Thoả thuận dịch vụ SLA trong mạng di động 3G

7/29/2019 Tho thun dch v SLA trong mng di ng 3G

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TP ON BU CHNH VIN THNG VIT NAM

HC VIN CNG NGH BU CHNH VIN THNG

Mnh Hng

Nghin cu c ch tho thun dch v SLA trong mng ding 3G, xut ng dng trn mng ca VNPT

Tm tt LV ThS k thut : K thut in tM ngnh 60 52 70

Ngi hng dn PGS. TS Hong Minh

H NI-2010


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M UCc mng di ng th h 3 ang c trin khai mnh m ti Vit

Nam. Vic cung cp dch v gn lin vi cc cam kt v cht

lng (SLA) s em n li th cnh tranh ln cho nh khai cung

cp dch v.

Tuy nhin vic thc hin cc bin php k thut nhm m bo

cht lng cho cc dch v khc nhau, cc khch hng khc nhau

theo ng cc cam kt a ra l rt phc tp.i vi cc nh cungcp dch v, vn t ra l: Cam kt ci g? Lm th no thc

thi cc cam kt ? Trong cam kt v cht lng dch v v cc

bin php k thut m bo dch v c a n khch h ng

vi cht lng ng theo nhng g cam kt l n dung c bn

nht.

Lun vn ny nghin cu v SLA trong mng 3G v xut p

dng SLA trn mng ca VNPT. Mc ch ca lun vn l nghincu cc tham s cht lng no cn a vo SLA; cc bin php

k thut no cn thit m bo cc cam kt cht lng trong

mng 3G. gii qut vn , ni dung ca lun vn gm bn

chng.


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[32] . Performance Reporting - Concept and Definitions.TM701.

3

Chng 1: Gii thiu tng quan v SLA, cc vn v

qun l gim st SLA. Chng ny cng a ra phng php lun

cho vic xc nh cc tham s cht lng cn a ra trong SLA.

Chng 2: Nghin cu v phn tch c ch m bo QoS

thc thi SLA trong mng 3G; a ra cc tham s QoS c trng

cho mng v dch v trong 3G.

Chng 3: Lun vn gm cc ni dung v kho st hin

trng v xu hng pht trin ca cc mng 3G ca VNPT; phn

tch v nh gi nng lc ca cc mng trong vic thc th i SLA.

T lun vn a ra cc khuyn ngh cho cc mng 3G ca

VNPT v cc tham s cht lng nn a vo SLA v khuyn

ngh v m hnh kin trc mng nhm trin khai SLA.

Chng 4: Kt lun


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CHNG 1: C CH THA THUN SLA

Trong chng ny, lun vn gii thiu tng quan v SLA, cc vn

v qun l gim st SLA. Chng ny cng a ra phng

php lun cho vic xc nh cc tham s cht lng cn a ra

trong SLA.

1.1Tng quan1.1.1 Cc khi nim v nh nghaService Level Agreement: L mt tha thun chnh thc gia hai

hay nhiu bn t c sau qu trnhm phn vcc c tnh ca

dch v, v quyn hn v trch nhim ca mi bn. [1]

SLA c th bao gm cc iu khon v hiu nng, tnh cc,

phng thc cung cp dch v, SLA cng c th bao gm cc iukhon v kinh t v php lut.

Cc iu khon ca SLA lin quan n cht lng dch v(QoS)

c gi ltha thun QoS bao gm cc tha thun gia hai bn

vgim st, o kim v xc nh cc tham s QoS. Mc ch l

t c sng ca khch hng v QoS t h hi lng vi

cht lng dch v m h nhn c.

41

[18] ETSI.ETR 003 Network Aspects (NA); General aspects of Quality ofService (QoS) and Network Performance (NP).

[19]TMForum.Business Process Framework. s.l. : Release 8.0, June, 2009.GB921.

[20] ITU-T. Perceptual evaluation of speech quality (PESQ), an objectivemethod for end-to-end speech quality assessment of narrowband telephonenetworks and speech codecs. February 2001. P.862.

[21] . Single-ended method for objective speech quality assessment innarrow-band telephony applications.May 2004. P.563.

[22] . Conformance testing for narrowband voice over IP transmissionquality assessment models.June 2006. P.564 .

[23] .The E-model, a computational model for use in transmission planning.March 2005. G.107.

[24] . Objective perceptual multimedia video quality measurement in thepresence of a full reference.08/2008. J.247.

[25] . Perceptual Evaluation of Speech Quality (PESQ) An Objective Methodfor End-to-End Speech Quality Assessment of Narrowband TelephoneNetworks and Speech Codecs.02/2002. P.862 PESQ.

[26]TM Forum.SLA Management HandBook - Excutive Overview. uly 2004.Vol. 1. GB917.

[27] . SLA Management HandBook - Service and Technology Examples. an

2007. Vol. 3. GB917.[28] . SLA Management HandBook - Enterprise Perspectives. Oct 2004. Vol.

4. GB917.

[29] . Wireless Service Meansurements Handbook.March 2004. GB923.

[30] . Video Over I P - Application Note to SLA Management Handbook. une2009. GB938.

[31] . VoIP Application Note to SLA Management Handbook. une, 2009.GB934.


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[2] ITU-T E800.Terms and Definitions Related to Quality of Service andNetwork Performance Including Dependability.

[3] V. Paxson, G. Almes, J . Mahdavi, M. Mathis. Framework for I PPerformance Metrics. May 1998. RFC 2330,.

