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Papers by Efstathios Katranaras
Zenodo (CERN European Organization for Nuclear Research), Nov 30, 2022
This document describes the technical work and solutions of iNGENIOUS on air interface and device... more This document describes the technical work and solutions of iNGENIOUS on air interface and device connectivity for next generation Internet-of-Things (IoT) applications. In short, this deliverable targets at explaining the communication performance evaluation and analysis of IoT technologies and devices, the proposed innovations for efficient air interface and versatile communication applied to heterogeneous IoT networks, the relationship of these technical efforts to the project's architecture and use cases, as well as their exploitation potential.
The 5GCAR project aims to contribute to 5G network design, and specifically to design V2X technol... more The 5GCAR project aims to contribute to 5G network design, and specifically to design V2X technology components for V2X use case classes identified in the project. The requirements on reliability, latency, data rates, spectral and energy efficiency cannot be fully supported by today’s wireless networks and V2X solutions and call for novel and innovative approaches, including the design of a new radio interface.
Zenodo (CERN European Organization for Nuclear Research), Sep 30, 2022
This document provides an overview of the iNGENIOUS cross-layer architecture. The focus is on com... more This document provides an overview of the iNGENIOUS cross-layer architecture. The focus is on component groups within the overall architecture and how their integration and cooperation enable the related iNGENIOUS innovations.
In order to quantify the energy savings in wireless networks, a holistic view of the power consum... more In order to quantify the energy savings in wireless networks, a holistic view of the power consumption of the entire system needs to be captured. This requires an appropriate energy efficiency evaluation framework. In this deliverable, we present the necessary enhancements over existing performance evaluation frameworks for the wireless networks. The main objective is to capture the factors affecting the energy efficiency at component, node and network level. The most important additions to the existing frameworks include: (1) a sophisticated power model for various BS types, that maps the RF output power radiated at the antenna elements to the total supply power necessary to operate the network; (2) an approach to quantify the energy efficiency of large geographical areas by using the existing small scale deployment models along with long term traffic models; (3) a suitable set of metrics that allows quantifying the amount of energy savings capturing the most important trade-offs b...
This deliverable presents the work executed in the first 15 months of the iNGENIOUS<br> pro... more This deliverable presents the work executed in the first 15 months of the iNGENIOUS<br> project with regards to dissemination, communication, standardization, exploitation,<br> and innovation.
IEEE Transactions on Communications, 2012
This document provides an overview of the iNGENIOUS cross-layer architecture. The main purpose of... more This document provides an overview of the iNGENIOUS cross-layer architecture. The main purpose of this deliverable is to reach a common understanding of the project at a technical level among all consortium partners and those supporting the project from outside.
This Data Management Plan describes the management life cycle for the data to be collected, proce... more This Data Management Plan describes the management life cycle for the data to be collected, processed, and generated by the iNGENIOUS project. This document also includes information on the data format, dissemination, and preservation plans in line with the FAIR (Findable, Accessible, Interoperable and Reusable) Data Management Protocols.
This deliverable defines and compile the different scenarios gathered in six use cases that are r... more This deliverable defines and compile the different scenarios gathered in six use cases that are relevant for the project as part of the supply chain ecosystem. For each use case, partners have defined explicit requirements and KPIs (both network and service related) that will be targeted on the development phase.
2020 International Wireless Communications and Mobile Computing (IWCMC)
Vehicle to Everything (V2X) communication has been a topic of great interest for the past decade.... more Vehicle to Everything (V2X) communication has been a topic of great interest for the past decade. Lately, a push from the automotive industry and regulators for inclusion of advanced use cases towards autonomous vehicles, has led to the search for improved solutions that can support the respective features. In this paper, Hybrid Automatic Repeat Request (HARQ) feedback solutions are explored in the context of group communications (groupcast) in cellular V2X. A solution is provided to combine reliability improvements while using the least possible amount of sidelink resources. Furthermore, for the case where members of the group are out of communication range of the transmitter, it is suggested to use the feedback response for selecting another member of the group to forward the message.
