QoS Flow Handover Status Synchronization Across Network Devices
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Solution Overview
Problem
In next-generation communications systems, the synchronization of notification control statuses between access network devices and core network devices is often out-of-sync during handovers of QoS flows, leading to incorrect policy decisions by the core network.
Innovation Solution
A communication method where access network devices exchange information to synchronize notification control statuses with the core network, ensuring timely updates and preventing incorrect policy decisions by maintaining synchronized notification control statuses post-handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a QoS flow is handed over from a source access network device to a target access network device, then the QoS flow can be served by a new DRB with potentially better quality, but the notification control status recorded by the core network device becomes out-of-sync with the actual status
Solution Approach 1:
The patent implements a feedback mechanism where the target access network device sends notification control status information to the core network device after taking over the QoS flow. This feedback loop ensures that the core network device updates its recorded status to match the actual status, resolving the synchronization issue caused by handover.
Solution Approach 2:
The patent applies preliminary action by having the source access network device send notification control status information to the target access network device before the handover is completed. This allows the target device to be prepared with the correct status information, preventing synchronization issues from occurring in the first place.
2Stability of the object's composition
If the core network device continues to use the notification control status from before handover, then it maintains consistency with historical records, but it makes incorrect policy decisions based on outdated information
Solution Approach 1:
The feedback mechanism ensures that the core network device receives updated notification control status information from the target access network device after handover. This allows the core network device to maintain consistency with current actual status rather than relying on outdated historical records, thereby improving policy decision accuracy.
Solution Approach 2:
The patent changes the parameter of notification control status from a static historical record to a dynamic updated value. By having the core network device update its recorded status based on information from the target access network device, the system transitions from using outdated parameters to current accurate parameters for policy decisions.
Data Source
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AI summary
A communication method and a communications apparatus are provided. In the method, in a process in which at least one quality of service flow is handed over from a first access network device to a second access network device, the first access network device sends first information to the second access network device, where the first information is used to indicate that the first access network device has notified a core network device that a quality of service requirement of the at least one quality of service flow cannot be met; and after receiving the first information sent by the first access network device, the second access network device may send second information to the core network device, where the second information is used to notify the core network device that a quality of service requirement of a first quality of service flow in the at least one quality of service flow can be met, and the first quality of service flow is a quality of service flow that has been handed over from the first access network device to the second access network device. In this way, notification control statuses that are of the quality of service flow and that are recorded on a core network side and on an access network side after a handover of the quality of service flow can be synchronized with each other as much as possible.