KPI Definition
June 13, 2016 | Author: Tim King | Category: N/A
Short Description
NSN KPI definitions and description...
Description
3G RANOP RU30 KPI definition
Soc Classification level 1 © Nokia Siemens Networks
RN31572EN30GLA0
Course Content KPI definition Performance monitoring Air interface optimization Traffic monitoring Capacity enhancement
Soc Classification level 2 © Nokia Siemens Networks
RN31572EN30GLA0
Module Objectives At the end of the module you will be able to:
• Describe the principles of 3G optimization • Give an overview about the performance measurements and new features offered by RU30
• Discuss the purpose of the most important KPIs (setup, access, drop, mobility and throughput performance) and the factors impacting them
Soc Classification level 3 © Nokia Siemens Networks
RN31571EN30GLA0
KPI Definition Principles of 3G network optimization Principles of performance measurements and KPI classification KPI construction
Soc Classification level 4 © Nokia Siemens Networks
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Principles of 3G network optimization Optimization strategy
Quality & Key Performance Radio/Signaling capabilities
RAN parameters
Cell Capacity
Soc Classification level 5 © Nokia Siemens Networks
Transmission capacity
Performance indicators
Core/Mobility performance
Counters (OSS/NetAct)
RRM/Field/installation
RN31571EN30GLA0
HW capability
Cell Coverage
Principles of 3G network optimization Optimization strategy Target issues for optimizations are e.g. To achieve coverage and capacity RAN improvements by tuning of interference situations within the network Therefore check RRM to ensure that the RAN offers planned coverage for each targeted service
Evaluate high capacity i.e. low blocking for new calls and handovers Observe network performance by overall counters (NetAct, RNC counters) Define quality indicators and compare KPI’s by triggering points Check overall Quality of Service at RAN, transmission and core Optimize the use of available capacity by priorities Continuously monitoring/adjusting how the available resources are used in accordance with user requests !
Soc Classification level 6 © Nokia Siemens Networks
RN31571EN30GLA0
Principles of 3G network optimization Key performance indicator improvement COUNTER
COUNTER
statistics
Descriptive statistics
Targets Yes
PERFORMANCE
No
Targets
Performance evaluation Failure causes Event / Action item
Targets fulfilled ? No activities Optimisation Signaling / user plane
Key Performance indicator Signaling / Traffic RT/NRT
RRC / RAB / CORE
Soc Classification level 7 © Nokia Siemens Networks
Event / Action item / improvement
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Evaluation Failure causes Uu / WBTS / AAL2 / RNC
Indication KPI
Principles of 3G network optimization Quality benchmark Operator can define several KPIs: Blocking rate (e.g. for RRC 0.5%, RT RAB 1%, NRT RAB 0.1%, PS session 5%) Call drop rate (e.g. for RT RAB 0.5%, NRT RAB 2%) Handover success rate (e.g. for SHO 95%, for ISHO 80%) Report statistics generated by vendor MML commands (WBTS, RNC) Evaluated for accessibility, retainability, usage, mobility and integrity (BLER)
Graphical representation of statistics (e.g. NetAct Report Suite) In addition reporting and monitoring by probes
Soc Classification level 8 © Nokia Siemens Networks
RN31571EN30GLA0
Principles of 3G network optimization KPI principle and definition
KPI
Number_of_events_with_desired_result(e.g.successful_call_setups) Number_of_all_events(e.g.all_call_setup_attempts)
KPI counts events Operator must specify target value to evaluate performance Limited qualitative analysis only, as no detailed failure causes Arithmetic mean only, but no discussion of statistical scatter
Soc Classification level 9 © Nokia Siemens Networks
RN31571EN30GLA0
*100%
Principles of 3G network optimization KPI principle and definition The KPIs to be monitored for the RAN could be e.g.
Cell availability Call Setup Success Rate CSSR Packet session setup success rate (NRT, HSDPA, HSUPA) Call Drop rate SHO / ISHO / HSPA serving cell change success rate In NOLS
WCDMA RAN Key Performance Indicators RNC counter description NetAct data base description for RNC measurements Key Performance Indicator Changes Measurement Changes
Soc Classification level 10 © Nokia Siemens Networks
RN31571EN30GLA0
KPI Definition Principles of 3G network optimization Principles of performance measurements and KPI classification KPI construction
Soc Classification level 11 © Nokia Siemens Networks
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Principles of performance measurements RAN KPI classification – according functionality The RAN KPI can be classified into the following categories Accessibility Retainability Usage RAN KPI
Mobility Integrity (BLER)
