Power controllable wireless mobile communications system of adaptive modulation and coding scheme and method therefor

A mobile communications system employing an adaptive modulation and coding scheme, the system comprising:

• a signal-to-noise ratio (SNR) extracting unit which extracts a SNR from a received signal that is processed using a predetermined first modulation and coding scheme;
• a modulation and coding scheme determining unit which compares the extracted SNR with a first requested SNR for the received signal, and determines a second modulation and coding scheme reflecting conditions that include the result of the comparison;
• a power control value determining unit which compares the extracted SNR with a second requested SNR for a signal of the second modulation and coding scheme, and determines a power control value according to the result of the comparison;
• a signal generating unit which inserts a field indicating the second modulation and coding scheme and a power control command field corresponding to the power control value, into a data signal to be transmitted, processes a resulting signal according to the second modulation and coding scheme, and generates a transmission signal;
• a command extracting unit which extracts the power control command field and the field indicating the second modulation and coding scheme from the signal transmitted by the signal generating unit;
• a processing unit which computes a power level according to a power control command of the power control command field, processes data to be transmitted according to the content of the field indicating the modulation and coding scheme, and generates a signal to be transmitted to the SNR extracting unit;
• and
• an amplifying unit which is placed between the SNR extracting unit and the processing unit, which amplifies the signal generated in the processing unit according to the power level, and transmits the amplified signal.

A mobile communications method employing an adaptive modulation and coding scheme, the method comprising:

• (a) extracting a SNR from a received signal which is processed using a predetermined first modulation and coding scheme;
• (b) comparing the extracted SNR with a first requested SNR for the received signal and determining a second modulation and coding scheme reflecting conditions that include the result of the comparison;
• (c) if the second modulation and coding scheme determined in (b) is different from the first modulation and coding scheme, comparing the extracted SNR with a second requested SNR for a signal of the second modulation and coding scheme and determining a power control value according to the result of the comparison;
• and
• (d) inserting a field indicating the determined second modulation and coding scheme and a power control command field corresponding to the power control value into a data signal to be transmitted, processing the resulting signal according to the second modulation and coding scheme and generating a transmission signal.

A mobile communications method employing an adaptive modulation and coding scheme, the method comprising:

• (a) extracting a SNR from a received signal which is processed using a predetermined first modulation and coding scheme;
• (b) comparing the extracted SNR with a first requested SNR for the received signal, and determining a second modulation and coding scheme reflecting conditions that include the result of the comparison;
• (c) if the second modulation and coding scheme determined in (b) is different from the first modulation and coding scheme, comparing the extracted SNR with a second requested SNR for a signal of the second modulation and coding scheme, and determining a power control value according to the result of the comparison;
• (d) inserting a field indicating the second modulation and coding scheme and a power control command field corresponding to the power control value into a data signal to be transmitted, processing the resulting signal according to the second modulation and coding scheme and generating a transmission signal;
• (e) extracting the power control command field and the field indicating a modulation and coding scheme from a signal which is generated and transmitted in (d);
• (f) computing a power level according to the power control command of the power control command field, processing data to be transmitted according to the content of the field indicating the modulation and coding scheme, and generating a signal to be transmitted to the SNR extracting unit;
• (g) amplifying the signal generated in (f) by the power level and transmitting the signal;
• and
• (h) repeating (a) through (g).