54 GSM BSS Network Performance PS KPI (RTT Delay) Optimization Manual.doc

8/12/2019 54 GSM BSS Network Performance PS KPI (RTT Delay) Optimization Manual.doc

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GSM BSS Network PS KPI (RTT Delay) Optimization Manual INTERN !

Product Name Confidentiality Level

GSM BSS INTERN !

Product VersionTotal 31 pages

GSM BSS Network PS KPI (RTT Delay)

Optimization Manual

("or internal u#e only)

Prepared by GSM$%MTS NetworkPer&orman'e Re#ear'Department

Date**+,- , *

Reviewed by Date

Reviewed by Date

Granted by Date

.uawei Te' nolo/ie# 0o12 !t31

ll ri/ t# re#er4e3

**+,--,*- ll ri/ t# re#er4e3 Pa/e - o& -+


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Re4i#ion Re'or3

Date Version scription Author**+,- , * -1* Dra&t 'omplete3 Gen/ .ai5ian

**+,- , 6 -1* Re4i#e3 a''or3in/ to re4iew 'omment# Gen/ .ai5ian

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Contents

1 Overview......................................................................................7-1- De&inition1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

-1 Pin/ Pro'e## naly#i#1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

-18 Intro3u'tion to Delay in t e GPRS9EGPRS Sy#tem11111111111111111111111111111111111111111111111111111111111111111111111

2 Analysis and Optimi ation o! the R"" Delay..................................1#1- TB" E#ta;li# ment an3 Relea#e Delay Optimization1111111111111111111111111111111111111111111111111111111111111111111111

1 Data Tran#mi##ion Delay naly#i#111111111111111111111111111111111111111111111111111111111111111111111111111111111111

18 Sy#tem Pro'e##in/ Delay1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

1< Tran#mi##ion Delay ;etween Network Element#1111111111111111111111111111111111111111111111111111111111111111111111111

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$i%ures

Figure 1 E>e'ution re#ult o& t e Ping 'omman3111111111111111111111111111111111111111111111111111111111111111111111111111

Figure 2 0apturin/ Pin/ #er4i'e pa'ket#1111111111111111111111111111111111111111111111111111111111111111111111111111111111111

Figure 3 Pin/ &low w en t e TB" e#ta;li# ment or relea#e &low i# not optimize31111111111111111111111111111111111111111111111

Figure 4 Me##a/e tra'in/ at t e GB inter&a'e11111111111111111111111111111111111111111111111111111111111111111111111111111111

Figure 5 0ompari#on o& inter&a'e tra'kin/ (le&t2 'orre#pon3in/ to line < in "i/ure


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$%stract and $%%reviation

&eywords

Pin/2 RTT 3elay

Abstra't

Pin/ i# u#e3 to te#t t e RTT 3elay t at a&&e't# t e utilization rate o& ;an3wi3t 1 T i# 3o'ument3e#'ri;e# t e ;a#i' pro'e## o& t e Pin/ #er4i'e an3 t e met o3 &or re3u'in/ t e RTT 3elay1

A'ronyms and Abbreviations

A'ronym andAbbreviation

$ull (pellin%

GPRS General Pa'ket Ra3io Ser4i'e

EGPRS En an'e3 GPRS

MS Mo;ile Station

0?T 0all ?uality Te#t

DT Dri4e Te#t

RTT Roun3 Trip Time

I0MP Internet 0ontrol Me##a/e Proto'ol

P0% Pa'ket 0ontrol %nit

BSS Ba#e Station Sy#tem

BS0 Ba#e Station 0ontrol

BTS Ba#e Tran#'ei4er Station

TB" Temporary Blo'k "low

R!0 Ra3io !ink 0ontrol

M 0 Me3ia ''e## 0ontrol

M0S Mo3ulation an3 0o3in/ S' eme

Re&eren'e#

@-ATCP/IP Detail Volume 1 2 ;y 1Ri' ar3 Ste4en#2 in pril2 **+

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@ AGPRS Network Technology 2 prepare3 ;y Motorola En/ineerin/ In#titute2 on Cune -2 **6

@8AGSM PS Wirele Per!ormance "a eline #!iel$ %er ion& 2 prepare3 ;y t e GSM SolutionTe#tin/ Department2 on Septem;er 82 **+

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1 OverviewT i# 3o'ument 3e#'ri;e# t e role o& t e RTT 3elay2 ea' o''urren'e o& t e RTT 3elay in t eGPRS network2 an3 met o3# o& re3u'in/ t e RTT 3elay1

