JP5566367B2 - Terminal apparatus, base station apparatus, and communication method - Google Patents

Description

  The present invention relates to a terminal device, a base station device, a communication system, and a communication method.

3GPP (Third Generation Partnership Project)
ct) WCDMA (Wideband Code Division Multi)
ple Access), LTE (Long Term Evolution), LTE
-A (LTE-Advanced) and WiMAX (Worldwide Interop)
In a mobile radio communication system such as erability for Microwave Access), a base station device (base station, transmitting station, downlink transmitting device, uplink receiving device, eNodeB) or an area covered by a transmitting station conforming to the base station (cell ( Cell
), A communication area can be expanded. In addition, by using different frequencies between adjacent cells or sectors, a terminal device (mobile station, receiving station, uplink transmitter, downlink receiver, mobile terminal, cell edge (cell edge) region or sector edge region, Although UE (User Equipment) can also perform communication without receiving interference of transmission signals from a plurality of base stations, there is a problem that frequency utilization efficiency is low. On the other hand, frequency utilization efficiency can be improved by using the same frequency between adjacent cells or sectors, but it is necessary to take measures against interference with terminal devices in the cell edge region.

Also, the modulation scheme and coding rate (MC
S; Modulation and Coding Scheme), spatial multiplexing number (number of layers, rank), precoder (precoder), etc. can be adaptively controlled to realize more efficient data transmission. Non-Patent Document 1 shows a method of performing these controls.

FIG. 43 shows a base station 4301 and a terminal device 43 that adaptively control the precoder in LTE.
FIG. In LTE, downlink transmission downlink transmission signal 4 to be transmitted
When the precoder is adaptively controlled with respect to the terminal 303, the terminal device 4302 is configured to be the base station 430.
Referring to a downlink reference signal (RS) included in a downlink transmission downlink transmission signal 4303 transmitted from 1, precoding matrix information PMI (Precoding Matrix Indic) for specifying a suitable precoder
attor) and reports to the base station 4301 via the uplink channel 4304. Non-Patent Document 1 describes a feedback mode in which precoder information is reported periodically. A terminal device in which a feedback mode for periodically reporting precoder information is set, uses a codebook that is a table of a plurality of predetermined precoding matrices,
PMI, which is an index corresponding to a suitable precoding matrix in the codebook, is periodically calculated and reported.

3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (Release 8), 12 May 2008, 3GPP TS 36.213 V8.8.0 (2009-9 )

However, in the conventional communication method, only information indicating the precoding matrix defined in one codebook can be reported, and it is difficult to specify and apply an appropriate precoder, which is a factor that hinders improvement in transmission efficiency. .

The present invention has been made in view of the above problems, and its object is to provide a terminal device capable of efficiently specifying and applying precoder information using a plurality of partial precoder information,
A base station apparatus, a communication system, and a communication method are provided.

(1) The present invention has been made to solve the above-described problems, and a terminal device according to an aspect of the present invention is a terminal device that communicates with a base station device, and is a single device that designates a suitable precoder. A first feedback mode for periodically reporting precoder information to the base station apparatus; and a second feedback mode for periodically reporting a plurality of partial precoder information designating the preferred precoder to the base station apparatus. It is characterized by switching.

(2) Moreover, the terminal device according to an aspect of the present invention is the above-described terminal device, and in the first feedback mode, periodically reports a rank index specifying a suitable spatial multiplexing number to the base station device. It is characterized by doing.

(3) Moreover, the terminal device according to an aspect of the present invention is the terminal device described above, and in the second feedback mode, the resource used when reporting the rank index in the first feedback mode is used. And reporting the partial precoder information.

(4) A terminal device according to an aspect of the present invention is the terminal device described above, and periodically reports a reception quality indicator designating a suitable transmission rate to the base station device in the first feedback mode. It is characterized by doing.

(5) Moreover, the terminal device according to an aspect of the present invention is the terminal device described above, and in the second feedback mode, a resource used when reporting the reception quality indicator in the first feedback mode is provided. And reporting the partial precoder information.

(6) A terminal device according to an aspect of the present invention is the terminal device described above, and periodically reports a rank index designating a suitable spatial multiplexing number to the base station device in the second feedback mode. It is characterized by doing.

(7) A terminal device according to an aspect of the present invention is the terminal device described above, and reports the partial precoder information in the same period as the rank index in the second feedback mode.

(8) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the partial precoder information is reported at a timing different from the rank index in the second feedback mode.

(9) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the rank index and the partial precoder information are alternately reported in the second feedback mode.

(10) A terminal device according to an aspect of the present invention is the terminal device described above, and periodically reports a reception quality indicator specifying a suitable transmission rate to the base station device in the second feedback mode. It is characterized by doing.

(11) A terminal device according to an aspect of the present invention is the terminal device described above, and reports the partial precoder information in the same period as the reception quality indicator in the second feedback mode. .

(12) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, and reports the partial precoder information at a timing different from the reception quality index in the second feedback mode. .

(13) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the reception quality indicator and the partial precoder information are alternately reported in the second feedback mode. .

(14) A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and periodically reports one precoder information specifying a suitable precoder to the base station apparatus. A parameter indicating which of the first feedback mode and the second feedback mode in which a plurality of partial precoder information specifying the suitable precoder is periodically reported to the base station apparatus is set in the terminal apparatus. It is characterized by that.

(15) A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and periodically reports one precoder information specifying a suitable precoder to the base station apparatus. Either the first feedback mode or the second feedback mode in which a plurality of partial precoder information designating the suitable precoder is periodically reported to the base station apparatus is set in the terminal apparatus, When setting the feedback mode, the first parameter that specifies the period for reporting the precoder information is set in the terminal device, and when the second feedback mode is set, the first parameter, A second parameter indicating an offset of timing for reporting partial precoder information is set in the terminal device.

(16) A communication system according to an aspect of the present invention is a communication system that performs communication between a base station device and a terminal device, and the base station device has one precoder information that specifies a suitable precoder. A first feedback mode that periodically reports to the base station apparatus;
One of the second feedback modes in which a plurality of partial precoder information specifying the suitable precoder is periodically reported to the base station apparatus is set in the terminal apparatus, and the terminal apparatus is set in the set feedback mode. In response, either the precoder information or the partial precoder information is reported to the base station apparatus.

(17) A communication method according to an aspect of the present invention is a communication method in a terminal apparatus that communicates with a base station apparatus, and periodically transmits one precoder information specifying a suitable precoder to the base station apparatus. The method includes a step of switching between a first feedback mode for reporting and a second feedback mode for periodically reporting a plurality of partial precoder information designating the suitable precoder to the base station apparatus.

(18) A communication method according to an aspect of the present invention is a communication method in a base station apparatus that communicates with a terminal apparatus, and periodically transmits one precoder information designating a suitable precoder to the base station apparatus. A parameter indicating which of a first feedback mode to report and a second feedback mode in which a plurality of partial precoder information designating the suitable precoder is periodically reported to the base station apparatus is provided to the terminal apparatus. It has the step to set, It is characterized by the above-mentioned.

(19) A communication method according to an aspect of the present invention is a communication method in a base station device that communicates with a terminal device, and periodically transmits one precoder information specifying a suitable precoder to the base station device. A first feedback mode for reporting and a second feedback mode for periodically reporting to the base station device a plurality of partial precoder information specifying the preferred precoder are set to the terminal device. A second step of setting, in the terminal device, a first parameter for designating a period for reporting the precoder information when setting the first feedback mode, and setting the second feedback mode. A second parameter indicating an offset of the timing for reporting the first parameter and the partial precoder information. And having a third step of setting the meter to the terminal device.

According to the present invention, it is possible to efficiently designate and apply precoder information using a plurality of partial precoder information.

It is a schematic block diagram which shows the structure of the communication system in the 1st Embodiment of this invention. FIG. 3 is a diagram illustrating an example of a downlink radio frame configuration in the embodiment. FIG. 3 is a diagram illustrating an example of an uplink radio frame configuration in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the partial bandwidth structure in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is the schematic which shows an example of the procedure in the embodiment. It is a figure which shows an example of the parameter table in the embodiment. It is a figure which shows an example of the parameter table in the embodiment. It is a figure which shows an example of the code book in the embodiment. It is a figure which shows an example of the code book in the embodiment. It is the schematic which shows an example of the partial precoder in the same embodiment. It is the schematic which shows an example of the reference signal measurement in the embodiment. It is the schematic which shows an example of the procedure in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the 2nd Embodiment of this invention. It is a figure which shows an example of the parameter table in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the feedback mode in the embodiment. It is a figure which shows an example of the component carrier structure in the 3rd Embodiment of this invention. It is the schematic which shows an example of the procedure in the embodiment. It is a figure which shows an example of the transmission point structure in the 4th Embodiment of this invention. It is the schematic which shows an example of the block configuration of the base station apparatus in the 5th Embodiment of this invention. It is the schematic which shows an example of the block configuration of the terminal device in the embodiment. It is a schematic block diagram which shows the structure of a communication system.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a configuration of a communication system according to the first embodiment of the present invention.
The communication system of the figure assumes an LTE-A system, and base station devices (
Base station, transmitting station, downlink transmitting apparatus, uplink receiving apparatus, eNodeB) 101 and terminal apparatus (mobile station, receiving station, uplink transmitting apparatus, downlink receiving apparatus, mobile terminal, UE;
(User Equipment) 102. When adaptively controlling the precoder with respect to the downlink transmission signal 103 to be transmitted, the terminal apparatus 102 receives the base station 1
The downlink reference signal (RS: R) included in the downlink transmission signal 103 transmitted from 01
Refer to the preference Signal and the preferred precoder (Preferred)
A plurality of pieces of partial precoder information designating (Precoder) are calculated and reported to the base station 101 via the uplink channel 104 periodically. Here, a case where partial precoder information 1 (PI1) and partial precoder information 2 (PI2) are reported as partial precoder information PI (Precoder Information) will be described. As a suitable precoder, for example, a method of calculating a precoder that increases the downlink received signal power in consideration of the downlink propagation path can be used.

FIG. 2 shows an example of a downlink radio frame configuration according to the present embodiment. The downlink is OFDM (Orthogonal Frequency Division Mu).
ltiplex) access scheme is used. In the downlink, a physical downlink control channel (PDCCH; Physical Downlink Control Channel).
el), Physical Downlink Shared Channel (PDSCH; Physical Downlin)
k Shared Channel). In addition, nine link reference signals (RS) are multiplexed on a part of the PDSCH. A downlink radio frame includes a downlink resource block (RB).
ok) pairs. This downlink RB pair is a unit such as downlink radio resource allocation, and is based on a predetermined frequency band (RB bandwidth) and time band (2 slots = 1 subframe). Become. One downlink RB pair is
It consists of two downlink RBs (RB bandwidth × slot) that are continuous in the time domain.
One downlink RB is composed of 12 subcarriers in the frequency domain, and is composed of 7 OFDM symbols in the time domain. The physical downlink control channel is a physical channel through which downlink control information such as a terminal device identifier, downlink shared channel scheduling information, uplink shared channel scheduling information, modulation scheme, coding rate, and retransmission parameter is transmitted. .

