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In opportunistic networks, messages are delivered based on a store-forward-carry paradigm. Network topology varies with time and dynamism of the links between nodes has a primary effect on the message delay, one of the network performance indicators. To get a precise estimation of the network latency with less complexity, a rigorous framework modeling the information propagation process is developed...
The wireless sensor network routing strategies determine the lifetime and the energy consumption of the sensor networks. An algorithm on calculating the approximate maximum network lifetime is presented by establishing the wireless sensor network routing strategy planning model. Through the simulation, the amount of information acquired during the network lifetime could account for 98.2% of the maximum...
The communication efficiency represents one of the key aspects in the future smart grid. Indeed, as the power distribution grid is being extended to fulfill increasing power demand population, recent advanced wireless communication standards and updates in the architecture of the distribution network have been introduced to upgrade the efficiency of data transmission and quality of service, enabling...
Routing is one of the most challenging aspects in Delay Tolerant Networks (DTN) because the end-to-end path does not always occur. In wildlife tracking, habitat monitoring, and other scenarios, the network area may be divided into some geographical communities, the nodes only move in their communities. In this paper, for this specific community-based DTN, we address the delivery delay of the epidemic...
After analyzing GPSR under traffic scenarios, we find its poor performance dues to extremely uneven distribution of vehicles. Considering the characteristics of the traffic scenario, we propose Improved GPSR using an electronic map. The simulation results show that Improved GPSR performs better than GPSR on Packet Delivery Ratio. Furthermore, we study the effect of stations switching on Packet Delivery...
This paper studies optimal relay-based multicast routing to improve throughput in multirate-aware MANETs. The main idea is trying to replace a lower rate transmission of upstream node with some higher rate transmissions by relay nodes to minimize the total transmission time of the upstream node and relay nodes. Firstly, we formulate this problem as an optimization problem and prove that it is NP-hard...
The resource-constrained nodes in wireless sensor networks (WSNs) are prone to failures, especially due to battery depletion. Well-defined effective metrics to identify the potential vulnerability in advance are essential for failure prevention. We propose a novel and advantageous metric called Battery Index to predict energy-vulnerable nodes at the very early stage of the network lifetime. Enabled...
A fundamental design challenge in energy-constrained wireless sensor networks is to maximise the operational time. With increasing node density and multi-hop communications, disproportion on traffic intensity and congestion level among nodes leads to uneven battery consumption and thus the existence of failure-prone nodes. Common fault-tolerant schemes focus on routing strategies although the effectiveness...
A new, deadlock-free, fully adaptive routing algorithm is proposed for worm hole-switched 3-dimensional tori with only two virtual channels. The deadlock avoidance technique is presented based on a new virtual network partitioning scheme. Unlike the previous virtual network partitioning schemes, the new method allows all virtual networks to share some common virtual channels. A new virtual channel...
A new deadlock-free fully adaptive routing algorithm is proposed for 2-dimensional tori with only two virtual channels. The deadlock avoidance technique is presented based on a new virtual network partitioning scheme. Unlike the previous virtual network partitioning schemes, the new method allows all virtual networks to share some common virtual channels. Two virtual channels should be the lower bound...
This paper presents the design, implementation and evaluation of a solution for dynamic redirection of traffic flows for multihomed mobile networks. The solution was developed for a mobile user that disposes of a Personal Area Network (PAN) with a Personal Mobile Router (PMR), in order to achieve Always Best Connected (ABC) service by distributing flows belonging to different applications among the...
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