Method of communication between reduced functionality...

Multiplex communications – Communication over free space – Signaling for performing battery saving

Reexamination Certificate

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C455S574000

Reexamination Certificate

active

07486631

ABSTRACT:
In a 802.15.4 network, each reduced functionality device (RFD) is permitted to communicate with only an assigned full function device (FFD). The present invention allows each of the RFDs to communicate with another RFD upon the RFD determining that the local FFD assigned to the RFD is inoperable or unable to communicate. Under emergency conditions, the RFD is able to communicate with a closely located RFDs such that the closely located RFDs can receive and respond to an emergency situation and/or repeat the message. To satisfy the 802.15.4 standards, communication between the RFDs is allowed only during emergency conditions and when the FFD is inoperative. A comprehensive test procedure is included to insure the integrity of the system is preserved at all times.

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“A Multi-Hop Implicit Routing Protocol For Sensor Networks”, Hung-Huan Liu et al., 0-7803-8521, 2004 IEEE, pp. 2946-2950.

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