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Nhm 6 :

V Vn Quyt(nhm trng)

L Th Hoa .

Trn Th Hu .Nguyn Quc Hng .

Nguyn Th Phng Mai

Nguyn Th Phng B.

Nguyn Mai Nga .

Gio vin : TS L Anh Ngc.

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NI DUNG TRNH BY

1. Gii thiu chung.2. Nguyn tc chung.3. Kin trc NGN v cc chc nng tiu

biu .4. Thc thi.5. Kt lun .

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Giithiu chungC IM CA MNG

VIN THNG HINTIH thng mng vinthng hin ti c nhiunhc im m quan trngl:Ch truyn c cc dch

v c lp tng ng vitngmng.Thiummdo.Km hiu qu trong vic

bodng, vn hnh cngnh s dng ti nguyn.Ti nguyn sn c trongmt mng khng th chias cho cc mng khc

cng sdng. 3

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Gii thiu chungChnh v nhng hnch trn

thc y cc t chc chunha vin thng quctnh ITU-T,IETF, 3GPP,...a ra m hnhmng th h sau(NGN) c khnng p ng tt c cc dch v

trong mtmng duy nht.- NGN c xy dng trn nn

tngca cc mngthhtrckthpvikthutchuyn

mch gi theo giao thc IP.- Khng nhng cung cp cc

dch v vin thng nh trcy,NGN cn b sung thmdch v aphng tinbngrng, nhanh v thng minh. Nhu cu ci tin mng 4

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Nguyn tc chungITU-T ra khuyn ngh Y. 2001 nh ngha v NGN nh sau:

Mng th htip theo(NGN)

N cho php ngisdng truy cpnmngca cc nhcung cpdchv c sn v / hoc c thlachn cc dchv mong mun

Mtmng lida trn chuynmch gi c th cungcp dch v vin thng v c th s dng nhiubngthng rngQoS - cho php cng ngh truyn tih trdchv,trong cc chcnng dchv l hon ton clpvichcnng truyn ti (nn tng cng nghgingnhmngli giao thng).

N htrtnh di ng ni chung, cho php cung cp ccdchv ph hp vphbin cho ngi dng.

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Nguyn tc chungITU-T ra khuynngh Y.2011 v nguyn tc chung.

Khuynngh Y.2011 ch ra s khcbittimnnggiacc phn lpcah thng NGN v by lpca m hnhOSI nhcnhngha trong ITU-T theo X.200 : S lng cc lp c th khng phi by lp . Chc nng cc lp ring bit c th khng tng ng

vi cc lp ca OSI BRM. Mt s quy nh hoc iu kin ( nh ngha) b cm

trong OSI c th c hoc khng c p dng trongNGN.

Cc giao thc c th khng phi giao thc OSI (mt vd ng ch l IP). C th khng tun th yu cu ca OSI.

Trong Y.2011 nhng g ph hpvimcchca NGN

c trong OSI scgili. 6

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Nguyn tc chungM hnh tham kho cho NGN theo ITUT khuyn ngh Y.2011.

Trong NGN phn chia chc nng vo 2 nhm ring bit :iu khin v qun l .

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Kin trc NGN v cc chc nng tiubiu .

Kin trc NGN . 8

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Cung cpktni cho ttc cc thnh phn v chcnngvt l ringbit trong NGN. Cung cpktni IP cho thitbucui,iukhin v

cho php lutr trn cc my ch bn trong NGN. Cc tngvnchuync trch nhim cung cp (end-to-end)chtlngdchvtt QoS.

Qun lngi dngcui truycp vomng ,phthuc vo

cng nghca mngtruy nhp.

Vn chuynthng tin quamng truynhp,cungcp c chQoS,kimsot trc tiplu lngngi dung

m bo vn chuyn thng tin trong sutmng li,cung cp phng tin phnbit cht lng vn chuyn trong mng

X l lulng trckhi truy cp

c spnhp vomng li.

