1

Ngay my, Khi internet bring rong phat trién manh me, da tao nén su thay doi manh

me trong tinh vuc truyen hinh. Hién nay bén canh truyén hinh tuong tir, truyen hinh so,

truyén hinh vé tinh, truyen hinh cap, truyén hinh internet, chiing ta con biét den IPTV.

IPTV thiréng dupc cung cap cung voi dich vu Video-on-Demand (VoD) va cung co the

cung cap cung voi c:ic dich vu Internet kh:ic nhu truy cup Web vii VoIP, do do con dupc

gpi la “Triple P lay” v:i dirpc cung cap bc›i nh:i khai thac dich vii bang rong sir dung chung

mot ha I:ing mang. IPTV cé cc hoi rat lori dé ph:it trién nhanh chong khi ma mang bang

rong da cé mat o khap moi rim va hién nay da cé trén 100 trieu ho gia dinh sir dpng d|ch

vu. bring rong tre’n to an cau. Rat nhiéu nha cung cap dich vu vie’n thong lori trén the gioi

dang trie’n khai thaw do IPTV v:i xem nhu mot cc hoi moi dé thu lot nhu(an tir th|i trtrong

hién c‹i cua ho v:i cor d‹i nhu in)ot giai phap tir bao ve truoc su tan s:in ciia cac dich vp

truyén hinh c:ip. Tai thi trudng cung cap dich vu ci Viét Nam, dich vu IPTV da bat d:iu

duoc cung cap véii mot so dich vu cc ban. Diéu n:iy xem nhu I:i cc hoi kinh doanh dich

moi cii a cac nh:i cung cap dich vu tai Viét Nam, kh i in:i cc so ha tang mang bang rong

da vii dang phat trién manh me’ cung voi su doi ho i nhu ciiii cua kh:ich hung ng:iy c:ing

cao. Noi dung bai viét se’ cho chung ta thay to ton cua dich vu IPTV trong

wang bang rong va kh:i uang irng dung trie’n khai IPTV trén truéing vien thong Viét Nam.

Trong bai tie’u lu )an my em trinh bay tong quan ve’ IPTV, cac khai mean cc ban, cac dich

vu ting dung cua IPTV,ciic tiéu chuan chat luong ciia dich vu IPTV trien khai trén thuc

té va xu huong phat trién cua IPTV o Viét Nam cung nhu trén to an thé gio.

Chwnng I: Gioi thiéu chung vé IPTV, trinh bay khai niém IPTV va cac uu diém nhuoc

diem ciia no so voi cac dich vu truyén hinh khac. Mo ta cac thanh phan chinh cua he

thong cung cap dich vp IPTV va cac dich vp cc ban.

Chwnng II: Xay dimg chat luong dich vu cii a IPTV

Chwo’ng III: Thuc trang trién khai IPTV o VNPT, tim hiéu tlnh hinh trién khai cac d|ch

vu IPTV cua VNPT va gun phap trién khai dich vu.

Trong quit trinh tim hiéu va nghién ciiu vé dé tai mac du da co nhiéu co gang, nhung ,

nhung do con nhiéu han che ve trinh do cung nhu thoi gian nén chac chan de Hi khong

the tranh khoi nhfliig sai sot. Em rat mong nhan duoc su phé binh va gop y cua cac thay

co giao

1

CHU’ONG I: GIOI THI U CHUNG VE IPTV

1.1 Tong quan ve h)e thong cung cap d]ch vq IPTV

1.1.1 Khéi ni°em IPTV

IPTV duoc got la truyén hinh trén giao thirc Internet, Telco TV hay truyén hinh

bang rong, v‹›i nghia truyen ta truyen hinh qiiang ba va/hoac video theo yen cau, chuong

trinh ph:it thanh co chat lirong cao trén mang bang rong. Theo quan diém cii a doi tuong

su dqng, viéc khai thac va xem IPTV cling giong nhu dich vu TV tra tién. ITU-T (ITU-T

FG IPTV) da chinh thuc chap thuan dinh nghia IPTV nhu sau:

IPTV dvpc dlnh ngh i"a lé céc dich vii da phvang tien nh ir truyén

h inh/video/audio/vén ban/do hpa/sé lien truyén Lai trén cac rnqng dva trén IP dvc›c kiém

seat nhém cung c p rnirc chat lir rig dlch vii, d man nguyén, d béo rn I va tin ciiy theo

yéu cm.

Tir quan diém cua nha cung cap dich vu, IPTV bao ham qua trinh thu thap, xu ly,

va truyén tai mot cach an to an rio dung video trén ha tang mang dna trén cong nghé IP.

Thaw gia vao qua trinh cung cap dich vu IPTV gore nhiéu nha cung cap dich vu tu cac

nha cung cap dich vu truyen hinh cap, truyen hinh ve tinh den cac cong ty Vién thong 16n

vii sirs nha khai thac mang riéng o nhie’u rim trén the gioi.

IPTV co mot so dac dure sau:

• HP trcr Intyén h inh tircmg tae - C:ic kha uang hoat dcing hai chieu ciia hé thong

IPTV cho phép nh:i cung cap d|ch vii dna ra mot so luong lori cac ring ding

truyén hinh tuong tac. Cac loai hinh d]ch vu dupc phan phoi qua dich vu IPTV cé

thé bao gore truyén hinh truc tiep tiéu chuan, truyén hinh d trung th¿c cao

(HDTV), ciic tro choi trirc tuye’n, va ket rio Internet toc d)o cao.

• Khong phu thu‹›e thii gran - IPTV khi két hop voi in:iy thu video so cho phép tao

chuong trinh noi dung khong phu thuoc thoi gian bang cc ché ghi v:i luu lai noi

dung IPTV v:i sau do cé the xem lai.

• Téng tinh ca nhan - He thong IPTV tu dau cuoi-dén-dau cuoi ho tro thong tin hai

chiéu va cho phép cac d i topg sé dung lua chon va thie’t lap viec xem TV theo

so thich riéng nhu chuong trinh va thoi gran xem ua thich.

• Féi/ i ‹zn ve béng th‹›ng th p - Thay vi phai truyén tin tat ca cac kénh cho moi doi

tuong su dung, cong nghé IPTV cho phép cac nha cung cap dich vu chi cén phai

phat c:ic kénh ma dci i tuong su dung yéu c:iu. Tinh uang h:ip dan n:iy cho phép

nhii khai thuc wang tiét kiem bang thong.

i dung IPTV

gioi han la dung cho cac way thu hinh. Cac khac hang thufing su dung

way tinh ca nhan va cac thiét bi di dong dé truy cap toi cac dich vu IPTV.

1.1.2Kien triic h(e thong IPTV

“-“’ End

Service ServiceProvider Provider

Core/Edge AccessHome ”

Network "-" '

Hinh 1. 1 : Kie’n tréc hé thong IPTV

1.1.2.1 Video head end

Cung nhu voi hé thong truyén hinh vé tinh so hay truyen hinh cap, dich vp IPTV

cling can co hé thong video head end. Day la rim ma noi dung linear (vi dq broadcast TV)

va on-demand (vi du phim) dupc ghi lai va d|inh dang dé truyén qua mang IP. Vé cc ban

thi daa viio cua bo head end la cac chuong trinh dupc thu qua ve tinh hoac lay tr c tiép tir

ciic bo broadcast hay ciic chuong trinh qua bo ket hop. Mot head end mang mot kénh

riéng va ma hoa no duoi dinh dang video so, nhu MPEG-2. Hién nay ciic nha cung cap

dich vu broadcast cung bat dau su dung ma hoa MPEG-4 vi no co mot so us dure hon so

voi MPEG-2 nhu yéu cau toc bo bit thap cho ca tin hiéu truyén hinh SD va HD.

Sau khi ma hoa, moi ke’nh dupc déing got IP vii dupc truyén qiia wang. C:ic kénh

my la cac dong IP multicast dién hinh, tuy nhién mot so nha san xuat cung st ding luong

IP unicast. IP multicast céi rat nhiéu uu diem vi no cho phép nh:i cung cap d|ch vu truye’n

mot luong IP trén kénh broadcast tu video head end dén mang truy nhap cua nha cung

sap d|ch vu. Cach n:iy co rat nhie’u uu diém khi nhiéu nguoi su dung muon su dung cfing

mot kénh broadcast tai citng thoi diem (vi du hang nghin nguoi xem cung muo xem mot

su kién thé thao).

1.1.2.2 Mijng Core/Edge ciia nha cung cap d]ch vq

Nhom cac luong video da ma hoa duoc truyén qua mang IP ciia nha cung cap dich

vu. Moi nha cung c:ip dich vu co mot mang riéng ciia ho v:i mang my thufing bao gore

thiét bi tu nhiéu nh:i san xuat. C:ic mang my co thé la mot hon hop cua mang lP hién co

va muc dich la xay dung mang IP cho viéc truyén video. Tai Edge, mang IP ket rio voi

wang truy nh:ip.

1.1.2.3 Mang truy nh"ap

Mang truy nhap la lien ket tu nha cung cap dich vu den thué bao khach hang. Két

rio bang rong giira nha cung cap dich vp va khach hang co thé su dqng nhiéu cong nghé

khac nhan. Nha cung cap dich vi.i vie’n thong sir dung cong nghe DSL phuc vii cho thue’

bao khach hang. Nha cung cap dich vij cung bat dari su dung cong ngh)e qiiang nhu PON

de’ ke't not dén khach hang. Mang IPTV sir dung duong truyén ADSL va VDSL de’ cung

cap bang thong dam bao cho hoat d(ong ciia dich vi.i IPTV den thue’ bao. Nha cung cap

dich vu se thay the thiet bi (nhu DSL modem) tai thué bao de phan phat két rio Ethernet

dén mang cua khach hang.

1.1.2.4 Mang tai thué ban

Mang tai thué bao cung cap dich vu IPTV dén khach hang. Co rat nhiéu loai mang

tai thué bao khac nhau nhung dich vu IPTV yéu cau bang thong cao tai mang cua thué

bao. Diém cuo’ii trong mang cfia thue’ bao in:i TV duopc ke’t noi den la set top box.

1.1.2.5 Middlewave

Thu at ngu IPTV Middleware dwc!c dung dé mo tit cac goi phan we’re lién quan de’n

viéc phan phat dich vp IPTV. Co rat nhiéu nha san xuat thuc thi goi phan mem my, moi

nha san xuat céi cach tiep cén riéng doi voi IPTV. Middleware do nha cung cap dich vp

su dqng co thé anh hufing dén kién trfic cua mang IPTV. Middleware co kien triic

client/server dién hinh, trong do client mm o set top box. Middleware dinh nghia cach

khach hang su dung (nhu EPG — Electronic Program Guige, VoD hay PPV) dirpc thirc

h ten va diéu khién thong qua M iddleware. Tinh de dang trong qu:in ly nhiéii dich vii la

mot chuc nang cua mang IP hat chieu. Kien triic IP my cung cap tiéii chum cho cac ting

dung va dich vu duoc tich hop vao trong mang, IPTV chi la mot dich vu trong cac uiig

dung my. Nhan to phan biét trong mo hinh dich vu IP la tinh hoi tu. Boi vi cau trfic

chung cho cac Eng dung va dich vu, tinh hoi tu co the duoc hién thuc hoa cho cac thénh

phan mang, ung dung, hé thong ho tro hoat dong. Vi vay quan ly da dich vu tro thanh bai

to an quan ly cung cac dich vu qua mang va phan bo chung den nhiéu moi truong nguoi

dung dau cuoi khac nhau.

