Frequency control device, frequency control method, and base transceiver station

A base transceiver station comprising:

• an antenna to receive signals transmitted from mobile stations;
• an amplifier to amplify the signals received through the antenna;
• a frequency conversion circuit to compensate for frequency deviations generated from amplified signals and to convert the amplified signals into signals having second frequencies;
• a demodulator to demodulate the signals outputted from the frequency conversion unit;
• and
• a baseband processing circuit to decode data included in the demodulated signals and to output the decoded data to a core network,
• wherein the frequency conversion circuit includes:
• a first detecting circuit to detect each of frequency deviations generated from each of signals transmitted from each of mobile stations, respectively;
• a second detecting circuit to acquire classification information about at least one of location, moving speed and moving direction of each of the mobile stations;
• a classifying circuit to classify each of the mobile stations into groups based on the classification information;
• a first calculating circuit to calculate each of representative frequency deviations for each of the groups, respectively, each of the representative frequency deviations being calculated statistically based on the frequency deviations of the mobile stations belonging to each of the groups, respectively;
• and
• a compensation circuit to multiply each of the signals by each of compensation signals that are generated based on the representative frequency deviations,
• wherein the second detecting circuit acquires the frequency deviations generated from the signals,
• wherein the classifying circuit detects a peak frequency corresponding to a peak concentration of frequency deviations and classifies each of mobile stations corresponding to a reception signal having a frequency deviation included in a specified range as a first mobile station based on the peak frequency, where the mobile stations are considered to be moving with a same moving speed within the specified range, and
• wherein when the peak frequency is at least a specified threshold value determined in response to a fact that corresponding mobile stations are moving with at least a specified speed, the classifying circuit classifies each of mobile stations corresponding to a reception signal having a frequency deviation included in the specified range as the first mobile station based on the peak frequency.

A frequency control method comprising:

• detecting each of frequency deviations generated from each of signals transmitted from each of mobile stations respectively;
• acquiring classification information about at least one of location, moving speed and moving direction of each of the mobile stations;
• classifying each of the mobile stations into groups based on the classification information;
• calculating each of representative frequency deviations for each of the groups, respectively, each of the representative frequency deviations being calculated statistically based on the frequency deviations of the mobile stations belonging to each of the groups, respectively;
• and
• multiplying each of the signals by each of compensation signals that are generated based on the representative frequency deviations,
• wherein the acquiring includes acquiring the frequency deviations generated from the signals,
• wherein the classifying includes detecting a peak frequency corresponding to a peak concentration of frequency deviations and classifying each of mobile stations corresponding to a reception signal having a frequency deviation included in a specified range as a first mobile station based on the peak frequency, where the mobile stations are considered to be moving with a same moving speed within the specified range, and
• wherein when the peak frequency is at least a specified threshold value determined in response to a fact that corresponding mobile stations are moving with at least a specified speed, the classifying includes classifying each of mobile stations corresponding to a reception signal having a frequency deviation included in the specified range as the first mobile station based on the peak frequency.