Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Software Defined Networking (SDN) is emerging as a new paradigm in which the control plane is decoupled from the data plane. SDN is an enabler of network control to become directly programmable. The underlying infrastructure can be abstracted from applications and network services. Recently, SDN has rapidly expanded and attracted many research efforts. In the open literature, analytical tools have...
Solid State Drives (SSDs) using flash memory storage technology present a promising storage solution for data-intensive applications due to their low latency, high bandwidth, and low power consumption compared to traditional hard disk drives. SSDs achieve these desirable characteristics using internal parallelism - parallel access to multiple internal flash memory chips - and a Flash Translation Layer...
Central to the vision of Smart City is the realization of efficient models that are capable of handling massive amounts of mobile multimedia data in the city's eco-system. Despite the improvement in hardware of mobile devices, challenges associated with analyzing, managing, and sharing of data still exist. As such, the responsiveness to real time applications and bandwidth and wireless constraints...
This paper evaluates the performance of partition scheme with first-last fit spectrum allocation for elastic optical networks. The scheme intends to increase the number of contiguous aligned available slots, and hence suppresses the blocking probability. The partition approach creates more aligned available slots by separating the spectrum allocation of the non-disjoint connections. The first-last...
Having an effective technique for bandwidth allocation is very important in wireless communications. Artificial Immune Systems, a relatively new meta-heuristic for solving optimization-related problems, is investigated in this study to design a cellular channel allocation framework. In this study, mobile hosts are allowed to continue interacting with the cells that they are currently in, even when...
Direct short-range device-to-device (D2D) communication enjoys many advantages, such as high transmission rates, low propagation delays, low transmit power and interference. In order to realize the advantages, a device or user equipment participating in the D2D communications have to determine that the devices discovered are in a proximity area and are suitable to establish links with them. Hence,...
The QoS (Quality of Service) requirements of real time (RT) applications are within the most important challenges that LTE (Long Term Evolution) must provide. However, due to the limited radio resources, it is important to take advantage of these resources efficiently. User traffic can be classified into two main classes which are RT (Real Time) and NRT traffic. To respond to RTs QoS requirements,...
The explosion of network bandwidth poses greatchallenges to data-plane flow processing. Due to the variable andpoor worst-case performance, naive hash table is incapable ofwire-speed processing. State-of-the-art schemes rely on multiplehash functions for enhanced load balancing to improve the worst-case performance. These schemes exploit the memory hierarchyand allocate compact on-chip data structures...
The utilization of Ethernet in the cellular terrestrial cloud radio access network (C-RAN) fronthaul is considered as a way for improving C-RAN network reconfigurability and efficiency in terms of both capital and operational expenditures. Moreover CPRI line bit rate dynamic reconfiguration may spare further capital expenditures by avoiding a peak traffic capacity allocation. A possible solution for...
A hybrid scheme of femtocell and distributed antenna system (DAS) is proposed that utilizes a subband dedicatedly assigned to each of multiple femtocells for system capacity gain and a subband shared for DAS simulcasting for cell-edge interference reduction. This paper presents a fundamental downlink performance evaluation and analysis of the in-building wireless system. Proportional fair (PF) scheduling...
TV White Spaces (TVWS) and associated spectrum sharing mechanisms represent key means of realizing necessary prime-frequency spectrum for future wireless communication systems. We have been leading a major trial of TVWS technology within the Ofcom TV White Spaces Pilot. As one aspect of the work of our trial, we have investigated solutions for aggregation in TVWS and as part of that the performance...
In this paper, a flexible Yagi-Uda antenna with polyimide substrate for wireless body area network (WBAN) is proposed. The prototype covers 2.45GHz Industrial, Scientific and Medical (ISM) band. The effects of bending along x-axis and y-axis for flexible Yagi-Uda antenna is analyzed. The resonant frequency, bandwidth and radiation patterns are simulated with various bending conditions. Results indicate...
Direct (or device-to-device, D2D) communications are being investigated in the framework of LTE- Advanced. They allow one-to-one communications between two endpoints, under the control of the eNodeB, which allocates resources for the d2d flow, but does not act as a relay for its traffic. The direct link can also be used for file transfer or proximity-based browsing, i.e. applications running on TCP...
To effectively schedule transmissions in NG-EPON, Hybrid-PON is further classified into MSD-PON, SSD-PON, and WA-PON depending on their different access architectures, viz. how a group of ONUs share the assigned wavelength channels. The architectures for these three Hybrid-PONs were introduced by the IEEE 802.3 Ethernet Working Group in 2015. In this study, we first propose to apply some existing...
The recent advent of stacked memory devices has led to a resurgence of researchassociated with the fundamental memory hierarchy and associated memory pipeline. The bandwidth advantages provided by stacked logic and DRAM devices haveinspired research associated with eliminating the bandwidth bottlenecksassociated with many applications in high performance computing. Further, recent efforts have focused...
GPU accelerators have successfully established themselves in modern HPC clusters due to their high performance and energy efficiency. To increase the GPU computational power in a cluster node and tackle larger problems, multi-GPU nodes have become the platform of choice for scientific applications. In a multi-GPU node, GPU devices are interconnected together via different communication channels. Thus,...
Graphs are used in a wide variety of applicationdomains, from social science to machine learning. Graphalgorithms present large numbers of irregular accesses with littledata reuse to amortize the high cost of memory accesses, requiring high memory bandwidth. Processing in memory (PIM) implemented through 3D die-stacking can deliver this highmemory bandwidth. In a system with multiple memory moduleswith...
Multiplexer/switch ICs are key components of NVDIMM architecture that serve to isolate the host controller from the DRAM memory system. Signal integrity performance of the IC can drastically be impacted by package parasitics. In this paper we detailed a system co-design methodology that was employed to design a cost-effective DDR4 switch packaged in a laminate-based chip-scale packaging (CSP), without...
To reduce the energy consumption of a large number of network devices in a data center, energy-efficient schemes use various heuristics to consolidate traffic to fewer switches. Most of these works, however, ignore the flow-level performance, which is one of the most critical requirements in production data centers. Hence, flow rate allocation should be considered together with flow path selection...
The performance of Device-to-Device (D2D) commu- nications in a cellular network depends on the resource sharing scheme between D2D links and cellular users. Existing research on resource sharing mainly focuses on power allocation under the condition that each D2D pair shares one cellular user's entire resources upon approval. Unlike conventional resource sharing schemes, this paper focuses on the...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.