5G • Core Network
LMF
Location Management Function
5G Core entity responsible for calculating exact geographic position coordinates of UEs.
Technical Explanation
The LMF manages positioning resources and calculates UE geocoordinates. It interacts with the RAN via NGAP (N2) using the New Radio Positioning Protocol A (NRPPa) and with the UE via LTE Positioning Protocol (LPP), processing measurements from PRS, SRS, multi-RTT, and GNSS to achieve sub-meter accuracy.
Key Functions
- Computes precise geographic position, velocity, and uncertainty estimates
- Coordinates positioning measurements across gNodeBs via NRPPa
- Exposes Nlmf service interface to external location services (GMLC)
Specifications
3GPP TS 23.273, TS 29.572, TS 38.305
Interfaces
NlmfN2
Related 5G Concepts
Want to memorize 5G concepts like this one?
Study it with SuperMemo SM-2 spaced repetition flashcards.