1.1.3 in nhupc diém ciia IPTV so viii c:ie d;ich vq truyen hinh kh:ie

1.1.3.1 Uu dure

Hé thong IPTV dua trén IP nén co nhimg uu diém dang ké, bao gore kha nang tich

hop truyén hinh v‹›i c:ic dich vii IP kh:ic nhu truy nh(ap internet toc do cao vii VoIP. Mang

IP cung cho phe'p truyén nh ten thong tin hon vii voi nhiéu chtrc nang hon. Trong mang v)e

tinh hay tniyén hinh truye’n thong, sir dung cong nghe broadcast thi tiit ca n(or dung dupc

truyén I ten tiic den moi thué bao, thué bao chuyén kénh tai set top box. Thué bao co the’

lua chon tu nhiéu lua chon nhu ‘n t vé tinh, cup, truyen thong dé dna luong thong tin

vé nh:i. Mang IP lain viéc khac, rio dung duoc gin o trén mang va chi nhung noi dung

khach h:ing lua chon I:i duoc gin dén nh:i thué bao. Diéu n:iy sé tiét kiém bang thong va

su lua chon cua kh:ich hang it bi gioi han bcii “dudng ong” dan dén nh:i thué bao. Diéu

my cung co nghia la tinh riéng tu cua kh:ich hang duoc dam bao hon so voi hé thong ve

tinh va truyén hinh truyén thong.

Tinh tuong tac

He thong IPTV cho phép nguoi xem co cc hoi dé xem cac chuong trinh TV so

tinh tuong tac hon va cii nhan hon. Vi dii nha cung cap d]ch vu co thé cung cap chirc

nang tuong tac cho phe’p nguoi xem lua chon noi dung xem theo tén phim hay tén sha

dun vién hay chuc nang picture in picture cho phép ngucii xem co thé chuyén kénh ma

khong ph:ii ni be› chuong trinh ho dang xem. Ngu‹›i xem co céi the truy nh(ap viio album

anh va kho nhac trén PC cii a ho tir man hinh TV, sir dung dren thoai de d)at lich ghi lai

cac chuong trinh TV yen thich. Ngoiii ra hp co céi the sir dung chic nang gi:inn s:it d iéu

kh ién (parent control) de cain con car xem mot

hop.

truyen hinh khong phu

VoDVoD cho phép khach hang duyét mot chuong trinh truc tuyén hoac mot danh such

ciic bo phim dé xem qua va sau do lua chon chung. Vé mat ky thuat, khi khiich hang ma

chon mot bo phim, thi mot ket noi point-to-point duoc thiét lap giua bo giai ma cua

khach hang (Set top box hoac PC) va server phan phat luong noi dung. Bao hiéu vé cac

chirc nang nhu pause, backward/forward. . . dupc dam bao bcii giao thirc RTSP. Dang ma

hoa chung nhat dupc su dung cho VoD la MPEG-2, MPEG-4 va VC- 1. Dé tranh hién

tuong an cap ban quyén n)oi dung phim thi n)oi dung cua VoD thc›i duoc ma hoa. Voi

song nghé IPTV vies ma hoa dupc thuc hién hiéu qua thong qua he thong DRM. Voi hé

thong nity néii kh:ich hang lua chpn xem phim trong then gian 24 gici thi sau 24 gici no i

dung phim ’khon the xem dupc ntra.

Mot uu diém khiic ciia mang IP la khii nding tich hop va hoi tu. Cac dich vu hoi tu

o day noi dén khii nang tuong tiic cua ciic dich vu hién co theo cach trong suot dé tao ra

ciic dich vu gia tang moi. Vi du la dich vu On-Screen Caller ID, nhan Caller IP trén man

hinh TV va khii nang xu 1y (gin den voice mail. . .). Cac dich vu dna trén IP se cung cap

kha nang cho khach hang co the truy nhap o bat ky dau, bat ky khi mo den noi dung

thong qua TV, PC hay dién thoai cua khach hang, va kha nang tich hop cac dich vp va

rio dung dé gan chat chung voi nhau.

1.1.3.2 Nhu’pc diém

Nhuoc die’m chinh cua IPTV chinh lit kha nang mat du lieu rat cao va su sham tre

truye’n tin hieu. Ne’u nhu duong ket noi mang cua nguoi dung khong that sq tot cung nhu

khong du bang thong cm thiét thi khi xem chuong trinh se rat dé bi giat hay viéc chuyén

kénh co thé ton kha nhiéu thoi gian de tai vé. Thém vao nira néu way chit cua nha cung

cap dich vu khong dii manh thi khi so luong nguoi xem truy cap vao dong thi chat luong

dich vu se bi giam sut. Ngoai ra, cac nha cung cap dich vu IPTV cling gap nhiéu kho

khan trong viec dam phan hpp dong voi c:ic nhii cung cap dich vu not dung dan de'n tinh

trang nghe’o nan thong tin trén cac ke’nh IPTV. Nhiéu cong ty vien thong dang tan dung

cc so ha tang san céi de phan phoi IPTV, nhung bai to:in dat ra la trim sao dé d:ip ting du

nhu cau vé bring rong. Mot van de khac la nha cung cap dich vu kho co the thu duoc loi

nhuan tin quang cao vi nguoi xem co thé tua nhanh hoac law bat cm thao tiic mo dé khong

phai ton thoi gian xem nhung doan ma ho khong thich

1.2 Céc thanh phan cc ban cii a h)e thfing cung cap d'ich vq IPTV

1.2.1 C:ic thiinh phln thu °oc nha cung clip djch vq (SP — Service Provider)

1.2.1.1 He: th‹›ng Video Headend

Thu, diéu che' va gi:ii ma not dung hinh anh va am thanh tir cac ngiion kh:ic nhau

vii st dung c:ic th iet bi ma héia dé chuye’n doi not dung my thanh cac luong IP multicast ci

khuon dang ma hoa mong muo. Yéu can phai co thiét bi dau cuoi cho viec ph:it not dung

quang ba. Thiet bi dau cuoi my co kha nang ma hoa mot chuoi cac hinh anh theo then

gian thuc bang ky thuat nén dung MPEG-4 Part 10 hoac H.264. Hinh anh ma hoa co thé

lay tu vé tinh, truyén hinh cup, hé thong truyén hinh mat dat, retry chin video, tape

playout, v.v... Sau khi ma hon, cac chuo (dinh dang ASI, SPTS) truyén MPEG se duoc

dong géii bang cach su dung IP Streamer. Sau do se truyén nhirng chuoi got IP bang cach

su dung giao thuc UDP/IP. Dau vao cua hé thong Video Headend la cac chuong trinh

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truyén hinh quang ba, cac kénh truyen hinh mua ban quyén thu tu vé tinh, cac kénh

truyén hinh cap, c:ic phim tu cac nguon khac nhu tu s:in xuat, tir cac thiet bi VCD/DVD

player, v.v.

1.2.1.2 HQ th‹›ng lVliddtewave

Cung cap kha nang quan ly thué bao, n)oi dung va bao cao hoan chinh citng véii cac

chic nang quén 1y EPG va STB, dong thoi van diiy tri tinh mo cho viéc tich hop cac d ich

trong tuong lai. Middleware la mot giao di)en cua he thong cung cap dich vii IPTV voi

nguoi sir dung, néi xac dinh danh tinh cho nguoi dung. Hién th i mot danh s:ich c:ic dich

viJ ma thué bao do co the’ su dung va tro gnp 1¿a chon dich vu my sau khi da xac thirc

danh tinh cua nguoi dung. Middleware Inn lai mot tiéu su cho tat ca cac dich vu.

Middleware dam bao cac hoat dong bén trong ciia dich vu truyén hinh mot cach hoan

hao. Middleware se’ khong gioi han bat ky hoat dong riéng re mo trong he thong, nhung

se’ giao tie’p truc tiép voi moi th:inh phan dupc hé thong ho tro. Middleware ho tro API

cho phép mo rong cac chuc nang moi vii truyén du lieu giira cac hé thong.

1.2.1.3 HQ thcing phcin phéi nc› i dung

Bao gore cac chin way chu VoD va he thong quan 1y VoD tuong Eng, cho phe’p

luu trfr cac not dung da dupc ma héia va thiét lap ciic chinh sach phan phoi dung m)ot

such mém déo. Hé thong nity cung cho phép nha khai thac mo rong mot cach kinh Ie, phu

hpp voi tai va ye’u cau d]ch vii cua cac thué bao. May chu VoD se Inn noi dung th¿c va

cung cap cho thué bao khi no nhan duoc su xiic thuc danh tinh tu middleware. No cho

phép cac thué bao da I va x em nhung bo phim chat luong cao va chuong trinh theo yéu

cau (chuong trinh my duoc luu trén retry dich vu va truyén tai theo yéu cau). Hé thong

my cung cung cap nhung chiuc nang diéu khién VCR nhu tua di, tain dung, va tua lai.

1.2.1.4 He: thc›ng qaciii IQ b f étt zi (DRM)

DRM gnp nha khai thac b:to v)e not dung cua minh, nhu tron cac tin h i)eu truyen

hinh hay ma hoa noi dung VoD, khi truyén di trén mang Internet va tich hop voi tinh

nang an ninh tai set top box o phia thué bao. DRM dung dé biro mat noi dung cac khoa

giai ma ciia ciic thué bao. Nhitng noi dung duoc tai trén nhiung may chin noi dung se duoc

ma hoa truoc bang hé thong DRM va no cung cung chi ma hoa rio dung quang ba dé bao

mat su phan bo den STB. Hé thong co kha nang ho tro chuc n g ma hoa trong cac

headend tuong ung va cung cap khoa mat ma cho cac headend my. He thong DRM chua

khoa cho phan rio dung cua mpt cc sci dir lieu khoa dong thoi bi mat phan phoi cc so dir

lieu my Hi STB. Hé thong DRM cfing se ho tro thém vao phan noi dung cac chirc nang

thu thii(at trong kh i xem (tua nhanh, tua lai, v.v...). He thong DRM se’ d¿a tre’n c:ic khai

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niém ciia hé thong cc sci ha tang kho:i cong cong (PKI). PKI dung cac the ky thuat so

X.509 de’ x:ic nhiin moi thiinh to trong h )e thong DRM dong tho de’ ma ho:i an to an dtr

trén co dung c:ic kho:i chiing/rién g.

1.2.2 C:ic thiinh phln thu °oc nha mang (NP — Network Provider)

Bo ghép kénh truy nhap dudng day thué bao so (DSLAM) co mot so modem DSL

nhan c:ic phién tu c:ic thué bao. Sau déi dna tat ca cac phién cung ra duong truc két noi toi

wang tong hop.

Hinh 1.2: DSLAM

DSLAM Ta in )ot trong c:ic bién dupc qii:in ly hoiin toan bcii nha cung cap mang

IPTV vi no dupc fun trir bén trong moi truong v)at ly an to tin, tirong ph:in voi set top box

va dau vao ho gia dinh, cac thué bao khong the truy nhap vat ly Hi DSLAM.

Hinh I .2 miéu ta cach DSLAM ho tro Internet toc d)o cao, VoIP va IPTV VLAN

téii cac thué bao. Thiet bi tai gia dinh se chia fun luong va cho phép VLAN duoc két thuc

(no cung céi the duoc ket thuc tai DSLAM). Cac DSLAM méii co the két hop tat ca cac

phie’n vao mot tin hieu va die’u khién chung qua TCP/IP (hoac cac giao thirc khiic) Hi

mang truyén I:ii. Trong mot so kiéu DSLAM so cac lua chon mang luoi nhu cac chuc

nang IGMP proxy, kénh ao vii VLAN cfing nhu mot so irng dung TCP/IP ho tro van hanh

mang IPTV. DSLAM sir dung ciic pho tan so thap cho am thanh va phan bo ciic tan so

cao cho truyén dan du lieu. Bang cach my ca am thanh va du liéu co thé duoc quan ly

boi DSLAM.

DSLAM sir dung ca rio Ethernet (VLAN). Hoat d(ong bet viec danh dau cac géi i

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de'n voi mot VLAN-ID dat dren cho mot nhom. VLAN-ID dua trén 802. 1 Q vii dupc su

dung boi DSLAM dé dam bao qua trinh gin di. Dna vao bring chuyén tiép bén trong,

DSLAM ’ i c:ic got Ui cac cong truy nhap khac nhau, trio luon I:ich bi)et fun luong tir

cac VLAN kh:ic nhan. Mo ca no i :io thirc hién kiem tra doc lap fun luong. Lim luong

duéng ten den tir mot cong dac b i)et/PVC dupc g:in vao mot VLAN rie’ng. Cac go i nity

dupc gui to mot cong Ethernet rie’ng theo bang chuyén tiep trong DSLAM. Luu luong

duéng le’n tir cac set top box khac nhau dupc tap hop vao ciic VLAN chuye’n dung cho

ciic d|ch vp riéng.

