Technical field
[0001]
　The present disclosure relates to an apparatus.
Background technique
[0002]
　Currently, 3GPP (Third Generation Partnership Project), to accommodate the traffic increases explosively, various techniques for improving the capacity of cellular systems has been studied. In the future, the current amount of 1000 times is said to be necessary. The MU-MIMO (Multi-User Multiple-Input Multiple-Output) and CoMP (Coordinated Multipoint) such technology, the capacity of the cellular system is considered only a few times does not increase. Therefore, innovative methods have been sought.
[0003]
　For example, as a method for significantly increasing the capacity of a cellular system, a large number of antenna elements (e.g., antenna elements of approximately 100) the base station using a directional antenna comprising it is conceivable to perform beamforming . Such techniques, large scale (Large-Scale) MIMO, is a form of technology called massive (Massive) MIMO, or FD (Free Dimension) -MIMO. According to such a beam forming a half-value width of the beam is narrowed. That is, a sharp beam is formed. Further, by arranging the plurality of antenna elements on a plane, it is possible to form a beam in a desired three-dimensional directions.
[0004]
　For example, Patent Documents 1 to 3, applied techniques are disclosed when the directional beam of the three-dimensional direction is used.
CITATION
Patent Literature
[0005]
Patent Document 1: JP 2014-204305 Patent Publication
Patent Document 2: JP 2014-53811 JP
Patent Document 3: JP 2014-64294 JP
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　In 3GPP standards, the sub-array for multi-layer MIMO (i.e., transmission to the terminal device in two or more layers) are uniquely determined. On the other hand, as large scale MIMO case, the antenna port with the increase of the antenna elements increases, increases flexibility, various sub-array can be configured. Furthermore, various combinations of the subarrays can be used as an array antenna system. Also, the combination of sub-arrays it is desirable to be used (i.e., an array antenna system it is desirable to be used) can vary by the terminal device. Nevertheless, when the sub-array as in the prior art are uniquely determined, in a multi-layer MIMO undesirable subarray for the terminal device may be used. As a result, a communication speed or communication quality of the terminal device may be reduced.
[0007]
　Therefore, it is desirable that a mechanism that allows to use a combination of desired sub-array for multi-layer MIMO is provided.
Means for Solving the Problems
[0008]
　According to the present disclosure, an acquisition unit that acquires subarray information indicating a plurality of sub-arrays that can be used for multi-layer MIMO (Multi-Input Multi-Output), a control unit for notifying the subarray information to the terminal device, device comprising a are provided.
[0009]
　Further, according to the present disclosure, the control carried out an acquisition unit that acquires a subarray information indicating a plurality of sub-arrays that can be used for multi-layer MIMO, a report on a combination of two or more sub-arrays included in the plurality of sub-arrays apparatus is provided comprising a section, a.
Effect of the invention
[0010]
　According to the present disclosure described above, it is possible to use a combination of desired sub-array for multi-layer MIMO. Incidentally, the above effect is not necessarily limiting, together with the effect, or in place of the effect, any of effect shown herein, or other effects that may be grasped from the description Kanade it may be.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011]
FIG. 1 is an explanatory diagram for explaining a set of weights for beamforming large scale MIMO.
It is an explanatory view for explaining the relationship between the insertion of the multiplier and the reference signal of FIG. 2 weighting factor.
3 is an explanatory diagram showing an example of a schematic configuration of a system according to an embodiment of the present disclosure.
4 is a block diagram showing an example of a configuration of a base station according to the embodiment.
5 is a block diagram showing an example of a configuration of a terminal device according to the embodiment.
6 is an explanatory diagram for explaining an example of the antenna port.
7 is an explanatory diagram for explaining a first example of a sub-array.
8 is an explanatory diagram for explaining a second example of sub-array.
9 is an explanatory diagram for explaining a third example of the sub-array.
FIG. 10 is an explanatory diagram for explaining a fourth example of the sub-array.
11 is an explanatory diagram for the base station to explain an example of information to be notified to the terminal device in the same embodiment.
[12] the terminal device in the same embodiment is an explanatory diagram for explaining an example of report information to report to the base station.
13 is a sequence diagram showing an example of a schematic flow of processing according to the embodiment.
[14] The base station in the first modification of the embodiment is an explanatory view for explaining an example of information to be notified to the terminal device.
It is an explanatory diagram for the terminal apparatus in the first modification of FIG. 15 the embodiment will be described an example of report information to report to the base station.
[16] The base station in the first modification of the embodiment is an explanatory diagram for explaining another example of information to be notified to the terminal device.
17 is a first explanatory diagram for explaining a first example of a group of sub-arrays.
18 is a second explanatory diagram for explaining a first example of a group of sub-arrays.
19 is a first explanatory diagram for explaining a second example of a group of sub-arrays.
FIG. 20 is a second explanatory diagram for explaining a second example of a group of sub-arrays.
21 is a first explanatory diagram for explaining a third example of a group of sub-arrays.
22 is a second explanatory diagram for explaining a third example of a group of sub-arrays.
[23] The base station in the second variation of the embodiment is an explanatory view for explaining an example of information to be notified to the terminal device.
It is an explanatory view for explaining an example of a set of sub-arrays including fewer antenna port [24].
It is an explanatory view for explaining an example of a set of sub-arrays containing more antenna ports [25].
It is a block diagram showing a first exemplary configuration of FIG. 26] eNB.
It is a block diagram showing a second exemplary configuration of FIG. 27] eNB.
[FIG. 28] is a block diagram showing an example of a schematic configuration of a smart phone.
Is a block diagram showing an example of a schematic configuration of a [29] a car navigation system.
DESCRIPTION OF THE INVENTION
[0012]
　With reference to the accompanying drawings, it will be described in detail preferred embodiments of the present disclosure. In the specification and the drawings, components having substantially the same function and structure are a repeated explanation thereof by referring to the figures.
[0013]
　The description will be made in the following order.
　1. Introduction
　　1.1. Related technologies
　　1.2. Technical challenges
　2. Schematic configuration of the system
　3. Configuration of each device
　　3.1. The configuration of the base station
　　3.2. Configuration of the terminal apparatus
　4. Technical features
　5. Processing of flow
　6. Modification
　　6.1. First modification
　　6.2. Second variation
　　6.3. Third modification
　7. Applications
　　7.1. Application example of a base station
　　7.2. Application example of the terminal device
　8. Summary
[0014]
　<< 1. First >>
　First, with reference to FIGS. 1 and 2, illustrating a related technology and technical characteristics according to the embodiment of the present disclosure.
[0015]
　<1.1. Related Art>
　with reference to FIGS. 1 and 2, as a related technology according to an embodiment of the present disclosure, illustrating a beamforming and antenna port.
[0016]
　(1) beam forming
　(a) Large-scale MIMO needs
　now, In 3GPP, in order to accommodate the traffic increases explosively, various techniques for improving the capacity of cellular systems has been studied. In the future, the current amount of 1000 times is said to be necessary. In technologies such as MU-MIMO and CoMP, the capacity of the cellular system is considered only a few times does not increase. Therefore, innovative methods have been sought.
[0017]
　In 3GPP Release 10, it has been standardized that the eNodeB equipped with eight antennas. Therefore, according to the antenna, it is possible to realize an 8-layer MIMO in the case of SU-MIMO (Single-User Multi-Input Multiple-Input Multiple-Output). The eight-layer MIMO, a spatially multiplexed technology eight streams independent. It is also possible to realize the MU-MIMO of the second layer to 4 users.
[0018]
　UE (User Equipment) in that space for the placement of the antenna is small, and the UE processing capacity due to that there is a limit, it is difficult to increase the antenna elements of the UE antenna. However, recent advances in the antenna mounting technique, placing a directional antenna comprising a 100 degree antenna element to the eNodeB has become not impossible.
[0019]
　For example, as a method for significantly increasing the capacity of a cellular system, a large number of antenna elements (e.g., antenna elements of approximately 100) the base station using a directional antenna comprising it is conceivable to perform beamforming . Such techniques, is a form of technology called large scale (Large-Scale) MIMO or massive (Massive) MIMO. According to such a beam forming a half-value width of the beam is narrowed. That is, a sharp beam is formed. Further, by arranging the plurality of antenna elements on a plane, it is possible to form a beam in a desired three-dimensional directions. For example, a position higher than the base station (e.g., the upper floors of a tall building) by forming a beam towards, sending a signal to the terminal device present in the position have been proposed.
[0020]
　In a typical beam forming, it is possible to control the direction of the beam in the horizontal direction. Therefore, the typical beamforming, it can be said that the two-dimensional beamforming. On the other hand, in the beam forming large scale MIMO (or Massive MIMO), it is possible to control the direction of the beam in the vertical direction in addition to the horizontal direction. That is, it is possible to form a three-dimensional beams having the desired directivity of the horizontal and vertical directions. Therefore, beamforming large scale MIMO is also true 3-dimensional beamforming. For example, by using antenna elements arranged in two dimensions, it is possible to form a three-dimensional beam.
[0021]
　Since the number of antennas increases, it is possible to increase the number of users in MU-MIMO. Such technology is another form of technology called large scale MIMO or Massive MIMO. Note that when the number of antennas of the UE is 2, since the number of spatially independent streams for one UE is two, than increasing the number of streams for one UE, MU-MIMO If you increase the number of users is reasonable.
[0022]
　(B) weight set
　beam weight set for forming (i.e., a set of weighting factors for the plurality of antenna elements) is expressed as a complex number. Referring to FIG. 1, especially illustrating an example of a weight set for beamforming large scale MIMO.
