D2D Preamble Signaling for URLLA
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G cellular communication technologies face challenges in achieving simultaneous high reliability and low latency, particularly in industrial applications requiring ultra-reliable low-latency communications (URLLC) between sensors and actuators, as traditional redundancy methods increase latency and overhead.
Innovation Solution
The system employs a device-to-device (D2D) communication approach where client devices transmit a preamble before data and retransmit if a negative acknowledgement is received, using a processor to manage time and frequency resources efficiently, allowing for direct communication without always relying on the base station, thereby meeting both reliability and latency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundancy is introduced in space, time, and code domain to achieve high reliability, then communication reliability is improved, but latency and overhead increase
Solution Approach 1:
The transmitting device sends a preamble signal before the actual data transmission to reserve radio resources and notify other devices. This preliminary action enables the transmitting device to immediately send data in the next time interval without waiting for scheduling decisions, thereby reducing latency while maintaining reliability through pre-reserved resources
Solution Approach 2:
The system enables autonomous D2D communication where devices self-organize and self-manage resource allocation without continuous base station control. The transmitting device autonomously selects resources based on preamble detection, and receiving devices autonomously decode and acknowledge transmissions, reducing overhead and latency associated with centralized scheduling
2Loss of time
If data is transmitted whenever available to achieve low latency, then latency is reduced, but communication reliability cannot be guaranteed due to collisions and interference
Solution Approach 1:
Before transmitting data, the device first transmits a preamble signal in a first time interval to reserve the radio resources for the subsequent second time interval. This preliminary resource reservation ensures that when data is transmitted immediately in the next time interval, the resources are already secured and free from collisions, thus maintaining both low latency and high reliability
Solution Approach 2:
The receiving device sends feedback signals (ACK/NACK) to the transmitting device to indicate whether data was successfully received. This feedback mechanism allows the transmitting device to verify successful transmission and request retransmission if necessary, thereby guaranteeing communication reliability while maintaining efficient resource usage
Data Source
AI summary
A method comprises listening (151) for transmission of a preamble by a transmitting device to a recipient and receiving (153) data in a second time interval upon receiving the preamble in a first time interval. The second time interval succeeds the first time interval. The method further comprises listening (155) for transmission by the recipient of a message, e.g. a NACK, indicating that data transmitted in the second time interval was not successfully received by the recipient and retransmitting (157) the data in a fourth time interval upon receiving the message in a third time interval.