Seamless Server Switching via Sequence Number Coordination
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Solution Overview
Problem
Current data transmission methods in wireless communications face challenges in ensuring service continuity and user experience when user equipment (UE) moves from one server area to another, as existing solutions require disconnecting and reconnecting, which can cause poor service continuity and affect user experience.
Innovation Solution
A data transmission method involving a first device sending messages to a second device to stop data transmission, exchanging sequence numbers, and establishing a new connection with a second server, ensuring seamless data migration and continuity by using TCP or MPTCP connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE releases the connection between the UE and the source server and re-establishes a connection between the UE and the target server, then the data transmission can be switched to the target server, but the service continuity deteriorates and user experience is affected
Solution Approach 1:
The patent applies preliminary action by establishing a connection to the target server before the UE actually needs to switch servers. The network side device proactively creates the target server connection in advance, so when server switching is needed, the connection is already ready and can be activated immediately without requiring UE to release and re-establish connections, thus maintaining service continuity
Solution Approach 2:
The patent introduces a network side device as an intermediary between the UE and the servers. This intermediary manages the server switching process by coordinating the source server and target server connections, enabling seamless data transmission switch without requiring the UE to perform connection release and re-establishment operations
2Reliability
If the UE continues to transmit data to the source server after moving to a new area, then the connection is maintained, but the transmission delay increases and service quality deteriorates
Solution Approach 1:
The patent applies dynamics by making the data transmission path adjustable and adaptable. The network side device dynamically selects the optimal server based on real-time UE location and network conditions, switching the data transmission path from source server to target server to minimize transmission delay while maintaining connection stability through proper sequence number coordination
3Adaptability or versatility
If the connection between UE and source server is released and re-established with target server, then the data transmission path is updated, but the data sequence integrity may be compromised and service continuity is affected
Solution Approach 1:
The patent applies feedback by using sequence numbers as a feedback mechanism to track data transmission status. The network side device uses sequence numbers from the source server connection and properly coordinates them with the target server connection, ensuring that data sequences remain intact during the switching process and preventing data loss or duplication
Data Source
AI summary
This application provides a data transmission method and communications devices. In some implementations, a terminal device receives, from a first server, first indication information indicating a sequence number of data that is of an application and that has been received by the first server from the terminal device. After a connection between the terminal device and a second server is established, the terminal device transmits data of the application through the connection between the terminal device and the second server according to the first indication information.