FIG. 3 shows an example of an uplink radio frame configuration according to the present embodiment. The uplink is SC-FDMA (Single Carrier-Frequency Div.
(Sion Multiple Access) method is used. In the uplink, the physical uplink shared channel (Physical Up Shared Shared Channel)
el; PUSCH), physical uplink control channel (Physical Uplink)
Control Channel; PUCCH) is assigned. PUSC
An uplink reference signal is assigned to a part of H or PUCCH. The uplink radio frame is composed of uplink RB pairs. The uplink RB pair is a unit such as uplink radio resource allocation, and has a predetermined frequency band (RB
Bandwidth) and time zone (2 slots = 1 subframe). One uplink RB pair consists of two uplink RBs that are continuous in the time domain (RB bandwidth × slot).
Consists of One uplink RB is composed of 12 subcarriers in the frequency domain, and is composed of 7 SC-FDMA symbols in the time domain.

FIG. 4 shows an example of the feedback mode according to the present embodiment. Note that the feedback mode here includes a combination of contents of reception quality information fed back from the terminal apparatus to the base station apparatus, a method for generating each content, a method for feeding back each content, and the like. The feedback mode 1 shown in FIG. 4 is a backward compatible feedback mode (first feedback mode), and is a mode for reporting in units of downlink bandwidth (or downlink component carrier bandwidth). In this feedback mode 1, RI (Rank Indicator), PMI (PMI (
Precoding Matrix Indicator), CQI (Channel)
(Quality Indicator) is reported. Here, RI is an index indicating a spatial multiplexing number (a rank index specifying a suitable spatial multiplexing number), PMI is an index indicating a suitable precoding matrix (precoder information specifying a suitable precoder), and CQI is It is an index (a reception quality index that specifies a suitable transmission rate) indicating a transmission rate for maintaining a predetermined communication quality. More specifically, in a subframe that satisfies Equation (1), W-CQI (Wideband-CQI) that is CQI for the downlink bandwidth and W-PMI (Wideband-PMI) that is PMI for the downlink bandwidth are set. Give feedback,
The RI is fed back in the subframe that satisfies Equation (2).

Here, n _f is a system frame number assigned to each radio frame, n _s is a slot number given to each slot in the radio frame, and N _P , M _RI , N _{OFFSET, CQI} ,
N _{OFFSET and RI} are predetermined values. The parentheses added to n _s / 2 are floor functions, and mod is a remainder function.

In feedback mode 1 shown in FIG. 4, W-CQI and W-PMI is the period of the _{N P} sub-frame, a primary _N subframes _OFFSET, (is offset) shifted by _CQI reported in subframe The RI is W-CQI and W-
N _P · M _RI period, which is M _RI times the PMI period, and N _O from the reference subframe
_{FFSET, CQI} + N _OFFSET, subframe shifted by _RI , ie W−
It is reported in the subframe further shifted by N _{OFFSET and RI} from CQI and W-PMI.

FIG. 5 shows an example of a subband configuration according to the present embodiment. The bandwidths of a plurality of adjacent RBs are combined to form a subband, and the plurality of subbands are combined into a BP (Bandwi
dth Part). In the configuration diagram shown in FIG. 5, S subbands and J BPs are arranged in the downlink bandwidth.

FIG. 6 shows an example of the feedback mode according to the present embodiment. Feedback mode 2 shown in FIG. 6 is a backward compatible feedback mode, and is a mode for reporting in units of downlink bandwidth (or downlink component carrier bandwidth) and BP. In this feedback mode 2, RI, PMI, and CQI are periodically reported. More specifically, in a subframe that satisfies Equation (3), W-CQI that is CQI for the downlink bandwidth and W-PMI that is PMI for the downlink bandwidth are fed back, and a subframe that satisfies Equation (4) is satisfied. The RI is fed back in the frame. In addition, S-CQI (Subb), which is the CQI for the partial bandwidth, is reported between W-CQI reports.
and-CQI).

Here, n _f is a system frame number assigned to each radio frame, n _s is a slot number given to each slot in the radio frame, and N _P , M _RI , N _{OFFSET, CQI} ,
N _{OFFSET, RI} and H are predetermined values.

In feedback mode 2 shown in FIG. 6, W-CQI and W-PMI are H · N _P
It is reported in a subframe shifted by N _{OFFSET and CQI} from the reference subframe in the subframe period. RI is M of the period of W-CQI and W-PMI.
_In the period of H, N _P , M _RI , which is _RI times, N _OFFSET from the reference subframe _,
CQI + N _OFFSET, a subframe shifted by _RI , that is, a subframe further shifted by N _{OFFSET, RI} from W-CQI and W-PMI is reported.
S-CQI is the period of H · _{N P} subframe is a reporting period of the W-CQI, reported J · K times in a cycle of _{N P.} Here, H = J · K + 1, J is the number of BPs, and K is a predetermined value. Each of the S-CQIs reported J / K times is a CQI representing BP. CQIs in J BPs are sequentially reported from CQIs in low-frequency BPs, and J reports are made so as to cover the downlink bandwidth. Further, by repeating K cycle J times of reporting, J · K times reporting is performed during the H · N _P subframe.

FIG. 7 shows an example of a procedure according to this embodiment. The procedure shown in FIG. 7 is an example of the procedure in the feedback mode 1 or the feedback mode 2. First, the base station is RRC (Radio Resource Control).
A feedback parameter in the terminal device is set through signaling, and periodic feedback is instructed (step S701). The terminal device instructed to perform periodic feedback performs RI according to the set feedback parameter (step S702).
, W-PMI (step S703) and W-CQI (step S704) are periodically reported to the base station apparatus. In the case of the feedback mode 2, the S-CQI is periodically reported (step S705). Here, a subframe that reports W-CQI or S-CQI and a subframe that reports RI may be the same subframe. In this case, RI is reported without reporting W-CQI or S-CQI. Step 7
It is also possible to set so that RI or W-PMI is not fed back by RRC signaling in 01. In that case, the terminal device reports only the CQI.

FIG. 8 shows an example of a parameter table related to CQI reporting. The parameter table shown in FIG. 8 is a parameter table related to W-CQI reporting. The base station apparatus and the terminal apparatus share a parameter table in advance. Based on feedback resource scheduling among a plurality of terminal apparatuses or changes in received power values for each terminal apparatus, the base station apparatus uses a W-CQI or W-PMI period and offset value suitable for any terminal apparatus. _{N P} and _{N OFFSET,} calculates the _CQI, using the parameter table, the calculated _{N P} and _{N OFFSET,} (first parameter specifying the period for reporting the precoder information) _{I CQI} corresponding to the _CQI selected from To set the terminal device. In addition,
Here, I _CQI is described as an index of 10 bits (1024 types). Terminal device which is set to I _CQI, using the _{I CQI} and the parameter table set, _{N P} and N
_OFFSET, acquires the _CQI, the obtained _{N P} and _{N OFFSET,} using _CQI W
-Determine subframes to report CQI and W-PMI;
Report I.

FIG. 9 shows an example of a parameter table related to RI reporting. Similar to the parameter table related to CQI reporting, the base station apparatus and the terminal apparatus share the parameter table in advance. The base station apparatus determines the M _RI and N _OFFSET from the RI period and offset value suitable for any terminal apparatus based on scheduling of feedback resources among a plurality of terminal apparatuses or transition of received power value for each terminal apparatus. _{, RI} is calculated, and I _RI corresponding to the calculated M _RI and N _{OFFSET, RI} using the parameter table
And set to the terminal device. Here, I _RI is described as an index of 10 bits (1024 types). Terminal device which is set to I _RI, using the _{I RI} and the parameter table _set, acquires _{M RI} and _{N OFFSET, RI,} acquired _{M RI} and _{N OFFSET,} obtained from _RI and _{I CQI} N _P and _{N OFFSET,} determines a subframe to report RI by using the _CQI, reports the RI.

Next, an extended feedback mode (second feedback mode) for reporting a plurality of partial precoder information PI will be described. Here, a case where partial precoder information 1 (PI1) and partial precoder information 2 (PI2) are reported as partial precoder information PI will be described. Further, in the extended feedback mode, the PMI in the backward compatible feedback mode does not need to be fed back, so the case where no PMI is fed back will be described below. Note that PMI may be fed back also in the extended feedback mode.

FIG. 10 is an example of a code book of partial precoder information according to the present embodiment. The size of this code book is 16, and W ¹ _i corresponding to _i is uniquely determined by specifying an index i that can be represented by 4 bits as PI1.

FIG. 11 is an example of a code book according to the present embodiment. The size of this codebook is 4, and W ² _j corresponding to _j is uniquely determined by designating an index j that can be represented by 2 bits as PI2.

Note that the code books shown in FIGS. 10 and 11 are examples, and other code books may be used. For example, a code book having a code book size different from the code book size shown in FIGS. 10 and 11 may be used.

In the extended feedback mode, a suitable precoder can be designated using W ¹ _i indicated by PI ¹ and W ² _j indicated by PI ² . Here, as a suitable precoder, for example, a precoder that increases downlink reception signal power, downlink reception quality, and downlink transmission rate in consideration of a downlink propagation path is adopted. Can do.

More specifically, the system determines that a suitable precoder F is expressed as F = A (i) B (j), and reports i as PI1 and j as PI2. Here, F is a matrix of the size of the number of layers × the number of antenna ports, and A and B are matrices of a predetermined size. However, the matrix here is a concept including a vector or a scalar. As A and B, for example, an arbitrary matrix uniquely determined by designating i and j as follows can be used.
(1) A (i) = W ¹ _i and B (j) = V ₁ + V ₂ W ² _j . Where V ₁ and V ₂
Predetermined matrix of 0 and 1 of the element, W _i matrix specified by the predetermined code book, phi _j
Is a scalar specified in a predetermined codebook.
(2) A (i) = W ¹ _i and B (j) = W ² _j . Here, W _i and Φ _j are matrices specified by a predetermined code book.
(3) A (i) = [W ¹ _i W ¹ _i ] and B (j) = W ² _j . Here, W _i and Φ _j are matrices specified by a predetermined code book.
(4) A (i) = K (U, W ¹ _i ), B (j) = [I W ² _j ^T ] ^T. Here, U is a predetermined matrix, I is a unit matrix, and W ¹ _i and W ² _j are matrices specified by a predetermined codebook. Further, K (X, Y) is the Kronecker product of the matrices X and matrices Y, ^{X T} is the matrix X
An operator representing the transpose matrix of

Thus, a suitable precoder expressed using PI1 and PI2 can also be expressed as a precoder that combines the precoder expressed by PI1 and the precoder expressed by PI2. Here, a case will be described in which the system decides F = A (i) B (j) as a combination of precoders, but F = B (i) A (j) or F
The same effect can be obtained even if other precoder combining methods are determined by the system, such as in the case of = K (A (i), B (j)).

