ISBN 9783843931243

978-3-8439-3124-3, Reihe Kommunikationstechnik

Zakaria Hanzaz
Optimization of the Link-to-System Interface for the System Level Evaluation based on the LTE System

154 Seiten, Dissertation Technische Universität Kaiserslautern (2017), Softcover, A5

Zusammenfassung / Abstract

Wireless communication systems are developing in a very rapid pace. The high demand on high quality multimedia and being always connected anywhere and anytime requires a technology that supports this high demand in data rates and a wide variety of services. Today, the evaluation and elaboration of such systems are based on computer simulations, because these are a lot cheaper and more flexible than the measurement approach. However, the rapid developments of the various wireless communication systems with numerous functionalities and advanced potential technologies and their evaluation using simulation tools have led to a challenging problem. It is becoming unfeasible to simulate the whole wireless system including all features and aspects of that system. System modeling complexity becomes very huge, costly and requires large amounts of simulation time depending on the system configuration. One novel solution is to split the whole simulation system model into a number of levels or modules. Typically, system performance evaluation is divided into Link Level Simulation (LLS) and System Level Simulation (SLS). The interface between the link level and the system level is called the Link-to-System (L2S) interface. The L2S interface is a means for connecting the two levels of simulations and provides an abstraction model of the link level performance that can be accessed by the system level simulation. Thus, the L2S interface plays a crucial role in the performance evaluation of a wireless system, which is evaluated using system level simulation.

This thesis addresses three connected topics. The first topic concerns the analysis of the L2S interface models such as the Capacity Effective SINR Mapping (CESM) model, the Logarithmic Effective SINR Mapping (LESM) model, the Exponential Effective SINR Mapping (EESM) model, and the Mutual Information Effective SINR Mapping (MIESM) model. The L2S interface models are assessed in terms of accuracy, flexibility, and complexity.

The second topic concerns the enhancement of the Link Adaptation (LA) techniques based on advanced L2S interface models. The considered L2S interface is used as an accurate link error prediction that is a main part of the link adaptation algorithm.

Finally, the overall performance of the system level simulation is evaluated based on the L2S interface models.