Andreas Georgakopoulos's research while affiliated with Wings ICT Solutions and other places

Publications (61)

Article
In 5G wireless networks, different types of services will be handled, including critical communications such as ultrareliable, low-latency communications (URLLC) and high-bit-rate communications [e.g. enhanced mobile broadband (eMBB) traffic]. To effectively handle such different types with diverse requirements, operators are working on network sli...
Chapter
5G networks would be a heterogeneous networks (HetNets), meaning that different networks will be integrated all together to a unified system, enabling aggregation of multiple existing radio access technologies (RATs) such as LTE‐A, Wi‐Fi, D2D, and even lightly licensed. 5G will be designed to be a viable, robust, and scalable technology. Another po...
Article
A hierarchical radio resource management scheme using small and macrocells would allow cellular users to reuse and exploit potentially underutilized spectrum portions. To overcome the issue of limited resources that can be allocated to users, one can exploit the spectrum access system (SAS), a technology that enables better allocation of the availa...
Chapter
This chapter provides information on major performance evaluation frameworks that were developed for legacy and 5th generation (5G) systems. It presents performance assessments for some of the representative 5G use cases. The chapter focuses on network energy efficiency, that is, the capability of the network to operate with certain (preferably low...
Article
Full-text available
This deliverable contains a detailed description of the use cases considered in SPEED-5G, which will be used as a basis for demonstration in project. These use cases are Dynamic Channel selection, Load balancing, carrier aggregation. This deliverable also explains the SPEED-5G architecture design principles, which is based on software-defined netwo...
Article
Research and development of technologies that address the challenges of predicted growth in mobile connections and traffic volume is well known. A major challenge is the cost of meeting the objective, in terms of both infrastructure and deployment. Today, lack of dynamic control across wireless network resources is leading to unbalanced spectrum lo...
Article
Full-text available
Heterogeneous networks constitute a promising solution to the emerging challenges of 5G networks. According to the specific network architecture, a macro-cell base station (MBS) shares the same spectral resources with a number of small cell base stations (SBSs), resulting in increased co-channel interference (CCI). The efficient management of CCI h...
Article
Full-text available
The stringent requirements defined for 5G systems drive the need to promote new paradigms to the existing cellular networks. Dense and ultra-dense networks based on small cells, together with new spectrum sharing schemes seem to be key enabling technologies for emerging 5G mobile networks. This article explores the vision of the SPEED-5G project, a...
Article
5G systems are expected to advance on a number of aspects compared with current systems, for example, providing a 1000 times higher capacity, a much lower latency and improved quality of user experience. This paper presents the vision and approach followed by the H2020 project SPEED-5G. The approach is based on densification of small cells, exploit...
Conference Paper
The stringent requirements defined for 5G systems drive the need to promote new paradigms to the existing cellular networks. Dense and ultra-dense networks based on small cells, together with new spectrum sharing schemes seem to be key enabling technologies for emerging 5G mobile networks. This article explores the vision of the SPEED-5G project, a...
Conference Paper
This paper presents the vision and some early results achieved by the EU-funded SPEED-5G project which is part of 5G PPP. It addresses some key challenges of future 5G systems, i.e. a 1000 times higher capacity, a much lower latency and a much improved user quality of experience compared to currently deployed networks. The devised new technologies...
Article
Full-text available
5th generation mobile networks will have to cope with a high degree of heterogeneity in terms of services, mobility, number of devices and so on. Thus, diverse and often contradicting key performance indicators need to be supported, but having multiple radio access technologies for multi-service support below 6 GHz will be too costly. FANTASTIC-5G...
Article
Wireless networks have made huge progress over the past three decades. Nevertheless, emerging fifth-generation (5G) networks are under pressure to continue in this direction at an even more rapid pace, at least for the next ten to 20 years. This pressure is exercised by rigid requirements as well as emerging technology trends that are aimed at intr...
Article
Today there are forceful work streams that aim at realizing the fifth generation of wireless/mobile broadband (5G WMB). The work is driven by a framework that consists of three main requirements and two main sets of technology trends. This article presents the framework with the aim of contributing to the solidification of the technological foundat...
Chapter
This chapter presents a bio-inspired machine-learning approach that will be applied to the moving cognitive access points (MCAPs) problem. The MCAPs concept is considered as a solution for the reliable handling of demanding situations. MCAPs are efficient means for offering telecommunication networking services with reduced capital expenditure (CAP...
