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CS KPIs

CS KPIs Internal Use Only▲

About This Document

Summary

Chapter Description

1 Overview Introduces the KPI classification and application.

2 CS Statistical KPIs Lists the CS statistical KPIs.

3 CS Test KPIs Lists the CS test KPIs.

4 CN CS KPIs Lists the CN CS KPIs.

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TABLE OF CONTENTS

1 Overview.............................................................................................................1

2 CS Statistical KPIs.............................................................................................22.1 Availability............................................................................................................22.1.1 SDCCH Availability........................................................................................22.1.2 TCH in service rate(%)...................................................................................22.2 Accessibility.........................................................................................................32.2.1 Random Access Success Rate.....................................................................32.2.2 SDCCH Blocking Rate...................................................................................42.2.3 TCH Blocking Rate........................................................................................42.2.4 SDCCH Drop Rate.........................................................................................52.2.5 SDCCH Assignment Success Rate...............................................................62.2.6 TCH Assignment Success Rate....................................................................62.2.7 Call Setup Success Rate (CSSR)..................................................................72.3 Mobility................................................................................................................82.3.1 Handover Success Rate................................................................................82.3.2 Handover Success Rate (Intra Cell)..............................................................92.3.3 Handover Success Rate (Inter Cell)..............................................................92.3.4 Handover Success Rate (Inter BSC).............................................................92.3.5 Handover Due to Quality.............................................................................102.4 Reliability...........................................................................................................102.4.1 Call Drop Rate.............................................................................................102.4.2 UL RxQual 0-4.............................................................................................112.4.3 DL RxQual 0-4.............................................................................................112.4.4 UL RxQual 0-3.............................................................................................122.4.5 DL RxQual 0-3.............................................................................................122.4.6 FER..............................................................................................................13

3 CS Test KPIs....................................................................................................143.1 Accessibility.......................................................................................................143.1.1 Call Setup Success Rate.............................................................................143.2 Mobility..............................................................................................................143.2.1 Handover Success Rate..............................................................................143.3 Reliability...........................................................................................................143.3.1 CDR CMCC.................................................................................................143.3.2 CDR_MOD...................................................................................................143.3.3 Drop Call Rate.............................................................................................153.3.4 SQI...............................................................................................................153.3.5 Mean Opinion Score (MOS)........................................................................163.3.6 Rx Quality (0-3 and 0-4)..............................................................................16

4 CN CS KPIs......................................................................................................174.1 Paging Success Rate........................................................................................174.2 T305 & T308 Timers..........................................................................................194.3 Location Update Success Rate.........................................................................19

ZTE Confidential Proprietary © 2023 ZTE CORPORATION. All rights reserved. II


1 Overview

The guide is mostly applicable to V6.20 (Minos).

This guidebook collected the Key Performance Indicators (KPI) for CS and PS, which are now commonly adopted in presales bidding projects; and the definitions of different KPIs and counter formulas for V6.2 is described here as well.

Generally, KPIs can be classified into four types: statistical KPIs, testing KPIs, equipment performance KPIs, and user perception KPIs. Only statistical KPIs and testing KPIs are elaborated here. KPI involves different factors. It is also closely related to the network radio environment.

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2 CS Statistical KPIs

2.1 Availability

2.1.1 SDCCH Availability

KPI SDCCH availability

KPI Definition

Number of available SDCCHs 100%/(Number of available SDCCHs + number of unavailable SDCCHs)

KPI Formula

V6.2T C900060122 100%/(C900060122 + C900060123)

Notes

The ratio of the available SDCCHs to the SDCCHs allocated in network is mainly used to check the equipment performance, especially to inspect the availability of SDCCHs of the cells. It is directly related to the stability of equipment, transmission and power supply. It reflects the availability ratio of network equipment and the stability of the network operation.

