Confidential Domains of Execution

  • Cherubini D.
  • Cucinotta T.
  • Jul E.

Data Confidentiality or Cloud Computing? A true dilemma worthy of Hamlet and a reality for users aiming to exploit computational services in the cloud. Sensitive data can be protected by encryption, but if any computation is to be performed in the cloud, then the decryption key must be available somewhere ...

Performance of Asymmetric QPSK Modulation for Multi-Level ACK/NACK in LTE Uplink

  • Bonomo M.
  • Braun V.
  • Doetsch U.
  • Vangelista L.
  • Zimaliev A.

Asymmetric modulation schemes are candidates for conveying quality feedback in the form of multi-level ACK/NACK in a system employing reliability-based HARQ. Asymmetric QPSK (A-QPSK) modulation, for example, enables to convey one ACK level and three NACK levels with unequal error protection of the ACK and NACK levels, each NACK level ...

Demonstration of an SOA-assisted Open Metro-Access Infrastructure for Heterogeneous Services

  • Becker Jens
  • Bonk R.
  • Freude W.
  • Fritzsche D.
  • Haslach C.
  • Karnick D.
  • Kuebart W.
  • Meyer J.
  • Pfeiffer T.
  • Poehlmann W.
  • Schmuck H.
  • Weis E.

Abstract An open converged metro-access network approach allows for sharing optical layer resources like fibers and optical spectrum among different services and operators. We demonstrated experimentally the feasibility of such a concept by the simultaneous operation of multiple services showing different modulation formats and multiplexing techniques. Flexible access nodes are ...

Link Level Performance Assessment of Reliability-Based HARQ Schemes in LTE

  • Braun V.
  • Dekorsy A.
  • Doetsch U.
  • Woltering M.
  • Wuebben D.

This paper discusses two approaches of adapting the size of Hybrid-ARQ (HARQ) retransmissions in a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) uplink system. One goal of communication systems is to achieve a reliable transmission with a minimum utilization of the channel. In case of a decoding error ...

Field trial demonstration of open shared metro-access infrastructure

  • Bonk R.
  • Pfeiffer T.
  • Poehlmann W.
  • Schmuck H.

An open access network approach allows for sharing optical layer resources like fibers and optical spectrum among different services and operators at the same time. In a field trial the feasibility of such a concept has been demonstrated. Flexible access nodes are implemented including amplification and dispersion management to generate ...

D3.1: 5G Waveform Candidate Selection

  • Chen Y.
  • Dimitri Kténas
  • Gerhard Wunder
  • Ivan Simões Gaspar
  • Jean-Baptiste Doré
  • Marcin Dryjañski
  • Martin Kasparick
  • Nicola Michailow
  • Nicolas Cassiau
  • Schaich F.
  • Slawomir Pietrzyk
  • Vincent Berg
  • Wild T.

A driver for new waveforms is to better enable multiple access in the light of the requirements of future 5G wireless communication systems. The scenarios, which initiate those requirements, considered by the 5GNOW project, are driven by machine-type communication and the tactile internet, by coordinated multi-point (CoMP) and by fragmented ...

5GNOW: Alcatel-Lucent Bell Labs Germany Concepts and Results Contribution for Future Network and Mobile Summit 2013

  • Chen Y.
  • Schaich F.
  • Ten Brink S.
  • Wild T.

The 5GNOW approach is able to efficiently support different traffic types, which all have to be part of future wireless cellular systems. Our vision of a unified frame structure concept aims at handling the large set of requirements within a single 5G system. A filtered multicarrier approach will enable the ...

Block-Filtered Multi-carrier Technique for Wireless Systems Beyond LTE

  • Frigon J.
  • Schaich F.
  • Ten Brink S.
  • Vakilian V.
  • Wild T.

In this paper, we propose a novel multi-carrier transmission scheme as an alternative approach to orthogonal frequency division multiplexing (OFDM) in order to mitigate intercarrier interference (ICI). In the proposed scheme called block-filtered multi-carrier (BFMC), a filtering operation applied to a group of consecutive subcarriers in order to reduce the ...

Energy Reduction Strategies in Elastic Optical Networks based on Traffic Aware Distributed GMPLS Control Plane

  • Morea A.
  • Verchere D.

The daily, weekly, and yearly traffic variations and traffic growth as well as energy efficiency strategies based on elastic optical networks, sleep mode and grooming strategies represent a good environment for achieving significant energy savings. We adapt the resources assigned for an optical channel by using a GMPLS distributed control ...

