Chuyen de Iptv- Ptit

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<p>B THNG TIN V TRUYN THNG HC VIN CNG NGH BU CHNH VIN THNG VIN KHOA HC K THUT BU IN</p> <p>Gii thiu chuyn :</p> <p>TNG KT CC TIU CHUN CHO IPTV</p> <p>H ni 2009</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>Ni dung 1 Gii thiu v l do la chn chuyn ..........................................................................4 2 Cc ch vit tt ...............................................................................................................4 3 Tng quan v h thng cung cp dch v IPTV/VoD ....................................................7 3.1 3.2 3.3 4.1 Kin trc h thng ..................................................................................................7 u im ca IPTV .................................................................................................9 Nhc im ca IPTV .........................................................................................11 Chc nng ca cc module ..................................................................................11</p> <p>4 Cc module chc nng c bn ca h thng cung cp dch v IPTV/VoD .................11 4.2 Cc yu cu i vi cc module trong h thng cung cp dch v IPTV/VoD ...14 4.2.1 Cc yu cu v vic bo v v qun l ni dung IPTV .................................14 4.2.2 4.2.3 EPG 4.2.4 4.2.5 4.2.6 Cc yu cu i v cht lng ca cc dch v IPTV ...................................15 Cc yu cu cho h thng DBM (Data Broadcast Middleware) v Enhanced .......................................................................................................................15 Cc yu cu v Metadata ca cc dch v IPTV ...........................................17 Cc yu cu v m ha cho IPTV .................................................................18 Cc yu cu v bo mt ni dung ((DRM/CAS) ..........................................19</p> <p>5 Phn tch nhng yu t nh hng n cht lng dch v IPTV/VoD ......................21 5.1 C ch m ha, tc bt v ni dung hnh nh ..................................................21 5.2 Gii hn v bng thng ........................................................................................22 5.3 Mt gi .................................................................................................................22 5.4 Nghn trn server .................................................................................................23 5.5 Jitter v timing drift..............................................................................................23 5.6 Mng li, mng truy nhp v mng ti thu bao..................................................24 6 Tng kt cc tiu chun k thut v cht lng dch v IPTV/VoD trn th gii.......24 6.1 DSL Forum ..........................................................................................................24 6.2 MPEG...................................................................................................................25 6.3 ETSI .....................................................................................................................25 6.4 ITU .......................................................................................................................26 6.5 ATIS .....................................................................................................................30 6.6 Open TV Forum ...................................................................................................31 6.7 Broadband Services Forum (BSF) .......................................................................31 6.8 IPDR.....................................................................................................................32 6.9 ISMA ....................................................................................................................32 