Gateway Node Emergency Call Session Continuity
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Solution Overview
Problem
Current 3GPP standards do not support emergency calls over untrusted non-3GPP access networks, such as WiFi, and lack session continuity during handovers between 3GPP and untrusted non-3GPP access networks.
Innovation Solution
A method and apparatus for facilitating emergency calls over untrusted non-3GPP based access networks, involving a first gateway node that receives an emergency call request, detects the request, selects an emergency access point name, and establishes an emergency call session with a second gateway node, allowing the terminal device to store the access point name for potential handover to a 3GPP based access network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If emergency calls are enabled over untrusted non-3GPP access networks, then emergency call service availability is improved, but network security and trust management complexity increases
Solution Approach 1:
The patent introduces a gateway node as an intermediary between the untrusted non-3GPP access network and the core network. This gateway node performs authentication, authorization, and security functions, acting as a trusted mediator that enables emergency call service over untrusted networks without requiring the entire network infrastructure to be trusted. The gateway node specifically handles emergency call requests by verifying device credentials and establishing secure communication channels.
Solution Approach 2:
The patent implements differentiated trust management where different parts of the network have different trust levels. The gateway node and core network maintain high security standards, while the access network can be untrusted. This local quality approach allows emergency calls to be enabled over untrusted WiFi networks by confining trust requirements to specific network components (gateway and core) rather than requiring end-to-end trust throughout the entire network path.
2Stability of the object's composition
If session continuity is implemented during handovers between access networks, then service seamless transition is improved, but signaling overhead and network coordination complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-establishing session context and parameters during the initial emergency call setup. The gateway node stores session information and prepares for potential handovers in advance. When a handover occurs, the pre-stored session context enables rapid session restoration without requiring complex real-time negotiation, thus maintaining session continuity while reducing signaling overhead during the actual handover event.
Solution Approach 2:
The patent employs feedback mechanisms where the gateway node continuously monitors network conditions and device location. During handover scenarios, the gateway node receives feedback about network status changes and actively coordinates session transfer between different access networks. This feedback-driven approach enables automatic session continuity maintenance without requiring complex device-side handover management.
Data Source
AI summary
One embodiment of the present disclosure relates to a method implemented by a first gateway node for processing an emergency call from an untrusted non-3GPP access network. The method comprises: receiving an emergency call request initiated from a terminal device over an untrusted non-3GPP based access network; detecting an event of the emergency call depending upon the emergency network access identifier included in the request message; selecting for the terminal device an emergency access point name that identifies an external network providing an emergency call service; and establishing for the terminal device an emergency call session with a second gateway node interfacing with the external network which is identified by the selected emergency access point name. According to an aspect of the present disclosure, there are provided corresponding methods and devices.