{"id":92014,"date":"2009-02-03T00:00:00","date_gmt":"2009-02-03T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/contribution-to-provide-qos-over-mobile-ad-hoc-networks-for-video-streaming-services-based-on-adaptive-cross-layer-architecture\/"},"modified":"2009-02-03T00:00:00","modified_gmt":"2009-02-03T00:00:00","slug":"contribution-to-provide-qos-over-mobile-ad-hoc-networks-for-video-streaming-services-based-on-adaptive-cross-layer-architecture","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/radiocomunicaciones\/contribution-to-provide-qos-over-mobile-ad-hoc-networks-for-video-streaming-services-based-on-adaptive-cross-layer-architecture\/","title":{"rendered":"Contribution to provide qos over mobile ad hoc networks for video-streaming services based on adaptive cross-layer architecture"},"content":{"rendered":"<h2>Tesis doctoral de <strong> V\u00edctor Carrascal Frias <\/strong><\/h2>\n<p>Mobile ad hoc networks (manets) are a special kind of wireless networks which allow a group of mobile nodes to  set  up and maintain a  temporary network by  themselves,  without   the support  of  any  fixed  infrastructure.  These  networks   are  useful   for   situations  which   require   a  rapid   deployment   in   an  infrastructureless   location,   or   under  emergency situations where communications are not available. They can be used in a large variety of scenarios, such  as campus, museums, emergency rescues, and exploration missions. wireless networks are nowadays one of the most spread communication technologies.  The demand of multimedia  services over wireless networks, such as video on demand (vod) or voice over ip (voip), has experienced a huge  increase over last years. These multimedia services have certain quality of service (qos) requirements which have to  be accomplished. The amount of devices capable of maintaining wireless transmissions has grown as well. These  features  lead  to a promising situation where  the delivering of  multimedia  contents  to mobile users  through  the  establishment of manets can open new markets and services. Thus, the provision of qos to the user over these  networks must  be a reality  to success  in  the deployment  of manets. Nonetheless,  the inherent   features of  these  networks make this issue certainly complicated. Since nodes are mobile, the network topology may change rapidly  and  unpredictably   throughout   time.  Node  mobility,   short-life  batteries,   time-varying  link   capacity  and   a  dynamic  topology make the problem of providing qos over manets rather complex and challenging. nodes can act as hosts or as routers to forward data from one node to another node not reachable in one hop. As  they can move freely through the network, it is common to have link breakages, so alternative paths must be provided  quickly. Furthermore, more stable and reliable paths should be preferred instead of just the shortest one. the main objective of this thesis has been to develop new techniques, and to combine existing ones, to improve the  performance of  multimedia services over  wireless ad hoc networks,   focusing on  the provision of  video-streaming  services over  manets.  Aspects such as  multipath  routing,  network state monitoring,  video characteristics,  path  classification, dynamic self-configuration, life-time of the routes, trust and reliability of the nodes within the forwarding  paths, among others aspects, have been tackled. we have designed an structure  for  manet networks  that   includes  the mmdsr  (multipath multimedia dynamic  source routing) protocol, especially designed to improve the provision of vod services over manets. Mmdsr is a  routing protocol  able  to establish multiple paths simultaneously between  two nodes.  The development  has been  based on an optimized cross-layer  design,   thus different   layers of   the protocol  stack coordinate  their  actions  to  globally   optimize   the   network   benefits.  The   proposal   includes   dynamic  mechanisms   of   autoconfiguration  which  depend on  the network  state.  This dynamic  behaviour   is  very  relevant   for  manets,  as  they are very dynamic  environments with scarce resources. Also, an improvement of the medium access mechanism of ieee 802.11e has  been proposed, diminishing probabilities of collision. The proposal also includes algorithms that take into account the  node  reliability,   to promote higher  cooperation among nodes  to  improve overall  performance of  manets.  Also,  a  game-theoretical scheme has been incorporated to the routing algorithm to share resources among competing nodes  maximising the whole benefit. An analytical model to estimate the route life-time has also been developed. It helps in a  proactive way the routing schemes to take the proper decisions at precise moments. Different scenarios have been  studied   and   simulation   results   of  multiple   video-streaming   flows   over   manets   have   shown   to   improve   the  performance of   the network compared  to basic schemes such as plain dsr  (dynamic source routing),  among  others.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Contribution to provide qos over mobile ad hoc networks for video-streaming services based on adaptive cross-layer architecture<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Contribution to provide qos over mobile ad hoc networks for video-streaming services based on adaptive cross-layer architecture <\/li>\n<li><strong>Autor:<\/strong>\u00a0 V\u00edctor Carrascal Frias <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 02\/03\/2009<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>M\u00f3nica Aguilar Igartua<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: emilio San vicente gargallo <\/li>\n<li>Marta Solera delgado (vocal)<\/li>\n<li>\u00c1lvaro Suarez sarmiento (vocal)<\/li>\n<li>Mar\u00eda  del carmen Aguayo torres (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de V\u00edctor Carrascal Frias Mobile ad hoc networks (manets) are a special kind of wireless networks which allow 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