Communication device and communication method
AssigneeNEC Corporation
InventorTakahiro Adachi
Life of this patent
Estimating the term…
Abstract
A communication device, which performs wireless communication according to an adaptive modulation scheme, includes a modulator that modulates data to be transmitted to generate a transmission signal, and a transmission power control unit that controls a transmission power of the transmission signal, wherein, when the modulation level increases according to the adaptive modulation scheme, the transmission power control unit starts control of the transmission power before the modulator increases the modulation level.
Claims14
A communication method performed by a communication device with an other communication device according to an adaptive modulation scheme, the communication method comprising:
- modulating data to be transmitted at one of a first modulation level and a second modulation level to generate a transmission signal;
- adaptively changing a modulation level from the first modulation level to the second modulation level using first information concerning the second modulation level received from the other communication device;
- performing first transmission power control of a transmission power of the transmission signal using second information concerning the transmission power received from the other communication device;
- performing second transmission power control of the transmission power using a second transmission power level when the changing the modulation level from the first modulation level to the second modulation level is an increase of the modulation level, the second transmission power level corresponding to the second modulation level being lower than a first transmission power level corresponding to the first modulation level;
- performing third transmission power control of the transmission power when the changing the modulation level from the first modulation level to the second modulation level is a decrease of the modulation level;
- determining using a predetermined basis whether to change the modulation level;
- and
- detecting whether the second modulation level is higher than the first modulation level or the second modulation level is lower than the first modulation level,
- wherein the second transmission power control is performed before the modulation level is increased from the first modulation level to the second modulation level.
A communication device configured to communicate with an other communication device according to an adaptive modulation scheme, the communication device comprising:
- a modulator configured to modulate data to be transmitted at one of a first modulation level and a second modulation level to generate a transmission signal;
- a changer configured to adaptively change a modulation level from the first modulation level to the second modulation level using first information concerning the second modulation level received from the other communication device;
- a first transmission power controller configured to perform first transmission power control of a transmission power of the transmission signal using second information concerning the transmission power received from the other communication device;
- a second transmission power controller configured to perform second transmission power control of the transmission power using a second transmission power level when the changing the modulation level from the first modulation level to the second modulation level is an increase of the modulation level, the second transmission power level corresponding to the second modulation level being lower than a first transmission power level corresponding to the first modulation level;
- a third transmission power controller configured to perform third transmission power control of the transmission power when the changing the modulation level from the first modulation level to the second modulation level is a decrease of the modulation level;
- a determiner configured to determine using a predetermined basis whether to change the modulation level;
- and
- a detector configured to detect whether the second modulation level is higher than the first modulation level or the second modulation level is lower than the first modulation level,
- wherein the second transmission power control is performed before the modulation level is increased from the first modulation level to the second modulation level.
Dependencies are inferred from the claim text.