RADIO TRANSMISSION APPARATUS, AND RADIO TRANSMISSION METHOD
Provided is a radio transmission device, which is enabled to improve a reception quality by improving the channel estimation precision of specific data such as control data. In this device, a mapping control unit ( 109 ) acquires pilot position information (at ST 1010 ), and determines a resource block or a candidate for the mapping position of control channel data (at ST 1020 ). The mapping control unit ( 109 ) also determines a resource block other than that candidate as the mapping position of other data (at ST 1030 ). Moreover, the mapping control unit ( 109 ) generates a mapping control signal for instructing a mapping unit ( 104 ) the candidate of the mapping position of the control data and the mapping position of other data, that is, a mapping method, and outputs the generated mapping control signal to the mapping unit ( 104 ).
1 . A radio transmitting apparatus comprising:
a pilot multiplexing section that performs frequency division multiplexing on pilots to a first time slot;
a data multiplexing section that performs frequency division multiplexing on data other than the pilots to time slots other than the first time slot; and
a controlling section that controls the data multiplexing section such that, out of the data other than the pilots, data that requires high channel estimation accuracy is multiplexed in same frequencies as the pilots.
2 . The radio transmitting apparatus according to claim 1 , wherein the data that requires high channel estimation accuracy comprises control channel data or data with a modulation and coding scheme level equal to or higher than a threshold.
3 . The radio transmitting apparatus according to claim 1 , further comprising a repetition section that repeats the data that requires high channel estimation accuracy,
wherein the data multiplexing section performs frequency division multiplexing on the repeated data that requires high channel estimation accuracy to a plurality of time slots other than the first time slot.
4 . The radio transmitting apparatus according to claim 1 , wherein the controlling section controls the data multiplexing section such that frequencies of the data that requires high channel estimation accuracy are different between time slots.
5 . The radio transmitting apparatus according to claim 4 , further comprising a repetition section that repeats the data that requires high channel estimation accuracy,
wherein the controlling section controls the data multiplexing section such that frequencies of the repeated data that requires high channel estimation accuracy are different between time slots.
6 . The radio transmitting apparatus according to claim 1 , wherein the controlling section controls the data multiplexing section such that a number of the data that requires high channel estimation accuracy multiplexed in a time domain becomes larger than a number of the data that requires high channel estimation accuracy multiplexed in a frequency domain.
7 . The radio transmitting apparatus according to claim 6 , wherein the controlling section further controls the data multiplexing section such that frequencies of the data that requires high channel estimation accuracy are different between time slots.
8 . The radio transmitting apparatus according to claim 1 , wherein the controlling section controls the data multiplexing section such that the data that requires high channel estimation accuracy is subjected to frequency division multiplexing in time slots closer to the first time slot, out of the plurality of time slots other than the first time slot.
9 . The radio transmitting apparatus according to claim 1 , wherein the controlling section controls the data multiplexing section such that, according to a moving speed of a radio receiving apparatus, a number of the data that requires high channel estimation accuracy multiplexed in a time domain becomes larger than the number of the data that requires high channel estimation accuracy multiplexed in a frequency domain, or a number of the data that requires high channel estimation accuracy multiplexed in the time domain becomes smaller than a number of the data that requires high channel estimation accuracy multiplexed in the frequency domain.
10 . A communication terminal apparatus comprising the radio transmitting apparatus according to claim 1 .
11 . A base station apparatus comprising the radio transmitting apparatus according to claim 1 .
12 . A radio transmission method comprising:
a first step of performing frequency division multiplexing on pilots to a first time slot; and
a second step of performing frequency division multiplexing on data other than the pilots to time slots other than the first time slot,
wherein the second step is controlled such that, out of the data other than the pilots, data that requires high channel estimation accuracy is multiplexed in same frequencies as the pilots.