Method of communication between reduced functionality devices in an IEEE 802.15.4 network
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United States of America Patent
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Feb 3, 2009
Grant Date -
May 4, 2006
app pub date -
Oct 19, 2005
filing date -
Oct 20, 2004
priority date (Note) -
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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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