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US 2002/0177441 A1Published application
Frequency search method for a mobile station and a mobile station therewith
AssigneeNtt Docomo, Inc.
InventorsTakehiro Ida, Kazufumi Yunoki, Mitsuo Iwanaga
Life of this patent
Estimating the term…
Abstract
A smaller number of frequencies are dynamically defined, from which a frequency to be used is first searched, failing which, all the frequencies available to a particular mobile communication system are searched, thereby frequency search is efficiently performed with a reduced power consumption.
Claims14
A frequency search method that determines a frequency to be used by a mobile station for communication in a mobile communication system, comprising:
- one or a plurality of subset-frequency search procedures each of which is configured to search the frequency to be used by the mobile station for communication from a subset of frequencies selected, based on predetermined criteria, out of all the frequencies that are allocated for the mobile communications system, each of the procedures being performed in a predetermined priority sequence assigned to each of the procedures until a frequency to be used is determined, and
- an all-frequency search procedure that searches a frequency to be used by the mobile station from all the frequencies that are allocated for the mobile communications system, which is performed when the subset-frequency search procedures for the selected frequencies fail.
A mobile station that searches a frequency to be used for communication in a mobile communication system, comprising:
- subset-frequency search means that searches the frequency to be used by the mobile station for communication from one or a plurality of subsets of frequencies selected, based on predetermined criteria, out of all the frequencies that are allocated for communication of the mobile station in the mobile communications system, each of the subsets of the frequencies selected being scanned in a predetermined priority sequence until a frequency to be used is determined,
- all-frequency search means that searches the frequency to be used by the mobile station from all the frequencies that are allocated for communication of the mobile station in the mobile communications system, and
- first search control means which activates the all-frequency search means when the subset-frequency search means fails in determining the frequency to be used after searching the frequency to be used by scanning the frequencies in the subsets of the frequencies, according to the predetermined priority sequence.
Dependencies are inferred from the claim text.