1) The document describes key performance indicators (KPIs) for measuring the performance of an LTE radio network. It defines KPIs related to accessibility, retainability, mobility, and latency. 2) Accessibility KPIs measure aspects like call setup success rate, RRC setup success rate, and E-RAB setup success rate. Mobility KPIs evaluate handover success rates within LTE and between LTE and other technologies. 3) Retainability KPIs track metrics such as call drop rate and call setup completion rate. The document also provides details on how to calculate each KPI and which counters are needed to measure the underlying events.

1. http://www.linkedin.com/pub/ray-khastur/36/965/b7a
KPI in LTE Radio Network

2. 4G LTE - RF Optimization Objects and Target Baseline | Page 2
KPI System Overview
LTE KPIs
Accessability Retainability IntegrityMobility Latency
• RRC
SETUP SR
• ERAB
Setup SR
(VoIP/ALL)
• Call Setup
SR
(VoIP/ALL)
• Call Drop
Rate
(VoIP/ALL)
• Call Setup
Complete
Rate
(VoIP/ALL)
• Service
UL/DL
Throughput
• HHO SR
( Intra/Inter
Frequency)
• HO in SR
• Inter-RAT
HHO SR
• Access
Latency
• Service
Latency
• Interrupt
Latency
• Radio
Network
Unavailabil
ity Rate
Availability
• Cell UL/DL
Traffic
Volume
• Radio
Bearer
Number
Utilization
Radio Network KPI :
Focus on the radio network performance
Service KPI :
Focus on the user experience
• UL/DL
RB
Utility
Rate
Traffic

3. 4G LTE - RF Optimization Objects and Target Baseline | Page 3
Accessibility (1) – RRC Setup Success Rate
 RRC Setup Success Rate (service)
The RRC setup procedure is trigged by different reasons as identified by the establishmentCause field in
the RRCConnctionRequest message: emergency, highPriorityAccess, mt-Access, mo-Signalling, mo-Data,
delayTolerantAccess-v1020.
The UE sets the establishmentCause and received by eNodeB. Causes except mo-Signalling are
categorized as service related ones, and the cause of mo-Signalling is categorized as signal related ones.
This KPI evaluates the RRC setup success rate with service related causes in a cell or cluster.
%100
_
_
_ Service 
service
service
AttemptConnectionRRC
SuccessConnectionRRC
SSRRRC
 RRC Setup Success Rate (Signal)
This KPI evaluates the RRC setup success rate with signal related
causes (mo-Signalling) in a cell or cluster.
%100
_
_
_ Signal 
Signal
Signal
AttemptConnectionRRC
SuccessConnectionRRC
SSRRRC

4. 4G LTE - RF Optimization Objects and Target Baseline | Page 4
Accessibility (2) – Counter Mapping for RRC SSR
L.RRC.ConnReq.Att…
L.RRC.ConnReq.Succ …

5. 4G LTE - RF Optimization Objects and Target Baseline | Page 5
Accessibility (3) – QCI Definition
 LTE-SAE QoS Class Identifier
There are 9 QCIs defined in 3GPP TS 23.203. Each of QCI has its QoS requirements, and each E-RAB will
has the attribute of QCI.

6. 4G LTE - RF Optimization Objects and Target Baseline | Page 6
Accessibility (4) – ERAB Setup Success Rate
VoIP ERAB Setup Success Rate
This KPI can be used to evaluate the ERAB setup success
rate of VoIP service (QCI 1 service) in a cell or cluster.
_ _
_ _ 100%
_ _
VoIP ERAB SetupSuccess
VoIP ERAB SSR
VoIP ERAB SetupAttempt
 
 ERAB Setup Success Rate (All)
This KPI can be used to evaluate the ERAB setup success
rate of all services including the VoIP service in a cell or
a cluster.
_
_ ( ) 100%
_
ERAB SetupSuccess
ERAB SSR ALL
ERAB SetupAttempt
 

7. 4G LTE - RF Optimization Objects and Target Baseline | Page 7
Accessibility (5) – Counter Mapping for ERAB SSR
ERAB Setup Attempt
Counters
ERAB Setup Success Counters
ERAB Setup Attempt
Counters
ERAB Setup Success Counters

