Radio communication apparatus and transfer rate decision method
View Patent ↗A transmission rate determining method that enables assignment of transmission rate (modulation scheme and coding rate) to be optimized with high accuracy in the AMC technique. In the method, in a base station, Doppler frequency detector 117 detects the Doppler frequency (moving speed) of each mobile station. MCS assignment section 125 corrects a relational expression of MCS (coding rate and modulation scheme) and CIR based on the Doppler frequency (moving speed) obtained in Doppler frequency detector 117 , for example, corrects a threshold in CIR, and determines MCS optimal for CIR report value. Results of assignment in MCS assignment section 125 are output to coding section 101 and modulation section 103.
1. A radio communication apparatus comprising:
a channel quality information extracting section that extracts channel quality information showing channel quality of a communicating partner from a received signal;
a determining section that determines a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting section using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a detecting section that detects a relative moving speed of the communicating partner;
an acquiring section that acquires from the received signal retransmission request information indicative of whether retransmission to the communicating partner is required; and
a correcting section that corrects the transmission rate determined in the determining section, based on the relative moving speed detected in the detecting section and the retransmission request information acquired in the acquiring section.
2. A radio communication apparatus comprising:
a channel quality information extracting section that extracts channel quality information showing channel quality of a communicating partner from a received signal;
a determining section that determines a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting section using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a detecting section that detects a relative moving speed of the communicating partner;
an acquiring section that acquires from the received signal retransmission request information indicative of whether retransmission to the communicating partner is required;
a relative moving speed correcting section that corrects the relative moving speed detected in the detecting section, based on the retransmission request information acquired in the acquiring section; and
a correcting section that corrects the transmission rate determined in the determining section, based on the corrected relative moving speed.
3. A radio communication apparatus comprising:
a channel quality information extracting section that extracts channel quality information showing channel quality of a communicating partner from a received signal;
a determining section that determines a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting section using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a detecting section that detects a relative moving speed of the communicating partner;
a calculating section that calculates an amount of variation in channel quality;
a relative moving speed correcting section that corrects the relative moving speed detected in the detecting section, based on the amount of variation in channel quality calculated in the calculating section; and
a correcting section that corrects the transmission rate determined in the determining section, based on the corrected relative moving speed.
4. A radio communication apparatus comprising:
a channel quality information extracting section that extracts channel quality information showing channel quality of a communicating partner from a received signal;
a determining section that determines a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting section using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a detecting section that detects a relative moving speed of the communicating partner; and
a correcting section that corrects the channel quality information extracted in the channel quality information extracting section based on the relative moving speed detected in the detecting section.
5. A radio communication apparatus comprising:
a channel quality information extracting section that extracts channel quality information showing channel quality of a communicating partner from a received signal;
a determining section that determines a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting section using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a detecting section that detects a relative moving speed of the communicating partner; and
a correcting section that corrects the relational expression based on the relative moving speed detected in the detecting section.
6. The radio communication apparatus according claim 5 , further comprising:
an acquiring section that acquires from the received signal retransmission request information indicative of whether retransmission to the communicating partner is required, wherein
the correcting section corrects the relational expression based on the relative moving speed detected in the detecting section and the retransmission request information acquired in the acquiring section.
7. The radio communication apparatus according to claim 5 , further comprising:
an acquiring section that acquires from the received signal retransmission request information indicative of whether retransmission to the communicating partner is required; and
a relative moving speed correcting section that corrects the relative moving speed detected in the detecting section, based on the retransmission request information acquired in the acquiring section, wherein
the correcting section corrects the relational expression based on the relative moving speed corrected in the relative moving speed correcting section.
8. The radio communication apparatus according to claim 5 , further comprising:
a calculating section that calculates an amount of variation in channel quality; and
a relative moving speed correcting section that corrects the relative moving speed detected in the detecting section, based on the amount of variation in channel quality calculated in the calculating section, wherein
the correcting section corrects the relational expression based on the relative moving speed corrected in the relative moving speed correcting section.
9. A radio communication apparatus comprising:
a channel quality information extracting section that extracts channel quality information showing channel quality of a communicating partner from a received signal;
a determining section that determines a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting section using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a calculating section that calculates an amount of variation in channel quality; and
a correcting section that corrects the relational expression based on the amount of variation in channel quality calculated in the calculating section.
10. A communication system comprising:
a radio communication apparatus; and
a communicating partner radio communication apparatus that is a communicating partner of the radio communication apparatus, wherein:
the radio communication apparatus comprises:
a correcting section that performs predetermined correction processing based on information regarding a variation in channel quality, in determining a transmission rate; and
a transmitting section that transmits to a communicating partner a signal to suspend the correction processing in the communicating partner; and
the communicating partner radio communication apparatus comprises:
a correcting section that performs predetermined correction processing based on the information regarding a variation in channel quality, in determining a transmission rate;
a receiving section that receives the signal to suspend the correction processing transmitted from the radio communication apparatus; and
a control section that suspends the correction processing in the correcting section based on the signal received in the receiving section.
11. A transmission rate determining method in a radio communication apparatus, comprising:
a channel quality information extracting step of extracting channel quality information showing channel quality of a communicating partner from a received signal;
a determining step of determining a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting step using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a detecting step of detecting a relative moving speed of the communicating partner; and
a correcting step of correcting the channel quality information extracted in the channel quality information extracting step based on the relative moving speed detected in the detecting step.
12. A transmission rate determining method in a radio communication apparatus, comprising:
a channel quality information extracting step of extracting channel quality information showing channel quality of a communicating partner from a received signal;
a determining step of determining a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting step using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a detecting step of detecting a relative moving speed of the communicating partner; and
a correcting step of correcting the relational expression based on the relative moving speed detected in the detecting step.
13. A transmission rate determining method in a radio communication apparatus, comprising:
a channel quality information extracting step of extracting channel quality information showing channel quality of a communicating partner from a received signal;
a determining step of determining a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting step using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a detecting step of detecting a relative moving speed of the communicating partner; and
a correcting step of correcting the channel quality information extracted in the channel quality information extracting step based on the relative moving speed detected in the detecting step.
14. A transmission rate determining method in a radio communication apparatus, comprising:
a channel quality information extracting step of extracting channel quality information showing channel quality of a communicating partner from a received signal;
a determining step of determining a transmission rate in response to the channel quality of the channel quality information extracted in the channel quality information extracting step using a relational expression that specifies a relationship between the channel quality and the transmission rate;
a calculating step of calculating an amount of variation in channel quality as information regarding the variation in channel quality; and
a correcting step of correcting the relational expression based on the amount of variation in channel quality calculated in the calculating step.