Experimental Evaluation Of A
Telecommunications Network Along
Railway Lines By Ad Hoc Network Technology
Author(s)
K. Seki
Abstract
There are some cases when we would like to construct tentative communications
systems easily along railway lines even if they cannot fully guarantee to satisfy
transmission qualities. For example, we need to grasp situations of disasters or
accidents which have happened at the place where not enough transmission
bandwidths are secured or the transmission system itself has been damaged. Ad
hoc network technologies are a candidate for constructing such tentative
networks. Their standardizations are in progress and some commercial products
are emerging. We carried out an experiment using commercial products which
implemented a standardized protocol and constructed a network by wireless
LAN, and confirmed that the network was easily constructed but frame loss rates
and time to change routes when devices broke were insufficient for some cases.
We, therefore, tentatively made telecommunications nodes which used both
wired LAN and wireless LAN. We confirmed that a satisfying performance was
obtained until about three wireless hops even if only wireless LAN was used,
and transmissions continued even when a cable or the node was damaged.
Keywords: ad hoc network, image transmission.
1 Introduction
Railway telecommunications systems, such as train radio, are important
infrastructures which support train operations. After they are minutely designed
in order to satisfy requirements such as coverage areas and quality of services,
fixed equipments such as wireless base stations, exchanges, and wired
transmission lines which connect between them are installed. The systems can,
therefore, maintain the required transmission qualities for a long time once they
Keywords
ad hoc network, image transmission.
Related Book
Other papers in this volume
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