Inbound Roamer Call Control via Service Node
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Solution Overview
Problem
Current methods for implementing call control services for inbound roamers are resource-intensive, switch-dependent, and lack efficient IMSI and calling party number handling, making them costly and limited in functionality.
Innovation Solution
The implementation of a system using a control node and service node architecture, where the service node sends Terminating Customized Applications for Mobile network Enhanced Logic Subscription Information (T-CSI) to a switching center, allowing the control node to manage call control services independently of the switch, utilizing a CAMEL protocol for IMSI compliance and resource optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ISUP signaling is used to implement call control services for inbound roamers, then circuit resources are heavily utilized and switches cannot provide finer control of dialing digits analysis, but the service node can route calls through service nodes optimally applying various call service logics
Solution Approach 1:
The patent introduces a service node as an intermediary component between the switch and the inbound roamer call handling. The service node receives ISUP signaling from the switch, extracts the called number, queries the HLR for the IMSI, and applies call control services independently. This intermediary architecture allows the switch to offload complex call control logic while maintaining ISUP signaling compatibility, thereby reducing circuit resource utilization at the switch and enabling finer control of dialing digits analysis through the service node.
2Use of energy by moving object
If MAP SRI signaling is used to implement call control services, then ISUP signaling resource utilization is reduced, but the calling party number and IMSI of the inbound roamer are not available for billing and service control
Solution Approach 1:
The patent merges MAP SRI signaling with ISUP signaling to create a hybrid approach. The service node first receives MAP SRI signaling to obtain routing information and reduce ISUP resource utilization. Then, it extracts the called number, queries the HLR using MAP signaling to obtain the IMSI, and combines this information with ISUP signaling to access calling party number. This merged approach retains the resource efficiency of MAP SRI while recovering the missing calling party information through ISUP signaling integration, enabling both billing and service control.
3Use of energy by moving object
If Intelligent Network (IN) signaling is used to implement call control services, then circuit resources are not heavily utilized and billing can be generated, but the approach is switch dependent and requires license of switch dependent IN specification
Solution Approach 1:
The patent implements a universal service node architecture that can interface with multiple switch types through standardized signaling protocols (ISUP and MAP). The service node performs multiple functions including call routing control, IMSI extraction, HLR querying, and billing information generation, making it adaptable to different switch vendors and network configurations. This multi-functional design eliminates switch dependency while maintaining resource efficiency and billing capability, as the service node operates independently from specific switch implementations.
Data Source
AI summary
A system for implementing call control services for an inbound roamer is provided. The system includes a control node to implement the call control services in response to an initiation request. The system further includes a service node to send a terminating customized applications for mobile network enhanced logic subscription information (T-CSI) for a called number in response to a routing request for the called number. The T-CSI contains an address pointing to the control node. The system further includes a switching center to send the routing request for the called number. The called number is present in a call received from the inbound roamer.