Airscale vs fALU Data and Volte
Retainability KPI
1
Confidential
© Nokia 2017
LTE Data Retainability Excluding Double S1 %
2
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
FSM Counter Name based formula
Data_Retainability
_Counters
((ERAB_REL_ENB_RNL_INA + ERAB_REL_ENB_RNL_RED + EPC_EPS_BEARER_REL_REQ_NORM +
EPC_EPS_BEARER_REL_REQ_DETACH+ERAB_REL_SUCC_HO_UTRAN + ERAB_REL_SUCC_HO_GERAN) (ERAB_REL_ENB_RNL_INA_QCI1 + ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_N_QCI1 +
EPC_EPS_BEAR_REL_REQ_D_QCI1+ERAB_REL_SUCC_HO_UTRAN_QCI1 + ERAB_REL_SUCC_HO_GERAN_QCI1) ) /
((ERAB_REL_ENB_RNL_INA + ERAB_REL_ENB_RNL_RED + EPC_EPS_BEARER_REL_REQ_NORM +
EPC_EPS_BEARER_REL_REQ_DETACH+ERAB_REL_SUCC_HO_UTRAN + ERAB_REL_SUCC_HO_GERAN) (ERAB_REL_ENB_RNL_INA_QCI1 + ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_N_QCI1 +
EPC_EPS_BEAR_REL_REQ_D_QCI1+ERAB_REL_SUCC_HO_UTRAN_QCI1 + ERAB_REL_SUCC_HO_GERAN_QCI1) +
(ERAB_REL_HO_PART + ERAB_REL_ENB - ERAB_REL_ENB_RNL_INA - ERAB_REL_ENB_RNL_RED +
EPC_EPS_BEARER_REL_REQ_RNL + EPC_EPS_BEARER_REL_REQ_OTH + ERAB_REL_EPC_PATH_SWITCH) (ERAB_REL_HO_PART_QCI1 + ERAB_REL_ENB_QCI1- ERAB_REL_ENB_RNL_INA_QCI1 - ERAB_REL_ENB_RNL_RED_QCI1 +
EPC_EPS_BEAR_REL_REQ_R_QCI1 + EPC_EPS_BEAR_REL_REQ_O_QCI1 + ERAB_REL_EPC_PATH_SWITCH_QCI1) (ERAB_REL_DOUBLE_S1 - ERAB_REL_DOUBLE_S1_QCI1) )
FSM Counter ID based formula
3
((M8006C255 + M8006C258 + M8006C6 + M8006C7 + M8006C303 + M8006C306) - (M8006C267 + M8006C270 + M8006C89 +
M8006C98 + M8006C304 + M8006C307))
/
((M8006C255 + M8006C258 + M8006C6 + M8006C7 + M8006C303 + M8006C306) - (M8006C267 + M8006C270 + M8006C89 +
M8006C98 + M8006C304 + M8006C307) + (M8006C261 + M8006C254 - M8006C255 - M8006C258 +M8006C8 + M8006C9 +
M8006C277) - (M8006C273 + M8006C266 - M8006C267 - M8006C270 + M8006C107 + M8006C116 + M8006C278) - (M8006C314 M8006C315) )
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
LTE DATA RET FL17 (without PS DS1) = Normal release / Normal release + Abnormal release
((ERAB_REL_ENB_RNL_INA + ERAB_REL_ENB_RNL_RED + EPC_EPS_BEARER_REL_REQ_NORM +
EPC_EPS_BEARER_REL_REQ_DETACH+ERAB_REL_SUCC_HO_UTRAN + ERAB_REL_SUCC_HO_GERAN) (ERAB_REL_ENB_RNL_INA_QCI1 + ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_N_QCI1 +
EPC_EPS_BEAR_REL_REQ_D_QCI1+ERAB_REL_SUCC_HO_UTRAN_QCI1 + ERAB_REL_SUCC_HO_GERAN_QCI1) )
= Normal release for all QCI
– Normal release for QCI1
/
((ERAB_REL_ENB_RNL_INA + ERAB_REL_ENB_RNL_RED + EPC_EPS_BEARER_REL_REQ_NORM +
EPC_EPS_BEARER_REL_REQ_DETACH+ERAB_REL_SUCC_HO_UTRAN + ERAB_REL_SUCC_HO_GERAN) (ERAB_REL_ENB_RNL_INA_QCI1 + ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_N_QCI1 +
EPC_EPS_BEAR_REL_REQ_D_QCI1+ERAB_REL_SUCC_HO_UTRAN_QCI1 + ERAB_REL_SUCC_HO_GERAN_QCI1) +
(ERAB_REL_HO_PART + ERAB_REL_ENB - ERAB_REL_ENB_RNL_INA - ERAB_REL_ENB_RNL_RED +
EPC_EPS_BEARER_REL_REQ_RNL + EPC_EPS_BEARER_REL_REQ_OTH + ERAB_REL_EPC_PATH_SWITCH) (ERAB_REL_HO_PART_QCI1 + ERAB_REL_ENB_QCI1- ERAB_REL_ENB_RNL_INA_QCI1 ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_R_QCI1 + EPC_EPS_BEAR_REL_REQ_O_QCI1 +
ERAB_REL_EPC_PATH_SWITCH_QCI1) –
(ERAB_REL_DOUBLE_S1 - ERAB_REL_DOUBLE_S1_QCI1) )
4
Confidential
© Nokia 2017
Double S1 removed
= Normal release for all QCI
– Normal release for QCI1
= Abnormal release for all
QCI – Abrormal release for
