Call Control Offload Routing for PSTN to IMS Migration
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Solution Overview
Problem
There is a need for methods to efficiently offload call control services from one network type to another, such as from a PSTN to an IMS network, to take advantage of cost-effective and advanced services offered by different network types.
Innovation Solution
The method involves using an originating party query to detect calls in a first network and routing call control services to a second network by querying a database for routing information, allowing the offloading of call control functions from a GSM network to an IMS network, utilizing a Call Control Offload (CCO) function and routing nodes to manage and route calls effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If call control services are provided by traditional networks (PSTN, 2G wireless networks), then network coverage and reliability are maintained, but service cost increases and network flexibility decreases
Solution Approach 1:
The patent segments call control services by separating traditional network-based call control from IMS-based call control. The system divides the service delivery path into two independent networks (PSTN/2G and IMS), allowing selective routing of calls based on cost and functionality. This segmentation enables operators to route certain calls through cheaper IMS networks while maintaining traditional network reliability for critical routes.
Solution Approach 2:
The patent introduces an intermediary routing mechanism that acts as a mediator between traditional networks and IMS networks. The routing decision logic (implemented in MSCs or gateway MSCs) serves as an intermediary that receives call requests, queries routing information, and directs calls to appropriate network destinations. This intermediary layer enables cost-effective routing without compromising overall system reliability.
2Adaptability or versatility
If call control services are offloaded to IMS networks, then service cost decreases and network flexibility increases, but routing complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring routing information in databases before calls are routed. Routing decisions are based on pre-stored information about calling parties, called parties, and available network paths. This preliminary preparation of routing data eliminates the need for complex real-time routing calculations, reducing operational complexity while maintaining high network flexibility and adaptability.
Solution Approach 2:
The system incorporates feedback mechanisms where routing information is queried and updated based on network conditions and service requirements. The feedback loop allows the routing mechanism to adapt to changing network states, ensuring optimal cost-effective routing while managing complexity through automated feedback-driven adjustments rather than manual configuration.
3Measurement precision
If routing information is queried for each call, then call routing accuracy improves, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-querying and storing routing information in databases before actual call routing is needed. Routing decisions are based on pre-fetched information about calling parties, called parties, and available network paths. This eliminates the need for time-consuming real-time queries during call setup, achieving both high routing accuracy and fast processing by leveraging预先 retrieved data.
Data Source
AI summary
Methods, systems, and computer program products for offloading call control services from a first network of a first type to a second network of a second type are disclosed. According to one aspect, a method includes detecting a call originating from a calling party in a first network of a first type. A database may be queried using information identifying the calling party. In response to the query, routing information may be for a node in a second network of a second type. Call control services may be offloaded for the call to the second network using the node.