PDN Connection Switching for Mobile Gateway Optimization
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Solution Overview
Problem
Current mobile communication systems lack a seamless method to switch a previously established PDN connection to a new, more optimal gateway, leading to suboptimal communication paths due to user equipment (UE) movement.
Innovation Solution
A terminal device and Mobility Management Entity (MME) configuration that enables the UE to establish a new PDN connection with a more optimal gateway by transmitting specific messages and requests, such as tracking area update and handover command messages, to switch from an initial PDN connection to a second PDN connection while maintaining communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains the originally established PDN connection after movement, then communication continuity is preserved, but the communication path becomes suboptimal and offload efficiency decreases
Solution Approach 1:
The system dynamically switches the PDN connection from the original gateway to a new gateway based on real-time UE location information. The MME determines whether to switch connections by comparing the UE's current location with the locations of available gateways, and the UE accordingly switches its PDN connection to maintain optimal offload efficiency while ensuring communication continuity.
2Productivity
If the UE switches to a new PDN connection with a closer gateway, then offload efficiency is improved, but communication discontinuity and packet loss may occur during switching
Solution Approach 1:
The MME performs preliminary determination of whether to switch the PDN connection before the actual switching occurs. The MME evaluates the UE's location information and gateway distribution in advance, and only initiates the switching process when the determination result indicates that switching will improve offload efficiency. This preliminary action prevents unnecessary switching that could cause communication discontinuity.
Solution Approach 2:
The system uses UE location information as feedback to continuously evaluate whether the current PDN connection is optimal. The MME receives location information from the UE, compares it with gateway locations, and determines whether switching would improve performance. This feedback mechanism ensures that switching decisions are based on current conditions, minimizing packet loss and maintaining communication continuity.
3Productivity
If the system implements PDN connection switching functionality, then optimal communication paths are achieved, but system complexity increases
Solution Approach 1:
The UE autonomously provides its own location information to the MME and autonomously switches its PDN connection based on the MME's determination result. The UE does not require complex external control mechanisms to trigger switching; instead, it self-services by monitoring its own location and executing switching when conditions are met. This reduces the overall system complexity while achieving optimal communication paths.
Data Source
AI summary
A user equipment (UE) transmits a packet data network (PDN) connectivity request message to a mobility management entity (MME), receives a PDN connectivity accept message, and establishes a PDN connection with a second local gateway (LGW) in accordance with the PDN connectivity accept message. Thus, it is possible to provide a communication system and the like for a purpose of implementing the optimal communication control for enabling the UE to continue communication by switching a previously established PDN connection to a new PDN connection using a more optimal gateway.