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Bug #4954

Fix routing of RADIO-STATUS by TMSI

Added by laforge about 1 month ago. Updated about 1 month ago.

Status:
Resolved
Priority:
High
Assignee:
Target version:
-
Start date:
01/17/2021
Due date:
% Done:

100%

Spec Reference:

Description

While development of test cases (specifically TC_radio_status_tmsi) it has shown that routing the uplink RADIO-STATUS by TMSI is broken. osmo-gbproxy consistently selects a "wrong" SGSN.

The expectation is that we treat the TMSI identical to a TLLI and extract the NRI value from that. However, that somehow fails as the TMSI upper bits are not well-defined and could indicate an unexpected TLLI type. In my examples, it's tMSI_Value := '42180023'O, whihc contains NRI=3 and hence is expected to end up on SGSN0. However, it gets routed to SGSN1 in all test invocations.


Related issues

Related to osmo-gbproxy - Feature #4472: Intra-domain connection of OsmoGBPROXY to multiple SGSNs (pooling)In Progress03/29/2020

Associated revisions

Revision cd21afed (diff)
Added by daniel about 1 month ago

gbproxy: Improve log messages in gbproxy_select_sgsn

Change-Id: Id7bc755b90c35ed7c8cfa8408073e2866d639f2d
Related: OS#4954

Revision 8b3ed29c (diff)
Added by daniel about 1 month ago

gbproxy: Fix radio status routing by TMSI

If a radio status message contains a TMSI it should be routed as if it
was a TLLI. Convert the TMSI to (foreign) TLLI so NRI-routing works.

Both foreign and local TLLIs are routed the same.

Fixes: OS#4954
Change-Id: Ifd64f02fa16b44f8e2e19eb8ba973f50a829ead5

History

#2 Updated by daniel about 1 month ago

  • Status changed from New to In Progress

#3 Updated by daniel about 1 month ago

  • Status changed from In Progress to Feedback
  • % Done changed from 0 to 90

#4 Updated by daniel about 1 month ago

  • Status changed from Feedback to Resolved
  • % Done changed from 90 to 100

#5 Updated by daniel about 1 month ago

  • Related to Feature #4472: Intra-domain connection of OsmoGBPROXY to multiple SGSNs (pooling) added

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