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Support #4056

verify that legacy handover configuration still works after introduction of inter-BSC HO support

Added by neels 13 days ago. Updated 13 days ago.

Status:
New
Priority:
Normal
Assignee:
Category:
-
Target version:
-
Start date:
06/12/2019
Due date:
% Done:

0%

Spec Reference:

Description

The legacy handover configuration is that all ARFCNs used by any BTS are indicated as neighbor ARFCNs for all cells.
The OsmoBSC manual claims that this still works as long as no new-style 'neighbor' config is present in the .cfg file.
Indeed, generate_bcch_chan_list() in osmo-bsc/src/osmo-bsc/system_information.c adds all cells' ARFCNs to the neighbors list that is advertised to BTS,MS.

With a test, verify that an actual handover procedure indeed picks up such an implicit target cell.
Not only that the ARFCN gets listed in SI2 as neighbor, but also that if a handover decision kicks in, such an implicit neighbor cell is found as a target in handover_start(), and the handover procedure indeed is followed through.
(If it doesn't work, handover_start() would complain with "neighbor unknown")

History

#1 Updated by neels 13 days ago

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