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Wireless Mesh Networks (WMN) is an essential technology based on mobile ad hoc networks (MANETs). A three sector antenna system applied to WMN was proposed in early 2010, and system performance was analyzed. In this paper, we introduce a real-world three sector antenna system set up in the current WMN test bed in Niigata University, which employs IEEE 802.11 wireless LAN and supports multi-interface...
This paper proposes a link setup method of “SKYMESH,” which is an ad hoc communication system, temporarily established in the sky by balloons holding communication nodes. The SKYMESH can be used as emergency communication systems when telecommunication infrastructure is damaged for large-scale natural disaster. It was reported that a link between balloons was unstable due to swing of balloons. This...
IEEE 802.11 wireless interface supports multiple transmission rates. It is an important problem how to select the transmission rate so that the throughput is maximized. In a wireless mesh network (WMN), nodes are stationary placed in general. The characteristic of each link will not change significantly over relatively long time. It is effective to assign fixed transmission rate which achieves the...
Optical Burst Switching (OBS) has been proposed to realize the next generation Internet on the Wavelength Division Multiplexing (WDM) network technology. Optical Burst Switching is an ultra high speed switching technology for optical fiber networks but has the data burst contention problem. In this paper, we introduce Virtual Path (VP) concept addressing burst contention resolutions in OBS networks...
In a wireless mesh network (WMN) connected to the outer infrastructure such as the Internet, one or more gateways to connect to the outer network as well as surrounding nodes may frequently be congested by concentration of traffic from mobile stations. To resolve the congestion, we propose a new congestion control scheme for layer 3 WMNs. In the proposed scheme, nodes composing WMN backbone (MNs:...
It is well-known as Fitts' law that the time for a user to point a target on a GUI screen can be modeled as a linear function of ldquoindex of difficulty (ID)rdquo. The authors investigate whether the ID formulation is appropriate independently of device screen sizes. Result of our experiment revealed that the ID formulation may not consistently capture actual difficulty: users' pointing performances...
The authors previously found that the index of difficulty (ID) definition in Fitts' model might not consistently capture actual pointing difficulty among target design variations. In this paper, the authors first evaluate the applicability of possible models other than Fitts' one. Multiple regression models are found to be able to appropriately represent the effects of target design variations. The...
An inter-vehicle communication system, called vehicular ad hoc network (VANET), is one of the most promising applications of a mobile ad hoc network (MANET). One of the important issues in VANET is scalability. Compared with topology-based routing protocols, a routing protocol using position information may alleviate the issues of scalability or control overhead. Car navigation systems using a global...
When multiple overlay networks are constructed over the same underlying IP network, overlay paths on different overlay networks may share some links on the IP network. In general, however, because overlay networks do not recognize the existence of each other, they have no consideration on such shared physical links. In this paper, a cooperative routing method for multiple overlay networks is proposed...
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