Re: Summary of GSM RF Power control

On Fri, 19 Jun 2009 10:55:16 CEST, "Dieter Spaar" <spaar(a)mirider.augusta.de> wrote: And here are the measurment results for the BS-11 for each of the four power classes: BS-11, ARFCN 123 BTS Power: 0.03 Watt NM_ATT_RF_MAXPOWR_R RF output 0 12 dBm 1 9.7 dBm 2 7.8 dBm 4 4.7 dBm 6 0.9 dBm BTS Power: 0.08 Watt NM_ATT_RF_MAXPOWR_R RF output 0 17 dBm 1 15 dBm 2 13 dBm 4 8.7 dBm 6 5.5 dBm BTS Power: 0.25 Watt NM_ATT_RF_MAXPOWR_R RF output 0 22 dBm 1 20 dBm 2 18 dBm 4 14 dBm 6 9.9 dBm BTS Power: 2 Watt NM_ATT_RF_MAXPOWR_R RF output 0 32 dBm 1 30 dBm 2 27 dBm 4 23 dBm 6 19 dBm Values larger than 6 for NM_ATT_RF_MAXPOWR_R are not supported. There is most certainly an error in the range of 2 to 3 dB coming from the low-quality cable and some adaptor connectors to connect the BTS to the measurement equipment. I did also play with the power control of the BS-11. As far as I am aware the BTS power control is not enbabled per default in bsc_hack, the measurement results from the BTS confirm that. If I enable the BTS power control I can at least see that the BTS changes the MS power. I have not verified on the phone if the power is really changed, but the RX level of the BTS seem to indicate that it works. There are a lot of parameters to play with so if anyone is interested, just reduce NM_ATT_BS11_RADIO_MEAS_GRAN (lets say to 2) so that you see frequent measurement results and watch what is going on. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de