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Calculate RSSI offset based on RxGain configuration

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Prior to this patch, osmo-trx relied totally on proper VTY configuration
being set in "rssi-offset" together with the RxGain set through TRXC in
order to provide correct Uplink RSSI measurements to bts-trx.

With this patch, RSSI is now by default calculated (in LMS and UHD
backends) based on the currently set RxGain, by providing empirically
discovered values. Still, for backward compatibility, the old
"rssi-offset" command will overwrite completely the per-default
calculated rssi offset.
A new optional parameter "relative" is added at the end of the
"rssi-offset" VTY command to flag the value as relative to the newly
per-default calculated value. This way specific setups (like adding a
LNA / RF fronted) can still be expressed while still keeping the
automatic per-default offset.

Related: OS#4468
Change-Id: I8ef78fd20c22c60d61bfb18d80a4a36df4fd6c20
This commit is contained in:
Pau Espin Pedrol
2020-10-13 17:03:37 +02:00
parent 93fee1f163
commit e91544d740
16 changed files with 187 additions and 70 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
CommonLibs/config_defs.h
View File

@@ -47,6 +47,7 @@ struct trx_cfg {
bool multi_arfcn;
double offset;
double rssi_offset;
bool force_rssi_offset; /* Force value set in VTY? */
bool swap_channels;
bool ext_rach;
bool egprs;

12
CommonLibs/trx_vty.c
View File

@@ -231,13 +231,15 @@ DEFUN(cfg_offset, cfg_offset_cmd,
}
DEFUN(cfg_rssi_offset, cfg_rssi_offset_cmd,
"rssi-offset FLOAT",
"rssi-offset FLOAT [relative]",
"Set the RSSI to dBm offset in dB (default=0)\n"
"RSSI to dBm offset in dB\n")
"RSSI to dBm offset in dB\n"
"Add to the default rssi-offset value instead of completely replacing it\n")
{
struct trx_ctx *trx = trx_from_vty(vty);
trx->cfg.rssi_offset = atof(argv[0]);
trx->cfg.force_rssi_offset = (argc == 1);
return CMD_SUCCESS;
}
@@ -580,8 +582,9 @@ static int config_write_trx(struct vty *vty)
vty_out(vty, " multi-arfcn %s%s", trx->cfg.multi_arfcn ? "enable" : "disable", VTY_NEWLINE);
if (trx->cfg.offset != 0)
vty_out(vty, " offset %f%s", trx->cfg.offset, VTY_NEWLINE);
if (trx->cfg.rssi_offset != 0)
vty_out(vty, " rssi-offset %f%s", trx->cfg.rssi_offset, VTY_NEWLINE);
if (!(trx->cfg.rssi_offset == 0 && !trx->cfg.force_rssi_offset))
vty_out(vty, " rssi-offset %f%s%s", trx->cfg.rssi_offset,
trx->cfg.force_rssi_offset ? " relative": "", VTY_NEWLINE);
vty_out(vty, " swap-channels %s%s", trx->cfg.swap_channels ? "enable" : "disable", VTY_NEWLINE);
vty_out(vty, " egprs %s%s", trx->cfg.egprs ? "enable" : "disable", VTY_NEWLINE);
vty_out(vty, " ext-rach %s%s", trx->cfg.ext_rach ? "enable" : "disable", VTY_NEWLINE);
@@ -716,6 +719,7 @@ struct trx_ctx *vty_trx_ctx_alloc(void *talloc_ctx)
trx->cfg.tx_sps = DEFAULT_TX_SPS;
trx->cfg.rx_sps = DEFAULT_RX_SPS;
trx->cfg.filler = FILLER_ZERO;
trx->cfg.rssi_offset = 0.0f;
return trx;
}