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United States Patent | 6,026,299 |
Bamburak ,   et al. | February 15, 2000 |
A powered down communication device locates a wireless service provider in a multi-service provider environment by examining frequency bands while powered down until a frequency band having an acceptable service provider is located. The frequency bands are examined in an order specified by a stored search schedule. An acceptable service provider is identified by comparing the identity of a service provider specified by an identifier received from a band being examined with a list of acceptable service providers. The communication device then registers with the acceptable service provider when powered up.
Inventors: | Bamburak; Michael D. (Columbia, MD); Daly; John J. (Neshanic Station, NJ); Lawrence; Christopher Gregory (Kirkland, WA); Prise; Michael Edward (Kirkland, WA); Raffel; Michael Allen (Redmond, WA) |
Assignee: | AT&T Wireless Services Inc (Kirkland, WA) |
Appl. No.: | 570902 |
Filed: | December 12, 1995 |
Intern'l Class: | H04B 001/00; 551-552; 161.1-161.3; 179.1-180.1; 188.1; 185.1-186.1; 38.3 |
Field of Search: | 455/33.1,33.2,33.4,34.2,54.1,54.2,62,343,422,432,434-435,455,454,516,517,524 379/59,60 |
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