Ingolf Karls

Quasi-deterministic approach to mmWave channel modeling in a non-stationary environment

There is increasing faith that mmWave technology will be part of 5G wireless networks in the wide frequency range 30-90 GHz. Experimental measurements are used to model mmWave channels addressing issues like human body shadowing or reflections due to moving vehicles. In this paper a new quasi-deterministic (Q-D) approach is introduced for modeling mmWave channels. The proposed channel model allows natural description of scenario-specific geometric properties, reflection attenuation and scattering, ray blockage and mobility effects. This new channel modeling approach is of utmost importance for further measurement campaigns planning, channel model characterization, system level simulations and network access capacity estimations.

Agile resource management for 5G: A METIS-II perspective

An explosive growth in the demand for higher data rates and capacity along with diverse requirements set by massive and ultra-reliable machine-type communications are the main drivers behind the development on new access technologies as part of the fifth generation (5G) networks. Currently, different air interface (AIF) and/or AIF variants, optimized based on the frequency band of operation and use case, are envisioned for such a network. Developing an agile resource management framework for 5G networks is one of the main goals of the METIS-II project. The METIS-II project builds strongly upon the EU flagship project METIS, which has laid the foundation of 5G. This framework will take into account the multi-link and multi-layer constraints currently envisioned for 5G. In this paper, we provide our first insights into agile resource management and the associated synchronous control functions. We will discuss the essential building blocks in terms of technology enablers and their mapping to 5G services and deployments. The introduced agile resource management framework for 5G is expected to enable enhanced interference management, dynamic traffic steering, fast radio access network (RAN) moderation, efficient context management, and optimized integration with legacy networks.

The Evolution and Technology Adaptations of 4G

This chapter provides a comprehensive view of the challenges facing current 4G networks and how the evolution toward 5G is expected to overcome them. We will explain many of the future requirements that can already be met with LTE Advanced Pro, and will discuss the operational and implementation challenges in current LTE networks and related end-user experiences.

The Disruptor: The Millimeter Wave Spectrum

The fast development of smart and connected products, including consumer electronics, means that for the best user experience, wireless networks need to operate in frequency bands both below and above 6 GHz. The millimeter wave spectrum, as noted in previous chapters, is mainly driven by the ever-increasing number of extreme broadband applications and services. First there are many opportunities, since spectrum allocations have been and will be offered for millimeter wavelengths (10 mm to 1 mm) and frequencies (30 to 300 GHz) for wireless mobile communication. Second, important development tools have now been prepared for the millimeter wave spectrum, including channel models, link level and system level simulation (LLS and SLS), antenna and baseband, and radio front-end design. The third source of this growth is that applications are now being planned or developed for these frequencies that go far beyond those already in the market, like automotive radar, wireless broadband fixed access, and satellite communications. Finally there is the unbelievable development and progress of semiconductor technology that will make the implementation of millimeter wave communication feasible for 5G.

Introduction to Mobile Wireless Systems

The evolution of wireless systems has taken place in a remarkably short time, delivering incredible technology advances that have changed the way people communicate and interact with each other. Those advances have come in several generations; the mobile wireless communication journey started with 1G, followed by 2G, 3G, 4G, and now 5G, the standard currently under specification. Each generation of wireless systems followed different evolutionary paths toward two unified targets: delivering greater performance and efficiency, and doing so in highly complex network deployments.

Evolving from 4G to 5G

5G will lead us into an “all-time connectivity society” where mobile devices will play an even more important role in people’s lives. 5G will be not only a cellular standard but a combination of cellular and other heterogeneous standards. In this chapter we will focus on the cellular characteristics of 5G.