QCI1
= Remove Double S1 : (DS1
all QCI – DS1 CQI1)
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release 1
Data_Retainability
_Counters
M8006C261(ERAB_REL_HO_PART)
Abnormal Release 2
M8006C266(ERAB_REL_ENB) - M8006C267(ERAB_REL_ENB_RNL_INA) - M8006C270(ERAB_REL_ENB_RNL_RED)
=
M8006C268(ERAB_REL_ENB_RNL_UEL)+ M8006C269(ERAB_REL_ENB_TNL_TRU)+ M8006C271(ERAB_REL_ENB_RNL_EUGR)+
M8006C272(ERAB_REL_ENB_RNL_RRNA)+ M8006C280(ERAB_REL_ENB_TNL_UNSP)+ M8006C276(ERAB_REL_HO_FAIL_TIM)+ ENB
INI due to OTHER
Abnormal Release 3
EPC_EPS_BEARER_REL_REQ_RNL + EPC_EPS_BEARER_REL_REQ_OTH + ERAB_REL_EPC_PATH_SWITCH
5
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
M8006C261(ERAB_REL_HO_PART) : This measurement provides the number of E-RABs released due to a partial HO.
The partial HO means that the HO for the admitted E-RABs was successfully completed,although not all E-RABs were admitted by the HO
target during HO preparation. The counter is incremented with the number of E-RABs not admitted by the HO target. The counter is maintained
in the source cell regardless of the bearers QCI.
Intra-eNB HO:
The counter is updated upon the reception of the eNB internal UE CONTEXT RELEASE REQUEST message. The counter is incremented at
the source cell with the number of bearers not admitted by the target eNB of the preceding HO preparation procedure. S1AP: E-RAB Release
Indication to the MME informs about the E-RABs which have been released.
Inter-eNB HO via X2:
Following the reception of the X2AP:UE CONTEXT RELEASE message, the counter is incremented with the number of bearers not admitted by
the target eNB of the preceding HO preparation procedure. The bearers, which are not admitted, are contained in the "E-RABs Not Admitted
List" IE of the X2AP:HANDOVER REQUEST ACKNOWLEDGE message that is received from the target eNB (3GPP TS 36.423).
Inter-eNB HO via S1/Inter-system HO to UTRAN/SRVCC to UTRAN:
Following the reception of the S1AP:UE CONTEXT RELEASE COMMAND message with the cause "RNL Successful Handover", the counter is
incremented with the number of bearers not admitted by the HO target of the preceding HO preparation procedure. The bearers, which are not
admitted, are contained in the "E-RABs to Release List" IE of the S1AP:HANDOVER COMMAND message that is received from MME (3GPP
TS 36.413).
6
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
M8006C268(ERAB_REL_ENB_RNL_UEL) : This counter is updated following the transmission of an S1AP:UE CONTEXT RELEASE
REQUEST message with the RNL cause "Radio Connection with UE lost" sent by the eNB to the MME. If the S1AP:UE CONTEXT RELEASE
REQUEST message with the RNL cause "Radio Connection with UE lost" is sent due to failed intra-eNB HO, (for example, expiration of HO
guard timer THOoverall), the counter ERAB_REL_HO_FAIL_TIM is incremented instead. The counter is incremented with the number of
released E-RABs (3GPP TS 36.413).
M8006C269(ERAB_REL_ENB_TNL_TRU) : This counter is updated following the transmission of an S1AP:E-RAB RELEASE INDICATION
message or an S1AP:UE CONTEXT RELEASE REQUEST message sent by the eNB to the MME with the TNL cause "Transport Resources
Unavailable". The counter is incremented with the number of released E-RABs (3GPP TS 36.413).
