Domain Selection for Routing Control in CS and IMS Networks
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Solution Overview
Problem
Existing domain selection methods in communication systems do not consider call statuses in Circuit Switched (CS) and IP Multimedia Subsystem (IMS) networks, leading to issues where incoming calls are delivered to the wrong domain, causing users to receive multiple calls simultaneously, which they cannot answer due to the limitation of one audio I/O channel.
Innovation Solution
A method and apparatus for domain selection that obtain and consider call statuses in both CS and IMS networks to select the appropriate domain for delivering incoming calls, ensuring that subsequent calls are routed to the domain with an existing call, thereby avoiding simultaneous delivery across both domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If domain selection is made without considering call statuses, then routing decision is simple and fast, but incoming calls are delivered to wrong domain causing users to receive multiple calls simultaneously
Solution Approach 1:
The patent applies preliminary action by obtaining call status information before making routing decisions. The routing control entity queries call statuses in both CS and IMS domains prior to domain selection, ensuring that calls are routed to the correct domain based on existing call states, thereby preventing simultaneous call delivery to multiple domains.
Solution Approach 2:
The patent implements feedback by continuously monitoring and querying call statuses in both CS and IMS domains. The routing control entity uses this feedback information to dynamically adjust domain selection decisions, ensuring that subsequent calls are routed to the domain where the user already has an active call, thus improving call delivery accuracy.
2Reliability
If call statuses are obtained and considered for domain selection, then correct domain is selected for incoming calls, but routing control process becomes more complex
Solution Approach 1:
The patent applies universality by designing a routing control entity that handles both CS and IMS domain routing functions. This multi-functional entity can query and process call statuses across different domains and make unified routing decisions, thereby managing the complexity through a single versatile component rather than separate specialized systems.
Solution Approach 2:
The routing control entity acts as an intermediary between the incoming call and the target domain. It mediates the routing process by querying call statuses, determining the appropriate domain based on existing calls, and directing subsequent calls to the correct domain, thereby simplifying the overall system architecture while maintaining high routing accuracy.
3Adaptability or versatility
If users can receive calls in multiple domains simultaneously, then service coverage is expanded, but users cannot answer all calls due to single audio I/O channel limitation
Solution Approach 1:
The patent applies preliminary anti-action by preventing the harmful situation of simultaneous call delivery to multiple domains before it occurs. By querying call statuses and making informed routing decisions in advance, the system avoids delivering calls to domains where the user is already occupied, thereby eliminating the problem of unanswerable calls while preserving multi-domain service coverage.
Solution Approach 2:
The patent implements dynamics by making routing decisions adaptive to real-time call statuses. The system dynamically determines which domain should receive subsequent calls based on the current state of calls in both CS and IMS domains, allowing the routing behavior to change flexibly according to user activity rather than following a fixed pattern.
Data Source
AI summary
A method of domain selection for routing control, applied to a communication system including a Circuit Switched (CS) network and an IP Multimedia Subsystem (IMS) includes: obtaining call status(es) of a user in any one or both of the CS network and the IMS; selecting a domain via which an incoming call is to be delivered according to the call status(es) upon receiving a routing decision query request from a routing decision query entity, and indicating the routing decision query entity to deliver the incoming call via the CS network or the IMS selected. The method provided by embodiments of the present invention selects the domain according to the call status(es) of the user in any one or both of the CS network and the IMS. Therefore, the problem that two calls are respectively delivered via the CS network and the IMS at the same time may be avoided.