EricssonLTEKPI Library feature parameter description.pdf

Ericsson LTE KPI Library (1).pdf

1. Ericsson LTE KPI Library
HASHEM MAJIDComprehensive Guide to LTE Performance Metrics
network_cell
ERICSSON August 2025

2. Ericsson 4G KPI→Parameter Integration Framework
Holistic Approach
Connects network performance indicators with configuration parameters
and optimization actions
Performance Optimization
Enables data-driven decisions to improve network KPIs through targeted
parameter adjustments
Practical Implementation
Provides concrete case studies and actionable insights for real-world
scenarios
Risk Management
Identifies trade-offs and guardrails to prevent unintended consequences
during optimization
Ericsson LTE KPI Library August 2025
  

KPIs

Parameters

Actions

Impacts

3. KPI Catalog by Category
Accessibility
RRC Connection Setup SR UE gets RRC_CONNECTED
pmRrcConnEstabAtt, pmRrcConnEstabSucc
E-RAB Setup SR Bearer established after RRC
pmErabEstabAtt, pmErabEstabSucc
VoLTE Call Setup SR Voice call establishment
pmErabEstabAttQci1, pmErabEstabSuccQci1
Retainability
E-RAB Abnormal Release Rate Drops after setup
pmErabRelAbnormal, pmErabRelAbnormalQci1
Minutes per Abnormal Release Chronic stability
metric pmErabRelAbnormal, session duration
VoLTE Call Abnormal Release Voice call drops
pmErabRelAbnormalQci1, call duration
Integrity
DL/UL User Throughput Avg & Peak data rates
pmPdcpVolDlDrb, pmPdcpVolUlDrb
Throughput per PRB Spectral efficiency
PDCP volume / PRB usage
Latency & Packet Loss RTT, DL/UL, jitter
RLC delay, retransmission
Mobility
HO Success Rate – Intra-LTE Handover reliability
pmHoPrepAttLte, pmHoPrepSuccLte
HO Success Rate – Inter-LTE Inter-frequency HO
pmHoPrepAttInterFreq, pmHoPrepSuccInterFreq
HO Interruption Time Service continuity
pmHoInterruptionTime, VoLTE gap
Capacity
DL/UL PRB Utilization Resource usage
pmPrbUsedDl/Ul, peak/avg
Active UEs Connected users pmActiveUeDl/Ul
PDCCH Utilization Control channel load
pmPdcchCceUtil
Coverage
RSRP/RSRQ/SINR Signal quality metrics
MDT, drive test, CQI/MCS
VoLTE Frame Erasure Rate Coverage/interference
proxy FER, RTP loss
Cell Availability Network uptime
availability minutes, outages
Ericsson LTE KPI Library August 2025

4. KPI ⇄ Parameter Association (Ericsson LTE MOs)
EUtranCellFDD / EUtranCellTDD (per cell)
Coverage/Power
referenceSignalPower → RSRP
pMax→ Max eNB power
electricalTilt → Coverage pattern
UL Power Control
p0NominalPusch → UL coverage
alpha→ UL power control
srsEnable→ SRS signaling
Mobility (Intra-freq)
a3Offset→ HO trigger
timeToTriggerA3 → HO stability
hysteresis→ Ping-pong
Capacity/Scheduler
maxMimoLayers → Throughput
txMode→ MIMO mode
schedulerType → Resource allocation
CA/eICIC
caEnable→ Carrier aggregation
caCombList→ CA combinations
absPattern→ eICIC pattern
QoS/Admission
qciProfileTable → QoS mapping
admissionControlEnabled → Admission control
gbrAdmissionLimit → GBR limits
EUtranRelation / Geran/Utran Relations
Neighbor Relations
cellIndividualOffset → HO bias
qOffsetFreq→ Freq offset
blacklistedCells → HO restrictions
RACH/Accessibility
preambleInitialReceivedTargetPower
→ RACH
power
powerRampingStep → Power ramping
backoffIndicator → Collision handling
PCI/Neighboring
physicalCellId → Cell identity
PCI collision/confusion → Interference
neighborRelation → HO performance
Ericsson LTE KPI Library August 2025

5. Correlation Map: How Parameter Tweaks Move KPIs
Ericsson LTE KPI Library August 2025
Coverage → Integrity & Retainability
↑ referenceSignalPower
+RSRP (~+1 dB)
Better CQI at edge
↑ DL/UL throughput
↓ VoLTE FER
↓ E-RAB drops
Trade-off
Pilot pollution ⇒ ↓ RSRQ, ↑ inter-cell interference ⇒ may harm neighbor throughput
Capacity/Scheduler → Integrity & Accessibility
↑ maxMimoLayers / better TX mode
↑ throughput per PRB
↓ PRB utilization at same load
Requirements
UE support + good SINR needed for MIMO benefits
eICIC/ABS on macro with pico overlay
↑ small-cell edge throughput (20-40%)
↑ VoLTE integrity
Trade-off
Macro capacity loss during ABS periods
Mobility → Retainability/Integrity
↑ timeToTriggerA3 or a3Offset
↓ ping-pong
↑ HO SR
Risk
Too high ⇒ late HOs ⇒ drops / RLF
Proper A5Threshold1/2 & CIO per carrier
Balanced inter-freq load
↑ throughput
Risk
Wrong bias ⇒ accessibility issues on congested layer
Power Control & RACH → Accessibility/Integrity
Tune p0NominalPusch & alpha
Better UL BLER
↑ VoLTE quality
↑ E-RAB SR
Risk
Too aggressive ⇒ UL interference
RACH parameters
preambleInitialReceivedTargetPower
powerRampingStep
RRC setup SR
Consideration
High collisions (busy cell) ⇒ increase backoff or split PRACH resources

