A wireless Ad Hoc network is formed by a collection of nodes disposed in a dynamic way, without the need for a central node to coordinate them. This is one of the reasons why a great number of routing protocols for Ad Hoc networks are being developed. After the study of a set of them, this paper has subjected four different protocols to different scenario situations, in order to evaluate their ...

SACK TCP was designed to be capable of surviving multiple segment loss. This can occur during network congestion as well as network failure. We studied the resilience behavior of SACK TCP in both cases and found that there is a critical point at which the behavior of SACK TCP changes significantly. If the number of lost segments in one transmission window is greater than this critical number, S...

In this paper analysis and performance of AODV, DSR, GRP and OLSR is done for 1 mbps data rate. We used OPNET Simulation tool we created a network containing 30 mobile nodes with data rate 1 Mbps with transmission power 0.005 watts and buffer size 1024000 bits each node moves randomly in the network and simulation time was 1500 sec. Routing protocols are compared in terms of WLAN Load, WLAN Med...

This paper provides a comprehensive investigation of two wireless protocols performance over short range communications for monitoring vital signs in athletes, mainly during training. Live physiological monitoring of athletes during sports can help to optimize their performance at a specific time in order to maximize athlete efficiency and preventing undesirable events like injuries. ZigBee (ov...

With the improvement of wireless network, quality of service has become a major research area. Researchers have proposed many co-ordination functions for improvement of service quality. In our study, we have compared the different characteristics and properties of PCF, DCF and Enhanced DCF to evaluate the performance of wireless network .We used OPNET IT GURU Academic Edition simulator for perf...

Ambient networks are envisioned to be a combination of diverse but complementary access technologies. Internetworking these types of networks will provide mobile users with ubiquitous connectivity across a wide range of networking environments. The composition of existing and emerging heterogeneous wired/wireless networks requires the design of intelligent networks components to enable mobile u...

Due to the costly spectrum and ever growing demand for multimedia services, it thus become important to optimise and design appropriate scheduling algorithms and channel management techniques to maximise throughput and QoS. In this paper, the IEEE 802.16e standard based Mobile WiMAX (Worldwide Interoperability for Microwave Access) system is explored for the purpose of Quality of Service provis...

Wireless Sensor Network (WSN) has been regarded as a distinguished Ad Hoc Network that can be used to fulfil multiple tasks and applications. Since a WSN consists hundreds of small size, low cost and battery powered sensor nodes. These nodes have the event sensing capabilities, data processing capabilities. Number of routing protocols has been implemented to perform routing in these networks. I...