Change in osmo-bts[master]: rsl: Assign recv pwr to lchan's max ms power

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pespin gerrit-no-reply at lists.osmocom.org
Wed Nov 6 12:02:17 UTC 2019


pespin has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-bts/+/15970 )

Change subject: rsl: Assign recv pwr to lchan's max ms power
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Patch Set 1:

(1 comment)

https://gerrit.osmocom.org/c/osmo-bts/+/15970/1//COMMIT_MSG 
Commit Message:

https://gerrit.osmocom.org/c/osmo-bts/+/15970/1//COMMIT_MSG@7 
PS1, Line 7: rsl: Assign recv pwr to lchan's max ms power
> Maybe I lack the background here, but why does it help to use the receive power as ms max power? So  […]
It's explained in the spec explained above: 
"Based   on   the measurements  performed  on  the  uplink,  TRX  then  attempts  to  keep the  power  control  parameters  within  the  limits  set  by  the MS  POWER  CONTROL  message"

In our case the BSC is not managing the power loop, but the BTS does it (because we don't implement that in BSC, and we tell the BTs to do it by sending the "MS Power Parameters" IE in "MS Power Control" and "Channel Activate" messages in RSL.
So based on signal strength rceived from the MS, the BTS freely decides to adjust the "MS Power" over time in downlink L1 SACCH header sent to the MS. Still, it should attatch to restrictions told by the BSC. The BSC can for instance request a smaller output power due to policy configuration (VTY "ms max power") or because it detected the MS is not capable of more power (thanks to power class available from MS classmark1 and 2).



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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: I0583eef477c33279ee5bfcda80141f365413a276
Gerrit-Change-Number: 15970
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: dexter <pmaier at sysmocom.de>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-Comment-Date: Wed, 06 Nov 2019 12:02:17 +0000
Gerrit-HasComments: Yes
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Comment-In-Reply-To: dexter <pmaier at sysmocom.de>
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