Key Performance Indicators

• This Documents discuss important KPIs, their calculation description of counters that are used in

calculation.

• All These KPIs are the measure of subscribers perceived quality and system performance.

• Following KPI categories we need to monitor

Accessibility Retainability Integrity Availability Mobility

KPIS: Summary

Accessibility

Initial E-RAB Establishment Success Rate

Added E-RAB Establishment Success Rate

RRC Failure Rate

Paging Discard Rate

Random Access Success Rate

CUL Use Distribution

Accessibility Failure Rate Due to CUL

Retainability

E-RAB Drop Rate

ENB E-RAB Drop Rate

MME E-RAB Drops Rate

E-RAB Drops per Second

E-RAB Minutes per Drop

Availability

Cell Auto Locked

Cell Manually Locked

Cell Availability

Congestion

Session Time

Mobility

EUTRAN Mobility

%age of UEs Leaving LTE Network

Integrity

Traffic Volume

Throughput DL

Throughput UL

Latency

Packet Loss

Connected Users

Accessibility – E-RAB establishment

Accessibility for EUTRAN is a measure of the ability of a user to obtain an E-RAB.

Initial E-RAB establishment process can be divided into the following phases:

• RRC Connection Establishment

• S1 Signaling Connection Establishment

• Initial E-RAB Establishment or E-RAB Addition

Added E-RAB Establishment Success Rate measure the success rate of subsequently added

E-RABs

Initial E-RAB Establishment Success Rate [%]

= pmRrcConnEstabSucc * pmRrcConnEstabSucc * pmErabEstabSuccInit * 100

(pmRrcConnEstabAtt -pmRrcConnEstabAttReatt ) pmS1SigConnEstabAtt pmErabEstabAttInit

Added E-RAB Establishment Success Rate [%]

= pmErabEstabSuccAdded * 100

PmErabEstabAttAdded

Accessibility – E-RAB establishment

Initial E-RAB Establishment Success Rate [%]

Added E-RAB Establishment Success Rate [%]

Accessibility – E-RAB establishment RRC setup is part of E-RAB establishment process and its failure gives an important

measurement index about call

RRC Failure Rate [%]

= (1 - pmRrcConnEstabSucc ) * 100

pmRrcConnEstabAtt

Counter Summary Description

pmRrcConnEstabAtt Total number of RRC Connection Request attempts per cell

pmRrcConnEstabSucc Total number of successful RRC Connection Establishment per cell

pmRrcConnEstabAttReatt Total number of RRC Connection Request attempts that are considers as re-attempts

pmS1SigConnEstabAtt This measurement provides the number of S1 Signaling connection establishment

attempts for any establishment cause per cell.

pmS1SigConnEstabSucc Total number of successful S1 signaling connection establishment per cell.

pmErabEstabAttInit Total number of initial E-RAB Establishment attempts per cell. Initial E-RABs are all

E-RABs present in Initial Context Setup Request.

pmErabEstabSuccInit Total number of successful initial E-RAB Establishments per cell.

pmErabEstabAttAdded Total number of added E-RAB Establishment attempts per cell.

pmErabEstabSuccAdded Total number of successfully added E-RABs per cell.

Accessibility – Paging Paging is used by the network to communicate with UE in idle mode. UE monitors the Physical Downlink Control

Channel (PDCCH) at regular intervals, to check for the presence of a Paging message

Paging Discard Rate [%]

= ( pmPagDiscarded ) * 100

pmPagreceived

Counter Summary Description

pmPagDiscarded Tracks the number of Paging messages from core network that are not distributed

to cells within the RBS due to congestion on the Paging channels

pmPagReceived Tracks the total number of Paging messages received from the core network.

Counter increments when a correct and complete message is received from an

MME.

Business Object Report Busy Hour

Accessibility – Random Access Main purpose of Random Access is to allow user equipment to obtain new or renewed access to the network and to

obtain uplink synchronization. It is mostly performed during initial access to the network from RRC_IDLE state and

handover between the cells.

Random Access Rate [%]

= ( pmRaSuccCbra ) * 100

pmRaAttCbra

Counter Summary Description

pmRaSuccCbra Number of successfully detected Random Access messages from Contention Based RA.

pmRaAttCbra Number of detected contention-based random access preambles. The counter is

incremented whenever a CBRA preamble is detected in the cell..

Business Object Report Busy Hour

Accessibility – Connected User License According to 3GPP definition a Connected User (CU) in LTE is one that is in RRC_CONNECTED state.

Maximum number of Connected Users allowed in the eNodeB can be viewed with licenseCapacityConnectedUsers

ready only parameter which reflects the Connected User License (CUL) capacity value in the eNodeB.

CUL Use Distribution

= pmLicConnectedUsersDistr

Accessibility Failure Rate due to CUL

= ( pmRrcConnEstabFailLic ) * 100

pmRrcConnEstabAtt

Accessibility failure rate due to CUL can be found as:.

Accessibility – Connected User License

CUL Use Distribution

Accessibility Failure Rate due to CUL

Accessibility – Connected User License

Counter Summary Description

pmLicConnectedUserLicense Licensed value for connected users. Value reflects capacity value in license key

file.

pmLicConnectedUsersDistr PDF counter that shows utilization for number of connected users in RBS

pmRrcConnEstabAtt Total number of RRC Connection Request attempts per cell.

pmRrcConnEstabFaiLic Total number of failed RRC Connection Establishments due to lack of connected

users license

Retainability – Drop Rate

Retainability is defined as the ability of a user to retain the E-RAB once connected.

Abnormal E-RAB Release Rate in drops per second can be calculated as below

ERAB Drop Rate [%]

= (pmErabRelAbnormalEnbAct+pmErabRelMmeAct)* 100

(pmErabEstabSuccInit + PmErabEstabSuccAdded)

ENB: ERAB Drop Rate [%]

MME: ERAB Drop Rate [%]

= (pmErabRelAbnormalEnbAct) * 100

(pmErabEstabSuccInit + PmErabEstabSuccAdded)

= (pmErabRelMmeAct) * 100

(pmErabEstabSuccInit + PmErabEstabSuccAdded)

Retainability – Drop Rate

Retainability is defined as the ability of a user to retain the E-RAB once connected.

Abnormal E-RAB Release Rate in drops per second can be calculated as below

ERAB Drop Rate [%]

ENB: ERAB Drop Rate [%]

MME: ERAB Drop Rate [%]

Integrity – Throughput

Statistical Definition of DL and UL Throughput