6. Case Study: Tunnel Coverage (L700 macro ingress + DAS)
Ericsson LTE KPI Library August 2025
Symptoms
RSRP < −115 dBm inside tunnel
VoLTE FER > 2%
HO failures entering/exiting tunnel
Prioritized KPIs
Coverage (RSRP/RSRQ histograms)
VoLTE FER
HO SR intra-LTE
Retainability (E-RAB drop QCI1)
Playbook
Audit
•Drive/MDT: RSRP/RSRQ, CQI, HO
events at portals
•Check neighbor list around portals; verify PCI
uniqueness on DAS
Parameters
•DAS cells: set
referenceSignalPower
for −100…−105 dBm
mid-tunnel
•Increase
down-tilt
of portal
macros to
reduce
overshoot
•Enable
srsEnable, tune
UL
p0NominalPusch
(−82 dBm) and
alpha (0.8)
•Mobility:
a3Offset=2–3 dB,
timeToTriggerA3=320
ms, CIO +2 dB
Checks
HO SR intra-LTE ≥ 98%
VoLTE FER < 1%
RSRP ≥ −105 dBm (95% of tunnel)
Drops < 0.2%
Trade-offs
!If DAS RS power too high → bleed outside
!Monitor neighbor RSRQ/ABS if pico overlay exists

7. Case Study: Stadium Capacity (50,000 attendees)
Ericsson LTE KPI Library August 2025
Symptoms
DL PRB > 90%
PDCCH/CQI collapse
VoLTE jitter, poor voice quality
Low user throughput
Prioritized KPIs
DL/UL PRB utilization
DL/UL throughput per user
Active UE count
PDCCH/CCE utilization
HO SR (offload to small cells)
Playbook
Layering
&
Features
•Multi-band CA
(B3+B1+B7):
caEnable=ON
•MIMO:
maxMimoLayers=4
where SINR allows
•Small-cell
overlay with
eICIC/ABS
Power/PCI
•Reduce macro
referenceSignalPower by 1-2
dB
•Increase pico RS power
by 1 dB for seating
RACH/Access
Control
•Increase PRACH
resources, adjust
backoffIndicator
•Admission control: cap
non-GBR if VoLTE
congestion
KPI Targets
DL PRB ≤ 85% avg
User DL throughput ≥ 5-10 Mbps median
VoLTE jitter < 30 ms
ERAB drop < 0.5%
HO SR ≥ 98%
Operational Tactics
Event features
profile
•Scheduled timer to apply patterns during match
time
After-action
•Revert ABS and RS power to normal after event

8. Case Study: Basement/Room Poor 4G Internet
Ericsson LTE KPI Library August 2025
Symptoms
Speed < 2 Mbps
VoLTE choppy
RSRP −115 dBm
RSRQ −17 dB
Prioritized KPIs
RSRP/RSRQ/SINR
RRC/E-RAB SR
VoLTE FER/jitter
UL BLER
Playbook
Quick
triage
•Field/MDT: RSRP/RSRQ/CQI
and serving cell/PCI
•Check layer: is UE on low-
band (B20/B28)?
Parameter
actions
•Coverage
biasing:
increase
reselection/HO
bias toward
building
•RS
power
lift (+1
dB) on
best
indoor
layer
•UL reach:
p0NominalPusch
toward −82 dBm,
alpha=0.8
•VoLTE
robustness:
enable TTI
bundling
for deep
indoor
Alternatives
If macro cannot meet −105 dBm:
LTE small cell
Indoor repeater/DAS
VoWiFi (policy route in EPC/IMS)
Success Gates
RSRP ≥ −105 dBm (target)
RSRQ ≥ −12 dB
VoLTE FER < 1.5%
User DL ≥ 5 Mbps

9. KPI Overview
priority_highImportance of KPIs
categorySix KPI Areas
Accessibility
Measures ability to establish connections
Retainability
Measures ability to maintain connections
Integrity
Measures quality of data transfer
Mobility
Measures handover performance
Availability
Measures network uptime
Utilization
Measures resource efficiency
assessmentCommercial Impact
Ericsson LTE KPI Library August 2025
KPI thresholds directly impactfinancial riskand network performance•
High KPI targets can bealmost impossible to achieve, requiring significant optimization•
Measurement scope affectstime, resources, and costof acceptance procedures•
Number of samples needed directly affectsmeasurement time and cost•
Well-defined acceptance criteria minimizeoptimization effort•
Alternative KPIs require carefulrisk analysisand justification•

10. SSSR (Session Setup Success Rate)
category
Accessibilitypriority_high
High Impact
description
Definition
Probability of successfully initiating a data session from an end-user perspective. Includes all steps from random access process until RRC
Connection Complete message is sent by UE to inform RBS that bearer has been successfully established.
functions
Formulas
Drive Test
SSSR[%] = 100 × (#Successful Session Setups /
#Session Attempts)
OSS Formula
SSSR[%] = 100 × (#RRC_Success / (#RRC_Attempts
- #RRC_Reattempts)) × (#S1_Success /
#S1_Attempts) × (#ERAB_Success /
#ERAB_Attempts)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
Ericsson LTE KPI Library Accessibility • KPI #1Accessibility
High impacton user experience•
Affects ability to initiate data sessions•
Testing withfixed-duration short sessions(e.g., 2 minutes)•
Best measured in controlled environments or Golden Clusters•
Can replace RRC and E-RAB Accessibility KPIs•
Impacted by RAN, EPC, transmission capacity•
Use alternative formula to exclude mobile origination
signaling
•

