signal transmission resources when LBT fails. This universal usage of the same physical resources for different purposes eliminates the need for additional dedicated resources, reducing hardware complexity while maintaining channel estimation precision through SRS transmission.
3Reliability
If reserved time-domain resources are allocated for antenna switching and SRS transmission, then channel information acquisition is enabled, but system capacity is reduced when these resources remain idle due to LBT failure
Solution Approach 1:
The patent introduces dynamic resource allocation where the function of reserved time-domain resources changes based on real-time LBT outcomes. When LBT fails, the system dynamically switches the reserved resources from SRS transmission mode to target radio signal transmission mode, ensuring continuous resource utilization and maintaining system capacity while still enabling channel information acquisition when LBT succeeds.
Data Source
AI summary
The present disclosure provides a method and device in a User Equipment (UE) and a base station used for wireless communications. The UE receives first information, the first information being used to indicate a first time-domain resource and a second time-domain resource in a first sub-band, wherein the first time-domain resource is reserved for a first radio signal; performs a first access detection to determine whether to transmit the first radio signal on the first time-domain resource in the first sub-band; and transmits the first radio signal on the first time-domain resource in the first sub-band, and does not transmit any radio signal on a reserved time-domain resource in the first sub-band; or, the UE drops transmitting the first radio signal on the first time-domain resource in the first sub-band. The reserved time-domain resource is located between the first time-domain resource and the second time-domain resource in time domain.