Hinh 1.3 miéu ta car nhin chung vé DSLAM v:i cach cac VLAN két thuc tai

BRAS, head end hoac tai cac bo phan Internet. Mot vai DSLAM sé chia sé viéc truy nhap

vao mot VLAN don.

Hinh 1 .3 Mo t:i chung ve DSLAM VLAN

Set top box yéu cau dia chi IP dé gia nhap vao mang. cau hinh ciia chung dwac

gum ly su dqng giao thirc DHCP. DHCP cling sé duoc ho trp boi cac ky thuat nhan thuc

cho phép diéu khién boi middleware va cac ung dung thuong mai trén cac loai hinh truy

c)ap cung cap cho cac thue’ bao.

Cac DSLAM co mot DHCP chuyén tie’p che’n vao d]nh danh du’ong day vat ly (lua

chon 82 trén DHCP) trén dia chi yéu cau. Die’u my dam bao cac ban tin dén ID set top

box dooc lién ket mo I vi trI vat ly riéng, giihn cac nguy cc lua dao va gian lan. Quit trinh

tinh toan va nhén thuc dna vao lua chon 82 dé xac nhan nguoi su dung va su dung dich

vu RADIUS, co thé yéu cau cac ung dung thuong mai kiéu truy nhap nén duoc cap cho

thué bao. Ciic DSLAM cung co thé su dung IEEE 802. lX nhan thuc, su dung RADIUS

dé ho tro qua trinh nhan thuc mang. Su dung giao thuc nhan thuc mo rong giua set top

box va cac may chit nhan thuc. May chu DHCP se cho way chu middleware cho phép

dia chi IP duoc gan vao set top box.

Hinh 1.4 mie’u ta qua trinh nhan thuc set top box, bat dau voi yéu cau DHCP dna

ra boi set top box vii dupc chuye’n di boi DSLAM va cac router Hi may chu DHCP. Yéu

cau bao dufing vat 1y cua yéu cau DHCP. Miiy chin DHCP hum tra voi ciic

thanh phan khac nhu RADIUS hoac way chu middleware néu duong vat ly va thué bao

9

nhan mot dia chi IP hop lé, va nhan dooc su xac nhan, truy nhap duoc chap nhén. Ciic

DSLAM thaw gia vao qu:i trinh multicast bang c:ich cung cap cac chuc nang proxy hoac

snooping cho cac yen cm IGMP. Luu luong IGMP dudng ten sé danh dau VLAN de’

dam b:to t:ich b iét Init luong tai wang tong hop. C:ic b:in tin IGMP dupc tim bc›i c:ic cm

’ i de’ to mi cay phan phoi multicast. Luong video se’ dirpc nhan doi t‹› c:ic cong th ich

hpp theo cac yéu cau gia nhap IGMP dupc nhan boi DSLAM tir cac set top box. Cac

luong video dupc ma hoa, ne’n cac set top box se ye’u cau cac chla khoa DRM cung nhu

nhan thuc de’ gia nhap mie’n IGMP riéng.

Hinh 1.4: Nhan thuc set top box

Dé chong lai lira dao v:i tang cuong ma h‹ia, DSLAM se kiém tra c:ic dia chi IP

nguon cua moi thué bao cho moi yéu cau doi voi danh sach c:ic hop dong thué bao. Anh

xa c:ic dia chi IP véri cong vat ly tuong mug duoc luu trong DSLAM. Dia chi IP nguon

ciia Ie’n di vao DSLAM qua cong thué bao dupc kie’m tra trong b:ing.

DSLAM cling cung cap c:ic bao c:to trang thai thue’ bao. Tat c:i c:ic yen cau tir cac set top

box den dupc gh i lai. Hinh I .5 in ten t:i kie'n truc multicast

1

1.2.2.2 RouterHinh 1.5: Kien truc multicast — su thaw gia ciia DSLAM

Router két hop voi nhau tao thanh ciic mang cua Internet. Var tro chinh cua chiing

la truyén c:ic goi tir mot tap c:ic lién két dau vao téri mot t:ip cac lien ket dau ra, chiing

cung céi quan he voi c:ic cong nghé lien két khong dong nhat, cung cap danh muc ho trp

cho dich vi.i kh:ic nhau. Router co ta mpi cap trong Internet. Router trong wang truy n http

cho ho gia dinh va nha kinh doanh nho ket noi Hi nh:i cung cup dich vu. (ISP). Router

trong mang doanh nghiép lién ket 10 in:iy tinh vao mot khu. Router trong du’ong tin.c

thuong khong truy nhap truc tiep Hi hé thong cuoi. Thay vao do, chiing lién két cac ISP

va cac mang doanh nghiep voi dci:eg tin.c long cach xa. Su lori le’n nhanh chong cfia

Internet da tao ra c:ic yéu cau khac nhau cho router trong cac mang truy nh:ip, doanh

nghiép, dufing truc. Duéng truc yéu cau router kha ‘ g dinh tuyén

trén két. Cac router doanh ngh iep nén céi gia thanh thap, nhiéii cong, de' dung can hinh,

va ho tro QoS. Cuo cung, router truy nhap phai ho tro c:ic cong toc do cao, c:ic giao

thtrc kh:ic nhau ta moi cong.

Router co bon thanh phan chinh: cong vao, cong ra, cc cau chuyén mach, va xir ly

‘ vao lién

dén. Co cau chuyén mach lién két cac cong dau vao voi cac cong dau ra. Phan loai router

la hang dci dau vao hay hang dci dau ra phu thuoc vao quan hé toc do cua cac cong dau

vao va cc cau chuyén mach. Neu cc cau chuyén mach céi bang thong ton hon tong bang

thong ciia cac cong dau vao, thi cac got chi dci o dau ra, duoc gpi la router hang dci dau

ra. Mat khac, cac hang dci céi thé xay dung tai dau vao, duoc goi la router hang dci dau

vao. Cong dau ra chua sirs goi vii d¿ dinh chung cho d]ch vu tai lie’n ke’t dau ra. Cuoi

MPEG-2/4 Dni er

Tluct bi ngoai i (U SB. IR) TCP/1P v a lién kct

1

cung, xu ly dinh tuyén thaw gia v:to ciic giao thiuc dinh tuyén va tao mot bang dinh tuyén

de’ chuyén got.

1.2.3 C:ic thiinh phln thu °oc kh:ich hang (Client)

1.2.3.1 Set top box

Set top box duoc su dung dé ket rio IPTV headend voi TV. Chuc nang chinh ciia

bo phan my la hiéu va chuyén doi cac yéu cau tir cac thué bao sau do gut cac ban tin toi

headend, cac dich vu va cac not dung yeu cau riéng. Set top box se nhan cac not dung da

dupc ma hoa va giai ma chung. Hinh 1 .6 mie’u ta kien truc IP set top box. Cac thanh phan

ciia set top box bao gore:

Truth diiv (:1 \Veb

Middleware Client Thu Video Giai rna Do song/Thu v ideo

Hi diem tinh v a dieu kliie‘ii tluet bi

Hinh 1.6: Kien tnic IP set top box dién hinh

H9 dun hanh lhéi gian iliqc

Cac set top box huong Hi bo vi xir ly gi:i re. Bo nho va kha nang xir ly bi giéri han

so véri ciic PC chuén. C:ic nh:i san xu:it hu6ng Hi viéc lua chon cac CPU cc so dé: cung

cap dv kha nang xu ly cac chiuc nang cc ban v:i tuong rong véri so lan dap irng.

b, HQ thcrng Iéi

Phim cirng Hi bao gore c:ic thiinh phan dren tu kh:ic nhan ho tro cho set top box

van hanh, thong tin trao do i giira sirs thanh ph:in, bo nho va khii nang quan trong nhat ciia

mot vi mach chuyén dung la dé Inn trir DRM v:i khéa PKI dupc yéu cau cho truy nhap va

nhan thuc. Voi viéc sir dung vi mach chuyén dung dé luu trir khoa, cac de doa ve viéc

truy nh:ip trai phép gum di, trai ngiroc voi giai phap dna trén phan mém luu trii tat ca cac

th:inh phan an ninh trén dia cimg hoac ROM.

Co mot so th iét bi ngoai vi két rio toi set top box, bao gore day c:ip, dan ra video,

thiinh phan hong ngoai cho die’u kh ten tir xa hoac bun phim, USB hoac c:ic ky thuiit luu

trii.

d, DRM vé h thcrng tray nh p dién ki n

Set top box yéu cau mot thanh ph:in chuyén dung de phan phoi véri cac chirc nang

lién quan DRM. No c:in thiet de c:ip nhat va yéu cau khoa DRM, ma hoa noi dung va

cung cap luong ma hoa Hi cac bo ph:in kh:ic. Set top box can tit nhan thuc dna v:to hé

thong truy nh:ip diéu kién dé cho phép truy nhap noi dung. Nha cung cap dich vu IPTV

cm dam bao tuong thich cac ting dung CAS va DRM duoc dat trén set top box. Yéu c:iu

dac trirng my gay kho khan cho mot thi triréng méi vé c:ic dich vp IPTV. Néi khong giong

nhu viec ciic thue’ bao chuyén doi ciic nha cung sap dich vu IPTV ma khong can thay doi

set top box. Ngoai ra, no khong giong nhu I:ip hpp noi dung so the’ hoat dong trong thi

truéing ma cac not dung dna ra tir so luong lori nh:i cung cap rio dung hoac cung cap dich

vu IPTV, do moi nh:i cung cap dich vu co thé co hé thong DRM khiic nhau. Theo thoi

gian, cac chub se dooc phiit trién dé dam bao tuong két giira c:ic he thong CAS va

DRM. Trong khi dci, ciic thué bao se duoc lién két dén nha cung cap dich vu cua chinh

ho.

e, IVIPEC•-2 vé IVIPEC•-4

Set top box cén co MPEG-2, MPEG-4 néii chung la c:ic trinh die’u kh ten ma hoa-

gi:ii ma dé cho phép ma héia luong du I i)eu va cung cap dari ra de hién thi tre’n TV. Nha

cung cap dich vu can dam bao tuong thich ciic bo ma hoa-giai ina deac bat vao set top

box. Ciic bo ma hoa-giai ma duoc sir dung trén headend cén duoc nap vao set top box.

j He: diéri hciiih vé trinh diéri khlén hc: diéri hciiih

Cac he diéu hiinh nhe dupc su dung cho set top box. Mot so hé diéii hanh d)oc

quyén vii nguon mo dupc sir dung cho chirc nang my. Mot uu diem cua c:ic he die’u hanh

my la tinh mem de’o dna ra dé phat trie’n set top box cc ban, vi chung ho tro trinh duyet

cung nhu thu dién tu, tin nhan tuc thoi va ho tro mang. Can sao che’p ban goc cua dupc

cau hlnh chinh x:ic, ap ding cac ban va loi va biet chac chan kh:i nang b i tan cong truoc

khi dna set top box Hi ciic thué bao. Ngoiii ra, tat ca cac cong khong can thiét san dupc

khoa lai.

g, Middleware khéch hciiig

M)ot kh:ich hang trén lac voi in:iy chu in iddleware. Kh:ich hung n:iy co the sir dung

trinh duyet web de trao doi thong tin v‹›i in:iy chu in idd few are cling nhir t:ii ve EPG de

h ten th i véii thué bao. Middleware kh:ich hung co the bao

mot so trucing hop

nang DRM trong

Chuc nang my se nhan luong ra tu chiuc nang DRM va se giai ma du liéu MPEG-

4 thanh dang su dung duoc. No co thé gun ma du liéu thanh NTSC/PAL dau ra

i, Trinh dtiy t web

C:ic in:iy chu in idd lewave hudng t‹› viec v(an hiinh nhu c:ic d |ch vi.i web. M)ot so

ciii d*at se’ cung sap tiit cii ciic truy nhap sir dung SSL (HTTPS, cong 443). Trinh duyet

web dupc sir dung boi set top box dé truy nhap cac noi dung va hie’n thi thong tin cho cac

thue’ bao. Mot so set top box cung cho phe’p sq tuong tits giira thue’ bao voi set top box va

cho phép trinh duyet web Internet dat bcri thué bao.

