Does NS3 support CRN(cognitive radio network)?Or is there any CRN-patch for NS3?

buptmuye · 10-10-2013, 10:40 PM

Hello everyone.

My project is about CRN(cognitive radio network).I heared NS3 is better and more powerful for simulation,so I want to use NS3 for the simulation of CRN.However,there seems to be no information about whether NS3 supports CRN(cognitive radio network) or not.

Is there any CRN-patch for NS3?Can anybody gives me the idea on how to expand NS3 to simulate cognitive radio network?

Thank you in advance.

knudfl · 10-11-2013, 02:51 AM

Ns2 : The crcn patch http://www.linuxquestions.org/questions/tags/crcn/
CRCN examples : crcn-examples-032013.tar.bz2
https://docs.google.com/file/d/0B7S2...it?usp=sharing
CRCN : There is also the CRCN GUI, CRCN.jar available
http://faculty.uml.edu/Tricia_Chigan...e%203/CRCN.jar
Ref. http://faculty.uml.edu/Tricia_Chigan...stallation.htm

Ns3 : ? May be ?
Google .. CRN ns3 .. https://www.google.com/webhp?hl=all#hl=en&q=CRN+ns3
Example https://sites.google.com/a/seecs.edu...Simulating-CRN

Napple Search `crn' http://network-simulator-ns-2.7690.n...ery=crn&days=0

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buptmuye · 10-11-2013, 04:20 AM

knudfl,
Thank you for your reply.I remembered it's knudfl that help buptmuye many times,and I appreciate it very much.

The reason why I want to use NS3 is that when I use "setdest"and "cbrgen" to get simulation scenarios with 70 nodes or more, I always got segmentation fault.
I tried to use GDB to debug it,finding the accurate place of the segmentation fault.It was at line 76 in "ns-allinone-2.31/ns-2.31/trace/basetrace.h".However,

I guess the source of the segmentation fault may be CRCN code,or may be the simulation scenarios.However,I still can't solve it from each of the possible source.

Can you help me?

knudfl · 10-11-2013, 05:40 AM

# 3 .

Don't really know what the problem is,
but then again ns2 has some limitations ..

http://www.cs.binghamton.edu/~kliu/r...2code/#speedup :

Quote:

"The implementation of the Packet data structure of NS2 does not math the realities.
The packet in ns2 simulation keeps all packet headers for any protocols implemented in NS2.
For example, a DSR routing packet may keep DSDV, AODV, or even a PING application header.
For this reason, till today, a packet used in ns2 simulation, would have a header size around 40~64KB.
And NO packet would be deleted to release the memory it holds until the end of the simulation.
So for a typical simulation with 100 nodes in ns2 around 1M packets exchanged (of course,
you may reuse the packets already being freed through Packet::free(Packet*).
To learn the implementation of it, please check file common/packet{.h,.cc} ),
you may hold 10% of it, 100K packets, and you may use a memory at least 100K*64KB -> 6.4GB,
which definitely would crash your computer (even it is a super server)."