11. TSSR (Terminating Session Success Rate)
category
Accessibilitypriority_high
Low Impact
description
Definition
Probability of the network successfully initiating a session to the UE. Analogous to "Paging Success Rate". Defined as number of
successful terminating session setup attempts divided by total number of terminating session attempts.
functions
Formulas
Drive Test / L3 Paging Messages
TSSR[%] = 100 × (#Pages Responded To / (#Pages
Transmitted + #Pages Discarded))
OSS-Based (Statistical Counters)
TSSR[%] = 100 × (#Pages Responded To / (#Pages
Transmitted + #Pages Discarded))
settings
Execution / User Impact
assignment
Contractual Information
cancel
Not Recommended
Ericsson LTE KPI Library Accessibility • KPI #2Accessibility
Best measured incontrolled environmentor Golden Cluster•
Common method: FTP
download/upload with
fixed
duration
(1-2
minutes)
•
Start Trigger: Call Attempt or first RRC Connection Request•
Stop Trigger: RAB Setup Complete message•
UE logging or eNodeB traces can capture L3 paging messages•
If customer
focuses on
data
terminals
(generate sessions rather than
terminate)
•
Impacted by radio and core nodes, transmission capacity•
Can be used as proxy for Voice Telephony TSSR KPIs•

12. CSSR_VOLTE (VoLTE- Call Setup Success Rate)
category
Accessibilitypriority_high
High Impact
description
Definition
Success rate of setting up VoLTE calls. Measures the network's ability to establish voice calls over LTE infrastructure.
functions
Formula
Standard Formula
CSSR_VOLTE[%] = 100 × (#Successful VoLTE
Calls / #Attempted VoLTE Calls)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Accessibility • KPI #30Accessibility
High failure ratereduces VoLTE adoption•
Must consider bothradio and corenetwork factors•
Measured using Drive Test, PM Statistics, IP Probes•
Applicable areas: Controlled Environment, Golden Cluster, In-
Service
•
Key indicator forVoLTE service quality•
Directly impacts customer experience•
Can be used as benchmark for voice service performance•
Requires coordination between RAN and core network•
Success depends on IMS and EPC integration•
Measurement requires specialized test equipment•
High thresholds may require significant optimization•
call

13. CSSR_CSFB (CS Voice- Call Setup Success Rate - CSFB 3G)
category
Accessibilitypriority_high
High Impact
description
Definition
Success rate of setting up CS voice calls via Circuit Switched Fallback (CSFB) to 3G network. Measures the network's ability to establish
traditional voice calls when LTE is used for data but voice is handled by 3G.
functions
Formula
Standard Formula
CSSR_CSFB[%] = 100 × (#Successful CSFB
Calls / #Attempted CSFB Calls)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Accessibility • KPI #39Accessibility
Failure means no voice servicein LTE areas with 3G fallback•
Requiresgood 3G coverageand proper inter-RAT coordination•
Measured using Drive Test, PM Statistics•
Critical for areas where VoLTE is not deployed•
Essential forvoice service continuity•
Directly impacts customer experience in mixed networks•
Key metric during LTE rollout phase•
Requires proper LTE to 3G handover configuration•
Success depends on LTE and 3G network integration•
Measurement requires dual-mode test equipment•
Affected by 3G network capacity and congestion•
phone_in_talk

14. CSSR_CSFB (CS Voice- Call Setup Success Rate- CSFB 2G)
category
Accessibilitypriority_high
High Impact
description
Definition
Success rate of setting up CS voice calls via Circuit Switched Fallback (CSFB) to 2G network. Measures the network's ability to establish
traditional voice calls when LTE is used for data but voice is handled by 2G.
functions
Formula
Standard Formula
CSSR_CSFB[%] = 100 × (#Successful CSFB
Calls / #Attempted CSFB Calls)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Accessibility • KPI #40Accessibility
More sensitive to coverage issuesthan 3G CSFB•
Requiresrobust 2G networkand proper inter-RAT coordination•
Measured using Drive Test, PM Statistics•
Critical for rural/remote areas with limited 3G coverage•
Essential foruniversal voice servicecoverage•
Directly impacts customer experience in edge coverage
areas
•
Key metric for networks with limited 3G footprint•
Requires proper LTE to 2G handover configuration•
Success depends on LTE and 2G network integration•
Measurement requires dual-mode test equipment•
Affected by 2G network capacity and congestion•
signal_cellular_alt

15. SARR (Session Abnormal Release Rate)
category
Retainabilitypriority_high
High Impact
description
Definition
Measures the ability of the network to maintain a radio access bearer independent of the user session on the bearer. Defined as the ratio
of abnormal session disconnections divided by the total number of session releases.
functions
Formulas
OSS-Based
SARR[%] = 100 × (pmErabRelAbnormalEnbAct +
pmErabRelMmeActEutra) / (pmErabRelAbnormalEnb
+ pmErabRelNormalEnb + pmErabRelMme)
Flexible Counters (Compensated)
Compensated E-RAB Retainability[%] = 100 ×
((pmErabRelAbnormalEnbAct -
pmFlexErabRelAbnormalEnbActFilter) +
(pmErabRelAbnormalMmeAct -
pmFlexErabRelAbnormalMmeActFilter)) /
((pmErabRelAbnormalEnb -
pmFlexErabRelAbnormalEnbFilter) +
(pmErabRelNormalEnb -
pmFlexErabRelNormalEnbFilter) + (pmErabRelMme
- pmFlexErabRelMmeFilter))
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
Ericsson LTE KPI Library Retainability • KPI #3Retainability
Used for acceptance withshort data sessions(1-3 minutes)•
Not reliable forlong-term measurements(use MPAR instead)•
Affected by user behavior (smartphone apps)•
OSS counters may vary due to external factors•
Should only be used forshort sessions•
Excludes failures due to poor RF conditions•
Can be used as proxy for VoLTE call retainability•
network_check