Counter Description

C900060122: Average number of available SDCCHC900060123: Average number of unavailable SDCCH

2.1.2 TCH in service rate(%)

KPI TCH in service rate(%)

KPI Definition

Number of available TCHs 100%/(Number of available TCHs + number of unavailable TCHs)

KPI Formula

V6.2(C900060125 + C900060134 + C900060155) 100%/(C900060125 + C900060134 + C900060155 + C900060126 + C900060217 + C900060218)

Notes

The ratio of the in service TCHs to the TCHs allocated in network is mainly used to check the equipment performance, especially to inspect the availability of TCHs of the cells. It is directly related to the stability of equipment, transmission and power supply.

Counter Description

C900060125: Average number of available radio channel C900060126: Average number of unavailable radio channel C900060134: Number of available defined TCH/F C900060155: Number of available defined TCH/H C900060217: Number of unavailable defined TCH/H C900060218: Number of unavailable defined TCH/F



2.2 Accessibility

2.2.1 Random Access Success Rate

KPI Random access success rate

KPI Definition

Number of random access successes 100%/Number of random access call attempts

KPI Formula

V6.2(C900060008 + C900060014 + (C900060038 – C900060039 – C900060174)) 100%/(C900060003 + C900060010 + C900060038)

Notes

This indicator is related to not only SD congestion but also SD channel activation. The influencing factors include SD congestion, carrier hardware malfunction, transmission delay or malfunction, and CMB hardware malfunction.

Counter Description

C900060003: Number of SDCCH seizure attempts for assignment C900060008: Number of SDCCH allocation success for assignment C900060010: Number of signaling TCH/F seizure attempts for assignment C900060014: Number of signaling TCH/F allocation success for assignment C900060038: Number of signaling TCH/H seizure attempts for assignment C900060039: Number of signaling TCH/H seizure failure for assignment C900060174: Number of signaling TCH/H allocation failure for assignment

2.2.2 SDCCH Blocking Rate



KPI SDCCH blocking rate

KPI Definition

Number of signaling channel congestions 100%/Number of signaling channel call attempts, including the condition when SDCCHs and TCHs are used as signaling channels.

KPI Formula

V6.2(C900060005 + C900060011 + C900060039) 100%/(C900060003 + C900060010 + C900060038)

Notes

This is mainly to evaluate the consistency between the preplanned network and the actual network. It will be affected by the following factors: 1. The consistency between the desired capacity and actual capacity of the network; and the consistency between the estimated traffic model and the actual one. 2. Sudden traffic. 3. Lack of SDCCH capacity. 4. Internal & external interference. 5. Preplanned redundancy. 6. Operators’ special requirements. 7. FR and HR used as signaling channel.

Counter Description

C900060003: Number of SDCCH seizure attempts for assignment C900060005: Number of SDCCH seizure failure for assignment C900060010: Number of signaling TCH/F seizure attempts for assignment C900060011: Number of signaling TCH/F seizure failure for assignment C900060038: Number of signaling TCH/H seizure attempts for assignment C900060039: Number of signaling TCH/H seizure failure for assignment

2.2.3 TCH Blocking Rate

KPI TCH blocking rate

KPI Definition

Formula 1 (default): Number of TCH congestions (including HO) 100%/Number of TCH call attempts (including HO)

Formula 2: Number of TCH congestions (excluding HO) 100%/Number of TCH call attempts (excluding HO)

KPI Formula

V6.2 Formula 1 (default): (C900060020 + C900060031 + C900060043 + C900060047 + C900060022 + C900060033 + C900060045 + C900060049) 100%/(C900060019 + C900060030 + C900060042 + C900060046 + C900060021 + C900060032 + C900060044 + C900060048)It includes handovers.

Formula 2:(C900060020 + C900060031 + C900060043 + C900060047) 100%/(C900060019 + C900060030 + C900060042 + C900060046)



It excludes handovers.