[0023]
　Figure 1 is an explanatory diagram for explaining a set of weights for beamforming large scale MIMO. Referring to FIG. 1, the antenna elements arranged in a grid pattern is shown. Also, the two axes x orthogonal on a plane antenna elements are arranged, y, and also shows a single axis z orthogonal to the plane. Here, the direction to be formed beam is represented by, for example, an angle phi (Greek) and angle theta (Greek). Angle phi (Greek) is the angle between the component and the x-axis of the xy plane of the beam direction. The angle theta (Greek) is the angle between the beam direction and the z-axis. In this case, for example, are arranged in m-th in the x-axis direction, the weighting factor V of the antenna elements arranged in n-th in the y-axis direction m, n can be expressed as follows.
[0024]
[Number 1]

[0025]
　f is the frequency, c is the speed of light. Further, j is an imaginary unit in the complex. Further, d x is the spacing of the antenna elements in the x-axis direction, d y is the spacing between the antenna elements in the y-axis direction. The coordinate of the antenna element is represented as follows.
[0026]
[Number 2]

[0027]
　Typical beam weight set for forming (two-dimensional beam forming), the weight set for obtaining the directivity in the horizontal direction, the multi-layer MIMO (e.g., dual layer MIMO) weight set for phase adjustment (e.g., weight set for phase adjustment between two antenna sub-arrays corresponding to different polarization) and can be broken down into. On the other hand, the weight set for large scale MIMO beamforming (3D beamforming), the second weight set for obtaining a first weight set for obtaining the directivity in the horizontal direction, the directivity in the vertical direction When a multi-layer MIMO (e.g., dual layer MIMO) may be decomposed into a third weight set for phase adjustment. For example, the third weight set is a set of weights for phase adjustment between subarrays. Incidentally, if sent in a single layer, multi-layer MIMO (e.g., dual layer MIMO) may not be included in the weight set for the phase adjustment of the.
[0028]
　(C) receiving a signal
　by a directional beam for demodulation (stands for demodulation) of (over a directional beam) signals transmitted, eNB (evolved Node B), in the downlink, along with the data signal DMRS (Demodulation Reference Signal) to send. DMRS is a known sequence for UE, (the same as the set of weighting factors to be multiplied to the data signal) sets weighting coefficients for beamforming is multiplied. UE, based on the reception result of the DMRS, by restoring the phase and amplitude of the data signal, and demodulates the data signal, decodes.
[0029]
　The difference between (d) CRS and CSI-RS and DMRS
　In LTE, in addition to the DMRS, this is a reference signal that CRS (Cell-specific Reference Signal) and CSI-RS (Channel State Information Reference Signal). CRS and CSI-RS is not intended to be used for demodulation of the data signal, which is used to mainly measure the channel quality. Specifically, CRS is used for cell selection, CSI-RS is used for the determination of the modulation scheme. Thus, according to current standards, CRS and CSI-RS is not transmitted by directional beam, it is transmitted by nondirectional radio.
[0030]
　Incidentally, it is conceivable to transmit the CRS and / or CSI-RS by directional beam. Omnidirectional Radio waves to send the CRS and / or CSI-RS, or, is to send the CRS and / or CSI-RS by directional beam, by design concept of the occasional system.
[0031]
　Meanwhile, DMRS Since sent for demodulation of the data signal transmitted by the directional beam is transmitted similarly by the directional beam.
[0032]
　Referring to FIG. 2, an example of the multiplication of the reference signal and the weight coefficient. Figure 2 is an explanatory view for explaining the relationship between the insertion of the multiplier and the reference signal of the weighting factor. Referring to FIG. 2, the transmission signal 82 corresponding to the respective antenna elements 81, a weighting factor 83 is complex multiplied in multiplier 84. The transmission signal 82 the weighting coefficients 83 is complex multiplication is transmitted from the antenna element 81. Also, DR-MS85 is inserted before the multiplier 84, the weight coefficient 83 is complex multiplied in multiplier 84. Then, DR-MS85 weighting coefficient 83 is complex multiplication is transmitted from the antenna element 81. On the other hand, CRS86 (and CSI-RS) is inserted after the multiplier 84. Then, CRS86 (and CSI-RS), without being multiplied by a weighting factor 83, is transmitted from the antenna element 81.
[0033]
　(2) antenna ports
　(a) virtual antennas
　In LTE, instead of physical antennas / antenna elements, virtual antennas are provided as antenna port. Antenna ports corresponding to one or more physical antennas or antenna elements, but either antenna port corresponds to which antenna / antenna element specifically implementation dependent, there is a degree of freedom. For example, one antenna port may correspond to one antenna (e.g., one conventional antennas or one antenna array). Further, for example, one antenna port may correspond to one of the antenna elements in the array antenna (or a plurality of antenna elements).
[0034]
　(B) resources associated with the antenna port
　as described above, for example, for multiple antenna ports, a plurality of resources that is orthogonal (an orthogonal) is prepared together, are used to send the DMRS. For example, eNB may first antenna port (e.g., antenna port 10) is used to transmit the DMRS in the first resource, using a second antenna port (e.g., antenna port 11), the transmitting the DMRS in a second resource that is orthogonal to the first resource.
[0035]
　The "resources" here, for example, a combination of a time-frequency resources and code sequence, and resources that are associated with any one of the antenna ports, the resources associated with another antenna port, They are orthogonal to each other. That is, the resources associated with any one of the antenna ports, the resources associated with other antenna ports, at least one of the time-frequency resources and code sequences are different.
[0036]
　Why prepare resources (c) orthogonal
　to each antenna port, it corresponds to the antenna / antenna element in spatially different positions, thereby spatially independent channels obtained between the eNB and the UE It is. In the previous step to obtain the orthogonal channel, the reference signal (e.g., CSI-RS) is necessary to estimate the channel characteristics based on. Since the interference to the reference signal is generated to estimate the channel characteristics becomes difficult, so that interference does not occur between the reference signal transmitted using a different antenna ports for each antenna port, perpendicular resources (i.e., different resources) are prepared.
[0037]
　For example, eNB has 64 antenna (e.g., 64 antenna ports to the virtual), UE also has eight antennas. In this case, the channel matrix H of 64 × 8 is calculated. Then, the calculated generalized inverse matrix of the channel matrix H is multiplied by the left side of the generalized inverse matrix to the received data, spatially independent eight channels are obtained. Especially, in order to properly calculate the channel matrix H, so that the interference does not occur between the reference signal transmitted using the 64 antenna ports, to each of the 64 one antenna port, orthogonal resources (i.e., different resources) are prepared.
[0038]
　(D) determining channel state information
　UE based on the channel matrix, PMI (Precoding Matrix Indicator), to determine a RI (Rank Indicator) and / or CQI (Channel Quality Indicator). These pieces of information are referred to as channel state information (Channel State Information). UE feeds back the information to the eNB.
[0039]
　<1.2. Technical problem>
　In the 3GPP standard, sub-arrays for multi-layer MIMO (i.e., transmission to the terminal device in two or more layers) are uniquely determined. More specifically, for example, eNB sends the CSI-RS using eight antenna ports (antenna port 15-22), the UE with two antennas, 2 × based on CSI-RS 8 to get the channel matrix. Then, the UE, based on the channel matrix, determines the PMI indicating the pre-coding matrix. In this case, UE can the eight antenna ports, is regarded as two sub-arrays comprising four antenna ports, respectively, to determine the PMI. In this way, the sub-arrays are uniquely determined.
[0040]
　On the other hand, as large scale MIMO case, the antenna port with the increase of the antenna elements is increased (e.g., antenna ports of the antenna elements and 64 64), increases the flexibility, various sub-array can be configured. Furthermore, various combinations of the subarrays can be used as an array antenna system. Also, the combination of sub-arrays it is desirable to be used (i.e., an array antenna system it is desirable to be used) can vary by the terminal device. Nevertheless, when the sub-array as in the prior art are uniquely determined, in a multi-layer MIMO undesirable subarray for the terminal device may be used. As a result, a communication speed or communication quality of the terminal device may be reduced.
[0041]
　Therefore, it is desirable that a mechanism that allows to use a combination of desired sub-array for multi-layer MIMO is provided.
[0042]
　<< 2. Schematic configuration of a system >>
　Subsequently, with reference to FIG. 3, illustrating a schematic configuration of a system 1 according to an embodiment of the present disclosure. Figure 3 is an explanatory diagram showing an example of a schematic configuration of a system 1 according to an embodiment of the present disclosure. 3, the system 1 includes a base station 100 and the terminal device 200. System 1 may, for example, LTE, an LTE-Advanced or system that conforms to communication standard equivalent thereto.
[0043]
　(1) the base station 100
　the base station 100 performs wireless communication with the terminal apparatus 200. For example, the base station 100 performs wireless communication with the terminal device 200 located in the cell 101 of the base station 100.
[0044]
　Especially in embodiments of the present disclosure, the base station 100 supports multi-layer MIMO. That is, the base station 100 transmits a signal to the terminal device 200 in two or more layers. Base station 100, for transmission in the two or more layers, using an array antenna system is a combination of the two or more layer number of the layer as many (or more than the number of layers) subarrays to.
[0045]
　For example, the base station 100 has a directional antenna, as a multi-layer MIMO, a multi-layer beamforming. That is, the base station 100, two or more layers, and transmits the signal to the terminal device 200 by a directional beam.
[0046]
　Further, for example, base station 100 includes a directional antenna having a plurality of antenna elements, (in other words, such massive MIMO or FD-MIMO) Large-scale MIMO supports. For example, the base station 100 (in other words, massive MIMO or FD-MIMO beamforming, or 3-dimensional beamforming) Large-scale MIMO beamforming as, directional beams having both-directional in the horizontal and vertical directions (i.e., three-dimensional beam) by sending a signal to the terminal apparatus 200.
