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Video streaming applications have implementation issues when the transmission rate is much less than the video playback rate. Caching the beginning part of the video in large storage device before playing is a common solution. In this paper, we propose a bandwidth allocation scheme on video content distribution servers. This algorithm is aim to control the server sending rate with efficient bandwidth...
Joint bandwidth and power allocation in wireless multi-user decode and forward relay networks is proposed in this paper for maximizing the number of admissible users. A suboptimal greedy search algorithm is developed to solve the admission control problem efficiently at low complexity. The condition under which the greedy search is optimal is found. The way we derive such optimality condition for...
To improve the bandwidth efficiency of the classical orthogonal cooperative transmission scheme while maintaining the cooperative gain, a novel non-orthogonal amplify-and-forward cooperative scheme based on distributed space-time code is proposed. In this scheme, the orthogonal characteristic of Alamouti space-time code is utilized to make cooperative users relay on the shared channel resources so...
Due to the fact that Quality of Service (QoS) requirements are not as stringent for non-real-time traffic types, as opposed to real-time traffic, more calls can be accommodated by releasing some bandwidth from the existing non-real-time traffic calls. If the released bandwidth to accept a handover call is larger than to accept a new call, then the probability of dropping a call is smaller than the...
The resource allocation problem of a satellite communication system is important due to the high cost of frequency bandwidth. In systems using DVB-S2 links the optimization is related to the classical multi-knapsack problem. Performance criteria are defined and two heuristic algorithms are presented and compared using Monte-Carlo simulation.
This paper presents a new parallel storage management approach which supports the allocation of shared storage bandwidth on a per-application basis. Existing parallel storage systems are unable to differentiate I/Os from different applications and meet per-application bandwidth requirement. This limitation presents a hurdle for applications to achieve their desired performance, which will become even...
As the number of nodes in large scale network control systems increases, allocating constant bandwidth to all the nodes is neither practical nor efficient in terms of quality of control because of the limited amount of available bandwidth. In order to resolve this issue of bandwidth management in a networked control system consisting of several control loops, dynamic methods for resource allocation...
Data Grid provides geographically distributed storage resources for large-scale data-intensive applications that generate large data sets. Because data is the important resource in data grids, an efficient management is needed to minimize the response time of applications. Replication is typically used in data grids to improve access time and to reduce the bandwidth consumption. In this paper, we...
In information society based on the Internet, demands for high-capacity multimedia services are always increasing. However, it is not possible to offer users satisfactory services, because of lower transmission rate and the limitation of the distance through access networks. In order to solve limitation of transmission rate through access networks and to guarantee Quality-of-Service, it is proposed...
In this paper we apply constrained optimization techniques to optimally allocate bandwidth and transmit power to the users in a cellular network. We utilize partial frequency reuse with one user in the full and one user in the partial frequency reuse regions as inter-cell interference mitigation technique. We show that the non-convex sum-rate maximization problem becomes convex under some simplifying...
This paper investigates the quantizer-coder design problem for networked control systems (NCSs) with finite communication bandwidth constraints, where sensors and controllers are connected via digital channels carrying a finite number of bits per unit time. The main purpose is to specify upper and lower bounds of data rates of communication channels, above which there exists a coding and control law...
Many scientific applications need support from a communication infrastructure that provides predictable performance, which requires effective algorithms for bandwidth reservations. Network reservation systems such as ESnet's OSCARS, establish guaranteed bandwidth of secure virtual circuits for a certain bandwidth and length of time. However, users currently cannot inquire about bandwidth availability,...
This paper proposes a method for measuring the available bandwidth, based on testing network packets of various sizes (variable packet size method, VPS). The range of applicability of the model has been found, it is based on the accuracy of the measurements of packet delays. We have also derived a formula for the upper limit of the bandwidth. Computer simulations have been performed and the relationship...
The dynamic bandwidth allocation providing QoS for VSAT satellite network was investigated. Two bandwidth reservation allocation schemes were presented. These schemes aim at satisfying different QoS requirement and application scenario. And they can afford more bandwidth requests of applications with less bandwidth available. They efficiently manage the bandwidth pool and improve the utilization of...
One of the major challenges for video collaboration lies in video conferencing in low bandwidth and low cost. In this paper we discuss about a server less desktop based video conferencing application that has been built around a highly bandwidth efficient H.264 video compression technology. The proposed solution offers a low cost multiparty video conferencing solution suitable for corporate environment...
In the recent years, researches focus on decay of TCP throughput over wireless links, and many wireless TCP solutions are proposed to deal with this issue. On the other hand, followed by the improvement of hardware technology, new network structures and mechanisms are proposed to enhance wireless communications, for example, the Cognitive Radio (CR) networks. However this new network architecture...
In a internet architecture called CABO, multiple routing architectures can run on a shared physical infrastructure, which is carried out with network virtualization. This paper presents the design and evaluation of a bandwidth allocation algorithm based on multi-commodity flow problem solver integrated with a traffic predictor: linear predictor with dynamic error compensation (L-PREDEC). The basic...
In the future field of communication, broadband multimedia communication satellite will play an important role with its unique advantages. Through analyzing the characteristics of broadband multimedia communication satellite network and the bandwidth allocation, and aiming at the long time delay characteristics of broadband multimedia communication satellite network, this article puts forward the...
Cognitive radios (CR) provides a promising solution to the problem of spectrum scarcity by increasing spectrum efficiency. CR coexists with the licensed users in a network. The network is assumed to be ad-hoc in nature where the master/controller of this ad-hoc network coordinates for spectrum allocation with the surrounding CR. In this paper, a two level hierarchical fuzzy system for adaptive bandwidth...
In this paper analysis of double U-slot loaded patch antenna is presented. The parameter of the antenna significantly depends on slot dimensions. Bandwidth of the proposed antenna is found 21.59 %. The 3dB beamwidth of the antenna is found to be 90° for the central frequency of 1.9 GHz. The theoretical results obtained from the analysis are compared with IE3D simulated and experimental results which...
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