Relay Data Transmission with Direct Feedback Link
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Solution Overview
Problem
In existing LTE systems, direct terminal-relay device methods face issues with link failures and inefficient feedback mechanisms, leading to data packet loss when relay links experience problems, as the relay device cannot confirm successful transmission of data packets to either the base station or the terminal.
Innovation Solution
A data transmission method that allows a sending device to send data packets through a first relay device and receive feedback information on successful or unsuccessful reception from the receiving device via pre-configured conditions, enabling timely acquisition of feedback and preventing data packet loss by using alternative communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback is transmitted hop-by-hop through relay devices, then the feedback mechanism is simple to implement, but the sending device cannot obtain real-time feedback when relay links fail, leading to data packet loss
Solution Approach 1:
The patent introduces a direct feedback channel from the receiving device to the sending device that bypasses the relay device. This intermediary direct link allows the sending device to obtain real-time feedback about packet reception status without relying on the relay device to forward feedback messages, thus solving the reliability issue when relay links fail.
Solution Approach 2:
The feedback mechanism is segmented into two independent paths: a hop-by-hop feedback path through the relay device for normal operation, and a direct feedback path from receiving device to sending device for reliability. This segmentation allows the system to use the simple relayed feedback under normal conditions while having a backup direct feedback path activated when relay links fail.
2Productivity
If the relay device discards data packets when backhaul link fails, then the relay device avoids transmitting failed data, but the sending device cannot resend packets through alternative paths without feedback information
Solution Approach 1:
The patent establishes a direct feedback mechanism where the receiving device sends acknowledgment or negative acknowledgment directly to the sending device. This feedback allows the sending device to determine whether packets were successfully received even when the relay backhaul link fails, enabling the sending device to make informed decisions about resending packets through alternative paths.
Solution Approach 2:
The system pre-configures alternative transmission paths and the direct feedback mechanism before link failures occur. When the relay backhaul link fails, the sending device can immediately utilize the pre-established direct feedback information to switch to alternative paths without waiting for relay device notifications, thus maintaining productivity.
3Reliability
If multiple communication paths are maintained for alternative routing, then data transmission reliability improves, but the device complexity and resource consumption increase
Solution Approach 1:
The patent implements dynamic path selection where the system maintains multiple communication paths but activates them based on real-time link status. The direct feedback mechanism provides the information needed to dynamically switch between the relayed path and direct path, maintaining reliability while managing complexity through conditional activation rather than permanent maintenance of all paths.
Solution Approach 2:
The system applies different quality levels to different communication paths based on local conditions. The direct feedback channel provides high-reliability information for critical decision-making, while the relayed feedback path provides sufficient information for normal operation. This local quality differentiation allows the system to maintain reliability where needed without unnecessarily complicating the overall system.
Data Source
AI summary
The present application provides a data transmission method, device and system. The method comprises: a sending device sends a data packet to a receiving device by means of a first relay device, and receives feedback information of the receiving device on the receiving condition of the data packet by means of another communication link according to a predetermined condition. Therefore, the sending device can timely obtain the feedback information of the receiving device on the receiving condition of the data packet by means of another communication link under a predetermined condition.