IP-SM-GW SMS Routing via Access Network Type Detection
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Solution Overview
Problem
Current SMS management methods in 4G/3G/2G and WiFi networks are inefficient, particularly when terminals switch between network types, leading to suboptimal resource usage and errors in SMS routing, especially when WiFi connectivity is lost and the terminal switches to 2G/3G or 4G networks.
Innovation Solution
An SMS management method that uses a gateway to analyze the access network type from Third Party Registration frames and sends configuration messages to the HLR to route SMS through the IP-SM-GW only when the terminal is connected via WiFi or 4G, optimizing network resource usage by switching between SMSoSGs and SMSoIP modes based on network access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gateway systematically sends Third Party Registration notifications to the HLR for all terminals registered in the IMS core network, then the HLR can route SMS through the IP-SM-GW, but network resources are wasted when terminals are connected via 2G/3G cellular networks where SMS should be routed through V-MSC instead
Solution Approach 1:
The gateway analyzes the access network type (WiFi vs. cellular) for each terminal and sends HLR configuration messages selectively based on the local network conditions. This local differentiation ensures SMS are routed through IP-SM-GW only when appropriate (WiFi/4G), while avoiding unnecessary routing through cellular networks (2G/3G), thus optimizing both reliability and resource efficiency
Solution Approach 2:
The gateway changes the routing parameter (SMS path) based on the detected access network type. When the terminal is connected via WiFi or 4G, the gateway configures the HLR to route SMS through the IP-SM-GW. When connected via 2G/3G, the gateway suppresses the configuration message, allowing SMS to be routed through the traditional V-MSC path, thus adapting the routing behavior to network conditions
2Loss of energy
If the gateway analyzes access network type from Third Party Registration frames and selectively sends configuration messages to HLR, then network resource usage is optimized, but the device complexity increases due to additional analysis and decision logic
Solution Approach 1:
The gateway utilizes the existing Third Party Registration frame information (which already contains access network type indicators) to make routing decisions. By self-analyzing the registration data without requiring additional signaling or external assistance, the gateway achieves selective SMS routing with minimal added complexity, leveraging information already available in the registration process
Data Source
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Figure 1B
Figure 2A~2B
AI summary
The invention relates to a method for managing SMS text messages that is implemented by a gateway (IP-SM-GW) placed across the flow between an S-CSCF entity and an HLR entity in a telecommunications network. Said method comprises: - a step of receiving a Third Party Registration frame comprising the identifier of a terminal (UE); - a step of sending a configuration message to said HLR entity, said configuration causing the SMS text messages intended for said terminal to transit via said gateway (IP-SM-GW) or not. This method is remarkable in that it comprises: - a step of obtaining, from said frame, information (PANI) representative of the type of access network to which said terminal is connected; and in that - the sending and content of said configuration message are determined according to said type of access network.