Hello Ralph, Good idea, thank you for the feedback. I'll test this theory as soon as I'm back home next week. It makes a lot of sense to me, so I'm really curious to see if it works in my case as well.
Cheers, Domi ----- Original Message ----- > From: "Ralph A. Schmid, dk5ras" <[email protected]> > To: "Domonkos Tomcsányi" <[email protected]>, "Sandi Suhendro" > <[email protected]> > Cc: "openbsc" <[email protected]> > Sent: Friday, February 14, 2020 9:01:05 AM > Subject: RE: Commercial MSs do not see the network > Another thing, usually even a bad clock is OK, when the phone can’t see any > commercial network. Quite often they sync their clock on some commercial > carrier on power-up and then can’t see any networks with bigger frequency > offset. My solution is placing the phone in a metal cookie box that shields it > from receiving any commercial network, but the SDR right next to it has enough > power to get through. Then the phone starts a more exhaustive search with > sweeping its TCXO over a bigger range. Once the phone has registered I take it > out, and it keeps the connection without issues until phone or BS are > restarted, then the same issue applies. > Ralph. > From: OpenBSC [mailto:[email protected]] On Behalf Of > Tomcsányi, > Domonkos > Sent: Thursday, February 13, 2020 10:07 AM > To: Sandi Suhendro <[email protected]> > Cc: openbsc <[email protected]> > Subject: Re: Commercial MSs do not see the network > Hi Sandi and Joachim, > @Sandi: no worries about spelling :). > @both: thanks for the idea, it is what I was thinking about initially as well. > I will check if I can get a good 10 MHz reference from some device. I was just > informed however that Exynos devices do not need to be examined during my > tests, so I’ll probably put this on hold for now. The lab at our HQ also has a > UmTRX if I recall correctly, so worst case I could always ask them to do the > tests. I just wanted to make sure it is the HW setup, not the config causing > the trouble :). Now I’m confident that it is the lack of the clock source. > Thank you all for chiming in. > Cheers, > Domi >> 2020. febr. 13. dátummal, 2:11 időpontban Sandi Suhendro < [ >> mailto:[email protected] | [email protected] ] > írta: >> Hi Domi, >> Sorry for wrong spell. Wkwkk... >> Have you try with GPSDO? >> Some phone cannot sync or weak with the wave. Worth to try :) >> regards, >> Sandi / DUO >> On Thu, Feb 13, 2020, 02:16 Tomcsányi, Domonkos < [ >> mailto:[email protected] | >> [email protected] ] > wrote: >>> Hello Sandi and Neels, >>> @Neels: :-) \o thanks. >>> @Sandi: >>> Thank you for the idea. I have changed the attenuation to oml, and I could >>> observe the following: >>> All Qcomm based devices now see the network and with a bit of luck they >>> could >>> register: Xiaomi Mi5, Samsung A90 5G, iPhone X. >>> However any Exynos based device (S6, S7, S8) simply refuses to even detect >>> the >>> network. Any time I put in a sysmocom SIM in a Qcomm based device it happily >>> goes on the new network. On the other hand if the same SIM card is plugged >>> into >>> an Exynos device it shows No service and even with manual search it cannot >>> detect the network. >>> I assume with other radio hardware (e.g. umTRX) there are no issues with >>> Exynos >>> devices, so it is most probably the USRP not being good enough I think. >>> However if anybody has any other ideas I’d still be happy to get any >>> feedback >>> and try things out :). >>> Cheers, >>> Domi >>>> 2020. febr. 12. dátummal, 14:20 időpontban Sandi Suhendro < [ >>>> mailto:[email protected] | [email protected] ] > írta: >>>> Dear Tomi, >>>> have you try to set attenuation set to OML and osmo-trx? >>>> osmotrx rx-gain 30 >>>> osmotrx tx-attenuation oml >>>> Im not sure but I saw your attenuation is set. :-) >>>> I think I face the problem before but using Motorola C115/117 cannot >>>> connect, >>>> but it was resolved now long time ago with newer osmo-bts. >>>> regards, >>>> Sandi >>>> On Wed, Feb 12, 2020 at 7:10 PM Neels Hofmeyr < [ >>>> mailto:[email protected] | >>>> [email protected] ] > wrote: >>>>> On Wed, Feb 12, 2020 at 09:42:42AM +0100, Tomcsányi, Domonkos wrote: >>>>>> p.s. It is simply awesome to experience the power of opensource when >>>>>> dealing >>>>>> with 2G. Every step of the way above I was using software created and >>>>>> shared by >>>>> > you guys. It is a great feeling, had to share it :-). >>>>> Thanks Domi!! >>>>> I hope someone has answers your questions, I don't but wanted to wave back >>>>> anyway \o_ >>>>> ~N >>>> -- >>>> Best Regards, >>>> Sandi