BS GPRS Backbone
PS data server
3G SGSN
FMT
RNC
Modem
3G MSC PSTN
Soc Classification level 12 © Nokia Siemens Networks
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Firewall
GGSN
CS data server
Internet
Principles of performance measurements Relocation
RNC1 SRNC
RNC2 DRNC
Accessibility: RRC Setup & Access Rate RAB Setup & Access Rate Call Setup Success Rate
Usage: Average UL Load Average DL Load BTS2
UE
BTS1
X Retainability: RRC Drop Rate RAB Drop Rate Soc Classification level 13 © Nokia Siemens Networks
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Mobility: SHO Success Rate SHO Overhead
X Pre-emption
Principles of performance measurements RAN KPI classification – according network element
RNC radio network counter # 1xxx
Soc Classification level 14 © Nokia Siemens Networks
W-BTS counter (HSPA, CE, CQI) 50xx / 51xx
#
AXC counter 52xx
#
RNC PDH counter 1xx
#
RNC signalling counter (SCCP) 2xx
#
RNC ATM /IP transport counter 5xx/8xx
#
RNC DSP counter 6xx
#
RNC multi-controller counter (CPU) # 2xxx RN31571EN30GLA0
New counters and performance measurements RU30 RNC radio network part measurements with new counters new measurements M1000 Cell resource M1001 Service level M1002 Traffic M1003 L3 signaling at Iu M1004 L3 signaling at Iur M1005 L3 signaling at Iub M1006 RRC signaling M1007 Soft handover M1008 Intra-system hard handover M1009 L3 relocation signaling M1010 Inter-system handover M1011 Location services M1012 Service area broadcast M1013 Autodef SHO M1014 Autodef IFHO M1015 Autodef ISHO Soc Classification level 15 © Nokia Siemens Networks
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M1016 RCPM OLPC M1017 RCPM RLC M1018 RCPM UEQ M1021 Iu-PC Interface M1022 Packet call M1023 Cell throughput M1024 RCPM OLPC WCEL M1025 RCPM OLPC RNC M1026 RCPM RLC WCEL M1027 RCPM RLC RNC M1028 Autodef SHO DSR M1031 WBTS Resource M1032 CS Voice HSPA User Plane M1033 CPICH Quality (EC/I0 and RSCP statistics)
New counters and performance measurements RU30 W-BTS part measurements with new counters new measurements M5000 HSPA in WBTS Measurement M5001 WBTS HW Resource Measurement M5002 Cell Throughput in WBTS Measurement M5003 Frame Protocol in WBTS Measurement M5004 Signaling Load in WBTS Measurement M5005 HSPA in WBTS Extension Measurement (number of DC HSPA users, PIC state) M5006 WBTS R99 HW Measurement (CE for R99 and AMR over HSPA) M5101 FTM PDH Interface Measurement M5102 FTM SDH Interface Measurement M5105 FTM ATM Interface Measurement M5106 FTM ATM VC Connection Measurement M5107 FTM ATM VC Connection Measurement M5110 FTM Ethernet Link Measurement M5113 FTM Pseudowire MPLS Measurement M5114 FTM PSN Tunnel IP Measurement
Soc Classification level 16 © Nokia Siemens Networks
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New counters and performance measurements RU30 W-BTS part measurements with new counters new measurements M5115 AAL2 Scheduling Performance in BTS Measurement M5116 FTM Timing over Packet Measurement M5117 FTM IP Statistics Measurement M5118 FTM PHB Statistics Measurement M5119 FTM CES over PSN Interface Measurement M5120 FTM CES over PSN pseudowire tunnel Measurement M5121 FTM CES over PSN Pseudowire Measurement M5122 FTM IPSec Measurement M5123 FTM VLAN PHB Statistics Measurement M5124 FTM VLAN IP Statistics Measurement M5125 FTM VLAN Statistics Measurement M5126 FTM TWAMP Statistics Measurement M5127 PPP Multi Link Statistics Measurement M5128 PPP Single Link Statistics Measurement
Soc Classification level 17 © Nokia Siemens Networks
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New counters and performance measurements RU30 RNC transport and HW part 145 208 209 210 211 212 213 214 215 216 217 218 219 513 514 516 528 529 530 531 532 533 546 547 548 549
measurements with new counters new measurements
PDH Statistics MTP Signalling link availability MTP signalling link performance MTP signalling link utilization MTP signalling point status MTP Signalling link set and route set availability MTP Signalling traffic report of signalling points MTP Signalling traffic report of user parts MTP matrix signalling traffic SCCP signalling point SCCP subsystem SCCP local subsystem availability SCCP single meters STM-1 Interface IMA Logical Interface SONET/SDH Protection Group meas ATM layer performance ATM Virtual Path Connection ATM Virtual Channel Connection ATM Route Load ATM Interface ATM VCC Bundle SAAL signalling protocol at UNI AAL5 Protocol Measurement in DMX AAL2 signalling protocol at UNI AAL5 Protocol Meas. in CHORUS
Soc Classification level 18 © Nokia Siemens Networks
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New counters and performance measurements RU30 RNC transport and HW part 550 552 553 563 564 565 566 567 568 592 594 608 609 610 612 615 617 661 800 801 802 803 804 2002 2004 2007
