Hi @Cathy did some further tests at a better location.
Whenever there is Band 7 in PCC there is a drop in upload.
I then blocked all but Band 7 - this is Mudi 7
Then I did the same with the ZTE U60 => Which proves that 4G Band 7 has a bad upload rate in general at my location.
Then I “forced” Band 7 into PCC in ZTE U60 (by blocking Band 3 and 20). Even though the Band 7 is weak in upload it manages to aggregate 5G NR Band N28 to improve the upload speed.
If I enable Band 20 and Band 3 again the ZTE MBN seems then to check first what is the best PCC band and decided which one to enable for upload (even before load)
It seems the Telefonica MBN for the Quectel modem module on Mudi 7 is simply missing the intelligence to check what is the best 4G PCC band to enable (in my case unfortunately it chooses very often the worst - here Band 7). On top it does not always do then CA with the 5G band for upload which leads to very bad upload rates in total. Please note it sometimes it does aggregate with 5G but not always see earlier tests in earlier post.
I don´t know what is the parameter for its decision. But its seems simply bad programming. Certainly this could be fixed via firmware upgrade.
Remember I also did cancel my 5G+ (5G SA enabled) contract because the Mudi 7 decided to stick into one 5G SA band instead of enabling CA together with available 4G bands during load?
This is basically the same story: Missing intelligence in MBN programming: The software should tell the modem to enable 4G on top if load is coming in and only stay in 5G SA when there is no load (because 5G SA uses less energy / is more energy effiencient).
And this is in my opinion only valid for O2 Telefonica - which uses the RoW MBN (Rest of World)