Cognitive Radio - 802.22

Primary User Emulation attack in Cognitive Radio
Code for this is available at and can be used from NetSim v9 onwards 
Tue, 19 Apr, 2016 at 4:06 PM
How do secondary users switch channels in NetSim CR ?
The switching to another channel by the secondary user (CR CPE) occurs when an incumbent comes on. However, the switching will not be done to an adjacent ch...
Fri, 1 Mar, 2019 at 2:51 PM
How is spectrum sensing done in NetSim 802.22 library?
NetSim Cognitive Radio library detects spectrum usage based on whether the primary user (incumbent) is inside / outside the keep out distance from the se...
Sat, 30 Mar, 2019 at 11:18 AM
What packets does the SU send when it senses PU in 802.22 CR networks?
The Secondary Users (CR CPE) send UCS_Notification(Urgent Coexistence Situation) Packets to the Base Station when they detect the presence of Primary Users ...
Fri, 31 Mar, 2017 at 11:29 AM
Why is it preferred to disable TCP in 802.22 simulations ?
In 802.22 simulations, the secondary stops transmissions when the primary comes on. Since the transmissions are stopped the TCP RTO Expires and window drops...
Wed, 17 May, 2017 at 8:29 AM
Notes on Cognitive Radio implementation in NetSim
Given below are some important points users should keep in mind when running 802.22 cognitive radio simulations CR BS allocates max one symbol per CPE. I...
Tue, 25 Jul, 2017 at 12:30 PM
How is the PHY data rate calculated in 802.22 Cognitive Radio?
Data rate in 802.22 depends on the following parameters · No. of bits per symbol · Coding rate · Cyclic prefix · Symbol duration Data rate i...
Wed, 1 Nov, 2017 at 12:22 PM
How I delay the sensing of the primary (incumbent) by the secondary?
Let us say there is some delay in sensing the primary. This would mean that there is a delay in sending the UCS. To incorporate this In the file SpectrumMa...
Mon, 26 Mar, 2018 at 4:56 PM
How to add spectrum sensing time in Cognitive Radio network?
Spectrum sensing is one of the most important components of cognitive radio (CR) technology. The delays in sensing idle channels for SU data will have a dir...
Mon, 2 Apr, 2018 at 4:26 PM
How do I modify the Cognitive Radio device parameters during run time?
If you are going to set your own value for say transmit power at the start of the simulation itself, then you can update the values in the init function its...
Mon, 2 Apr, 2018 at 4:34 PM