LTE (NSN Equipment) - RRC RE-ESTABLISHMENT REJECT (FAILURE CAUSES)

[anita_2k]

LTE NSN Version is 3.1
T310 and T304 timers are set to Max
2000ms ==> 6

Please help... everything are aligned, has high DL and UL throughput.
OSS perf and Drivetest verification, for reference

thanks
br/Anita

[MINTO]

Hi Anita,

I am not familiar with NSN, so can u check re-establishment because of HO failure is supported by NSN or not??

need to check why there is reestablishment request, kindly check below things

HO success message seen in log is not real HO success, kindly check Rach messages success and also have u received 1 more RRC Reconfiguration message ( with measurement info) after the handover or not???

also check PDU retransmission failure.

let me know what u got

[anita_2k]

Yes, RRC RE_ESTABLISHMENT is supported in our Network now.
No more RRC Reconfiguration message rather PRACH Start messages.
1 thing i noticed, because on the logfiles, i have 3 scenarios.

1st: RRC ReEstablishment Completed
PCI 49 to PCI 52
Handover Attempt then Success
RRC RE_ESTABLISHMENT Attempt then SUCCESS
RRC Reconfiguration then Complete
... Next Messages became idle already started to do RRC Connection Request again


2nd: RRC ReEstablishment Completed
PCI 49 to PCI 52
Handover Attempt then Success
RRC RE_ESTABLISHMENT Attempt then SUCCESS
RRC Reconfiguration then Complete
... Next Messages became , LTE TERMINAL RESELECT… LTE PAGING

3rd: RRC ReEstablishment REJECT
PCI 49 to PCI 52
Handover Attempt then Success (as seen on the L3 Msg, serving PCI became 52 before sending SIB messages)
RRC RE_ESTABLISHMENT Attempt then REJECT
NO MORE RECONFIGURATION rather have
... LTE Prach Start messages


Photos in chronological order 1st, 2nd and 3rd scenarios...

[kunnu]

Hi Anita,
What is the difference in mentioned 3 scenarios? For same scenarios you are getting reject or with different configuration.

[MINTO]

Hi Anita,

Thanks for messages, need to check these things.

need to check Re-establishment reason , plz check in L1 before Re-establishment message "LTE MAC Configuration message" , d u see any radio link failure.
also give me reason value in re-establishment message

also plz check re-esatblsiment request to PCI on all 3 occasion ( many vendors don't support Multi RRC re-establishment- it means only re-establishment request to source cell will be accepted )

Can u send the logfile???

[anita_2k]

sorry guys, again, very seldom to check the forum lately.
MINTO please check the cause. it is handover failure.
seriously? do you think it is not supported in our current setup? i mean the multi-rrc? how to know?
actually, we try to change the PCI first, and the area will be re-driven again.