Communications: electrical – Selective – Having indication or alarm
Reexamination Certificate
2005-07-12
2005-07-12
Zimmerman, Brian (Department: 2635)
Communications: electrical
Selective
Having indication or alarm
C340S007230, C340S539100
Reexamination Certificate
active
06917281
ABSTRACT:
Each of a plurality of wireless communication units (102) is pre-programmed (402) with a plurality of orthogonal codes corresponding to a plurality of canned messages, the plurality of orthogonal codes chosen such that when a group of different canned messages are received simultaneously by a wireless processing device (104), thereby producing an interference symbol pattern, the interference symbol pattern provides a non-zero probability of correctly decoding at least some of the group. A portion of the plurality of wireless communication units then detects (404) a triggering event. Each of the portion selects (406) one of the plurality of canned messages as a selected message to be transmitted in response to the triggering event, and transmits (408) one of the plurality of orthogonal codes corresponding to the selected message during a randomly-selected slotted-aloha time slot.
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Breeden Louis R.
Loppnow Matthew C.
Motorola Inc.
Yang Clara
Zimmerman Brian
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