In Wireless Local Area Network, wireless node will suffer due to the hidden terminal node. This hidden terminal node leads to high collision, high drop rate of packets and high delay. To avoid this hidden terminal node, wireless nodes use the control messages to know the status of the destination nodes. Another issue in the WLAN is less coverage range with lesser number of nodes. To increase th...

The retransmission threshold in wireless sensor networks is critical to the latency of data delivery in the networks. However, existing works on data transmission in sensor networks did not consider the optimization of the retransmission threshold, and they simply set the same retransmission threshold for all sensor nodes in advance. The method did not take link quality and delay requirement in...

Background: The World Health Organization reports that 60% of deaths from conditions requiring health care are due to poor quality in low- and medium-income countries. aim this study is assess antiretroviral therapy (ART) services Osun State, Nigeria.Methods: This utilized descriptive cross sectional design. A semi-structured interviewer-administered questionnaire was developed collect data 150...

Satellites play an important role in the future network due to their wide area coverage and for providing connectivity in remote regions of the world. This paper presents the end-to-end quality of service (QoS) measurements taken employing a European Space Agency (ESA) testbed over DVB-RCS infrastructure, in collaboration with University of Surrey, UK. The applications chosen for these experime...

In this paper, targeting eye injuries caused by volcano disaster, we propose a medical image delivery service that streamlines the delivery of victim image data from a disaster area to specialist doctors in city hospitals using the Delay Tolerant Network (DTN). The service is used for an emergency response to provide quick feedback to healthcare workers after images are received by a hospital. ...

Vehicular Ad-hoc Network (VANET) represents a challenging class of mobile ad-hoc networks that enables vehicles to intelligently communicate with each other and with roadside infrastructure. VANET poses number of challenges in terms of Quality of Service (QoS) and its performance. Quality of Service depends on numerous parameters such as bandwidth, packet delivery ratio, data latency, delay var...

Delay Tolerant Network (DTN) is a promising technology which aims to provide efficient communication between devices in a network with no guaranteed continuous connectivity. Most of the existing routing schemes for DTNs achieve message delivery through message replication and forwarding. However, due to the lack of contemporaneous end-to-end communication path, designing routing protocols that ...

The lack of a delay constraint in the transmission control protocol/Internet protocol (TCP/IP) scheme is a barrier for time-based media transmission over the Internet. Recently, this barrier has been overcome with the introduction of protocols such as real time protocol (RTP) and real time streaming protocol (RTSP). However, these new protocols do not address the issue of smooth time-based medi...

A Mobile Ad-hoc is a mobile, multi-hop wireless network having no pre-existing infrastructure. Routing in Mobile Ad-hoc Networks is a challenging task due to dynamic topology, limited power and restricted bandwidth. The widely used shortest path based routing algorithms lead to various network utilization problems. Therefore, we need load balancing for distributing the traffic evenly in the net...

Delay Tolerant Networks (DTN) are mobile ad-hoc networks in which connections are often disruptive or discontinuous. Data forwarding using an appropriate routing strategy is a highly confronting issue in such networks. The traditional ad-hoc routing protocols which require end-to-end connectivity fail to function here due to frequent occurrences of network partitions. Spray and Wait (SaW) routi...