Modem users not able to receive CMAS messages and KPIs are deteriorated

4G LTE
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1

Hello All.

Anybody tested CMAS on modem users mbb (modem stick on computer) which is not capable of the receive those msgs so kpis detoriated.

So beside disabling sib12 no other solution I see.

Any comment experts? 4G

2

What is KPI formula you are using?

Thought CMAS messages are one way, and don’t need delivery success.

3

Basic KPIs nokia suggests.

  • LTE_5670a (Cont based RACH stp SR %)
  • Retainability DCR User perspective % erab_dcr_tot
  • Mobility HO tot SR % all degraded.

I think those CMAS message hangs modem users, yep not necessarily having ACK.

4

Can you send formula please?

Curious how CMAS is reflected in KPIs.

SMS KPIs are very difficult unless these are SMS-over-4G/IP.

5

  • LTE_5670a: 100*decode( (LTE Cell Load.RACH setup attempts for small size messages (M8001C6) + LTE Cell Load.RACH setup attempts for large size messages (M8001C7)),0,null, LTE MAC.Number of msg3 for contention-based RA procedures (M8029C32) / (LTE Cell Load.RACH setup attempts for small size messages (M8001C6) + LTE Cell Load.RACH setup attempts for large size messages (M8001C7)))

    • This KPI describes the ratio of Msg3 and RA preambles received from UE during contention based RA procedure.

  • Mobility_ho_tot_sr: 100*decode(nvl(LTE Intra eNB Handover.Intra eNB Handover preparations (M8009C2)+LTE Inter eNB Handover.Inter eNB Handover preparations (M8014C0)+LTE Inter eNB Handover.Inter eNB S1-Handover preparations (M8014C14),0),0,0, nvl(LTE Intra eNB Handover.Successful intra eNB HO (M8009C7)+LTE Inter eNB Handover.Successful inter eNB HO (M8014C7)+LTE Inter eNB Handover.Successful inter eNB S1-HO (M8014C19),0)/nvl(LTE Intra eNB Handover.Intra eNB Handover preparations (M8009C2)+LTE Inter eNB Handover.Inter eNB Handover preparations (M8014C0)+LTE Inter eNB Handover.Inter eNB S1-Handover preparations (M8014C14),0))

  • DCR: erab_dcr_tot : 100*decode((LTE EPS Bearer.E-RABs released due to partial Handover regardless of the bearers QCI (M8006C261)+LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Normal release by UE (M8006C6)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Detach procedure by UE or MME (M8006C7)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Radio Network Layer cause (M8006C8)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Other causes (M8006C9)+nvl(LTE EPS Bearer.EPC initiated E-RAB releases due to Path Switch (M8006C277),0)-nvl(LTE EPS Bearer.Temporary QCI1 E-RAB release due to overbooking timer expiry (M8006C301),0)+nvl(LTE EPS Bearer.ERAB_REL_SUCC_HO_UTRAN (M8006C303),0)+nvl(LTE EPS Bearer.ERAB_REL_SUCC_HO_GERAN (M8006C306),0)+nvl(LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)_INI_S1_GLOB_RESET,0)+nvl(LTE EPS Bearer.ERAB_REL_MME_INI_S1_GLOB_RESET (M8006C310),0)+nvl(LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)_INI_S1_PART_RESET,0)+nvl(LTE EPS Bearer.ERAB_REL_MME_INI_S1_PART_RESET (M8006C312),0)+nvl(LTE EPS Bearer.ERAB_REL_S1_OUTAGE (M8006C313),0)),0,0,(LTE EPS Bearer.E-RABs released due to partial Handover regardless of the bearers QCI (M8006C261)+LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)-LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)_RNL_INA-LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)_RNL_RED+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Radio Network Layer cause (M8006C8)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Other causes (M8006C9)+nvl(LTE EPS Bearer.EPC initiated E-RAB releases due to Path Switch (M8006C277),0)-nvl(LTE EPS Bearer.Temporary QCI1 E-RAB release due to overbooking timer expiry (M8006C301),0)+nvl(LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)_INI_S1_GLOB_RESET,0)+nvl(LTE EPS Bearer.ERAB_REL_MME_INI_S1_GLOB_RESET (M8006C310),0)+nvl(LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)_INI_S1_PART_RESET,0)+nvl(LTE EPS Bearer.ERAB_REL_MME_INI_S1_PART_RESET (M8006C312),0)+nvl(LTE EPS Bearer.ERAB_REL_S1_OUTAGE (M8006C313),0))/(LTE EPS Bearer.E-RABs released due to partial Handover regardless of the bearers QCI (M8006C261)+LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Normal release by UE (M8006C6)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Detach procedure by UE or MME (M8006C7)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Radio Network Layer cause (M8006C8)+LTE EPS Bearer.EPC initiated EPS Bearer Release requests due to Other causes (M8006C9)+nvl(LTE EPS Bearer.EPC initiated E-RAB releases due to Path Switch (M8006C277),0)-nvl(LTE EPS Bearer.Temporary QCI1 E-RAB release due to overbooking timer expiry (M8006C301),0)+nvl(LTE EPS Bearer.ERAB_REL_SUCC_HO_UTRAN (M8006C303),0)+nvl(LTE EPS Bearer.ERAB_REL_SUCC_HO_GERAN (M8006C306),0)+nvl(LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)_INI_S1_GLOB_RESET,0)+nvl(LTE EPS Bearer.ERAB_REL_MME_INI_S1_GLOB_RESET (M8006C310),0)+nvl(LTE EPS Bearer.Total number of released E-RABs initiated by the eNB (M8006C254)_INI_S1_PART_RESET,0)+nvl(LTE EPS Bearer.ERAB_REL_MME_INI_S1_PART_RESET (M8006C312),0)+nvl(LTE EPS Bearer.ERAB_REL_S1_OUTAGE (M8006C313),0))

They go over packet sessions.

6

So this is SMS over 4G or SMS with IMS?

7

SMS over 4G, modems have no support on IMS.

8

Struggling to understand KPI, but let me ask which counter has changed?

So if KPI is deteriorated than it’s either failures have increased or failures are constant but total attempts have reduced.

Can you determine which specific counters have changed?

From the counters there is no specific counter here for CMAS except for total MSG3 attempts.

9

Attempts increasing yes.

CMAS has its own counters for number of msg sent down to handset.

But thank, and no worries: I will disable CMAS on 450 band which obviously modems don’t support such messages.

No other solution.