Spatial and Temporal Channel Characteristics of 5G 3D Channel Model with Beamforming for User Mobility Investigations

High carrier frequencies are an integral part of the upcoming fifth generation (5G) mobile networks as they offer high data rates and increase the quality of experience. To compensate for the high path loss at high carrier frequencies, beamforming is applied resulting in users connecting and switching between beams of ...

Scaling photonic lanterns for space-division multiplexing

  • Alvarado-Zacarias J.
  • Amezcua Correa R.
  • Antonio Lopez J.
  • Antonio-López J.
  • Chen H.
  • Fontaine N.
  • Hernández-Cordero J.
  • Leon-Saval S.
  • Okonkwo C.
  • Ryf R.
  • Sillard P.
  • Velazquez Benitez A.

We present a new technique allowing the fabrication of large modal count photonic lanterns for space division multiplexing applications. We demonstrate mode-selective photonic lanterns supporting 10 and 15 spatial channels by using graded index fibres and microstructured templates. These templates are a versatile approach to position the graded index fibres ...

Long-haul optical transmission link using low-noise phase-sensitive amplifiers

  • Andrekson P.
  • Astra E.
  • Eliasson H.
  • Karlsson M.
  • Olsson S.

The capacity and reach of long-haul fiber optical communication systems is limited by in-line amplifier noise and fiber nonlinearities. Phase-sensitive amplifiers add 6 dB less noise than conventional phase-insensitive amplifiers, such as erbium-doped fiber amplifiers, and they can provide nonlinearity mitigation after each span. Realizing a long-haul transmission link with ...

Analyzing and predicting the spatial penetration of Airbnb in U.S. cities

  • Capra L.
  • Greatorex A.
  • Musolesi M.
  • Quattrone G.
  • Quercia D.

In the hospitality industry, the room and apartment sharing platform of Airbnb has been accused of unfair competition. Detractors have pointed out the chronic lack of proper legislation. Unfortunately, there is little quantitative evidence about Airbnb?s spatial penetration upon which to base such a legislation. In this study, we analyze ...

Prototyping Optical Ethernet - A Network for Distributed Data Centers in the Edge Cloud

  • Dembeck L.
  • Gebhard U.
  • Lautenschlaeger W.

Low latency requirements are driving the data center business into the metro area, the so-called Edge Cloud. We investigate the new networking requirements and how they can be served by our Optical Ethernet framework. We elaborate, why the Edge Cloud requires true packet switching in the metro network instead of ...

Making Cable Networks Ready For The Future Through Operations Benchmarking

The current telecommunications business is characterized by fierce competition between Multi System Operators (MSOs) and Communication Service Providers (CSPs) (both called "CSP" in the rest of this paper), flat revenues, and rising network demands and stressing costs. A high percentage of cost is in network OPEX can be attributed to ...

Silicon Photonics: a Scaling Technology for Communications and Interconnects

Silicon photonics exploits CMOS processes to fabricate passive and active photonic circuits on silicon substrates. Its various technical merits implies that this technology can offer superior scalability in terms of integration level and energy efficiency for optical links, two key perspectives to fulfill sustainable capacity growths in future telecom, datacom, ...

Balancing flow table occupancy and link utilization in software-defined networks

  • Chao H.
  • Chen K.
  • Guo Z.
  • Gushchin A.
  • Liu R.
  • Walid A.
  • Xu Y.

Software-Defined Networking (SDN) employs a centralized control with a global network view and provides great opportunities to improve network performance. However, due to the limitation of flow-table space at the switches and unbalanced traffic allocation on links, an SDN may suffer from flow-table overflow and inefficient bandwidth allocation among flows, ...

Erratum to: Long-haul optical transmission link using low-noise phase-sensitive amplifiers (Nature Communications, (2018), 9, 1, (2513), 10.1038/s41467-018-04956-5)

  • Andrekson P.
  • Astra E.
  • Eliasson H.
  • Karlsson M.
  • Olsson S.

The original version of this Article incorrectly listed an affiliation of Samuel L.I. Olsson as ?Thomas Johann Seebeck Department of Electronics, Tallinn University of Technology, Tallinn 19086, Estonia?, instead of the correct ?Present address: Nokia Bell Labs, 791 Holmdel Road, Holmdel, NJ 07733, USA?. Similarly, Egon Astra had an incorrect ...

