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One-Way Delay Variation (OWDV) has become increasingly of interest to evaluate network state and service quality, especially for real-time and streaming services such as VoIP and video. Measurement of these parameters needs to be performed with the layout infrastructure. Many schemes for OWD measurements require clock synchronization at the source and destination through Global-Positioning System...
Broadcast transmission is an effective way to disseminate safety-related information for cooperative driving in intervehicle communication (IVC). However, it is fraught with fundamental challenges such as message redundancy, link unreliability, hidden terminals, and broadcast storms, which greatly degrade network performance. In this paper, we introduce a cross-layer approach to design an efficient...
TCP, the facto standard used in today's Internet, has been found to perform poorly in Mobile Ad Hoc Networks (MANETs). This is exacerbated by contention with increasing UDP-based high priority multimedia traffic and the class differentiation introduced in current QoS protocols, which results into TCP starvation and increased spurious timeouts. In this paper, we propose a cross-layer TCP enhancement...
Explicit congestion notification (ECN) is a mechanism that can be used to provide early indication of impending Internet congestion, and as such can be used to reduce the latency and improve the throughput of applications using the Internet. This paper examines the impact of using ECN with quality of service classification for Internet paths that include a satellite delay. Specifically, it provides...
This paper describes a hierarchical wireless network architecture for real time remote coordination and monitoring in distributed applications. The problem of defining a communication architecture keeping in view the constraints imposed by control and monitoring tasks requires a co-design approach. The present framework takes into account the available infrastructure to satisfy the requirements of...
Multiview video is well known to involve interactions with audience and offer better view experience than conventional single-view video. The interactive nature of multiview video has made the service very delay-sensitive and thus imposes great challenges for providing multiview streaming service in Internet. Currently, almost none of existing works have addressed the delay issue in multiview streaming...
Future application areas of wireless sensor networks (WSNs) may include industrial process automation, aircraft control systems or patient monitoring in hospitals. Such applications require predictable quality of service in terms of message transfer delay and reliability. Performance of WSN data transport is to a large extent defined by the employed medium access control (MAC) protocol. Currently,...
Wireless mesh networks (WMNs) have recently gained a lot of popularity due to their rapid deployment and instant communication capabilities. However, as a key technology for next-generation wireless networking, WMNs lack suitable routing metrics and protocol for new features. Currently, AODV is the routing protocol used in WMNs. This paper proposes an ants-in-mesh (AIM) routing protocol for wireless...
The task of finding and sustaining routes in mobile ad-hoc networks (MANETS) is an important factor in determining the efficiency of any MANET protocol. MANET characteristically comprises of wireless mobile hosts whose communication with each other is devoid of any fixed infrastructure. Absence of fixed infrastructures and host mobility thus constitute frequent unpredictable topological views. Positional...
DoD migration to Service Oriented Architectures (SOA) enriches warfighter information access and, in so doing, intensifies the need for related real-time applications distributed across large geographic areas with highly mobile users and sensors. Such applications require exchange of critical, time-sensitive data among local as well as distant users across resource constrained networks, and as such...
The presence of delay-sensitive traffic in QoS-aware MANETs (mobile ad-hoc networks) results into increased TCP spurious timeouts, thus wasting their scarce bandwidth. Furthermore, the different dynamics used by a routing protocol in discovering and maintaining routes have a significant impact on TCP and MANETs in general. In this paper, we investigate the combined effect of contention- induced spurious...
Providing high quality communications service among mobile wireless devices is basically a challenging task in wireless ad hoc networks. In this paper, we propose a route stability based multipath quality of service (QoS) routing (SMQR) protocol for mobile ad hoc networks (MANETs) to support throughput and delay sensitive real-time applications in MANETs. Reliability of QoS-aware path is improved...
Time and frequency alignment is critical for ensuring QoS for applications such as voice, real-time video, wireless hand-off, and data over a converged access medium. To satisfy the accuracy of time synchronization, propagation delay measurement is required between time-sensitive devices. There is existing network technology for time synchronization, such as network time protocol (NTP), IEEE 1588...
Against the problems existing in the Internet-based control systems, we propose a method for implementing such systems using RON technology. RON is a virtual network constructed on the application-layer of the ISO-Internet model. And it is able to select the optimum transmission strategy according to service quality factors, which will solve the problems caused by time-varying delay and minimum bandwidth...
This paper introduces a novel QoS differentiation framework for OBS networks. Two different methods are provided and subsequently validated. Particularly, both proposals aim at using controlled loops as deflection routes, which assures an upper bounded number of hops from source to destination. This yields a twofold outcome. First, the insufficient offset time problematic of standard deflection routing...
In the context of networks providing QoS guarantees, the end-to-end delay experienced by a packet is an important parameter. In this paper, we show that network coding can be used to decrease worst case end-to-end bounds when compared to a classical routing strategy. This result can be explained by the fact that network coding can cope with congestion better that classical routing due to its property...
There is growing evidence that a new generation of potentially high-revenue applications requiring quality of service (QoS) guarantee are emerging. Current methods of QoS provisioning have scalability concerns and cannot guarantee end-to-end delay. For a theoretical fluid model, we derive four distributed rate and delay controls accounting for their bandwidth and end-to-end delay requirements while...
Online gaming is a member of the real time interactive multimedia services. This service suffers from all impairments on the networking layer that increase the latency, respectively the responsiveness. The quality of service (QoS) of online gaming is becoming an important issue due to a massive increase of online games (Half-life, War-craft) with a significant player community. The purpose of this...
A distinguishing feature of the universal mobile telecommunications system (UMTS) is the support of different levels of quality of service (QoS) as required by subscribers and their applications. To provide QoS, the UMTS backbone network needs an efficient QoS mechanism to provide the demanded level of services on UMTS network. A model to investigate end-to-end quality of service (QoS) provisioning...
Unreliable failure detectors have been an important abstraction to build dependable communication applications over iSCSI storage systems subject to faults. Their implementations are commonly based on timeouts to ensure iSCSI processes termination. However, for systems built on the Internet, it is hard to estimate this time value because traffic variations. In order to increase the quality of service...
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