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How to enhance the network capacity is one of the most important issues. To achieve this, the existing works have focused on improving either the network structure or routing strategies with a common assumption of uniformly distributing the replicas of information among the nodes in the network. The nodes associated with information replicas are considered as source nodes (or server). However, for...
Mobile ad hoc networks (MANET) are collections of self-organizing mobile nodes with dynamic topologies and have no fixed infrastructure. MANET do not have centralized administration, here nodes act as both host as well as router and communicate by forwarding packets for each other in multi hop way, because of the fundamental characteristics like, the open medium, dynamic network topology, lack of...
Recent studies indicate that many communication networks such as the Internet and WWW are scale-free networks. Therefore, the study of routing strategy on a scale-free network is of practical significance, and worthy of further study. In this paper, a new routing strategy with a tunable parameter β is proposed. It is based on the node's delivering ability and queue information of a scale-free network...
This paper proposes multigoal implementations of the Dijkstra's shortest path algorithm and the boundary iterative-deepening depth-first search (BIDDFS). The algorithms were modified to allow for the search of more than one goal in a single expansion pass. The aim of this is to reduce the operational redundancy and hence the time taken for calculating multiple start-goal node pairs. Simulations using...
Networking community is largely depending on simulation to evaluate the performance and behavior of protocols for networks. A network simulator is a program which models the behavior of a network without an actual network being present. Different network simulation tools have been developed during the past years in the field of communication. In this article, present a comparison and simulation study...
OSPFv3 is an interior gateway routing protocol, which is widely used in IPV6 environment. It is the realization of OSPFv2 for IPV4 in the IPV6 environment. They are the same in the basic principles. The paper uses the OPNET network simulation software to simulate and analyze the performance of OSPFv3, and found that both the convergence period is the same roughly, the flow is concentrated in the first...
Routing schemes in Delay Tolerant Networks depend on the intermediate nodes to carry messages till the forwarding of the messages to other nodes or delivery of the messages to their destinations. Thus, efficient and faster spreading of messages is essential to reduce the delay of sending a message from source to destination. In this work, we aim to design a new agent aided routing scheme in Delay...
The single message ferry routing scheme works well in the small scale clustered DTNs (Delay/Disruption Tolerant Networks). However, as the increasing of the network scale, this scheme will lead to high delay. To solve this problem, a hierachical multiple ferries routing scheme (HMFRS) was proposed in this paper. In this scheme, a message ferry and a ferry access point are deployed in each DTN cluster,...
A new 6D mesh/torus (Tofu) interconnect is implemented in the K Computer for achieving a performance of more than 10 petaflops. As expected, among its many interesting properties, such interconnect has large variations of latencies for communications within a node-group (intra-node-group) or between them (inter-node-group). Inspired by their works while recognizing the superior features of the recently...
Bus Net is a kind of wireless network which is consist of buses and bus stations. It has the following features: 1) no end-to-end connection between source and destination, 2) intermittent connectivity, 3) high end-to-end delays. However, unlike the other DTNs, the node's mobility in Bus Net is semi-deterministic, which means the node's line is determined but the arriving time is undetermined. With...
A network traffic system can be tuned by three factors: (i) the topology of underlying infrastructure; (ii) the distribution of traffic resources; (iii) the routing strategy. In this paper, we propose a model to study the optimization of network capacity based on complex network theory. We study the optimization method of network traffic in several situations corresponding to the real cases. The model...
In this paper a BISR architecture for embedded memories is presented. The proposed scheme utilises a multiple bank cache-like memory for repairs. Statistical analysis is used for minimisation of the total resources required to achieve a very high fault coverage. Simulation results show that the proposed BISR scheme is characterised by high efficiency and low area overhead, even for high defect densities...
Networks on chips (NoCs) provide a mechanism for handling complex communications in the next generation of integrated circuits. At the same time, lower yield in nano-technology, makes self repair communication channels a necessity in design of digital systems. This paper proposes a reliable NoC architecture based on specific application mapped onto an NoC. This architecture is capable of recovering...
This paper proposes a fast forward medium access control protocol (FFMAC) for quality-of-service (QoS) guarantee in multihop IEEE 802.11s wireless mesh networks with multiple channels. To the best of our knowledge, the proposed protocol is the first one which considers the multihop and multichannel issues simultaneously. It provides higher priority for real-time applications, while remaining the distributed...
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