AAL2 path CAC resource AAL2 signalling at NNI AAL2 Scheduling Performance in RNC TCP/IP Protocol Ethernet Interface Performance IP measurement on IP interface UDP measurement on IP interface IP QoS measurement IP Based Route measurement Unit Load WAC overload control Availability Performance DSP service statistics L2 Resource Utilization (multi-controller) DSP state changes DSP Resource Utilization DSP load M3UA Association Set AAL2 Resource Reservation Iu-PS Performance RNC capacity usage RNC RTP/RTCP RNC IP CAC CPU Usage (multi-controller) Networking Logical (multi-controller) Node Level CPU load (multi-controller)
Soc Classification level 19 © Nokia Siemens Networks
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measurements with new counters new measurements
Principles of performance measurements New performance measurement features RU30 Performance monitoring
Feature Number
Automatic object list update
RAN1438
User management for online monitoring
RAN2290
Soc Classification level 20 © Nokia Siemens Networks
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Principles of performance measurements New HW and SW features in RU30
RAN
New Feature
RAN1912
MIMO and 64QAM
RAN1907
Dual cell HSDPA with MIMO and 64QAM
RAN1269
4Rx diversity
RAN1575
Flexi 3 sector RF module 1900 MHz
RAN1637
HS Cell_FACH on DL
RAN1911
Enhanced serving cell change
RAN2172
Multi band load balancing and blind inter-frequency HO
RAN2171
Dynamic HSDPA BLER
RAN1308
HSUPA interference cancellation receiver
RAN1702
Frequency domain equalizer
Soc Classification level 21 © Nokia Siemens Networks
RN31571EN30GLA0
KPI Definition Principles of 3G network optimization Principles of performance measurements and KPI classification KPI construction - KPI Factors - Access and setup
- Drop (Retainability)
- Mobility -Throughput
Soc Classification level 22 © Nokia Siemens Networks
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KPI factors Factors affecting KPIs
BTS, RNC, PS Core, CS Core performance
Performance of UE and field measurement tools
IMPACT of network performance Quality of network implementation Quality of network operation and maintenance
Soc Classification level 23 © Nokia Siemens Networks
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Application servers, IP backbone performance
KPI factors Factors affecting KPIs Many factors and network elements can affect network performance, e.g. Quality of network equipment, both hardware and software (BTS, RNC, PS and CS core, transmission equipment) Performance of UE and field measurement tools (inter-operability, sensitivity of measurement parameters, level of accuracy) Quality of network planning and optimization (coverage, interference, parameter tuning, capacity dimensioning, site acquisition) Quality of network implementation (site and network equipment installation, integration and commissioning) Quality of network operation and maintenance Multi-vendor environment (application servers, IP backbone, core versus RAN)
Measurement method (test setup, service dependency, cluster or system level, clutter type)
Soc Classification level 24 © Nokia Siemens Networks
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KPI factors UE impact on performance
UE power consumption UE power spiking UE Sensitivity
RNC
W-BTS
Power control RACH process
Server UE UE IP configuration Support of robust IP header compression
Soc Classification level 25 © Nokia Siemens Networks
UE Measurement performance Cell reselection UE feature support SHO Cell_PCH Relocation 64 QAM Inter-RAT mobility MIMO Dual cell HSPA RN31571EN30GLA0
KPI factors UE impact on performance The functionalities of different UEs are not similar, there are differences in Power control and RACH process SRNC relocation support Cell FACH/PCH performance Cell reselection and inter-RAT mobility Throughput (e.g. during SHO) UE power consumption UE power spiking UE Measurement performance (cell reselection, Cell_DCH, ISHO) UE Sensitivity Data card throughput Malfunctioning of certain UEs will naturally cause drops in setup or active phase
Soc Classification level 26 © Nokia Siemens Networks
RN31571EN30GLA0
KPI Definition Principles of 3G network optimization Principles of performance measurements and KPI classification KPI construction - KPI Factors - Access and setup
- Drop (Retainability)
- Mobility -Throughput
Soc Classification level 27 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – RRC setup Definition RRC connection (service level measurements M1001) UE
BTS
RNC
CN
RRC: Connection Request RRC Connection Setup phase Resource Reservation in RNC, BTS, Transmission RRC: Connection Setup RRC Connection Access phase RNC waits reply from UE
RRC: Connection Setup Complete
Soc Classification level 28 © Nokia Siemens Networks