T e &ault i3enti&yin/ tool# in t i# 3o'ument mainly re&er to TEMS an3 Et ereal9 ire# ark1T e#e tool# 'an ;e u#e3 to tra'e or ;row#e t e in&ormation at t e NE #i3e1 To analyze t e RTT3elay2 you nee3 to 'olle't t e &ollowin/ 3ata #i/nalin/ tra'e3 ;y t e TEMS2 pa'ket# 'apture3

;y t e Et ereal9 ire# ark at t e MS #i3e2 #i/nalin/ tra'e3 on t e BSS PS %m inter&a'e2 an3#i/nalin/ tra'e3 on t e BSS PS G; PTP1

T e 3e#'ription in t i# 3o'ument i# ;a#e3 on t e 'on3ition t at no 3ownloa3 or uploa3 pro;lem e>i#t#1 In ot er wor3#2 no #u' &ault a# ' annel &ault2 link out o& #yn' ronization2 or pa'ket lo## on t e inter&a'e2 o''ur#1

1.1 De)nitionT e RTT 3elay re&er# to t e time elap#e3 &or a pa'ket to t e 3e#tination an3 ;a'k a/ain1 atimpa't 3oe# t e RTT 3elay a4e on t e #y#tem y 3o tele'om operator# nee3 to a##e## t eRTT 3elay

In t e 'a#e t at t e RTT 3elay i# lon/2 t e 'on&irmation o& t e 3ata at t e appli'ation layertake# a lon/ time1 T ere&ore2 at t e #low #tartup p a#e2 win3ow# are 3i#playe3 a&ter a lon/3elay2 an3 t e time to rea' t e 'on/e#tion t re# ol3 i# prolon/e3F at t e 'on/e#tion 'ontrol

p a#e2 t e in'rea#e in win3ow# #ize i# al#o #low1 In t i# 'a#e2 w en t e RTT 3elay i# lon/2 t e ;an3wi3t utilization rate i# low1

1.2 Pin% Pro'ess AnalysisT e RTT 3elay i# o&ten te#te3 t rou/ t e Ping 'omman31 T e Pin/ #er4i'e i# ;a#e3 on t eI0MP proto'ol1 T e 'lient #en3# an I0MP e' o re ue#t pa'ket to t e #er4er1 &ter re'ei4in/t e re ue#t2 t e #er4er en'ap#ulate# t e 3ata t at i# 'ontaine3 in t e re ue#t into an I0PMre#pon#e pa'ket an3 #en3# it ;a'k to t e 'lient1 T e &ollowin/ &i/ure # ow# t e re#ult o& t ePing 'omman3

**+,--,*- ll ri/ t# re#er4e3 Pa/e 7 o& -+


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Figure 1 E>e'ution re#ult o& t e Pin/ 'omman3

In t e Ping 'omman32 &n in3i'ate# t e num;er o& Pin/ time#2 an3 &l in3i'ate# t e #ize o& aPin/ pa'ket1 &ter t e Ping 'omman3 i# run2 t e RTT 3elay o& ea' Pin/ pa'ket will ;e3i#playe31 &ter t e e>e'ution o& t e Ping 'omman3 i# 'omplete2 t e minimum2 ma>imum2an3 a4era/e 3elay o& t e Pin/ pa'ket will ;e 3i#playe31 In t e in3ow# operatin/ #y#tem2 t etime pre'i#ion i# - m#1

"i/ure # ow# t e 3ata tra'e3 ;y t e ireS ark1

Figure 2 0apturin/ Pin/ #er4i'e pa'ket#

en t e 3e&ault #ettin/# o& t e in3ow# operatin/ #y#tem are u#e32 t e inter4al &or #en3in/two Pin/ re ue#t# i# - #e'on32 a# in3i'ate3 ;y t e inter4al ;etween t e two pa'ket# in "i/ure

1 I& t e 3elay o& t e Pin/ e' o re#pon#e pa'ket i# lar/er t an - #e'on32 t e ne>t Pin/ re ue#ti# #ent imme3iately a&ter t e e' o re#pon#e pa'ket i# re'ei4e31 In a33ition2 i& an e' o re#pon#e

pa'ket i# not re'ei4e3 wit in 6 #e'on3#2 a me##a/e in3i'atin/ re ue#t time out i# returne31T i# mean# t at t e peer i# not rea' a;le1 T e peer i# not 'ertainly unrea' a;le1 po##i;le'au#e i# t at t e peer network &irewall ;lo'k# Pin/ pa'ket#1

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1.* +ntrodu'tion to Delay in the GPR(,-GPR((ystem

