Spatially Correlated LBT Channel Monitoring in 5G NR
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Solution Overview
Problem
In the context of 5G New Radio (NR) systems, the challenge is to increase system capacity while avoiding same-frequency interference among multiple transmitters, particularly due to the use of massive MIMO technology and beamforming, which creates varying interference conditions in different beam directions.
Innovation Solution
The proposed method involves a UE and base station communication protocol where the duration of access detection is determined by the spatial relationship and priority classes of correlated antenna port groups, allowing spatially correlated Listen Before Talk (LBT) processes to share channel monitoring, reducing repeated monitoring and increasing access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple transmitters perform LBT independently to avoid interference, then interference avoidance is improved, but channel monitoring time increases and system capacity decreases
Solution Approach 1:
The patent merges multiple spatially correlated LBT processes into a single shared channel monitoring procedure. When antenna port groups are spatially correlated (transmitting in similar directions), their LBT processes share the same channel detection results, eliminating redundant monitoring and reducing overall channel access time while maintaining interference avoidance.
Solution Approach 2:
The patent creates a universal channel monitoring mechanism that serves multiple antenna port groups simultaneously. A single LBT process performed by one antenna port group can provide channel access authorization for other spatially correlated port groups, making the monitoring function universal across multiple transmission streams.
2Reliability
If multiple transmitters perform independent LBT processes, then channel access reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent combines multiple LBT processing tasks into fewer operations by identifying spatial correlations between antenna port groups. When port groups are spatially correlated, their LBT processes are merged, reducing the total number of independent monitoring operations and lowering device complexity while preserving access reliability through shared channel state information.
3Reliability
If beamforming is used to improve communication quality, then signal quality is improved, but interference conditions become more variable and LBT management becomes more complex
Solution Approach 1:
The patent applies local quality by treating spatially correlated antenna port groups differently from non-correlated groups. Port groups transmitting in similar beam directions are grouped together and share LBT processes, while port groups in different directions maintain separate monitoring. This localized approach to LBT management reduces complexity while adapting to the specific interference conditions created by beamforming.
Data Source
AI summary
The present disclosure provides a method and a device in a User Equipment (UE) and a base station used for wireless communications. The UE receives first information and second information, performs a first access detection in a first time window, and then transmits a first radio signal at a first time, or drops transmission of a first radio signal at a first time; wherein the first information indicates configuration information of the first radio signal and a first priority class, and the second information indicates a second priority class, the first radio signal being correlated with a first antenna port group; the first antenna port group is spatially correlated with a second antenna port group, and a relationship between the first priority class and the second priority class is used for determining duration of the first time window.