diff --git a/doc/manuals/chapters/handover.adoc b/doc/manuals/chapters/handover.adoc index 11206908b..b76370100 100644 --- a/doc/manuals/chapters/handover.adoc +++ b/doc/manuals/chapters/handover.adoc @@ -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,