-
Member
Reputation: 22
Many RRC Connection Reestablishment Reject
Hi Expert,
In our network, we have a lot of RRC Connection Reestablishment Reject message reassigned from the ENB imediatly after receiving RRC Connection Reestablishment request message.
Vendor : NSN
Note that not all the reestablishement messages are rejected.
Please help to root cause and give us your recommendations. What could be the reasons ?
Best regards
-
2016-05-11 08:12 AM
# ADS
Circuit advertisement
-
Member
Reputation: 69
Re: Many RRC Connection Reestablishment Reject
Check if RLF Handover feature is enabled. Otherwise, when a UE drops the connection while doing a handover from Cell A to Cell B, and for some reason reestablishes at Cell C, the reestablishment will be rejected by Cell C. It will only work if done at either Cell A or Cell B.
With the feature, you will solve this issue.
-
Senior Member
Reputation: 360
Re: Many RRC Connection Reestablishment Reject
have you DT log result? if you have could you send it? probably it will easier to check the root cause.
Best people are those who are useful to others
-
Member
Reputation: 22
Re: Many RRC Connection Reestablishment Reject
Hi,
Many thanks for your replays. Find attached Emil trace.
@ marcengo : I checked the feature, It not activated in our network. But In the majority of the cases, UE not droped the connection while doing a handover.
Please advise.
RRC_reject.jpg
-
Re: Many RRC Connection Reestablishment Reject
I have the same situation, but in ourcase RLF triggered HO is active. RRC Reestablishment success rate is only 50%.
Most failures are due to T301 expiry, we set this to default at 400ms.
Does anybody experience the same situation we face here?
Originally Posted by
BENRHOUMASALEM
Hi,
Many thanks for your replays. Find attached Emil trace.
@ marcengo : I checked the feature, It not activated in our network. But In the majority of the cases,
UE not droped the connection while doing a handover.
Please advise.
RRC_reject.jpg
-
Member
Reputation: 33
Re: Many RRC Connection Reestablishment Reject
start by checking your admission control params ,may be you have congestion there
also to verify you PUCCH parameters
than it's better to check also MSG4 reception
try to enlarge "T301" param and see the impact
BR
-
Member
Reputation: 22
Re: Many RRC Connection Reestablishment Reject
Hi yassanino,
What's the relation between this cause of failure and T301 ? As you see in the screen shot, the Rejection is sended directly after RRC restab request. So no problem in T301!
@Expert lease to send your recommendations
-
Member
Reputation: 59
Re: Many RRC Connection Reestablishment Reject
It seems to Radio condition problem. If you do re-establishment but while doing so your RF sync it out due to RF condition, they will fail.
In Emil i believe you can see the RF status. Check what is the RF condition when they are doing this re-establishment.
Originally Posted by
BENRHOUMASALEM
Hi,
Many thanks for your replays. Find attached Emil trace.
@ marcengo : I checked the feature, It not activated in our network. But In the majority of the cases,
UE not droped the connection while doing a handover.
Please advise.
RRC_reject.jpg
-
Member
Reputation: 28
Re: Many RRC Connection Reestablishment Reject
Hi All,
In nokia equipment if you have RL60 or before software version you will have this issue. In RL70 the issue is solved usin feature. The problem is after Successful HO IF RLF occur the Ue can send request to any eNB it is not necessory that re-establishment is request from same target eNodeB. As other eNB dont have valid Ue context so they reject the re-establishment request considering it to be invalid request. In RL70 they introduced a feature that any eNodeB can query UE context from target eNB for Re-establishment on X2 interface if it exist.
Originally Posted by
BENRHOUMASALEM
Hi Expert,
In our network, we have a lot of RRC Connection Reestablishment Reject message reassigned from the ENB imediatly after receiving RRC Connection Reestablishment request message.
Vendor : NSN
Note that not all the reestablishement messages are rejected.
Please help to root cause and give us your recommendations. What could be the reasons ?
Best regards
-
Post Thanks - 1 Thanks
-
Member
Reputation: 22
Re: Many RRC Connection Reestablishment Reject
Yes. We tried this sollution but normally the load in X2 will be very high if we do a generalization
Bookmarks