RRC Release before Attach complete

[pongpang]

Hi Expert,

I found a bit strange from below picture, Why nw send "RRC Release" message before Attach complete??
and Actix count its to "Attach fail" (Aborted) event, Its occurred about 10 times/cluster.
Does anyone can explain or some suggestion??

Thanks
PongpanG
rrc attach.jpg

[scorpion]

Check the traces at SGSN side for the authentication procedures.....

But how comes there is a Attach Accept +Complete ?

[agenov]

What is the reason for RRC connection release?

Hi Expert,

I found a bit strange from below picture, Why nw send "RRC Release" message before Attach complete??
and Actix count its to "Attach fail" (Aborted) event, Its occurred about 10 times/cluster.
Does anyone can explain or some suggestion??

Thanks
PongpanG
rrc attach.jpg

[pongpang]

@Scorpion: for Attach accept+Attach complete, Is it normal??
@agenov: releaseCause: 0 ( normalEvent)

thanks,

[scorpion]

pongpang,

Just for analysis I will forget about that RRC-Release you have observed, I agree it is an important KPI from Radio perspective..but
From Core point of view..the procedure looks normal...have you initiated a PDP post that what happens then ?

[agenov]

Have you tried to open the log file in the software u use to do measurements nemo,tems etc and see there how it looks like. To me it seems like actix issue.

br

[pongpang]

@Scorpion : Umm. Its not effect to user and can going to do PDP procedure , im just a bit wondering.
@agenov : I already tried to playback by TEMS, its same as actix

thanks,

[babak1349]

Hello,
Are you sure Actix is showing the order of messages correctly ? Based on shown image, the attach process has been completed. Can yuo check the time stamp in TEMS and see if the order of messages is ok I meant RRC Release comes BEFORE Attach Accept.
Anyway RRC carries NAS messages and if Attach Accept/ Attach complete come after RRC release, it wouldn't make any sense Because there is no RRC conection to carry NAS massages

So I think it would be TEMS or Actix failure in decoding the messages in proper order.


Best Regards

Hi Expert,

I found a bit strange from below picture, Why nw send "RRC Release" message before Attach complete??
and Actix count its to "Attach fail" (Aborted) event, Its occurred about 10 times/cluster.
Does anyone can explain or some suggestion??

Thanks
PongpanG
rrc attach.jpg

[babak1349]

Further Suggestion,
It is better to check SGSN counters in order to see the Attach failure causes If the attach failure rate is higher than 5% you should see the reasons and take further actions For example running traces in SGSN in order to collect the causes

Best Regards

Hi Expert,

I found a bit strange from below picture, Why nw send "RRC Release" message before Attach complete??
and Actix count its to "Attach fail" (Aborted) event, Its occurred about 10 times/cluster.
Does anyone can explain or some suggestion??

Thanks
PongpanG
rrc attach.jpg

[pongpang]

Hi babak1349
I thinks so,maybe TEMS or Actic falut..
my nw didnt on commercial launch, we cant get any statistics to monitor.

more question,
-can we check from RNC trace message(UE trace, ISO trace etc..)??
-can we get the "USIM class(class1-15)" from DT logfile or RNC trace message, if can which message??? (not relate the topic)

Thanks and sorry about grammar ,