Continuous Data Packet Transmission for URLLC Latency
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Solution Overview
Problem
In 5G mobile communication, existing data transmission mechanisms, such as LTE, face challenges in achieving low latency and high reliability for Ultra-Reliable Low-latency Communication (URLLC) services due to the 'transmitting-waiting-transmitting' approach, which results in prolonged transmission latency and reduced reliability due to higher probabilities of Negative ACKnowledgment (NACK) feedback.
Innovation Solution
A method where a transmitter continuously transmits multiple data packets carrying the same information to a receiver until feedback is received, allowing for immediate re-detection and adjustment of transmission patterns based on feedback, improving reliability and reducing latency by diversifying transmission patterns and using feedback to determine subsequent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter waits for feedback information before retransmitting data packets, then the transmission reliability can be ensured through HARQ mechanism, but the transmission latency increases significantly
Solution Approach 1:
The transmitter sends multiple data packets carrying the same information in advance before receiving feedback information. This preliminary transmission ensures that if the receiver correctly receives any packet, it can immediately send an ACK, reducing latency. The invention prepares multiple copies of data ahead of time, so that retransmission is not delayed by waiting for feedback.
Solution Approach 2:
The transmitter continuously transmits data packets without interruption while waiting for feedback information. Instead of stopping transmission to wait for feedback, the system maintains continuous transmission of multiple copies, ensuring that the useful action of data transmission continues uninterrupted, thereby reducing overall latency while maintaining reliability through multiple transmission attempts.
2Loss of time
If the transmitter sends only one data packet, then the transmission latency is minimized, but the transmission reliability decreases due to higher probability of NACK feedback
Solution Approach 1:
The invention applies different transmission strategies to different data packets. Each data packet is transmitted with specific local optimizations, such as using different transmission patterns or resources for different packets, allowing the system to maintain low latency for each packet while ensuring overall reliability through the diversity of multiple transmission attempts.
Solution Approach 2:
The system uses a composite transmission approach where multiple data packets are sent together as a composite transmission unit. This composite strategy combines multiple copies of the same information with different transmission characteristics, creating a robust transmission system that achieves both low latency and high reliability through the combined effect of multiple packets.
3Device complexity
If the transmitter uses a fixed transmission pattern, then the device complexity is reduced, but the adaptability to channel conditions decreases
Solution Approach 1:
The transmission pattern is made dynamic rather than fixed. The transmitter can adapt the transmission pattern based on feedback information and channel conditions. This dynamic approach allows the system to change transmission characteristics (such as time-frequency resources, modulation schemes) in response to varying channel conditions, improving adaptability without significantly increasing device complexity through simple state-based adjustments.
Solution Approach 2:
The invention changes transmission parameters dynamically based on channel conditions and feedback. Instead of using a fixed transmission pattern, the system adjusts parameters such as transmission power, time-frequency resources, and modulation schemes according to the received feedback and channel state, thereby improving adaptability while maintaining manageable complexity through parameter optimization.
Data Source
AI summary
Disclosed are a method and device for data transmission. The method comprises: before a transmitting end receives feedback information, the transmitting end continually transmits multiple packets carrying same information to the receiving end, the feedback information carrying indication information used for indicating whether the receiving end correctly receives at least some packets of the multiple packets; the transmitting end receives the feedback information transmitted by the receiving end; and the transmitting end transmits subsequent data on the basis of the feedback information. In the solution, the transmitting end can continually transmit multiple packets carrying same information to the receiving end until the transmitting end receives the feedback information transmitted by the receiving end, and the transmitting end then determines subsequent data transmission on the basis of the feedback information. In such data transmission mechanism, because a transmitting end continually transmits packets carrying same information to a receiving end, the reliability of data transmission is increased.