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In mobile Ad-hoc networks forwarding data through intermediate relays extends the coverage area and enhances the network throughput. Dynamic assignment of routes for data transmission from sources to destinations that is optimized based on channel conditions in a cross-layer manner could provide improved performance. We consider a general multiuser two-hop transmission, where each flow is subject...
In Wireless Access in Vehicular Environments (WAVE), the terminal devices are usually highly mobile vehicles or transportation tools, which handoff much more frequently than those in wireless networks. However, the quality of network services, like VoIP and multimedia streaming, will be seriously influenced by too frequent handoff or too long handoff latency. As a result, traditional handoff mechanisms...
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...
The paper presents the simulation results of the comparison of two Fair Queuing (FQ) based QSD (Queue scheduling discipline) algorithms with Weighted Round Robin (WRR). We propose the comparison of Weighted Fair Queuing (WFQ), Worst-case Fair Weighted Fair Queuing+ (WF2Q+) with WRR from the point of their usage in modern convergated telecommunication networks.
As DCF (Distributed Coordination Function) in IEEE 802.11 standard adopts distributed contention with random back off time, it results in uncertainty and packet delay and jitter. It is not suitable for real-time data transmission and cannot meets the needs to access media resources at fixed time interval for some application, such as VoIP. This paper proposes a TDMA-like distributed multiple access...
Multicast with QoS (Quality of Service) is regarded as a promising solution for group multimedia applications in NGI (Next Generation Internet). Due to the characteristics of difficulty on exact measurement and complete expression of network parameters, a flexible QoS multicast routing algorithm based on Artificial Fish Swarm (AFS) algorithm is presented with introduction of principle of fuzzy mathematics...
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...
Multiparameter m-health scenarios with bandwidth demanding requirements will be one of key applications in future 4G mobile communication systems. These applications will potentially require specific spectrum allocations with higher quality of service requirements. Furthermore, one of the key 4G technologies targeting m-health will be medical applications based on WiMAX systems. Hence, it is timely...
This work shows limitations in the bandwidth exploitation by GPON users due to the computer operating systems. In particular, our end-to-end FTP-based bandwidth measurements point out the strong impact of TCP implementation.
The WiMAX features longer transmission distance and more accomplished support of QoS than other wireless access technologies such as 802.11. Since the standard did not specify the QoS based packet-scheduling algorithms which run on the base stations, those algorithms are open for alternative implementations. In this paper, we propose a scheduling algorithm for burst traffic in the WiMAX base station...
Web service composition can make use of distributed services with various functions to accomplish a specific task. Service binding and composition become keywords to service computing. In the context of workflow management, service binding plays an important part in forming a concrete workflow after an abstract one is submitted. Existing research is devoted to selecting a set of servers to run the...
Today, the user is interested in comparing one service with another in terms of universal, user-oriented performance parameters which apply to any end-to-end service. The QoS concept encapsulates the idea that different data streams could be treated differently by the network depending upon the service being carried. QoS features shall provide the required performance of latency, jitter and packet...
With widespread deployment of multicast over Wireless Local Area Networks (WLANs), several issues including fixed data rate transmission, multicast key distribution security, and overlapped multicast address have to be addressed for accommodating an efficient multicast scheme for WLANs. The latter problem can be addressed by utilizing Internet Protocol version 6 (IPv6) which provides significantly...
Cooperative wireless networks supporting multiple services necessitate the application of a robust bandwidth allocation policy to ensure Quality of Service (QoS) provision to different applications. In this work, a load dependent bandwidth allocation technique is presented considering traffic priority and buffer load in the relay nodes of a cooperative communication network. An analytical approach...
The handover performance in mobile network is the most important factor that can influence the Quality of Service (QoS). Today many countries in the world have migrated to more advanced mobile communication system such as the IEEE 802.16e mobile WiMax network. This mobile WiMax has been proven to be more stable and applicable for fixed, portable, nomadic and mobile network. The parameters such as...
For the past few years, wireless networks have played bigger role in connecting people. Demand for it services has increased tremendously. In order to provide better services and choices for high-speed internet access and multimedia service for business and residential customer, IEEE has come out with new solution. Started on 2001, IEEE 802.16 working group was developing the IEEE 802.16 standards...
In this paper, we have implemented Multipath routing algorithms for heterogeneous network. Multipath routing separates the traffic among different paths to minimize congestion in terms of multiple alternative paths through a network which can provide a variety of benefits such as minimize delay and congestion, maximize bandwidth, or improved security. We propose a newly improved QoS multipath routing...
Mobile nodes with dual interfaces are not very common and not many studies have been done in this area. In this work, we have done a comprehensive study of dual interfaces on a test-bed to find out the effectiveness of dual interfaces and compared the results with single interface. We have implemented an MIPL based test-bed to study the QoS parameters, which affect mobile nodes, and are considered...
QoS adaptation is an important process in inter-domain service management, since it can guarantee the correct service provisioning when unexpected events occur. However, in inter-domain environments, the human interference and the manual-based operations hamper the deployment of expeditious mechanisms to adapt the QoS of the services. This paper presents an approach based on SOA principles to perform...
Given the growing complexity and energy consumption of customer premises equipment (CPE) in smart home networks and the consequent need for optimal energy usage, there is a need for better coordination of the power operational states of the CPE devices. In particular, this paper presents an energy model to synchronise the behaviour of a Home-Gateway (HG) with the CPE such as a set-top box with exemplar...
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