Mobile communication system
View Patent ↗A mobile communication system which is capable of, when carrying out mobile communication using a shared channel, increasing in efficiency of transmission timing of the data transmission rate request value to prevent wasteful power consumption and hence reduce power consumption. The mobile station apparatus of the mobile communication system measures CIR of the received signal from the base station apparatus at the CIR measuring section, and decides the data transmission rate request value corresponding to the measured CIR value at the rate request value deciding section. Also, it detects an error of the received signal at the CRC section, and, when no error is found, calculates a difference between the average data transmission rate from the base station apparatus and the data transmission request value at the rate request value transmission controlling section. Then, it transmits the data transmission rate request value to the base station apparatus only when the obtained difference is larger than a threshold value.
1. A mobile station apparatus comprising:
a receiver that receives data from a base station;
a measuring section that measures a reception quality of the data;
a determining section that determines a request value based on the reception quality, the request value indicative of a data transmission rate; and
a transmitter that transmits the request value to the base station if the data transmission rate indicated by the request value has changed from a data transmission rate indicated by a previous request value,
wherein the transmitter transmits the request value to the base station periodically if the request value and the previous value are the same.
2. A receiving method comprising:
receiving data from a transmitter;
measuring a reception quality of the data;
determining a request value based on the reception quality, the request value indicative of a data transmission rate; and
transmitting the request value to the transmitter if the data transmission rate indicated by the request value has changed from a data transmission rate indicated by a previous request value, wherein the request value is transmitted to the transmitter periodically if the request value and the previous value are the same.
3. A mobile communication system comprising a receiving apparatus and a transmitting apparatus,
the receiving apparatus comprising:
a receiver that receives data from the transmitting apparatus;
a measuring section that measures a reception quality of the data;
a determining section that determines a request value based on the reception quality, the request value indicative of a data transmission rate; and
a transmitter that transmits the request value to the transmitting apparatus if the data transmission rate indicated by the request value has changed from a data transmission rate indicated by a previous request value and transmits the request value to the transmitting apparatus periodically if the request value and the previous value are the same;
the transmitting apparatus comprising:
a transmitter that transmits the data to the receiving apparatus;
a receiver that receives the request value from the receiving apparatus; and
a setting section that, if the request value is not received from the receiving apparatus, sets a transmission rate for the receiving apparatus to the previous request value.
4. The mobile communication system according to claim 3 , wherein the request value is determined based on the reception quality of a pilot symbol.
5. The mobile communication system according to claim 3 , wherein the transmitting apparatus is a base station apparatus.