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Whether individual objects such as enemy tanks or intruders have been reliably detected typically depends on the number of data reports successfully delivered to a sink node from the sensor nodes surrounding the object. When the number of data reports exceeds a required threshold, the sink recognizes the object that is detected by sensor nodes. Thus, previous studies exploited this framework for reliable...
Vehicular Sensor Networks (VSNs) are merging for supporting communications between roadside sensor nodes and vehicles on for notifying environment events on roads to drivers and passengers. Geographic routing has been considered as an efficient and scalable approach to send sensing data from sensor nodes to vehicles. Fundamentally, geographic routing requires sensor nodes to be aware of the location...
In wireless sensor networks, sink mobility support is one of the essential functionality in many applications. With continuous advancement, the future applications will require not only sink mobility but also high performance. Multipath routing is one of the promising technologies for improving network performance. However, existing multipath routing protocols have not dealt with the sink mobility...
The adoption of multi-hop wireless networks has received attention from industrial cyber-physical system. In industrial applications, real-time multicasting is widely used for controlling and monitoring machines. In multi-hop wireless networks, the end-to-end delay depends on the end-to-end distance. Existing real-time multicasting studies use a fixed distance limitation to achieving real-time transmission...
The real-time data dissemination is based on a minimum delivery speed of each hop on the end-to-end shortest distance in order to ensure to reach the destination within the desired time deadline in hop-by-hop fashion. In other words, the schemes depend not only on single hop-delay, but also on the distance between the source and destination. However, the performance of the real-time data dissemination...
Communications for mobile sink groups such as rescue teams or platoons bring about a new challenging issue for handling mobility in wireless sensor networks. Recently, a group region-based approach has been proposed to send data to a mobile sink group. However, it uses flooding for discovering and notifying group region information and flooding or long distance forwarding for disseminating data. Thus,...
Disjoint multipath routing is an attractive approach for improving the reliability of data delivery in wireless sensor networks. Recently, the issue for maintaining the robustness and efficiency of the disjoint multipath routing against network failures such as network holes are being studied. Several protocols have been proposed to handle the network failures. However, they cause the large performance...
In wireless sensor networks, the existing real-time routing protocols for stationary sinks exploit a spatiotemporal approach, utilizing the delivery speed based on the end-to-end distance to fulfill the desired time deadline. This approach cannot be directly applied to a mobile sink since the distance can be varied depending on its movement. That is, the delivery speed cannot be determined without...
In wireless sensor networks (WSNs), real-time service is one of the important issues. Typically, existing studies for the service are relied on beacons. Recently, beaconless routing has been proposed to overcome control overhead for resource constrained environment of WSNs. Thus, real-time communication based on the beaconless scheme could give great advantages with less energy consumption. To do...
In this paper, we propose an opportunistic real-time data dissemination protocol in order to solve the transmission failure problem in error-prone WSNs. Retransmission is well-known for recovery of transmission failure, however, this may cause the severe time delay possibly to violate the real-time requirement. To solve the problem, our protocol exploits both broadcasting nature and temporal opportunity...
Distributed geographic multicast protocols are efficient and scalable for wireless sensor networks but could not be applied to beaconless routing. We propose a novel distributed multicast protocol based on beaconless routing without exchanging beacon messages.
This paper studies on data dissemination for mobile sink groups in wireless sensor networks. A mobile sink group denotes a set of tightly coupled mobile sinks for team collaborations such as a team of firefighters and a group of soldiers. This mobile sink group has a collective movement feature. That is, even though sinks in a group randomly move in their own personal spaces, they collectively move...
To support a group of mobile sinks in wireless sensor networks, region-based routing protocols by using a single entity nature have been proposed. They periodically register the region location information of the mobile sink group and exploit flooding for the data delivery within the region. However, they have a data delivery failure problem for some sinks due to the asynchrony between the registered...
In order to disseminate data to a mobile sink by location-based routing, it is important to provide location information of the sink altering continuously with a source in wireless sensor networks. Fundamentally, it could send directly location information message to a source whenever the sink moves. On the other hand, some schemes without additional cost for location update are proposed recently...
In order to find a completely disjointed multiple routes, traditional multipath strategies try to get global topology information by using frequent flooding or end-to-end signaling. It is very useful, but too much expensive to directly adapt to the resource constrained wireless sensor networks. Thus, recently there has been proposed an energy-efficient localized multipath scheme (EDM), which exploits...
The real-time data dissemination schemes exploit the spatiotemporal communication approach which forwards data at the delivery speed calculated with the desired time deadline and the end-to-end distance in wireless sensor networks (WSNs). However, the schemes do not focus on the reliable communication. Recently, MMSPEED is a well-known scheme for both reliable and real-time data delivery based on...
In wireless sensor networks (WSNs), the real-time data dissemination protocols exploit the spatiotemporal communication approach which forwards data at the delivery speed calculated with the desired time deadline and the end-to-end distance. However, the protocols do not focus on the reliable communication. Recently, MMSPEED is proposed for both reliable and real-time data delivery based on multipath...
Geographic multipath routing is one of the most appropriate approaches which can improve the end-to-end reliability via multiple paths for the wireless sensor networks that have frequent network dynamics such as both node and link failures. It has been focused on how to construct a node-disjoint multipath that an intermediate node should be belonged by only a single path. It is because that if two...
The mobility model of a mobile sink group typically consists of two movement behaviors as follows: a micro-level movement behavior and a macro-level one. In the micro-level, mobile sinks randomly move within a geographically restricted region while all the member sinks in the macro level collectively and slowly move together toward with similar direction. Recently, a group communication protocol has...
In wireless sensor networks (WSNs), the studies that support sink mobility without location information of sensor nodes traditionally establish a cluster-based virtual infrastructure. The cluster-based infrastructure consists of clusters involving sensor nodes and a shared tree organized by the cluster heads. In the studies, data dissemination from a source node to a mobile sink is performed via the...
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