Question: In the context of Evolved Universal Terrestrial Radio Access Network (E-UTRAN), what is the primary purpose of the 'Old BSS to New BSS Information' container during handover procedures?
Option 1: To encrypt sensitive user data transmitted between the EPC and the target RAN.
Option 2: For intra-LTE handovers, to optimize resource allocation in the target cell.
Option 3: To facilitate communication between non-3GPP Radio Access Technologies (RATs) during handover.
Option 4: To transparently pass radio-related information between the handover source and target through the EPC, especially for inter-3GPP RAT handovers from SAE/LTE to GERAN A/Gb mode.
Explanation: The correct answer is Option 4 because it accurately reflects the specified use of the 'Old BSS to New BSS Information' container. This container is utilized for inter-3GPP RAT handovers, specifically from SAE/LTE to GERAN A/Gb mode, to transparently pass radio-related information through the EPC, ensuring a seamless handover process between different radio access technologies.