Patents Assigned to AT&T Wireless Srcs. Inc.
  • Patent number: 6195532
    Abstract: A communication device locates a preferable wireless service provider in a multi-service provider environment using a frequency band search schedule. Initially, the communications device registers with a less preferred service provider in a first frequency band. While remaining registered with the less preferred service provider, the device examines several frequency bands in the order specified by the frequency band search schedule. A frequency band is examined by dividing the frequency band into many sub-bands, and by locating the strongest signal above a threshold within the sub-band being examined. The examination continues until a second frequency band having a more preferred service provider is located. The communication device then registers with the more preferred service provider. The category of service provider may be identified and displayed on the communication device.
    Type: Grant
    Filed: June 28, 1996
    Date of Patent: February 27, 2001
    Assignee: AT&T Wireless Srcs. Inc.
    Inventors: Michael D. Bamburak, John J. Daly, Christopher Gregory Lawrence, Michael Edward Prise, Michael Allen Raffel