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A network emulator is a software in its environment mimicking the functions and habits of the original network. Problems often encountered in doing research on computer networks is a problem of design and trial scenarios that require software and hardware enough to implement such a network scenario similar to a real scenario. Using virtual machine technology is expected to solve the problem. Netkit...
Resiliency, the capability to detect and react after a node failure in the network, is a key element for any network protocol. First, the detection of the failure must be quick to prevent dropping the packets and degrading the throughput too badly. Then, the repair, the computation of another path, has to allow the traffic to reach the destination without too much delay and without increasing the...
This paper focuses on the design of self-organizing algorithms for mesh topology formation between low-power short-range heterogeneous devices. To this end, we consider randomly deployed devices that are heterogeneous in terms of characteristics such as energy source (e.g. mains, rechargeable battery, and coin-cell), computational resources, and communication capabilities. Resilient topology formation...
The built-in caching capability of future Named Data Networking (NDN) promises to enable effective content distribution at a global scale without requiring special infrastructure. The aim of this work is to design efficient caching schemes in NDN to achieve better performance at both the network layer and application layer. With the specific objective of minimizing the inter-ISP (Internet Service...
Cognitive radio sensor network (CRSN) is a combination of wireless sensor network (WSN) and opportunistic spectrum access technology. It involves the issues related to energy and dynamic spectrum inherited by WSN and cognitive radio network (CRN) respectively. CRSN poses research challenges in designing an efficient topology control for communication in network. In this paper, we propose an event-driven...
As the current decade is witnessing a shift from traditional System — On — Chip (SoC) to Network — On — Chip, but the inherent problems such as congestion, latency and delay still remains the major issues of concern. The effect of these issues in a chip may somehow be minimized by carefully designing a topology and a suitable routing algorithm which offers both path diversity and scalability. In this...
Typically, wireless sensor networks (WSNs) provide application-specific networking schemes based on restricted resources. For the reasons, WSN-based routing algorithms can be variously designed for applications. Even if two different WSN applications (e.g., target tracking and temperature monitoring) coexist in a network, the two applications can use different routing algorithms, running simultaneously...
Recent works demonstrate constant optimizations in the number of transistors necessary to implement some logic functions by using non-series-parallel arrangements. However, these kind of networks can produce non-dual and non-planar structures, which cannot be fully treated by some of the classical algorithms dedicated to placement. In this paper we present two methodologies to place and route non-series-parallel...
There has been a rapid rise in the IP traffic throughout the Internet which takes advantage of the already established widespread IP infrastructure. Different suggestions are being explored to facilitate the next-generation access networks via IP mechanisms, with a growing trend towards a flat-IP structure and novel topological set-ups in the backhaul. Aligned with this evolution, there are increasingly...
Point to multipoint multicast (MC) packets delivery without optimal distribution trees is prone to unnecessary retransmissions that adversely influences narrow-band VHF networks. The bandwidth efficient MC packet delivery path has to be calculated to best reach all destinations using the inherent broadcast nature of VHF radio subnets by avoiding retransmissions of the same message/packet in the same...
Approaches to Information-Centric Networking (ICN) employ caches within a network to reduce transfers of information from a source to consumers. Copies of content within a network may be exploited through the use of a forwarding mechanism. Scope-flooding is a forwarding strategy based on the distribution of requests through flooding. The scope of the flooding is defined through a scope-value which...
Community networks are a new, emerging form of organising local network access and access to the public Internet where people themselves operate and build their networks. However, little research has been performed on the stability of the resulting bottom-up infrastructure. In this work, the BGP behaviour of community networks is empirically studied by evaluating dumps of BGP messages from the AWMN...
In the common implementation of software defined networking where only one controller is used, tasks required by various applications may overwhelm the controller as the network grows, leading to degradation of the network performance. Some multi-controller architectures have been proposed to remedy such scalability issue. In this paper, we present our design and implementation of a routing application...
WirelessHART, an international standard of wireless industrial networks, adopted the concept of graph routing to meet the requirements of short latency and high reliability. However, WirelessHART networks also require longer network lifetimes when implemented for industrial applications. Designing a reasonable form of graph routing is one method to achieve a balanced consumption of network energy...
We address the problem of RPL tree formation in self-organized, multi-hop, wireless sensor networks, where resource-constrained nodes may independently select their routing paths that maximize their performance. We study the result of the tree formation applying a non-cooperative gametheoretic model, and show that multiple objectives may lead to unstable Nash graphs with unwanted traffic cycling....
Real-time data delivery is a critical issue in WirelessHART networks. This paper develops a novel mathematical programming framework for joint routing and link scheduling of deadline-constrained traffic in WirelessHART networks. The general framework explores dynamic network flows in a time-expanded graph model and can provide flexible solutions for a variety of real-time data delivery problems. Data...
In order to construct and maintain stability Connected Dominating Set over MANET in Ubiquitous Stub Network, this paper proposes a novel area-based CDS construction and maintenance algorithm. The algorithm is divided into three phases: 1) Area Partition; 2) Area Expansion; 3) Area Connection. In additional, maintenance strategy is proposed in each phase respectively to handle node mobility with timer...
Moving the focus from nodes to information objects raises scalability issues, therefore name-based routing and name resolution should be designed to scale accordingly. There are two types of naming scheme: hierarchical and flat namespace. To guarantee clean separation of identifier (name) from locator and scalability in routing, we chose flat name and designed domain-based routing. A significant requisite...
Content Centric Networking (CCN) is one of the representative Information Centric Networking (ICN) architectures. In CCN, data objects are accessed instead of end hosts, and each router maintains a large size of routing table consisting of all name prefixes announced by content servers. To improve the scalability of CCN, an alternative name space relating to Router IDentifier (RID) has been proposed...
A wireless mesh employing directional antenna, termed DMesh in this paper, can greatly extend coverage and improve spatial reuse of wireless channels. As beaming direction of the antennas changes network topology which in turns affects routing and channel decisions, we address in this work how to jointly optimize topology (in terms of beaming directions of antennas), routing and channel assignment...
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