Notes

This is mainly to evaluate the consistency between the preplanned network and actual network, and the precondition is that the precise traffic model, network capacity and redundancy should be provided in the preplanning period. It is related to the following factors: 1. The consistency between the desired capacity and actual capacity of the network; and the consistency between the estimated traffic model and the actual one. 2. Sudden traffic. 3. Lack of TCH capacity. 4. Internal & external interference. 5. Preplanned redundancy.

Counter Description

C900060019: Number of voice TCH/F seizure attempts for assignment C900060020: Number of voice TCH/F seizure failure for assignment C900060021: Number of voice TCH/F seizure attempts for handover C900060022: Number of voice TCH/F seizure failure for handover C900060030: Number of data TCH/F seizure attempts for assignment C900060031: Number of data TCH/F seizure failure for assignment C900060032: Number of data TCH/F seizure attempts for handover C900060033: Number of data TCH/F seizure failure for handover C900060042: Number of voice TCH/H seizure attempts for assignment C900060043: Number of voice TCH/H seizure failure for assignment C900060044: Number of voice TCH/H seizure attempts for handover C900060045: Number of voice TCH/H seizure failure for handover C900060046: Number of data TCH/H seizure attempts for assignment C900060047: Number of data TCH/H seizure failure for assignment C900060048: Number of data TCH/H seizure attempts for handover C900060049: Number of data TCH/H seizure failure for handover

2.2.4 SDCCH Drop Rate

KPI SDCCH drop rate

KPI Definition

Formula 1 (default):Number of SDCCH call drops 100%/(Random access call attempts + number of voice channel call attempts (handover excluded) (signaling))

Formula 2 (recommended): Number of SDCCH call drops 100%/Number of SDCCH assignments success

KPI Formula

V6.2

Formula (default): C900060053 100%/(C900060003 + C900060010 + C900060038)

Notes Formula 1 is the old one in the previous Guide. Its problem is that the numerator does not include the number of call drops but the denominator includes the number of call attempts when TCH is used as



signaling. Theoretically, call drop always occurs after successful channel assignment. Then the denominator should be the number of SDCCH assignment successes instead of the number of SDCCH attempts.

Counter Description

C900060003: Number of SDCCH seizure attempts for assignment C900060010: Number of signaling TCH/F seizure attempts for assignment C900060038: Number of signaling TCH/H seizure attempts for assignment C900060053: Number of SDCCH drops

2.2.5 SDCCH Assignment Success Rate

KPI SDCCH assignment success rate

KPI Definition

Formula 2 (recommended): (Number of MOC access successes + number of MTC access successes)/(Number of MOC access attempts + number of MTC access attempts)

KPI Formula

V6.2Formula :(C900060002 + C900060236)/(C900060001 + C900060136)

NotesSDCCH assignment success rate is involved with many factors, such as LAPD link, frequency interference, access parameters, and external interference.

Counter Description

C900060001: Number of MTC access attemptsC900060002: Number of MTC access success C900060136: Number of MOC access attempts C900060236: Number of MOC access success

2.2.6 TCH Assignment Success Rate

KPI TCH assignment success rate



KPI Definition

Number of TCH assignment successes 100/(Number of TCH assignment successes + number of TCH assignment failures)

KPI Formula

V6.2

(C900060028 + C900060036 + C900060199 + C900060210) 100%/(C900060028 + C900060036 + C900060199 + C900060210 + C900060029 + C900060037 + C900060200 + C900060211)

NotesThis KPI is directly related to radio environment, carrier problems, assignment methods, and application of data service. This formula does not include the condition when TCH is used as the signaling channel.