M8006C271(ERAB_REL_ENB_RNL_EUGR) : This counter is updated following the transmission of an S1AP:UE CONTEXT RELEASE
REQUEST message with the RNL cause "E-UTRAN Generated Reason" sent by the eNB to the MME if the release cause is not set due to an
intra LTE redirect. The counter is incremented with the number of released E-RABs (3GPP TS 36.413).
M8006C272(ERAB_REL_ENB_RNL_RRNA) : This counter is updated following the transmission of an S1AP:E-RAB RELEASE INDICATION
or an S1AP:UE CONTEXT RELEASE REQUEST message sent by the eNB to the MME. The counter is incremented with the number of ERABs released with the RNL cause "Radio resources not available" (3GPP TS 36.413).
M8006C280(ERAB_REL_ENB_TNL_UNSP) : This measurement provides the number of E-RABs released due to a failed Handover
Completion phase at the target cell. This counter is updated following the transmission of an S1AP:UE CONTEXT RELEASE REQUEST
message sent by the eNB to the MME. The counter is incremented with the number of E-RABs released with the TNL cause "TNL Unspecified"
(3GPP TS 36.413).
7
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
M8006C276(ERAB_REL_HO_FAIL_TIM) : This measurement provides the number of E-RABs that are abnormally released due to the
expiration of the HO Guard Timer for an "intra-LTE HO", "inter-system HO to UTRAN", "SRVCC to UTRAN", or "SRVCC to GSM". The counter
is maintained in the source cell regardless of the bearers QCI.
This counter is updated following the transmission of the S1AP:UE CONTEXT RELEASE REQUEST message to the MME due to the expiration
of the Handover Guard Timer for outgoing "intra-LTE HO", "inter-system HO to UTRAN", "SRVCC to UTRAN", or "SRVCC to GSM".
Intra-eNB HO:
Upon the transmission of the S1AP:UE CONTEXT RELEASE REQUEST message to the MME due to the expiration of the Handover Guard
Timer THOoverall, the counter is incremented with the number of bearers admitted during the preceding HO preparation procedure. The
admitted bearers are contained in the eNB internal message representing the "Handover Request Acknowledge".
Inter-eNB HO via X2:
Upon the transmission of the S1AP:UE CONTEXT RELEASE REQUEST message to the MME due to the expiration of the Handover Guard
Timer TX2RELOCoverall, the counter is incremented with the number of bearers admitted by the target eNB during the preceding HO
preparation procedure. The admitted bearers are contained in the "E-RABs Admitted List" IE of the X2AP:HANDOVER REQUEST
ACKNOWLEDGE message that is received from the target eNB (3GPP TS 36.423).
Inter-eNB HO via S1/Inter-system HO to UTRAN/SRVCC to UTRAN/SRVCC to GSM:
Upon the transmission of the S1AP:UE CONTEXT RELEASE REQUEST message to the MME due to the expiration of the Handover Guard
Timer TS1RELOCoverall, the counter is incremented with the number of bearers admitted by the HO target during the preceding HO
preparation procedure. The bearers, which are not admitted, are contained in the "E-RABs to Release List" IE of the S1AP:HANDOVER
COMMAND message that is received from MME (3GPP TS 36.413).
8
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
M8006C280(ERAB_REL_ENB_TNL_UNSP) : This measurement provides the number of E-RABs released due to a failed Handover
Completion phase at the target cell. This counter is updated following the transmission of an S1AP:UE CONTEXT RELEASE REQUEST
message sent by the eNB to the MME. The counter is incremented with the number of E-RABs released with the TNL cause "TNL Unspecified"
(3GPP TS 36.413).
M8006C8(EPC_EPS_BEARER_REL_REQ_RNL) : The number of EPC-initiated EPS Bearer Release requests due to the Radio Network
Layer cause. Each bearer of the "E-RAB to be Released List" IE is counted. In case of a UE context release command, all established EPS
Bearers are counted. Reception of an S1AP:E-RAB RELEASE COMMAND or an S1AP:UE CONTEXT RELEASE COMMAND message sent by
MME to the eNB. The counter is not incremented in case that the S1AP:UE CONTEXT RELEASE COMMAND is received as a response to a
previously sent S1AP:UE CONTEXT RELEASE REQUEST
M8006C9(EPC_EPS_BEARER_REL_REQ_OTH) : The number of released Data-Radio Bearers due to Other Reasons. Each bearer of the "ERAB To Be Released List" IE has to be counted. In case of a UE context release command, all established EPS Bearer are counted. Reception
of an S1AP:E-RAB RELEASE COMMAND or an S1AP:UE CONTEXT RELEASE COMMAND message sent by MME to the eNB. The counter
is not incremented in case that the S1AP:UE CONTEXT RELEASE COMMAND is received as a response to a previously sent S1AP:UE
CONTEXT RELEASE REQUEST. The counter is updated if the release cause does not match any other failure counter.
