Kablosuz mobil tasarsız ağlarda gerçek zamanlı trafik desteği veren bağ durumu tabanlı isteğe dayalı yol atama protokolü

Wireless ad hoc networks have gained a lot of popularity since their intro-duction and as many wireless network interface cards provide support for ad hocnetworking, such networks have also seen real-life deployment for non-specializedpurposes. Wireless mobile ad hoc networks (MANETs) are currently the mostcommon type of ad hoc networks, and such networks are especially esteemed fortheir mobility support and ease of deployment due to their ad hoc nature. Asmost common network applications, such as the Web, FTP, email, and instantmessaging, are data-centric and do not operate under strict time constraints,MANETs have been deployed to enable such non-real-time applications in thepast. However, with the increasing use of real-time applications over ad hocnetworks, such as teleconferencing, VoIP, and security and tracking applicationswhere timeliness is of importance, real-time traffic support in multi-hop wirelessmobile ad hoc networks has become an issue.We propose an event-driven, link-state based, on-demand routing protocol toenable real-time traffic support in such multi-hop wireless mobile ad hoc net-works. Our protocol, which is named Elessar, is based on link-state topologydissemination, but instead of the more common periodic link-state messagingscheme, we employ event-driven link-state messages in Elessar, where topologychanges are the events of interest. Through such an approach, we aim to lower theoverhead of our protocol, especially for low-mobility cases, which is currently themost commonly encountered case with ad hoc networks deployed with machinesdirectly interacting with humans, such as PDAs and laptops. Due to its link-statenature, our protocol is able to support non-real-time traffic without any furtheraction. In order to support real-time traffic, however, we employ a direct costiiiivdissemination mechanism, which only operates on-demand when there are one ormore real-time flows in the network. We aim to provide soft quality-of-service(QoS) guarantees to real-time flows through intelligent path selection, withoutany resource reservation. We also aim to provide such QoS guarantees through-out the lifetime of a real-time flow, even in the face of node failures and mobility,by dynamic path adaptation during the lifetime of the flow. Elessar is able tosupport real-time and non-real-time traffic concurrently, as well as various differ-ent types of concurrent real-time traffic, such as delay- and loss-sensitive traffic.Our protocol, therefore, does not aim to support a single type of real-time traffic,but rather a plethora of different types of real-time traffic. Elessar is completelydistributed, dynamic and adaptive, and does not require the underlying MACprotocol to be QoS-aware.We analyse our design choices and the performance of our protocol throughrealistic simulation experiments conducted on the OMNeT++ discrete event sim-ulation platform, using the INET framework. We have used the IEEE 802.11bMAC protocol during our simulations and have employed the random waypointmobility model to simulate mobility. Our experimental results show that Elessaris able to efficiently provide real-time traffic support for different types of traf-fic flows, even in the face of mobility. Our protocol operates best for small-to-medium-sized networks where mobility rates are low-to-medium. Once themobility rate exceeds a certain threshold, intelligent path selection cannot copesatisfactorily with the high dynamism of the environment and the overhead ofElessar exceeds acceptable levels due to its event-driven link-state nature.Keywords: Wireless ad hoc networks, routing protocol, real-time traffic support,quality-of-service (QoS).