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RRC setup success rate
KPI construction – RRC setup RRC setup success rate (voice) RRC_setup_ success_rate
attempts_for_RRC_voi ce_connection_setups failures_o f_RRC_voic e_connection_setups attempts_for_RRC_voi ce_connection_setups
Σ MOC_CONV_CALL_ATTS MOC_CONV_CALL_FAILS MTC_CONV_CALL_ATTS MTC_CONV_CALL_FAILS EMERGENCY_ CALL_ATTS EMERGENCY_ CALL_FAILS RRC_ACC_RE L_EMERGENCY RRC_ACC_RE L_MO_CONV RRC_ACC_RE L_MT_CONV RRC_setup_success_rate Σ MOC_CONV_CALL_ATTS MTC_CONV_CALL_ATTS EMERGENCY_ CALL_ATTS RRC_ATT_REP_MO_CONV RRC_ATT_REP_MT_CONV RRC_ATT_REP_EMERGENCY RRC_ACC_RE L_EMERGENCY RRC_ACC_RE L_MO_CONV RRC_ACC_RE L_MT_CONV RRC_CONN_STP_REJ_EMERG_CALL
REP = repetitive attempt due to RRC connection reject NOT treated as fault, if user finally gets service Emergency calls redirected to GSM
Soc Classification level 29 © Nokia Siemens Networks
RN31571EN30GLA0
REL = cell reselection during setup UE does not respond to RNC in 1st cell But requests service again in 2nd cell
KPI construction – RRC setup RRC setup success rate (NRT) Σ MOC_INTER_CALL_ATTS MOC_INTER_CALL_FAILS MOC_BACKG_ CALL_ATTS MOC_BACKG_ CALL_FAILS MTC_INTER_CALL_ATTS MTC_INTER_CALL_FAILS MTC_BACKG_ CALL_ATTS MTC_BACKG_ CALL_FAILS MOC_HIGH_PRIOR_SIGN_ATTS - MOC_HIGH_PRIOR_SIGN_FAILS MTC_HIGH_PRIOR_SIGN_ATTS - MTC_HIGH_PRIOR_SIGN_FAILS RRC_ACC_RE L_MO_INTER RRC_ACC_RE L_MO_BACKG RRC_ACC_RE L_MT_INTER RRC_ACC_RE L_MT_BACKG RRC_ACC_RE L_MO_HIGH_PR_SIGN - RRC_ACC_RE L_MT_HIGH_PR_SIGN RRC_setup_success_rate Σ MOC_INTER_CALL_ATTS MOC_BACKG_ CALL_ATTS MOC_HIGH_PRIOR_SIGN_ATTS MTC_HIGH_PRIOR_SIGN_ATTS MTC_INTER_CALL_ATTS MTC_BACKG_ CALL_ATTS RRC_ATT_REP_MO_INTER RRC_ATT_REP_MT_INTER RRC_ATT_REP_MO_HIGH_PR_SIGN - RRC_ATT_REP_MT_HIGH_PR_SIGN RRC_ATT_REP_MO_BACKG RRC_ATT_REP_MT_BACKG RRC_ACC_RE L_MO_INTER RRC_ACC_RE L_MO_BACKG RRC_ACC_RE L_MT_INTER RRC_ACC_RE L_MT_BACKG RRC_ACC_RE L_MO_HIGH_PR_SIGN - RRC_ACC_RE L_MT_HIGH_PR_SIGN
Analogue to voice Includes interactive, background and high priority signaling services Does not include emergency calls Soc Classification level 30 © Nokia Siemens Networks
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KPI construction – RRC setup RRC setup success rate (example)
Typical target for RRC setup success rate 99.5% Soc Classification level 31 © Nokia Siemens Networks
Little resources needed High processing RN31571EN30GLA0 gain due to SF256 / SF128 on DL / UL for SRB
KPI construction – RAB setup Definition RAB connection (service level measurements M1001) UE
BTS
RNC
CN
RRC: Initial Direct Transfer (service request) Direct transfer (Call Proceeding)
RANAP: Initial UE Message RANAP: RAB Assignment Request
RAB Connection Setup phase Resource Reservation in RNC, BTS, Transmission
RAB setup success rate
RRC: Radio Bearer Setup RAB Connection Access phase RNC waits reply from UE RRC: Radio Bearer Setup Complete RANAP: RAB Assignment Response Direct transfer (Alerting) Direct transfer (Connect) Direct transfer (Connect Acknowledge) Soc Classification level 32 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – RAB setup RAB setup success rate (voice)
successful_voice_RAB_establishments RAB_setup_success_rate attempts_for_voice_RAB_establishments RAB_ACC_CO MP_CS_VOIC E RAB_setup_success_rate RAB_STP_AT T_CS_VOICE
Soc Classification level 33 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – RAB setup RAB setup success rate (NRT)
RAB_ACC_CO MP_PS_INTER RAB_ACC_CO MP_PS_BACKG RAB_setup_success_rate RAB_STP_AT T_PS_INTER RAB_STP_AT T_PS_BACKG Analogue to voice Includes interactive and background services
High priority signaling services have on RAB level traffic class background
Soc Classification level 34 © Nokia Siemens Networks
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KPI construction – RAB setup RAB setup success rate (example)
Typical target for voice RAB setup success rate 99% Soc Classification level 35 © Nokia Siemens Networks
Little additional resources beyond RRC needed Still highRN31571EN30GLA0 processing gain due to SF128 / SF64 on DL / UL for RB
KPI construction – RAB setup RAB setup success rate (example)
Typical target for NRT RAB setup success rate 99.9% Soc Classification level 36 © Nokia Siemens Networks
Hardly any additional resources beyond RRC needed RN31571EN30GLA0 RAB setup with DCH0/0, i.e. only signaling, no service allocation
KPI construction – call setup success rate CSSR = RRC setup SR
* RNC
UE
Core
UE Service Request
RRC: Connection Request RRC: Connection Setup
Both setup phases must be successful
RAB setup SR
+
RRC: Connection Setup
RANAP RAB assignment Procedure between core and RNC
Complete
attempts_for_RRC_voice_connection_setups failures_of_RRC_voice_connection_setups successful_voice_RAB_establishments AMR_CSSR * attempts_for_RRC_voice_connection_setups attempts_for_voice_RAB_establishments For NRT call analogue treatment
