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TNG QUAN V NGNChng I:Tng quan v mng th h mi.Chng II:Cu trc mng NGN.Chng III:Chuyn mch mm SoftswitchingChng IV:Bo hiu trong mng th h sau NGNChng V:Dch v trong mng vin thng Chng VI:Cc vn lin quan n dch v.Chng VII:Gii php NGN ca cc hng.Chng VIII:Chin lc pht trin NGN ca ngnh.

Chng I:Tng quan v mng th h mi.I.Mng vin thng hin ti1.Khi nim mng vin thng.Mng vin thng l mt h thng gm cc nt chuyn mch c ni vi nhau bng cc ng truyn dn,nt c phn thnh nhiu cp v kt hp vi cc ng truyn dn to thnh cc cp mng khc nhau.

Cu hnh mng c bnCu trc mng phn cp

Nt 1:trung tm chuyn mch qu giang quc tNt 2:trung tm chuyn mch qu giang ng diNt 3:trung tm chuyn mch qu giang ni htNt 4:trung tm chuyn mch ni htNt 5:trung tm chuyn mch t xa.

II.Mng vin thng th h mi (Next Generation Network)1.nh ngha.Mng vin thng NGN cha c nh ngha chnh xc song ta c th tng i n nh sau:Mng thng tin th h mi NGN ra i l c s h tng thng tin duy nht da trn cng ngh chuyn mch gi,trin khai cc dch v 1 cch a dng nhanh chng,p ng s hi t gia thoi v s liu,gia c nh v di ng.2.c im ca NGNMng NGN c 4 c im chnh :Nn tng l h thng mng m.Mng NGN l do mng dch v thc y nhng dch v phi thc hin c lp vi mng li.Mng NGN l mng chuyn mch gi da trn mt giao thc thng nht.L mng dung lng ngy cng tng,c tnh thch ng tng v c dung lng p ng nhu cu.Chng II:Cu trc mng NGNI.S tin ha t mng hin c ln NGN1.Chin lc tin haso snh mng hin ti v tng laiQu trnh tin ha v cu trc t mng hin c ln NGN.

V vy,chin lc pht trin mi ca NGN.

2.S tin ha t cc mng hin c ln NGNS pht trin t PSTN ln NGN i vi cc mng dch v khc

II.Cu trc chc nng ca mng NGN.S pht trin ca mng hu tuyn da trn cng ngh IP1.M hnh phn lp chc nng ca mng NGN

III.Cu trc vt l2.Phn tchCu trc vt l v chc nng cc thnh phn mng NGN.

Chng III:Chuyn mch mm Softswitching

I. S ra i ca Softswitching tng : kt hp u im chuyn mch knh v gi.Gii php: to ra mt thit b thc hin chuyn mch thoi c dng knh v gicng vi tch hp phn mm x l cuc gi.Thc hin: tch ring chc nng x l cuc gi ra khi chc nng chuyn mch vt l.Khi nim: chuyn mch mm l phn mm thc hin chc nng x l cuc gi trong HTCM c kh nng chuyn ti nhiu loi thng tin vi cc giao thc khc nhau.V tr: l lp iu khin cuc gi v bo hiu

II. Thnh phn chnh ca SoftswitchingCc thc th chc nng ca softswitch l MGC-F, CA-F, IW-F, R-F v A-F

Kt ni vi cc thnh phn khc

Media Gateway Controller (MGC)L thnh phn chnh ca SoftswitchingChc nng :

Cc giao thc MGC c th s dng:

III. Cc giao thc1. Sesion initiation protocol (SIP)L mt giao thc bo hiu iu khin thuc lp ng dng dng thit lp, iu chnh v kt thc phin lm vic ca mt hay nhiu ngi tham gia.SIP l mt giao thc n gin da trn vn bn c s dng h tr trong vic cung cp cc dch v thoi tng cng qua mng Internet.Thnh phn : User Agent Client (UAC): khi to yu cu SIP User Agent Server (UAS): lin lc v p tr ng dng vi ngi dng Proxy Server : chng trnh ng dng trung gian to yu cu SIP Location/Registration Server : ly thng tin v v tr ngi gi Redirect Server: nhn t SIP dch a ch v gi ng dng v khchu nhc im : Cu trc n gin, d sa i , kh nng m rng, ng dng cao v chi ph thp Cn mi nn cn hon thin, cp ti phm vi hp nn cn kt hp vi cc giao thc khc, giao tip vi mng chuyn knh km.

