Question: What is the primary purpose of S1 CDMA2000 Tunnelling procedures over the S1 Interface in E-UTRAN?
Option 1: To interpret and process CDMA2000 signalling by the eNB for direct communication with UE.
Option 2: To carry CDMA2000 signalling between UE and CDMA2000 RAT, facilitating procedures like pre-registration and handover preparation.
Option 3: To establish a non-UE-associated logical S1-connection for CDMA2000 message transport.
Option 4: To modify the content of CDMA2000 messages to align with E-UTRAN specifications.
Explanation: The correct answer, Option 2, accurately reflects the purpose of S1 CDMA2000 Tunnelling procedures as described. These procedures are designed to transport CDMA2000 signalling over the S1 Interface without interpretation by the eNB, supporting various operational preparations between E-UTRAN and CDMA2000 networks. The other options are incorrect because they either imply an active processing role for the eNB (Option 1), suggest a different connection type (Option 3), or propose a modification of message content (Option 4), all of which contradict the specified purpose and behavior of S1 CDMA2000 Tunnelling procedures.