FIG. 12 is a conceptual diagram of precoding processing according to the present embodiment. Here, a case where the number of antenna ports is 4, the number of layers is 2, and F = W ¹ _i W ² _j will be described. PI
The signal point at each antenna port of each layer is displaced (here, the phase is rotated in the range of 0 to 2π) by W ¹ _i which is a precoder represented by ¹ , and further, W ² _j which is a precoder represented by PI ² The signal point at each antenna port is displaced (here, the phase rotates in the range of 0 to 2π). The signal point displacement shown in FIG. 12 is an example, and the present invention is not limited to this.

When the terminal device first reports PI1, a suitable precoder (a signal point after applying the precoder is preferred) from a codebook consisting of a precoder group that gives a specific displacement to the signal point at each antenna port of each layer. Which is a precoder). Where PI
As a code book used to determine 1, a code book as shown in FIG. 10 is used. When the terminal device reports PI2 next time, it determines from the codebook a precoder for which the signal point after applying the precoder is suitable for the signal point after applying the precoder represented by the reported PI1, The index is reported as PI2. Here, a code book as shown in FIG. 11 is used as a code book for determining PI2. Alternatively, PI1 may be determined after determining PI2.

  Alternatively, the terminal device can determine PI1 and PI2 at the same time. PI1 and P
In various combinations of I2, W¹ _iAnd W² _jInvestigate the precoder that combines
If you determine the various combinations of PI1 and PI2 that represent a suitable precoder,
Good.

In the extended feedback mode, PI1 and PI2 in units of downlink bandwidth (or downlink component carrier bandwidth) can be reported, and reports in units of partial bandwidth can also be performed. Alternatively, PI1 in downlink bandwidth unit and PI2 in partial bandwidth unit can be reported. FIG. 13 shows an example of an RS for measuring PI. PI of downlink bandwidth unit using measurement result of RS arranged over wide band
1 is determined, and PI2 of the partial bandwidth unit is determined using the determined PI1 and the measurement result of the RS within the partial bandwidth.

FIG. 14 shows an example of a procedure according to this embodiment. The procedure shown in FIG. 14 is an example of the procedure in the extended feedback mode. First, the base station sets a feedback parameter in the terminal device via RRC signaling and instructs periodic feedback (step S1401). The terminal device instructed to perform periodic feedback performs RI (step S1402), PI1 (step S1403), PI2 (step S1404), WC according to the set feedback parameters.
Each QI (step S1405) is periodically reported to the base station apparatus. In the case of the extended feedback mode in which the S-CQI is fed back, the S-CQI is further periodically reported (step S1406). Here, feedback parameters are set in the terminal device in step S1401, and a periodic feedback instruction is set to RRC.
Although an example performed by signaling will be described, the present invention is not limited to this. For example, the same effect can be obtained by setting parameters or instructing periodic feedback by dynamic signaling via a downlink physical control channel.

Here, a subframe that reports W-CQI or S-CQI and a subframe that reports PI1 or PI2 or a subframe that reports RI may be the same subframe. In this case, RI>PI1>PI2>W-CQI> S-CQI, RI>
W-CQI>PI1>PI2> S-CQI, or RI>PI1>W-CQI> P
Priorities are assigned to the contents to be fed back, such as the order of I2> S-CQI, and the contents with high priority are reported. This makes it possible to uniquely determine which content is to be reported even when the reporting subframes overlap. Moreover, since priority can be given according to the importance of content, the content with high importance can be preferentially reported. Also, in R140 signaling in step 1401, RI
, PI1 or PI2 can be set not to be fed back. These settings may be individually set for RI, PI1, and PI2, or may be set collectively with one index.

FIG. 15 shows an example of the feedback mode according to the present embodiment. The feedback mode 1A shown in FIG. 15 is an extended feedback mode. In this feedback mode 1A, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, W-CQI and PI2 are fed back in a subframe satisfying Formula (1), RI is fed back in a subframe satisfying Formula (5), and PI1 is subtracted in a subframe satisfying Formula (6). give feedback.

Here, n _f is a system frame number assigned to each radio frame, and n _s is a slot number given to each slot in the radio frame. In _{addition, N P, M RI, N} OFFSET, C
_QI , N _{OFFSET, and RI} are values set in the terminal device by the base station device as described above. X is a value corresponding to whether the feedback mode is the extended feedback mode or the backward compatible feedback mode (a parameter indicating whether the feedback mode is the extended feedback mode or the back sense feedback mode), and is set to a value of 2 or 1 .

When X is set to 1, Equations (5) and (6) are both equivalent to Equation (2),
RI / W-CQI (W-PMI) parameter setting in feedback mode 1,
The RI (PI1) / W-CQI (PI2) parameter setting in the feedback mode 1A matches. At this time, PI1 may be transmitted simultaneously in a subframe in which RI is transmitted, or may not be transmitted. When X is set to 2, the RI transmission interval in the feedback mode 1 is doubled, and the PI1 is transmitted in an empty subframe. In this way, PI2 is reported instead of W-PMI in feedback mode 1 which is the backward compatible feedback mode, and RI and PI1 are reported using RI reporting resources in feedback mode 1. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. Furthermore, since the reporting periods of PI1 and PI2 can be set differently, it is possible to efficiently feed back partial precoder information in accordance with the role of each partial precoder information.

X can be set in the terminal device in step 1401 in FIG. Alternatively, it can be set in association with other parameters such as a transmission mode. For example, when the base station apparatus sets the extended transmission mode for the terminal apparatus, the terminal apparatus sets the value of X to 2, and when the backward compatible transmission mode is set, the terminal apparatus sets the value of X to 1, etc. What is necessary is just to process. This eliminates the need to individually specify X.

FIG. 16 shows an example of the feedback mode according to the present embodiment. The feedback mode 1B shown in FIG. 16 is an extended feedback mode. In this feedback mode 1B, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, the W-CQI is fed back in the subframe satisfying the formula (1), and the formula (
RI and PI1 are fed back in a subframe satisfying 5), and PI2 is fed back in a subframe satisfying Equation (6).

When X is set to 1, Equations (5) and (6) are both equivalent to Equation (2),
RI / W-CQI (W-PMI) parameter setting in feedback mode 1,
The RI (PI1, PI2) / W-CQI parameter settings in the feedback mode 1B coincide with each other. At this time, PI1 or PI2 may or may not be transmitted simultaneously in a subframe in which RI is transmitted. When X is set to 2, the RI reporting interval in feedback mode 1 is doubled, PI2 is reported in an empty subframe, and P
I1 is an extension that reports in the same subframe as RI. In this way, using the RI reporting resource in feedback mode 1 which is the backward compatible feedback mode, R
Report I, PI1, and PI2. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices.
Furthermore, since the amount of information of PI2 can be made larger than PI1 reported at the same time as RI, it is possible to efficiently feed back partial precoder information along the role of each partial precoder information.

FIG. 17 shows an example of the feedback mode according to the present embodiment. The feedback mode 1C shown in FIG. 17 is an extended feedback mode. In this feedback mode 1C, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, W-CQI and PI2 are fed back in a subframe satisfying Equation (7), RI is fed back in a subframe satisfying Equation (5), and PI1 is returned in a subframe satisfying Equation (8). give feedback.

When X is set to 1, both Equation (7) and Equation (8) are equivalent to Equation (2),
RI / W-CQI (W-PMI) parameter setting in feedback mode 1,
The RI / W-CQI (PI1, PI2) parameter setting in the feedback mode 1C matches. At this time, PI1 may be transmitted simultaneously in a subframe in which W-CQI is transmitted, or may not be transmitted. When X is set to 2, the W-CQI transmission interval in the feedback mode 1 is doubled, which is an extension in which PI1 is transmitted in an empty subframe. In this way, W-CQI, PI1, and PI2 are reported using the W-CQI or W-PMI report resource in feedback mode 1 that is the backward compatible feedback mode. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. In addition, RI
Compared to the above, since the reporting frequency of PI1 and PI2 can be increased, precoding processing along with channel fluctuation is possible.

FIG. 18 shows an example of the feedback mode according to the present embodiment. The feedback mode 1D shown in FIG. 18 is an extended feedback mode. In this feedback mode 1D, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, W-CQI is fed back in a subframe that satisfies Equation (7), and Equation (7
RI and PI1 are fed back in the subframe satisfying 5), and PI2 is fed back in the subframe satisfying Equation (8).

When X is set to 1, both Equation (7) and Equation (8) are equivalent to Equation (2),
RI / W-CQI (W-PMI) parameter setting in feedback mode 1,
The RI (PI1) / W-CQI (PI2) parameter setting in the feedback mode 1D matches. At this time, PI1 may be transmitted simultaneously in a subframe in which W-CQI is transmitted, or may not be transmitted. When X is set to 2, feedback mode 1
The W-CQI transmission interval is doubled, and the PI2 is transmitted in an empty subframe. Thus, RI and PI1 are reported using the RI reporting resource in the feedback mode 1 that is the backward compatible feedback mode, and W-CQI and W-PMI reporting resource in the feedback mode 1 are used. Report PI2. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. Furthermore, since the amount of PI2 information reported in one subframe can be increased, detailed partial precoder information can be reported.

FIG. 19 shows an example of the feedback mode according to the present embodiment. The feedback mode 2A shown in FIG. 19 is an extended feedback mode. In this feedback mode 2A, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI and PI2 are fed back in a subframe that satisfies Equation (3), RI is fed back in a subframe that satisfies Equation (9), and PI1 is returned in a subframe that satisfies Equation (10). give feedback.

When X is set to 1, both Equation (9) and Equation (10) are equivalent to Equation (4), and RI / W-CQI (W-PMI) / S-CQI parameter settings in feedback mode 2 , RI (PI1) / W-CQI (PI2) in feedback mode 2A
) • S-CQI parameter settings match. At this time, PI1 may be transmitted simultaneously in a subframe in which RI is transmitted, or may not be transmitted. When X is set to 2, the RI transmission interval in feedback mode 2 is doubled, and PI is used in the empty subframe.
1 is transmitted. Further, H = J · K + 1, and feedback mode 2
Similarly, in the feedback mode 2A, the CQI (S-CQI in the J BPs)
) Is repeated for K cycles. In this way, PI2 is reported instead of W-PMI in feedback mode 2 which is the backward compatible feedback mode, and RI and PI1 are reported using RI reporting resources in feedback mode 2. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. Furthermore, since the reporting periods of PI1 and PI2 can be set differently, it is possible to efficiently feed back partial precoder information in accordance with the role of each partial precoder information.