2. Media Gateway Controller Protocol (MGCP)

Khi nim: L 1 giao thc mc ng dng iu khin hot ng ca MG. S dng phng thc Master/slave. Bao gm : MGC v MG u im:MGCP c bit hu ch vi cc ng dng trin khai ln, cc h thng phc tp.Tch hp tt vi mng SS7, thun tin cho qu trnh iu khin v x l cuc gi.Tch ring bit 2 chc nng chnh l chc nng iu khin lung phng thc v chc nng bo hiu nn vic thi hnh d dng hn.Nhc im:Phc tp vi cc ng dng nh, ngoi ra ch tp trung chuyn i gia cc lung phng thc.

3. Signaling Transport Protocol (SIGTRAN)Khi nim : L giao thc mi thay th cho TCP cn nhiu hn ch theo quan im d tha v thi gian thc, dng truyn thng tin t mng PSTN qua mng IP.

M hnh chc nng: M2UA: kt ni ti thit b c khng cn SPM2PA v M3UA: kt ni gia cc im bo hiu cho php IPSUA: kt ni vi cc im bo hiu cho php IP vi cc ng dng TCAP (SCP, HLR)IUA: truyn ti bo hiu thu bao ti chuyn mch mm SCTP:giao thc datagram tin cy.RTP: giao thc dng truyn cc thng tin yu cu tnh thi gian thc nh thoi v hnh nh.

IV. Hot ng ca SoftswitchingKhi qut hot ng ca SoftswitchingTn hiu off-hook (1)in thoi gi (PSTN)MGC gi LE gi; SGMG giin thoi b gi (PSTN)MGC b giMG b giLE b gi; SGTn hiu dial Tone(2)Thng bo (2) Yu cu to kt ni (3) Gi s (4) Quyt nh nh tuyn (5) Yu cu thit lp cuc gi (6)Yu cu to kt ni (7)Tn hiu chung (8)Thu bao b gi ri (9)ang lin lc vi b gi (10)Tn hiu chung phn hi (11) (12)Hnh thnh kt ni cho hai thu bao (13)ang lin lc vi b gi (10)ang lin lc vi b gi (10)Qu trnh thc hin cuc gi s dng Softswitching

V. Kt lun

Chng 4Bo hiu trong mng th h sau NGN

Gii thiu v bo hiuQu trnh bo hiu l mt qu trnh khng th thiu trong hot ng ca mng vin thng gip cc thnh phn trong mng c th trao i thng tin vi nhau . C 4 loi bo hiu.Bo hiu H.323Tng quan v H.323Cc thnh phn H.323

Mt vng hot ng H.323 l tp hp tt c cc u cui ,cc GW ,cc MCU chu s qun l ca mt GK .Vng hot ng ny c lp vi topo ca mng thc t v c th bao gm nhiu on mng (segment ) ni vi nhau qua router hay cc thit b khc.

2.1Terminal 2.2 Gateway

3.Vng hot ng

174.Cc giao thc thuc H.3234.1 Cc giao thc m ha v gii m cho tn hiu thoi v hnh Gm :G.711, G.722, G.723.1, G.7294.2 Giao thc bo hiu RAS (H.225.0)Bn tin RAS c 3 loi : yu cu (xRQ ) ,xc nhn (xCF) ,t chi (xRJ).Cc chc nng c bn :Khm ph GK hay xc nh GKng k im cuiThot khi vng kt niS thay i bng thngTrao i thng tin trng thi4.3 Giao thc bo hiu cuc gi4.4 Giao thc bo hiu iu khin H.245 Cc chc nng chnh :- Trao i kh nng - Bo hiu knh lun l - Xc nh Master/ Slave- iu khin hi ngh

Qu trnh thc hin bo hiu

Chng V:Dch v trong mng vin thng I.Gii thiu

II.Nhu cu NGN i vi cc nh cung cp dch v.III.Yu cu ca khch hng.IV.Dch v NGN

1.Xu hng cc dch v trong tng lai 2.Cc c trng ca dch v NGN3.Cc dch v trong mng NGN3.1 Dch v thoi3.2 Dch v d liu3.3 Dch v a phng tin3.4 Dch v mng ring o (hnh 5-4)3.5 Tnh ton mng cng cng (PNC)3.6 Bn tin hp nht3.7 Mi gii thng tin3.8 Thng mi in t3.9 Cc dch v chuyn cuc gi3.10 Tr chi tng tc trn mng3.11 Thc t o phn tn3.12 Qun l ti nh