[4] G. Almes, S. Kalidindi, M. Zekauskas,.A One-way Delay Metric forIPPM. September 1999. RFC 2679.

[5] G. Almes, S. Kalidindi, M. Zekauskas.A Round-trip Delay Metric forIPPM. September 1999. RFC 2681.

[6] . Martin, A. Nilsson,.On service level agreements for IP networks. s.l. :INFOCOM 2002. Twenty-First Annual Joint Conference of the IEEEComputer and Communications Societies. Proceedings. IEEE , Volume: 2 ,23-27 June 2002, Pages:855 - 863 vol.2.

[7] TM Forum.SLA Management HandBook - Concepts and Principles. uly2005. Vol. 2. GB917.

[8] D. Durham, Ed., J . Boyle et al.The COPS (Common Open PolicyService) Protocol.Jan 2000. RFC 2748 .

[9] T.M.T. Nguyen, N. Boukhatem, Y. El Mghazli, N. Charton, L .N.Hamer, G. Pujolle.COPS-PR Usage for SLS Negotiation (COPS-SLS).July 2002.

[10] 3GPP.Circuit Teleservices supported by a Public Land Mobile Network(PLMN).TS 22.003.

[11] . Circuit switched multimedia telephony.TR 23.972.[12] . Quality of Service (QoS) concept and architecture.TS 23.107.

[13] IETF.COPS Usage for Policy Provisioning (COPS-PR). RFC 3084.

[14] 3GPP.End-to-end Quality of Service (QoS) signalling flows.TS 29.208.

[15] An Expedited Forwarding PHB (Per-Hop Behavior).RFC 3246.

[16] Assured Forwarding PHB Group. RFC 2597.

[17] ITU-T.End-User Multimedia QoS Categories . Nov 1, 2001. G.1010.

5

Customer ProviderService Level Agreement

Service DescriptionQoS Agreement

Legal IssuesBilling..

Hnh 1-1 Service Level Agreement

Nh vy c th thy. ni dung c bn ca SLA chnh l nhng

cam kt v cht lng dch v, cc bin php m bo cht lng

dch v m nh cung cp dch v mang n cho khch hng.

1.1.2 Cc thnh phn c bn ca SLACu trc chung ca SLA c th hin Hnh 1-2:

E.860_F5-1

ServiceL evel Agreement

Introduction

Scope

Confidentiality

Legal Status

Periodic ProcessReview

Signatories

QoS A greement 1 QoS Agreement N........

QoS Agreement 1

BI

TI

Traffic Patterns

QoS Parameters and Objectives

Measurement Schemes

Reaction Patterns

InterfaceDescription

QoS Agreement N

BI

TI

Traffic Patterns

QoS Parametersand Objectives

Measurement Schemes

ReactionPatterns

InterfaceDescription

Hnh 1-2 Cu trc chung ca mt SLA


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Nh c th hin trn Hnh 1-2, mt SLA tng ng vi tt c

cc dch v gia hai bn (SLA trong mi trng nhiu nh cung

cp dch v), n bao gm mt phn chung v cc phn ring cho

tng dch v.

Ni dung quan trng nht trong SLA l cc tha thun v QoS, V

l i tng ch yu m lun vn ny cp n..

1.2Cc tham s v cht lng dch v trong SLA1.2.1 KQI v KPICc nh cung cp dch v thng c cc kim tra, bo co v hiu

nng mng li ca h da trn cc ch s hiu nng KPI(Key

Performance Indicators). Cc KPI vn l cc tham s cho h tng

mng v khng cung cp c ci nhn v cht lng dch v t

u cui ti u cui m mng h tr. Tuy nhin cc tham s ny

l thc o quan trng cho hot ng ca mng

hng n vic qun l cht lng dch v, cn cc ch s cht

lng KQI(Key Quality Indicators). Cc ch s KQI nhm hng

ti thc o hiu nng ca dch v hn l cc tham s ca h tng

mng li.

ngha ca KQI l cung cp mt h thng cc tham s cho vic

gim st, o kim cht lng dch v cung cp n khch hng.

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Lun vn i vo nghin cu cc vn lin quann vic thc

thi SLA cho cc dch v trong mng di ng 3G. Ni dung c bn

ca lun vn l a ra phng php lun xc nh cc tham s

cht lng trong SLA, a ra cc tham s cht lng cho cc dch

v t rn mng di ng 3G v cc khuyn ngh p dng cho mng

ca VNPT. Lun vn cng a ra khuyn ngh v kin trc

CUE (Cadenus UMTS extension) cho vic trin khai SLA trong

mng 3G ca VPT.

Bn cnh lun vn cng tng kt li kin trc v cc c ch

QoS trong mng 3G do 3GPP, phn tch cc im m 3GPP cha

a ra v xut m hnh nh x QoS gia min UMTS v min

IETF diffserv.

Hc vin c gng trnh by mt cch c h thng, a ra cc

phn tch v nhn nh ca mnh. Tuy nhin, v thi gian c hn,

SLA l lnh vc nghin cu cn mi v rng ln, nn c nhiu vn

m lun vn ch cp m cha i vo phn tch mt cch y

c, v cng c th c nhiu thiu st trong cc vn m

lun vn cp ti. Hc vin rt mong c cc thy c v ng

nghip gp hon thin trong cc nghin cu tip theo.

TI L IU THAM KHO

[1] ITU-T E.860.Framework of a service level agreement.6/2002.


