{"id":37472,"date":"2019-07-18T10:41:42","date_gmt":"2019-07-18T08:41:42","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=37472"},"modified":"2019-07-18T11:30:47","modified_gmt":"2019-07-18T09:30:47","slug":"contribution-a-lamelioration-des-transmissions-video-dans-les-reseaux-ad-hoc-vehiculaires-vanet","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/these\/contribution-a-lamelioration-des-transmissions-video-dans-les-reseaux-ad-hoc-vehiculaires-vanet.html","title":{"rendered":"Contribution \u00e0 l\u2019am\u00e9lioration des transmissions vid\u00e9o dans les r\u00e9seaux ad-hoc v\u00e9hiculaires (VANET)"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-upvbxc-f10b6799a31d846bdbe4119b92a84562\">\n.flex_column.av-upvbxc-f10b6799a31d846bdbe4119b92a84562{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-upvbxc-f10b6799a31d846bdbe4119b92a84562 av_one_full  avia-builder-el-0  avia-builder-el-no-sibling  first flex_column_div av-zero-column-padding'     ><section  class='av_textblock_section av-jy8fdthr-3f7547e512468f756f4f77c7a0eeb7cf'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><blockquote>\n<h4><strong><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-14684 alignleft\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_-80x80.png\" alt=\"\" width=\"80\" height=\"80\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_-80x80.png 80w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_-36x36.png 36w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_-180x180.png 180w\" sizes=\"auto, (max-width: 80px) 100vw, 80px\" \/><\/a>Mohamed Aymen <\/strong><strong>LABIOD <\/strong><\/h4>\n<p>Thesis defence<br \/>\n05\/07\/2019<br \/>\nPolytechnic University of Hauts-de-France<\/p>\n<\/blockquote>\n<h4><strong><br \/>\nSummary:<\/strong><\/h4>\n<p>Actuellement les communications v\u00e9hiculaires sont devenues une r\u00e9alit\u00e9 guid\u00e9e par diverses applications. Notamment, la diffusion de vid\u00e9o de qualit\u00e9 \u00e9lev\u00e9e avec des contraintes de faible latence requises par les applications temps r\u00e9el. Gr\u00e2ce au niveau de compression jamais atteint auparavant, l\u2019encodeur H.265\/HEVC est tr\u00e8s prometteur pour la diffusion de vid\u00e9os en temps r\u00e9el dans les r\u00e9seaux ad hoc v\u00e9hiculaire (VANET). N\u00e9anmoins, la qualit\u00e9 de la vid\u00e9o re\u00e7ue est p\u00e9nalis\u00e9e par les mauvaises caract\u00e9ristiques du canal de transmission (disponibilit\u00e9, non stationnarit\u00e9, rapport signal \u00e0 bruit, etc.). Afin d\u2019am\u00e9liorer et d\u2019assurer une qualit\u00e9 vid\u00e9o minimale \u00e0 la r\u00e9ception nous proposons dans ce travail une optimisation conjointe source-canal-protocole de la transmission en tenant compte \u00e0 la fois des param\u00e8tres de transmission et d\u2019encodage vid\u00e9o.<\/p>\n<p>Dans un premier temps, nous montrons l\u2019int\u00e9r\u00eat et le gain apport\u00e9 par les solutions dites inter-couches \u00ab cross layer \u00bb. Par la suite, nous d\u00e9veloppons deux approches l\u2019une exploitant un \u00ab cross layer \u00bb entre la couche application et la couche MAC et une seconde exploitant les protocoles de transports dans l\u2019adaptation du flux vid\u00e9o. En ce qui concerne la premi\u00e8re approche nous proposons une solution utilisant une gestion hi\u00e9rarchique des trames au niveau des files d\u2019attentes de la couche MAC, bas\u00e9e sur l\u2019importance des images du flux vid\u00e9o. Dans une seconde solution, nous retenons le codage par descriptions multiples comme solution de protection \u00e0 la source. Les r\u00e9sultats de simulations obtenus pour plusieurs types de sc\u00e9narios v\u00e9hiculaires r\u00e9alistes montrent que les diff\u00e9rents sch\u00e9mas de transmission v\u00e9hiculaire propos\u00e9s offrent des am\u00e9liorations significatives en termes de qualit\u00e9 vid\u00e9o \u00e0 la r\u00e9ception et de retard de bout en bout par rapport aux sch\u00e9mas classiques.<\/p>\n<h4><strong>JURY :<\/strong><\/h4>\n<p>- Ms SERIR A., Professor at the University of Algiers, Algeria<\/p>\n<p>- M.MELLOUK A., Professor at the University of Paris-Est Cr\u00e9teil Val-de-Marne<\/p>\n<p>- M.BITAM S. Professor at the University of Biskra - Algeria<\/p>\n<p>- Ms MOKRAOUI A., Professor at the University of Paris 13 - L2TI<\/p>\n<p>- M.DOGHMANE N., Professor at the University of Annaba - LASA - Annaba - Algeria<\/p>\n<p>- M.COUDOUX F.-X . Professor at the Universit\u00e9 Polytechnique Hauts-de-France - IEMN DOAE<\/p>\n<p>- M.CORLAY P., Professor at the Universit\u00e9 Polytechnique Hauts-de-France-IEMN DOAE, Guest speaker<\/p>\n<p>- M.GHARBI M., Senior Lecturer at the Universit\u00e9 Polytechnique Hauts-de-France-IEMN DOAE, Guest speaker<\/p>\n<\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[199],"tags":[],"class_list":["post-37472","post","type-post","status-publish","format-standard","hentry","category-these"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/37472","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=37472"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/37472\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=37472"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=37472"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=37472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}