Multiplex communications – Wide area network – Packet switching
Patent
1992-03-05
1995-02-21
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
455 383, 455343, H04J 304
Patent
active
053922875
ABSTRACT:
A system for reducing receiver power consumption in communication system having a transmitter and one or more receivers schedules periodic messages in "slots." Each receiver is assigned a slot during which it monitors the transmissions. The transmitter transmits messages to the receiver only during the assigned slots. The receiver is in an "active state" during its assigned slot. It may remain in the active state after its assigned slot if the message requires the receiver to perform additional actions. During the "inactive state," which is the time period between successive occurrences of its assigned slot, the receiver may perform any action not requiring coordination with the transmitter. It may conserve power during this time by removing power from one or more components such as those used for monitoring the transmissions. At a time during the inactive state shortly before the assigned slot, the receiver applies power to these components and performs initializations. Such initializations may include requiring a pilot channel signal to which the receiver may synchronize itself if its timing signals have drifted out of synchronization with those of the transmitter during the preceding inactive state.
REFERENCES:
patent: 4866709 (1989-09-01), West et al.
patent: 5040172 (1991-08-01), Mano et al.
patent: 5159596 (1992-10-01), Itoh
patent: 5175874 (1992-12-01), Auchter
Geib Kenneth M.
Kerr Richard J.
Tiedemann Jr. Edward G.
Weaver, Jr. Lindsay A.
Miller Russell B.
Olms Douglas W.
Qualcomm Incorporated
Ton Dang
White Katherine W.
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