Method for measuring location of mobile station and for performing handoff using the same in mobile communication system

A method for performing a handoff in a mobile communication system, wherein a mobile station is located in a desired one of 3 sectors in a cell covered by a base station, i.e., an alpha sector, a beta sector, and a gamma sector, however, a strength of a signal from an undesired sector is larger than that from the desired sector due to an obstacle in the desired sector, the method comprising the steps of:

• a) when the mobile station is requested of a pilot strength measurement message (PSMM) from a base station or a handoff is generated, measuring strengths of pilot channel signals of an activated set of base stations and a neighbor list set of base stations in specific areas within each sector of each base station;
• b) transmitting the PSMM to the base station;
• c) comparing the PSMM, in sequence, with strengths of the pilot channel signals from specific areas covered by an activated set of the base stations and a neighbor list set of the base stations which are previously stored in a database;
• d) according to a comparison result acquired from the step c), measuring the location of the mobile station;
• and
• e) disregarding the handoff to the undesired sector, based on the PSMM and the location of the mobile station measured at the step d).

A method for performing a handoff in a mobile communication system, wherein a mobile station is located in an overlapped area where an alpha sector and a beta sector, the beta sector and a gamma sector, or the alpha sector and the gamma sector are overlapped within a base station covering 3 sectors of an alpha sector, a beta sector, and a gamma sector, however, a strength of a signal from an undesired sector is larger than those from the other 2 sectors due to an obstacle in the overlapped area, the method comprising the steps of:

• a) when the mobile station is requested of a pilot strength measurement message (PSMM) from a base station or a handoff is generated, measuring strengths of pilot channel signals of an activated set of base stations and a neighbor list set of base stations in specific areas within each sector of each base station;
• b) transmitting the PSMM to the base station;
• c) comparing the PSMM, in sequence, with strengths of the pilot channel signals from specific areas covered by an activated set of the bas stations and a neighbor list set of the base stations which are previously stored in a database;
• d) according to a comparison result acquired from the step c), measuring the location of the mobile station;
• and
• e) disregarding the handoff to the undesired sector in the overlapped area where two sectors are overlapped, based on the PSMM and the location of the mobile station measured at the step d).