Change in osmo-bts[master]: TA Control Loop: Change toa256 switch threshold to 75% of a symbol

[pespin]

Hello osmith, Jenkins Builder, laforge, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/c/osmo-bts/+/25443

to look at the new patch set (#3).

Change subject: TA Control Loop: Change toa256 switch threshold to 75% of a symbol
......................................................................

TA Control Loop: Change toa256 switch threshold to 75% of a symbol

As per 3GPP TS 45.010 sec 5.6.3 Delay assessment error:
"""
the delay shall be assessed in such a way that the assessment error
(due to  noise and interference) is less than 1/2 normal symbol periods
for stationary MS. For MS moving at a speed up to 500  km/h the additional
error shall be less than 1/4 normal symbol period.
"""

Hence, required TA loop calculation should take into account an error of
up to 1/2 + 1/4 = 75% of a symbol. By changing the threshold variable
to that percentage we make sure we take into account bigger deviations
and update TA accordingly.

Related: SYS#5371
Change-Id: I4c5825df4291d3851a113027abf7566de343a190
---
M src/common/ta_control.c
1 file changed, 5 insertions(+), 4 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/43/25443/3
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: I4c5825df4291d3851a113027abf7566de343a190
Gerrit-Change-Number: 25443
Gerrit-PatchSet: 3
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: osmith <osmith at sysmocom.de>
Gerrit-MessageType: newpatchset
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