Feature Description
AMF supports the Mobile-Terminated Location Request (MT-LR) location services for regulatory requirements (Emergency call and Lawful intercept). MT-LR determines the location of the mobile device when receiving incoming calls or messages. The primary purpose of MT-LR is to provide accurate location data to the network.
AMF supports two types of location request, "current location" and "current or last known location". In case of "current or last known location" if the paging for UE fails or positioning fails due to any of the associated nodes, such as: LMF, UE, or gNB, then AMF returns the last known saved location if available.
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Architecture
Location Service consists of the following layers as part of the non-roaming location services architecture:
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UE: The UE represents end-user devices, such as smart phones, tablets, or IoT devices. These devices interact with the network.
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GMLC: GMLC provides the location information services related to mobile devices.
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LCS Client: The LCS client is an external entity or application that requests location information for a specific mobile device.
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LRF: The LRF is a component within the Location Services (LCS) architecture in cellular networks. LRF retrieves and provides the location information for mobile devices or user equipment (UE).
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LMF: The LMF determines the geographical location of the UE.
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AMF: The AMF is a key component in 5G networks. It manages mobility, session management, and security for user devices.
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UDM: The UDM handles user-related data, including authentication, authorization, and subscription information.
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RAN: The RAN connects user devices to the core network. It includes base stations and antennas.
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N1 Interface: The N1 interface connects the UE and the RAN. It carries user data and control signaling.
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N2 Interface: The N2 interface connects the AMF and the RAN. It handles signaling and data transfer between the core network and the RAN.
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NL1 Interface: NL1 interface connects the LMF to the UE.
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NL2 Interface: NL2 interface connects the AMF to the GMLC.
The following diagram describes the high level architecture for location services.