Technical field
[0001]The present invention includes a first communication device, the second communication device, a method, a program, a recording medium and system.
BACKGROUND
[0002]As the sophistication of mobile communication progresses, the more expansion of the available frequency band, higher data transmission rate is advanced. Therefore, the data transmission rate per frequency can be speeded, beamforming with multi-element antenna is considered as an effective method. In the beamforming, based on the channel estimates obtained from the received signal of each antenna element included in the multi-element antenna beam for receiving (and transmitting) are formed.
[0003]For example, Patent Document 1, the base station determines a transmission beamforming weights performs transmission beam forming, the terminal apparatus determines a reception beam forming weights is possible to perform receive beamforming are described . For example, Patent Document 2, the terminal apparatus determines a transmission antenna weights and the receiving antenna weights based on the reference signal from the base station, the information about these weights be reported to the base station, it is described there. Patent Document 3, an example of the structure of the RRU (Remote Radio Unit) and BBU (Base Band Unit) and the isolated base station is described.
CITATION
Patent Document
[0004]
Patent Document 1: WO 2016/152916
Patent Document 2: WO 2016/207929 Patent
Patent Document 3: U.S. Patent Application Publication No. 2014/0226736 Pat
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　For example, as described in Patent Document 3, the base station can be separated in the apparatus for receiving a signal through an antenna (e.g., remote RF unit) and other devices (e.g. BBU) or the like. In such a case, for example, channel estimation, generation of antenna weights, and that either the apparatus performs processing of the multiplication or the like of the antenna weights, and the circuit scale of the apparatus (e.g. remote RF unit), the inter device interface It may affect the band. However, in Patent Document 3, if these processes are either unit performs has not been studied. Therefore, in the technique described in Patent Document 3, it is impossible to suppress both the bandwidth of the circuit scale and the inter device interface of the device.
[0006]
　An object of the present invention is to provide a first communication device and a second communications apparatus that enables both suppression of a band of the circuit scale and the inter-device interface unit for receiving a signal through an antenna .
Means for Solving the Problems
[0007]
　First communication device according to one embodiment (Aspect) of the present invention, the second communication device that receives a signal via multiple antennas, channel related on the channel of a signal received via the plurality of antennas a reception processing unit for receiving information, a weight information relating to the reception antenna weights the plurality of antennas the second communication device to the signal received via the multiplies are generated based on the channel related information the weight information, and a transmission processing unit for transmitting to the second communication device.
[0008]
　Second communication device according to one embodiment of the present invention includes a wireless communication processing unit for receiving signals through a plurality of antennas, the channel related information about the channel of the signal received via the plurality of antennas the first a transmission processing unit for transmitting to the communication device, a weight information related to the reception antenna weight, the weight information generated based on the channel related information, a reception processing unit for receiving from the first communication device, comprising a, the wireless communication processing unit multiplies the reception antenna weights to signals received via the plurality of antennas.
[0009]
　The first method according to an embodiment of the present invention are that a communication device that receives a signal via a plurality of antennas, receives the channel related information about the channel of the signal received via the plurality of antennas, a weight information relating to the reception antenna weights to the signal received via the plurality of antennas the communication device multiplies, the weight information generated based on the channel related information, can be transmitted to the communication device and, including the.
[0010]
　The second method according to an embodiment of the present invention includes receiving a signal via a plurality of antennas, to transmit the channel related information about the channel of the signal received via the plurality of antennas to the communication device When, a weight information related to the reception antenna weight, the weight information generated based on the channel related information, receiving from the communication device, the received signal received via the plurality of antennas It includes multiplying the antenna weights, a.
[0011]
　First program according to an embodiment of the present invention are that a communication device that receives a signal via a plurality of antennas, receives the channel related information about the channel of the signal received via the plurality of antennas, a weight information relating to the reception antenna weights to the signal received via the plurality of antennas the communication device multiplies, the weight information generated based on the channel related information, can be transmitted to the communication device When a program to be executed by the processor.
[0012]
　Second program according to an embodiment of the present invention includes receiving a signal via a plurality of antennas, to transmit the channel related information about the channel of the signal received via the plurality of antennas to the communication device When, a weight information related to the reception antenna weight, the weight information generated based on the channel related information, receiving from the communication device, the received signal received via the plurality of antennas and multiplying the antenna weights, which is a program to be executed by the processor.
[0013]
　First recording medium according to one aspect of the present invention are that a communication device that receives a signal via a plurality of antennas, receives the channel related information about the channel of the signal received via the plurality of antennas , a weight information relating to the reception antenna weights to the signal received via the plurality of antennas the communication device multiplies, the weight information generated based on the channel related information is transmitted to the communication device it and a non-transitory recording medium readable to a computer which records a program to be executed by the processor.
[0014]
　Second recording medium according to one aspect of the present invention transmits and receiving signals through a plurality of antennas, the channel related information about the channel of the signal received via the plurality of antennas to the communication device it and, a weight information related to the reception antenna weight, the weight information generated based on the channel related information, receiving from the communication device, the on signals received via the plurality of antennas and multiplying the reception antenna weight, a non-transitory recording medium readable to a computer which records a program to be executed by the processor.
[0015]
　System according to one embodiment of the present invention includes a first communication device, a second communication device, and the second communication apparatus receives a signal via a plurality of antennas, the plurality of antennas sending channel related information about the channel of the signal received to the first communication device via the said first communication device receives the channel related information from the second communication device, the receiving antenna weights a weight information relating to, the weight information generated based on the channel related information, said second transmitted to the communication device, said second communication device, the weight information to the first communication device received from, it multiplies the reception antenna weights to signals received via the plurality of antennas.
[0016]
　A third method according to an embodiment of the present invention, in the second communication device, receiving a signal via a plurality of antennas, channel related information on the channel of the signal received via the plurality of antennas and transmitting to the first communication device, in the first communication device, receiving the channel-related information from the second communication device, a weight information related to the reception antenna weight, the channel related the weight information generated on the basis of the information, and transmitting to the second communication device, in the second communication device, receiving the weight information from the first communication device, the plurality the signal received through the antenna; and a multiplying the reception antenna weight.
The invention's effect
[0017]
　According to the present invention allows the suppression of both the bandwidth of the circuit scale and the inter-device interface unit for receiving a signal through an antenna. Incidentally, the present invention, instead of the effect, or together with the effect, may be other advantages are achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
FIG. 1 is an explanatory diagram for explaining an example of a configuration of a base station using a multi-element antenna.
Is an explanatory diagram for explaining a first process disposition case of FIG. 2 the base station.
3 is an explanatory diagram for explaining a second processing arrangement case of the base station.
FIG. 4 is an explanatory diagram showing an example of a schematic configuration of a system according to the first embodiment.
FIG. 5 is an explanatory diagram showing an example of a schematic configuration of a base station according to the first embodiment.
6 is a block diagram showing an exemplary configuration of the digital device according to the first embodiment.
7 is a block diagram showing an example of a schematic configuration of a radio apparatus according to the first embodiment.
8 is an explanatory view for explaining a schematic example of a wireless communication process of the first embodiment.
9 is an explanatory diagram for explaining a first example of a channel estimation and weighting information generating of the first embodiment.
FIG. 10 is an explanatory diagram for explaining an example of a reference signal of the first embodiment.
11 is an explanatory diagram for explaining an example of transmission of a reference signal of the first embodiment.
FIG. 12 is an explanatory diagram for explaining a second example of a channel estimation and weighting information generating of the first embodiment.
13 is a sequence diagram for explaining an example of a schematic flow of radio communication processing according to the first embodiment.
14 is a sequence diagram for explaining an example of a schematic flow of processing of the transmit and receive channel related information and weight information according to the first embodiment.
FIG. 15 is an explanatory diagram showing an example of a schematic configuration of a system according to the second embodiment.
16 is a block diagram showing an example of a schematic configuration of a first communication apparatus according to the second embodiment.
17 is a block diagram showing an example of a schematic configuration of a second communication apparatus according to the second embodiment.
DESCRIPTION OF THE INVENTION
[0019]
　Hereinafter will be described with reference to the accompanying drawings of embodiments of the present invention in detail. In the specification and the drawings, elements that can be similarly described, repeated description may be omitted by referring to the figures.
[0020]
　Description is performed in the following order.
　1. Related technology
　2. Outline of Embodiment
　3. The first embodiment
　　3.1. Configuration system of
　　3.2. The configuration of the digital device
　　3.3. The configuration of the wireless devices
　　3.4. Technical features
　　3.5. Modification
　4. Second Embodiment
　　4.1. Configuration system of
　　4.2. Configuration of the first communication device
　　4.3. Configuration of the second communication device
　　4.4. Technical features
[0021]
　<< 1. Related Art >>
　First, with reference to FIGS. 1 to 3, illustrating the related art. Incidentally, may be included in embodiments of course, related technologies present invention described herein.
[0022]
　- Example of the configuration of a base station using a multi-element antenna
　Figure 1 is an explanatory diagram for explaining an example of a configuration of the base station 50 to use a multi-element antenna.
