UE Antenna Port Selection for LTE-NR Interference Management
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Solution Overview
Problem
In user equipment (UE) operating in non-standalone (NSA) mode for 5G, the overlapping frequency bands of LTE and NR cause interference, preventing simultaneous use of the same antenna for transmission/reception, leading to inefficiencies in antenna selection and power utilization.
Innovation Solution
A processor in the UE determines the most efficient antenna for LTE or NR connections based on performance factors and implements dynamic antenna selection and power optimization schemes to minimize interference and meet regulatory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same antenna is used for both LTE and NR transmissions, then device complexity is reduced, but interference occurs due to overlapping frequency bands
Solution Approach 1:
The patent segments the antenna resources by time, dividing transmission opportunities into separate slots for LTE and NR. The processor determines which antenna to use based on the transmission type, ensuring that LTE and NR do not transmit simultaneously on the same antenna, thus avoiding interference while maintaining a shared antenna subsystem.
Solution Approach 2:
The patent implements dynamic antenna selection where the processor evaluates multiple factors (signal quality, interference levels, traffic requirements) in real-time to determine the most appropriate antenna for each transmission. This dynamic adaptation allows the system to optimize performance while preventing interference through intelligent resource allocation.
2Productivity
If dynamic antenna selection is implemented, then transmission efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent changes the operational parameters of the antenna system by selecting different antennas based on evaluated factors such as signal quality metrics, interference levels, and traffic priorities. The processor dynamically adjusts antenna selection parameters to optimize transmission efficiency while managing complexity through structured evaluation criteria.
3Productivity
If transmit power is increased for both LTE and NR, then data throughput is improved, but regulatory limits may be exceeded
Solution Approach 1:
The patent applies partial power transmission by selectively allocating transmit power to either LTE or NR based on priority levels and current network conditions. Instead of transmitting at maximum power on both frequencies simultaneously, the system transmits at appropriate power levels on selected antennas, ensuring regulatory compliance while maintaining high throughput through intelligent power management.
Data Source
AI summary
A user equipment (UE) is configured to establish network connections for long-term evolution (LTE) and new radio (NR) radio access technologies (RATs) in non-standalone (NSA) E-UTRA-NR dual connectivity (ENDC) operation. The UE includes a multi-antenna array for data and signaling transmissions and receptions over the LTE and NR connections. The UE determines a most efficient antenna of the multi-antenna array for an operating frequency band of the LTE and NR connections, wherein the most efficient antenna is determined based on at least one performance factor for the UE when using the antenna compared to other antennas of the multi-antenna array, evaluates one or more factors for determining whether the LTE RAT or the NR RAT is to use the most efficient antenna and transmits uplink data on the most efficient antenna via either the LTE RAT or the NR RAT based on the evaluated factors.