Emergency Call Indicator in SIP Messages for Network Reliability
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Solution Overview
Problem
User equipment (UE) may fail to recognize emergency calls made in foreign countries, leading to inappropriate handling of such calls, including failure to provide relevant information to Public Safety Answering Points (PSAPs), potential call blocking, or lack of priority treatment in congested networks.
Innovation Solution
Incorporating an indicator in SIP messages to UE, such as a new SIP header or content-disposition header field, to identify emergency calls, ensuring appropriate handling and priority treatment, and providing location information when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE uses standard SIP protocol without emergency indicators, then device complexity is reduced, but emergency call recognition fails in foreign countries
Solution Approach 1:
The patent introduces an intermediary indicator (such as a SIP header field or content-disposition header) that mediates between the standard SIP protocol and emergency call requirements. This indicator acts as a signal carrier that enables PSAPs and network components to identify emergency calls without fundamentally altering the SIP protocol structure, thus maintaining compatibility while improving recognition reliability.
Solution Approach 2:
The patent modifies existing SIP message parameters by adding specific header fields or content-disposition indicators that change the semantic meaning of SIP messages. These parameter changes allow the system to distinguish emergency calls from regular calls using existing protocol infrastructure, avoiding the need for complex new message structures.
2Reliability
If UE blocks emergency calls without indicators, then call spam is reduced, but emergency assistance is denied
Solution Approach 1:
The patent implements preliminary action by establishing emergency call identification mechanisms before calls are blocked or routed. Network components and PSAPs are pre-configured to recognize the emergency indicators in SIP messages, ensuring that emergency calls are identified and prioritized before any blocking or filtering rules are applied, thus preventing false denial of emergency assistance.
Solution Approach 2:
The patent introduces feedback mechanisms where PSAPs and network components respond to emergency indicators by providing priority treatment and appropriate routing. This feedback loop ensures that identified emergency calls receive immediate attention and are not subjected to normal call blocking or filtering processes, while non-emergency calls continue to be subject to standard spam filtering.
3Reliability
If network treats all calls equally, then network simplicity is maintained, but emergency calls lack priority treatment
Solution Approach 1:
The patent applies local quality by implementing priority handling specifically for emergency calls identified through indicators, while leaving regular call handling unchanged. Network components examine the SIP message indicators and apply differentiated treatment only to calls with emergency indicators, maintaining simple equal treatment for the majority of calls while providing priority service where needed.
Solution Approach 2:
The patent uses parameter changes in SIP messages (emergency indicators) to trigger different network handling behaviors. Network components monitor these parameter changes and adjust their processing logic accordingly, applying priority routing and treatment only when emergency indicators are present, thus maintaining overall network simplicity while enabling emergency priority handling.
Data Source
AI summary
A network component is provided. The network component including a component configured such that the network transmits a response message containing an indicator indicating that a first message is an emergency-related request, and such that the network receives a second message containing information associated with a user equipment (UE).