[0023]
　- reception processing
　radio reception signal of the N antenna elements 51 included in the multi-element antenna (wireless reception signals of N series) is the transceiver unit 53 is converted into a received baseband signal of N series on the time axis, in addition, the FFT (Fast Fourier transform) section 55, and is converted into received signals of N channels on the frequency axis. Further, the received signal of the N series, the antenna weight multiplying unit 57, is multiplied by the reception antenna weight matrix with M rows and N columns. As a result, the reception signal of the M-sequence (i.e., the received signal of M layer) is output. Received signal of the M sequence is demodulated by the demodulator 59, it is further decoded by the decoding unit 61.
[0024]
　The channel estimation unit 63, based on the reference signal included in the received signal of said N series which is the output of the FFT unit 55 performs channel estimation. Thus, the channel estimation value of the N sequence is generated and output. Furthermore, the antenna weight generating unit 65, based on the channel estimation value of the N sequence, to produce a receiving antenna weight matrix with M rows and N columns. Then, the reception antenna weight matrix may be used by the antenna weight multiplying unit 57, as described above. The antenna weight generating unit 65, based on the channel estimation value of the N sequences may be generated also transmit antenna weight matrix with N rows and L columns.
[0025]
　- transmission processing
　transmission signal is first encoded by the encoding unit 71 and is then modulated by the modulation unit 73. As a result, the transmission signal is a transmission signal of the L series (transmission signal of L layer). Transmission signal of the L series, the antenna weight multiplying unit 75 is multiplied by the transmission antenna weight matrix with N rows and L columns, the transmission signals of N sequences on the frequency axis. Transmission signal of the N channels on the frequency axis, IFFT by (Inverse Fast Fourier Transform) section 77, is converted to a baseband signal N sequence on the time axis, further, the transceiver unit 53, a radio transmission signal of N series It is converted to. Then, the radio transmission signal of the N channels is transmitted from the N antenna elements included in the multi-element antenna.
[0026]
　- processing arrangement in the base station
　in actual operation, the base station 50 in the example of FIG. 1 includes, for example, a wireless device including a transceiver 53, demodulator 59, decoder 61, the encoding unit 71 and modulation unit 73 It is divided into a digital device. For example, the wireless device is located in the immediate vicinity of the multi-element antenna, the digital device is located indoors in a station building, are connected to each other by an optical fiber cable with the wireless device and the digital device.
[0027]
　Here, a case (first processing arrangement case) that the antenna weight multiplier unit 57,75 and the antenna weight generating section 65 is disposed in a digital device, the antenna weight multiplier unit 57,75 and the antenna weight generating section 65 is a wireless device a case (second processing arrangement cases) arranged is considered.
[0028]
　- first processing arrangement Case
　Figure 2 is an explanatory diagram for explaining a first process disposition case of the base station 50. In this example, the antenna weight multiplying unit 57,75, the channel estimation unit 63 and the antenna weight generator 65 is disposed in the digital device 90 rather than the wireless device 80.
[0029]
　In the first processing arrangement case, the circuit scale of the radio apparatus 80 is small, compact and lightweight wireless device 80 is easier. However, in this case, between the wireless device 80 and the digital device 90, the interface for signals of each the N series of transmission and reception (i.e. the N interface) is required. Therefore, when the number of antenna elements N is very large, very large bandwidth is required between the radio apparatus 80 and the digital device 90.
[0030]
　- second processing arrangement case
　3 are explanatory views for explaining a second processing arrangement case of the base station 50. In this example, the antenna weight multiplying unit 57,75, the channel estimation unit 63 and the antenna weight generator 65 is arranged in the radio device 80 rather than digital device 90.
[0031]
　In the second processing arrangement case, between the wireless device 80 and the digital device 90, the interface for signals of the M-sequence for the received (i.e. the M Interface), and an interface for signals of L sequences for the transmission ( that is the M interface) not only is required. Therefore, even when the number of antenna elements N is very large, there is no need so large bandwidth between the wireless device 80 and the digital device 90. However, since channel estimation and generation of antenna weights (especially the latter) is complex and special processing, the circuit scale of the radio device 80 is large, it is difficult to reduce the size and weight of the wireless device 80. Furthermore, channel estimation and generation of antenna weights, since processing for each user (terminal), it is necessary that the wireless device 80 performs a process aware user (terminal).
[0032]
　In view of the aforementioned points, to allow both the suppression of the band (the interface between the wireless device and the digital device) circuit scale and inter-device interface unit for receiving a signal via an antenna (wireless device) it is desired.
[0033]
　<< 2. Summary >> embodiments
　embodiment of the present invention (hereinafter, referred to as the embodiment), the wireless device receives a signal via multiple antennas (for example, a plurality of antenna elements included in the multi-element antenna). Furthermore, especially in this embodiment, the wireless device, multiplies the receive antenna weights to signals received via the plurality of antennas.
[0034]
　Furthermore, especially in this embodiment, the wireless device, the channel related information about the channel of the signal received via the plurality of antennas transmitted to a digital device, the digital device receives the channel related information. Then, based on the channel related information, weight information relating to the receiving antenna weights are generated. Further, the digital device, the weight information transmitted to the wireless device, the wireless device receives the weight information. Thereafter, the wireless device multiplies the reception antenna weights to signals received via the plurality of antennas.
[0035]
　Thus, for example, a circuit scale of the radio apparatus, both the band of the interface between the wireless device and a digital device, may be suppressed.
[0036]
　Incidentally, the above-mentioned technical features are one specific example of this embodiment, of course, the present embodiment is not limited to the technical features described above.
[0037]
　<< 3. >> first embodiment
　Subsequently, with reference to FIGS. 4 to 13, a description will be given of a first embodiment of the present invention.
[0038]
　<3.1. Configuration of System>
　First, with reference to FIGS. 4 and 5, an example of the configuration of a system 1 according to the first embodiment. Figure 4 is an explanatory diagram showing an example of a schematic configuration of a system 1 according to the first embodiment. Referring to FIG. 4, the system 1 includes a base station 10 and the terminal device 40.
[0039]
　For example, the system 1 is a system conforming to the standard of 3GPP (Third Generation Partnership Project) (standard). More specifically, the system 1 may be a system that complies with the LTE / LTE-Advanced and / or SAE (System Architecture Evolution). Alternatively, the system 1 may be a system that complies with the specifications of the fifth generation (5G). Of course, the system 1 is not limited to these examples.
[0040]
　(1) the base station 10
　the base station 10, the radio access network: a node (Radio Access Network RAN), performs radio communication with a terminal device located in the coverage area (e.g., terminal 40).
[0041]
　- Specific examples of the base station 10
　The base station 10 is a node that performs radio communication with the terminal device, in other words the radio access network: a node (Radio Access Network RAN). For example, the base station 10 may be a eNB (evolved Node B), or may be a gNB in ​​5G (generation Node B). The base station 10 may include a plurality of units (or nodes). The plurality of units (or nodes), a first unit for processing the higher protocol layers (or the first node), and a second unit for processing the lower protocol layers (or second node) it may also include a. As an example, the first unit, the central unit: may be referred to as (Center / Central Unit CU), the second unit, distribution unit (Distributed Unit: DU) or access unit (Access Unit: AU) it may be referred to as. As another example, the first unit, the digital unit: may be referred to as (Digital Unit DU), the second unit, a wireless unit (Radio Unit: RU) or remote unit (Remote Unit: RU) and it may be referred to. The DU (Digital Unit) may be a BBU (Base Band Unit), the RU can be a RRH (Remote Radio Head) or RRU (Remote Radio Unit). Of course, designation of the first unit (or the first node) and the second unit (or second node) is not limited to this example. Alternatively, the base station 10 may be a single unit (or a single node). In this case, the base station 10, one of the plurality of units (e.g., the second unit) may be, other units of the plurality of units (e.g., the first unit) it may be connected to the.
[0042]
　- configuration of the base station 10
　Figure 5 is an explanatory diagram showing an example of a schematic configuration of a base station 10 according to the first embodiment. Referring to FIG. 5, the base station 10 includes a digital device 100, the wireless device 200, and a plurality of antennas 300. For example, the base station 10 includes N antenna 300.
[0043]
　- digital device 100 and wireless device 200
　each of the digital device 100 and wireless device 200 is one of a plurality of devices constituting the base station 10. The base station 10, the digital device 100 and wireless device 200 (as well as a plurality of antennas 300) than other devices (not shown) may further comprise a.
[0044]
　Wireless device 200 is a device that is physically separate from the digital device 100. Wireless device 200 is connected to a plurality of antennas 300, the digital device 100 is connected to the wireless device 200. The digital device 100 and the wireless device 200 are connected to each other by a communication line 21. Digital device 100 via the communication line 21 to receive information from the wireless device 200 transmits information to the wireless device 200 via the communication line 21. For example, the communication line 21 is an optical fiber line. Further, for example, digital device 100 is installed indoors, the wireless device 200 is installed outdoors.
[0045]
　If the base station 10 as described above including the first unit and the second unit, the digital device 100 may be a said first unit (e.g., DU (Digital Unit) or BBU), wireless device 200 is the second unit (e.g., RU (Remote / radio unit), RRH or remote RF unit) may be. Alternatively, the digital device 100 and wireless device 200 may be a device included in said second unit (e.g., DU (Distributed Unit)).
