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Based on the application of active networks in congestion control, this paper introduces the traditional congestion control policy and analyses their principles and feasibilities. Active networks congestion control policy introduces the active detection and the passive notification mechanism, the random early detect (RED) queue management and the load balance technology based on the traditional congestion...
Comparing with the IEEE 802.11 DCF mechanism, IEEE 802.11e Enhanced Distributed Coordination Function (EDCF) mechanism has been improved in many aspects for the increasing of the Quality of Service (QoS) in wireless networks. But there are still a few problems to be settled down in IEEE 802.11e EDCF backoff mechanism in which the transmission fairness should be improved further more. In this paper,...
Web Service technologies are becoming increasingly popular for integrating systems and services. Web service composition as an important value-added function provides an application foundation for reusing Web services and automating composition. After brief analysis on the service composition concept and the eliciting process of functional requirements, a strategy of Web service composition based...
Proposed the services composition algorithm based on QoS which combined local strategy and global strategy for constraints. The algorithm eliminates the services with low QoS firstly and then reduces the problem of services composition plan selection for global QoS guarantee to multi-dimension multi-choice 0-1 knapsack problem which is solved by the heuristic method for improving the efficiency of...
Service quality competitiveness is the focus of services quality management under economy globalization. This paper introduces a method based on linguistic approach to evaluate service quality competitiveness. Firstly, a service quality competitiveness evaluation index system is proposed, which is composed of five aspects such as quality stratagem, quality resources, quality capability, customers'...
The handoff prioritization schemes in channel allocation are often carefully scheduled for it is more serious to drop an ongoing call than blocking a new call. In order to let the number of reserved channel for handoff prioritization be compatible with the real time handoff traffic variation in a cluster and seek the balance between the new call blocking probability and the handoff failure probability...
The coupling of signaling protocols for mobility management and resource reservation plays an important role to achieve quality-of-service (QoS) in mobile environments. When performing a handover, request and allocation of resources have to be done in the shortest possible time to avoid disruptions for the user service. In this paper, we analyze the effects of node mobility on the interaction between...
In this paper, we present numerical results to show the performance of power control (PC) by using antenna arrays at the base station (BS). We show that the diversity generated by antenna array, decreases the outage probability, the bit error rate (BER), the fluctuations of the received signal to interference ratio (SIR) over the target SIR, the transmitted power level, and finally increases the speed...
Mobile Ad hoc Network is an emerging research area with practical applications. Due to its fundamental nature, however, a malicious attack may disrupt the route discovery process and significantly affect the Quality of Service delivered by the network In this paper, we introduce a new secure routing protocol, Secure On-demand Source Routing (SOSR), which follows a number of basic techniques of ad...
A new cross-layer urgent bit first (CLUBF) scheduling mechanism is proposed and analyzed in the paper. The proposed algorithm focuses on cross-layer resource allocation scheme for heterogeneous services in orthogonal frequency division multiplexing access (OFDMA) downlink systems. And the CLUBF scheduling mechanism is operated over four steps: (1) traffic mapping: dividing traffic into UB (urgent...
Mobile grid combines mobile computing and grid computing and develops rapidly. This paper aimed at designing a general architecture of mobile grid, illustrated mobile grid architecture design principle, presented a novel architecture, analyzed the mobile grid constitutes and logical structure. After that we discussed mobile grid resource and service management and allocation mechanism from description,...
Web services have become a de facto standard for achieving interoperability among business applications over the Internet. The quality of Web services may be an essential determinant when selecting Web services. From client's perspective, the Performance/Cost Ratio (PCR) is a significant parameter to measure the actual QoS level. Thus it is necessary for the client to derive the PCR when they invoke...
E-government is a power to promote building a service-oriented government. By reference perceptual quality model and SERVQUAL evaluation model, this paper designs the model and the indicator system of E-government service quality evaluation, in order to provide a reference for E-government service evaluation.
With the development of multimedia Web sites and increasingly diversified services, there is a growing demand for different levels of quality of service (QoS) on scalable Web servers to meet changing resource availability and to satisfy different client requirement. Most Web servers in practical use a queuing policy based on the best effort model, which employs the first-come-first-service (FCFS)...
This paper establishes the conceptual model on perception evaluation of tourism E-commerce website, frames a new investigation scale based on WEBQUAL scale and sets up following hypothesis: first, there is a significant difference between the expectation and actual perception (HI); The personal attribute has a significant influence on actual perception(H2);component dimensions of website quality system...
A number of faulty sensors would lead to inaccuracy of event region detection and deterioration of network quality of service in wireless sensor networks. This paper proposed a distributed weighted fault-tolerant algorithm (DWFA) for nodes regular deployment and an optimal fault-tolerant mechanism based on weighted distance (WDOFM) for nodes irregular deployment. Both of them exploit spatial correlations...
IEEE 802.16 standard supports two topologies: Point-to-multipoint (PMP) and Mesh. In this paper, Optimal Base Station Scheduler of IEEE 802.16 Mesh mode is proposed. We propose Optimal Base Station Scheduler (OBSS) that makes scheduling decisions based on the time required of each Mesh Subscriber Station (MSS) and the granting time given to all MSSs in the network. Different services should deal with...
QoS routing has been a very important research issue in mobile ad hoc networks (MANETs). In this paper, we proposes a QoS-Aware routing protocol based on entropy (QARPE) for Mobile Ad Hoc Networks. QARPE can provide stable mutil-path routing strategy. The strategy adhibits the entropy metric to guarantee the stability and QoS conditions of selected routing. The paper adopts the following QoS conditions:...
The QoS routing problem of wireless multimedia sensor networks has great challenging. A notion using routing game and ant colony algorithm to solve this problem is proposed in this paper. A mixed strategy routing game model is proposed too, and proves the routing game has Nash equilibrium. In the routing game, we used the probabilities which are calculated on the basis of the pheromone trails left...
In the current queue scheduling algorithm, there is no the algorithm that completely meets the requirements of PHB in DiffServ networks. Therefore, how to improve the scheduling algorithm aiming at the requirements for different traffic Qos is a problem needing to be handled immediately. Firstly, the existing queue scheduling algorithms supporting DiffServ are researched and compared for performance...
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