6.10 Nghin cu b tiu chun ca Chu u p dng cht lng dch v cho IPTV/VoD ......................................................................................................................32</p> <p>Trang 2/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>6.11 Nghin cu b tiu chun ca M p dng cht lng dch v cho IPTV/VoD .33 7 Ti liu tham kho ........................................................................................................36</p> <p>Trang 3/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>1</p> <p>Gii thiu v l do la chn chuyn IPTV (Internet Protocol Television) l h thng cung cp dch v truyn hnh s</p> <p>bng cch s dng giao thc IP qua h tng mng, c th l thng qua mt kt ni bng rng. nh ngha chung v IPTV l ni dung truyn hnh thay v c truyn i thng qua cp hay qung b truyn thng th s c chuyn n ngi xem thng qua cc cng ngh s dng cho mng my tnh. Khng ging nh cc dch v streaming s dng kt ni best-effort trn internet, IPTV thng c xy dng da trn mng c qun l tt m bo cht lng video. IPTV thng c cung cp km vi dch v Video on Demand v c th cng vi cc dch v Internet nh dch v truy cp web v VoIP cho ngi s dng. Gi cc dch v IPTV, VoIP v truy nhp Internet c gi l dch v Triple Play (nu b sung thm cho di ng th gi l Quadruple Play). V vy dch v IPTV s l dch v thit yu v quan trng nht cho cc nh cung cp Triple Play n ngi s dng. Dch v IPTV ang rt thnh hnh cc nc Chu u v s khch hng s dng dch v IPTV ngy cng tng ln. Hn na nhiu nc ang c k hoch gii thiu dch v IPTV n Chu u v Nam M. V vy, hin nay IPTV vn ang l mt ch nng c bn lun v nghin cu xy dng tiu chun trn cc din n quc t cng nh cc t chc tiu chun trong vn cht lng dch v IPTV ang c quan tm v ch trng nhiu nht. Chuyn ny tng kt cc tiu chun v cht lng dch v IPTV trn th gii bao gm cc ni dung sau: Tng quan v h thng IPTV Cc module chc nng c bn Nhng yu t nh hng n cht lng dch v IPTV Tng kt cc tiu chun v cht lng dch v IPTV trn th gii. 2 Tn tt AVP Cc ch vit tt Ting Anh Audio-Visual Profile Nghia</p> <p>Trang 4/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>BCG BGMP CDP</p> <p>Broadband Content Guide Border Gateway Multicast Protocol Content Delivery Protocols Dynamic Host Configuration</p> <p>DHCP DNS DVB</p> <p>Protocol Domain Name System Digital Video Broadcasting Digital Video Broadcasting -</p> <p>DVB-H ESG EPG</p> <p>Handheld Electronic Service Guide Electronic Program Guide European Telecommunications</p> <p>ETSI FEC</p> <p>Sdandards Institute Forward Error Correction File Delivery over Unidirectional</p> <p>FLUTE FTP HTTP ICMP IETF IGMP IP IPDC IPTV LC</p> <p>Transport File Transfer Protocol Hypertext Transfer Protocol Internet Control Message Protocol Internet Engineering Task Force Internet Group Management Protocol Interent Protocol IP Data Cast Internet Protocol TeleVision Layered Coding</p> <p>Trang 5/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>LCT</p> <p>Layered Coding Transport Multimedia Broadcast/Multicast</p> <p>MBMS MLD MPEG MSDP</p> <p>Service Multicast Listener Discovery Moving Picture Experts Group Multicast Source Discovery Protocol Organization for the Advancement of</p> <p>OASIS PIM RFC RP RTCP RTP RTSP STB SIP SNTP SM SSM TCP TLS TS UDP</p> <p>Structured Information Standards Protocol Independent Multicast Request for Comments Rendevous Point Real-Time Control Protocol Real Time Protocol Real Time Streaming Protocol Set-Top-Box Session Initiation Protocol Simple Network Time Protocol Sparse Mode Source-Specific Multicast Transmission Control Protocol Transport Layer Security Transport Stream User Datagram Protocol Universal Mobile</p> <p>UMTS</p> <p>Telecommunications System</p> <p>Trang 6/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>WSBN</p> <p>Web Services Base Notification</p> <p>3</p> <p>Tng quan v h thng cung cp dch v IPTV/VoD 3.1 Kin trc h thng H thng IPTV bao gm bn thnh phn chnh, tt c cc thnh phn ny l</p> <p>chung cho bt k kin trc h thng ca nh sn xut no.