VoLTE KPI Performance
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This document discusses various key performance indicators (KPIs) for Voice over LTE (VoLTE) networks. It describes KPIs for VoLTE control plane performance like registration success rate, call setup success rate, and call setup time. It also covers user plane KPIs such as mute rate, mean opinion score, RTP packet loss rate, and one way call rate. Additionally, it lists KPIs for packet core network elements like attach success rate, paging success rate, and IP pool utilization. The document provides details on calculating each KPI and healthy range benchmarks.
VoLTE KPI Performance
- 2. PSTN / Voice NetworkIMS NetworkLTE Network MME SGw PGw SBC & P-CSCF TAS EPC VoLTE 3GPP TS 32.454 3GPP TS 32.409 GSMA IR.42 Radio Probe 3GPP TS 32.454 3GPP TS 32.409 GSMA IR.42 VoLTE KPI – Node Wise http://TelecomTutorial.info
- 3. PSTN / Voice NetworkIMS NetworkLTE Network MME SGw PGw SBC & P-CSCF TAS EPC VoLTE 3GPP TS 32.454 3GPP TS 32.409 GSMA IR.42 Radio Radio KPIs •VoLTE Call Drop rate •SRVCC Success Rate •Handover SR : S1 , X2 MME KPIs •VoLTE ASR - Volte Attach Success Rate •VoLTE PSR - Paging Success Rate •Dedicated Bearer Activation Success Rate SGW / PGW KPIs •IMS IP POOL Utilization •Create Bearer Success Rate P-CSCF Probe KPIs •RSR - Registration Success Ratio •Mute Rate •MOS Score •RTP Packet Loss •One Way Calls TAS KPIs •CSSR - Call Setup Success Rate •CST - Call Setup Time •MHT/ACD - Average Call duration Probe VoLTE IMS KPIs & Performance indicators http://TelecomTutorial.info
- 4. VoLTE Control Plane Performance KPIs PSTN / Voice NetworkIMS NetworkLTE Network MME SGw PGw SBC & P-CSCF TAS EPC VoLTE VoLTE Performance KPIs • CSSR Call Setup Success Rate (%) • CST Call Setup Time (s) • MHT/ACD Average Call duration (s) • RSR Registration Success Ratio (%) Control Plane http://TelecomTutorial.info
- 5. IMS Network LTE Network EPC VoLTE Registration Response 200 OK SIP REGISTER Registration Request Success % Category VoLTE Accessibility Parameters Source of Counter Typically P-CSCF, CSCF can also be used Formulae (%) Purpose of Counter This parameter denotes the probability of UE successfully registering to IMS Network , Impact of KPI : With Low RSR , Customers will not be able to use VoLTE Services RSR (%) : Registration Success Rate CSSR (%) : Call Setup Success Rate CST (s) :Call Setup Time ACD (s) : Avg Call Dur. RSR - VoLTE Registration Success Rate (%) 99% + Count of SIP REGISTER Sent from UE Count of (200 OK) for Registration Completed 100% VoLTE Control Plane Performance KPIs Healthy Range P-CSCF Excluding 401 Error Attempts RSR http://TelecomTutorial.info
- 6. IMS Network LTE Network EPC VoLTE Count of ( Normal End of Call + Call failed with User Behavior ) Outgoing Call INVITE from User Success % Category VoLTE service integrity and retainability Source of Counter Typically TAS , But CSCF can also be used Formulae (%) ( MO Call ) Purpose of Counter The CSSR indicates the probability of successful calls initiated by the MS , Impact of KPI : With Low CSSR , Customers will not be able to use make or Received VoLTE Calls RSR (%) : Registration Success Rate CSSR (%) : Call Setup Success Rate CST (s) :Call Setup Time ACD (s) : Avg Call Dur. CSSR - Call Setup Success Rate - MO , MT (%) 99% + Sum of all Call Attempts Count of ( Normal End of Call + Call failed with User Behavior ) 100% Healthy Range TAS CSSR VoLTE Control Plane Performance KPIs http://TelecomTutorial.info