Throughput Comparison between 37.5 and 50GHz Networks: Impact of Add/Drop Blocks and Filter Frequency Response

  • Ghazisaeidi A.
  • Morea A.
  • Renaudier J.
  • Zami T.

We estimate the filtering penalty stemming from optical filters and Add/Drop block architecture, and its implications for the extra throughput provided by 37.5GHz compared to 50GHz grid networks. Multi-Cast Switches joint with sharper filter profiles ensure the desired extra capacity.

Impact of Co-Channel Small Cell Deployments On Uplink Capacity of W-CDMA Cellular Networks

  • Claussen H.
  • Kucera S.

The operation of wireless cellular networks can be efficiently supported by secondary small cells that are deployed on-demand in traffic hotspots within the coverage area of the primary cells. In view of the growing traffic demand and the limited spectrum available, the objective of this study is to examine the ...

Graph Anonymization using Machine Learning, presentation for AINA 2014

  • Ludovic Denoyer
  • Maag M.
  • Patrick Gallinari

Presentation for the paper "Graph Anonymization using Machine Learning" accepted to the conference AINA 2014.

Management of graphs by estimating anonymization parameters using machine learning techniques (PhD Midterm Evaluation)

  • Maag M.

Since the arrival of Web 2.0, the user has become the central actor on the Internet. No longer a passive consumer of published information, the user on the Web has become the central focus with his relationships and interactions at the forefront. New technologies gave to each user the possibility ...

An Approach for Call Logs Anonymization Using Machine Learning

  • Denoyer Ludovic
  • Gallinari Patrick
  • Maag M.

Today it is difficult and in most of the cases it is impossible for a data owner to release call logs in a completely safe environment without any risk of individuals re-identification. However, call logs analysis is very important for research purposes or for marketing applications. Moreover, since the arrival ...

A dimensional comparison between embedded 3D-printed and silicon microchannels

  • Jeffers N.
  • O'Connor J.
  • Punch J.
  • Stafford J.

The subject of this paper is the dimensional characterization of embedded mi- crochannel arrays created using contemporary 3D-printing fabrication techniques. Conven- tional microchannel arrays, fabricated using deep reactive ion etching techniques (DRIE) and wet-etching (KOH), are used as a benchmark for comparison. Rectangular and trapezoidal cross-sectional shapes were investigated. The ...

NNET: a Socket API and protocol stack for Process-to-Content Network Communication

  • Gallo M.
  • Lin Gu
  • Perino D.
  • Varvello M.

Inter-Process Communication (IPC) refers to the set of methods which enable data exchange among processes. When two processes are remote, or run on machines connected via a network, IPC is realized through the socket interface and the networking protocol stack implemented at end-hosts. Today, most computer networks rely on the ...

Investigation of Vapour Chamber Performance with a Concentrated Heat Source

  • Kempers R.
  • Ravache E.
  • Robinson A.
  • Siedel S.

This work aims to characterize the performance of a commercially available solid heat sink (SHS) and a vapour chamber heat sink (VCHS) with a small localized heat source. The heat sinks were tested under forced convection conditions in a dedicated wind tunnel. Heat transfer and temperature measurements facilitated the estimation ...

Development of a naturally aspirated thermosyphon for power amplifier cooling

  • Kempers R.
  • Kerslake S.
  • Robinson A.
  • Siedel S.

This paper details the early development steps of a two-phase thermosyphon thermal management solution for power amplifiers (PA) in the telecommunication industry. These components, attached to a vertical PCB within an enclosure between the RF filter and a natural or forced convection heat sink, dissipate a large amount of heat ...

On the Way to 5G

  • Zakrzewska A.

This presentation analyses new technologies that could enable 5G networking, discusses potential standardisation and development directions, and presents recent research efforts in the area of future mobile networks. This overview was prepared at the Technical University of Denmark (DTU) prior to joining Bell Labs.

Adaptive DC-DC Converter for Efficient 4G Macro-Cell Base Station

  • Ferling D.
  • Fernandéz Y.
  • Jueschke P.
  • Maugars P.
  • Nguyen Trieu Luan Le
  • Philippe D.
  • Retrouvey J.

Abstract—This article presents a new solution for DC-to-DC converters realized for 4G (LTE) macro cell base stations with improved efficiency. The concepts proposed in the EARTH project target a factor two reduction of power consumption in 4G base stations. The solutions are presented and detailed and required DC-to-DC converter specifications ...