QoS (Quality of Service) is designed to ensure the efficient operation of the network when the network is overloaded. Enabling QoS will specify priority levels for some devices or applications. Below are instructions on enabling QoS and adding rules.
To enable QoS go to http://tplinkwifi.net and log in with the username and password set on your router.
Go to Advanced>QoS>Settings
Select Enable QoS checkbox
Input the maximum upload and download bandwidth provided by your service provider
Click Advanced and drag the scroll bar to set the bandwidth priority percentage
Next Add QoS Rules
Set a high priority rule for the ftp server
Click Add in the High Priority section
Select By Application and then select ftp in the list. Scroll down and click OK
Set a middle priority rule for the phone
Click Add in the Middle Priority section
Select By Device and then click View Existing Devices
Select your device from the list
QoS is now implemented