Opportunistic channel allocation algorithms for WLANs based on IEEE802.11

The deployment of highly dense wireless local area networks (WLAN) can cause an excessive level of interference in the commonly used 2.4 GHz ISM band, which leads to network performance degradation. This paper analyses the possibility to reduce congestion in the crowded ISM band by allowing some access points (APs) to opportunistically operate in a primary band. Although the problem of opportunistic channel allocation considering both ISM and primary bands can be formulated mathematically as a Binary Linear Programming (BLP) problem, existing algorithms (e.g., branch and bound) capable to provide optimal solutions for BLP problems are quite inefficient for large deployments. Therefore, we propose three different heuristic algorithms to solve this opportunistic channel allocation problem by properly extending graph coloring algorithms: First Fit (FF), Saturation Degree Ordering (SDO) and Minimum Spanning Tree (MST). A performance analysis of the three algorithms is carried out under different conditions of primary band availability and AP densityPostprint (published version

Public Safety Mobile Broadband: A Techno-Economic Perspective

Wireless communications are critical to supporting the operational capabilities of public protection and disaster relief (PPDR) organizations. The private/professional mobile radio (PMR) technologies currently used for PPDR communications offer a rich set of voice-centric services [e.g., push-to-talk (PTT) group calls] but have very limited data transmission capabilities and are unable to cope with increasing demands in the PPDR community for mobile data-centric applications. Introducing PPDR mobile broadband communications faces a number of technical and economic/business challenges. It is believed that the current paradigm for PPDR communications provisioning based on dedicated technologies, dedicated networks, and dedicated spectrum no longer constitutes the main approach for introducing PPDR mobile broadband, and hence new paradigms and innovative solutions are needed. Thus, this article first identifies and discusses the main techno-economic drivers across the technology, network, and spectrum dimensions that are anticipated to lay the foundations for future PPDR communications to be efficient and cost-effective. Then, relevant estimations and illustrative figures are provided to add perspective and valuable insight into the economic roots of the envisioned future PPDR mobile broadband communications.JRC.G.7-Digital Citizen Securit

LTE: the technology driver for future public safety communications

Wireless communications technologies play an essential role to support the Public Protection and Disaster Relief (PPDR) operational needs. The current Private/Professional Mobile Radio (PMR) technologies used for PPDR communications offer a rich set of voice-centric services but have very limited data transmission capabilities, which are unable to handle the increasing PPDR community demand for a wider range of data-centric services. Though some efforts have been devoted to upgrade PMR technologies with better data transfer capabilities, the progression towards an enhanced mobile broadband PMR standardized solution still lags behind the achievements made in the commercial wireless industry, which recently culminated in Long-Term Evolution (LTE) technology. Because of this contrasting progress, the adoption of commercial mainstream LTE technology to satisfy the PPDR community’s data communication needs is gaining momentum and offers significant opportunities to create and exploit the synergies between the commercial and PPDR domains, which have remained almost entirely separate to date. In this context, this paper first discusses the suitability of LTE and related technologies for mobile broadband PPDR service provisioning. Next, it presents the argument that the most plausible future scenarios to deliver the increasingly data-intensive applications demanded by the PPDR agencies are expected to rely on the use of both dedicated and commercial LTE-based mobile networks. From this basis, the paper proposes a system architecture solution for PPDR service provisioning that enables PPDR service access through dedicated and commercial networks in a secure and interoperable manner and ensures proper allocation of the networks’ capacity to PPDR applications through the dynamic management of prioritization policies. In addition, the spectrum-related issues that are central to the proposed PPDR service provisioning solution are addressed, and a solution based on the joint exploitation of dedicated and shared spectra is proposed.JRC.G.7-Digital Citizen Securit

On-Demand Network Slicing using SDN/NFVenabled Satellite Ground Segment Systems

none4This paper proposes an architecture framework for the realization of on-demand satellite network slicing that is built on the introduction of Software Defined Networking (SDN) and Network Function Virtualization (NFV) technologies. In this way, service delivery with satellite networks is shifted from a network for connectivity model to a network for service model with a high degree of service customization and adaptability, including satellite bandwidth on-demand. Under this framework, we study the resource orchestration of satellite network services by formulating the on-demand network slicing as an optimization problem that provides flexible service chaining and provisioning taking into account diversified service requirements. The objective is to determine the optimal resource allocation for supporting a satellite network slice that minimizes resources consumption while meeting service specification requirements such as the end-to-end delay.noneToufik Ahmed; Abdelhamid Alleg; Ramon Ferrus; Roberto RiggioAhmed, Toufik; Alleg, Abdelhamid; Ferrus, Ramon; Riggio, Robert

Public Safety Communications: Enhancement Through Cognitive Radio and Spectrum Sharing Principles

Wireless communications technologies play an irreplaceable role in emergency and disaster relief situations. It is generally acknowledged that existing Public Safety (PS) wireless communications facilities frequently fall short of meeting users’ needs in many critical situations. Emergency scenarios usually lead to exceptionally high traffic loads and the lack of network capacity is one of the major limitations to overcome. In this context, this work firstly discusses on the several dimensions enabling increased capacity in emergency scenarios and, after that, the attention is placed on the role of spectrum sharing as one of these key dimensions. In this regard, a comprehensive view of possible spectrum sharing models for emergency communications is developed. The key principles underlying each sharing model are given and its applicability described through illustrative examples, where it is made evident that Cognitive Radio (CR) technology constitutes a major technological enabler for their realisation. Finally, a discussion on the feasibility of each of the spectrum sharing models is addressed.JRC.G.6-Security technology assessmen

LTE: the technology driver for future public safety communications

Abstract: Wireless communications technologies play an essential role to support the Public Protection and Disaster Relief (PPDR) operational needs. The current Private/Professional Mobile Radio (PMR) technologies used for PPDR communications offer a rich set of voice-centric services but have very limited data transmission capabilities, which are unable to handle the increasing PPDR community demand for a wider range of data-centric services. Though some efforts have been devoted to upgrade PMR technologies with better data transfer capabilities, the progression towards an enhanced mobile broadband PMR standardized solution still lags behind the achievements made in the commercial wireless industry, which recently culminated in Long- Term Evolution (LTE) technology. Because of this contrasting progress, the adoption of commercial mainstream LTE technology to satisfy the PPDR community's data communication needs is gaining momentum and offers significant opportunities to create and exploit the synergies between the commercial and PPDR domains, which have remained almost entirely separate to date. In this context, this paper first discusses the suitability of LTE and related technologies for mobile broadband PPDR service provisioning. Next, it presents the argument that the most plausible future scenarios to deliver the increasingly data-intensive applications demanded by the PPDR agencies are expected to rely on the use of both dedicated and commercial LTE-based mobile networks. From this basis, the paper proposes a system architecture solution for PPDR service provisioning that enables PPDR service access through dedicated and commercial networks in a secure and interoperable manner and ensures proper allocation of the networks' capacity to PPDR applications through the dynamic management of prioritization policies. In addition, the spectrumrelated issues that are central to the proposed PPDR service provisioning solution are addressed, and a solution based on the joint exploitation of dedicated and shared spectra is proposed