Conference Paper
Intelligent Knowledge as a Service (iKaaS) is an ambitious project aiming at integrating sensor management using Internet of Things (IoT) and cloud services by exploiting sensor data. The platform design covers self-healing function based on self-awareness as well as basic functions such as inter-cloud, security/privacy management, and devices and...
Conference Paper
The success of the IoT world requires service provision attributed with ubiquity, reliability, high-performance, efficiency, scalability. In order to accomplish this attribution it is possible to merge the Cloud Computing and IoT concepts by combining global and local clouds, security gateways, communication interfaces, storage units and applicatio...
Chapter
In order to sustain and ultimately succeed in the Future Internet (FI) era, wireless/mobile broadband networks will have to jointly satisfy complex context of operations as well as system requirements like QoE (Quality of Experience), energy and cost efficiency. Introduction of intelligence in the Cloud-RANs will lead towards this direction by prov...
Article
Next-generation [fifth-generation (5G)] mobile systems are broadening their spectrum to higher-frequency bands (above 6 GHz) to support a high data rate up to multigigabits per second. In this article, we have two main contributions to higher-frequency communications. First, we summarize the candidate frequency bands that are promising for 5G resea...
Article
This article considers the concept of device-to- device communications for the resolution of persistent issues in mobile networks. Specifically, two scenarios are described, the opportunistic coverage expansion of the infrastructure, where an access point transits to offline mode (and hence its terminals shall exploit the presence of neighboring de...
Chapter
The emerging wireless world is expected to be characterized from the demand for new, diversified applications/services, the expanded use of wireless and the need for increased efficiency in resource provisioning and utilization. Therefore, the resource usage in an opportunistic manner would provide a solution towards this direction. Opportunistic n...
Article
This paper proposes the data structures needed for the cognitive management of operator-governed opportunistic networks (ONs), which are coordinated extensions of the infrastructure and are created dynamically and temporarily through operator policies when they are needed. The data structures are divided in five categories: profiles, context, decis...
Article
Toward the fifth generation (5G) of wireless/mobile broadband, numerous devices and networks will be interconnected and traffic demand will constantly rise. Heterogeneity will also be a feature that is expected to characterize the emerging wireless world, as mixed usage of cells of diverse sizes and access points with different characteristics and...
Article
Self‐organizing networks (SONs) have been introduced into long‐term evolution in order to configure and optimize the network in an autonomic manner. However, in some situations the reconfiguration of the entire network is not the most cost‐efficient solution. Consequently, opportunistic networks have been introduced as operator‐governed, coordinate...
Conference Paper
This paper considers a coverage and capacity optimization problem in heterogeneous networks (HetNets), where small cells are deployed within the area of a macro base station. The small cells are configured to the optimal power level in order to maximize the users?? throughput without causing interference to the other users and simultaneously taking...
Conference Paper
Self-Organizing Networks (SONs) have been introduced in LTE in order to configure and optimize the network in an autonomic manner. However, in some situations the reconfiguration of the entire network is not the most cost-efficient solution. Consequently, Opportunistic Networks have been introduced as operator governed, coordinated extensions of th...
Article
Full-text available
As the Internet has penetrated everyday life, more and more users will demand high-quality services. However, the Internet was not designed to handle such heavy usage. Thus, networks need to be enhanced in order to deal with the increased traffic. In this study, the use of opportunistic networks (ONs) is studied. ONs are operator-governed, coordina...
Article
This work provided an overview of the cognitive networks and systems for a wireless FI by considering the current status and looking forward at the emerging challenges. Emphasis was placed on the opportunistic networking paradigm to provide an insight on research regarding operator-governed ONs that are assumed to be coordinated extension of the in...
Conference Paper
Information and knowledge sharing mechanisms are essential for the efficient operation of cognitive wireless communication systems, complementing learning and decision making and enabling the coordination between various management entities. Information and knowledge sharing mechanisms can be defined as means for transmitting elements of informatio...
Article
The emerging wireless world should encompass the use of cost-efficient networking paradigms in order to provide extra resources to an operator’s infrastructure for the provision of services. Opportunistic networks (ONs) are a promising solution towards this direction. The proposed approach assumes that ONs are operator-governed, coordinated extensi...
Conference Paper
Unequivocally, one of the main challenges of the arising wireless world is to support the QoS-demanding services. However, the solutions that will be considered should not only take into account the optimization of the network performance, but should also be energy efficient both for the operator and the end-user. This paper presents the concept of...
