Question: What is the primary purpose of the header compression service provided by the PDCP layer to upper layers (e.g., RRC or SDAP) in a 5G NR network?
Option 1: To enhance the security of user plane data through encryption.
Option 2: To reduce the overhead of packet headers, increasing efficiency in data transfer.
Option 3: To ensure the integrity of control plane signals against corruption.
Option 4: To manage the prioritization of uplink data compression.
Explanation: Header compression is a service provided by the PDCP layer to minimize the overhead associated with packet headers, thereby optimizing bandwidth usage and improving the overall efficiency of data transfer across the network. This is particularly beneficial in wireless communications where bandwidth is a valuable resource.