Fairness and resource allocation in device-to-device wireless regional area network

With the rapid development in wireless devices, applications and networks, radio frequencies have become scarce resources. Therefore, it is critical to make efficient use of the radio frequencies. A promising way to solve this problem is the use of cognitive radio (CR). In CR, radio frequencies are allocated to licensed users, also called...

PPP–RTK theory for varying transmitter frequencies with satellite and terrestrial positioning applications

In this contribution, we generalize PPP–RTK theory by allowing the transmitters to transmit on different frequencies. The generalization is based on the integer-estimability theory of Teunissen (A new GLONASS FDMA model. GPS Solutions, 2019). As the theory and associated algorithms provided are generally applicable, they apply to satellite...

An All-Digital PLL for Cellular Mobile Phones in 28-nm CMOS with -55 dBc Fractional and -91 dBc Reference Spurs

We propose a time-predictive architecture of an all-digital PLL (ADPLL) for cellular radios, which is optimized for advanced CMOS. It is based on a 1/8-length time-to-digital converter (TDC) of stabilized 7-ps resolution, as well as wide tuning range, and fine-resolution class-F digitally controlled oscillator (DCO) with only switchable metal...

Assessment of spatio-temporal traffic dynamics in mobile networks and its exploitation towards operational cost reduction

The environmental policy of KPN has an objective of reducing CO2 emissions and energy consumption to contribute in making the planet more sustainable. This thesis project researches the potential for reducing energy consumption and, consequently, the operational costs of the KPN LTE network. There are various resources in a mobile network which...

Voice over LTE

Long Term Evolution (LTE) is the latest high speed mobile broadband technology that is gaining widespread attention due to its high data rates and improved Quality of Service (QoS). Initially, LTE was seen as a technology for supporting high speed data, but there is a growing interest in the industry to support voice over LTE. The support of...

Combining relaying and base station coordination for improving cell-edge multi-user performance in 3GPP LTE-Advanced networks

The emphasis of this thesis work is placed on improving cell-edge multi-user performance in 3GPP LTE-Advanced networks by utilizing relaying and base station coordination technologies. Relaying is a technology for enhancing the transmissions between two locations on a radio path and base station coordination is a multi-cell processing technology...

Flexible and Programmable Evolved Packet Core: A New SDN-based Model

The mobile core network experienced many transformations during the past decade and at this moment virtualisation constitutes the next big phase in the operators strategies. Another technology which might step in the coming years is Software Defined Networking (SDN), a more mature technology in data centers, which strives to revolutionize the...

Downlink Scheduling in 3GPP Long Term Evolution (LTE)

LTE is the evolution of the Universal Mobile Telecommunications System (UMTS). A scheduler assigns the shared resources (time and frequency) among users terminals. I have examined the impact of different scheduling schemes on the throughput and I also have investigated the fairness of each scheduling scheme. The main contribution of this thesis...

LTE Performance Measurement In Trial Network & Validation Of LTE Performance Estimation Models

The drawback of theoretically based modeling approaches are that they lack knowledge about the performance and practicalities of the LTE radio interface features observed in realistic deployments. In this thesis, the problem is addressed by first measuring the LTE radio performance from a small scale trial network and by later comparing the...

Evaluation of Relay-Enhanced LTE-Advanced Networks

The Third Generation Partnership Program's Long-Term Evolution Advanced (3GPP LTE-Advanced) group is developing a new standard for mobile broadband access that will meet the throughput and coverage requirements of a fourth generation cellular technology. The key goals for this evolution are increased data rate, improved spectrum efficiency,...

Virtual Sectorization in Future Mobile Networks: System-Level Assessment and Optimization in a Realistic LTE Network

Virtual Sectorization (ViS) is proposed as a solution to cope with the exponential growth of data traffic in mobile networks. Through the use of an Active Antenna System (AAS), two vertically separated beams (serving two distinct cells) are created within the original coverage area of a macro-cell. One of these cells, referred to as virtual cell...

Assessment of Dynamic Spectrum Allocation in Realistic Mobile Networks

Since the advent of radio communications, radio spectrum has been increasingly getting crowded with different kinds of applications. Different radio communications systems have been developed for various purposes and multiple actors became interested in using these systems at the same time and space. Such situation inevitably led to the point...

LPWAN Performance Enhancement for IoT in the Smart Grid

With the proliferation of IoT devices across the globe, the adoption of IoT related technologies has been increasing rapidly. Newer technologies which fall in the category of Low Power Wide Area Network (LPWAN) have increased this adoption even further. A lot of research is being done in LPWAN licensed band as well as unlicensed band...

LTE System Performance in Relation to Wideband Channel Properties

In the current radio planning of wireless cellular networks, analysis of system performance is based on Signal to Noise Ratio (SNR). However, for wideband system such as LTE, the performance depends not only on the SNR but also on the amount of frequency and spatial diversity that the system can exploit. These diversities rely on the delay and...

A base station system study for LTE, UMTS and GSM/EDGE

Communication systems evolve day after day at a very fast pace. People not only have high expectations in regard of the conversation quality, but they also need more data download speeds and better coverage. The industry tries to come and fill in this expectation by developing state-of-the art systems that are cost-effective and that ensure good...

Development of custom multi-band LTE antenna for telemetric applications: Custom design vs. existing commercial LTE antennas

The final goal of this thesis is to figure out if it is possible to design an eight-band LTE antenna for <$0,20 with the same performance, quality and tunability as the current available eight-band LTE antennas. In the introduction the state of the art is presented where the most common currently available comparableantennas and modules are...