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Random access data communication system with slot assignment capability for contending users

  • US 5,303,234 A
  • Filed: 07/15/1992
  • Issued: 04/12/1994
  • Est. Priority Date: 07/15/1991
  • Status: Expired due to Fees
First Claim
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1. A random access communication system comprising:

  • a central station; and

    a plurality of user stations, each of the user stations transmitting a packet to said central station on a randomly selected timeslot of a time-division multiple access channel, the user station defining a plurality of short-duration slots within said selected timeslot and transmitting a burst on one of said short-duration slots,said central station monitoring the defined short-duration slots to detect said burst transmission, assigning as many timeslots as required if more than one burst transmission is detected within a same timeslot, and transmitting a slot assignment signal to said user stations containing a negative acknowledgement of said transmitted packet,said user station from which said packet was transmitted being responsive to said negative acknowledgement for selecting one of the assigned timeslots and retransmitting to said central station a copy of said packet on the selected assigned timeslot,wherein said central station transmits a status signal indicating a status of each of said defined short-duration slots, the packet-sending user station being responsive to said status signal for determining a relative position of the short-duration slot on which the burst was transmitted and selecting one of the assigned timeslots according to the determined position.

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