{"id":8591,"date":"2018-11-14T09:27:12","date_gmt":"2018-11-14T08:27:12","guid":{"rendered":"http:\/\/cienciagandia.webs.upv.es\/?p=8591"},"modified":"2018-11-14T09:29:01","modified_gmt":"2018-11-14T08:29:01","slug":"investigadors-de-la-upv-desenvolupen-un-protocol-i-un-algorisme-que-millora-la-transmissio-de-video-per-internet","status":"publish","type":"post","link":"https:\/\/cienciagandia.webs.upv.es\/ca\/2018\/11\/investigadors-de-la-upv-desenvolupen-un-protocol-i-un-algorisme-que-millora-la-transmissio-de-video-per-internet\/","title":{"rendered":"Investigadors de la UPV desenvolupen un protocol i un algorisme que millora la transmissi\u00f3 de v\u00eddeo per internet"},"content":{"rendered":"

Millorar la qualitat de la transmissi\u00f3 de v\u00eddeo per internet. Aquest ha sigut l’objectiu de la investigaci\u00f3 desenvolupada en la tesi doctoral Design of an architecture and communication protocol for video transmission and videoconference<\/em><\/a> realitzada pel doctor Jos\u00e9 Miguel Jim\u00e9nez Herranz<\/strong><\/a>\u00a0i dirigida per Jaime Lloret<\/strong><\/a>, professor i investigador del Campus de Gandia de la Universitat Polit\u00e8cnica de Val\u00e8ncia (UPV).<\/strong><\/p>\n

El consum de v\u00eddeo per internet \u00e9s una tend\u00e8ncia en al\u00e7a. Segons Jim\u00e9nez, al voltant d’un 50% de la poblaci\u00f3 d’Am\u00e8rica, Europa, \u00c0sia i Oceania consumeixen di\u00e0riament v\u00eddeos per internet.<\/strong> D’altra banda, el v\u00eddeo en temps real \u00e9s clau per a nombrosos serveis, <\/strong>incloent la gesti\u00f3 empresarial, els videojocs i altres ind\u00fastries de l’entreteniment. \u2018Aix\u00f2 comporta un augment exponencial d’exig\u00e8ncia per a sistemes i xarxes i una major dificultat per a oferir una bona qualitat de l’experi\u00e8ncia<\/strong>, especialment en entorns amb recursos limitats, com les xarxes de tel\u00e8fons m\u00f2bils\u2019, afirma l’investigador.<\/p>\n

\"\"<\/p>\n

Jos\u00e9 Miguel Jim\u00e9nez Herranz i Jaime Lloret<\/em><\/p>\n

ALGORISME I PROTOCOL INNOVADORS<\/p>\n

La soluci\u00f3 proposada des del Campus de Gandia de la UPV passa pel desenvolupament d’innovadors algorismes de compressi\u00f3, que donen lloc a v\u00eddeos de la menor grand\u00e0ria possible.<\/strong> \u2018Hem creat algorismes de codificaci\u00f3 i descodificaci\u00f3 per a xarxes adaptatives, i tamb\u00e9 mecanismes de control que regulen la qualitat de l’experi\u00e8ncia des de l’inici al final del cicle; a m\u00e9s, hem dissenyat, muntat i configurat una xarxa WAN (Wide Area Network <\/em>\u2013 les utilitzades per operadors o governs); tamb\u00e9 hem implementat proves de rendiment per a mesurar els par\u00e0metres de variacions en la qualitat del servei de la xarxa i l’impacte en qualitat de la imatge generat per la variaci\u00f3 d’aquests par\u00e0metres\u2019, explica Jim\u00e9nez.<\/p>\n

\u2018Proposem un<\/strong> protocol de comunicaci\u00f3 i una algorisme que permeten a l’operador garantir un bon servei d’IPTV<\/strong> (televisi\u00f3 per internet, entre altres utilitats), ajustant la qualitat del v\u00eddeo al dispositiu utilitzat i a l’amplada de banda contractada pel client, de manera que aquest tinga la millor experi\u00e8ncia possible. Hem estudiat diferents codificacions, tenint en compte la taxa de bits i el temps de codificaci\u00f3, per a xarxes heterog\u00e8nies i utilitzant el llenguatge de programaci\u00f3 HTML5\u2019, continua l’investigador.<\/p>\n