M8006C277(ERAB_REL_EPC_PATH_SWITCH) : This measurement provides the number of E-RABs abnormally released in case that EPC
has failed to perform the UP path switch for at least one, but not for all, and at least for one non-GBR E-RAB the UP path switch was
successful, of the E-RABs included in the preceding S1AP: PATH SWITCH REQUEST. This counter is incremented with the number of E-RABs
contained in the "E-RAB To Be Released List" IE of the S1AP: PATH SWITCH REQUEST ACKNOWLEDGE message for any cause except
"NAS: Normal Release", which is received from the MME (3GPP TS 36.413).
9
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
fALU Counter Name based formula
(VS.NormalERABRelease.QCI2 + VS.NormalERABRelease.QCI3 + VS.NormalERABRelease.QCI4 + VS.NormalERABRelease.QCI5 +
VS.NormalERABRelease.QCI6 + VS.NormalERABRelease.QCI7 + VS.NormalERABRelease.QCI8 + VS.NormalERABRelease.QCI9)
/
(VS.NormalERABRelease.QCI2 + VS.NormalERABRelease.QCI3 + VS.NormalERABRelease.QCI4 + + VS.NormalERABRelease.QCI5 +
VS.NormalERABRelease.QCI6 + VS.NormalERABRelease.QCI7 + VS.NormalERABRelease.QCI8 +VS.NormalERABRelease.QCI9 +
VS.AbnormalERABReleasePerQCI.QCI2 + VS.AbnormalERABReleasePerQCI.QCI3 + VS.AbnormalERABReleasePerQCI.QCI4 +
VS.AbnormalERABReleasePerQCI.QCI5 + VS.AbnormalERABReleasePerQCI.QCI6 + VS.AbnormalERABReleasePerQCI.QCI7 +
VS.AbnormalERABReleasePerQCI.QCI8 + VS.AbnormalERABReleasePerQCI.QCI9 + VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI2 +
VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI3 + VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI4 +
VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI5 + VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI6 +
VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI7 + VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI8 +
VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI9 + VS.OtherAbnormalERABReleasePerQCI.QCI2 + VS.OtherAbnormalERABReleasePerQCI.QCI3 +
VS.OtherAbnormalERABReleasePerQCI.QCI4 + VS.OtherAbnormalERABReleasePerQCI.QCI5 + VS.OtherAbnormalERABReleasePerQCI.QCI6 +
VS.OtherAbnormalERABReleasePerQCI.QCI7 + VS.OtherAbnormalERABReleasePerQCI.QCI8 + VS.OtherAbnormalERABReleasePerQCI.QCI9) (VS.UEContextReleaseCommand.AbnormalReleaseRadioConnWithUELostAfterContextEstablished *
((SAEB.EstabInitSuccNbr.QCIX+SAEB.EstabAddSuccNbr.QCIX)/VS.InitialContextSetupSuccess)))
fALU FSM Counter ID based formula
(( L12608_1 )+( L12608_2 )+( L12608_3 )+( L12608_4 )+( L12608_5 )+( L12608_6 )+( L12608_7 )+( L12608_8 ))
/
(( L12608_1 )+( L12608_2 )+( L12608_3 )+( L12608_4 )+( L12608_5 )+( L12608_6 )+( L12608_7 )+( L12608_8 )+( L12609_1 )+( L12609_2 )+( L12609_3 )+
( L12609_4 )+( L12609_5 )+( L12609_6 )+( L12609_7 )+( L12609_8 )+( L12634_1 )+( L12634_2 )+( L12634_3 )+( L12634_4 )+( L12634_5 )+( L12634_6 )+
( L12634_7 )+( L12634_8 )+NZ(( L12644_1 )+( L12644_2 )+( L12644_3 )+( L12644_4 )+( L12644_5 )+( L12644_6 )+( L12644_7 )+( L12644_8 ))(((((( L12605_1 ))+(( L12605_2 ))+(( L12605_3 ))+(( L12605_4 ))+(( L12605_5 ))+(( L12605_6 ))+(( L12605_7 ))+(( L12605_8 ))+(( L12607_1 ))+(( L12607_2 ))+
(( L12607_3 ))+(( L12607_4 ))+(( L12607_5 ))+(( L12607_6 ))+(( L12607_7 ))+(( L12607_8 ))))/(( L12501_1 )+( L12501_0 )))*( L12507_10 )))
10
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
LTE DATA RET FL17 (without PS DS1) = Normal release / Normal release + Abnormal release
