Txij li thaum IPTV nkag mus rau hauv kev ua lag luam hauv xyoo 1999, qhov kev loj hlob tau maj mam nce. Nws xav tias thoob ntiaj teb IPTV cov neeg siv yuav ncav cuag ntau dua 26 lab los ntawm 2008, thiab qhov sib xyaw ua ke txhua xyoo kev loj hlob ntawm IPTV cov neeg siv hauv Suav teb los ntawm 2003 txog 2008 yuav ncav cuag 245%.
Raws li kev soj ntsuam, lub xeem kilometers ntawmIPTVKev nkag mus siv feem ntau yog siv hauv DSL cable nkag hom, los ntawm bandwidth thiab kev ruaj ntseg thiab lwm yam, IPTV hauv kev sib tw nrog cov TV zoo tib yam yog qhov tsis zoo, thiab kev siv cable siv hom kev tsim kho tus nqi yog siab, lub voj voog ntev, thiab nyuaj. Yog li ntawd, yuav ua li cas los daws qhov teeb meem nkag mus hauv mais kawg ntawm IPTV yog qhov tseem ceeb tshwj xeeb.
WiMAX (WorldwideInteroper-abilityforMicrowave Access) yog broadband wireless nkag siv thev naus laus zis raws li IEEE802.16 series ntawm cov txheej txheem, uas tau maj mam dhau los ua qhov kev loj hlob tshiab hotspot rau metro broadband wireless technology. Nws tuaj yeem hloov qhov DSL thiab cov kev sib txuas uas twb muaj lawm los muab cov ntaub ntawv ruaj khov, cov ntaub ntawv txawb ntawm kev sib txuas wireless. Vim nws cov nqi tsim kho qis, kev ua haujlwm siab thiab kev ntseeg siab, nws yuav yog ib qho cuab yeej zoo dua los daws qhov teeb meem ntawm kev nkag mus rau IPTV kawg.
2, qhov teeb meem tam sim no ntawm IPTV nkag tshuab
Tam sim no, cov cuab yeej siv dav dav siv los muab cov kev pabcuam IPTV suav nrog kev kub ceev DSL, FTTB, FTTH thiab lwm yam kev siv xov tooj cua. Vim tias kev nqis peev tsawg hauv kev siv DSL system uas twb muaj lawm los txhawb IPTV cov kev pabcuam, 3/4 ntawm cov neeg siv xov tooj hauv Asia siv lub thawv teeb tsa los hloov DSL cov teeb liab rau hauv TV teeb liab los muab kev pabcuam IPTV.
Cov ntsiab lus tseem ceeb tshaj plaws ntawm IPTV tus tuav ntaub ntawv suav nrog VOD thiab TV program. Txhawm rau kom ntseeg tau tias qhov kev pom zoo ntawm IPTV yog qhov sib piv rau cov kab ke tam sim no, IPTV tus neeg tuav lub network yuav tsum tau muab kev lees paub hauv bandwidth, channel hloov ncua ncua, network QoS, thiab lwm yam, thiab cov yam ntxwv ntawm DSL thev naus laus zis tsis tuaj yeem. kom ua tau raws li qhov yuav tsum tau muaj ntawm IPTV, thiab DSL kev txhawb nqa rau multicast yog txwv. IPv4 raws tu qauv routers, tsis txhawb multicast. Txawm hais tias qhov theoretically tseem muaj chaw rau kev kho dua tshiab DSL thev naus laus zis, muaj qee qhov kev hloov pauv hauv bandwidth.
3, tus yam ntxwv ntawm WiMAX technology
WiMAX yog ib qho kev siv tshuab dav hlau siv dav hlau raws li IEEE802.16 tus qauv, uas yog tus qauv huab cua tshiab uas tau thov rau microwave thiab millimeter yoj bands. Nws tuaj yeem muab tau txog li 75Mbit / s kis tau tus mob, ib qho chaw nres tsheb npog txog li 50km. WiMAX yog tsim los rau wireless LANs thiab los daws qhov teeb meem ntawm mais kawg ntawm kev siv dav dav, nws yog siv los txuas Wi-Fi "hotspots" mus rau Is Taws Nem, tab sis kuj tseem txuas rau ib puag ncig ntawm lub tuam txhab lossis lub tsev mus rau lub pob txha qaum. , uas yuav siv tau raws li ib tug cable thiab ib tug DTH kab, thiab yuav siv tau raws li lub cable thiab DTH kab. Nws kuj tseem tuaj yeem siv los txuas cov chaw ib puag ncig xws li kev lag luam lossis tsev mus rau lub nraub qaum qaum, thiab tuaj yeem siv los ua lub wireless txuas ntxiv rau cable thiab DSL kom pab tau wireless broadband nkag.
