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Remote initiated messaging apparatus and method in a two way wireless data communications network

  • US 5,734,963 A
  • Filed: 06/06/1995
  • Issued: 03/31/1998
  • Est. Priority Date: 06/06/1995
  • Status: Expired due to Fees
First Claim
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1. A method of operating a communications system to provide ubiquitous wireless data communication services between a plurality of remote field units each capable of initiating, on their own, a field unit initiated inbound message to a message operations center (MOC), by using a network of widely distributed radio base stations (RBSs) and multiple paging systems, the method comprising the steps of:

  • A. at the MOC site,i. polling the RBSs to determine radio frequencies which are presently suitable for any of the plurality of field units to send a field unit initiated inbound message to one or more of the RBS sites;

    ii. determining available frequencies and times which any of the plurality of field units may send a field unit initiated inbound message;

    iii. formatting the available frequencies and times into an outbound data message;

    iv. forwarding the outbound data message to each of the paging systems;

    B. at each of the paging system sites, transmitting the outbound data message to the field units;

    C. at each of the field units,i. receiving the outbound data message;

    ii. determining if a field unit initiated inbound message is required to be sent, and if so,a) selecting one of the available frequencies and times from the received outbound data message;

    b) encoding the data to be sent to the MOC in the form of a short duration burst message, to minimize the probability of interfering with existing broadcast or other communications at frequencies near the selected available frequency;

    c) at the selected available frequency and time, transmitting the field unit initiated inbound message;

    D. at the RBS sites,i. receiving field unit initiated inbound messages from the field units; and

    ii. forwarding the field unit initiated inbound messages to the MOC.

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