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3.3Kt chngDa trn cc phn tch v nng lc ca cc mng 3G ca VNPT,chng ny a ra cc khuyn ngh v cc tham s KPI; KQI

cn thit vi cc dch v VoIP v video telephone. y l cc dch

v c bn v c trng trong mng 3G. c bit chng ny cng

a ra khuyn ngh p dng m hnh CADENUS m rng cho

UMTS p dng cho mng 3G ca VNPT. M hnh ny va p

ng c nhu cu trin khai SLA m khng nh hng n vic

m rng, pht trin ca mng 3G ca VNPT theo hng nng cp

ln cc Release tip theo ca 3GPP.

CHNG IV: KT LUN

SLA ngy cng c cp v nghin cu rng ri. S lng cc

nghin cu lin quan n SLA ngy cng nhiu. Cc nh cung cp

thit b v gii php vang tip tc a ra cc sn phm theo

hng tch hp cc tnh nng phc v cho thc thi, gim st SLA.Th trng kinh doanh cc dch v vin thng ngy cng cnh

tranh khc lit, nhiu nh khai thc mng v cung cp dch v

cng a ra SLA cho cc dch v m h cung cp. V vy vic

nghin cu SLA v p dng cho cc dch v vin thng ti Vit

Nam l cn thit v c ngha thc tin cao.

7

Cc KQI thng l mt phn ca cam kt SLA. Hnh 1-3 cho ta

ci nhn ton cnh v cc ch s cht lng v ch s hiu nng.

Service Resources(Grouped by Type)

KPIs AdditionalData

Service

KQIsAdditional

Data

Product

KQIsAdditional

Data

Customer SLAs

Internal & Supplier/Partner SLAs

Network

Focus

CustomerFocus

Service E lements

Product Components

Service ResourceInstances e.g.Network Element

PerformanceRelated Data

Hnh 1-3 KQI v KPI .

1.2.2 Phng php xc nh cc KQIPhn ny cung cp ci nhn tng quan v phng php xc nh

cc tham s v cht lng dch v m ngi dng c th cm nhn

c t xc nh cc KQI cn thit trong SLA. Vi phng

php tip cn t trn xung gn vi qu trnh phn phi dch v

kt hp vi phng php tip cn t di ln xc nh cc cc


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trao i cn thit cung cp dch v. T nhn bit c

nhng nh x gia tham s dch v v tham s mng li, v

quyt nh cc tham s lin quan n mng li v tham s khng

lin quan n mng li no cn thit xy dng nn cc KQI

cho dch v.

ServiceScenarios

AnalyseTimeline

Identify ServiceTopology

Develop Matrix

IdentifyMeasurements

Develop KQIs

3GPP SA5KQIs

Step 1

Step 2

Step 3

Step 4

Steps 5 & 6

Hnh 1-4Phng php xc nh KQI.

Phng php xc nh cc KQI c m t nh Hnh 1-4. T

tng ca phng php l xut pht t cc vn kinh doanh ca

dch v, phn tch v a ra cc tham s KQI cn thit cho dch

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trong mng v hng ti iu khin QoS cho local, trong khi kin

trc CUE hng c th iu khin E2E v lin min. Vic iu

khin QoS trong mt phng iu khin bt buc phi gn vi

GGSN, nhng CUE-RM c th iu khin QoS trong mt phng

ngi dng qua Router bin( xem Hnh 3-2).

Mt ni dung quan trng ca CUE-RM trong vic hng ti iu

khin QoS lin mng l phi c chc nng nh x gia QoS gia

cc min c cc c ch QoS khc nhau. V d trong trng hp

cho mng UMTS, CUE-RM phi nh x gia UMTS v IETF

diffserv, khi c ch nh x m lun vn ny khuyn ngh l c

ch c trnh by trong Phn 2.1.3.

3.2.3 Khuyn ngh v l trnh trin khai SLA cho mng ding 3G ca VNPT

trin khai c SLA, ngoi c c s h tng k thut mng

m bo c cc yu cu v thc thi gim st, cn c yu t khc

nh: cn c cc quay trnh v iu hnh sn xut kinh doanh saocho quan h vi khch hng, cng nh cc yu t v chm sc

khch hng. c th trin khai thnh cng SLA VNPT cn thc

hin theo cc bc.


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ny, SLA cho dch v ca ngi dng c th c iu khin linh

hot trong UMTS: thay i theo phin (vi pha to PDP context),

hoc ngay trong phin (vi pha thay i PDP context). Tuy nhin

cc c ch SLA tnh vn c th p dng. Trong kin trc ny cc

thng tin v SLA phi c cp nht trong QoS profile ca ngi

dng ti HLR/VLR ca mng UMTS. Khi thng tin v ngi d ng

c cp nht th CUE-SM s cp nht v chuyn i cc thnh

cc SLS trao i vi CUE-RM. CUE-RM s s dng cc SLS

cu hnh GGSN.

Hnh 3-2 Kin trc CADENUS m rng cho UMTS.

C ch giao tip gia CUE-RM v SGSN ging nh c ch iu

khin QoS gia PDF v SGSN c trnh by trong Phn

2.1.2.3 (trang 17). S khc nhau y l PDF l thnh phn nm

9

v, cng nh xc nh cc yu cu cho vic o kim v h thng

cc tham s tnh ton.Cc bc c th l:

1.2.2.1Phn tch kch bn ca dch v1.2.2.2Phn tch chu k sng ca dch v1.2.2.3Phn tch topo ca dch v1.2.2.4Xy dng ma trn tng tc1.2.2.5a ra cc KQI1.2.2.6Xc nh nhng o kim cn thit1.2.3 Phn loi cc tham s cht lngPhn ny trnh by phng thc phn loi cc tham s cht lng

KQI. Nh phn tch trn, cc tham s KQI i vi cc dch

v khc nhau l khc nhau v cc i tng khch hng khc nhau

li quan tm n cc tham s KQI khc nhau. Vic phn loi tham

s gip cho vic xc nh cc tham s cn thit a vo SLA cng

nh xc nh phng php xc nh gi tr ca cc tham s .

