In this paper, we propose effective routing protocols that avoid congestion. The mechanism we propose for congestion-avoidance is based on the selection of the least congested routes as they are discovered, instead of the shortest ones. Using simulations, the proposed route discovery algorithms have achieved better packet delivery ratio (up to 11% improvement) as compared with the AODV routing ...

This paper proposes and investigates a statistical approach to detect the NAV attack in MAC layer. We present simulation and analytical results showing that the NAV attack can under perform the standard 802.11 MAC protocol. Further no approach has been explicitly specified to detect this attack. This approach is a simpler method to detect NAV attack using Glomosim simulator. In this work we inv...

Advances in Wireless Sensor Network Technology (WSN) has provided the availability of small and low-cost sensor with capability of sensing various types of physical and environmental conditions, data processing and wireless communication. One of the most challenging issues so far is the extension of network lifetime with regards to small battery capacity and self-sustained operation. Endeavors ...

W e introduce and discuss a methodology f o r heterogeneous simulations of computer networks using the dynamic simulation backplane. This methodology allows for exchanging of protocol information between simulators across layers of the protocol stack. For example, the simulationist m a y wish to construct a simulation using the rich set of T C P models found in the ns network simulator, and at ...

We describe enhancements to the IEEE 802.11 DCF MAC Protocol which enable nodes to identify themselves as exposed nodes and to opportunistically schedule concurrent transmissions whenever possible, thereby improving utilization and mitigating the exposed node problem. The algorithm makes minimal changes to the IEEE 802.11 MAC protocol. It does not require the introduction of new frame types or ...

This paper compares Ad hoc On-demand Distance Vector (AODV), Dynamic Source Routing (DSR), and Wireless Routing Protocol (WRP) for MANETs to Distance Vector protocol to better understand the major characteristics of the three routing protocols, using a parallel discrete event-driven simulator, GloMoSim. MANET (mobile ad hoc network) is a multi-hop wireless network without a fixed infrastructure...

IEEE 802.11 Wireless Local Area Network (WLAN) is one of the most widely deployed wireless network technologies in the world today. The success of IEEE 802.11 mainly owes to its cost effectiveness, easy deployment and high data transmission rates. However, 802.11 MAC (Medium Access Control) algorithm is unable to support modern multimedia applications which require certain level of quality of s...

In this paper, we utilize the Several interference revelation techniques proposed for mobile ad hoc networks rely on each node passively monitoring the data forwarding by its next hop. This paper presents quantitative evaluations of false positives and their impact on monitoring based interference revelation for ad hoc networks. Experimental results show that, even for a simple three-node confi...

In the past two decades, we have seen a rapid development in the area of mobile computing and communications due to the explosion of inexpensive, broadly available wireless devices. A mobile ad hoc network is an independent collection of mobile devices that communicate with each other over wireless links and cooperate in a distributed manner in order to provide the necessary network functionali...