Design and measurement of a 5G mmW mobile backhaul transceiver at 28 GHz

  • Destino G.
  • Korvala A.
  • Kursu O.
  • Leinonen M.
  • Pärssinen A.
  • Pettissalo M.
  • Rahkonen T.
  • Sonkki M.
  • Tammelin S.
  • Tervo N.

High throughput and ultra low latency are the main requirements for fifth generation (5G) mobile broadband communications. Densely populated urban environments require utilization of previously underutilized millimeter wave frequency spectrum for higher data rates. The Ka-band, previously used in satellite applications, is of particular interest to terrestrial 5G mobile networks. ...

Fast Approximation Algorithms for p-Centers in Large ? -Hyperbolic Graphs

  • Edwards K.
  • Kennedy W.
  • Saniee I.

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. We provide a quasilinear time algorithm for the p-center problem with an additive error less than or equal to 3 times the input graph?s hyperbolic constant. Specifically, for the graph G= (V, E) with n vertices, m edges and hyperbolic ...

Signal Ratio Detection and Approximate Performance Analysis for Ambient Backscatter Communication Systems with Multiple Receiving Antennas

© 2017, Springer Science+Business Media, LLC, part of Springer Nature. Recently, ambient backscatter attracts much attention since it can utilize ambient radio frequency signals to enable battery-free devices to communicate with others. Most existing studies about ambient backscatter assume that the reader is equipped with one receiving antenna. In practice, ...

Towards Modeling Cross-Domain Network Slices for 5G

Network Slicing (NS) is expected to be a key functionality of the upcoming 5G systems and coupled with Software Defined Networking (SDN) and Network Function Virtualization (NFV), NS will enable a flexible deployment of Network Functions belonging to multiple Service Function Chains (SFC) over a shared infrastructure. To address the ...

Benchmarking the ONOS Intent interfaces to ease 5G service management

The use cases of the upcoming 5G mobile networks introduce new and complex user demands that will require support for fast reconfiguration of network resources. Software Defined Network (SDN) is a key technology that can address these requirements, as it decouples the control plane from the data plane of the ...

Self-Healing and Resilience in Future 5G Cognitive Autonomous Networks

  • Ali-Tolppa J.
  • Bodrog L.
  • Kajo M.
  • Kocsis S.
  • Schultz B.

In the Self-Organizing Networks (SON) concept, self-healing functions are used to detect, diagnose and recover degraded states in the managed Network Functions (NFs) or other resources. Such methods are increasingly important in future network deployments, since ultra-high reliability is one of the key requirements for the future 5G networks, for ...

Towards Cognitive Autonomous Networks in 5G

Cell densification and new Radio Access Technologies (RATs) have been the solutions towards improving area-spectral efficiency to serve the ever-increasing traffic demand. However, these solutions lead to increased cost and complexity of network design and operation. The solution thereto is globally agreed to be further network automation, specifically, by embedding ...

Everything you wanted to know about the testing, but you were too afraid to ask

Presentation for HackYeah 2018, where we were discussing test theory in basis, some consequences of lack/poor testing and reasons why we need to tests. Also simple test methodologies were presented.

Efficient Measurement on Programmable Switches Using Probabilistic Recirculation

Programmable network switches promise flexibility and high throughput, enabling applications such as load balancing and traffic engineering. Network measurement is a fundamental building block for such applications, including tasks such as the identification of heavy hitters (largest flows) or the detection of traffic changes. However, high-throughput packet processing architectures place ...

Sphinx won't bite you! Documenting Python Code

The importance of a well-documented code is known to anyone who has ever encountered a code without documentation... sometimes their own. Right next to readability of the code lays its documentation. Every programmer knows that even a single example of code usage can put them on the right track and ...

Time brings all things to pass

  • Witecki K.

When testing asynchronous and parallel software one can run into different race conditions. One can experience races between different parts of system or races between test environment and system under test. When wombined with arbitrary timeouts used extensively in the system complexity becomes hard to harness. Imperfect solutions include waiting ...