Method and device for processing undelivered data messages in a two-way wireless communications system

  • US 5,809,428 A
  • Filed: 07/25/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 07/25/1996
  • Status: Expired due to Term
First Claim
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1. A network operations center for transmitting and receiving messages to and from a wireless mobile unit comprising:

  • means for transmitting messages to the mobile unit;

    means for receiving acknowledgment messages from the mobile unit;

    means for determining whether an acknowledgment message is an acknowledgment to a data message or an acknowledgment to a probe message;

    means for transmitting a probe message to the mobile unit if, after transmitting a data message to the mobile unit, no data acknowledgment message is received; and

    means for marking a data message as undelivered and storing the undelivered data message if, after transmitting a probe message to the mobile unit, no probe acknowledgment message is received.

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