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Power management technique for determining a device mode of operation

  • US 5,625,882 A
  • Filed: 08/11/1995
  • Issued: 04/29/1997
  • Est. Priority Date: 03/01/1994
  • Status: Expired due to Term
First Claim
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1. In a wireless communication system having a service access point and a plurality of mobile battery powered user devices, said user devices being in communication with each other and/or the access point via communication channels, a power management technique for determining when a user device may transfer from an active mode of operation to a sleep mode of operation, said technique comprising the steps, at the user device, of:

  • initializing a first awake counter, said first awake counter having a maximum count value;

    determining a counter time-out value;

    incrementing the first awake counter during the user device'"'"'s active mode of operation;

    upon counter time-out, determining whether sleep mode conditions are satisfied; and

    when true, entering the sleep mode andsaid technique comprising the steps, at the service access point, of;

    maintaining a second awake counter for each device and selectively resetting and incrementing the second awake counter for a given device in response to respectively receiving a transmission and receiving no transmission from the given device.

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