Multiplex communications – Communication over free space – Signaling for performing battery saving
Patent
1996-12-04
1999-11-23
Hsu, Alpus H.
Multiplex communications
Communication over free space
Signaling for performing battery saving
370318, 370320, 370321, 370324, 370342, 370347, 370349, 370350, 375200, 455 132, 455 134, 455 383, 455343, H04B 7212, H04B 7216, H04J 306, H04J 1302
Patent
active
059912790
ABSTRACT:
A two-way satellite communications system includes an Earth station communicating with a plurality of remote terminals using a network access protocol that facilitates low power consumption by the terminals. The earth station generates forward link TDM packet data transmissions on one or-more satellite channels, and detects, despreads and decodes multiple concurrent return link slotted CDMA packet transmissions on one or more satellite channels. It communicates through a wired connection with a packet processing center which ultimately both delivers return link packet data to end-customers and receives forward link packet data from end-customers. The remote terminals receive, process and act upon forward link TDM transmissions on one or more satellite channels, and generate slotted spread spectrum CDMA transmissions on the return link on one or more satellite channels. The remote terminals communicate with a local digital data source and/or sink, digitize one or more local analog sensor signals, enter into a sleep mode to minimize the terminal's power consumption, and access the satellite communications network in accordance with the system network access protocol.
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Haugli Hans-Christian
Seed William Robert
Hsu Alpus H.
Vistar Telecommunications Inc.
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