Communications system and communication control method
OwnerTakayuki Shibatainventor
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Abstract
In a communications system for adaptively controlling a modulation mode and encoding rate for data transmitted from a transmitter to a receiver, the transmitter comprises adaptive modulation control means for controlling the modulation mode and encoding rate in accordance with the channel quality notified from the receiver, and transmission power control means for controlling a transmission power ratio of the control channel to a data channel in accordance with a control channel error detection result notified from the receiver and the modulation mode and encoding rate.
Claims14
A communications system for adaptively controlling a modulation mode and an encoding rate for data transmitted from a transmitter to a receiver, wherein:
- said receiver comprises channel quality measuring means for measuring a channel quality, and control channel error detecting means for detecting an error of a control channel, and
- said transmitter comprises adaptive modulation control means for controlling the modulation mode and encoding rate in accordance with the channel quality notified from said receiver, and transmission power control means for controlling a transmission power ratio of the control channel to a data channel in accordance with a control channel error detection result notified from said receiver and the modulation mode and encoding rate.
A transmitter for adaptively controlling a modulation mode and an encoding rate for data transmitted to a receiver, comprising:
- adaptive modulation control means for controlling a modulation mode and an encoding rate in accordance with a channel quality notified from said receiver;
- and
- transmission power control means for controlling a transmission power ratio of a control channel to a data channel in accordance with a control channel error detection result notified from said receiver and the modulation mode and encoding rate.
A communication control method for adaptively controlling a modulation mode and an encoding rate for data transmitted from a transmitter to a receiver, comprising the steps of:
- measuring a channel quality in said receiver;
- detecting a control channel error in said receiver;
- notifying the channel quality and the control channel error from said receiver to said transmitter;
- controlling, in said transmitter, a modulation mode and an encoding rate in accordance with the channel quality notified from said receiver;
- and
- controlling, in said transmitter, a transmission power ratio of a control channel to a data channel in accordance with a control channel error detection result notified from said receiver and the modulation mode and encoding rate.
A transmission control method in a transmitter for adaptively controlling a modulation mode and an encoding rate for data transmitted to a receiver comprising the steps of:
- controlling the modulation mode and encoding rate in accordance with a channel quality notified from said receiver;
- and
- controlling a transmission power ratio of a control channel to a data channel in accordance with a control channel error detection result notified from said receiver and the modulation mode and encoding rate.
Dependencies are inferred from the claim text.