8. 4G LTE - RF Optimization Objects and Target Baseline | Page 8
Accessibility (6) – Call Setup Success Rate
_ 1 _
( ) * * 100%
_ 1 _
Service
Service
RRC ConnectionSuccess S SIGConnectionEstablishSuccess ERAB SetupSuccess
CSSR ALL
RRC ConnectionAttempt S SIGConnectionEstablishAttempt ERAB SetupAttempt
 
VoIP Call Setup Success Rate (VoIP CSSR)
This KPI evaluates the success rate of the whole setup procedure for VoIP service (QCI 1
service) in a cell or cluster, which mainly includes three phases : RRC setup phase, S1
Signaling connection establishment phase and VoIP E-RAB setup phase:
_ 1 _ _
_ * * 100%
_ 1 _ _
Service
Service
RRC ConnectionSuccess S SIGConnectionEstablishSuccess VoIP ERAB SetupSuccess
VoIP CSSR
RRC ConnectionAttempt S SIGConnectionEstablishAttempt VoIP ERAB SetupAttempt
 
Call Setup Success Rate (ALL)
This KPI can be used to evaluate the call setup success rate of all services including the VoIP
service in a cell or a cluster. This KPI mainly includes three phases : RRC setup phase, S1 Signaling
connection establishment phase and service E-RAB setup phase:

9. 4G LTE - RF Optimization Objects and Target Baseline | Page 9
Accessibility (7) – Counter Mapping for CSSR

10. 4G LTE - RF Optimization Objects and Target Baseline | Page 10
Retainability (1) – Call Drop Rate
VoIP Call Drop Rate
This KPI can be used to evaluate the call drop rate of VoIP service (QCI 1 service) in a cell or cluster, the call drops
happen when eNode initiate active ERAB (with data in buffer) release process by E-RAB Release Indication or UE
Context Release Request message with Cause field with abnormal reasons (the cause other than : Normal Release,
Detach,User Inactivity, cs fallback triggered, UE Not Available For PS Service,or Inter-RAT redirection), and all of the
other E-RAB releases are consider as normal E-RAB release.
Call Drop Rate(ALL)
This KPI can be used to evaluate the call drop rate of all services in
a cell or a cluster, including VoIP service.
%100
Re__
Re__
_ 
leaseERABVoIP
leaseAbnormalERABVoIP
CDRVoIP
_ Re
( ) 100%
_ Re
ERAB Abnormal lease
CDR ALL
ERAB lease
 
Call Drop Rate(Always Online)
This KPI can be used to evaluate the call drop rate of all the services, including the VoIP services, when the always
online state is active. In always online state, the E-RAB number of UE entering the un-synchronous state from
synchronous state will be considered for the KPI calculating.
_ 100%
Re
ERABAbnormalReleaseOfAlwaysOnline
AlwaysOnline CDR
ERAB leaseOfAlwaysOnline
 

11. 4G LTE - RF Optimization Objects and Target Baseline | Page 11
Retainability (2) – Counter Mapping for Call Drop Rate
Normal and Abnormal
release Counters based on
the cause
Normal and Abnormal
release Counters based on
the cause

12. 4G LTE - RF Optimization Objects and Target Baseline | Page 12
Retainability (3) - Call Setup Complete Rate
_ 1 _ _ Re
( ) * * * 100%
_ 1 _ _ Re
Service
Service
RRC ConnectionSuccess S SIGConnectionEstablishSuccess ERAB SetupSuccess ERAB Normal lease
CSTR ALL
RRC ConnectionAttempt S SIGConnectionEstablishAttempt ERAB SetupAttempt ERAB lease
 
_ 1 _ _ _ _ Re
_ * * *
_ 1 _ _
Service
Service
RRC ConnectionSuccess S SIGConnectionEstablishSuccess VoIP ERAB SetupSuccess VoIP ERAB Normal lease
VoIP CSTR
RRC ConnectionAttempt S SIGConnectionEstablishAttempt VoIP ERAB SetupAttempt Vo
 100%
_ _ ReIP ERAB lease

