US 7,496,383 B2
Mobile communication system and base station control apparatus
Ryosuke Kurata, Yokohama (Japan); Masaaki Yano, Yokohama (Japan); Daiho Kasai, Fujisawa (Japan); and Kenji Yamazaki, Yokohama (Japan)
Assigned to Hitachi Communication Technologies, Ltd., Tokyo (Japan)
Filed on Jan. 31, 2006, as Appl. No. 11/342,884.
Claims priority of application No. 2005-025270 (JP), filed on Feb. 01, 2005.
Prior Publication US 2006/0189308 A1, Aug. 24, 2006
Int. Cl. H04M 1/00 (2006.01)
U.S. Cl. 455—561  [455/442; 370/331] 11 Claims
OG exemplary drawing
 
1. A wireless communication system comprising:
one or plural base stations each of which has one or plural sectors and transmits neighbor sector information including, for each sector, a sector identifier of another sector adjacent to the sector and/or information to identify a radio wave from the another sector, to a wireless terminal for each sector; and
a base station control part which includes a connection history table storing, for each terminal identifier of the wireless terminal and correspondingly to a time, a sector identifier of a sector with which the wireless terminal communicates, and is for changing the neighbor sector information transmitted from the base station, wherein
the base station transmits the terminal identifier acquired from the wireless terminal and the sector identifier of the sector communicating with the wireless terminal to the base station control part,
the base station control part receives the terminal identifier and the sector identifier, and stores the sector identifier into the connection history table correspondingly to the terminal identifier and a reception time,
the base station control part refers to the connection history table, judges that in a case where plural different sector identifiers are stored correspondingly to each terminal identifier in a previously determined time period from an arbitrary time, a first sector and a second sector among the plural different sector identifiers are neighbor sector candidates, and counts the number of times they are judged to be the neighbor sector candidates correspondingly to a first sector identifier of the first sector and a second sector identifier of the second sector, and
the base station control part transmits, with respect to the first and the second sector identifiers in which the counted number of times is a previously determined threshold or more, a change request, which includes the second sector identifier and/or information to identify a radio wave from the second sector and is for changing the neighbor sector information from the base station, to the base station corresponding to the first identifier.