09:30 am: Impact of RAN virtualization on fronthaul latency budget: an experimental evaluation
Abstract: In 3GPP an architecture of the New Radio (NR) has been defined where the evolved Node B (eNB) functions can be split between a Distributed Unit (DU) and Central Unit (CU). Furthermore, in the virtual RAN (VRAN) approach, such functions can be virtualized (e.g., in simple terms, deployed in virtual machines). Based on the split type, different performance in terms of capacity and latency are requested to the network (i.e., fronthaul) connecting DU and CU. This study experimentally evaluates, in the 5G segment of the Advanced Research on NetwOrking (ARNO) testbed (ARNO-5G), whether the fronthaul latency requirements specified by Standard Developing Organizations (SDO) (3GPP in this specific case) are met. Moreover it evaluates how much virtualization impacts the fronthaul latency budget for the the Option 7-1 functional split. The obtained results show that in the considered Option 7-1 functional split the fronthaul latency requirements are about 250 us but they depend on the radio channel bandwidth and the number of the connected UEs. Finally virtualization further decreases the latency budget.
09:45 am: 5G Multi-Service Field Trials with BF-OFDM
Abstract: Multi-service transmissions are expected in the upcoming fifth-generation (5G) of cellular networks. These heterogeneous applications lead to many constraints that need to be addressed in a flexible way. We investigate the division of the bandwidth into several subbands, each having a different service and numerology. This work highlights and demonstrates the possible coexistence of Broadband (eMBB), Ultra-Reliable Low-Latency (uRLLC) and new IoT (eIoT) services within the same channel using a flexible waveform. We describe field test experiments done with an implementation of the BF-OFDM physical layer on prototype hardware boards. Field trials results confirm the potential of BF-OFDM and the feasibility of the use of mixed numerologies for the next generation of cellular network.
10:00 am: mmWave-based Mobile Backhaul Transceiver for High Speed Train Communication Systems
Abstract: This paper presents a testbed for evaluating feasibility and potential effectiveness of the mmWave-based mobile backhaul transceiver in a high speed train communication system. Employing a hierarchical relay network architecture where each user inside a train accesses the network with the aid of an onboard relay deployed at the train, practical obstacles from large train carriage penetration loss and group handover can be easily resolved. We provide design and implementation details of the proposed mobile relay-based network architecture, namely mobile hotspot network (MHN). We focus on baseband and RF front-end, which are able to support over-Gbps data rate per train in a mmWave band at a very high mobility up to 500 km/h. We also provide an actual field trial result in Seoul subway line 8 as well as an indoor lab test result. The subway test results show that around 1.25 Gbps downlink data rate is attainable along most of the actual subway paths.
10:15 am: Turning the knobs on OpenFlow-based resiliency in mmWave small cell meshed networks
Abstract: As a solution to cope with the increase of wireless network traffic for future 5G networks, the IEEE 802.11ad standard enables multi-gigabit connectivity within the 60 GHz spectrum. Since these networks typically have low range, a vast number of small cells is required to form a wireless backhaul that can be easily affected by temporary failures due to blockage/interference. Software-defined Networking (SDN) is a paradigm that allows the centralization of the control plane management, which can be applied to mmWave wireless backhaul networks. Using SDN enables the possibility of having resilience mechanisms in the network, such as Fast-Failover (FF) group tables in the OpenFlow (OF) protocol. In this paper, we analyse resilient forwarding configurations upon temporary link failures. We perform our evaluation on a 4 small cell testbed with multiple IEEE 802.11ad interfaces, showing how OF-based resiliency can be applied, through FF and the Bidirectional-Forwarding Detection (BFD) protocol. Our results show how BFD can be tuned to improve the link state monitoring, and how a local reactive failover mechanism can benefit ongoing traffic in small cell meshed backhaul networks.
