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Delay-Tolerant Networks are wireless networks where disconnections may occur frequently due to node mobility, power outages and propagation phenomena. In order to achieve date delivery, store-and-forward protocols are used in DTN and routing protocols based on epidemic message dissemination has been proposed, such as Epidemic routing. Under Epidemic(More)
We propose an enhanced Probabilistic Routing Protocol which using History of Encounter and Transitivity (E-PROPHET) routing protocol. The E-PROPHET introduces the contact frequency and contact duration into the routing protocols, which makes sure the message be forwarding to accurate next hop. Results of simulation indicate that the E-PROPHET saves the(More)
Although doppler ultrasound is now routinely applied to the detection of fetal heart rate (FHR) for the assessment of perinatal fetal well-being, it is unsuitable for long-term at-home monitoring due to its transmission of ultrasound beam directly to the fetal heart and the requirement of frequent repositioning the ultrasound probe. As a non-invasive(More)
Energy consumption is rising sharply due to the large deployment of the Home Base Stations (HeNBs) by subscribers, it not only brings the cost burden to operators, but also brings the pollution to the environment. Now the energy efficiency (EE) researches on HeNB are based on the algorithms about the adaptive power or the spectrum utilization, rarely(More)
In order to overcome the phenomenon that the existence of end-to-end path is no longer guaranteed because of intermittent connection in the opportunistic network, it is desirable to employ a special node called ferry, which moves in a specific trace and forwards data for disconnected nodes, to provide communication opportunities. In this paper, Global Ferry(More)
Delay-Tolerant Networks are wireless networks with no existing infrastructure, where disconnections between nodes may occur frequently due to node mobility and power outages. In order to achieve data delivery, store-and-forward protocols are used in DTN. Thus routing protocols based on epidemic message dissemination has been proposed, such as Epidemic(More)
In opportunistic networks, network topology constantly changes and instantaneous end-to-end paths are not available, nodes have narrow transmission ranges, limited storage space and energy. Lately, the consideration of social characteristics provides a new vision in the design of routing protocols and many routing protocols have been proposed to overcome(More)
In delay tolerant networks (DTN), flooding mechanism in epidemic routing protocol may waste network resources. Based on introducing and analyzing routing protocols in DTN, this paper proposes an improved protocol of epidemic routing (EPI-HT) .EPI-HT forwards messages accurately to the next-hop according to historical information between nodes and node(More)
Opportunistic networks are the emerging networks featured by partitions, long disconnections, and topology instability, where the message propagation depends on the cooperation of nodes to fulfill a “store-carry-and-forward” fashion. But due to constrained energy and buffer, some nodes may behave selfishly, which will involve damage to the(More)