VCC AS Mediator for IN User Voice Call Continuity
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Solution Overview
Problem
The existing Voice Call Continuity (VCC) service specifications do not support Intelligent Network (IN) users of GSM/UMTS, limiting its implementation due to high prepaid user percentages and the inability to subscribe to multiple IN services concurrently, and require significant network upgrades and interconnection testing between different manufacturers' devices.
Innovation Solution
A new SCPvcc is introduced to support VCC services, simplifying interconnection with existing networks, reducing device upgrades, and enabling VCC service for all mobile users by querying and interacting with the SCP, copying relevant messages, and sending new Connect messages to the MSC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing VCC service specifications are used, then the service can be implemented for non-IN users, but it cannot support IN users who account for the majority of the network
Solution Approach 1:
The patent introduces an intermediary component (VCC AS - Voice Call Continuity Application Server) that mediates between the MSC and the SCP. This intermediary translates and adapts signaling messages, enabling the VCC service to work with IN users by bridging the gap between the existing VCC specifications and the IN service framework. The VCC AS acts as a mediator that handles the complexity of supporting both IN and non-IN users through a unified interface.
2Ease of manufacture
If the SCP software is upgraded to implement VCC service, then the VCC service can be provided through existing IN infrastructure, but it affects the IN services already carried by the SCP
Solution Approach 1:
The patent segments the VCC service functionality from the existing SCP by introducing a separate VCC AS component. Instead of upgrading the SCP software which would affect existing IN services, the VCC functionality is isolated in a dedicated server that interacts with the SCP through standardized interfaces. This segmentation allows the VCC service to be deployed independently without modifying or affecting the existing IN service infrastructure.
Solution Approach 2:
The VCC AS serves as an intermediary between the MSC and the SCP, translating signaling messages and protocols. This intermediary approach allows the system to leverage the existing SCP infrastructure for IN services while adding VCC capability through a separate component that does not interfere with the SCP's existing functionality or the IN services it carries.
3Adaptability or versatility
If the interface between VCC AS and SCP is not defined, then interconnection testing between different manufacturers' devices is required, but this increases deployment complexity and time
Solution Approach 1:
The patent establishes a universal, standardized interface between the VCC AS and the SCP that can handle multiple service types and scenarios. This universal interface design allows different manufacturers' devices to interconnect without requiring extensive testing, as the interface is designed to be vendor-neutral and protocol-standardized, enabling plug-and-play deployment across different equipment suppliers.
Data Source
AI summary
A method, network device, and network system for implementing the Voice Call Continuity (VCC) service are provided. The method includes: receiving an Initial Detection Point (IDP) message from a Mobile Switching Center (MSC); querying whether an address of a Service Control Point (SCP) of a user is null; if the address of the SCP is not null, sending the IDP message to the SCP and interacting with the SCP; and detecting whether a subsequent message from the SCP is a Connect or Continue message; if the subsequent message from the SCP is the Connect or Continue message, copying the Connect or Continue message to a new Connect message and sending the new Connect message to the MSC for implementing the VCC service. According to the present invention, a new SCPvcc is used to support the VCC service, thus implementing the VCC service for all mobile users.