Mobile station positioning system and method in mobile communication system

A mobile station positioning method, wherein a mobile station receives signals synchronized and transferred from at least three neighboring base stations at a predetermined time, wherein the mobile station belongs to one serving base station out of the at least three neighboring base stations, the mobile station positioning method comprising the steps of:

• at specified base stations of the at least three neighboring base stations, increasing transmission power of a specified common channel and reducing transmission power of other channels by more than a transmission power increment;
• at the other base stations excepting the specified base stations, increasing transmission power of the specified common channel and reducing transmission power of other channels by the transmission power increment;
• the serving base station receiving chip sample data of signals of at least three base stations received from the mobile station at a predetermined time;
• calculating arrival time differences between two of the signals using the chip sample data;
• and
• determining a position of the mobile station from the arrival time differences.

A mobile station positioning method, wherein a mobile station receives signals synchronized and transferred from at least three neighboring base stations at a predetermined time, wherein the mobile station belongs to one serving base station out of the at least three neighboring base stations, the mobile station positioning method comprising the steps of:

• at specified base stations of the at least three neighboring base stations, increasing transmission power of a specified common channel and reducing transmission power of other channels by more than a transmission power increment;
• at the other base stations excepting the specified base stations, increasing transmission power of the specified common channel and reducing transmission power of other channels by the transmission power increment;
• the mobile station receiving positioning information of the neighboring base stations from the serving base station;
• receiving and storing chip sample data from the at least three base stations and then calculating arrival time differences between two of the signals using the stored chip sample data;
• and determining a position of the mobile station using the calculated arrival time differences and positioning information of the neighboring base stations.

A mobile station positioning method, wherein a mobile station receives signals synchronized and transferred from at least three neighboring base stations at a predetermined time, wherein the mobile station belongs to one serving base station out of the at least three neighboring base stations, the mobile station positioning method comprising the steps of:

• performing a forward transmission power control at at least one of the at least three neighboring base stations;
• calculating, at the mobile station, arrival time differences between at least two of the signals received from the at least three neighboring base stations;
• transmitting, at the mobile station, the arrival time differences to the serving base station;
• and
• estimating, at the serving base station, a position of the mobile station using the arrival time differences;
• wherein the estimating step comprises the steps of:
• calculating reliability values of the arrival time differences, wherein each of the reliability values is obtained by adding receiving power of two signals used to calculate a corresponding one of the arrival time differences;
• calculating all possible estimated positions (Xn,Yn) obtained from combinations of the arrival time differences and determining weights Rn of the estimated positions, wherein a particular weight Rn is obtained by adding the reliability values of two arrival time differences used to calculate an estimated position;
• and
• calculating a final position (X,Y) of the mobile station using the estimated positions and the weights Rn according to the equation:
• X = ∑ n ⁢ Rn · Xn ∑ n ⁢ Rn ⁢ ⁢ Y = ∑ n ⁢ Rn · Yn ∑ n ⁢ Rn .

A mobile station positioning method, wherein a mobile station receives signals synchronized and transferred from at least three neighboring base stations at a predetermined time, wherein the mobile station belongs to one serving base station out of the at least three neighboring base stations, the mobile station positioning method comprising the steps of:

• performing a forward transmission power control at at least one of the three neighboring base stations;
• transmitting, at the mobile station, chip sample data received from the at least three neighboring base stations during a forward transmission power duration to the serving base station;
• and
• calculating, at the serving base station, arrival time differences between two of the signals using the chip sample data and determining a position of the mobile station from the arrival time differences;
• wherein the position of the mobile station is determined by:
• calculating reliability values of the arrival time differences, wherein each of the reliability values is obtained by adding receiving power of two signals used to calculate a corresponding one of the arrival time differences;
• calculating all possible estimated positions (Xn,Yn) obtained from combinations of the arrival time differences and determining weights Rn of the estimated positions, wherein a particular weight Rn is obtained by adding the reliability values of two arrival time differences used to calculate the estimated position;
• and
• calculating a final position (X,Y) of the mobile station using the estimated positions and weights Rn according to the equation:
• X = ∑ n ⁢ Rn · Xn ∑ n ⁢ Rn ⁢ ⁢ Y = ∑ n ⁢ Rn · Yn ∑ n ⁢ Rn .

A mobile station positioning method, wherein a mobile station receives signals synchronized and transferred from at least three neighboring base stations at a predetermined time, wherein the mobile station belongs to one serving base station out of the at least three neighboring base stations, the mobile station positioning method comprising the steps of:

• transmitting, at the serving base station, positioning information of the neighboring base stations to the mobile station;
• performing a forward transmission power control at at least one of the at least three neighboring base stations;
• and
• calculating, at the mobile station, arrival time differences between two of the signals received from the at least three neighboring base stations and determining a position of the mobile station using the arrival time differences;
• wherein the position of the mobile station is determined by:
• calculating reliability values of the arrival time differences, wherein each of the reliability values is obtained by adding receiving power of two signals used to calculate a corresponding one of the arrival time differences;
• calculating all possible estimated positions (Xn,Yn) obtained from combinations of the arrival time differences and determining weights Rn of the estimated positions, wherein a particular weight Rn is obtained by adding the reliability values of two arrival time differences used to calculate the estimated position;
• and
• calculating a final position (X,Y) of the mobile station using the estimated positions and the weights Rn according to the equation:
• X = ∑ n ⁢ Rn · Xn ∑ n ⁢ Rn ⁢ ⁢ Y = ∑ n ⁢ Rn · Yn ∑ n ⁢ Rn .