Papers by Keyword: Admission Control

Abstract: Reducing signaling storm in wireless networks has become a major goal in designing today’s wireless communication systems. In order to reduce signaling storm, this paper addresses the issues of scheduling the signaling resources in wireless networks subject to both quality of service (QoS) and priority constraints. The applications in wireless communication systems are divided into three types,namely always-on applications, voice applications and the other applications. For all the applications, an admission control scheme is proposed that incorporates the reconfiguration of idle resources and the QoS negotiation. The QoS negotiation usually contains the following parts, QoS reduction of the new application, QoS reduction of the applications which have accessed to the network and the resources compulsory possession. When the signaling resources are limited, the proposed admission control scheme can improve the successful access rate of voice applications and reduce the impact of signaling storm in wireless network.

Abstract: The problem of admission control caused by the limitation of resource in hotspot beams in satellite system is considered in this paper. Based on the idea of borrowing resources from surrounding beams, we give a scheme that the beam reserve resources is borrowed proportionally. After that, the original admission control algorithm based on service priority is modified in order to protect access rate of the low priority service. Simulation results prove that the proved scheme can increases the available beam load capacity effectively and provide a guarantee for the access of those services with low priority.

Abstract: Owing to its potential to satisfy all outstanding requests for the same data item with a single response, on-demand data broadcast becomes a widely accepted approach to dynamic and scalable wireless information dissemination. In the existing works, clients must wait until the deadline of their requests in the case the requests cannot be satisfied. In this paper, broadcast admission control is introduced to data broadcast systems such that the clients can be informed in advance on the result of admission control for the requests. Furthermore, a matching based allocation scheme is proposed for batch scheduling to maximize data sharing among requests. Simulation results show that our proposed algorithms have better comprehensive performance than traditional algorithms in terms of scheduling, admission control and QoS.

Abstract: This paper presents a method to support real-time data communication over switched Ethernet. The work without modifications in the Ethernet hardware and coexists with TCP/IP suites. Experiment results shows that compared with conventional real-time network protocol, the proposed work has better real-time performances and meets the requirements for industrial control network real-time applications.

Abstract: This paper presents a simple and efficient switched Ethernet communication protocol for industrial hard real-time LAN applications. The network is set up with end nodes and a switch, in small-size industrial network covering such as factory automation, distributed control systems and embedded systems. Compared to some conventional hard real-time network protocols by performing some experiments, the proposed protocol has better real-time performances and meets the requirements of reliability for hard real-time system applications.

Abstract: Internet growth in recent years has encouraged many new applications to be provided for the end user. However, providing and maintaining high quality of service for these new applications is a challenging matter that is getting the attention of many many researchers nowadays. The QoS challenge is emanating from the diversity of these applications, in term of bandwidth requirements and high sensitivity to delay and delay variation. Three main architectures were proposed by IETF in an effort to make the IP QoS a reality. They are integrated services (Intserv), differentiated services (DiffServ) and multiprotocol label switching (MPLS). Sometimes perceived as competitor, these architectures are in fact complementary developments that approach the QoS challenge from different network perspectives. Thus these approaches can work together in a manner that provides a global QoS within Heterogeneous network. This paper aims to propose and discusses an improved admission control mechanism in order to achieve a global QoS in the HN Network. The proposed mechanism uses MPLS-TE tunnels at the core of Heterogeneous networks to maintain QoS for inter-domain flows and applications.

Abstract: Congestion control is a very important problem which can affect network performance directly. However, owing to the lack of steady end-to-end connection and high latency, the traditional congestion control mechanism based on end-to-end feedback is not feasible in DTN. Because obtaining the global information of network is difficult, the congestion control decisions should be made autonomously with local information only. We propose a novel distributed congestion control algorithm based on epidemic routing protocols----MACRE (Message Admission Control based on Rate Estimation). Preliminary experimental results show that this congestion control mechanism can improve the network performance efficiently.