( VS_ERAB_QCI2_rel_normal + VS_ERAB_QCI3_rel_normal + VS_ERAB_QCI4_rel_normal +
+ VS_ERAB_QCI5_rel_normal + VS_ERAB_QCI6_rel_normal + VS_ERAB_QCI7_rel_normal + VS_ERAB_QCI8_rel_normal
+ VS_ERAB_QCI9_rel_normal )
/
( VS_ERAB_QCI2_rel_normal + VS_ERAB_QCI3_rel_normal + VS_ERAB_QCI4_rel_normal + VS_ERAB_QCI5_rel_normal +
VS_ERAB_QCI6_rel_normal + VS_ERAB_QCI7_rel_normal + VS_ERAB_QCI8_rel_normal + VS_ERAB_QCI9_rel_normal +
VS_ERAB_QCI2_rel_abnormal + VS_ERAB_QCI3_rel_abnormal + VS_ERAB_QCI4_rel_abnormal +
VS_ERAB_QCI5_rel_abnormal +
VS_ERAB_QCI6_rel_abnormal + VS_ERAB_QCI7_rel_abnormal + VS_ERAB_QCI8_rel_abnormal + VS_ERAB_QCI9_rel_ab
normal + VS_ERAB_QCI2_rel_abnormal_RLF + VS_ERAB_QCI3_rel_abnormal_RLF + VS_ERAB_QCI4_rel_abnormal_RLF
+ VS_ERAB_QCI5_rel_abnormal_RLF
+ VS_ERAB_QCI6_rel_abnormal_RLF + VS_ERAB_QCI7_rel_abnormal_RLF + VS_ERAB_QCI8_rel_abnormal_RLF + VS_E
RAB_QCI9_rel_abnormal_RLF +NZ( VS_ERAB_QCI2_rel_abnormal_other_OD + VS_ERAB_QCI3_rel_abnormal_other_OD
+ VS_ERAB_QCI4_rel_abnormal_other_OD +
+ VS_ERAB_QCI5_rel_abnormal_other_OD + VS_ERAB_QCI6_rel_abnormal_other_OD + VS_ERAB_QCI7_rel_abnormal_ot
her_OD + VS_ERAB_QCI8_rel_abnormal_other_OD + VS_ERAB_QCI9_rel_abnormal_other_OD )
(VS.UEContextReleaseCommand.AbnormalReleaseRadioConnWithUELostAfterContextEstablished *
((SAEB.EstabInitSuccNbr.QCIX+SAEB.EstabAddSuccNbr.QCIX)/VS.InitialContextSetupSuccess)))
11
Confidential
© Nokia 2017
= Normal release wo QCI1
= Normal release wo QCI1
= Abnormal release wo
QCI1
= Remove Double S1
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
(VS.AbnormalERABReleasePerQCI.QCIx (VS_ERAB_QCIx_rel_abnormal) : This counter provides the number of established E-RABs
abnormally released. Transient ERABs are excluded (e.g. UE's E-RABs on the target for failed HO, QCI1 being released upon reception of
ERAB Release Command that triggers 12608.QCI1 pegging).
This counter is triggered when any of the following situations occur:
1. UE Context Release command is received with any abnormal cause for UE whose E-RABs have been established, and when the UE
Context Release request has not been sent previously.
2. E-RAB is locally released due to S1-Reset MME initiated.
3. E-RAB is locally released due to S1-Reset eUTRAN initiated or due to other reasons eUTRAN initiated (that is bad MME/eNB S1AP ID).
4. E-RAB is locally released on Path Switch Partial Failure if the target doesn't include the private IE ‘E-RABs Not Admitted’ in X2 UE Context
Release sent to the source. This includes a case where the incoming HO is a success (e.g. no RLF Indication sent to the source), and a case
where the HO is a failure (e.g. RLF Indication was sent to the source previously) but RLF is recovered on the target. Note: If the private IE is
included in X2 UE Context Release, 12609 is not pegged on the target. Instead, the former will be pegged by counter 12644 on the source (see
12644 UC#6 and also 14637), whereas the latter will also be pegged by 12644 on the source (see 12644 UC#12), and RLF-recovered E-RABs
will be tracked by VS.OutERABSetupByCellAfterRLF more accurately than without the private IE (see 12649 UC#3).
12
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
5. UE Context Release command is received after sending UE Context Release request when the cause in the UE Context Release request is
Release due to E-UTRAN generated reason or Failure in the Radio Interface Procedure.
