Wireless packet data distributed communications system

  • US 5,991,279 A
  • Filed: 12/04/1996
  • Issued: 11/23/1999
  • Est. Priority Date: 12/07/1995
  • Status: Expired due to Term
First Claim
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1. A wireless packet data communications system, comprising:

  • a control station, and a plurality of widely dispersed, remote terminals having an active mode during which they are capable of transmitting and receiving data packets and a sleep mode during which they are inactive, said control station and each of said remote terminals being capable of engaging in packet data communication over a TDM forward link from said control station to said terminals and a slotted multiple access return link from said terminals to said control station,each said remote terminal having an address and being assigned specific timeslots on the forward link during which it may be addressed by said control station, and each said terminal includinga timer operable in said sleep mode to cause said terminal to periodically enter the active mode during its assigned timeslot and listen for incoming data packets from said control station addressed to said terminal, anda processor for interpreting packets received over the forward link, andsaid control station includinga database for storing information pertaining to the timeslots assigned to the various remote terminals,means for transmitting on-demand, data packets addressed to specific terminals in their assigned timeslots on the forward link, andmeans for receiving data packets from the terminals in timeslots on the slotted return link.

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