SDN ‐ based WiFi ‐ VLC Coupled 5G System

In IEEE WoWMoM 2018 conference, I presented our work on an SDN-based WiFi-VLC Coupled System for Optimised Service Provision in 5G Networks. Visible Light Communication (VLC) is a powerful supplement, which has gained tremendous attention recently and has become a favorable technology in short-range communication scenarios for the Fifth Generation (5G) networks. VLC possesses a number of prominent features to address the highly demanding 5G system requirements for high capacity, high data rate, high spectral efficiency, high energy efficiency, low battery consumption, and low latency. However, this prominent performance is limited by the imperfect reception, since line of sight channel condition may not always exist in practice. The paper presents and experimentally validates a SDN-assisted VLC system, which is coupled with WiFi access technology in order to improve the reliability of VLC system, reassuring zero packet loss reception quality due to misalignment or path obstructions or when the user is moving between two consecutive VLC transmitters and experience “dead coverage zones”.

fig1

The experimental setup of this paper includes an SDN network domain, which is controlled by Ryu controller that is capable of executing python-based SDN apps. The CPE is a laptop equipped with a USB VLC receiver and an Arduino-based luminance detector, placed next to the VLC dongle.

The experimental topology complements the VLC technology with a 2.4GHz WiFi 802.11g access point, which was used in the experiment as a dynamically coupled access technology for the zones that the user has poor reception quality, such as the dead reception zones between two successive VLC transceivers. An SDN app was developed in order to handle the seamless switching of the access technology (i.e. WiFi or VLC) used each time in order to maintain good reception quality.

fig2As it was expected, while the user is moving away from the center of the LED light, the lx value (and respectively the SNR value) is decreasing, which means that the reception quality drops and the http-streaming video service from normal playback is starting to appear occasional pauses. Gradually the lx value reaches to zero as the users is located in a dead reception zone between two successive lamps, where the video service provision is paused/interrupted (packet loss reaches 100%/blue line). The video service playback re-initiates when the user reaches the coverage area of the next VLC transmitter, since all the lamps are broadcasting the same content, and therefore the distance from the next light source is decreasing and therefore the lm value and the SNR value are gradually increasing.

The experiment was repeated placing the CPE at the same distances, but with the SDN controller enabled and the proposed SDN-app active and properly configured. The user requested the HTTP streaming video service and once the service started, she/he started to move from distance equal to zero with step of 30cm, towards the next VLC lamp. When she/he covered a distance of two meters (i.e. at the dead coverage zone between the two lamps), then the packet loss started to increase (as is it observed in the figure above in oragne). Then the SDN-app detected the loss of the ctrl_messages via the VLC channel and once the window of 2 seconds had been completed, the SDN-app instructed via the SDN Controller appropriate Openflow commands to be applied on the OVS switch for diverting the downloading flow to WiFi. The switching process performed seamlessly to the end-user, which resulted in maintaining the video service delivery intact, without any service interruption or quality degradation.

Read the full paper. Available here.

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Workshop on User-centric network management and service provisioning

Workshop on User-centric network management and service provisioning

September 17-19, 2018, Barchelona, Spain

(in conjunction with IEEE CAMAD 2018, http://camad2018.ieee-camad.org/)

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Scope and Topics of Interest
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The natural evolution of software and hardware technology, driven by the constantly increasing demands for high-quality communications,
has brought new and innovative advancements like Software Defined Networking (SDN) and Network Functions Virtualization (NFV).
These advancements have not left the mobile telecom sector unaffected. Already, 5G visionaries recognize SDN and NFV as the key enabling
technologies for dynamic and agile networking. More specifically, SDN is used for the decoupling of the control and data plane of a
service-related network flow, while NFV is standardized as the technology that will virtualize storage, computing and networking resource management.
Driven by these advancements, the 5G networks are expected to provide the potential for flexible end-to-end orchestration and slicing, allowing the
automated network configuration and service provision. This automation will enable multiple interacting application components, such as massive IoT
application, Big data analytics and multimedia services to be delivered via multiple access technologies, such as millimeter waves, visual light
communication and others. In this automated environment, the consumers of mobile services are placed for the very first time at the epicenter of any
communication system and access technology in contrast to previous system-centric network designs. The so-called user-centricity is actually so powerful, that terms like
Quality of Experience (QoE) have been coined, driven by the need to understand end users’ degree of satisfaction. In parallel, the main stakeholders
in mobile service provisioning, namely a) the service or content providers, usually referred to as Over-The-Top (OTT) service providers, and b) the
traditional Mobile Network Operators (MNO) promote QoE as the most crucial factor for assessing the network’s, access technology’s and/or application’s
impact on a service in the diverse ecosystem.

