Mobile Communications


In the broad field of mobile communications our group focuses on three main topics within the scope of next generation mobile cellular networks: link layer measurements and simulations, traffic analysis and simulation at the IP layer and cross-layer optimizations.

Research Topics

In the broad field of mobile communications our group focuses on three main topics within the scope of next generation mobile cellular networks: link layer measurements and simulations, traffic analysis and simulation at the IP layer and cross-layer optimizations.

In the field of the evolution towards Long Term Evolution (LTE) and beyond, a strong, years-long cooperation with mobilkom austria AG, now A1 Telekom Austria, the leading Austrian fix and mobile operator, keeps ongoing. The cooperation with A1 in the field of 4G mobile networks is focused on receiver, scheduling, and network optimization by means of both link and system-level optimization. Of special interest is the modeling of future performance of actual network deployments and its optimization, as well as receiver optimization for LTE-A, including higher-order MIMO receivers, energy efficient transmissions, and optimized channel estimators for high speeds.

In cooperation with Kathrein-Werke KG, one of the leading antenna manufacturers, real-time test beds have been developed, which include an LTE MIMO test bed. Complementing measurement campaigns, simulation tools have also been developed, which include the only existing open-source physical level and network level LTE simulators and now also LTE-A (>25.000 downloads worldwide).

In cooperation with the networking group of the Telecommunications Research Center Vienna (ftw.) we refine analysis methods and traffic models for packet switched traffic in next generation cellular mobile networks together with industry partners such as Kapsch Carrier Com (KCC), Alcatel-Lucent (ALU) as well as Mobilkom Austria and Telekom Austria (now A1 Telekom). The DARWIN3 (Data Analysis and Reporting for Wireless Networks) project, a successor of the METAWIN and DARWIN projects, is a measurement system for data and signaling traffic within the packet-switched LTE/UMTS/GPRS core network. At the current state this system is capable to detect and track data flows and derive service parameters for old (e.g. email) and new (e.g. online gaming) services on a per user level. The anonymized measurements drawn from a live mobile network are used for further research on optimization of performance and security as well as anomaly detection. The information obtained from this research is also used to evaluate and develop enhanced receiver concepts for UMTS HSDPA and LTE, and we are building models for simulation and optimization of these networks based on traffic maps extracted in the live network.

The research topic of Traffic Generation and Modelling is studied within the LOLA project. The LOLA (Achieving LOw-LAtency in Wireless Communications) project is an FP7 project in collaboration with seven different partners all over Europe, namely: EURECOM, Thales, Linköping University, AT4, Ericsson and Telecom Serbia. The focus of LOLA is on access-layer technologies targeting low-latency robust and spectrally-efficient transmission in a set of emerging application scenarios. Research is focused on LTE-A and meshed networks technologies in support of gaming services and machine-to machine (M2M) applications in mobile environments. The Institute participates as a work package leader in the area of Traffic Generation and Modeling.

The dedicated course plan in mobile communications attracts students from all over the world. International socializing is an activity already in the master program: together with ETH Zurich and TU Munich we offer an International Seminar on Mobile Communications. Furthermore, in cooperation with the Technical Universities of Bratislava and Brno, we conduct a seminar series in Bratislava, Brno, and Vienna, as part of the Mobile Communications Seminar lecture.

Projects

H2020 ADWICE: Advanced Wireless Technologies for Clever Engineering

The project Advanced Wireless Technologies for Clever Engineering (ADWICE) is aimed to create a strong partnership between the research center of Sensor, Information and Communication Systems (SIX, Czech Republic) and Vienna University of Technology (TUW, Austria). QS World University Rankings sets TUW on the 91st position among engineering faculties worldwide. The partnership will result in the transfer of excellence in research from TUW to SIX.

SIX is located in the region of South Moravia. The regional innovation strategy 2014-2020 (RIS) identifies (1) electrical engineering, (2) information technologies, (3) mechanical engineering and (4) life sciences as dominant sectors of the regional economy. SIX contributes (1) to (3).

Smart specializations of South Moravia identified by RIS are (1) Advanced manufacturing & engineering, (2) Accurate instruments, (3) Hardware & software, (4) Pharmaceuticals, medical care & diagnostics, and (5) Aeronautical technologies. Wireless technologies can find exploitation in all these specializations which is documented by letters of intent provided by companies.

The ADWICE project consists of work-packages covering (1) Sensor systems, (2) Signal processing, (3) Radiofrequency applications, (4) Mobile communications and (5) Cyber security. Work-packages:

– Are co-supervised by a TUW leader and a SIX one;
– Contribute to (1) Smart cities, (2) Mobility for growth, and (3) Digital security;
– Are associated with companies.

The ADWICE project will result in a sustainable network comprising companies, SIX and TUW. The network will strengthen the innovation potential of companies thanks to the applied research of SIX and TUW. The network will cooperate on common research, education and dissemination. Operation of the network will be financed from private sources (contributions of companies) and public ones (national funds, HORIZON 2020). Research in the initial phase (2015-2019) will be funded by the National Sustainability Program.

