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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...
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...
The paper describes a service model for cost-effective event reporting to clients over a wide-area network. The service provider (SP) maintains multiple protocol mechanisms to replicate the event pages at different proxy nodes of the distribution network. The mechanisms, which embody server-driven and client-driven replica update schemes to synchronize the page copies, reduce the access latency on...
Due to the progress of network multimedia technology, a majority of real-time multimedia applications need multicast communication to transmit information. These applications require a multicast routing protocol in which packets arrive to multicast receptors within a specified QOS guaranteed. D2V-RPS's problem (delay and delay variation RP Selection) consists in choosing an optimal multicast router...
The growth of different types of applications in the Internet arises the need for supporting Quality of Service (QoS) for them. Differentiating services aims to differentiate among applications in order to provide their requirements based on the level of QoS they need and their characteristics. In this paper we introduce a dynamic QoS-Aware queuing algorithm to differentiate services in IP basednetworks,...
Ant colony optimization (ACO) is a kind of new type heuristically optimizing algorithm, having ability to organize itself. In order to solve the problem that QoS routing faces while study at present, this paper proposes a new QoS routing algorithm based on an improved ACO which introduces a routing quality based parameter adaptive mechanism. Simulation results demonstrate that the algorithm has a...
In this paper, the fuzzy logic-based decision algorithm is proposed for queue scheduling. This algorithm is employed to determine the optimal values for achieving fairness control for each queue-type serviced. It takes into account the dynamic nature of the internet traffic as regards to its time-varying packet arrival process that affects the network states and performance. In order that the fairness...
This paper proposes an improved scheduling algorithm that optimizes the allocation of the real-time services and elastic flows in EPON by spreading the real-time service periods lowering the delay and thus fulfilling the QoS requirements.
The most important tendency of future Internet architectures is maintaining the best Quality of Experience (QoE), which represents the subjective perception of end-users using network services with network functions such as admission control, resource management, routing, traffic control, etc. Among of them, we focus on routing mechanism driven by QoE end-users. Nowadays, most existing routing protocols...
The glowworm swarm optimization algorithm is used to solve the multi-constrained QoS multicast routing problem and QoS-GSO algorithm is presented. Our test shows that the algorithm can find optimal solution quickly and has better performance than GA and ACO. Furthermore, for the larger multi-constrained QoS multicast routing problem, the QoS-GSO algorithm can also quickly obtain the correct solution,...
This paper will present an enhanced Dynamic Source Routing (DSR) routing protocol where it utilizes the IPv6 Flow Label to provide Quality-of-Service (QoS) to the real time applications in IPv6 wireless ad hoc networks. Conventional DSR routing protocol is enhanced to induce better QoS in dynamic nature ad hoc networks. Internet Engineering Task Force (IETF) presented Flow Label with 20 bits in the...
The increasing demands for multimedia applications with various QoS requirements arouse the interest of researchers in the Fourth-generation wireless networks such as WiMAX. In order to ensure that the QoS requirements of these applications are met, effective scheduling algorithms must be designed. Even though it may be trivial to ensure that the minimum QoS of all service classes is attained, this...
With the development of Ad Hoc Network, the demand of the users becomes more and more than ever before, some business requires the ability not only to communicate, but also to guarantee delay and bandwidth. This paper puts forward a QoS-based multipath routing protocol QMPSR. It takes bandwidth and delay constraint into account, it can find several paths to provide QoS guarantee. Simulation shows...
Switch is the kernel of Avionics Full Duplex Switched Ethernet (AFDX) network, and its scheduling algorithm affects the switch's performance directly. Employing the Earliest Deadline First (EDF) scheduling method in the switch of AFDX network can overcome the disadvantages of Quality of Service (QoS) for emergent messages. EDF scheduling algorithm assigns a priority level for each arriving message,...
To solve anycast routing problem with multiple QoS constraints, a improved anycast routing algorithm based on simplified particle swarm optimization algorithm and diversity strategy is presented. Firstly, the algorithm simplified the complexity of standard PSO algorithm and improved the convergence velocity extraordinarily by dynamically changing the inertia weight. Then, a mutation operator and diversity...
QoS sensitive applications have become increasingly popular. This paper presents end-to-end QoS control techniques to improve the network usage factor and the destination buffer utilization of the application. The data scheduling process of the QoS sensitive applications has been described. An analytical modeling of QoS performance has been put forward. End-to-end QoS evaluation metrics have been...
Routing in Wireless Mesh Algorithm is concerned with finding “good” source destination paths and has been an active research area since many years. Much of the work is focused on the improvement of global resources, or on the performance of individual transfers. Either case, the routing problem can be casted as a multi-objective with objectives such as load-balancing, end-to-end delay, and path capacity...
We attack the challenging problem of designing a scheduling policy for end-to-end deadline-constrained traffic with reliability requirements in a multi-hop network. It is well-known that the end-to-end delay performance for a multi-hop flow has a complex dependence on the high-order statistics of the arrival process and the algorithm itself. Thus, neither the earlier optimization based approaches...
In order to successfully resolve the network infrastructure's problems the network provider has to improve the service quality. However in traditional ways, maintaining and improving of the service quality are generally determined in terms of quality of service criteria, not in terms of satisfaction and perception to the end-user. The latter is represented by Quality of Experience (QoE) that becomes...
This paper introduces an end-to-end QoS scheme for GPON access networks, which consists of an intra-ONU dynamic weighted fair queuing (DWFQ) scheduler and a multiservice dynamic bandwidth allocation algorithm(MDBA). Both DWFQ and MDBA are integrated in DWFQ-MDBA scheme to support proportional differentiated services (PDiff-Serv) while alleviating the problem of light-loaded penalty resulting from...
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