Question: In an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), what is the primary purpose of the Retrieve UE Information procedure initiated by the eNB for a Narrowband Internet of Things (NB-IoT) User Equipment (UE) using Control Plane Cellular Internet of Things (CIoT) EPS Optimisation?
Option 1: To update the UE's location in the Mobility Management Entity (MME) for paging purposes.
Option 2: To request dedicated bearer resources for a UE handover from another eNB.
Option 3: To obtain the UE's Quality of Service (QoS) Parameters and UE Radio Capability from the MME.
Option 4: To notify the MME of a UE's transition to idle mode, releasing allocated resources.
Explanation: The Retrieve UE Information procedure is used for the eNB to request and obtain the Quality of Service (QoS) Parameters and the UE Radio Capability from the MME, crucial for efficient resource allocation in NB-IoT UEs utilizing Control Plane CIoT EPS Optimisation.