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UTRAN Key Performance Indicators 20040515

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IntroductionThese slides focus only on initial UTRAN KPIs. There is a comprehensive list of raw counters from which these initial KPIs are produced.

The counters as well as KPIs will continuously beredefined and updated.

2

UTRAN KPI Overview

Call Setup Success Rate Call Drop Rate of Signaling Plane Call Drop Rate of User Plane Signaling Congestion Rate Traffic Congestion Rate Soft Handover Success Rate Hard Handover Success Rate Inter-RAT Hard Handover Success Rate

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Contents

Call Setup Call Drop Congestion Handover Traffic

4

Call Setup Success Rate

Formula of Call Setup Success Rate:Call Setup Success Rate = RRCSetupSuccRate RABSetupSuccRate 100%

Can be divided into two parts: CS&PS For four types of QoS:

Conversational (e.g. voice and video) Streaming (e.g. streaming video or audio) Interactive (e.g. browsing) Background (e.g. emails or file download)

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RRC Setup Success Rate

The formula of RRC Setup Success Rate:RRC Setup Success Rate = RRC Connection Setup Success / RRC Connection Request 100%

RRC Setup Reject Causes:

Congestion (Walsh, Power, CE, etc.)

Unspecified (mostly transmission or NodeB problem)

Other RRC Setup failure reason

UE cant receive RRC CONNECTION SETUP

NodeB cant receive RRC CONNECTION SETUP COMPLETE

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RRC Connection SetupUE RRC NODEB RRC Connection Request SRNC RRC

NBAP

Radio Link Setup Requset

NBAP

NBAP

Radio Link Setup Response

NBAP

RRC

RRC Connection Setup

RRC

RRC

RRC Connection Setup Complete

RRC

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ExampleRRC_REQ 3332

RRC_REJ RRC_REJ_CONGRRC_SETUP RRC_SETUP_SUCC RRC_SETUP_SUCC_RATE

203330 3184

95.56%

UE

cant receive RRC CONNECTION SETUP

The downlink channel transmit power is not enough or the UE receive sensitivity is not good.NodeB

cant receive RRC CONNECTION SETUP COMPLETE

The UE transmit power is not enough or the NodeB receive sensitivity is notgood.8

RAB Setup Success Rate

The formula of RAB Setup Success Rate:RAB Setup Success Rate = RAB Assignment Success / RAB Assignment Request 100%

Can be divided into two parts, for four types of QoS RAB Setup Failure Causes:

Parameter violation Non supported UTRAN capabilities Relocation triggered Transport connection failed to establish

Unavailable resourcesProtocol error

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RAB Setup Flow ChartUE NodeB SRNC RANAP NBAP NBAP NBAP RRC RRC RL Reconfig Prepare RL Reconfig Ready RL Reconfig Commit RB Setup RB Setup Complete NBAP NBAP NBAP RRC RRC RANAP RAB Assignment Response RANAP RAB Assignment Request CN RANAP

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ExampleRB_SETUP RB_SETUP_SUCC 1057 1054

CS_RAB_REQ_SETUP_CONVCS_RAB_SETUP_SUCC_CONV PS_RAB_REQ_SETUP_BKG PS_RAB_SETUP_SUCC_BKG CS_RAB_SETUP_SUCC_RATE_CONV

982979 75 75

99.69% 100.00% 99.72%

PS_RAB_REL_SUCC_RATE_BKGRB_SETUP_SUCC_RATE_CONV

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Contents

Call Setup Call Drop Congestion Handover Traffic

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Call Drop Rate of Signaling Plane

Call Drop Rate of Signaling Plane is calculated by counting RNC-originated Iu connection release. Can be divided into two parts: CS&PS RNC-originated Iu connection release Causes:

OM intervention User inactivity Repeated integrity checking failure UE generated signaling connection release

RL out-of-synchronization

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Call Drop Rate of Signaling Plane

The formula of Call Drop Rate of CS Signaling Plane:Call Drop Rate of CS Signaling Plane = RNC-originated CS Domain Iu Connection Release / RNC-originated CS Domain Iu Connection Setup Success 100%

The formula of Call Drop Rate of PS Signaling Plane:Call Drop Rate of PS Signaling Plane = RNC-originated PS DomainIu Connection Release / RNC-originated PS Domain Iu Connection Setup Success 100%

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RNC-originated Iu connection release Flow Chart

SRNC RANAP RANAP RANAP Iu Release Request Iu Release Command Iu Release Complete

CN RANAP RANAP RANAP

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ExampleRNC_CS_IU_REL RNC_CS_IU_REL_DUP_INTEG RNC_CS_IU_REL_OM RNC_CS_IU_REL_RL_FAIL RNC_CS_IU_REL_SIG_REL RNC_CS_IU_REL_UE_INACT RNC_CS_IU_SETUP Call Drop Rate of CS Signaling 50 RNC_PS_IU_REL 0 RNC_PS_IU_REL_DUP_INTEG 0 RNC_PS_IU_REL_OM 26 RNC_PS_IU_REL_RL_FAIL 5 RNC_PS_IU_REL_SIG_REL 0 RNC_PS_IU_REL_UE_INACT 3085 RNC_PS_IU_SETUP 1.62% Call Drop Rate of PS Signaling 51 0 0 18 22 0 251 20.32%

For For

Call Drop Rate of PS Signaling, the main reason is wrong APN configuration in UE RL_FAIL, need optimize poor coverage and neighbors, 3G-2G handover

also can improve this indicator16

Call Drop Rate of User Plane

Call Drop Rate of User Plane is calculated by

counting RNC-originated RAB releases.

