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Software-Defined Network (SDN) allows a centralized controller to globally plan packets forwarding according to the operator's objectives. It may require more forwarding rules, and multi-path routing which is allowed in SDN to improve network utilization and throughput means more forwarding rules. However, the forwarding table in TCAM-based SDN switch is an important but limited resource. With this...
In cloud computing environments, each service-oriented application is often instantiated with multiple workflow instances, and each of them provides a specific QoS level for a particular user category. In recent researches, most of works deploy service instances for each workflow independently, and the sharing of service instance is not considered across compositions related with different SLAs. This...
Providing QoS guarantees for hybrid storage systems made up of both solid-state drives (SSDs) and hard disks (HDs) is a challenging problem. Since HDs and SSDs have widely different IOPS capacities, it is not sensible to treat the storage system as a monolithic black box, instead a useful QoS model must necessarily differentiate the IOs made to different device types. Traditional storage resource...
The resource allocation problem has been a very hot topic since the migration from CDMA to OFDMA modulation schemes has taken place for the wireless communication systems. The scheduling problem has transformed into a rather more complex one due to the increased number of resource elements at hand. There have been numerous proposed scheduling algorithms with various analytical approaches to enhance...
In this paper, we study Network Coding (NC) at switching level. We use a novel NC algorithm to select, among received packets, those to be coded and released into the network. The selection is based on address correlation and QoS is attained based on delay optimization. The main feature of our algorithm is that it enhances the coding decision and guarantees decodability of transmitted packets. We...
Self-Organising Network (SON) use cases are seen as key enablers of efficient Long Term Evolution (LTE) system operation. Mobility Load Balancing Optimisation (LB) is a prominent SON use case defined by 3GPP with the scope of balancing the load in a given coverage area by reconfiguring the handover thresholds. When overload is detected at a given cell, the LB reduces the handover thresholds of those...
In service oriented computing applications, different resources in grid systems are encapsulated abstractly as services. Sometime, single service software can provide valuable service functions for service consumers, but most of the time, single atomic service can not satisfy them. In this case, the system builds a new composite service, which selects all available qualified grid service for composition...
Distributed stream processing relies on in-network operator placement to achieve an optimal resource allocation which can use the pool of machines and network resource efficiently. Due to the QoS (Quality of Service) constraints imposed by the application, operator placement is usually treated as an optimization problem with constraints. Trying to get a global optimization is challenging since it's...
The sensor network consist of multi-purpose of node in a scarred networks area. The modern motes that have multiple sensor board on a single radio board, which have different type of transmission rate, required bandwidth, packet loss, delay demands etc. In this paper we proposed Heterogeneous Congestion Control Protocol(HCCP), which controls the efficient rate for heterogeneous traffic. This protocol...
In this paper, a new planning method is proposed for the next generation wireless networks that are based on Orthogonal Frequency Division Multiple Access (OFDMA). As a consequence of the wide variety service demands in terms of data rate and Quality of Service (QoS), the traffic pattern is considered to be heterogeneous. Therefore, the complexity of obtaining Base Stations (BSs) positions increases...
In this paper, we apply distributed optimization dynamics of the mutually connected neural networks to RAN selection in heterogeneous type cognitive wireless networks. We evaluate the performance of the proposed approach by implementing it on an experimental heterogeneous wireless network system called Cognitive Wireless Cloud, which supports vertical handover between different radio access networks...
We consider joint cross-layer resource allocation and inter-system interference avoidance in OFDMA-based multiuser cognitive radio (CR) systems, where the secondary users (SU) can share spectrum with the primary users (PU) without causing unacceptable interference. The objectives are to provide quality of service (QoS) to both real-time and non-real-time services for SUs, and optimize the system throughput...
In this paper, we propose an adaptive cross layer technique that optimally enhance the QoS of wireless video transmission in an IEEE 802.11e WLAN. The optimization takes into account the unequal error protection characteristics of video streaming, the IEEE 802.11e EDCA parameters and the lossy nature of wireless channel. Our proposed technique makes use of two analytical models: a video distortion...
Service Oriented Architectures enable markets of functionally equivalent service providers delivering services at different Quality of Service (QoS) and cost levels. Under these circumstances, there is a need for mechanisms to optimally select service providers at run-time to support a business process execution so that a utility function for the business process is maximized subject to QoS and cost...
This paper focuses on the adaptive resource allocation strategies for two-hop multiuser OFDMA nonregenerative relay networks considering both maximization of total throughput and fairness constraints among users. First, an optimal resource allocation scheme to maximize the overall data rate is developed with separate transmit power constraints both at source and relay nodes. An alternative scheme...
In this paper, we investigate joint sensing and power allocation schemes for OFDM-based cognitive radio (CR) systems. A CR system employing cooperative sensing based on energy detection is considered. Each primary user (PU) band is assigned a subset of sensors and equal gain combining is used at the access point to detect the presence of PU in that particular band. For such a system, we propose algorithms...
The resource allocation and limited feedback scheme are proposed in multiuser MIMO OFDM systems. The optimization model is to maximize the throughput with minimal and maximal transmit rate constraint of users, which can effectively guarantees the QoS requirement of multimedia traffics. The resource allocation is divided into user selection and power allocation, realizing the optimization separately...
With the development of video coding and wireless transformation technology, VOD service based on wireless system is accepted by more and more users. We can watch what we want without any limitation of space. Because of time variability and lack of resource, how to guarantee user QoS is crucial in this transform circumstance. In the paper, an automatic cross-layer scheduling algorithm was proposed...
In recent years, Web services have developed rapidly along with the amazing development of SOA, while many Web services provide the same function. Thus, it has been attracting substantial attention that how to choose Web services to make a service composition in order to satisfy the business needs in SOA. At present, whether the service composition can meet the quality-of-service (QoS) needs of the...
Providing guaranteed quality-of-service (QoS) for resource-hungry multimedia applications over wireless fading channels is challenging. Traditional layered architecture fails miserably in providing the QoS requirement of high throughput, low latency demand of these kinds of applications in wireless mobile networks. Cross-layer design approaches are critical for efficient utilization of the scarce...
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