SIP Network Type Indication for IMS Calls Across DTM-Limited Networks

Solution Overview

Problem

Existing communication systems face challenges in providing IMS centralized services when wireless devices move between networks with varying DTM capabilities, leading to issues with call setup and supplementary service control, particularly when DTM is not available.

Innovation Solution

A wireless device detects network capabilities and adjusts its communication methods, using traditional 3GPP signaling or USSD tunneling to maintain communication services when DTM is not supported, and informs the home network of its capabilities through IMS registrations and message indications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the wireless device uses IMS centralized services with SIP protocols, then communication capacity and features are improved, but service failures occur when DTM is not available in the network

Engineering Contradiction:

Improveservice availabilityVSAvoidnetwork capability compatibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic adaptation of communication protocols based on network capability detection. The wireless device determines whether to use SIP-based IMS services or fall back to circuit-switched services based on real-time detection of DTM capability in the network, enabling flexible switching between service modes to maintain reliability across heterogeneous networks

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces an intermediary mechanism where the wireless device acts as a mediator between IMS services and the network. By detecting network capabilities and selectively indicating DTM capability, the device mediates between the requirements for advanced IMS services and the constraints of networks without DTM support, preventing service failures through proactive capability negotiation

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the wireless device registers with the IMS home network to access services, then service access is enabled, but call setup fails when DTM is not available in the current network

Engineering Contradiction:

Improveservice accessVSAvoidcall setup success

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies preliminary action by having the wireless device detect and indicate its DTM capability status before initiating IMS service calls. The device performs capability indication in advance (e.g., during registration or before call setup) so that the network can pre-determine the appropriate service mode, preventing call setup failures before they occur

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where the wireless device provides capability information to the network about its DTM status and the network's response is fed back to guide subsequent service selection. This feedback loop enables the system to adapt service usage based on actual network capabilities, ensuring reliable call setup while maintaining ease of service access

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the wireless device switches between networks, then mobility is improved, but service continuity is lost when moving from DTM-capable to non-DCM networks

Engineering Contradiction:

Improvenetwork mobilityVSAvoidservice continuity

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary action by having the wireless device detect and indicate its DTM capability status before initiating IMS service calls. The device performs capability indication in advance (e.g., during registration or before call setup) so that the network can pre-determine the appropriate service mode, preventing call setup failures before they occur

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic adaptation of communication protocols based on network capability detection. The wireless device determines whether to use SIP-based IMS services or fall back to circuit-switched services based on real-time detection of DTM capability in the network, enabling flexible switching between service modes to maintain reliability across heterogeneous networks

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260059466A1Indicating network types to use for sip messages

Publication Date: 2026.02.26 MALIKIE INNOVATIONS LTD

AI summary

In some examples, a user equipment (UE) detects a change in a radio access technology, and in response to the change in the radio access technology, receives information sent by a wireless network. The UE compares the received information to a policy to determine whether a feature is supported by the wireless network, and based on the comparing, sends an indication informing the wireless network which network type of plural different network types to use for sending a Session Initiation Protocol (SIP) message.