11:15 am: Narrowband IoT service provision to 5G User Equipment via a satellite component
Abstract: Today an estimated 15 billion of connected objects communicate with each other's. These connected objects that compose the Internet of Things (IoT) are expected to extend to 50 or 80 billion worldwide by 2020. Bringing wide-area connectivity for the IoT using satellite technology is therefore an attractive solution to complement terrestrial networks, allowing densification and coverage extension in remote areas. This paper deals with seamless integration of satellites and high altitude platforms (HAPS) into 5G networks. It describes the necessary modifications to operate on 5G systems in order to take satellite and HAPS specifics into account. Link budget calculations and system dimensioning, including channel modeling, are provided to determine the required satellite and HAPS performance as well as to estimate the number of served users per km².
11:30 am: Towards E2E Slicing in 5G: A Spectrum Slicing Testbed and its Extension to the Packet Core
Abstract: The next generation of cellular networks (5G) is expected to provide a huge step forward in terms of network capacity, reduced latency and reliability. Due to the large variety of applications and services, the mobile network is expected to deliver a differentiated quality of experience-QoE depending on the major application scenarios expected in 5G. To provide the necessary flexibility and reconfigurability of the 5G architecture, network resource partitioning/slicing is expected to provide an efficient and cost effective way of delivering the required QoE. However, few testbeds are available to analyze the pros and cons of such technology, as well as to enable a proper performance evaluation. This paper proposes an outline of the ongoing implementation of a 5 end-to-end network slicing testbed. The testbed is based on an open-source software Long Term Evolution-LTE protocol stack, OpenAirInterface, which operates on Software-defined Radio-SDR devices, EXPRESSMIMO2 board, extended to implement and demonstrate slicing in a 5G scenario.
11:45 am: A Flexible IoT RAN System Based on SDR with Optimal Antenna Distribution
Abstract: We construct and test a novel, simple yet flexible architecture based on software-defined radio for 5G IoT network. In our system, separation of radios and baseband processing facilitates sharing of radio heads among different L1 or L2 standards, while centralization of processing unit allows sharing of computation resources, coordination of radio heads and easier management. A problem is raised about how to dynamically assign a large number of radio heads in a network with vastly different transmitter counts and locations. We therefore propose a low-complexity antenna distribution algorithm which we prove is optimal for the lowest system error rate. In addition, the fact that our algorithm changes assignment incrementally makes it more suitable for time-varying networks. We construct a testbed according to this architecture. High integration and cost reduction are achieved by the use of a single ARM+FPGA system-on-chip. Experiment results show the system exhibits near ultra-low latency with high reliability. These characteristics combined with the reconfigurability of both ARM and FPGA make the system an ideal choice for real-time, highly reliable and multi-standard IoT applications.
12:00 pm: Radio Virtual Machine
Abstract: Reconfigurable Radio assumes that the radio hardware platform is reconfigurable in such a way that the essential radio characteristics (carrier frequencies, spectrum bandwidth, modulation technique, coding technique, output power levels, and etc.) can be changed according to the flexibility of hardware platform that is defined by manufacturers. Corresponding radio hardware platforms are heterogeneous by nature and include computational elements with different level of programmability or reconfiguration. This paper addresses the problem of software portability and its generalization for reconfigurable platforms. Main contribution of this article is to present a novel architecture of the virtual domain-specific machine, namely, Radio Virtual Machine (RVM), which provides an efficient implementation of calculations related to radio signal processing in hardware platforms of different nature.
12:15 pm: Radio Equipment Directive - A novel Software Reconfiguration Framework
Abstract: The European Commission recently published the revision of the novel Radio Equipment Directive 2014/53/EUreplacing the R&TTE Directive which has been in force since 1999. This Directive represents the basic regulation framework for the making available of radio equipment on the Single European Market. Among several changes, the new RED includes specific provisions enabling the usage Software Reconfiguration for Radio Equipment in Europe. At the same time, ETSI has developed a novel Software Radio Reconfiguration framework specifically meeting the requirements of the Directive and encompassing technical, certification and security solutions. This paper introduces and comments the related changes on the regulation level and introduces the ETSI solution which is ready to be applied for new type of radio equipment to be introduced in Europe.