HSDPA/AMR Rab Fail

[dah.]

Hi all, what is the cause of high Rab Fail du to Radio Netowrk layer Failure(RNL) and TNL(Tranport Network Layer). BR

[magno22]

RNL-Check interference/UL and DL power congestion, RTWP/. Also affecting coverage.
TNL-Check Iub interface

[rfsupp]

RNL - Congestion for all resources(power,code, ce and IuB) from NodeB, failures at the Uu, CPU overload(Nodeb)
TNL - Usually means problem at the CN or problems at the Iu-CS/Iu-PS (due to high GBR e etc)

Hardly ever (I never saw) the fail at RAB.TNL is caused by IuB, should be to notice at the RRC.TNL.

[dah.]

hello,

i m always working on this problem of TNL Rab Fail. i found an other counter related to Iu Interface (RAB.FailEstabPSNoQueuing.IUEstabFail ) which is very High.
did you know what is mean this counter.

[agenov]

Completely agreed with rfsupp. RAB TNL failure means an issue over IuPS interface /can not setup IuPS bearer for some reason/ and not only congestion but any kind i.e incorrect configuration, some maintanance issue etc. Just check there for alarms, do trace if necesserarily to track down into more details the problem or/and escalate it to Huawei.

BR
Alex


RNL - Congestion for all resources(power,code, ce and IuB) from NodeB, failures at the Uu, CPU overload(Nodeb)
TNL - Usually means problem at the CN or problems at the Iu-CS/Iu-PS (due to high GBR e etc)

Hardly ever (I never saw) the fail at RAB.TNL is caused by IuB, should be to notice at the RRC.TNL.