Nha cung cap set top box co thé car san mot thu dién tu dé cho phép thué bao gui

va nhan cac ban tin. Ung dung my bao gore chuong trinh doc c:ic tap tin cc ban nhu cac

ho so, bang tinh va thuyet trinh.

Hinh 1.7 mo ta set top box xir ly liiu luong, bat daa voi viec yéu cau IP va nhan

noi dung, cac chuc nang trinh duyét web, tuong tac middleware va giai ‘rio dung, sau

do dén c:ic luong ma hoa v:i giai ma cho NTSC/PAL hoac ciic chuén thich hop va cuoi

cung cung cap dan ra cho TV.

13

ithin Trinh du› e’t Web gui i e’u canMiddlevi are

Mn lioa Video clio NTSC ho‹c PAE

Middles› are client cung cap dirliéu t6i Middlevi are serv er

•• • Gut tot TV

Hi nh 1 .7: Qua trlnh xfi 1y cc ban cua set top box

1.2.3.2 2 Cong giao thiép thué bao (Res idential Gateway — RG)

Cong giao tiep thué bao o giira mang truy nh(ap bang rong IP va mang trong nha

cho phe'p cac thiét b i so trong nha chia se mot ke't no i IP don. Ngoai cac ung dung truy

nhap Internet toc d)o cao, RG cung co kha nang dinh tuye'n thong in inh dich vij IPTV ter

thie't bi ' cii the.

RG thé hé thru ba co khii nang ho tro nhiéu cong nghé mang trong nha va bring

rong. Phan cung dupc thiet ké theo kiéu modul. Ho tro modul céi nghia la cac RG bat dau

phat trién thanh mot kieu way chit ung dung, thué bao su dung dé phan phoi cac dich vp

VoIP, IPTV va bang rong vao nha cua ho. Tir goc do nha cung cap dich vp IPTV, RG la

mot ky thuat quan trong. Chung cho phép nha dieu khién mang giéii thiéu cac san pham

mang trong nh:i, phan biet cac d]ch vii ciia ho voi d]ch vii ciia dcii thu canh tranh. Mot RG

san so hé thong phén mém v:i phan cirng tin cay dé die’u ti$t phan phoi cac d]ch vu dam

bao va tuong thich. RG thuong két hop chuc nang cua modem, router, hub dé truy nhap

ciic dich vu IPTV. Co nhiéu kieu RG kha dung khac nhau dna trén yéu cau ve chuc nang

RG

khong phu thuoc vao PC dé hoat dong. Chirc nang dinh tuyén

duoc cap két rio lip 3 giira dia chi IP ca nhan duoc gan cho

IPTVCD két trong nha va mang truy nhap bang rong.

' tro dé

cung ‘i téii

mang

Khi mang bang rong ph:it trién lién tuc, RG cung ph:it trién cac chirc nang ciia no.

Tuy nhién, vé cc ban no bao gore va ket hop ba th:inh phan ky thu:it riéng biét

(I) Mot modem so

(3) Phan mém thich hop

Nhie’u cau hinh linh hoat dupc dna de’n bcri mot RG ho trp ciic kiéu modem khac

nhau. Ciic modem my cung cap két noi Hi cac kie’u mang truy nhap bang rong:

( I ) Truyén hinh vé tinh truc tiép

(2) C:ic he thong Wi-fi, Wireless va WiMax

(3) Mang truyén hinh cup quang lai hai chiéu

1

(4) He’ thong DSL, ADSL, VDSL

(5) Cac mang quang téii nha (FTTH)

Hau hét cac RG de’u co in)ot cong diéu khién cho phép sua chua RG ne’u co van d’é

phat sinh.

1.3 Céc d'ich vq IPTV en ban

IPTV khong chi don thuén la IP video. Tre’n thirc te’, cms nh:i khai th:ic vien thong dang I:ip trung v:to dich vu my de ieo ra su khac biét cua dich vu ho cung cap voi cac dich vu ma cac nha khai th:ic mang truyén hinh cap hay vé tinh cung cap. Tat c:i c:ic lua chon c:iu truc va cong nghé cc sér tap trung vao viec phan phoi nhiéu loai dich vu video theo yéu cau v:i video quang ba, nhung véii kinh nghiém vé c:ic dich vu thoai va so liéu toc dp cao cho phép c:ic nhii khai th:ic vien thong cung cap cho kh:ich hung c:ic dich vii tich hpp bo xung la mot phim ciia got dich vi.i IPTV ton.

Live TV

• Digital TV

• Prem trim TV

• Pay-per-view

• Near video-on-demand

• Program guide

Entertainment

• Gaming

• Gambling

• Karaoke

• Internet TV

Stored TV

• Video on demand

• Subscription VoD

• Time-dhifting PRV

• Network PVR

Commerce

• Telecomerce

• Targeted/interactive advesting

Commiinictaion

• Residental VoIP portal

• SMS/MMS mesaging

• Instant messaging

• Mobile services portal

• Video conferencing

• Emergency alert system

ASP

• Distance learning

• Home automation portal

• Converged services

• Hospitality

dich vu IPTV

1

C:ic dich vii ch inh thuong dupc trién khai tnroc lit dich vu video theo ye’u can va video quang ba, tuy nhién cac nha khai th:ic vién thong déu co ké hoach bo xung cac dich vu my voi cac dich vp tro choi, quang cao, :im thanh, thong tin. . . Diéu cén biét la dinh nghia va pham vi cua ciic dich vu my se lien tuc duoc tién trién theo thoi gian.

mo ta tong quan cac loai d|ch vij IPTV kh:ic nhau hién dang dupc d¿ kie'n vii trién khai

Cac dich vu IPTV video co thé phan thanh hai nhom: phiit quang ba va phiit theo yéu cau.

a) Céc d[ch vri video qriéiig bé

Ve’ cc bun, ciic dich vu video quang bit khong kh:is gi so voi ciic d ich vu. video ma

ciic nha khai th:is truyén hinh cap, ve tinh, mat dat cung cap ngay nay. Diéu my gop ph:in

tao thanh tiéu chuan doi voi dich vu TV, khong ké dén cac cc ché truyen tai: lai cap

dong/quang, DSL hay FTTx. . . Cac kénh video quang ba bao gore c:ic kénh truyén hinh

quoc gia, dia phuong v:i c:ic kénh tra tien (nhu HBO).

So c:ic ke’nh qu:ing b:i khu virc co the thay doi theo th i tnrdng, c:ic kénh n:iy

thuong ho trp cac phién ban theo khu virc ciia c:ic wang goc (ABC, CBS, NBC vii Fox..).

Mot so trong ciic kénh quiing ba cé dinh dang do trung thuc cao (HD), diéu dé co

nghia cac nha khai thac vien thong co thé cung cap cho kh:ich héng ca hai loai kénh

quang ba tiéu chuén (SD) va do trung thuc cao (HD). Mot phan rio dung quang ba co thé

duoc luu lai trong mang va sir dung sau do.

6) Céc d[ch vri video fire trii

Cms dich vii video luu trit co nhiéu dang va lii nén tang dé phén biet voi cms n)oi

dung video khac dupc truye’n tai qua ciic mang IP. Noi dung video Inn trir d:ip Eng dupc

nhiéu cac so thich khac nhau cua nguoi xem. Tiiy theo vi tri luu trii, khiich h:ing co the

tan dqng duoc cac uu diém ciia noi dung video fun tai thiet bi khach h:ing hoac mang de

diéu kh ten mot c:ic linh hoat kh i sir dung dich vii nhir: tiia nhanh, tiia ngupc, tain dimg.

nhu kh i hp sir dung VCDs/DVDs. Noi dung video liru trir lit d)ong l¿c chinh thuc day sq

ph:it trién phan we’re 1dp dich vu trong c:ic wang IPTV cung nhu c:ic tiiy chpn ciia set-top

box. Cac tiiy chon not dung video lirii trir bao gore:

• VoD luu tru cuc b)o: Noi dung dupc xem 1:i pho bién rong rai se dwc!c phat quang

bit Hi CPE qua mang IP va Inn cuc b)o dé khach hang céi thé xem theo yéu cau .

Chrrang I. Giéi thi u ch eng vé IPTV

Cac noi dung my thuong gan voi quit trinh xac thuc quyén su dung khi xem doi

voi tirng thué bao.

• VoD luu trén mang: VoD luu trén mang danh cho cac rio dung duoc cor I:i khong

pho bién cho nhiéu thué bao tai cung thoi diém. Khach h:ing co thé yéu cau xem

noi dung ngay lap tuc va/hoac sau khi yéu cau. Noi dung c‹i thé xem ngay duoc

truyén Hi duoi dang unicast trén mang IP, trong khi noi sung xem sau yeu cau

dv pc t(ap hop theo nhém cac thué bao va cé the’ truyén tai dang broadcast hay

narrowcast dna trén thir tu tirong duong d i véi ciic thué bao khiic. Diéu my se’

cho phép nha cung cap dich vu su dung toi uu c:ic tai nguyén mang mo I c:ich linh

hoat.

• VoD thué bao: VoD thué bao la bién thé ciia hat d ich vu trén, cho phép kh:is hang

quyén xem mot so rio dung duoc da duoc cho phép trucrc do trong mot hoang

thoi gian xac dinh, tan dung uu diém cua ca hat not dung vdeo luuw trén mang va

cuc bo.

• Ghi lai noi dung video theo yéu cau c:i nhan: PVR (Personal Video Recorder) cho

phép ngu‹ii dung quyén ghi lai ciic chuong trinh quang bit/theo yéu c:iu dé xem lai

sau dé. C:ic quyen xem noi dung thay doi tiiy theo viéc su dung mot lén, nhiéu l:in

hay khong gioi han not dung v:i phan mém qu:in ly ban quyen (DRM) lit yéii to

quan trong trong c:ic triréng hop n:iy de kie’m so:it qu:i trinh chi a s’e not dung giiia

cac thie’t b i trong nh:i thué bao.

• Ghi lai not dung video va lmi trén wang (Network-based PVR): tirong tu nhu

dich vu PVR, su kh:ic nhau chu yeu la vi tri luu noi dung, trong truong hop my la

trén mang, thay vi st dung thie't bi cua kh:ich hung. Dich vu my cho phép cac

thué bao voi set-top box don gi:in tan dung dupc cac irii diém cua cac d|ch vii

video lmi trii vii cho phép cac nha cung cap dich vu trip hop c:ic n(or dung luu trir

trong mang mot such Hi uu nho dc› gi:inn chi phi so voi viec thué bao ph:ii su

dung set-top box phtrc tap. D|ich vu. my cung cung cap m)ot ciich tot cho thué

bao kha nang linh hoat trong viec lua chon chuong trinh vi mang cé kha nang liiu

i dun hon soa voi set-top box ciia khach hang.

Cac dich vp IPTV audio

Néu chi co dich vu IPTV audio thi chac chan khong dii kich thich cac thué bao

chuyén nha cung cap dich vu va cung khong dii dé nha cung c:ip dich vu dau tit mot

luong lén tién vao ha tang mang dé ph:in phoi dich vu IPTV. Tuy nhién, khi két hop véri

ciic tuy chon khac no se nang cao tinh hap dan ciia goi dich vu tong thé.

1

a) D]ch vri radio broadcast

Dich vu my cho phép khach h g do tim bat dai phat mo trén thé gioi va nghe

qua loi ra am thanh ciia TV hay hé thong loa kém theo.