6. E-RAB is locally released after the cell-barring hysteresis timer is armed or the eNodeB Cells Barred alarm is raised for the eNodeB as a
result of S1 links outage. Or E-RAB is locally released due to loss of S1 link to the serving MME.
7. E-RAB Release command is received with an abnormal cause.
8. Established E-RAB is locally released via E-RAB Release Indication due to reactive or immediate load control.
9. Established E-RABs of UE are released via UE Context Release Request with cause ‘Reduce Load in Serving Cell’ or ‘control processing
overload’ due to reactive or immediate load control (that is, inter-freq/IRAT redirection). E-RABs release due to RRC release without redirection
is pegged by 12644 UC 5.
10. Handover Command from MME is received during an on-going inter-RAT procedure and contains ‘E-RABs to Release List’ IE indicating the
set of E-RABs not accepted by the target RAT (e.g. SRVCC to UTRA-FDD/TDD, SRVCC to GERAN, PSHO to UTRA, CSFB PS HO to UTRA).
In SRVCC “CS Only” case, for example, all non QCI1 E-RABs will be indicated in 'E-RABs to Release List' IE and they are considered as
abnormally released.
13
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCIx(VS_ERAB_QCIx_rel_abnormal_RLF) : This counter provides the number of
established E-RABs released due to radio link failure detected.
This counter is triggered when UE Context Release Command is received in response to UE Context Release Request with cause ‘Radio
Connection with UE Lost’ sent to the MME due to radio link failure detected (and no intra-eNB re-establishment request received from the UE or
re-establishment failed).
This counter is also triggered when UE Context Release Command is received in response to UE Context Release Request sent to the MME
due to expiry of Double-S1 Wait Timer started upon reception of X2 RLF Indication while intra-LTE HO or inter-RAT was ongoing, implying all ERABs of the UE has failed to be setup on the target or an unprepared eNB cell.
14
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
VS.OtherAbnormalERABReleasePerQCI.QCIx (VS_ERAB_QCI2_rel_abnormal_other_OD) : This counter provides the number of established
E-RABs abnormally released for reasons beyond those listed in 12609 and 12634. This counter will exclude bearer drops due to mobility, double
S1 2386 scenario, Re-establishment failures and RLF. Currently, Abnormal Release counter captures 2387 double S1 related drop and some of
the causes of eNodeB/MME reset. Goal here is to 2388 decouple them from double S1 scenario.
This counter is triggered when any of the following situations occur that results in the release of all the E-RABs of the
UE:
1. eNB times out waiting for X2AP release.
2. or waiting for S1-AP UE Ctxt Rel Cmd (Context Release Command) during S1 HO.
3. Source/target cell (RRCintraENBHO timer) times out waiting for intra-eNB HO complete or RRE Wait timer (started upon timeout of
RRCintraENBHO) times out. Note: eNB sets "Radio Connection with UE Lost" cause in UE Ctxt Rel Req (Request) sent to MME and pegs 1250530. For E-RAB release, this counter rather than 12634 is pegged.
4. When UE in OOT state attempting transition to Active state is released (with or w/o redirection) due to PUCCH/SRS resource shortage 'Radio
resources not available' in UE Ctxt Rel Cmd sent to MME and 12505-23 is pegged.
5. When other radio resource shortage scenarios is encountered resulting in 'Radio resources not available' in UE Ctxt Rel Cmd sent to MME. If
the message is triggered by CAC failure at the time of RRC connection attempt (when redirection upon CAC failure is enabled), it is pegged only
when RRC connection is released without redirection (when 12505-37 is pegged).
15
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
6. When partial failure occurs during intra-eNB HO or intra-eNB inter-cell RRC Re-estab and E-RAB Rel Ind (Indication) is sent to MME (12616-0
is pegged), or when partial failure occurs during inter-eNB HO (failed E-RABs are delta between 14636 and 14637 contributed by concerned UE).
7. When Source eNB receives S1AP UE Ctxt Rel Cmd during intra-LTE HO with abnormal release cause except 'Radio Connection with UE Lost'
(the double S1 case), where 12507-8 is pegged (12609 is pegged when 12507-10 is pegged).
8. When UE Ctxt Rel Req is sent to MME with cause ‘Unspecified’.
9. When UE requesting to add emergency call or non-HPA UE requesting to change an E-RAB to HPA E-RAB is RRC released to minimize HO
failure risk as cell shrink already in progress on serving cell.
