IMS Emergency Indicator in SIP Messages for Cross-Network Recognition

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Solution Overview

Problem

Current IMS systems face challenges in recognizing and handling emergency calls correctly, especially when a UE is used in a different country or network, leading to potential failures in providing relevant information to PSAPs and prioritizing emergency calls.

Innovation Solution

Incorporating an indicator in SIP messages to identify emergency calls, allowing UEs to recognize and prioritize such calls, and sending emergency-related information to PSAPs, including the use of new SIP headers, URNs, and tokens to ensure accurate emergency call handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If UEs are deployed in different countries or networks, then network coverage and accessibility are improved, but the ability to recognize and handle emergency calls correctly deteriorates

Engineering Contradiction:

Improvenetwork compatibilityVSAvoidemergency call recognition

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces an emergency indicator as an intermediary element in SIP messages that mediates between different networks and UEs. This indicator acts as a universal signal that can be recognized across different countries and networks, ensuring that emergency calls are properly identified regardless of the UE's location or the network being used.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The emergency indicator mechanism is designed to be universal and applicable across all IMS networks globally. The same SIP message structure and indicator format can be used in any country or network, allowing the system to maintain consistent emergency call handling while adapting to different network environments.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If standard SIP messages are used without emergency indicators, then message compatibility is maintained, but emergency call prioritization and information provision fail

Engineering Contradiction:

Improvemessage compatibilityVSAvoidemergency information

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The emergency indicator is nested within the existing SIP message structure rather than replacing it. The indicator can be embedded in existing SIP headers or message bodies, allowing standard SIP compatibility to be maintained while adding emergency-specific information layers within the conventional message framework.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The SIP message structure is segmented to include a distinct emergency indicator component that can be independently processed. This segmentation allows the emergency information to be extracted and handled separately from the standard SIP message flow, ensuring that emergency calls receive appropriate prioritization and information handling.

Inventive Principle:

Principle #1Segmentation

3Reliability

If emergency indicators are added to SIP messages, then emergency call recognition is improved, but message complexity increases

Engineering Contradiction:

Improveemergency call recognitionVSAvoidmessage structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The emergency indicator utilizes changes in existing SIP message parameters rather than introducing entirely new message types. By modifying parameters such as priority indicators or existing header fields to indicate emergency status, the system improves emergency recognition while minimizing increases in overall message structure complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9602552B2Coding and behavior when receiving an IMS emergency session indicator from authorized source

Publication Date: 2017.03.21 MALIKIE INNOVATIONS LTD

AI summary

A method is provided for a user equipment (UE) to respond to an emergency-related message sent to the UE. The method comprises the UE receiving a first message containing an indicator indicating that an emergency-related request has been made, the UE recognizing the indicator as an indication that the emergency-related request is related to an emergency, and the UE sending a second message containing emergency-related information about itself.