{"id":162,"date":"2010-11-18T11:11:14","date_gmt":"2010-11-18T10:11:14","guid":{"rendered":"https:\/\/samovar2022.int-evry.fr\/index.php\/2010\/11\/18\/soutenance-these-de-tuan-dung-nguyen\/"},"modified":"2020-09-04T18:47:17","modified_gmt":"2020-09-04T16:47:17","slug":"soutenance-these-de-tuan-dung-nguyen","status":"publish","type":"post","link":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/2010\/11\/18\/soutenance-these-de-tuan-dung-nguyen\/","title":{"rendered":"SOUTENANCE : Th\u00e8se de Tuan-Dung Nguyen"},"content":{"rendered":"

mardi 9 Novembre 2010
\n\u00ab\u00a0Evaluation de performance de la Technologie de Commutation de Paquet: Contr\u00f4le d’Acc\u00e8s, Allocation des Ressources, Gestion de QoS pour les r\u00e9seaux m\u00e9tropolitain et acc\u00e8s<\/strong>\u00ab\u00a0.<\/p>\n

La soutenance aura lieu le Mardi 09 Novembre 2010 \u00e0 T\u00e9l\u00e9com SudParis, Evry \u00e0 14h 15,
\nen salle A04.01, le pot aura lieu en F214
\ndevant le jury compos\u00e9 de:<\/p>\n

Rapporteurs:<\/strong><\/p>\n

– Mr. Harry PERROS, Professor, University NC State, USA
\nMme. Nihal PEKERGIN, Professor, University Paris-Est Cr\u00e9teil, France<\/p>\n

Examinateurs:<\/p>\n

– Mme. T\u00fclin ATMACA, Professor, T\u00e9l\u00e9com Sud Paris, France (Directrice de la th\u00e8se) <\/p>\n

– Mr. Guy PUJOLLE, Professor, University Pierre et Marie Curie Paris VI, France<\/p>\n

– Mr. Dominique CHIARONI, Team Leader, Alcatel-Lucent CIT R&I, France <\/p>\n

– Mr. Philippe GRAVEY, Professor, T\u00e9l\u00e9com Bretagne, France<\/p>\n

– Mme. Catherine LEPERS, Professor, T\u00e9l\u00e9com Sud Paris, France<\/p>\n

Abstract<\/strong><\/p>\n

The rapid growth in client application demands, in terms of bandwidth and Quality of Service (QoS), has motivated the deployment of the optical technology at Metro Access and Metro Core Networks. More diverse and more intelligent optic devices are required for efficiently management of huge capacity in the network. The explosion in demand for network bandwidth is mainly due to the growth in data traffic whose nature is also becoming more and more complex. In general, most of service-based traffics are transported in networks which are now being dominated by the optical switching technology. Nevertheless, such technology has some drawbacks such as inflexible and non-scalable properties. Optical packet switching (OPS), which offers significant benefits in terms of both network efficiency and control scalability, may overcome these limitations. This has motivated the orientation from optical circuit switching to optical packet switching in the future network infrastructure.<\/p>\n

In reality, optical packet switching ring (OPSR) networks, which combine the packet switching technology with the well-known advantages of ring topology such as fast service restoration in cases of failure and high gain of statistical traffic multiplexing over the ring, appear to be the technology of choice for the next generation of Metro Area Networks. A new OPSR architecture which is based on the all-optical infrastructure that offers intelligent features with lower cost while maximizing processing time and is now considering being replaced existing opto-electronic architectures such as Resilient Packet Ring, have been presented in the scope of the dissertation. The key element of such network is Packet Optical Add\/Drop Multiplexer (POADM) which is implemented inside a ring node, allowing the node to exploit the optical transparency. This dissertation hence focuses on the performance evaluation of the new generation of OPSR network.<\/p>\n

In this dissertation, we have investigated the performance analysis (in terms of packet delay and queue-length distribution of access nodes) of an optical synchronous bus-based metropolitan network supporting fixed-size packets. We have modeled each access node by an embedded discrete time Markov chain (EDTMC). The solution of the EDTMC allows us to compute the approximate probability that access nodes on the bus \u201csee\u201d free slots in the transit line. Using a recursive analysis technique, we approximately outline the mean waiting time of client packets coming from the upper layer as well as an approximate queue-length distribution of local buffers at access nodes in two cases: with and without QoS guarantees.<\/p>\n

