Queryable Kafka: An agile data analytic pipeline for mobile wireless networks

Owing to their promise of delivering real-time decisions, today's streaming analytics platforms are increasingly being used in the communications networks, where the impact of the decisions go beyond sentiment and trend analysis to include real-time detection of security attacks and prediction of network state (i.e., is the network transitioning towards ...

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

Localised Dynamics of Laminar Pulsatile Flow in a Rectangular Channel

  • Blythman R.
  • Jeffers N.
  • Murray D.
  • Persoons T.

The exploitation of flow pulsation in low-Reynolds number micro/minichannel flows is a potentially useful technique for enhancing cooling of high power photonics and electronics devices. Although the corresponding mechanical and thermal problems are inextricably linked, decoupling of the local instantaneous parameters provides insight into underlying mechanisms. Using two-dimensional, two-component particle ...

Virtualized environments, from connectivity to services

  • Barnaghi P.
  • Bertin E.
  • Hofmann M.

NFV: Security Threats and Best Practices

  • Dutta A.
  • Lal S.
  • Taleb T.

Network function virtualization (NFV) yields numerous benefits, particularly the possibility of a cost-efficient transition of telco hardware functionalities on the software platform to break the vendor lock-in problem. These benefits come at the price of some security flaws. Indeed, with NFV, virtual mobile networks become vulnerable to a number of ...

5G Network Slicing - Part 2: Algorithms and Practice

  • Banchs A.
  • Capone A.
  • Obana K.
  • Samdanis K.
  • Ulema M.
  • Wright S.

Effective Design of Multi-User Reception and Fronthaul Rate Allocation in 5G Cloud RAN

  • Boviz D.
  • Chen C.
  • Yang S.

Cloud Radio Access Network (C-RAN) is becoming more than ever timely in 5G for dense network deployments, but its design has to be adapted to 5G requirements. To ensure high uplink throughput in cell-edge regions affected by inter-cell interference, C-RAN enables multi-user reception techniques among cells. In this paper, we ...

TinySet-An Access Efficient Self Adjusting Bloom Filter Construction

  • Einziger G.
  • Friedman R.

Bloom filters are a very popular and efficient data structure for approximate set membership queries. However, Bloom filters have several key limitations as they require 44% more space than the lower bound, their operations access multiple memory words, and they do not support removals. This paper presents TinySet, an alternative ...

Radio Channel Modeling for UAV Communication Over Cellular Networks

  • Amorim R.
  • Kovacs I.
  • Mogensen P.
  • Nguyen H.
  • Sorensen T.
  • Wigard J.

The main goal of this letter is to obtain models for path loss exponents and shadowing for the radio channel between airborne unmanned aerial vehicles (UAVs) and cellular networks. In this pursuit, field measurements were conducted in live LTE networks at the 800 MHz frequency band, using a commercial UAV. ...

Outdoor-to-Indoor Empirical Path loss Models: Analysis for Pico and Femto Cells in Street Canyons

  • Castro G.
  • Chizhik D.
  • Feick R.
  • Rodriguez M.
  • Valenzuela R.

The applicability of COST231, WINNER+, ITU-R, and 3GPP urban microcell outdoor-to-indoor path loss prediction models is empirically tested in 100 m radius urban femtocells. The analysis is based on more than 500 link measurements. Considerations not specified in the models such as the inclusion of antenna gains and the effect ...

Nonlinear Frequency Division Multiplexed Transmissions with 64QAM

  • Buelow H.
  • Thai Le S.

Record data rate of 50 Gb/s in nonlinear frequency division multiplexing (NFDM) transmission is experimentally demonstrated using 64 overlapping orthogonal 0.5 Gbaud channels with 64 QAM format, showing an improvement of 1 dB over conventional system at 976 km

Traffic management in SDN-enabled optical packet switching intra-datacenter network

  • Dallaglio M.
  • Dupas A.
  • Dutisseuil E.
  • Mardoyan H.
  • Pointurier Y.
  • Tolosa J.
  • Uscumlic B.
  • Van Q.