[0046]
　The digital device 100, referred to as a digital device since the processing of the digital signal, it can be said that more generally the communication device. Further, the wireless device 200, referred to as radio apparatus since the processing of the radio signals as described later, it can be said that more generally the communication device. Of course, the wireless device 200, not only processing of the radio signals may also handles digital signals. Here, in order to facilitate understanding of the first embodiment, instead of the communication device, using the designation digital device and a wireless device.
[0047]
　- a plurality of antennas 300
　each example, the plurality of antennas 300 is an antenna element included in the multi-element antenna. For example, the multi-element antenna is an antenna for Massive MIMO (Massive Multiple-Input and Multiple -Output).
[0048]
　(2) the terminal device 40
　the terminal device 40 performs wireless communication with a base station. For example, the terminal device 40, when located within the coverage area of the base station 10 performs wireless communication with the base station 10. For example, the terminal device 40, the user equipment (User Equipment: UE), may be referred to as a user terminal or mobile station.
[0049]
　Although described only one terminal device 40 in FIG. 5, of course, it may be a plurality of terminal devices 40 are present.
[0050]
　<3.2. Configuration of the digital device>
　Next, with reference to FIG. 6, an example of the configuration of a digital device 100 according to the first embodiment. Figure 6 is a block diagram showing an exemplary configuration of the digital device 100 according to the first embodiment. Referring to FIG. 6, the digital device 100 includes an interface 110, storage unit 120 and the processing unit 130.
[0051]
　(1) interface 110
　interface 110 is an interface for communicating with the wireless device 200. In other words, the interface 110 is an interface for the communication line 21 (e.g. an optical fiber line) connecting the digital device 100 and the wireless device 200. Interface 110 receives a signal from the wireless device 200 transmits a signal to the wireless device 200.
[0052]
　(2) storage unit 120
　storage unit 120 stores a program for operation of the digital device 100 (instruction) and parameters, as well as various data temporarily or permanently stored. The program includes one or more instructions for the operation of the digital device 100.
[0053]
　(3) processing unit 130
　processing unit 130 provides various functions of the digital device 100. Processing unit 130 includes a wireless communication processing unit 131, reception processing unit 133, generating unit 135 and the transmission processing unit 137. The processing unit 140 may further include other components other than these components. That is, the processing unit 140 may perform also the operation other than the operation of these components. Specific operations of the wireless communication processing unit 131, reception processing unit 133, generating unit 135 and the transmission processing unit 137 will be described in detail later.
[0054]
　For example, processor 130 communicates with wireless device 200 via the interface 110.
[0055]
　(4) implementation
　interface 110, transducers (e.g., O / E (Optical / Electrical) converter and / or E / O (Electrical / Optical) converter) may be implemented by like. The storage unit 120, a memory (e.g., nonvolatile memory and / or volatile memory) may be implemented by and / or a hard disk or the like. Processing unit 130, a baseband (Baseband: BB) may be implemented by a processor and / or other types of one or more processors such as a processor. Wireless communication processing unit 131, reception processing unit 133, generating unit 135 and the transmission processing unit 137 may be implemented by the same processor may be implemented by different processors separately. The memory (storage unit 120) may be included in the one or more processors, or may be outside the one or more processors.
[0056]
　Digital device 100 includes a program memory for storing (instruction), the program (instruction) may include one or more processors capable of executing. The one or more processors executes the program, the operation processing unit 130 (wireless communication processing unit 131, reception processing unit 133, the operation of the generator 135 and / or the transmission processing unit 137) may be performed . The program, the operation of the processing unit 130 (wireless communication processing unit 131, reception processing unit 133, the operation of the generator 135 and / or the transmission processing unit 137) may also be a program to be executed by the processor.
[0057]
　<3.3. Configuration of the wireless device>
　Next, with reference to FIG. 7, an example of a configuration of a wireless device 200 according to the first embodiment. Figure 7 is a block diagram showing an example of a schematic configuration of a wireless device 200 according to the first embodiment. Referring to FIG. 7, the wireless device 200 includes a first interface 210, second interface 220, a storage unit 230 and the processing unit 240.
[0058]
　(1) first interface 210
　first interface 210 is an interface for wireless communication via the plurality of antennas 300. The first interface 210 receives the radio signals from the plurality of antennas 300, and transmits a radio signal to the plurality of antennas 300.
[0059]
　(2) a second interface 220
　second interface 220 is an interface for communication with the digital device 100. In other words, the second interface 220 is an interface for the communication line 21 (e.g. an optical fiber line) connecting the digital device 100 and the wireless device 200. The second interface 220 receives signals from the digital device 100, transmits a signal to the digital device 100.
[0060]
　(3) storage unit 230
　storage unit 230, a program (instruction) and parameters for the operation of the wireless device 200, and various data are temporarily or permanently stored. The program includes one or more instructions for operation of the wireless device 200.
[0061]
　(4) processing unit 240
　processing unit 240 provides various functions of the wireless device 200. Processing unit 240 includes a wireless communication processing unit 241, transmission processor 243 and the reception processing unit 245. 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. Specific operations of the wireless communication processing unit 241, transmission processor 243 and the reception processing unit 245 will be described in detail later.
[0062]
　For example, processor 240 communicates with the digital device 100 via the second interface 220. The processing unit 240 (wireless communication processing unit 241) via a first interface 210 (the result via the plurality of antennas 300) to transmit and receive radio signals.
[0063]
　(5) Implementation Example
　The first interface 210, a high frequency (Radio Frequency: RF) may be implemented by circuitry and A / D converter or the like. The second interface 220, the transducer (e.g., O / E converter and / or the E / O converter) may be implemented by like. Storage unit 230, a memory (e.g., nonvolatile memory and / or volatile memory) may be implemented by and / or a hard disk or the like. Processor 240 may be implemented by one or more processors, such as BB processor and / or other type of processor. Wireless communication processing unit 241, transmission processor 243 and the reception processing unit 245 may be implemented by the same processor may be implemented by different processors separately. The memory (storage unit 230) may be included in the one or more processors, or may be outside the one or more processors.
[0064]
　Wireless device 200 includes a program memory for storing (instruction), the program (instruction) may include one or more processors capable of executing. The one or more processors executes the program, the operation processing unit 240 (wireless communication processing unit 241, the operation of the transmission processing unit 243 and / or the reception processing unit 245) may be performed. The program, the operation of the processing unit 130 (wireless communication processing unit 241, the operation of the transmission processing unit 243 and / or the reception processing unit 245) may be a program to be executed by the processor.
[0065]
　<3.4. Technical features>
　Next, with reference to FIGS. 8 to 14, for explaining the technical features of the first embodiment.
[0066]
　(1) wireless communication processing
　- reception processing
　wireless device 200 (first interface 210 and the wireless communication processing unit 241) receives the signal via a plurality of antennas 300. Furthermore, especially in the first embodiment, the wireless device 200 (wireless communication processing unit 241) multiplies the receive antenna weights to signals received via the plurality of antennas 300. The reception antenna weights, for example, can be called (receiving) beamforming weights (i.e., the weight for performing beamforming on the receiving side).
[0067]
　For example, the digital device 100 (wireless communication processing unit 131), the signal of one or more layers the wireless device 200 to the signal received via the plurality of antennas 300 is generated by multiplying the reception antenna weight It performs demodulation and decoding for.
[0068]
　Referring to FIG. 8, an example of a reception process of the digital device 100 and wireless device 200. Figure 8 is an explanatory diagram for explaining a schematic example of a wireless communication process of the first embodiment.
[0069]
　Wireless device 200 (transceiver unit 401), the radio reception signal of the plurality of antennas 300 (N-number of antennas 300) to (radio reception signal N sequence), into a reception baseband signals of N sequences on the time axis . Then, the wireless device 200 (FFT unit 403), FFT, the received baseband signals of the N channels on the time axis, and converts the received signal of the N channels on the frequency axis. Further, the wireless device 200 (antenna weight multiplying unit 405) the received signal of the N channels on the frequency axis, the receiving antenna weight matrix M rows and N columns (if the M 1 vector) multiplied with. As a result, the reception signal of the M-sequence (i.e., the received signal of M layer) is output, is transmitted to the digital device 100.
[0070]
　For example, as described above, signals transmitted from the wireless device 200 to the digital device 100 is not a received signal of N series, a reception signal of the M-sequence (received signal M layer). Therefore, even if the number of antennas N is large, the bandwidth of the interface can be suppressed between the digital device 100 and the wireless device 200.
[0071]
　Digital device 100 (demodulation unit 407 and the decoding unit 409) the received signal of the M-sequence (i.e., the received signal of M layer) demodulates and decodes. For example, the information after decoding is sent from the digital device 100 to another device, it is processed by the other device. Alternatively, information after decoding may be further processed by the digital device 100.
[0072]
　Incidentally, for example, transceiver unit 401 of FIG. 8 is included in the first interface 210 of FIG. 7, FFT unit 403 and the antenna weight multiplying unit 405 of FIG. 8 is included in the wireless communication processing unit 241 of FIG. Further, for example, the demodulator 407 and the decoder 409 of FIG. 8 is included in the wireless communication processing unit 131 of FIG. 6.
