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Virtual real-time clock based on time information from multiple communication systems

  • US 7,551,129 B2
  • Filed: 10/27/2006
  • Issued: 06/23/2009
  • Est. Priority Date: 03/27/2003
  • Status: Expired due to Term
First Claim
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1. A method for determining a position of a receiver unit in a wireless communication system, comprising:

  • obtaining absolute time from a first communication system for a first time instant;

    receiving relative time information from a second communication system;

    obtaining internal timing information from a local clock;

    estimating absolute time at a second time instant based on the absolute time for the first time instant, the relative time information from the second communication system, and the internal timing information; and

    determining the position of the receiver unit based at least in part on the absolute time estimate for the second time instant.

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