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Prevailing network technologies separate control and data planes embedded within networking devices. Problems with this are expensive maintenance of closed-technology network devices and the inability to enforce coherent network-wide policies. Software Defined Networks (SDN) solves these problems with logical centralization based on open standards that use existing networking equipment. Quality of...
Recently, large amount of data is transferred over network. The available bandwidth of network varies momently, so it is important to realize the efficient data transfer by fully utilizing the time-varying network bandwidth. We are developing the method of efficient data communication by dynamically compressing data, assuming the use of the high performance of multi-core processors. Our method can...
Recently, logic-in-memory (LIM) is gaining growing interest because it eliminates the unnecessary data movement between the memory and logic components that embarrasses both performance and power dissipation in modern microprocessors. However, most of the existing LIM just puts the logic and memory closer rather than a true integration due to the incompatibility of logic and memory circuit structures...
We focus on designing efficient integrated schedulers for handling mixed unicast and multicast traffic. We consider an input-queued switch with a multicast-capable switch fabric. At each input port of the switch, there are N dedicated unicast VOQs and one shared multicast queue (MQ). An existing approach to the design of integrated scheduler (i.e., a sequential scheduler) is to run two component schedulers,...
Virtual machine (VM) consolidation and switch/path consolidation are two typical techniques for improving energy efficiency in data centers (DCs). Most of existing work separately optimize VM consolidation and switch consolidation which results in inferiority of the optimization performance. Moreover, these work usually handle a user application as a VM flow (i.e., a source VM is connected to a destination...
Reliable network time measurement tools are important to ensure that monitoring network systems work properly, but their development do not consider security as a concern and, for example, delay attacks could compromise those tools effectiveness. Indeed, nowadays the network time measurement is not always reliable. Some researches do propose to increase network time measurement reliability using Openflow...
In the Cloud Radio Access Network (C-RAN)architecture, a fronthaul network carries digitized radio signals from Remote Radio Head (RRH) to centralized Baseband Unit (BBU) using the Common Public Radio Interface (CPRI), which has a one-way jitter requirement of several nanoseconds. It is widely believed that Ethernet cannot meet this stringent jitter requirement, thus today's fronthaul networks are...
As more and more data-intensive applications have been moved to the cloud, the cloud network has become the new performance bottleneck for cloud applications. To boost application performance, the concept of coflow has been proposed to bring application-awareness into the cloud network. A coflow consists of many individual data flows, and a coflow is completed only when all its component flows are...
Envelope Tracking Power Amplifier (ET PA) is becoming prevalent because of its higher power efficiency (compared to its linear PAs) and higher linearity (compared to other high power-efficiency PAs such as Envelope Elimination and Restoration PAs and outphasing PAs). Of various building blocks in an ET PA, the supply modulator is the most critical block as the supply modulator has major effect on...
The Ultra Dense Network (UDN), as a key enabler for future wireless networks (such as 5G), is comprised of a massive number of small cells in the network. Nonetheless, energy consumption will be non-negligible when a large number of smallcell Base Stations (BSs) are densely deployed. One practical and effective approach to reduce the energy consumption of the UDN is through dynamically controlling...
This paper presents a 10-bit, 5.12 kS/s noise-shaping non-binary successive approximation ADC (SAR ADC). The proposed noise-shaping SAR ADC requires an additional capacitor and a buffer along with a non-binary SAR ADC to implement the first order noise-shaping of the quantization error. The structure operates with a rail-to-rail input and yields a very high dynamic range of about 89.3dB. This is a...
This paper presents a comparison of throughputand end-to-end latency of synchronous and asynchronous heterogeneousNoC under uniform and exponential traffic conditionsusing different parameters. The parameters we have chosen areno. of cores, load (traffic) and no. of VCs of a router. Further, sinkbandwidth analysis of synchronous and asynchronous NoC underuniform traffic was studied and compared. The...
The shared nature of cloud network infrastructures causes unpredictable network performance, which may degrade the performance of these applications. Recently, several works propose to explicitly reserve the network bandwidth in the cloud with virtual network abstraction models, which pre-specify the network bandwidth between virtual machines (VMs) for a tenant job. However, the pre-specification...
Many large-scale applications in science and business domains require the transfer of big data over high-performance networks for remote operations. Such big data transfer is increasingly supported by bandwidth reservation services that discover feasible and efficient routing options in dynamic network environments with time-varying resources. By exploring the flexility and capacity of variable paths,...
MeteoSwiss, the Swiss national weather forecast institute, has selected densely populated accelerator servers as their primary system to compute weather forecast simulation. Servers with multiple accelerator devices that are primarily connected by a PCI-Express (PCIe) network achieve a significantly higher energy efficiency. Memory transfers between accelerators in such a system are subjected to PCIe...
Power line noise is one of critical problems in bio-sensing. Various approaches utilizing both analog and digital techniques has been proposed. However, these approaches need active circuits with wide dynamic range. This paper proposes the use of N-path notch filter as a power line noise filter. However, the notch depth in a conventional N-path notch filter is limited by the number of path. A new...
Wireless sensor network (WSN) TestBed design challenges can be divided into three main sub-categories: architectural, hardware and software. By considering all these challenges, an optimal solution was found and EDI TestBed created. In this paper, a method, which solves software related problems in large scale WSN TestBed, such as how to distribute computational resources, control all of the TestBed...
In mixed-critical networks is very important to provide appropriate mechanisms which prevent lost of data during communication, especially if that are high-priority frames. As a basis for analysis, in this paper we observed principles of multy-priority based traffic integration in TTEthernet networks that can be configured as strictly deterministic, or mixed-critical. It is analyzed influence of the...
Software Defined Network (SDN) has been envisioned as the next generation network infrastructure, which simplify network management by decoupling the control plane and data plane. It is becoming the leading technology behind many traffic engineering solutions, since it allows a central controller to globally plan the paths of the flows. However, Ternary Content Addressable Memory (TCAM), as a critical...
This paper includes design and implementation result of an adaptive beam forming antenna for upcoming 5G and Internet of Things (IoT). Switched parasitic array antennas are low cost, small sized and compact circular array antennas that steer beam in a desired direction by variation in switching pattern of parasitic elements. The proposed antenna design has an active center element, which is surrounded...
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