UE IMS Registration via Dynamic PDN Type Switching

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Solution Overview

Problem

In the 3GPP protocol, user equipment (UE) fails to register for IMS services when the IP address type of the PDN connection request does not match the type supported by the network, leading to permanent IMS registration failure.

Innovation Solution

A method and electronic apparatus that repeatedly send a first PDN connection request message with an IPv4 single stack, and upon reaching a predetermined number of failures, send a second PDN connection request with an IPv4v6 dual stack, allowing the UE to modify the PDN type without network interaction, reducing radio resource usage and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE sends a PDN connection request with a specific IP address type (e.g., IPv4), then the connection can be established quickly, but the IMS registration fails when the network does not support that IP address type

Engineering Contradiction:

ImproveIMS registration success rateVSAvoidPDN connection establishment process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic switching between different PDN types (IPv4, IPv6, IPv4v6) based on network response. The UE initially requests a PDN connection with a specific type, and upon detecting failure (no IP address received), automatically switches to an alternative PDN type for re-registration, making the registration process adaptive to network conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the PDN type parameter when registration fails. The UE modifies the IP address type parameter in the PDN connection request from the initial type (e.g., IPv4) to an alternative type (e.g., IPv4v6), allowing the same registration process to succeed under different network support conditions

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the UE repeatedly sends the same PDN connection request, then the registration may succeed, but radio resources and power are consumed unnecessarily

Engineering Contradiction:

ImproveIMS registration success rateVSAvoidPower consumption during registration

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Instead of repeatedly sending the same PDN connection request with identical parameters, the patent changes the PDN type parameter on the second attempt. This reduces unnecessary retransmissions by adapting to network conditions, thereby conserving power and radio resources while improving registration success rate

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12200019B2Method for establishing communication connection and electronic apparatus capable of establishing communication connection

Publication Date: 2025.01.14 SAMSUNG ELECTRONICS CO LTD

AI summary

A method for establishing a communication connection includes sending a first packet data network (PDN) connection request message to a network side for internet protocol multimedia subsystem (IMS) registration; repeatedly sending the first PDN connection request message for the IMS registration when the IMS registration fails; and sending a second PDN connection request message to the network side for the IMS registration when a number of times the IMS registration fails reaches a predetermined number. The second PDN connection request message and the first PDN connection request message include different PDN types.