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Delivering desired QoS to the applications is one of the most important challenges in next generation networks. Designing efficient queue management in midway nodes leads to improvement in NGN efficiency. This paper presents fair Efficient active Queue Management (EQM) mechanism for congestion avoidance and control in next generation networks. Proposed AQM mechanism uses instantaneous queue length...
Providing wireless service without spatial restriction has been realized due to rapid growth of IEEE 802.11 based wireless technologies. Recently, available bandwidth ("AB") estimation of the wireless medium has received much attention with the widespread use of real-time multimedia applications which requires certain level of QoS (Quality of Service) guarantees. In this paper, we propose...
Tactical data links are an essential contribution to automatic "real-time" communication. In the current tactical environment, most users are pre-allocated a fixed amount of bandwidth. As a result, there should be bandwidth wastes and no guarantee of QoS. If the network is flooded, delaying of important messages may happen. So We need proper network management framework in TDL system. And...
The use of cellular networks for both voice and data communications is growing at a rapid pace throughout the world. Such growth was initially fueled by the need for mobile voice communication. However, with the advent of 2G networks and now with 3G networks, data services are quickly outpacing that of voice. Normally such growth is welcomed since it results in increased revenue for the wireless operator...
Research conducted at Morgan State University (MSU) has proposed a new approach for modeling and managing Quality of Service (QoS) in a cellular and ad-hoc mixed wireless network. This paper focuses on two key areas. It first introduces the “power” performance measure to model and manage the QoS requirements for wireless nodes with time critical applications as a function of the traffic level. It...
The IEEE 802.15.4 is the most widespread used protocol for Wireless Sensor Networks (WSNs) and it is being used as a baseline for several higher layer protocols such as ZigBee, 6LoWPAN or Wireless HART. Its MAC (Medium Access Control) supports both contention-free (CFP, based on the reservation of guaranteed time-slots GTS) and contention based (CAP, ruled by CSMA/CA) access, when operating in beacon-enabled...
The primary concern of broadband wireless technologies is to provide the end-to-end Quality of Service (QoS) for integrated real-time and non real-time applications. The main focus of the IEEE 802.16d/e MAC layer is to manage the radio recourse in an efficient way. The basic functional blocks of the QoS model are addressed by the standards to support five different types of service classes. However,...
This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control scheme for multimedia traffic that exploits vertical handoffs as an effective tool to enhance radio resource management while guaranteeing handoff users' QoS requirements. The network resources utilized by the vertical handoff...
With forward to TCP/IP-based information network development, a large number of innovative communication services quickly emerged. In these data-based communications services, they require different communication rate and variable quality of service. And, the TCP/IP-based network's best-effort feature and statistical multiplexing strategy further makes the service capacity defined in telephone network...
Network monitoring is today not only a process to merely gather information about the network status but also the basic step of further important activities of resource management and optimisation. Many network management processes start from the knowledge of the most up to date load status, and the measurement precision is of uttermost importance for an effective reaction. This paper presents a monitoring...
The goal of this paper is to present an innovative QoS solution of managing resources by knowing the service requests and the network context in a unified network architecture. Considering the nowadays technical solutions and the holistic vision of the future network of information, this solution is proposing a cognitive QoS model of self-managing resources by using the network virtualization concept...
This paper deals with an algorithm of the Satellite Terminal, more precisely, it contributes to the Quality of Service management of the return link, a central problem in satellite network (compared to wire network) due to the satellite delay and the scare uplink resources. Instead of oversizing the connection, which could be very expensive, we aim at reaching an optimal exploitation of uplink resources...
The Context-Aware Broker is a policy-based management system developed by the authors to achieve autonomic communication in delay-tolerant networks. This is in recognition of environment challenges when operating in remote regions, and time, human, and financial resource costs incurred during mission-specific configuration. The Context-Aware Broker seeks to limit cost overheads through achieving a...
In the context of telecommunications networks, the concept of self-organisation implies the introduction of functionalities that lead to the automation of network operational tasks and reduce the need for manual intervention, as well as the provision of DSA mechanisms and enhancement of radio resource management, improvement of QoS and QoE and reduction of OPEX. Based on the definitions of Self-Organising...
Correct estimation of the available bandwidth in overlapped WiFi WLANs environments is one of the essential functions for efficient network resource management and seamless mobile service provisioning of QoS-guaranteed realtime multimedia applications in future Internet. In this paper, we propose a cognitive passive estimation of the available bandwidth (cPEAB) by correct measurements of i) the proportion...
In current wireless networks, channel access is controlled via either a TDMA- or a CSMA-based scheme. While usable in single-hop networks, these techniques are far from optimal and result in significant per-hop and per-packet delay an jitter. This makes multi-hop mesh networks unsuitable for several in-demand applications, including VoIP. We present a new medium access control (MAC) protocol for wireless...
Robustness and reliability are critical issues in network management. To provide resiliency, a popular protection scheme against network failures is the simultaneous routing along multiple disjoint paths. Most previous protection and restoration schemes were designed for all-or-nothing protection and thus, an overkill for data traffic. In this work, we study the Reliable Adaptive Multipath Provisioning...
The scope of this paper is to compare existing techniques proposed to manage real time (RT) communications in wireless sensor networks. MAC, network or cross layer solutions are presented and discussed in order to draw up a global view of system designs. Identifying drawbacks of existing works allows drawing future directions concerning QoS guaranteeing data delivery under time constraints.
Quality of Service (QoS) measurement in large-scale QoS networks is required to be both cost effective and well performed. Common PC-based QoS measurement often suffers from measurement accuracy problems, especially for delay distribution edge (99.9 percentile) measurement. We propose a generic measurement accuracy evaluation method applicable for any delay measurement equipment. Applying this evaluation...
Network Management Systems (NMS) are used to monitor the network and along with Operations Support Systems (OSS) maintain the performance with a focus on guaranteeing sustained QoS to the applications and services. One aspect that is given less importance is the energy consumption of the network elements during the off peak periods. This paper looks at a scenario where the NMS plays an important role...
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