Potential wireless technologies in mobile communications

Ohtsuka, Hiroyuki; Oono, T.; Kondo, Yoshihisa; Nakamura, Osamu; Tanaka, Toshiaki

doi:10.1109/icc.1999.765465

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…In current systems, high-speed data communication is difficult, and the bandwidth is not guaranteed. However, by applying the AO/DI concept to wireless, diverse services can be provided while maintaining a high frequency utilization rate [4][5][6]. Therefore, we report on a study of the implementation of this wireless AO/DI system.…”

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confidence: 99%

Proposal and performance evaluation of wireless AO/DS system employing PHS

Shibata

Uehara

Kubota

2005

Electron. Comm. Jpn. Pt. I

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SUMMARYThe Always On/Dynamic ISDN (AO/DI) system adaptively switches between packet switching and circuit switching in response to the traffic volume. In this paper, we propose a wireless AO/DI system based on the Personal Handyphone System (PHS), present an overview of this system, and perform an evaluation by a computer simulation of the channel occupation ratio and the call loss ratio of the system. The traffic model assumes an application such as WWW or electronic mail, and the performance is evaluated. The results show the effectiveness of the wireless AO/DI technology as the subscriber capacity of the entire system increases. Furthermore, the middleware for the wireless AO/DI and the terminal adapter for the wireless AO/DI are tested. The performance evaluation results of actual equipment are presented.

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confidence: 99%

Proposal and performance evaluation of wireless AO/DS system employing PHS

Shibata

Uehara

Kubota

2005

Electron. Comm. Jpn. Pt. I

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A wireless agent for autonomous file synchronization in a mobile environment

Fukushima

Takahashi

Nishikawa

et al.

Proceedings of the 2005 International Conference on Active Media Technology, 2005. (AMT 2005).

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This paper describes a wireless agent that contributes to the realization of pervasive computing. More concretely, we present a method that manages the file synchronization in a mobile environment. Our wireless agent resides at a mobile client, and automatically completes the file synchronization with the serve while users move through communication service areas. It has the following features: First, to deal with the instability unavoidable in a highly mobile communication, the connection time is predicted based OR the average and standard deviation of RF signal strength to determine the optimal timing for attempting connection. Secondly, based on the predicted connection time and due times of files, it determines the file for synchronization in an optimal manner. Thirdly, by maintaining the metadata, it guarantees the consistent synchronization even under several sudden disconnections. We show the experimental results to demonstrate the usefulness and effectiveness of our wireless agent. INTRODUCTIONAdvances in mobile communication and pervasive computing technologies rouse our expectation toward the ubiquitous information service at anytime and anywhere. Actually, the improvement and prevalence of wireless and broadband communication infrastructure and mobile terminals such as PDA is quite prominent.However, there remain many problems to be solved to make the mobile information service that of high affinity to our daily life. Those range from the hardware dimension such as the compact and durable batteries to the service dimension such as the sustainable business model for mobile information service.In this paper, we focus on the middteware dimension that bridges over the infrastructure, i.e., RF signal, and the application software.Our goal is to enable the automatic information service in a passing-through environment: While we are moving through areas where a wireless communication service is provided.The instability of communication is ineluctable in a mobile environment. There exist various disturbances at the RF signal that hinders the stable communication, sometimes causing even abrupt and sudden disconnections. In spite of such adverse situation, users want the data in need to be synchronized at the earliest occasion, or at least before a certain due time.This paper describes a wireless agent that automates the establishment of the connection by evaluating the stability of RF signal, and that is equipped also with the metadata management capability to guarantee the completion of data synchronization task even under several abrupt and sudden disconnections. We also show a method that determines what file is to be synchronized first among several candidates, considering the stability of communication and the due time to complete the file synchronization.In different terms, if we register the file to be sent or received to the wireless agent, it takes care of all necessary steps for its synchronization in an optimal manner.We also show the experimental results in a practical situation: File synchronizatio...

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Potential wireless technologies in mobile communications

Cited by 2 publications

References 2 publications

Proposal and performance evaluation of wireless AO/DS system employing PHS

Proposal and performance evaluation of wireless AO/DS system employing PHS

A wireless agent for autonomous file synchronization in a mobile environment

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