- 7. IMS Network LTE Network EPC VoLTE 180 Ringing Outgoing Call INVITE Request from User Time Difference RSR (%) : Registration Success Rate CSSR (%) : Call Setup Success Rate CST (s) : Call Setup Time ACD (s) : Avg Call Dur. CST - Call Setup Time (s) TAS Category VoLTE service integrity and retainability Source of Counter Typically TAS Formulae ( Sec ) Purpose of Counter CST is Time between the start of the call and the moment the phone of the called party starts ringing. Impact : High CST will lead to delays & Silence period before Ring, High CST will obviously will deteriorate user experience <2.5 s Avg of ( Time(180 Ringing) - Time( SIP INVITE Request ) ) Healthy Range CST VoLTE Control Plane Performance KPIs http://TelecomTutorial.info
- 8. IMS Network LTE Network EPC VoLTE Call End - BYE Call Answer - 200 OK Ans (INVITE) Time Difference RSR (%) : Registration Success Rate CSSR (%) : Call Setup Success Rate CST (s) :Call Setup Time ACD (s) : Avg Call Dur. MHT or ACD - Average Call Duration (s) TAS Category VoLTE service integrity and retainability Source of Counter TAS Formulae (Sec) Purpose of Counter ACD is the average length of an answered call made over the network . Impact :- Sudden degradation of ACD Depicts problem in voice path , Either Calls are getting Muted or Getting One Way Audio or May be having Garbled and bad voice Quality Avg Call Duration ( Time(BYE) – Time (200 OK Ans INVITE)) VoLTE Control Plane Performance KPIs http://TelecomTutorial.info
- 9. IMS Network LTE Network EPC VoLTE Call Failed with Clear Code Outgoing Call INVITE from User << Error Codes <<< Clear Code Monitoring in TAS TAS Bonus Tip PSTN MSC Clear Code : Clear Code or End of Selection (EOS) depicts possible reason for failure of call Uses of Clear Codes based Monitoring • Complete Check on Outgoing call made by Users • Detect failures at Early stage • Detect & Alert Network Outage • Detect External Failures such as POI Congestion , Failures in Other Operator • Detect Internal failures as well http://TelecomTutorial.info
- 10. VoLTE User Plane Performance KPIs PSTN / Voice NetworkIMS NetworkLTE Network MME SGw PGw SBC & P-CSCF TAS • Mute Rate (%) • MOS Score (1-5) • RTP Packet Loss (%) • One Way Calls (%) EPC VoLTE 3GPP TS 32.454 3GPP TS 32.409 GSMA IR.42 VoLTEUserPlane PerformanceKPIs Probe http://TelecomTutorial.info
- 11. IMS Network LTE Network EPC VoLTE Mute Rate (%) MOS Score (1-5) RTP Packet Loss (%) One Way Calls (%) VoLTE Mute Rate (%) SBC Or Probe Category VoLTE service integrity (voice quality) Source of Counter External Probe / Packet capture or SBC for few OEMs Formulae (%) Purpose of Counter Impact :- User unable to Talk leading to degraded user experience <1% % of Calls Muted ( samples > 2 or 5s RTP loss in both direction will be treated as Muted call ) Healthy Range Of Total Calls RTP Packets getting lost in Both Direction Packet loss Packet loss Count % of Call Impacted VoLTE User Plane Performance KPIs http://TelecomTutorial.info
- 12. IMS Network LTE Network EPC VoLTE MOS Score ( 1 to 5 ) VoLTE User Plane Performance KPIs SBC Or Probe Category VoLTE service integrity (voice quality) Source of Counter SBC or External Probe / Packet capture MOS, Mean Opinion Score is a measure of voice quality, and is a quality measure that has been used in telephony for decades as a way to assess the human users opinion of call quality . Impact :- Low MOS bad speech Quality >3.5 Healthy Range MOS Value Calculate MOS Mute Rate (%) MOS Score (1-5) RTP Packet Loss (%) One Way Calls (%) http://TelecomTutorial.info
