Table of Contents

## What is link level simulation?

The Link Level Simulator (LLS) is used to simulate a point-to-point communication link, and evaluates metrics such as bit/block error rate for a given signal to interference and noise ratio (SINR).

**What is system level modeling?**

System-level simulation (SLS) is a collection of practical methods used in the field of systems engineering, in order to simulate, with a computer, the global behavior of large cyber-physical systems.

**What is meant by system simulation?**

System simulation is the process of experimenting with, and studying how changes to characteristics of a complex system (or sub-system) impact the system as a whole. Advanced simulation software uses mathematical algorithms to predict and illustrate the impact of proposed system changes.

### How does a simulation work?

A simulation uses a mathematical description, or model, of a real system in the form of a computer program. This model is composed of equations that duplicate the functional relationships within the real system.

**What are simulator types?**

There are three (3) types of commonly uses simulations: [1]

- Live: Simulation involving real people operating real systems. Involve individuals or groups.
- Virtual: Simulation involving real people operating simulated systems.
- Constructive: Simulation involving simulated people operating simulated systems.

**What are types of simulation?**

Simulation can be broken down into three overarching types, as follows:

- Discrete Event Simulation. Modelling a system as it progresses through time, for example;
- Dynamic Simulation. Modelling a system as it progresses through space, for example;
- Process Simulation.

## Why simulation is needed?

Simulation modeling solves real-world problems safely and efficiently. It provides an important method of analysis which is easily verified, communicated, and understood. Across industries and disciplines, simulation modeling provides valuable solutions by giving clear insights into complex systems.

**Can a link-level simulator be used for LTE downlink analysis?**

… In [5], a simple physical layer model is proposed for LTE in order to reduce the complexity of system level analysis. In [6], a link-level simulator for LTE downlink is presented as an appropriate interface to a system level simulator.

**What does LTE stand for?**

The Long-Term Evolution (LTE) is the next generation of current mobile telecommunication networks. LTE has a new flat radio-network architecture and a significant increase in spectrum efficiency. In this paper, a computationally-efficient tool for dynamic system-level LTE simulations is proposed.

### What is 3GPP LTE?

3GPP LTE is the evolution of UMTS which will make possible to deliver next generation high quality multimedia services according to the usersâ€™ expectations.