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Underwater wireless sensor networks (UWSNs) are prone to message loss due to their poor link condition with high bit error rate (BER). Retransmission-based mechanisms such as ARQ can be used for the reliability, however, they are not suitable for UWSNs due to the inherent long propagation delay of UWSNs. Therefore, a forward error correction (FEC) mechanism might be an alternative in order to guarantee...
Communication networks are becoming more essential for our daily life and critically important for industry and governments. The intense growth in the backbone traffic implies an increment on the power demands of the network equipment. This power usage has a significant negative effect on the environment. In this paper, some ideas are exposed and discussed in order to make backbone communication network...
Survivability becomes an important issue in optical networks due to the huge bandwidth offered by optical technology. Many works have studied network survivability. The majority of these works are typically destined to single-domain. In this work we address the survivability in multidomain optical networks. This paper provides a classification of the existing protection solutions proposed for multi-domain...
Optical grids are widely deployed to solve complex problems we are facing today. An important aspect of the supporting network is resiliency i.e. the ability to overcome network failures. In contrast to classical network protection schemes, we will not necessarily provide a back-up path between the source and the original destination. Instead, we will try to relocate the job to another server location...
Communication network has been shown as a key factor to influence system performance even under the same coordination algorithm. Although many distributed algorithm designs have been proved to be feasible to make up some functions in the large scale networks as claimed, for example, recovering the network from link failure or node failure, the efficiency of recovery in different network topologies...
In IP-over-WDM networks the logical topology consists of a set of lightpaths that are routed on top of the physical fiber topology. Hence a single fiber cut can lead to multiple logical link failures. We study the impact of lightpath routing on network survivability and spare capacity requirements. We show that poor routings can lead to significant increase in spare capacity requirements and develop...
In studies of survivable networks, it is important to be able to differentiate network topologies by means of a robust numerical measure that indicates the levels of immunity of these topologies to failures of their nodes and links. Ideally, such a measure should be sensitive to the existence of nodes or links which are more important than others, for example, if their failures cause the network's...
In order to improve survivability of Multi-Domain Optical Network (MDON) and differentiate service reliability, this paper provides a protection mechanism with differentiated service reliability in MDON based on Conditional Risk Disjunction Degree (CRDD), called PDRC. Firstly, defines CRDD, provides Intra-domain virtual links Reflection arithmetic based on CRDD considering wavelength Continuity (IRCC)...
MPLS has become an increasingly common technology for guaranteed transport services for carrying customer traffic. We consider the survivable design problem from the perspective of an MPLS VPN network provider where the data rate required is dynamically configurable based on customers' traffic demands. Network optimization formulations for global design and end-to-end fast reroute design are presented...
Telecommunication networks spanning large areas are subject to various failures. A survivable network provisioning scheme addressing multiple levels of network failures, especially disaster failures which may take out many network components, is desirable in the future Internet. In this study, we propose and investigate the characteristics of a multistate multipath provisioning scheme for telecom...
Mobile free space optical (FSO) and directional RF communications links suffer from frequent link blockages due to opaque obstructions that can result in degraded or failed networks. In this paper, a methodology is presented for assuring connectivity in networks with fragile links. The frequency and duration of link blockages are characterized using modeling and emulation tools developed for realistic...
ZigBee is a network stack requiring only low power consumption, that is used in different application areas. The 2003 ZigBee implementation has flaws when the coordinator node fails, because it represents a single point of failure. This paper presents a new approach to overcome this pitfall. The solution is transparent for communicating end nodes, easy to use, and supports all ZigBee features. It...
In this paper, we address the problem of topology control in wireless sensor networks (WSNs). Taking energy consumption and reliability into account, we consider topology control to be a problem of multi-objective degree-constrained minimum spanning tree (mcd-MST) and present an improved discrete particle swarm optimization (PSO) algorithm for generating such topology schemes. The simulation results...
The high capacity of fibers used in optical networks, can be divided into many channels, using the WDM technology. Any damage to a fiber causes all the channels routed through this link to be broken, which may result in a serious amount of data loss. As a solution to this problem, the virtual layer can be mapped onto the physical topology, such that, a failure on any physical link does not disconnect...
A reliable storage system is a system that ensures the protection of data from loss. Such systems are needed in many critical fields. We cannot imagine that a financial institution looses data about one its clients. Moreover the exponential growing volumes of the data and its availability are crucial issues. A centralized storage system would be overloaded and be a single point of failure. That is...
A wireless sensor network is often deployed for environment monitoring and event inspection. Among these applications, the sink of the network usually requires the data generated on each sensor node periodically, and such a network is called a data-gathering sensor network. In each round of the data gathering process, a sensor node sends its reading via a single-hop or multi-hop path to the sink....
Network topology seriously affects network cost, path length, distribution of link load, and reliability, for example, so we need to consider these multiple criteria with different units simultaneously when designing network topology. The analytic hierarchy process (AHP) is a way to make a rational decision considering multiple criteria. Using AHP, we can reflect the relative importance of each criterion...
In this paper, we present a practical method to integrate different aeronautical communication systems comprising of satellite-based, air-based and ground-based systems into one single global aeronautical network. This integrated network is a solution to the problem of saturated ATM/ATC communications in the coming years. The model of the integrated network is explored as the base to study all concerned...
Wireless sensor networks (WSNs) is the next generation of sensor network and the research of network topology optimization has the important meaning for present and future. By making full use of the information about the node position and energy, the WSNs topology algorithm based on immune principle is proposed in this paper, and the simulation results show that this algorithm improves the performance...
In optical wavelength-division multiplexing (WDM) networks, recent technological progress is enabling dynamic optical transport in which leasable circuits (connections) can be set up and released for a specific duration of time, providing large capacity to bandwidth-hungry applications. Set-up times can be flexible or fixed, depending on the type of the application. Since the interruption of a high-speed...
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