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Method and apparatus for reducing current consumption

  • US 6,330,234 B1
  • Filed: 04/27/2000
  • Issued: 12/11/2001
  • Est. Priority Date: 04/27/2000
  • Status: Expired due to Term
First Claim
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1. A method of reducing current consumption in a mobile communication unit having an oscillator driving a first pseudorandom code generator, wherein the mobile communication unit is adapted to communicate with a base station having a second pseudorandom code generator, the method comprising the steps of:

  • storing a first state of the first pseudorandom code generator that is substantially synchronized to the second pseudorandom code generator at a first time;

    entering a sleep mode for a predetermined period of time during which the oscillator and the first pseudorandom code generator are stopped;

    entering an awake mode wherein the oscillator and the first pseudorandom code generator are started;

    calculating a second state of the first pseudorandom code generator that is substantially synchronized to the second pseudorandom code generator at a second time, wherein the second state of the first pseudorandom code generator is calculated based on the first state of the first pseudorandom code generator;

    determining an estimated error between the second state of the first pseudorandom code generator and a state of the second pseudorandom code generator at the second time; and

    searching a range of pseudorandom noise (PN) states dependent on the estimated error between the second state of the first pseudorandom code generator and the state of the second pseudorandom code generator at the second time to synchronize the first pseudorandom code generator to the second pseudorandom code generator.

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