thanks for your direction. Before your answer,I watch access-gavideo and I find the LTE System Level Simulator v1.8 that has been downloaded is different from that described in the video.
The video is downloaded from http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7113789&tag=1.My LTE System Level Simulator v1.8 lack some subfiles ,such as non_public_utils, svn, improvement list and eval_MBSFN.m ,LTE_init_car_users.m and so on. It also lacks something about MBSFN in the subfiles.I download the LTE System Level Simulator v1.8 from https://www.nt.tuwien.ac.at/research/mobile-communications/vienna-lte-a-simulators/.I wonder that my error maybe stem from the imperfection of files. Can you send me the latest version and complete information? I will try to do what you say and
observe results.Thanks for your help again.