7/28/2019 Can Any One Please Guide How to Reduce RRC Establishment Failures Due to No Reply

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Can any one please guide how to reduce RRC Establishment Failures due to No Reply.. Any Parameter

setting that can help to resolve the issue, please do let me know or share any document. Thanks.

Aumpika VitchayapitikulFailures due to Uu No Reply possible cause from both DL andUL path. For DL, possible poor DL coverage,insufficient FACH power or FACH

congestion ,so the "RRC connection setup"message couldn't reach the UE. For

UL,possible cause from DL/ULimbalance, poor UL coverage ,high RTWP orunsuccessful L1 synchonization. In this case,UE doesnt send "RRC Connection Setup

Completed" to RNC or the message doesnt reach the RNC.

To solve the issue,you can optimize cell coverage,cell reselection parameters(e.gTreselection,sintrasearch,sintersearch,qQualmin,Qrxlevmin),T300/N300,FACH

power/capacity or process timer e.g wait timer during RRC setup process.

Umar PervaizAumpika Vitchayapitikul .. Thanks for the Help..Suitable Parameter in our

Network case is changing T300/N300 (UE Idle Mode Timers)..

what if High UL Bler causing drop call? Any idea.?

Aumpika VitchayapitikulHigh UL BLER related to RF e.g coverage(link

imbalance,poor) RTWP,high load. Also need to check & optimise power control(ensure

enough UL power), channel switching (DCCC) ,Load control setting( Trigger lower bit

rate when poor radio condition or high uplink load or even can trigger IRAT Ho based onUE Tx power) and also ensure fast enough handover.

I have question about FACH :

1. FACH carry many user in small packet. How to separate service in each UE ?

Aumpika Vitchayapitikulwhen UE in connected mode,RNC will assign U-RNTI(UTRAN RadioNetwork Temporary ID) to each UE after setup RRC that how RNC can differentate the users.

Each UE will have their Radio Bearers(RB) which map to DCH or FACH on transport layer.FACH wii br mapped to S-CCPCH on physical layer which shared between PCH and FACH.

FACH can be used to send SMS,carry small packet during Cell_FACH state and use as

signalling during RRC connection setup procedure,FACH congestion will impact all these usageand

Patt Cha FACH have algorithm to manage traffics ?

Andy Anupong For small data or SMS you could send on Cell_FACH rather than Cell_DCH. As

P'Ice said, PCH and FACH sharing the same physical layer, that's why it may impact on pagingif FACH congested

Patt Cha I'm mean when FACH congest what happen in small data are queuing packet/reduce bit

rate/timer/reject UE.

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7/28/2019 Can Any One Please Guide How to Reduce RRC Establishment Failures Due to No Reply

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Aumpika VitchayapitikulSmall data can sending on Cell_DCH state when FACH congestion.

RRC connection that setup on FACH will be rejected. SMS will be delay but SMS can kept at

SMSC for certain period and re-sending.

Fullerton Andriano hi, does huawei only provide cong.times as counters for fach and pch?

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