SIP Emergency Indicator for UE Recognition
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Solution Overview
Problem
User equipment (UE) may not recognize emergency calls made in foreign countries, leading to inadequate handling of such calls, including failure to provide relevant information to Public Safety Answering Points (PSAPs), potential call blocking, or lack of priority 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, 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 and handling reliability deteriorates
Solution Approach 1:
The patent introduces an emergency indicator as an intermediary element within SIP messages. This indicator acts as a mediator that signals to the UE and network elements that a call is an emergency call, enabling proper recognition and handling without fundamentally changing the SIP protocol structure. The indicator can be implemented as a new header field or an existing header field with a specific value, serving as a clear signal between the PSAP and UE.
2Adaptability or versatility
If UE blocks emergency calls from foreign countries, then network security is improved, but emergency service accessibility deteriorates
Solution Approach 1:
The patent implements preliminary action by having the network provide emergency service information to the UE before the emergency call is placed. This includes providing a list of emergency service URIs and indicating whether the UE is allowed to place emergency calls. The network also provides indicators in SIP messages to clarify the emergency nature of calls, enabling the UE to properly recognize and handle foreign emergency calls without blocking them.
Solution Approach 2:
The patent uses feedback mechanisms where the network provides information to the UE about emergency service availability and call permissions. The SIP messages include indicators that feedback to the UE about whether a call is an emergency call, enabling the UE to adjust its handling accordingly. This feedback loop ensures that UEs can recognize and properly handle emergency calls from foreign countries while maintaining security through network-controlled permissions.
3Loss of time
If UE treats all calls equally without priority indicators, then network simplicity is maintained, but emergency call response time deteriorates
Solution Approach 1:
The patent uses a metaphorical 'color change' approach by introducing visual or audible indicators in the UE interface that clearly distinguish emergency calls from regular calls. These indicators (such as special icons, colors, or sounds) provide immediate visual feedback to users and enable the system to apply different handling priorities. The network can also use SIP message indicators to signal the emergency nature of calls, enabling priority routing and faster response times without significantly complicating the overall call handling mechanism.
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).