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Atomic multicast is a group communication primitive that allows disseminating messages to multiple distributed processes with strong ordering properties. As such, atomic multicast is a widely-employed tool to build large-scale systems, in particular when data is geo-distributed and/or replicated across multiple locations. However, all the most efficient atomic multicast algorithms suffer from a convoy...
Wireless Sensor Networks (WSNs) are an important tool for monitoring strategic and dangerous sites where high security is required. Failure detection for sensor nodes in this specified application is a major concern. The failure of any system may cause losses such as economical, equipment damage and even risks for human lives. Moreover, failures are unavoidable in WSNs due to hardware constraints,...
Many advances have been made in the design of full replication protocols in distributed systems. Causal consistency in such systems has received great interest. However, most existing works focus on the implementation in full replication because it simplifies designing the algorithm. More recently, interest in full replication has shifted to focus on the development of partial replication protocols...
Predicting the capacity of wireless mesh networks is difficult, due to the complex interaction of various layers such as the radio environment, media access protocols, network protocols and, traffic load and types. When modelling and simulation takes into account the interaction of all these factors, it can facilitate insights into anticipated network behaviour. These insights can be used to more...
A cooperative multi-path relay channel (MPRC) with multiple decode-and-forward relay terminals is considered in this paper. In order to enhance the system reliability, the source is encouraged to transmit at a higher power such that more relays can successfully decode the source symbol. This, however, may lead to unnecessary energy waste. For reliable symbol delivery while improving the system energy...
In this paper, a novel opportunistic protocol is proposed for the two-way relaying systems with direct link. Unlike the existing protocols, the proposed protocol opportunistically exploits analog network coding and the direct link. The proposed protocol switches its strategies to support two traffic flows simultaneously or support only one traffic flow based on instantaneous channel conditions. An...
The DDS (Data Distribution Service) is real-time communication middleware used for a large-scale network system. For performance evaluation of the DDS, we developed a DDS simulator on QualNet. The performance measures obtained from the DDS simulator include discovery-completion time, end-to-end message-transfer delay, the number of data messages and the user-data processing time. The DDS simulator...
Peer to Peer (P2P) systems recently are receiving a lot of attention from the researchers. In such systems, peers are heterogeneous in providing resources and services. Peers do not have the same reliability so it is necessary to evaluate their trustworthiness for a reliable sharing of the resources and services. In this paper, we propose a fuzzy-based system for peer reliability in JXTA-Overlay P2P...
NS-2 is the most famous simulator among other network simulators. Most of researchers use NS-2 to evaluate their new protocols/architectures. Although NS-2 has much resource and many available tools to generate different characteristics and network scenarios, source codes created on NS-2 is not able to be reused for real implementation. The releasing of NS-3 changes the way researchers work. NS-3...
It comes out to be the first problem needs to be resolved for wireless sensor networks, that is, to make data acquisition at a lower energy consumption but with high reliability on transmission. So, a reliable transmission protocol with dynamic adjustment for caching position is presented in this paper, which makes a good compromise between transmission reliability and energy consumption. This protocol...
The Mint-Route routing protocol was proposed to enhance reliability by choosing adjacent link with the smallest number of lost packets as next hop in wireless sensor networks. However, since packets are transmitted over unstable wireless link, physical distance between nodes can mostly affect the reliability. So, long path with many hops is usually established between source and destination while...
Flooding, that is to deliver a packet from one node to all other nodes in the network, is an integral part of many wireless protocols. Flooding is often implemented by a series of broadcasts of each node and this causes some problems such as the broadcast storm and low reliability, by being engaged with the effects of radio signal propagation, e.g., multipath fading and interference. Many researchers...
In wireless sensor networks (WSNs), flooding is usually adopted by broadcast services to disseminate control messages. However, flooding produces an excessive number of unnecessary control packets, markedly increasing overhead. This work proposes a new gossip-based scheme, in which nodes forward control messages with dynamic probability to decrease the number of redundant messages and thereby improve...
In this paper we present an improved gossiping data distribution technique with emphasis on the location of nodes called "LGossiping" that reliably disseminate information among sensors in a wireless sensor network. Nodes running LGossiping data distribution technique use global positioning system to relay data throughout the network. Each node decides upon position knowledge of the others...
In this paper we propose a set of different configurations of failure recovery schemes, developed for network-on-chip (NoC) based systems. These configurations exploit the fact that communication in NoCs tends to be partitioned and eventually localized. The failure recovery approach is based on checkpoint and rollback and is aimed towards fast recovery from system or application level failures. The...
The reliability of the GMPLS control plane is discussed in the paper. The protection of signaling link can improve significantly reliability level of the control plane and therefore overall GMPLS reliability. The signaling tunnel in the control plane can be implemented with the use of MPLS technology. This approach has been implemented in the simulation environment and verified. The results confirm...
This paper proposes a fast forward medium access control protocol (FFMAC) for quality-of-service (QoS) guarantee in multihop IEEE 802.11s wireless mesh networks with multiple channels. To the best of our knowledge, the proposed protocol is the first one which considers the multihop and multichannel issues simultaneously. It provides higher priority for real-time applications, while remaining the distributed...
In this paper, we propose a cross-layer optimization approach that exploits retransmission diversity in wireless CDMA communications. Conventionally, data packets that are not correctly detected are usually dropped. These dropped packets can be used to help data packet detection. By exploiting all the retransmitted packets, data packets can be correctly detected with higher probability. The proposed...
Due to resource constraints, digital image transmissions are a significant challenge for image sensor based wireless sensor networks (WSN). In this paper, we propose a novel robust and energy-efficient scheme, called image component transmission (ICT) in WSN by providing various levels of reliability during image transmissions. Essential components such as the information for the positions of significant...
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