Counter Description

C900060028: Number of voice TCH/F assignment success C900060029: Number of voice TCH/F assignment failure for assignment C900060036: Number of data TCH/F assignment success C900060037: Number of data TCH/F assignment failure C900060199: Number of voice TCH/H assignment success C900060200: Number of voice TCH/H assignment failure C900060210: Number of data TCH/F assignment success C900060211: Number of data TCH/H assignment failure

2.2.7 Call Setup Success Rate (CSSR)

KPI Call setup success rate (CSSR)

KPI Definition

(1 – SDCCH blocking rate) (SDCCH assignment success rate) (1 – SDCCH drop rate) (1 – TCH blocking rate (excluding HO)) TCH assignment success rate

KPI Formula

V6.2

(1-C900060053/(C900060003+C900060010+C900060038))*(1-(C900060020+C900060031+C900060043+C900060047)/(C900060019+C900060030+C900060042+C900060046))*(1-(C900060018+C900060029+C900060037+C900060135+C900060200+C900060211)/(C900060017+C900060028+C900060036+C900060018+C900060029+C900060037+C900060235+C900060199+C900060210+C900060135+C900060200+C900060211))

NotesThe above stated formula is regarded too strict. Some may define it to be TCH assignment success rate or call completion rate.

Counter Description

C900060053 Number of SDCCH dropsC900060003 Number of SDCCH seizure attempts for assignmentC900060010 Number of signaling TCH/F seizure attempts for assignmentC900060038 Number of signaling TCH/H seizure attempts for assignmentC900060020 Number of voice TCH/F seizure failure for assignmentC900060031 Number of data TCH/F seizure failure for assignmentC900060043 Number of voice TCH/H seizure failure for assignmentC900060047 Number of data TCH/H seizure failure for assignmentC900060019 Number of voice TCH/F seizure attempts for assignmentC900060030 Number of data TCH/F seizure attempts for assignment



C900060042 Number of voice TCH/H seizure attempts for assignmentC900060046 Number of data TCH/H seizure attempts for assignmentC900060018 Number of signaling TCH/F assignment failure for assignmentC900060029 Number of voice TCH/F assignment failure for assignmentC900060037 Number of data TCH/F assignment failureC900060135 Number of signaling TCH/H assignment failureC900060200 Number of Voice TCH/H assignment failureC900060211 Number of data TCH/H assignment failureC900060017 Number of signaling TCH/F assignment success for assignmentC900060028 Number of voice TCH/F assignment successC900060036 Number of data TCH/F assignment successC900060018 Number of signaling TCH/F assignment failure for assignmentC900060029 Number of voice TCH/F assignment failure for assignmentC900060037 Number of data TCH/F assignment failureC900060235 Number of signaling TCH/H assignment successC900060199 Number of Voice TCH/H assignment successC900060210 Number of data TCH/H assignment successC900060135 Number of signaling TCH/H assignment failureC900060200 Number of Voice TCH/H assignment failureC900060211 Number of data TCH/H assignment failure

2.3 Mobility

2.3.1 Handover Success Rate

KPI Handover success rate

KPI Definition

Formula 1 (default): Number of handover successes in busy hours 100%/Number of handover requests in busy hours

KPI Formula

V6.2

Formula :(C900060098 + C900060102 + C900060120 + C900060094 + C900060096) 100%/(C900060097 + C900060099 + C900060100 + C900060101 + C900060216 + C900060119 + C900060093 + C900060095)

Notes None

Counter Description

C900060093: Number of BSC-controlled inter-cell outgoing handover C900060094: Number of BSC-controlled inter-cell outgoing handover success C900060095: Number of MSC-controlled outgoing handover C900060096: Number of MSC-controlled outgoing handover success C900060097: Number of BSC-controlled inter-cell incoming handover C900060098: Number of BSC-controlled inter-cell incoming handover success C900060099: Number of MSC-controlled incoming handover



C900060100: Number of MSC-controlled incoming handover due to forced releaseC900060101: Number of MSC-controlled incoming handover due to queue C900060102: Number of MSC-controlled incoming handover success C900060119: Number of Intra-cell handover C900060120: Number of Intra-cell handover success C900060216: Number of MSC-controlled incoming handover due to forced handover

2.3.2 Handover Success Rate (Intra Cell)KPI Handover success rate (Intra Cell)

KPI Definition

Number of handover successes 100%/Number of handover requests

KPI Formula

V6.2C900060120/C900060119

Notes None

Counter Description

C900060119: Number of Intra-cell handover C900060120: Number of Intra-cell handover success

