Mobile station, radio communication establishing method and its radio communication system

Abstract

In a mobile station, a radio section is adapted to communicate with a plurality of base stations, and a control section is connected to the radio section. The control section is adapted to search for cells of the base stations to obtain broadcast information of radio signals of the base stations received by the radio section, select a serving cell of a specified one of the base stations and neighbor cells of other ones of the base stations neighbor to the serving cell in accordance with communication qualities of the radio signals of the base stations, and to set the serving cell and the neighbor cells in a communication connection preparing state.

1 . A mobile station comprising:
 a radio section adapted to communicate with a plurality of base stations; and   a control section connected to said radio section, said control section being adapted to
 search for cells of said base stations to obtain broadcast information of radio signals of said base stations received by said radio section; 
 identify a serving cell of one of said base stations and at least one cell of another of said base stations neighboring said serving cell in accordance with the broadcast information of the radio signals of said base stations; and 
   said control section being adapted to select an optimum cell from said cells in accordance with communication qualities of the radio signals of said base stations as measured over time.   
   
   
       2 . A mobile station comprising:
 a radio section adapted to communicate with a plurality of base stations; and   a control section connected to said radio section, said control section being adapted to
 search for cells of said base stations to obtain broadcast information of radio signals of said base stations received by said radio section; 
 identify a serving cell of one of said base stations and at least one cell of another of said base stations neighboring said serving cell in accordance with the broadcast information of the radio signals of said base stations; 
 transmit at least one communication connection request to said serving cell; and 
   said control section being adapted to transmit at least one communication connection request to said at least one neighbor cell upon receiving no response from said serving cell to said communication connection request transmitted thereto.   
   
   
       3 . The mobile station of  claim 1 , wherein said control section is adapted to select the cell with the greatest increase in communication quality measured over time as the optimum cell. 
   
   
       4 . The mobile station of  claim 1 , wherein the control section is adapted to select the cell that does not have the strongest communication quality at the time of selection.