4G very low speed connection

DUDU-Meng

Karol
This device does not support all carrier bands.
You may try using a SIM card from another carrier.

Mikescotland

DUDU-Meng if the band wasn't supported there would be no connection and data transfer at all. If Dudu connects to 4G in this network, means this particular band is supported.
Besides, this customer is in Poland where all networks use bands that are supported by Dudu. Same as pretty much anywhere in Europe.

DUDU-Meng

Mikescotland
Many can be supported by changing the APN, but only the currently supported frequency bands will be available.
For example, China's broadcasting and telecommunications operators share many base stations with China Mobile, though not all. By modifying the broadcasting operator's APN to access the internet, only the same frequency bands as China Mobile will be supported. Other exclusive bands will not be detected.

Mikescotland

DUDU-Meng not sure if I get what you're trying to say especially that it's in relation to your answer "device does not support all bands".

In Poland, internal 4G roaming doesn't care what band you're using, internal roaming (if any, it's almost non existing) can use any available band from roaming operator.
All bands in Poland are supported by Dudu modem (I checked).
Internet is painfully slow in this supported channel.
Either we can agree that 4G modem is quite bad in Dudu, or devs should try to pinpoint the problem.
As all bands in the UK are also supported, my operator does not share 4G infrastructure and does not allow internal roaming, I'll try to do a test tomorrow or after to see how the speed differs between my phone and Dudu with the same SIM card. My operator is quite good, around 1Gbps on 5G and 200 Mbps on 4G.
I assume Dudu modem doesn't have 4G+ (carrier aggregation, MiMO, cell aggregation etc)?

ciubaka

Mikescotland the issue is with one operator in Poland (Orange), all other operator work fine although the speed can't be compared with phones. In case of Orange the speeds may be very low (like Karol showed) - below 1Mbps.

Modem doesn't have the carrier aggregation although UIS7870 supports that. I've told about this issue many times but there's no solution and it doesn't depend on DUDU or even FYT. Unisoc has to fix this.

DUDU-Meng

Mikescotland
Currently, Unisoc basebands in Poland only support the following frequency bands:
FDD-LTE: B3, B7, B8, B20
WCDMA: B1.
If any carrier operates networks on other frequency bands, they will not be supported.

Petergriffin

Karol

Yo tambien voy a hacer test de velocidad en mi DUDU7 , yo uso en mi segunda residencia una Router/Wifi LTE 4G ,con tarjeta de misma compañia que la que uso en DUDU7 y en el Router Wifi de mi segunda residencia me da entre 60 y 90 Mb/s medido con TV Android TV integrado, conectado a TV mediante Wifi no con Cable.

Comparare medidas entre DUDU7 4g y Tv conectada a Router LTE Wifi 4G .

Pero como te pasa a ti, se me antoja muy lenta la velocidad en DUDU7 4G.

Resido en España.

MihaiFlorin

DUDU-Meng What about the band aggregation? Will this be implemented in the future?

ciubaka

DUDU-Meng Orange uses exactly those bands in Poland: B1, B3, B7, B20

Mikescotland

ciubaka @DUDU-Meng and all of these bands in poland dont have bandwidth less than 10 Mhz (with one exception of one operator 5Mhz on B20, rarely used), so max theoretical speed would be 50Mbps. Real speeds I'd expect half of it (and it's consistent with a phone with LTE+ off). So clearly something is wrong with Dudu modem, not "band is not supported". If it was, I'd see X next to the antenna icon as..

DUDU-Meng

Mikescotland
The currently supported frequency bands represent the maximum range achievable by Unisoc chips. Future optimization of the baseband will be required from Unisoc.

Mikescotland

DUDU-Meng it doesn't explain why download rates are so slow. In supported bands!

ciubaka

DUDU-Meng we don't blame you about it at all - just to be clear. But it needs to be resolved, sooner or later. People complain that their previous, cheaper devices didn't have such low speeds.

The biggest problem is that most of the customers use Orange SIM cards because this operator has the best mobile data offer in prepaid model. Such speeds on DUDU7 makes them to change to the more expensive operator.

Karol

Ok., thanks you for the detailed explanation