TCP Parameter Transfer During UE Handover
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Solution Overview
Problem
In wireless networks, the TCP protocol's efficiency is reduced due to assumptions not applicable, leading to service discontinuity during UE handovers as parameters controlling the TCP connection are lost, disrupting service continuity.
Innovation Solution
A data transmission method where a network device sends essential TCP parameters like CWND, Ssthresh, RWND, and TCP segment length to a target network device during UE handovers to maintain the TCP connection, ensuring service continuity by using a TCP proxy mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a TCP proxy mechanism is used with network devices to optimize TCP working efficiency in wireless networks, then data transmission efficiency is improved, but service continuity cannot be ensured during UE handovers because TCP control parameters are lost in source network devices
Solution Approach 1:
The source network device performs preliminary actions by storing TCP control parameters (CWND, Ssthresh, RWND, etc.) before handover occurs, and proactively transfers these parameters to the target network device when handover conditions are met, ensuring the target device is prepared to maintain TCP connection continuity without waiting for parameter loss to occur
Solution Approach 2:
The patent introduces an intermediary mechanism where the source network device acts as a temporary holder and transmitter of TCP control parameters during the handover process. The source device receives parameters from the UE, maintains them during the handover transition period, and transfers them to the target network device, ensuring continuous TCP connection management throughout the handover process
2Device complexity
If TCP protocol assumptions for wired networks are applied to wireless networks, then protocol simplicity is maintained, but working efficiency is reduced due to mismatched assumptions about packet loss causes
Solution Approach 1:
The patent applies local quality by implementing TCP proxy functionality specifically at the network device level in the wireless access network, rather than modifying the TCP protocol itself. The network device locally adapts TCP parameters and manages connections according to wireless network characteristics (small bandwidth, large delay, mobility) while the core TCP protocol remains unchanged, providing wireless-optimized behavior only where needed
Solution Approach 2:
The network device dynamically changes TCP parameters (CWND, Ssthresh, RWND, TCP segment length) based on wireless network conditions and handover states. These parameter adjustments optimize TCP performance for wireless characteristics without requiring fundamental protocol changes, allowing efficient adaptation to varying wireless conditions while maintaining protocol compatibility
Data Source
AI summary
When a condition of handing over user equipment from a cell in which a first network device is located to a cell in which a second network device is located is met, the first network device sends first information to the second network device, where the first information includes at least one of a CWND, a slow start threshold, a window scale factor, a RWND, and a TCP segment length; the slow start threshold is a value of demarcation between a slow start state and a congestion state; the window scale factor is a window scale factor carried in a SYN packet when a TCP connection is set up; the RWND is a maximum data volume that can be received by the user equipment; and the TCP segment length is a length of a maximum TCP segment that can be sent by the first network device.