How to increase Wi-Fi speed?

Question

Android

I have Lenovo A516 phone on Android 4.3 shop.lenovo.com/ru/ru/smartphones/a-series/a516/in... and Wi-FI adapter TL-WN727N www.tp-link.ua/products/details/? model=TL-WN727N#spec
As you can see, both devices support IEEE 802.11n, which is up to 600 Mbps.
I do the following: I turn on the access point on the android using Wi-Fi, start the FTP server, connect the computer with the adapter to the smart access point and go to the created FTP server.
It's embarrassing that the speed with such a connection does not exceed 6 MB / s. In the task manager, it shows a connection speed of 72 Mbps and a current transfer speed of 70%. At the same time, the speed of 150 Mbps is written on the adapter. Why does only 50 work for me? Is this a limitation of the phone or am I misconfiguring something?

Answer 1

This is fine.
The standards describe the maximum THEORETICAL speed achieved under IDEAL LABORATORY conditions.

Answer 2

As you can see, both devices support IEEE 802.11n, and this speed is up to 600 Mbps.

From your second link:

Up to 150Mbps Wireless N USB Network Adapter

150 is also up to 600. To work at 600, I suspect 4 antennas are needed.
6MB/s is a great value for a 150Mb/s connection. 150 is the maximum possible speed in one direction, the real speed will never reach 150 due to service traffic, even if both devices are constantly connected at 150. In your case, apparently, due to the quality of the connection, they are not even connected at full speed.

Answer 3

Download insssider see if there is any channel overlap with neighbors
Change the frequency settings if there is an overlap
Connect the other way around, from the phone to the router, since the latter has a stronger signal, there is an option that it will work at higher speeds
Look in the router settings for signal amplification options
Check the work with the phone connected to the charger, the signal will usually be better

Answer 4

Phones usually have only one WiFi antenna. And with one antenna, the speed of an 802.11n connection with an excellent signal will be only 72 megabits / s.
600 Mbps achievable on equipment with 4 antennas:
https://en.wikipedia.org/wiki/IEEE_802.11n-2009

Assuming equal operating parameters to an 802.11g network achieving 54 megabits per second (on a single 20 MHz channel with one antenna), an 802.11n network can achieve 72 megabits per second (on a single 20 MHz channel with one antenna and 400 ns guard interval); 802.11n's speed may go up to 150 megabits per second if there aren't other Bluetooth, microwave or WiFi emissions in the neighborhood by using two 20 MHz channels in 40 MHz mode. If more antennas are used, then 802.11n can go up to 288 megabits per second in 20 MHz mode with four antennas, or 600 megabits per second in 40 MHz mode with four antennas and 400 ns guard interval.