4, WiMAX paub wireless nkag ntawm IPTV
(1) Kev xav tau ntawm IPTV ntawm kev nkag mus rau lub network
Lub ntsiab feature ntawm IPTV kev pab cuam yog nws kev sib tham sib thiab lub sij hawm. Los ntawm kev pabcuam IPTV, cov neeg siv tuaj yeem txaus siab rau qhov zoo (ze rau qib DVD) cov kev pabcuam digital media, thiab tuaj yeem xaiv cov kev pabcuam video los ntawm broadband IP networks, paub txog kev sib cuam tshuam ntawm cov chaw muab kev pabcuam thiab cov neeg siv xov xwm.
Txhawm rau kom ntseeg tau tias qhov kev pom zoo ntawm IPTV yog qhov sib piv rau cov xov tooj cua tam sim no, IPTV nkag mus rau lub network yuav tsum muaj peev xwm muab kev lees paub ntawm bandwidth, channel hloov latency, network QoS, thiab lwm yam. Nyob rau hauv cov nqe lus ntawm cov neeg siv kev nkag bandwidth, kev siv cov cuab yeej siv coding uas twb muaj lawm, cov neeg siv xav tau tsawg kawg yog 3 ~ 4Mbit / s downlink nkag bandwidth, yog tias kev sib kis ntawm cov yeeb yaj kiab zoo dua, qhov xav tau bandwidth kuj tseem siab dua; nyob rau hauv cov channel hloov ncua qeeb, txhawm rau kom ntseeg tau tias IPTV cov neeg siv hloov pauv ntawm cov channel sib txawv thiab TV zoo tib yam hloov pauv qhov ua tau zoo, kev xa tawm dav dav ntawm IPTV cov kev pabcuam yuav tsum muaj tsawg kawg yog cov neeg siv cov kab nkag mus rau multiplexing khoom (DSLAM) los txhawb IP multicast technology; nyob rau hauv cov nqe lus ntawm network QoS, los tiv thaiv pob ntawv poob, jitter thiab lwm yam cuam tshuam rau qhov zoo ntawm IPTV saib.
(2) Kev sib piv ntawm WiMAX txoj kev nkag nrog DSL, Wi-Fi thiab FTTx txoj kev nkag
DSL, vim nws tus kheej cov kev txwv, tseem muaj ntau yam teeb meem ntawm kev ncua deb, tus nqi thiab tus nqi tawm. Piv nrog rau DSL, WiMAX tuaj yeem theoretically npog thaj tsam loj dua, muab cov ntaub ntawv ceev dua, muaj peev xwm loj dua thiab ntau dua QoS lav.
Piv nrog Wi-Fi, WiMAX muaj qhov zoo tshaj plaws ntawm cov kev pab cuam dav dav, dav band adaptation, muaj zog scalability, siab dua QoS thiab kev ruaj ntseg, thiab lwm yam. Wi-Fi yog raws li Wireless Local Area Network (WLAN) tus qauv, thiab feem ntau yog siv rau Kev sib thooj-kev faib tawm hauv Internet/Intranet nkag rau hauv tsev, hauv chaw ua haujlwm, lossis chaw hotspot; WiMAX yog raws li lub wireless WiMAX yog raws li wireless cheeb tsam cheeb tsam network (WMAN) tus qauv, uas yog tsuas yog siv rau high-ceev cov ntaub ntawv kev pab cuam nyob rau hauv tas li thiab tsis-ceev mobile.
