5G to EPS Handover Data Forwarding Consistency
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Solution Overview
Problem
The existing communication systems face challenges in seamless handover between 5G and EPS networks due to inconsistent decisions on data forwarding modes, leading to potential delays and inefficiencies in data transmission.
Innovation Solution
A method is introduced where the 5G system and EPS nodes share first indication information about direct or indirect data forwarding capabilities, allowing consistent decision-making on data forwarding paths through the use of new or existing information elements in handover requests and PDU session establishment requests, ensuring that data is forwarded appropriately between nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data forwarding decisions are made independently by 5G and EPS nodes, then each node can optimize its own data transmission, but inconsistent decisions lead to handover delays and transmission inefficiencies
Solution Approach 1:
The patent segments the data forwarding decision process into distinct capability indication components (first indication information from source node, second indication information from target node) that are exchanged through standardized signaling messages. This segmentation allows each node to independently assess and communicate its capabilities while ensuring consistent joint decision-making, resolving the contradiction between independent optimization and coordinated efficiency.
Solution Approach 2:
The patent implements a feedback mechanism where capability indication information is exchanged between 5G and EPS nodes during handover preparation. The source node provides first indication information about its data forwarding capabilities, and the target node provides second indication information, creating a feedback loop that enables both nodes to make informed, consistent decisions about data forwarding mode, thereby eliminating handover delays caused by inconsistent decisions.
2Speed
If direct data forwarding is used between source and target nodes, then transmission speed increases, but this requires both nodes to support direct forwarding capability
Solution Approach 1:
The patent introduces dynamic adaptability by making the data forwarding mode selectable based on real-time capability assessment. The system dynamically chooses between direct data forwarding (when both nodes support it, as indicated by capability information) and indirect data forwarding through core network (when capability mismatch exists). This dynamic adaptation resolves the contradiction between achieving high transmission speed and maintaining compatibility across different node configurations.
Solution Approach 2:
The patent changes the operational parameter of data forwarding mode (direct vs. indirect) based on the capability indication information exchanged between nodes. When the first and second indication information both indicate support for direct forwarding, the system parameters are set to enable direct data path; otherwise, the parameters switch to indirect forwarding through core network, ensuring both speed optimization and compatibility.
3Adaptability or versatility
If indirect data forwarding through core network is used, then compatibility between different node capabilities is maintained, but transmission efficiency decreases
Solution Approach 1:
The system dynamically adjusts the data forwarding path based on capability assessment. Indirect forwarding through core network is used only when necessary (when capability indication shows mismatch), while direct forwarding is preferred when both nodes support it. This dynamic approach maintains compatibility across different node configurations while minimizing the efficiency loss associated with indirect forwarding.
Solution Approach 2:
The core network acts as an intermediary for indirect data forwarding, providing a fallback path that ensures compatibility when direct forwarding is not possible. The capability indication mechanism determines when this intermediary path should be used, ensuring that compatibility is maintained only when necessary, thereby minimizing the impact on transmission efficiency.
Data Source
AI summary
Embodiments of the present application relate to the field of communication and provide a method, a network device, and an apparatus for communication system handover, and a medium, for handover of the communication system of a terminal. The method includes: includes an AMF sends a handover request carrying first indication information to an NG-RAN node corresponding to an identifier of a target NG-RAN node; and the NG-RAN node determines the address of data forwarding according to the first indication information.