The architectures of mobile networks have seen an unprecedented techno-economic transformation, f... more The architectures of mobile networks have seen an unprecedented techno-economic transformation, fusing the telcommunications world within the cloud world, adding the spices of Software Engineering to the overall system design, and ultimately yielding the concept of Telco Cloud. This has brought significant benefits in terms of reducing expenditure and operational costs, flexibility in deployment, and a faster time to market. The key enablers are network function virtualization, software-defined networking, and edge/cloud computing. Artificial intelligence is also kicking in this arena. When all these technologies are well integrated, the creation and life-cycle management of fully programmable, flexible, service-tailored, and automated end-to-end network slices/services become possible. This will support diverse 5G and beyond 5G services, spanning from tactile IoT to pervasive robotics and immersive services. This paper introduces an unprecedented and disruptive vision for 6G that s...
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)
Ultra wideband (UWB) spread spectrum system capacity is studied. User capacity is evaluated analy... more Ultra wideband (UWB) spread spectrum system capacity is studied. User capacity is evaluated analytically against the conditional outage criterion. The probability of outage varies depending on the multipath channel intensity profile, severity of shadowing, signal-to-interference ratio target, number of users, timing errors, and the number of fingers combined in the RAKE receiver. The sum of lognormally distributed signals is mainly modelled by a Fenton-Wilkinson approximation. Numerical results show that the outage performance is quite sensitive to the variation of several key parameters.
This document provides a detailed overview of the Radio Link concepts being developed in METIS as... more This document provides a detailed overview of the Radio Link concepts being developed in METIS as well as a detailed analysis of the related state of the art. For each of the research topics identified for the radio link research covering flexible air interface, new waveforms, modulation and coding techniques as well as multiple access, medium access control and enablers for radio resource management, a detailed description of the aspects to be investigated will be given, going beyond the limits imposed by the systems operated today and their planned evolutions. The state of the art analysis, which is conducted for each of the research topics separately, covers current standards, their future evolutions as well as latest academic research. Elaborating on how the approaches followed in the radio link research may advance this state of the art carves a promising track towards innovative solutions addressing the challenges of future wireless communication.
This document describes the problem space for the METIS research conducted in the radio link cont... more This document describes the problem space for the METIS research conducted in the radio link context. Firstly, a requirement analysis for the air interface design is conducted based on the test case descriptions presented in METIS deliverable D1.1. It follows an introduction of the research topics being pursued in the radio link research together with an illustration of how these topics are addressing the derived requirements. Moreover, it is shown which of those requirements address the needs of the METIS horizontal topics. To facilitate the achievement of these three objectives, a framework of General Requirements is introduced, which will be used throughout the project to assess and evaluate developed radio link solutions and to allow for measuring against the overall system performance goals.
Vehicles are among the fastest growing type of connected devices. Therefore, there is a need for ... more Vehicles are among the fastest growing type of connected devices. Therefore, there is a need for Vehicle-toEverything (V2X) communication i.e. passing of information from a Vehicle-to-Vehicle (V2V) or Vehicle-to-Infrastructure (V2I) and vice versa. In this paper, the main focus is on the communication between vehicles and road side units (RSUs) commonly referred to as V2I communication in a multi-lane freeway scenario. Moreover, we analyze network related bottlenecks such as the maximum number of vehicles that can be supported when coverage is provided by the Long Term Evolution Advanced (LTE-A) network. The performance evaluation is assessed through extensive system-level simulations. Results show that new resource allocation and interference mitigation techniques are needed in order to achieve the required high reliability requirements, especially when network load is high.
In this paper a novel method to evaluate Erlang capacity of intercell interference limited cellul... more In this paper a novel method to evaluate Erlang capacity of intercell interference limited cellular systems is presented. In general the procedure can be applied to systems where the maximum number of active interfering sources is known and relatively low. In order to find the best possible frequency reuse pattern and the most efficient multiple access method a fair platform for capacity comparison is needed. With this method several cellular concepts can be effectively evaluated and compared analytically without extensive simulations. Numerical results show that optimization of the reuse patterns and multiple access methods depends strongly on the desired quality of service constraint.
Wireless Communications and Mobile Computing, 2018
5G system design is a complex process due to a great variety of applications and their diverse re... more 5G system design is a complex process due to a great variety of applications and their diverse requirements. This article describes our experiences in developing a centimeter waves mobile broadband concept satisfying future capacity requirements. The first step in the process was the radio channel measurement campaign and statistical modeling. Then the link level design was performed tightly together with the radio frequency (RF) implementation requirements to allow as large scalability of the air interface as possible. We started the concept development at 10 GHz frequency band and during the project World Radiocommunication Conference 2015 selected somewhat higher frequencies as new candidates for 5G. Thus, the main learning was to gain insight of interdependencies of different phenomena and find feasible combinations of techniques and parameter combinations that might actually work in practice, not only in theory.
