Žunić, S. (2014). Coordinated scheduling and beamfoming in coordinated multi-point transmission systems [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2014.10162
multi base station coorperation to improve cell capacity and cell edge user performance; coordinated beamforming versus fast selection versus coherent transmission
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MIMO; LTE
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Abstract:
Wireless cellular networks are currently experiencing a tremendous growth of data trac. The resulting network densi cation leads to ever-increasing levels of Inter- Cell Interference (ICI) that cannot be managed with (semi)-static interferenceavoidance schemes deployed in 3GPP Long Term Evolution (LTE) systems. Coordinated Multi-Point (CoMP) transmission is therefore adopted in LTE Advanced, the next development stage of LTE. The basic idea of CoMP is to enhance network performance by mitigating ICI through cooperation between several network cells. Among the CoMP schemes, Coordinated Beamforming (CB) and Coordinated Scheduling (CS) stand out, as they do not rely on the exchange of user data between network nodes and thereby avoid additional network overhead. Instead, the network nodes coordinate their scheduling decisions and precoder design in order to minimize ICI and increase system throughput, especially at the cell edge. During the last decade, a multitude of algorithms achieving this objective has been proposed. But until now, no systematic study of their performance has been conducted. This thesis aims to characterize and evaluate the performance of multiple proposed CB and CS schemes in a downlink multi-cell system. First, the fundamentals of LTE-A as well as the system model are introduced. CB is described next, CB algorithms are derived and evaluated by means of Monte Carlo simulations. The concept of CS is outlined, followed by a detailed description of a CS algorithm and Monte Carlo simulations. Besides throughput and spectral eciency, fairness is also taken into account. The simulation results show that CoMP transmission signi cantly improves the system performance.
de
Wireless cellular networks are currently experiencing a tremendous growth of data trac. The resulting network densi cation leads to ever-increasing levels of Inter- Cell Interference (ICI) that cannot be managed with (semi)-static interferenceavoidance schemes deployed in 3GPP Long Term Evolution (LTE) systems. Coordinated Multi-Point (CoMP) transmission is therefore adopted in LTE Advanced, the next development stage of LTE. The basic idea of CoMP is to enhance network performance by mitigating ICI through cooperation between several network cells. Among the CoMP schemes, Coordinated Beamforming (CB) and Coordinated Scheduling (CS) stand out, as they do not rely on the exchange of user data between network nodes and thereby avoid additional network overhead. Instead, the network nodes coordinate their scheduling decisions and precoder design in order to minimize ICI and increase system throughput, especially at the cell edge. During the last decade, a multitude of algorithms achieving this objective has been proposed. But until now, no systematic study of their performance has been conducted. This thesis aims to characterize and evaluate the performance of multiple proposed CB and CS schemes in a downlink multi-cell system. First, the fundamentals of LTE-A as well as the system model are introduced. CB is described next, CB algorithms are derived and evaluated by means of Monte Carlo simulations. The concept of CS is outlined, followed by a detailed description of a CS algorithm and Monte Carlo simulations. Besides throughput and spectral eciency, fairness is also taken into account. The simulation results show that CoMP transmission signi cantly improves the system performance.
en
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