16. MPAR (Minutes Per Abnormal Release)
category
Retainabilitypriority_high
High Impact
description
Definition
Average time between abnormal session releases. Reflects how often a session is abnormally terminated, providing insight into network
stability and connection reliability.
functions
Formula
Drive Test / Statistics
MPAR = Total Minutes of Active Sessions /
Number of Abnormal Releases
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Retainability • KPI #4Retainability
Independent of throughput, focuses on session stability•
ERAB failures only impact MPAR if they causesession failure•
Excludes session errors caused by FTP problems or user abort•
Best suited for fixed-duration sessions (e.g., 2 minutes)•
Use alternative formula to
exclude
RRC drops that
reestablish
•
KPI reduction: Can replace RRC and E-RAB Accessibility KPIs•
Impacted by RAN, EPC, transmission capacity•
Higher values indicate better network stability•
Requires careful definition of "abnormal release"•
Measurement period affects statistical significance•
May need to exclude planned maintenance activities•
timer

17. CARR_VOLTE (VoLTE - Call Abnormal Release Rate)
category
Retainabilitypriority_high
High Impact
description
Definition
Rate at which VoLTE calls are abnormally terminated. Measures the network's ability to maintain ongoing VoLTE calls without unexpected
disconnections.
functions
Formula
Standard Formula
CARR_VOLTE[%] = 100 × (#Abnormal VoLTE
Releases / #Total VoLTE Releases)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Retainability • KPI #31Retainability
Frequent dropsaffect call quality and user trust•
Should beminimizedthrough optimization•
Measured using Drive Test, PM Statistics, IP Probes•
Applicable areas: Controlled Environment, Golden Cluster, In-
Service
•
Key indicator forVoLTE service quality•
Directly impacts customer satisfaction•
Requires coordination between RAN and IMS•
Lower values indicate better network performance•
Success depends on proper handover configuration•
Measurement requires specialized test equipment•
May be affected by core network congestion•
call_end

18. CCSR_VOLTE (VoLTE-Call Completion Success Rate)
category
Retainabilitypriority_high
High Impact
description
Definition
Success rate of completing VoLTE calls from initiation to answer. Measures the network's ability to successfully establish and maintain
VoLTE calls through the entire call setup process.
functions
Formula
Standard Formula
CCSR_VOLTE[%] = 100 × (#Completed Calls /
#Initiated Calls)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Retainability • KPI #32Retainability
Low completion rateindicates poor call quality•
Reflectsend-to-end call quality•
Measured using Drive Test, PM Statistics, IP Probes•
Applicable areas: Controlled Environment, Golden Cluster, In-
Service
•
Key indicator forVoLTE service reliability•
Directly impacts customer satisfaction•
Requires coordination between RAN and IMS•
Higher values indicate better network performance•
Success depends on proper signaling configuration•
Measurement requires specialized test equipment•
May be affected by core network congestion•
phone_in_talk

19. ULUT (Uplink User Throughput)
category
Integritypriority_high
High Impact
description
Definition
Average uplink throughput experienced by users on a radio bearer. Includes user data but excludes retransmissions, padding bits, PDU
headers, and RLC control PDUs.
functions
Formulas
Drive Test
UL User Throughput[kbps] = 8 × File Size
(kBytes) / File Transfer Time (sec)
OSS-Based (Counters)
UL UE Throughput[kbps] = pmUeTphVolUl /
(pmUeTphTimeUl / 1000)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
Ericsson LTE KPI Library Integrity • KPI #5Integrity
Measured
via
UE test
equipment
for direct correlation with radio
conditions
•
Stationary testsrecommended for high target throughput•
For drive tests, sampled every second and geo-binned•
Not reliable using counters due to small packets (especially
VoLTE)
•
Affected
by
licensed UL
capacity
, radio environment, RBS
nodes
•
Large variations between drive test and statistics•
Use PUSCH for measurement•
Key indicator for user experience with uploads•
upload

20. DLUT (Downlink User Throughput)
category
Integritypriority_high
High Impact
description
Definition
Average downlink throughput experienced by users on a radio bearer. Includes user data but excludes retransmissions, padding bits, PDU
headers, and RLC control PDUs.
functions
Formulas
Drive Test
DL User Throughput[kbps] = 8 × File Size
(kBytes) / File Transfer Time (sec)
OSS-Based (Counters)
DL User Throughput[kbps] = median
PDSCH_Volume_kbits_i / Measurement_time_i
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
Ericsson LTE KPI Library Integrity • KPI #6Integrity
Measured viaUE test equipment•
Stationary testsbest for high targets•
Drive tests sample every second and geo-bin results•
Use PDSCH for measurement•
Impacted
by
licensed DL
capacity
, radio environment, RBS
nodes
•
Large variations between drive test and statistics•
Features like DL CA, DL COMP, and 256 QAM improve
performance
•
Key indicator for user experience with downloads•
download

21. DLUT_PerPRB (Downlink User Throughput per PRB)
category
Integritypriority_high
High Impact
description
Definition
Throughput achieved per Physical Resource Block (PRB) in the downlink. Measures spectral efficiency and resource utilization
effectiveness.
functions
Formula
Normalized Version of DLUT
DLUT_PerPRB = DLUT / Number of Used PRBs
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #7Integrity
Useful for capacity planningand optimization•
Requires detailedPRB usage statistics•
Valid for both drive test and OSS measurements•
Helps identify inefficient resource allocation•
Helps identifyresource utilization bottlenecks•
Can be used to assess network efficiency•
Enables comparison between different network
configurations
•
Key indicator for spectral efficiency optimization•
Values vary based on modulation schemes and coding rates•
Higher values indicate better spectral efficiency•
May be affected by interference and channel conditions•
signal_cellular_alt

