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In recent years a large number of LEO (Low Earth Orbit) satellites have been launched into space for various applications, such as weather forecast, environment monitoring and military surveillance. One important task of these satellites is to collect data and download them to Earth Stations (ESs) for further processing. Since LEO satellites fly at high speeds and have very limited contact time with...
Storm has been a popular distributed real-time computation system for stream data processing, which currently provides an even scheduler to distribute all executors and workers of topology among all worker nodes. In this paper, we find that the even scheduler ignores the allocation and dependence relationship among slots. This would bring the load-unbalancing problem when the topology run failed and...
Linear network coding (LNC) is a promising technology that can increase network throughput, improve transmission robustness and provide data confidentiality. In this paper, we investigate the optimal transmission topology construction and LNC design for secure multicast, i.e., the Integer Secure Multicast (ISM) problem. The ISM problem aims to find the transmission topology with integral link rates...
Slow Start algorithm helps the TCP flows to quickly ramp up their congestion window (cwnd) by employing an exponential increase pattern. This pattern of increasing cwnd leads to consecutive loss of packets in bulk, and hence, results in large number of packets being re-transmitted. Recently, the limitations of this approach have become apparent as many Internet applications are becoming more sensitive...
There has been a great deal of research into the considerable challenge of managing of traffic at road junctions; its application to vehicular ad hoc network (VANET) has proved to be of great interest in the developed world. Dynamic topology is one of the vital challenges facing VANET; as a result, routing of packets to their destination successfully and efficiently is a non-simplistic undertaking...
High throughput is of particular interest in data center and HPC networks. Although myriad network topologies have been proposed, a broad head-to-head comparison across topologies and across traffic patterns is absent, and the right way to compare worst-case throughput performance is a subtle problem. In this paper, we develop a framework to benchmark the throughput of network topologies, using a...
End-to-end network latency has become an important issue for parallel application on large-scale high performance computing (HPC) systems. It has been reported that randomly-connected inter-switch networks can lower the end-to-end network latency. The trade-off is a large amount of routing information. For irregular networks, minimal routing is achieved by using routing tables for all destinations...
Wireless multi-hop networks are scalable in that devices can easily connect to the network. Such scalability is also required in IoT. However, wireless multi-hop network mostly suffers from high probability of transmission failure due to interference, and nodes connected to the network often experience connection loss and subsequent segment loss which node mobility and routing update incur. Due to...
The emergence of Software Defined Network(SDN) gives the demand of big data and network management a chance. SDN separates the control and forwarding in traditional network through OpenFlow protocol. In the software-defined network, SDN controller is an important integral part that is the core of SDN. In this paper, firstly we summarize the common SDN controller, and choose two popular, wider using...
In visible light communication (VLC) network, which can provide high data rate information transmission, the multiple users will get access to network according to the carrier sense multiple access with collision avoidance (CSMA/CA) mechanism specified by IEEE 802.15.7 standard. In this paper, we propose to improve the channel access mechanism by increasing the channel utilization efficiency and achieving...
Energy Efficiency is an important feature in poor-covered areas where not only the access to a cellular network is scarce but also energy sources are limited. In this paper, we consider a wireless mesh network to act as a local backhaul network to cover rural and remote villages. The shortage of energy in these settlements motivates to optimize the energy consumption of the wireless backhaul network...
Inter-cell Interference can be seen as a huge challenge towards meeting the high capacity and coverage targets, as envisioned in 5G era. To this end, factors like the expected high density of access nodes reusing the same spectrum, the diverse sources of interference from heterogeneous access technologies, flexible wireless backhauling and the consideration of multiple 5G services with different KPIs...
Nowadays, Software-Defined Networking (SDN) is a powerful architectural model, decoupling control and forwarding planes through the abstraction of network elements and functionalities. As known, in SDN networks the controller is the key element since the intelligence of the network is centralized. Hence, the deployment of network services, such as QoS, traffic engineering and traffic recovery, requires...
Hadoop MapReduce has nowadays become the de-facto standard for the Big-Data processing within Cloud datacenters. However, little is known about the influence of datacenter network topology on Hadoop performance, and suitability of various topologies for different workload distributions. By extending a publicly available simulator CloudSim, we simulate six well-known or recently proposed topologies...
Apache Storm has recently emerged as an attractive fault-tolerant open-source distributed data processing platform that has been chosen by many industry leaders to develop real-time applications for processing a huge amount of data in a scalable manner. A key aspect to achieve the best performance in this system lies on the design of an efficient scheduler for component execution, called topology,...
In Wireless Mesh Networks (WMNs), many applications are based on broadcast, such as the public security information, weather forecast and live show for users. Besides, broadcast is also a fundamental component of network protocols. Many broadcast approaches has been proposed like flooding and node-based CDS(N-CDS) scheme, but few have promising performance when used in multi-channel scenarios. In...
Due to the increased demand for internet services, the challenges that large data centers must handle are bigger. Therefore, in recent years the development of networks defined by software (SDN) has caught the attention of the scientific community, mainly because of the flexibility it presents in its model of centralized management, which facilitates the development of solutions according to demand...
This paper quantifies the difference in resource demand between modern and classic NoC workloads. In the paper, we show that modern workloads are able to better utilize higher numbers of VCs and smaller C factors in order to attain performance and energy efficiency. This is because of the high throughput and possible local congestions in their traffic pattern. As a result, such workloads are more...
To achieve high throughput, core count in compute accelerators such as General-Purpose Graphics Processing Units (GPGPUs) increases continuously. The communication demand of these cores boosts the demand for a low-latency packet switched network. As packet latency is mainly composed of per-hop latency, contention latency and serialization latency, a favorable Network-on-Chip (NoC) design should efficiently...
The increasing use of wireless technologies for the implementation of mesh networks has led to the emergence of various types of applications. The reduction in cost, ease in deployment and flexibility are the main factors that make wireless mesh network increasingly popular. The ease of setup, mobility and extended reach are the added advantages of this topology. This paper gives a detailed explanation...
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