Terminal Device Feedback Control for Half-Duplex Reliability
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Solution Overview
Problem
In wireless communication systems employing half-duplex communication, terminal devices fail to detect control information and data from other devices during simultaneous transmission, leading to inadequate retransmission and reduced communication reliability, particularly in scenarios demanding high reliability like autonomous driving.
Innovation Solution
A terminal device is equipped with a wireless communication unit and a control unit that detects simultaneous transmission among devices using control information, enabling the transmission of feedback signals to request retransmission when data channels overlap in time, thereby ensuring data is retransmitted even if the transmitting devices do not request it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If terminal devices perform half-duplex communication to reduce cost, then device complexity is reduced, but communication reliability deteriorates because simultaneous transmissions cannot detect each other's control information
Solution Approach 1:
The patent introduces a feedback mechanism where terminal devices transmit feedback signals (ACK/NACK) on feedback channels to indicate whether data was received correctly. The transmitting device uses this feedback to determine whether retransmission is needed, creating a closed-loop control system that resolves the reliability issue in half-duplex communication
Solution Approach 2:
The feedback channel acts as an intermediary mechanism between transmitting and receiving devices. It carries retransmission control information that mediates the communication process, allowing devices to coordinate their transmissions and receptions even when operating in half-duplex mode
2Productivity
If terminal devices transmit data simultaneously to increase productivity, then data transmission efficiency is improved, but communication reliability deteriorates due to undetected simultaneous transmissions
Solution Approach 1:
The feedback mechanism allows receiving devices to inform transmitting devices about successful or failed data reception. When simultaneous transmissions occur, at least one receiving device can send a NACK feedback signal, triggering retransmission and ensuring data integrity despite the loss of productivity from repeated transmissions
Solution Approach 2:
The system prepares for potential transmission failures by implementing a retransmission control mechanism in advance. Feedback signals and retransmission protocols are established beforehand to cushion against the harmful effects of simultaneous transmissions, ensuring reliability is maintained even when productivity is temporarily reduced
Data Source
AI summary
A terminal device includes wireless communication processor circuitry that transmits and receives signals to and from a first terminal device and a second terminal device, and a controller that detects an occurrence of simultaneous transmission by the first terminal device and the second terminal device on the basis of control information including information that identifies a wireless resource used as the data channel, the control information being received by the wireless communication processor circuitry and transmitted from the first terminal device and the second terminal device by use of a control channel, wherein the wireless communication processor circuitry transmits the signals to at least any one of the first terminal device and the second terminal device through a feedback channel, in a case the simultaneous transmission is detected.