Local Breakout Authorization for IMS Roaming Services
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Solution Overview
Problem
Current communication systems face challenges in efficiently managing connectivity and mobility of network devices when roaming, leading to suboptimal use of available network resources and increased complexity in managing multiple packet data networks.
Innovation Solution
A mobile communication terminal with a registration module that initiates registration with IP multimedia subsystems (IMS) in a home network while roaming, using a first IP address for local connectivity and potentially switching to a second IP address for optimized resource utilization, with the IMS controlling session setups and resource allocation to determine the best PDN for service delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal always connects to the home network's PDN for IMS services while roaming, then service consistency is maintained, but network resource efficiency deteriorates due to suboptimal routing
Solution Approach 1:
The patent implements dynamic PDN selection by allowing the mobile terminal to switch between home network PDN and visited network PDN based on real-time conditions. The terminal determines whether to use local breakout to visited PDN or route through home network PDN, making the connection path adaptable rather than static, thereby optimizing network resource efficiency while maintaining service consistency.
Solution Approach 2:
The patent changes the routing parameter dynamically by introducing a determination mechanism that selects between two different PDN connection modes. The system alters the network path parameter based on whether local breakout is supported and whether visited PDN can provide equivalent services, thus resolving the contradiction between service consistency and resource efficiency.
2Loss of energy
If the system supports local breakout to visited PDN for IMS services, then network resource efficiency improves, but device complexity increases due to additional determination logic
Solution Approach 1:
The patent applies preliminary action by having the mobile terminal determine in advance whether the visited network supports local breakout for IMS services before actually establishing connections. This advance determination allows the terminal to prepare the appropriate routing strategy, reducing the complexity of real-time decision-making while improving network resource efficiency.
Solution Approach 2:
The patent introduces an intermediary determination mechanism that acts as a mediator between the mobile terminal and the network. This intermediary layer handles the complex logic of selecting between home PDN and visited PDN, shielding the terminal from direct complexity while enabling efficient resource utilization through intelligent routing decisions.
3Adaptability or versatility
If multiple PDN connections are managed simultaneously, then service versatility improves, but management complexity increases
Solution Approach 1:
The patent segments the PDN connection management into distinct scenarios: home network PDN connection, visited network PDN connection with local breakout, and fallback mechanisms. By dividing the complex management task into separate, well-defined segments, the system achieves service versatility across different roaming scenarios while reducing overall management complexity through structured handling of each case.
Data Source
AI summary
A mobile communication terminal includes a registration module that initiates a registration of the mobile communication terminal with Internet protocol (IP) multimedia subsystems (IMS) within a home network. The registration module initiates registration when the mobile communication terminal is roaming in a visited network. The mobile communication terminal also includes a session module that initiates a session set-up with the IMS to enable use of IMS resources. At least one of the registration module and the session module provide a first IP address to the IMS during at least one of the registration and the session set-up. The mobile communication terminal communicates with a first packet data network (PDN) that is local to the visited network using the first IP address in order to use at least one of the IMS resources.