US 7,577,435 B2
Method and system for mobile communications
Motoshi Tamura, Yokosuka (Japan); Mutsumaru Miki, Yokosuka (Japan); Akiko Okamoto, Kitakyushu (Japan); Kenya Kusunose, Yokosuka (Japan); Akihiro Uchikoshi, Yokosuka (Japan); Daisuke Igarashi, Yokosuka (Japan); Katsuhiko Yamagata, Yokohama (Japan); Takaaki Sato, Yokosuka (Japan); Junichiro Hagiwara, Yokohama (Japan); Yasuyuki Watanabe, Yokosuka (Japan); Takuya Hamajima, Yokosuka (Japan); Masafumi Hata, Yokosuka (Japan); Nobutaka Ishikawa, Yokohama (Japan); Yoshiyuki Yasuda, Yokohama (Japan); Kazufumi Yunoki, Yokosuka (Japan); and Nobuhide Uchiyama, Hiroshima (Japan)
Assigned to NTT Mobile Communications Network, Inc., Tokyo (Japan)
Filed on Apr. 05, 2006, as Appl. No. 11/397,975.
Application 11/397975 is a division of application No. 09/403431, granted, now 7,236,787, previously published as PCT/JP98/01906, filed on Apr. 24, 1998.
Claims priority of application No. 9-123782 (JP), filed on Apr. 24, 1997.
Prior Publication US 2006/0264207 A1, Nov. 23, 2006
Int. Cl. H04Q 7/20 (2006.01)
U.S. Cl. 455—436  [455/439; 455/522; 370/331; 370/328] 2 Claims
OG exemplary drawing
 
1. A method for determining a radio zone and an uplink transmission power, the method comprising:
transmitting, by each of base stations, broadcast information via a corresponding perch channel, the broadcast information indicating a perch channel transmission power level and an uplink interference level; and
receiving, by a mobile station, the broadcast information from near base stations around the mobile station;
detecting, by the mobile station, respective reception levels of the perch channels for the near base stations;
calculating, by the mobile station, respective path losses between the mobile station and respective near base stations on the basis of the respective reception levels and the respective perch channel transmission power levels indicated by the broadcast information;
calculating, by the mobile station, respective necessary uplink transmission power levels between the mobile station and respective near base stations on the basis of the calculated respective path losses, the respective uplink interference levels indicated by the mobile station, the broadcast information, and required signal-to-interference ratios involved in reception by the near base stations;
selecting, by the mobile station, a radio zone in which the necessary uplink transmission power level is minimum among the respective necessary uplink transmission power levels, the base station of the selected radio zone being ready for communication with the mobile station or being able to commence communication with the mobile station after handover; and
controlling, by the mobile station, an uplink transmission power in the selected radio zone based on the necessary uplink transmission power level of the selected radio zone.