2.3.3 Handover Success Rate (Inter Cell)

KPI Handover success rate (Inter Cell)

KPI Definition

Formula: Number of inter cell handover successes 100%/Number of inter cell handover requests

KPI Formula

V6.2Formula 1:(C900060094 + C900060098)/(C900060093 + C900060097)

Notes None

Counter Description

C900060093: Number of BSC-controlled inter-cell outgoing handover C900060094: Number of BSC-controlled inter-cell outgoing handover success C900060097: Number of BSC-controlled inter-cell incoming handover C900060098: Number of BSC-controlled inter-cell incoming handover success

2.3.4 Handover Success Rate (Inter BSC)

KPI Handover success rate (Inter BSC)

KPI Definition

Formula :(default) Number of inter BSC handover successes 100%/Number of inter BSC handover requests

KPI Formula

V6.1 Formula 1:(C900060096 + C900060102)/(C900060095 + C900060099 + C900060100 + C900060101 + C900060216)



V6.2 The same as the above.

Notes None

Counter Description

C900060095: Number of MSC-controlled outgoing handover C900060096: Number of MSC-controlled outgoing handover success C900060099: Number of MSC-controlled incoming handover C900060100: Number of MSC-controlled incoming handover due to forced releaseC900060101: Number of MSC-controlled incoming handover due to queue C900060102: Number of MSC-controlled incoming handover success C900060216: Number of MSC-controlled incoming handover due to forced handover

2.3.5 Handover Due to Quality

KPI Handover due to quality

KPI Definition

Formula 1 (Handover Due to DL Quality): Handover requests due to DL quality 100%/Number of handover requests

Formula 2 (Handover Due to UL Quality): Handover requests due to UL quality 100%/Number of handover requests

KPI Formula

V6.2

Formula 1 (Handover Due to DL Quality): (C900060085 + C900060227)/(C900060093 + C900060095 + C900060119)

Formula 2 (Handover Due to UL Quality): (C900060084 + C900060226)/( C900060093 + C900060095 + C900060119)

NotesIf DL or UL is not considered, add the numerators without changing the denominator

Counter Description

C900060084: Number of TCH/F handover attempts due to UL quality C900060085: Number of TCH/F handover attempts due to DL quality C900060093: Number of BSC-controlled inter-cell outgoing handover C900060095: Number of MSC-controlled outgoing handover C900060119: Number of Intra-cell handover C900060226: Number of TCH/H handover attempts due to UL quality C900060227: Number of TCH/H handover attempts due to DL quality

2.4 Reliability

2.4.1 Call Drop Rate

KPI Call drop rate

KPI Number of TCH call drops 100%/Number of TCH seizures (excluding



Definition handover)

KPI Formula

V6.2(C900060054+C900060055)/(C900060028+C900060036+C900060199+C900060210)

Notes

Voice channel call drop rate falls into two types: one is with handover included; the other is with handover excluded. If handover is not included, the indicator value will be about 0.2% higher than the one with handover included. This discrepancy is not universally defined yet, for it can be larger in dual-band network. This KPI value differs a lot in varied types of network. The discrepancy can reach 0.3%.

Counter Description

C900060054 Number of TCH/F dropsC900060055 Number of TCH/H dropsC900060028 Number of voice TCH/F assignment successC900060036 Number of data TCH/F assignment successC900060199 Number of Voice TCH/H assignment successC900060210 Number of data TCH/H assignment success

2.4.2 UL RxQual 0-4

KPI UL RxQual 0-4

KPI Definition

UL RxQual 0-4 100/UL RxQual 0-7

KPI Formula

V6.1

(C900060066 + C900060067 + C900060068 + C900060069 + C900060070) 100/(C900060066 + C900060067 + C900060068 + C900060069 + C900060070 + C900060071 + C900060072 + C900060073)