Soc Classification level 37 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – call setup success rate Possible causes of low CSSR Poor coverage or dominance or interference issues in radio interface Capacity issues in radio or Iub interface Configuration issues in WBTS (parameters or HW) CSSR covers all the following steps Initial RRC connection request of the UE to the network
RRC setup phase RAB setup phase, until user data is starting to get transferred
Soc Classification level 38 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – packet session setup Definition packet session setup (packet call measurements M1022) UE
BTS
RNC
UE in Cell_FACH or with DCH 0/0 RRC: Capacity Request PS Session Setup phase Resource Reservation in RNC, BTS, Transmission RRC: Radio Bearer Reconfiguration PS Session Access phase RNC waits reply from UE RRC: Radio Bearer Reconfiguration Complete UE in Cell_DCH with data rate > 0 kbit/s (R99 or HS)
Soc Classification level 39 © Nokia Siemens Networks
RN31571EN30GLA0
PS session setup success rate
KPI construction – packet session setup R99 packet session setup success rate
successful_PS_DCH_al locations PS_SSSR attempts_for_PS_DCH_ allocation s RAB established PS decides about Cell_DCH or Cell_FACH
D_D_REQ_D_D_ALLO_INT +
PS_SSSR
D_D_REQ_D_D_ALLO_BGR PS_ATT_DCH_DCH_INT +
PS_ATT_DCH_DCH_BGR
Request in DL: DCH
*100%
Allocated in DL: DCH
Request in UL: DCH
Allocated in UL: DCH
KPI contains interactive and background, but not PS streaming and conversational services
Soc Classification level 40 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – packet session setup R99 packet session setup success rate (example)
Typical target for packet session SSR 90% / 95% for data rate > / ≤ 64 kbps High amount of resources needed especially for high data rate Low processing gain especially for high data rate due to SF8 / SF4 on DL / UL
Soc Classification level 41 © Nokia Siemens Networks
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KPI construction – packet session setup HSDPA session setup success rate HSDPA_Setu p_SR
successful_HS_DSCH_a llocations attempts_for_HS_DSCH _allocatio ns
RAB established PS decides about HS-DSCH, DCH or FACH HS_E_REQ_HS_E_ALLO_STRE HS_E_REQ_HS_E_ALLO_INT + HS_E_REQ_HS_E_ALLO_BGR
HS_E_REQ_HS_D_ALLO_STRE HS_E_REQ_HS_D_ALLO_INT HS_E_REQ_HS_D_ALLO_BGR HSPDA_Setup_SS
HS_D_REQ_HS_D_ALLO_STRE HS_D_REQ_HS_D_ALLO_INT + HS_D_REQ_HS_D_ALLO_BGR PS_ATT_HSDSCH_EDCH_S TRE PS_ATT_HSDSCH_EDCH_I NT + PS_ATT_HSDSCH_EDCH_B GR
PS_ATT_HSDSCH_DCH_STRE PS_ATT_HSDSCH_DCH_INT + PS_ATT_HSDSCH_DCH_BG R
Three combinations • HSDPA + HSUPA requested → both allocated • HSDPA + HSUPA requested → at least HSDPA allocated • HSDPA requested only → HSDPA allocated KPI contains streaming, interactive and background service An analogue KPI for conversational service does not exist Soc Classification level 42 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – packet session setup HSDPA session setup success rate (example)
Typical target for HSDPA session setup success rate 90% Soc Classification level 43 © Nokia Siemens Networks
HSDPA session setup more often successful than R99 packet session setup For HSDPA guarantee of 5 codes and reservation of CEs per packet scheduler RN31571EN30GLA0
KPI construction – packet session setup HSUPA session setup success rate HSUPA_Setu p_SR
successful_E DCH_alloca tions attempts_for_E DCH_alloca tions
RAB established PS decides about HS-DSCH, E-DCH, DCH or FACH
HSUPA_Setup_SS
HS_E_REQ_HS_E_ALLO_STRE HS_E_REQ_HS_E_ALLO_INT + HS_E_REQ_HS_E_ALLO_BGR PS_ATT_HSDSCH_EDCH_S TRE PS_ATT_HSDSCH_EDCH_INT + PS_ATT_HSDSCH_EDCH_BGR
One combination only HSDPA + HSUPA requested → both allocated KPI contains streaming, interactive and background service
Soc Classification level 44 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – packet session setup HSUPA session setup success rate (example)
Typical target for HSUPA session setup success rate 90% Soc Classification level 45 © Nokia Siemens Networks
RN31571EN30GLA0
KPI Definition Principles of 3G network optimization Principles of performance measurements and KPI classification KPI construction - KPI Factors - Access and setup
- Drop (Retainability)
- Mobility -Throughput
Soc Classification level 46 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – call drop rate Types of drops UE
BTS
Radio link drop Soft drop, RRC or RAB connection might still survive
RRC drop Hard drop, all RAB drop as well
RAB drop Hard drop, but RRC connection might still survive
RAB drop = call drop
Soc Classification level 47 © Nokia Siemens Networks
RN31571EN30GLA0
RNC
CN
KPI construction – call drop rate Call drop rate (service level measurements M1001)
