The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
When the Global Positioning System is unavailable, cellular networks become the dominant vehicle for positioning. However, no tractable approach exists for gaining general insights into localization performance in such networks. Instead, analysis is often done using deterministic network models or with complex system-level simulations, resulting in highly context-specific insights, which do not translate...
In this paper we address the diffusion of useful information in generalized networks each consisting of a wireless physical substrate and a social network overlay. Contrary to previous works, we consider the effect of user interest and features thereof on the spreading dynamics of useful information within these complex wireless-social networks, e.g., how interest periodicity affects the diffusion...
Wi-Fi was originally designed to provide broadband wireless Internet access for devices which generate rather heavy streams. And Wi-Fi succeeded. The coming revolution of the Internet of Things with myriads of autonomous devices and machine type communications (MTC) traffic raises a question: can the Wi-Fi success story be repeated in the area of MTC? Started in 2010, IEEE 802.11 Task Group ah (TGah)...
To support the unrelenting demand of services with gigabit data rates in indoor scenarios, a dense heterogeneous small cell network (HSCN) is presented as a promising paradigm for the fifth generation system. In this paper, the coverage probability for the downlink HSCN with three cell association methods, namely the nearest association, the N-th nearest association and the maximum received power...
This paper proposes a new analytical model for the performance of a p persistent slotted Aloha medium access protocol in a Cognitive Radio Network (CRN) composed by a single Primary user (PU) and several Secondary users (SUs) with Poisson traffic. SUs run a synchronized sensing-access operation cycle, and when they have a packet to transmit and the channel is sensed free, they access to the data slots...
Self-Organizing TDMA (S-TDMA) is a channel access technique based on a time-slotted channel and distributed slot reservation procedure. It is considered as a valid alternative to the Dedicated Short Range Communication (DSRC) standard for safety-critical (V2X) communications, because of its stable deterministic access opportunity and delay under various channel loads. This paper provides an analytical...
Load balancing through proactive offloading users onto small cells is critical for tapping the potential of dense heterogeneous cellular networks (HCNs). However, the impact of such offloading on the uplink performance is not well understood, primarily due to the lack of tractable models. Uplink power control and spatial interference correlation further complicate the mathematical analysis as compared...
Handover decisions and mobility management in modern communication networks are carried out using signal measurements taken at user equipment (UE), obtained from neighboring base stations. Therefore, time and frequency selective characteristics of the radio propagation channel can seriously degrade the handover performance. In this paper, we investigate the impact of channel fading on the handover...
In this paper we propose a novel Bayesian network based model for analysing convergence properties of reinforcement learning (RL) based dynamic spectrum access (DSA) algorithms. It uses a minimum complexity DSA problem for probabilistic analysis of the joint policy transitions of RL algorithms. A Monte Carlo simulation of a distributed Q-learning DSA algorithm shows that the proposed approach exhibits...
Directional transmission and reception using multiple-input multiple-output (MIMO) technologies allows spatial multiplexing in a wireless network. However, multipath propagations in radio channels usually result in the angular spread of signal power, which causes interference among the sectors. Moreover, the random movement of the nodes leads to the variation of the interference. An accurate and mathematically...
We present a performance evaluation of ITLinQ and FlashLinQ, the two most popular schemes proposed to date to channelize D2D transmissions, i.e., to parse transmissions into noninterfering sets to be allocated to separate channels. Recognizing that it captures well the spatial characteristics of D2D networks, a stochastic geometry setting is utilized for this evaluation with the parameters of either...
In Software Defined Networks (SDN), each flow table entry is dedicated to an individual flow and has an idle timeout value associated with it. Due to limited flow table and controller processing resources, SDN suffers from scalability problem especially when dealing with a large number of flows. As Instant Messaging (IM) applications usually generate too many different flows and idle timeout has effect...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.