Vehicle Full-Duplex Mode Control for Spectral Efficiency
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Solution Overview
Problem
In wireless communication networks, vehicles face challenges in optimizing data transmission performance due to interference when trying to communicate with a base station, especially when the signal quality is insufficient, leading to suboptimal data rate and spectral efficiency in half-duplex mode.
Innovation Solution
A method is introduced to determine conditions under which a vehicle can switch to full-duplex mode, allowing simultaneous data transmission and reception using the same radio resource, by evaluating self-interference and signal-to-interference-plus-noise ratios, thereby reducing transmission time and improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vehicle operates in half-duplex mode to avoid self-interference, then signal quality is maintained, but data transmission rate and spectral efficiency are reduced
Solution Approach 1:
The patent implements dynamic mode selection between half-duplex and full-duplex operations based on real-time channel conditions. The system evaluates signal-to-interference-plus-noise ratios and self-interference levels to determine when full-duplex mode can be activated, allowing the vehicle to adapt its transmission mode dynamically rather than being fixed in half-duplex mode. This resolves the contradiction by enabling full-duplex operation (higher data rate) when channel conditions permit, while falling back to half-duplex mode (better signal quality) when conditions are poor.
Solution Approach 2:
The patent changes the operational parameter from fixed half-duplex mode to conditional full-duplex mode by modifying the duplexing parameter based on evaluated conditions. The system calculates whether specific mathematical conditions are met (comparing self-interference levels against threshold values derived from channel state information) to switch between operational modes. This parameter change enables the system to achieve higher spectral efficiency when conditions allow, while maintaining signal quality when conditions are adverse.
2Productivity
If a vehicle uses full-duplex mode to transmit and receive data simultaneously, then spectral efficiency is improved, but self-interference degrades signal quality
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously evaluates channel state information, signal-to-interference-plus-noise ratios, and self-interference levels to determine whether full-duplex mode should be activated. The controller uses this feedback to make informed decisions about mode selection, ensuring that full-duplex operation (which improves spectral efficiency) is only activated when the evaluated conditions indicate that signal quality will not be compromised. This feedback loop resolves the contradiction by preventing full-duplex operation when self-interference would degrade signal quality below acceptable thresholds.
Solution Approach 2:
The patent performs preliminary evaluation of channel conditions and self-interference levels before activating full-duplex mode. The system calculates whether specific mathematical conditions are met (comparing measured parameters against threshold values) in advance of mode switching. This preliminary assessment ensures that full-duplex mode is only activated when conditions are favorable, preventing signal quality degradation from excessive self-interference while still enabling spectral efficiency improvements when conditions permit.
3Loss of time
If a vehicle operates in full-duplex mode to reduce transmission time, then productivity increases, but interference from other devices affects performance
Solution Approach 1:
The patent uses feedback from channel state information and interference measurements to dynamically determine when full-duplex mode should be activated. The system continuously monitors the radio environment, including interference from other communication devices, and uses this feedback to make informed decisions about mode selection. Full-duplex operation (which reduces transmission time) is only activated when the feedback indicates that interference levels are acceptable and will not compromise communication reliability. This resolves the contradiction by enabling time reduction through full-duplex mode only when the harmful interference factor remains within acceptable bounds.
Data Source
AI summary
A method and device are disclosed for controlling a data-transmission mode used by a vehicle to communicate. In one aspect, the control method includes selectively activating, when a predefined condition C1 or C2 is met, a full-duplex data-transmission mode at a first vehicle to communicate with a second vehicle and with a base station of a network to which the first vehicle is connected.