Wednesday 27 March 2013

NS2 Simulation Environment Setup


Posted by beegalayuvraj at 23:39
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4 comments:

  1. LCW29 March 2013 at 03:39

    hi , how did you control your data rate in your TCL file?

    ReplyDelete
  2. LCW29 March 2013 at 04:03

    I used Mac/802_11 set dataRate_ 1.0e6 to control but, it seems not working

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    Replies
    1. beegalayuvraj29 March 2013 at 09:08

      By Default the data rate will be 11 mbps.you can see the effect in trace file. Data rate is the bandwidth ,basic rate is the data transfer
      rate
      command :

      Mac/802_11 set dataRate_ 11Mb
      Mac/802_11 set basicRate_ 2Mb

      Delete
  3. LCW29 March 2013 at 10:40

    (I'm not good at speaking English Please forgive my bad English)

    Why basicRate_ need to set 2Mb, and how do i know what value should i set when i want to set another dataRate_
    ?

    I read mac-802_11.cc at line #1247 to #1260

    if(dst != MAC_BROADCAST) {
    /* store data tx time for unicast packets */
    ch->txtime() = txtime(ch->size(), dataRate_);

    dh->dh_duration = usec(txtime(phymib_.getACKlen(), basicRate_)
    + phymib_.getSIFS());

    } else {
    /* store data tx time for broadcast packets (see 9.6) */
    ch->txtime() = txtime(ch->size(), basicRate_);

    dh->dh_duration = 0;
    }

    Does it means broadcast use basicRate_ and unicast use dataRate_ ?

    Thank you for your response :)

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