[0047]
　(2) the terminal device 200
　the terminal apparatus 200 performs wireless communication with the base station 100. For example, the terminal device 200, when located in the cell 101 of the base station 100 performs wireless communication with the base station 100.
[0048]
　Especially in embodiments of the present disclosure, the terminal device 200 supports the multi-layer MIMO. That is, the terminal device 200 transmits a signal from the base station 100 in two or more layers.
[0049]
　<< 3. Configuration >> of each device
　followed, with reference to FIGS. 4 and 5, an example of a configuration of base station 100 and the terminal device 200.
[0050]
　<3.1. Configuration of Base Station>
　First, with reference to FIG. 4, an example of a configuration of base station 100 according to an embodiment of the present disclosure. Figure 4 is a block diagram showing an example of a configuration of a base station 100 according to the embodiment of the present disclosure. Referring to FIG. 4, the base station 100 includes an antenna unit 110, the wireless communication unit 120, a network communication unit 130, storage unit 140 and the processing unit 150.
[0051]
　(1) Antenna unit 110
　antenna unit 110 radiates into the space the signal output by the radio communication unit 120 as a radio wave. The antenna unit 110 converts the radio waves of space signal, and outputs the signal to the radio communication unit 120.
[0052]
　For example, antenna unit 110 includes a directional antenna. For example, the directional antenna is a large scale MIMO available directional antennas (e.g., directional antenna comprising a plurality of antenna elements).
[0053]
　(2) wireless communication unit 120
　radio communication unit 120 transmits and receives signals. For example, wireless communication unit 120 transmits a downlink signal to the terminal device 200 receives uplink signals from terminal 200.
[0054]
　(3) Network communication unit 130
　network communication unit 130 sends and receives information. For example, the network communication unit 130 transmits the information to other nodes, to receive information from other nodes. For example, the other nodes, including other base stations and a core network node.
[0055]
　(4) storage unit 140
　storage unit 140 stores programs and data for the operation of the base station 100.
[0056]
　(5) processing unit 150
　processing unit 150 provides various functions of the base station 100. Processing unit 150 includes an information acquisition unit 151 and the control unit 153. The processing unit 150 may further include other components other than these components. That is, processor 150 may perform also the operation other than the operation of these components.
[0057]
　Specific operation of the information acquisition unit 151 and the control unit 153 will be described in detail later.
[0058]
　<3.2. Configuration of Terminal Device>
　Next, with reference to FIG. 5, an example of a configuration of a terminal apparatus 200 according to an embodiment of the present disclosure. Figure 5 is a block diagram showing an example of a configuration of a terminal apparatus 200 according to an embodiment of the present disclosure. Referring to FIG. 5, the terminal device 200 includes an antenna unit 210, radio communication unit 220, storage unit 230 and the processing unit 240.
[0059]
　(1) Antenna unit 210
　antenna unit 210 radiates into the space the signal output by the radio communication unit 220 as a radio wave. The antenna unit 210 converts the radio waves of space signal, and outputs the signal to the wireless communication unit 220.
[0060]
　(2) wireless communication unit 220
　radio communication unit 220 transmits and receives signals. For example, wireless communication unit 220 receives the downlink signal from the base station 100 transmits an uplink signal to the base station 100.
[0061]
　(3) storage unit 230
　storage unit 230 stores programs and data for the operation of the terminal apparatus 200.
[0062]
　(4) processing unit 240
　processing unit 240 provides various functions of the terminal apparatus 200. Processing unit 240 includes an information obtaining unit 241 and control unit 243. The processing unit 240 may further include other components other than these components. That is, the processing unit 240 may perform also the operation other than the operation of these components.
[0063]
　Specific operation of the information acquisition unit 241 and the control unit 243 will be described in detail later.
[0064]
　<< 4. Technical features >>
　Subsequently, with reference to FIGS. 6-12, illustrating the technical features according to embodiments of the present disclosure.
[0065]
　(1) Notification of subarrays information
　base station 100 (information acquiring unit 151) obtains the subarray information indicating a plurality of sub-arrays that can be used for multi-layer MIMO. Then, the base station 100 (control section 153) notifies the sub-array information to the terminal device.
[0066]
　(A) sub-array
　for example, each of the plurality of sub-arrays may include one or more antenna ports. Further, for example, each antenna port is a virtual antennas corresponding to one or more physical antenna elements. Referring to FIGS, illustrating an example of antenna ports and the sub-array.
[0067]
　Figure 6 is an explanatory diagram for explaining an example of an antenna port. Referring to FIG. 6, the directional antenna in the horizontal and vertical directions of each eight in the antenna elements are arranged 8 × 8 is shown. That is, shown directional antenna having an antenna element 64. For example, the base station 100 has the directional antenna. Especially in this example, an antenna port may correspond to one antenna element. Therefore, the base station 100 includes a 64 antenna ports.
[0068]
　Figure 7 is an explanatory diagram for explaining a first example of a sub-array. Referring to FIG. 7, similarly to FIG. 6, there is shown a directional antenna 8 × 8. For example, the sub-arrays, sub-arrays 301 and 303 comprise the eight vertically adjacent antenna ports (eight antenna elements) respectively are prepared. The plurality of sub-arrays may include such sub-arrays 301 and 303.
[0069]
　Figure 8 is an explanatory diagram for explaining a second example of sub-array. Referring to FIG. 8, similarly to FIG. 6, there is shown a directional antenna 8 × 8. For example, the sub-arrays, sub-arrays 311, 313 comprising eight antenna ports arranged in the horizontal direction (eight antenna elements) respectively are prepared. The plurality of sub-arrays may include such sub-arrays 311, 313.
[0070]
　Incidentally, the plurality of sub-arrays may include two or more sub-arrays that include one or more antenna ports in common. Thus, for example, it may increase the flexibility of the sub-array. Hereinafter, with reference to FIGS. 9 and 10, an example of such a subarray.
[0071]
　Figure 9 is an explanatory diagram for explaining a third example of the sub-array. Referring to FIG. 9, there is shown a directional antenna 8 × 8. For example, the sub-arrays, the sub-array 321 includes eight antenna ports arranged in the horizontal direction (eight antenna elements), and sub-array 323 includes eight antenna ports arranged in the vertical direction (eight antenna elements) is prepared. Subarrays 321 and subarray 323 includes one antenna port (one antenna element) in common. The plurality of sub-arrays may include such sub-arrays 321 and 323.
[0072]
　Figure 10 is an explanatory diagram for explaining a fourth example of the sub-array. Referring to FIG. 10, there is shown a directional antenna 8 × 8. For example, the sub-arrays, sub-arrays 331 and 333 in the horizontal direction and each 7 to the vertical antenna ports (antenna elements) are arranged 7 × 7 are prepared. Subarrays 331 and subarray 333 includes a common antenna port (36 antenna elements) of 36. The plurality of sub-arrays may include such sub-arrays 331 and 333.
[0073]
　(B) the content of the sub-array information
　for example, the sub-array information includes information indicating an antenna port included in each of said plurality of subarrays. More specifically, for example, the sub-array information includes the port number of antenna ports included in each of the plurality of sub-arrays.
[0074]
　The above subarray information may include identification information for identifying each of said plurality of subarrays. More specifically, the sub-array information may include sub-array number of each of the plurality of sub-arrays.
[0075]
　(C) notifying method
　(c-1) signaling
　e.g., base station 100 (control section 153), the signaling to the terminal device 200 (e.g., RRC (Radio Resource Control) signaling), the said sub-array information to the terminal device 200 Notice. More specifically, for example, base station 100 (control unit 153) a signaling message (e.g., RRC (Radio Resource Control) message) in, and notifies the sub-array information to the terminal apparatus 200.
[0076]
　As specific processing, for example, the control unit 153 generates a signaling message including the sub-array information. Then, the processing unit 150 (e.g., controller 153) performs transmission processing of the signaling message.
[0077]
　(C-2) system information
　or the base station 100 (control section 153), the system information (e.g., SIB (System Information Block)) in, and notifies the sub-array information to the terminal apparatus 200.
[0078]
　As specific processing, for example, the control unit 153 generates system information including the sub-array information. Then, the processing unit 150 (e.g., controller 153) performs transmission processing of the system information.
[0079]
　(2) Notification of the other information
　(a) a first number information
　for example, the base station 100 (information acquiring unit 151) acquires the first information on the number of indicating the number of sub-arrays to be combined for multi-layer MIMO . Then, the base station 100 (control section 153) notifies the first information on the number of the terminal device 200.
[0080]
　For example, the base station 100, using an array antenna system for multi-layer MIMO, the antenna array system is a combination of two or more sub-arrays. Therefore, the number of sub-arrays to be combined for multi-layer MIMO (e.g., M) is the number of sub-arrays in the array antenna system used for multi-layer MIMO. Further, the first information on the number of is information indicating the number of sub-arrays included in the array antenna system (e.g., M).
[0081]
　Thus, for example, the terminal device 200, it is possible to select the combination of sub-arrays that can be used for multi-layer MIMO.
[0082]
　(B) a second number information
　as described later, the terminal device 200 performs a report on a combination of two or more sub-arrays included in the plurality of sub-arrays. For example, the base station 100 (information acquiring unit 151) obtains the second information on the number of indicating the number of combinations of sub-arrays of interest reported. Then, the base station 100 (control section 153) notifies the second information on the number of the terminal device 200. For example, the number of the combination is less than the number of all combinations of sub-arrays.