Slotted optical packet switching (OPS) is foreseen as future technology for intra datacenter network that will have to provide dynamic reconfiguration capacity, scalability, low latency and QoS guarantees to support fast growing emerging services. In this paper, we describe a prototype based on this technology and reconfigurable thanks to implementation ...

56-Gbps 4-PAM system over nearly 40 km transmission by employing an O-band EML and SOA

  • Chen J.
  • Chen Y.
  • Chuang C.
  • Hong A.
  • Liu J.
  • Nguyen H.
  • Shie B.
  • Wei C.

This work demonstrates a 56-Gbps 4-PAM EML-based transmission system. Using an O-band SOA to increase power budget and FFE/DFE to compensate SOA-induced ISI, 37.8-km transmission is successfully implemented with BER below the FEC limit (2 × 10â?'4)

67.6% Improvement in data rate employing partial transmit sequence for PAPR reduction and volterra filtering in an OFDM long-reach PON

  • Chen J.
  • Chen Y.
  • Chuang C.
  • Hsu C.
  • Liu J.
  • Nguyen H.
  • Wei C.

We applied partial transmit sequence and Volterra filtering to achieve 67.6% improvement in capacity in a high-launch-power 60-km OFDM LR-PON. 61-Gbps capacity and 30-dB loss budget were realized to support 64 ONUs with 0.95 Gbps/ONU.

Topology-aware task placement in small-world optical data center network

  • Guo H.
  • Wang C.
  • Wu J.
  • Zhang D.

Based on the small-world optical data center network architecture, we propose a topology-aw are task placement scheme. Simulation results verified that it can effectively shorten the completion time of computing tasks' data transfer.

Content delivery network slicing: QoE and cost awareness

  • Bagaa M.
  • Flinck H.
  • Retal S.
  • Taleb T.

Content Delivery Networks (CDNs) emerged to manage the great amount of content, as well as the transmissions over long distances. In recent years, this concept proves to be a promising solution for emergent enterprises. In this paper, we present a Content Delivery Network as a Service (CDNaaS) platform which can ...

A simplified deterministic channel model for user mobility investigations in 5G networks

  • Awada A.
  • Enqvist A.
  • Lobinger A.
  • Talukdar A.
  • Viering I.

High frequency bands are considered for the fifth generation (5G) mobile networks to handle the continuous increase in the demand for cellular data traffic. However, the propagation conditions in high frequency bands are more challenging than in low frequency bands, making the radio link more susceptible to obstruction. These new ...

A refactoring approach for optimizing mobile networks

  • Bujari A.
  • Flinck H.
  • Palazzi C.
  • Pozza M.
  • Rao A.
  • Tarkoma S.

Mobile networks are expected to serve a wide range of verticals, however the Long Term Evolution (LTE) network is optimized for basic mobile operator services only. The network functions serving LTE networks are largely implemented as dedicated single function devices that offer poor customization options. This intrinsic inflexibility makes current ...

Optimizing service replication for mobile delay-sensitive applications in 5G edge network

  • Bagaa M.
  • Farris I.
  • Flick H.
  • Taleb T.

Extending cloud infrastructure to the Network Edge represents a breakthrough to support delay-sensitive applications in next 5G cellular systems. In this context, to enable ultrashort response times, fast relocation of service instances between edge nodes is required to cope with user mobility. To face this issue, proactive service replication is ...

Pilot contamination is not a fundamental asymptotic limitation in massive MIMO

  • Bjornson E.
  • Hoydis J.
  • Sanguinetti L.

Massive MIMO (multiple-input multiple-output) provides great improvements in spectral efficiency over legacy cellular networks, by coherent combining of the signals over a large antenna array and by spatial multiplexing of many users. Since its inception, the coherent interference caused by pilot contamination has been believed to be an impairment that ...