With the emergence and continuous growth of wireless data services, the value of wireless network... more With the emergence and continuous growth of wireless data services, the value of wireless networks is not only defined by how many users it can support, but also by its ability to concentrate large amounts of data capacity at localized spots. Information theory provides a mathematical framework which quantifies the maximum achievable data rate over a communication channel. More importantly, information theoretic study for capacity of cellular systems suggests base station cooperation as a mean of overcoming inter-cell interference limitations. The aim of this thesis is to investigate the information theoretic capacity of the cellular uplink. In order to quantify the performance of the current and future engineering solutions, the designers need to know the rate limits that a particular multi-user cellular system can provide and how far from the limit, lays the efficiency of their design. The gap between the information theoretic limit and the performance of currently known systems w...
Cellular V2X for Connected Automated Driving
IEEE Access, 2016
One major advantage of cloud/centralized radio access network (C-RAN) is the ease of implementati... more One major advantage of cloud/centralized radio access network (C-RAN) is the ease of implementation of multicell coordination mechanisms to improve the system spectrum efficiency (SE). Theoretically, large number of cooperative cells lead to a higher SE, however, it may also cause significant delay due to extra channel state information (CSI) feedback and joint processing computational needs at the cloud data center, which is likely to result in performance degradation. In order to investigate the delay impact on the throughput gains, we divide the network into multiple clusters of cooperative small cells and formulate a throughput optimization problem. We model various delay factors and the sum-rate of the network as a function of cluster size, treating it as the main optimization variable. For our analysis, we consider both base stations' as well as users' geometric locations as random variables for both linear and planar network deployments. The output SINR (signal-tointerference-plus-noise ratio) and ergodic sum-rate are derived based on the homogenous Poisson point processing (PPP) model. The sum-rate optimization problem in terms of the cluster size is formulated and solved. Simulation results show that the proposed analytical framework can be utilized to accurately evaluate the performance of practical cloud-based small cell networks employing clustered cooperation.
IET Communications, 2016
This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division... more This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division Multiple Access (OFDMA) Heterogeneous Networks (HetNets) consisting of macrocells and femtocells sharing the same frequency band. The focus is to devise optimised policies for femtocells' access to the shared spectrum, in terms of femtocell transmissions, in order to maximise femto users sum data rate while ensuring that certain level of quality of service (QoS) for the macro-cell users in the vicinity of femtocells is provided. The optimal solution to this problem is obtained by employing the well-known Dual Lagrangian method and the optimal femtocell transmit power and resource allocation solution is derived in detail. However, the optimal solution introduces high computational complexity and may not be feasible to apply in real-time systems. To this end, we propose a heuristic solution to the problem. The algorithms to implement both optimal and efficient suboptimal schemes in a practical system are also given in detail while their complexity is compared. Simulation results show that our proposed dynamic resource allocation scheme a) ensures the macro users QoS requirements compared to the Reuse-1 scheme, where femtocells are allowed to transmit at full power and bandwidth; b) can maintain femto user data rates at high levels, compared to the Orthogonal Frequency Reuse scheme, where the network bandwidth resources are partially divided amongst macro and femtocells; and c) provides performance close to the optimal solution, while introducing much lower complexity.
2015 IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks (CAMAD), 2015
This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division... more This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division Multiple Access (OFDMA) Heterogeneous Networks (HetNets) consisting of macrocells and small cells sharing the same frequency band. The focus of this study is to devise an energy efficient scheme that allows shared spectrum access to small cells, while ensuring a certain level of quality of service for the macro cell users. It further enable us to minimize the overall energy consumption by switching the underutilized small cells to sleep mode. To devise such a mechanism, we have used a combination of linear binary integer programming and progressive analysis based heuristic algorithm. We evaluated our proposed solution by comparing the macrocell served users performance against Reuse 1 case. Moreover, we provide an analytical comparison of the network power consumption with and without the sleep mode capabilities. It has been shown that our proposed algorithm not only reduces the overall network energy consumption but also minimizes the interference caused by smalls cells to macrocell served users.
