Device and method of estimating location of terminal using sequences transmitted from base stations

A location estimating method used in a terminal, the method comprising:

• receiving, at the terminal, a location estimation request from a serving base station;
• receiving, at the terminal, unique sequences transmitted from adjacent base stations;
• transmitting, in response to the location estimation request, information related to a mixture of the received unique sequences from the terminal to the serving base station;
• and
• estimating, at the serving base station, a location of the terminal based on the transmission
• power of each adjacent base station with respect to each of the unique sequences, wherein
• the unique sequences are generated using a constant amplitude zero auto-correlation (CAZAC) code, an m-sequence, or an orthogonal code.

A location estimating method used in a terminal, the method comprising:

• receiving, at the terminal, unique sequences transmitted from at least two base stations;
• extracting, at the terminal, components respectively corresponding to the at least two base stations from a mixture of the unique sequences received by the terminal;
• and
• estimating, at the terminal, a location of the terminal based on the components respectively corresponding to the base stations and the transmission power of each base station with respect to each of the unique sequences, wherein
• the unique sequences are generated using a constant amplitude zero auto-correlation (CAZAC) code, an m-sequence, or an orthogonal code.

A non-transitory computer-readable storage medium storing a program to perform a location estimating method in a serving base station, comprising instructions to cause a computer to:

• receive, at the serving base station, information related to a mixture of unique sequences received by a terminal and transmitted from adjacent base stations;
• extract, at the serving base station, components respectively corresponding to the adjacent base stations from the mixture of the unique sequences received by the terminal;
• and
• estimate, at the serving base station, a location of the terminal based on the components respectively corresponding to the adjacent base stations and the transmission power of each adjacent base station with respect to each of the unique sequences, wherein
• the unique sequences are generated using a constant amplitude zero auto-correlation (CAZAC) code, an m-sequence, or an orthogonal code.

A location estimating device used in a serving base station, the device comprising:

• a receiving unit to receive, at the serving base station, information related to a mixture of unique sequences received by a terminal and transmitted from adjacent base stations;
• an extracting unit to extract, at the serving base station, components respectively corresponding to the adjacent base stations from the mixture of the unique sequences received by the terminal;
• and
• an estimating unit to estimate, at the serving base station, a location of the terminal based on the components respectively corresponding to the adjacent base stations and the transmission power of each adjacent base station with respect to each of the unique sequences, wherein
• the unique sequences are generated using a constant amplitude zero auto-correlation (CAZAC) code, an m-sequence, or an orthogonal code.