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Feature #3682

Intra-domain connection of OsmoBSC to multiple MSCs

Added by laforge about 1 year ago. Updated 3 months ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
A interface
Target version:
-
Start date:
11/06/2018
Due date:
% Done:

0%

Spec Reference:

Description

3GPP TS 23.236 specifies the "Intra-domain connection of
Radio Access Network (RAN nodes to multiple Core Network (CN) nodes".

This introduces two concepts:
  • a deviation from the strict hierarchy of classic GSM architecture where a BSC is always only served by one MSC
  • the introduction of "MSC pools" where a pool of multiple MSCs cover one geographic service area.

This appears to be functioning by dividing the TMSI range between different MSCs, using the higher-order TMSI bits to identify the MSC and the lower-order TMSI bits for the actual TMSI within that MSC.

Section 5.3 describes the functions required to be implemented in the BSC.

142217065-MSC-Pool.pdf View 142217065-MSC-Pool.pdf 605 KB description of MSC pool feature laforge, 09/04/2019 09:01 AM

Checklist

  • splitting of TMSI allocation range/spce
  • storing of Global-CN-ID when receiving paging from MSC; routing paging response to that Global-CN-ID
  • VTY configuration of number of TMSI bits reserved for NRI
  • VTY configuration of NRI <-> MSC SCCP address mappings

History

#1 Updated by laforge 10 months ago

#2 Updated by laforge 3 months ago

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