A quick termination detection protocol by reducing overload for mobile ad hoc networks

An ad hoc network is characterized by the fact that there is no fixed topology due to the mobility of nodes, interference, multipath propagation and path loss. Execution of applications in such kind of networks typically consists of a number of successive phases such as network reprogramming, localization, power monitoring, and parameter updates. Termination detection of a phase is therefore a critical operation to safely execute a new phase on some or all of the network nodes. In resource constrained network environment the overhead should be minimum in order to increase throughput and minimize delay. This paper studies the existing solutions for termination detection by analyzing their effectiveness. Moreover, in this paper, we propose an efficient algorithmic solution to encounter termination detection by minimizing the network overloads

TCP Performance Over Mobile IP Wired-cum-Wireless Networks

Reliable transport protocol like TCP has served well the wired Internet where the packet losses are mainly due to congestion but is not ready for Mobile IP wired-cum-wireless environments where the significant packet losses are due to bit errors and handoffs In this paper we have investigated the performance of TCP among the various TCP variants We have observed both TCP senders Newreno Vegas and TCP receivers Base Delayed-Ack Using ns-2 we have evaluated the TCP throughput and packet delay over a single TCP connection The simulation results suggest that a particular combination one TCP sender with one TCP receiver of TCP shows the best result in such Mobile IP network

Synthesis, testing and tolerance in reversible logic

In recent years, reversible computing has established itself as a promising research area and emerging technology. This thesis focuses on three important areas of reversible logic, which is an area of reversible computing. Firstly, this thesis proposes a transformation based synthesis approach for realizing conservative reversible functions using SWAP and Fredkin gates. This thesis also proposes ten templates for optimizing SWAP and Fredkin gates-based reversible circuits. Secondly, this thesis proposes an approach for the design of online testable reversible circuits. A reversible circuit composed of NOT, CNOT and Toffoli gates can be made online testable by adding two sets of CNOT gates and a single parity line. Finally, we have proposed an approach to achieve fault tolerance in reversible circuits. A design of a 3-bit reversible majority voter circuit is presented. This voter circuit can be used to design fault tolerant reversible circuits

TCP performance over proactive and reactive routing protocols for mobile ad hoc networks

In this paper, we investigate the performance of TCP over a proactive and a reactive routing protocol for mobile ad hoc networks. For this investigation we choose DSDV for the proactive side and AODV for the reactive one. We use ns-2 to evaluate the TCP window size, throughput, packet delay and routing overhead over a single TCP connection. We also use a different metric, expected throughput, for the comparison of throughput of the routing protocols. Our observation shows that the chosen metrics are closely related and the TCP performance is heavily dependent on the routing protocol. It also shows that the TCP performs better over the reactive one when mobility is high