path: root/src/osmo-bts-sysmo/main.c
diff options
authorHarald Welte <laforge@gnumonks.org>2014-08-22 02:46:15 +0200
committerHarald Welte <laforge@gnumonks.org>2014-08-24 10:46:21 +0200
commite43feaf231e08f108aafa26a7829820fad3447cb (patch)
tree06b0fe4d89e8c2c4194dcb7e1ae0378b48dae1fc /src/osmo-bts-sysmo/main.c
parentfcca2e82184f8ece6a31db48abd77d560065b31f (diff)
New generic transmit power handling
In order to support transmit power reduction by thermal management as well as the variety of new internal / external PA configurations of BTSs, we need a slightly more complex system. Also, as at high power a single dB can be quite a big difference, we are now doing all computations in milli-dB(m), i.e. 1/10000 bel. Ramping is now used both for up and down ramping, as that is useful in cases where you want to gracefully shut down a cell by shrinking its radius, gradually handing over subscribers to neighboring cells. Furthermore, this code is becoming part of the 'common' codebase, as it is not really specific to how sysmobts is working. The user can specify a single aggregate value for external system gain/attenuation. Let's say you have 1dB loss of antenna cable, so you can put that as 'user-gain -1' into the config, which means that a 'transmit power of 20dBm' will be compensatet for that and the TRX is instructed to output 21dBm to compensate the cable loss. Similarly, external PAs can be described by a positive user-gain. One of the next steps will be to communicate those values and the nominal power capability of the specific BTS to the BSC, so the BSC will automatically show correct signal levels in the VTY and log files. The code includes provisions for future extensions regarding * an external and an internal PA with calibration tables * a thermal attenuation setting to be controlled by the site manager
Diffstat (limited to 'src/osmo-bts-sysmo/main.c')
1 files changed, 1 insertions, 5 deletions
diff --git a/src/osmo-bts-sysmo/main.c b/src/osmo-bts-sysmo/main.c
index 5a864074..d12421df 100644
--- a/src/osmo-bts-sysmo/main.c
+++ b/src/osmo-bts-sysmo/main.c
@@ -84,11 +84,7 @@ int bts_model_init(struct gsm_bts *bts)
rc = 23;
bts->c0->nominal_power = rc;
- /* Initial values for the power adjustments */
- bts->c0->pa.max_initial_power = 23;
- bts->c0->pa.step_size = 2;
- bts->c0->pa.step_interval = 1;
+ bts->c0->power_params.trx_p_max_out_mdBm = to_mdB(rc);