VoIP Call Setup Complete Rate (VoIP CSTR)
This KPI evaluates the call Setup Complete Rate for VoIP service (QCI 1 service) in a cell or cluster,
which means the rate of the VoIP service can be normally terminated once user do the attempt to
setup the service. And it can include 4 phases: RRC setup phase, S1 Signaling connection
establishment phase, VoIP E-RAB setup phase and VoIP service E-RAB release phase;
Call Setup Complete Rate (ALL)
The similar as upper KPI, this KPI will evaluate the success rate in totally for 4 phases: RRC setup phase,
S1 Signaling connection establishment phase, service E-RAB setup phase and service E-RAB release
phase;
Call Setup Complete Rate (Always Online)
The similar as upper KPI, this KPI will evaluate the success rate in totally for 4 phases: RRC setup phase,
S1 Signaling connection establishment phase, service E-RAB setup phase and service E-RAB release
phase (when the always online state is active);
_ 1 _
( ) * * *
_ 1 _
Service
Service
RRC ConnectionSuccess S SIGConnectionEstablishSuccess ERAB SetupSuccess ERABAbnormalReleaseOfAlway
CSTR AlwaysOnline
RRC ConnectionAttempt S SIGConnectionEstablishAttempt ERAB SetupAttempt
 100%
Re
sOnline
ERAB leaseOfAlwaysOnline


13. 4G LTE - RF Optimization Objects and Target Baseline | Page 13
Retainability (4) - Counter Mapping for CSCR

14. 4G LTE - RF Optimization Objects and Target Baseline | Page 14
Mobility (1) – Intra-LTE Handover (Out) Success Rate
Intra-frequency Handover Out Success Rate
This KPI can be used to evaluate the intra-frequency handover
out success rate in a cell or cluster.
%100
_
_
__ 
ptHOOutAttemIntraF
ssHOOutSucceIntraF
SRHOOutIntraF
Inter-frequency Handover Out Success Rate
This KPI can be used to evaluate the inter-frequency handover
out success rate in a cell or cluster.
%100
_
_
__ 
ptHOOutAttemInterF
ssHOOutSucceInterF
SRHOOutInterF

15. 4G LTE - RF Optimization Objects and Target Baseline | Page 15
Mobility (2) – Counter Mapping for Intra-LTE HO SR
Handover Attempt Counters
Handover Success Counters

16. 4G LTE - RF Optimization Objects and Target Baseline | Page 16
Mobility (3) - Intra-LTE Handover In Success Rate
Handover In Success Rate
This KPI can be used to evaluate the handover in success
rate in a cell or cluster.
%100_ 
tHOInAttemp
sHOInSucces
SRHOIn

17. 4G LTE - RF Optimization Objects and Target Baseline | Page 17
Mobility (4) - Counter Mapping for Intra-LTE HO In SR
HO in Attempt Counters
HO in Success Counters

18. 4G LTE - RF Optimization Objects and Target Baseline | Page 18
Mobility (5) – Inter-RAT Handover Success Rate
%100
_2_
_2_
_2_ 
AttemptOutGLIRATHO
SuccessOutGLIRATHO
SRGLIRATHO out
Inter-RAT Handover Success Rate (LTE to WCDMA)
This KPI can be used to evaluate the inter-RAT handover success rate
from LTE to WCDMA in a cluster.
%100
_2_
_2_
_2_ 
AttemptOutWLIRATHO
SuccessOutWLIRATHO
SRWLIRATHO out
Inter-RAT Handover Success Rate (LTE to GERAN)
This KPI can be used to evaluate the inter-RAT handover success rate from LTE to GERAN in a cluster.

19. 4G LTE - RF Optimization Objects and Target Baseline | Page 19
Mobility (6) – Inter-RAT Handover Success Rate
Inter-RAT Handover Success Rate (LTE to CDMA2000)
This KPI can be used to evaluate the inter-RAT handover success rate from
LTE to CDMA2000 in a cluster.
_ 2 _
_ 2 _ 100%
_ 2 _
out
IRATHO L C SuccessOut
IRATHO L C SR
IRATHO L C AttemptOut
 

20. 4G LTE - RF Optimization Objects and Target Baseline | Page 20
Mobility (7) – Counter Mapping for Inter-RAT HO SR
B point , HO attempt, and
distinguish the target system by an
element “targetRAT-Type ” in the
message
C point, HO
Success