Global Local SIM Routing for Roaming Cost Reduction
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Solution Overview
Problem
Current mobile network systems incur high costs for international calls due to roaming agreements, and users face identity changes when crossing national boundaries, as they need multiple SIM cards or complex systems to manage different network operators.
Innovation Solution
A method and system that assign international telephone numbers and SIM cards to subscribers, allowing bulk wireless access in multiple countries, with a centralized mobile communication switching center routing calls and signals, eliminating the need for multiple SIM cards and maintaining consistent user identity across borders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If users use multiple SIM cards to avoid roaming charges, then communication cost is reduced, but device complexity and user convenience deteriorate
Solution Approach 1:
The patent applies universality by enabling a single SIM card to function across multiple countries through the assignment of local telephone numbers in each country. The system allows one SIM card to be recognized by multiple national networks, making it universally functional without requiring physical multiplication of SIM cards.
Solution Approach 2:
The patent uses copying by assigning the same SIM card identifier to multiple telephone numbers in different countries. Instead of creating multiple physical SIM cards, the system creates virtual copies of the subscriber identity across different national numberings, allowing the single SIM to access multiple networks.
2Loss of energy
If users switch SIM cards when crossing borders, then roaming charges are avoided, but user identity changes and communication continuity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-assigning local telephone numbers in multiple countries to each subscriber before they travel. The home location register is pre-configured with the subscriber's presence in multiple countries, so when the subscriber crosses borders, the system already has the necessary routing information to maintain their identity and route calls correctly without requiring real-time SIM changes.
3Reliability
If MNOs own and control network infrastructure in each country, then service quality is improved, but system complexity and market accessibility deteriorate
Solution Approach 1:
The patent introduces an intermediary layer - the centralized home location register - that mediates between the subscriber's home network and multiple foreign networks. This intermediary handles the complexity of international routing and number translation, allowing local MNOs to maintain their infrastructure while enabling global access through a unified system that manages the relationships between different networks.
Data Source
AI summary
A communication system includes a telephone network having a mobile communication switching center, a plurality of subscriber terminals, and routing logic. The system further including a plurality of wireless access points located in different countries, wherein each of the subscriber terminals is identified by a telephone number, the telephone numbers being selected from a block of telephone numbers in international format, but which have not been allocated to any particular country, the wireless access points being configured to pass all signals from any of the subscribers' terminals having telephone numbers within the number block to the mobile communication switching center which contains MNO core infrastructure. A method is also provided. The system and method create a network in which SIM-enabled mobile phone can be used worldwide as if on a local network, and without roaming charges.