Frequency deviation estimating method and base station apparatus
AssigneeFujitsu Limited
InventorHiroaki SENOO
Life of this patent
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Abstract
A frequency deviation is to be estimated in a wireless communication system in which a control data transmission channel and a user data transmission channel are allocated to different frequency bands. An estimation result using a reference signal for modulation in the user data control channel and an estimation result using a reference signal for estimating channel quality may be combined, according to an estimation result using a reference signal for modulation in the control data transmission channel, in order to modify the allocation period of the reference signal for estimating channel quality depending on the estimation result.
Claims14
A base station apparatus for a wireless communication system in which a control data transmission channel and a user data transmission channel are allocated to different frequency bands, the base station apparatus comprising:
- a first estimator configured to estimate a frequency deviation using a first reference signal for demodulation, included at predetermined time intervals, in the control data transmission channel that is received;
- a second estimator configured to estimate a frequency deviation using a second reference signal for demodulation, included at time intervals longer than those of the first reference signal, in the user data transmission channel that is received;
- a third estimator configured to estimate a frequency deviation using a third reference signal for estimating channel quality, included at time intervals longer than those of each of the first and second reference signals, in the user data transmission channel that is received;
- and
- a determinator configured to obtain a frequency deviation estimation result by
- obtaining the frequency deviation estimation result from a first value of the frequency deviation estimated by the first estimator when the first value is a first threshold value or greater,
- obtaining the frequency deviation estimation result from a combination of the first value of the frequency deviation estimated by the first estimator and a second value of the frequency deviation estimated by the second estimator when the first value is less than the first threshold value and greater than or equal to a second threshold value that is smaller than the first threshold value, and
- obtaining the frequency deviation estimation result from a combination of the first value of the frequency deviation estimated by the first estimator and a third value of the frequency deviation estimated by the third estimator when the first value is less than the second threshold value.
A frequency deviation estimating method for a wireless communication system in which a control data transmission channel and a user data transmission channel are allocated to different frequency bands, the frequency deviation estimating method comprising:
- first estimating a frequency deviation using a first reference signal for demodulation, included at predetermined time intervals, in the control data transmission channel that is received;
- second estimating a frequency deviation using a second reference signal for demodulation, included at time intervals longer than those of the first reference signal, in the user data transmission channel that is received;
- third estimating a frequency deviation using a third reference signal for estimating channel quality, included at time intervals longer than those of each of the first and second reference signals, in the user data transmission channel that is received;
- and
- obtaining a frequency deviation estimation result by
- obtaining the frequency deviation estimation result from a first value of the frequency deviation estimated by the first estimating when the first value is a first threshold value or greater;
- obtaining the frequency deviation estimation result from a combination of the first value of the frequency deviation estimated by the first estimating and a second value of the frequency deviation estimated by the second estimating when the first value is less than the first threshold value and greater than or equal to a second threshold value that is smaller than the first threshold value;
- and
- obtaining the frequency deviation estimation result from a combination of the first value of the frequency deviation estimated by the first estimating and a third value of the frequency deviation estimated by the third estimating when the first value is less than the second threshold value.
A base station apparatus for a wireless communication system in which a control data transmission channel and a user data transmission channel are allocated to different frequency bands, the base station apparatus comprising:
- a first estimator configured to estimate a frequency deviation using a first reference signal for demodulation, included at predetermined time intervals, in the control data transmission channel that is received;
- a second estimator configured to estimate a frequency deviation using a second reference signal for demodulation, included at the predetermined time intervals, in the user data transmission channel that is received;
- a third estimator configured to estimate a frequency deviation using a third reference signal for estimating channel quality, included at time intervals longer than those of the second reference signal, in the user data transmission channel that is received;
- and
- a determinator configured to obtain a frequency deviation estimation result by
- obtaining the frequency deviation estimation result from one of a first value of the frequency deviation estimated by the first estimator and a second value of the frequency deviation estimated by the second estimator when the one of the first value and the second value is a first threshold value or greater, and
- obtaining the frequency deviation estimation result from a combination of the one of the first value of the frequency deviation estimated by the first estimator and a second value of the frequency deviation estimated by the second estimator and a third value of the frequency deviation estimated by the third estimator when the one of the first value and the second value is less than the first threshold value.
A frequency deviation estimating method for a wireless communication system in which a control data transmission channel and a user data transmission channel are allocated to different frequency bands, the frequency deviation estimating method comprising:
- first estimating a frequency deviation using a first reference signal for demodulation, included at predetermined time intervals, in the control data transmission channel that is received;
- second estimating a frequency deviation using a second reference signal for demodulation, included at the predetermined time intervals, in the user data transmission channel that is received;
- third estimating a frequency deviation using a third reference signal for estimating channel quality, included at time intervals longer than those of the second reference signal, in the user data transmission channel that is received;
- and
- obtaining a frequency deviation estimation result by
- obtaining the frequency deviation estimation result from one of a first value of the frequency deviation estimated by the first estimating and a second value of the frequency deviation estimated by the second estimating when the one of the first value and the second value is a first threshold value or greater, and
- obtaining the frequency deviation estimation result from a combination of the one of the first value of the frequency deviation estimated by the first estimating and a second value of the frequency deviation estimated by the second estimating and a third value of the frequency deviation estimated by the third estimating when the one of the first value and the second value is less than the first threshold value.
Dependencies are inferred from the claim text.