Txij li thaum IPTV nkag mus rau hauv kev lag luam xyoo 1999, qhov kev loj hlob tau maj mam nce ntxiv. Nws xav tias cov neeg siv IPTV thoob ntiaj teb yuav ncav cuag ntau dua 26 lab tus neeg los ntawm xyoo 2008, thiab qhov kev loj hlob txhua xyoo ntawm cov neeg siv IPTV hauv Suav teb txij xyoo 2003 txog 2008 yuav ncav cuag 245%.
Raws li kev tshawb fawb, qhov kawg kilometer ntawmIPTVKev nkag mus rau hauv hom DSL cable nkag mus feem ntau siv, los ntawm bandwidth thiab kev ruaj khov thiab lwm yam, IPTV hauv kev sib tw nrog TV ib txwm muaj qhov tsis zoo, thiab hom kev nkag mus rau cable ntawm kev tsim kho ntawm tus nqi siab, lub voj voog ntev, thiab nyuaj. Yog li ntawd, yuav ua li cas daws qhov teeb meem nkag mus rau qhov kawg ntawm IPTV yog qhov tseem ceeb heev.
WiMAX (WorldwideInteroper-abilityforMicrowave Access) yog ib qho thev naus laus zis broadband wireless access raws li IEEE802.16 series ntawm cov protocols, uas maj mam dhau los ua qhov chaw tshiab rau kev tsim kho tshiab rau metro broadband wireless technology. Nws tuaj yeem hloov DSL thiab wired kev sib txuas uas twb muaj lawm los muab cov qauv ruaj khov, mobile ntawm wireless broadband kev sib txuas. Vim nws tus nqi tsim kho qis, kev ua haujlwm siab thiab kev ntseeg siab siab, nws yuav yog ib qho thev naus laus zis zoo dua los daws qhov teeb meem nkag mus kawg ntawm IPTV.
2, qhov xwm txheej tam sim no ntawm IPTV nkag mus rau thev naus laus zis
Tam sim no, cov thev naus laus zis siv dav dav los muab cov kev pabcuam IPTV suav nrog DSL ceev ceev, FTTB, FTTH thiab lwm yam thev naus laus zis nkag mus rau hauv xov hlau. Vim tias kev nqis peev tsawg hauv kev siv lub kaw lus DSL uas twb muaj lawm los txhawb cov kev pabcuam IPTV, 3/4 ntawm cov neeg teb xov tooj hauv Asia siv cov thawv teeb tsa los hloov cov teeb liab DSL mus rau hauv cov teeb liab TV los muab cov kev pabcuam IPTV.
Cov ntsiab lus tseem ceeb tshaj plaws ntawm IPTV bearer suav nrog VOD thiab cov kev pab cuam TV. Yuav kom ntseeg tau tias qhov zoo ntawm IPTV zoo ib yam li cov cable network tam sim no, IPTV bearer network yuav tsum tau muab kev lees paub hauv bandwidth, channel switching delay, network QoS, thiab lwm yam, thiab cov yam ntxwv ntawm DSL technology no tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm IPTV, thiab DSL kev txhawb nqa rau multicast yog txwv. IPv4 protocol routers, tsis txhawb multicast. Txawm hais tias theoretically tseem muaj chaw rau kev txhim kho DSL technology, muaj ob peb qhov kev hloov pauv zoo hauv bandwidth.
3, cov yam ntxwv ntawm WiMAX thev naus laus zis
WiMAX yog ib qho thev naus laus zis broadband wireless access raws li tus qauv IEEE802.16, uas yog tus qauv tshiab rau kev sib txuas lus hauv huab cua rau microwave thiab millimeter wave bands. Nws tuaj yeem muab kev sib kis mus txog 75Mbit / s, ib qho chaw nres tsheb hauv paus npog txog li 50km. WiMAX yog tsim los rau wireless LANs thiab los daws qhov teeb meem ntawm qhov kawg mais ntawm kev nkag mus rau broadband, nws yog siv los txuas Wi-Fi "hotspots" rau hauv Is Taws Nem, tab sis kuj txuas ib puag ncig ntawm lub tuam txhab lossis tsev rau kab wired backbone, uas tuaj yeem siv ua cable thiab DTH kab, thiab tuaj yeem siv ua cable thiab DTH kab. Nws kuj tseem tuaj yeem siv los txuas ib puag ncig xws li kev lag luam lossis tsev rau kab wired backbone, thiab tuaj yeem siv ua wireless txuas ntxiv rau cable thiab DSL kom ua kom muaj kev nkag mus rau wireless broadband.
