| US 7,542,766 B2 | ||
| Mobile communication system, compressed-mode controlling method for the same system, and base and mobile stations in the same system | ||
| Yutaka Kobayashi, Kawasaki (Japan); Makoto Uchishima, Kawasaki (Japan); and Natsuhiko Nakayauchi, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Aug. 24, 2005, as Appl. No. 11/211,042. | ||
| Claims priority of application No. 2005-157019 (JP), filed on May 30, 2005. | ||
| Prior Publication US 2006/0270408 A1, Nov. 30, 2006 | ||
| Int. Cl. H04W 36/00 (2009.01) | ||
| U.S. Cl. 455—440 [455/443; 455/436; 455/444; 455/437; 455/438; 455/439; 455/441; 455/442; 370/230; 370/230.1; 370/231; 370/232; 370/233; 370/234; 370/235; 370/247] | 10 Claims |
| 1. A mobile station in a mobile communication system which includes a plurality of base stations and a mobile station communicable
with the plurality of base stations, in which mobile communication system a compressed mode can be activated before conducting
a hand over, said mobile station comprising:
a mobile station side distance measuring unit which measures the distance between the mobile station and at least one of the
plurality of base stations which is currently in communication with the mobile station by propagation delay amount or a GPS;
a mobile station side comparing unit which compares the distance measured by the mobile station side distance measuring unit
with a threshold value;
a compressed-mode activation prohibiting control information generating unit which generates compressed-mode activation prohibiting
control information for prohibiting the activation of the compressed mode if the distance measured by the mobile station side
distance measuring unit is smaller than the threshold value as a result of comparison by the mobile station side comparing
unit in communication environments including a communication environment where an actual reception level is lower than a theoretical
recetion level corresponding to the distance represented by the threshold value; and
a compressed-mode activation prohibiting control information sending unit which sends the compressed-mode activation prohibiting
control information generated by said compressed-mode activation prohibiting control information generating unit to the base
station which is in communication with the mobile station.
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