Packet-Switched Session Initiation via ENUM Query Failure Handling

Solution Overview

Problem

Existing network systems face failures in telephone number mapping queries, leading to suboptimal communication session establishment between devices capable of packet-switched communications, often resulting in downgraded circuit-switched sessions due to ENUM query failures.

Innovation Solution

A method and apparatus that determine the communication capabilities of devices and instruct the call session control function to initiate packet-switched communication sessions even in the event of ENUM query failures, ensuring higher quality VoLTE communication by switching to AMR-WB codec when both devices are capable, thereby maintaining packet-switched services.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the system relies on ENUM query failures to determine communication session establishment, then circuit-switched sessions are established as fallback, but packet-switched communication quality is degraded

Engineering Contradiction:

Improvecommunication session establishmentVSAvoidcommunication quality

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system performs preliminary determination of device packet-switched capability before ENUM query, and prepares to initiate packet-switched session directly if capability is confirmed, avoiding fallback to circuit-switched and preserving communication quality

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the system initiates circuit-switched sessions as default upon ENUM failure, then session establishment reliability is maintained, but communication quality is reduced

Engineering Contradiction:

Improvesession establishmentVSAvoidcommunication quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The system performs preliminary determination of device packet-switched capability before ENUM query, and prepares to initiate packet-switched session directly if capability is confirmed, avoiding fallback to circuit-switched and preserving communication quality

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the communication session type parameter from circuit-switched to packet-switched based on device capability determination, thereby improving communication quality while maintaining reliable establishment

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the system uses traditional ENUM query failure handling, then session establishment is ensured, but packet-switched service degradation occurs

Engineering Contradiction:

Improvesession establishmentVSAvoidcommunication efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system performs preliminary determination of device packet-switched capability before ENUM query, and prepares to initiate packet-switched session directly if capability is confirmed, avoiding fallback to circuit-switched and preserving communication quality

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9806938B2Method and apparatus for mitigating network failures

Publication Date: 2017.10.31 AT&T INTELLECTUAL PROPERTY I L P

AI summary

A network may include a method that includes, for example, receiving a communication request responsive to a telephone number mapping query failure, where the communication request is initiated by an originating communication device requesting a communication session with a terminating communication device, foregoing initiating the communication session as a circuit-switched communication session responsive to determining that the originating communication device and the terminating communication device are enabled to use packet-switched communications, and instructing a second network node to initiate the communication session as a packet-switched communication session between the originating communication device and the terminating communication device responsive to the determination. Other embodiments are disclosed.