4, WiMAX paub txog kev nkag mus rau IPTV wireless
(1) Cov kev cai ntawm IPTV ntawm kev nkag mus rau hauv network
Qhov tseem ceeb ntawm kev pabcuam IPTV yog nws qhov kev sib cuam tshuam thiab lub sijhawm tiag tiag. Los ntawm kev pabcuam IPTV, cov neeg siv tuaj yeem txaus siab rau cov kev pabcuam digital media zoo (ze li DVD), thiab tuaj yeem xaiv cov kev pab cuam video los ntawm broadband IP networks, ua kom muaj kev sib cuam tshuam zoo ntawm cov neeg muab kev pabcuam xov xwm thiab cov neeg siv khoom xov xwm.
Yuav kom ntseeg tau tias qhov zoo ntawm IPTV saib zoo ib yam li cov cable network tam sim no, IPTV nkag mus rau network yuav tsum muaj peev xwm muab kev lees paub txog bandwidth, channel switching latency, network QoS, thiab lwm yam. Hais txog cov neeg siv bandwidth nkag mus, kev siv cov thev naus laus zis coding uas twb muaj lawm, cov neeg siv xav tau tsawg kawg 3 ~ 4Mbit / s downlink nkag mus rau bandwidth, yog tias xa cov yeeb yaj kiab zoo dua, bandwidth xav tau kuj siab dua; hauv channel switching qeeb, txhawm rau kom ntseeg tau tias cov neeg siv IPTV hloov ntawm ntau txoj kev sib txawv thiab TV hloov pauv tib yam kev ua tau zoo, kev xa tawm dav dav ntawm IPTV cov kev pabcuam xav tau tsawg kawg digital Subscriber line access multiplexing khoom siv (DSLAM) los txhawb IP multicast technology; hais txog network QoS, kom tiv thaiv kev poob pob ntawv, jitter thiab lwm yam cuam tshuam rau qhov zoo ntawm IPTV saib.
(2) Kev sib piv ntawm txoj kev nkag mus rau WiMAX nrog DSL, Wi-Fi thiab FTTx txoj kev nkag mus
DSL, vim nws cov kev txwv txog kev siv tshuab, tseem muaj ntau yam teeb meem hais txog qhov deb, tus nqi thiab tus nqi xa tawm. Piv nrog DSL, WiMAX tuaj yeem npog thaj chaw loj dua, muab cov ntaub ntawv ceev dua, muaj peev xwm nthuav dav dua thiab QoS lav siab dua.
Piv nrog Wi-Fi, WiMAX muaj cov txiaj ntsig zoo ntawm kev npog dav dua, kev hloov pauv band dav dua, kev nthuav dav dua, QoS thiab kev ruaj ntseg siab dua, thiab lwm yam. Wi-Fi yog raws li Wireless Local Area Network (WLAN) tus qauv, thiab feem ntau yog siv rau kev nkag mus rau hauv Is Taws Nem / Intranet hauv tsev, hauv chaw ua haujlwm, lossis thaj chaw hotspot; WiMAX yog raws li Wireless WiMAX yog raws li wireless metropolitan area network (WMAN) tus qauv, uas feem ntau yog siv rau kev pabcuam nkag mus rau cov ntaub ntawv ceev ceev hauv qab cov xov tooj ntawm tes ruaj khov thiab qis ceev.
