Centralized Supplementary Services Coordination for CS-IMS Handover
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Solution Overview
Problem
Current wireless communication systems face challenges in seamlessly transitioning between different communication protocols and domains, leading to issues with supplementary services management during handovers between Circuit Switched (CS) and IP Multimedia Subsystem (IMS) domains, resulting in dropped or dangling calls.
Innovation Solution
A centralized system that coordinates supplementary services by using a mobile station with both CS and IMS components, communicating with a centralized server via supported transport and signaling protocols, allowing seamless handover and management of supplementary services across domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile device supports multiple communication protocols (CS and IMS domains), then the device can access diverse communication services and networks, but the complexity of managing supplementary services across different domains increases
Solution Approach 1:
The patent introduces a centralized server as an intermediary that manages supplementary services for both CS and IMS domains. The server receives service requests from the mobile device, determines the appropriate domain, and coordinates the service delivery, thereby simplifying the device's complexity while maintaining multi-protocol versatility
Solution Approach 2:
The centralized server is designed to handle multiple functions across different communication domains (CS and IMS) through a single unified platform. It can manage call forwarding, call waiting, and other supplementary services regardless of which domain the call originates from, eliminating the need for separate management mechanisms in the device
2Reliability
If supplementary services are managed independently in each domain (CS and IMS), then domain-specific optimization is achieved, but seamless handover between domains during calls cannot be ensured
Solution Approach 1:
The patent merges the supplementary services management for CS and IMS domains into a single centralized server. This unified approach ensures that service state information is maintained consistently across domains, enabling seamless handover while preventing the complexity of independent management systems
Solution Approach 2:
The centralized server implements feedback mechanisms to track the state of supplementary services across domain transitions. When a handover occurs, the server receives status information and adjusts service delivery accordingly, ensuring continuity without requiring complex device-side coordination
3Reliability
If a centralized server coordinates supplementary services across domains, then seamless handover and service continuity are achieved, but the system architecture becomes more complex
Solution Approach 1:
The centralized server acts as an intermediary that absorbs the architectural complexity away from the mobile device. By centralizing the coordination logic in the network infrastructure rather than the device, the system achieves reliable call continuity while keeping device complexity manageable
Data Source
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AI summary
A mobile station that is configured to facilitate coordination of supplementary services in a centralized fashion may include circuit-switched (CS) domain components that are configured to place voice telephone calls in a CS domain. The mobile station may also include IP multimedia subsystem (IMS) components that are configured to place voice telephone calls in an IMS domain. The IMS components may include a transport component for facilitating communication with an IMS core network. The IMS components may also include a signaling component that is configured to exchange information with a centralized server on the IMS core network via the transport component. At least some of the information that is exchanged with the centralized server may be related to supplementary services for the voice telephone calls in the CS domain as well as the voice telephone calls in the IMS domain.