Base Station Handover With Selective QoS Flow Transfer
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Solution Overview
Problem
The challenge of efficiently managing and scheduling data transmission in a quality of service (QoS) flow-based framework during handover processes in 5G communications systems remains unresolved.
Innovation Solution
A communication method involving a source and target base station that includes sending and receiving handover request and response messages with QoS flow information, enabling QoS flow granularity handover processes to improve management and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional handover procedures are used without QoS flow granularity, then the handover process is simpler, but management efficiency and communication efficiency deteriorate
Solution Approach 1:
The patent segments the handover process into QoS flow granularity, where individual QoS flows are evaluated, accepted, or rejected separately during handover. The handover request message includes information about multiple QoS flows, and the target base station processes each flow independently, allowing fine-grained control over which services are maintained during handover while simplifying overall management through structured processing.
2Reliability
If all QoS flows are transferred during handover, then communication continuity is maintained, but resource waste occurs when some flows are rejected
Solution Approach 1:
The patent applies partial action by transferring only the subset of QoS flows that are accepted by the target base station, rather than transferring all flows. The source base station receives admission control results for individual QoS flows and selectively forwards data only for accepted flows, avoiding the waste of transferring data for rejected flows while maintaining continuity for accepted services.
3Adaptability or versatility
If QoS flow information is included in handover messages, then finer-grained QoS management is achieved, but message size and processing complexity increase
Solution Approach 1:
The patent segments QoS flow information into structured elements within handover messages. Each QoS flow is represented with specific information elements that can be independently processed. The target base station evaluates each flow's admission control separately based on these segmented information elements, enabling fine-grained QoS management while maintaining organized, manageable message structures.
Data Source
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AI summary
This application provides a communication method, a base station, a terminal device, and a system, to improve communication efficiency in a base station handover process. The method includes: sending, by a source base station, a handover request message to a target base station, where the handover request message is used to instruct to hand over a first session of a terminal device from the source base station to the target base station, the handover request message includes first information, the first information includes information about at least one quality of service QoS flow in the first session, and the first session is a session corresponding to the terminal device; and receiving, by the source base station, a handover request response message from the target base station, where the handover request response message includes second information, the second information is used to indicate that the target base station accepts a first QoS flow in the first session, and the at least one QoS flow includes the first QoS flow.