Wireless Communications and Mobile Computing, 2017
With increasing popularity of high speed trains and traffic forecast for future cellular networks... more With increasing popularity of high speed trains and traffic forecast for future cellular networks, the need to provide improved data rates using higher frequency bands (HFBs) for train passengers is becoming crucial. In this paper, we modify the OFDM frame structure for HST, taking into account the increasing sensitivity to speed at HFBs. A lower bound on the SNR/SINR for a given rate for reliable communication was derived considering the physical layer parameters from the OFDM frame. We also analyze different pathloss models in the context of examining the required gain needed to achieve the same performance as with microwave bands. Finally, we present a time-based analogue beamforming selection approach for HST. We observed that, irrespective of the pathloss models used, the required gains are within the same range. For the same SNR/SINR at different frequency bands, the achievable data rate varies with respect to the frequency bands. Our results show the potential of the use of H...
2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN), 2016
High frequency (HF) band covers frequencies between 3-30 MHz. With wavelengths of 10-100 m, HF ba... more High frequency (HF) band covers frequencies between 3-30 MHz. With wavelengths of 10-100 m, HF band enables communications over a very long distances though a skywave propagation. As HF band has several benefits like versatility and large coverage area, it suffers phenomena like rapidly changing environment and strong interference. The cognitive radio concept which adapts to the changes in the environment offers tools to solve those problems. In this paper, HF band challenges caused by ionospheric break and interference are solved using databases and complementary codes that adapt to the characteristics of different data transmission requirements. The goal is to optimize used frequencies based on the data transmission needs.
Recent trends show that mobile users accessing the wireless communication network from public tra... more Recent trends show that mobile users accessing the wireless communication network from public transportation vehicles such as the high speed train are on the increase. To serve on-board users effectively, the use of a two-hop communication link is a promising solution. However existing two-hop schemes are expensive technologies and not integral part of the cellular network. We focus on a two-hop integrated cellular link which consists of the base station-to-train link and the train-to-on board users link which is created with the use of moving relay nodes (MRNs). The base station-to-train link is considered in a high speed scenario. We propose an iterative algorithm that can be used to efficiently select the appropriate number of MRNs and receive antennas in relation to the throughput performance and capital expenses.
The architectures of mobile networks have seen an unprecedented techno-economic transformation, f... more The architectures of mobile networks have seen an unprecedented techno-economic transformation, fusing the telcommunications world within the cloud world, adding the spices of Software Engineering to the overall system design, and ultimately yielding the concept of Telco Cloud. This has brought significant benefits in terms of reducing expenditure and operational costs, flexibility in deployment, and a faster time to market. The key enablers are network function virtualization, software-defined networking, and edge/cloud computing. Artificial intelligence is also kicking in this arena. When all these technologies are well integrated, the creation and life-cycle management of fully programmable, flexible, service-tailored, and automated end-to-end network slices/services become possible. This will support diverse 5G and beyond 5G services, spanning from tactile IoT to pervasive robotics and immersive services. This paper introduces an unprecedented and disruptive vision for 6G that s...
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)
Ultra wideband (UWB) spread spectrum system capacity is studied. User capacity is evaluated analy... more Ultra wideband (UWB) spread spectrum system capacity is studied. User capacity is evaluated analytically against the conditional outage criterion. The probability of outage varies depending on the multipath channel intensity profile, severity of shadowing, signal-to-interference ratio target, number of users, timing errors, and the number of fingers combined in the RAKE receiver. The sum of lognormally distributed signals is mainly modelled by a Fenton-Wilkinson approximation. Numerical results show that the outage performance is quite sensitive to the variation of several key parameters.
This document provides a detailed overview of the Radio Link concepts being developed in METIS as... more This document provides a detailed overview of the Radio Link concepts being developed in METIS as well as a detailed analysis of the related state of the art. For each of the research topics identified for the radio link research covering flexible air interface, new waveforms, modulation and coding techniques as well as multiple access, medium access control and enablers for radio resource management, a detailed description of the aspects to be investigated will be given, going beyond the limits imposed by the systems operated today and their planned evolutions. The state of the art analysis, which is conducted for each of the research topics separately, covers current standards, their future evolutions as well as latest academic research. Elaborating on how the approaches followed in the radio link research may advance this state of the art carves a promising track towards innovative solutions addressing the challenges of future wireless communication.
