Dynamic Identity Association in Wireless Roaming Networks
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Solution Overview
Problem
Conventional GSM networks incur roaming charges even when calls are made within the same visited PLMN, as the home PLMN is responsible for terminating calls, leading to unnecessary overhead and charges for both originating and terminating calls.
Innovation Solution
A method and system that dynamically select a local directory number and subscriber identity for a mobile station when it roams, using a decision tree to associate reference subscriber identities with reference directory numbers based on geographical location, time, and membership in groups, allowing the mobile station to access telecommunication services within the visited geographic region without incurring roaming charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the home PLMN maintains a static association between the subscriber's IMSI and a local MSISDN directory number, then the subscriber can access telecommunication services within the home PLMN, but roaming charges are incurred when the subscriber roams to a visited PLMN even for calls within the same visited PLMN
Solution Approach 1:
The patent implements dynamic MSISDN assignment where the system automatically selects and assigns a local MSISDN from a pool of available numbers when a mobile station roams to a visited PLMN. This dynamic assignment allows the subscriber to have a local number in the visited PLMN, enabling calls to appear as local calls and eliminating roaming charges for calls within the same visited PLMN, while maintaining reliable service access through automatic number assignment and routing.
2Adaptability or versatility
If the visited PLMN contacts the home PLMN to obtain subscriber data for roaming services, then the subscriber can receive telecommunication services within the visited PLMN, but additional overhead and costs are incurred
Solution Approach 1:
The patent implements preliminary action by pre-establishing a pool of available MSISDNs in the visited PLMN and pre-configuring the system with criteria for MSISDN selection. When a mobile station roams, the system can immediately assign a local MSISDN from the pre-available pool without needing to contact the home PLMN for each call, thereby reducing network overhead while maintaining roaming service capability.
3Productivity
If a local MSISDN is assigned to a roaming subscriber, then calls to the subscriber can be terminated locally without routing through the home PLMN, but the system must dynamically manage multiple directory numbers and subscriber identities
Solution Approach 1:
The patent implements self-service by enabling the mobile station to autonomously select and assign a local MSISDN from the available pool in the visited PLMN based on pre-established criteria. This self-service mechanism allows the subscriber to have calls terminated locally without requiring continuous intervention or complex manual management of multiple directory numbers, thereby improving call termination efficiency while managing system complexity through automated selection processes.
Data Source
AI summary
A method of providing access to telecommunication services involves receiving a routing information request for terminating a communication with a mobile station located within a visited geographic region, the routing information request including a directory number local to the visited geographic region. A subscriber identity associated with the received directory number is then dynamically selecting from an evaluation of a decision tree, the decision tree associating a reference directory number with a plurality of reference subscriber identities. Each reference subscriber identity is associated with a telecommunications service user, each user being registered to receive telecommunication services within a respective home geographic region, the home geographic region being different from the visited geographic region. The mobile station receives access to the telecommunication services within the visited geographic region via the selected subscriber identity.