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How to perform trouble shooting based on counters
1.
Company Confidential 1 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials How to perform trouble shooting based on counters • Pre-requisite: Capture ALL the measurement dumps (e.g., ServLev, CellRes, RRC, L3 signalling, etc) • Calculated each PI with the breakdown on the failure cause(s)
2.
Company Confidential 2 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC Connection Setup Phase • RRC Connection Setup Phase is from RRC Connection Request to RRC Connection Setup message • In the RRC Connection Setup Phase, there are 8 possible setup failure causes • For each failure cause, we can look into analyzing (or trouble shooting the Top-N cells) 8 failures causes
3.
Company Confidential 3 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 1. RRC_CONN_STP_FAIL_AC • For e.g, in the previous slide, we see that there were 1085 RRC Setup failure due to AC reason • Then we zoom into Top-N cells for further analysis. For instance, the worst cell is WBTS: 110B9WC, WCEL-3
4.
Company Confidential 4 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_STP_FAIL_AC • First check the alarm history is there any alarm happened to this site/cell on that day • Once confirmed there was alarm happened, you may skip to analyze this site/cell. This is because when alarm happened, no one can confirm it affects the way counter is triggered or not • Check any parameter(s) error. • Failure due to AC has to be further analyzed is because of UL or DL • Next, we look into Cell Resource table on this WCEL (i.e. 110B9WC-3) • For UL, then we will look into AVE_PRX_NOISE, MAX_PRX_NOISE_VALUE, MIN_PRX_NOISE_VALUE, and AVE_PRXTOT_CLASS_x, where x is from 0 to 4 (a sample will be presented in next slide) • For DL, then we will look into AVE_PTXTOTAL_CLASS_x where x is from 0 to 4
5.
Company Confidential 5 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials Prxtotal Performance • The Prxnoise look quite reasonable, i.e., no high noise. The max. & min. noise is also quite alright. So the failure is likely not in UL • Next, look at Ptxtotal (DL) performance Actual value=(value/100) then put a –ve sign??
6.
Company Confidential 6 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials Ptxtotal Performance • The sample in class 3 is quite high. Indicate there could be DL power issue (AC rejection due to DL) Some problem in term of value here??
7.
Company Confidential 7 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_STP_FAIL_AC • Next, check the M1002 (Traffic table) • Check M1002C1 DCH Request for Signalling Link Reject in UL (DCH_REQ_LINK_REJ_UL_SRNC) • Check M1002C2 DCH Request for Signalling Link Reject in DL (DCH_REQ_LINK_REJ_DL_SRNC) • From the traffic table, we can conclude that the AC reject is due to DL (proven that the “guessing” in previous slide is correct • Suggestion: Try to tune Ptxtarget to a high value (if there is still room to tune) and monitor the performance • Note: It could be BTS problem as well (like WSP, BTS s/w problem, etc). But this should be solved by the latest BTS s/w release.
8.
Company Confidential 8 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials Another Example on Failure Due To AC (UL Problem) Suspect it is due to UL Because there is Class_4 triggered Confirmed from Traffic measurement
9.
Company Confidential 9 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 2. RRC_CONN_STP_FAIL_BTS • The second failure cause for RRC Connection Setup is due to BTS reason • Check alarm history if there is any alarm happened to this site/cell on that day • Once confirmed there was alarm, you may skip to analyze this site/cell. This is because when alarm happened, no one can confirm it affects the way counter is triggered or not • Check L3 Iub counter (M1005) for the followings • M1005C10 RL Setup Fail for 1st RL due to O&M intervention (SETUP_FAIL_RL_O_M_INTERV) • M1005C11 RL Setup Fail for 1st RL due to already active (SETUP_FAIL_RL_ALREADY_ACTIV) • M1005C12 RL Setup Fail for 1st RL due to HW resource not available (SETUP_FAIL_FIRST_RL_HW_RES) • M1005C13 RL Setup Fail for 1st RL due to not enough resource (SETUP_FAIL_RL_NOT_ENOUGH_RES) • M1005C14 RL Setup Fail for 1st RL due to BTS not responding (SETUP_FAIL_RL_BTS_NOT_RESP) • M1005C15 RL Setup Fail for 1st RL due to BTS general reason (SETUP_FAIL_RL_BTS_GEN_REA) • Sometimes failure could be due to wrong configuration data in BTS. If still fail due to not enough resource (no alarm), then check configuration data • Check also pool capacity to determine any WSP bottleneck • If failed due to no respond from BTS and no alarm could be sleeping cell. Delete COCO & recreate it (or reset the site to see if helps)
10.
Company Confidential 10 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_STP_FAIL_BTS May need to check BTS alarm!!!
11.
Company Confidential 11 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 3. RRC_CONN_STP_FAIL_TRANS • Check BTS/AXC/Transmission alarm history • Check physical layer for ATM alarms and link “error seconds” • Normally happen to site with 2xE1 IMA links • Check parameters setting (esp. COCO, TRS related) vs. planned value • Could be due to TRS capacity bottle neck. Need to confirm will this trigger M1001C5 or C399? • Check UNI measurement (M548)?? • See next slide for parameter mismatched case
12.