6) D[ch vri music broadcast

theo quan diém dich vu am thanh, dich vu my rat giong uqangr bit vido cc bun,

nghia la nguoi dung co thé su dung nhiéu kénh am nhac khiic nhau. Dich vu my da kha

pho bién va duoc cung cap boi nhiéu nha cung cap dich vu cap/MSO. Dich vu am nhac

my thufing di kém voi thong tin do hoa vé noi dung nhac hien thi trén TV cua khach

hang. Huong dan chuong trinh chon kénh cung tuong tu nhu doi voi cac kénh video.

c) !VIiisic on demand

Tuong tir nhu VoD, quyén yéu cau va nghe tuong tp nhu doi voi cac dich vu VoD.

Moi quan he giira cac nha cung cap rio dung va phuong tién la yeu to quan trpng nhu doi

voi dich vu VoD de dam bao co duoc thu vién ton cac file nhac.

d) Music s ubscription service

Cho phép thué bao fun tru va sap xep theo so thich ciia minh.

Dich vii am nhac theo yen ca se dupc truyén t;ii qua mang IP theo cach tuong tu

nhu c:ic dich vii VoD sir dung cac cc can broadcast hay unicast, theo then gian v:i mdc d)o

tuong duong voi c:ic thué bao kh:ic.

Cac dich vp IPTV gaming

Choi game (mot nguoi hay nhiéu nguoi cung liic) trén truye’n hinh la d]ch vu riéng

biet ma cms nha khai thuc vie’n thong dang xiic tién tich hop vao cms géi dich vu IPTV ciia

ho. Se cé nhie’u loai cho troi cho nhie’u loai doi tuong khac nhau cung nhu cung nhu ciic

tro choi cho I nguoi va nhie’u nguoi choi cung liic. Khiich hang cé the’ lua chon nguoi

choi cung cung nhu lén ke hoach th‹ii gian choi véri nguoi khac.

C:ic dich vu thong tin tich hop

Dich vu thong tin IPTV tich hpp la linh c trong déi c:ic nhii khai thac vien thong

co uu the hon so voi ciic nha cung cap da dich vu/truyén hinh cup. Ciic dich vu thong tin

tich hop se tan dung ciic lot thé vé tai nguyén ciia cac nha nha cung cap dich vu vién

thong khi cung cap cac dich vp thoai va truy cap Internet toc d)o cao. Cac vi du vé dich vp

thoai va Internet tich hpp dupc mo ta nhu sau:

a) D[ch vri thoci tich hpp

Dich vii thoai tich hop cho phe’p ciic thué bao sir dpng TV ciia ho mo r(ong ciic

chirc nang dich vu thoai di dong v:i co dinh. Vi du:

2

• Dich vu. thong bao cuoc got de’n (Incoming Call Notification Service): Hie’n thi

biéu tupng trén TV, thong biro cho thué bao co cuoc gpi thoai/vdieo den. Ngoai ra

con ho trp cac chirc nang hién thi so thué bao va ghi lai cuoc gpi.

• Dich vu thong b:to ban tin (Message Notification Service): Hién thi bieu tuong

trén TV, thong biro cho thué bao co Hi nhan (voice mail) trong hop thu kém theo

dich vu thoai co dinh va/hoac di dong.

• Dich vu thiet lap ket rio (Connection Establishment Service): cho phép thué bao

gpi thoai/video tu TV ciia ho.

• Dich vu hoi nghi thoai/video (Voice/Video Conferencing Service): cho phép thué

bao thaw gia vii/hoac khoi tao hoi nghi thoai/video.

• Dich vp danh ba (Directory Service): Cung cap cho thué bao danh ba dién thoai

dién tir céi thé truy c:ip qua TV.

6) Céc d[ch !f I t et t?cfi hpp

Ciic dich vu. internet tich hop se’ cho phe’p su dung TV de’ sir ding cac Eng ding

Internet triioc day ph:ii sir dung bang retry tinh ca nhan. Ciic d|ch vu. n:iy khong nham dé

thay thé ciic irng dung Internet dna trén PC ma chiing cung cap ciic bién ph:ip thu:in tién

hon de tniy cap thong tin trong nhung khu vijc khiic nhan trong nh;i thué bao hay ci cac

thoi diem kh:ic nhau.

• Duyet web bang TV (TV web browsing): cho phép thué bao xem cac trang web

trén TV cua ho.

• Nhan tin bang TV (TV Instant Messaging): cho phép thué bao thong tin qua IM

trong khi dong th‹ii su dung cac dich vu video/audio hay gaming khac.

• TV Email: cho phép thue’ bao sir ding ciic Eng dung client trén TV dé dpc, gin v:i

nhan thu dién tu.

• Telecommerce Service: tuong tu nhu cac dich vu e-commerce, cac dich vu n:iy

duoc thiét ké dé cho phép thué bao sir dung TV cua minh dé tim kiém va dat mua

h:ing.

Cac dich vii quang c:to

Ho trp cms quiing ciio quang bit truyén thong v:i xen vao cung voi quang bit cuc b (o

tai c:ic diém khac nhau trong mang IPTV. Kha nang tuong quan giira cac set-top box va

cac mirc uu tien dich vp cho phép nha cung cap dich vu dna ra cac dich vu quang cao co

huéng doi tirong.

2

Chrrang I. Giéi thi u ch eng vé IPTV

Viéc tich hop cac dich vu quang c:to huérng vao doi tuong sir dung voi ciic dich vu

mua bun tit xa cho phép nhii cung cap dich co the’ giiip khach hung cua minh thuc hien

diipc nhirng thoa thu)an miia bun theo yen cau. Véii ban chat hat chiéu ciia mang thong tin

va cac dich vii ket hop, cac thué bao céi the cung cap y kién danh gia ciia minh doi v‹›i

gluing cao trén IPTV de lain cho dich vu quang cao nity sat voi doi tuong hon, phii hop

hon.

Tong ket chuong 1

Chuong n:iy gioi thieu tong quan vé hé thong cung sap dich vu. IPTV, uu nhuoc

diem cua hé thong my so voi cac hé thong truyén hinh khac. Mo ta cac thanh phan cc

ban cua hé thong IPTV: cac thanh phan thuoc nha cung cap, cac thanh phan thuoc nha

mang, cac thanh phan thuoc thué bao.

CHU’ONG 2: XAY DU’NG TIEU CHUAN

Tiéu chufln chit lirpng d;ich vq IPTV

Qua phan tich tinh hinh tiéu chuén hoa IPTV trén thé giéri, co thé thay hién nay co

nhiéu to chirc thaw gia viio qu:i trinh trén chiiiin hoa lien quan de'n IPTV. Hien nay dé

d:inh gi:i chat luong dich vu IPTV, c:ic nh:i cung cap dich vp se’ phim dira vao c:ic trén

chum dirpc tong hop tir nhiéu khiiyen ngh i v:i tiéu chiiiin ciia cac to chtrc tien chuén hoa

tre’n the' gioi.

Hién tai, ITU-T dang trong quit trinh soan thao hat tiéu chuan vé chat luong dich

vu IPTV v:i gum sat chat lupng dich vu IPTV G. 1080 [16] va IPTV-GSI [25]. Trong

[16], tiéu chuén chat luong dich vp IPTV duoc d:inh gia qua cac thaw so nhu:

• QoE for video and audio:

• Requirements for network transmission

• QoE for text and graphics

• QoE for control functions

• QoE for other IPTV services

• Accessibility requirements

Day lit khuye'n ngh i de cap day du nhat cac thaw so, chi trén de’ danh gia chat

lupng dich vij IPTV. Tuy nhién, trong khiiyén ngh i nity mot ' miic dupc de xuat nhung

son chua co gi:i tr| quy dinh cu thé, vii ITU-T khuyén nghi ciic nha khai thac vien thong

dat ra ciic gia tr] phii hpp voi tin hinh thuc té.

Mot diém dang chu y la phan khuyén right vé tiéu chuan doi voi video, audio va

cac thaw so truyén dan mang truyén Hi trong [16] céi rat nhiéu diém tuong tir nhu trong

DSL TR-126 [12]. Tuy nhiéu, tiéu chuan TR-126 céi khuyén nghi cu thé gia tri thc›i gian

tuong t:ic dich vii va dna ra cac gia tri chi trén d)o kha dung dich vii cua in (ot so nhii khai

th:is vien thong trén the’ gioi.

Khuyén right TS 181 0 16 ciia ETSI cung moi chi dna ra c:ic dé muc v:i hau nhu

khong guy dinh gi:i tri cu thé mo in:i co thé sir dung duoc trong quit trinh do kiém.

Ke't niki: IPTV lit dich vu moi dang dirpc trie’n khai tai nhiéu niroc trén the gioi. hién tai

céi nhiéu to chirc tiéu chuan hoa thaw gia viio qua trinh tiéu chuan hoa doi voi dich vu

IPTV. Hién tai tiéu chuan doi voi d|ch vu. IPTV chua dupc hoan thien chinh thuc. Cho

dén nay, hai tie’u chuan quoc té céi thé coi la so cu tot nhat dé diinh xay dung tiéu chuén

chat lupng dich vp IPTV la TR-126 cua DSL Forum va G. 1080 ciia ITU-T.

2.1 Phiin tich lq’a chpn sé cu xiiy dq’ng trén chua

2.1.1 ITU-T G.1080 va DSL TR-126

Trong ciic chuong truoc, bao ciio da de“ cap dén cms loai hinh d ich vu IPTV, tinh

hinh ph:it trién d]ch vu. IPTV trén the gioi, cac to chirc tie’u chuén hoa va cac tiéu chuan

hién tai ciia ciic to chirc n:iy lién quan den dich vu IPTV. Hién tai, hai tiéu chuan quoc te

co the coi la so cir tot nhat dé diinh xay dung tiéu chuan chat luong dich vu IPTV la TR-

126 cua DSL Forum v:i khuyén right dang trong qua trinh hoan thién G. 1080 ciia ITU-T

v‹›i c:ic ly do sari:

• Khuye’n ngh i G. 1080 d’é xuat khii da y du cms thaw so chat luong dich vp IPTV:

QoE doi voi video va audio, QoE doi voi text va do hoa, QoE doi voi sirs chtrc

nang diéu khién, QoE doi voi cac dich vu IPTV khac v:i cac yéu cau truy c:ip. Tuy

nhiéu, mot so thaw so chua céi gi:i tri guy dinh cu thé.

• Vé cc b:in muc 6 trong khuyen nghi G. 1080 dna trén muc 6 (Entertainment Video

Service QoE Objectives) trong TR-126 cua DSL Forum. Nhirng diém kh:ic biet la

G. 1080 dé xuat thém mot so chi tiéu khac ma TR-126 khong co. Co thé thay duoc

diém khac biét my la do G. 1080 tap trung vao dich vp IPTV I:i mot phan trong géii

dich vp triple-play duoc dé cap dén trong TR-126.

• Hién tai, phan ldn d|ch vij IPTV dupc cung cap den khach hung qiia wang truy cup

xDSL. DSL Forum lit dun dun chiing cho cac nhii cung cap thiet b i wang xDSL,

c:ic nhii cung cap dich vij va nha khai th:ic mang vien thong bang r(ong. C:ic

khuyen nghi ciia DSL Forum dira ra rat phii hop v‹›i c:ic th iét b |mang va dich vu

truyén I:ii trén mang DSL. Chinh vi ly' do my, trong TR-126 co khuyén nghi con

so cu the ve thoi gian tuong tac dich vu ma trong G. 1080 khong dé xuat duoc gia

tri cu thé.

• Hien nay, qua trinh phat trién d|ch vp IPTV tai Viet nam dang trong giai doan daa

va dich vu my se trién khai chu yéu trén ciic thué bao ADSL hién co. Nhu vay

viéc ap dung cac chi tiéu trong TR- 126 la rat khii thi.

• Giai doan tiép theo, cac nha khai thuc mang se phat trién ciic mang cup quang hoac

lai ghép quang-vo tuyén bang rong... dé dap irng nhu cau ve bang thong ngay cang

cao va riling cao chat luong truye’n I:ii. Trén thuc Ie, phan lén cac ye’u to gay suy

giiim chat luong dich vu IPTV xuat phat tir mang truy cap. Xét theo quan diém ciia

nguoi su dung, khong quan tain toi ha téng va cong nghe mang truyen tai dich vu,

thi khi dirpc trién khai trén c:ic wang c:ip quang, c:ic chi tiéu chat lupng dich vii

IPTV dira trén cc so wang truy cap lii xDSL sé dupc dap ting mot cach de’ dang.

