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Radio data communication system having means for reducing collisions between contending remote stations

  • US 5,377,192 A
  • Filed: 08/07/1992
  • Issued: 12/27/1994
  • Est. Priority Date: 11/13/1990
  • Status: Expired due to Fees
First Claim
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1. A method of communicating data over a radio based communication system between a base station and a plurality of remote stations comprising the steps of transmitting data between the base station and each remote station in a down link comprising one or more down frames of fixed duration;

  • transmitting data between each remote station and the base station in an up link comprising one or more up frames of fixed duration;

    dividing each down frame into a fixed number of down slots at least one of which is a general control slot (GC), at least one other is a down-setup slot (DSU), at least one other is a down transfer slot (DTR), and at least one other is a down acknowledgement slot (ACK);

    providing control data in said general control slot (GC) to identify for each remote station (2) the down-setup slot (DSU) in which the base station (1) is to announce the transmission of data for each remote station;

    identifying in a down-setup slot at least one down-transfer slot (DTR) in which data for each remote station is to be transmitted to each remote station;

    transmitting data in said down-transfer slot to each remote station;

    dividing each up frame into a fixed number of up slots at least one of which is an up-setup slot, at least one other is an up-transfer slot, and at least one other is an acknowledgement slot;

    providing control data in said general control slot to identify for each remote station said up-setup slot;

    dividing the up-setup slot (USU) into a number of sub-slots;

    each remote station (2) wishing to transmit data to the base station (1) transmitting a reservation request in one of said sub-slots;

    the base station (1) responding to each such reservation request from a remote station by identifying in a down acknowledgement slot (ACK) at least one up-transfer slot in which each remote station (2) is to transmit data; and

    each remote station transmitting said data to the base station in said at least one up-transfer slot.

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