Re: [ns] NS vs Glomosim: for wireless mobile networks

[John Heidemann <johnh@ISI.EDU>]

>Of course ..you can use as many physical layer types, modulations, coding as you
>like.
>Ns supports multiple ll,mac,phy types at different nodes.
>
>Sridhar guivireddy.
>
>Gatorlink User wrote:
>
>> Hi,
>>      I am a grad student working on wireless mobile networks. I have to begin
>> simulations and I have to decide whether I should use NS or Glomosim. Can anyone
>> help me decide.
>> Does NS allow us to send 2 different type of packets : for example one packet
>> could be using BPSK (Binary Phase shift keying ) and another packet could be
>> using QPSK (quadrature phase shift keying).?
>> Does NS allow us to extract distance and bandwidth parameters between nodes in a
>> network.

As Sridhar says, ns has support for different physical layer types,
but it doesn't currently provide direct support for switching coding
on a packet-by-packet basis.  That would have to be added if it's
critial to your research.

I don't know exactly what you mean by "NS allow us to extract distance
and bandwidth parameters"?  Usually you specify those, so "extracting"
them is trivial.  If you're implying that bandwidth (i.e., modulation)
is autoselected as a function of distance, ns doesn't currently do
that.

   -John Heidemann