Optimizing Synchronous Handover in Cloud RAN

  • Gimenez L.
  • Kolding T.
  • Pedersen K.

Radio networks are at the brink of a transformation in order to meet new requirements for high data and device densities expected for the Internet-of-Things (IoT) era. Cloud technology is positioned to be a key element in building effective 5G radio networks, so-called Cloud RANs. In this paper, we focus ...

Transport Network Design for FrontHaul

  • Bouillard A.
  • Deiss T.
  • Mathieu F.
  • Sehier P.

The evolution of LTE and advent of 5G networks increases further the bandwidth requirements for Radio Access Network (RAN). In parallel, the deployment of Centralized RAN architecture raises new challenges on the FrontHaul network. The inflexibility of the legacy Common Public Radio Interface (CPRI) is the primary challenge to Virtualized ...

Applying Neural Networks in Optical Communication Systems: Possible Pitfalls

  • Buelow H.
  • Eriksson T.
  • Leven A.

We investigate the risk of overestimating the performance gain when applying neural network based receivers in systems with pseudo random bit sequences or with limited memory depths, resulting in repeated short patterns. We show that with such sequences, a large artificial gain can be obtained which comes from pattern prediction ...

On the Bit Error Rate of Optical Transmission Systems Corrupted by Bivariate Additive White Gaussian Noise

  • Bigo S.
  • Delezoide C.
  • Essiambre R.
  • Frignac Y.
  • Jenneve P.
  • Layec P.
  • Ramantanis P.

We derive in integral form the exact Bit Error Probability for QPSK constellations corrupted by elliptic AWGN. We show that for an in-phase/quadrature noise the performance only depends on the overall Signal to Noise Ratio and not on noise ellipticity.

Impact of Software Defined Contention in OXC at network level

  • Zami T.

This study quantifies how software defined contention influences the number of MCS-based add/drop stages needed to serve a given set of connections, over 2 distinct WDM network topologies.

Numerical Investigation and Scaling Rules for the Estimation of Nonlinear Interference Variability of Dispersion Managed and Unmanaged Systems in Presence of PMD and Kerr Effects

  • Fazel S.
  • Frignac Y.
  • Ramantanis P.
  • Rossi N.

We estimate the Kerr nonlinear noise variance for WDM-PDM QPSK links and its variability in presence of PMD. Results specify rules giving the PMD-based NLI statistics and its evolution with distance for both legacy and recent coherent link designs. Introduction Prediction of Quality of Transmission (QoT) has been actively investigated, ...

Duobinary IQ Modulation Schemes for C- and O-band PAM4 Direct Detect Systems

  • Buchali F.
  • Buelow H.
  • Chagnon M.
  • Dischler R.
  • Eriksson T.
  • Stephan Ten Brink

We present two novel modulation schemes for PAM4 direct detect systems employing duobinary signals as least and most significant bit. One format, designed for C-band, is experimentally demonstrated at 70 GBaud. The other, for O-band, is compared to conventional PAM4.

Achieving Near Maximum Ratio Combining Diversity Gains With Directive Antennas

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

We present an empirically based comparison of the effectiveness of spatial and angular diversity systems in outdoor-to-indoor fixed wireless links. We concentrate on the simple to implement, single RF-chain selection diversity systems. We find that for such systems, angular diversity very significantly outperforms spatial diversity using comparatively sized arrays. This ...

Performance analysis of frequency domain simulator of multi-UE E-UTRAN fading channel with intercarrier interference

This paper presents a recent result of the study on efficient 3GPP compliant method to simulate multiple independent multipath fading radio channels in multi-UE (User Equipment) software defined Evolved Universal Terrestrial Radio Access Network (E-UTRAN) traffic generator. In the previous research [1], authors discussed Digital Fourier Transform (DFT) based frequency ...

32-degree OXC with very low add/drop contention

  • Zami T.

This study reports a colorless/directionless wavelength routing Optical Cross-Connect (OXC) based on multicast switch partially equipped with variable splitters, to achieve a 32-degree OXC with negligible add/drop contention probability and still with reasonable intermediate amplification.

Fully monolithic integrated silicon photonics slave transceiver for short-reach network

  • Chen Y.
  • De Valicourt G.
  • Dong P.
  • Kakande J.
  • Sinsky J.
  • Tkach R.

