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bsc: handover: clarify default of all-cells-are-neighbors 

Change-Id: I61f877c7a60419132bdd27c1b4e64150c0520751
This commit is contained in:
Neels Hofmeyr 2018-10-31 02:18:39 +01:00
parent 8c14a942d2
commit 4875848853
1 changed files with 16 additions and 0 deletions
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doc/manuals/chapters/handover.adoc
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@ -166,6 +166,22 @@ new `neighbor` configuration described below.
| ✓ | ✓ | neighbor cgi 001 01 200 3 arfcn 123 bsic 1
|====
==== Default: All Local Cells are Neighbors
For historical reasons, the default behavior of OsmoBSC is to add all local-BSS cells as neighbors. To
maintain a backwards compatible configuration file format, this is still the case: as soon as no explicit
neighbor cell is configured with a `neighbor` command (either none was configured, or all configured
neighbors have been removed again), a cell automatically lists all of the local-BSS cells as neighbors.
These are implicit mappings in terms of the legacy neighbor configuration scheme, and re-using ARFCN+BSIC
combinations within a BSS will not work well this way.
As soon as the first explicit neighbor relation is added to a cell, the legacy behavior is switched off,
and only explicit neighbors are in effect.
NOTE: If a cell is required to not have any neighbors, it is recommended to rather switch off handover
for that cell with `handover 0`. An alternative solution is to set `neighbor-list mode manual` and not
configure any `neighbor-list` entries.
==== Local-BSS Neighbors
Local neighbors can be configured by just the local BTS number, or by LAC+CI,