Call Routing Using UE Location and IMS Registration Status
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Solution Overview
Problem
Conventional call routing decisions in telecommunication networks are based on limited information, often resulting in invite messages taking unfavorable and unnecessary paths, particularly when the call-receiving subscriber is unregistered with the IMS network, leading to reduced efficiency and quality of service.
Innovation Solution
The system provides additional location information, such as PLMN ID, cell ID, and RAT type, to a 5G TAS to make informed call routing decisions, considering whether a circuit-switched or packet-switched domain is necessary, and allows for alternative handling like redirecting to a voicemail server.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If call routing decisions are based on limited information (such as MT-UE preference only), then the decision-making process is simple and fast, but the routing may be unfavorable and unnecessary, reducing service quality
Solution Approach 1:
The system performs preliminary actions by obtaining location information (PLMN ID, cell ID, RAT type) and subscriber registration status before making the call routing decision. This advance preparation ensures that when the routing decision is made, all necessary information is already available, preventing unfavorable routing while maintaining efficient decision-making.
Solution Approach 2:
The system incorporates feedback mechanisms by checking the subscriber's registration status with the IMS network and using this information to adjust the routing decision. The TAS receives feedback about whether the subscriber is registered and uses this feedback, along with location information, to make an informed routing decision that optimizes service quality.
2Reliability
If additional location information (PLMN ID, cell ID, RAT type) is obtained and processed, then call routing accuracy and service quality improve, but the system complexity and information processing requirements increase
Solution Approach 1:
The existing TAS infrastructure is enhanced to perform multiple functions: it not only makes routing decisions based on subscriber preference but also processes location information (PLMN ID, cell ID, RAT type) and registration status. This multi-functionality allows the same system to handle both simple and complex routing scenarios without requiring entirely separate systems.
Solution Approach 2:
The patent introduces an intermediary mechanism where the TAS acts as a mediator between the invite message and the routing decision. The TAS collects various pieces of information (location data, registration status) and synthesizes them into a single routing decision, simplifying the overall system architecture while improving accuracy.
3Reliability
If the TAS requests and processes location information from subscribers, then informed routing decisions can be made to optimize quality of service, but the information request overhead and processing time increase
Solution Approach 1:
The system performs preliminary actions by obtaining location information and registration status before the routing decision is made. By preparing this information in advance, the system ensures that when the routing decision needs to be made, all necessary data is already available, minimizing delays while improving service quality.
Solution Approach 2:
The patent merges multiple information gathering activities into a single coordinated process. The TAS requests location information (PLMN ID, cell ID, RAT type) and registration status simultaneously as part of the routing decision workflow, reducing the total time required compared to sequential information gathering.
Data Source
AI summary
Systems and method are contemplated herein for method for making or facilitating a call routing decision associated with a call (e.g., a voice call, a video call). A TAS may receive the invite message and request location information associated with a mobile-terminating UE (MT-UE) from a subscriber network function (NF). The TAS may receive the location information from the subscriber NF. Based on the location information, the TAS may determine the call routing decision. The call routing decision may include one of routing the invite message to a first domain, routing the invite message to a second domain, redirecting the invite message, or rejecting the invite message.