FTTB + LAN, ua ib txoj kev nkag mus rau broadband ceev ceev, uaIPTVkev pabcuam tsis muaj teeb meem ntau hauv kev siv tshuab, tab sis nws raug txwv los ntawm qhov teeb meem ntawm kev sib txuas hluav taws xob hauv lub tsev, tus nqi teeb tsa thiab qhov deb ntawm kev sib kis los ntawm cov xov hlau sib txuas. WiMAX cov yam ntxwv zoo tshaj plaws ntawm kev sib kis tsis pom kev, kev xa tawm yooj yim thiab kev teeb tsa scalability, QoS zoo heev ntawm kev pabcuam thiab kev ruaj ntseg muaj zog ua rau nws yog txoj hauv kev nkag mus zoo tshaj plaws rau IPTV.
(3) Cov txiaj ntsig ntawm WiMAX hauv kev paub txog kev nkag mus rau IPTV wireless
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. Txij li thaum Lub Tsib Hlis 2006, tus naj npawb ntawm WiMAX Forum cov tswv cuab tau nce mus txog 356, thiab ntau dua 120 tus neeg teb xov tooj thoob ntiaj teb tau koom nrog lub koom haum. WiMAX yuav yog thev naus laus zis zoo tshaj plaws los daws qhov kawg mais ntawm IPTV. WiMAX kuj tseem yuav yog lwm txoj hauv kev zoo dua rau DSL thiab Wi-Fi.
(4) Kev Paub Txog WiMAX ntawm Kev Nkag Mus Rau IPTV
Tus qauv IEEE802.16-2004 feem ntau yog tsom mus rau cov chaw ruaj khov, qhov kev sib kis siab tshaj plaws yog 7 ~ 10km, thiab nws cov kab sib txuas lus qis dua 11GHz, siv txoj kev xaiv channel, thiab bandwidth ntawm txhua channel yog ntawm 1.25 ~ 20MHz. Thaum 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 bandwidth yog 10 MHz, nws tuaj yeem muab qhov nruab nrab kis ntawm 20 Mbit / s.
WiMAX tes hauj lwm txhawb nqa cov qauv lag luam muaj yeeb yuj. Cov kev pabcuam ntaub ntawv ntawm cov nqi sib txawv yog lub hom phiaj tseem ceeb ntawm lub network. WiMAX txhawb nqa cov qib QoS sib txawv, yog li qhov kev pabcuam network muaj feem cuam tshuam nrog hom kev pabcuam. Hauv kev nkag mus rau IPTV. vim IPTV xav tau kev lees paub QoS siab thiab cov nqi xa cov ntaub ntawv ceev ceev. yog li WiMAX network tau teeb tsa tsim nyog raws li tus lej ntawm cov neeg siv hauv thaj chaw thiab lawv cov kev xav tau. Thaum cov neeg siv nkag mus rau IPTV network. Tsis tas yuav tsum nqa cov xov hlau dua, tsuas yog xav tau ntxiv WiMAX cov khoom siv tau txais thiab IP teeb tsa lub thawv, yog li cov neeg siv tuaj yeem siv IPTV kev pabcuam yooj yim thiab sai.
Tam sim no, IPTV yog ib lub lag luam tshiab uas muaj peev xwm ua lag luam zoo heev, thiab nws txoj kev loj hlob tseem nyob rau hauv nws qhov ntxov ntxov. Lub hom phiaj ntawm nws txoj kev loj hlob yav tom ntej yog kev sib koom ua ke ntawm cov kev pabcuam IPTV nrog cov davhlau ya nyob twg, thiab TV yuav dhau los ua lub davhlau ya nyob twg hauv tsev digital nrog kev sib txuas lus thiab kev ua haujlwm hauv Is Taws Nem. Tab sis IPTV kom ua tiav qhov kev tawg hauv qhov tseeb, tsis yog tsuas yog daws qhov teeb meem ntawm cov ntsiab lus xwb, tab sis kuj daws qhov teeb meem ntawm qhov kawg.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-05-2024