Cc KQI c phn loi nh Bng 1-1. Cc tham s c phn

loi da trn cc c tnh ca dch v, c tnh cng ngh h tr


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dch v , v da trn cc gi tr o kim cc tham s(cho tng

ngi dng hay gi tr trung bnh mang tnh thng k).

Service Parameter CategoriesTechnology

SpecificServiceSpecific

Technology/Service Independent

Service

View

Individual UserView

ParameterList 1

ParameterList 2

ParameterList 3

Aggregate View

ParameterList 4

ParameterList 5

ParameterList 6

Bng 1-1 Phn loi cc tham s KPI.

1.3Qun l, gim st SLABn cnh vic xc nh cc tham s SLA lm c s cho nh

cung cp cam kt vi khch hng, cc nghin cu v SLA cn

c thc hin trn cc lnh vc khc l:

Qun l SLA

Gim st v o kim

Phng thc iu khin QoSPhn ny ca lun vn i vo kho st tnh hnh cc nghin cu v

SLA trn cc kha cnh nu trn

1.4Kt chngNi dung ca chng a ra nh ngha v gii hn nghin cu

v SLA ca lun vn l cc tham s cht lng dch v trong SLA

35

truy nhp AM (access mediator); iu phi dch v SM (service

mediator); v iu phi ti nguyn RM (resource mediator). Chc

nng ca cc thnh phn ny th hin trong Hnh 3-1.

Hnh 3-1 Kin trc CADENUS.

Da trn kin trc CADENUS, m hnh m lun vn khuyn ngh

dng cho mng 3G ca VNPT nh th hin trong Hnh 3-2.c trng c bn ca m hnh CADENUS m rng cho UMTS

(vit tt l CUE: CADENUS UMTS extension) l: thm vo 2

thc th iu phi dch v CUE-SM v iu phi ti nguyn CUE-

RM. Chc nng iu phi truy nhp khng c a ra v trong

UMTS, c ch yu cu dch v da trn PDP context thc hin

c cc mong mun v yu cu dch v ca AM. Vi kin trc


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3.2.1 Khuyn ngh v cc tham s KQI trong SLADo thi gian c hn, phn ny ch a ra cc khuyn ngh v cc

tham s KQI cho dch v VoiP v IPTV. y l hai dch v c bn

v c trng trn mng 3G so vi dch v trn mng 2G. Ni dung

cc khuyn ngh v cc tham s KQI cho cc dch v c th

hin trong cc mc:

3.2.1.1Dch v VoIP3.2.1.2Vi dch v Video-telephony:.3.2.2 Khuyn ngh v m hnh thc thi SLA cho mng ca

VNPT.

Nh phn tch trong phn 3.1. Cc mng 3G ca VNPT hin

ti c trin khaitheo R4, nn cha c thnh phn PDF cho vic

iu khin QoS. Phn ny ca lun vn khuyn ngh v m hnh

trin khai SLA cho 3G ca VNPT.

M hnh c khuyn ngh y dc a ra da trn m hnh

CADENUS: (Creation and Deployment of End-User Services in

Premium IP Network) c s thay i ph hp cho mng 3G ca

VNPT.

CADENUS: l mt project hng ti iu khin end-to-end QoS

da trn SLA. Kin trc ny gm 3 thnh phn chnh l iu phi

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v cc c ch thc thi cc cam kt trong mng 3G. Phn 1.2 trnh

by phng php lun cho vic xc nh cc tham s cht lng

cn thit c a ra trong SLA da trn ma trn tng tc. Vi

vic s dng ma trn tng tc, ta c th xc nh c cc tham

s SLA cho cc dch v m ngi s dng c th hiu v cm

nhn c cng nh cho ta phng php xc nh, tnh ton cc

tham s . Phn 1.3 tng kt cc lnh vc nghin cu v qun l

v gim st SLA trong vin thng. Chng ny cng tm tt

kt qu kho st v cc hng nghin cu v SLA ang c thc

hin, trong c cp n cc hng nghin cu mi nh l h

thng tham s da trn Web Response Time Metric, cc giao thc

m phn QoS mi nh COPS-SLS (mc 1.3) .v.v.

CHNG II: NG DNG SLA TRONG MNG

DI NG 3G

Ni dung chng 2 tp trung vo hai ni dung chnh l: nghincu v cc tham s cht lng dch v cho cc dch v trn 3G v

cc phng thc nhm m bo cht lng dch v trong mng

3G. Phn u ca chng s i vo nghin cu kin trc QoS;

tng hp cc c ch m bo QoS trong 3G theo cc chun ca

3GPP. y l c s phn tch v a ra cc phng php m

bo thc thi cc cam kt v cht lng dch v trong SLA. Vic


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tng hp cc c ch QoS theo cc Release ca 3GPP nhm mc

ch lm c s phn tch nng lc thc thi SLA cho cc mng 3G

ca VNPT chng 3. Phn 2.2 v 2.3phn tch, a ra cc tham

s KQI; KPI cho mng v dch v trong 3G. Phn 2.4 cp n

cc vn n c bn v qun l, gim st SLA trong 3G.

