cellular-infrastructure
/
osmo-bsc
mirror of https://gerrit.osmocom.org/osmo-bsc
9
0
Fork 0
Code Issues Releases Wiki Activity

Disable C/I based MS Power Control Loop by default 

osmo-trx-uhd with a B200 has proven to provide bad (lower than usually
considered good) C/I values due to high noise (even with band filters in
place). Hence, default thresholds (gathered from literature on the topic)
are too high and end up in bad algorithm output decisions.
Furthermore, most users of Osmocom don't use it in densely populated
areas, hence RXLEV based algorithm used when C/I based one is disabled
is good enough.
Let's disable C/I based one by default, and let advanced users which
specific needs to enable and confiure thresholds specifically for their
needs (hardware, cell surrounding conditions, etc.).

Related: SYS#4917
Change-Id: If1a73c60695379bcfcd0f44c6ec6dd659563e279
This commit is contained in:
Pau Espin 2021-11-25 14:42:08 +01:00
parent 88f3c05202
commit 90b689b577
2 changed files with 38 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/osmo-bsc/gsm_data.c
View File

@ -1200,7 +1200,7 @@ const struct gsm_power_ctrl_params power_ctrl_params_def = {
* above the target.
*/
.ci_fr_meas = { /* FR: Target C/I = 15 dB, Soft blocking threshold = 10 dB */
.enabled = true,
.enabled = false,
.lower_thresh = 13,
.upper_thresh = 17,
@ -1222,7 +1222,7 @@ const struct gsm_power_ctrl_params power_ctrl_params_def = {
.h_reqt = 6, /* TODO: investigate a reasonable default value */
},
.ci_hr_meas = { /* HR: Target C/I = 18 dB, Soft blocking threshold = 13 dB */
.enabled = true,
.enabled = false,
.lower_thresh = 16,
.upper_thresh = 21,
@ -1244,7 +1244,7 @@ const struct gsm_power_ctrl_params power_ctrl_params_def = {
.h_reqt = 6, /* TODO: investigate a reasonable default value */
},
.ci_amr_fr_meas = { /* AMR-FR: Target C/I = 9 dB, Soft blocking threshold = 4 dB */
.enabled = true,
.enabled = false,
.lower_thresh = 7,
.upper_thresh = 11,
@ -1266,7 +1266,7 @@ const struct gsm_power_ctrl_params power_ctrl_params_def = {
.h_reqt = 6, /* TODO: investigate a reasonable default value */
},
.ci_amr_hr_meas = { /* AMR-HR: Target C/I = 15 dB, Soft blocking threshold = 10 dB */
.enabled = true,
.enabled = false,
.lower_thresh = 13,
.upper_thresh = 17,
@ -1288,7 +1288,7 @@ const struct gsm_power_ctrl_params power_ctrl_params_def = {
.h_reqt = 6, /* TODO: investigate a reasonable default value */
},
.ci_sdcch_meas = { /* SDCCH: Target C/I = 14 dB, Soft blocking threshold = 9 dB */
.enabled = true,
.enabled = false,
.lower_thresh = 12,
.upper_thresh = 16,
@ -1310,7 +1310,7 @@ const struct gsm_power_ctrl_params power_ctrl_params_def = {
.h_reqt = 6, /* TODO: investigate a reasonable default value */
},
.ci_gprs_meas = { /* GPRS: Target C/I = 20 dB, Soft blocking threshold = 15 dB */
.enabled = true,
.enabled = false,
.lower_thresh = 18,
.upper_thresh = 24,

39
tests/power_ctrl.vty
View File

@ -143,22 +143,22 @@ OsmoBSC(config-ms-power-ctrl)# show running-config
rxlev-thresh-comp lower 10 12 upper 19 20
rxqual-thresh lower 3 upper 0
rxqual-thresh-comp lower 5 7 upper 15 18
ci-thresh fr-efr enable
ci-thresh fr-efr disable
ci-thresh fr-efr lower 13 upper 17
ci-thresh-comp fr-efr lower 5 7 upper 15 18
ci-thresh hr enable
ci-thresh hr disable
ci-thresh hr lower 16 upper 21
ci-thresh-comp hr lower 5 7 upper 15 18
ci-thresh amr-fr enable
ci-thresh amr-fr disable
ci-thresh amr-fr lower 7 upper 11
ci-thresh-comp amr-fr lower 5 7 upper 15 18
ci-thresh amr-hr enable
ci-thresh amr-hr disable
ci-thresh amr-hr lower 13 upper 17
ci-thresh-comp amr-hr lower 5 7 upper 15 18
ci-thresh sdcch enable
ci-thresh sdcch disable
ci-thresh sdcch lower 12 upper 16
ci-thresh-comp sdcch lower 5 7 upper 15 18
ci-thresh gprs enable
ci-thresh gprs disable
ci-thresh gprs lower 18 upper 24
ci-thresh-comp gprs lower 5 7 upper 15 18
...
@ -304,9 +304,34 @@ OsmoBSC(config-net-bts)# show running-config
rxqual-thresh-comp lower 5 7 upper 15 18
...
OsmoBSC(config-net-bts)# ### Check 'ci-thresh-comp disable all' works properly:
OsmoBSC(config-net-bts)# ### Check 'ci-thresh-comp (enable|disable) all' works properly:
OsmoBSC(config-net-bts)# ms-power-control
OsmoBSC(config-ms-power-ctrl)# show running-config
...
ms-power-control
...
ci-thresh fr-efr disable
ci-thresh fr-efr lower 13 upper 17
ci-thresh-comp fr-efr lower 5 7 upper 15 18
ci-thresh hr disable
ci-thresh hr lower 16 upper 21
ci-thresh-comp hr lower 5 7 upper 15 18
ci-thresh amr-fr disable
ci-thresh amr-fr lower 7 upper 11
ci-thresh-comp amr-fr lower 5 7 upper 15 18
ci-thresh amr-hr disable
ci-thresh amr-hr lower 13 upper 17
ci-thresh-comp amr-hr lower 5 7 upper 15 18
ci-thresh sdcch disable
ci-thresh sdcch lower 12 upper 16
ci-thresh-comp sdcch lower 5 7 upper 15 18
ci-thresh gprs disable
ci-thresh gprs lower 18 upper 24
ci-thresh-comp gprs lower 5 7 upper 15 18
...
OsmoBSC(config-ms-power-ctrl)# ci-thresh all enable
OsmoBSC(config-ms-power-ctrl)# show running-config
...
ms-power-control
...