Question: What is the primary purpose of the UE Context Modification procedure in E-UTRAN, as related to an already established UE Context?
Option 1: To establish a new S1 connection for handover between eNodeBs.
Option 2: To fully replace the existing UE Context with a new set of parameters.
Option 3: To initiate a security key update for all UEs connected to the network.
Option 4: To partly modify specific parameters (e.g., Security Key, Subscriber Profile ID for RAT/Frequency priority) within the established UE Context.
Explanation: The UE Context Modification procedure is specifically designed to allow for partial updates to an already established UE Context. This is useful for updating specific parameters such as the Security Key or Subscriber Profile ID for RAT/Frequency priority, without needing to replace the entire context, ensuring efficiency and minimizing unnecessary signaling in the network.