CDR
releases_due_to_failures normal_releases releases_due_to_failures
Dropped calls = calls which do not terminate due to one of the following reasons • Normal release • Relocation • Preemption Possible causes for call drops are e.g. • Lack of coverage • Interference • SHO failure • Missing neighbor • Relocation failure
Soc Classification level 48 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – call drop rate Call drop rate for voice Σ RAB_ACT_RE L_CS_VOICE_P_EMP RAB_ACT_FAIL_CS_VOICE_IU RAB_ACT_FAIL_CS_VOICE_RADIO RAB_ACT_FAIL_CS_VOICE_BTS RAB_ACT_FAIL_CS_VOICE_IUR RAB_ACT_FAIL_CS_VOICE_RNC RAB_ACT_FAIL_CS_VOICE_UE CDR_voice Σ RAB_ACT_CO MP_CS_VOICE RAB_ACT_RE L_CS_VOICE_SRNC RAB_ACT_RE L_CS_VOICE_P_EMP RAB_ACT_RE L_CS_VOICE_HHO RAB_ACT_RE L_CS_VOICE_ISHO RAB_ACT_RE L_CS_VOICE_GANHO RAB_ACT_FAIL_CS_VOICE_IU RAB_ACT_FAIL_CS_VOICE_RADIO RAB_ACT_FAIL_CS_VOICE_BTS RAB_ACT_FAIL_CS_VOICE_IUR RAB_ACT_FAIL_CS_VOICE_RNC RAB_ACT_FAIL_CS_VOICE_UE
KPI considers cell where call terminates Call might have been started in another cell Preemption treated as drop, as user looses service
Soc Classification level 49 © Nokia Siemens Networks
RN31571EN30GLA0
Preemption Drops Normal release Relocation / preemption IFHO ISHO to GSM / WLAN Drops
KPI construction – call drop rate Call drop rate for voice (example)
Typical target for voice call drop rate 0.5% Soc Classification level 50 © Nokia Siemens Networks
CS call drop rate usually lower than PS one due to larger cell range and bigger SHO overhead RN31571EN30GLA0
KPI construction – call drop rate Call drop rate for NRT RAB_ACT_FAIL_PS_INTER_IU RAB_ACT_FAIL_PS_INTER_RADIO RAB_ACT_FAIL_PS_INTER_BTS RAB_ACT_FAIL_PS_INTER_IUR RAB_ACT_FAIL_PS_INTER_RNC RAB_ACT_FAIL_PS_INTER_UE RAB_ACT_FAIL_PS_BACKG_IU RAB_ACT_FAIL_PS_BACKG_RADIO RAB_ACT_FAIL_PS_BACKG_BTS RAB_ACT_FAIL_PS_BACKG_IUR RAB_ACT_FAIL_PS_BACKG_RNC RAB_ACT_FAIL_PS_BACKG_UE RAB_ACT_FAIL_PS_BACKG_PCH RAB_ACT_FAIL_PS_INTER_PCH CDR_NRT RAB_ACT_CO MP_PS_INTER RAB_ACT_CO MP_PS_BACKG RAB_ACT_RE L_PS_INTER_SRNC RAB_ACT_RE L_PS_BACKG _SRNC RAB_ACT_FAIL_PS_INTER_IU RAB_ACT_FAIL_PS_BACKG_IU RAB_ACT_FAIL_PS_INTER_RADIO RAB_ACT_FAIL_PS_BACKG_RADIO RAB_ACT_FAIL_PS_INTER_BTS RAB_ACT_FAIL_PS_BACKG_BTS RAB_ACT_FAIL_PS_INTER_IUR RAB_ACT_FAIL_PS_BACKG_IUR RAB_ACT_FAIL_PS_INTER_RNC RAB_ACT_FAIL_PS_BACKG_RNC RAB_ACT_FAIL_PS_INTER_UE RAB_ACT_FAIL_PS_BACKG_UE
No preemption for NRT calls No inter-RAT mobility considered for NRT calls KPI considers drop of active RAB only If non active RAB drops, both standard failure counters and RAB_ACT_FAIL_PS_XX_PCH counters are updated Soc Classification level 51 © Nokia Siemens Networks
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Drops interactive
Drops background Drops în Cell/URA_PCH Normal release Relocation
Drops
KPI construction – call drop rate Call drop rate for NRT (example)
Typical target for NRT call drop rate 2% Soc Classification level 52 © Nokia Siemens Networks
PS call drop rate usually higher than CS one due to higher RSCP requirements and lower SHO overhead RN31571EN30GLA0
KPI construction – call drop rate HSDPA retainability (traffic measurements M1002) normal_HSDPA_releases HSDPA_session_SR normal_HSDPA_release s HSDPA_releases_due_to_failures
HSDPA_drop_rate 1 HSDPA_session_SR HSDPA retainability deals with transition from HS-DSCH to DCH or FACH, not with release of HS RAB Causes for normal transitions are • Inactivity • Preemption • Mobility to non HS cell If a failure occurs, the RNC tries to shift the user to Cell_FACH, i.e. to keep the RRC and RAB connection running HSDPA drop thus is soft drop
Soc Classification level 53 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – call drop rate HSDPA retainability HSDPA_session_SR
Σ REL_ALLO_NORM_HS_DSCH_INT REL_ALLO_NORM_HS_DSCH_BGR Σ REL_ALLO_NORM_HS_DSCH_INT REL_ALLO_NORM_HS_DSCH_BGR REL_ALLO_OTH_FAIL_HSDSCH_INT REL_ALLO_OTH_FAIL_HSDSCH_BGR REL_ALLO_RL_FAIL_HS_DSCH_INT REL_ALLO_RL_FAIL_HS_DSCH_BGR
Two types of failure counter given only • Radio link failure • Other failure
An analogue KPI can be defined for streaming service An analogue KPI for conversional service does not exist
Soc Classification level 54 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – call drop rate HSDPA retainability
Typical target for HSDPA drop rate 1% Soc Classification level 55 © Nokia Siemens Networks
HSDPA usually more robust than R99 as more power available for the radio link RN31571EN30GLA0
KPI Definition Principles of 3G network optimization Principles of performance measurements and KPI classification KPI construction - KPI Factors - Access and setup
- Drop (Retainability)
- Mobility -Throughput
Soc Classification level 56 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – SHO success rate Definition SHO success rate (SHO measurements M1007) UE
