Knowledgebase: Wireless LAN
What is Airtime Fairness
Posted by on 15 June 2015 05:30 PM

Getting Best with Airtime Fairness

Slow devices dominate the shared medium over fast devices in existing Wi-Fi network and performance of the network goes down due to this. Air Time Fairness is now available to solve this problem. It significantly improves range and performance.

Major advantages are:

Increased Speed

It is accomplished by

o   Wider frequency

o   More MIMO (Multiple Input Multiple Output) spatial streams

o   Higher density of modulation

o   Beamforming

Improved Range

With the amazing feature –Beamforming-we get higher speed over long distances.   Instead of radiating in Omni direction, wireless router focuses on the client. It helps in concentrating energy in the direction of the client which improves the performance.

More number of users

It supports simultaneous transmissions to multiple clients with Multi-user MIMO

Reduced Interference

Since 802.11ac is working on a frequency of 5 GHz, there is less interference with other wireless signals compared to previous versions of Wi-Fi.

 

What is Air Time Fairness?

To understand this technology, let’s breakdown the term “Air Time Fairness”. It is fairness by time using air as a medium. That means instead of fairness by packets now fairness by time. Each client gets the same airtime, regardless of client capability and capacity. This option is very useful in environments mix of 802.11a, 802.11g, 802.11n clients are served together. High throughput clients do not get penalized because of slower client transmissions that take more airtime due to lower transmit dates.

For Example, we have two clients A & B. In normal scenario client B will need only ¼ of the time compared client A and which is not fair approach to client B. Client B performs faster but client A’s performance it is getting impacted. Now let us look as the second scenario where we have used Airtime fairness and now both clients are getting same time for transmission. As client B is faster, it can transmit 4 times as compared to client A. Client A transmits the way it was doing before. Network performance will now improve.

 

Picture1

 

Feature Enhancements

Beam Forming: Beam forming transmits data towards direction of the device rather than transmitting in all directions. This kind of focus strengthens communication between transmitter and device. Hence this technology provides wider coverage with more reliability

Picture2

MU-MIMO (Multiple User – Multiple Input Multiple Output)

It supports simultaneous transmissions to multiple clients. Hence multiple clients can receive data simultaneously from a single AP at full channel data rate.

Learn more about Airtime Fairness

Draytek - Performance Test – Watch Now

This video shows real time test results of airtime fairness testing performed by Draytek

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