2.1 K in trc QoS trn mng di ng 3G-UMTS2.1.1 Kin trc mng di ng 3G-UMTS

Hnh 2-1 Kin trc mng UMTS theo 3GPP R5

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Hin nay, cc thit b Node B/RNC ca cc hng u h tr,

cho php cu hnh truyn ti cc dch v thoi v data trn

mt lung FE (khng cn s dng thm lung E1). Nu cu

hnh nyc trin khai v m bo c cht lng s gim

thiu rt nhiu chi ph truyn dn SDH trin khai cho mng

3G.

Xu hng pht trin ca cc mng 3G ca VNPT:

Tuy c s khc nhau v tin v cch thc v m hnh trin khai

theo a l, nhng xt v kin trc h cng ngh thng mng 3G

th c hai mng Vinaphone v MobiFone c cng phng thc

tin ha l: xy dng mng 3G theo R4 v tng bc chuyn sang

R5 vi vic a vo phn h iu khin IMS.

Nh vy xt v phng din QoS cc phng thc m bo QoS

cng ph thuc vo kin trc mng tin ha t R4 ln R5 (kin

trc QoS theo cc release ca 3GPP c phn tch trong Phn

2.1.2). Hin ti cc mng u trin khai theo R4 nn cha c cc

c ch iu khin QoS ca IMS.

3.2 Cc khuyn ngh p dng SLA cho mng di ng 3Gca VNPT

Qua qu trnh nghin cu, phn ny ca lun vn a ra mt s

khuyn ngh, gii php p dng cho mng ca VNPT


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oi vi mng MobiFone, i vi vng c cng sng

3G mnh hn 2G, thu bao s t chuyn sang ch s

dng sng 3G (khng cn ng k). Phng n ny share

ti ng k cho mng 2G do cc thu bao hin nay ch

yu vn s dng ch 2G.

oi vi mng VinaPhone: Do dung lng Softswitch cha

p ng cho cc thu bao trn mng nn phn ln lu

lng cho 2G vn nh tuyn qua cc tng i TDM v

cc thu bao phi ng k dch v mi c th s dng

c sng 3G. Do vy, mc share ti gia 3G v 2G

cn thp.

Hin trng cu trc truyn dn cho mng thng tin di ng:

Phn v tuyn: i vi cc trm BTS 2G thng s dng t

1-2E1. i vi cc trm BTS 3G (Node B), cu hnh truyn

dn s dng ph bin hin nay l 1E1 cho thoi v 3E1 hoc

1FE cho cc dch v data.

Phn mng li: Trong qu trnh trin khai 3G, cc h thng

tng i Softswitch ang dn thay th cc h thng chuyn

mch TDM c phc v chung cc thu bao 2G v 3G.

Cng vi vic softswitch ho phn chuyn mch, truyn dn

cho phn mng li ang dn c IP ho v chuyn qua mng

IP core.

13

2.1.2 S pht trin ca kin trc QoS trong mng di ng 3G 2.1.2.1Cc c ch QoS trong cc mng trc 3GC ch m bo QoS trong GPRS ch yu da trn ng cnh

PDP: PDP Context (Packet Data Protocol). Cc ng cnh PDP

c thit lp gia UE v GGSN to ra lin kt logic gia UE v

CN. N cha cc thng tin v phin lin lc ca UE mi khi UE

thit lp phin.

Hnh 2-2 th hin phng thc thit lp PDP context bao gm cc

bc:

Hnh 2-2 Th tc thit lp PDP context theo R97/98


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PDP context s dng trong GPRS theo R97/98 c gi l

Primary PDP context. Trong R97/98 a ra cc QoS profile nh

sau:

Precedence class:.

Reliability class:

Throughput class:

Nh th hin trn Hnh 2-2 ta thy, trong GPRS, BSS khng tham

gia vo qu trnh thit lp PDP context. V th c ch QoS da

trn thng tin PDP context s ch c thc thi cho d liu truyntrn mng CN.

2.1.2.2Cc c ch QoS trong Release 99R99 l release u tin cho 3G. N cha cc nh ngha c bn

nht cho 3G UMTS. R99 a ra kin trc QoS t u cui n u

cui. Kin trc ny bao hm ton b qu trnh truyn d liu t

u cui ngi dng UE qua mng truy nhp v tuyn RNS/BSS,qua mng li chuyn mch gi PS CN n cc mng ngoi. R99

mi ch a ra cc quy nh v QoS gia UE RAN/BSS cc

node ca PS CN. Cc giao din gia MT TE v giao din vi

cc mng ngoi khng c quy nh trong R99 v s c b

xung trong R5 (Xem phn 2.1.2.3).

31

H ni 5 6 1HCM 10 15 1

Hi Phng 2 2 1 Nng 5 6 1C n th 5 6 1G 2011-2012H ni 9 14 1HCM 10 15 1Hi Phng 3 3 1 Nng 5 6 1Cn th 5 6 1

3.1.3 nh gi chung v nng lc cc mng 3G ca VNPTi vi mng li:

Qua s liu trn, thc t trin khai 3G trn mng VinaPhone

hin nay ang gp mt s kh khn do thiu v dung lng

chuyn mch v t l softswitch ho cn thp, khng p ng

cho s thu bao 2G hin ti. y cng l nguyn nhnnh

hng n cht lng mng VinaPhone do t l rt cuc cao

khi cc thu bao khi handover gia ch 2G v 3G i hi

phi chuyn quyn iu khin gia tng i TDM v

Softswitch.

