help for simulation code

[DeSiGneR]

Hi there...

I try to write a program to simulate a wireless network WLAN

Let us suppose that the network consists of 5 nodes (A to E) and the simulation time is 300 seconds.

Also, let us assume the algorithm used as follow: when a node intents to send, it checks the receiver status. If it is a free which means it does not receive or send data from another node, the node starts transmission. If not it delay for a while then try a gain.

let's take the simple scenario:

at T=2 (second no. 2) node A starts sending to B.

at T=3, node C want to send to B. It will check the receiver status and then find the node B is busy. So, it will defer the transmission for a period of time then start a gain.

My question is: I want a way to pick up a transmitter and receiver randomly during simulation time.

for example, at t=4 A sends to C
at t=4.5 D sends to B and so on.

Thank you very much in advance.

[WingedPanther]

It sounds like you'll need a random number generator.

[DeSiGneR]

Not exact..

I have one... but I don't know how can I use it?!!

[Steve.L]

Then you need to RTFM.

[WingedPanther]

Are you asking how to use a random number generator, or how to use it to solve your problem?

[DeSiGneR]

I am asking how to use it to solve your problem?!!

[WingedPanther]

You will need a list of inactive nodes. Count those nodes and generate a random number between 1 and n (the number of inactive nodes). That node becomes the new transmitter.

Next you will need a list of all the nodes except the transmitter. Generate another random number between 1 and m (the number of other nodes). That node becomes the new desired receiver.

[WingedPanther]

You will need a list of inactive nodes. Count those nodes and generate a random number between 1 and n (the number of inactive nodes). That node becomes the new transmitter.

Next you will need a list of all the nodes except the transmitter. Generate another random number between 1 and m (the number of other nodes). That node becomes the new desired receiver.

[DeSiGneR]

Ok ... but that means I simulate one transmission (between one transmitter and one receiver) .

what about the others nodes? Are they still inactive ?!!

I want simulate a number of transmitter and receivers at the same time

[WingedPanther]

How many are going to be starting at any given second? You will need to model which ones are busy, of course.