23

Do v:iy, trong tuong lai, ciic thaw so chi tiéu ky thuat vé truyen dan c:in c:ip nhat

v:i nang cao hon.

• TR-126 duoc ban hanh thang 12 mm 2006 va khuyén nghi G. 1080 co phién ban

moi nhat dupc sua vao thang 12 mm 2008. Ca hai khuyén nghi my déu dam bao

tinh cap nhat.

2.1.2 C:ie tiéu chul i ve chat lwpng d;ich vu trong linh vi,rc vien thong

Cac tien chum chat luong d‘ich vij trong linh vuc vien thong [32-37] thiréng bao gore hai

phan chinh la:

• Chi tiéu chat luong ky thuat: guy dinh cac chi tiéu ky thuat lien quan dén dich vu.

Phan ton cac thaw so my I ten quan chin yéu de'n nha cung cap dich vii vii nha khai

th:ic mang con nguoi st dung céi thé khong quan tain hoac khong biet khai n iém.

Vi du nhu: trong tiéu chuén chat luong dich vu truy nhap Internet ADSL, chi tiéu

fun luong su dung trung binh cua moi hu6ng ket rio lSP trong khoang thoi gian 7

ngay lien tiép < 70% [36]. Hoac chang han trong TCN-68-176, va TCN- 68-253,

chat luong thoai duoc guy dinh theo MOS voi gia tri lan luot la lén hon 3,5 va 3,0.

• Chi tie’u chat luong phuc vu: trong phan chi tiéu nity, ciic tie’u chuan d’éu guy dinh

do kha dung dich vp trén quan truc tiép doi voi nha cung cap dich vu va khach

hang. Cac chi tiéu vé thoi gian thiet lap dich vp va tra lcii khiéu nai khach hang la

nhtrng chi tien ma mpi kh:ich hang den b iét vii quan tain.

Trong cac tiéu chuan vé chat luong dich vu, TCN 68-277: 2006 co thé lain so cu

dé xay dung tiéu chuan chat luong dich vu IPTV vi:

• Xét vé phuong dién ky thuat, ca dich vu truy cap Internet va dich vu IPTV déu

dupc truyén Hi qua mang truy cap va mang Hi cua nha khai thac vien thong. Tiéu

chum my da dirpc ap dung trén thuc te' doi voi d|ch vii truy nhap Internet sir dung

ADSL. Nhu vay, cac chi tiéu ve chat luong phuc vu se rat phu hop khi up dung

cho dich vu IPTV duoc trién khai trén mang DSL.

• Xe’t vé doi tuong up dung, hien tai, o Viet Nam, phan Ion cac nha cung cap mang

déu cung sap luon dich vu. nhu VNPT, Viettel... Thoi gian thiét lap dich vu va do

khii ding d ich vu. tuy thuoc vao kha n g thiét b i va ha tang in g cua nha khai

thac vien thong. Cac nha khai thac my cung déu céi ke hoach phat trie’n d|ch vu.

IPTV trén mang cua minh, tiéu chuén chat luong dich vu IPTV dna trén tiéu chuan

dich vu truy cap Internet ADSL co kha nang dat duoc su dong thuan chung.

2.2. 1 Phneng ph:ip xdy dqng

Du thao tiéu chuan dupc xay dung theo phuong ph:ip xay dung moi tre’n cc so thaw

khiio, up ding ap dpng tiéu chuiin quoc Ie DSL TR- 126, ITU-T G. 1080. Noi dung ciia ciic

tiéu chu:in quoc Ie my duoc ch:ip nh:in dna vao du th:to tiéu chuan, co bo sung mot so chi

tiéu vé chat luong phuc vu dna trén TCN 68-227: 2006.

2.2.2 N(oi dung du théo tiéu chuan

Tuong tu nhu cac tiéu chuan chat luong dich vii vien thong da ban hanh. Noi dung

Tiéu chuan quoc gia vé chat luong dich vu IPTV bao gore ciic phan chinh:

Tiéu chuan n:iy guy dinh c:ic yéu cau chi tiéu chat luong cho dich vu IPTV trén mang

Vien thong cong cong.

Tiéu chuan n:iy l:i sci cir dé ngiroi sir dung gum sat ch:it luong dich vu; cc quan quan ly

Nha nuéic v:i c:ic doanh nghiép cung cap dich vu thuc hién gum ly chat lupng dich vu

IPTV theo cac guy dinh ciia Nha nuoc va cua Bo Thong tin vii Truyén thong.

[1] TR-126 “Triple-Play Services Quality of Experience (QoE) Requirements”,

DSL Forum, Dec. 2006 (Cac yéu cau chat luong thuc té cho cac dich vp

Triple-Play).

[2] ITU-T G. 1080 “Quality of experience requirements for IPTV services”, Dec,

2008 (Ciic yéu cau chat luong thuc té cho dich vu IPTV).

[3] TCN 68 -227: 2006 ‘‘Dich vu truy nhap Internet ADSL - Tien chum chat

luong”, 2006.

a. D]ch vq IPTV (IPTV service)

D|ch vii da phuong ti)en nhu truye’n hinh/video/audio/van ban/do hpa/so I i)eu truyén t:ii

tre’n c:ic wang dira tre’n IP dupc kiem so:it nham cung cap muc chat lupng dich vu, do

man ngiiyen, do bao mat va tin cay theo yen ca

2

b. Doanh nghi(ep cung cap d]ch vq IPTV

Doanh nghiép vien thong cung cap d]ch vu IPTV theo ciic guy d]nh cua Nha nuoc va Bo

Thong tin v:i Truyen thong

c. Khach hang

Ca nhan, to chtrc Viét Nam hoac nuoc ngoai sir dung dich vu IPTV

d. Chat lupng d[ch vq

Ke't qua tong hpp ciia c:ic chi tien the’ h ten mtrc d(o him long ciia ngucii sir dung dich vii

doi voi dich vu do.

e. Sp co

Hu hong ciia mot hoac mot so phan tu ciia mang cua DNCCDV dan dén viéc I:inn gi:in

doan cung cap d ich vu. .

f. Phwo’ng phép xéc dJnh

C:ic phuong phap danh gi:i ch:it luong dich vu voi mirc lay mau toi thiéu duoc guy dinh

dé cc quan quan ly Nha nuérc va DNCCDV :ip dung trong viéc do kiém chat luong dich

vp. Moi chi tiéu ch:it luong dupc guy dinh mot hay nhiéu phuong phap xac dinh khiic

nhau. Trong truéng hop chi tiéu ch:it luong dich vu dupc xac dinh bang nhiéu phuong

phap kh:ic nhau guy dinh tai tie’u chum my thi tien chum chat luong dupc d:inh gi:i la

phu hop khi két qua diinh gia bcn moi phuong phap déu phu hop voi muc chi tiéu quy

dinh.

HDTV

IPTV

SDTV

VoD

EPC

Truyén hinh do trung thuc cao

Truye’n hinh dna trén giao thirc Internet

Truyén hinh do trung thuc tiéu chuan

Video theo yéu can

Huéng dan chuong trinh dién tu

2

a) C:ie chi tiéu ch1t lwpng ky thui)ti. Chi tiéu chit lirpng tin hi(eu video

> Ch I lirong tin hien video

Dinh nghia: Chat lupng tin hiéu video la chi so tich hop chat luong truyén video

duoc xac dinh bang cach tinh diém trung binh voi thang diém MOS tu 1 dén 5 theo

khuyen nghi ITU-R BT. 500-1 1 cua Lién minh Vien thong quoc té.

Chi tiéu: Diém chat luong hinh anh trung binh MOS > 3,0. Phuong ph:ip x:ic dinh:

Phuong phap mo phéing. Su dung phuong phap do theo khuyén nghi ITU-T J. 144 rev. I

va guy doi ra th:ing diém MOS.

> C:ie thaw so l6p truyén dan

Dinh nghla: ciic thaw so truyén dan tai 16p chuyén tai co gia tri duoc khuyen nghi

dé dam bao chat luong d|ch vu video trong IPTV.

Chi tiéu: De dam biro chat luong dich vu video, cac thaw

tuiin theo cac gia tr] guy d|nh trong cac bring tir I dén 4.

' léip truyén

dan phai

Phuong phap xiic dinh: Phuong phiip giiim siit. Su dung cac thiet bi do gum sat tai

thiét bi nha thué bao (set-top box). Diéu kién gia thiét set-top box co hoac khong co kha

nang bu Hi. Cac chi tiéu my chi ap dung doi voi cac luong IP truyén Hi rio dung video.

Ciic dai luong trong ciic cot (4), (5), (6) duoi day duoc hiéu theo khuyen nghi IETF RFC

Bang 2. 1 : Cac ch i tiéu truyén dan doi voi dich vu SDTV, VoD ma MPEG-2

Toc do

lu‹›ng

(I4bps) (1)

Tre, rr›s

(2)

Rung pf›a,

me

(3)

Tho› gian loi

cc dai, me

(4)

Chu ky ton tfrat

goi IP, goi IP

(5)

Khoang ton

that goi, su'

kien Jéi/gif (6)

Ti ie Joi goi

luong IP video

(7)

< 6

‹9

B:ing 2.2: C:ic chi tiéu truyén dan doi v‹›i dich vi.i SDTV,VoD ma MPEG-4 AVC hay

VC- 1

Toc do Tré, Rung Thoi gian Chu ky ton Khoang ton Ti Ie loi got

trung ins pha, ins Hi c¿c dat, that got IP, that got, sir luong IP

ins géii IP kién Hi/gici videoMbp)

)

(2)(4)

(6) (7)

E-06

1 E-06

2,5 < 200 < 50 E-06

16 1 5,85 E-06

Bang 2. 3 : Cac chi tiéu truyén dan doi véii dich vp HDTV ma MPEG-2

Toc do Tré, Rung Thoi gian Chu ky ton Khoang ton Ti lé Hi goi

luong ins pha, ins Hi cuc dai, that goi IP, that got, su luong IP

ins géii IP kién Hi/gio video(Mbps)

(6)

(4)

< 16

16

16

< 1 < I , 17 E-06

1 < I , 16 E-06

1 < I , 17 E-06

2

Bang 2.4: Cac chi tiéu truyén dan doi voi dich vu HDTV ma MPEG-4 AVC hay VC- 1

Tré, Rung Thoi gian Chu ky ton Khoang ton Ti lé loi goi

ins pha, ins Hi cms dai, that géii IP, that got, su luong IP

ins got IP ki)en to/gio video

(6) (7)

(4)

< 16

ºt6

ºt6

< 1 < I ,28 E-06

< 1 2,24 E-06

< 1 5,22 E-06

ii. Chi tiéu thin gia n twnng I:ie

Bang 2. 5 : Chi tiéu thoi gian tuong tac

\'i du

10.000

3

iii. Chi tiéu ddng bo giii’a tin hi(eu hinh vii tiéng

Bang 6 Chi tiéu dong b)o giira tin hiéu hinh va tiéng

Dong bo giira tin h i)eii

hinh va tie'ngTie’ng xiiiit h ten truoc hinh Tiéng xuat hien sari hinh

? I 5,0 ins ? 45,0 ins

b) C:ie chi tiéu chat lu’png phqc vq

Dinh nghia: Do kh:i dung cua dich vu ( D ) |a ty Ié tho gian trong do DNCCDV san sung

cung cap dich vu cho khiich hang:

T D

Trong déi:

'² : Thoi gian su co thuoc trach nhiém ciia DNCCDV duoc tinh theo cong thuc:

' tron thc›i gian xac dinh do kha dung

ft Tong so thue bao IPTV tai thoi diem xay ra su co thu ²

"' : So thué bao IPTV bi anh hu6ng trong su co thu '

Chi tiéu: Do kha dung ciia dich vi.i ? 99,5%.

