8/11/2019 GSM Call Drop Ratio Optimization Delivery Guide

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GSM Call Drop Ratio Optimization Delivery Guide

8/11/2019 GSM Call Drop Ratio Optimization Delivery Guide

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8/11/2019 GSM Call Drop Ratio Optimization Delivery Guide

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Contents

1 Overview........................................................................................................................................ 5

2 Definitions of Call Drop Ratio...................................................................................................... 5

2.1 Definition of BSC-level Call Drop Ratio................................................................................5

2.2 Definition of Cell-level Call Drop Ratio.................................................................................5

2.3 TCH Call Drop Ratio (%)(includin Handover).....................................................................5

2.! TCH Call Drop Ratio (%) ("#cludin Handover)...................................................................$

2.5 SDCCH Call Drop Ratio (%)................................................................................................. $3 ppli!ation Strate"ies of Call Drop Ratio...................................................................................#

3.1 TCH Call Drop Ratio and TCH Call Drop Ratio (e#cludin Handover).................................$

3.2 Difference of Definition Bet&een 'perator.......................................................................$

3.2.1 TCH Call Drop Ratio.................................................................................................. $

3.2.2 SDCCH Call Drop Ratio.............................................................................................

$ Strate"ies of Optimizin" Call Drop Ratio....................................................................................%

!.1 ind Trace of *nal+,in Call Drop role/......................................................................... 0

!.2 Hard&are ault.................................................................................................................1

!.3 Data Confiuration..............................................................................................................11!.! Coverae role/............................................................................................................ 11

!.5 nterference role/..........................................................................................................12

!.$ Call Drop Caued + Handover........................................................................................ 13

8/11/2019 GSM Call Drop Ratio Optimization Delivery Guide

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GSM Call Drop Ratio Optimization Delivery Guide

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1 Overview

Call drop ratio i an i/portant inde# for /eaurin 4ualit+ of &irele net&or and one of t6eindicator for appraiin t6e operator. T6i docu/ent e#pound everal definition of calldrop ratio7 difference et&een t6e definition7 calculation for/ula and it /eanin7 andpropoe t6e opti/i,ation trateie of decreain call drop ratio.

T6e narration of t6i docu/ent i aed on 8S BSC 93R2C13.

2 Definitions of Call Drop Ratio

2.1 Definition of &SC'level Call Drop Ratio

BSC-level call drop ratio i defined + uin t6e traffic /eaure/ent inde# in :BSC overallperfor/ance /eaure/ent; -< :acce perfor/ance /eaure/ent;. =B> in t6e for/ulaindicate inde# of BSC level.

(&1'a) *C+ !all drop ratio (,) (in!ludin" -andover)

Meanin"ercentae of TCH call drop to TCH occupation uccee.

/ormula 02 Count of call drop on TCH;? :1@ Count of uccee of occup+in TCH;A1%

ote T6i inde# i iven in t6e traffic /eaure/ent :BSC overall perfor/ance/eaure/ent; -< :acce perfor/ance /eaure/ent;.

2.2 Definition of Cell'level Call Drop Ratio

T6e call drop ratio of cell level i defined + uin t6e traffic /eaure/ent inde# in :cellperfor/ance /eaure/ent; -< :TCH perfor/ance /eaure/ent; or :cell perfor/ance/eaure/ent 2; -< :TCH?H perfor/ance /eaure/ent (2);. Cell-level calculation for/ula idirectl+ iven for t6e cell-level call drop ratio definition correpondin to t6e BSC-level inde#.=C> in t6e for/ula indicate inde# of cell level.

(C1'a) *C+ !all drop ratio (,)

Definition T6i inde# indicate t6e percentae of call drop on TCH c6annel to t6e totaluccee of occup+in TCH c6annel.

/ormula 021!2 Count of call drop on TCH;? :215 Count of (all) uccee of occup+inTCH;

ote T6i inde# i iven in t6e traffic /eaure/ent :cell perfor/ance /eaure/ent; -