Communication terminal apparatus and base station apparatus
View Patent ↗An allocation section 101 in a base station apparatus of the present invention sets the transmission rate of a transmit signal for a communication terminal apparatus based on a DRC signal transmitted from that communication terminal apparatus. A power margin information detector 117 detects power margin information from a demodulated signal generated by a demodulator 115 , and, using that power margin information, a power setting section 118 makes a setting so as to give the minimum transmission power value at which received signal characteristics in each communication terminal apparatus meet the desired quality. Using the set transmission power value, the base station apparatus transmits a transmit signal of the set transmission rate to a communication terminal apparatus. By this means it is possible to suppress interference to a communication terminal apparatus that performs adaptive modulation communication with another base station apparatus and a communication terminal apparatus that performs adaptive modulation communication with the local base station apparatus at the same time.
1. A communication terminal apparatus comprising:
a reception section that receives a signal transmitted from a base station apparatus; and
a transmission section that transmits an indicator indicating a modulation scheme and a power adjustment level in accordance with quality of the received signal, wherein:
the transmission section transmits (a) the indicator indicating a predetermined modulation scheme and a predetermined power adjustment level when the quality of the received signal is a predetermined value, (b) the indicator indicating a modulation scheme smaller than the predetermined modulation scheme and the predetermined power adjustment level when the quality of the received signal is smaller than the predetermined value, and (c) the indicator indicating the predetermined modulation scheme and a power adjustment level smaller than the predetermined power adjustment level when the quality of the received signal is larger than the predetermined value.
2. The communication terminal apparatus according to claim 1 , wherein the transmission section transmits the indicator indicating a smaller modulation scheme as the quality of the received signal decreases.
3. The communication terminal apparatus according to claim 1 , wherein the transmission section transmits the indicator indicating a smaller power adjustment level as the quality of the received signal increases.
4. A base station apparatus comprising:
a reception section that receives an indicator from a communication terminal apparatus; and
a control section that controls a modulation scheme and a power adjustment level of a signal to be transmitted to the communication terminal apparatus in accordance with the indicator, wherein:
the indicator indicates (a) a predetermined modulation scheme and a predetermined power adjustment level when quality of a previously transmitted signal is a predetermined value, (b) a modulation scheme smaller than the predetermined modulation scheme and the predetermined power adjustment level when the quality of the previously transmitted signal is smaller than the predetermined value, and (C) the predetermined modulation scheme and a power adjustment level smaller than the predetermined power adjustment level when the quality of the previously transmitted signal is larger than the predetermined value.
5. The base station apparatus according to claim 4 , wherein the indicator indicates a smaller modulation scheme as the quality of the transmitted signal decreases.
6. The base station apparatus according to claim 4 , wherein the indicator indicates a smaller power adjustment level as the quality of the transmitted signal increases.
7. A radio communication method comprising:
a reception step of receiving a signal transmitted from a base station apparatus; and
a transmission step of transmitting an indicator indicating a modulation scheme and a power adjustment level in accordance with quality of the received signal, wherein:
in the transmission step, (a) transmitting the indicator indicating a predetermined modulation scheme and a predetermined power adjustment level when the quality of the received signal is a predetermined value, (b) transmitting the indicator indicating a modulation scheme smaller than the predetermined modulation scheme and the predetermined power adjustment level when the quality of the received signal is smaller than the predetermined value, and (c) transmitting the indicator indicating the predetermined modulation scheme and a power adjustment level smaller than the predetermined power adjustment level when the quality of the received signal is larger than the predetermined value.
8. A radio communication method comprising:
a reception step of receiving an indicator from a communication terminal apparatus; and
a control step of controlling a modulation scheme and a power adjustment level of a signal to be transmitted to the communication terminal apparatus in accordance with the indicator, wherein:
the indicator indicates (a) a predetermined modulation scheme and a predetermined power adjustment level when quality of a previously transmitted signal is a predetermined value, (b) a modulation scheme smaller than the predetermined modulation scheme and the predetermined power adjustment level when the quality of the previously transmitted signal is smaller than the predetermined value, and (c) the predetermined modulation scheme and a power adjustment level smaller than the predetermined power adjustment level when the quality of the previously transmitted signal is larger than the predetermined value.