[0073]
　For example, as described above, the digital device 100 and wireless device 200 performs the reception processing of the physical layer (Physical Layer) (also referred to as Layer 1). That is, the wireless device 200 performs the reception processing part of the physical layer, the digital device 100 performs the rest of the reception processing of the physical layer.
[0074]
　- transmission process
　example, the digital device 100 (wireless communication processing unit 131) performs encoding and modulation to generate a signal of one or more layers.
[0075]
　For example, especially in the first embodiment, the wireless device 200 (wireless communication processing unit 241) multiplies a transmission antenna weights to the signal of said one or more layers. Further, the wireless device 200 (first interface 210 and the wireless communication processing unit 241) is a signal generated by multiplication of the transmitting antenna weight is transmitted via the plurality of antennas 300. The transmission antenna weights, for example, can be called (transmitted) beam forming weights (i.e., the weight for performing beamforming on the transmitting side).
[0076]
　Referring again to FIG. 8, the digital device 100 (encoding unit 421 and modulating section 423) encodes the transmission signal, modulated. As a result, transmission signals of L sequences (transmission signal of L layer) is output, it is transmitted to the wireless device 200.
[0077]
　Wireless device 200 (antenna weight multiplying unit 425) is a transmission signal of the L series, multiplied by the transmission antenna weight matrix with N rows and L columns, thereby generating a transmission signal of the N sequences on the frequency axis. Then, the wireless device 200 (IFFT unit 427), due IFFT, a transmission signal of said N channels on the frequency axis is converted into a baseband signal of N series on the time axis. Further, the wireless device 200 (transceiver unit 401), the baseband signal of the N channels on the time axis is converted into a radio transmission signal of N series. Then, the radio transmission signal of the N channels are transmitted from the plurality of antennas 300 (N-number of antennas 300).
[0078]
　For example, as described above, the signal transmitted from the digital device 100 to the wireless device 200 is not a received signal of N series, a reception signal of the L-series (L received signal layers). Therefore, even if the number of antennas N is large, the bandwidth of the interface can be suppressed between the digital device 100 and the wireless device 200.
[0079]
　Incidentally, for example, the encoding unit 421 and the modulation unit 423 of FIG. 8 is included in the wireless communication processing unit 131 of FIG. 6. For example, the antenna weight multiplying unit 425 and the IFFT unit 427 of FIG. 8 is included in the wireless communication processing unit 241 of FIG. 7, the transceiver 401 of FIG. 8 is included in the first interface 210 of FIG.
[0080]
　For example, as described above, the digital device 100 and wireless device 200 performs transmission processing of the physical layer (also referred to as Layer 1). That is, the wireless device 200 performs transmission processing portion of the physical layer, the digital device 100 performs the rest of the transmission processing of the physical layer.
[0081]
　(2) receiving antenna weight
　in especially the first embodiment, the wireless device 200 (transmission processing unit 243) transmits the channel related information about the channel of the signal received via the plurality of antennas 300 to the digital device 100 . Digital device 100 (reception processing unit 133) receives the channel related information from the wireless device 200.
[0082]
　For example, the digital device 100 (generator 135), based on the channel related information, to generate the weight information on the received antenna weight.
[0083]
　Additionally, the digital device 100 (transmission processing unit 137) transmits the weight information to the wireless device 200. Wireless device 200 (reception processing unit 245) receives the weight information from the digital device 100.
[0084]
　Thereafter, the wireless device 200 (wireless communication processing unit 241) multiplies the reception antenna weights to the signals received through the plurality of antennas 300.
[0085]
　(2-1) signal
　the signal received via the plurality of antennas 300, an uplink signal (i.e., signal transmitted from the terminal apparatus 40 to base station 10).
[0086]
　(2-2) channel related information
　- channels
　for example, the channel is the channel between the terminal device 40 and the plurality of antennas 300.
[0087]
　- First Example: the reference signal
　For example, the channel related information is a reference signal received via the plurality of antennas 300. That is, the wireless device 200 (transmission processing unit 243) transmits the reference signal to the digital device 100. The reference signal is information that is used for channel estimation of the channel.
[0088]
　In this case, the digital device 100 (generator 135) may perform channel estimation based on the reference signal, and calculates the channel estimation value. Then, the digital device 100 (generator 135), based on the channel estimation value to generate the weight information.
[0089]
　Referring to FIG. 9, illustrating a first example of a channel estimation and weighting information generating. Figure 9 is an explanatory diagram for explaining a first example of a channel estimation and weighting information generating of the first embodiment. Referring to FIG. 9, the wireless device 200 (transmission processing unit 243), the output of the FFT unit 403 (the reference signal N series) reference signals among (received signals of N channels on the frequency axis), the digital device 100 transmitted to, the digital device 100 (reception processing unit 133) receives the reference signal. Then, the digital device 100 (channel estimation unit 411: generation unit 135) calculates the channel estimation value (channel estimation value of the N sequence) by performing channel estimation based on the reference signal. Additionally, the digital device 100 (antenna weight generating unit 413: generation unit 135), based on the channel estimation value, and calculates the reception antenna weight (reception antenna weight matrix with M rows and N columns), weight for the reception antenna weight to generate the information. Digital device 100 (transmission processing unit 137) transmits the weight information to the wireless device 200, the wireless device 200 (reception processing unit 245) receives the weight information. Thereafter, the wireless device 200 (wireless communication processing unit 241), as a weight to be multiplied by the signals received via the plurality of antennas 300, sets the reception antenna weight. Thus, the wireless device 200 (wireless communication processing unit 241) will be multiplied by the reception antenna weights to signals received via the plurality of antennas 300.
[0090]
　According to this embodiment, not only the antenna weight generating section 413, channel estimation section 411 is also not included in the wireless device 200, included in the digital device 100. Therefore, the circuit scale of the radio device 200 may be smaller.
[0091]
　The reference signal is, for example, a reference signal transmitted in a particular time period within a time frame. Figure 10 is an explanatory diagram for explaining an example of a reference signal of the first embodiment. Referring to FIG. 10, the time frame 1001 to be repeated, there is shown a specific time period 1003 time frame 1001. For example, the reference signal 1011 is transmitted within a specific time period 1003. For example, the signal pattern of the reference signal 1011 is constant over the entire band, each user (each terminal) transmits a reference signal in a band allocated ones of the entire band. Thus, for example, from wireless device 200 to facilitate the transmission of the reference signal to the digital device 100. More specifically, for example, the wireless device 200, even without holding the information for each user (terminal), extracting only a reference signal from the received signal, transmits the reference signal to the digital device 100 can do. Incidentally, a specific time period 1003, for example, located at the end of the time frame 1001 as shown in FIG. 10, not limited to this example. For example, a specific time period 1003 may be initially positioned in the time frame 1001 may be located in other than the first and last time frame 1001. Also, a specific time period 1003 may be one continuous period, as shown in FIG. 10, or may be two or more distributed periods.
[0092]
　As an example, the time frame is a radio frame, the specific period is a specific symbol. That is, the reference signal is transmitted at a particular symbol in the radio frame. Incidentally, for example, one radio frame includes a predetermined number of subframes, one subframe includes a predetermined number of symbols. Note that the time frame and the particular time period is not limited to this example.
[0093]
　For example, the reference signal is a SRS (Sounding Reference Signal). Alternatively, the reference signal can be a DMRS (Demodulation Reference Signal).
[0094]
　The base station 10 (the digital device 100 and wireless device 200) may communicate with TDD (Time Division Duplex). In this case, for example, as shown in FIG. 11, the reference signal 1011 may be transmitted from the wireless device 200 to the digital device 100. Specifically, the wireless device 200 is in the reception period 1021 (i.e. uplink period), as radio reception signals, but receives a reference signal 1011 and other signal 1013 (data and control signals, etc.), the transmission period within 1023 (i.e. downlink period) does not receive a signal. Therefore, as shown in FIG. 11, the wireless device 200, for example, the other signal (signal of M-sequence) transmitted to the digital device 100 in the reception period 1021, the subsequent transmission period 1023 (and the reception period 1021 some) in the above reference signal (signal of N series) may be transmitted to the digital device 100.
[0095]
　- a second example: channel estimate
　the channel related information may be a channel estimation value calculated wireless device 200 by a channel estimation based on the reference signal received via the plurality of antennas 300. That is, the wireless device 200, based on the reference signal to calculate a channel estimation value by performing channel estimation, may transmit the channel estimation value to the digital device 100.
[0096]
　Referring to FIG. 12, illustrating a second example of a channel estimation and weighting information generating. Figure 12 is an explanatory diagram for explaining a second example of a channel estimation and weighting information generating of the first embodiment. Referring to FIG. 12, the radio device 200 (channel estimation unit 411: radio communication unit 241), the reference signal of the reference signal (N sequence of the outputs of the FFT unit 403 (reception signal of N sequences on the frequency axis) by performing channel estimation based on), and calculates the channel estimation value (channel estimation value of N series). The wireless device 200 (transmission processing unit 243) sends the channel estimation value to the digital device 100, the digital device 100 (reception processing unit 133) receives the channel estimates. Additionally, the digital device 100 (antenna weight generating unit 413: generation unit 135), based on the channel estimation value, and calculates the reception antenna weight (reception antenna weight matrix with M rows and N columns), weight for the reception antenna weight to generate the information. Since the subsequent processing is the same as the example of FIG. 9, the description thereof is omitted here here.
