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    WI - RRC CS Failure Rate

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    fidele
    This document provides steps to troubleshoot high RRC circuit switched (CS) failure rates in a wireless network. The steps include: 1. Checking alarms, hardware, overshooting, and RSSI. 2. Examining counters related to CS call denials and RRC connection setup failures. 3. Enabling admission control hardware policies and checking CS RRC setup failure reasons.

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    WI - RRC CS Failure Rate

    Uploaded by

    fidele
    122 views3 pages
    This document provides steps to troubleshoot high RRC circuit switched (CS) failure rates in a wireless network. The steps include: 1. Checking alarms, hardware, overshooting, and RSSI. 2. Examining counters related to CS call denials and RRC connection setup failures. 3. Enabling admission control hardware policies and checking CS RRC setup failure reasons.

    Original Description:

    Hi, useful doc about troublshooting of high RRC CS failure rate enjoy

    Original Title

    WI_RRC CS Failure Rate

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    This document provides steps to troubleshoot high RRC circuit switched (CS) failure rates in a wireless network. The steps include: 1. Checking alarms, hardware, overshooting, and RSSI. 2. Examining counters related to CS call denials and RRC connection setup failures. 3. Enabling admission control hardware policies and checking CS RRC setup failure reasons.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    122 views3 pages

    WI - RRC CS Failure Rate

    Uploaded by

    fidele
    This document provides steps to troubleshoot high RRC circuit switched (CS) failure rates in a wireless network. The steps include: 1. Checking alarms, hardware, overshooting, and RSSI. 2. Examining counters related to CS call denials and RRC connection setup failures. 3. Enabling admission control hardware policies and checking CS RRC setup failure reasons.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    of 3

    WI – RRC_CS_Failure Rate (%)

    1. Alarms Checks

    2. Hardware Checks

    3. Overshooting Checks

    4. RSSI Checks

    5. Check the Counters :

     pmNoRrcCsReqDeniedAdm

     pmNoRrcConnReqBlockTnCs

     pmNoRrcConnReqBlockNodeCs

     pmNoFailedRrcConnectReqCsHw

     pmNoRrcCsReqDeniedAdm : indicates CS calls denied by admission control.

     pmNoRrcConnReqBlockTnCs : indicates number of RRC Connection Setup attempts for Circuit Switched

    calls that fail due to Transport Network blocking.

     pmNoRrcConnReqBlockNodeCs : indicates number of RRC Connection Setup attempts


    for Circuit Switched calls that fail due to node blocking.

     pmNoFailedRrcConnectReqCsHw : indicates number of CS calls denied by admission control due to


    insufficient licensed capacity in the RBS
    6. Check and Enable Admission Hardware Policy (dlHwAdm & ulHwAdm ). Values should be less than 100

    7. Check CS RRC Setup Failures reasons :

    These failures are mainly associated with RRC rejections due to MP load Node‐B / Transport network congestion or
    configuration errors, Cell Congestion (Admission Control) and insufficient licensed capacity.

    8. Check CS RRC Access (Radio reasons) Failures :

    These failures are mainly due to radio reasons.By subtracting RRC setup failures from Total RRC access failures,

    we can get the numbers for RRC access failures due to radio reasons.

    9. Check RRC Setup Failures due to different resources :

     due to lack of ULHW(DeniedAdmUlHw) or lack of DLHW(DeniedAdmDlHw) ==> Recommended to perform CE Upgrades

     due to lack of DL Power(DeniedAdmDlPwr) ==> Recommended to increase pwrAdm & pwrOffset parameter)

     due to lack of DL Code (DeniedAdmDlChnlCode) ==> Recommended to increase dlcodeAdm

    10. Check the counter (i.e pmNoofNonHoReqDeniedSpeech) and accordingly activate Directed Retry to GSM,thereby relieves
    radio resources in WCDMA by moving voice traffic to GSM for the worst effected cells. The parameters used to tune are
    loadSharingGsmThreshold & loadSharingGSMFraction
    11. Check RRC Setup failure due to Abnormal Reasons :

    - Software/Hardware Issues -

     Can be caused by antenna systems

     Can be caused by mis-configuration issues

     Can be caused by RBS Transport equipment

     Can be caused by Core Network or even the UE

    - Specific UE Issues : Degrade due to specific phones ,with signaling problems with the networks

    Can be concluded by CTR and RNC Traces

    - Cell Availability : Check the cells with "DISABLED" State and do the necessary corrections( Restart the Node ,etc)

    12. Check the RNCs MP Load/Dc Load ,to ensure that the RNC has not reached the Max MP Load , affecting RRC CS.

    13. Check if any activities in any of the NEs( Core ,MediaGateway) in the Network has affected the RRC CS .

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