Also I am asked why you use this complicated tcl parameters. NS, by default, has the data rate for the MAC set at 2 Mbps. But cards are faster now. My cards are 802.11b, which means they're 11 Mbps, and so we need to change this. Add the following to the beginning of your simulation script:
Mac/802_11 set dataRate_ 11Mb So when you set Phy/WirelessPhy set bandwidth_ 0Mb , that mean there is no bandwidth available, so no traffic will flow through the wireless link. Second point: Study the simple simulation for wirelress link from thw following site, don't start working with your project until understand very well: http://www.winlab.rutgers.edu/~zhibinwu/html/network_simulator_2.html http://www.isi.edu/nsnam/ns/tutorial/index.html Mohammed AbuHajar --- On Fri, 12/4/09, galaxy-huang <galaxy-hu...@163.com> wrote: From: galaxy-huang <galaxy-hu...@163.com> Subject: Re:Re: [ns] what is the differences between these bandwidth_s and rate_s? To: "Mohammed AbuHajar" <mcs...@yahoo.com> Date: Friday, December 4, 2009, 10:52 AM hi, Mohammed AbuHajar, thanks for your help. but what i really confused is that which bandwidth_ is necessary. in my scenario, i set the wireless physical layer bandwidth to ZERO(by adding"Phy/WirelessPhy set bandwidth_ 0Mb"), but it have no effect in my simulation. another question is, In reality, is there existing LL::bandwidth_ and Mac::bandwidth_? whether or not should we set all these bandwidths in our simulation, if not which one is necessary?thank you very much! 在2009-12-04，"Mohammed AbuHajar" <mcs...@yahoo.com> 写道： Data link Layer contains the two units(LLC,MAC) as structure So LL::bandwidth_ refer to the bandwidth of Logical Link layer Mac::bandwidth_ refer to the bandwith of Media access layer Phy::bandwidth_ refer to the bandwith of physical layer Mac802_11::basicrate_ //Rate for Data Frames Mac802_11::datarate_ //Rate for Control Frames Try to see the following site: http://www.isi.edu/nsnam/ns/tutorial/index.html http://www.winlab.rutgers.edu/~zhibinwu/html/network_simulator_2.html#Introduction Regards, Mohammed AbuHajar --- On Thu, 12/3/09, galaxy-huang <galaxy-hu...@163.com> wrote: From: galaxy-huang <galaxy-hu...@163.com> Subject: [ns] what is the differences between these bandwidth_s and rate_s? To: "ns" <ns-users@ISI.EDU> Date: Thursday, December 3, 2009, 11:03 AM hi all, i am confused by the bandwidths when i am wirting a wireless 802.11 scenario. there are many bandwidths and rates: LL::bandwidth_ Mac::bandwidth_ Phy::bandwidth_ Mac802_11::basicrate_ Mac802_11::datarate_ I don't know what are the differences between them? when to use them? Could someone give me the answer? thanks in advance!
