Proxy Device Serial Number Management for Wireless Wired TCP Handoff
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Solution Overview
Problem
Existing network proxy technologies for wireless data transmission in mobile communications networks often degrade the quality of service due to the mismatch between wireless and wired network characteristics, as they rely on TCP congestion control methods designed for wired networks.
Innovation Solution
A data transmission method and system where a proxy device establishes a TCP connection between a client and an Internet server, interacting with the client in a wireless manner and the server in a wired manner, using serial number management to forward data without establishing separate connections, thereby maintaining data integrity and quality of service during client mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a TCP connection is established between client and Internet server through mobile communications network, then data transmission can be achieved, but the quality of service deteriorates due to mismatch between wireless and wired network characteristics
Solution Approach 1:
The patent segments the network path into two distinct parts: a wireless segment (client to proxy device) and a wired segment (proxy device to Internet server). The proxy device acts as an intermediary that separates these two network types, allowing each segment to use appropriate transmission characteristics without interfering with the other.
Solution Approach 2:
The proxy device serves as an intermediary between the client and Internet server. It receives data from the client via wireless connection, manages serial numbers and data segments, and forwards data to the Internet server via wired connection, thereby mediating between the incompatible wireless and wired network characteristics.
2Adaptability or versatility
If network proxy technology is used to divide TCP connection into two parts, then applicability of TCP congestion control method is improved, but the quality of service is degraded
Solution Approach 1:
The patent applies different quality characteristics to different segments of the network. The wireless segment (client to proxy) uses transmission characteristics suitable for wireless networks, while the wired segment (proxy to server) uses characteristics optimized for wired networks. This local differentiation allows each segment to operate at optimal performance.
Solution Approach 2:
The proxy device changes transmission parameters at the boundary between wireless and wired networks. It transforms data from wireless transmission format to wired transmission format, adjusting parameters such as error handling, flow control, and congestion management to match the requirements of each network type.
3Reliability
If serial number management is implemented in proxy device, then data integrity is maintained, but device complexity increases
Solution Approach 1:
The proxy device performs preliminary actions by assigning serial numbers to data segments before forwarding them. This pre-numbering allows the receiving end to reconstruct data in the correct order and detect missing or duplicate segments, ensuring data integrity without requiring complex real-time synchronization mechanisms.
Data Source
AI summary
Embodiments of the present invention provide a data transmission method and system, and a proxy device. The transmission method includes: establishing a TCP connection between a client and an Internet server, where a proxy device interacts with the client in a wireless manner, and the proxy device interacts with the Internet server in a wired manner; and obtaining, by the proxy device, a start serial number and a reply serial number in a corresponding direction and completing data forwarding between the client and the Internet server based on this without respectively establishing an independent TCP connection with the client or the Internet server, so that the quality of service of a wireless network is not affected.