[0083]
　Thus, for example, the radio resource is suppressed required for reporting by the terminal apparatus 200.
[0084]
　(C) third number information of
　example, the base station 100 (information acquiring unit 151) obtains the third number information indicating the number of sub-arrays included in the plurality of sub-arrays. Then, the base station 100 (control section 153) notifies the third number information to the terminal device 200.
[0085]
　(D) notification scheme
　for example, the base station 100 (control section 153), similar to the sub-array information, the first information on the number, the second number information and / or the third number information of the terminal device 200 to notify. More specifically, for example, base station 100 (control section 153) is through signaling to the terminal device 200, or, in the system information, the first information on the number, the second number information and / or notifying the third number information to the terminal device 200.
[0086]
　(3) Specific examples of the information that the base station notifies the terminal apparatus
　11 includes a base station 100 in the embodiment of the present disclosure is an explanatory view for explaining an example of information to be notified to the terminal apparatus 200. Referring to FIG. 11, the sub-array configuration 30 is shown, which is information the base station 100 notifies the terminal apparatus 200. In this example, sub-array configuration 30 includes subarrays information 31, the first number information 33, second information on the number 34, and the third number of information 35. Subarrays information 31 indicates the antenna port included in each of the available N subarrays for multi-layer MIMO (subarrays 1 ~ N). For example, sub-array 1 includes antenna ports 1-8, the subarray 2 includes an antenna ports 9-16. First number information 33 indicates the number of sub-arrays to be combined for multi-layer MIMO M (i.e., the number M of sub-arrays in the array antenna system) a. Second number information 34 indicates the number L of the combination of sub-arrays of interest reported. The third number information 35 indicates the total number of sub-arrays N.
[0087]
　(4) report on the combination of sub-arrays candidate
　terminal apparatus 200 (information acquiring unit 241) obtains the subarray information. Then, the terminal apparatus 200 (control unit 243) performs a report on a combination of two or more sub-arrays included in the plurality of sub-arrays.
[0088]
　(A) Examples of reports
　(a-1) combination of subarrays reporting
　example, the terminal apparatus 200 (control unit 243) from among the plurality of sub-arrays, select a combination of two or more sub-arrays desirable Multilayer MIMO and, said report includes a report of the combination of desired the two or more sub-arrays in a multi-layer MIMO. The above combinations, in other words, an array antenna system desirable multi-layer MIMO.
[0089]
　　- Selection of the combination of the sub-array
　for example, the terminal apparatus 200 (control unit 243) performs channel estimation based on a reference signal transmitted by the base station 100 (e.g., CSI-RS). Specifically, for example, base station 100 has a 64 antenna ports, the terminal device 200 has eight antennas. In this case, the base station 100 transmits a reference signal for each antenna port, the terminal apparatus 200 calculates the channel matrix of 64 × 8.
[0090]
　Furthermore, for example, the terminal apparatus 200 (control unit 243) as a result of the channel estimation (i.e., the channel matrix) based on, PMI for each combination of sub-arrays to determine the like RI and / or CQI. Then, for example, the terminal apparatus 200 (control unit 243) is, PMI for each combination of sub-arrays, based on the RI and / or CQI, selects a combination of desired sub-array of multilayer MIMO. As an example, the terminal apparatus 200 (control unit 243) is a combination of sub-arrays with a larger RI, is selected as a combination of desired sub-array of multilayer MIMO.
[0091]
　　- Report of the combination of the sub-array
　for example, the terminal apparatus 200 (control unit 243), said two or more sub-arrays of the combination (i.e., the array antenna system) reports to the base station 100 the combination information indicating a.
[0092]
　Thus, for example, base station 100, it is possible to know the combination of desired sub-array for the terminal device 200.
[0093]
　(A-2) of the weight sets reporting
　example, the report includes a report of the weight set for the combination of the two or more sub-arrays. For example, the weight set includes a set of weights for adjusting the phase between the two or more sub-arrays.
[0094]
　　- weight set decision
　example, base station 100, the result of the channel estimation (i.e., the channel matrix) based on, determines the PMI for each combination of sub-arrays (i.e., indicator of pre-coding matrix is a weight set) to. More specifically, for example, base station 100, for each combination of sub-arrays, to determine a PMI weight set for obtaining the directivity, and / or, a PMI of the weight set for adjusting the phase between the sub-arrays .
[0095]
　Base station 100, as PMI of weight sets for obtaining the directivity, of the weight set for obtaining a horizontal directivity PMI, and the weight set for obtaining the vertical directionality of the PMI, whereas or to determine both. Alternatively, the base station 100, as PMI of weight sets to obtain directivity may be determined PMI of weight sets to obtain both directivity of the horizontal and vertical directions.
[0096]
　　- Report of the weight set
　for example, the terminal apparatus 200 (control unit 243) reports the weight information indicating the weight set for the combination of the two or more sub-arrays to the base station 100. For example, the weight information is PMI. More specifically, for example, the weight information is, PMI of weight sets to obtain directional, and / or a PMI of weight set for adjusting the phase between the sub-arrays.
[0097]
　Thus, for example, base station 100, it is possible to know the set of weights to be applied to the combination of sub-arrays.
[0098]
　(A-3) the number of layers of reporting
　example, the report includes a number of layers of the report on the combination of the two or more sub-arrays.
[0099]
　　- determination of the number of layers
　for example, base station 100, the channel estimation results (i.e., the channel matrix) based on, determining for each combination of sub-arrays RI (i.e., indicator of number of layers).
[0100]
　　- the number of layers of reporting
　example, the terminal apparatus 200 (control unit 243) reports the number of layers information indicating the number of layers of the two or more sub-arrays to the base station 100. For example, the number of the layer information is RI.
[0101]
　Thus, for example, base station 100, it is possible to know the number of applicable layers to a combination of sub-arrays.
[0102]
　(A-4) channel conditions reported
　for example, the report includes a report of channel quality for the combination of the two or more sub-arrays.
[0103]
　　- determining channel quality
　for example, the base station 100, the result of the channel estimation (i.e., the channel matrix) based on, determining the CQI of each combination of sub-arrays (i.e., indicator of channel quality).
[0104]
　　- report of channel quality
　for example, the terminal apparatus 200 (control unit 243) reports the channel quality information indicating the channel quality of the two or more sub-arrays to the base station 100. For example, the channel quality information is CQI.
[0105]
　Thus, for example, base station 100, it is possible to know the channel quality for the combination of sub-arrays.
[0106]
　(B) Specific examples of the report information
　12 are explanatory views for explaining an example of a report information terminal apparatus 200 reports to the base station 100 in the embodiment of the present disclosure. Referring to FIG. 12, and report information 50 is shown to the terminal device 200 reports to the base station 100. In this example, report information 50, a combination of desired sub-array of multilayer MIMO (i.e., an array antenna system) including the combination information 51 indicating the. More specifically, report information 50 includes L array antenna system (i.e., the L combinations) each combination information 51. For example, a first one first array antenna system of the subarray 2, second second array antenna system includes a sub-arrays 1,3,5,8, L th array antenna system includes a subarray 4,6 . Also, report information 50, subarray combinations (i.e., an array antenna system) including channel state information 53 including the weight information (PMI), the layer number information (RI) and channel quality information (CQI). Specifically, report information 50 includes L array antenna system (i.e., the L combinations) each channel state information 53.
[0107]
　The terminal device 200 includes an array antenna system (i.e., subarrays combinations) may report reporting information for each base station 100.
[0108]
　(C) Specific processing
　as specific processing, for example, the control unit 243 generates the report information. Then, the processing unit 240 (e.g., controller 243) performs transmission processing of the report information.
[0109]
　(5) combinations of subarrays candidate determining
　e.g., base station 100 (control section 153), based on the report to be performed by the terminal device 200, two or more to be used for multi-layer MIMO for the terminal device 200 to determine the combination of sub-arrays. That is, the base station 100 (control unit 153) determines the array antenna system used for multi-layer MIMO for the terminal device 200.
[0110]
　More specifically, determined, for example, base station 100 (control section 153), based on the report information reported by the terminal apparatus 200, the array antenna system (i.e., the combination of the two or more sub-arrays) to. As an example, the base station 100 (control unit 153) determines the array antenna system that enables transmission at more layers (i.e., an array antenna system with greater RI).
[0111]
　Incidentally, for example, the array antenna system (i.e., the combination of the two or more sub-arrays) does not include a sub-array of a predetermined number greater comprising one or more antenna ports in common. Thus, for example, it is possible to avoid that the power exceeds the maximum transmit power of the antenna elements PA (Power Amplifier) ​​will be assigned.
[0112]
　(6) Multilayer MIMO transceiver
　base station 100, the determined the sub-array of the combination (i.e., determined the array antenna system) were used to generate the signal to the terminal device 200 in two or more layers Send. The terminal device 200 receives a signal from the base station 100 at the two or more layers.
[0113]
　It has been described technical features in accordance with an embodiment of the present disclosure. According to embodiments of the present disclosure, the base station 100, the sub-array information indicating the plurality of sub-arrays and notifies the terminal apparatus 200, the terminal device 200, a combination of two or more sub-arrays included in the plurality of sub-arrays (i.e., the antenna array system) report. Thus, for example, it is possible to use a combination of desired sub-array for multi-layer MIMO.
[0114]
　<< 5. Flow of Process >>
　Next, with reference to FIG. 13, an example of processing according to the embodiment of the present disclosure. Figure 13 is a sequence diagram showing an example of a schematic flow of processing according to the embodiment of the present disclosure.
