Question: During an E-UTRAN to HRPD (cdma2000 High Rate Packet Data) handover, what is the primary purpose of the RRC Handover FROM E-UTRA PREPARATION REQUEST message sent by the eNB to the UE?
Option 1: To initiate the release of E-UTRAN resources for the UE.
Option 2: To provide the UE with measurements to trigger handover decision.
Option 3: To establish a direct tunnel between the UE and the HRPD network.
Option 4: To instruct the UE to begin handover signalling towards the HRPD access, including necessary cdma2000 specific HRPD parameters.
Explanation: The RRC Handover FROM E-UTRA PREPARATION REQUEST message initiates the handover process from E-UTRAN to HRPD, signaling the UE to start the procedure and providing essential cdma2000 specific HRPD parameters for a seamless transition between radio access technologies.