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.
Using content delivery networks (CDNs) for video distribution has become a de facto approach for today's video streaming, due to the easy usage and good scalability. Today, it has become a norm rather than an exception for video providers to hire multiple cloud CDNs for their video services in a pay-per-use manner, to not only serve users at different locations, but also reduce the operation costs...
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...
The performance of IEEE 802.11e enhanced distributed channel access (EDCA) mechanism effects by the network loads. It is observed that when the number of users increases in each access category, the delay significantly increased in EDCA algorithm. The performance improvement in EDCA algorithm in fluctuating network load is a challenging task. To improve the performance of EDCA algorithm for delay...
The research community has devoted much attention to the use of classic network technologies for advanced traffic engineering, but the use of software-defined networking (SDN) for this purpose, particularly in regards to Quality of Service (QoS) optimizations, remains relatively unexplored. We have developed a QoS framework that leverages SDN capabilities to achieve optimal throughputs for all QoS...
As a significant step for vertical handover, optimal decision for network selection has been attracting high and sustaining attention over the past decade, especially on the topic of meeting user's rapidly increased requirements. However, the instability of the basic decisive parameters is ignored in most of the investigations, which might finally lead to a high misjudgement ratio. Therefore, great...
In this paper, we propose a policy-based model to achieve end-to-end (E2E) service negotiation among multiple domains that constitute E2E path. The model relies on a centralized approach, realized via the third party (3P) agent, which acts as a proxy server for local (per-domain) management entities. We demonstrate the proposed model on the implementation of policies for allocation of performance...
Software Defined Networks (SDNs) allow a centralized controller to globally plan packets forwarding according to the operator's objectives. The realization of global objectives requires more local forwarding rules. However, the forwarding tables in TCAM-based SDN switches are limited resources. In this paper, we concentrate on satisfying global network objectives, such as maximum flow, with the limitation...
Increasing complexity of the modern wireless networks forces researchers to use more sophisticated schemes for handover procedure. Performance evaluation of the schemes is one of the most important tasks, which must be resolved for the sake of proper selection of the decision-scheme. Known evaluation approaches were analyzed and verified, modular method for the evaluation of handover schemes and strategies...
In Service-Oriented Architecture (SOA), dedicatedintermediate nodes called load balancers are usually deployed in data centers (DC) in order to balance the load among multiple instances of an application service and to optimize the resource utilization. However, the addition of these nodes increases the installation and operational cost of DCs. These load balancers distribute incoming flows to multiple...
The development of network services makes their requirements for bandwidth become higher and more various, which leads to difficulty in Quality of Service (QoS) guarantee. In this paper, an OpenFlow switch featuring Weighted Fair Queuing (WFQ) algorithm is proposed. The system is implemented into NetFPGA 1G board which utilizes Xilinx Virtex II Pro 50 technology. The results have shown that our circuit...
With advances in wireless technology and the increase in popularity of mobile devices, more and more people now rely on mobile devices for multimedia services (such as video streaming and video calls). A mobile device can be connected and roamed to different networks in heterogeneous wireless networks. The Media Independent Handover (MIH) framework is designed by the IEEE 802.21 group to support seamless...
OTN technology has been widely used in smart grid, which improves transmission speed, transmission efficiency and transmission capacity of the network. In order to supervise the operation of the network in real time and improve quality of service (QoS), we need to make a quantitative assessment of operation quality for OTN in smart grid. In this paper, we propose LM-BP evaluation method to assess...
This paper presents the cross layer network design of traffic management in terms of throughput, spectrum efficiency, congestion control, latency and prioritized Quality of Service (QoS) for broadband satellite network. Design aspects include queueing structure and algorithms for link layer multiplexing and queue servicing, flow control between Layer 2 and Layer 3, scheduling and QoS provisioning...
In this paper, we proposed a utility-based energy-efficient (UEE) resource allocation algorithm in downlink OFDMA heterogeneous networks (HetNets) with mixed traffic. The resource allocation problem is formulated as a mixed integer nonlinear programming (MINLP) problem first. Then an iterative algorithm is proposed to optimize the resource block (RB) scheduling and power allocation alternatively,...
One of the important goals collaborative tasks achieve is to improve the entire efficiency of business processes. The influence should be discovered between resource services according to the order the activities use in business processes. However, it is especially difficult in collaborative task as each participant organizations use resource services independently. In a workflow, resource services...
Advancement in computing technologies and increasing demand of computing resources (such as network, storage, servers, applications etc.) has made cloud computing as main computing basis for small or large IT enterprises. The enterprises which are not able to establish their own infrastructure and resources are taking help of different (Infrastructure as a Service) IaaS service providers on basis...
The EDCA protocol was designed to enhance the functionality of the IEEE 802.11 WLAN through the introduction of different channel access parameter values for different traffic types. This enables some degree of service guarantee for traffic depending on their QoS requirements. While the improved standard has recommended values for the channel accessing parameters, it does not take into account the...
Cognitive radio is a promising technology that aims to enhance the utilization of the radio spectrum. This is achieved by providing opportunistic access to the unlicensed users or the secondary users. In this paper, quality of service (QoS) in cognitive radio networks is investigated for a heterogeneous network model. A modified cognitive radio spectrum sharing algorithm based on the Hungarian algorithm...
The rapid development of wireless communication imposes several challenges to support QoS for real-time multimedia applications such as video stream applications. Researchers tackled these challenges from different points of view including the semantics of the video to achieve better QoS requirements. The main goal of this research is to extend the UDP protocol to realize a distributed sequential...
In this paper, we investigate an energy efficient transmission scheme for video streaming in buffer-aided relay networks. In order to minimize the average energy consumption, we propose an energy-efficient transmission algorithm (EETA), which selects either the source relay (S — R) or the relay user (R — U) link for transmission depending on the instantaneous channel state information as well as the...
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.