10. (Deferred) When X2 RLF Ind is received from Non-Target eNB during outgoing intra-LTE HO or from neighbor eNB Not during HO, followed
by S1 HO Cmd (Command) containing IE 'E-RABs to Release List', followed by UE Ctxt Rel Cmd with cause 'HO Successful' from MME. It is the
case where UE Context fetch from old serving eNB using S1 HO procedure is successful but some of E-RABs setup on unprepared cell is partial,
e.g: CAC failure/lack of radio resource (partial failure occurs during inter-eNB RRC re-estab). The pegged E-RABs by old-serving cell are based
on 'E-RABs to Release List' IE in S1 HO Cmd.
11. When during S1 HO an X2 RLF Ind is received from target eNB, followed by S1 HO Cmd containing 'E-RABs to Release List', followed by UE
Ctxt Rel Cmd with cause 'HO Successful' from MME. The pegged E-RABs by source cell are based on 'E-RABs to Release List' IE in S1 HO
Cmd.
16
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Abnormal Release Counters
12. When during X2 HO an X2 RLF Ind is received from target eNB, followed by a private IE 'E-RABs Not Admitted' is received in X2 UE Ctxt Rel
from target due to partial failure in CAC or Path Switch procedure. The pegged E-RABs by source cell are based on that IE.
13. When X2 RLF Ind is received from Non-Target eNB during outgoing intra-LTE HO or from neighbor eNB Not during HO, or from neighbor eNB
during IRAT, followed by X2 HO Req Ack and X2 UE Ctxt Rel. It is the case where UE Context fetch from old serving eNB using X2 HO procedure
is successful but some of E-RABs setup on unprepared cell is partial, e.g: CAC failure/lack of radio resource (partial failure occurs during intereNB RRC re-estab). The pegged E-RABs by old-serving cell are based on private IE 'E-RABs Not Admitted' in X2 UE Ctxt Rel.
14. When some E-RAB(s) are released for a VoLTE UE due to TTI-Bundling activation (12616-3 is pegged).
17
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Double S1 Counters
(VS.UEContextReleaseCommand.AbnormalReleaseRadioConnWithUELostAfterContextEstablished : After the successful establishment of
the dedicated S1 connection as a result S1 Initial Context Setup procedure or incoming Handover or RRC re-establishment with UE context fetch,
UE CONTEXT RELEASE COMMAND from MME is received with cause = ‘Radio Connection with UE Lost’, and no UE CONTEXT RELEASE
REQUEST has been sent to MME previously. In incoming Handover case, the dedicated S1 connection is established when Handover completes.
In the case where RRC re-establishment procedure is successful after UE Context fetch, the dedicated S1 connection is established when S1
Path Switch procedure successfully completes (including partial success).
SAEB.EstabInitSuccNbr.QCIX : This counter monitors initial E-RABs successfully established. Initial E-RABs are the ones that are setup through
Initial Context Setup procedure. This counter is triggered when INITIAL CONTEXT SETUP RESPONSE message is sent.
This counter is also triggered when UE Context Release Request(‘Redirection towards 1xRTT’) is sent to MME in response to reception of
INITIAL CONTEXT SETUP REQUEST(‘CSFB Indicator’) and neither INITIAL CONTEXT SETUP RESPONSE nor INITIAL CONTEXT SETUP
FAILURE is returned to MME due to eNB::idle1xCsfbForDualRxUE indicating 1xCSFB KPI optimization.
SAEB.EstabAddSuccNbr.QCIX : This counter monitors additional E-RABs successfully established. Additional E-RABs are 2159 the ones that
are setup through E-RAB Setup procedure. This counter is triggered when an E-RAB SETUP RESPONSE message is sent indicating that at least
one requested E-RABs have been established.
18
VS.InitialContextSetupSuccess : This counter provides the number of Initial Context Setup procedures that have been performed successfully.
This counter is triggered when INITIAL CONTEXT SETUP RESPONSE message is sent.
This counter is also triggered when UE Context Release Request(‘Redirection towards 1xRTT’) is sent to MME in response to reception of
INITIAL CONTEXT SETUP REQUEST(“CSFB Indicator”) and neither INITIAL CONTEXT SETUP RESPONSE nor INITIAL CONTEXT SETUP
FAILURE is returned to MME due to eNB::idle1xCsfbForDualRxUE indicating 1xCSFB KPI optimization.
