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 following topics are dealt with: electromagnetic wave propagation; distribution system; protocols; WiMax; multimedia signal processing; transmission system; electricity market; analog circuit; smart grids; wireless communication; power system; microwave power amplifier; EMI; antennas; wireless broadband network; electrical machine monitoring; pervasive computing; wearable devices; control system;...
In this paper, we develop new energy-efficient, radio resource management schemes for green wireless networks. Our goal is to optimize energy consumption at the network scale while preserving the Quality of Service (QoS) perceived by users. We specifically propose two new sleep mechanisms for base station where a number of resources in system can be shut down for some traffic scenarios in one of two...
Capacity and coverage of a Frequency Division Multiple Access (OFDMA) network can be greatly enhanced by dynamically allocate the radio transmission resources. By including the radio resources of cooperative nodes and taking into account the fairness issue, we present a simple suboptimal solution to the problem of radio resource allocation in relaybased OFDMA cellular systems. We restrict our investigation...
To mitigate inter-cell interference (ICI) and achieve higher spectrum efficiency, fractional frequency reuse (FFR) has been widely adopted by the next generation wireless systems, wherein different frequency reuse factors are applied to cell center and cell edge zones. In such conventional FFR, a contiguous radio spectrum is partitioned in a fixed fashion across all cells for edge and cell center...
This paper presents transport methods that overcome loss and contention in radio networks while servicing multiple applications in a System of Systems environment. UDP with application-level retry avoids TCP's tendency to misinterpret loss as contention. Prioritized FIFO queues combine various data streams (Unicast and Multicast, reliably delivered and send once, low and high priority, small messages...
Using network coding in wireless networks can increase throughput and reduce energy consumption. Recently there are many works focusing on how to utilize network coding to increase throughput while there are few works considering the quality of service such as delay. This paper focuses on network coding based broadcast scheduling in wireless networks with the packet delay constraint and aims at minimizing...
In this paper we consider a two-hop relay network consisting of a source, a destination and multiple relay nodes. For a given quality of service (QoS) requirement such as transmission rate between the source and the destination, relay nodes have an adaptive power control scheme to meet the QoS requirement. The adaptive power control scheme is assumed to be based on the channel condition between relay...
We consider a multi-channel cognitive radio network (CRN) where multiple secondary users share a single channel and multiple channels are simultaneously used by a single secondary user (SU) to satisfy their rate requirements. In this competitive CRN, our interest is in determining optimal power and rate distribution choices for each SU while maintaining fairness in “quality of experience” across all...
Handover interruption as a critical issue has long been studied in wireless networks towards a seamless and lossless target. This paper proposes a model for gap-utilized handover, using traffic-pattern learning based on HMM, and presents the analytic details regarding to the QoS performance. The handover exploiting traffic gaps, i.e., periods of no packet transferred, can reduce packet loss/delay...
Network selection is one of the key issues in heterogeneous wireless networks. However, very few efforts have been made on both algorithm and management of network selection to satisfy the individual requirements of every single user, so as to attract customers in the future user centric business mode. This paper takes the following steps toward addressing this problem: 1) a novel user preference...
Orthogonal Frequency Division Multiple Access (OFDMA) is the multiple access technology that may be used in the next generation broadband wireless communication systems. We devise some new algorithms which use the linear combination of two variables as the objective matrix. In these algorithms, both cell throughput and user fairness are considered. To guarantee the user quality of service (QoS), we...
Modern wireless multiuser multicarrier systems (MU-MC) incorporate Dynamic Resource Allocation (DRA), Adaptive Modulation and Coding (AMC) and Power Control (PC) to exploit multiuser diversity and achieve higher system throughput. In the literature, only a few proposed algorithms deal with the contiguous DRA problem (contiguous collection of resources). This paper formulates this high complexity problem,...
Efficient power allocation is a key element in supporting real time services' QoS prerequisites in the uplink of CDMA wireless networks. Game-theoretic approaches have been applied to study the power control problem, aiming at users' utilities maximization. However, in many cases the corresponding Nash equilibrium solutions introduce several inefficiencies. To tackle this problem in this paper we...
The area of networking games has had a growing impact on wireless networks. This reflects the recognition in the important scaling advantages that the service providers can benefit from by increasing the autonomy of mobiles in decision making. This may however result in inefficiencies that are inherent to equilibria in non-cooperative games. Due to the concern for efficiency, centralized protocols...
Multimedia streaming applications have stringent QoS requirements. Typically each packet is associated with a packet delivery deadline. This work models and considers real-time streaming broadcast for stored-video over the downlink of a single cell. The broadcast capacity of the system subject to deadline constraints are derived for both uncoded and coded wireless broadcast schemes. Even under the...
The following topics are dealt with: pervasive computing; context reasoning; quality of service; mobile peer-to-peer computing; ubiquitous communication; social networking; pervasive learning; health care; wireless sensor network; middleware; pervasive wireless networking; smart environment; and World Wide Web.
Video streaming applications are commonly used in both wired and wireless environment; however, wireless links are burden by higher packet loss ratio and delay variation. In order to make video transmission possible in wireless networks MPEG video coding is usually used to reach the bandwidth constrains of the links. The video quality and compression ratio depends on Group of Pictures (GOP) structure,...
In this paper we validate through simulations the convergence properties of our earlier proposed balls and bins channel allocation algorithm. The algorithm supports dynamic channel allocation based on local link quality information and does not require exchange of network information. Each radio evaluates periodically a cost function related to the desired QoS. Based on the calculated cost the radio...
Due to the increasing demand on wireless technologies, many researches targeted the improvement of quality of service (QoS) of global wireless networks such as 802.11 and 802.16. Most researches targeted the physical layer (PHY) parameters and medium access control (MAC) mechanisms to improve QoS, but they didn't guarantee the QoS of each type of application. To overcome this deficiency we provide...
The following topics are dealt with: mobility; quality of service; measure based and classification mechanism; clusters, grids, and distributed systems; processors and input/output systems; data security; multimedia communications; protocols; wireless networks; computer applications; real time systems; and voice over IP.
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.