FIG. 20 shows an example of the feedback mode according to the present embodiment. The feedback mode 2B shown in FIG. 20 is an extended feedback mode. In this feedback mode 2B, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI is fed back in a subframe that satisfies Equation (3), RI and PI1 are fed back in a subframe that satisfies Equation (9), and PI2 is returned in a subframe that satisfies Equation (10). give feedback.

When X is set to 1, both Equation (9) and Equation (10) are equivalent to Equation (4), and RI / W-CQI (W-PMI) / S-CQI parameter settings in feedback mode 2 , RI (PI1, PI2) / W-CQI in feedback mode 2B
• The S-CQI parameter settings match. At this time, PI1 or PI2 may or may not be transmitted simultaneously in a subframe in which RI is transmitted. When X is set to 2, the RI transmission interval in the feedback mode 2 is doubled, and the PI2 is transmitted in an empty subframe. Further, H = J · K + 1, and the CQI in the J BPs in the feedback mode 2B as in the feedback mode 2.
Repeat (S-CQI) reporting for K cycles. In this way, RI, PI1, and P using the RI reporting resource in feedback mode 2 that is the backward compatible feedback mode.
Report I2. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. Furthermore, since the amount of information of PI2 can be made larger than PI1 reported at the same time as RI, it is possible to efficiently feed back partial precoder information along the role of each partial precoder information.

FIG. 21 shows an example of the feedback mode according to the present embodiment. The feedback mode 2C shown in FIG. 21 is an extended feedback mode. In this feedback mode 2C, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI and PI2 are fed back in a subframe that satisfies Equation (11), RI is fed back in a subframe that satisfies Equation (9), and PI1 is subtracted in a subframe that satisfies Equation (12). give feedback.

When X is set to 1, both Equation (11) and Equation (12) are equivalent to Equation (3), and RI / W-CQI (W-PMI) / S-CQI parameter settings in feedback mode 2 , RI / W-CQI (PI1, PI2 in feedback mode 2C)
) • S-CQI parameter settings match. At this time, PI1 may be transmitted simultaneously in a subframe in which W-CQI is transmitted, or may not be transmitted. When X is set to 2, the W-CQI transmission interval in the feedback mode 2 is doubled, which is an extension in which PI1 is transmitted in an empty subframe. Further, H = J · K + 1, and similarly to the feedback mode 2, the CQI in the J BPs in the feedback mode 2C.
Repeat (S-CQI) reporting for K cycles. However, in feedback mode 2C,
K cycles are repeated between the PI1 report and the W-CQI (PI2) report. From a different point of view, X and K cycles are repeated between W-CQI (PI2) reports. In this way, W-CQI, PI1, and PI using the W-CQI or W-PMI report resource in the feedback mode 2 that is the backward compatible feedback mode.
2 is reported. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. Further, since the reporting frequency of PI1 and PI2 can be increased as compared with RI, precoding processing can be performed along channel variations.

FIG. 22 shows an example of the feedback mode according to the present embodiment. The feedback mode 2D shown in FIG. 22 is an extended feedback mode. In this feedback mode 2D, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI is fed back in a subframe that satisfies Equation (11), RI and PI1 are fed back in a subframe that satisfies Equation (9), and PI2 is returned in a subframe that satisfies Equation (12). give feedback.

When X is set to 1, both Equation (11) and Equation (12) are equivalent to Equation (3), and RI / W-CQI (W-PMI) / S-CQI parameter settings in feedback mode 2 , RI (PI1) · W-CQI (PI in feedback mode 2C
2) The S-CQI parameter setting matches. At this time, PI2 may be transmitted at the same time in a subframe in which W-CQI is transmitted, or may not be transmitted. When X is set to 2, the W-CQI transmission interval in the feedback mode 2 is doubled, which is an extension of transmitting PI2 in an empty subframe. Further, H = J · K + 1, and similarly to the feedback mode 2, the CQ in the J BPs in the feedback mode 2D.
I (S-CQI) reporting is repeated K cycles. However, in feedback mode 2D, K cycles are repeated between the PI2 report and the W-CQI report. From a different point of view, X · K cycles are repeated between W-CQI reports. Thus, RI and PI1 are reported using the RI reporting resource in the feedback mode 2 that is the backward compatible feedback mode, and the W-CQI and W-PMI reporting resource in the feedback mode 2 are used. Report PI2. This
Uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. Furthermore, since the amount of PI2 information reported in one subframe can be increased, detailed partial precoder information can be reported.

FIG. 23 shows an example of the feedback mode according to the present embodiment. The feedback mode 1E shown in FIG. 23 is an extended feedback mode. In this feedback mode 1E, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, W-CQI is fed back in a subframe satisfying Equation (13), RI is fed back in a subframe satisfying Equation (14), and PI1 is fed back in a subframe satisfying Equation (15). , PI2 is fed back in the subframe satisfying Equation (16).

Here, X ₁ and X ₂ are values corresponding to the extended feedback mode or the backward compatible feedback mode, and are set to a value of 2 or 1.

When X ₁ and X ₂ are both set to 1, both Equation (13) and Equation (16) are equivalent to Equation (1), and Equation (14) and Equation (15) are both equivalent to Equation (2). And
RI / W-CQI (W-PMI) parameter setting in feedback mode 1,
The RI (PI1) / W-CQI (PI2) parameter setting in the feedback mode 1E matches. At this time, PI1 may be transmitted simultaneously in a subframe in which RI is transmitted, or may not be transmitted. Also, PI2 may be transmitted simultaneously in subframes for transmitting W-CQI or may not be transmitted. If X ₂ is set to 2, the transmission interval of the W-CQI in a feedback mode 1 is doubled, the expansion of sending the PI2 in empty subframe. When X ₁ is set to 2 and X ₂ is set to 1, the RI transmission interval in the feedback mode 1 is doubled, and the PI 1 is transmitted in an empty subframe. Furthermore, transmission case _{where X 1} and _{X 2} are both set to 2, 2 times the transmission interval of the W-CQI in a feedback mode 1, the transmission interval of the RI is quadrupled, the PI1 and PI2 at an idle sub-frame It is an extension that Thus, instead of W-PMI in feedback mode 1 which is a backward compatible feedback mode, PI2
And RI and PI1 are reported using the RI reporting resource in feedback mode 1. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. In addition, PI1 and PI
Since the two reporting periods can be set differently, it is possible to efficiently feed back partial precoder information in accordance with the role of each partial precoder information.

X ₁ or X ₂ can be set in the terminal device in step 1401 in FIG. X ₁ and X ₂ may be set individually, or X ₁ and X ₂ may always be set to the same value. Alternatively, it can be set in association with other parameters such as a transmission mode. For example, when the base station device sets the extended transmission mode to the terminal device,
When the terminal device sets the values of X ₁ and X ₂ to 2 and the backward compatible transmission mode is set, the terminal device may perform processing such as setting the values of X ₁ and X ₂ to 1. As a result, X ₁ or X
There is no need to specify ₂ individually.

FIG. 24 shows an example of the feedback mode according to the present embodiment. The feedback mode 2E shown in FIG. 24 is an extended feedback mode. In this feedback mode 2E, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI and PI1 are fed back in a subframe satisfying Equation (3), and RI is fed back in a subframe satisfying Equation (4). S-CQI and PI2 are reported alternately during the H · _{N P} subframe is a reporting period of the W-CQI. S-CQI and PI2 are reported by J · K times in a cycle of X · _{N P,} respectively. Here, H = X · J · K + 1. Each of the S-CQI or PI2 reported J / K times is a CQI or PI representing BP. CQIs or PIs in J BPs are alternately reported sequentially from CQIs or PIs in a low-frequency BP, and J reports are made each so as to cover the downlink bandwidth. In addition, J
By repeating times of reporting K cycle, reported by J · K times is performed in the period of H · N _P subframe.

When X is set to 1, RI · W-CQI in feedback mode 2 (WP
MI) · S-CQI parameter setting and RI · W-in feedback mode 2E
The parameter settings of CQI (PI1) and S-CQI (PI2) match. At this time, W
-PI1 may be transmitted simultaneously in the subframe which transmits CQI, or may not be transmitted. Also, PI2 may be transmitted simultaneously in subframes that transmit S-CQI, or may not be transmitted. W-CQI in feedback mode 2 when X is set to 2
The transmission interval from the _{(J · K + 1) N} P (2 · J · K + 1) becomes _{N P,} the extension of transmitting the PI2 in empty subframe. In this way, PI1 is reported instead of W-PMI in feedback mode 2 which is the backward compatible feedback mode, and S-CQI and PI2 are reported using the resource of S-CQI reporting in feedback mode 2. Thereby, the uplink overhead required for reporting can be reduced. Also,
It is possible to reduce the collision of reports of different terminal devices. Furthermore, since the reporting periods of PI1 and PI2 can be set differently, it is possible to efficiently feed back partial precoder information in accordance with the role of each partial precoder information. Further, since many reporting opportunities can be scheduled for PI2, it is suitable for reporting PI2 in BP units.

FIG. 25 shows an example of the feedback mode according to the present embodiment. The feedback mode 2F shown in FIG. 25 is an extended feedback mode. In this feedback mode 2F, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI is fed back in a subframe that satisfies Equation (3), and RI is fed back in a subframe that satisfies Equation (17).
PI1 is fed back in the subframe satisfying the above. S-CQI and PI2
Is reported alternately during the H · N _P subframe is a reporting period of the W-CQI. S-
CQI and PI2 are reported by J · K times in a cycle of _X 2 · _{N P,} respectively. here,
H = X ₂ · J · K + 1. Each of the S-CQI or PI2 reported J / K times is a CQI or PI representing BP. CQI or PI in J BPs
Are sequentially reported from CQI or PI in the BP having a low frequency, and J reports are made each so as to cover the downlink bandwidth. Further, by repeating K cycle J times of reporting, reporting by J · K times it is performed in the period of H · N _P subframe.

