DL - 4G Americas

� Gateway Mobile Location Center
o Receives and processes Location Requests from LCS clients
o Obtains routing information from HSS via Lh/SLh and performs registration authorization
o Communicates information needed for authorization, location service requests and location
information with other GMLC over Lr
o Checks the target UE privacy profile settings in the PPR over Lpp
o Depending on roaming, may take the role of Requesting GMLC, Visited GMLC and Home
GMLC
� Location Retrieval Function
o Responsible for retrieving location information and providing to E-CSCF via the Ml interface
o Can either be co-located with the GMLC or standalone
o Provides routing and/or correlation information for an UE in IMS emergency session
� Evolved Serving Mobile Location Center
o Manages the overall coordination and scheduling of resources required for the location of an
UE that is attached to E-UTRAN
o Calculates the final location and velocity estimate and estimates the location accuracy (QoS)
o Interacts with UE to exchange location information applicable to UE assisted and UE based
position methods
o Interacts with E-UTRAN to exchange location information applicable to network assisted and
network based position methods
� Mobility Management Entity
o Responsible for UE subscription authorization
o Coordinates LCS positioning requests
o Handles charging and billing
o Performs E-SMLC selection (e.g. based on network topology to balance load on E-SMLC,
LCS client type, requested QoS)
o Responsible for authorization and operation of the LCS services
� Home Subscriber Server
o Storage of LCS subscription data and routing information
� Privacy Profile Register
o Facilitates check for privacy configuration information
www.4gamericas.org February 2011 Page 121