</p> <p>Hnh 1: Cc thnh phn ca mng IPTVVideo Head End Cng nh vi h thng truyn hnh v tinh s hay truyn hnh cp, dch v IPTV cng cn c h thng video head end. y l ni m ni dung linear (v d broadcast TV) v on-demand (v d phim) c ghi li v nh dng truyn qua mng IP. V c bn th u vo ca b head end l cc chng trnh c thu qua v tinh hoc ly trc tip t cc b broadcast hay cc chng trnh qua b aggregator. Mt head end mang mt knh ring v m ha n di nh dng video s, nh MPEG2. Hin nay cc nh cung cp dch v broadcast cng bt u s dng m ha MPEG4 v n c mt s u im hn so vi MPEG2 nh yu cu tc b bit thp cho c tn hiu truyn hnh SD v HD. Sau khi m ha, mi knh c ng gi IP v c truyn qua mng. Cc knh ny l cc dng IP multicast in hnh, tuy nhin mt s nh sn xut cng s dng lung IP unicast. IP multicast c rt nhiu u im v n cho php nh cung cp dch v truyn mt lung IP trn knh broadcast t video head end n mng truy nhp ca nh cung cp dch v. Cch ny c rt nhiu u im khi nhiu ngi s dng mun s dng cng mt knh broadcast ti cng thi im (v d hng nghn ngi xem cng mun xem mt s kin th thao) Mng Core/Edge ca nh cung cp dch v</p> <p>Trang 7/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>Nhm cc lung video m ha c truyn qua mng IP ca nh cung cp dch v. Mi nh cung cp dch v c mt mng ring ca h v mng ny thng bao gm thit b t nhiu nh sn xut. Cc mng ny c th l mt hn hp ca mng IP hin c v mc ch l xy dng mng IP cho vic truyn video. Ti Edge, mng IP kt ni vi mng truy nhp. Mng truy nhp Mng truy nhp l lin kt t nh cung cp dch v n thu bao khch hng. Kt ni bng rng gia nh cung cp dch v v khch hng c th s dng nhiu cng ngh khc nhau. Nh cung cp dch v vin thng s dng cng ngh DSL phc v cho thu bao khch hng. Nh cung cp dch v cng bt u s dng cng ngh quang nh PON (passive optical network) kt ni n khch hng. Mng IPTV s dng ng truyn ADSL v VDSL cung cp bng thng m bo cho hot ng ca dch v IPTV n thu bao. Nh cung cp dch v s thay th thit b (nh DSL modem) ti thu bao phn pht kt ni Ethernet n mng ca khch hng. Mng ti thu bao Mng ti thu bao cung cp dch v IPTV n khch hng. C rt nhiu loi mng ti thu bao khc nhau nhng dch v IPTV yu cu bng thng cao ti mng ca thu bao. im cui trong mng ca thu bao m TV c kt ni n l set top box. Middleware: b cho php thc hin dch v IPTV Thut ng IPTV Middleware c dng m t cc gi phn mm lin quan n vic phn pht dch v IPTV. C rt nhiu nh sn xut thc thi gi phn mm ny, mi nh sn xut c cch tip cn ring i vi IPTV. Middleware do nh cung cp dch v s dng c th nh hng n kin trc ca mng IPTV. Middleware c kin trc client/server in hnh, trong client nm STB. Middleware nh ngha cch khch hng tng tc vi dch v. V d giao din ngi s dng v dch v sn c cho khch hng s dng (nh EPG Electronic Program Guige, VoD hay PPV) c thc hin v iu khin thng qua Middleware. Tnh d dng trong qun l nhiu dch v l mt chc nng ca mng IP hai chiu. Kin trc IP ny cung cp tiu chun cho cc ng dng v dch v c tch</p> <p>Trang 8/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>hp vo trong mng, IPTV ch l mt dch v trong cc ng dng ny. Nhn t phn bit trong m hnh dch v IP l tnh hi t. Bi v cu trc chung cho cc ng dng v dch v, tnh hi t c th c hin thc ha cho cc thnh phn mng, ng dng, h thng h tr hot ng (OSS/BSS). V vy qun l a dch v tr thnh bi ton qun l cng cc dch v qua mng v phn b chng n nhiu mi trng ngi dng u cui khc nhau. IPTV Video on Demand (VoD) Video on Demand hot ng theo cch khc so vi dch v broadcast TV v h thng IPTV s cung cp cho thu bao mt lung unicast ca chng trnh c cc chc nng VCR bao gm pause, fast forward, rewind. IPTV middleware s iu khin giao ien ngi s dng v c th c m rng phc v cc dch v nh Subcription VoD v PVR. 3.2 u im ca IPTV H thng IPTV da trn IP nn c nhng u im ng k, bao gm kh nng tch hp truyn hnh vi cc dch v IP khc nh truy nhp internet tc cao v VoIP. Mng IP cng cho php truyn nhiu thng tin hn v vi nhiu chc nng hn. Trong mng v tinh hay TV truyn thng, s