Company Confidential 12 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_STP_FAIL_TRANS 2xE1 config here But 1xE1 setting in AAL2 UP
13.
Company Confidential 13 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 4. RRC_CONN_STP_FAIL_HC • Problem at initial link setup inside RNC handover program block (HA3) • Usually a data build issue, e.g. CellID (wcel does not exist) • This counter shouldn’t be triggered • Suggestion: Check RNC data build for failure cell
14.
Company Confidential 14 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 5. RRC_CONN_STP_FAIL_RNC • Check BTS & RNC alarm history • Difficult to trouble shoot as this is likely due to some RNC unit alarm • Could be due to parameter mismatch (what parameter???), timer expiry, L2 problem, etc
15.
Company Confidential 15 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 6. RRC_CONN_STP_FAIL_FROZBS • Check BTS alarm • Based on counter description, this counter seems only trigger when AC block call setup to ensure the setup of emergency calls • Never encounter this counter triggered yet. Likely to observe it when there is high load in the system AND also emergency calls initiated
16.
Company Confidential 16 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 7. RRC_CONN_STP_FAIL_RNTI_ALLO • Check RRMU loading • Check RNC alarm??? (any RRMU unit restart, etc??) • Never encounter this counter triggered yet
17.
Company Confidential 17 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 8. SPARE_1_SERVICELEVEL • This counter represents RRC Setup Fail due to Iub AAL2 Transmission reason • Never encountered this counter triggered yet. Why? Need to load the right OSS s/w & CD level?? • May have to cross check with M1001C5 RRC_CONN_STP_FAIL_TRANS (RRC Connection Setup Failure due to Transmission reason) to determine which counter is triggered • Check BTS/AXC/TRS alarm • Check AXC/TRS related parameter consistency (like the case in failure due to TRS reason)
18.
Company Confidential 18 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC Connection Access Phase • In RRC Connection Access Phase, there are 3 failures causes • M1001C9 RRC_CONN_ACC_FAIL_RADIO (RRC Connection Access Failure due to radio interface synchronization) • M1001C10 RRC_CONN_ACC_FAIL_MS (RRC Connection Access Failure due to Uu interface) • M1001C11 RRC_CONN_ACC_FAIL_RNC (RRC Acc Fail due to RNC Internal Reason)
19.
Company Confidential 19 ©
2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 1. RRC_CONN_ACC_FAIL_RADIO • Check RRC Access failure per establishment cause to determine whether failure is mainly due to inter-RAT cell reselection or registration, etc • If there is high attempts/failures on the inter-RAT cell reselection or registration, then likely to be coverage issue • May indicate the inter-RAT cell reselection parameter need to optimized in case high inter-RAT cell reselection attempts/failures Distribution for Establishment Cause 36% 17% 12% 8% 7% 3% 2% 2% 2% 2% 2% 1% 1% 1% 1% 1% 1% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% intr_rat_cell_re_select_c radio_interface_c registration_c radio_interface_c registration_c ms_c intr_rat_cell_re_select_c ms_c orig_conversational_call_c radio_interface_c orig_conversational_call_c ms_c orig_high_prior_signal_c radio_interface_c term_conversational_call_c radio_interface_c term_conversational_call_c ms_c term_low_prior_signal_c ms_c term_low_prior_signal_c radio_interface_c orig_low_prior_signal_c radio_interface_c orig_high_prior_signal_c ms_c orig_interactive_call_c ms_c orig_low_prior_signal_c ms_c orig_interactive_call_c radio_interface_c detach_c radio_interface_c call_re_establishment_c radio_interface_c term_interactive_call_c ms_c detach_c ms_c orig_background_call_c radio_interface_c term_interactive_call_c radio_interface_c call_re_establishment_c ms_c term_background_call_c radio_interface_c term_cause_unknown_c radio_interface_c orig_background_call_c ms_c Likely be coverage issue
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACC_FAIL_RADIO • Check any parameter inconsistent • Check Prxnoise, and Ptxtot performance • Probably can tune T312 to 6sec & N312=2 or 1 to see any performance improvement • Perform drive test to confirm any DL coverage problem. It could be due to UE not receiving RRC Connection Setup message (i.e., SCCPCH power not enough) -> Tune SCCPCH power if required • Failure could be UE model related. Reason: Some UE models perform badly when the RF performance is no good (e.g., when Ec/No < -11dB). Need to use Traffica/ICSU log to confirm UE model. This check is tedious and should be done only after all checks and the problem still occurring. • In some projects, it has noticed that Sony Ericsson Z1010 perform badly when RF is weak (similarly to other models on EMP – Ericsson Mobile Platform, eg. LG) – see next slide
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACC_FAIL_RADIO • Different UE performance vs. initial Ec/No Success Rate for Initial Synch in RRC Access : Nokia/LG 50.00 55.00 60.00 65.00 70.00 75.00 80.00 85.00 90.00 95.00 100.00 -25 -22 -20 -17 -15 -12 -9.5 -7 -4.5 -2 EcNo Success Rate % Nokia 6630, 6680 Nokia 7600 LG 8130, 8138, 8180, 8330 LG U8110, 8120
