US 7,321,772 B2
Mobile station, base station, communications system, and communication method
Akihito Morimoto, Tokyo (Japan); Sadayuki Abeta, Tokyo (Japan); and Mamoru Sawahashi, Tokyo (Japan)
Assigned to NTT DoCoMo, Inc., Tokyo (Japan)
Filed on Mar. 05, 2003, as Appl. No. 10/378,900.
Claims priority of application No. P2002-061150 (JP), filed on Mar. 06, 2002.
Prior Publication US 2003/0176192 A1, Sep. 18, 2003
Int. Cl. H04Q 7/28 (2006.01); H04Q 7/20 (2006.01)
U.S. Cl. 455—453  [455/422.1] 3 Claims
OG exemplary drawing
 
1. A mobile station comprising:
a reception unit configured to receive a signal transmitted from a base station;
a calculation unit configured to calculate a ratio of an average reception quality value of a reception quality of the received signal over a first period of time to an average reception quality value of the reception quality of the received signal over a second period of time longer than the first period as a calculated reception quality of the received signal received by the reception unit; and
a selection unit configured to select a communication area to perform communication from a plurality of communication areas where the reception unit can receive the signal, based on the ratio calculated by the calculation unit.