ns2的4g（FD-LTE）补丁

针对ns2.35的4Glte补丁，附有补丁/例子和论文。ManymodelshavebeenbuilttostudytheperformanceofLTE/SAE.However,noopensourceLTE/SAEmodelisfound.Itisdifficulttoreuseandevaluatethosemodels.ThispaperproposesanopensourceLTE/SAEmodelwiththeimplementationinNS2.Thisstudyisthefurtherstepoftheearlieronein[3].