Vic thiu dung lng Softswitch trn mng VinaPhone cng

l yu t nh hng ti cng tc trin khai 3G ca 2 mng di

ng khc khc nhau:


15/22

30

3.1.2 Mng MobiFoneHin trng mng MobiFone tnh n cui nm 2009:

Tham s S lngThu bao S lng thu bao

-Thu bao tr sau

- Card

34,729,2331,090,516

33,638,717

Mng truynhp v tuyn2G (BSS)

S lng BTS 11263S lng BSC 217

Mng truynhp v tuyn

3G (RNS)

S lng Node-B 2587S lng RNC 19

H th ng Softswitch

Mng Mobifone c: 39 t ng i (t ng dunglng l 36.600K), t l Softswitch chimkhong 68%;

H thngGPRS

H thng GPRS vi tng thng lng1.200Mbps (dung lng 8.000K phn SGSN,8.000K phn GGSN);

Cc h th ng khc

Dung lng h th ng IN l 54.798K; Dunglng h thng SMSC l 23.900K; H thngHLR vi tng dung lng l 63.000K.

Hng pht trin ca mng 3G MobiFone l: cng bc u aMSC-Server (softswitch) dn thay th cc tng i da trn TDM

v IP ha mng truyn dn, ng thi l bc m trin khai

IMS.

D kin trin khai cc nt mng Mobile NGN ca MobiFone:

MSC-Server MGW SGWG 2009-2011

15

R99 a ra cc phn lp QoS. Cc phn lp ny da trn cc c

tnh lu lng ca cc ng dng. Cc lp QoS bao gm:

Conversation class:

Streaming class:

Interactive class:

Background class:

Giao din Iu trong phn mng truy nhp v tuyn s dng c ch

ginh trc knh mang truy nhp v tuyn(RAB reservation:

Radio Access Bearer reservation). Giao din Gb c ci tin bao

gm: EGPRS v c ch PFC(Packet flow Context). Vi cc ci

tin ny, mng truy nhp v tuyn RAN h tr c cc ng

dng Realtime( cc ng dng thuc lp conversation v lp

streaming). Tuy nhin vic chun ha giao din Gb cho cc ng

dng thuc lp conversation ch kt thc R7.

R99 cng a ra phin bn mi ca PDP context l: Second PDP

context.

Kin trc E2E QoS


16/22

16

Hnh 2-3 Kin trc E2E QoS

Cc chc nng qun l QoS cho cc dch v truyn ti mng

UMTS trn mt phng iu khin:

Hnh 2-4 Cc chc nng qun l QoS vi cc dch v truyn ti UMTS

trong mt phng qun l.

29

Thit bmng

Giai on2009-2010

n nm2012

SGSN

S lng thit b 10 10Tng dung lng thitb (S lng ngidung/PDP Ctx)

9,500,000/7,600,000

15,500,000/14,600,000

GGSN

S lng thit b 5 5

Tng dung lng thitb (Tnh theo s ngidung)

7,600,000 14,600,000

Bng 3-3: D kin thit b nng cp H thng GPRS/EDGE/3G ca

Vinaphone.

H thng IMS: nng lc 500K thu bao cung cp cc dch v:

Push to Talk; VoiP; Instant Messaging; Multimedia telephony; H

thng SDP (Service Delivery Platform)

Mt s c im v tiu chun cng ngh ca h thng:

Ph hp vi cc tiu chun ca 3GPP

H tr cung cc dch v cho c mng 2G hin ti v 3G

UMTS

Giao din IuPS s dng IP, Frame Relay s dng trn giao

din Gb vi mng 2G/2.5G ca Vinaphone.

C kh nng kt ni vi IMS v p ng dch v IMS iu

khin


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28

tuy n 2G (BSS) S lng BSC 219Mng truy nhp vtuyn 3G (RNS)

S lng Node-B 1776S lng RNC

28H thng Softswitch Mng VinaPhone c: 27 tng i (tng dunglng l 17.400K) v 07 tng i lmchcnng Gate (tng dung lng l 165.000 Erl),t l Softswitch chim khong 31%;

H thng GPRS H thng GPRS vi tng thng lng400Mbps (dung lng 3.500K phn SGSN,3.760K phn GGSN);

Cc h th ng khc Dung lng h th ng IN l 33.700K; Dunglng h thng SMSC l 10.496K v anglp t tip 10.000K; H thng HLR tptrung vi tng dung lng l 60.000K.

Bng 3-1: Nng lc hin trng mng Vinaphone.

H thng Mobile Softswitch (phn mng CS):

Thit bmng

Giai on2009-2010

n nm2012

MSS

S lng thit b 8 11

Tng dung lngthit b (Tnh theo sngi dung)

10,000,000 15,000,000

MGWS lng thit b 14 17Tng dung lngthit b (Tnh theo sngi dung)

10,000,000 15,000,000

Bng 3-2: D kin thit b nng cp H thng Mobile Softswitch ca

Vinaphone.

H thng GPRS/EDGE/3G (phn mng PS):

17

2.1.2.3Cc c ch QoS trong Release 5Ni dung ch yu ca R5 l thm vo phn h iu khin IMS.