This document describes the problem space for the METIS research conducted in the radio link cont... more This document describes the problem space for the METIS research conducted in the radio link context. Firstly, a requirement analysis for the air interface design is conducted based on the test case descriptions presented in METIS deliverable D1.1. It follows an introduction of the research topics being pursued in the radio link research together with an illustration of how these topics are addressing the derived requirements. Moreover, it is shown which of those requirements address the needs of the METIS horizontal topics. To facilitate the achievement of these three objectives, a framework of General Requirements is introduced, which will be used throughout the project to assess and evaluate developed radio link solutions and to allow for measuring against the overall system performance goals.
Vehicles are among the fastest growing type of connected devices. Therefore, there is a need for ... more Vehicles are among the fastest growing type of connected devices. Therefore, there is a need for Vehicle-toEverything (V2X) communication i.e. passing of information from a Vehicle-to-Vehicle (V2V) or Vehicle-to-Infrastructure (V2I) and vice versa. In this paper, the main focus is on the communication between vehicles and road side units (RSUs) commonly referred to as V2I communication in a multi-lane freeway scenario. Moreover, we analyze network related bottlenecks such as the maximum number of vehicles that can be supported when coverage is provided by the Long Term Evolution Advanced (LTE-A) network. The performance evaluation is assessed through extensive system-level simulations. Results show that new resource allocation and interference mitigation techniques are needed in order to achieve the required high reliability requirements, especially when network load is high.
In this paper a novel method to evaluate Erlang capacity of intercell interference limited cellul... more In this paper a novel method to evaluate Erlang capacity of intercell interference limited cellular systems is presented. In general the procedure can be applied to systems where the maximum number of active interfering sources is known and relatively low. In order to find the best possible frequency reuse pattern and the most efficient multiple access method a fair platform for capacity comparison is needed. With this method several cellular concepts can be effectively evaluated and compared analytically without extensive simulations. Numerical results show that optimization of the reuse patterns and multiple access methods depends strongly on the desired quality of service constraint.
Wireless Communications and Mobile Computing, 2018
5G system design is a complex process due to a great variety of applications and their diverse re... more 5G system design is a complex process due to a great variety of applications and their diverse requirements. This article describes our experiences in developing a centimeter waves mobile broadband concept satisfying future capacity requirements. The first step in the process was the radio channel measurement campaign and statistical modeling. Then the link level design was performed tightly together with the radio frequency (RF) implementation requirements to allow as large scalability of the air interface as possible. We started the concept development at 10 GHz frequency band and during the project World Radiocommunication Conference 2015 selected somewhat higher frequencies as new candidates for 5G. Thus, the main learning was to gain insight of interdependencies of different phenomena and find feasible combinations of techniques and parameter combinations that might actually work in practice, not only in theory.
Wireless Communications and Mobile Computing, 2017
With increasing popularity of high speed trains and traffic forecast for future cellular networks... more With increasing popularity of high speed trains and traffic forecast for future cellular networks, the need to provide improved data rates using higher frequency bands (HFBs) for train passengers is becoming crucial. In this paper, we modify the OFDM frame structure for HST, taking into account the increasing sensitivity to speed at HFBs. A lower bound on the SNR/SINR for a given rate for reliable communication was derived considering the physical layer parameters from the OFDM frame. We also analyze different pathloss models in the context of examining the required gain needed to achieve the same performance as with microwave bands. Finally, we present a time-based analogue beamforming selection approach for HST. We observed that, irrespective of the pathloss models used, the required gains are within the same range. For the same SNR/SINR at different frequency bands, the achievable data rate varies with respect to the frequency bands. Our results show the potential of the use of H...
2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN), 2016
High frequency (HF) band covers frequencies between 3-30 MHz. With wavelengths of 10-100 m, HF ba... more High frequency (HF) band covers frequencies between 3-30 MHz. With wavelengths of 10-100 m, HF band enables communications over a very long distances though a skywave propagation. As HF band has several benefits like versatility and large coverage area, it suffers phenomena like rapidly changing environment and strong interference. The cognitive radio concept which adapts to the changes in the environment offers tools to solve those problems. In this paper, HF band challenges caused by ionospheric break and interference are solved using databases and complementary codes that adapt to the characteristics of different data transmission requirements. The goal is to optimize used frequencies based on the data transmission needs.
Recent trends show that mobile users accessing the wireless communication network from public tra... more Recent trends show that mobile users accessing the wireless communication network from public transportation vehicles such as the high speed train are on the increase. To serve on-board users effectively, the use of a two-hop communication link is a promising solution. However existing two-hop schemes are expensive technologies and not integral part of the cellular network. We focus on a two-hop integrated cellular link which consists of the base station-to-train link and the train-to-on board users link which is created with the use of moving relay nodes (MRNs). The base station-to-train link is considered in a high speed scenario. We propose an iterative algorithm that can be used to efficiently select the appropriate number of MRNs and receive antennas in relation to the throughput performance and capital expenses.
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