Apparatus and methods for cellular communication

Details Apparatus and methods for cellular communication Apparatus and methods for cellular communication

2005-11-01

2005-11-01

Horabik, Michael (Department: 2635)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572800, C340S870030, C455S574000, C370S311000

Reexamination Certificate

active

06960999

ABSTRACT:
A tag interrogation system including at least one base station and a plurality of tags, each having an awake mode and a sleeping mode, wherein each base station is operative to broadcast messages which are received by the plurality of tags and has a receiving window during which it is operative to receive messages sent by individual tags from among the plurality of tags, and wherein at least some of the messages broadcast by at least some of the base stations include an indication of the time at which a future receiving window is due to open, thereby to allow tags to conserve power by remaining in the sleeping mode until the future receiving window opens.

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