[0097]
　According to this example, be transmitted from the wireless device 200 to the digital device 100 is a channel estimate rather than the reference signal itself. For example, the data amount of the channel estimate may be compressed by the averaging or the like of the channel estimation value on the frequency axis. Therefore, the bandwidth of the interface can be further suppressed between the wireless device 200 and the digital device 100.
[0098]
　(2-3) weight information
　as described above, the weight information is a weight information on the reception antenna weight. For example, the weight information is information indicating the reception antenna weight.
[0099]
　Further, as described above, the reception antenna weight is the weight of the wireless device 200 to the signal received via the plurality of antennas 300 are multiplied. For example, the reception antenna weight is the weight of the wireless device 200 to a signal from the terminal device 40 received via the plurality of antennas are multiplied.
[0100]
　For example, as described above, the receiving antenna weights, receive antenna weight matrix M rows and N columns (in the case of M 1 vector) is. In this case, the weight information is information indicating the reception antenna weight matrix of the M rows and N columns.
[0101]
　As a first example, the weight information includes information indicating the individual weights included in the received antenna weight. Specifically, for example, the reception antenna weight is the received antenna weight matrix with M rows and N columns, the weight information includes information indicating the individual elements included in the receiving antenna weight matrix (weighting). That is, the weight information includes information indicating each element of the M × N. Thus, for example, it is possible to set the reception antenna weight more flexibly.
[0102]
　As a second example, the reception antenna weight may be one receiving antenna weight sets included in the plurality of reception antenna weights predetermined set, the weight information may the one receive antenna weight set it may be an index showing. Specifically, for example, a plurality of receiving antenna weight set index indicating each of the plurality of receiving antenna weight set may be predefined as a codebook, the weight information is 1 in the codebook One of the receiving antenna weight set may be an index indicating the. Thus, for example, information amount of weight information becomes smaller.
[0103]
　(2-4) Information on the use of the receiving antenna weights
　for example, digital device 100 (transmission processing unit 137) includes a said weight information, information about the use of the reception antenna weight (hereinafter, referred to as "usage information") and , to the radio device 200. Thus, for example, wireless device 200 is enabled to actually perform the multiplication of the reception antenna weight.
[0104]
　- frequency information
　for example, the usage information includes frequency information related to the frequency of the receiving antenna weights are used. For example, the frequency of the reception antenna weight is used, a frequency assigned to the terminal device 40. That is, the frequency information is information related to the frequency assigned to the terminal device 40.
[0105]
　For example, the frequency information indicates multiple of the frequency blocks, a frequency block in which the receiving antenna weights are used. In other words, the frequency information indicating the frequency block signal to be multiplied by the plurality of antenna weight is transmitted. The frequency information may indicate may indicate one frequency block, or a plurality of frequency blocks. For example, the frequency block is a resource block (or resource block group).
[0106]
　Additionally / alternatively, the frequency information may indicate the frequency resolution of the reception antenna weight. In other words, the frequency information may indicate the width (unit width) of the frequency of the receiving antenna weights are used.
[0107]
　Such frequency information, for example, the wireless device 200, it is possible to know the reception antenna weights to the signal transmitted at any frequency may be multiplied.
[0108]
　- time information
　for example, the usage information includes time information about the time at which the receiving antenna weights are used. For example, the time that the receiving antenna weights are used, the time allocated to the terminal apparatus 40. That is, the time information is information about the time allocated to the terminal apparatus 40.
[0109]
　For example, the time information indicates a period during which the receiving antenna weights are used. In other words, the time information indicates a period during which the signal to be multiplied by the plurality of antenna weight is transmitted. The period may be sub-frame, or it may be a slot. However, not the period is limited to these examples.
[0110]
　Such time information, for example, the wireless device 200, it becomes possible to know when the transmission is the receive antenna weights to signals may be multiplied.
[0111]
　The frequency information and the time information may be radio resource information concerning radio resources which the receiving antenna weights are used (may also be referred to as resource allocation information or the scheduling information).
[0112]
　As described above, the wireless device 200 transmits the channel related information to the digital device 100, the digital device 100, based on the channel related information to generate the weighting information about the reception antenna weight, the weight information to the wireless device 200. Then, the wireless device 200 multiplies the reception antenna weights to the signals received through the plurality of antennas 300. Thus, generation of the weight information (calculation of the reception antenna weight), since is performed by the digital device 100 rather than the wireless device 200, the circuit scale of the radio device 200 may be suppressed.
[0113]
　(3) Processing Flow
　- wireless communication processing
　with reference to Figure 13, an example of wireless communication processing according to the first embodiment. Figure 13 is a sequence diagram for explaining an example of a schematic flow of radio communication processing according to the first embodiment.
[0114]
　Wireless device 200 receives the signal via a plurality of antennas 300 (S501).
[0115]
　Wireless device 200 multiplies the receive antenna weights to signals received via the plurality of antennas 300 (S503). Thus, for example, signals of one or more layers are produced.
[0116]
　Wireless device 200 transmits a signal of the one or more layers to the digital device 100 (S505).
[0117]
　Digital device 100 performs demodulation and decoding for signals of the one or more layers (S507).
[0118]
　- reception of the channel related information and weight information
　with reference to Figure 14, an example of a process of transmitting and receiving channel related information and weight information according to the first embodiment. Figure 14 is a sequence diagram for explaining an example of a schematic flow of processing of the transmit and receive channel related information and weight information according to the first embodiment.
[0119]
　Wireless device 200 receives the signal via a plurality of antennas 300 (S521).
[0120]
　Wireless device 200, the channel related information about the channel of the signal received via the plurality of antennas 300 and sent to the digital device 100, the digital device 100 receives the channel related information (S523).
[0121]
　Digital device 100, based on the channel related information and generates weight information relating to the reception antenna weight (S525).
[0122]
　Digital device 100 transmits the weight information to the wireless device 200, wireless device 200 receives the weight information (S527).
[0123]
　Wireless device 200, as a weight to be multiplied by the signals received via the plurality of antennas 300, setting the receive antenna weights (S529).
[0124]
　<3.5. Modification>
　As described above, in the first embodiment, the digital device 100 (transmission processing unit 137) is
the weight information on the reception antenna weights wireless device 200 multiplies the signal received via the plurality of antennas 300 and it transmits to the wireless device 200. Wireless device 200 (reception processing unit 245) receives the weight information from the digital device 100.
[0125]
　- The first example
　in the modification of the first embodiment, for example, digital device 100 (transmission processing unit 137), the wireless device 200 for generation of a signal to be transmitted via the plurality of antennas 300 is used other weight information relating to transmit antenna weights may also be transmitted to the wireless device 200. Then, the wireless device 200 (reception processing unit 245) may receive the other weight information from the digital device 100. For example, the digital device 100 (generator 135), based on the channel related information, may generate the other information.
[0126]
　The transmission antenna weights, N rows and L columns of the transmit antenna weight matrix (when L 1 is a vector) may be.
[0127]
　It said another weight information relating to the transmitting antenna weights, may be information of the same type as the weight information on the reception antenna weight.
[0128]
　Wireless device 200 (wireless communication processing unit 241), based on the other weights information may set the transmission antenna weight. The wireless device 200 (wireless communication processing unit 241), by multiplying the transmission antenna weights to one or more layers of the signal (e.g., signal L layer), a signal to be transmitted via the plurality of antennas 300 it may be generated.
[0129]
　- a second example
　or the reception antenna weight may be antenna weights used wireless device 200 is also for generating the signal to be transmitted via the plurality of antennas. That is, a reception antenna weight and transmission antenna weights may be the same. For example, if the received number of layers M and transmitting the number of layers L are identical, thus the receive antenna weights and transmit antenna weights may be the same.
[0130]
　Regardless of whether the first embodiment or the second embodiment, especially in the first modification, the base station 10 (the digital device 100 and wireless device 200) may communicate with TDD.
[0131]
　It has been described a first embodiment. According to the first embodiment, the circuit scale of the radio device 200, both the band of the interface between the wireless device 200 and the digital device 100 may be suppressed.
[0132]
　<< 4. >> The second embodiment
　is followed with reference to FIGS. 15 to 17, illustrating a second embodiment of the present invention. First embodiment described above is a specific embodiment, the second embodiment is more generalized embodiment.