Generally2 w en 'al'ulatin/ 3elay2 &a'tor# #u' a# t e network loa3 an3 ' an/e# ma3e in t einterme3iate network to 3ata pa'ket aut ority are not 'on#i3ere31 T e 3elay in t e GPRS orEGPRS #y#tem in'lu3e# t e #y#tem pro'e##in/ 3elay2 tran#mi##ion 3elay ;etween networkelement#2 3ata tran#&er 3elay2 an3 TB" e#ta;li# ment an3 relea#e 3elay1 T e #y#tem pro'e##in/3elay 3epen3# on t e ar3ware pro'e##in/ 'apa;ility o& t e #y#tem1 T e tran#mi##ion 3elay

;etween network element# i# relate3 to t e inter&a'e tran#mi##ion mo3e1 T e 3ata tran#&er3elay i# relate3 to t e #ize o& t e Pin/ pa'ket an3 t e en'o3in/ rate employe31 T e TB"e#ta;li# ment an3 relea#e 3elay i# relate3 to t e a''e## met o3 (&or e>ample2 one,p a#ea''e## or two,p a#e a''e##) an3 t e optimization met o3# relate3 to TB" e#ta;li# ment orrelea#e at t e network #i3e1

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I& t e 3elay o& only t e &ir#t Pin/ pa'ket i# lon/2 ' e'k w et er t e TB" e#ta;li# ment&low i# normal1

I& t e 3elay o& 'on#e'uti4e Pin/ pa'ket# i# lon/2 ' e'k w et er t e TB"e#ta;li# ment9relea#e optimization &low i# #tarte32 w et er t e parameter #ettin/# are

improper2 an3 w et er t e 3e&erre3 relea#e time# out 3ue to &ault# in 3ata tran#mi##ion1I& t e 3elay o& 'ertain pa'ket# amon/ t e 'on#e'uti4ely #ent Pin/ pa'ket# i# lon/2 ' e'k&a'tor# #u' a# t e en'o3in/ rate2 ' annel uantity2 an3 error ;lo'k# in 3ata tran#mi##ion1

Take t e Pin/ te#t # own in "i/ure - a# an e>ample1 T e 3ata tra'e3 on t e G; inter&a'e# ow# t at no lar/e 3elay i# in'urre3 in t e 'ore network1

Figure 1 Data tra'e3 on t e G; inter&a'e

T e 3elay o& t e &ir#t Pin/ pa'ket i# 7=7 m#2 a little lon/er t an t e u#ual 4alue1 # # own ;yt e #i/nalin/2 3ownlink pre,e#ta;li# ment i# not #tarte3 (Downlink pre,e#ta;li# ment # oul3

;e #tarte3 w en t e &ir#t %plink 0K me##a/e i# #ent1 T e 3ownlink pre,e#ta;li# ment i##tarte3 i& t e 3ownlink a##i/nment me##a/e i# #ent a&ter t e &ir#t %plink 0K me##a/e i##ent)F one uplink ' annel i# u#e3 an3 uplink an3 3ownlink en'o3in/ rate# are relati4ely low(t i# will ;e 3e#'ri;e3 in t e pro'e## o& t e #e'on3 Pin/ pa'ket)1

mon/ t e 'on#e'uti4e Pin/ pa'ket# t at are #ent2 t e 3elay o& 'ertain Pin/ pa'ket# i# lon/1Ba#e3 on t e pro'e## o& t e #e'on3 Pin/ pa'ket # own in "i/ure -2 you 'an lo'ate t e 3ata o&t i# Pin/ on t e G; inter&a'e1 "i/ure # ow# t e two 3ata ;lo'k# 'orre#pon3in/ to t e

pro'e## o& t e #e'on3 Pin/ pa'ket1

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Figure 2 0ompari#on ;etween t e 3ata tra'e3 on t e G; inter&a'e (on t e le&t #i3e2 'orre#pon3in/to line < in "i/ure - ) an3 t at tra'e3 ;y u#in/ t e Et ereal (on t e ri/ t #i3e)

I& no lon/ 3elay i# in'urre3 on t e G; inter&a'e2 t e 3elay i# mainly 'au#e3 ;y &a'tor# on t e%m inter&a'e1 I& a lot o& #er4i'e# are ;ein/ pro'e##e3 in t e e>i#tin/ network2 you mu#t lo'atet e 3ata o& t e MS an3 ' e'k t e &ir#t %plink 0K me##a/e t at i# u#e3 to #ettle t e 'on&li't2a# # own in "i/ure 81

Figure 3 %m inter&a'e a''e## &low (t e &ir#t %plink 0K me##a/e 'ontain# t e T!!I &or #ettlin/t e 'on&li't)

