Drive Survey Analysis Process Diagram
Drive test Data
Scran Drive test
data
Data loaded into
software tool
RNC Counters
RNC Parameters
KPI report failure
analysis
Weekly report
KPI reports per
route
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
Core Network
KPI
RAN KPI
BS
GPRS
Backbone
PS data
server
3G SGSN
FMT
RNC
Modem
3G MSC
PSTN
Field Measurement
KPI
Firewall
GGSN
End-to-End
KPI
CS data
server
Internet
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).
•
Field
Measurement
KPI
Coverage
KPI Class
Indicates
Coverage (per CPICH RSCP >= xx dBm with yy % probability
CPICH Ec/No >= xx dB with yy % probability
area type)
Formula
100*(nbr_of_samples_rscp_>=_xxdBm)/(tot_nbr_of_samples)
100*(nbr_of_samples_ecno_>=_xxdB)/(tot_nbr_of_samples)
Accessibility
KPI Class
Accessibility
Indicates
Call Setup Success Ratio, Voice [%]
Formula
100*(nbr_of_successful_call_setup_att_voice)/(nbr_of_call_setup_att_voice)
100*(nbr_of_successful_call_setup_att_rt_service)/(nbr_of_call_setup_att_rt_serv
Service Setup Success Ratio, RT Service Other Than Voice [%] ice)
100*(nbr_of_successful_call_setup_att_nrt_service)/(nbr_of_call_setup_att_nrt_s
Service Setup Success Ratio, NRT Service [%]
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)
Retainability
KPI Class
Retainability
Indicates
Call Complete Ratio, Voice [%]
Service Complete Ratio, RT Service Other Than Voice [%]
Service Complete Ratio, NRT Service [%]
Formula
100*(nbr_of_normal_rel_call_voice)/(nbr_of_successful_call_setup_att_voice)
100*(nbr_of_normal_rel_call_rt_service)/(nbr_of_successful_call_setup_att_rt_se
rvice)
100*(nbr_of_normal_rel_call_nrt_service)/(nbr_of_successful_call_setup_att_nrt_
service)
Service Quality & Mobility
KPI Class
Indicates
Service Quality Effective Bandwidth, NRT Service [kbit/s]
Average Throughput, NRT Service [kbit/s]
Average Round Trip Delay, NRT Service [msec]
Soft Handover Success Ratio [%]
Mobility
Formula
Average(allocated_bw_over_data_session_period)
Average(downloaded_data_kbit/data_session_period)
Average(rtd_32bytes)
100*(nbr_of_asu_comp)/(nbr_of_asu)
Achievable Today in Well Optimized Networks
•
KPIs are based on field and counter measurements in Customer Networks
Achievable in golden
clusters (drive testing)
Use only static
throughput values
if nothing else not
specifically
required by
customer.
Depending on
GSM network
Quality
98.50
98.00
98.50
1.00
2.00
1.00
N/A
55.00
53.00
57.00
55.00
118.00
115.00
355.00
330.00
250
1/50
N/A
KPI
Minimum project target values
(network wide stats)
Call Setup Success Rate AMR (%)
Call Setup Success Rate UDI (%)
Call Setup Success Rate PS(%)
Call Drop Rate AMR (%)
Call Drop Rate UDI (%)
Call Drop Rate PS(%)
RRCSetup Success Rate (%)
64K Uplink TP, stationary (kbps)
64K Uplink TP, during drivetest (kbps)
64K Dow nlink TP, stationary (kbps)
64K Dow nlink TP, during drivetest (kbps)
128K Dow nlink TP, stationary (kbps)
128K Dow nlink TP, during drivetest (kbps)
384K Dow nlink TP, stationary (kbps)
384K Dow nlink TP, during drivetest (kbps)
Roundtrip Delay (ms)
ISHO AMR 3G->2G (drops/tries)
Cell Availability (%)
99.0
99.0
99.2
1.0
1.0
1.0
99.0
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
99.5
Projects reporting values
below these are
performing under par level
compared to peer
networks.
New CSSR
formulas
Cell_PCH not
used.
Values are
reached when
RRC “pollution” is
properly addressed
if present.
• KPIs are based on field and counter measurements in customer
networks
• Values will be updated on quarterly basis
• 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