[0133]
　＜４．１．システムの構成＞
　まず、図１５を参照して、第２の実施形態に係るシステム２の構成の例を説明する。図１５は、第２の実施形態に係るシステム２の概略的な構成の一例を示す説明図である。図１５を参照すると、システム２は、第１の通信装置６００、第２の通信装置７００及び複数のアンテナ８００を含む。
[0134]
　例えば、システム２は、基地局である。当該基地局についての説明は、例えば、第１の実施形態の基地局１０についての説明と同じである。よって、ここでは重複する説明を省略する。
[0135]
　－第１の通信装置６００及び第２の通信装置７００
　例えば、第１の通信装置６００及び第２の通信装置７００の各々は、基地局を構成する複数の装置のうちの１つである。システム２（基地局）は、第１の通信装置６００及び第２の通信装置７００（並びに複数のアンテナ８００）以外の他の装置（図示せず）をさらに含んでもよい。
[0136]
　第２の通信装置７００は、第１の通信装置６００とは物理的に分離された装置である。例えば、第２の通信装置７００は、複数のアンテナ８００に接続され、第１の通信装置６００は、第２の通信装置７００に接続される。例えば、第１の通信装置６００と第２の通信装置７００とは、通信回線２３により互いに接続される。第１の通信装置６００は、通信回線２３を介して第２の通信装置７００から情報を受信し、通信回線２３を介して第２の通信装置７００へ情報を送信する。例えば、通信回線２３は、光ファイバ回線（光ファイバケーブル）である。また、例えば、第１の通信装置６００は屋内に設置され、第２の通信装置７００は屋外に設置される。
[0137]
　上記基地局（システム２）が上記第１のユニット及び上記第２のユニット（第１の実施形態を参照）を含む場合に、第１の通信装置６００は上記第１のユニット（例えば、ＤＵ（Digital　Unit）又はＢＢＵ）であってもよく、第２の通信装置７００は上記第２のユニット（例えば、ＲＵ（Remote/Radio　Unit）、ＲＲＨ又はＲＲＵ）であってもよい。あるいは、第１の通信装置６００及び第２の通信装置７００は、上記第２のユニット（例えばＤＵ（Distributed　Unit））に含まれる装置であってもよい。
[0138]
　－－複数のアンテナ８００
　例えば、上記複数のアンテナ８００の各々は、多素子アンテナに含まれるアンテナ素子である。例えば、当該多素子アンテナは、マッシブＭＩＭＯ用のアンテナである。
[0139]
　以上、システム２の構成を説明した。一例として、第１の通信装置６００は、第１の実施形態のデジタル装置１００であってもよく、第２の通信装置７００は、第１の実施形態の無線装置２００であってもよく、上記複数のアンテナ８００は、第１の実施形態の複数のアンテナ３００であってもよい。当然ながら、第２の実施形態はこの例に限定されない。一例として、第１の通信装置６００は、第１の実施形態のデジタル装置１００に含まれる装置（部品／モジュール）であってもよく、第２の通信装置７００は、第１の実施形態の無線装置２００に含まれる装置（部品／モジュール）であってもよい。別の例として、第２の通信装置７００は、無線装置であるが、第１の通信装置６００は、デジタル装置とは別の第３の装置であってもよい。
[0140]
　＜４．２．第１の通信装置の構成＞
　次に、図１６を参照して、第２の実施形態に係る第１の通信装置６００の構成の例を説明する。図１６は、第２の実施形態に係る第１の通信装置６００の概略的な構成の例を示すブロック図である。図１６を参照すると、第１の通信装置６００は、受信処理部６１０及び送信処理部６２０を備える。
[0141]
　受信処理部６１０及び送信処理部６２０の具体的な動作は、後に説明する。
[0142]
　受信処理部６１０及び送信処理部６２０は、１つ以上のプロセッサ（ＢＢプロセッサ及び／又は他の種類のプロセッサ等）及びメモリにより実装されてもよい。
[0143]
　第１の通信装置６００は、プログラム（命令）を記憶するメモリと、当該プログラム（命令）を実行可能な１つ以上のプロセッサとを含んでもよい。当該１つ以上のプロセッサは、上記プログラムを実行して、受信処理部６１０及び送信処理部６２０の動作を行ってもよい。上記プログラムは、受信処理部６１０及び送信処理部６２０の動作をプロセッサに実行させるためのプログラムであってもよい。
[0144]
　なお、当然ながら、第１の通信装置６００は、受信処理部６１０及び送信処理部６２０以外の構成要素をさらに備えてもよい。例えば、第１の通信装置６００は、第１の実施形態のデジタル装置１００が備える構成要素（例えば、インタフェース１１０、記憶部１２０、無線通信処理部１３１及び／又は生成部１３５）をさらに備えてもよい。
[0145]
　<4.3. Configuration of the second communication device>
　Next, with reference to FIG. 17, an example of the configuration of the second communication apparatus 700 according to the second embodiment. Figure 17 is a block diagram showing an example of a schematic configuration of a second communication device 700 according to the second embodiment. Referring to FIG. 17, the second communication device 700 includes a wireless communication processing unit 710, transmission processing unit 720 and the reception processing unit 730.
[0146]
　Specific operations of the wireless communication processing unit 710, transmission processing unit 720 and the reception processing unit 730 will be described later.
[0147]
　Wireless communication processing unit 710, transmission processing unit 720 and the reception processing unit 730 may be implemented by one or more processors (BB processor and / or other types of processors, etc.) and memory.
[0148]
　The second communication device 700, a program memory for storing (instruction), the program (instruction) may include one or more processors capable of executing. The one or more processors executes the program, the wireless communication processing unit 710 may perform the operation of the transmission processing unit 720 and the reception processing unit 730. The program, the wireless communication processing unit 710, the operation of the transmission processing unit 720 and the reception processing unit 730 may be a program to be executed by the processor.
[0149]
　Naturally, the second communication device 700, the wireless communication processing unit 710 may further comprise components other than the transmission processing unit 720 and the reception processing unit 730. For example, the second communication device 700, the components which the wireless device 200 of the first embodiment comprises (e.g., a first interface 210, second interface 220 and / or storage unit 230) may further comprise a.
[0150]
　<4.4. Technical features>
　Next, the technical features of the second embodiment.
[0151]
　(1) wireless communication processing
　the second communication apparatus 700 (wireless communication processing unit 710) receives the signal via a plurality of antennas 800. Furthermore, especially in the second embodiment, the second communication apparatus 700 (wireless communication processing unit 710) multiplies the receive antenna weights to signals received via the plurality of antennas 800.
[0152]
　Description of such a radio communication processing (reception processing), for example, are as described for the wireless communication process of the first embodiment (receiving process). Further, also the description of the transmission process may be the same as the description of the transmission process of the first embodiment. In this case, the second communication apparatus 700 (wireless communication processing unit 710) may operate similarly to the wireless device 200 of the first embodiment (wireless communication processing unit 241). The first communication device 600 may operate similarly to the first embodiment of the digital device 100 (wireless communication processing unit 131). Accordingly, overlapping description is omitted here.
[0153]
　Needless to say, the second embodiment is not limited to the example described above. As an example, not the first communication apparatus 600 other devices (digital device) may perform the wireless communication processing.
[0154]
　(2) receiving antenna weight
　In a particularly second embodiment, the second communication apparatus 700 (the transmission processing unit 720), the channel related information about the channel of the signal received via the plurality of antennas 800 first and it transmits to the communication device 600. The first communication device 600 (reception processing unit 610) receives the channel related information from the second communication device 700.
[0155]
　Based on the channel related information, weight information relating to the receiving antenna weights are generated.
[0156]
　Further, the first communication device 600 (transmission processing unit 620) transmits the weight information to the second communication device 700. The second communication device 700 (reception processing unit 730) receives the weight information from the first communication device 600.
[0157]
　Thereafter, the second communication apparatus 700 (wireless communication processing unit 710) multiplies the reception antenna weights to the signals received through the plurality of antennas 800.
[0158]
　Description of such a receiving antenna weights, for example, is as described for the receiving antenna weights of the first embodiment. In this case, the second communication apparatus 700 (wireless communication processing unit 710, transmission processing unit 720 and the reception processing unit 730), the first embodiment of a wireless device 200 (wireless communication processing unit 241, transmission processor 243 and reception processing unit 245) and may operate similarly. The first communication device 600 (reception processing unit 610 and the transmission processing unit 620) may operate similarly to the first embodiment of the digital device 100 (reception processing unit 133 and the transmission processing unit 137). Accordingly, overlapping description is omitted here.
[0159]
　Needless to say, the second embodiment is not limited to the example described above. As an example, not the first communication apparatus 600 other devices may generate the weighting information based on the channel related information.
[0160]
　(3) Flow of process
　as an example, processing of the second embodiment is the same as the process in the first embodiment. Accordingly, overlapping description is omitted here. Needless to say, the second embodiment is not limited to this example.
[0161]
　It has been described a second embodiment. According to the second embodiment, both the band of the interface between the circuit scale of the second communication device 700, the second communication device 700 and another communication device (for example, the first communication device 600) but, it can be suppressed. The first modification of the first embodiment may be applied also to the second embodiment.
[0162]
　Having described the embodiments of the present invention, the present invention is not limited to these embodiments. That these embodiments are exemplary only, and that various modifications are possible without departing from the scope and spirit of the present invention it will be understood by those skilled in the art.
