I am slowly getting into the field of wireless communications, in particular with WiFi based communications.
802.11 MAC mentions that
A station wishing to transmit first listens to the medium for a predetermined period and If it senses to be IDLE , then it transmits . If the medium is BUSY , it waits for some random time and then again senses the channel
I have two questions here:
What exactly do you mean by SENSING here ? I have a radio A which wants to transmit on 2.45 GHZ. Do I transmit anything dummy data to know if its is buysy or idle ? I am thinking of programming wise
how does radio A knows that channel is busy or idle ? Assuming there is no ACK concept here ?