WiFi router - bad signal in the next room, what to do?

Question

WiFi

Good evening!
If anyone knows how to solve my problem, please help, I don’t have the strength anymore, I spent the whole day trying to achieve nothing (
I have a TP-Link TL-WR1045ND router, the signal in the room with the router is 4 sticks out of 4
But in the next room (2 walls of obstacles are obtained, the wall of the room and the wall of the corridor) is already 1 stick out of 4 and, accordingly, it is impossible to use Wi-Fi normally there .. (only 2 walls and the signal is already barely holding on ...)
At the same time, one of the neighbors
dlink works (name of their network) and I see their signal anywhere in my apartment 4 sticks out of 4!
how can this be? why does my wi-fi blown down to 1 stick in the next room, and my neighbor's wi-fi broadcasts in full throughout my apartment? I'm almost sure that his signal is somehow jamming mine.
By the way, I downloaded inSSIDer, I didn’t quite understand how it could help me, but I found out that this neighbor has a signal of ~ 50 and mine doesn’t drop below 70 ... and he has the only one in the channel graph that displays two digits (2, 5 *) everyone else (including me) one at a time.
I also saw that he, like other neighbors, has a max data rate of 300 (if you open it in more detail, he has two columns, 5-1 shows 300 and 2 shows 130), and I have the only 450, that is, if I understand correctly he has a weaker router model than mine .. (if I'm not mistaken, he should have a simple model that the provider puts for everyone)
* I tried to put different channels - it did not help.
I don’t know how to be, I ruined my mood, can you advise something please?

Answer 1

The sixth Wi-Fi channel is allowed in the Russian Federation . Dot.

Answer 2

The simplest - yes, the middle of the apartment, direct or so visibility
through the openings - try to provide. This is the simplest, and at no extra cost.
Try first. Well, lengthen the cord of the incoming Internet ...
Most likely, this can solve the problem.
Repeaters - it’s also possible, there’s a whole herd of them, for example, from a tplink:
https://www.tp-link.com/en/products/list-10.html
I would take this one from them:
https://www.tp- link.com/ru/products/details/cat-10... ~ about 1500r
but sometimes the repeater does not work well, then it remains:
PowerLink equipment from TP-Link
(there are others, but these are better, IMHO)
for example - a kit (there are many different ones, attention, mostly without wifi)
https://www.tp-link.com/ru/products/details/cat-18... ~ 3000r
the first (smaller) box in the socket near the router (and + the power cord from it - to the router) the
second - in the far room, it turns out the connection between these boxes via power wiring 220,
the second box is an additional wifi access point,
it is easy to set up, in apartments the distances are small, usually it works well.
if you have high speed requirements, and you use poppies
(and other new expensive laptops, etc.),
then this is all somewhat outdated - see equipment with support for the 802.11ac standard
, this is a router, and repeaters, etc., and laptops themselves, of course -
in more new standard, but it is noticeably more expensive.