UE RX Beam Pair Selection for Inter-Stream Interference
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Solution Overview
Problem
Conventional beam management methods in wireless communication systems fail to optimize UE RX beams when multiple TRP beams are used, leading to significant inter-stream interference and reduced user throughput due to sub-optimal selection based solely on RSRP.
Innovation Solution
The UE performs two P3 beam sweeps for each TRP beam, storing RSRP values for each UE RX beam, and calculates throughput values considering inter-stream interference to select the best UE RX beam pairs for each panel, using a method that accounts for both TRP beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE selects UE RX beams based solely on RSRP measurements, then the beam selection process is simple and fast, but inter-stream interference increases and user throughput decreases
Solution Approach 1:
The patent applies preliminary action by having the UE perform two P3 beam sweeps in advance to collect RSRP measurements for multiple TRP beams before actual data transmission. This pre-collection of beam measurement data enables the UE to later calculate throughput values and select optimal beam pairs without requiring complex real-time measurements during data transmission, thus improving throughput while managing complexity through advance preparation
Solution Approach 2:
The patent implements feedback by having the UE calculate throughput values based on RSRP measurements from multiple TRP beams and use this feedback information to select the optimal beam pair for data transmission. The throughput calculation considers inter-stream interference between different TRP beams, and the UE feeds back the selected beam pair information to the network for configuring the actual transmission, creating a closed-loop optimization system
2Productivity
If the UE performs two P3 beam sweeps for each TRP beam to consider inter-stream interference, then user throughput is optimized, but the beam management time increases
Solution Approach 1:
The patent applies preliminary action by performing the two P3 beam sweeps in advance before data transmission occurs. The UE collects all necessary RSRP measurements for multiple TRP beams during these preliminary sweeps, storing the measurement data for later use in throughput calculation. This advance data collection eliminates the need for time-consuming real-time measurements during actual data transmission, optimizing throughput while minimizing time loss by preparing all necessary information beforehand
Solution Approach 2:
The patent implements continuity of useful action by having the UE continuously monitor and measure RSRP values during the beam sweeps, maintaining a continuous record of beam measurement data. The UE continuously calculates throughput values based on the collected RSRP measurements and inter-stream interference characteristics, ensuring that the beam selection is based on comprehensive and up-to-date information without requiring repeated time-consuming measurements during data transmission
3Object-affected harmful factors
If conventional beam management methods are used, then the implementation is simple, but inter-stream interference is not minimized
Solution Approach 1:
The patent applies preliminary action by having the UE perform two P3 beam sweeps in advance to collect comprehensive RSRP measurements for multiple TRP beams before data transmission. This pre-collection of measurement data enables the UE to later calculate throughput values that account for inter-stream interference between different TRP beams. By preparing all necessary measurement and calculation work beforehand, the system can accurately minimize inter-stream interference without requiring complex real-time adjustments during data transmission
Solution Approach 2:
The patent implements feedback by having the UE calculate throughput values based on RSRP measurements and inter-stream interference characteristics, then use this feedback to select the optimal beam pair for data transmission. The system feeds back the selected beam pair information to the network, creating a closed-loop optimization that continuously monitors and adjusts beam selection to minimize inter-stream interference, transforming a static simple selection process into a dynamic optimized system
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
During a first P3 sweep that is associated with a first TCI state and during a second P3 sweep that is associated with a second TCI state, the UE stores the RSRP for each UE RX beam for each UE panel. Then, when the UE is scheduled for a downlink transmission through a DCI pointing to two these two TCI states, instead of only selecting the UE RX beam for respective panel based on the highest RSRP, the UE also takes the hypothetical inter-stream interference in to account when selecting the UE RX beams.