Cc c ch QoS mi l kt qu ko theo ca vic a thm phn

h iu khin IMS. Trong cc release trc , vic xc nh QoS

c thc thi bi dch v lp truyn ti l da trn cc QoS profile

m UE yu cu. Cc c tnh QoS khc nhau c s dng cho

cc ng dng khc nhau bng cch ch ra cc APN cho cc ng

dng, nhng thng tin xc nh dch v linh hot khng c

chun ha. Trong R5 thay i c ch ny. Trong R5, mt c

ch mi gi l SBLP (Service-based local Policy)c a ra.

C ch ny cho php P-CSCF (proxy-call session control

function) cung cp mt cch linh hot cc thng tin ca cc phin

ca ng dng cho dch v lp truyn ti. C th l SDP (Session

Description protocol) c s dng lm giao thc m t phin cho

cc ng dng trong IMS. Sau khi khi to knh truyn ti, cc

thng tin v QoS c th cp nht theo s thay i ca cc phin

IMS. h tr chnh sch SBLP, R5 a ra cc nh ngha mi

gm: chc nng quyt nh chnh sch PDF (policy decision

function) nm trong P-CSCF v im thc thi chnh sch PEP

(policy enforcement point) nm trong GGSN.

R5 cna ra 2 tnh nng mi lin quan n QoS l:


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18

Cc b lc c thit lp ti GGSN m bo ch cc

lung d liu n v i t UE c nhn thc mi c

i qua. Vic ng m cng ra vo cho cc lung d liu

da trn cc thng tin trng thi ca phin ca ng dng.

Min GPRS v min IMS c th trao i cc thng tin v

tnh cc nh mt phn trong cc thng tin nhn thc

QoS.

Ngoi ra, cc c ch QoS trong cc release trc vn c gi

nguyn.

Hnh 2-5 Cc chc nng qun l QoS trong mt phng iu khin theo R5.

27

CHNG III: SUT NG DNG SLA

TRONG MNG DI NG 3G CA VNPT

Phn u ca chng ny i vo kho st hin trng v phng

hng pht trin ca cc mng 3G ca VNPT, t a ra cc

phn tch, nh gi nng lc ca cc mng ny trong vic thc thi

SLA. Phn tip theo, lun vn a ra cc khuyn ngh cho vic p

dng SLA cho cc mng 3G ca VNPT bao gm: cc khuyn nghv cc tham s cht lng i vi cc dch v; khuyn ngh v m

hnh thc thi SLA v khuyn ngh v l trnh trin khai SLA.

3.1 Phn tch nng lc mng di ng 3G ca VNPT trongkh nng h tr SLA

3.1.1 Mng VinaphoneHin trngv d kin pht trin tng th n 2012

Hin trng mng Vinaphone tnh n cui nm 2009:

Tham s S lngThu ba S lng thu bao

- Thu bao trsau

- Card

23,505,3711,667,040

21,838,331

Mng truy nhp v S lng BTS 11640


19/22

26

ra ngy cng c b xung v hon thin vi cc giao thc PDP

context, SDP l cc giao thc ng vai tr tha thun QoS; vic

chun ha PDF nh mt thc th c lp khi P-CSCF gip

cho c ch iu khin QoS cho cc dch v tr nn linh hot. Mc

d cc c ch ny c a ra ch yu nhm iu khin QoS

lp mng, nhng y cng l c s thc thi SLA. Phn ny

cng a ra m hnh nh x QoS gia UMTS v ch phn bit

dch v Diffserv, y l ni dung m cc chun ca 3GPP cha

cp ti.

Chng ny ca lun vn cng phn tchc tnh ca cc dch

v v a ra cc tham s KPI, KQI c bn cho cc dch v da

trn cc khuyn ngh m cc t chc chun ha nh ITU-T, ETSI,

v TMForum Phn 2.4 phn tch v a ra m hnh chc

nng ca h thng qun l SLA. y l c s cho cc bc tip

theo nhm xy dng h thng qun l SLA cho cc dch v.

19

2.1.2.4Cc c ch QoS trong Release 6Cc b xung v QoS trong R6 ch yu xoay quanh giao din Gq.

Trong R5, PDF nm trong P-CSCF. Trong R6, PDF c chun

ha v tch ring thnh mt thc th c lp. Gq l giao din mi

gia PDF vi chc nng ng dng AF( v d nh P-CSCF). Khi

PDF c th c dng nhn thc cc phin ca cc ng dng.

Ngoi ra, R6 cn cho php h tr cc giao thc m t v thit lp

phin khc ngoi SDP v SIP.

Hnh 2-6Cc thay i trong kin trc QoS theo R6.

2.1.3 nh x QoS gia 3GPP UMTS v c ch phn bit dchv Diffserv

Nh cp cc phn trn, 3GPP ch a ra cch thc chuyn

i cc tham s QoS gia UMTS vi RAB, vic chuyn i gia


20/22

20

UMTS v CN khng c 3GPP a ra. Phn ny ca lun vn

phn tch v a ra mt v d v vic chuyn i cc tham s gia

hai min ny.

Hnh 2-7Cc im nh x QoS gia 3GPP v IETF trong mng li UMTS.

Hnh 2-7 th hin cc im c s chuyn i gia c tnh truyn

ti UMTS v truyn ti trn IP.

2.1.3.1C ch phn lp QoS trong UMTSMc ny phn tch cc c trng ca c ch phn lp QoS ca

3GPP.

2.1.3.2Cch phn lp QoS theo IETFMc ny phn tch cc c trng ca c ch phn lp QoS theo

IETF.