We demonstrate an ultra-compact monolithic integrated silicon-based slave transceiver integrating a D-BPSK receiver and a polarization insensitive reflective modulator. We successfully achieved 25 Gbit/s OOK-NRZ modulation for the upstream and 25 Gbit/s D-BPSK detection for the downstream as well as transmission over the full C-band and few km.

Data plane protocols and fragmentation for 5G

  • Kantola R.
  • Tilli J.

Mobile networks up to this point have used general packet radio service (GPRS) tunneling protocol (GTP) in the core network. The fifth generation (5G) will be a major revolution in mobile networks and there have been discussions onto adopting a different protocol, with the proposals being generic routing encapsulation (GRE), ...

Impact of cyclic prefix configuration on mobility performance of multi-connectivity in 5G networks

  • Awada A.
  • Fettweis G.
  • Simsek M.
  • Tesema F.
  • Viering I.

Service interruptions from mobility events, such as handovers and connection failures, are some of the major impairments for fulfilling the ultra-reliability requirements in fifth Generation (5G) mobile networks. One of the solutions to tackle the aforementioned challenges is multi-connectivity with Single Frequency Network (SFN) transmission, which refers to noncoherent joint ...

Energy efficiency of 5G mobile networks with base station sleep modes

  • Hronec M.
  • Jolma P.
  • Lahdekorpi P.
  • Moilanen J.

The paper presents system level simulation results on future base station energy saving using a time-triggered sleep model. The energy efficiency of future base station is compared in macro cellular network against a comparable baseline without usage of sleep modes. Furthermore, results for corresponding 4G case are shown using a ...

Machine learning using neural networks in digital signal processing for RF transceivers

  • Fischer G.
  • Jueschke P.

Communication is changing to a wireless world. Any wireless communication system needs radio frontends (transceivers) to link higher layer signals to the air interface. The increasing standard and technology diversity require transceivers with high flexibility supporting many of frequencies, standards and signal requirements. Design to cost, the demand for highest ...

NoSQL stores for coreless mobile networks

  • Flinck H.
  • Ojala F.
  • Rao A.
  • Tarkoma S.

The goals of 5G networks â?" low latency, high bandwidth, and support for fast mobility â?" are non-trivial and they demand improvements across all involved technology fields. Researchers are therefore exploring approaches that leverage on network function virtualization and software-defined networking for meeting the demands of verticals expected to use ...

Holistic resource management and air interface abstraction models

  • Bulakci Ö.
  • Ericson M.
  • Fodor G.
  • Gutierrez-Estevez D.
  • Karimi P.
  • Moya F.
  • Prasad A.

Resource Management (RM) in fifth generation (5G) radio access network has been the subject of extensive study in recent years. An agile RM framework should encompass greatly-improved services from previous mobile network generations along with advanced new services meeting the challenging requirements, like massive data rate and ultra-low latency. The ...

Enhancements of narrowband IoT in 3GPP Rel-14 and Rel-15

  • Bhatoolaul D.
  • Mangalvedhe N.
  • Ratasuk R.
  • Robert M.
  • Xiong Z.

In 3GPP Rel-13, a narrowband system, named Narrowband Internet of Things (NB-IoT), has been introduced to provide low-cost, low-power, wide-area cellular connectivity for the Internet of Things. Further enhancements have been made to this system in subsequent 3GPP releases. In this paper, we describe Rel-14 enhancements that have been standardized ...

RAN enablers for 5G radio resource management

  • Arnold P.
  • Belschner J.
  • Bulakci Ö.
  • Calochira G.
  • Ericson M.
  • Gutierrez-Estevez D.
  • Pateromichelakis E.
  • Prasad A.

This paper presents the description of several key RAN enablers for the radio resource management (RRM) framework of the fifth generation (5G) radio access network (RAN), referred to as building blocks of the 5G RRM. In particular, the following key RAN enablers are discussed: i) interference management techniques for dense ...

An overview of standardization efforts for enabling vehicular-to-everything services

  • Husain S.
  • Kunz A.
  • Prasad A.
  • Samdanis K.
  • Song J.

The Third Generation Partnership Project (3GPP) has been working on developing specifications on Machine to Machine Communications (M2M) and on the emerging Internet of Things (IoT) bringing light into the associated service and network requirements. This paper presents a special form of M2M/IoT communication, where at least one communication device ...