Contact: Philipp SVOBODA, Projektass. Dipl.-Ing. Dr.techn.

 

Methodical Solution for Cooperative Hybrid Performance Analytics in Mobile Networks

This project is funded by the FFG in the context of BRIDGE. The ITC joins forces with the A1 Telekom Austria AG. In the scope of this project, we will try to answer the question of how well crowdsourced measurements can be improved by combining different measurement sources.

In this project, we enable monitoring of services and customers in mobile networks. The main objectives of this project can be summarized as follows:

  • Mathematical framework for modelling and analysis of benchmarking methods in reactive networks.
  • Study of the automatic detection of service classes based on machine learning algorithms.
  • Development of a method to combine active and passive measurement systems to a hybrid distributed measurement system.
  • Investigation of correlation between generic benchmarking of network parameters and quality of experience (QoE) metrics.
  • Derive methods for machine learning of QoE metrics in real-time.
  • Advance the methodology towards a distributed measurement system, which allows for crowd sourced data analysis.
  • Evaluation through experiments: Providing tools that either identify the actual network state or advise how to reach the optimal state for high quality solutions.
  • Forecasting the network state by using time series approaches, to serve the right resources at the right time.

Contact: Philipp SVOBODA, Projektass. Dipl.-Ing. Dr.techn.

 

EU FP7 Project LoLa: Achieving Low-Latency in Wireless Communications

The focus of LOLA is on access-layer technologies targeting low-latency robust and spectrally-efficient transmission in a set of emerging application scenarios. We consider two basic types of wireless networks, namely long-range LTE-Advanced Cellular Networks and medium-range rapidly-deployable mesh networks. Research on low-latency transmission in cellular networks is focused firstly on transmission technologies in support of gaming services which will undoubtedly prove to be a strategic revenue area for operators in the years to come. Secondly, we also consider machine-to-machine (M2M) applications in mobile environments using sensors connected to public infrastructure (in trains, busses, train stations, utility metering, etc.). M2M is an application area of extremely high growth potential in the context of future LTE-Advanced networks. A primary focus of the M2M research is to provide recommendations regarding PHY/MAC procedures in support of M2M to the 3GPP standardization process. The rapidly-deployable mesh topology component addresses M2M applications such as remote control and personnel/fleet tracking envisaged for future broadband civil protection networks. This work builds upon ongoing European research in this important area. Fundamental aspects of low-latency transmission are considered in addition to validation on real-time prototypes for a subset of the considered application scenarios. The cellular scenario validation is carried out using both live measurements from an HSPA test cell coupled with large-scale real-time emulation using the OpenAirInterface.org emulator for both high-performance gaming and M2M applications. In addition, a validation testbed for low-layer (PHY/MAC) low-latency procedures will be developed. The rapidly-deployable wireless mesh scenario validation makes use of the real-time OpenAirInterface.org RF platform and the existing FP6 CHORIST demonstrator interconnected with commercial M2M equipment.

Contact: Philipp SVOBODA, Projektass. Dipl.-Ing. Dr.techn.

 

The Vienna LTE Simulators

The Vienna LTE Simulators are a large software project that originated in the context of a bilateral cooperation with A1 Telekom and was co-financed by Prof. Christoph Mecklenbräuckers Christian Doppler Laboratory on Wireless Technologies for Sustainable Mobility. The Vienna LTE Simulators are a suit of Matlab-based Link- and System-Level Simulators for 3GPP LTE and LTE-Advanced. For academic use, the simulators are freely available for download and support reproducibility of research in wireless communications and signal processing for mobile networks. Please see our dedicated Vienna LTE Simulators webpage for additional details and more information.

Contact:

Link Level Simulators: Stefan SCHWARZ, Univ. Ass. Dipl.-Ing. Dr.techn.

System Level Simulator: Martin TARANETZ, Univ. Ass. Dipl.-Ing. Dr.techn.

 

Research Collaboration with General Motors Advanced Technical Centre Israel

Since 2014, a contract research project with General Motors is running within our research group. The research project focuses on the utilization of mobile communications technology in vehicular environments and follows the developments withint 3GPP standardization. 3GPP has recently initiated a new study item within Release 14 of Universal Mobile Telecommunications System (UMTS) Long Term Evolution (LTE) on vehicular communications: Study item on LTE support for V2X services (V2XLTE). The goal is to develop a set of LTE specifications for vehicular environments (LTE-V) to enable support of connectivity in-between vehicles – vehicle to vehicle (V2V) – to roadside infrastructure – vehicle to infrastructure (V2I) – and to people in the proximity of connected cars – vehicle to pedestrian (V2P), as illustrated below. In general, vehicular communications is mainly considered for one of the following three use cases with distinct quality of service (QoS) requirements: 1) high-bandwidth infotainment applications for in-car users and proximity services; 2) delay- and outage-critical active road safety; 3) traffic efficiency applications without strict requirements (graceful degradation of QoS). The project aims at investigating these possibilities utilizing our Vienna LTE Simulators.

Contact: Stefan SCHWARZ, Univ. Ass. Dipl.-Ing. Dr.techn.

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