My research topic is "security and efficient handover process in 802.21 network" using NS-2 simulation.I am using NIST ns2 patch and i have updated some code for QOS calculation in that.but the handover process for umts is not working and also umts mobility is not enabling for communication before or after editing the code. i have tried in tcl script a lot but umts communication is not enabling. i have attached the tcl script used for this simulation.is it possible to give me some hints to rectify this problem.if you have any related code(tcl code or c++) or materials please provide to me if it is possible .it will be very helpful for me .please consider my request and reply as soon as possible .

Thanking you

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