Question: What is the primary purpose of the SLs interface in a telecom network, specifically between the MME and the E-SMLC?
Option 1: To manage UE mobility between different RAN technologies.
Option 2: For billing and charging data exchange related to location services.
Option 3: To convey location requests from the MME to the E-SMLC and corresponding location reports back, as well as for tunnelling core network measurement requests to the RAN.
Option 4: To establish and manage voice over LTE (VoLTE) sessions.
Explanation: The SLs interface is defined for location services functionality, facilitating MME and E-SMLC communication for requesting and reporting locations, and forwarding RAN measurement requests.