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Reducing delay in setting up calls

  • US 7,092,721 B2
  • Filed: 07/20/2004
  • Issued: 08/15/2006
  • Est. Priority Date: 07/20/2004
  • Status: Expired due to Fees
First Claim
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1. A method for reducing delay associated with a call set-up for a call between an originating communication unit and a target communication unit in a radio access system (RAS), the method comprising:

  • initiating the call between the originating communication unit and the target communication unit prior to a channel assignment;

    estimating a first latency between an initiation time associated with the call and a first time when the target communication unit is capable of receiving a notification of the call by comparing the first time with a wake-up time for the target communication unit using a time value associated with the RAS and a slot offset time associated with the target communication unit;

    estimating a second latency between the initiation time and a second time when the target communication unit is capable of receiving the notification of the call by comparing the second time with the wake-up time for the target communication unit using the time value associated with the RAS and the slot offset time associated with the target communication unit; and

    sending an address associated with the target communication unit to the RAS on one of a first channel and a second channel based on the first latency and the second latency.

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