無線センサによる患者モニタのコードレス化の検討

概要

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A noble communication algorithms have been proposed, which enables cordless physical monitoring by wireless sensor network. In order to accomplish such monitoring, we have investigated the followings communication algorithms; i) to reduce power dissipation of sensor nodes by making transmission modules into a sleeping state except for transmission phase, ii) to communicate without confusion with multiple sensor nodes by CDMA/CD, and iii) to enlarge communication range with small power wireless communication by a multi-hop communication method. These algorithms have been implemented into an experimental sensor network system consisting of commercially available sensor nodes for evaluation of the communication algorithms. As a result of their evaluations, it was found that power dissipation was reduced to 1/2.5 or working period of two AA alkaline batteries was improved to about 100 hours, that 4 censor nodes could communicate without confusion in the period of 0.5 seconds in the distance of 2m, and that 3-stage multi-hop communications can be accomplished by the delay time of 0.25 second per stage. The proposed algorithms will make a great contribution to realization of practical cordless monitoring system, which can reduce monitoring accidents due to connection cables and mental stress caused by being kept to beds.