BTS
RNC
RRC: Measurement Report (Event 1A / 1B / 1C) Setup phase Resource Reservation in RNC, BTS, Transmission (only Event 1A / 1C) RRC: Active Set Update Access phase RNC waits reply from UE RRC: Active Set Update Complete
Soc Classification level 57 © Nokia Siemens Networks
RN31571EN30GLA0
SHO success rate
KPI construction – SHO success rate SHO success rate successful_active_set_updates SHO_success_rate addition_requests_1a drop_requests_1b replacemen t_requests_1c KPI checks reliability of SHO only Problems like cell overlap or specific adjacencies discussed later Attempt and success counted in all source cells
CELL A
CELL C CELL B
Soc Classification level 58 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – SHO success rate SHO success rate SHO_Success_Rate
SUCC_UPDAT ES_ON_SHO_FOR_RT SUCC_UPDAT ES_ON_SHO_FOR_NRT CELL_ADD_REQ_ON_SHO_FOR_RT CELL_REPL_REQ_ON_SHO_FOR_RT CELL_DEL_REQ_ON_SHO_FOR_RT CELL_ADD_REQ_ON_SHO_FOR_NRT CELL_REPL_REQ_ON_SHO_FOR_NRT CELL_DEL_REQ_ON_SHO_FOR_NRT
Number of successful active set updates in comparison to initial addition / deletion / replacement requests Periodic reports are excluded (can occur e.g. in case of busy RNC not reacting immediately to initial request)
Soc Classification level 59 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – SHO success rate SHO success rate (example)
RT
NRT
Typical target for SHO success rate 95% Soc Classification level 60 © Nokia Siemens Networks
CS more robust against low coverage / quality at cell edge than PS Therefore higher SHO success rate RN31571EN30GLA0
KPI construction – ISHO success rate Definition ISHO success rate (ISHO measurements M1010) UE
BTS
RNC
MSC
RRC: Measurement Report (Event 1F) RRC: Physical Channel Reconfiguration RRC: Physical Channel Reconfiguration Complete
UE put into compressed mode
RRC: Measurement Control RxLev measurements
RRC: Measurement Report RRC: Measurement Control
ISHO success rate
BSIC verification
RRC: Measurement Report
RANAP Relocation required RANAP Relocation command
RRC: HO from UTRAN Command Soc Classification level 61 © Nokia Siemens Networks
RN31571EN30GLA0
ISHO attempt
KPI construction – ISHO success rate ISHO success rate
ISHO_success_rate
successful_ISHOs attempts_for_ISHOs
ISHO divided into two phases • Inter-system measurements • Inter-system handover execution • Attempt and success counted in all source cells RT and NRT ISHO differ in nature Counter and KPI are implemented separately for RT and NRT In case of multi-RAB with at least one RT RAB counted as RT ISHO ISHO may fail due to e.g. • Missing target cell • Target cell has not enough coverage • Target cell strongly interfered • Configuration problem Soc Classification level 62 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – ISHO success rate ISHO per trigger Attempt and success not only counted per RT / NRT, but also per trigger •UL SIRTarget •UL UE power (event 6A) •DL RL power •CPICH RSCP (event 1F) •CPICH Ec/I0 (event 1F) •IMSI based •Emergency call •Load based RTWP •Load based TCP •Load based HW / logical resources •Load based code resources •Services based
Soc Classification level 63 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – ISHO success rate ISHO success rate RT Σ SUCC_IS_HHO_UL_DCH_Q _RT SUCC_IS_HHO_UE_TRX_PWR_RT SUCC_IS_HHO_DL_DPCH_PWR_RT SUCC_IS_HHO_CPICH_RSCP_RT SUCC_IS_HHO_CPICH_ECNO_RT SUCC_IS_HHO_IM_IMS_RT SUCC_IS_HHO_EMERG_CALL SUCC_IS_HHO_LB_CAPA_ DL_RT SUCC_IS_HHO_LB_CAPA_ UL_RT SUCC_IS_HHO_LB_PRX_TOT_RT SUCC_IS_HHO_LB_PTX_TOT_RT SUCC_IS_HHO_LB_RES_LIM_RT SUCC_IS_HHO_LB_RSVR_ SC_RT SUCC_IS_HHO_SB_RT SUCC_IS_HHO_WPS_RT SUCC_GANHO _AMR_RT SUCC_ISHO_CELL_SHUTD OWN_RT SUCC_ISHO_CELL_BLOCK _RT ISHO_Success_RT IS_HHO_ATT_UL_DCH_Q_ RT IS_HHO_ATT_UE_TRX_PWR_RT IS_HHO_ATT_DPCH_PWR_RT IS_HHO_ATT_CPICH_RSCP_RT IS_HHO_ATT_CPICH_ECNO_RT IS_HHO_ATT_IM_IMS_RT IS_HHO_ATT_EMERG_CAL L IS_HHO_ATT_LB_CAPA_D L_RT IS_HHO_ATT_LB_CAPA_U L_RT IS_HHO_ATT_LB_PRX_TOT_RT IS_HHO_ATT_LB_PTX_TOT_RT IS_HHO_ATT_LB_RES_LIM_RT IS_HHO_ATT_LB_RSVR_S C_RT IS_HHO_ATT_SB_RT IS_HHO_ATT_UL_DCH_WP S_RT ATT_GANHO_AMR_RT ATT_ISHO_CELL_SHUTDO WN_RT ATT_ISHO_CELL_BLOCK_ RT
Analogue for NRT For NRT no ISHO of emergency call, of WPS user and no ISHO to GAN Soc Classification level 64 © Nokia Siemens Networks
RN31571EN30GLA0
Success counter updated, if relocation from RNC to BSC successful
Attempt counter updated, if measurements successful, i.e. GSM cell with sufficient RxLev and readable BSIC available
KPI construction – ISHO success rate ISHO success rate (example)
RT
NRT
Typical target for ISHO success rate 90%/80% for RT/NRT Soc Classification level 65 © Nokia Siemens Networks
CS more robust against low coverage / quality at cell edge than PS Therefore higher ISHO success rate RN31571EN30GLA0
