Dynamic SMS Routing for Voice Call Handovers
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Solution Overview
Problem
In communication systems, when a client device registered with an LTE network temporarily switches to a legacy network for voice calls, SMS message delivery is delayed due to the SMS gateway's reliance on the LTE network as the primary route, leading to user-experience issues.
Innovation Solution
The system detects when a client device is being served by a voice call on a secondary access network and reconfigures to use that network as the primary route for SMS message routing, reverting back to the initial network once the voice call ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SMS gateway uses the LTE access network as the primary route for routing SMS messages to a WCD registered via LTE, then normal SMS delivery works when the WCD is on LTE, but SMS message delivery is delayed when the WCD switches to legacy network for voice calls
Solution Approach 1:
The patent implements dynamic routing by making the SMS gateway's primary route selection changeable based on the WCD's current network status. The system detects when a WCD registered via LTE is being served by a legacy network for voice calls, and automatically switches the primary routing path from LTE to legacy network, ensuring SMS messages are delivered through the network currently serving the WCD.
Solution Approach 2:
The system employs feedback mechanisms where the SMS gateway monitors the WCD's network registration and voice call status. When the gateway detects that a WCD is being served by a legacy network during a voice call (even while registered via LTE), it receives feedback about this status change and responds by switching the routing path to use the legacy network for SMS delivery.
2Device complexity
If the SMS gateway attempts to route SMS messages via the LTE network when the WCD is on legacy network, then the default routing configuration is maintained, but routing failures occur causing delays
Solution Approach 1:
The patent makes the routing configuration dynamic rather than static. The SMS gateway automatically adjusts the primary routing path based on real-time detection of the WCD's network status. When a WCD registered via LTE is detected to be served by a legacy network for voice calls, the gateway dynamically switches the primary route to the legacy network, maintaining simple configuration logic while achieving reliable routing.
Solution Approach 2:
The SMS gateway performs self-service by automatically detecting network status changes and adjusting its own routing configuration without external intervention. The gateway monitors voice call setup signaling to determine when WCDs are being served by legacy networks and autonomously switches routing paths accordingly.
Data Source
AI summary
A method and system to help control message routing in a scenario where a client device is registered with a media system via a first network and the media system is configured by default use the first network as a primary route for routing messages to the WCD. Per the disclosure, the media system will detect, while the client device is so registered via the first network, that a second network is serving the client device with a voice call, and the media system will responsively be reconfigured to use the second network as a primary route for routing of messages destined to the client device. Further, the media system may then subsequently detect that the voice call has ended, and the media system may responsively revert to being configured to use the first network as the primary route for routing of messages destined to the client device.