Wireless Bearer Re-establishment for Low Latency Handover
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency, particularly in next-generation systems requiring ultra-low latency for services like pain, auditory, and tactile sensations, due to limitations in transmission control protocols like TCP, which increase latency when errors occur.
Innovation Solution
A method and device for maintaining service connections in wireless communication systems by re-establishing bearers between base stations and servers during handovers, allowing seamless service continuity through the access layer without relying on transmission layer protocols, enabling efficient data transmission and minimizing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCP window scheme is used for flow control, then data transmission reliability is improved, but transmission latency increases when errors occur
Solution Approach 1:
The patent segments the data transmission path into multiple parallel bearers (first bearer and second bearer) between the base station and terminal. By dividing the transmission path, data can be sent through multiple independent channels simultaneously, reducing the impact of errors on overall transmission latency while maintaining reliability through redundancy.
Solution Approach 2:
The patent performs preliminary actions by pre-establishing multiple bearers before data transmission begins. When handover occurs or errors are detected, the system can immediately switch to or utilize the pre-established bearers without waiting for re-establishment, thereby reducing transmission latency while maintaining reliability.
2Reliability
If service connection is re-established during handover, then service continuity is improved, but transmission latency increases
Solution Approach 1:
The patent performs preliminary actions by maintaining the first bearer connection during handover before the terminal actually switches to the target base station. The source base station continues to forward data through the first bearer to the terminal during the handover process, so when handover completes, the service connection is already established, reducing handover latency while ensuring service continuity.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining data transmission through the first bearer during the handover transition. The source base station continues to send data via the first bearer to the terminal even as the terminal moves to the target base station, ensuring uninterrupted service delivery and minimizing handover latency.
Data Source
AI summary
The disclosure relates to a 5G or a pre-5G communication system which will be provided to support a higher data transmission rate after a 4G communication system such as LTE. The present invention provides a method for providing a service by a target base station in a wireless communication system, the method comprising: when the target base station supports an on-going service, which is the same service as a service currently received by a terminal from a source base station, transmitting, to a base station server, a service registration update request message requesting a re-establishment of a first bearer provided between the source base station and the base station server connected to the source base station; receiving, from the base station server, a service registration update response message indicating that the re-establishment of the first bearer is accepted; and receiving data related to a service, provided from the base station server, through the first bearer re-established between the target base station and the base station server, and transmitting the data to the terminal.