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Wireless local area network communications system

  • US 5,276,703 A
  • Filed: 01/13/1992
  • Issued: 01/04/1994
  • Est. Priority Date: 01/13/1992
  • Status: Expired due to Fees
First Claim
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1. A multiple access communications system, comprisingA. one or more hub units,B. a plurality of station units associated with each of said hub units,C. link means for establishing a bidirectional communications link between each of said hub units and its associated station units, said link means including:

  • i) downlink means for establishing a unidirectional downlink radio frequency signal path from each of said hub units to all of its associated station units at a first predetermined frequency,ii) uplink means for establishing a unidirectional uplink radio frequency signal path from each of said station units to its associated hub unit at a second predetermined frequency,iii) synchronization means, selectively operative in a first mode, for establishing a common slotted time frame for each of said hub units and its associated station units, said time frame defining a plurality of time slots, and for allocating subsets of said time slots to each of said associated station units, and selectively operative in a second mode, for allocating sole access to said uplink radio frequency signal path to one of said associated station units, in response to receipt of an access request signal from said one station unit in a time slot included in said subset of time slots allocated to said one station unit,verification means for verifying, within a predetermined number of said time slots the integrity of said bidirectional communications link between each of said hub units and its associated station units, wherein said predetermined number is less than the total number of slots in said time frame.

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