Cung cpkh nng

nh hngti cc mngkhc,thm

ch cn tic NGNkhc thucnh qun tr

khc

X l cc ngun ti nguyntruyn thng cho vic cungcp cc dch v

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Cung cpdchvda trn tng phin v khng da trntng phin, cung cp tt c cc chc nng mng linquan ndchvhin c ca PSTN/ISDN v khnng ,giao dinvi cc thitbca khch hng (legacy).

iu khin phin, xc thcv y quyn ti tng dch v,

c th bao gm chc nngkim sot ti nguyn truyn

thng

i dincho trnh

bin dchca ngidng v d

liu iukhin khc

vo mtcu hnh

ngi dng

Kim tra kt ni v iu khincng,bao gm iu khin vic bin

dch a ch mng v cng(NAPT) vim m phn bit dch v(DSCP)

Kim sot s tham gia vo mng,h

tr thit b ngi dng cui trong vicng k v s dng NGN

iukhin

phin,chc

nng xcthc vy quynti tngdch v

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Cho phpcc nh

khai thcNGN qun

l mng

v cungcp ccdch v

NGN vicht lngnh mong

i , bomt, v tincy

Giao dincho ngidng cuibao gm

c giaodin vt l

v chc

nng (iukhin)

i din cho trnh bin dch ca ngi dng v dliu iu khin khc vo mt cu hnh ngi dng

Ranhgii ivi cc

nh cungcp ng

dng bnth ba.

Giao din gia ngi

dng vi mng

Giao din gia mng

vi mng

Nhcung

cp dchv

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Thc thiHthng con aphngtin IP cho NGN (IMS).

1. Khi nim.IMS l mt tphpca cc thc thchcnng

mng li v giao din c s dngbi mt nhcung cp dch v mng ,cung cp dch v cho cc

thu bao da trn SIP.

M hnh IMS chung 12

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2. Khi qut chung v IMS

IMS

c im

Chc nng

c lp

vicngnghmngtruycp.

Xydng

trn ccgiao

thc caIETF

H tr

cho nhkhai thcmng,

thu ph -thanh

ton v

bo mt.

Giao dinchung ca

cc my ch

ng dng chothanh

ton,bo mt,d liu thubao , kimsot dch v

Phihp vthc thi

QoS

Truynthng

da trn

lpphin

Cung cpmi tng

quan thanhton v thuph gia cclp dch v,phin, vn

ti

Da trnnn

mng liIP

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Thc thi

Hthng con aphngtin IP cho NGN (IMS).3. Cu trc .

IMS ch ra s khcbitgiamngli v truy cp:

- Mng truy cp l mt tp hp cc thc th cung cpgiao thc IP kt ni giaphm vi ngi s dng vmngtruyn ti li.

- Mng li l mttphp cc thcth cung cpkt niIP giamtmng truy cp v mtmng truyn ti li

khc,gia 2 mng truy cphocgia 2 mng truyntili.

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Thc thiHthng con aphngtin IP cho NGN (IMS)

Tphp phn vng ca mng.

IMShtrcho tnh di ngcangisdng.

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Thc thiH thng con a phng tin IP cho NGN

(IMS).

4. Cc thc th chc nng IMS.

Cc im tham chiu v cc thc th chc nng IMS16

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Cc thc th chc nng IMS.

Tin hnh ng k giangi dng v mng.Tng tc vi HSS qua dim tham chiu Cx c c thng tin thubaoTham gia vo ttc cc qu trnh bo hiu th thng IMS vngidng.

Quytnhlachn AS no s cung cp cho ngi dng.Thchin chnh sch ca nh cun c . 17

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Tng tc giangi dng v mng.Htrcc khnngcthcamngtruy cp m trong n csdng.

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-mbo truyn ti yu cu t UE ti my chSIP v ngcli.-Xc thc v thit lpbomtvi thitb IMScangi dung.

- Tham gia vo qu trnh tnh cc 19

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nh tuyn thng ip yu cu SIP t mtmng khc n S-CSCF tng ng vngcli.