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 2. RRC_CONN_ACC_FAIL_MS • This failure should be much lesser than L1 synch problem • It is triggered when RNC received NBAP: Synchronization Indicator. BUT there is no RRC Connection Setup Complete received • Check any UL interference • It indicates there is some problem with UL coverage. Try to tune CPICH to have more balance between UL & DL coverage (if it is not UL interference) • Maybe due to BTS problem. Try to reset the WBTS to see problem still exist • May due to WSP problem (refer to John’s WBTS trouble shooting for 35003WC)
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 3. RRC_CONN_ACC_FAIL_RNC • Normally this counter does not have high triggers • If there is high failure due to RNC, pls check RNC alarm
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC Connection Active Phase • RRC Active Phase has 8 failure causes • M1001C15 – RRC Active Fail due to Iu Interface (RRC_CONN_ACT_FAIL_IU) • M1001C16 – RRC Active Fail due to Radio Interface (RRC_CONN_ACT_FAIL_RADIO) • M1001C17 – RRC Active Fail due to BTS Reasons (RRC_CONN_ACT_FAIL_BTS) • M1001C18 – RRC Active Fail due to Iur Interface (RRC_CONN_ACT_FAIL_IUR) • M1001C19 – RRC Active Fail due to Ciphering Fail (RRC_CONN_ACT_FAIL_CIPH) • M1001C20 – RRC Active Fail due to Integrity Check (RRC_CONN_ACT_FAIL_I_CHK) • M1001C21 – RRC Active Fail due to RNC Internal Reasons (RRC_CONN_ACT_FAIL_RNC) • M1001C391 – RRC Active Fail due to UE (RRC_CONN_ACT_FAIL_UE) • Majority of the failures seem to be: • RNC Internal • Iu • Radio • UE
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC Connection Active Phase Majority of failures This counter is not triggered Correctly in RN2 GCD1.0
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACT_FAIL_IU • Generally is signaling connection fails between the RNC and CN • Next to check RNC & CN alarm. In case the problem happen consecutively for many days (eg. 4 to 5 days) and the same cells. Then some ICSU logs need to take on the particular WBTS/WCEL to find out the root cause • Wrong parameter setting in MSC (INFO IN SCCP C-REF MESSAGE SUPPORTED was enable), this counter was incremented during the detach procedure nevertheless the detach was successfully - Need confirmation???
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACT_FAIL_RADIO • In general, this is due to “radio link failure” because of loss of L1 synchronization • Need to check coverage • This is the top 1 failure in most of the network • Possible cause could also be due to some UE not responding to Radio Bearer Reconfiguration message from RNC • Check the Radio Bearer Reconfiguration Success Rate from RRC (M1006) table: 100*(RB_RECONF_COMPLETE/RB_RECONF). If the success rate is very low, this is very likely due to UE not responding to RB Reconfiguration message. It could be either UE problem or coverage issue • CPICHToRefRABOffset is 0dB (new default) which give 2dB more power than the old default value. Hopefully this can provide more power to sustain a call in poor coverage area • If the problem continuously happen to a WBTS/WCEL for many days. Perform a drive test to check any coverage issue. Else, ICSU log need to be taken and analyze the PMI ticket to see the high failure cause
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACT_FAIL_RNC • Check RNC alarm • Typically this is due to some timer expired in RNC • Check is the failure also happen to WBTS/WCEL near to RNC border • For e.g., SRNC relocation failure may result in this counter incremented (t_reloc_prep timer expired) • It may be due to some timer value set too small in RNC. For e.g., Iu-PS signaling cell delay variation time • Check L3 SRNC relocation counter??? (additional information need to be added here. Will be added in future!!!)
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACT_FAIL_BTS • Normally this is failed due to BTS alarm • So far this cause is not the majority
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACT_FAIL_Iur • No idea for trouble shooting yet • Could be related to inter-RNC SHO or SRNC relocation or anchoring problem
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACT_FAIL_I_CHK • No failure yet • If failure occurred, likely to be some system or UE issue?? • Integrity check is not RF issue
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACT_FAIL_CIPH • No failure yet • If failure occurred, then likely to by system or UE issue • Ciphering is not RF issue
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2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials RRC_CONN_ACT_FAIL_UE • This counter is not trigger correctly in RAN04 GCD1.0 • GCD2.0 or 2.1 will have correction • Currently this is due to no response of RRC message from UE • But Cell FACH <-> Cell DCH transition will also cause this counter to be updated -> causing inaccuracy