\u2018Aquesta informaci\u00f3 s’ha utilitzat per a dissenyar un algorisme que controla el servidor i envia el tipus de v\u00eddeo apropiat a les caracter\u00edstiques detectades. El sistema est\u00e0 pensat per a utilitzar-se en aplicacions com el v\u00eddeo \u2013 xat d’alta qualitat, bidireccional i a temps real, aix\u00ed com per a la interacci\u00f3 m\u00faltiple a trav\u00e9s de navegadors de dispositius m\u00f2bils, aplicacions o jocs\u2019, finalitza Jim\u00e9nez.<\/p>\n

APLICACI\u00d3 A LA VIDEOCONFER\u00c8NCIA<\/p>\n

Els investigadors han demostrat els avantatges de l’algorisme i protocol per a aquesta fi. \u2018Encara que el consum de banda ampla pot ser major que el que es d\u00f3na en les solucions comercials ja establides, els prototips presentats mostren una flexibilitat major per a adaptar-se a un ampli rang de dispositius m\u00f2bils i plataformes de xarxa\u2019<\/strong>, explica el doctor en telecomunicacions.<\/p>\n

\"\"<\/p>\n

Segons l’enginyer de telecomunicacions Jos\u00e9 Miguel Jim\u00e9nez, les xarxes actuals presenten grans limitacions degudes a la rigidesa de configuraci\u00f3 motivada per l’\u00fas de sistemes basats en comandaments est\u00e0tics<\/strong>. D’altra banda, la virtualitzaci\u00f3 i \u00fas de tecnologies allotjades en el n\u00favol estan canviant els patrons de tr\u00e0nsit en la xarxa i els centres de dades<\/strong>. Per a solucionar aquests problemes, els administradors de xarxa tradicionalment implementen solucions basades en la substituci\u00f3 d’infraestructures f\u00edsiques o redistribuci\u00f3 de la c\u00e0rrega, la qual cosa implica un alt cost del manteniment de les xarxes; d’altra banda, els qui administren les xarxes no solen tindre els recursos necessaris per a optimitzar instant\u00e0niament el servei segons la demanda i oferir aix\u00ed un servei satisfactori.<\/p>\n

Per aix\u00f2, la soluci\u00f3 proposada per Jos\u00e9 Miguel Jim\u00e9nez i Jaime Lloret es basa en la posada en marxa de xarxes que s’adapten a les situacions<\/strong>, a trav\u00e9s d’agents que aprenen<\/strong>; aquests agents automatitzats estan connectats, comparteixen informaci\u00f3 i cooperen per a aconseguir una distribuci\u00f3 optimitzada en temps real.<\/p>\n

Jim\u00e9nez explica a m\u00e9s que la transmissi\u00f3 de v\u00eddeo requereix una gran amplada de banda. \u2018La congesti\u00f3 de les xarxes redueix l’amplada i repercuteix en p\u00e8rdues de paquets d’informaci\u00f3, en propagaci\u00f3 d’errors i en retards; aix\u00f2 pot causar una degradaci\u00f3 de la qualitat del v\u00eddeo, la congelaci\u00f3 de frames<\/em> i errors en l’\u00e0udio durant la comunicaci\u00f3 en temps real\u2019.<\/p>\n

\n

Sandra Barrancos Gregori<\/a><\/strong><\/p>\n

T\u00e8cnica\u00a0de comunicaci\u00f3\u00a0i\u00a0m\u00e0rqueting\u00a0del Campus de Gandia.<\/p>\n","protected":false},"excerpt":{"rendered":"

Millorar la qualitat de la transmissi\u00f3 de v\u00eddeo per internet. Aquest ha sigut l’objectiu de la investigaci\u00f3 desenvolupada en la tesi doctoral Design of an … Llegir m\u00e9s<\/a><\/p>\n","protected":false},"author":9,"featured_media":8602,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[252],"tags":[706],"class_list":["post-8591","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tecnologia","tag-destacat-ca","resize-featured-image"],"yoast_head":"\nInvestigadors de la UPV desenvolupen un protocol i un algorisme que millora la transmissi\u00f3 de v\u00eddeo per internet - Campus de Gandia Ciencia - UPV Universitat Polit\u00e8cnica de Val\u00e8ncia<\/title>\n<meta name=\"description\" content=\"El consum de v\u00eddeo per Internet \u00e9s una tend\u00e8ncia en augment: a Europa, Am\u00e8rica, \u00c0sia i Oceania, un 50% de la poblaci\u00f3 afirma consumir di\u00e0riament v\u00eddeos online\" \/>\n<meta name=\"robots\" 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