Centralized Routing in Hybrid Mobile Networks
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Solution Overview
Problem
Hybrid mobile networks face challenges in providing consistent user experiences due to the lack of centralized call routing, which affects authorization, fraud management, and feature support when a mobile device roams, as the home network is not typically inserted into the call path.
Innovation Solution
A two-stage dialing solution is implemented, where a mobile device uses a centralized routing service to route calls through the home network, anchoring media, signaling, and call context in the VoIP core network, enabling voice call continuity and enhanced features by monitoring connection conditions and handoff calls to optimal connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If local breakout routing is used in visited networks, then call setup speed is improved, but home network control and feature support are lost
Solution Approach 1:
The patent introduces a centralized routing service as an intermediary component that sits between the mobile device and the visited network. This service receives call setup requests, inserts the home network into the call path, and enables both fast local routing and full home network control. The intermediary resolves the contradiction by allowing local breakout speed while maintaining centralized home network management.
2Adaptability or versatility
If home network is inserted into call path, then centralized control and feature support are improved, but call routing complexity increases
Solution Approach 1:
The patent extracts the routing complexity from the mobile device and visited network by introducing a dedicated centralized routing service. This service handles all the complex home network insertion and call path management logic in one centralized location, simplifying the overall system architecture while maintaining centralized control capabilities.
3Adaptability or versatility
If roaming routing is used, then network adaptability is improved, but user experience consistency deteriorates
Solution Approach 1:
The centralized routing service provides universal home network control across all visited networks and access technologies. By maintaining a consistent call path insertion mechanism regardless of the visited network type, the service ensures uniform user experience and feature support across diverse network environments, achieving both adaptability and consistency.
Data Source
AI summary
A mobile device utilizes a two-stage dialing solution when roaming on a visited mobile operator (MO) network to implement centralized routing so that a home network portion of a hybrid network is inserted into the path of outbound calls. A remote centralized routing (CR) service interoperates with a CR client on the mobile device. When a call is initiated to a remote party, the CR client calls into an arbitrary roaming routing number that is terminated in the home network. Once the call is connected between the mobile device and home network, the CR client sends a dialing string that includes a destination number of the remote party. The CR service calls the destination number and then bridges the calls to the mobile device and remote party to establish an end-to-end call path between the local and far ends of the call that traverses the home network.