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Data processing system

  • US 9,541,627 B2
  • Filed: 10/09/2013
  • Issued: 01/10/2017
  • Est. Priority Date: 10/12/2012
  • Status: Active Grant
First Claim
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1. A data processing system comprising:

  • a communication terminal; and

    at least one or more distribution apparatuses configured to distribute a wireless signal to the communication terminal;

    wherein each of the at least one or more distribution apparatuses distributes a wireless signal that contains position data that indicates a position of the distribution apparatus;

    wherein the communication terminal stores beforehand in the communication terminal a predetermined threshold value with respect to a signal strength of a wireless signal distributed by a distribution apparatus, compares the predetermined threshold value and a signal strength of one wireless signal that is distributed from a first distribution apparatus among the at least one or more distribution apparatuses, and has a determination unit that determines that position data obtained from a relative position measuring method is indicative of a current position of the communication terminal when the strength of the one wireless signal is below the predetermined threshold value; and

    determines that position data received from the first distribution apparatus is indicative of the current position of the communication terminal when (i) 2 or more wireless signals containing position data are consecutively received from the first distribution apparatus, and (ii) when the signal strengths of the 2 or more wireless signals are above the predetermined threshold value.

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