V.Kin trc dch v th h sau

Chc nng ca Server ng dng (hnh 5.7)Chc nng ca Media Server

1.Kin trc phn lp

2.Giao din cc dch v m API

3.Mng thng tin phn tn

VI.Kt lun

Chng VI:Cc vn lin quan n dch vI.Bo mt1.Gii thiuKh nng bo mt ca mt mng vin thng l mt trong nhng yu t hng u quyt nh cht lng cng nh tnh kh dng ca mng vin thng .C nhiu thnh phn yu cu v bo mt mc cao trong mng NGN:Khch hng/ thu bao.Cc nh vn hnh mng, cc nh cung cp dch v, cc nh cung cp truy nhp.Cc quc gia.Cc quy nh v cc mi trng k thut.2.Cc yu cu bo mt Mt nh cung cp mng hay dch v s quyt nh gii hn thc hin bo mt da vo kt qu ca phn tch nguy c v nh gi ri ro. Sau nh cung cp s to ra mt chin lc bo mt. Hnh sau m t s tng tc ca cc khi lin quan n bo mt.

3. Cc vn cn bo mt Cc vn ny c thc hin trong mi dng cu hnh NGN, bao gm cc dng truyn dn khc nhau v x l cc nguy c sau y:T chi dch v.Nghe trm.Gi dng.Truy nhp tri php.Sa i thng tin.T chi khch hng.4. Cc gii php tm thiCc bin php tiu biu:Nhn thcCh k siu khin truy nhpMng ring oPht hin xm nhpGhi nht k v kim tonM ha

Chng VII:Gii php NGN ca cc hng.I. Gii thiu chungHien nay tren the gii, cac to chc vien thong van con ang nghien cu ve NGN e a ra 1 chuan thong nhat chung. Tuy nhien cac hang vien thong ln eu a a ra cac giai phap NGN cua rieng mnh. o la cac hang Alcatel, Siemens, Cisco, Erickson,Commworks, Lucent, Nortel, v.v.I. Giai phap cua SIEMENS1. Gii thieu ve giai phap NGN cua SIEMENSGiai phap xay dng mang the he sau cua SIEMENS co ten la SURPASS.

Giai phap NGN cua SIEMENSTheo quan iem cua SIEMENS, khi xay dng mang the he sau NGN ta se xet da tren 4 kha canh sau:Chuyen mach the he sau.Truy nhap the he sau.Truyen tai (quang) the he sau.Mang quan ly the he sau.

Chuyn mch th h sau Cu trc chuyn mch ca SURPASS da theo m hnh do MSF (Multiservice Switching Forum) a ra. Trong phn ny ta xt n cc yu t sau:Trung k o (virtual trunking).Chuyn mch gi ni ht (packet local switch).Truyn thoi qua mng bng rng.Bo hiu.Cc ng dng th h mi.Truy nhp th h sau Mng qun l th h sauIII.Gii php ca alcatelAlcatel a ra gii php tng th gm 6 bc pht trin t mng vin thng hin ti tin ti mng NGN nh sau : Bc 1: (im xut pht) Mng PSTN cho thoi v quay s truy nhp Internet. Bc 2 : Cng c mng PSTN v hi t vi mng s liu. Bc 3 : Thoi trn cng ngh gi i vi cc dch v ng di. Bc 4 : Thoi trn cng ngh gi i vi cc dch v truy nhp ni ht.Bc 5 : Cc dch v a phng tin c trin khai.Bc 6 : Mng vin thng th h mi NGN hot ng vi y cc tnh nng.IV. Kt lun

Chng 8:Chin lc pht trin NGN ca ngnh Gii thiu chung Nguyn tc thc hin trin khai mng NGN 1. Yu cu chung 2. Mc tiu xy dng 3.Qu trnh chuyn i tng bcHng pht trin mng NGN i vi cc nh cung cp dch v khc nhau .

Nh cung cp dch v c nh ESP1.1 i vi mng truy nhp1.2 i vi mng truy nhp1.3 Yu cu i vi mng2. Nh cung cp dch v mi ISP/ASPIV. Cc gii php xut cho vic pht trin mng NGN ca ngnh Gii php xy dng NGN trn c s mng hin ti ND ca gii php :Phng n 1v phng n 2 gm 4 bc .u imNhc im 2 . Phng php xy dng NGN hon ton mi ND ca gii phpu im Nhc im 3 .Nhn xt nh giV. Nguyn tc t chc mng NGN ca VNPTPhn vng lu lng T chc lp ng dng v dch vT chc lp iu khin