Confidential
© Nokia 2017
VoLTE Eucell eRab Retainability % Excluding
Double S1 & Path Switch
19
Confidential
© Nokia 2017
VoLTE Eucell eRab Retainability Excluding DS1 %
FSM Counter Name based formula
Volte_Retainabilit
y_Counters
(ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_N_QCI1 +
EPC_EPS_BEAR_REL_REQ_D_QCI1+ERAB_REL_SUCC_HO_UTRAN_QCI1 + ERAB_REL_SUCC_HO_GERAN_QCI1)
/
((ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_N_QCI1 +
EPC_EPS_BEAR_REL_REQ_D_QCI1+ERAB_REL_SUCC_HO_UTRAN_QCI1 + ERAB_REL_SUCC_HO_GERAN_QCI1) +
(ERAB_REL_HO_PART_QCI1 + ERAB_REL_ENB_QCI1- ERAB_REL_ENB_RNL_INA_QCI1 - ERAB_REL_ENB_RNL_RED_QCI1 +
EPC_EPS_BEAR_REL_REQ_R_QCI1 + EPC_EPS_BEAR_REL_REQ_O_QCI1 - ERAB_REL_DOUBLE_S1_QCI1))
FSM Counter ID based formula
(M8006C270 + M8006C89 + M8006C98 + M8006C304 + M8006C307)
/
((M8006C270 + M8006C89 + M8006C98 + M8006C304 + M8006C307) + (M8006C273 + M8006C266 - M8006C267 - M8006C270 +
M8006C107 + M8006C116 - M8006C315))
Note (Abnormal release):
M8006C266(ERAB_REL_ENB_QCI1) - M8006C267(ERAB_REL_ENB_RNL_INA_QCI1) - M8006C270(ERAB_REL_ENB_RNL_RED_QCI1) =
M8006C268(ERAB_REL_ENB_RNL_UEL_QCI1)+ M8006C269(ERAB_REL_ENB_TNL_TRU_QCI1)+
M8006C271(ERAB_REL_ENB_RNL_EUGR_QCI1)+ M8006C272(ERAB_REL_ENB_RNL_RRNA_QCI1)+
M8006C280(ERAB_REL_ENB_TNL_UNSP_QCI1)+ M8006C276(ERAB_REL_HO_FAIL_TIM_QCI1)+ ENB INI due to OTHER
20
Confidential
© Nokia 2017
VoLTE Eucell eRab Retainability Excluding DS1 %
VoLTE Eucell eRab Retainability Excluding DS1 % = Normal release / Normal release + Abnormal release
(ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_N_QCI1 +
EPC_EPS_BEAR_REL_REQ_D_QCI1+ERAB_REL_SUCC_HO_UTRAN_QCI1 + ERAB_REL_SUCC_HO_GERAN_QCI1)
= Normal release for QCI1
/
((ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_N_QCI1 +
EPC_EPS_BEAR_REL_REQ_D_QCI1+ERAB_REL_SUCC_HO_UTRAN_QCI1 + ERAB_REL_SUCC_HO_GERAN_QCI1) +
(ERAB_REL_HO_PART_QCI1 + ERAB_REL_ENB_QCI1- ERAB_REL_ENB_RNL_INA_QCI1 ERAB_REL_ENB_RNL_RED_QCI1 + EPC_EPS_BEAR_REL_REQ_R_QCI1 + EPC_EPS_BEAR_REL_REQ_O_QCI1 –
21
© Nokia 2017
= Abrormal release for QCI1
= Remove Double S1 : (DS1
CQI1)
ERAB_REL_DOUBLE_S1_QCI1))
Confidential
= Normal release for QCI1
Double S1 removed
VoLTE Eucell eRab Retainability Excluding DS1 %
fALU Counter Name based formula
(VS.NormalERABRelease.QCI1 - NZ(VS.ERABRelDueToUserInactivity.QCI1))
/
(VS.NormalERABRelease.QCI1 -NZ(VS.ERABRelDueToUserInactivity.QCI1) + VS.AbnormalERABReleasePerQCI.QCI1 +
VS.ERABReleasedDueToRadioLinkFailurePerQCI.QCI1 + VS.OtherAbnormalERABReleasePerQCI.QCI1 VS.UE.ctxt.rel.cmd.abnormal.UEradioCnxLostAfterCtxtEstablishedWithQCI1 )
fALU Counter ID based formula
(((( L12608_0 )-NZ(( L12674_0 )))))
/
(((( L12608_0 )-NZ(( L12674_0 ))))+ ((( L12609_0 )+( L12634_0 ))+NZ(( L12644_0 ))-NZ((( L12507_15 )))))
22
Confidential
© Nokia 2017
LTE Data Retainability FL17 (Total Without PS DS1)
Additional Counters
ERABRelDueToUserInactivity : This counter provides the number of E-RABs released by eNB due to user Inactivity, per QCI.
This counter
is pegged when eNB releases an E-RAB due to user inactivity. Specifically, it is pegged when an E-RAB is included in a UE CONTEXT RELEASE
REQUEST message or in an E-RAB RELEASE INDICATION message with the cause set to “User Inactivity”.
.
23
Confidential
© Nokia 2017
24
Confidential
© Nokia 2017