Article
It is expected that the wireless world will migrate towards an era that will comprise more local/ temporary structures for the provision of services. A networking paradigm towards this direction is the opportunistic networking. Operator-governed ONs are dynamically created, temporary, coordinated extensions of the infrastructure. Operator governanc...
Article
Full-text available
One of the main challenges of the arising wireless world is to support a wide set of QoS-demanding services. However, the solutions that will be considered should not only take into consideration the optimization of the network performance, but should also be energy efficient both for the op-erator and the end-user. This paper presents the concept...
Conference Paper
The emerging wireless world will migrate towards an era that will comprise more local/ temporary structures for the provision of services. Opportunistic networking would be used as a networking paradigm towards this direction. Specifically, operator-governed opportunistic networks (ONs) are dynamically created, temporary, coordinated extensions of...
Conference Paper
The exponential increase in the requests of demanding services has lead current networks to their limits. As a result there is need to handle the increased traffic. This work focuses on the solution of Opportunistic Networks (ONs) which are operator-governed, coordinated extensions of the infrastructure. More specifically a macro base station (BS)...
Conference Paper
It is expected that the wireless world will migrate towards an era that will comprise more local/temporary structures which, for instance, can be called Opportunistic Networks (ONs). Operator-governed ONs are dynamically created, temporary, coordinated extensions of the infrastructure. This paper presents an approach for exploiting such ONs in orde...
Conference Paper
Our work showcases how opportunistic networks can be used for expanding the coverage and the capacity of infrastructures in a Future Internet context. Opportunistic networks are managed by cognitive systems, which collaborate through control mechanisms. The demonstration of these technologies shows enhanced service provision capabilities, higher re...
Article
Operator-governed opportunistic networks (ONs), which are dynamically created, temporary coordinated extensions of the infrastructure, are the first ingredient for the proposed networking solution. This article presents the concept of cognitive management systems (CMSs) for the management of ONs, their coordination with the infrastructure, and eval...
Conference Paper
In the future internet era, mechanisms for extending the coverage of the wireless access infrastructure and service provisioning to locations that cannot be served otherwise or for engineering traffic whenever the infrastructure network is already congested will be required. Opportunistic networks are a promising solution towards this direction. Op...
Conference Paper
In the Future Internet era, it will be required to provide coordinated extensions of the infrastructure as a potential solution to matters such as coverage and capacity extension, infrastructure supported opportunistic ad-hoc networking and traffic aggregation in the access and backhaul network. Opportunistic networks are a solution to that directi...
Article
Opportunistic Networks are temporary, localized, operator-governed network segments that are created under certain circumstances. Opportunistic Networks can be used as coordinated extensions of the infrastructure in order to provide solution to matters such as coverage and capacity extension, infrastructure supported opportunistic ad-hoc networking...
Article
It is assumed that opportunistic networks are ad hoc, operator-governed, temporary, coordinated extensions of the infrastructure and have the ability to accommodate new FI-enabled applications. As a result, during the creation phase of an opportunistic network, the nodes that will constitute the network need to be selected and assigned with the pro...
Conference Paper
The dawn of the Future Internet (FI) era poses new requirements to modern communication networks namely, the demand for new applications/ services, the support for diversified services, the expanded use of wireless access and the need for increased efficiency in resource provisioning and utilization. In this paper we propose a solution to address t...
Article
The emerging cognitive wireless world considers new networking paradigms that have already started to intrigue the scientific community. In accordance to this, ETSI has proposed the Cognitive Control Network (CCN), which is based on an infrastructure-free network formation and it is an extension of the infrastructure-based Cognitive Wireless Networ...
Article
Full-text available
This work proposes a cognitive management framework for realizing and exploiting the Internet of Things concept in the Future Internet (FI) era. Cognitive systems offer self-x and learning. A cognitive system has the ability to dynamically select its behavior through self-management/awareness functionality, taking into account information and knowl...
Article
Full-text available
Opportunistic networks (ONs) are considered as coordi-nated extensions of a radio access network infrastructure, which are dynamically and temporarily created in an infra-structure-less manner in order to increase service reachabil-ity, improve resource utilization efficiency and facilitate lo-calised service provisioning. The realization of the ON...

