Path Switching System for Mobile Terminal Offloading
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Solution Overview
Problem
In the EPS (Evolved Packet System), the lack of coordination between MME and PDN-GW leads to congestion in signaling paths during UE offloading, resulting in packet delivery delays and jitter, especially when the UE has connections to both 3GPP and non-3GPP radio access networks, affecting voice and video quality in communication sessions.
Innovation Solution
A path switching system and method that includes a control unit managing connection changes for a mobile terminal, sending messages to the terminal about relay device changes, and determining if additional paths exist that can be managed, allowing for predetermined processing on these paths to optimize communication sessions when the UE is offloaded from one PDN-GW to another.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE is offloaded from the first PDN-GW to the second PDN-GW, then the packet delivery efficiency is improved, but the signaling path congestion occurs due to lack of coordination between MME and PDN-GW
Solution Approach 1:
The patent implements a feedback mechanism where the MME sends an indication message to the PDN-GW when switching the UE's data path from a first PDN-GW to a second PDN-GW. This feedback allows the PDN-GW to be aware of the path switch and coordinate accordingly, preventing signaling path congestion while maintaining efficient packet delivery.
Solution Approach 2:
The MME performs preliminary action by sending the path switch indication message to the PDN-GW before or during the data path switching process. This preliminary notification allows the PDN-GW to prepare for the switch and coordinate with the MME, avoiding signaling congestion that would occur without such advance notice.
2Reliability
If the UE maintains connections to both 3GPP and non-3GPP radio access networks, then the communication reliability is improved, but the coordination complexity between MME and PDN-GW increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the MME acts as a mediator that coordinates between the UE's multiple access networks and the PDN-GW. By sending standardized indication messages through the MME, the system simplifies the coordination complexity while maintaining reliable communication across both 3GPP and non-3GPP networks.
3Device complexity
If the additional path between mobile terminal and first relay device is not managed, then the system complexity is reduced, but the packet delivery delay and jitter increase
Solution Approach 1:
The patent segments the path management by distinguishing between the primary managed path (through the second PDN-GW) and the additional unmanaged path (through the first PDN-GW). This segmentation allows the system to maintain simple overall architecture while actively managing critical paths to reduce packet delivery delay and jitter for time-sensitive traffic.
Data Source
AI summary
A path switching system is provided, in which when UE has been offloaded from a first PDN-GW to a second PDN-GW, if there is an additional connection of the UE to the first PDN-GW, processing related to the additional connection can be performed on the UE side. The system includes: a control unit for sending a mobile terminal a message including information indicative of having switched relay devices, which relay a packet between the mobile terminal and a communication device, from a first relay device to a second relay device; and the mobile terminal for determining whether there is an added path other than part of a path from the mobile device before movement to the communication device and capable of being managed by the control unit, established between the mobile terminal and the first relay device, and when there is the added path, performing processing on the added path.