PGW Re-selection for UE Mobility in LIPA/SIPTO Networks
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Solution Overview
Problem
In the EPC network, when a UE moves over long distances, the initially selected PGW may become inefficient for connectivity, leading to transmission delays and inefficient network resource consumption due to its physical or network-topological distance from the UE's new location.
Innovation Solution
A communication system and method that re-selects an optimal PGW based on the UE's movement, using the LIPA/SIPTO architecture, where the MME sends signals for re-attachment and re-selection of the gateway apparatus, optimizing the bearer path between the UE and the PGW.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the PGW is fixedly selected at the time of UE attachment and used as anchor until detachment, then connection stability is improved and IP information remains unchanged, but network efficiency deteriorates when UE moves over long distances due to increased physical or network-topological distance
Solution Approach 1:
The patent applies dynamics by enabling the PGW selection to change from static to dynamic. The system determines whether the UE has moved a predetermined distance from the initial attachment location, and based on this determination, either maintains the original PGW or re-selects a new PGW closer to the UE's current location. This dynamic adjustment resolves the contradiction between connection stability and network efficiency.
2Productivity
If the PGW is re-selected when UE moves over long distances, then network efficiency is improved by reducing transmission delay, but connection stability deteriorates due to bearer disconnection and re-establishment
Solution Approach 1:
The system dynamically evaluates the UE's movement distance and selectively triggers PGW re-selection only when necessary. By determining whether the UE has moved a predetermined distance, the system balances the need for network efficiency with connection stability, avoiding unnecessary re-connections while enabling re-selection when it becomes beneficial.
Solution Approach 2:
The patent changes the parameter of PGW selection criteria based on UE movement conditions. When the UE moves within a certain distance threshold, the original PGW is maintained; when the threshold is exceeded, the system changes to select a new PGW based on proximity to the UE's current location. This parameter-based decision-making resolves the contradiction between efficiency improvement and connection stability.
3Ease of manufacture
If a PGW close to the initial attachment location is selected, then connection establishment is simplified, but transmission delay increases when UE moves to far-away locations due to inefficient data routing
Solution Approach 1:
The system dynamically adjusts the PGW selection based on UE movement. Initially, a PGW close to the attachment location is selected for simple connection establishment. When the UE moves beyond a predetermined distance, the system dynamically re-selects a PGW closer to the UE's current location, thereby reducing transmission delay while maintaining ease of connection establishment through automated determination.
Data Source
AI summary
A communication method in LIPA/SIPTO architecture is provided which, when a user equipment (UE) is to connect from a serving area to an external network, allows re-selection of an optimal gateway. The communication method allows selecting a gateway apparatus physically or topologically close to a site, where the user equipment is attached.