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In this paper, we propose a new intersection-based geographical routing protocol, called delay tolerant routing protocol (DTRP) that adapts to the changes in the local topology within city environments. DTRP is based on an effective selection of road intersections through which a packet must pass to reach the gateway to the Internet. The selection, in such delay tolerant VANETs, is made in a way that...
IEEE 802.16 supports both single-hop and multi-hop mesh modes. It defines several traffic and service categories and offers differentiated quality of service (QoS) through scheduling algorithms. In IEEE 802.16, a three-way handshaking mechanism is given to reserve the slots hop-by-hop for mesh networks, which is called Hop-by-hop Bandwidth Reservation Protocol (HBRP). However, HBRP can not assure...
Dynamic, flexible and programmable network nodes will enable the key infrastructure for the Future Internet. Reengineering of the traditional router architectures is required in order to allow hardware- and vendor-independent routing functions and to design open and cost-effective service platforms. This paper presents a modular programmable router architecture to support multi-granular routing based...
Recently, there has been a tremendous growth in the number of installed distributed computing platforms such as those for content distribution networks, cloud computing infrastructures, and distributed data centers. Such distributed platforms need a scalable end-to-end (e2e) network monitoring component to provide Quality of Service (QoS) guarantees to the services and improve the overall performance...
Overlay multicast is an effective approach to the problem of streaming distribution. Other approaches proposed for streaming, i.e., unicast transmission and IP multicast have several drawbacks. The former method is not scalable with the growing number of users. The latter method - IP multicast - requires strong cooperation with ISPs (Internet Service Providers) what is not always realizable due to...
The area of mobile ad hoc networking has gained widespread interest of the network research community in recent years because of the ability of the MANETs to provide truly distributed and decentralized communication facility on ad hoc basis. But due to the bandwidth constrained links and limited transmission range of the mobile nodes, MANETs suffer from the inability to cover a wider network area...
Users using the same video streaming service within a wireless network share the same limited backbone bandwidth to the Internet. These users are motivated to collaborate with each other to obtain better-quality service. The decisions and actions of users influence the performance of others, hence they form a social network. In a fully-distributed wireless network, malicious attack can cause much...
This paper discusses the QoS topology control problem with consideration of power control and rate adaptation in wireless mesh networks. Our task is to construct a routing forest (a set of trees rooted from the gateway nodes), configure the transmission power of each node, such that the constructed network topology can meet the delivery threshold for all nodes and the system throughput is maximized...
The spatial correlation among the images retrieved from distributed video sensors leads to considerable data redundancy, thus resulting in significant performance degradation in energy efficiency and QoS satisfaction. In this paper, a correlation-aware QoS routing algorithm (CAQR) is proposed to efficiently deliver visual information under QoS constraints by exploiting the correlation among video...
Admission and rate control are key components for providing QoS (Quality of Service) flows in multi- rate wireless ad hoc networks where transmission rate at the physical layer is adapted dynamically according to the channel condition. Key to these controls is the formulation of a rate constraint that can regulate the flow rate passing through each node. This paper formulates a cross-layer rate constraint...
The NP-hard QoS Multicast Routing (QoSMR) is one of the most challenging problems in recent networks. In this paper, we investigate the QoSMR problem as well as its different existing formulations. We analyze the limitations of these formulations and propose a novel one. The main advantage of our formulation is that it considers not only the quality of the multicast subgraph formed by the computed...
The demanding requirements of new real-time and mobile multimedia group-based applications (e.g. IPTV and video-conferencing) motivates the research for novel and efficient network architectures, able to fulfil service requirements and increase user experience. Multicast, despite its scalability issues, is the most suitable network technology for the delivery of multiparty content. Context-awareness...
Collision Sense Multiple Access (CSMA) has been preferred to Time Division Multiple Access (TDMA) as medium access scheme for Wireless Multimedia Sensor Network (WMSN) in the scenarios where the traffic is bursty in nature and multiple consecutive and contiguous packets generated from the same collision neighborhood need to be sent. Protocols based on nonuniform probability distribution do not perform...
The provisioning of energy-efficient, reliable and low-delay communication in Underwater Sensor Networks (USNs) is a challenging research issue due to the use of acoustic channels. However, the existing mechanisms for enhancement of energy utilization and Quality-of-Service (QoS) in USNs have not considered noise attenuation in deep water which can deteriorate energy efficiency and QoS seriously....
In order to evaluate performance of mobile networks, it is necessary to consider the occurrence of random failures causing performance degradation and the consequent repair actions. This approach is especially suitable for next generation networks based on the Third Generation Partnership Project (3GPP) IP Multimedia Subsystem (IMS), as a consequence of the very high Quality of Service levels required...
Low cost and low power Wireless Sensor Networks (WSN) with transmit-only nodes are attracting more attention due to their advantages in achieving a good balance of cost, fine-grained sensing and differentiated service for data collection applications. This work addresses the reliability and performance issues of a single-hop hybrid WSN with both transmit-only nodes and standard nodes and proposes...
The peer-to-peer paradigm shows the potential to provide the same functionality and quality like client/server based systems, but with much lower costs. However, the resources, e.g. storage space, CPU power and online time, provided by the peers are unreliable due to churn. In order to enable churn resistant reliable services using the resources in p2p systems, we propose in this paper a distributed...
The efficiency of Bit Torrent in disseminating content has inspired a number of P2P protocols for on-demand video streaming (VoD). Prior work on adapting Bit Torrent to VoD mainly focused on the piece selection policy, since streaming requires a somewhat "in order" download progress. Conversely, not much effort has been spent into adapting Bit Torrent's peer selection policy, where nodes...
Behavior analysis and modeling of network services is an important tool in helping to successfully manage network services. In this paper, we propose the methods to depict the behavior of P2P service. With the accurate behavior description, we can gain the exact service with high QoS guarantee. Using this algebra, designers can prove key aspects about the behavior of a proposed set of Internet services...
In recent years, the concept of autonomicity has been proposed to solve the complexity issues of the network and reduce the manual intervention. The self-* properties of the autonomic network, such as self-configuration, self-healing, self-optimizing and self-management, enable the network to adapt to the heterogeneous and complex network environments. On the other hand, with the rapidly growing demand...
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