To characterize the performance of an asynchronous OPSR network, we have evaluated the impact of Optical fixed-Size Packet Creation on the network performance without and with different quality of service (QoS) requirements. Performance analysis of such systems has allowed us to identify a reasonable combination of some parameters (timeslot duration, timer expiration values, profile of client traffic and network load) which may be able to improve the bandwidth utilization of the network for a given traffic matrix. The most important point that we have mentioned in the dissertation is the comparison of two architectural approaches: Variable Length \u2013 Optical Packet Format (VL-OPF) model supporting empty packets versus Fixed Length \u2013 Optical Packet Format (FL-OPF) model. In addition to CoS-Upgrade Mechanism (CUM) which is proposed to improve the filling ratio of the optical container, we have proposed a novel mechanism named Dynamic CoS-Upgrade Mechanism (DCUM) where timers are dynamically changed according to the state of the local buffer of network nodes and the traffic circulating in the network, in order to create containers with a high filling ratio while limiting the time needed for their creation. <\/p>\n

As for the access network, we have focused on the shared transmission media between end-users in Ethernet-based passive optical network (EPON). We have proposed an enhanced dynamical bandwidth allocation algorithm to address the idle period problem. The proposed algorithm calculates complementary granted bandwidth according to the arrival rate of electronic packets in a transmission cycle to facilitate the data transmission during the idle time, hence profiting from the whole network bandwidth. Finally, the behaviour of a node which interconnects two different types of the optical metro network has been investigated through a simulation of an end-to-end metropolitan network in which several rings are interconnected.<\/p>\n

R\u00e9sum\u00e9<\/strong><\/p>\n

La croissance rapide des applications interactives et ses demandes en termes de bande passante et de qualit\u00e9 de service (QoS), a motiv\u00e9 le d\u00e9ploiement de la technologie optique aux r\u00e9seaux m\u00e9tropolitains. Beaucoup de dispositifs optiques intelligents sont cr\u00e9\u00e9s pour g\u00e9rer efficacement la capacit\u00e9 \u00e9norme du r\u00e9seau. L’explosion du besoin en bande passante est principalement attribuable \u00e0 la croissance du trafic de donn\u00e9es dont la nature devient de plus en plus complexe. Actuellement, la plupart des trafics de donn\u00e9es sont transport\u00e9s dans les r\u00e9seaux qui sont domin\u00e9es par la technologie de commutation de circuit optique. N\u00e9anmoins, cette technique a quelques inconv\u00e9nients tels que les propri\u00e9t\u00e9s inflexibles. Technologie de commutation de paquets optiques (OPS), qui offre des gains significatifs en termes de capacit\u00e9 de passage \u00e0 l\u2019\u00e9chelle et d’efficacit\u00e9 de gestion des ressources du r\u00e9seau, peut surmonter ces limitations. Cela a motiv\u00e9 l’orientation de la commutation de circuit optique \u00e0 la commutation de paquet optique dans l\u2019infrastructure future du r\u00e9seau. <\/p>\n

En r\u00e9alit\u00e9, un r\u00e9seau en anneau \u00e0 commutation de paquet optique (Optical Packet Switching Ring – OPSR), qui combinent la flexibilit\u00e9 et la mise \u00e0 l\u2019\u00e9chelle de la technologie de commutation de paquet avec les avantages de la topologie en anneau tels que la restitution rapide du service en cas de panne et un bon gain de multiplexage statistique du trafic, promettraient une bonne solution pour les r\u00e9seaux MAN du future. Une nouvelle architecture du r\u00e9seau OPSR qui se base sur l\u2019infrastructure tout optique a propos\u00e9 par des \u00e9quipes de recherche chez Alcatel-Lucent. La nouvelle architecture offre des fonctions intelligentes, avec un co\u00fbt moins \u00e9lev\u00e9 en optimisant le temps de traitement. Elle est envisag\u00e9e de remplacer les architectures opto\u00e9lectroniques existantes tels que Resilient Packet Ring. L’\u00e9l\u00e9ment fondamental du r\u00e9seau est Packet Optical Add\/Drop Multiplexer (POADM) qui est impl\u00e9ment\u00e9 \u00e0 l’int\u00e9rieur des n\u0153uds d\u2019acc\u00e8s, permettant aux n\u0153uds d’exploiter la transparence optique. Cette th\u00e8se se concentre donc sur l’\u00e9valuation des performances de la nouvelle g\u00e9n\u00e9ration des r\u00e9seaux optiques m\u00e9tropolitains.<\/p>\n

