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Modern internet traffic is heavily composed of some form of video communication. In addition, video streaming is slowly replacing regular phone connections. Given that most video transport utilizes Video over Hypertext Transfer Protocol/Transmission Control Protocol (HTTP/TCP), it is important to understand TCP performance in transporting video streams. Recently, multipath transport protocols have...
Wireless sensor and actuator networks (WSANs) are expected to be come fundamental technologies supporting machine-to-machine (M2M) communication and the internet of things (IoT). However, wireless sensors face inherent limitations because they must provide high demand response (DR) despite severely limited battery power. In an effort to achieve both power-saving characteristics in addition to high...
Widespread high-performance mobile stations and wireless communication technologies make it possible to enjoy various network services anywhere at any time. In particular, social network services (SNSs) provide a wide variety of communication among users. We aim to achieve real-space communication that directly integrates information exchange and real-space activity in our daily lives. Therefore,...
As portable information devices with a wireless local area network (LAN) interfaces, such as smartphones and tablet computers, become increasingly widespread, high station density and accompanying severe area throughput degradation are becoming more commonplace. One factor related to this situation is that the initial minimum contention windows size (CWmin) value in current Carrier Sense Multiple...
Development of machine-to-machine communication technologies encourages an increasing amount of mobile traffic by smart phones, cellular phones, and various sensors. This traffic consists of small packets in order to minimize the influence of frame dropping in a data link layer. However, it is necessary to reduce the number of packets flowing into the core network to chunk packets, while satisfying...
Wireless LANs (WLANs) are widely used as network infrastructure due to their ease of deployment and low installation costs. Access points (APs) in WLANs are operated continuously in order to provide connectivity for stations (STAs); however, this wastes a non-negligible amount of energy. To reduce the power consumption of APs in such a WLAN environment, radio-on-demand (ROD) networks were developed...
With the rapid growth of the Internet, deploying energy-efficient networking technology is an urgent matter. In particular, wireless LAN (WLAN), which is widely used due to its ease of deployment and low cost of installation, is also required to be energy efficient. For this purpose, R & D activities for Radio-On-Demand-Networks (ROD) have been proposed. In ROD networks, access points (APs) have...
With the rapid growth in Internet network infrastructure, there is an urgent need to deploy energy-efficient networking technology. In particular, there is a need for energy-efficient wireless local area networks (WLANs), which are widely used due to their ease of deployment and low installation costs. To realize this, radio-on-demand (ROD) have been proposed. Access points (APs) in ROD are equipped...
Multihop wireless networks (MWNs) can dynamically extend the coverage area of wireless local area networks (LANs). Communication performance of MWNs that use a single channel decreases due to interference between nodes occurring when frames are being relayed. In this paper, we proposed an autonomous dynamic transmission scheduling scheme for MWNs that is based on the behavior of neighbor nodes. In...
The widespread deployment of wireless LANs (WLANs) has increased the importance of developing power-saving technologies. We have been involved in the research and development of Radio-On-Demand Networks (ROD) that reduce energy consumption in the operation of WLANs. In this paper, we evaluate the effectiveness of a power-saving scheme with that uses station aggregation for ROD WLANs by simulations...
Mobile Ad-hoc Networks (MANETs) involve the establishment of wireless connections between mobile nodes, and can dynamically extend the coverage area of wireless local area networks (LAN). For MANETs that use a single channel, the communication performance decreases due to interferences between nodes when frames are being relayed. In this paper, we propose a priority control scheme based on neighbor...
There has been widespread deployment of IEEE 802.11 wireless local area networks (LANs) because of high demand from mobile terminals, such as iPod and Android terminals. With the increasing energy consumption of the wireless LANs, the development of power saving technologies incorporated into the wireless LANs have become important. In wireless LANs, access points (APs) continuously consume the power...
The field of mobile data communication has seen very rapid growth with an increased number of mobile terminals connecting to the Internet using the IEEE 802.11 standard for wireless local area network (WLAN). As a result, the amount of energy consumed by WLANs is increasing. To reduce this power consumption, we have proposed a Radio-On-Demand (ROD) WLAN that reduces energy consumption in the operation...
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