Wyniki wyszukiwania - Biblioteka Nauki

1

Autonomous Navigation Control of UAV Using Wireless Smart Meter Devices

100%

Ueda K. , Miyoshi T.

Journal of Telecommunications and Information Technology

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2019

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tom nr 2

64--72

EN

In preparation for the upcoming home delivery services that rely on Unmanned Aerial Vehicles (UAVs), we developed a new multi-hop radio network that is laid over a smart meter network transferring electric energy information only. In this network, a UAV follows, for navigation purposes, the topology of a virtual network overlaid on the physical smart meter network. We established a service management control method which does not rely on image analysis or map information processing, i.e. processes that consume precious power resources of the UAV. Instead, navigation is based on the routing technology. The current distance between the UAV and a node of the smart meter network is measured by means of the radio transmission loss value, therefore determining the position of the UAV. A two-layer network model has been proposed. One layer consists of a network of nodes in a residential area with scattered buildings – a location that is safer to navigate – while the other is an access network of nodes in a densely populated area. Then, we proposed methods to determine the direction of movement towards the next hop node on the data-link layer and the end node on the network layer, which is the target destination. We implemented a software-based test system and veriﬁed the eﬀectiveness of the proposed methods.

2

Adaptive Load Balancing Ad Hoc Routing Scheme Inspired by True Slime Mold

80%

Katada H. , Yamazaki T. , Miyoshi T.

Journal of Telecommunications and Information Technology

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2019

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tom nr 1

14--22

EN

Engineering neo-biomimetics, i.e. imitation models based on body structures and behavior of living organisms, relied upon to solve complex problems, have been studied in various ﬁelds. In distributed networks, such as ad-hoc networks and wireless sensor networks, the behavior of a variety of true slime molds which are capable of constructing multipath ﬂow networks based on the amount of body, has been studied. Ad hoc networks only consist of mobile terminals (nodes) that can relay packets along an established route. However, link relations and the available bandwidth of the nodes change dynamically due to the mobility of nodes. In addition, the speed of communication between nodes also varies due to node positions and their communication-related quality. Thus, practical use of ad-hoc networks still remains an issue, because it is diﬃcult to establish stable routes under such environments. This study aims to propose an adaptive load balancing routing technique that adaptively diversiﬁes the transmission paths based on the available bandwidth, residual battery life, and the data transmission volume, by applying a mathematical model of slime mold routing, known as the physarum solver. We conﬁrm the eﬀectiveness of its adaptive behavior in dynamic environments using computer simulations.

3

A P2P-based Communication Framework for Geo-Location Oriented Networks

80%

Miyoshi T. , Shimomura Y. , Fourmaux O.

Journal of Telecommunications and Information Technology

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2019

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tom nr 1

58--66

EN

This paper proposes a novel peer-to-peer communication framework to implement geographical location oriented networks, called G-LocON. Location-based services have been gaining in popularity, as proven by ridesharing and mobile games. Although these services have to construct geolocation oriented networks based on their users’ geographical locations, they completely rely on client/server models to communicate with neighboring terminals. G-LocON provides geolocation oriented device-to-device communication only with the current wireless technologies, such as LTE and Wi-Fi, cooperating with the global positioning system and peer-to-peer overlay networking. G-LocON will serve as a type of a mobile ad-hoc network in which devices located within the focusing area are capable of communicating directly. We developed a primitive Android application to implement the GLocON framework. Evaluation of the solution’s performance has veriﬁed the usefulness of the proposed system that oﬀers an admissive transmission delay. Moreover, to conﬁrm the application-related potential of the G-LocON framework, we also show a practical map software in which all neighboring mobile devices present in the focusing area are displayed.

4

LoCO: Local Cooperative Data Oﬄoading System Based on Location Information

70%

Yamazaki T. , Asano K. , Arai S. , Shimomura Y. , Miyoshi T.

Journal of Telecommunications and Information Technology

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2019

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tom nr 1

67--75

EN

The development of high speed mobile networks and the widespread use of smartphones have enabled users to easily obtain large data volumes via the Internet. This causes a heavy consumption of network resources, a burden on the available bandwidth. To solve such problems, a data oﬄoading method with a wireless LAN access point has been used to distribute traﬃc from mobile to ﬁxed networks. However, the method using wireless LAN access points can only change the communication paths but cannot reduce the overall traﬃc. This paper proposes a local cooperative data ofﬂoading system (LoCO) that reduces the overall traﬃc by sharing data, with direct communication between neighbors based on their location-related information. Moreover, the authors implemented the LoCO system on Android smartphones and clariﬁed its performance in comparison with a traditional client/server system through experiments to download data in a real-world environment.