• Tuesday, 13 June, 16:30-18:00, Room Theatre Attic Studio
  • Session Chair: Klaus Moessner (University of Surrey, United Kingdom (Great Britain))



16:30 Impact of CoMP VNF Placement on 5G Coordinated Scheduling Performance

Andrea Marotta (University of L'Aquila, Italy); Koteswararao Kondepu (Sculoa Superiore Sant'Anna, Italy); Francesco Giannone (Scuola Superiore Sant'Anna, Italy); Dajana Cassioli and Cristian Antonelli (University of L'Aquila, Italy); Luca Valcarenghi and Piero Castoldi (Scuola Superiore Sant'Anna, Italy)

To address demanding requirements in terms of expected throughput, latency and scalability, 5G networks will offer an unprecedented capacity to support huge volumes of traffic generated by heterogeneous services. Dense small cells deployments provide a valid solution but are prone to high levels of interference especially at the cell-edge. To reduce inter-cell interference and improve cell-edge throughput, a set of techniques known as Coordinated Multipoint (CoMP) has been introduced. Coordinated scheduling (CS) is a CoMP technique that assigns resources to mobile users avoiding that interferent users are assigned the same Physical Resource Blocks (PRBs). On the other hand, Software Defined Mobile Networking (SDMN) and Network Function Virtualization (NFV) represent two key technologies to enhance flexibility and efficiency of resource usage within the Radio Access Network (RAN). Trade-offs deriving from the implementation of CoMP CS techniques on NFV architecture in a dense small cell scenario have not been analyzed yet. In this paper, we propose the joint use of CoMP CS and NFV studying the implications of different deployment strategies, as constrained by the physical topology of the underlying RAN. The performance of both distributed and centralized CoMP CS are compared in terms of convergence delay and traffic overhead. Guidelines for the optimal design are provided.


16:48 5G Radio Access Network Architecture Based on Flexible Functional Control / User Plane Splits

Jakob Belschner (Deutsche Telekom AG, Germany); Nico Bayer and Paul Arnold (Telekom Innovation Laboratories, Germany); Gerd Zimmermann (Deutsche Telekom AG, Germany)

5G networks are supposed to offer a high flexibility in a several ways. In this regard, a twofold split of the processing in the radio access network is under discussion: A control plane / user plane split to support the software defined networking principle and a radio protocol stack layer based split to allow a flexible placement of processing functions between a central and distributed units. In this work, the motivation and state of the art for both splits are described including a discussion of the advantages and disadvantages. It is followed by a description of a network architecture allowing a flexible implementation of these splits. This especially focuses on the required interfaces between control and user plane.


17:06 Routing Protocols for Video Surveillance Drones in IEEE 802.11s Wireless Mesh Networks

Charles Jumaa Katila, Antonio Di Gianni, Chiara Buratti and Roberto Verdone (University of Bologna, Italy)

In this paper we consider a video surveillance application, using a camera mounted on a drone flying over the area to be monitored and sending the video to a control center (CC). In order to ensure connectivity between the drone and the CC some relays are deployed on the ground. The resulting network is composed of a static component (relays), and a moving component (the drone). All network devices are assumed to be equipped with IEEE 802.11s air interfaces. The goal of our work is to design and validate a routing protocol appropriate for this scenario. The IEEE 802.11s standard proposes Hybrid Wireless Mesh routing Protocol (HWMP) composed of a proactive tree-based routing and the reactive Radio Metric Ad-hoc On-Demand Distance Vector (RM-AODV) scheme to support mesh networks. To address the need for reliable connectivity, faster and resource-efficient path discovery, we envisage a mixed optimized scheme, called Optimized-Hybrid Wireless Mesh Protocol (O-HWMP), where both, RM-AODV and the proactive tree-based scheme, are used at the same time. In O-HWMP the output of the tree-based routing scheme provides input to the RM-AODV, in order to reduce flooding of control packets, and to minimize delays during path discovery. Through NS3-Evalvid simulations we demonstrate that, compared to RM-AODV scheme, our proposed protocol significantly improves network performance in terms of delays, packet success rate, overhead cost, and peak-signal-to-noise-ratio metric of the received video.


17:24 Self-organizing Mesh Topology Formation in Internet of Things with Heterogeneous Devices

Dudu Ok and Furqan Ahmed (KTH Royal Institute of Technology, Sweden); Mohit Agnihotri (KTH Royal Institute of Technology & Eindhoven Technical University, Sweden); Cicek Cavdar (KTH Royal Institute of Technology, Sweden)

This paper focuses on the design of self-organizing algorithms for mesh topology formation between low-power short-range heterogeneous devices. To this end, we consider randomly deployed devices that are heterogeneous in terms of characteristics such as energy source (e.g. mains, rechargeable battery, and coin-cell), computational resources, and communication capabilities. Resilient topology formation is considered in a Bluetooth based setting, where devices communicate locally to form pico-nets comprising of devices in master and slave roles. These pico-nets are connected via primary and secondary bridges that forward the traffic between the pico-nets. A role suitability metric based on the device characteristics (e.g. energy source and number of neighbors) is used to assign appropriate roles to devices. By energy aware RSM based topology formation, more than 100% increase in network lifetime over the baseline approach is achieved. And by adding secondary bridges between piconets ≈ 35% further increase in network lifetime is shown.


17:42 Experimental-based Propagation Model for VLC

Lorenzo Mucchi (University of Florence, Italy); Francesco Saverio Cataliotti (LENS Università di Firenze & Dip. Energetica, Università di Firenze, Italy); Luca Simone Ronga (Self Employed, Italy); Stefano Caputo and Patrizio Marcocci (University of Florence, Italy)

In this paper we investigate, through experimental measurements, a propagation model of the visible light. The scope is to come up with a fine tuned propagation model which also accounts for reflection from the optical bench. The experiments were conducted in the European Laboratory of Non Linear Spectroscopy (LENS). The proposed propagation model can be used to evaluate the performance of visible light communications, in particular in the context of indoor applications.