Terminal FTN Slot Pattern Adaptation
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Solution Overview
Problem
The integration of Faster-Than-Nyquist (FTN) transmission in TDD-UL-DL radio communication systems poses challenges due to mismatches in slot and symbol boundaries between uplink and downlink, leading to inter-symbol and inter-subcarrier interference, which affects spectral efficiency.
Innovation Solution
A terminal equipped with an FTN demodulation module and a control unit that adapts the configuration of uplink and downlink slot patterns using a reference subcarrier spacing, allowing for appropriate operation even when FTN is applied, by determining the equivalent subcarrier spacing based on the FTN modulation factor and applying configurations similar to those without FTN for TDD-UL-DL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FTN transmission is applied to improve spectral efficiency, then spectral efficiency is improved, but slot and symbol boundary mismatches occur between uplink and downlink
Solution Approach 1:
The patent introduces dynamic adjustment of slot patterns and symbol boundaries based on FTN modulation factors. The system adapts the slot pattern configuration dynamically when FTN is applied, allowing the boundary positions to shift according to the FTN modulation factor while maintaining proper alignment through coordinated updates of slot pattern indicators and boundary position information.
Solution Approach 2:
The patent changes the parameters of slot patterns and symbol boundaries in response to FTN transmission. By modifying the slot pattern configuration parameters and adjusting boundary positions based on FTN modulation factors, the system maintains alignment precision while enabling higher spectral efficiency through FTN signaling.
2Productivity
If FTN transmission is applied to increase communication capacity, then communication capacity is improved, but inter-symbol interference and inter-subcarrier interference occur
Solution Approach 1:
The patent converts the potential harm of boundary mismatches into a benefit by using the FTN modulation factor to deliberately control and coordinate boundary shifts. The interference that would normally result from misalignment is transformed into a manageable parameter through explicit signaling of slot patterns and boundary positions, allowing the system to operate in the FTN regime while maintaining signal integrity.
Solution Approach 2:
The patent introduces slot pattern indicators and boundary position information as intermediary elements that mediate between the FTN transmission requirements and the TDD-UL-DL configuration. These intermediaries carry the necessary alignment information between different communication directions, enabling coordinated operation despite the different symbol rates caused by FTN modulation.
3Adaptability or versatility
If different slot patterns are used for FTN and non-FTN cases, then operational flexibility is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal slot pattern configuration mechanism that serves both FTN and non-FTN cases. The same slot pattern indication framework and boundary management system is used regardless of whether FTN is applied, with the difference being in the specific parameter values and coordination requirements. This multi-functional approach allows the system to handle different transmission modes through a unified configuration paradigm.
Data Source
AI summary
A terminal receives a radio frame having a second slot pattern to be used in a case in which a modulation system (FTN) different from a modulation system in a case of using a first slot pattern is applied. The terminal applies for the second slot pattern a configuration of an uplink and a downlink according to a time division duplex in the radio frame by using a reference subcarrier spacing same as that for the first slot pattern.