How to improve Internet via LTE router on PC?

At the new place of residence (Europaplatz Stuttgart) we only have access to max. 16 instead of the previous 50 Mbit DSL. We got the LTE router Huawei B315s-22 on the recommendation of 1&1, then bought Huawei antennas for it. Router is in my friend's room - she needs LAN connection because of Twitch streaming. I sit in the living room with a hallway in between.

TV Telefunken did not work over WLAN at first, but with antennas, it was also very reliable. Nothing on my PC. Do not have a network card, use FRITZ! WLAN Stick N v2. Driver is installed. Connection rarely works, WLAN shows about 30%, but have never successfully loaded a website. So I was connected to the LTE router with a 15 m cable.

Questions now:

How do I get sufficient internet (LAN / WLAN) even without a LAN label?
Does it fail on the WLAN stick (TV works yes)?
Would a repeater help? Product recommendations for "beginners"?
Or rather a powerline adapter? Latest find in research, so I'm completely clueless. Would also like to stream if necessary, so LAN via socket would probably make more sense. Also product recommendations?
And anyway: is my Huawei router antenna combination the best investment at all?

I'm very grateful for any advice.

Of course, your situation sounds bad.

In general, I would not recommend the option of buying a repeater. Since you already have only 16mbit / s, the repeater will halve your data throughput again = more loss.

DLAN is not much different. DLAN works via the in-house power grid. However, if problems occur in the in-house power or many devices are connected via it, there may also be strong fluctuations in connection and speed. The data throughput is also significantly less.

The problem that I see with you is that the LTE router only supports 2.4 GHz Wi-Fi, which is very vulnerable. It is disrupted by any Bluetooth communication as well as microwaves and other WLANs. Therefore, your connection with the WLAN stick can also break. Above all, it happens when you live in a housing development in which there are more Wi-Fi networks from neighbors.

In my opinion, you could either try a PCIe WLAN card here. You can get cards with 2.4 GHz WLAN support quite cheap.

On the other hand, you can still try DLAN. Adapters for this are also not necessarily so expensive because you use 16Mbit / s.

Do a speed test (upload) with LAN connection - is the data rate sufficient for 2 x upload?
if possible, stick to the LAN cable
whether repeater or powerline is better depends on the specific situation. If the sockets are in the same circuit (look in the fuse box), this could be the best option.
You can get a repeater with 300 MBit / s for less than 20 euro. With just one device, I have had good experiences with the cheapest from TP-Link. The risk is very manageable - so I would start with this. Your stick can do 300, the router only 150 Mbps, but that's still faster than the internet connection.

Conclusion: I would buy a repeater and try it.

Thanks for the detailed answer! Sorry, I forgot one very important detail: the reason for the LTE router. Because of the 16 Mbit, we have now terminated DSL at 1&1 and tested the tariff 1&1 All-Net-Flat XXL Unlimited (in the THEORIE 225 MBit) - we were recommended by 1&1. Upspeed is actually higher, downspeed is not really faster. Both at about 10-16 Mbit over LAN. Don't know if Telekom's hybrid contract would be better…

Would a better LTE router make sense? So more performance = less susceptible? Or am I not getting much more from the radio mast? Are here in the high-rise building with 32 parties. In addition, other high-rise buildings.

Would a WLAN card also be less vulnerable than the WLAN stick? If so, I would get one. If not, I would give DLAN a try.

All in all on the subject of "vulnerable": I know that it is difficult to say something precise here without knowing the exact circumstances in the house. But I'm grateful for every little assessment and technical know-how.

Thank you for your answer! Upspeed is surprisingly high at around 15 Mbit - although my girlfriend is currently streaming.

I'm going to order a repeater and think about Powerline as well.

OK. I took a closer look at the whole thing. I'm not 100% sure, but the slow download speed can happen for two reasons:

The Huawei router uses LTE. LTE (4G) itself can reach up to 500 mbit / s (theoretically). However, if many people access this network and then the same mast, it can happen that the speed drops significantly. However, I don't think that's the problem. My tendency is towards option 2
What can also be that the router does not use LTE to establish the connection, but rather UMTS. UMTS is the standard for 3G networks and, together with other protocols, amounts to approximately 42 Mbit / s. Of course, it has been around for a long time now that many people access the same transmission tower 3G losing massive speed. That would also explain the 16 mbit / s download rate for you.

The question would be whether you have the option to issue UMTS in the router settings. If so, then give it a try. If no, another router can theoretically help.

Otherwise I can't think of any other way to do it. Since you already said that even with LAN, the speed is underground.

The whole thing listed here is my opinion and has no guarantee that it will work. Therefore, you have to decide for yourself how far you want to spend money. Because such devices are not exactly cheap.