Introducere in DVB-H - users.utcluj.rousers.utcluj.ro/~arsinte/papers/Introducere in DVB-H.pdf ·...
Transcript of Introducere in DVB-H - users.utcluj.rousers.utcluj.ro/~arsinte/papers/Introducere in DVB-H.pdf ·...
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IntroducereIntroducere in DVBin DVB--HH
Radu Arsinte –
Universitatea Tehnica din Cluj-Napoca
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24 nov. 2012 Cluj-Napoca 2
Introducere in DVB-H
• Convergenta media digitala si comunicatiilorpermite utilizatorilor sa acceseze conţinut digital si in medii mobile
• Standardul DVB-H doreste sa asigure receptiadigitala TV in terminale mobile– Cunoscut initial ca DVB-X
• DVB-H a fost standardizat de un grup ad hoc alorganizatiei DVB – Standardizat in 2004
• DVB-H combina standardele televiziunii digitale cu elemente specifice dispozitivelor portabile : mobilitate, ecrane de dimensiune redusa, acoperire indoor si functionarea pe baterie
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Motivatia crearii DVB-H la origine
• De ce nu UMTS?– Nu este scalabila pentru livrarea de continut masiv– Pentru livrarea de continut masiv, retelele de
distributie sunt preferabile celor punct la punct
• De ce nu DVB-T?– Creat pentru receptia TV normala (fixa)– Necesitatea unui mecanism de economisire a
puterii in medii mobile– Protectie inadecvata la zgomotul in impulsuri
• De ce nu DAB?– Proiectat pentru dispozitive cu constrangeri de
putere asemanatoare, dar spectrul alocat este prea ingust
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DVB-H - “Ruda” a DVB-T
- realizat pentru distributia de servicii TV pe terminale mobile (DVB- Handheld)
- Modalitate de acces diferita
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24 nov. 2012 Cluj-Napoca 5
Un upgrade pentru DVB-T
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Evolutia DVB-H in relatie cu DVB-T
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Insertia datelor in DVB-H
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24 nov. 2012 Cluj-Napoca 8
Servicii mobile TV
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24 nov. 2012 Cluj-Napoca 9
IP Datacast (IPDC)
• “IP datacasting este un serviciu unde formatele de continut digital , aplicatiile software,interfetele de programare si serviciile multimediasunt combinate prin IP (Internet Protocol) cu difuzarea digitala.”– Tot continutul este livrat ca pachete IP
– Convergenta la nivel de strat de conectivitate
• DVB-H combinat cu IP datacasting permite distributia a variate feluri de continut digital– Transmisie TV , muzica, jocuri etc.
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Schema bloc a sistemului DVB-H
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Arhitectura IPDC peste DVB-H
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24 nov. 2012 Cluj-Napoca 12
Modurile in DVB- modulatii
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Coexistenta DVB-H cu DVB-T
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Convergenta radio mobil - DVB
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Receptor DVB-H
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Terminal mobil DVB-H
• FE = Front End, contine receptorul radio si demultiplexorul
FE
WLAN
Cellular
Link
CPU
Media
decoder Display
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Toate bune dar apare LTE
• LTE este un concurent redutabil
• Promite servicii similare de calitate si cu
interactivitate mai buna
• Parerile specialistilor merg de la disparitia totala
a DVB-H la o impartire a spectrului aplicatiilor
intre cele doua tehnologii
• De fapt sunt doua pozitii diferite: operatorii de
date care sustin teoria convergentei si
broadcasterii care cred ca convergenta totala
este o utopie
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Avantaje DVB-H
• Livrare eficienta a continutului catre o audienta larga
• Aparitie rapida pe piata• Complexitatea redusa• Nu este afectata de utilizarea in exces (in timpul
evenimentelor speciale) fata de reteaua mobila• Este posibila partajarea flexibila a fluxului de
transport intre DVB-T si DVB-H • Corespunde multor cerinte comerciale• Permite gestiunea neintrerupta• Nu este daunatoare DVB-T• IP permite criptarea
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Dezavantaje DVB-H
• Sunt posibile doar servicii bazate pe IP
• Economia de energie este neglijabila canddebitul alocat DVB-H este redus (nu sunt posibile transferuri mari)
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Concluzii
• DVB-H - un mediu alternativ de distributie media
• Orientat catre terminale mobile
• Coexista cu DVB-T si impart unele resurse
• Infrastructura poate fi utilizata in comun cu DVB
• Existenta sa este problematica dupa lansarea
LTE
• Trebuie identificate domeniile de activitate in
care avantajele sale sunt incontestabile (servicii
de date publice, urgenta, etc.)