Dynamic Beam Parameter Selection for Uplink Channel Access
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Solution Overview
Problem
In 5G New Radio (NR) systems, the use of massive MIMO technology leads to varying interference conditions across different beam directions, and conventional Listen Before Talk (LBT) methods struggle to quickly adjust beams in response to changing channel or interference environments, resulting in low channel access chances and reduced uplink transmission quality.
Innovation Solution
A method where User Equipment (UE) dynamically determines a second receiving parameter group from multiple parameter groups within a limited beam scope, allowing for adaptive beamforming to improve channel access and increase system capacity by transmitting or dropping signals based on real-time access detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LBT methods are used with pre-allocated beams, then device complexity is reduced, but channel access chance decreases and uplink transmission quality deteriorates due to inability to quickly adjust beams
Solution Approach 1:
The patent applies dynamics by transitioning from static pre-allocated beams to dynamic beam selection based on real-time LBT detection results. The UE determines a second receiving parameter group from multiple parameter groups within a limited beam scope based on interference conditions, enabling quick beam adjustment without complex procedures
Solution Approach 2:
The patent changes receiving parameters dynamically by selecting different receiving parameter groups based on LBT detection outcomes. The first receiving parameter group is used for initial downlink reception, while a second receiving parameter group is selected for uplink transmission based on detected interference conditions, optimizing channel access without increasing overall system complexity
2Reliability
If massive MIMO beamforming is used, then communication quality improves, but interference conditions vary significantly across different beam directions making conventional LBT ineffective
Solution Approach 1:
The patent applies local quality by making LBT detection and beam selection specific to each beam direction. Instead of using a single quasi-omnidirectional LBT approach, the UE performs access detection tailored to the specific beam direction being used for uplink transmission, accounting for the varying interference conditions in different spatial directions
Solution Approach 2:
The patent uses feedback from downlink reception to inform uplink transmission decisions. The UE receives downlink signals using a first receiving parameter group, detects interference conditions, and uses this feedback to select an appropriate second receiving parameter group for uplink transmission, creating a closed-loop system that adapts to beam-directional interference
3Productivity
If pre-allocated beams are used for grant free uplink transmission, then device complexity is reduced, but channel access chance decreases due to slow beam update speed
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple receiving parameter groups within a limited beam scope before uplink transmission. When LBT detection indicates good channel conditions, the UE can quickly switch to an appropriate pre-prepared parameter group, enabling fast channel access without real-time beam optimization complexity
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 a first radio signal, receives first information, and then performs a first access detection for determining whether an uplink transmission is performed at a first time on a first sub-band; if so, transmits a second radio signal by a second antenna port group at the first time on the first sub-band; if not, drops transmission of a second radio signal at the first time on the first sub-band; wherein a first receiving parameter group is used for receiving the first radio signal, and a second receiving parameter group is used for generating the second antenna port group. The above method improves uplink channel access chance, thus increasing the system capacity.