[0115]
　The base station 100 notifies the sub-array configuration on the terminal apparatus 200 (S401). For example, the sub-array configurations, including sub-array information, the first information on the number, the second number information, and the third number information. The sub-array information indicates a plurality of sub-arrays that can be used for multi-layer MIMO. The first number information indicates the number of sub-arrays to be combined for multi-layer MIMO (e.g., M). The second number information indicates the number of combinations of sub-arrays as a target of reporting (e.g., L). The third number information indicates the number of sub-arrays included in the plurality of sub-arrays (e.g., N).
[0116]
　The base station 100 transmits a CSI-RS (S403).
[0117]
　Terminal device 200, based on the CSI-RS transmitted by the base station 100 performs channel estimation (S405). That is, the terminal apparatus 200 calculates a channel matrix. Then, the terminal apparatus 200, estimated the channel (i.e., calculated above channel matrix) based on the sub-array combination for each of the (i.e., for each array antenna system) PMI, determines the RI and CQI (S407 ).
[0118]
　Terminal device 200 (control section 243) performs a report on a combination of two or more sub-arrays included in the plurality of sub arrays (S409). Specifically, for example, the terminal apparatus 200 (control unit 243) reports the report information to the base station 100. For example, the report information includes combined information and channel state information. The combination information indicating a combination of desired sub-array of multilayer MIMO (i.e., the antenna array system). The channel state information includes weight information about the combination of the sub-array (PMI), the layer number information (RI) and / or channel quality information (CQI).
[0119]
　Base station 100, based on the report information, determining more than one sub-array combinations used for multi-layer MIMO for the terminal device 200 (S411).
[0120]
　<< 6. Modification >>
　Next, with reference to FIGS. 14 to 21, illustrating the first to third modification of the embodiment of the present disclosure.
[0121]
　<6.1. First modification>
　First, with reference to FIGS. 14 to 16, illustrating a first modification of the embodiment of the present disclosure.
[0122]
　(1) Notification of the combination candidate information
　according to the first modification, the base station 100 (information acquiring unit 151), one or more combinations candidate of two or more sub-arrays included in the plurality of sub-arrays (i.e., to obtain the combination candidate information indicating one or more array antenna system candidates). Then, the base station 100 (control section 153) notifies the combination candidate information to the terminal apparatus 200.
[0123]
　(A) combining a candidate sub-arrays
　as an example, each of the one or more combination candidates may be a combination of sub-arrays containing only antenna port arranged in the horizontal direction. As another example, each of the one or more combination candidates may be a combination of sub-arrays containing only antenna port arranged in the vertical direction. As yet another example, each of the one or more combination candidates may be a combination of sub-arrays including the antenna port extending both horizontally and vertically.
[0124]
　(B) the content of the sub-array information
　for example, the combination candidate information includes information indicating a sub-array included in each of said one or more combinations candidate (i.e., the one or more of the array antenna system candidates). More specifically, for example, the combination candidate information includes a sub-array number of sub-arrays included in each of said one or more combinations candidate.
[0125]
　Incidentally, the combination candidate information may include identification information for identifying each of the one or more combination candidates (i.e., the one or more of the array antenna system candidates). More specifically, the sub-array information may include the one or more combinations each combination candidate number candidates (or the one or more respective array antenna system number of the array antenna system candidates).
[0126]
　(C) notification scheme
　for example, the base station 100 (control section 153), similar to the sub-array information, and notifies the combination candidate information to the terminal apparatus 200. More specifically, for example, base station 100 (control section 153) is through signaling to the terminal device 200, or, in the system information, and notifies the combination candidate information to the terminal apparatus 200.
[0127]
　(2) Specific examples of the information that the base station notifies the terminal device
　14 are first described to explain an example of information which the base station 100 notifies the terminal apparatus 200 in the modification of the embodiment of the present disclosure it is a diagram. Referring to FIG. 14, the sub-array configuration 30 is shown, which is information the base station 100 notifies the terminal apparatus 200. In this example, sub-array configuration 30 includes subarrays information 31 and the combination candidate information 37. As in the example of FIG. 11, the sub-array information 31 indicates the antenna port included in each of the available N subarrays for multi-layer MIMO (subarrays 1 ~ N). Especially, the combination candidate information 37 indicates the L-number of combination candidates of sub-arrays included in the N sub-arrays. Combination candidate 1 includes a sub-array 1 and 2, the combination candidate 2 includes a sub-arrays 1,3,5,8, combination candidates L comprises a subarray 4,6.
[0128]
　(3) report on the combination of sub-arrays candidate
　as described above, the terminal apparatus 200 (control unit 243) performs a report on a combination of two or more sub-arrays included in the plurality of sub-arrays.
[0129]
　Especially, in the first modification, the terminal device 200 (information acquiring unit 241) obtains the combination candidate information. Then, the report is a report on a combination included in the one or more combination candidates. For example, the report is a report of each channel state information of the one or more combination candidates. Alternatively, the terminal apparatus 200 (control unit 243) from among the one or more combinations candidate may select a combination of desired sub-array of multilayer MIMO, the report is a report of the combination of the desired sub-array it may be. Referring to FIG. 15, the terminal apparatus 200 will be described an example of report information to report to the base station 100.
[0130]
　Figure 15 is an explanatory diagram for explaining an example of report information terminal apparatus 200 reports to the base station 100 in the first modification of the embodiment of the present disclosure. Referring to FIG. 15, and report information 50 is shown to the terminal device 200 reports to the base station 100. In this example, report information 50, (as shown in FIG. 14) the base station 100 is illustrated by the combination candidate information 37 notified to the terminal device 200, for the sub-array of L combination candidates, the channel state information 53 including. Channel state information 53 includes weight information (PMI), the layer number information (RI) and channel quality information (CQI).
[0131]
　(4) The priority information
　said combination candidate information may indicate more than one combination candidate of two or more sub-arrays included in the plurality of sub-arrays. Base station 100 (information acquiring unit 151) may acquire the priority information indicating the priority of the two or more combination candidates. Then, the base station 100 (control unit 153) is the priority information may be notified to the terminal device.
[0132]
　On the other hand, the terminal device 200 (information acquiring unit 241) may acquire the priority information. Then, the terminal apparatus 200 (control unit 243), based on the priority information, may perform the report on the combination contained in the two or more combination candidates.
[0133]
　Figure 16 is an explanatory diagram for explaining another example of the information that the base station 100 notifies the terminal apparatus 200 in the first modification of the embodiment of the present disclosure. Referring to FIG. 16, the sub-array configuration 30 is shown, which is information the base station 100 notifies the terminal apparatus 200. In this example, sub-array configuration 30 includes subarrays information 31, the combination candidate information 37 and the priority information 39. Especially, the priority information 39 indicates the priority of L combination candidates. For example, in the priority, the combination candidate 2 is first, the combination candidate 4 is the last.
[0134]
　As described above, according to the first modification, the base station 100 (control unit 153) is the combination candidate information indicating the one or more combinations candidate, and notifies the terminal apparatus 200. Then, the terminal apparatus 200 (control unit 243) performs a report on combinations included in the one or more combination candidates. Thus, for example, the load on the terminal device 200 becomes smaller. More specifically, for example, terminal device 200, all combinations of the subarrays ( N C M in number of combinations) without, PMI for limited combination, it is sufficient to determine the like RI and / or CQI, the load on the terminal device 200 becomes smaller. Incidentally, N is the total number of sub-array, M is the number of sub-arrays included in the antenna array system.
[0135]
　<6.2. Second variant>
　Next, with reference to FIGS. 17 to 19, illustrating a second modification according to an embodiment of the present disclosure.
[0136]
　(1) Notification of group information
　according to a second variant, the base station 100 (information acquiring unit 151) of the plurality of sub-arrays, the directional beam of the multi-layer MIMO in the same radial formation It acquires the group information indicating a group of two or more subarrays. Then, the base station 100 (control section 153) notifies the group information to the terminal apparatus 200.
[0137]
　Group (a) sub-array
　according to the second modification, two or more sub-arrays to form a directional beam to the same radial direction in the multi-layer MIMO are belonging to the same group. In other words, two or more sub-arrays the same weight set in the multi-layer MIMO is applied, belonging to the same group. Referring to FIGS. 17 to 22, an example of sub-array groups.
[0138]
　(A-1) First Example
　FIGS. 17 and 18 are explanatory views for explaining a first example of sub-array groups.
[0139]
　Referring to FIG. 17, there is shown a directional antenna 8 × 8. For example, as sub-arrays, of eight vertically adjacent subarrays 341 and 342 respectively including antenna port, the sub-arrays 343 and 344 each including eight antenna ports arranged in the horizontal direction, the horizontal and vertical direction each of the three antennas the port is 3 sub-array of × 3 345,346 and is ready to line up. In this example, sub-array 341 and 342 belong to one group, the sub-array 343 and 344 belong to a different group, still belong to another group subarrays 345 and 346.
[0140]
　Referring to FIG. 18, there is shown a sub-array number and group number. Sub-array number of sub-arrays 341 to 346 are, respectively, 1 to 6. Sub-arrays 341 and 342 sub-array number is 1 and 2, group number belongs to a group 1. Subarrays 343, 344 subarray number is 3, 4, the group number belongs to the group is two. Sub-arrays 345 and 346 sub-array number is 5, 6, belonging to the group group number is 3.
[0141]
　(A-2) Second Example
　Figure 19 and Figure 20 is an explanatory diagram for explaining a second example of sub-array groups.
