IP Stream Shunting During 3GPP Access Switching
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Solution Overview
Problem
During 3GPP inter-RAT handover, limited resources in the target access system can lead to loss of bearers and degradation of Quality of Service (QoS) for IP flows, causing service interruptions and poor user experience, as existing technologies do not effectively manage IP flow mobility and QoS guarantees.
Innovation Solution
A method and device that determine which IP flows to move to a Wireless Local Area Network (WLAN) during the 3GPP inter-RAT handover, allowing for concurrent execution of the handover and IP flow transfer, thereby improving IP flow mobility efficiency and ensuring uninterrupted service by reallocating bearers with unsuccessful resource allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IP flows are moved to WLAN access during 3GPP inter-RAT handover, then QoS guarantee and service continuity are improved, but device complexity and control difficulty increase
Solution Approach 1:
The patent applies preliminary action by determining which IP flows to move to WLAN access before the 3GPP inter-RAT handover is executed. The source access device identifies candidate IP flows based on QoS requirements and resource allocation status, and initiates the flow movement procedure in advance. This ensures that when handover occurs, the IP flows are already redirected to WLAN access, guaranteeing service continuity without requiring complex real-time decisions during the handover execution phase.
2Ease of operation
If IP flows are moved after handover completion, then control simplicity is maintained, but service interruption and QoS degradation occur
Solution Approach 1:
The patent resolves this contradiction by performing the IP flow movement determination and initiation before handover completion. The source access device identifies IP flows requiring movement and starts the redirection process while the handover is still in progress, ensuring both service continuity and manageable control complexity through advance preparation rather than post-handover action.
3Reliability
If all IP flows are moved to WLAN access, then QoS guarantee is improved, but network resource waste and loss of substance increase
Solution Approach 1:
The patent applies local quality by selectively moving only those IP flows that require QoS guarantee to WLAN access, rather than moving all IP flows uniformly. The source access device evaluates each IP flow's QoS requirements, service type, and resource allocation status individually, and redirects only the necessary flows to WLAN access. This selective approach ensures QoS guarantee for critical services while avoiding unnecessary WLAN resource consumption for flows that can be served by the target 3GPP access system.
Data Source
AI summary
The present application relates to the technology of communications. Disclosed are a method and device for shunting IP streams during 3GPP access switching; after having received a command for 3GPP access switching transmitted by a source 3GPP access device, a user equipment (UE) determines the IP streams to be transferred, and then performs 3GPP access switching and IP stream transferring at the same time, thus improving IP stream transferring efficiency. In addition, the IP streams to be transferred contain an IP stream capable of being transmitted via WLAN access after a target 3GPP access device fails to allocate resources to a bearers for transmitting the IP stream, thereby avoiding service interruption due to bearer loss, and thus improving the QoS ensurance for the service.