22. ULPUT (Uplink Peak User Throughput)
category
Integritypriority_high
Medium Impact
description
Definition
Maximum achievable uplink throughput under ideal conditions. Represents the highest possible data rate that can be achieved in the
uplink direction.
functions
Formula
Measurement Method
Measured via stationary tests with large
file uploads (e.g., 500 MB)
Testing Tools
Use UDP or TCP push applications like
iperf
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #7Integrity
Requireshigh-quality test equipment•
Needsoptimal RF conditionsfor accurate measurement•
Best for benchmarking peak performance•
Typically measured in controlled environments•
Often tested in controlled environments•
Key indicator for network capability assessment•
Used for marketing and performance claims•
Requires careful test setup and calibration•
Results depend on UE capabilities•
Affected by network configuration and features•
May vary based on carrier aggregation support•
speed

23. DLPUT (Downlink Peak User Throughput)
category
Integritypriority_high
Medium Impact
description
Definition
Maximum achievable downlink throughput under ideal conditions. Represents the highest possible data rate that can be achieved in the
downlink direction.
functions
Formula
Measurement Method
Measured via stationary tests with large
file downloads (e.g., 500 MB)
Testing Tools
Use UDP or TCP applications like iperf
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #8Integrity
Critical for evaluating network peak performance•
Requiresoptimal RF conditionsand scheduling•
Best for benchmarking maximum capabilities•
Typically measured in controlled environments•
Commonly used in acceptance testing•
Key indicator for network capability assessment•
Used for marketing and performance claims•
Requires careful test setup and calibration•
Results depend on UE capabilities•
Affected by network configuration and features•
May vary based on carrier aggregation support•
speed

24. LAT_RTT (Latency Round Trip Time)
category
Integritypriority_high
Medium Impact
description
Definition
Time taken for a packet to travel from source to destination and back. Measures the total delay experienced in both directions of
communication.
functions
Formula
Generic
LAT_RTT = Time to send + Time to receive
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #9Integrity
Affectsreal-time applicationslike gaming and VoIP•
Must consider bothradio and core delays•
Measured using Drive Test in controlled environments•
Applicable areas: Controlled Environment, Golden Cluster,
Cluster, Network
•
Requiresprecise timing measurements•
Key indicator for interactive application performance•
Lower values indicate better network responsiveness•
Critical for customer experience with real-time services•
Values vary based on network load and distance•
Affected by processing delays at network elements•
May be impacted by transmission medium•
timer

25. LAT_DL (Latency - Downlink)
category
Integritypriority_high
Low Impact
description
Definition
Delay in receiving data from the network. Measures the time taken for packets to travel from network source to the user equipment.
functions
Formula
Standard
LAT_DL = Time from transmission to
reception
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #11Integrity
Affectsdownload responsiveness•
Influenced byqueueing, scheduling, and propagation•
Measured using PM Statistics•
Applicable areas: In-Service•
Less critical than overall RTT for most applications•
Useful fordownlink-specific analysis•
May be impacted by network congestion•
Lower values indicate better network performance•
Values vary based on network load•
Affected by processing delays at network elements•
May be impacted by transmission medium•
arrow_downward

26. LAT_CP_IA (Latency Control Plane Idle to Active)
category
Integritypriority_high
Low Impact
description
Definition
Time to transition from idle to active state in the control plane. Measures the delay experienced when a device moves from standby mode
to active communication mode.
functions
Formula
Standard
LAT_CP_IA = Time from RRC Connection
Request to RRC Connection Setup Complete
settings
Execution / User Impact
assignment
Contractual Information
cancel
Not Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #13Integrity
Affects how quickly a device
can
start transmitting
data
after being
idle
•
Important forlow-latency applications•
Measured using Drive Test, Network Traces•
Applicable areas: Controlled Environment, Golden Cluster•
Less critical for most user applications•
Primarily relevant forspecific use cases•
Requires specialized measurement tools•
May be impacted by network congestion•
Values vary based on network load•
Affected by RAN configuration and signaling capacity•
May be impacted by UE capabilities•
swap_vertical_circle

27. LAT_AT (Latency - Attach Time)
category
Integritypriority_high
Low Impact
description
Definition
Time required for a UE to attach to the network. Measures the delay experienced when a device first connects to the LTE network after
power-on or returning from out-of-coverage area.
functions
Formula
Standard
LAT_AT = Time from Attach Request to
Attach Accept
settings
Execution / User Impact
assignment
Contractual Information
cancel
Not Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #15Integrity
Long attach timesdelay service access•
Affected byauthentication and signaling overhead•
Measured using Drive Test, Network Traces, IP Protocol Probes•
Applicable areas: Controlled Environment, Golden Cluster•
Less critical for ongoing user experience•
Primarily affectsinitial network access•
Requires specialized measurement tools•
May be impacted by core network congestion•
Values vary based on network load•
Affected by MME and HSS processing capacity•
May be impacted by security procedures•
link

28. PLR_UL (Packet Loss Rate - Uplink)
category
Integritypriority_high
Medium Impact
description
Definition
Percentage of uplink packets lost during transmission. Measures the reliability of data transmission in the uplink direction from user
equipment to the network.
functions
Formula
Standard
PLR_UL % = 100 × #PdcpPacketsLostUL /
(#PdcpPacketsLostUL +
#PdcpPacketsReceivedUL)
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #16Integrity
High loss leads to retransmissionsand reduced throughput•
Critical for VoIPand video conferencing•
Measured using PM Statistics•
Applicable areas: Controlled Environment, Golden Cluster,
Cluster, Network, In-Service
•
Less critical than overall integrity metrics•
Useful foruplink-specific analysis•
May be impacted by uplink interference•
Lower values indicate better network performance•
Values vary based on radio conditions•
Affected by UE power and antenna configuration•
May be impacted by uplink congestion•
arrow_upward

