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Wireless Body Sensor Networks (WBSNs) have recently gained a lot of research interests due to emerging new applications in health-care, sports and entertainment. As the design of effective network architectures is a key issue to achieve energy-efficient and low-latency communications between the on-body sensors, the 1-hop star and the 2-hop extended star architectures have recently been promoted by...
Cloud computing has emerged to provide infrastructure for cost-effectively hosting applications with dynamically changing demands for computational resources. Dynamic resource allocation in cloud computing is made possible through virtualization technologies. In addition, live migration of services hosted in virtual machines (VMs) among multiple data centers is expected to add more flexibility in...
With ASON network scale enlarging, many ASON networks often meet trouble for fastly setuping a service and restoration even in current ring network. It would be more serious trouble in mesh network. Firstly, the two part main time factor is proposed. Then the current methods are introduced to accelerate the speed for setuping a service. The first method is to keep network topology in every node by...
Doing research on mobile ad hoc network (MANET) security involves several constraints, some of which are wireless environment's attributes, such as bandwidth and delay, and the correctness of network topology. Testing and evaluating using real wireless devices are costly and somehow impractical, so many tools have been developed in order to create media by which researchers can deeply investigate...
In this paper, we introduce the application of topology aggregation in PCE-based WSON network. A wavelength capability matrix was proposed for dealing with the compression of the information about wavelength convertibility. In large scale hierarchical networks, network state information can be effectively compressed by applying topology aggregation and the overhead of communication between PCEs would...
In current cellular networks the rollout of base stations needs to be conscientiously prepared, because their radio configuration should match with the coverage provided by existing cells. The radio planning for every new cell requires considerable human resources. This paper proposes a framework for Dynamic Radio Configuration (DRC) of future Self-Organizing base stations, which is adaptive to the...
In the past few years wireless sensor networks have received a greater interest in application such as disaster management, border protection, combat field reconnaissance and security surveillance. Wireless sensor networks are composed of large number of sensor nodes, which are limited in resources i.e. memory, energy and computation power. Wireless sensor networks (WSNs) facilitate monitoring and...
The increasing growth of the global Internet making the shortcomings of its unstructured topology and distributed routing algorithm are exposed more rapidly. To design a controllable, scalable and manageable backbone network with a simple, efficient architecture is very imperative. Among many topologies, Tree topology which has a natural hierarchical structure and explicit end-to-end transmission...
The disadvantages of the current architectures of the Ad hoc were analyzed. After that, an adaptive hiberarchy of the formation C4ISR system was given. The system based on both the plane architecture and the adaptive hiberarchy was simulated. The control spending of the two architectures were compared under the all kinds of the system scope. The simulation shows that the adaptive hiberarchy is better...
By building a virtual network topology named P2P overlay network on top of internet's physical topology layer based on P2P computing mode, we can effectively build a full-decentralized internet based self-organizing network routing model- Hierarchical Aggregation Self-organizing Network (HASN). The target and architecture of HASN are described in this paper, as well as a detailed description of a...
In this paper, we present the design and the implementation of OSPF-TE routing information collector for MPLS and GMPLS networks. OSPF is commonly used as an IGP in MPLS and GMPLS networks to determine the topology over which LSPs can be established. TE extensions have been recently enabled in OSPF to support SPF tree calculation upon different purposes, thus possibly achieving optimal path computation...
The density of IEEE 802.11 Wireless Local Area Networks, especially in metropolitan areas, has resulted in almost ubiquitous wireless presence in such environments. Apart from the benefits of increased wireless coverage, though, uncontrolled WLAN deployment has brought to attention interference issues among neighbor wireless networks. Combating interference has become one of the keys to successful...
In large multi-domain networks, topology aggregation - besides assuring scalability - has a side-effect as it introduces undesired inaccuracies in the routing information. Such inaccuracy affects the efficiency of routing. In this paper, with the application of a threshold-based aggregation model, the relation between scalability and routing efficiency has been examined by evaluating two different...
For tactical networks, rapid reconfiguration and recovery of network topology is highly required. In this paper, we propose an effective tactical network architecture with WMN(Wireless Mesh Network)-based backbone. To reduce the computational and maintenance complexities of tactical networks, a hierarchical architecture is considered in the proposed architecture. The proposed architecture is called...
Today's Internet is facing many problems which did not take into account in its initial design, such as routing scalability, mobility and security. No matter evolutional or revolutionary solutions that are proposed in recent years, a recognized promising direction is to separate customer network from core network and separate identification from location. In this paper, we sketch out an architecture...
In recent year, ubiquitous computing has gained more attention in academic area. With ubiquitous computing, users can process or get information anytime and anywhere. Fortunately, with the advent of peer-to-peer overlay network, the ubiquitous environment can become scalable with using the peer-to-peer overlay network as the communication middleware. Peer-to-Peer overlay network is an application...
Recent advances in multimedia technologies have led various enhanced multimedia services such as high-quality content-sharing. In particular, in order to deliver and distribute high-quality content effectively, a fiber channel arbitration loop- (FC-AL) based network architecture has been presented, combined with a consumer device, such as a personal video recorder (PVR). Moreover, in order to overcome...
The focus of Wireless sensor networks is how to use limited energy to be able to make the network more effectively. Therefore, energy-saving research has becoming a major focus of recent research, and the network topology control is a part of energy-saving research, We propose that the sensor field be overlaid with a honeycomb virtual mesh based on a tessellation. Based on this cellular structure,...
Network delay is a major design parameter for Networks-on-Chip (NoC)-based applications. Improving NoC delay could be achieved at different design phases. At the system level, we study in this paper the impact of the network topology on NoC system delay using graph-theoretic concepts. A topology-based model is developed to calculate the average NoC delay, which is caused by links and routers. The...
The architecture of the class of routers to implement the modified Fat Tree topology is shown. The router architecture is buffer-less with a simplified routing function. The routing function is obtained from a model that describes the Fat Tree topology and from where the equations governing the routing circuitry are derived. A parameterized router model is developed and coded in verilog. A modified...
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