Hi Yibo,

Also can u tell me if there is any documentation on aquasim. I tried finding documentation, but cudn't , so I have been reading up on ns-2, but a lot of things are different. It would be a great help if you can refer me to some doc.

Thanks


On Tue, Mar 4, 2014 at 8:01 PM, souvik dutta <[log in to unmask]> wrote:
Hi Yibo,

Thanks a lot for the explanation. I will try GOAL. While using broadcast MAC itself I also noticed that if I change the position of nodes a bit. The backoffs reduce significantly. Can you say what might be the reason

thanks


On Tue, Mar 4, 2014 at 7:56 PM, Yibo Zhu <[log in to unmask]> wrote:
Hi Souvik Dutta,

That backoff is part of the broadcast MAC. Whenever a node tries to send out a packet, it backs off if its modem is busy. If this happens too many time, it reports 'to many backoffs' and drops that packet. Due to the broadcast feature of VBF, it can only work with broadcast MAC.

If you want a higher packet delivery ratio, you may consider GOAL instead of VBF. GOAL seamlessly combines handshake-based MAC and VBF using cross-layer design. You know, handshake-based MAC significantly outperforms broadcast MAC in terms of collision avoidance. So you could obtain higher packet delivery ratio with GOAL.




On Tue, Mar 4, 2014 at 9:16 AM, souvik dutta <[log in to unmask]> wrote:
Hi Yibo Zhu,

You are right, I have been using broadcast MAC. What is the problem ? I am very new to aquasim




On Tue, Mar 4, 2014 at 7:45 PM, souvik dutta <[log in to unmask]> wrote:
Hi Jalaja,

I read the paper on VBF by Xie et al. But while writing a script do we really need to specify cx,cy,cz if it is as said in the paper.

Thanks


On Tue, Mar 4, 2014 at 7:34 PM, souvik dutta <[log in to unmask]> wrote:
Hi all,

Can somebody tell me what is the meaning of "too many backoffs" and how to avoid it so ensure a very good packet delivery ratio.

Thanks


On Sun, Mar 2, 2014 at 12:24 PM, souvik dutta <[log in to unmask]> wrote:
Hi all,

I was going through NS-2 and aquasim. I found out that NS-2 has its default routing as static routing and it need not be specified in the node specifications. Is the default routing method for UWSN, VBF ? Do we have to use VBF in all network configurations in UWSN, even though there is no need for routing in the scenario(like two nodes sending data to each other)

Thanks


On Wed, Feb 19, 2014 at 3:17 PM, souvik dutta <[log in to unmask]> wrote:
Hi Jalaja,

Thanks a lot.


On Wed, Feb 19, 2014 at 1:44 PM, Jalaja M J <[log in to unmask]> wrote:
They are in different co-ordinate systems and used to take care of source mobility in query processing, as far as I understand. Please read the paper on Vector Based Forwarding by Xie et. al to get a good understanding.

Jalaja


On Wed, Feb 19, 2014 at 9:47 AM, souvik dutta <[log in to unmask]> wrote:
Hi Nusrat,

Thanks for the reply. Can u tell me how is cx,cy,cz different from X_,Y_,Z_ ? How are they related ?

Thanks


On Wed, Feb 19, 2014 at 5:13 AM, Nusrat Nowsheen <[log in to unmask]> wrote:
Hi Souvik,

current 3D address of underwater node I guess.


On 18 February 2014 19:45, souvik dutta <[log in to unmask]> wrote:
Hi all,

Can anyone tell me the use of cx,cy,cz parameters in a UWsink agent ??

Thanks


On Fri, Feb 14, 2014 at 11:20 AM, souvik dutta <[log in to unmask]> wrote:
Hi all,

I am very new to aquasim. I have installed it successfully. I have tried going through the web for any documentation for aqausim that will get me started. I found very good reference and a user tutorial at http://obinet.engr.uconn.edu/wiki/index.php/Aqua-Sim . I wanted to know if there is any other documentation for users, that can help me write a fully functional script. I am also unfamiliar with ns-2. So, should I read up ns-2 documentation first ?

Thanks a lot.




--
Best Regards,
Nusrat Nowsheen
PhD Student
Gippsland School of Information Technology,
MONASH University
Churchill VIC, Australia 3842



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