T i# i# one,p a#e a''e##1 "in3 t e la#t imme3iate a##i/nment me##a/e an3 you 'an #ee t att e uplink TF' in t e me##a/e i# 1( 1 "in3 t e ne>t 3ownlink a##i/nment me##a/e an3 you 'an#ee t at t e MS i# a33re##e3 ;a#e3 on uplink T"I -* an3 t at t e 3ownlink TF' o& t e MS i#131 !o'ate t e 3ata ;lo'k# tran#mitte3 on t e %m inter&a'e &rom t e G; inter&a'e1 Hou 'ani3enti&y t e #pe'i&i' 3ata ;lo'k# a''or3in/ to t e 'ontent# o& t e entire !!0 PD% on t e G;inter&a'e an3 t e 'ontent# o& t e R!0 3ata ;lo'k# on t e %m inter&a'e2 a# # own in "i/ure


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Figure 4 Data relate3 to t e #e'on3 Pin/ operation tra'e3 on t e %m inter&a'e

# # own in "i/ure


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I& many 3ownlink ;lo'k# are not re'ei4e3 ;y t e MS2 it i# pro;a;le t at t e tran#mi##ion linki# &aulty1

(tep 2 naly#i# # ow# t at t e &ault i# pro;a;ly 'au#e3 ;y t e link uality1 0 e'k w et er an alarmin3i'atin/ lo## o& #yn' ronization on t e link i# /enerate3 an3 w et er t e BTS 'lo'k i#

#yn' ronize3 wit t e BS0 'lo'k2 an3 ' e'k t e ;it error rate on t e G, ;i# inter&a'e1 In t ela;oratory en4ironment2 t e BTS 'lo'k i# 'on&irme3 to ;e in &ree,run #tate1 T e &ile atta' e3

pro4i3e# t e Pin/ operation relate3 3ata tra'e3 t e 'on&i/uration 3ata1 Ba#e3 on t e pre'e3in/analy#i#2 you 'an try to analyze t e lon/ 3elay in t e &ourt Pin/ operation1

2.1 " $ -stablishment and Release DelayOptimi ation

-1 %plink TB" e#ta;li# ment 3elay optimization

n uplink TB" 'an ;e e#ta;li# e3 un3er two #ituation# one,p a#e a''e## an3 two,p a#ea''e##1 In one,p a#e a''e##2 it take# a;out -:8 m# &rom t e #en3in/ o& a ' annel re ue#t to t ea##i/nment o& uplink re#our'e#1 In two,p a#e a''e##2 it take# a;out ten#ion &un'tion i# ena;le31 To ena;le t i# &un'tion2 ' oo#e ConfigureCell $ttri%utes , P * $ttri%utes P* Net+or0 ptimi ation Parameters 'nactive/elay of 67tended plin0 TF)8ms9 2 an3 #et 'nactive /elay of 67tended plin0 TF)8ms9 to a proper 4alue1 T e re'ommen3e3 4alue i# *** m#1

**+,--,*- ll ri/ t# re#er4e3 Pa/e -< o& -+


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T e uplink e>ten#ion &un'tion # oul3 ;e #upporte3 ;y t e MS1

# t e inter4al &or two Pin/ pa'ket# i# - #e'on32 'nactive /elay of 67tended plin0 TF)8ms9 # oul3 ;e #et to a 4alue t at i# lar/er t an - #e'on31

81 Downlink TB" e#ta;li# ment 3elay optimization

Normally2 t e 3ownlink TB" e#ta;li# ment #tart# w en t e 3ownlink 3ata rea' e# t e P0%1But &or 'ommon PS #er4i'e#2 t e uplink TB" i# e#ta;li# e3 &ir#t2 an3 3ownlink 3ata i#a4aila;le1 T ere&ore2 t e pro3u't pro4i3e# t e 3ownlink pre,e#ta;li# ment &un'tion1 Hou 'anena;le t i# &un'tion ;y enterin/ #uper u#er mo3e2 ' oo#in/ Configure )*C $ttri%utes ,*oft+are Parameters , *upport advance do+nlin0 T)F esta%lis.ment 2 an3 #ettin/*upport advance do+nlin0 T)F esta%lis.ment to ptimi e +it. $LL TLL' 1 In t i# 'a#e2a&ter t e uplink TB" i# e#ta;li# e32 t e e#ta;li# ment o& t e 3ownlink TB" i# imme3iatelytri//ere31


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Figure 2 Payloa3 o& !!0 layer 3ata in t e R!0 3ata ;lo'k# in 3i&&erent en'o3in/ rate# in EGPRS

Channel Codin%('heme

-GPR( R/C Data 0nit (i e 23o'tets3

$amily

M0S,- 0M0S, + B

M0S,8 87

M0S,< 6= B

M0S,+ >=+

M0S,: >7

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54 GSM BSS Network Performance PS KPI (RTT Delay) Optimization Manual.doc