- 13. IMS Network LTE Network EPC VoLTE VoLTE RTP Packet Loss % SBC Or Probe Category VoLTE service integrity (voice quality) Source of Counter SBC Formulae (%) Purpose of Counter Impact :- High Packet loss will lead to Mutes , One Way talk , Call Drops , Bad Quality , Garbled Voice <1% % Percentage of RTP packets lost in the uplink or Downlink direction Healthy Range PACKET LOSS RTP Packets getting lost anywhere Packet loss Packet loss Count % of RTP Packets Lost RTP RTP VoLTE User Plane Performance KPIs Mute Rate (%) MOS Score (1-5) RTP Packet Loss (%) One Way Calls (%) http://TelecomTutorial.info
- 14. IMS Network LTE Network EPC VoLTE One Way Calls (%) VoLTE User Plane Performance KPIs SBC Or Probe Category VoLTE service integrity (voice quality) Source of Counter External Probe / Packet capture or SBC for few OEMs Formulae (%) Purpose of Counter Impact :- One Way talk , leading to degraded user experience <1% % of Calls having no Voice Packets Counts for 2 or 5 Sec in either the upstream or downstream direction, but not both Healthy Range Of Total CallsRTP Packets getting lost in Any One Direction Packet loss Count % of Call Impacted Mute Rate (%) MOS Score (1-5) RTP Packet Loss (%) One Way Calls (%) http://TelecomTutorial.info
- 15. LTE / 4G – VoLTE KPIs & Performance indicators PSTN / Voice NetworkIMS NetworkLTE Network MME SGw PGw SBC & P-CSCF TAS EPC VoLTE PACOKPIsforVoLTE Probe• IMS IP POOL Utilization (%) • Create Bearer Success Rate (%) • Volte Attach Success Rate (%) • VoLTE QCI=5 Paging Success Rate (%) • Dedicated Bearer Activation Success Rate (%) http://TelecomTutorial.info
- 16. Volte Attach Success Rate (%) Bearer Activation Success Rate (%) VoLTE Paging Success Rate (%) IMS IP POOL Utilization (%) VoLTE Attach Success Rate (%) VoLTE Bearer Activation Success Rate (%) PACO KPIs VoLTE UE MME SAE GW PDN Connection Request Activate Default Bearer Request Create Session request Create Session resp. IMS Volte Attach Success Rate (%) Bearer Success Rate (%) Purpose of KPI Impact :- Low Success Rate will lead to VoLTE Registration failures and customers will not be able to use VoLTE IMS Service http://TelecomTutorial.info
- 17. IMS Network LTE Network EPC VoLTE VoLTE PSR - Paging Success Rate (%) MME Paging No Response PSR = % of Paging responses on QCI:5 received at MME Volte Attach Success Rate (%) Bearer Activation Success Rate (%) VoLTE Paging Success Rate (%) IMS IP POOL Utilization (%) PACO KPIs VoLTE Purpose of KPI Impact :- Low QCI:5 PSR will lead to difficulties for users to receive Incoming Calls , They will remain in Out of Coverage http://TelecomTutorial.info
- 18. IMS Network LTE Network VoLTE IMS IP POOL Utilization (%) PGW IMS IP POOL Utilization (%) Volte Attach Success Rate (%) Bearer Activation Success Rate (%) VoLTE Paging Success Rate (%) IMS IP POOL Utilization (%) PACO KPIs VoLTE Purpose of KPI Impact :- In case IP Pool Utilization is 100% , IMS VoLTE Users will not be able to Get IP Allocated for IMS APN & Will not be able to Register VoLTE , Thereby Users Will not be able to use VoLTE Network IP Allocated IP Pool IPv4 IPv6 http://TelecomTutorial.info
- 19. • IMS IP POOL Utilization (%) • Create Bearer Success Rate (%) VoLTE IMS KPIs & Performance indicators PSTN / Voice NetworkIMS NetworkLTE Network MME SGw PGw • Volte Attach Success Rate (%) • Paging Success Rate (%) • Dedicated Bearer Activation Success Rate (%) SBC & P-CSCF TAS • RSR Registration Success Ratio (%) • Mute Rate (%) • MOS Score (1-5) • RTP Packet Loss (%) • One Way Calls (%) • Call Drop rate (%) • SRVCC Success Rate (%) • Handover SR : S1 , X2 • CSSR Call Setup Success Rate (%) • CST Call Setup Time (s) • MHT/ACD Average Call duration (s) http://TelecomTutorial.info