Beschreibung: Cellular connectivity plays an important role for the future development of automated and connected driving and intelligent traffic. An internet connection based on a 5G network can offer new services as entertainment (media streaming) or traffic information for improved navigation and cruising. Development and testing automotive antenna designs is time consuming and expensive. An open question is the evaluation of different antennas within a realistic environment. To fill this gap and facilitate optimal antenna design we introduce three scoring indicators to compare automotive antennas for cellular mobile communications and estimate their performance. This approach can be applied both to measured data and simulation results. The indicators help to make decisions on the type of integrated antenna by considering throughput as well as network coverage.

Beschreibung: The communication between two devices (D2D) plays an important role for future networks such as
Internet of Things (IoT) or Intelligent Transport Systems (ITS). A challenging task is the simulation of the physical layer in highly dynamic networks with a large number of moving devices. Nowadays, such simulations are mostly performed using stochastic channel models completely neglecting specific spatial effects. Ray optical path loss predictions (Raytracing), considering 3D building data, are
often seen as not suitable for large networks due to their high complexity combined with their long processing time. In this paper, we introduce a novel calculation method that leads to a significant speed-up of Raytracing predictions. The approach analytically investigates a scenario and
precalculates the visibility between all static surfaces. The changing propagation paths of moving devices can quickly be determined even for higher orders of reflection.

Beschreibung: Long Term Evolution Advanced (LTE-A) describes the latest evolution of the mobile network standard of the 3rd Generation Partnership Project (3GPP). Cellular wireless communication standards, such as LTE-A, are primarily developed for the content distribution of user specific data via unicast transmissions. The exponential growth in data traffic in mobile networks might require alternative approaches for content distribution in order to relief network cells from load congestion. The 3GPP evolved Multimedia Broadcast Multicast Service (eMBMS) and Single-Cell Point-to-Multipoint (SCPTM) enable multicast/broadcast transmissions of content as an alternative transmission layer to the unicast transmission layer. SC-PTM and eMBMS rely on the existing Low Tower, Low Power (LTLP) infrastructure of current mobile access networks and utilize the same carrier, effectively reducing the number of resources available for unicast services. The Tower Overlay over LTE-Advanced+ (TOoL+) system was developed by Technische Universitaet Braunschweig and field tested together with partner organizations GatesAir, Rai and TDF. It introduces an additional transmission layer by offloading popular content to a dedicated broadcast carrier transmitted from a High Tower, High Power (HTHP) infrastructure. The associated modifications of the LTE-A standard are indicated by the term ’LTE-A+’. To evaluate the capabilities of the TOoL+ system in a realistic environment, we integrated the existing broadcast solutions for LTE-A and TOoL+ into the Simulator for Mobile Networks (SiMoNe) environment, a software platform for realistic mobile network simulations on the system level, also developed by Technische Universitaet Braunschweig. In this paper, we present the implementation details and evaluate the impact of the different broadcasting layers on cell loads in a realistic network scenario.