When both X ₁ and X ₂ are set to 1, both Equation (17) and Equation (18) are equivalent to Equation (4), and RI · W-CQI (W-PMI) in feedback mode 1
) • S-CQI parameter setting and RI (PI1) in feedback mode 2E
-The parameter settings of W-CQI and S-CQI (PI2) match. At this time, PI1 may be transmitted simultaneously in a subframe in which RI is transmitted, or may not be transmitted. Also,
PI2 may be transmitted simultaneously in subframes for transmitting S-CQI, or may not be transmitted. If X ₂ is set to 2, the transmission interval of the W-CQI in a feedback mode 2 from _{(J · K + 1) N} P (2 · J · K + 1) becomes _{N P,} PI with empty subframe
2 is transmitted. Also, if X ₁ is 2, X ₂ is set to 1, the transmission interval of the RI in the feedback mode 2 is doubled, the expansion of sending the PI1 in empty subframe. Furthermore, _{when X 1} and _{X 2} are both set to 2, the transmission interval of the W-CQI in a feedback mode 2 (J · K + 1) from the _{N P} (2 · J · K
+1) becomes _{N P,} the transmission interval of the RI _{(J · K + 1) N} P · M 2 · from _RI (2 · J · K
+1) N _P · M _RI , which is an extension of transmitting PI1 and PI2 in empty subframes. Thus, feedback mode 2 which is a backward compatible feedback mode
RI and PI1 are reported using the resource reporting RI in S, and S-CQI and PI2 are reported using the resource of S-CQI reporting in feedback mode 2. Thereby, the uplink overhead required for reporting can be reduced. In addition, it is possible to reduce the collision of reports of different terminal devices. Furthermore, since the reporting periods of PI1 and PI2 can be set differently, it is possible to efficiently feed back partial precoder information in accordance with the role of each partial precoder information. Further, since many reporting opportunities can be scheduled for PI2, it is suitable for reporting PI2 in BP units.

X ₁ or X ₂ can be set in the terminal device in step 1401 in FIG. X ₁ and X ₂ may be set individually, or X ₁ and X ₂ may always be set to the same value. Alternatively, it can be set in association with other parameters such as a transmission mode. For example, when the base station device sets the extended transmission mode to the terminal device,
When the terminal device sets the values of X ₁ and X ₂ to 2 and the backward compatible transmission mode is set, the terminal device may perform processing such as setting the values of X ₁ and X ₂ to 1. As a result, X ₁ or X
There is no need to specify ₂ individually.

In this way, the base station apparatus sets the backward compatible feedback mode for feeding back the precoding matrix or the extended feedback mode for feeding back a plurality of partial precoder information to the terminal apparatus. At this time, the parameters related to the period and offset value in the extended feedback mode are made the same as those in the backward compatible feedback mode. Further, the content to be fed back (RI, PI) is calculated by a mathematical formula that introduces a parameter corresponding to whether it is the extended feedback mode or the backward compatible feedback mode.
1, PI 2, W-CQI, etc.), a subframe to be reported is determined.
Also, when reporting partial precoder information, R in backward compatible feedback mode
Report PI on some of the resources reporting I or CQI. In addition, RI or C
Report QI and PI alternately. Thereby, it is possible to easily switch between the extended feedback mode and the backward compatible feedback mode. Moreover, the overhead of signaling from the base station apparatus to the terminal apparatus can be reduced. Further, any content can be reported at an appropriate cycle.

(Second Embodiment)
In the first embodiment, the case has been described in which the parameters related to the period and the offset value in the extended feedback mode are the same as those in the backward compatible feedback mode.
In the second embodiment of the present invention, a case where a parameter related to an offset value in the extended feedback mode is different from that in the backward compatible feedback mode will be described. The second embodiment of the present invention will be described below with reference to the drawings. Note that the procedure between the base station apparatus and the terminal apparatus according to the present embodiment can be realized by a procedure similar to the procedure shown in FIG.

FIG. 26 shows an example of the feedback mode according to the present embodiment. The feedback mode 1F shown in FIG. 26 is an extended feedback mode. In this feedback mode 1F, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, W-CQI and PI2 are fed back in a subframe that satisfies Equation (1), RI is fed back in a subframe that satisfies Equation (2), and PI1 is returned in a subframe that satisfies Equation (19). give feedback.

Here, N _{OFFSET and PI} are predetermined values.

In feedback mode 1F shown in FIG. 26, W-CQI and PI2 are in a cycle of _{N P} subframe, _{N OFFSET} subframes as a _reference, shifted by _CQI (is offset) it is reported in subframe. RI is M of the period of W-CQI.
In the period of _N P · _{M RI} is _RI fold, _{N OFFSET} subframes as a _{reference, CQ
I} + N _OFFSET, reported in a subframe shifted by _RI , that is, a subframe further shifted from W-CQI by N _{OFFSET, RI} . Furthermore, PI1 is P
As with I, at a period of the same period as the _{RI N P · M RI, N} OFFSET subframes as a _{reference, CQI + N OFFSET, RI +} N OFFSET, PI shifted subframes, i.e. further _{N OFFSET} from _RI, Reported in subframes shifted by _PI .

FIG. 27 shows an example of a parameter table related to PI reporting. CQI
Alternatively, the parameter table shown in FIG. 8 or 9 is used as the RI parameter table. The base station apparatus and the terminal apparatus share a parameter table in advance. The base station apparatus can perform W-CQI, PI, RI suitable for an arbitrary terminal apparatus based on scheduling of feedback resources among a plurality of terminal apparatuses or transition of received power value for each terminal apparatus.
_{N P} and _N OFFSET from the period and offset _{value, CQI, N OFFSET, R
I, N OFFSET,} calculates a _PI, using the parameter table, the calculated _{N P} and _{N OFFSET, CQI, N OFFSET,} RI, N OFFSET, I corresponds to the _{PI C
QI} , I _RI , and I _PI (second parameter indicating an offset of timing for reporting partial precoder information) are selected and set in the terminal device. The terminal device set with I _CQI , I _RI , I _PI uses the set I _CQI , I _RI , I _PI and the parameter table,
N _P and _{N OFFSET, CQI, N OFFSET,} RI, N OFFSET, obtains the _PI, obtained _{N P} and _{N OFFSET, CQI, N OFFSET,} RI, N OFFS
A subframe for reporting W-CQI, PI, and RI is determined using _{ET and PI} .

Note that N _{OFFSET and PI} can be set in the terminal device in step 1401 in FIG. Alternatively, it can be set in association with other parameters such as a transmission mode, or can be fixed.

Thus, W-PM in feedback mode 1 which is a backward compatible feedback mode.
PI2 is reported instead of I, and a parameter related to the offset value of PI1 is set separately from the parameter in feedback mode 1. Thereby, the content fed back in the feedback mode 1 can be fed back with the same period or offset value even in the extended feedback mode. Further, by making the period of PI1 the same as that of RI, it is possible to reduce collision of reports of different contents.

FIG. 28 shows an example of the feedback mode according to the present embodiment. The feedback mode 1G shown in FIG. 28 is an extended feedback mode. In this feedback mode 1G, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, the W-CQI is fed back in the subframe satisfying the formula (1), and the formula (
RI and PI1 are fed back in the subframe satisfying 2), and PI2 is fed back in the subframe satisfying Equation (19).

In feedback mode 1G shown in FIG. 28, W-CQI is the period of the _{N P} subframe, _{N OFFSET} subframes as a _reference, are reported in subframe shifted by _CQI. Further, RI and PI1 is an _{M RI} times the period of the W-CQI _N P · M
_In the period of _RI , N _{OFFSET, CQI} + N _OFFSET from the reference subframe _,
Subframe shifted by _RI , that is, N _{OFFSET, RI} from W-CQI
Only reported in shifted subframes. Furthermore, PI2 is N which is the same cycle as RI.
N _{OFFSET, CQI} + N _OFFS from the reference subframe in the period of _P · M _RI
Subframe shifted by _{ET and PI} , that is, N _OFFSET from W-CQI
_{, Are} reported in subframes shifted by _PI .

In this way, RI and PI1 are reported using the resource for reporting the RI in feedback mode 1 which is the backward compatible feedback mode, and the parameter related to the offset value of PI2 is set separately from the parameter in feedback mode 1. . Thereby, the content fed back in the feedback mode 1 can be fed back with the same period or offset value even in the extended feedback mode. Also, by making the PI2 cycle the same as RI, it is possible to reduce the collision of reports of different contents.

FIG. 29 shows an example of the feedback mode according to the present embodiment. The feedback mode 2G shown in FIG. 29 is an extended feedback mode. In this feedback mode 2G, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI and PI2 are fed back in a subframe that satisfies Equation (3), RI is fed back in a subframe that satisfies Equation (4), and PI1 is returned in a subframe that satisfies Equation (20). give feedback.

In the feedback mode 2G shown in FIG. 29, W-CQI and PI2 are H · N _P
It is reported in a subframe shifted by N _{OFFSET and CQI} from the reference subframe in the subframe period. Further, RI is _{M RI} times the period of the W-CQI _{N P}
· _M in the cycle of _{RI, N} OFFSET subframes as a _{reference, CQI + N OFFSE}
Subframes shifted by _{T and RI} , that is _, N _OFFSET from W-CQI _,
Reported in subframes shifted by _RI . Furthermore, PI1 is W-
N _P · M _RI period, which is M _RI times the CQI period, and N _O from the reference subframe
_{FFSET, CQI} + N _{OFFSET, RI} + N _OFFSET, a subframe shifted by _PI , that is, a subframe further shifted from RI by N _{OFFSET, PI} is reported. Further, H = J · K + 1, and similarly to the feedback mode 2, the CQI (S-CQI) reporting in the J BPs is repeated K cycles in the feedback mode 2G.

Thus, the W-PM in the feedback mode 2 which is the backward compatible feedback mode.
PI2 is reported using a resource that reports I, and a parameter related to the offset value of PI1 is set separately from the parameter in feedback mode 2. Thereby, the content fed back in the feedback mode 2 can be fed back with the same period or offset value even in the extended feedback mode. Further, by making the period of PI1 the same as that of RI, it is possible to reduce collision of reports of different contents.

FIG. 30 shows an example of the feedback mode according to the present embodiment. The feedback mode 2H shown in FIG. 30 is an extended feedback mode. In this feedback mode 2H, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI is fed back in a subframe that satisfies Equation (3), RI and PI1 are fed back in a subframe that satisfies Equation (4), and PI2 is returned in a subframe that satisfies Equation (20). give feedback.

In feedback mode 2H shown in Figure 30, W-CQI is the period of the H · _{N P} subframes, _{N OFFSET} subframes as a _reference, are reported in subframe shifted by _CQI. Further, RI and PI2 are _{M RI} times the period of the W-CQI _{N P}
· _M in the cycle of _{RI, N} OFFSET subframes as a _{reference, CQI + N OFFSE}
Subframes shifted by _{T and RI} , that is _, N _OFFSET from W-CQI _,
Reported in subframes shifted by _RI . Furthermore, PI2 is W-
N _P · M _RI period, which is M _RI times the CQI period, and N _O from the reference subframe
_{FFSET, CQI} + N _{OFFSET, RI} + N _OFFSET, a subframe shifted by _PI , that is, a subframe further shifted from RI by N _{OFFSET, PI} is reported. Further, H = J · K + 1, and similarly to the feedback mode 2, the CQI (S-CQI) reporting in the J BPs is repeated K cycles in the feedback mode 2H.

In this way, RI and PI1 are reported using the resource for reporting the RI in feedback mode 2 which is the backward compatible feedback mode, and the parameter relating to the offset value of PI2 is set separately from the parameter in feedback mode 2. . Thereby, the content fed back in the feedback mode 2 can be fed back with the same period or offset value even in the extended feedback mode. Also, by making the PI2 cycle the same as RI, it is possible to reduce the collision of reports of different contents.

