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Ubiquitous computing environments are becoming more heterogeneous and highly dynamic. Systems need to dynamically self-adapt in order to accommodate dynamically changing resources, needs of different users and failure events. This paper focuses on the runtime adaptation mechanisms that need to be dealt with the distributed nature of systems and the heterogeneity of the environment. We tackle the problem...
Recent research efforts claim that dynamic per-class network resource over-provisioning is promising, since aggregated over-reservations allow to significantly reduce state, processing and signaling overheads. However, over-reservation must be carefully controlled to prevent waste of resources, which can be introduced by residual bandwidth (over-reserved but unused) of each Class of Service (CoS)...
Real-Time applications generate both streaming and best-effort traffics. The on-chip interconnection network for these applications must be able to guarantee Quality of Service "QoS" for streaming traffic and no packet loss for best-effort traffic. In order to efficiently handle both streaming and best-effort traffic, we propose in this paper a hybrid network on chip architecture, which...
In SOA, Reputation-Based Trust (RBT) mechanism is applied to achieve trust management. RBT enables services to assess the trust level of other services based on the reputation accumulated from user recommendations. A key challenge to apply RBT is to prevent the strategic behavior of users when they provide recommendations - they might give unfair ratings to benefit themselves. In this paper, we propose...
Compared to other wired networks, complexity in the 3G UMTS is due its interactions with different entities. Within the UMTS, services have to deal with a great number of different QoS, small user display, variant bandwidth and small battery power. Most of the services are generally bind to the particular systems or APIs. In this article, we look at the evolution of different technologies on which...
Next Generation Networks (NGNs) transport a variety of services across a converged IP-based network infrastructure. To assure the Quality of Experience (QoE) for the users, an end-to-end Quality of Service (QoS) management is required. While solutions for QoS management and admission control in access and core networks exist, the inclusion of the home network remains still open. Thus, we present a...
Normal design practice is to decouple the design of applications using a network from the design of the network itself. Designers optimize network performance by only focusing on network transport layer mechanisms for robustness (connectivity), efficiency (throughput), & speed of service (latency). Applications offer loads to the network and rely on the QoS function in the network to prioritize...
In face of the markets growing around community-centric services and applications telecommunication companies adapt their products to new technology landscapes. We investigate the possibilities of network operators to contribute to the quality of a service that enables real-time user interactions for hypertext user interfaces. The central quality criterion considered here is the latency in browser-based...
Telecommunications Network Management Systems ( TNMSs) have had to respond to enormous change, as telecommunication networks have changed from the early (digital) timeframe of being ISDN based, (devoted dominantly to voice), to the current timeframe, providing diverse services of data, voice, video, along with a very different business environment. The goal of this paper is to understand the probable...
Preemption is a common approach for QoS provisioning in multiservice and multiuser networks where the network resources are exhausted. This paper focuses on the analysis of the lightweight algorithms for the UPnP QoS Architecture where the decision about preemption is made by computation power limited home gateway. Based on the data obtained, the comparison of the proposed algorithms shows that the...
Voice over IP (VoIP) is a widely recognized killer application of the Internet and it has been integrated within many services (for instance to enrich the on-line gaming experience). In addition, such feature is often natively supported by mobile devices equipped with IEEE 802.11-based communications, or by standard UMTS (Universal Mobile Telecommunication System) cellular phones. Nevertheless, Beyond...
Expectation and requirements for future wireless communication systems continue to grow and evolve. Thus, 3GPP has considered LTE/SAE to ensure its competitiveness in the future. In LTE/SAE, one of the recurring problems is dimensioning and testing. Modeling is an effective way to solve the problem because model is easy to generate test scenarios and inexpensive in changing test configurations and...
This thesis puts forward an innovative model of health management service grid, and gives the overall architecture of health management grid platform system by which a health management service model can be established based on the analysis of present condition of health management in China. This paper also presents a new integrated model about the health management service resources by using the...
Due to the advance in Wireless technology, ubiquitous Internet access, and improvements to mobile device technology, mobile services flourishe considerably and will continue to do so as the number of mobile users begins to multiply. However, this range of published mobile services introduces a new challenging problem, in addition to the diversity of discovery protocols and the heterogeneity of interaction...
NGNs are being envisioned to circumvent the ossification of current Internet and leverage advanced and profitable services. It is still unclear how this will be realized, but network infrastructure virtualization continues to gain momentum as an elegant solution to accommodate concurrent NGNs in a flexible, robust fashion. Despite this trend and the fact that the Internet will continue to grow as...
This paper proposes a peer-to-peer video streaming delivery system within the framework of next generation networks using application level multicast. Increased efficiency and reliability is achieved in two ways. First, the system uses path diversity by splitting the video traffic in several stripes and distributing each stripe via different multicast trees. Second, the proposed architecture lies...
Group applications like the audioconference require a minimum level of quality of service for the adequate transmission of voice packets and the improvement of the signaling processes for joining, maintaining and leaving multicast groups. Traditionally, SIP servers have dealed with unicast signaling and have also been supported by IP multicast facilities described within the SDP payload information...
Wireless networks will certainly run applications with strict QoS requirements and so, micro-mobility protocols such as fast hierarchical mobile IPv6 (FHMIP) are useful tools to accomplish this new feature. The FHMIP is an effective scheme to reduce Mobile IPv6 handover disruption, however it does not support application's QoS requirements. Therefore, in order to provide QoS guarantees for real-time...
The pervasive computing field is almost always addressed from application, middleware, sensing or human computer interaction perspective. Thus, solutions are usually designed at application level or involve developing new hardware. Although current layered network architectures (mainly TCP/IP stack) have enabled internetworking of lots of different devices and services, they are neither well-suited...
With the increasing size and complexity of emerging military communication networks, low footprint emulation methods are required to evaluate protocols, algorithms and user performance. In this paper we describe a new emulation architecture that is scalable, modular, and responds to real-time changes in topology and link characteristics. We use this scalable emulation testbed to evaluate system performance...
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