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Jason osmocom at lakedaemon.netOn 12/22/2010 05:23 PM, Steve Markgraf wrote: > Hi all, > > On 22.12.2010 17:58, Harald Welte wrote: > >> A number of people want to do some long-term evaluation of their cellular >> environment and would be interested in an 'app' for OsmocomBB that >> continuously >> scans the spectrum and dumps the cell parameters such as >> * ARFCN, Signal Level, SNR >> * frequency synch offset >> * SCH info (BCC/NCC) >> * SI (at least 1-4) from BCCH >> * optional logging of GPS coordinates from a GPS receiver > > Just to avoid any duplicate of work as well: most of this is already > done by cell_log (layer23/src/misc). It iterates over the whole spectrum > and tries to get an Immediate Assignment by sending a RACH to every cell. > It stores SI1-4, GPS position and the TA in a logfile, and using the > gsmmap utility you can create a *.kml map of the calculated cell > positions for Google Earth. > Funny, I was just looking at this last night. Would you mind if I added gpsd support to cell_log? > So what's missing is really only the PCAP support... would you want libpcap (a lot of unnecessary code), or just use the file and packet headers? > ...and a command line > switch to turn off the "active" scanning by sending no RACHs. > Since I'm just learning GSM, I've only compiled with TX disabled. My results have been pretty poor. Is there something I could add to handle passive scanning better? I've been getting nothing from cell_log, layer23, or mobile on lo (although I do see other loopback network traffic). I just started working on this a few days ago, so I'm not surprised. I'll dig into it more. The Getting Started guide was a great help! thx, Jason.