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Bug #4037

LAPDm N200 values are incorrect

Added by laforge 23 days ago. Updated 12 days ago.

Status:
Resolved
Priority:
High
Assignee:
Category:
-
Target version:
-
Start date:
06/02/2019
Due date:
% Done:

100%

Spec Reference:

Description

As per GSM TS 04.60 the N200 re-transmission counter value depends on the channel type (TCH/F vs TCH/H vs SDCCH). OsmoBTS (with libosmocore lapdm code as basis) instead uses one fixed value all the time.


Related issues

Related to OsmoBTS - Feature #3906: Automatically adjust LAPDm timer values with 'fn-advance' parameterResolved04/06/2019

Related to OsmoBTS - Bug #2294: T200 values set by OML (TS 12.21) are ignoredResolved05/27/2017

History

#1 Updated by laforge 23 days ago

  • % Done changed from 0 to 80

https://gerrit.osmocom.org/c/libosmocore/+/14339 implements the libosmocore lapdm capabilities and the osmo-bts part is in https://gerrit.osmocom.org/c/osmo-bts/+/14340

#2 Updated by laforge 23 days ago

  • Related to Feature #3906: Automatically adjust LAPDm timer values with 'fn-advance' parameter added

#3 Updated by laforge 23 days ago

  • Related to Bug #2294: T200 values set by OML (TS 12.21) are ignored added

#4 Updated by laforge 23 days ago

  • % Done changed from 80 to 90

See also https://gerrit.osmocom.org/c/libosmocore/+/14347 for an off-by-one in lapd_core regarding N200.

#5 Updated by laforge 12 days ago

  • Status changed from In Progress to Resolved
  • % Done changed from 90 to 100

patch merged

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