FTTB + LAN, raws li txoj kev siv hluav taws xob nrawm nrawm, ua tiavIPTVkev pab cuam tsis muaj teeb meem ntau technically, tab sis nws yog txwv los ntawm qhov teeb meem ntawm kev sib txuas hauv lub tsev, tus nqi installation thiab kis tau tus mob los ntawm kev sib tw-pair cable. WiMAX qhov zoo tshaj plaws uas tsis yog-kab-ntawm-pob qhov muag kis tus yam ntxwv, hloov tau yooj yim xa mus thiab teeb tsa scalability, zoo QoS zoo ntawm kev pabcuam thiab kev ruaj ntseg zoo tag nrho ua rau nws yog txoj hauv kev zoo tshaj plaws rau IPTV.
(3) Qhov zoo ntawm WiMAX hauv kev paub txog wireless nkag mus rau IPTV
Los ntawm kev sib piv WiMAX nrog DSL, Wi-Fi thiab FTTx, nws tuaj yeem pom tias WiMAX yog qhov kev xaiv zoo dua hauv kev nkag mus rau IPTV. Raws li lub Tsib Hlis 2006, tus naj npawb ntawm WiMAX Forum cov tswv cuab tau nce mus rau 356, thiab ntau dua 120 tus neeg ua haujlwm thoob ntiaj teb tau koom nrog lub koom haum. WiMAX yuav yog cov cuab yeej zoo tshaj plaws los daws qhov mais kawg ntawm IPTV. WiMAX tseem yuav yog lwm txoj hauv kev zoo dua rau DSL thiab Wi-Fi.
(4) WiMAX Realization ntawm IPTV Access
IEEE802.16-2004 tus qauv feem ntau yog taw qhia rau cov terminals ruaj khov, qhov siab tshaj plaws kis tau tus mob yog 7 ~ 10km, thiab nws txoj kev sib txuas lus qis dua 11GHz, siv txoj kev xaiv channel, thiab bandwidth ntawm txhua channel yog nyob nruab nrab ntawm 1.25 ~ 20MHz. Thaum lub bandwidth yog 20 MHz, qhov siab tshaj plaws ntawm IEEE 802.16a tuaj yeem ncav cuag 75 Mbit / s, feem ntau 40 Mbit / s; Thaum lub bandwidth yog 10 MHz, nws tuaj yeem muab qhov nruab nrab kis tau tus nqi ntawm 20 Mbit / s.
WiMAX tes hauj lwm txhawb kev ua lag luam muaj yeeb yuj. Cov kev pabcuam cov ntaub ntawv ntawm cov nqi sib txawv yog lub hom phiaj tseem ceeb ntawm lub network.WiMAX txhawb nqa qib QoS sib txawv, yog li cov kev pabcuam hauv lub network yog ze ze rau hom kev pabcuam. Raws li kev nkag mus rau IPTV. vim IPTV xav tau QoS kev ruaj ntseg siab thiab cov ntaub ntawv xa mus ceev ceev. yog li WiMAX network tau teeb tsa tsim nyog raws li tus naj npawb ntawm cov neeg siv hauv cheeb tsam thiab lawv cov kev xav tau. Thaum cov neeg siv nkag mus rau IPTV network. Tsis tas yuav ua cov xaim txuas ntxiv, tsuas yog yuav tsum tau ntxiv WiMAX cov cuab yeej txais thiab IP teeb tsa lub thawv, yog li cov neeg siv tuaj yeem siv IPTV kev pabcuam yooj yim thiab nrawm.
Tam sim no, IPTV yog kev lag luam tawm tshiab nrog kev ua lag luam zoo, thiab nws txoj kev loj hlob tseem nyob hauv nws cov me nyuam mos. Qhov sib txawv ntawm nws txoj kev loj hlob yav tom ntej yog los txuas ntxiv cov kev pabcuam IPTV nrog cov davhlau ya nyob twg, thiab TV yuav dhau los ua qhov chaw dav dav hauv tsev nrog kev sib txuas lus thiab kev ua haujlwm hauv Is Taws Nem. Tab sis IPTV kom ua tiav qhov kev nkag siab ntawm qhov tseeb, tsis yog tsuas yog daws cov teeb meem ntawm cov ntsiab lus, tab sis kuj los daws qhov fwj ntawm qhov kawg mais.
Post lub sij hawm: Dec-05-2024