Hi. > On 05.12.2014, at 06:42 , Pierre Rudloff <[email protected]> wrote: > In the MLS Cell Netword Export Data, there are around 1800 cells with > the MCC code 208 and the MNC code 165. > But this code does not exist in the official list maintained by the ITU: > http://www.itu.int/dms_pub/itu-t/opb/sp/T-SP-E.212B-2014-PDF-E.pdf > > Do you have any idea what this could be?
We are tracking this in https://github.com/mozilla/ichnaea/issues/340 It looks like it's an encoding error happening in the radio drivers on some phones. Those are famous for being buggy and getting hexadecimal vs. decimal values wrong. The other part to this is, that there are some mobile networks codes that aren't assigned globally but instead by local numbering authorities. One example of this are Tetra networks which have a GSM-compatibility mode. So for now we don't use the ITU list as a whitelist, but instead just do a simple range check and accept all mnc values in the 1 to 999 range. This might lead to some invalid networks ending up in our database, but only buggy devices should ask for those for positioning purposes, so it doesn't worsen the quality for the majority of users. Hanno _______________________________________________ dev-geolocation mailing list [email protected] https://lists.mozilla.org/listinfo/dev-geolocation