Citations

... An extended version presented in [8] by the same authors investigated SAS-assisted dynamic channel allocation for PAL and GAA users by introducing node-channel-pair conflict graphs to capture channel constraints, coexistence awareness, pairwise channel interference and spatially varying channel availability. Authors in [27] consider different user categories based on minimum acceptable throughput in which the proposed algorithm achieves the minimum requirements allocated to each category by assigning the resource blocks among all stakeholders.The objective in this paper was achieved by evaluating traffic requirements by calculating the shadowing effects and transmission path-loss. The dedicated field trials and hardware experiments to implement and evaluate CBRS-SAS architecture were discussed in [28,29]. ...
... For example, out of the analysis that has been carried out for mMIMO, findings suggest that the number of antennas needs to be kept relatively low (e.g. 16T16R or 32T32R) to ensure the TCO of the technology deployment remains viable, otherwise the operational expenditure from energy consumption can increase to levels that are not economically viable [149], [187]. Such findings have also been identified elsewhere in the technoeconomic literature with higher and higher order MIMO leading to an unsustainable level of energy demand (which can also have negative environmental impacts should this energy be coming from environmentally unfriendly fossil fuels) [185]. ...
... 5G design is required to give organize answers for a wide scope of private and public sectors like energy, city management, producing, farming, transport and medicinal services with progress in software services [2,8]. 5G networks handle several numbers of connections, apart from this it also supports diverse nature of devices with their service requirements. ...
... In 5G, to provide better services and reduce capital expenditures and operating expenses, cloud radio access network (C-RAN) with the characteristics of centralized processing, collaborative wireless, real-time cloud computing and energy-saving infrastructure has attracted widespread attention. Meanwhile, to improve network coverage and link capacity to cope with explosive data traffic growth, heterogeneous network (HetNet) architecture with different types of cells has been proposed as a promising technology [55]. Long term evolution-advanced (LTE-A) band below 6 GHz is too crowded for 5G. ...
... Also, mechanisms for better scheduling or transmission power control schemes will help in a power reduction combined with algorithms that enable the base station to get into the sleep mode more effectively, thus saving energy. Also, SPEED-5G is proposing the novel idea of D2D using LAA/LTE-U, novel channel selection scheme [18]- [19] and small-cell-based load balancing via LAA/LTE-U type mechanism. ...
... One of the first projects is SPEED-5G [109], which is among the projects under the 5G PPP-Phase 1 [108] that focused on the autonomous RRM and self-optimization of spectrum utilization in heterogeneous small cells based networks. The H2020 SELFNET [110] and COGNET [111], as well as FP7 SEMAFOUR [112], are projects that were devoted to self-organized network management. ...
... Each scheduler is univocally associated to one or more 5G-RLC logical channels, though one logical channel is not shared between schedulers.The different scheduler entities are embedded in a common 5G-MAC structure that can access the different cell resources on demand, implementing as well a single data forwarding, signaling and configuration point towards upper and lower layers. This layer also provides common functions needed in order to support dynamic access operation on licensed, lightlylicensed and unlicensed frequency bands[12], that are shared among different RATs. Due to the high flexibility of the propose interface, different radio technologies with different configurations can coexist within the same cell, enabling the support of multiple service types (e.g. ...
... Firstly, dynamicity of channel availability, in which the operating channels, particularly the licensed channels, can be randomly occupied by licensed users (or primary users, PUs); consequently, unlicensed users (or secondary users, SUs) must search for and use the licensed channels in an opportunistic manner [1][2][3][4][5]. Secondly, heterogeneity, in which the network consists of different types of network cells (e.g., macrocells and small cells) and different types of nodes (e.g., using different operating channels and transmission power levels); consequently, nodes must adapt to a diversified operating environment [6][7][8][9][10]. Thirdly, ultra-densification, in which there are a large number of base stations (BSs), particularly small cells, and nodes in an area; consequently, nodes must search within nodes and BSs to find a route with the least traffic intensity in order to maximize traffic offloading [7,[11][12][13]. ...
... This particularly relates to earthquakes (topic 20), a thematic focus absent in Sweden's network. Several studies in the Japanese network (Fujiwara et al. 2015; DeWit 2018; see Barrett et al. 2021) emphasise that the Great East Japan Earthquake of 2011 was a major contextual trigger for the intense interest with energy optimisation and resilience in Japanese smart cities. Following the nationwide idling of baseload nuclear power in reaction to the explosion at the Fukushima Daiichi Nuclear Power Plant, the eastern part of Japan (particularly the Tokyo Metropolitan area) experienced rolling blackouts and government requests to industry to cut down electricity use, since 31% of electricity in Japan was supplied by nuclear power plants at the time (see Hayashi and Hughes 2013). ...