Panagiotis Demestichas

Panagiotis Demestichas
University of Piraeus · Department of Digital Systems

Professor

About

353
Publications
45,633
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,341
Citations
Additional affiliations
September 2002 - present
University of Piraeus
Position
  • Professor

Publications

Publications (353)
Article
Full-text available
While 5G is being deployed and the economy and society begin to reap the associated benefits, the research and development community starts to focus on the next, 6th Generation (6G) of wireless communications. Although there are papers available in the literature on visions, requirements and technical enablers for 6G from various academic perspecti...
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...
Conference Paper
Full-text available
Farming has been changing through multiple technological transformations in recent years, in parallel with the earth’s growing population and demands. The Internet of Things (IoT) provides very remarkable technological innovations on farming by bringing a new paradigm. Aquaculture in fresh or salt water is a rapidly growing food sector to produce a...
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
Full-text available
5G networks will have to offer extremely high volumes of content, compared to today’s. Moreover, they will have to support heterogeneous traffics, including Machine-to-machine, generated by a massive volume of Internet-of-Things devices. Traffic demands will be variable in time and space. In this work, we argue that all this can be achieved in a co...
Conference Paper
Full-text available
The focus of 5G on vertical applications has brought about a great attention on Crowded Events (CE). This paper presents a novel framework specifically designed for CEs, which combines the contributions of two 5G Application Providers, namely Italtel (a Large Enterprise) and Incelligent (an SME, pursuing its entrance at the scale-up phase). In a ch...
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...
Article
Full-text available
The fifth generation of cellular communication systems is foreseen to enable a multitude of new applications and use cases with very different requirements. A new 5G multiservice air interface needs to enhance broadband performance as well as provide new levels of reliability, latency and supported number of users. In this paper we focus on the mas...
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...
Chapter
In the future internet era, the Internet of Things (IoT) has consolidated its presence in the smart cities with a variety of innovative IoT platforms for the provisioning of relevant services. The provisioning of such services requires ubiquity, reliability, high-performance, efficiency, scalability. In order to accomplish this popular trend is to...
Article
Full-text available
This Special Issue originates from the international conference EuCNC2016, which was held in June 2016 in Athens, Greece. Initially, it publishes some key contributions presented at the conference describing different aspects in the most recent 5G (5th generation) activities in the areas of Air Interfaces and Management Technologies. The series con...
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
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
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
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
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...
Article
Full-text available
SON technologies have been a promising approach for simplified and automated RAN management. Currently, SON functions can be D-SON among the network elements or C-SON as part of the OSS/NMS. D-SON technology is typically provided by equipment vendors, while C-SON is provided by both third parties and equipment vendors. D-SON has high reactivity but...
Conference Paper
Traffic engineering (TE) is dealing with the issue of performance evaluation and optimization of networks. TE mechanisms have been widely exploited in the past and current networks, however their corresponding TE solutions are unfavorable for the next generation networking paradigms. To overcome the ever-increasing size and complexity of network ma...
Article
The amount of traffic that is generated by users and high-demanding services is expected to rise dramatically in the forthcoming years. This will unavoidably deteriorate the performance and increase the consumed energy of core networks, thus constraining the growth of Internet. To this effect, multilayer traffic engineering schemes in IP/multiproto...
Article
The increased complexity of emerging and future networks and services requires the use of sophisticated but simplified management and control that will minimize the burden of human presence and manual operation. Autonomic network management (ANM), on the one hand, and softwaredefined networking (SDN), on the other hand, have appeared with the promi...
Technical Report
Full-text available
This deliverable reports the final feasibility evaluation results of the solutions for the autonomous cognitive radio functionalities developed in WP4. A description of the tools (simulation or analytical models) that have been used to evaluate the feasibility of each solution is presented. Furthermore, results of empirical feasibility tests, obtai...
Article
Global Internet traffic has increased tremendously and this trend is anticipated to continue for the next years. Consequently, network's performance and users' satisfaction cannot be guaranteed. The necessity for adequate bandwidth to carry this increased traffic has led to the addition of resources to the current core network and service infrastru...
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...
Conference Paper
This paper presents the study of the relationship between Autonomic Network Management (ANM) and Software-Defined Networking (SDN) under the prism of Long Term Evolution (LTE) Self-Organizing Networks (SONs). The ANM and SDN paradigms, besides sharing a few common goals, have shown to be complementary to each other in terms of level of abstractions...
Article
Full-text available