Zenodo (CERN European Organization for Nuclear Research), Nov 30, 2022
This document describes the technical work and solutions of iNGENIOUS on air interface and device... more This document describes the technical work and solutions of iNGENIOUS on air interface and device connectivity for next generation Internet-of-Things (IoT) applications. In short, this deliverable targets at explaining the communication performance evaluation and analysis of IoT technologies and devices, the proposed innovations for efficient air interface and versatile communication applied to heterogeneous IoT networks, the relationship of these technical efforts to the project's architecture and use cases, as well as their exploitation potential.
The 5GCAR project aims to contribute to 5G network design, and specifically to design V2X technol... more The 5GCAR project aims to contribute to 5G network design, and specifically to design V2X technology components for V2X use case classes identified in the project. The requirements on reliability, latency, data rates, spectral and energy efficiency cannot be fully supported by today’s wireless networks and V2X solutions and call for novel and innovative approaches, including the design of a new radio interface.
Zenodo (CERN European Organization for Nuclear Research), Sep 30, 2022
This document provides an overview of the iNGENIOUS cross-layer architecture. The focus is on com... more This document provides an overview of the iNGENIOUS cross-layer architecture. The focus is on component groups within the overall architecture and how their integration and cooperation enable the related iNGENIOUS innovations.
In order to quantify the energy savings in wireless networks, a holistic view of the power consum... more In order to quantify the energy savings in wireless networks, a holistic view of the power consumption of the entire system needs to be captured. This requires an appropriate energy efficiency evaluation framework. In this deliverable, we present the necessary enhancements over existing performance evaluation frameworks for the wireless networks. The main objective is to capture the factors affecting the energy efficiency at component, node and network level. The most important additions to the existing frameworks include: (1) a sophisticated power model for various BS types, that maps the RF output power radiated at the antenna elements to the total supply power necessary to operate the network; (2) an approach to quantify the energy efficiency of large geographical areas by using the existing small scale deployment models along with long term traffic models; (3) a suitable set of metrics that allows quantifying the amount of energy savings capturing the most important trade-offs b...
This deliverable presents the work executed in the first 15 months of the iNGENIOUS<br> pro... more This deliverable presents the work executed in the first 15 months of the iNGENIOUS<br> project with regards to dissemination, communication, standardization, exploitation,<br> and innovation.
IEEE Transactions on Communications, 2012
This document provides an overview of the iNGENIOUS cross-layer architecture. The main purpose of... more This document provides an overview of the iNGENIOUS cross-layer architecture. The main purpose of this deliverable is to reach a common understanding of the project at a technical level among all consortium partners and those supporting the project from outside.
This Data Management Plan describes the management life cycle for the data to be collected, proce... more This Data Management Plan describes the management life cycle for the data to be collected, processed, and generated by the iNGENIOUS project. This document also includes information on the data format, dissemination, and preservation plans in line with the FAIR (Findable, Accessible, Interoperable and Reusable) Data Management Protocols.
This deliverable defines and compile the different scenarios gathered in six use cases that are r... more This deliverable defines and compile the different scenarios gathered in six use cases that are relevant for the project as part of the supply chain ecosystem. For each use case, partners have defined explicit requirements and KPIs (both network and service related) that will be targeted on the development phase.
2020 International Wireless Communications and Mobile Computing (IWCMC)
Vehicle to Everything (V2X) communication has been a topic of great interest for the past decade.... more Vehicle to Everything (V2X) communication has been a topic of great interest for the past decade. Lately, a push from the automotive industry and regulators for inclusion of advanced use cases towards autonomous vehicles, has led to the search for improved solutions that can support the respective features. In this paper, Hybrid Automatic Repeat Request (HARQ) feedback solutions are explored in the context of group communications (groupcast) in cellular V2X. A solution is provided to combine reliability improvements while using the least possible amount of sidelink resources. Furthermore, for the case where members of the group are out of communication range of the transmitter, it is suggested to use the feedback response for selecting another member of the group to forward the message.
