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Although IEEE 802.11p technology is standardized for road safety and efficiency applications, the channel congestion problem is its key weakness necessitating distributed congestion control (DCC) algorithms on different layers of the communication stack. In this paper, we propose DCC-enabled Contention based Forwarding scheme targeting multi-hop dissemination of Decentralised Event Notification Messages...
Wireless technologies have attracted the attention of the industrial sector, due to their multiple advantages such as ease of installation, flexibility and mobility. However, the application of wireless in industry is most limited to non-critical sensing applications, making the communication of critical instruments and control systems almost exclusively with wired media. Despite this, wireless technologies...
Emergency nodes, i.e, nodes with priority 7 as per 802.15.6 standard play a very important role in facilitating the immediate transfer of information during life threatening situations. These nodes should relay critical information with utmost reliability and in the shortest possible time. IEEE 802.15.6 provides the necessary functionality to these nodes by adapting the contention window sizes as...
We study a simple one-dimensional, discrete-time network model that consists of two nodes moving on a discrete circle, changing their direction of movement randomly, and a single packet travelling in the clockwise direction, using combinations of transmissions between the two nodes (when they are co-located) and physical transports on their buffers. In this setting, we provide exact, explicit expressions...
While buffer-aided relaying improves the diversity of a multi-hop network, its deployment introduces time-delays, thus rendering buffering unreliable for delay-intolerant applications. To alleviate excessive delays, various studies propose delayaware protocols, but at the expense of reduced diversity, and consequently, increased outage probability. Attempts to maintain the diversity of the system...
Wireless Body Area Network (WBAN) is an excellent technology for chronic healthcare monitoring applications. In which, sensor nodes are connected wirelessly in, on or near the human body and also responsible for Data Collection, Data Processing and Data Transmission. Sensor nodes are generally powered by small batteries with sturdily restricted energy resources, so minimizing the energy consumption...
Exploiting multi-user diversity (MUD) means to assign the resources to the user experiencing the best channel conditions. When multicast communication is considered, MUD means that a sender can serve the intended receiver users using one or many data transmission rates. In fact, MUD-based multicast schemes aiming to maximize the multicast throughput (e.g. DOMS and MOST) or to minimize the multicast...
In the Wireless sensor network small size based and low power sensor nodes spreads over a complete geographical area which is connected to each other for performing or control the applications. Every application requires a control center which collects the aggregates data from all sensor nodes. Data aggregation is used for compress data and also for power saving which gives time efficient method for...
A Wireless Body Area Network (WBAN) is a network of wireless sensors and medical equipments located inside or outside the human body for collecting biological signals for various medical and non-medical applications. IEEE 802.15.6 was developed as the standard for WBAN where nodes can access the channel via contention access or contention free access. In this paper, only contention access is considered...
In Battery-Free Wireless Sensor Network (BF-WSN), nodes are powered by the energy harvested from ambience instead of batteries. The nodes may frequently suffer from insufficient energy so that they need to alternate normal operation (such as transmitting/receiving, etc.) with harvesting energy. This brings in extra packet delay for the nodes to deliver data to the sink(s). Therefore, delivering data...
Several interconnected layers of network form the smart grid. The Home Area Network (HAN) is the lowest layer of this grid, where reports about the various parameters associated with electrical devices are generated. For example, parameters could include information about the operation, power consumption, energy losses, power factor, etc. associated with the electrical devices. The reports generated...
The rapid development of medical sensors has increased the interest in Wireless Body Area Network (WBAN) applications where physiological data from the human body and its environment is gathered, monitored, and analyzed to take the proper measures. In WBANs, it is essential to design MAC protocols that ensure adequate Quality of Service (QoS) such as low delay and high scalability. This paper investigates...
In wireless adhoc network, important issue is connectivity between nodes & establishment of link. There are many parameters which influences packet delivery ratio, throughput & energy of a node but it has strong dependency on distance between the nodes & their placement. For commercial wireless network uniform distribution of nodes are impractical but implementing connectivity of non-uniform...
Wireless Multimedia Sensor Networks (WMSNS) are composed of a number of sensors which usually the most important data generated by them are video data. According to massive amounts of data, congestion control is essential for quality preservation of the video data. Quality of video data depends on low latency and high reliability. In this paper, an approach for congestion control is proposed. In the...
Visible Light Communication (VLC) is a new emerging technology, where delay is a Quality of Service (QoS) criterion for communication. This paper presents an analysis of the theoretically possible end-to-end delay and hop number for Light on Demand (LoD) and VLC-based multihop networks. Taking the human eye perception as a relevant parameter, total delay is analyzed at the Open Systems Interconnection...
Given a wireless network topology, a maximum number of users with specified Quality of service “QoS” requirements, including delay constraints, are allowed to transmit and receive data. Therefore, the best solution is to establish a partition of radio resources that provides a minimum quality for each user in the network. If all users can not be served in the same time, it is important to classify...
Internet of Things (IoT) is considered to be the next revolution in the field of wireless communications. This concept involves mapping of physical world to virtual (cyber) world. It is achieved by interconnecting devices having sensing capabilities using unique addressing scheme and passing their collective information to the IoT cloud. However at present, these devices belonging to different technologies...
Social connections among network users have been well investigated as an additional opportunity in network design, such as in routing strategies and trusted networking. This paper presents a paradigm shift that explores the design and performance analysis of combining social links jointly with communication links to support message delivery in wireless networks. In a combined social and communication...
Sharing Transmission Opportunity period (TXOP) technique is recently defined by IEEE 802.11ac to allow simultaneous downlink transmissions. In this paper, we focus on the basis of this technique and the behavior of the access point (AP) to manage the multi-user access. We discuss the different steps required to allow simultaneous downlink transmissions. Based on simulation results, we prove that TXOP...
In two-tier heterogeneous cellular networks (HCN) where small cells are deployed overlaid with macro cells, base station (BS) association is one of the fundamental problems, which becomes even more challenging when the small cell BSs are connected to the gateways via imperfect backhaul links, e.g. using wireless technologies. In this paper, we first analyze the mean packet delay in radio access and...
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