FIG. 31 shows an example of the feedback mode according to the present embodiment. The feedback mode 1H shown in FIG. 31 is an extended feedback mode. In this feedback mode 1H, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, W-CQI and PI2 are fed back in a subframe that satisfies Equation (1), RI is fed back in a subframe that satisfies Equation (2), and PI1 is returned in a subframe that satisfies Equation (21). give feedback.

In feedback mode 1H shown in FIG. 31, W-CQI and PI2 are in a cycle of _{N P} subframe, _{N OFFSET} subframes as a _reference, are reported in subframe shifted by _CQI. Further, RI is _{M RI} times the period of the W-CQI _N P · M
_In the period of _RI , N _{OFFSET, CQI} + N _OFFSET from the reference subframe _,
Subframe shifted by _RI , that is, N _{OFFSET, RI} from W-CQI
Only reported in shifted subframes. Furthermore, PI1 is, W-CQI and with a period of _{N P} is the same period, _N OFFSET subframes as a _{reference, CQI + N OFFSE}
Subframe shifted by _{T and PI} , that is _, N _OFFSET from W-CQI _,
Reported in subframes shifted by _PI .

Thus, W-PM in feedback mode 1 which is a backward compatible feedback mode.
PI2 is reported using a resource that reports I, and a parameter related to the offset value of PI1 is set separately from the parameter in feedback mode 1. Thereby, the content fed back in the feedback mode 1 can be fed back with the same period or offset value even in the extended feedback mode. Also, by making the period of PI1 the same as W-CQI, it is possible to reduce collision of reports of different contents.

FIG. 32 shows an example of the feedback mode according to the present embodiment. The feedback mode 1I shown in FIG. 32 is an extended feedback mode. In this feedback mode 1I, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, the W-CQI is fed back in the subframe satisfying the formula (1), and the formula (
RI and PI1 are fed back in the subframe satisfying 2), and PI2 is fed back in the subframe satisfying Equation (21).

In feedback mode 1I shown in FIG. 32, W-CQI and PI2 are in a cycle of _{N P} subframe, _{N OFFSET} subframes as a _reference, are reported in subframe shifted by _CQI. Also, RI and PI1 are N _P · M _RI periods that are M _RI times the W-CQI period, and N _{OFFSET, CQI} + N _O from the reference subframe
_FFSET, subframe shifted by _RI , that is, N _OFF from W-CQI
Reported in subframes shifted by _{SET and RI} . Furthermore, PI2 is W-CQI.
And in a cycle of _{N P} is the same period, _{N OFFSET} subframes as a _{reference, CQI} +
N _OFFSET, subframe shifted by _PI , that is, N _O from W-CQI
_{Reported in} subframes shifted by _{FFSET and PI} .

In this way, RI and PI1 are reported using the resource for reporting the RI in feedback mode 1 which is the backward compatible feedback mode, and the parameter related to the offset value of PI2 is set separately from the parameter in feedback mode 1. . Thereby, the content fed back in the feedback mode 1 can be fed back with the same period or offset value even in the extended feedback mode. Also, by making the PI2 cycle the same as that of W-CQI, it is possible to reduce the collision of reports of different contents.

FIG. 33 shows an example of the feedback mode according to the present embodiment. The feedback mode 2I shown in FIG. 33 is an extended feedback mode. In this feedback mode 2I, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI and PI2 are fed back in a subframe satisfying Equation (3), RI is fed back in a subframe satisfying Equation (4), and PI1 is assigned in a subframe satisfying Equation (22). give feedback. H = J · K
+1, and in feedback mode 2I as well as in feedback mode 2, J
The CQI (S-CQI) reporting in each BP is repeated K cycles.

In feedback mode 2I shown in FIG. 33, W-CQI and PI2 are H · N _P
It is reported in a subframe shifted by N _{OFFSET and CQI} from the reference subframe in the subframe period. RI is M · _RI which is _MRI times the period of W-CQI.
In the period of _{N P} · _{M RI,} N _OFFSET subframes as a reference, CQI _{+ N OFF}
Subframe shifted by _{SET, RI} , ie, N _OFFSE from W-CQI
Reported in subframes shifted by _{T and RI} . Furthermore, PI1 is the period of the H · _{N P} is the same period as the W-CQI, _{N OFFSET} subframes as a _{reference, CQI} +
N _OFFSET, subframe shifted by _PI , that is, N _O from W-CQI
_{Reported in} subframes shifted by _{FFSET and PI} .

Thus, the W-PM in the feedback mode 2 which is the backward compatible feedback mode.
PI2 is reported using a resource that reports I, and a parameter related to the offset value of PI1 is set separately from the parameter in feedback mode 2. Thereby, the content fed back in the feedback mode 2 can be fed back with the same period or offset value even in the extended feedback mode. Also, by making the period of PI1 the same as W-CQI, it is possible to reduce collision of reports of different contents.

FIG. 34 shows an example of the feedback mode according to the present embodiment. The feedback mode 2J shown in FIG. 34 is an extended feedback mode. In this feedback mode 2J, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI is fed back in a subframe that satisfies Equation (3), RI and PI1 are fed back in a subframe that satisfies Equation (4), and PI2 is returned in a subframe that satisfies Equation (22). give feedback. H = J · K
+1, and in feedback mode 2J as well as in feedback mode 2, J
The CQI (S-CQI) reporting in each BP is repeated K cycles.

In feedback mode 2J shown in FIG. 34, W-CQI is the period of the H · _{N P} subframes, _{N OFFSET} subframes as a _reference, are reported in subframe shifted by _CQI. Also, RI and PI1 are H · _RI, which is M _RI times the period of W-CQI.
In the period of _{N P} · _{M RI,} N _OFFSET subframes as a reference, CQI _{+ N OFF}
Subframe shifted by _{SET, RI} , ie, N _OFFSE from W-CQI
Reported in subframes shifted by _{T and RI} . Furthermore, PI2 is at a period of H · _{N P} is the same period as the W-CQI, _{N OFFSET} subframes as a _{reference, CQI} +
N _OFFSET, subframe shifted by _PI , that is, N _O from W-CQI
_{Reported in} subframes shifted by _{FFSET and PI} .

In this way, RI and PI1 are reported using the resource for reporting the RI in feedback mode 2 which is the backward compatible feedback mode, and the parameter relating to the offset value of PI2 is set separately from the parameter in feedback mode 2. . Thereby, the content fed back in the feedback mode 2 can be fed back with the same period or offset value even in the extended feedback mode. Also, by making the PI2 cycle the same as that of W-CQI, it is possible to reduce the collision of reports of different contents.

FIG. 35 shows an example of the feedback mode according to the present embodiment. The feedback mode 2K shown in FIG. 35 is an extended feedback mode. In this feedback mode 2K, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI is fed back in a subframe satisfying Equation (3), RI is fed back in a subframe satisfying Equation (4), and Equation (20)
PI1 is fed back in a subframe that satisfies S-CQI and PI2 are reported by J · K times in a cycle of X · _{N P,} respectively. Here, H = X · J · K + 1. Each S-CQI or PI2 reported J / K times is a CQI representing BP.
Or it is PI. CQIs or PIs in J BPs are alternately reported sequentially from CQIs or PIs in a low-frequency BP, and J reports are made each so as to cover the downlink bandwidth. Furthermore, by repeating J reports for K cycles, H ·
Report of each J · K times is carried out in the period of the N _P sub-frame.

In feedback mode 2K shown in FIG. 35, W-CQI is the period of the H · _{N P} subframes, _{N OFFSET} subframes as a _reference, are reported in subframe shifted by _CQI. Further, RI is _{M RI} times the period of the _{W-CQI H · N P ·} M RI
N _{OFFSET, CQI} + N _{OFFSET, RI} from the reference subframe
_Is reported in a subframe that is shifted by only N _{OFFSET, RI} from the W-CQI. Furthermore, PI1 is the same period as RI and H · N
N _{OFFSET, CQI} + N _OFFS from the reference subframe in the period of _P · M _{RI
ET, RI} + N _OFFSET, a subframe shifted by _PI , that is, a subframe further shifted from RI by N _{OFFSET, PI} is reported.

Thus, S-CQ of feedback mode 2 which is a backward compatible feedback mode
S-CQI and PI2 are reported using a resource that reports I, and a parameter related to the offset value of PI1 is set separately from the parameter in feedback mode 2. Thereby, the content fed back in the feedback mode 2 can be fed back with the same period or offset value even in the extended feedback mode. Further, by making the period of PI1 the same as that of RI, it is possible to reduce collision of reports of different contents.

FIG. 36 shows an example of the feedback mode according to the present embodiment. The feedback mode 2L shown in FIG. 36 is an extended feedback mode. In this feedback mode 2L, RI, PI1, PI2, W-CQI, and S-CQI are periodically reported.
More specifically, W-CQI and PI1 are fed back in a subframe satisfying Equation (3), and RI is fed back in a subframe satisfying Equation (4). S-CQI and PI2 are reported by J · K times in a cycle of _{N P,} respectively. here,
H = J · K + 1. Each S-CQI or PI2 reported J / K times is B
CQI or PI representing P. CQIs or PIs in J BPs are sequentially reported from CQIs or PIs in BPs having a low frequency, and J reports are made to cover the downlink bandwidth. Further, by repeating K cycle J times of reporting, reporting by J · K times it is performed in the period of H · N _P subframe.

In feedback mode 2L shown in FIG. 36, W-CQI and PI1 are H · N _P
It is reported in a subframe shifted by N _{OFFSET and CQI} from the reference subframe in the subframe period. RI is M · _RI which is _MRI times the period of W-CQI.
In the period of _{N P} · _{M RI,} N _OFFSET subframes as a reference, CQI _{+ N OFF}
Subframe shifted by _{SET, RI} , ie, N _OFFSE from W-CQI
Reported in subframes shifted by _{T and RI} . Furthermore, PI2 is at a period of _{N P} is the same period as the S-CQI, _{N OFFSET} subframes Report _{S-CQI, P}
Reported in subframes shifted by _I.

Thus, the W-PM in the feedback mode 2 which is the backward compatible feedback mode.
PI1 is reported using a resource for reporting I, and a parameter related to the offset value of PI2 is set separately from the parameter in feedback mode 2. Thereby, the content fed back in the feedback mode 2 can be fed back with the same period or offset value even in the extended feedback mode. In addition, by making the PI2 cycle the same as that of the S-CQI, it is possible to reduce collision of reports of different contents.

