GSM KPI

1. Drive Survey Analysis Process Diagram
Drive test Data
Scran Drive test
data
RNC Counters
RNC Parameters
Data loaded into
software tool
KPI reports per
route
KPI report failure
analysis
Weekly report

2. Overview of 3G KPI
• 3G KPIs are basically divided into the following scopes:
– Field Measurement KPI
– RAN KPI
– Core Network KPI
– End-to-End KPI
BS
RNC 3G MSC
3G SGSN
GGSN Firewall
FMT
GPRS
Backbone
Internet
PS data
server
PSTN
CS data
serverModem
Field Measurement
KPI
RAN KPI
Core Network
KPI
End-to-End
KPI

3. Factors Affecting Network
Performance
• Many factors and network elements can affect the network performance.
Here are some of the main examples:
– Quality of network equipment, both hardware and software – BTS,
RNC, PS Core, CS Core and transmission equipment
– Performance of UE and field measurement tools – inter-operability,
sensitivities of measurement parameters, level of accuracy
– Quality of network planning and optimisation – coverage,
interference, parameter tuning, capacity dimensioning
– 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
– Measurement method – test setup, service dependent, cluster or
system level, area type (dense urban, urban, suburban, rural).

4. Field Measurement KPI• Coverage
KPI Class Indicates Formula
CPICH RSCP >= xx dBm with yy % probability 100*(nbr_of_samples_rscp_>=_xxdBm)/(tot_nbr_of_samples)
CPICH Ec/No >= xx dB with yy % probability 100*(nbr_of_samples_ecno_>=_xxdB)/(tot_nbr_of_samples)
Coverage (per
area type)
KPI Class Indicates Formula
Call Setup Success Ratio, Voice [%] 100*(nbr_of_successful_call_setup_att_voice)/(nbr_of_call_setup_att_voice)
Service Setup Success Ratio, RT Service Other Than Voice [%]
100*(nbr_of_successful_call_setup_att_rt_service)/(nbr_of_call_setup_att_rt_serv
ice)
Service Setup Success Ratio, NRT Service [%]
100*(nbr_of_successful_call_setup_att_nrt_service)/(nbr_of_call_setup_att_nrt_s
ervice)
Call Setup Delay, Voice [sec] Average(call_setup_delay_voice)
Service Setup Delay, RT Service Other Than Voice [sec] Average(call_setup_delay_rt_service)
Service Setup Delay, NRT Service [sec] Average(call_setup_delay_nrt_service)
Accessibility
Accessibility
KPI Class Indicates Formula
Call Complete Ratio, Voice [%] 100*(nbr_of_normal_rel_call_voice)/(nbr_of_successful_call_setup_att_voice)
Service Complete Ratio, RT Service Other Than Voice [%]
100*(nbr_of_normal_rel_call_rt_service)/(nbr_of_successful_call_setup_att_rt_se
rvice)
Service Complete Ratio, NRT Service [%]
100*(nbr_of_normal_rel_call_nrt_service)/(nbr_of_successful_call_setup_att_nrt_
service)
Retainability
Retainability
KPI Class Indicates Formula
Effective Bandwidth, NRT Service [kbit/s] Average(allocated_bw_over_data_session_period)
Average Throughput, NRT Service [kbit/s] Average(downloaded_data_kbit/data_session_period)
Average Round Trip Delay, NRT Service [msec] Average(rtd_32bytes)
Mobility Soft Handover Success Ratio [%] 100*(nbr_of_asu_comp)/(nbr_of_asu)
Service Quality
Service Quality & Mobility

5. 98.50 Call Setup SuccessRate AMR(%) 99.0
98.00 Call Setup SuccessRate UDI (%) 99.0
98.50 Call Setup SuccessRate PS(%) 99.2
1.00 Call Drop Rate AMR(%) 1.0
2.00 Call Drop Rate UDI (%) 1.0
1.00 Call Drop Rate PS(%) 1.0
N/A RRCSetup SuccessRate (%) 99.0
55.00 64KUplink TP, stationary (kbps) N/A
53.00 64KUplink TP, during drivetest (kbps) N/A
57.00 64KDownlink TP, stationary (kbps) N/A
55.00 64KDownlink TP, during drivetest (kbps) N/A
118.00 128KDownlink TP, stationary (kbps) N/A
115.00 128KDownlink TP, during drivetest (kbps) N/A
355.00 384KDownlink TP, stationary (kbps) N/A
330.00 384KDownlink TP, during drivetest (kbps) N/A
250 Roundtrip Delay (ms) N/A
1/50 ISHO AMR 3G->2G (drops/tries) N/A
N/A Cell Availability (%) 99.5
Minimum project target values
(network wide stats)
KPIAchievable in golden
clusters (drive testing)
Achievable Today in Well Optimized Networks
• KPIs are based on field and counter measurements in Customer Networks
• KPIs are based on field and counter measurements in customer
networks
• Values will be updated on quarterly basis
New CSSR
formulas
Projects reporting values
below these are
performing under par level
compared to peer
networks.
Use only static
throughput values
if nothing else not
specifically
required by
customer.
Depending on
GSM network
Quality
Values are
reached when
RRC “pollution” is
properly addressed
if present.
Cell_PCH not
used.
• Note !!: These values are only indicative and for discussion purposes, the values could be better or worse depending
on the case
• UE, Coverage, Interference (indoor/outdoor), Exclusions, Used formulas