Notes None

Counter Description

C900060066: Number of samples with UL RQ= 0 C900060067: Number of samples with UL RQ= 1 C900060068: Number of samples with UL RQ= 2 C900060069: Number of samples with UL RQ= 3 C900060070: Number of samples with UL RQ= 4 C900060071: Number of samples with UL RQ= 5 C900060072: Number of samples with UL RQ= 6 C900060073: Number of samples with UL RQ= 7

2.4.3 DL RxQual 0-4

KPI DL RxQual 0-4

KPI Definition

DL RxQual 0-4 100/DL RxQual 0-7

KPI Formula

V6.1

(C900060074 + C900060075 + C900060076 + C900060077 + C900060078) 900/(C900060074 + C900060075 + C900060076 + C900060077 + C900060078 + C900060079 + C900060080 + C900060081)


Notes None



Counter Description

C900060074: Number of samples with DL RQ= 0 C900060075: Number of samples with DL RQ= 1 C900060076: Number of samples with DL RQ= 2 C900060077: Number of samples with DL RQ= 3 C900060078: Number of samples with DL RQ= 4 C900060079: Number of samples with DL RQ= 5 C900060080: Number of samples with DL RQ= 6 C900060081: Number of samples with DL RQ= 7

2.4.4 UL RxQual 0-3

KPI UL RxQual 0-3

KPI Definition

UL RxQual 0-3 100/UL RxQual 0-7

KPI Formula

V6.1

(C900060066 + C900060067 + C900060068 + C900060069) 100/(C900060066 + C900060067 + C900060068 + C900060069 + C900060070 + C900060071 + C900060072 + C900060073)


Notes None

Counter Description

C900060066: Number of samples with UL RQ= 0 C900060067: Number of samples with UL RQ= 1 C900060068: Number of samples with UL RQ= 2 C900060069: Number of samples with UL RQ= 3 C900060070: Number of samples with UL RQ= 4 C900060071: Number of samples with UL RQ= 5 C900060072: Number of samples with UL RQ= 6 C900060073: Number of samples with UL RQ= 7

2.4.5 DL RxQual 0-3KPI DL RxQual 0-3

KPI Definition

DL RxQual 0-3 100/DL RxQual 0-7

KPI Formula

V6.1

(C900060074 + C900060075 + C900060076 + C900060077) 900/(C900060074 + C900060075 + C900060076 + C900060077 + C900060078 + C900060079 + C900060080 + C900060081)


Notes None

Counter Description

C900060074: Number of samples with DL RQ= 0 C900060075: Number of samples with DL RQ= 1 C900060076: Number of samples with DL RQ= 2 C900060077: Number of samples with DL RQ= 3 C900060078: Number of samples with DL RQ= 4 C900060079: Number of samples with DL RQ= 5



C900060080: Number of samples with DL RQ= 6 C900060081: Number of samples with DL RQ= 7

2.4.6 FER

KPI FER

KPI Definition

None

KPI Formula

V6.1


Notes None



3 CS Test KPIs

3.1 Accessibility

3.1.1 Call Setup Success Rate

KPI Call setup success rate

KPI Definition

Number of call connections 100%/Number of call attempts

Testing Method

For DT and CQT, the call attempt is determined by the simultaneous appearance of channel request and CM service request. When either of Connect and Connect Acknowledge appears after one call attempt begins, it is counted as one completion.

Notes It is generally required to be 98% by the operators.