dng cng ngh broadcast th tt c ni dung c truyn lin tc n mi thu bao, thu bao chuyn knh ti set top box. Thu bao c th la chn t nhiu la chn nh cng ty v tinh, cp, truyn thng a lung thng tin v nh. Mng IP lm vic khc. Ni dung c gi trn mng v ch nhng ni dung khch hng la chn l c gi n nh thu bao. iu ny s tit kim bng thng v s la chn ca khch hng t b gii hn bi ng ng dn n nh thu bao. iu ny cng c ngha l tnh ring t ca khch hng c m bo hn so vi h thng v tinh v TV truyn thng. Tnh tng tc H thng IPTV cho php ngi xem c c hi xem cc chng trnh TV c tnh tng tc hn v c nhn hn. V d nh cung cp dch v c th cung cp chc nng tng tc cho php ngi xem la chn ni dung xem theo tn phim hay tn ca din vin hay chc nng picture in picture cho php ngi xem c th chuyn knh</p> <p>Trang 9/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>m khng phi ri b chng trnh h ang xem. Ngi xem cng c th xem trng thi ca ngi chi trong khi ang xem mt chng trnh th thao, hay ngi xem c th thay i gc quay camera. Ngi xem cn c th truy nhp vo album nh v kho nhc trn PC ca h t mn hnh TV, s dng in thoi t lch ghi li cc chng trnh TV yu thch. Ngoi ra h cn c th s dng chc nng gim st iu khin (parent control) cm con ci xem mt s chng trnh TV khng ph hp. VoD VoD cho php khch hng duyt mt chng trnh trc tuyn hoc mt danh sch cc b phim xem qua v sau l la chn chng. V mt k thut, khi khch hng la chn mt b phim, th mt kt ni point-topoint c thit lp gia b gii m ca khch hng (Set top box hoc PC) v server phn pht lung ni dung. Bo hiu v cc chc nng nh pause, backward/forward c m bo bi giao thc RTSP (Real Time Streaming Protocol). Dng m ha chung nht c s dng cho VoD l MPEG2, MPEG4 v VC-1 trnh hin tng n cp bn quyn ni dung phim th ni dung ca VoD thng c m ha. Vi cng ngh IPTV vic m ha c thc hin hiu qu thng qua h thng DRM (Digital Rights Management). Vi h thng ny nu khch hng la chn xem phim trong thi gian 24 gi th sau 24 gi ni dung film s khng th xem c na Cc dch v hi t da trn IPTV Mt u im khc ca mng IP l kh nng tch hp v hi t. Cc dch v hi t y ni n kh nng tng tc ca cc dch v hin c theo cch trong sut to ra cc dch v gia tng mi. V d l dch v On-Screen Caller ID, nhn Caller IP trn mn hnh TV v kh nng x l (gi n voice mail). Cc dch v da trn IP s cung cp kh nng cho khch hng c th truy nhp bt k u, bt k khi no n ni dung thng qua TV, PC hay in thoi ca khch hng, v kh nng tch hp cc dch v v ni dung gn cht chng vi nhau.</p> <p>Trang 10/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>3.3 Nhc im ca IPTV V IPTV yu cu truyn d liu thi gian thc v s dng giao thc IP nn rt nhy cm vi mt gi v tr nu kt ni IPTV khng nhanh v gy ra v hnh nh nu d liu khng tin cy. Vn v hnh nh l vn nghim trng nu c gng truyn lung IPTV qua cc lin kt khng dy. Vic ci tin cng ngh khng dy ang c bt u to ra cc thit b gii quyt vn ny. 4 Cc module chc nng c bn ca h thng cung cp dch v IPTV/VoD 4.1 Chc nng ca cc module</p> <p>Hnh 2: Cc module chc nng c bn ca h thng IPTV Mng truy nhp bng rng H tng mng IP bng rng truyn dch v t nh cung cp dch v IPTV n khch hng. Mng truy nhp s tn dng phn h tng mng xDSL c sn. cung cp dch v vi cht lng tt v tiu th t bng thng khi c ng thi nhiu truy nhp n h thng, mng truy nhp bng rng (B-RAS/MSS v DSLAM) cn phi c h tr multicast. i vi DSLAM, ngoi h tr multicast, DSLAM cn cn h tr IGMP version 2. Ngoi ra, B-RAS/MSS v DSLAM cng cn h tr cc giao tip Ethernet chun (FE, GE). Mng cng phi c kh nng h tr QoS t u cui n u cui, m bo c bng thng cn thit v u tin cho cc knh truyn hnh qung b cng nh cc phin Video theo yu cu ang s dng (phi t c mt</p> <p>Trang 11/36</p> <p>Chuyn Tng kt cc tiu chun cho IPTV </p> <p>gi v jitter ti thiu). Bng thng xDSL do cc DSLAM cung cp n khch hng phi c kh nng ln n 4-5 Mbps. H thng cung cp ngun d liu Thu, nhn v x l cc d liu chng trnh t cc ngun khc nhau nh v tinh, truyn hnh mt t v cc ngun khc chuyn sang h thng Video Headend. H thng Video Headend Thu, iu ch v gii m ni dung hnh nh v...</p>