29. PLR_DL (Packet Loss Rate - Downlink)
category
Integritypriority_high
Medium Impact
description
Definition
Percentage of downlink packets lost during transmission. Measures the reliability of data transmission in the downlink direction from
network to user equipment.
functions
Formula
Standard
PLR_DL % = 100 × #PdcpPacketsLostDL /
(#PdcpPacketsLostDL +
#PdcpPacketsReceivedDL)
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #17Integrity
Affectsstreaming qualityand file downloads•
Must account forRF conditions and network congestion•
Measured using PM Statistics•
Applicable areas: Controlled Environment, Golden Cluster,
Cluster, Network, In-Service
•
Less critical than overall integrity metrics•
Useful fordownlink-specific analysis•
May be impacted by downlink interference•
Lower values indicate better network performance•
Values vary based on radio conditions•
Affected by cell load and scheduling policies•
May be impacted by downlink congestion•
arrow_downward

30. PLR_RT (Packet Loss Rate - Round Trip)
category
Integritypriority_high
Medium Impact
description
Definition
Combined packet loss rate for round-trip communication. Measures the overall reliability of data transmission in both directions between
user equipment and network.
functions
Formula
Standard
PLR_RT = (PLR_UL + PLR_DL) / 2
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #18Integrity
Comprehensive measureof end-to-end reliability•
Providesoverall viewof packet loss in both directions•
Measured using Drive Test•
Applicable areas: Controlled Environment, Golden Cluster•
Not commonly usedin standard KPI sets•
Less critical than directional packet loss metrics•
May be useful for specific use cases•
Lower values indicate better network performance•
Values vary based on overall network conditions•
Affected by both uplink and downlink factors•
May mask issues in one direction if the other is good•
swap_horiz

31. PKT_JITT (Packet Jitter)
category
Integritypriority_high
Medium Impact
description
Definition
Variation in packet inter-arrival times. Measures the inconsistency in the timing of packet delivery, which can impact the quality of real-
time applications.
functions
Formula
Standard
PKT_JITT = Standard Deviation of Inter-
Arrival Times
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #19Integrity
High jitter degradesVoIP and video quality•
Essential for real-time services•
Measured using Drive Test, IP Protocol Probes•
Applicable areas: Controlled Environment, Golden Cluster•
Less critical than basic integrity metrics•
Useful forreal-time application analysis•
May be impacted by network congestion•
Lower values indicate better network performance•
Values vary based on network load and congestion•
Affected by scheduling algorithms and buffer management•
May be impacted by interference and radio conditions•
waves

32. CST_VOLTE (VoLTE - Call Setup Time)
category
Integritypriority_high
Medium Impact
description
Definition
Time taken to establish a VoLTE call. Measures the delay experienced from call initiation to when the call is successfully connected.
functions
Formula
Standard
CST_VOLTE = Time from Call Initiation to
Answer
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #33Integrity
Longer times reduce user satisfaction•
Must meetstrict latency requirements•
Measured using Drive Test, IP Probes•
Applicable areas: Controlled Environment, Golden Cluster•
Important forVoLTE service quality•
Directly impacts customer experience•
Requires coordination between RAN and IMS•
Lower values indicate better network performance•
Values vary based on network load•
Affected by signaling capacity and processing delays•
May be impacted by core network congestion•
call

33. JITT_VOLTE (VoLTE - Jitter)
category
Integritypriority_high
High Impact
description
Definition
Variation in packet arrival times for VoLTE calls. Measures the inconsistency in the timing of voice packet delivery, which directly impacts
call quality.
functions
Formula
Standard
JITT_VOLTE = Standard Deviation of Inter-
Arrival Times
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #35Integrity
High jitter causes audio distortion•
Critical for VoIP quality•
Measured using specialized test equipment•
Applicable areas: Controlled Environment, Golden Cluster•
Key indicator forvoice quality•
Directly impacts customer satisfaction•
Requires proper buffer management•
Lower values indicate better call quality•
Values vary based on network load•
Affected by scheduling algorithms•
May be impacted by interference and radio conditions•
graphic_eq

34. SPD_VV, SPD_VBO (VoLTE - Speech Path Delay)
category
Integritypriority_high
High Impact
description
Definition
Delay in the speech path during VoLTE calls. Measures the time it takes for voice packets to travel from sender to receiver, directly
affecting conversation quality.
functions
Formula
Standard
SPD = One-way delay from sender to
receiver
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #36Integrity
Excessive delay causes echoand conversation lag•
Must comply withITU-T standards•
Measured using specialized test equipment•
Applicable areas: Controlled Environment, Golden Cluster•
Key indicator forconversation quality•
Directly impacts customer experience•
Requires optimization of network paths•
Lower values indicate better call quality•
Values vary based on network topology•
Affected by core network routing•
May be impacted by transcoding processes•
record_voice_over

35. SQ_VOLTE (VoLTE - Speech Quality)
category
Integritypriority_high
High Impact
description
Definition
Subjective or objective assessment of VoLTE call quality. Measures the perceived quality of voice transmission over LTE network using
standardized scoring methods.
functions
Formula
Standard
SQ_VOLTE = MOS Score (Mean Opinion Score)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #37Integrity
Poor quality reduces user satisfaction•
Requiresspecialized toolsfor measurement•
MOS scale typically ranges from 1 (poor) to 5 (excellent)•
Applicable areas: Controlled Environment, Golden Cluster•
Key indicator forvoice service quality•
Directly impacts customer experience•
Requires optimization of codec and network parameters•
Higher MOS values indicate better call quality•
Values vary based on network conditions•
Affected by codec selection and network congestion•
May be impacted by background noise and echo•
mic

