GSM Over Distributed Networks via NAC and MSC Transcoding

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Solution Overview

Problem

Conventional GSM networks using MSS face issues with billing accuracy and call termination due to the use of Foreign Exchange Office (FXO) interfaces, which limit the ability to track call duration and display the correct MSISDN to recipients, and result in high costs for additional GTs and MSRNs, especially in satellite-based mobile networks.

Innovation Solution

A private GSM network architecture that includes a Network Area Controller (NAC) to share GTs and MSRNs among mobile networks, with a processor in the MSC for transcoding voice data and mapping bearer channels, allowing efficient communication over MSS without the conventional billing and call termination issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional FXO interface is used for satellite-based GSM networks, then call transmission to PSTN is enabled, but call duration tracking and billing accuracy deteriorate

Engineering Contradiction:

Improvecall transmission capabilityVSAvoidcall duration tracking accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent introduces a Gateway Mobile Switching Center (GMSC) as an intermediary between the satellite-based mobile network and the PSTN. The GMSC intercepts call setup messages, retrieves the original MSISDN from the HLR, and uses it for routing and billing purposes, thereby enabling accurate call duration tracking while maintaining call transmission capability through the FXO interface

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple GTs and MSRNs are allocated to each mobile network, then call routing capability is improved, but cost increases due to limited availability from signaling brokers

Engineering Contradiction:

Improvecall routing capabilityVSAvoidnumber of GTs and MSRNs required

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent implements a shared pool of GTs and MSRNs that can be dynamically allocated to multiple mobile networks. The GMSC retrieves the appropriate MSISDN from the HLR based on the calling party's network, allowing the same set of GTs and MSRNs to serve multiple networks, thereby reducing the total number required while maintaining full call routing capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the signaling resources (GTs and MSRNs) of multiple mobile networks into a single shared pool managed by the GMSC. Instead of each network having dedicated resources, the GMSC combines them and dynamically assigns the appropriate MSISDN based on the HLR lookup, reducing overall resource requirements while maintaining network independence

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9445255B2System to provide GSM over distributed mobile networks

Publication Date: 2016.09.13 INMARSAT SOLUTIONS

AI summary

A system provides GSM service over distributed mobile networks. A Network Area Controller (NAC) allows Global Titles (GT) and Mobile Station Roaming Numbers (MSRN) of the GSM network to be shared within a private GSM network. A processor within the Mobile Switching Center (MSC) of a mobile network transcodes voice data and maps the data to the proper bearer QoS to allow the use of Mobile Satellite Services (MSS) such as Iridium and Inmarsat.