With the emergence and continuous growth of wireless data services, the value of wireless network... more With the emergence and continuous growth of wireless data services, the value of wireless networks is not only defined by how many users it can support, but also by its ability to concentrate large amounts of data capacity at localized spots. Information theory provides a mathematical framework which quantifies the maximum achievable data rate over a communication channel. More importantly, information theoretic study for capacity of cellular systems suggests base station cooperation as a mean of overcoming inter-cell interference limitations. The aim of this thesis is to investigate the information theoretic capacity of the cellular uplink. In order to quantify the performance of the current and future engineering solutions, the designers need to know the rate limits that a particular multi-user cellular system can provide and how far from the limit, lays the efficiency of their design. The gap between the information theoretic limit and the performance of currently known systems w...
Cellular V2X for Connected Automated Driving
IEEE Access, 2016
One major advantage of cloud/centralized radio access network (C-RAN) is the ease of implementati... more One major advantage of cloud/centralized radio access network (C-RAN) is the ease of implementation of multicell coordination mechanisms to improve the system spectrum efficiency (SE). Theoretically, large number of cooperative cells lead to a higher SE, however, it may also cause significant delay due to extra channel state information (CSI) feedback and joint processing computational needs at the cloud data center, which is likely to result in performance degradation. In order to investigate the delay impact on the throughput gains, we divide the network into multiple clusters of cooperative small cells and formulate a throughput optimization problem. We model various delay factors and the sum-rate of the network as a function of cluster size, treating it as the main optimization variable. For our analysis, we consider both base stations' as well as users' geometric locations as random variables for both linear and planar network deployments. The output SINR (signal-tointerference-plus-noise ratio) and ergodic sum-rate are derived based on the homogenous Poisson point processing (PPP) model. The sum-rate optimization problem in terms of the cluster size is formulated and solved. Simulation results show that the proposed analytical framework can be utilized to accurately evaluate the performance of practical cloud-based small cell networks employing clustered cooperation.
IET Communications, 2016
This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division... more This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division Multiple Access (OFDMA) Heterogeneous Networks (HetNets) consisting of macrocells and femtocells sharing the same frequency band. The focus is to devise optimised policies for femtocells' access to the shared spectrum, in terms of femtocell transmissions, in order to maximise femto users sum data rate while ensuring that certain level of quality of service (QoS) for the macro-cell users in the vicinity of femtocells is provided. The optimal solution to this problem is obtained by employing the well-known Dual Lagrangian method and the optimal femtocell transmit power and resource allocation solution is derived in detail. However, the optimal solution introduces high computational complexity and may not be feasible to apply in real-time systems. To this end, we propose a heuristic solution to the problem. The algorithms to implement both optimal and efficient suboptimal schemes in a practical system are also given in detail while their complexity is compared. Simulation results show that our proposed dynamic resource allocation scheme a) ensures the macro users QoS requirements compared to the Reuse-1 scheme, where femtocells are allowed to transmit at full power and bandwidth; b) can maintain femto user data rates at high levels, compared to the Orthogonal Frequency Reuse scheme, where the network bandwidth resources are partially divided amongst macro and femtocells; and c) provides performance close to the optimal solution, while introducing much lower complexity.
2015 IEEE 20th International Workshop on Computer Aided Modelling and Design of Communication Links and Networks (CAMAD), 2015
This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division... more This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division Multiple Access (OFDMA) Heterogeneous Networks (HetNets) consisting of macrocells and small cells sharing the same frequency band. The focus of this study is to devise an energy efficient scheme that allows shared spectrum access to small cells, while ensuring a certain level of quality of service for the macro cell users. It further enable us to minimize the overall energy consumption by switching the underutilized small cells to sleep mode. To devise such a mechanism, we have used a combination of linear binary integer programming and progressive analysis based heuristic algorithm. We evaluated our proposed solution by comparing the macrocell served users performance against Reuse 1 case. Moreover, we provide an analytical comparison of the network power consumption with and without the sleep mode capabilities. It has been shown that our proposed algorithm not only reduces the overall network energy consumption but also minimizes the interference caused by smalls cells to macrocell served users.