Phuong ph:ip x:ic d|nh: Phuong phap thong ké. Thong ke’ toan b(o su co trong thoi

gian xac dinh d)o kha dung. Thoi gian x:ic dinh d)o kha dung toi thiéu la 3 thang.

3

ii. Thoi gian thiét lap d]ch v¿

Dinh nghia: thoi gian thiet lap dich vu duoc tinh tu Inc DNCCDV va khach h:ing

ky hpp dong cung cap dich IPTV cho Hi kh i kh:ich hung co the sir dung dirpc dich

my.

Neu DNCCDV khong the’ hpp dong cung cap dich vu thi trong vong 3 ng:iy ké

tir thoi diem nhan duoc phiéu yéu cau cung cap dich vu cua khach hang, DNCCDV phai

co van bun thong biro cho khiich héng vé viéc tu choi ky két hop dcing dich vu va néu ro

Iy do tir choi.

Chi tie’u: It nhat 90% so hop dong cung cap d]ch vu co thoi gian thiet lap dich vu.

trong khoiing thoi gian guy d]nh nhu sau:

Truéng hop khong lap dat dufing thué bao, E < 5 ngay.

Trufing hop co lap dat dufing thué bao, E duoc cong thém thoi gian lap dat

duong thué bao E,

- Noi thanh, thi xa: E,

é 15 nguy.

Phuong phap xac dinh: Phuong phap thong ke’. Thong ké to tin bo yéu cau thie’t lap

dich vu IPTV ciia DNCCDV trong khoang thoi gian it nhat la 3 thang.

Chi tiéu: It nhat 90% so lan mat dich vp duoc khac phuc trong khoang then gian

guy dinh nhu sari:

< 36 gio.

72

3

Phuong ph:ip xac dinh: Phirong ph:ip thong ke’. Thong ké day dii so lien khac phuc

d|ch vp trong khoiing thoi gian it nhat la 3 thiing.

Chi tiéu: Khieu nai cua khach hang ve chat luong d|ch vii ? 0,25 khie'u nai/100

khach héng/3 thang.

Phuong phap x:ic dinh: Phuong ph:ip thong ke’. Thong ké to:in bo so kh ten na ciia

khach hang vé chat lupng dich vu trong khoang thoi gian toi thiéu la 3 thang

v. HP i erm I:hién net khach héng

Dinh nghla: Hoi am kh ieu na cua khach hang la van b:in cua DNCCDV thong b:to cho

khach h g co don, thu khiéu nai vé viéc tiép nhan khiéu nai va xem xét gun quyét.

Chi tiéu: DNCCDV phai co van ban hoi am cho 100 % khach hang khiéu nai trong

then han 48 gio ké Nr thoi diem tiép nhan khiéu nai.

Phuong phap xac dinh: Phuong phap thong ké. Thong ké to an b)o cong v hoi am

cho kh:ich h:ing vé chat luong dich vu trong khoang th‹ii gian Hi thiéu la 3 thiing

Chi tiéu:

-Th‹ii gian cung cap dich vu ho tro khach hang bang nhan cong qua dién thoai la

24 h trong ngay.

-Ty Ie dich vu ho tro kh:ich hang chiém mach th h cong va nhan

duoc tin hiéu tra loi ciia dién thoai vién trong vong 60 guy > 80%.

Phuong phap xac dinh: Thuc hién goi nhan cong téri dich vu ho tro khach hang, so

cuoc got thir toi thiéu I:i 250 cuoc got vao cac gio kh:ic nhau trong ngay.

3

CHU’ONG III: AP DUNG CO CHE THU’C HI N D]CH VU IPTV CHO VNPT

3.1 Tim him nhu can sir dqng IPTV fr Vi(t Nam

Tir mm 2006, nhin thay dupc xu hudng ph:it trién manh mé cua IPTV, VNPT da

giao cho Cong ty Phan mém va Truye’n thong VASC nghién cmi th i truéing, xay dung ke

hoach phat trién vii trién khai dich vu. Tai thoi diém do, du IPTV van co la mot khai

niém kha moi mé, nhung nhirng ket quit nghie’n ciiu thi truéng cua VASC da cho thay

tie’m nang cfia viec trién khai IPTV tai Viét Nam.

De xay dijng phuong an trién khai dich vu IPTV VASC da khao sat tai 4 thanh

pho lén la Ha Noi, Tp.Ho Chi Minh, Da Nang, Hai Phong va tap trung vao cac doi tuong

la ca nhan trong d)o tuoi 18-50, co quan tain den c:ic dich vu gi:ii tri truye’n hinh va biét sir

dung Internet. Miic tiéu cua cuoc khao s:it nham tire hie’u tho quen gi:ii tri cua cong

chung, tim hiéu muc do chip nhén cua cong chung dci i véi dich vu truyén hinh truc

tuyén, video theo yéu cau va ciic ciic dich vu gia tri gia tang ciia IPTV, du bao nhu cau sir

dung dich vu IPTV va phan tich du lieu thu dooc nham dé xuat cac dinh hudng kinh

doanh dich vu.

Ket qu:i cho thay, voi sir phat trie’n khong ngirng cua kinh te'- xa hoi, nhii cau giai

tri cfia nguoi dan ngay nang cao. Gan 1/3 dc› i twcjng dwpc khao siit co nhu cau truy c)ap

Internet, 1/8 co thoi quen xem phim tai rap vii choi video game. Dac biet, 1/2 doi tuong

dupc khao sat co dang k y su dung truyén hinh cup/ky thu )at so, cho thay su quan tain ciia

ho doi voi cac loai hinh dich vu giai tri truyén hinh, dat biét la hinh thirc dich vu TV so

tra tiéu. Trén cc scr gioi thieu d]ch vu IPTV, dcing dao khach hang dupc hoi rat quan tain

dén dich vp my, trong do trung binh co trén 50% doi tuong cho biét se dang ky su dqng

dich vu. Day la nhitng du bao lac quan cho thay IPTV sé dupc don nhan nhu mot luong

gio moi ve cong nghe gi:ii tri tien ich.

Bén canh do, Viet Nam dang céi nhie’u yen to thuan lot de’ phat trie’n IPTV, trong

do phiii ké dén ty lé dan so tre chiém hon 70%, toc dci tang trucing thué bao Internet bang

rong ngay cang cao, ha tang truyén dan mang khong ngung duoc nang cap. . . Chinh vi

vay, khong chi xét trén goc do dap ung nhu cau thi trufing, viéc trién khai cung cap dich

vu IPTV se tao cc h)oi kinh doanh moi cho cac nha cung cap dich vu, dac biét la tao nén

su tang trudng thué bao bang, gop phan tang doanh thu va khai thac toi da mang bang

rong hién co.

3

3.2 Tinh hinh trien khai IPTV cua VNPT

3.2.1 Tong quan

VNPT lira chon mm 2009 lain their die’m de’ cung cap dich vii, viéc trién khai

th:inh song d ich vii IPTV phii thuoc vao 3 yéu to mau shot nhat I:i: noi dung, chat luong

dufing truyén va thi truong. Véri ciic yéu to n:iy, den nay VNPT da co hé thong mang

bang rong rong khap v:i chiém toi hon 75% thi phan bang rong ca nuoc (I .5 triéu thué

bao). Cung voi do, vira qua, VNPT da ho:in thanh viéc trién khai mang thé hé moi NGN,

tao diéu kién thuan lpi cho viéc trién khai dich vp IPTV va cac dich vu gi:i tn gia tang

khac trén mang bang rong. Khong chi chuén bi tot cac yeu to vé mat ha t:ing, thoi gian

qua VNPT cung da khong ngirng thuc d:iy viéc hop tac phat trién c:ic dich vu rio dung

v‹›i c:ic doi tiic trong vii ngoai nu‹›c. Ch inh vi the, miic tiéu ciia VNPT lit hudng téii vi)ec

trién khai ciic d|ch vu. IPTV day dii (full-service), co chat lupng cao d¿a trén mot ha téng

mang luén v:i c:ic ring dung noi dung du nang luc phuc vu.

Theo lo trinh trién khai dich vu ciia VASC, du kién trong giai doan 1 se co khoang

14 dich vu IPTV duoc cung cap, trong d‹i co c:ic dich vu cc ban nhu Live TV, VoD,

TVoD, Mod, Information, dich vii quiing c:to. . . Giai doan 2 ciia du :in, c:ic dich IPTV

tien ich khac nhu Media sharing & Photo album, Usage data, E-education. . . se depc trién

khai day du dén khach h:ing, nang tong so cac dich vu IPTV cfia VNPT lén hon 30 d|ich

vu. . Doi voi cac kénh truye’n hinh, buoc dau, VNPT se cung cup khoang 32 kénh truye’n

hinh (trong dé cé 13 kénh co ban quyén nuoc ngoai, 4 ke’nh HD, cé ho trp ciic tinh nang

xem lai, tain dimg) va sau do du kién se nang lén 60-100 kénh truye’n hinh. Dac biet, the

manh vuot trot ciia VNPT I:i cung cap nhie’u dich vu gi:i tri gia tang ma h ién c:ic doanh

nghiép khac chua co, dci I:i ciic dich vu TVoD, Music, Karaoke, Game, quang cao,

3.2.2 Gi:ii ph:ip trién khai d;ich vu IPTV

Cau truc mang nhu hinh 3. 1 . Tat ca cac fun luong tu trung tain IPTV déu duoc

dinh tuyén dén thiét bi PE M20 ciia Cong ty Vién thong Lien tinh (VTN). Cac luu luong

dich vu sau do di qua mang core dén BRAS tai cac tinh thanh. Tu BRAS, cac luu luong

duoc day xuong cac access switch 16p 2, DSLAM, va cuoi cung Hi thué bao.

IPTVCenter

Core Router M160

Core Router M160

VoDSewer

VoD Server

DStAMs

Do nhu

Hinh 3. 1 : Mo hinh dau noi hé thong cung cap dich vu IPTV

“u sir dung cling nhir bang thong ch nan dung cua d |ch vij VoD rat lén

nen de’ giam Hi cho he thong mang, dac biét la mang duong truc, cac VoD server thir cap

se dupc trién khai tai cac dia dure gan voi thué bao hon. Co hai vi tri co the’ bo tri cac

VoD server thir cap:

• Bo tri VoD server tai BRAS.

• Bo tri VoD server tai access switch.

Giai phap bo tri VoD server thu cap tai cac BRAS kha thi hon vi:

• Bo tri VoD server tai c:ic access dot hot ch i phi rat lén cho mot

server.

VoD

3

• BRAS la diém I:ip trung luu luong voi so luong thue’ bao hop ly.

• BRAS hoat d(ong c› top 3 nén viéc ca hinh, diim biro QoS vii qiiiin ly cung de’ dang

3.2.2.2 MW hinh hocit dcrng

Mang khach hang su dung mo hinh tinh xa dich vp multi-VC

Dich vp IPTV dupc cung cap trén cac ket noi ADSL2+. Moi ket noi ADSL2+ dén

thué bao gore co 2 PVC khac nhau nham cung cap 2 loai dich vu:

• PVC 1 : cung cap dich vu truy nhap Internet toc dci cao (HSI)

• PVC 2: cung cap dich vu video (bao gore ca VoD, BTV,. . .)

Khach hang su dung cac thiét bi dau cuoi khac nhau cho tung loai dich vp:

• Video: STB (Set-Top Box)

• Internet: PC

Ket rio ADSL2* dupc ke’t cuoi boi modem hoac gateway. Cas thie’t b i my chuye’n

cac luu lupng tre’n cms PVC dén giao dién dau ra tuong irng két

cuoi d ich vu.

6, Ming truy nhap (access iietw'ori‹)

Mang truy nhap tai cac tinh thanh dupc trién khai theo mo hinh S-VLAN (Service

VLAN hay VLAN per service). Nguyén tac thuc hien mo hinh: mc g truy nhap tai cac

tinh thénh bao gore cac thiét b] mang, cac két noi mang tfi cac DSLAM dén BRAS.

