Remote Vehicle Diagnostics Using UDT Rate Control
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Solution Overview
Problem
Existing vehicle diagnostic systems face low data transmission efficiency and severe packet loss due to the use of TCP in long-distance connections between vehicle diagnostic devices and remote diagnostic servers, leading to poor performance.
Innovation Solution
Implementing a User Datagram Protocol (UDP)-based data transfer protocol (UDT) for communication between vehicle diagnostic devices and remote diagnostic servers, controlling data transmission rates based on current transmission delay, network state, and load capacity to ensure accurate and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCP is used to maintain long connection for vehicle remote diagnostic, then connection stability is improved, but data transmission efficiency deteriorates and packet loss increases
Solution Approach 1:
The patent changes the fundamental parameter of the transmission protocol from TCP to UDT. This parameter change enables the system to achieve both reliable connection maintenance and high data transmission efficiency by utilizing UDT's unique features such as selective acknowledgment (SACK), fast recovery mechanism, and congestion control algorithms that are optimized for long-distance wireless communications.
Solution Approach 2:
The patent implements dynamic rate adjustment mechanism in UDT that continuously adapts transmission parameters based on real-time network conditions. The system dynamically adjusts the transmission rate according to congestion levels, packet loss rates, and round-trip time, enabling optimal performance across varying network conditions while maintaining connection stability.
2Reliability
If TCP is used for long-distance data transmission, then connection reliability is improved, but transmission efficiency deteriorates due to severe packet loss
Solution Approach 1:
The patent implements comprehensive feedback mechanisms in UDT including selective acknowledgment (SACK) that provides detailed feedback about received and missing packets. This feedback enables the transmitter to quickly identify and retransmit only the lost packets rather than waiting for timeout, significantly reducing packet loss and improving transmission efficiency while maintaining connection reliability.
Solution Approach 2:
The patent employs preliminary actions through UDT's fast recovery mechanism that proactively responds to packet loss before it accumulates. The system uses SACK information to immediately detect and correct transmission errors, and adjusts transmission parameters in advance to prevent future packet loss, rather than reacting after problems occur.
Data Source
AI summary
Disclosed are a data transmission system, method, and apparatus, a device, and a medium, used for solving the problem in the prior art of low data transmission efficiency in a remote vehicle diagnostic process. Specifically, a vehicle diagnostic device establishes a UDT communication connection with a remote diagnostic server, and during a data transmission process, the vehicle diagnostic device periodically determines a current congestion value on the basis of a transmission delay between the vehicle diagnostic device and the remote diagnostic server, a network state of the vehicle diagnostic device, and the load capacity of the remote diagnostic server, and according to a target transmission rate corresponding to the current congestion value, sends a UDT data packet encapsulated by data to be transmitted of a target vehicle.