[0142]
　Referring to FIG. 19, there is shown a directional antenna 8 × 8. For example, the sub-arrays, subarrays 351, 352, 353 and 354 comprising eight antenna ports arranged in the vertical direction and the sub-arrays in the horizontal and vertical directions for each three antenna ports are arranged 3 × 3 355,356,357 , 358 and are prepared. In this example, the sub-array 351, 352, 353 and 354 belong to one group, the sub-array 355,356,357,358 belongs to another group.
[0143]
　Referring to FIG. 20, there is shown a sub-array number and group number. Subarray number of subarrays 351-358 are each 1-8. Sub-arrays 351-354 sub-array number is 1 to 4, the group number belongs to a group 1. Sub-arrays 355-358 sub-array number is in the range of 5 to 8, the group number belongs to a group is two.
[0144]
　(A-3) Third Example
　Figure 21 and Figure 22 is an explanatory diagram for explaining a third example of sub-array groups.
[0145]
　Figure 21 is an explanatory diagram for explaining a first example of sub-array groups. Referring to FIG. 21, there is shown a directional antenna 8 × 8. For example, the sub-arrays, subarrays 361, 362, 363 comprising eight antenna ports arranged in the vertical direction (eight antenna elements) respectively, the sub-array 365 includes eight antenna ports arranged in the horizontal direction (eight antenna elements) respectively, and 366 and 367 are prepared. In this example, the sub-array 361, 362, 363 belong to one group, sub-arrays 365,366,367 belongs to another group.
[0146]
　Referring to FIG. 22, there is shown a sub-array number and group number. Sub-array number of sub-arrays 361 to 367 are, respectively, 1 to 6. Sub-arrays 361-363 sub-array number is 1 to 3, group number belongs to a group 1. Sub-arrays 365-367 sub-array number is 4 to 6, the group number belongs to a group is two.
[0147]
　(B) the contents of the group information
　for example, the group information is information indicating each belonging group of the plurality of sub-arrays. More specifically, for example, the group information includes a group number of the group to which each of said plurality of subarrays belong. That is, the group information indicates, for example, information as shown in FIGS. 18, 20 and 22.
[0148]
　(C) notification scheme
　for example, the base station 100 (control section 153), similar to the sub-array information, and notifies the group information to the terminal apparatus 200. More specifically, for example, base station 100 (control section 153) is through signaling to the terminal device 200, or, in the system information and notifies the group information to the terminal apparatus 200.
[0149]
　(3) Specific examples of the information that the base station notifies the terminal apparatus
　23 are described base station 100 in the second modification of the embodiment of the present disclosure for explaining an example of information to be notified to the terminal device 200 it is a diagram. Referring to FIG. 23, the sub-array configuration 30 is shown, which is information the base station 100 notifies the terminal apparatus 200. In this example, sub-array configuration 30 includes subarrays information 31, the combination candidate information 37 and group information 41. As in the example of FIG. 14, the sub-array information 31 indicates the antenna port included in each of the available N subarrays for multi-layer MIMO (subarrays 1 ~ N). Further, the combination candidate information 37 indicates the L-number of combination candidates of sub-arrays included in the N sub-arrays. Especially, the group information 41 indicates each belongs group of N subarrays (subarrays 1 ~ N). For example, sub-array 1 and 2 belong to group 1, sub-array 3 and 4, belongs to the group 2, the sub-array 5 and 6 belong to the group 3.
[0150]
　(4) Determination of weight sets
　in the second modification, the terminal device 200 (information acquiring unit 241) obtains the group information. Then, the terminal apparatus 200 (control unit 243), based on the group information, to determine a set of weights to obtain for the above groups, the directivity. That is, the terminal apparatus 200 (control unit 243) are in groups, to determine the weight set (PMI) of for obtaining a directivity.
[0151]
　Here, the weight sets for obtaining the directivity may be a weight set for obtaining a horizontal directivity, may be weight set for obtaining a vertical directionality, these weights it may be a set of pairs. Alternatively, the weight set for obtaining the directivity may be weight set to obtain both directivity of the horizontal and vertical directions.
[0152]
　As an example, referring again to FIG. 17, the terminal apparatus 200 (control unit 243), for the sub-arrays 341 and 342, to determine the weight set (PMI) of for obtaining the vertical directivity. The terminal device 200 (control unit 243), for the sub-arrays 343 and 344, to determine the weight set (PMI) of for obtaining a horizontal directivity. The terminal device 200 (control unit 243), for the sub-arrays 345 and 346, to determine the weight set (PMI) of for obtaining a horizontal and vertical directivity.
[0153]
　Thus, for example, the terminal device 200 needs not to calculate a set of weights for obtaining the directivity for each subarray. Therefore, the load of the terminal apparatus 200 can be mitigated. Further, among the sub-arrays to be formed directional beams to the same radial direction, it is possible to differ weight set (different PMI) to avoid that would be determined.
[0154]
　(5) Report of weight sets
　as described above, the terminal apparatus 200 (control unit 243) performs a report on a combination of two or more sub-arrays included in the plurality of sub-arrays.
[0155]
　In the second modification, for example, the report includes a report of the weight sets for the above group (i.e., weight set for obtaining the directivity). For example, the terminal apparatus 200 (control unit 243) reports the weight set (PMI) of about the group to the base station 100. For example, the terminal apparatus 200 (control unit 243), for each sub-array group, the weight set (PMI) of for obtaining a directional base station reports to 100.
[0156]
　Further, for example, terminal device 200, weight set (the PMI) for adjusting the phase between the two or more sub-arrays included in the group is also reported to the base station 100. For example, the terminal device 200 reports each subarray groups, the weight set (PMI) of for obtaining the directivity, and a weight set for adjusting the phase between the sub-arrays (PMI) of the base station 100 to.
[0157]
　Thus, for example, information to be reported is reduced by the terminal apparatus 200, the overhead can be reduced.
[0158]
　<6.3. Third Modification>
　Next, with reference to FIGS. 24 and 25, illustrating a third modification of the embodiment of the present disclosure.
[0159]
　In the third modification, the plurality of sub-arrays, two including a set of two or more sub-arrays containing less antenna port (less antenna elements), more antenna ports (more antenna elements) and a set of more sub-arrays. Referring to FIGS. 20 and 21, an example of a set of such sub-arrays.
[0160]
　Figure 24 is an explanatory diagram for explaining an example of a set of sub-arrays containing less antenna port. Referring to FIG. 24, an antenna port 10 × 10, a set of two sub-arrays 371 and 373 are shown. Subarrays 371 and subarray 373 are sub-array including nine antenna ports. Since the subarrays 371 and subarray 373 comprises less antenna port may be located remote from one another. That is, it is possible to reduce the correlation between sub-arrays 371 and subarray 373.
[0161]
　Figure 25 is an explanatory diagram for explaining an example of a set of sub-arrays containing more antenna ports. Referring to FIG. 25, an antenna port 10 × 10, a set of two sub-arrays 381, 383 are shown. Subarrays 381 and subarray 383 are sub-array comprising 64 antenna ports. Subarrays 381 and subarray 383, because it contains a lot of antenna ports, it can not be located remote from one another. Therefore, the correlation of the sub-array 371 and the sub-arrays 373 increases.
[0162]
　As an example, the base station 100, more an antenna port the two or more be used subarrays many number of layers (e.g., greater RI) as long as can be ensured, including more antenna ports using the above two or more sub-arrays. Thus, for example, it is possible to suppress interference by forming a sharp directional beam.
[0163]
　As another example, the base station 100, using the two or more sub-arrays containing more antenna ports many number of layers (e.g., greater RI) if the can not be ensured, the containing less antenna port using two or more of the sub-arrays. Thus, for example, the number more layers can be ensured.
[0164]
　In this manner, according to the third modification, for example, the appropriate sub-array may be selected for each terminal device 200. As a result, the interference is suppressed, and / or more the number of layers can be ensured.
[0165]
　<< 7. Applications >>
　according to the disclosed technique is applicable to various products. For example, base station 100 may be implemented as a macro eNB or any type of eNB, such as small eNB (evolved Node B). Small eNB may pico eNB, such as micro eNB or Home (femto) eNB, or a eNB to cover smaller cells than macrocells. Alternatively, the base station 100 may be implemented as a base station for other types, such as NodeB or BTS (Base Transceiver Station). The base station 100 includes a main body (also referred to as a base station device) that controls the wireless communication, one or more RRH placed in a different location from the main body (Remote Radio Head) and may contain. Further, by different types of terminal to be described later to perform a temporary or semi-permanent base station function, it may operate as the base station 100. Moreover, at least some of the components of the base station 100 may be implemented in the module for a base station apparatus or base station apparatus.
[0166]
　In addition, for example, the terminal device 200, a smart phone, a tablet PC (Personal Computer), notebook PC, a portable game terminal, portable / dongle type mobile router or mobile terminal, such as a digital camera or a vehicle-mounted terminal such as a car navigation device, it may be implemented as. The terminal device 200 may be implemented as M2M (Machine To Machine) (also called MTC (Machine Type Communication) terminal) terminal that performs communications. Moreover, at least some of the components of the terminal apparatus 200, the module to be mounted on these terminals (e.g., configured as integrated circuit modules in a single die) may be implemented in.
[0167]
　<7.1. Applications for the base station Example>
　(1) first application example
　Figure 26 is a block diagram showing a first example of a schematic configuration of an eNB of the technology according to the present disclosure may be applied. eNB800 has one or more antennas 810, and the base station apparatus 820. Each antenna 810 and base station apparatus 820 may be connected to each other via a RF cable.
