Cell selection method and mobile station

• US 8,583,113 B2
• Filed: 12/06/2010
• Issued: 11/12/2013
• Est. Priority Date: 11/16/2007
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Iwamura, Mikio, Nakamura, Takehiro
• Primary Examiner(s): Mehrpour, Melody
• Application Number:
  US12/961,205
• Publication Number:
  US 20110092204A1
• Time in Patent Office: 1,072 Days
• Field of Search: 455/436, 455/434, 455/550.1, 455/435.2, 455/437, 455/422.1, 455/453, 455/3.01, 455/438, 455/439, 455/561, 455/562.1, 370/328, 370/344
• US Class Current: 455/434
• CPC Class Codes: H04W 48/06 based on traffic conditions
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 60/04 using triggered events

Abstract

A cell selection method includes steps of: (A) determining, at a mobile station (UE), whether or not a first CSG cell satisfies a predetermined condition, when using a first macro cell as a camped cell; and (B) changing, at the mobile station (UE), the camped cell from the first macro cell to a first CSG cell, when determined that the first CSG cell satisfies the predetermined condition.

Claims

1. A cell selection method in which a mobile station selects a camped cell among one or more specific cell(s) selectable as a camped cell only by a specific mobile station and one or more general cell(s) selectable as a camped cell by any mobile station, the cell selection method comprising steps of:

changing, at the mobile station, the camped cell from a first general cell to a second specific cell, when using the first general cell as the camped cell, when having detected no general cell that satisfies second radio quality, and when having detected the second specific cell that does not regard the mobile station as the specific mobile station and satisfies third radio quality.

2. A mobile station configured to select a camped cell among one or more specific cell(s) selectable as a camped cell only by a specific mobile station and one or more general cell(s) selectable as a camped cell by any mobile station, the mobile station comprising:

a cell selector unit configured to change the camped cell from a first general cell to a second specific cell, when the mobile station uses the first general cell as the camped cell, when the mobile station has detected no general cell that satisfies second radio quality, and when the mobile station has detected the second specific cell that does not regard the mobile station as the specific mobile station and satisfies third radio quality.