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Chacsdliu thu bao cho IMS.N chang thng tin nh : nhndngngi dng, tn S-CSCF gn cho ngidng, h s roaming, thng s xc nhn

thc v thng tin vdchv thu bao. 21

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Cung cpkim sot dchv cho IMS,c thtng tc vi HSS trn giao dinSh c c thng tin hsthu bao.Htrcc dchv thoi khc nhau

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La chon mng PSTN m lu lngs c nh tuyn sang

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o H tr s tng tc gia mng IMS vPSTN.

o H tr s chuyn i t giao thc SIPln ISUP v iu khin cng phngtin cho mc chuyn i

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- Hotngdiskim sot ca MGCF.

- Cung cpphng tin truyn ti thng tinthoi , d liu,fax,video gia mng gi IP vmng PSTN

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iu khin ngun ti nguyn truynthng ca MRFP .Gii m thng ipnt my chngdng AS truyn qua S-CSCF.Tham gia vo qu trnh tnh cc .

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Cung cp ti nguyn diskim sot caMRFC cho qu trnh x l truyn thng. N h tr truyn thng trn dng , chuynm,phn tch truyn thng v cc chc nng

khc.

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B truy vn bi I-CSCFhoc S-CSCF tm ra achca HSS

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Thc thiH thng con a phng tin IP cho NGN (IMS).

5. S dng SIP v SDP trong IMS. SIP(Session Initiation Protocol): Giao thc khi to phin l giao thc

thuc lp ng dng dng cho vic thit lp, iu chnh, kt cui cc phina phng tin.

SDP(Session Description Protocol):Giao thc m t phin l mt nh

dng m t cc thng s ca dng thng tin a phng tin.IMS s dng mt cu hnh SIP c th. n nh ngha m rng cho cc

tiu v cc thng s nh a ch c th ca cc nh khai thc vinthng. Mt s v d tham s c th nh diy :

Mt tham s mi auth-param c nh ngha cho tiu xc thc

web. Mt tham s tokenized c s dng m ha, gii m cc tiu

ca SIP.

Tham s ICN-charging-info c nh ngha cho cc tiu P-Charging-Vector.

Mt tham s nh ngha cho P-Access- networkinfo . 29

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Thc thiH thng con a phng tin IP cho NGN (IMS).

6. Ci tin IMS cho cc ng dng ca mng NGN.Cc thng s k thut ca IMS c pht trin s dng trong mng

truy cp di ng v da trn 1 s gi nh lin quan n mng truy nhp , vdnh bng thng c sn . S khc bit vn c gia cc mng truy nhp khcnhau s c nhng tr ngi c th trn cc chi tit k thut ca IMS. Vd nh :

- H tr cho X-DSL(nn tng ca cc mng truy nhp)

- H tr a IPv4 vo ti khon

- H tr cho cc chc nng NAPT

- Gim s hn ch v bng thng

- S khc bit trong qun l v tr

- S khc bit trong th tc t ch ngun ti nguyn trong mng truynhp

S ci tin nhng ci trn c xem xt bi nhng t chc tiu chunkhc nhau h tr s dng IMSs trong NGNs . s cn thit phi chuyni cu trc ca IMS s lm cho tiu chun IMS c bn c s hu bi

d n hp tc th h th3 (3GPP) v 3gpp2 nh mt phn ca tng lai.30

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7.So snh IMS trong kin trc NGN ca cc t chc tiuchun

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7.So snh IMS trong kin trc NGN ca cc tchc tiu chun.

Cch tip cn IMS ca mi t chc l khcnhau, ITU-T nhhng xy dng mng NGN

ca mnh t nn tng mng c nh, 3GPP xydng NGN vinntngmng di ng 3G. D lachnnntng no ina, khi xy dng NGN thttc cc mng hin tinh 3G,hay PSTN/ISDN... uhi t chung thnh mtmng duy nhtcung cpaloi hnh dchvtingi dng ucui.

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Kt lun

Bi bo ny trnh by vnhng nguyn tc chung vgiithiuvnhng m hnh cho mngthh sau ca ITU-T .chng ta xem nhng khi nim gn y nht di dngkin trc chcnng . n ssmxuthingingnh l mt

xut mi ca ITU-T. Kin trc IMS , nhng thc th tiuchunca IMS , v giao dinsc p dng cho NGNs sc cung cp,h trcho SIP- nhngdchvcbnc

pht trinbinhng nh iu hnh mng .

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