[0168]
　Each antenna 810, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by the base station apparatus 820. eNB800 has a plurality of antennas 810 as shown in FIG. 26, a plurality of antennas 810, for example, may correspond to a plurality of frequency bands eNB800 uses. Although in FIG. 26 shows an example in which ENB800 has a plurality of antennas 810, ENB800 may have a single antenna 810.
[0169]
　The base station apparatus 820 includes a controller 821, a memory 822, a network interface 823 and a wireless communication interface 825.
[0170]
　The controller 821 may be, for example, a CPU DSP, or to operate the various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821, the data from the plurality of baseband processor generates the bundled packets by bundling the generated bundled packets may be transferred. The controller 821, radio resource management (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), executes the control such as the inflow control (Admission Control) or scheduling (Scheduling) Logical it may have a function. Further, the control may be performed in conjunction with the periphery of the eNB or the core network node. Memory 822 includes RAM and ROM, and stores a program executed, and various control data (e.g., terminal list, such as the transmission power data and scheduling data) by the controller 821.
[0171]
　Network interface 823 is a communication interface for connecting the base station apparatus 820 to the core network 824. Controller 821 via the network interface 823 may communicate with the core network node, or other eNB. In that case, the ENB800, the core network node, or other eNB, may be connected to one another by logical interfaces (e.g., S1 interface or X2 interface). Network interface 823 may be a wired communication interface, or a wireless communication interface for wireless backhaul. If the network interface 823 is a wireless communication interface, a network interface 823 may use a higher frequency band than the frequency band used for radio communication by the wireless communication interface 825.
[0172]
　Wireless communication interface 825, LTE supports either a cellular communication system such as (Long Term Evolution) or LTE-Advanced, via the antenna 810 to provide wireless connectivity to the terminal located in the cell of ENB800. Wireless communication interface 825 typically may include such baseband (BB) processor 826 and RF circuit 827. BB processor 826, for example, the encoding / decoding may be performed such as modulation / demodulation and multiplexing / demultiplexing, each layer (e.g., L1, MAC (Medium Access Control), RLC (Radio Link Control) and PDCP (Packet Data Convergence Protocol)) to perform various signal processing. BB processor 826, instead of the controller 821 may include some or all of the logical functions described above. BB processor 826, a memory for storing a communication control program may be a module including a processor and associated circuitry to execute the program, the function of BB processor 826 may be changeable by the update of the program good. Further, the module may be a card or a blade is inserted into the slot of the base station apparatus 820, or may be a chip mounted on said card or the blade. On the other hand, RF circuit 827, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 810.
[0173]
　Wireless communication interface 825 includes a plurality of BB processor 826 as shown in FIG. 26, a plurality of BB processor 826 may, for example, correspond to a plurality of frequency bands eNB800 uses. The wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 26, a plurality of RF circuits 827 may correspond for example to a plurality of antenna elements. Although the wireless communication interface 825 in FIG. 26 shows an example including a plurality of BB processor 826 and a plurality of RF circuits 827, a wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827 But good.
[0174]
　In eNB800 shown in FIG. 26, the information acquisition unit 151 and / or the control unit 153 described with reference to FIG. 4 may be implemented in a wireless communication interface 825. Alternatively, at least some of these components may be implemented in the controller 821. As an example, ENB800 is part of a wireless communication interface 825 (e.g., BB processor 826) or the whole, and / or equipped with a module including a controller 821, the information acquisition unit 151 and / or the control unit 153 in the module is mounted it may be. In this case, the module is a program for executing in other words the program (for causing a processor as an information acquiring unit 151 and / or the control unit 153, the operation of the information processor acquiring unit 151 and / or the control unit 153 ) stores may execute the program. As another example, a program for causing a processor as an information acquiring unit 151 and / or the control unit 153 is installed in ENB800, wireless communication interface 825 (e.g., BB processor 826) and / or controller 821 executes the program it may be. As described above, the information acquisition unit 151 and / or controller 153 ENB800 as a device comprising a may be the base station device 820 or the module is provided, to function processor as an information acquiring unit 151 and / or the control unit 153 the program may be provided for. The readable recording medium recording the program may be provided.
[0175]
　Further, in eNB800 shown in FIG. 26, the radio communication unit 120 described with reference to FIG. 4, a wireless communication interface 825 (e.g., RF circuitry 827) may be implemented in. The antenna unit 110 may be implemented in the antenna 810. The network communication unit 130 may be implemented in the controller 821 and / or network interface 823.
[0176]
　(2) a second application example
　Figure 27 is a block diagram showing a second exemplary configuration of an eNB of the technology according to the present disclosure may be applied. eNB830 has one or more antennas 840, the base station apparatus 850, and RRH860. Each antenna 840 and RRH860 may be connected to each other via a RF cable. The base station apparatus 850 and RRH860 may be connected to one another by high-speed line such as an optical fiber cable.
[0177]
　Each antenna 840, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by RRH860. eNB830 has a plurality of antennas 840 as shown in FIG. 27, a plurality of antennas 840, for example, may correspond to a plurality of frequency bands eNB830 uses. Although in FIG. 27 shows an example in which ENB830 has a plurality of antennas 840, ENB830 may have a single antenna 840.
[0178]
　The base station apparatus 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855 and connection interface 857. Controller 851, a memory 852 and a network interface 853 is similar to the controller 821, a memory 822 and a network interface 823 described with reference to FIG. 26.
[0179]
　Wireless communication interface 855 supports any of the cellular communication system such as LTE or LTE-Advanced, via the RRH860 and antenna 840 to provide wireless connectivity to terminals located in a sector corresponding to RRH860. Wireless communication interface 855 typically may include such BB processor 856. BB processor 856, except that it is connected to the RF circuitry 864 of RRH860 through the connection interface 857 is similar to the BB processor 826 described with reference to FIG. 26. Wireless communication interface 855 includes a plurality of BB processor 856 as shown in FIG. 27, a plurality of BB processor 856 may, for example, correspond to a plurality of frequency bands eNB830 uses. Although the wireless communication interface 855 in FIG. 27 shows an example including a plurality of BB processor 856, a wireless communication interface 855 may comprise a single BB processor 856.
[0180]
　Connection interface 857 is an interface for base station apparatus 850 (the radio communication interface 855) connected to the RRH860. Connection interface 857 may be a communication module for communicating with the high-speed line which connects the base station apparatus 850 (wireless communication interface 855) and RRH860.
[0181]
　Further, RRH860 comprises a connection interface 861 and a wireless communication interface 863.
[0182]
　Connection interface 861 is an interface for connecting to the base station apparatus 850 RRH860 (wireless communication interface 863). Connection interface 861 may be a communication module for communicating with the high-speed line.
[0183]
　Wireless communication interface 863 sends and receives radio signals via an antenna 840. Wireless communication interface 863 may typically include an RF circuit 864. RF circuit 864, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 840. Wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 27, a plurality of RF circuits 864 may correspond for example to a plurality of antenna elements. Although the wireless communication interface 863 in FIG. 27 shows an example including a plurality of RF circuits 864, a wireless communication interface 863 may comprise a single RF circuit 864.
[0184]
　In eNB830 shown in FIG. 27, the information acquisition unit 151 and / or the control unit 153 described with reference to FIG. 4 may be implemented in a wireless communication interface 855 and / or wireless communication interface 863. Alternatively, at least some of these components may be implemented in the controller 851. As an example, ENB830 is part of a wireless communication interface 855 (e.g., BB processor 856) or the whole, and / or equipped with a module including a controller 851, the information acquisition unit 151 and / or the control unit 153 in the module is mounted it may be. In this case, the module is a program for executing in other words the program (for causing a processor as an information acquiring unit 151 and / or the control unit 153, the operation of the information processor acquiring unit 151 and / or the control unit 153 ) stores may execute the program. As another example, a program for causing a processor as an information acquiring unit 151 and / or the control unit 153 is installed in ENB830, wireless communication interface 855 (e.g., BB processor 856) and / or controller 851 executes the program it may be. As described above, the information acquisition unit 151 and / or controller 153 ENB830 as a device comprising a may be the base station device 850 or the module is provided, to function processor as an information acquiring unit 151 and / or the control unit 153 the program may be provided for. The readable recording medium recording the program may be provided.
[0185]
　Further, in eNB830 shown in FIG. 27, for example, wireless communication unit 120 described with reference to FIG. 4, a wireless communication interface 863 (e.g., RF circuitry 864) may be implemented in. The antenna unit 110 may be implemented in the antenna 840. The network communication unit 130 may be implemented in the controller 851 and / or network interface 853.
[0186]
　<7.2. Applications> about the terminal device
　(1) first application example
　Figure 28 is a block diagram showing an example of a schematic configuration of the smartphone 900 technology according to the present disclosure may be applied. Smartphone 900, processor 901, memory 902, storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, display device 910, a speaker 911, a wireless communication interface 912,1 one or more of the antenna switch 915 comprises one or more antennas 916, bus 917, battery 918 and the auxiliary controller 919.
[0187]
　The processor 901 may be, for example, a CPU or SoC (System on Chip), which controls the functions of the application layer and other layers of the smartphone 900. Memory 902 includes RAM and ROM, for storing programs and data executed by the processor 901. Storage 903 may include a storage medium such as a semiconductor memory or a hard disk. External connection interface 904 is an interface for connecting an external device such as a memory card or USB (Universal Serial Bus) device to a smart phone 900.
[0188]
　The camera 906 is, for example, an image pickup element such as CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image. Sensor 907 may include, for example, the positioning sensor, a gyro sensor, the sensor group, such as a geomagnetic sensor and an acceleration sensor. The microphone 908 converts a voice inputted to the smartphone 900 to the audio signal. Input device 909, for example, a touch sensor, a keypad for detecting a touch to the screen of the display device 910, a keyboard includes a button or switch, and accepts an operation or information input from a user. Display device 910 has a screen such as a liquid crystal display (LCD) or organic light emitting diode (OLED) display, and displays the output image of the smartphone 900. Speaker 911 converts the audio signal output from the smart phone 900 to the audio.