In this paper we present cognitive mechanisms (applied and validated at various levels of the protocol stack) for supporting smart applications and services towards users. More specifically, we introduce the results of a pilot test that took place as an application of web-based learning systems. The instance used was the example of linguistics and...
Article
Full-text available
Cities have an ever increasing wealth of sensing capabilities, recently including also internet of things (IoT) systems. However, to fully exploit such sensing capabilities with the aim of offering effective city-sensing-driven applications still presents certain obstacles. Indeed, at present, the main limitation in this respect consists of the vas...
Conference Paper
This work presents a cognitive framework and associated platform for smART Energy Management of wIreless technologieS and mobile applications (ARTEMIS), targeting the reduction of the energy consumption that derives from wireless technologies and applications, by considering a huge set of different aspects and actors, i.e. starting from the infrast...
Article
The success of mobile networks has been driven by the services offered, i.e. voice in second generation and multimedia services in third generation networks. Similarly, a key issue for the success of future generation networks is considered to be the provision of enhanced, always available, personalised services. At the same time, the complexity an...
Article
The pervasiveness of computers in everyday life has already increased and keeps increasing the available digital data both in volume and variety/disparity. This large and dynamic availability of digital data is referred to as Big Data and is very promising in bringing forward new insights and knowledge. For obtaining these insights, the proper comb...
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
Telecommunications networks have evolved towards a unified, service-oriented, operator-governed and autonomic managed infrastructure. Unification ensures interoperability and federation among different domains, technologies, architectures, while allowing the joint consideration of network and service aspects towards a “network as a service” view. A...
Article
The handling of the number of objects that will be part of the Internet of Things (IoT) and the various networking technologies used for their interconnection requires suitable architecture and technological foundations. Despite significant work on architectures and test facilities for the IoT, there is still a lack of management functionality to o...
Conference Paper
Large availability of digital data, or else Big Data, offers to data scientists the chance of exploiting them and building knowledge on different aspects of everyday life related to e.g., people preferences and habits, transportation, health systems, telecommunications etc. This study targets to exploit this opportunity in the telecommunications er...
Article
SUMMARY Academic and industrial research initiatives have sought to make fully autonomic networks a reality. Some of these initiatives pursued a holistic approach, while others focused on setting up functionalities for specific networking domains. These efforts did not succeed in being extensively deployed, because the goals of network operators we...
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
The wireless world is migrating towards an era that will comprise wireless network infrastructure, as well as more temporary structures which, for instance, can be called Opportunistic Networks (ONs). ONs can comprise various terminals, potentially organized in an ad-hoc mode, and be terminated at a set of access points of the infrastructure-based...
Conference Paper
Full-text available
This paper addresses the issue of virtual network service provision, i.e. establishment of virtualized connectivity services over heterogeneous network infrastructures and argues that, besides the enabling transport and switching technologies, effective planning methods must also be studied so that such services can be provided on-demand, within re...
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...
Article
Full-text available
The Internet of Things (IoT) is expected to substantially support sustainable development of future smart cities. This article identifies the main issues that may prevent IoT from playing this crucial role, such as the heterogeneity among connected objects and the unreliable nature of associated services. To solve these issues, a cognitive manageme...
Conference Paper
The adoption of autonomic features in network management becomes a necessity to cope with the increasing complexity of the telecommunications ecosystem. The purpose of this paper is to present the concept of Unified Management Framework (UMF) developed in the FP7 UniverSelf project. The core of UMF comprises three functional blocks, namely Governan...
Conference Paper
Full-text available
This work presents a Cognitive Management framework for empowering the Internet of Things (IoT). This framework has the ability to dynamically adapt its behaviour, through self-management functionality, taking into account information and knowledge (obtained through machine learning) on the situation (e.g., internal status and status of environment...
Book
Full-text available
The Internet constitutes the most vital scientific, technical, economic and societal set of infrastructures in existence and in operation today, serving 2.5 billion users. Continuing its development will secure future innovation and prosperity and underpin the sustainable economic growth needed in the future. Future Internet infrastructure research...
Book
Full-text available
The book is available on-line @ http://link.springer.com/book/10.1007%2F978-3-642-38082-2
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...
Conference Paper
Cognitive radio networks operation relies on the capability to gather information about the surrounding environment, as regards both internal network status (presence and capabilities of other devices belonging to the same network) and external systems potentially coexisting with the cognitive network. In particular, retrieving information at the l...
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...