Can be divided into two parts, for four types of QoS

RNC-originated RAB release Causes:

OM intervention UTRAN generated reason RAB preempted

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Call Drop Rate of User PlaneThe formula of Call Drop Rate of CS User Plane:Call Drop Rate of CS User Plane = RNC-originated CS Domain RAB Release / RNC-originated CS Domain RAB Setup Success 100%

The formula of Call Drop Rate of PS User Plane:Call Drop Rate of PS User Plane = RNC-originated PS Domain RAB Release / RNC-originated PS Domain RAB Setup Success 100%

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RNC-originated RAB release CauseUE SRNC RANAP RANAP RANAP RRC RRC RRC Connection Release RRC Connection Release Complete RRC RRC RAB Release Request Iu Release Command Iu Release Complete CN RANAP RANAP RANAP

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ExampleCS_RAB_SETUP_SUCC_CONV PS_RAB_SETUP_SUCC_BKG RNC_CS_RAB_REL_REQ_CONV RNC_PS_RAB_REL_REQ_BKG Call Drop Rate of CS User Plane 979 75

4 4 0.41% 5.33%

Call Drop Rate of PS User Plane

For

CS/PS_RAB_REL, need optimize poor coverage and neighbors, 3G-2G handover

also can improve this indicator

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Contents

Call Setup Call Drop Congestion Handover Traffic

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Signaling Congestion RateThe formula of Signaling Congestion Rate:Signaling Congestion Rate = RRC Connection Reject (Cause: congestion) / RRC Connection Request 100%

UE

NodeB

RNC

RRC RRC

RRC Connection Request RRC Connection Reject (Cause : Congestion)

RRC RRC

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Traffic Congestion RateTraffic Congestion Rate is calculated by counting

the RAB Assignment Setup Failure (cause:congestion).

Can be divided into two parts: CS&PS

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Traffic Congestion Rate

The formula of CS Traffic Congestion Rate:CS Traffic Congestion Rate = CS Domain RAB Assignment SetupFailure (Congestion) / CS Domain RAB Assignment Setup Request 100%

The formula of PS Traffic Congestion Rate:PS Traffic Congestion Rate = PS Domain RAB Assignment Setup Failure (Congestion) / PS Domain RAB Assignment Setup Request 100%

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Traffic Congestion Rate

SRNC

CN

RANAP

RAB Assignment Request

RANAP

RANAP

RAB Assignment Response (Failure cause: Congestion)

RANAP

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Contents

Call Setup Call Drop Congestion Handover Traffic

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Soft (Softer) Handover Success Rate

The formula of Soft (Softer) Handover Success Rate:Soft (Softer) Handover Success Rate = Soft (Softer) Handover Success / Soft (Softer) Handover Request 100%

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Soft (Softer) Handover Flow ChartUE New NodeB SRNC

NBAP

Radio Link Addition Request

NBAP

NBAP

Radio Link Addition Response

NBAP

RRC

DCCH : Active Set Update

RRC

RRC

DCCH : Active Set Update Complete

RRC

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SHO Failure Causes

When the UE handles the ACTIVE SET UPDATE message, the abnormal cases may be occurred and the UE shall transmit an

ACTIVE SET UPDATE FAILURE message with the following failurecauses

Configuration unsupported Incompatible simultaneous reconfiguration Protocol error Invalid configuration

If the time expired before RNC receives the message ACTIVE SET

UPDATE COMPLETE or ACTIVE SET UPDATE FAILURE from UE,RNC increases the SHO failure counter with the following cause

No response from UE

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SHO Failure Flow ChartUE New NodeB SRNC

NBAP NBAP

Radio Link Addition Request Radio Link Addition Response

NBAP NBAP

RRC RRC

DCCH : Active Set Update DCCH : Active Set Update Failure

RRC RRC

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Example

SHO_EVAL_REQ

5652

SHOSHO_SUCC SOFTERHO SOFTERHO_SUCC SHO_SUCC_RATE

55115500 1411 1411 99.8%

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Hard Handover Success Rate

The formula of Hard Handover Success Rate:Hard Handover Success Rate = Hard Handover Success / HardHandover request 100%

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Hard Handover Flow ChartUE Source NodeB Target NodeB NBAP Radio Link Setup Request SRNC NBAP

NBAP

Radio Link Setup Reponse

NBAP

RRC NBAP RRC

DCCH : Physical Channel Reconfiguration Radio Link Failure Indication

RRC NBAP RRC

DCCH : Physical Channel Reconfiguration Complete

NBAP

Radio Link Deletion Request

NBAP

NBAP

Radio Link Delete Response

NBAP

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Hard Handover Failure Cause

The detail hard handover failure cause statistics include two hard handover directions on the cell object :

outgoing hard handover initiated by RNC in each original cell. incoming hard handover in