User Terminal Uplink Signal Time-Division Multiplexing
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Solution Overview
Problem
In non-stand-alone radio communication systems, there is a high likelihood that multiple uplink signals from different radio access technologies (RATs) cannot be transmitted properly due to differences in carrier frequencies and duplexing methods, leading to coverage issues and performance degradation.
Innovation Solution
A user terminal is designed to transmit uplink signals from different RATs at different times using specific uplink carriers, with a control section managing the switching between these carriers to avoid interference and ensure proper transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple uplink signals from different RATs are transmitted simultaneously, then the data rate and connectivity capability are improved, but transmission reliability deteriorates due to inter-modulation effects and interference
Solution Approach 1:
The patent applies periodic action by implementing time-division multiplexing where uplink signals from different RATs are transmitted in alternating time periods rather than simultaneously. The control section switches between first RAT and second RAT at different time instances, eliminating inter-modulation effects while maintaining periodic connectivity to both networks
Solution Approach 2:
The patent segments the uplink transmission time into distinct intervals for different RATs. The transmission section transmits uplink signals for the first RAT during first time periods and uplink signals for the second RAT during second time periods, dividing the transmission resource to avoid interference while maintaining both connections
2Adaptability or versatility
If multiple uplink signals from different RATs are transmitted simultaneously, then the connectivity capability is improved, but transmission quality deteriorates due to inter-modulation effects
Solution Approach 1:
The control section implements periodic switching between first RAT and second RAT transmissions, creating time-separated transmission intervals that eliminate inter-modulation effects while maintaining adaptability to connect with multiple RATs through time-division multiplexing
Solution Approach 2:
The patent extracts the harmful inter-modulation effect by separating the transmission times of different RATs. The control section identifies and removes the simultaneous transmission condition that causes inter-modulation, transmitting each RAT's uplink signals in dedicated time slots
Data Source
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AI summary
A user terminal comprises a transmission section that transmits a first uplink (UL) signal of a first radio access technology (RAT) and a second UL signal of a second RAT, at different times; and a control section that controls switching between a first time, which is used to transmit the first UL signal using a first UL carrier of the first RAT, and a second time, which is used to transmit the second UL signal using a second UL carrier of the second RAT.