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Method of measuring round trip time and proximity checking method using the same

  • US 20070192480A1
  • Filed: 01/27/2006
  • Published: 08/16/2007
  • Est. Priority Date: 02/23/2005
  • Status: Active Grant
First Claim
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1. A method of measuring round trip time (RTT), the method comprising:

  • transmitting a hashed second random number from a first device;

    starting an RTT measurement when the hashed second random number is transmitted;

    receiving a hashed first random number from a second device which received the hashed second random number; and

    ending the RTT measurement when the hashed first random number is received.

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