The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
IEEE 802.15.4 standard is designed for low power wireless personal area networks (LR-WPANs). Recently, both industry and academia are attracted to IEEE 802.15.4 because of its applicability in wireless sensor networks (WSNs) and wireless body area sensor networks (WBANs). An important feature of IEEE 802.15.4 is the very low duty cycle operation to conserve sensor node's energy. In this paper, we...
This paper introduces and analyzes a novel mobile access coordinated wireless sensor network (MC-WSN) architecture. In conventional sensor networks with mobile access points (SENMA), the mobile access (MA) points traverse the network to collect information directly from individual sensors. While simplifying the routing process, a major limitation with SENMA is that data transmission is limited by...
Wireless Mesh Networks (WMNs) are attracting a lot of attention from wireless network researchers, because of their potential use in several fields such as collaborative computing and communications. Considering mobility of the terminals, routing is a key process for operation of WMNs. In this paper, we present the implementation of a testbed for WMNs. We analyze the performance of Optimized Link...
Cloud computing has been widely used to provide services such as search, social networks, and distributed storage systems. Data centers are built to support the requests of cloud applications which generally adopt multi-layer partition/aggregation workflow pattern. In this multi-hop environment with dual-homed topology, the aggregator needs to wait for all responses from the works to generate final...
In this paper, we design and implement a scheme to build an optimal spanning tree over a hybrid network composed of SDN and legacy switches. SDN is an emerging network technology and gradually gaining adoption worldwide. However, during the technology transition period, which may last several years from now on, inevitably SDN switches and legacy switches will need to coexist in a network. In a legacy...
Path length of a multi hop Ad Hoc networks has an adverse impact on the end-to-end throughput especially during network saturation. The success rate of forwarding packets towards destination is limited due to interference, contention, limited buffer space, and bandwidth. Real time applications streaming data fill the buffer space at a faster rate at the source and its nearby forwarding nodes since...
The performance of wireless scheduling algorithms directly depends on the availability and accuracy of channel state information (CSI) at the scheduler. As CSI updates must propagate across the network, they are delayed as they arrive at the controller. In this paper, we analyze the effect that delayed CSI has on the throughput performance of scheduling in wireless networks. By accounting for the...
Since traffic load in mobile networks typically changes significantly over time, time-varying routing, where routing changes in certain time intervals, seems an obvious solution. Yet multiple researchers have claimed independently in the past, that time-varying routing does not lead to worthwhile benefits given its overhead. In this paper, we study this issue in a systematic way. We argue that previous...
Today's cloud datacenters host wide variety of applications which generate diverse mix of internal datacenter traffic. In a cloud datacenter environment 90% of the traffic flows, though they constitute only 10% of the data carried around, are short flows with sizes up to a maximum of 1MB. The rest 10% constitute long flows with sizes in the range of 1MB to 1GB. Throughput matters for long flows whereas...
Network services, such as security, load-balancing, and monitoring, are an indisputable part of modern networking infrastructure and are traditionally realized as specialized appliances or middleboxes. Middleboxes complicate the management, the deployment, and the operations of the entire network. Moreover, they induce network performance issues and scalability limitations by requiring huge amounts...
Network-on-Chip (NoC) is an emerging solution for interconnect problems for both ASICs and FPGAs nowadays. In this paper, we deliver a comparative review between ASIC-based and FPGA-based NoCs. An exploration of design tradeoffs for different NoC design parameters is also given. We also propose an evaluation methodology and design recommendations for various design parameters for both ASIC and FPGA...
This paper describes a new reliable transport protocol designed to run on top of a multicast network service for delivery of continuously generated files. The motivation for this work is to support scientific computing Grid applications that require file transfers between geographically distributed data enters. For example, atmospheric research scientists at various universities subscribe to real-time...
Increasing numbers of service providers have tended to use tens of geographically dispersed datacenters in recent years. Thus, a major unmet challenge is efficiently transferring data among multiple datacenters in different domains. Traditional single-path transfer mechanism based on BGP has limited reliability and low link utilization; therefore, multi-path inter-domain flow transfer mechanisms have...
Software Defined Networking is one of the most promising approaches to the deployment of future network infrastructures. The most of the Internet service providers have to deal with a number of configurations to a crescent amount of network devices. SDN is a paradigm that proposes the separation of data forwarding plane from the data control plane. OpenFlow is an standard protocol used in SDN for...
Improving availability and throughput is a significant challenge for data center networks. Recent studies have attempted to use a variety of routing and multipathing techniques. However, no method has yet managed to combine availability and throughput improvement with actual deployability, usually because of dedicated hardware requirements. In this study, we focus on commodity-based layer-3 data center...
We tightly integrate caching and congestion control into a unified approach to enhance user-centric performance in information-centric networking. To do that, we take advantage of the available congestion price fed back by congestion control to guide caching decision at each content router. The point is to let caching work in a longer time scale to alleviate congestion retrieving expensive content...
Software-defined networking (SDN) renovates traditional networking systems by replacing a distributed, per-switch control plane with a (logically) centralized one. To design a scalable, highly available SDN control plane, it is inevitable to disseminate the network state to multiple instances horizontally by using measures like replication and partitioning. However, some recent studies reported that...
This manuscript investigates the issue of implementing chains of network functions in a “softwarized” environment where edge network middle-boxes are replaced by software appliances running in virtual machines within a data center. The primary goal is to show that this approach allows space and time diversity in service chaining, with a higher degree of dynamism and flexibility with respect to conventional...
Scale-out workloads are applications that are typically executed in a cloud environment and exhibit high level of request level parallelism. Such workloads benefit from processor organizations with very high core count since multiple requests can be serviced simultaneously by threads running on these cores. The characteristics of these workloads indicate that they have high instruction footprints...
Low latency, high throughput, and fairness are the stringent performance requirements of data center networks. For web applications continue to thrive, data center must remain effective by addressing these challenges. While most of the challenges have been handled by data center specific transport protocols (e.g. DCTCP), these transport protocols are not default options for data center users. Free...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.