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Asking for The good performance but simple simulator for analyzing handover in LTE

in LteWorld Forum

I have been doing my final task to simulating inter-MMEi handover. i would ask some questions:
1. What kind of simulator could i use which i can simply applicate for handover?
2. Could here anybody help to explain me about the function or job of S1i interface when inter-MME handover or inter-eNodeBi handover?
3. What parameters that i use to analyze handover performance in terms of S1 interface function?
.thanks. (actually my english is bad [i mean in language])