36. CST_CSFB (CS Voice - Call Setup Time - CSFB)
category
Integritypriority_high
High Impact
description
Definition
Time to set up a CS voice call via Circuit Switched Fallback (CSFB). Measures the delay experienced when a voice call is established by
falling back to 2G/3G networks from LTE.
functions
Formula
Standard
CST_CSFB = Time from Call Initiation to
Answer
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #38Integrity
Longer times affect user experiencecompared to VoLTE•
Depends on2G/3G network response time•
Measured using specialized test equipment•
Applicable areas: Controlled Environment, Golden Cluster•
Key indicator forvoice service quality•
Directly impacts customer experience•
Requires optimization of inter-RAT handover•
Lower values indicate better call setup performance•
Values vary based on network topology•
Affected by legacy network performance•
May be impacted by inter-RAT signaling capacity•
phone_callback

37. SRVCC_IT (SRVCC Interruption Time)
category
Integritypriority_high
High Impact
description
Definition
Duration of interruption during SRVCC handover from LTE to circuit-switched domain. Measures the gap in service continuity when a
voice call is transferred between LTE and legacy networks.
functions
Formula
Standard
SRVCC_IT = Time from Last LTE Packet to
First CS Packet
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #41Integrity
Shorter times ensure smoother transitions•
Requirestight coordinationbetween LTE and CS networks•
Measured using Drive Test, Network Traces•
Applicable areas: Controlled Environment, Golden Cluster•
Key indicator forservice continuity•
Directly impacts customer experience during handover•
Requires optimization of inter-RAT handover•
Lower values indicate better handover performance•
Values vary based on network topology•
Affected by core network integration•
May be impacted by inter-RAT signaling capacity•
swap_horiz

38. SRVCC_SR (SRVCC HO Success Rate)
category
Integritypriority_high
High Impact
description
Definition
Success rate of SRVCC handovers. Measures the reliability of voice call continuity when transitioning between LTE and circuit-switched
networks.
functions
Formula
Standard
SRVCC_SR % = 100 × (#Successful SRVCC
Handovers / #Attempted SRVCC Handovers)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #42Integrity
Failure results in call drop•
Must beoptimized for high reliability•
Measured using Drive Test, Network Traces•
Applicable areas: Controlled Environment, Golden Cluster•
Key indicator forservice continuity•
Directly impacts customer experience during handover•
Requires optimization of inter-RAT handover•
Higher values indicate better handover performance•
Values vary based on network topology•
Affected by core network integration•
May be impacted by inter-RAT signaling capacity•
swap_horiz

39. VOIP_INTEG (VOIP Integrity)
category
Integritypriority_high
Medium Impact
description
Definition
Overall integrity of VoIP sessions. Comprehensive measure that combines multiple factors affecting voice quality over IP networks.
functions
Formula
Composite
VOIP_INTEG = Composite of jitter, packet
loss, delay, and MOS
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #43Integrity
Comprehensive measureof VoIP quality•
Should be validated throughin-depth testing•
Measured using specialized test equipment•
Applicable areas: Controlled Environment, Golden Cluster•
Less critical than individual integrity metrics•
Useful foroverall VoIP assessment•
May be impacted by network congestion•
Higher values indicate better VoIP performance•
Values vary based on network conditions•
Affected by codec selection and network parameters•
May be impacted by background noise and echo•
call

40. VOLTE_FER (VoLTE Frame Erasure Rate)
category
Integritypriority_high
High Impact
description
Definition
Rate at which VoLTE voice frames are erased due to errors. Measures the percentage of voice frames that cannot be decoded correctly at
the receiver.
functions
Formula
Standard
VOLTE_FER % = 100 × (#Erased Frames /
#Total Frames)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Integrity • KPI #44Integrity
High erasure rate degrades voice quality•
Indicator of radio link quality•
Measured using specialized test equipment•
Applicable areas: Controlled Environment, Golden Cluster•
Key indicator forvoice quality•
Directly impacts customer experience•
Requires optimization of radio conditions•
Lower values indicate better call quality•
Values vary based on radio conditions•
Affected by interference and signal strength•
May be impacted by network congestion•
error_outline

41. HOSR_LTE (Handover Success Rate - Intra LTE)
category
Mobilitypriority_high
High Impact
description
Definition
Success rate of handovers within the same LTE frequency band. Measures the network's ability to maintain seamless connectivity as users
move between cells.
functions
Formula
Standard
HOSR_LTE % = 100 × (#Successful Handovers
/ #Attempted Handovers)
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Mobility • KPI #21Mobility
Poor success rate leads to dropped callsand data interruptions•
Depends onRF conditionsand neighbor cell configuration•
Measured using Drive Test, RAN Counters•
Applicable areas: Controlled Environment, Golden Cluster,
Cluster, Network, In-Service
•
Key indicator fornetwork mobility performance•
Directly impacts customer experience during movement•
Requires optimization of handover parameters•
Higher values indicate better mobility performance•
Values vary based on network topology•
Affected by neighbor cell planning and configuration•
May be impacted by interference and signal strength•
swap_horiz

42. HOSR_InterF (Handover Success Rate - Intra LTE-InterF)
category
Mobilitypriority_high
Medium Impact
description
Definition
Success rate of handovers between different LTE frequency bands. Measures the network's ability to maintain seamless connectivity as
users move between cells operating on different frequencies.
functions
Formula
Standard
HOSR_InterF % = 100 × (#Successful
Handovers / #Attempted Handovers)
settings
Execution / User Impact
assignment
Contractual Information
cancel
Not Recommended
warning
Key Considerations
Ericsson LTE KPI Library Mobility • KPI #22Mobility
Affectsmulti-band network performance•
More complexthan intra-frequency handovers•
Measured using Drive Test, RAN Counters•
Applicable areas: Controlled Environment, Golden Cluster, In-
Service
•
Less critical thanintra-frequency handovers•
Requires additional measurement resources•
May be impacted by frequency-specific interference•
Higher values indicate better inter-frequency mobility•
Values vary based on frequency band characteristics•
Affected by inter-frequency measurement gaps•
May be impacted by UE capabilities and band support•
swap_calls

