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Feature #3613

Feature #2583: SGsAP Interface for LTE/ePC CSFB Support

SGsAP message encoding/decoding library

Added by laforge 20 days ago. Updated 12 days ago.

Status:
In Progress
Priority:
High
Assignee:
Category:
SGs Interface
Target version:
-
Start date:
10/02/2018
Due date:
% Done:

30%

Resolution:

Description

We need to develop a library for encoding/decoding of SGsAP protocol messages as per 3GPP TS 29.118 Section 8.

We can create unit tests using data encoded using the TITAN SGsAP encoder.

History

#1 Updated by laforge 20 days ago

  • Priority changed from Normal to High

#3 Updated by laforge 12 days ago

  • Status changed from New to In Progress
  • Assignee set to laforge
  • % Done changed from 0 to 30

Initial work for parsing/encoding SGsAP using the osmocom tlv parser as well as enums, value_strings, etc is in the laforge/sgsap branch of libosmocore.git, see http://git.osmocom.org/libosmocore/log/?h=laforge/sgsap, particularly
http://git.osmocom.org/libosmocore/commit/?h=laforge/sgsap&id=347a084fc4e03aecab4508bc34838989c80cf24e

#4 Updated by laforge 12 days ago

similarly, initial code for the osmo-msc side is at http://git.osmocom.org/osmo-msc/log/?h=laforge/sgsap

The completely untested code contains:
  • data structures for SGs connection, SGs MME, SGs per-UE context
  • FSM for managing the VLR reset procedure to a given MME
  • SGs server over SCTP using libosmo-netif, listening for MME connections
  • per-UE FSM described in 3GPP spec
  • message encoding/decoding helper functions
  • VTY for configuring SGs interface related settings (ip/port, timers, vlr name, ...)

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