This workshop focuses on bringing together researchers from academia, industry and SDOs to identify and discuss technical challenges and novel ideas, regarding a variety of topics, including, but not limited to:

* Human-in-the-loop 5G architectures
* Human-intense 5G communications
* Human-intense network services
* User-centric service and network management
* User experience and perception in SDN/NFV enabled systems
* User-behavior analysis
* User’ perception for interactive security and privacy mechanisms
* SDN/NFV-enabled QoE estimation methodologies and metrics
* SDN/NFV-enabled QoE estimation tools
* QoE-oriented SDN/NFV applications and platforms
* SDN/NFV-related business considerations and economic aspects of QoE
* SDN/NFV-enabled QoE-adaptive algorithms for resource sharing
* QoE-adaptive algorithms for video streaming
* SDN/NFV-based service orchestration
* SDN/NFV-based network deployment and optimisation
* Visual light Communication technologies in the 5G architecture
* Multi-access and multi-radio Access Technologies and Orchestration
* End-to-end orchestration for immersive services
* Big data analytics and machine learning for flexible mobile service steering

The workshop is organized by the research projects CASPER (http://casper-h2020.eu/) and IoRL (http://iorl.5g-ppp.eu/)

————————————————————————
Important Dates
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* Paper Submission Deadline: 31 May 2018
* Author Notification: 2 July 2018
* Camera Ready: 31 July 2018

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Submission Instructions
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Prospective authors are invited to submit a full paper of not more than six (6) IEEE style pages including results,
figures and references. Papers should be submitted via EDAS. Papers submitted to the conference, must describe unpublished
work that has not been submitted for publication elsewhere. All submitted papers will be reviewed by at least three TPC members.
All accepted and presented papers will be included in the conference proceedings and IEEE digital library.

Conference site: http://camad2018.ieee-camad.org/
Workshop Submission Link: https://www.edas.info/newPaper.php?c=24497&track=91100

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Workshop Co-chairs
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Dr. Dimitris Tsolkas, dtsolkas@di.uoa.gr, Dept. of Informatics & Telecommunications University of Athens, Greece
Dr. Harilaos Koumaras, koumaras@iit.demokritos.gr, Institute of Informatics and Telecommunications NCSR Demokritos, Greece

User-centric Communications and Content Delivery

“User-centric Communications and Content Delivery”, IEEE CAMAD 2017, June 19-21, 2017, Lund, Sweden.

The workshop is organized by CASPER, a H2020 MSCA-RISE project (http://casper-h2020.eu/), as part of the IEEE Computer-Aided Modeling Analysis and Design of Communication Links and Networks (CAMAD) conference (http://ieee-camad.org/).

The rapid growth of multi-modal media services, ranging from conventional video conferencing to interactive immersive experiences, necessitates user-centric methodologies and approaches in order to assess and evaluate the perceived multimedia quality. Towards this direction, the key challenge is to understand Quality of Experience (QoE) notion and define QoE provisioning chains in the era of 5G networks, by incorporating advanced capabilities on: i) storage/computing/network resource management; ii) central service and network orchestration; iii) network softwarisation; and iv) Big data analytics. Although some important steps have been made in this direction, new advanced solutions are required towards: i) best match network performance metrics to end-consumers’ satisfaction level; ii) fully exploit QoE insights to take advantage of new technologies and networking tools; and iii) well define QoE-oriented business models and marketing schemes.

In this context, the workshop focuses on bringing together researchers from academia and industry to identify and discuss technical challenges and novel ideas, regarding a variety of topics, including, but not limited to:

  • QoE evaluation methodologies and metrics
  • QoE-based network monitoring and troubleshooting
  • QoE-based service and network management
  • QoE provisioning over SDN/NFV -enabled networks
  • QoE-based adaptive video streaming
  • QoE for emerging interactive applications (Immersive/360 video, Gaming, Haptics)
  • Prediction and learning algorithms for QoE provisioning
  • QoE-oriented applications and platforms
  • Testbeds and online tools for QoE evaluation (Crowd-sourcing, Field testing, etc.)
  • Datasets for QoE validation and benchmarking
  • Media analytics from QoE Big Data

IMPORTANT DATES

Submission deadline: March 20, 2017

Notification of acceptance:  April 14, 2017
Submission of camera-ready papers:  April 23, 2017

SUBMISSION INFORMATION

Perspective authors are invited to submit their papers using the EDAS system, through the following link:

https://edas.info/newPaper.php?c=23206&track=84434

Authors should submit a full paper of not more than five (5) IEEE style pages including results, figures and references. Papers will be reviewed with the standard reviewing procedure (with at least 3 independent anonymous reviews). Accepted papers will be published on IEEExplore (http://ieeexplore.ieee.org/ ).

The TPC co-chairs:

Dr. Luigi Pomante: Email: luigi.pomante@univaq.it

Dr. Dimitris Tsolkas, Email: dtsolkas@di.uoa.gr

Dr. Kostas Ramantas, Email: kramantas@iquadrat.com