Change in osmo-bsc[master]: hodec 2: favor moving dyn TS

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neels gerrit-no-reply at lists.osmocom.org
Wed Nov 18 13:49:44 UTC 2020


Hello Jenkins Builder, pespin, 

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

    https://gerrit.osmocom.org/c/osmo-bsc/+/21204

to look at the new patch set (#5).

Change subject: hodec 2: favor moving dyn TS
......................................................................

hodec 2: favor moving dyn TS

When a used timeslot gets moved to another timeslot for load balancing, prefer
moving a dynamic timeslot, as illustrated by handover_test.c test 30.

Rationale: freeing up a dynamic timeslot is better for PDCH availability, as
well as for flexibility in timeslots. Test 30 shows that when freeing a static
TCH/F even though a dynamic one with identical ratings is in use, later
handovers to a TCH/H may become impossible, because no more dynamic timeslots
are available to switch to TCH/H. A freed dynamic timeslot allows congestion
resolution to continue and reduce more TCH/F to TCH/H.

The scope of this preference is per-TRX, where the RXLEV ratings used for
picking a target lchan are the same by definition. In other words, this never
overrules picking another lchan that has better RXLEV.

Among lchans on dynamic timeslots that could be moved, this code favors moving
later lchans; mainly because it makes for a simpler condition in the code.

Change-Id: Ic221b8d2687cdec0bf94410c84a4da43853f0900
---
M src/osmo-bsc/handover_decision_2.c
M tests/handover/handover_test.c
2 files changed, 16 insertions(+), 5 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/04/21204/5
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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: Ic221b8d2687cdec0bf94410c84a4da43853f0900
Gerrit-Change-Number: 21204
Gerrit-PatchSet: 5
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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