FIG. 37 shows an example of the feedback mode according to the present embodiment. The feedback mode 1J shown in FIG. 37 is an extended feedback mode. In this feedback mode 1J, RI, PI1, PI2, and W-CQI are periodically reported. More specifically, the W-CQI is fed back in the subframe satisfying the formula (1), and the formula (
RI is fed back in a subframe satisfying 2), PI1 is fed back in a subframe satisfying Equation (23), and PI2 is fed back in a subframe satisfying Equation (24).

Here, N _{OFFSET, PI1} and N _{OFFSET, PI2} are predetermined values.

In feedback mode 1J shown in FIG. 37, W-CQI is the period of the _{N P} subframe, _{N OFFSET} subframes as a _reference, it is reported in subframe shifted by _CQI. Further, RI is the _N P · _{M RI} cycle of a _{M RI} times the period of the W-CQI, serving as a reference sub-frame _{N OFFSET, CQI + N OFFSET,} RI shifted subframes, i.e. from W-CQI Furthermore, it is reported in a subframe shifted by N _{OFFSET, RI} . Further, PI1 is the period of the same period as the RI _N P · _{M RI,} serving as a reference sub-frame _{N OFFSET, CQI + N OFFSET,} subframe shifted by _RI, i.e. further only _{N OFFSET, PI1} from RI shift Are reported in subframes. Furthermore, PI2 is at a period of _{N P} is the same period as the W-CQI, from the sub-frame as a reference _{N OFFSET,} subframe shifted by _{CQI + N OFFSET, PI2,} i.e. further _{N OFFSET, PI2} only from W-CQI Reported in shifted subframes.

N _{OFFSET, PI1} and N _{OFFSET, PI2} can be set in the terminal device in step 1401 in FIG. Alternatively, it can be set in association with other parameters such as a transmission mode, or can be fixed.

In this way, a parameter related to the offset value of PI1 or PI2 is set separately from the parameter in feedback mode 1 which is the backward compatible feedback mode.
Thereby, the content fed back in the feedback mode 1 can be fed back with the same period or offset value even in the extended feedback mode. Further, by making the periods of PI1 and PI2 the same as those of RI and W-CQI, it is possible to reduce the collision of reports of different contents.

Further, it may be switched between the extended feedback mode and the backward compatible feedback mode depending on whether or not the _IPI is set. For example, in the RRC signaling 1401 in FIG. 14, when I _PI is set, the terminal device feeds back using the extended feedback mode, and when I _PI is not set, the terminal device uses the backward compatible feedback mode. Feedback.

In this way, the base station apparatus sets the backward compatible feedback mode for feeding back the precoding matrix or the extended feedback mode for feeding back a plurality of partial precoder information to the terminal apparatus. At this time, the parameter related to the period in the extended feedback mode is made the same as that in the backward compatible feedback mode, and the offset value in the partial precoder information is set separately from the offset value in the backward compatible feedback mode. Thereby, it is possible to easily switch between the extended feedback mode and the backward compatible feedback mode. In addition, it is possible to reduce collision of reports of different contents.

(Third embodiment)
In the first embodiment and the second embodiment described above, the case where the reception quality information in one downlink component carrier is reported has been described. In the third embodiment of the present invention, a case where reception quality information in a plurality of downlink component carriers is reported will be described. The third embodiment of the present invention will be described below with reference to the drawings.

FIG. 38 shows an example of a component carrier configuration according to this embodiment. Here, the terminal device is connected to cells (Cell # 0, Cell # 1, Cell # 2) covered by three different downlink component carriers, and three downlinks (Cell # 0-DL). , Cell # 1-DL, Cell # 2-DL) will be described on the case where the reception quality information is reported by one uplink (Cell # 1-UL).

FIG. 39 shows an example of a procedure according to this embodiment. The procedure shown in FIG. 39 is an example of the procedure in the extended feedback mode. First, the base station sets a feedback parameter in a terminal device in each cell via RRC signaling, and instructs periodic feedback in each cell (
Step S3901). Here, Cell # 0-DL, Cell # 1-DL, Cell
A case will be described where periodic feedback is instructed in three downlinks of # 2-DL. The parameter of feedback in the terminal device in each cell is
The parameters shown in FIG. 8, FIG. 9 or FIG. 27 can be used. Cell # 1-D
The terminal device instructed to perform periodic feedback in L sets the set parameter (C
In accordance with I _CQI , I _RI , I _{PI in} cell # 1-DL, RI in cell # 1-DL (step S3902), PI1 in cell # 1-DL (step S390)
3) PI2 in Cell # 1-DL (step S3904), Cell # 1-DL
W-CQI (step S3905) is periodically reported to the base station apparatus.
In the case of the extended feedback mode that feeds back S-CQI, Cell #
The S-CQI in 1-DL is periodically reported (step S3906). Similarly,
Terminal device is instructed to periodic feedback in Cell # 0-DL is set parameters _(I CQI in _{Cell # 0-DL, I RI} , I PI) according Cell
RI in # 0-DL (step S3907), PI1 in Cell # 0-DL (
Step S3908), PI2 in Cell # 0-DL (Step S3909), C
W-CQI (step S3910) in cell # 0-DL is periodically reported to the base station apparatus. In the case of an extended feedback mode that feeds back S-CQI,
Further, S-CQI in Cell # 0-DL is periodically reported (step S3911).
). Further, the terminal device instructed to perform periodic feedback in Cell # 2-DL, the RI in Cell # 2-DL according to the set parameters ( _ICQI , I _RI , I _{PI in} Cell # 2-DL) (step S3912), PI1 in Cell # 2-DL (step S3913), PI2 in Cell # 2-DL (step S3)
914) and W-CQI (step S3915) in Cell # 2-DL is periodically reported to the base station apparatus. In the extended feedback mode in which the S-CQI is fed back, the S-CQI in Cell # 2-DL is further periodically reported (step S3916).

Here, I _CQI , I _RI , I _PI in Cell # 0-DL and Cell # 1-D
_I CQI in _{L, I RI,} I _PI and, Cell # _I CQI in _{2-DL, I RI}
, _IPI can be set to take different values. Alternatively, any of the parameters may be determined so as to be common to a plurality of cells, and the parameters common to the cells may be set.

Also, subframes that report W-CQI or S-CQI in multiple cells and P
In some cases, the subframe reporting I1 or PI2 or the subframe reporting RI is the same subframe. In this case, RI>PI1>PI2>W-CQI> SC
In order of QI, RI>W-CQI>PI1>PI2> S-CQI or RI>PI1> W
Prioritize the content to be fed back, such as the order of -CQI>PI2> S-CQI, and report the content with high priority. As a result, across multiple cells,
Even when the subframes to be reported overlap, it is possible to uniquely determine which content is to be reported. In addition, since priority can be given according to the importance of content across a plurality of cells, content with high importance can be preferentially reported. Alternatively, priorities are assigned to the cells to be fed back in the order of Cell # 1> Cell # 0> Cell # 2, and the contents of the cells with high priority are reported. This makes it possible to uniquely determine which content is to be reported even when the reporting subframes overlap across a plurality of cells. Alternatively, priority can be given in consideration of both the cell and the content.

Alternatively, when the base station apparatus sets parameters such as I _CQI , I _RI , and I _PI for the terminal apparatus, the base station apparatus sets a parameter set that reduces report collisions between component carriers. Also good. For example, when a value from 7 to 316 is set as the I _CQI in one component carrier in the table shown in FIG. 8, a value from 0 to 316 is set as the I _CQI in the other component carrier, and 318 to 541 are set.
It is sufficient not to set the values up to. Conversely, when a value of 318 to 541 is set as the I _CQI in one component carrier, a value of 0 to 1 or 318 to 541 is set as the I _CQI in the other component carrier, and a value from 2 to 6 Should not be set. More preferably, a value from 2 to 316 is not set. In this way, by setting the prime factors of the periods in a plurality of component carriers to be common, it is possible to reduce report collisions between the component carriers. Further, the amount of information required for setting parameters in a plurality of component carriers may be reduced using this restriction.

Also, in the RRC signaling in step 3901, the RI in each cell
, PI1 or PI2 can be set not to be fed back. These settings may be individually set for RI, PI1, and PI2, or may be set collectively with one index. Moreover, it may be set individually for each cell or may be set commonly for each cell.

Further, the RRC signaling in step 3901 may set the cell individually for the extended feedback mode or the backward compatible feedback mode. For example, by setting X (or X ₁ , X ₂ ) described in the first embodiment or I _PI described in the second embodiment for each cell, it is possible to determine whether the extended feedback mode or the backward compatible feedback mode is set. It can be set for each cell. Alternatively, the extended feedback mode or the backward compatible feedback mode may be set commonly for the cells. For example, by setting X (or X ₁ , X ₂ ) described in the first embodiment or I _PI described in the second embodiment in common to cells, it is possible to determine whether the extended feedback mode or the backward compatible feedback mode is set. It can be set for all cells. A cell with the extended feedback mode set is R
W-PMI may be reported instead of I1 and RI2.

Here, three downlinks (Cell # 0-DL, Cell # 2-DL, Cel
Although the case where the reception quality information in l # 3-DL) is reported by one uplink (Cell # 1-UL) has been described, the present invention is not limited to this. For example, when reporting reception quality information on any number of downlink component carriers regardless of the number of uplink component carriers used for reporting, such as when reporting reception quality information on four downlinks with two uplinks On the other hand, the present invention can be similarly applied.

Thus, the base station apparatus sets a backward compatible feedback mode for feeding back a precoding matrix or an extended feedback mode for feeding back a plurality of partial precoder information to a terminal apparatus in a plurality of downlink component carriers. At this time, an offset value in the backward compatible feedback mode is set as a parameter related to the period in the extended feedback mode in each downlink component carrier or an offset value in the partial precoder information. This
In a plurality of downlink component carriers, the extended feedback mode and the backward compatible feedback mode can be easily switched. Also, reporting conflicts for different component carriers can be reduced.

(Fourth embodiment)
In the third embodiment, a case has been described in which reception quality information in a plurality of downlink component carriers is reported. In the fourth embodiment of the present invention, a case will be described in which reception quality information related to a plurality of downlink transmission points (for example, a base station device, a remote radio transmission device, a relay device, a small base station device, etc.) is reported. Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 40 shows an example of a transmission point configuration according to the present embodiment. Here, the terminal device
Receiving quality is measured in cells (Cell # 0, Cell # 1, Cell # 2) covered by three different transmission points (transmission point 0, transmission point 1, transmission point 2), and Link (Cell # 0-DL, Cell # 1-DL, Cell # 2-DL)
A case will be described where the reception quality information in is reported on one uplink (Cell # 1-UL).

As the procedure according to the present embodiment, a procedure similar to the procedure shown in FIG. 39 can be used. The effect similar to the effect demonstrated in the said 3rd Embodiment can be acquired by replacing the cell in the some component carrier in 3rd Embodiment with the cell in the some transmission point of this embodiment. Further, since the parameter setting method for a plurality of component carriers can be applied to the parameter setting at a plurality of transmission points, the feedback mode can be easily extended to a system that supports a plurality of transmission points.

