Hi Samar,
I understand that you are working with Wireless Network Simulator and have few queries regarding it. Regarding your first query, stations are not transmitting with one another directly as the topology of your wireless network is an Infrastructure BSS network. They are communicating with each other only via the Access Point (AP).
Regarding your second query, eventhough, the traffic generation of your simulation is one way, the stations transmit control frames such as RTS and Acknowledgement frames back to the AP as part of the protocol. Therefore stations transmit control frames to the access point.
The 'Simulation data.zip' contains the 'PHY' statistics of each node. To understand more about the different kinds of frames transmitted by the station to the AP, kindly look into the 'MAC' statistics of each node using 'statistics' object function.
>> sta1Stats = statistics(sta1);
>> sta1Stats.MAC
Please refer the below documentation to know more about 'statistics' object function.
