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This paper proposes a method of TCP multi-pathization for IoT network by SDN. The method distributes packets according to the congestion between paths and IP packet length. Since it is performed over SDN, no changes of existing protocols and devices are required. The authors implement the method by actual IoT devices and evaluate QoS by experiment. The results of the experiment show that the TCP throughput...
QoS of applications in an edge node of mobile edge computing (MEC) could degrade due to congestion of wireless access or short of mobile edge computing resource. In order to improve QoS such as TCP throughput, we propose a VM migration method, which takes a VM from congested node to another node in a mobile edge. Users can choose a far but less-congested node, instead of a near but congested node...
The ability to provide a high Quality of Service is a crucial aspect in the acceptance and widespread dispersion of the Industrial Internet of Things and it has a key role to enhance the end user experience. The emerging fog cloud computing architectural concept aims to diminish the experienced latency while simultaneously providing a seemingly unlimited quantity of computational power by moving computations...
Key-value stores (e.g., Memcached) and web servers (e.g., NGINX) are widely used by cloud providers. As interactive services, they have strict service-level objectives, with typical 99th-percentile tail latencies on the order of a few milliseconds. Unlike average latency, tail latency is more sensitive to changes in usage load and traffic patterns, system configurations, and resource availability...
Datacenter servers often colocate multiple applications to improve utilization and efficiency. However, colocated applications interfere in shared resources, e.g., the last-level cache (LLC) and DRAM bandwidth, causing performance inefficiencies. Prior work has proposed two disjoint approaches to address interference. First, techniques that partition shared resources like the LLC can provide isolation...
Downlink data rates can vary significantly in cellular networks, with a potentially non-negligible effect on the user experience. Content providers address this problem by using different representations (e.g., picture resolution, video resolution and rate) of the same content and switch among these based on measurements collected during the connection. If it were possible to know the achievable data...
The Trafïîc Flow Description (TFD) option is an experimental option of the IP protocol, designed by the Authors, able to assure signaling for QoS purposes. The option is used as a carrier of knowledge about forthcoming traffic. If planning horizons are short enough, this knowledge can be used for dynamic bandwidth allocation. In the paper an analysis of QoS assurance using the TFD option is presented...
Most Information Technology (IT) services nowadays rely on one or multiple data centers. In this paper, we propose a Quality of Service (QoS) scheme for Intra/Inter data center communications systems. The proposed scheme is based on differentiation of traffic into different class categories. The differentiation is based on the source of traffic as well as the specific traffic's requirements. We conduct...
In 2013, U. S. data centers accounted for 2.2% of the country's total electricity consumption, a figure that is projected to increase rapidly over the next decade. Many important workloads are interactive, and they demand strict levels of quality-of-service (QoS) to meet user expectations, making it challenging to reduce power consumption due to increasing performance demands. This paper introduces...
Network Functions Virtualization (NFV) is a technology for running software-based functions on commodity hardware, which can lead to cost savings and flexible functionality. However, due to the software processing of network functions, the performance of Virtualized Network Functions (VNFs) is considerably degraded in relation to the types of VNFs and the configuration of VNF applications. Therefore,...
The orientation towards web service technology gives a raise to huge number of functionally similar web services. Hence, quality of service is becoming more important and even essential in web service technology as a distinctive criterion. Generally providers have sufficient information about the really provided quality, however, clients don't. Service level agreements that define the relationship...
Since the early days of Quality of Experience (QoE) research, relationships to Quality of Service (QoS) and corresponding QoE-QoS models have been of great interest to the research community. However, the manifold quality transformations throughout the communication stack, together with accessibility issues of QoS parameters inside networks, hamper availability, applicability and generality of such...
In today's data centers, storage hardware is getting virtualized and shared across multiple tenants. The storage virtualization is expected to significantly increase resource utilization, and consequently provide infrastructure providers with tremendous cost savings. In a shared environment, however, demanding tenants can severely impact the IO performance of co-located tenants. Therefore, in order...
Mobile applications such as VoIP, (live) gaming, or video streaming have diverse QoS requirements ranging from low delay to high throughput. The optimization of the network quality experienced by end-users requires detailed knowledge of the expected network performance. Also, the achieved service quality is affected by a number of factors, including network operator and available technologies. However,...
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...
Mobile applications such as VoIP, (live) gaming, or video streaming have diverse QoS requirements ranging from low delay to high throughput. The optimization of the network quality experienced by end-users requires detailed knowledge of the expected network performance. Also, the achieved service quality is affected by a number of factors, including network operator and available technologies. However,...
Quality of service is the key indicator for service oriented architectures, because it directly expresses the operability and computational nature of the system. As such, we propose a quality evaluation framework for multi service multi functional hierarchical SOAP based web service. The overall interoperable quality is evaluated through load testing using Mercury Load Runner with Apache Tomcat web...
In the era of big data and cloud, distributed key-value stores are increasingly used as building blocks of large-scale applications. Comparing to traditional relational databases, key-value stores are particularly compelling due to their low latency and excellent scalability. Many big companies, such as Facebook and Amazon, run multiple different applications and services on top of a single key-value...
User equipments (UEs) such as smartphones and tablets are widely used in heterogeneous wireless networks which include different technologies like WiFi and Long Term Evolution (LTE) systems. Implementing traffic steering effectively for user equipments to maximize their quality of service has become a key challenge these years. Therefore, in this paper, we propose a device controlled mechanism. We...
Cloud Computing is a major area of research. Cost and Load balancing has become an important QoS parameter. Load Balancing directly affects the Reliability, Response Time, Throughput and Energy Efficiency of a Server. A good Load Balanced architecture implies minimized overall time, less server failure, minimized response time, increased throughput and less wastage of energy. Such architecture also...
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