Level-1 Number Routing Using CTAS and SDCA Mapping
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Solution Overview
Problem
Current call routing systems for Level-1 numbers in telecom networks face inefficiencies when users roam, requiring significant resource usage and delays due to the need to maintain extensive lists of cell-IDs across India, leading to processing overheads and delayed service access.
Innovation Solution
A centralized database and Converged Telephony Application Server (CTAS) system that maintains a mapping table between E-UTRAN Cell Identifiers and Short Distance Charging Areas, enabling pre-formed communication strategies for Level-1 number routing, reducing the need for individual service contacts and optimizing database queries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the S-CSCF maintains all PAN India cell-ID lists for routing L1 numbers, then routing coverage is improved, but processing time and resource consumption increase significantly
Solution Approach 1:
The patent segments the routing information into two parts: (1) a maintained mapping between L1 numbers and their target SDCA circles, and (2) real-time user location information obtained from the serving network. This segmentation eliminates the need to maintain complete PAN India cell-ID lists while preserving routing coverage through dynamic location-based lookup.
Solution Approach 2:
The system performs preliminary setup by pre-configuring the mapping between L1 numbers and their destination SDCA circles in the database. During actual call routing, this pre-configured mapping enables rapid lookup without requiring real-time processing of extensive cell-ID lists, thus reducing processing time while maintaining routing accuracy.
2Measurement precision
If the S-CSCF maintains all PAN India cell-ID lists for routing L1 numbers, then routing accuracy is improved, but storage requirements and operational overhead increase
Solution Approach 1:
The patent extracts only the essential routing information (L1 number to SDCA circle mapping) from the complete PAN India cell-ID lists and stores it in the database. The detailed cell-ID to circle mapping is obtained dynamically from the serving network based on the user's current location, significantly reducing storage requirements while maintaining routing accuracy.
Solution Approach 2:
The system introduces an intermediary mechanism where the serving network (eNodeB) provides the user's current circle information based on their cell-ID. This intermediary supplies the missing location context without requiring the S-CSCF to store extensive cell-ID lists, thus reducing storage while preserving routing precision.
3Device complexity
If calls are routed through the home network for roaming users, then call establishment is simplified, but routing delays occur for location-based L1 services
Solution Approach 1:
The system performs preliminary preparation by pre-configuring the mapping between L1 numbers and their destination SDCA circles. When a roaming user dials an L1 number, the CTAS quickly retrieves the destination circle from this pre-configured mapping and the user's current location, enabling fast routing decisions without complex real-time database searches through the home network.
Solution Approach 2:
The CTAS acts as an intermediary that receives the call setup request, determines the user's current location through the serving network, and directly routes the call to the appropriate destination circle. This intermediary approach simplifies the routing process and reduces delays compared to routing through the home network while maintaining location accuracy for L1 services.
Data Source
AI summary
The present disclosure relates to a system (100) and method to facilitate accurate routing of level one (L1) numbers dialed by a user irrespective of the location of the user. The system may include a converge telephony application server (CTAS) (102), associated with a predefined circle, a centralized database accessible by the at least one CTAS (102), a centralized data layer (CDL) server (104) maintaining a mapping table comprising L1 routing information between an ECI and SDCA of the predefined circle. The CTAS may (102) receive one or more predefined request signals from one or more UE (110) by dialling an L1 number based on which the CTAS (102) may generate, a routing control signal for routing the UE (110) communication to a target site or for supplying one or more corresponding handling strategies to the target site.