KPI construction – serving cell change success rate Definition SCC success rate (intra-system HHO measurements M1008) UE
BTS Source
RNC
BTS Target
RRC: Measurement Report (e.g. Ec/Io) NBAP Radio Link Reconfiguration Procedure NBAP Radio Link Reconfiguration Procedure
Setup phase Resource Reservation in RNC, BTS, Transmission
RRC: Radio Bearer Reconfiguration Access phase RNC waits reply from UE RRC: Radio Bearer Reconfiguration Complete
Soc Classification level 66 © Nokia Siemens Networks
RN31571EN30GLA0
SCC success rate
KPI construction – serving cell change success rate Definition SCC success rate (intra-system HHO measurements M1008) SCC_success_rate
SCC_INTRA_BTS_SUCCES SFUL SCC_INTER_ BTS_SUCCES SFUL SCC_STARTED_CPICH_ECNO SCC_STARTED_UL_SIR_ERROR SCC_STARTED_ACTIVE_SET_UPD SCC_STARTED_OTHER_RE ASON
Attempt counted per trigger in source cell •CPICH Ec/I0 •UL SIR error •Active set update •Other reason Success counted in target cell •Intra BTS target •Inter BTS target (data in source BTS buffer lost)
Soc Classification level 67 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – serving cell change success rate SCC success rate (example)
Typical target for serving cell change success rate 95% Soc Classification level 68 © Nokia Siemens Networks
RN31571EN30GLA0
KPI Deifnition Principles of 3G network optimization Principles of performance measurements and KPI classification KPI construction - KPI Factors - Access and setup
- Drop (Retainability)
- Mobility -Throughput
Soc Classification level 69 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – cell throughput R99 throughput sent / received by RNC on DL / UL per cell (cell throughput measurements M1023) R99 NRT DL MAC - d AverageThroughput at RNC
NRT_DCH_DL_DATA_VOL 8
R99 NRT UL MAC - d AverageThroughput at RNC
NRT_DCH_UL _DATA_VOL 8
Transmission of MAC-d PDUs over DCH Counter give data volume in byte KPI give throughput in Kbit/s
Soc Classification level 70 © Nokia Siemens Networks
RN31571EN30GLA0
1000 PERIOD_DURATION 60
1000 PERIOD_DURATION 60
KPI construction – cell throughput HSPA throughput sent / received by RNC on DL / UL per cell (cell throughput measurements M1023) HSDPA MAC - d AverageThroughput at RNC
HSUPA MAC - es AverageThroughput at RNC
HS_DSCH_DATA_VOL 8
1000 PERIOD_DURATION 60
NRT_EDCH_H SDPA_UL_DATA_VOL 8 1000 PERIOD_DURATION 60
Transmission of MAC-d / MAC-es PDUs over HS-DSCH / E-DCH Counter give data volume in byte KPI give throughput in Kbit/s
Soc Classification level 71 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – BTS throughput HSDPA throughput arriving at / transmitted by BTS (HSPA in BTS measurements M5000)
RECEIVED_HS_MACD_BITS Arriving_throughput 1000 PERIOD_DURATION 60
Transmitted_throughput
RECEIVED_HS_MACD_BITS -DISCARDED_HS_MACD_BITS 1000 PERIOD_DURATION 60
Arrival and transmission of MAC-d PDUs over HS-DSCH Counter gives data volume in Kbit KPI give throughput in Mbit/s Discarded due to buffer overflow
Soc Classification level 72 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – layer 1 re-transmission Transmission rate (HSPA in BTS measurements M5000) Transmission_rate
(n 1)number_of_MACd_PDUs_delivered_correctly_with_n_retransmissions n
number_of_transmitted_MACd_PDUs
Example 100 PDUs with no re-transmission 16 PDUs with 1 re-transmission 3 PDUs with 2 re-transmissions 1 PDU with 3 re-transmissions Transmission rate = (100 * 1 + 16 * 2 + 3 * 3 + 1 * 4) / (100 + 16 + 3 + 1) Transmission rate = 145 / 120 = 1.21 1.21 transmissions over the air for 1 PDU 21% re-transmission overhead
Soc Classification level 73 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – layer 1 re-transmission Transmission rate CL 0 = Number of packets with ACK immediately
CL 1..5 Number of packets with ACK after 1..5 re-transmissions MAC_HS_PDU_RETR_DIST_CL_0 MAC_HS_PDU_RETR_DIST_CL_1
MAC_HS_PDU_RETR_DIST_CL_2
MAC_HS_PDU_RETR_DIST_CL_3 MAC_HS_PDU_RETR_DIST_CL_ 4 MAC_HS_PDU_RETR_DIST_CL_5 ORIG_TRANS_1_CODE_QPSK ... ORIG_TRANS_15_CODE_QPSK
Transmission_rate
ORIG_TRANS_1_CODE_16QAM ... ORIG_TRANS_15_CODE_16QAM ORIG_TRANS_10 _CODE_64QAM ... ORIG_TRANS_15_CODE_64QAM
RETRANS_1_CODE_QPSK ...
RETRANS_15_CODE_QPSK
RETRANS_1_CODE_16QAM ... RETRANS_15_CODE_16QAM RETRANS_10 _CODE_64QAM ... RETRANS_15_CODE_64QAM
ORIGTRANS = number of packets with original data per number of codes and modulation RETRANS = number of packets with re-transmitted data per number of codes and modulation
Soc Classification level 74 © Nokia Siemens Networks
RN31571EN30GLA0
KPI construction – layer 1 re-transmission Re-transmission overhead (example)
Typical target for re-transmission overhead 10% Too high or too low re-transmissions reduce system capacity Soc Classification level 75 © Nokia Siemens Networks
RN31571EN30GLA0
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