3.2 Mobility

3.2.1 Handover Success Rate

KPI Handover success rate

KPI Definition

Number of handover successes 100%/Number of handover attempts

Testing Method

DT

Notes None

3.3 Reliability

3.3.1 CDR CMCC

CDR_CMCC drop/seizures*100 dropsC900060054+C900060055 (BSC counter)

seizures sysCallAnswer(MSC counter)

3.3.2 CDR_MOD



CDR_MOD

rflosses_mod/normseizs_mod*100

rflosses_mod

C900060054 + C900060055 + C901070021 + C901070042 +C901070019 +C901070040 + C901070018 + C901070039

normseizs_mod

C900060028 + C900060199 + C900060098 + C900060102 + C901050009 + C901050011

C900060054 Number of TCH/F drops

C900060055 Number of TCH/H drops

C901070021 Number of voice TCH/F drops due to other failure

C901070042 Number of voice TCH/H drops due to other failure

C901070019 Number of voice TCH/F drops due to forced release by other calls

C901070040 Number of voice TCH/H drops due to forced release by other calls

C901070018 Number of voice TCH/F drops due to OMC-R forced release

C901070039 Number of voice TCH/H drops due to OMC-R forced release

C900060028 Number of voice TCH/F assignment success

C900060199 Number of Voice TCH/H assignment success

C900060098 Number of BSC-controlled inter-cell incoming handover success

C900060102 Number of MSC-controlled incoming handover success

C901050009 Number of assignments success for voice channel due to queuing

C901050011 Number of assignments for execution for voice channel due to directed retry

3.3.3 Drop Call Rate

KPI Drop call rate

KPI Definition

Number of call drops 100%/Numbe of call completions

Testing Method

For DT and CQT, when either of Connect and Connect Acknowledge appears after one call attempt begins, it is counted as one completion. When either of Disconnect and Channel Release appears during one conversation, it is counted as one normal released. When none of the above stated two messages appears and the special mode is changed to idle mode, it is counted as one call drop. If the release occurs when the call duration does not meet the requirement, find the cause based on Layer 3 signaling decoding.

Notes None

3.3.4 SQI

KPI SQI



KPI Definition

TEMS test value

Testing Method

DT

Notes

This KPI is for inspecting the sound distortion degree resulted from incapable link transmission. The formula gained Ericsson’s patent. It takes into consideration many factors, including BER, FER, handover frequency, handover conditions, DTX activated (or not), and the encoder in use, to finally get the speech quality indicator (SQI). There are different SQI top limits for different types of encoders. For half-rate encoder, the SQI top limit is 19; for full-rate encoder, 21; for enhanced full-rate encoder, 30. SQI ranges from 18 to 30. SQI value will increase when EFR or AMR is applied.

3.3.5 Mean Opinion Score (MOS)

KPI Mean opinion score (MOS)

KPI Definition

It is related to testing equipment.

Testing Method

DT

Notes

The commonly used MOS assessment method consists of subjective and objective scoring parts. In the subjective part, engineers subjectively compare the original voice material and the deteriorated voice material according to ITU-T Proposal P.800 and P.830, and give their MOS scores respectively, then average the scores from different engineers. While in the objective part, PESQ method from ITU-T Proposal P.862 is used, that is special equipment or software (e.g. the VQT test equipment of Agilent) is used to perform the assessment. In MOS, 0 means the lowest quality, 5 stands for the highest. Standard PCM Quality should reach around 4.4. The MOS values for commonly used coding formats are as follows: G.711 – MOS = 4.8 G.721, G.723, G.726 – MOS = 4.2 G.728 – MOS = 4.2 G.729 – MOS = 4.2 G.723.1(5.3) – MOS = 3.5G.723.1(6.3) – MOS = 3.98 MOS can be affected greatly by the performance of test equipment. The test results from different vendors are different. Currently, the test equipment from Actena performs the best.

3.3.6 Rx Quality (0-3 and 0-4)

KPI Rx Quality

KPI Definition

Testing Method

DT



Notes None



4 CN CS KPIs

4.1 Paging Success RateKPI Paging success rate

KPI Definition

Number of paging responses 100%/Number of paging requests

Testing Method

See MSC counter indicators.

NotesBSC can indirectly provide this KPI, but its statistical point differs from that of MSC. The difference lies in call loss at Interface A.