[0163]
　For example, steps in the process described herein may not be performed in chronologically according to the order described in the sequence diagram. For example, steps in the process, be performed in an order different from the order described as a sequence diagram, or may be executed in parallel. Also, may be removed some steps in the process, it may be added a further step in the process.
[0164]
　The communication device described in this specification process comprising (digital device, a wireless device, the first or the second telecommunication device) operation / processing may be to provide, the operation / processing processor program for executing may be provided. Further, non-transitory computer-readable recording medium recording the program (Non-transitory computer readable medium) may be provided. Of course, such a method, a program, and non-transitory computer-readable recording medium is also included in the present invention.
[0165]
　Some or all of the above embodiments, can be described as the following notes, not limited to the following.
[0166]
(Supplementary Note 1)
　A first communication device,
　from a second communication device that receives a signal via a plurality of antennas, receives the channel related information about the channel of the signal received via the plurality of antennas a reception processing unit,
　a weight information relating to the reception antenna weights of the plurality of antennas and the second communication apparatus to the signal received via the multiplies, the weight information generated based on said channel related information a transmission processing unit for transmitting to the second communication device,
the first communication device comprising a.
[0167]
(Supplementary Note 2)
　The weight information is information indicating the reception antenna weight, the first communication device according to note 1.
[0168]
(Supplementary Note 3)
　the weight information includes information indicating the individual weights are included in the reception antenna weight, the first communication apparatus according to note 2.
[0169]
(Supplementary Note 4)
　The reception antenna weight is one reception antenna weight sets included in the plurality of reception antenna weights predetermined set,
　the weight information is an index indicating the one receive antenna weight sets,
the first communication apparatus according to note 2.
[0170]
(Supplementary Note 5)
　The transmission processing section, said weight information, and information about the use of the receiving antenna weights, and transmits to the second communication device, the first according to any one of Appendices 1 to 4 communication device.
[0171]
(Supplementary Note 6)
　The information regarding the use of the receiving antenna weights comprises the frequency information related to the frequency of the receiving antenna weights are used, the first communication apparatus according to note 5.
[0172]
(Supplementary Note 7)
　The frequency information of the plurality of frequency blocks, indicating the frequency block receiving antenna weights are used, the first communication apparatus according to note 6.
[0173]
(Supplementary Note 8)
　The frequency information indicates a frequency resolution of the receiving antenna weights, the first communication apparatus according to note 6 or 7.
[0174]
(Supplementary Note 9)
　The channel is a channel between the terminal device and the plurality of antennas,
　the reception antenna weight, the second on a signal from the terminal device is received via the plurality of antennas a weight communication device multiplies,
　the frequency information is information on frequency allocated to the terminal device,
the first communication apparatus according to any one of appendices 6-8.
[0175]
(Supplementary Note 10)
　The information regarding the use of the receiving antenna weights, including the time information on the time reception antenna weights are used, the first communication apparatus according to note 5.
[0176]
(Supplementary Note 11)
　The channel is a channel between the terminal device and the plurality of antennas,
　the reception antenna weight, the second on a signal from the terminal device is received via the plurality of antennas a weight communication device multiplies,
　the time information is information about the time allocated to the terminal device,
the first communication apparatus according to note 10.
[0177]
(Supplementary Note 12)
　said channel related information is a reference signal received via the plurality of antennas, the first communication apparatus according to any one of Appendices 1 to 11.
[0178]
(Supplementary Note 13)
　said channel related information, wherein a plurality of channel estimates wherein the channel estimation based on the reference signal the second communication apparatus calculates received through the antenna, one of Appendices 1 to 12 1 the first communication device according to claim.
[0179]
(Supplementary Note 14)
　The reference signal is a reference signal transmitted in a particular time period within a time frame, the first communication apparatus according to note 12 or 13.
[0180]
(Supplementary Note 15)
　The time frame is a radio frame,
　the specific period is a specific symbol,
the first communication apparatus according to note 14.
[0181]
(Supplementary Note 16)
　The reference signal is a SRS (Sounding Reference Signal) or DMRS (stands for demodulation Reference Signal), the first communication apparatus according to any one of Appendices 12-15.
[0182]
(Supplementary Note 17)
　said channel related information further comprises a generator configured to generate the weighting information based on the first communication device according to any one of Appendices 1 to 16.
[0183]
(Supplementary Note 18)
　radio the plurality of antennas and the second communication apparatus on a signal received via a performs demodulation and decoding of the signal of one or more layers produced by multiplying the reception antenna weight further comprising a communication processing unit, the first communication apparatus according to any one of appendices 1 to 17.
[0184]
(Supplementary Note 19)
　The transmission processing section is a another weight information relating to transmit antenna weights said second communication device is used for the generation of a signal to be transmitted via the plurality of antennas, the channel related information the other weight information generated based on a transmission to the second communication device, the first communication apparatus according to any one of appendices 1 to 18.
[0185]
(Supplementary Note 20)
　the receiving antenna weights are antenna weights the second communication device is also used for the generation of a signal to be transmitted via the plurality of antennas, to any one of Appendices 1 to 18 the first communication device according.
[0186]
(Supplementary Note 21)
　the second communication device is a device for communicating with TDD (Time Division Duplex), the first communication apparatus according to note 19 or 20.
[0187]
(Supplementary Note 22)
　The signal is an uplink signal, the first communication apparatus according to any one of Appendices 1 to 21.
[0188]
(Supplementary Note 23)
　each of said first communication device and the second communication device is one of a plurality of devices constituting the base station, according to any one of Appendices 1 to 22 second 1 of the communication device.
[0189]
(Supplementary Note 24)
　is the channel, the channel between the terminal device and the plurality of antennas,
　the reception antenna weight, the second on a signal from the terminal device is received via the plurality of antennas a weight communication device multiplies,
the first communication apparatus according to any one of appendices 1 to 23.
[0190]
(Supplementary Note 25)
　each of the plurality of antennas is an antenna element included in the multi-element antenna, the first communication apparatus according to any one of Appendices 1 to 24.
[0191]
(Supplementary Note 26)
　the multi-element antenna is an antenna for Massive MIMO (Massive Multiple-Input and Multiple -Output), the first communication apparatus according to note 25.
[0192]
(Supplementary Note 27)
　The transmission processing unit via the communication line to receive the channel-related information from the second communication device,
　wherein the reception processing unit, said via said communication line to said second communication device transmitting the weight information,
the first communication apparatus according to any one of appendices 1 to 26.
[0193]
(Supplementary Note 28)
　the communication line is an optical fiber line, the first communication apparatus according to note 27.
[0194]
(Supplementary Note 29)
　the second communication device, wherein the first communication device is physically separate device, the first communication apparatus according to any one of Appendices 1 to 28.
[0195]
(Supplementary Note 30)
　the second communication device is a device connected to the plurality of antennas,
　the first communication device is a device connected to the second communication device,
Appendix 1-29 the first communication device according to any one of.
[0196]
(Supplementary Note 31)
　the first communication device is a device that is installed indoors,
　the second communication device is a device that is installed outdoors,
according to any one of Appendices 1 to 30 first communication device.
[0197]
(Supplementary Note 32)
　and a second communication apparatus,
　a wireless communication processing unit for receiving signals through a plurality of antennas,
　the channel related information about the channel of the signal received via the plurality of antennas the first a transmission processing unit for transmitting to the communication device,
　a weight information related to the reception antenna weight, the weight information generated based on said channel related information, a reception processing unit for receiving from the first communication device,
the provided,
　the wireless communication processing unit, the multiplying receive antenna weights to signals received via the plurality of antennas,
the second communication device.
[0198]
(Supplementary Note 33)
　from a communication device that receives a signal via multiple antennas, receiving a channel-related information on the channel of the signal received via the plurality of antennas,
　are received via the plurality of antennas receiving a weight information on antenna weights, the weight information generated based on said channel related information, and transmitting to the communication device for the multiplication communication device in that the signal
process including.
[0199]
(Supplementary Note 34)
　receiving a signal via a plurality of antennas,
　and transmitting the channel-related information on the channel of the signal received via the plurality of antennas to the communication device,
　the weight information on the reception antenna weight there, the weight information generated based on said channel related information, receiving from the communication device,
　and multiplying the reception antenna weights to the signals received through the plurality of antennas,
the the method comprising.
[0200]
(Supplementary Note 35)
　from a communication device that receives a signal via multiple antennas, receiving a channel-related information on the channel of the signal received via the plurality of antennas,
　are received via the plurality of antennas a weight information relating to the reception antenna weight by the communication device to multiply the that signal, the weight information generated based on said channel related information, and transmitting to the communication device,
a program for executing the processor.
[0201]
(Supplementary Note 36)
　receiving a signal via a plurality of antennas,
　and transmitting the channel-related information on the channel of the signal received via the plurality of antennas to the communication device,
　the weight information on the reception antenna weight there, the weight information generated based on said channel related information, receiving from the communication device,
　and multiplying the reception antenna weights to the signals received through the plurality of antennas,
the program to be executed by the processor.