[0189]
　Wireless communication interface 912 supports any of the cellular communication system such as LTE or LTE-Advanced, which executes wireless communication. Wireless communication interface 912 typically may include such BB processor 913 and RF circuit 914. BB processor 913, for example, the encoding / decoding may be performed such as modulation / demodulation and multiplexing / demultiplexing, execute various signal processing for wireless communication. On the other hand, RF circuit 914, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 916. Wireless communication interface 912 may be a one-chip module that integrates BB processor 913 and RF circuit 914. Wireless communication interface 912 may include a plurality of BB processor 913 and a plurality of RF circuits 914 as shown in FIG. 28. Although the wireless communication interface 912 in FIG. 28 shows an example including a plurality of BB processor 913 and a plurality of RF circuits 914, a wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914 But good.
[0190]
　Further, the wireless communication interface 912, in addition to cellular communication systems, short-range wireless communication system, other types of wireless communication systems, such as the proximity wireless communication system or wireless LAN (Local Area Network) system may support, in this case, it may include a BB processor 913 and RF circuit 914 for each wireless communication system.
[0191]
　Each of the antenna switch 915, a plurality of circuits included in the wireless communication interface 912 (e.g., different circuits for wireless communication system) switches the connection destination of the antenna 916 between.
[0192]
　Each antenna 916, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by the wireless communication interface 912. Smartphone 900 may have a plurality of antennas 916 as shown in FIG. 28. Although in FIG. 28 shows an example where the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.
[0193]
　Moreover, the smartphone 900 may comprise an antenna 916 for each wireless communication system. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.
[0194]
　Bus 917, a processor 901, memory 902, storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, display device 910, a speaker 911, connects the wireless communication interface 912 and the auxiliary controller 919 to each other . Battery 918 via a power supply line partially indicated by broken lines in the figure, supplies power to each block of the smartphone 900 shown in FIG. 28. Auxiliary Controller 919, for example, in the sleep mode, to operate the required minimum functionality of the smartphone 900.
[0195]
　In the smartphone 900 shown in FIG. 28, the information acquisition unit 241 and / or the control unit 243 described with reference to FIG. 5 may be implemented in a wireless communication interface 912. Alternatively, at least some of these components may be implemented in the processor 901 or the auxiliary controller 919. As an example, a smart phone 900, a portion of the wireless communication interface 912 (e.g., BB processor 913) or the whole, the processor 901, and / or a module including an auxiliary controller 919 is mounted, the information acquisition unit 241 and / or in the module controller 243 may be implemented. In this case, the module is a program for executing in other words the program (for causing a processor as an information acquiring unit 241 and / or the control unit 243, the operation of the information processor acquiring unit 241 and / or the control unit 243 ) stores may execute the program. As another example, a program for causing a processor as an information acquiring unit 241 and / or the control unit 243 is installed on the smartphone 900, a wireless communication interface 912 (e.g., BB processor 913), a processor 901, and / or auxiliary controller 919 may execute the program. As described above, the device comprising information acquisition unit 241 and / or controller 243 may be provided smart phone 900 or the module is a program for causing a processor as an information acquiring unit 241 and / or the control unit 243 it may be provided. The readable recording medium recording the program may be provided.
[0196]
　Further, in a smart phone 900 shown in FIG. 28, for example, wireless communication unit 220 described with reference to FIG. 5, the radio communication interface 912 (e.g., RF circuitry 914) may be implemented in. The antenna unit 210 may be implemented in the antenna 916.
[0197]
　(2) a second application example
　Figure 29 is a block diagram showing an example of a schematic configuration of the car navigation device 920 technology according to the present disclosure may be applied. Car navigation device 920, processor 921, memory 922, GPS (Global Positioning System) module 924, sensor 925, data interface 926, content player 927, a storage medium interface 928, an input device 929, display device 930, a speaker 931, a wireless communication an interface 933,1 one or more of the antenna switch 936,1 or more antennas 937 and battery 938.
[0198]
　The processor 921 may be, for example, a CPU or SoC, controls the navigation functions and other functions of the car navigation device 920. Memory 922 includes RAM and ROM, for storing programs and data executed by the processor 921.
[0199]
　GPS module 924 uses the GPS signal received from the GPS satellites, measures the position of the car navigation device 920 (e.g., latitude, longitude and altitude). Sensor 925 is, for example, a gyro sensor may include sensors such as a geomagnetic sensor, and pressure sensor. Data interface 926 is connected to, for example, vehicle network 941 through a terminal (not shown), we obtain the data generated by the vehicle, such as vehicle speed data.
[0200]
　Content player 927, storage medium to be inserted into the storage medium interface 928 (e.g., CD or DVD) to reproduce the content stored in the. Input device 929 may, for example, a touch sensor for detecting a touch on the screen of the display device 930 includes a button or switch, and accepts an operation or information input from a user. Display device 930 has a screen such as an LCD or OLED display, and displays an image of content navigation function or reproducing. Speaker 931 outputs sound of content navigation function or reproducing.

The scope of the claims
[Claim 1]
　An acquisition unit that acquires subarray information indicating a plurality of sub-arrays that can be used, for multi-layer MIMO (Multi-Input Multi-Output)
　, a control unit for notifying the sub-array information to the terminal device
device comprising a.
[Claim 2]
　The subarray information includes information indicating an antenna port included in each of the plurality of sub-arrays, according to claim 1.
[Claim 3]
　The subarray information includes identification information for identifying each of the plurality of sub-arrays, according to claim 1.
[Claim 4]
　Wherein the acquisition unit acquires the first information on the number of indicating the number of sub-arrays to be combined for multi-layer MIMO,
　the control unit notifies the first information on the number of the terminal device,
in claim 1 the apparatus according.
[Claim 5]
　The terminal device, the a plurality of terminal devices that report for two or more sub-arrays of combinations contained in the sub-array,
　the acquisition unit, second information on the number of indicating the number of combinations of sub-arrays of interest reported acquires,
　the control unit notifies the second information on the number of the terminal device,
according to claim 1.
[Claim 6]
　Wherein the plurality of sub-arrays comprises two or more sub-arrays that include one or more antenna ports to a common apparatus of claim 1.
[Claim 7]
　Wherein the acquisition unit acquires the combination candidate information indicating one or more combination candidates of two or more sub-arrays included in the plurality of sub-arrays,
　the control unit notifies the combination candidate information to the terminal device,
apparatus according to claim 1.
[8.]
　The combination candidate information indicates a combination of two or more candidates for the two or more sub-arrays included in the plurality of sub-arrays,
　the acquisition unit acquires the priority information indicating the priority of the two or more combination candidates and,
　wherein the control unit notifies the priority information to the terminal device,
according to claim 7.
[Claim 9]
　The terminal device is a terminal device that performs a report on a combination of two or more sub-arrays included in the plurality of sub-arrays,
　the control part, based on the report to be performed by the terminal device, for said terminal device determining more than one combination of sub-arrays that are used for multi-layer MIMO,
according to claim 1.
[Claim 10]
　The combination of the two or more sub-arrays that are used for multi-layer MIMO for said terminal device does not include a sub-array of a predetermined number greater comprising one or more antenna ports to a common, according to claim 9 apparatus.
[Claim 11]
　The acquisition unit, of the plurality of sub-arrays, and acquires the group information indicating a group of two or more sub-arrays to form a directional beam to the same radial direction in the multi-layer MIMO,
　the control unit, the and notifies the group information to the terminal device,
according to claim 1.
[Claim 12]
　An acquisition unit that acquires subarray information indicating a plurality of sub-arrays that can be used for multi-layer MIMO,
　, and a control unit for performing a report on a combination of two or more sub-arrays included in the plurality of sub-arrays
device comprising a.
[Claim 13]
　Wherein, from among the plurality of sub-arrays, select a combination of two or more sub-arrays desirable multi-layer MIMO,
　the report, the report of the combination of the two or more sub-arrays desirable Multilayer MIMO including,
apparatus according to claim 12.
[Claim 14]
　It said report includes a report of the weight set for the combination of the two or more sub-arrays, according to claim 12.
[Claim 15]
　The weight set comprises a set of weights for adjusting the phase between the two or more sub-arrays, according to claim 14.
[Claim 16]
　The report includes a number of layers of the report on the combination of the two or more sub-arrays, according to claim 12.
[Claim 17]
　The report, comprising said reporting channel quality for the combination of two or more sub-arrays, according to claim 12.
[Claim 18]
　Wherein the acquisition unit acquires the combination candidate information indicating one or more combination candidates of two or more sub-arrays included in the plurality of sub-arrays,
　the report reports of combinations contained in the one or more combinations candidate in a,
device according to claim 12.
[Claim 19]
　The combination candidate information indicates a combination of two or more candidates for the two or more sub-arrays included in the plurality of sub-arrays,
　the acquisition unit acquires the priority information indicating the priority of the two or more combination candidates and,
　the control part, based on the priority information, to report about the combination contained in the two or more combination candidates,
according to claim 18.
[Claim 20]
　The acquisition unit, of the plurality of sub-arrays, and acquires the group information indicating a group of two or more sub-arrays to form a directional beam to the same radial direction in the multi-layer MIMO,
　the control unit, the based on the group information, for said group to determine a set of weights for obtaining the directivity,
apparatus according to claim 12.