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Feature #3638

handover decision 2: load balancing across BSS

Added by neels 2 months ago. Updated 2 months ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
Handover
Target version:
-
Start date:
10/09/2018
Due date:
% Done:

0%

Spec Reference:

Description

I have today implemented a first rudimentary decision tradeoff for inter-BSC HO: never do load balancing across BSS boundaries,
because that is asking for oscillation. So we do inter-BSC handover like in the handover decision algorithm 1:
only if the current lchan drops below the minimum required rxlev / max ta, and a remote-BSS has better rxlev.
(So far this is on branch osmo-bsc:neels/ho2-interbsc, needs some polishing and merge.)

In the long run, there are options for load balancing across BSS:

  • trigger inter-BSC HO, and the remote-BSS refuses to accept it if it feels too loaded.
    The handover algorithm penalty timers will then prevent asking the same remote-BSS too often.
  • the "Old BSS to New BSS Information" IE in the BSSMAP Handover Required:
    we can send some load indication along, and the target BSS could accept only if it is less loaded.

Related issues

Related to OsmoBSC - Feature #1608: various handover improvements, meta-issueRejected2016-02-23

Related to OsmoBSC - Feature #3486: handover decision: congestion: figure out the tradeoff: re-assign within same cell vs. handover to another cellNew2018-08-20

Related to OsmoBSC - Feature #1606: hand-over for load distribution among BTSsIn Progress2016-02-23

History

#1 Updated by neels 2 months ago

  • Related to Feature #1608: various handover improvements, meta-issue added

#2 Updated by neels 2 months ago

  • Related to Feature #3486: handover decision: congestion: figure out the tradeoff: re-assign within same cell vs. handover to another cell added

#3 Updated by neels 2 months ago

  • Priority changed from Normal to Low

#4 Updated by neels 2 months ago

  • Related to Feature #1606: hand-over for load distribution among BTSs added

#5 Updated by neels 2 months ago

(first ho2 inter-bsc support: https://gerrit.osmocom.org/11321 )

#6 Updated by neels 2 months ago

  • Category set to Handover

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