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Apparatus and method for alerting computer users in a wireless LAN of a service area transition

  • US 5,467,341 A
  • Filed: 04/14/1994
  • Issued: 11/14/1995
  • Est. Priority Date: 04/14/1994
  • Status: Expired due to Term
First Claim
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1. A method for alerting a user of a mobile computer to a deteriorated communication condition between the mobile computer and a computer server linked to the mobile computer over a wireless link, the method comprising the steps of:

  • (1) calculating a packet transmission error rate, said calculating step comprising the steps ofa. transmitting, from the mobile computer to the computer server, a plurality of Link Quality Test (LQT) packets;

    b. receiving the transmitted LQT packets at the computer server;

    c. determining whether an error-free reception of each received LQT packet occurred;

    d. transmitting an acknowledgment packet from the computer server to the mobile computer in response to each error-free reception; and

    e. calculating said packet transmission error rate in the mobile computer as a function of the number of acknowledgment packets received from the computer server;

    (2) comparing the packet transmission error rate in the mobile computer with a threshold value to determine whether the deteriorated communication condition exists, and(3) indicating to the user, responsive to the determination that the packet transmission error rate exceeds the threshold value in said step (2), the deteriorated communication condition.

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