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Feature #2583

SGsAP Interface for LTE/ePC CSFB Support

Added by laforge about 1 year ago. Updated 2 months ago.

Status:
In Progress
Priority:
High
Assignee:
Category:
-
Target version:
-
Start date:
10/19/2017
Due date:
% Done:

0%

Resolution:

Description

It would be great to support combined 2G+4G networks by having a SGsAP interface in our MSC/VLR.

This interface is used for circuit-switched fallback between the MME and the MSC/VLR.

It's not based on ASN.1 and also not using SIGTRAN. Rather' it's using GSM-style TLVs over plain SCTP. For a detailed specification, see 3GPP TS 29.118.

Let's use this ticket to document what it would take to add this to OsmoMSC.

For a high-level summary of how CSFB and SMS-over-SGs, see http://www.leliwa.com/downloads/CSFB_and_SMSoSGs.pdf


Subtasks

Feature #3613: SGsAP message encoding/decoding libraryIn Progresslaforge

Feature #3614: SGs integration tests in TTCN3Stalledlaforge

Feature #3615: SGs subscriber state machineIn Progressdexter


Related issues

Related to OsmoMSC - Feature #1599: Gs interface (BSSMAP+) between SGSN and MSC/VLRNew2016-02-23

Related to OsmoSGSN - Feature #1583: Gs interface (BSSMAP+) between SGSN and MSC/VLRNew2016-02-23

History

#1 Updated by laforge about 1 year ago

See also SGs_Interface

#2 Updated by laforge about 1 year ago

  • Related to Feature #1599: Gs interface (BSSMAP+) between SGSN and MSC/VLR added

#3 Updated by laforge about 1 year ago

  • Related to Feature #1583: Gs interface (BSSMAP+) between SGSN and MSC/VLR added

#4 Updated by laforge 3 months ago

#5 Updated by laforge 3 months ago

  • Priority changed from Low to High

#7 Updated by laforge 2 months ago

  • Status changed from New to In Progress

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