IP-Based Interface for Mobile Switching Center Voice Call Routing

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Solution Overview

Problem

Current wireless networks face challenges in providing CDMA2000 features to hybrid mobile stations operating in data mode, as existing methods require expensive A1 interfaces and do not support voice calls effectively in this mode.

Innovation Solution

A method and system utilizing an IP-based network interface to convert call session messages between a mobile switching center and a mobile station, allowing communication through a single A1 interface and enabling CDMA2000 features by converting messages between A1 and IP-based formats using a session control and mobility management module.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the MSC sends a Page Request message using an A1 interface to the PCF unit or base station handling the data session, then the mobile station can be notified of the incoming voice call, but the implementation cost increases due to requiring multiple A1 interfaces

Engineering Contradiction:

Improvevoice call establishment capabilityVSAvoidnumber of A1 interfaces

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

An IP-based network interface is introduced as an intermediary between the MSC and the data session infrastructure. This intermediary enables message routing to mobile stations in data mode without requiring direct A1 interfaces to multiple PCF units or base stations, thereby reducing interface complexity while maintaining voice call establishment capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The IP-based network interface provides multi-functional capability by handling both voice call notification and data session management through a single interface type. This universal interface replaces the need for multiple specialized A1 interfaces, reducing overall system complexity while maintaining full functionality

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple A1 interfaces are implemented to support voice calls for mobile stations in data mode, then call establishment is enabled, but the implementation becomes expensive

Engineering Contradiction:

Improvesupport for CDMA2000 features in data modeVSAvoidinterface infrastructure cost

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The traditional A1 interface mechanism is replaced with an IP-based network interface mechanism. This substitution uses packet-switched networking instead of circuit-switched signaling, enabling the same adaptability for supporting CDMA2000 features in data mode while significantly reducing infrastructure cost and complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If the system uses traditional A1 interface communication, then voice calls can be established, but CDMA2000 features are not available to mobile stations operating in data mode

Engineering Contradiction:

Improvevoice call functionalityVSAvoidCDMA2000 feature availability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent merges voice call functionality with data mode operation by combining previously mutually exclusive technologies. The IP-based network interface enables both voice notification and data session management to coexist, allowing mobile stations to access CDMA2000 features while in data mode without sacrificing voice call capability

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7526320B2Method and system for providing communication between a mobile switching center and a mobile station operating in a data mode using an IP-based network interface

Publication Date: 2009.04.28 SAMSUNG ELECTRONICS CO LTD

AI summary

A method for providing communication with a mobile switching center using an IP-based network interface is provided. The method includes receiving a call session message from a mobile switching center for a mobile station operating in a data mode. The call session message, which is in a first format, is converted into a second format, which corresponds to the IP-based network interface. The converted call session message is sent to a session control and mobility management (SC/MM) module for delivery to the mobile station.