Question: What is the primary purpose of the services provided by the Packet Data Convergence Protocol (PDCP) to upper layers in a UE or eNB?
Option 1: To enhance the quality of voice calls in cellular networks.
Option 2: To manage the handover process between different base stations.
Option 3: To optimize battery life for IoT devices on NB-IoT networks.
Option 4: To ensure secure and efficient transmission of data across the radio access network.
Explanation: The services provided by PDCP (transfer of user/control plane data, header compression, uplink data compression, ciphering, and integrity protection) aim to transmit data securely, efficiently, and reliably, aligning with the goal of facilitating secure and efficient data transmission across the radio access network.