channel sensing in CRCN (cognitive radio cognitive network) patch
 

Hello everyone.

My project is to simulate the dynamic spectrum access network which is consisted of some primary and also secondary users, and there are N channels for them to communicate.For example 6 PU, 10 SU and 3 channels.

And below is my network environment

i) Primary users will only communicate within each other and so does with secondary user.
ii) Primary users have the priority to use the channel. If primary user want to use the channel, the secondary users which are using the channel will detect the existence of PU and must free the channel.

I am still working to implement such algorithm and link below is the website that i refer to. I using the CRCN provided by the website.

http://stuweb.ee.mtu.edu/~ljialian/

Here is my problem. In the CRCN the detection of primary user is by sending a packet from a PU which indicates it is a PU.
My lecturer does not want this algorithm. He want me to detect the PU by sensing the channel energy in physical layer.

Can anybody gives me the idea/any website on how to implement channel sensing in ns 2?There are 2 objectives I need to achieve now.

1.SU sense the channel enegy before using it.
2.SU can sense the PU while using channel and free it for PU.

I tried to read through the documentation by CRCN and cant find any helpful information.

Thank in advance and sorry for my lousy english.

I don't have answer to your question, but i have one query. Can you tell me how to know which channel is being used by which node? In "Design Test Case Study" (in the website) they have shown the use of a trace file. I can't find any information on channel use in the trace file.
Moreover what do Traffic and IT file represent? What is their format?

Hey jaibaba,

For you 1st question, i am still working on it and still dont have answer for it.

IT file and trafficfile format.

IT file format
Timestamp node id interference channel id


Trafficfile format
Timestamp node id traffic information

the traffic information means the amount of packet received by current node.

you could read here for more details.
http://stuweb.ee.mtu.edu/~ljialian/C...C%20detail.htm

Thank you very much. I now understand Traffic file.
But in IT file what does the last column represent? I think second last column represent the channel.

I simulated the test4maccon.tcl file.

Channel sensing and detecting PU signal
 

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PU channel sensing
 

saywei89!
I hope you will be fine and enjoying good health.
I just want to know had you successful in implementing you lecturer idea, if yes how you did or from where did you get help.
Thanks

PU Chanel sensing
 

saywei89!
I hope you will be fine and enjoying good health.
I just want to know had you successful in implementing you lecturer idea, if yes how you did or from where did you get help.
Thanks

which channel is being used
 

#2 and #3
Have you got the information needed to know which channel is being used by which node?
If yes pls tell me, i really need that info cause i fed up.

Channel sensing in CRCN
 

hey saywei89, I also need implementation of channel sensing in CRCN. If you understood the idea please share.

thank you

Post #9, @nkthalia.

Ref. post #1 :
""PU by sensing the channel energy in physical layer.""

The "PU code" is available in the "TFRC-CRAHN" patch(es).
http://www.linuxquestions.org/questi...or-4175503446/

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hi ,
i am doing my project in energy efficient channel sensing...if someone got idea about how implementing this using ns2 please share with me

hi latha,
I am working in channel sensing.
Pls contact with me at nayanb2k7@yahoo.com

hi nayanb2k7,
can u please help in spectrum sensing