SIPTO LIPA Data Forwarding During Handover
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Solution Overview
Problem
Current mobile communication systems face challenges in optimizing data forwarding during handover processes, particularly when supporting Selected IP Traffic Offload (SIPTO) and Local IP Access (LIPA) services, as they require resource optimization and efficient service connectivity while ensuring seamless handover without resource wastage.
Innovation Solution
A method for data forwarding is introduced, where the source system transmits SIPTO/LIPA indication information to the destination system, enabling an optimized data forwarding mechanism that bypasses unnecessary resource reservation by forwarding uplink data directly through the source system's user plane path, avoiding intermediate nodes and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional data forwarding mechanism is used during handover, then service connectivity is maintained, but resource wastage occurs due to unnecessary resource reservation at destination system
Solution Approach 1:
The patent applies local quality by differentiating data forwarding handling between source system and destination system. The source system continues forwarding uplink data through its user plane path, while the destination system skips resource reservation for such data. This localized differentiation resolves the contradiction by optimizing resource usage at the destination without affecting connectivity maintenance at the source.
Solution Approach 2:
The patent segments the data forwarding process into two distinct paths: (1) source system's user plane path for uplink data, and (2) destination system's resource allocation path for downlink data. This segmentation allows independent optimization of each path, enabling resource wastage reduction in the destination system while preserving service connectivity through the source system path.
2Productivity
If user plane node is selected closer to access network for SIPTO/LIPA, then service quality and cost efficiency improve, but handover complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the source system to identify and mark uplink data that should be forwarded through its user plane path. The SIPTO/LIPA indication information is prepared in advance, allowing the destination system to immediately recognize and handle such data appropriately during handover, thereby reducing handover complexity while maintaining service quality.
Solution Approach 2:
The patent introduces SIPTO/LIPA indication information as an intermediary mechanism that carries forwarding path identification between source and destination systems. This intermediary enables automated recognition and handling of special data flows during handover, reducing manual configuration complexity while preserving the benefits of user plane node selection closer to access network.
3Productivity
If optimized data forwarding is implemented, then resource allocation efficiency improves, but system compatibility challenges arise
Solution Approach 1:
The patent applies universality by designing the optimized data forwarding mechanism to work within the existing E-UTRAN and core network architecture. The source system's user plane path, which already exists for normal data forwarding, is repurposed to also handle SIPTO/LIPA data forwarding during handover. This multi-functional use of existing infrastructure improves resource allocation efficiency without requiring new system components, thereby maintaining system compatibility.
Data Source
AI summary
The present invention provides a method for data forwarding. The method includes: transmitting, by a source system, Selected IP Traffic Offload (SIPTO)/Local Internet Protocol Access (LIPA) indication information to a destination system, the SIPTO/LIPA indication information indicating that the source system adopts an optimized user plane network structure; performing, by the destination system, an optimized data forwarding mechanism after receiving the SIPTO/LIPA indication information. According to the present invention, it can be ensured that a system sets up an optimized data forwarding mechanism during a handover process of a terminal.