finally I have installed Patch NIST' S WIMAX then however I have tried the simple.tcl example in the /usr/Local/Ns-Allinone-2 .29/ Ns-2 .29/ Tcl/Wimax/ Directory, but a the command ns simple.tcl I obtain as answer : command name "Mac/802_16" while executing "Mac/802_16" set debug_ 0" (file "simple.tcl"). someone has tried this example? Thanks in advance Elena