SIPTO Offload at Assisting eNodeB for Bearer Traffic
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Solution Overview
Problem
Current wireless communication systems lack the ability to effectively implement Selected Internet Protocol Traffic Offload (SIPTO) for user equipment (UE) when multiple eNodeBs coordinate with each other, limiting the offloading of bearer traffic to assisting eNodeBs rather than the core network.
Innovation Solution
The described techniques enable SIPTO by determining the network address of a local gateway at an assisting eNodeB, establishing a direct path for SIPTO packet data network connections, and managing the transition of SIPTO connections between anchor and assisting eNodeBs to optimize network resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SIPTO is implemented only at anchor eNodeB, then core network resources are conserved, but user plane throughput is limited
Solution Approach 1:
The patent segments the SIPTO functionality by distinguishing between anchor eNodeB and assisting eNodeB roles. The anchor eNodeB maintains control plane functions while assisting eNodeBs handle user plane offloading. This segmentation allows throughput improvement through additional offloading paths without requiring full SIPTO implementation at all eNodeBs, thus managing complexity.
Solution Approach 2:
The patent introduces an intermediary mechanism where the anchor eNodeB acts as a coordinator between the core network and assisting eNodeBs. This intermediary manages the SIPTO connections, handles signaling, and coordinates traffic flow, enabling throughput improvement while centralizing complex management functions at the anchor eNodeB.
2Adaptability or versatility
If multiple eNodeBs are used for UE communication, then network coverage and capacity are improved, but SIPTO implementation becomes undeveloped and complex
Solution Approach 1:
The patent merges the SIPTO functionality across multiple eNodeBs by allowing assisting eNodeBs to participate in offloading while maintaining a unified management structure through the anchor eNodeB. This combining approach enables multi-eNodeB coordination for improved adaptability while preserving operational simplicity through centralized control.
Solution Approach 2:
Instead of requiring each eNodeB to independently implement full SIPTO functionality (which would be complex), the patent inverts the approach by having assisting eNodeBs provide simplified offloading capabilities while the anchor eNodeB handles the complex management and coordination functions.
3Loss of energy
If bearer traffic is offloaded to core network, then QoS is enforced, but network resource efficiency is reduced
Solution Approach 1:
The patent applies local quality by implementing SIPTO at assisting eNodeBs for specific user plane traffic while maintaining core network connectivity for control plane functions and QoS-critical traffic. This localized offloading reduces core network resource consumption for suitable traffic while preserving QoS enforcement through the anchor eNodeB's connection to the core network.
Data Source
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AI summary
Techniques are described for selected internet protocol traffic offload (SIPTO) support at an assisting eNodeB. A request to establish a bearer for a UE is received and it is determined whether the request is associated with a SIPTO packet data network (PDN) connection for the UE at a second eNodeB. The bearer may be established by communicating with the second eNodeB in response to the determination that the request is associated with the SIPTO PDN connection for the UE at the second eNodeB and a radio bearer corresponding to the SIPTO PDN connection may be established with the UE