Question: Which of the following best describes the primary purpose of the 'eNB CP RELOCATION INDICATION' message in an E-UTRAN network?
Option 1: To notify the MME about a UE's handover to a different eNB, requiring updated routing information.
Option 2: To request resource allocation for a new UE attempting to attach to the network.
Option 3: To confirm successful establishment of an S1-connection for a newly deployed eNB.
Option 4: To initiate the setup of a UE-associated logical S1-connection after receiving a re-establishment request.
Explanation: The correct answer, Option 4, aligns with the described functionality of the 'eNB CP RELOCATION INDICATION' message. It is specifically sent by the eNB to the MME to initiate the establishment of a UE-associated logical S1-connection, particularly following the reception of a re-establishment request. This process ensures seamless connectivity and service continuity for UEs (User Equipment) in the E-UTRAN network. The other options do not accurately reflect the primary purpose of this message as per the given context.