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Bug #1818

open

IuPS: CN should Iu Release in certain situations

Added by neels over 7 years ago. Updated about 4 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
Iu interface
Target version:
-
Start date:
10/12/2016
Due date:
% Done:

0%

Spec Reference:
Tags:
3G

Description

I observe sporadic data service failure which is solved by reconnecting the UE.

The situation looks like this:

The UE keeps sending GMM Attach Requests and the SGSN keeps answering with GMM Attach
Accepts (more often than it receives Attach Requests even), but the process never
goes on after that. I notice the lack of Iu Releases.

When I put the phone in flight mode and back online, an Iu Release (and complete UE DE-REGISTER)
is done, and after that 3G data service works immediately and well.

The SGSN never sends and Iu Release on own accord nor invalidates the UE conn unless the
UE asks for an Iu Release.

There should be timeouts and the SGSN should do an Iu Release on a given conn at some
point. The UE will then re-connect with another InitialUE message and hopefully fix things.

There is possibly another hidden root cause for this situation, but this issue calls
for sane Iu Release timeouts by the SGSN.


Files

iups_sporadic_failure.pcapng iups_sporadic_failure.pcapng 179 KB pcap filtered 'sctp || gtp', obtained with nano3G, In the middle there loading xkcd.com worked, numerous other attemps resulted in "This web page is not available" neels, 01/23/2017 01:27 PM

Related issues

Related to OsmoSGSN - Bug #1977: 3G IuPS is unreliableClosedlynxis03/09/2017

Actions
Related to OsmoSGSN - Bug #3302: implement a FSM for GMM Attach RequestClosedlynxis05/29/2018

Actions
Related to OsmoSGSN - Bug #3908: "PS Activation" takes long time - missing Iu-Release Command after Attach CompleteResolvedlaforge04/07/2019

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