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Today's networks are dominantly based on the Shortest Path First (SPF) routing algorithms. These algorithms assign weighting factors to links statically, such that the routing tables are recalculated only when a topology change occurs. As a result, the network traffic is often unevenly distributed, thus causing the congestion on some links even when the total traffic load is not particularly high...
The fast expansion of Internet-based multimedia services like Netflix, Skype or YouTube -- the so-called Over-The-Top Services (OTT) -- have increased the quality requirements of these services from the point of view of the user. In this sense, it is important not only to ensure a good Quality of Service (QoS) level -- technical metrics -- but also a high level of Quality of Experience (QoE) -- subjective,...
Today, applications that take the congestions caused by traffic jams into account already exist. During rush hour, it is common that multiple congestions occur on the road network. If the number of traffic jams is too big, the radio stations that transmit TMC messages to the end user often only report the longest traffic jams. Those applications use the Traffic Message Channel (TMC) technique to calculate...
In recent years, the usage of data is more than available resources. Due to fast growing requirements and development of the green communication technology may lead to go for many energy saving designs in networks, the faster growing network is LTE(4G), which is going to give more traffic, because of the user requirements, so the issues in the mobile networks are (1) traffic in networks (2) more energy...
This paper proposes Road-Side Units PlacementAlgorithm (RPA) to provide vehicles with the multihop Qualityof-service (QoS) data delivery in vehicular networks using infrastructurenodes, such as road-side units (RSUs) and relay nodes. We consider inbound delivery from RSU to vehicle. We definethe QoS of data delivery with the mean and standard deviationof end-to-end data delivery delay. In this paper,...
The paper formulates methods to measure the trustworthiness of a network system S under hostile environment conditions incident on S. How good is the system S in meeting the QoS expectations of applications (i.e., the QoS capability of S) is quantitatively measured — say, on a [0, 1] scale. We employ model-based assessment tools (e.g., PO-MDP) to benchmark the QoS capability by stress-testing S with...
Network bandwidth and server capacity are gradually becoming overloaded due to high demand and rapid evolution of high quality multimedia services over the Internet. Internet Protocol Television (IPTV) is among the multimedia services that demand more of network and server resources, especially with the emergence of Mobile IPTV. It is imperative for service providers to maintain good quality management...
Routing protocols is important part of the stable Designing of Hybrid wireless networks. Maintaining network topology and multi-hop routing are the main challenges of hybrid wireless network. To overcome these issues we analyze different QoS-aware routing protocols, those are ZRP, CEDAR, MRP, GAMAN, QMRPD, QOLSD, AQOR, TDR, QAODV, QOD, and D-adapt OR. Those protocols based on QoS-routing parameters...
Obtaining Energy Efficiency (EE) is very difficult for wireless communication systems especially for cognitive radio network (CRN). The investigation here is with the mean EE maximization problem for secondary user (SU) with both primary user (PU) and secondary users. The solution to the problem starts by considering both the peak and mean transmit power constraints for the SUs and outage probability...
The services oriented architecture along with web services came out with the base for a new revolution in the field of system management tools and distributed application. Both service-oriented architecture (SOA) along with Web services for software interoperability as a middleware shows a significant role. With such deployment of quality of services (QoS) constraints such as reliability, services...
Seen the diversity of the technologies of current access networks, the mobile terminals have the possibility of reaching several types of networks at the same time under the concept “Always Best Connected” (ABC). This imposes a good management of the Vertical Handover (VH). We distinguish three phases of the VH: handover initiation, network selection and handover execution. To optimize network selection...
A Wireless Sensor Network (WSN) is a set of nodes that sense and process information from the surrounding environment. For some critical applications, WSNs are very restrictive in terms of quality of service (QoS). QoS should be guaranteed but also energy should be saved. In our work, we consider the problem of power allocation in heterogeneous Wireless Sensor Networks (WSNs), especially critical...
This paper introduces a new contention window (CW) adaptation algorithm with the main objective of reducing energy consumption while maintaining required Quality of Service (QoS) for multi-class traffic with different priorities. The main concept of the proposed algorithm is adaptively adjust the contention window (CW) size according to the network load conditions and each traffic class applies different...
The usage of hybrid network consisting of massive multiple input multiple output (MIMO) co-existing with small cell networks (SCNs), are considered to be a key technique for the future wireless communication systems. However, the co-existing SCNs not only require on-site hardware installation, but also increase the static power of the system thereby reducing the energy efficiency (EE). To circumvent...
To meet the service level agreement (SLA) between the cloud user and the cloud service provider, the service provider has to pay more. The cloud resources are allocated not only to satisfy the quality of services (QoS) those are specified in SLA, but also need to reduce energy utilization. Therefore, task consolidation plays an important role in cloud computing, which map users service requests to...
As a breakthrough technology under 3GPP, LTE has attracted attention worldwide. Main features include enhanced peak data rates, lower delay, increased cell edge throughput. For an LTE system, serving a large number of users requires an efficient RRA algorithm which has not been standardized for the system and is still an open end for development. Researchers have proposed various algorithms some of...
In an open cloud computing environment, many functional-equivalent services can be provided by different providers with different SLA (service Level agreement) levels, then it is an important problem for service consumers to select the optimal one from lots of service candidates. Considering drawbacks of existing methods, we propose a systematic approach for this multi-objective optimization problem...
The increase in the rates of energy consumption in cloud computing infrastructures, besides imposing scalability limits, raises concerns about monetary issues and damage to the environment. This paper proposes an algorithm named ε-PUC-Fit, which aims at improving energy efficiency in cloud computing environments through dynamic consolidation of virtual machines. The proposed algorithm has...
Distributed Real-time Embedded (DRE) systems working in open environments often need to enforce utilization bounds on multiple processors in order to manage CPU resources adaptively even when task execution times are unforeseeable. An event-based utilization control algorithm is proposed, and the algorithm applies to mixed (continuous and discrete) rate adaptation in DRE systems including tasks that...
With the explosive growth number of services in cloud computing environment, how to accurately and rapidly discover the services that can meet user's functional and nonfunctional requirements is a challenging subject. Aiming at issues of service inefficiencies and low precision in the existing service discovery methods, a model for service discovery based on functions and QoS clustering is proposed...
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