Query Paging overflow: 1、How to query paging overflow in BSC Paging overflow is location in TRX paging Measure. There are two counter regarding paging discard.C901640001：Number of PS paging message discarded due to full of the queue

C901640002：Number of CS paging message discarded due to full of the queueAttention: It is not correct for M8206/BS20. It is correct for B8018/B8112/SDR. So please distinguish BTS type.

2、Regarding BTS paging capacity

If there is only one CCCH channel in the cell and AGCH block is two. Paging block is 7(9-2=7) in one 51 multiframe. Total PCH block are 26808. The max capacity of sending paging is 107232 under using TMSI on a quarter of one hour(Paging Type 3). But the number of paging is random. Paging type is shifty and paging type3 don't hold. In fact ,the max capacity can't achieve on Um interface. When bulk paging comes sometime, some paging message will be discarded because of paging queue. Remark: one multiframe is 235ms. Before we repeatedly calculate BTS capacity. BTS capacity is about 400000.it is correct. But peak value is not considered.

3、 the affecting for the BTS when TMSI&IMSI paging The paging type is 3 types

Type 1:Send 2paging message in one CCCH block(2 TMSI or 2 IMSI )。



Type 2:Send 3 paging message in one CCCH block ( 3 TMSI or 2TMSI+1IMSI)。

Type 3:Send 4 paging message in one CCCH block。(4 TMSI)

When using TMSI paging, MS maybe receive one type paging message of Type1 or Type2 or Type3. Paging message busy degree decide that BTS send which type paging message.BTS will send Type 3 message when paging message of is very busy. BTS send Type 2 message when it is not too busy. BTS send Type1 when it is not busy. When paging message is little or no paging message, Ms can receive Type 1 paging message. But message content maybe is null.

When BTS only send IMSI paging, BTS can't send Type 2 or Type 3 and only send Type 1 message. Every block have up 2 paging message. So TMSI paging capacity is double of IMSI paging capacity.BTS paging capability when extreme cases(4 TMSI or 2 IMSI in CCCH block )

Channeltype

PCH bl ock ofone mul t i f rame

Total PCHbl ock one hour

support maxAbi s pagi ngnumber(TMSI

pagi ng)

support maxAbi s pagi ngnumber(I MSI

pagi ng)

BCCH 8 122344 489376 244688In fact, paging message is not smooth. BTS sometime send TMSI and sometime send IMSI.Therefore, practical and effective sharing of CCCH blocks should be discounted. Lets assume that 50% of its. So the result is as follows.

Channeltype

Total PCHbl ock one hour

support maxAbi s pagi ngnumber(TMSI

pagi ng)

support maxAbi s pagi ngnumber(I MSI

pagi ng)

support max Abi spagi ng number(Fi rst l yTMSI , then I MSI pagi ng)

BCCH 61172 244688 122344 about 200000BTS will discard some paging message which can't be handled when bulk paging come. Because there are a variety of paging type of the mixed, so handling paging capability can't up to capacity.

4. BSC70 and 43 need to be splited LAC.



4.2 T305 & T308 Timers According to the Protocol, Channel Release message is sent from MSC. If MSC can send CLCMD message to force to disconnect link before T200 expiry (No response from MS to MSC), this call isn’t deemed as radio drop. This case only occurs after one Party ends the call normally.Two timers of MSC are related to above flow.1. T305: When MSC sends Disconnect Message, T305 starts. This message carries the cause of disconnection. T305 stops when MSC receives Release message from MS. If T305 expires, MSC sends Forced Release to MS.2. T308: After MSC sends Release Message, T308 starts. T308 stops when MSC receives Release Complete from MS. If T308 expires, MSC repeats Release and starts T308 again. If T308 expires twice, MSC sends Clear Command to BSC forcing to release radio resource.

4.3 Location Update Success RateKPI Location update success rate

KPI Definition

Number of location update successes 100%/Number of location update requests

Testing Method

See MSC counter indicators.

NotesBSC can indirectly provide this KPI, but the value is different. Its statistical point differs from that of MSC.


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