I realize this is off topic, but if you have such severe range differences between CS and PS performance, it is probably a GPRS uplink power control configuration problem.

Note: I am no longer affiliated with Range Networks, just trying to be helpful.

On Jan 23, 2014, at 20:12, Ralph A. Schmid, dk5ras <ralph@schmid.xxx> wrote:

OpenBTS supports GPRS, but at least for me it does not work very reliably, I consider this only a proof of concept. While voice/SMS range is up to 200m, GPRS breaks down after 5m (!) distance, and the connection stalls after a while, requiring a restart of OpenBTS. I am using an USRP1 with WBX board.

Ralph.