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Recent research on Low Power Wide Area Network (LPWAN) technologies which provide the capability of serving massive low power devices simultaneously has been very attractive. The LoRaWAN standard is one of the most successful developments. Commercial pilots are seen in many countries around the world. However, the feasibility of large scale deployments, for example, for smart city applications need...
In this paper, we analyze the outage probability of multiple-input multiple-output cognitive cooperative radio networks (CCRNs) with multiple opportunistic amplify-and-forward relays. The CCRN applies underlay spectrum access accounting for the interference power constraint of a primary network and utilizes orthogonal space-time block coding to transmit multiple data streams across a number of antennas...
In recent years, dramatic growth of mobile data traffic has left the operators no choice but to consider Wi-Fi networks as an economic complementary solution. To achieve this, WLANs require to adopt some of the key features of carrier-grade operators, such as centralized resource management. As an emerging paradigm, Software Defined Networking (SDN) can be used to provide salient centralized network...
The aggregation of multiple carriers and even heterogeneous links is a well established method to boost data rates in wireless networks. At the same time, Network Coding has been proven as an efficient and robust mechanism to distribute content in mesh networks or cloud storages. In this paper, we introduce with ScalaNC a new method of heterogeneous link aggregation, which requires no changes in the...
Context-aware systems for smart environments can be very complex and demanding for developers especially in distributed computing and communication environments. We propose a new development infrastructure, that targets this challenge by improving the general system's scalability and traceability. The infrastructure has been developed for and tested in two research labs for smart environments and...
Teledermatology offers the possibility of improving access to dermatologic care by using telecommunication technologies for connecting several medical centers and enabling to exchange information about skin conditions over a distance. This paper describes the main points of the implementation of a teledermatology project following the so-called smart region paradigm. A case study is presented to describe...
This paper considers the problem of joining a network of constrained IoT devices. We propose to take advantage of Singer Cyclic Difference Sets (S-CDS) for a joining scheme that results in low duty cycles and apply the proposed scheme to the joining problem in 802.15.4e TSCH networks. S-CDS distributes the active periods of nodes over time so that a joining node does not suffer from long scanning...
Reliable service provisioning is crucial to the public safety (PS) communications especially when network outage happens. Isolated E-UTRAN operation, introduced in LTE Release 13, is able to host separate core network functions at the base stations (BSs) to provide limited set of services to the users. However, a significant issue remains to be solved is to coordinate among BSs to create an autonomous...
The Internet of Things (IoT), describing the Machine Type Communications (MTC), is in the center of many new technical studies and industrial projects. It is also a central topic for the future 5G technologies standardization. Pending the new generation of cellular networks, the 3rd Generation Partnership Project (3GPP) has already standardized in May 2016, an evolution of the 2G and 4G networks to...
Application-Level Forward Erasure Correction (AL-FEC) codes have become a key component of communication systems in order to recover from packet losses. This work analyzes the benefits of the AL-FEC codes based on a sliding encoding window (A.K.A. convolutional codes) for the reliable broadcast of real-time flows to a potentially large number of receivers over a constant bit rate channel. It first...
New Long-Range radio technologies have recently emerged in the IoT landscape. These technologies work in the Sub-GHz bands, allowing low-power communications over long distances. They are typically based on star-topology networks, where nodes send the data directly to a base station connected to the Internet. One of such technologies is LoRa. Enabled LoRa-based multihop communications would open up...
In this paper, we consider a two-tier cellular network consisting of a primary macro cell base station (PMBS) which is overlaid by cognitive small cell base stations (CSBSs) to achieve efficient spectrum utilization. The deployment of two-tier cellular networks can provide higher capacity for the system but also causes cross-tier, intra-tier, and inter-tier interference within the cellular networks...
We examine possibilities for transmit power reduction both from the relay station (R) and the base station (S − Source) on downlink in dual-hop OFDM decode-and-forward (DF) relay system. Two solutions, known for capacity enhancement in OFDM based relay systems, are applied for improving energy efficiency, while keeping end-user capacity on the same level. In the first analyzed solution, it is assumed...
Internet-of-Things (IoT) is no longer just a research hype, but rather a reality in which ICT plays a fundamental role. Programming the behavior of Smart Environments not only enables designers to create innovative interactive experiences for intelligent spaces, but also empowers their inhabitants to tailor the intelligent facilities according to their preferences. To that end, this paper presents...
The route recovery algorithm is a crucial part of an ad hoc routing protocol. Designing an efficient and fast route recovery mechanism scheme without incurring extra overheads or delays to repair the broken link is a desirable goal for any routing protocol. The route recovery algorithm in reactive routing protocols like AODV occurs only after a link failure is detected. However, we propose a new route...
The article presents an analysis of correlation-based clustering procedure in cooperative spectrum sensing. The motivation is to assess if it is more beneficial in terms of energy efficiency to group nodes according to the received signal-to-noise ratio (SNR) on the link between Primary User and node or according to the distance between nodes. To this end, a merged clustering measure is introduced...
Air pollution is an important issue due to its direct impact on human health. To cope with this problem, in urban areas a “monitor and react” approach, based on measurements provided use of static monitoring stations, is commonly adopted introducing constrains to the amount of areas that can be monitored within the city. With the rise of the Internet of Things paradigm, new air monitoring models based...
Cancer related fatigue is a chronic disease that may persist up to 10 years after treatment of cancer has been finished successfully and is one of the most prevalent problems of cancer survivors. Cancer related fatigue is a complex symptom that is not sufficiently understood and difficult to remedy. Patients do not necessarily follow a treatment plan with regular in-office follow-ups. As a consequence,...
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