CSMA/CA
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What does CSMA/CA stand for?
Carrier sense multiple access / collision avoidance
What does RTS/CTS stand for?
Request to send / clear to send
How is data broadcast using wifi?
It’s broadcast over a number of channels which each uses a different frequency.
What is the implication/limitations of using channels over wifi?
• They have certain size or range, each channel is 22 MHz in size • The range can also overlap or bleed through into the next channels range, this is mostly coped with by filtering
What are the steps for CSMA/CA with RTS/CTS?
1) First it checks if the channel is idle 2) If a signal is detected it waits a random amount of time and checks again 3) If it is, it sends a Request to Send 4) It waits for a Clear to Send from the WAP 5) If received, it sends it’s message
What is the hidden node problem and how is it solved?
• When 2 nodes can be heard by the WAP but not each other - the clear to send message solves this