The S-eNB issues a HANDOVER REQUEST message to the T-eNB passing necessary information to prepare the handover at the target side (e.g., UE Context which includes the Security Context and RB Context (including E-RAB to RB Mapping) and the Target cell info).Based on the received RESOURCE STATUS RESPONSE, the S-eNB can make the decision to proceed further in continuing the handover procedure using the X2 interface. The S-eNB issues the RESOURCE STATUS REQUEST message to determine the load on T-eNB (this is optional).The S-eNB makes the decision to hand off the UE to a T-eNB using the handover algorithm each network operator could have its own handover algorithm. The UE sends the MEASUREMENT REPORT to the S-eNB after it meets the measurement report criteria communicated previously.Its purpose is to instruct the UE to send a measurement report to the network as soon as it detects the thresholds.
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