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Delivering multimedia streaming on Internet remains several limitations, such as bandwidth fluctuations and network conjunction. We present a multimedia gateway design including dynamic bandwidth estimation, SVC extractor and buffer management to resolve the limitations. The dynamic bandwidth estimation not only selects the appropriate SVC sub-stream, but also measures the change of bandwidth and...
This paper studies the problem of the real-time communication in the on-line monitoring system, which achieves the on-line monitoring of B / S mode through the ActiveX controls and network programming technology based on the TCP / IP protocol. This paper proposes an improved congestion control algorithm grounded on the one-way delay (CCAOD), using the value and the change trendency of the one-way...
Management is a critical issue in optical networks. Highly impacting in management, routing in optical networks, is often decoupled into both the path selection and the wavelength assignment problems. In the former, shortest path based approaches are often applied to compute paths. Although such approaches offer advantages in terms of network loading, they are restricted by the fact, that routes are...
Switching a communication path from one access point (AP) to another in inter-domain WLANs is a critical challenge for delay-sensitive applications such as voice over IP (VoIP) because communication quality during handoff (HO) is more likely to be deteriorated. To maintain VoIP quality during HO, we need to solve many problems. In particular, in bi-directional communication such as VoIP, an AP becomes...
This paper describes initial research in addressing the challenges of managing quality of information for wireless sensor network target tracking with multiple missions of various priorities tracking multiple targets. We address the use of a distributed market-based mechanism to equalize the information value loss (that itself is a function of quality of information (QoI)) of tracked targets across...
When measuring the performance of MPEG-4 transmission in IEEE 802.15.3 WPAN, the drop scheme used can have a considerable influence on Mean Propagation Time, Job Failure Rate and composite metrics. Active Queue Management (AQM) is an effective method to provide an early notification of network congestion by pro-actively dropping or marking packets. In this paper, we analyze the performance of MPEG-4...
Channel detection is necessary for control of channel usage in multi-user and multi-channel wireless networks. In this paper, we propose a real time wireless channel detection method based on measuring fluctuations of packet arrival intervals in networks using IEEE802.11 media access protocol. We have used simulations to show the relationship between the congestion on wireless channels and fluctuation...
The inter-domain resource exchange (iREX) architecture uses economic market mechanisms to automate the deployment of end to end (E2E) inter-domain (ID) quality of service (QoS) policy among resource consumer and resource provider Internet Service Providers (ISPs). Previous simulation results have shown that iREX allows more coexisting ID policy deployments with less network congestion when compared...
The Department of Defense will deploy the first generation of future force communications networks and battle command systems over the next several years. These future force systems will have the ability to characterize and meter their offered traffic based on priority using quality of service architectures such as differentiated services and integrated services. This implementation of quality of...
Explicit congestion notification (ECN) and active queue management (AQM) Schemes such as random early detection (RED), adaptive random early detection (ARED) and BLUE queues have been proposed for TCP/IP networks to compensate network congestion. However, using ECN requires that ECN be supported by both TCP senders and receivers. This paper presents a novel AQM modification called receiver- window...
We provide a game theoretic formulation for a sensor activation problem in a multi-attribute environment. Activated sensors randomly select one of M environmental attributes, and transmit data on that attribute to an end user. The goal is to maximize the number of attributes reported while minimizing redundant reports and packet collisions, which both increase with the number of active sensors. Sensor...
With TCP the network congestion is controlled by adjusting the transmission rate through congestion window (cwnd). The cwnd either increases or decreases depending on ACKs (acknowledgements), which reflect the status of link's buffer queues. This TCP dynamics has been modelled mathematically with various queue management principle of the link. However, the existing results are mostly average dynamic...
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