[ns] Fw: DSR bad results using ns2
heyanghappy at sina.com
Thu Apr 26 16:50:21 PDT 2007
I am working for dsr analyse and simulation. When I simulate DSR using ns2-2.29, sometime I get very bad results, but sometime I can alse get normal results.
I simulated dsr protocol in such situation:
In tcl: ifqlen set 50, 802.11 datarate set 11Mb, ratio range set 250m
dsr all opt enable, including ring 0 search, cache reply, salvage, shorten, etc.
I generated six scene files using setdest.exe in the same scene situation as above show.
scene overhead£¨route/data/ratio£©delay£¨s£© pdf(send/recv/ratio)
scene1£º304901/184097/1.656198 0.426943 64292/55843/0.868584
scene2£º7703/204136/0.037735 0.024476 64291/64208/0.998709
scene3£º440132/188394/2.336232 0.767900 64211/50903/0.792746
scene4£º 664971/232313/2.862393 0.679598 64479/30500/0.473022
scene5£º227687/179718/1.266913 0.499662 64277/61165/0.951585
scene6£º8151/157065/0.051896 0.012842 64377/64339/0.999410
I think only scene2 and scene6 are reasonable results, and others are bad results.
In .tr files, the main reason of the dropping packets is ifq and arp.
I have checked Maltz's article "The effects of on-demand behavior in routing protocols for multihop wireless ad hoc networks".
Maltz did this simulation with datarate 2Mb, and all results seems OK.
I don't know what's wrong with my simulation. Can anyone help me! Thank you very much.
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