Uplink Signal Multiplexing in Dual Connectivity Terminals
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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 frequency bands and coverage areas, leading to potential performance degradation.
Innovation Solution
A user terminal is equipped with a transmission section that multiplexes uplink signals from different RATs using a single uplink carrier, employing frequency division multiplexing, time division multiplexing, or multiplexing techniques to ensure proper transmission, and a control section that manages the multiplexing and transmission power based on path loss and signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple uplink signals of different RATs are transmitted simultaneously using separate carriers, then the coverage and reliability of each signal is improved, but the device complexity and potential for inter-modulation interference increases
Solution Approach 1:
The patent combines multiple uplink signals from different RATs (e.g., LTE and NR) into a single uplink carrier for transmission. Instead of using separate carriers for each RAT, the invention merges the signals and transmits them together, reducing the number of carriers needed and simplifying the system architecture while maintaining transmission reliability
Solution Approach 2:
The patent introduces a base station as an intermediary that receives and processes multiple uplink signals from different RATs through a single carrier. The base station acts as a mediator that handles the complexity of multi-RAT signal processing, allowing the user terminal to transmit signals more simply while the intermediary manages the technical challenges of signal integration
2Adaptability or versatility
If multiple uplink signals of different RATs are transmitted simultaneously using separate carriers, then the adaptability to different RAT requirements is improved, but the loss of time for signal processing and coordination increases
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure the uplink carrier parameters and signal allocation before actual transmission. The base station prepares the carrier configuration in advance, including resource allocation and signal timing, so that when multiple RAT signals need to be transmitted, the coordination is already established and no additional time is needed for real-time negotiation
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the uplink carrier configuration to be adjusted based on the specific RAT requirements. The system can dynamically allocate different resources within the single carrier to accommodate different RAT signals, and can adapt the transmission parameters according to the current network conditions and signal priorities
3Device complexity
If multiple uplink signals are multiplexed in a single carrier, then the device complexity is reduced, but the measurement precision and signal quality control becomes more difficult
Solution Approach 1:
The patent applies segmentation by dividing the single uplink carrier into distinct resource regions or time slots for different RAT signals. Within the unified carrier, the system segments the signal resources so that each RAT signal can be measured and controlled independently, allowing for precise signal quality assessment while maintaining the benefits of a single carrier structure
Solution Approach 2:
The patent implements feedback mechanisms where the base station receives quality measurements for each multiplexed signal and adjusts the transmission parameters accordingly. The system continuously monitors the signal quality of each RAT component and provides feedback to optimize the multiplexing configuration, ensuring that signal quality control is maintained even when multiple signals share a single carrier
Data Source
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Figure 3A~3C
AI summary
A terminal comprising: a control section configured to, when the terminal is configured with dual connectivity using a first radio access technology, RAT, and a second RAT, control mapping, in a frequency band used in the first RAT, of a first uplink, UL, signal in the first RAT and a second UL signal in the second RAT; and a transmission section configured to transmit, using the frequency band used in the first RAT, the first UL signal and the second UL signal, characterized in that the control section is configured to, if a transmission timing for the first UL signal and a transmission timing for the second UL signal overlap, perform control so as not to transmit the second UL signal. A radio base station and a radio communication method are also provided.