Cc im nh x QoS gia 3GPP v IETF Difserv

25

Qun l SLA l mt quy trnh lin h mt thit vi quy trnh qun

l, iu hnh ca cc nh cung cp dch v theo m hnh eTOM

(enhanced Telecom Operations Map [19]). Hnh 2-10 m t mi

quan h gia qun l SLA theo m hnh eTOM.

Nh trnh by trong mc Error! Reference source not found.,

cc nghin cu v c ch thc thi SLA tp trung vo ba lnh vc:

AAA, CAC v Cc co ch m phn (Negotiation). Trong mng

3G cc c ch thc thi cc cng vic ny chnh l cc c ch m

bo QoS da trn cc cc giao thc nh SDP, PDP context,

COPS, Diametter c trnh by trong Phn 2.1.2. Tuy

nhin, cc c ch m bo QoS ny c s dng cho cc tham s

cht lng mng. V vy m bo cc tham s cht lng dch

v trong SLA (thng khng phi l cc tham s cht lng mng

m l cc tham s m ngi s dng hiu v cm nhn c v

cht lng dch v) cn c cc c ch nh x gia cc tham s

cht lng dch v sang cc tham s cht lng mng li. Qu

trnh ny chnh l s la chn cc tham s KQI no cho cc dchv vi phng php lun v la chn cc KQI trnh by trong

cc phn trc ca lun vn ny.

2.5Kt chngChng ny nghin cu v tng hp cc c ch QoS do 3GPP

a ra trong kin trc E2E QoS. Cc c chQoS c 3GPP a


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24

Hnh 2-9 SLA management.

Product

Offer

Service

Dev. &

Retirement

Manage

Internal SLA

Service

Quality

Analysis & Rpt

Resource

Data

Collection

Resource

Dev.

Product

Dev. &

Retirement

Customer

QoS/SLA

Mgmnt

Supply Chain

Capability

Mgmnt

Order

Handling

Supply Chain

Dev & Change

Mgmnt

S/P

Performance

Management

S/P

SLA

Management

SLARequirements

SLATemplates

TargetKQIs

Target

KPIs

KQI / KPI

Mapping etc

ActualSLAs

TargetData

ActualData

S/PData

SLAReqs

S/P SLA SLAObjectives

S/PPerf. Data

KQIs&Violations

Operations Domain

Customer / Marketing Domain

H

nh 2-10 Lung cc x l SLA trong m hnh eTOM.

To SLA

m hn

Thc thi

Gimst

Bo co

Du tr

Thanh ton

21

2.1.3.3nh x QoS gia 3GPP v IETFDa vo cc phn tch trn, Bng 2-1 c a ra nh mt v d

v vic nh x QoS gia 3GPP UMTS v IETF diffserv.

Cc lp QoS trong UMTS Cc lp QoS theo IETFTrafic class THP ARP PHB DSCPConversation - ARP1 EF 101110Conversation - ARP2 EF 101110Conversation - ARP3 EF 101110Streaming - ARP1 AF41 100010Streaming - ARP2 AF42 100100Streaming - ARP3 AF43 100110Interactive THP1 ARP1 AF31 011010Interactive THP1 ARP2 AF32 011100

Interactive THP1 ARP3 AF33 011110Interactive THP2 ARP1 AF21 010010Interactive THP2 ARP2 AF22 010100Interactive THP2 ARP3 AF23 010110Interactive THP3 ARP1 AF11 001010Interactive THP3 ARP2 AF12 001100Interactive THP3 ARP3 AF13 001110Background - ARP1 BE 000000Background - ARP2 BE 000000Background ARP3 BE 000000

Bng 2-1 nh x gia cc lp QoS trong UMTS v DSCP.

2.2 Cc tham s SLA c bn cho cc dch v trn mngdi ng 3G

Trn c s phng php lun xc nh cc tham s cht lng cho

SLA, cng cc khuyn ngh v cc vn cht lng dch v m

cc t chc a ra nh ITU-T G1000 [17], ETSI ETR 003 [18]

, phn ny ca ti a ra mt s cc KQI c bn cho cc dch


22/22

22

v trn mng di ng 3G. Qua qu trnh nghin cu, tc gi lun

vn ny nhn thy cc KQI c a ra bi Tmforum trong

GB923 l ton din hn c v th cc tham s KQI c bn a ra

y cng da trn cc KQI m Tmforum khuyn ngh. Cc tham

s c chia ra thnh cc loi:

Cc KQI truy nhp dch v

Cc KQI v s dng dch v

Cc KQI v kt thc dch v

2.3 Cc tham s SLA cho ngi dng u cuiVic a ra cc tham s cht lng hng ti ngi s dng i

hi cc tham s m nh cung cp dch v a ra phi tha mn cc

nhu cu ca khch hng. V th cc tham s hng ti ngi s

dng thng phi l cc tham s m ngi s dng hiu v cm

nhn c, ch khng phi l cc tham s v mng li.

Hnh 2-8 th hin s phn loi v cc tham s theo cc dch v v

yu cu QoS ca cc dch v trong vic m bo cht lng dch

van khch hng.

23

Hnh 2-8 nh x cc yu cu vQoS i vi cc dch v theo ITU-T.

C th v cc tham si vi cc dch vc a ra trong cc

phn:

2.3.1 Audio2.3.2 Video2.3.3 Data2.4Qun l, gim st cc tham s SLA trn mng di ng

3G

Hnh 2-9 th hin cc ni dung ca qun l SLA. V v tr, qun l

SLS nm trn lp qun l mng v nm di lp qun l kinh

doanh.

Documents

Thoả thuận dịch vụ SLA trong mạng di động 3G