43. HOIT_CP (Handover Interruption Time - Control Plane)
category
Mobilitypriority_high
Medium Impact
description
Definition
Duration of interruption in control plane signaling during handover. Measures the time gap in control communication when a UE
transitions between cells.
functions
Formula
Standard
HOIT_CP = Time from RRC Connection
Reconfiguration to RRC Connection
Reconfiguration Complete
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Mobility • KPI #23Mobility
Shorter times improve service continuity•
Important for mission-critical communications•
Measured using Drive Test•
Applicable areas: Controlled Env. Golden Cluster, Cluster,
Network
•
Less critical thanhandover success rate•
Requires specialized measurement tools•
May be impacted by network load•
Lower values indicate better handover performance•
Values vary based on network topology•
Affected by signaling capacity and processing•
May be impacted by core network congestion•
sync

44. HOIT_UP (Handover Interruption Time - User Plane)
category
Mobilitypriority_high
Medium Impact
description
Definition
Duration of interruption in user data flow during handover. Measures the time gap in data transmission when a UE transitions between
cells.
functions
Formula
Standard
HOIT_UP = Time from Last Received Packet
to First Packet After Handover
settings
Execution / User Impact
assignment
Contractual Information
remove_circle
Optional
warning
Key Considerations
Ericsson LTE KPI Library Mobility • KPI #25Mobility
Directly affects data session continuity•
Requiresprecise timestamping•
Measured using Drive Test•
Applicable areas: Controlled Environment, Golden Cluster•
Less critical thanhandover success rate•
Requires specialized measurement tools•
May be impacted by network load•
Lower values indicate better handover performance•
Values vary based on network topology•
Affected by data forwarding mechanisms•
May be impacted by core network congestion•
swap_vertical_circle

45. HOIT_IRAT_SC (IRAT-Session Continuity Interruption Time)
category
Mobilitypriority_high
Low Impact
description
Definition
Time gap in session continuity during inter-RAT handovers (e.g., LTE to 3G). Measures the interruption period when a session transitions
between different radio access technologies.
functions
Formula
Standard
HOIT_IRAT_SC = Time from Last Packet
Before Handover to First Packet After
Handover
settings
Execution / User Impact
assignment
Contractual Information
cancel
Not Recommended
warning
Key Considerations
Ericsson LTE KPI Library Mobility • KPI #27Mobility
Affectsseamless service transition•
Complex to measure accurately•
Measured using Drive Test, Network Traces•
Applicable areas: Controlled Environment, Golden Cluster•
Less critical thanintra-RAT handovers•
Requires specialized measurement tools•
May be impacted by core network integration•
Lower values indicate better inter-RAT performance•
Values vary based on RAT combination•
Affected by inter-RAT coordination mechanisms•
May be impacted by core network congestion•
compare_arrows

46. HOSR_4G_3G (IRAT-PS Handover Success Rate-LTE to 3G)
category
Mobilitypriority_high
Medium Impact
description
Definition
Success rate of PS handovers from LTE to 3G. Measures the network's ability to maintain packet session continuity when transitioning
between different radio access technologies.
functions
Formula
Standard
HOSR_4G_3G % = 100 × (#Successful
Handovers / #Attempted Handovers)
settings
Execution / User Impact
assignment
Contractual Information
cancel
Not Recommended
warning
Key Considerations
Ericsson LTE KPI Library Mobility • KPI #28Mobility
Ensuressmooth transitionwhen LTE coverage is weak•
Requiresgood 3G coverage•
Measured using Drive Test, PM Statistics•
Applicable areas: Controlled Environment, Golden Cluster, In-
Service
•
Less critical thanintra-LTE handovers•
Requires coordination between LTE and 3G networks•
May be impacted by core network integration•
Higher values indicate better inter-RAT performance•
Values vary based on network topology•
Affected by inter-RAT neighbor configuration•
May be impacted by 3G network capacity•
compare_arrows

47. CA (Cell Availability)
category
Availabilitypriority_high
Low Impact
description
Definition
Percentage of time a cell is available for service. Measures the network's operational reliability and ability to provide continuous service
to users.
functions
Formula
Standard
CA % = 100 × (Total Time - Downtime) /
Total Time
settings
Execution / User Impact
assignment
Contractual Information
check_circle
Recommended
warning
Key Considerations
Ericsson LTE KPI Library Availability • KPI #29Availability
Low availability means service unavailability•
Critical for network uptimeguarantees•
Measured using PM Statistics•
Applicable areas: Cluster, Network, In-Service•
Key indicator fornetwork reliability•
Directly impacts customer experience•
Requires proper maintenance and monitoring•
Higher values indicate better network availability•
Values vary based on maintenance schedules•
Affected by hardware reliability and redundancy•
May be impacted by power supply stability•
signal_cellular_4_bar

48. Key Takeaways
trending_up
KPI Importance
warning
Financial Risk
filter_list
KPI Selection
library_books
KPI Library Value
The Ericsson LTE KPI Library provides essential guidance for effective network performance measurement and optimization
Ericsson LTE KPI Library August 2025
Direct impacton network performance•
Measure success of network optimization•
Providequantifiable metricsfor SLAs•
Enable data-driven decision making•
KPI thresholdsincrease financial risk•
High targets may beimpossible to achieve•
Measurement scope affects cost and resources•
Well-defined criteria minimize optimization effort•
Careful selectionbased on requirements•
Balance between coverage and resource usage•
Consideruser impactfor each KPI•
Use recommended KPIs for cluster acceptance•
Comprehensive resourcefor LTE metrics•
Standardized measurement approaches•
Clear definitions and formulas•
Guidance oncommercial implications•