Thus, the base station apparatus sets a backward compatible feedback mode for feeding back a precoding matrix or an extended feedback mode for feeding back a plurality of partial precoder information to a terminal apparatus at a plurality of transmission points. At this time, an offset value in the backward compatible feedback mode is set as a parameter related to the period in the extended feedback mode in each downlink component carrier or an offset value in the partial precoder information. Thereby, the extended feedback mode and the backward compatible feedback mode can be easily switched at a plurality of transmission points. In addition, it is possible to reduce the collision of reports regarding different transmission points.
(Fifth embodiment)
In the fifth embodiment of the present invention, functional blocks of the base station apparatus and terminal apparatus according to the present invention will be described. The fifth embodiment of the present invention will be described below with reference to the drawings.

FIG. 41 is a schematic diagram illustrating an example of the configuration of the base station apparatus according to the present embodiment. The base station apparatus includes a coding unit 4101, a scramble unit 4102, a modulation unit 4103, a layer mapping unit 4104, a precoding unit 4105, a reference signal generation unit 4106, a resource element mapping unit 4107, an OFDM signal generation unit 4108, a transmission antenna (base station). Side transmission antenna) 4109, reception antenna (base station side reception antenna) 4110, reception signal processing unit 41
11, a feedback information processing unit 4112, and an upper layer 4113.

Each transmission data (bit sequence) for each codeword (transmission data sequence) sent from the upper layer 4113 is subjected to error correction coding and rate mapping processing by the encoding unit 4101, and multiplied by a scrambling code in the scrambling unit 4102. Modulation unit 410
3 is PSK (Phase Shift Keying) modulation or QAM (Quadratu).
Modulation processing such as re Amplitude Modulation) is performed. At this time, the transmission data sequence transmitted from the upper layer 4113 includes control data for RRC signaling. The layer mapping unit 4104 distributes the modulation symbol sequence output from the modulation unit 4103 for each layer. Precoding section 4105 performs precoding processing on the modulation symbol sequence for each layer. More specifically, the precoding matrix is multiplied.

The reference signal generation unit 4106 generates a downlink RS. Resource element mapping section 4107 maps the modulation symbol sequence precoded by precoding section 4105 and the RS generated by reference signal generating section 4106 to a predetermined resource element.

The resource block group output from the resource element mapping unit 4107 is OF
The DM signal generation unit 4108 converts the signal into an OFDM signal and transmits it as a downlink transmission signal from the transmission antenna 4109.

On the other hand, the uplink reception signal received by the reception antenna 4110 is subjected to predetermined signal processing in the reception signal processing unit 4111, and then feedback information is sent to the feedback information processing unit 4112. Feedback information processing section 4112 determines a precoding matrix to be used in precoding section 4105 using the partial precoder information reported from the terminal device. Here, as described in the above embodiments, the timing for reporting each content can be set differently for each terminal device. Therefore, upper layer 4
113 sets the RI / CQI / PI period and offset in the feedback information processing unit 4112, and the feedback information processing unit 4112 transmits the signal sent from the received signal processing unit 4111 at any timing to any terminal device. Whether the content is included can be identified, and a suitable precoder in each terminal device can be reproduced.

FIG. 42 is a schematic diagram illustrating an example of a configuration of a terminal device (receiving device) according to the present embodiment.
The terminal device includes a reception antenna (terminal-side reception antenna) 4201, an OFDM signal demodulation unit 420.
2, resource element demapping unit 4203, filter unit 4204, layer demapping unit 4205, demodulation unit 4206, descrambling unit 4207, decoding unit 4208, higher layer 4209, reference signal measurement unit 4210, feedback information generation unit 4211, transmission signal A generation unit 4212 and a transmission antenna (terminal-side transmission antenna) 4213 are included.

The downlink received signal received by the receiving antenna 4201 is sent from the OFDM signal demodulator 4.
In 202, OFDM demodulation processing is performed, and a resource block group is output. Resource element demapping section 4203 outputs RS to reference signal measuring section 4210 and outputs received signals in resource elements other than the resource element to which RS is mapped to filter section 4204. The filter unit 4204 performs a filtering process on the received signal output from the resource element demapping unit 4203.
The filtered signal is in a state where a decoding process corresponding to precoding in the precoding unit 4105 has already been performed, and a signal for each layer is output from the filter unit 4204. The layer demapping unit 4205 performs a combining process corresponding to the layer mapping unit 4104, and converts a signal for each layer into a signal for each codeword. The demodulated unit 4206 converts the converted signal for each codeword into a modulating unit 4103.
In the descrambling unit 4207, the conjugate code of the scrambling code used in the scrambling unit 4102 is multiplied (divided by the scrambling code), and then the rate demapping process is performed in the decoding unit 4208. Then, error correction decoding processing is performed, and received data for each codeword is acquired and sent to the upper layer 4209. Here, the reception data sent to the upper layer 4209 includes control data for RRC signaling, and the upper layer 4209 obtains a command from the base station apparatus by RRC signaling.

Here, in the filtering process performed by the filter unit 4204, ZF (Zero Forcing) or MMSE (Minimum) is applied to the reception signal for each reception antenna 4201.
Mean Square Error) and MLD (Maximum Likeliho)
The signal for each layer in FIG. 41 is detected using a method such as (d Detection).

On the other hand, in the reference signal measurement unit 4210, the RS acquired by the resource element demapping unit 4203 is measured, and the measurement result is output to the feedback information generation unit 4211. Based on the feedback mode, the feedback information generation unit 4211 uses the RS measurement result output from the reference signal measurement unit 4210 to perform partial precoder information, RI, C
Feedback information such as QI is generated.

The feedback information generated in the feedback information generation unit 4211 is converted into a transmission signal in the transmission signal generation unit 4212 and transmitted as an uplink transmission signal via the transmission antenna 4213.

Here, as described in the above embodiments, the timing for reporting each content can be set differently for each terminal device. Therefore, the upper layer 4209 sets the RI / CQI / PI period and offset in the feedback information generation unit 4211 and the transmission signal generation unit 4212, and the feedback information processing unit 4112 generates a signal including any content at any timing. Identify what to do. Further, the transmission signal generation unit 42
12 identifies at which timing a signal including which content is transmitted.

In each of the above embodiments, the case where a suitable precoder is reported to the base station has been described. However, even when an inappropriate precoder is reported, the precoding process at the base station is efficiently performed by using the same process. Can be done automatically. In this case, for example, it is possible to use a method of selecting a precoder from the code book that reduces the received signal power in consideration of the propagation path.

41. A program for realizing the functions of all or part of the base station apparatus in FIG. 41 or all or part of the terminal apparatus in FIG. 42 is recorded on a computer-readable recording medium, and the recording medium is recorded on this recording medium. Processing of each unit may be performed by reading a recorded program into a computer system and executing the program. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.

The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. “Computer-readable recording medium”
Is a program that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. Such a volatile memory inside a computer system as described above includes a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

Further, the functions of all or part of the base station apparatus in FIG. 41 and all or part of the terminal apparatus in FIG. 42 may be integrated and realized in an integrated circuit. Each functional block of the base station apparatus and the terminal apparatus may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention.

The present invention is suitable for use in a radio base station apparatus, a radio terminal apparatus, a radio communication system, and a radio communication method.

DESCRIPTION OF SYMBOLS 101 ... Base station apparatus 102 ... Terminal apparatus 103 ... Downlink transmission signal 104 ... Feedback information 4101 ... Encoding part 4102 ... Scrambler 4103 ... Modulation part 4104 ... Layer mapping part 4105 ... Precoding part 4106 ... Reference signal generation part 4107 ... Resource Element mapping section 4108 ... OFDM signal generation section 4109 ... transmission antenna 4110 ... reception antenna 4111 ... reception signal processing section 4112 ... feedback information processing section 4113 ... upper layer 4201 ... reception antenna 4202 ... OFDM signal demodulation section 4203 ... resource element demapping section 4204: Filter unit 4205 ... Layer demapping unit 4206 ... Demodulation unit 4207 ... Descramble unit 4208 ... Decoding unit 4209 ... Upper layer 4210 ... Reference signal measurement unit 4211 ... Dobakku information generation unit 4212 ... transmission signal generator 4213 ... transmitting antennas 4301 ... base station apparatus 4302 ... terminal device 4303 ... downlink transmission signal 4304 ... feedback information

Claims (6)

A terminal apparatus that communicates with the group Chikyoku device,
An upper layer processing unit that sets a periodic resource based on the period notified from the base station device ;
In the first feedback mode, one precoder information and a channel quality indicator are reported using the periodic resource ,
In the second feedback mode, a first partial precoder information, and a second partial precoder information and channel quality indicators by using the periodic resources comprises a Ruho tell means to report alternately a,
And combination of the previous SL first partial precoder information before Symbol second partial precoder information, each of said precoder information corresponds to one of precoding matrix, the terminal device. In the second feedback mode , the reporting means uses each of the first partial precoder information, the second partial precoder information, and the channel quality indicator as a period twice the period using the periodic resource. The terminal device according to claim 1, which reports alternately . A base station apparatus that communicates with the end terminal apparatus,
And the upper layer processing means for notifying the period of periodic reports to be made from the terminal device,
In the first feedback mode, from the terminal device to receive one of the precoder information and channel quality indicator by the cycle,
Receiving means for alternately receiving the first partial precoder information , the second partial precoder information and the channel quality indicator in the period in the second feedback mode ;
Before SL and the combination of the first partial precoder information before Symbol second partial precoder information, each of said precoder information corresponds to one of precoding matrix, the base station apparatus. The reception unit receives each of the first partial precoder information, the second partial precoder information, and the channel quality indicator in a period twice as long as the period in the second feedback mode. The base station apparatus as described. A communication method used in a terminal apparatus that communicates with the group Chikyoku device,
Setting a periodic resource based on a period notified from the base station device via an upper layer ;
In the first feedback mode, one precoder information and a channel quality indicator are reported using the periodic resource ,
In the second feedback mode, a first partial precoder information, each of the second partial precoder information and channel quality indicators by using the periodic resource, said comprising a Luz step reportable alternately, the a combination of the first partial precoder information before Symbol second partial precoder information, each of said precoder information, characterized in that it corresponds to one of precoding matrix, a communication method. A communication method used in a base station apparatus that communicates with the end terminal apparatus,
And notifying the period of periodic reports to be made from the terminal device via the higher layer,
In the first feedback mode, from the terminal device to receive one of the precoder information and channel quality indicators in the previous SL period,
In the second feedback mode, a first partial precoder information, and a second partial precoder information and channel quality indicator, and a receiving alternately the period,
Wherein the combination of the first partial precoder information before Symbol second partial precoder information, each of said precoder information, characterized in that it corresponds to one of precoding matrix, a communication method.