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.
The limitation of bandwidth resource in a wireless network has driven a large amount of work in resource scheduling to better utilize the available bandwidth. Most of these work aim to maximize the throughput by considering a uniform user distribution across the cellular network. In reality, users may be distributed non-uniformly. This work studies the effects of nonuniform user distribution on throughput...
This paper investigates the resource allocation problem in heterogeneous cognitive radio networks (HCRNs). In this paper, two types of users, i.e., multi-homing and single-network cognitive radio users (CRUs), are considered to coexist in HCRNs. Multi-homing CRUs can access multiple networks simultaneously, while single-network CRUs can be served by only one network at a time. With the aim of maximizing...
Inter-Cell Interference Coordination (ICIC) techniques are proposed as solutions to alleviate the negative impact of interference on system performance, while enhancing the provided Quality of Service (QoS). Typically, the available bandwidth is divided into inner and edge sub-bands. Users are also classified into interior and edge users. The available resources in each zone are exclusively allocated...
EtherCAT is one of the real-time Ethernet protocols widely employed in industrial controls. However, its wireless extension is not straightforward due to the unique on-the-fly bus access method based on summation-frame. This paper explores the possibilities of interconnecting EtherCAT with wireless standards such as IEEE 802.11 and 802.15.4. The gateway design is presented and event-driven interconnection...
In the paper, we studied the solution of resource allocation problem with Coordinated Multi-Point(CoMP) in heterogeneous wireless networks. The utilization of CoMP technology enhances channel quality of users at the edge of cells, but it also brings more complexity to resource management of the network. To reduce this pressure, we exploited a feedback-based method to determine the allocation of users...
Wireless communication networks are very crucial for any operations of all sectors of modern society such as commercial mobile communication or military communication. High-altitude electromagnetic pulse (HEMP) leads severe threats to the survivability and robustness of communication network. Due to the high complexity and hard proven properties of large-scale networks, network-level HEMP effect evaluation...
Aiming at the problem that the dynamic arrival of the virtual network requests in the wireless network environment leads to the unbalanced allocation of the substrate network resources and the low acceptance rate of the subsequent requests, a topology-aware wireless virtual network embedding algorithm (WVNEA-TA) is proposed. By analyzing the dynamic topological attributes of the virtual network and...
An energy-efficient association control algorithm for wireless networks is proposed. Both the wake-sleep switch of each base station and the resource reservation overhead of its neighboring base stations are considered as factors to impact the base station on-off switch decision and the user association. The simulation results show that the overall system energy consumption can be reduced thanks to...
Network coding has shown the promise of significance throughput improvement. In this paper, we study the throughput of two-hop wireless network coding and explore how the maxi-mum throughput can be achieved under a random medium access scheme. In this paper, the problem of the performance of COPE type network coding under dual source coding architecture is solved. An Embedded Markov Chain Model for...
Over the past few years, many major wireless providers restricted their unlimited data plans and replaced them with limited-size fixed-price data packages. While this could be perceived as a disadvantage for customers, it helps the cellular wireless providers to reduce the traffic intensity at their base stations. Then the lower traffic intensity leads to a better service quality and higher rates...
In this paper we propose the Slot Reservation Announcement (SRA) access scheme to minimize the occurrence of channel-access collisions in infrastructure IEEE 802.11 networks under emergency and crowded scenarios. SRA is based on slot reservation in lieu of a randomized backoff approach to increase the channel-access success ratio. The proposed scheme rids IEEE 802.11-like access networks of throughput...
Delivering committed traffic Quality of Service (QoS) per Service Level Agreement (SLA) requires support of critical intelligent traffic management features in LTE eNodeB (and future 5G access nodes), such as Uplink Traffic Shaping and Congestion and Admission Control (CAC). This paper highlights the motivation and merits of uplink traffic shaping in preserving QoS levels per traffic categories over...
The Heterogeneous Wireless Network is a hierarchical structure of different wireless networks. The wireless networks are differ in terms of network coverage, capacity, bandwidth, technology and network operator. In such an environment when a mobile terminal equipped with multiple network interfaces leaves one wireless network and connect to another different wireless network, a Vertical Handoff (VHO)...
The article investigates the algorithm for distributing wireless network traffic in a group of robots. Within the framework of the research, an experiment was performed to compare the dynamic and static aggregation methods for wireless data transmission channels in the autonomous robots networks. The results of the conducted experiment showed that the static method of channel policy allows to increase...
We propose a sequential staging access scheme to minimize the occurrence of channel-access collisions in infrastructure IEEE 802.11 (WiFi) networks under emergency and crowded scenarios in this paper. The proposed scheme is based on separating the functions performed by station for channel access and dedicating states for contention and transmission separately rather than using a single shared state...
Android is an operating system which is available in smartphones and tablets. It uses touch gestures which correlate as activities to perform the operations to embed with the real world actions. Recent technologies adapts android as the primary element because of its salient features and open environment which could be customized in high technological devices. Another secured feature of Android is...
This work explores the theoretical and practical performances of the two most recent IEEE standards, 802.11n and 802.11ac. Experiments were conducted to measure data rates to characterize performance effects of distance and interference between different channels. We conclude that the majority of test cases show 802.11ac achieved higher data rates than its predecessor, as expected. However, performance...
One of the prevalent methods to achieve clock synchronization in star topology based wireless network, is by periodic transmission of a "Beacon" message from the controller. Using this message other nodes locate the start of the time frame established by the controller. This technique has not been energy efficient in case of low duty cycle applications, where the nodes have to receive the...
An emerging usage is to rely on mobile devices (Smartphones or tablets) for large-scale events. They can be used for many applications like live voting or chatting, but also to access all the data related to an event. However, in such case, handling mobile devices trying to access data simultaneously is difficult. A Wi-Fi access point can only handle a limited amount of devices. Current solutions,...
In recent years, as higher performance terminal equipments are spread, the amount of mobile data traffic is growing rapidly by using popularization of streaming services in wireless networks. To overcome this situation, it is considered that Access Points (APs) are deployed densely for capacity improvement. In such an environment, virtualization is a possible technique to use multiple APs efficiently...
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.