Dans cette th\u00e8se, nous avons analys\u00e9 des performances (en termes de d\u00e9lais d\u2019acc\u00e8s et de la distribution du taux de l\u2019occupation au tampon local des n\u0153uds d’acc\u00e8s) d’un bus optique synchrone qui soutient des paquets \u00e0 taille fixe. Nous avons mod\u00e9lis\u00e9 chaque n\u0153ud d’acc\u00e8s par une cha\u00eene de Markov \u00e0 temps discret (EDTMC). La solution de l’EDTMC nous permet de calculer la probabilit\u00e9 approximative o\u00f9 les n\u0153uds d’acc\u00e8s dans le bus peuvent \u00ab\u00a0voir\u00a0\u00bb slots libres dans la ligne de transit. En utilisant une technique d’analyse r\u00e9cursive, nous d\u00e9duisons une formule mesurant le temps moyen d’attente des paquets du client venant de la couche sup\u00e9rieure, ainsi que la distribution du taux de l\u2019occupation au tampon local des n\u0153uds d’acc\u00e8s pour les deux cas: avec et sans garantie de la Qualit\u00e9 de Service (QoS). <\/p>\n

Pour caract\u00e9riser des performances d’un r\u00e9seau OPSR asynchrone, nous avons \u00e9valu\u00e9 l’impact de la cr\u00e9ation de containeur optique \u00e0 taille fixe sur les performances du r\u00e9seau. L\u2019analyse des performances de ce syst\u00e8me nous a permis d’identifier une combinaison raisonnable de certains param\u00e8tres (la dur\u00e9e de timeslot, les valeurs d\u2019expiration des temporisateurs, le profil du trafic client, la charge du r\u00e9seau) qui peuvent am\u00e9liorer l’utilisation de la bande passante du r\u00e9seau. Le point le plus important que nous avons mentionn\u00e9 dans la th\u00e8se est la comparaison entre deux approches architecturales: le mod\u00e8le de Variable Length – Optical Packet Format (VL-OPF) versus le mod\u00e8le de Fixed Length – Optical Packet Format (FL-OPF). En plus de Cos-Upgrade M\u00e9canisme (CUM) qui est propos\u00e9 d’am\u00e9liorer le taux de remplissage du conteneur optique, nous avons propos\u00e9 un nouveau m\u00e9canisme appel\u00e9 Dynamic Upgrade Cos-M\u00e9canisme (DCUM), o\u00f9 les valeurs des temporisateurs sont modifi\u00e9s dynamiquement en fonction de l’\u00e9tat des tampons locaux aux n\u0153uds d\u2019acc\u00e8s et le trafic circulant dans le r\u00e9seau, afin de cr\u00e9er des conteneurs optiques avec le taux de remplissage le plus \u00e9lev\u00e9 possible en limitant le temps d\u2019attente n\u00e9cessaire des paquets de client. <\/p>\n

Quant au r\u00e9seau \u00e0 l’acc\u00e8s, un algorithme d’allocation dynamique de bande passante est propos\u00e9 pour traiter le probl\u00e8me de p\u00e9riode inactive dans le r\u00e9seau d\u2019Ethernet Passive Optical Network (EPON). L’algorithme propos\u00e9 calcule la bande passante compl\u00e9mentaire en fonction du taux d’arriv\u00e9 des paquets \u00e9lectroniques dans un cycle de transmission pour faciliter la transmission de donn\u00e9es pendant le p\u00e9riode inactif, profitant donc de la bande passante tout enti\u00e8re du r\u00e9seau. Enfin, le comportement d’un noeud qui relie les deux types de r\u00e9seau m\u00e9tropolitain optique a \u00e9t\u00e9 aussi \u00e9tudi\u00e9 gr\u00e2ce \u00e0 une simulation d’un r\u00e9seau m\u00e9tropolitain de bout en bout o\u00f9 des anneaux sont interconnect\u00e9s.<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

mardi 9 Novembre 2010 \u00ab\u00a0Evaluation de performance de la Technologie de Commutation de Paquet: Contr\u00f4le d’Acc\u00e8s, Allocation des Ressources, Gestion de QoS pour les r\u00e9seaux m\u00e9tropolitain et acc\u00e8s\u00ab\u00a0. La soutenance aura lieu le Mardi 09 Novembre 2010 \u00e0 T\u00e9l\u00e9com SudParis, Evry \u00e0 14h 15, en salle A04.01, le pot aura lieu en F214 devant le […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[7],"tags":[],"class_list":["post-162","post","type-post","status-publish","format-standard","hentry","category-uncategorized-fr","entry"],"_links":{"self":[{"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/posts\/162","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/comments?post=162"}],"version-history":[{"count":1,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/posts\/162\/revisions"}],"predecessor-version":[{"id":2062,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/posts\/162\/revisions\/2062"}],"wp:attachment":[{"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/media?parent=162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/categories?post=162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/samovar.telecom-sudparis.eu\/index.php\/wp-json\/wp\/v2\/tags?post=162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}