Scalable and automated monitoring processes for testing, debugging, and operation of VNFs and service-chains are crucial components towards achieving the aims of network softwarization – i.e., cheaper, faster, and shorter service deployment and network management processes. In this paper we present a decentralized monitoring approach aimed at supporting automated deployment and operation of VNFs and service-chains. The approach is…
Omnet++ Simulator
Software defined virtual wireless network: framework and challenges
Due to inflexibility, design and control of existing networks are very complex. Therefore, SDN aims to separate control and data planes clearly, which is an innovative and effective approach to this problem. With SDN, a service provider can adjust the settings of a network according to various requirements dynamically and in a timely fashion. This feature is especially suitable…
A novel design for content delivery over software defined mobile social networks
With the rapid development of mobile communication technologies, various kinds of content can be delivered among mobile users for content sharing. Due to the complexity of networks and particular features of mobile behaviors, to manage networks efficiently, SDMSNs are advocated where the control plane and data plane can work separately but cooperatively. In this article we outline how to…
A Survey of Security in Software Defined Networks
The proposition of increased innovation in network applications and reduced cost for network operators has won over the networking world to the vision of Software-Defined Networking (SDN). With the excitement of holistic visibility across the network and the ability to program network devices, developers have rushed to present a range of new SDN-compliant hardware, software and services. However, amidst this frenzy of activity, one key element has only recently entered…
Online virtual links resource allocation in Software-Defined Networks
Network virtualization is seen as a key networking paradigm for building diverse network services and architectures over a shared network infrastructure. Assigning network resources to virtual links and, more generally to virtual network topologies, efficiently and on-demand is one of the most challenging components of any network virtualization solution. This paper addresses the problem of on-line resource allocation of multiple virtual links on a Software Defined Network (SDN) infrastructure. The application context…
Power Boosting and Compensation During OTA Testing of a Real 4G LTE Base Station in Reverberation Chamber
A fully operational 4G long-term evolution (LTE) base station is tested in a reverberation chamber to analyze its performance in the presence of a multipath environment, typical of wireless and vehicular communications. Transmission quality parameters are measured ranging from the empty chamber situation (very rich multipath channel) to a very high loading condition to mitigate…
Results and analysis based on a novel LTE-R channel measurement at 2.6 GHz
In this paper, the measurements of 2 × 2 MIMO channel were performed at 2.6 GHz with 20 MHz bandwidth along the Harbin-Dalian passenger dedicated railway line. To improve the accuracy of multipath searching, we propose a multipath components (MCPs) extraction method based on this measurement, using the statistical properties of the data to reduce…
Infrastructure to Vehicle Throughput Performance in LTE-A Using 2D and 3D 3GPP/ITU Channel Models
This paper considers infrastructure to vehicle communications using Advanced-LTE. The paper compares the downlink throughput performance experienced by mobile users in an urban-macro-cell in cases of 2D and 3D channel models, where the impact of the 3D component on MIMO performance is investigated. Recently there has been strong interest in extending the MIMO processing from…
Diversity Performance of Off-Body MB-OFDM UWB-MIMO
This paper introduces a novel formalism to improve the performance of an off-body system by deploying multiple ultra wideband (UWB) antennas, positioned strategically on the body. A methodology is presented for determining the optimal positions of UWB antennas on the body, necessary to provide a reliable multiband orthogonal frequency division multiplexing (MB-OFDM) UWB diversity antenna system operating in…
Performance of a radiation pattern steering on-body gateway antenna for on-body and off-body propagation
Antennas in Body Area Networks (BAN) should be designed according to the link they are expected to form. In most of the systems, an on-body gateway collects data frames from other on-body sensors and relays them to an off-body gateway, realizing two different modes of operation, on-body and off-body. For such a device, the on-body link and the off-body link have different radiation pattern requirements.…