Core Network Node AMF Emergency Service Awareness
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Solution Overview
Problem
Current emergency fall back solutions in 5G networks trigger unnecessary fallbacks even if another Access and Mobility Management Function (AMF) within the same core network supports emergency services, leading to potential delays in accessing critical emergency services due to lack of RAN awareness about neighboring cell support for emergency services.
Innovation Solution
The core network node sends information to the RAN node about AMFs that support emergency services, allowing the RAN node to select an AMF that supports emergency services, thereby avoiding unnecessary fallbacks and ensuring timely access to emergency services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RAN node triggers emergency fallback to legacy RAT when emergency services are not supported in the current RAT, then the wireless device can access emergency services through alternative RAT, but unnecessary fallbacks occur even when another AMF within the same core network supports emergency services, causing delays
Solution Approach 1:
The core network node performs preliminary action by sending information about AMFs that support emergency services to the RAN node before the wireless device needs to access emergency services. This advance provision of information enables the RAN node to make informed decisions and avoid unnecessary fallback procedures when emergency services are actually available through the current RAT.
Solution Approach 2:
The system implements feedback by providing the RAN node with information about which AMFs support emergency services. This feedback mechanism allows the RAN node to adjust its emergency service handling behavior based on actual network capabilities, preventing premature fallback to legacy RATs when emergency services are supported through the current RAT via the appropriate AMF.
2Device complexity
If the RAN node lacks awareness about neighboring cell support for emergency services, then the system architecture remains simple, but unnecessary fallbacks occur causing delays in accessing critical emergency services
Solution Approach 1:
The core network node acts as an intermediary by collecting and managing information about which AMFs support emergency services, then providing this information to the RAN node. This intermediary approach enables the RAN node to gain awareness of emergency service support capabilities without requiring complex direct monitoring or configuration mechanisms, thus maintaining relative system simplicity while improving emergency service access timing.
Data Source
AI summary
Methods, a core network node (104A) and a node (102A) in a radio access network, RAN, (102), for enabling emergency services for wireless devices in the RAN. The core network node (104A) sends (2:1), to the RAN node (102A), information about one or more Access and Mobility Management Functions, AMFs, that support emergency services, to avoid an emergency fallback procedure for wireless devices in the RAN. The RAN node (102A) then selects (2:2) an AMF (104B) that supports emergency services for a wireless device (100) in the RAN, based on the received information. Thereby, the wireless device will have immediate access to emergency services and no delaying emergency fallback procedure is performed which could be critical in an emergency situation.