Researchers Find Way to Boost Wi-Fi Performance 400-700 Percent

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Researchers at North Carolina State University have developed a software platform that could boost the throughput of existing Wi Fi devices by around 400 700 percent when used in highly congested areas.

The software upgrade not only improves downlink goodput by 400-700 % but also reduces request's average response time by 30-40%.

Wi-Fi traffic gets slowed down in high-population environments because computer users and the Wi-Fi access point they are connected to have to send data back and forth via a single channel.

If a large number of users are submitting data requests on that channel, it is more difficult for the access point to send them back the data they requested. Similarly, if the access point is permanently given a high priority - enabling it to override user requests in order to send out its data - users would have trouble submitting their data requests.

Either way, things slow down when there is a data traffic jam on the shared channel.

Now NC State researchers have created WiFox, which monitors the amount of traffic on a Wi-Fi channel and grants an access point priority to send its data when it detects that the access point is developing a backlog of data. The amount of priority the access point is given depends on the size of the backlog - the longer the backlog, the higher the priority. In effect, the program acts like a traffic cop, keeping the data traffic moving smoothly in both directions.

The research team tested the program on a real Wi-Fi system in their lab, which can handle up to 45 users. They found that the more users on the system, the more the new program improved data throughput performance. Improvements ranged from 400 percent with approximately 25 users to 700 percent when there were around 45 users.

This translates to the WiFi system being able to respond to user requests an average of four times faster than a WiFi network that does not use WiFox.

"One of the nice things about this mechanism is that it can be packaged as a software update that can be incorporated into existing WiFi networks," says Arpit Gupta, a Ph.D. student in computer science at NC State and lead author of a paper describing the work. "WiFox can be incorporated without overhauling a system."

The paper, "WiFox: Scaling WiFi Performance for Large Audience Environments," will be presented at the ACM CoNEXT 2012 conference. The paper was co-authored by Jeongki Min, a Ph.D. student at NC State, and Dr. Injong Rhee, a professor of computer science at NC State. The research was supported by the National Science Foundation.

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