Trong mang truy nhap cau hinh cac VLAN khac nhau cho tirng loai d]ch v¿ se dupc cung

cap. Tai bién cua mang truy nhap, cac luu luong truoc khi di vao mang duoc phan loai dé

tinh xa vao cac VLAN dich vu.

Cu thé doi voi hé thong mang hién tai, mo hinh S-VLAN hoat dong nhu sau:

• Tai cac IP-DSLAM, moi cong ADSL2* gore 3 PVC,

vp (Internet, VoIP, video).'i PVC danh cho mot dich

• Tai ciic giao dién chinh uplink, ciic PVC duoc tinh xa vao ciic S-VLAN tuong ung

voi tung loai dich vu sir dung phuong thuc dong got 802. lq. Cac S-VLAN my

bao gore:

HSI VLAN: VLAN danh cho dich vu truy nhap Internet

VoIP VLAN: VLAN d:inh cho dich vu VoIP

3

VoD VLAN: VLAN danh cho dich vu VoD

BTV VLAN: VLAN danh cho d|ch vu truyen hinh (multicast).

Hinh 3.2: Mo hinh S-VLAN trong mang tniy nhap

Tai cac switch ldp 2, access switch, cau hinh giao dién trunk mang luu luong ciia

cac S-VLAN my.

Cac bién phap dam bao QoS duoc ap dqng trén I g S-VLAN thong qua cau hinh

802. Ip doi voi cac S-VLAN tuong ung. Tai BRAS, rim ket cuoi cac S-VLAN, thuc hién

QoS lép 3 bang DSCP (Different Service Code Point). Nhu vay tai BRAS cm can hinh

chuyén doi QoS tir 802. Ip cua Idp 2 sang DSCP cua 1‹5p 3.

Doi voi dich vu truy nh:ip lntemet toc do cao (HSI), thué bao thuc hién quay so

PPPoE dén BRAS. BRAS c:ip dia chi IP cho tirng két noi PPPoE, thuc hién NAT (néu

c:in) va chuyén tiep cac luu luong ra Internet.

Doi voi c:ic dich vu video, d|a chi IP dirpc cup d(ong bang DHCP. Tai BRAS cau

hinh DHCP relay chuyén tie'p c:ic géii tin DHCP dén DHCP server vii thuc hien dinh

tuyén ciic goi tin ciia cac d|ch vu. my dén dich mong muon.

d, Linh ltrcriig multicast

C:ic giao thirc thirc hie’n ta cac thie't b i nhu tre’n hinh ve’ 3.4.

Mot so BRAS khong ho tro multicast VPN da chay song song IP va IP/MPLS

trén mang dufing trpc, trong do IP dung de truyen luu lupng multicast.

Ciic BRAS ho tro multicast VPN chay multicast VPN de’ truye’n luu luong

multicast qua mang duéing truc.

3.2.3 M(ot so nhi)n xét

Ban dau VNPT méii ch i trie’n khai d]ch IPTV o c:ic tinh/thanh pho 1dn, chua the’

mo rong dupc c:i nuoc do chua tim hiéu dupc nhu cau thuc te ta c:ic dia phuong va gin

thanh dich vu van con cao chua thich hpp voi da

3

Hinh 3.4: Mo hinh truyén I:ii multicast cua VNPT

He thong truy nhap dupc quiin ly hi)eu quit do VNPT da céi ha tiing wang kh:i virng

chac, ve’ in jat not dung chuong trinh co phu thu (oc vao c:ic nhii cung cap n(o i dung ne’n co

the x:iy ra c:ic van dé vé ban quyén vii sir thieu dong bo giira c:ic nha cung cap not dung

véii nha cung cap dich vu.

He thong middleware dat tap trung tai ciic trung tain lori nhu Ha Noi, TPHCM chi

duoc dap ting duoc trong giai doan dau moi trién khai dich vp vi ’ lupn thué bao con

it, khi mo rong dich vu so thué bao tang lén thi hé thong sé trci nén qua tai.

Hién tai VNPT dang cung cap d ich vu IPTV trén cc scr ha I:ing mang truy nh:ip sir

dung cong nghé xDSL nén chat luong dich vu moi dung lai ci mirc théia thu:in voi kh:ich

hang.

4

Trong tuong lai, khi nhu cau dich vu duoc nang cao, dé trién khai dich vu IPTV

thiinh cong ca thay do i cong ngh)e ciia wang truy nhap dé d:inn bao chat luong dich vii

cling nhu yen cau ve ' luong ngu‹›i dung va bang thong.

3.3 Mot so dé xuiit en ché thq’c hi(n d]ch vq IPTV cho VNPT

3.3.1 Cn che chung th¿c hi(n d)ch vq IPTV

Ca tim hie’u nhu céu thirc té tai c:ic d |a phuong dé trén hanh lap d)at hé thong

wang truy nhap, he thong in:iy chin mot c:ich hpp ly de tiét kiém chi ph i khi mo rong dich

. San khi mo rong dich ra to an quoc thi cm mo rong hoac phan t:in mot phan

middleware cho ciic hé thong nho cap viing.

De’ law phong phu noi dung chuong trinh thi VNPT can hop tac voi nhie’u nha

cung cap noi dung va cén co su lien két chat che ciic nha cung cap voi nhau de diim biro

vé mat ban quyén va tinh dong bo vé noi dung. Ngoai ra, de nang cao chat luong dich vp

thi mang truy nhap nén sir dung mang quang do mang cap quang céi bang thong 1éin du

kha nang d:ip irng nhii cm cua ngircii st dung.

3.3.2 Ve cc che thq’c hi(en Broadcast TV

Cac chuong trinh quang ba duoc trién khai theo phuong thuc Multicast trén ne

mang IP. Hé thong mang cdi phai ho tro va cau hinh cho phép luu luong IP Multicast

mang rio dung tir trung tain he thong cung cap dich vp toi dau cuoi khach hang trong

pham vi cung cap dich vu (tie’n Hi trén pham vi to an quoc)

Giao thuc thuc hién trong he thong IPTV doi voi cac irng dung multicast nén la

giao thuc IGMP v2 vi giao thuc my ho tro hau het cac Eng dung cung nhu ciic thiet bi

mang hién co. Trong tuong lai, khi cac thiét bi da ho tro IGMP v3 thi se chuyen sang su

dung IGMP v3. Do sir dung cong nghé truy nhap xDSL nén sir dung giao thirc H264 cho

ky thuat ma hoa vi no la giao thfic h i)eu qii:i cho bang thong thap.

3.3.3 Vé cc che thq’c hi(en on Demand va Interactive

Cac chuong trinh theo yéu cau (on Demand) duoc trién khai theo phuong thirc IP

Unicast trong cac pham vi nhat dinh (viing, tiéu viing, thanh pho . . .). Cac fun luong my

phai duoc gioi han chi trong pham vi cung cap dich vp tuong mug, khong duoc chay

xuyén suot giira cac viing cung cap dich vp khac nhau gay lang phi bang thong cua he

thong duéng trijc.

Nén dat cac in:iy chit VoD o g:in thué bao dé gram luu luong Hi mang liii. Sir

dung RTSP dé truyén t:ii vi no dam bao tinh thoi gian thuc cho cac dich vu cung c:ip cho

kh:ich hung.

4

Tong ket chirnng 3

Chuong 3 tdp trung noi dung chinh ve danh gia hién trang mang vién thong hien

tai ciia VNPT, nguyén tac cc bun to chirc mang IPTV vii cau tins két noi ciic phim tu

trong mang khi trién khai d ich vu. IPTV :ip dung cho mang vie’n thong VNPT. Dé xuat

mot so giai phap thuc hién dich vp IPTV cho VNPT

KET LUAN

Xét trén khia canh cong nghé, xu hu6ng cong nghé hién nay la su hoi tu ciia nhiéu

cong nghé dé dna ra nhirng loai hinh dich vp tong hop (nhu két hop cac dich vu thoai, so

tiéu va bang rong) cho khach hang, dong thoi tan dung dupc nhirng cc so ha tang san céi

dé gum thiéu chi phi dau tu nang cap. Dich vu IPTV chinh la mot san pham ciia su hoi lii

do khi ma ch i v‹›i mot thiet bi dau cuo i kh:ich hang co the’ sir dung rat nh ten c:ic loai hinh

d|ch vp con (truye’n hinh quiing ba, truyén hinh theo yéu cau, dren thoai thong thuéng,

dién thoai IP, dren thoai truyén hinh, truy c(ap Internet, v.v...). Hon nira viec ap dung cong

nghe de trién khai nhtrng d|ch vij v‹›i cac chi phi nho, toi uu ho:i ha tang vien thong san

co se’ tang sirc canh tranh. Trong then ky kinh te thi trir‹›ng, khi Viet Nam dang dan ho i

nhap voi thé gioi, nhung dich vu co chat luong cao voi gia th:inh phii hop voi dcii song

nguoi dan se’ ngay mot trcr thanh mot phim thiét yéu cua xa hoi. Voi nhiéu tien ich mang

lai dna trén ha tang so san, trong tuong lai IPTV se’ rig:iy mot pho bie’n hon, ciich d ich vu

va chuong trinh ngay mot phong phu hon dap ring nhu cau ciia khach hang, gop phan

thuc day phat trién xa hoi.

Dong thoi co thé khang dinh véii ha tang mang truy nhap hiiu tuyén va vo tuyén

bang rong trén cc sc› mang NGN hién dat ma c:ic nhii khai th:ic cung cap dich vp cua Vi)et

Nam da va dang hirdng toi xay dung thi viec trién khai dich vq IPTV la hop ly va kha

nang b:to d:inn dap mug yen cau trién khai d|ch vu nity la hoén to an kha thi

Sau mot thoi gian nghién ciiu va tim hiéu citng voi su huong dan cua thay quo Do

Van Trang, em da hot thanh dé Hi “Nghién cii’u cc ché thqc hie d]ch vq IPTV” voi

nhung rio dung chinh sau:

• Gioi thiéu chung vé IPTV, trinh bay khai mean IPTV va cac uu nhuoc diem ciia no

so véii cac dich vu truyén hinh khac.

• Xay dung ciic tiéu chuan chat luong dich vu cua IPTV

• Trén cc so ti in hién nhu ca va tinh hinh trién khai cac d|ch IPTV dé xuat :ip

dung cc che thirc hien d]ch vu. o VNPT

Do day la mot van de’ lén ne’n d’o Hi moi chi tap trung tim hiéu cc che’ thuc hién

ciic d ich vu. IPTV va giai ph:ip trién khai IPTV cfia VNPT in (ot cach tong quan. Huong

tie’p theo cua do an la tiép tuc tim hiéu sau hon giai phap trién khai cung voi cac giai phap

kinh doanh, mo hinh khai thac dich vu, cac giai phap cung cap noi dung,

Mac dii da hét sirc co gang nhung do noi dung van dé con méri, thoi gian v:i trinh

do co han ne’n de’ ta khong tr:inh khc›i nhirng th ten sot, em rat mong nhan dupc y kien

dong gop ciia c:ic thay co giao va c:ic ban dé co thé tie'p Inc ho:in thien v:i nghién ctrii de’

t:ii sau hon

43

TAI LIEU THAM KHAO

Gerard O’Driscoll, Next Generation IPTV Services And Technologies, 2008

Gilbert Held, Understanding IPTV, 2007

David Ram irez, IPTV Security, 2008

Wcs Simpson, Video Over IP 2' d Edition, 2008

Qty://vasc.com.vn

Tran Thé Tuynh., “Danh gia chat luong truyen dan video MPEG trong mang IP”.,

TCBCVT, 2006

Bo TTTT, Dé ta 9 I -07-KHKT-RD “Ngh ten ciiu cong nghé IPTV va kha nang

trie’n khai trén wang Nam”, Ha Noi 2007

ETSI TS 181 016 V3. 1 . 1 “ Service layer requirements to integrate NGN services

and IPTV”, July, 2009.

Gilbert Held., Understanding IPTV, Auerbach. 2007

Cac bai bao trén internet