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To tackle complex and massive number of jobs sent by end users, a powerful and dedicated computational resources are required. Grid computing provides such environment in which applications may run for a quite long time. Therefore, efficient scheduling policy is indispensable. In our previous work, a mechanism named Swift Gap followed by developed completion time rule is introduced. This paper deeply...
In this paper, we evaluate QoS (Quality of Service) and QoE (Quality of Experience) characteristics of 2K and 4K video distribution using MPEG-DASH (Dynamic Adaptive Streaming over HTTP). Evaluation results conclude that smaller playout buffer size contributes to QoE improvement.
The high risk of random access collisions leads to huge challenge for the deployment massive Machine-Type Communications (mMTC), which cannot be sufficiently overcome by current solutions in LTE/LTE-A networks such as the extended access barring (EAB) scheme. The recently studied approaches of grouped random access have shown a great potential in simultaneously reducing the collision rate and the...
To deal with the severe challenge from explosively increasing mobile users' multimedia service requests in mobile networks, introducing cloud-based computing platform and content caching into radio access networks (RANs) has become an effective emerging technique. In this paper, we propose a collaborative hierarchical caching framework in cloud RANs (C-RANs), which minimizes the access delay of content...
The OpenFlow-based SDN is widely studied to better network performance through providing flexible routing paths. However, being designed to configure path hop-by-hop, it faces the scalability issue — both the flow table overhead and path setup delay are unacceptable for large-scale networks. In this paper, we propose PACO, a framework based on Source Routing (SR) to address that problem through quickly...
Software Defined Networking and Network Function Virtualisation provide significantly more flexibility and control when provisioning QoS for delay sensitive services. Network delay can have a detrimental impact on VoIP quality and, therefore, minimising delay can help maintain the quality and prevent call dropping. This paper proposes a queuing scheme based on packet delay for prioritising VoIP calls...
Nowadays, the demands for composite services with devices such as sensors/actuators and Web services have increased [1]. Many kinds of cloud services that can connect to real world, as typified by image recognition or speech recognition has come into widespread use to address the limitation in information processing on devices. In that situation, sensors are also provided as sensor services that senses...
In real-time multicast, delay and inter-destination delay variation of group members are bounded above by a value. The problem is known as Delay and Delay Variation Bounded Multicast Tree (DVBMT), which is proven to be NP-complete. In this paper, we propose a directional approach (DCS) for core selection and tree generation satisfying delay and inter-destination delay variation constraints. After...
A fundamental problem in QoS (quality-of-service) routing is the multi-constrained path (MCP) problem. The MCP problem used the shortest path with respect to a single edge weighting function as an approximate solution to MCP. For solving MCP problem was offered a lot of methods. One of these methods is based on Lagrangian Relaxation. These algorithms allow finding the shortest paths from the source...
Consumer acceptance is of great interest in the adoption of novel multimedia products and services. A number of factors can greatly influence the customer experience during a video session, impacting the acceptability of the product or service. Factors such as the Technical Quality (TQ) which covers the technical aspects of the signal quality can be controlled from the network provider. On the other...
Underwater Acoustic Sensor Network (UASN) is the enabling technology for a wide range of applications including naval surveillance, oil platform monitoring, earthquake forewarning, climate and ocean observation, and water pollution tracking. However, considering the enormous acoustic sensor devices and unique services of UASN, some challenges are emerging to the traditional cellular access and core...
Flow-Aware Multi-Topology Adaptive Routing (FAMTAR) is a new mechanism which provides the ability to use multiple paths between two points in a network. When the primary path becomes congested, a new path is found and used. However, when all possible paths are congested, new flows are still accepted on one of the congested paths which degrades the observed quality of service. Therefore, in this paper,...
Electric Vehicles (EVs) are gradually becoming more attractive, as they offer economically viable and environmentally friendly transportation solutions when compared to their gas-powered counterparts. This trend requires wide deployment of fast charging stations to extend EV driving ranges. However, the operation of such facilities could become a bottleneck, as the power demand from the grid, especially...
Agent-level negotiations between an application and a cloud service provider (SP) face two complexities: i) inaccuracy of computational models in capturing the behavior of a cloud-based system made up of diverse components and resources; and ii) disparity in the goals and priorities of an application and the SP in exercising a cloud-based system. The paper suggests trial actions by an agent to learn...
In this work we seek to achieve VoIP end users' profile privacy without violating the QoS constraints on the throughput, end to end delay, and jitter, as these parameters are the most sensitive factors in multimedia applications. We propose an end-to-end user anonymity design that takes into consideration these constraints in a hybrid environment that involves ad-hoc and infrastructure networks. Using...
The paper investigates the balance between Quality of Service (QoS) and power consumption for a traffic queue. Automatic adaptation to the power of the packet processing engine is sought through a heuristics and an optimal control strategy. The study allows to track the behavior of the system over time, thus avoiding the optimization of the steady state behavior of the system, which is hardly applicable...
Brief episodes of network faults and performance issues adversely affect the user Quality of Experience (QoE). Besides damaging the current opinions of users, these events may also shape user's future perception of the service. Therefore, it is important to quantify the impact of such events on QoE over time. In this paper, we present our findings on the temporal aspects of user feedback to disturbances...
Usage of multimedia communication in everyday life has seen a remarkable growth. Vast in Bandwidth demand often result in lower network performance and reduced quality of user experience during congestion. In this paper, we will address congestion control problem while providing quality of service (QOS) of delay for inelastic flows like video streaming, IPTV, etc. First, we propose an extension of...
Unified communications (UC) offers users an uninterrupted communication service regardless of the device which the user is using, the heterogeneous networks to which he might be connected, the physical and logical context in which he exists and the diversity of QoS requirements by different session participants and services. Providing and maintaining an acceptable level of QoS, as perceived by all...
In this paper we investigate the problem of delivering quality of service (QoS) guarantees in the context of communication networks, studied through stochastic fluid models. The paper follows the approach developed in (C. G. Cassandras, et al., 2002), (C. Panayiottou, et al., 2004). Its main contribution is that it develops infinitesimal perturbation analysis (IPA) estimators of a cost function that...
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