User Terminal Signal Waveform Selection for 5G TTI Timing
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Solution Overview
Problem
In 5G mobile communication systems, there is a challenge in transmitting multiple signal waveforms with different symbol lengths simultaneously without any symbol spanning across two adjacent Transmission Time Intervals (TTIs).
Innovation Solution
A user terminal and radio communication method that selects and maps signal waveforms with varying symbol lengths within a TTI, ensuring no symbol exceeds the TTI boundary, using a control section to determine the appropriate signal waveform and perform preprocessing, FFT processing, and equalization based on the selected waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple signal waveforms with different symbol lengths are mapped within a TTI, then communication flexibility and adaptability are improved, but symbols may span beyond the TTI boundary causing timing conflicts
Solution Approach 1:
The patent changes the parameter of symbol length by selecting from multiple signal waveform candidates with different symbol lengths (e.g., 71.4 μs for OFDM/DFT-s-OFDM, 66.7 μs for UW-DFT-s-OFDM). The control section determines the appropriate signal waveform based on communication conditions, allowing adaptation to different requirements while maintaining reliable timing within the TTI boundary through careful selection and mapping configuration.
Data Source
AI summary
In user terminal 20, control section 202 determines signal waveforms according to a signal-waveform switching pattern notified by control section 102 of base station 10, and indicates the signal waveforms to preprocessing section 205, signal detection section 207, and post-processing section 208 for each TTI. Configuration IDs are assigned to respective signal-waveform switching patterns, and signal waveforms that are to be transmitted in TTIs and that are specified by the TTI index are configured for each of the Configuration IDs. With this configuration, a plurality of signal waveforms whose symbol lengths are different from one signal waveform to another are used together while no symbol spans two adjacent TTIs.