[0202]
(Supplementary Note 37)
　from a communication device that receives a signal via multiple antennas, receiving a channel-related information on the channel of the signal received via the plurality of antennas,
　are received via the plurality of antennas a weight information relating to the reception antenna weights to the multiplication communication device to that signal, the weight information generated based on said channel related information, and transmitting to the communication device,
a program to be executed by the processor non-transitory recording medium readable recording computer.
[0203]
(Supplementary Note 38)
　receiving a signal via a plurality of antennas,
　and transmitting the channel-related information on the channel of the signal received via the plurality of antennas to the communication device,
　the weight information on the reception antenna weight there, the weight information generated based on said channel related information, receiving from the communication device,
　and multiplying the reception antenna weights to the signals received through the plurality of antennas,
the non-transitory recording medium readable program to be executed by the processor in the recording computer.
[0204]
(Supplementary Note 39)
　and the first communication device,
　a second communication device,
wherein the
　second communication device
　　receives the signal via multiple antennas,
　　are received via the plurality of antennas sending channel related information about the channel signal to the first communication device,
　the first communication device
　　receives the channel related information from the second communication device,
　　a weight information relating to the received antenna weight , the weight information generated based on said channel related information, transmitted to the second communication device,
　said second communication device
　　receives the weight information from the first communication device,
　　said plurality wherein multiplying the reception antenna weights to the signal received through the antenna,
systems.
[0205]
(Supplementary Note 40)
　In the second communication device,
　　receiving a signal via a plurality of antennas,
　　transmits the channel related information about the channel of the signal received via the plurality of antennas to the first communication device it and,
　in the first communication device,
　　comprising: receiving the channel-related information from the second communication device,
　　a weight information related to the reception antenna weight, the weight is generated based on the channel related information information, the and transmitting to the second communication device,
　the first in the second communication device,
　　comprising: receiving said weight information from said first communication device,
　　signals received through the plurality of antennas and multiplying said reception antenna weights to the
method comprising.
[0206]
　This application claims priority based on Japanese Patent Application No. 2017-055726 filed on March 22, 2017, the entire disclosure of which is incorporated herein.
Industrial Applicability
[0207]
　In mobile communication systems, it is possible to suppress both the bandwidth of the circuit scale and the inter-device interface unit for receiving a signal through an antenna.
DESCRIPTION OF SYMBOLS
[0208]
　1,2 system
　10 a base station
　21, 23 communication line
　40 terminal device
　100 digital device
　131 the wireless communication processing unit
　133,610 the reception processing unit
　135 generates unit
　137,620 transmission processing unit
　200 wireless device
　241,710 wireless communication processing unit
　243, 720 transmission processing unit
　245,730 the reception processing section
　300, 800 antenna
　411 channel estimation unit
　413 antenna weight generating unit
　600 first communication device
　700 the second communication device
　1001 time frame
　1003 certain period
　1011 reference signal

The scope of the claims
[Requested item 1]　A first communication device,
　from a second communication device that receives a signal via a plurality of antennas, and a reception processing unit for receiving channel-related information on the channel of the signal received via the plurality of antennas ,
　a weight information relating to the reception antenna weights said second communication device multiplies the signal received through the plurality of antennas, the weight information generated based on said channel related information, the second a transmission processing unit for transmitting to the communication device,
the first communication device comprising a.
[Requested item 2]
　The weight information is information indicating the reception antenna weight, the first communication apparatus according to claim 1.
[Requested item 3]
　The weight information includes information indicating the individual weights are included in the reception antenna weight, the first communication apparatus according to claim 2.
[Requested item 4]
　The reception antenna weight is one reception antenna weight sets included in the plurality of reception antenna weights predetermined set,
　the weight information is an index indicating the one receive antenna weight set,
to claim 2 the first communication device according.
[Requested item 5]
　The transmission processing unit, said weight information, and information about the use of the receiving antenna weights, and transmits to the second communication device, the first communication device according to any one of claims 1 to 4, .
[Requested item 6]
　It said information on the use of the receiving antenna weights comprises the frequency information related to the frequency of the receiving antenna weights are used, the first communication apparatus according to claim 5.
[Requested item 7]
　The frequency information, among the plurality of frequency blocks, indicating the frequency block receiving antenna weights are used, the first communication apparatus according to claim 6.
[Requested item 8]
　It said frequency information indicates a frequency resolution of the receiving antenna weights, the first communication apparatus according to claim 6 or 7.
[Requested item 9]
　The channel is a channel between the terminal device and the plurality of antennas,
　the reception antenna weight, the second communication device multiplies the signal from the terminal device is received via the plurality of antennas a weight that,
　the frequency information is information on frequency allocated to the terminal device,
the first communication device according to any one of claims 6-8.
[Requested item 10]
　It said information on the use of the receiving antenna weights, including time information about the time during which the receiving antenna weights are used, the first communication apparatus according to claim 5.
[Requested item 11]
　The channel is a channel between the terminal device and the plurality of antennas,
　the reception antenna weight, the second communication device multiplies the signal from the terminal device is received via the plurality of antennas a weight that,
　the time information, the is information about the time allocated to the terminal device,
the first communication apparatus according to claim 10.
[Requested item 12]
　It said channel related information is a reference signal received via the plurality of antennas, the first communication device according to any one of claims 1 to 11.
[Requested item 13]
　Said channel related information, wherein a plurality of channel estimates wherein the channel estimation based on the reference signal the second communication apparatus calculates received through the antenna, according to any one of claims 1 to 12 the first communication device.
[Requested item 14]
　The reference signal is a reference signal transmitted in a particular time period within a time frame, the first communication apparatus according to claim 12 or 13.
[Requested item 15]
　The time frame is a radio frame,
　the specific period is a specific symbol,
the first communications device of claim 14.
[Requested item 16]
　The reference signal is a SRS (Sounding Reference Signal) or DMRS (Demodulation Reference Signal), the first communication device according to any one of claims 12-15.
[Requested item 17]
　Further comprising a generator configured to generate the weighting information based on said channel related information, the first communication device according to any one of claims 1 to 16.
[Requested item 18]
　The wireless communication processing unit that performs demodulation and decoding of the signal of one or more layers produced by said plurality of antennas and the second communication apparatus on a signal received via a multiplies the reception antenna weight further comprising, a first communication device according to any one of claims 1 to 17.
[Requested item 19]
　The transmission processing section is a said another weight information relating to transmit antenna weights the second communication device is used for the generation of a signal to be transmitted via the plurality of antennas, generated based on the channel related information the other weights information, and transmits to the second communication device, the first communication device according to any one of claims 1 to 18.
[Requested item 20]
　The receiving antenna weights, the a plurality of antenna weights said second communication device is also used for the generation of a signal transmitted through the antenna, first according to any one of claims 1 to 18 1 of the communication device.
[Requested item 21]
　The second communication device is a device for communicating with TDD (Time Division Duplex), the first communication apparatus according to claim 19 or 20.
[Requested item 22]
　The signal is an uplink signal, the first communication device according to any one of claims 1 to 21.
[Requested item 23]
　Each of the first communication device and the second communication device is one of a plurality of devices constituting the base station, the first communication according to any one of claims 1 to 22 apparatus.
[Requested item 24]
　The channel is a channel between the terminal device and the plurality of antennas,
　the reception antenna weight, the second communication device multiplies the signal from the terminal device is received via the plurality of antennas it is a weight that,
the first telecommunication device according to any one of claims 1 to 23.
[Requested item 25]
　Each of the plurality of antennas is an antenna element included in the multi-element antenna, the first communication device according to any one of claims 1 to 24.
[Requested item 26]
　The multi-element antenna is an antenna for Massive MIMO (Massive Multiple-Input and Multiple-Output), the first communication apparatus according to claim 25.
[Requested item 27]
　The transmission processing unit via the communication line to receive the channel-related information from the second communication device,
　wherein the reception processing unit, transmits the weight information via said communication line to said second communication device to,
the first communication device according to any one of claims 1 to 26.
[Requested item 28]
　The communication line is an optical fiber line, the first communication apparatus according to claim 27.
[Requested item 29]
　The second communication device, wherein the first communication device is physically separate device, the first communication device according to any one of claims 1 to 28.
[Requested item 30]
　The second communication device is a device connected to the plurality of antennas,
　the first communication device is a device connected to the second communication device,
any of claims 1-29 the first communication apparatus according to item 1.
[Requested item 31]
　The first communication device is a device that is installed indoors,
　the second communication device is a device that is installed outdoors,
the first according to any one of claims 1 to 30 Communication device.
[Requested item 32]
　A second communication device,
　a wireless communication processing unit for receiving signals through a plurality of antennas,
　transmits the channel related information about the channel of the signal received via the plurality of antennas to the first communication device a transmission processing unit that,
　a weight information related to the reception antenna weight, the weight information generated based on said channel related information, and a reception processing unit for receiving from the first communication device
comprises a,
　the radio communication processing unit, the multiplying receive antenna weights to signals received via the plurality of antennas,
the second communication device.
[Requested item 33]
　From the communication device that receives a signal via multiple antennas, receiving a channel-related information on the channel of the signal received via the plurality of antennas,
　the on signals received through the plurality of antennas a weight information related to the reception antenna weight, the weight information generated based on said channel related information, and transmitting to the communication device communication device multiplies
method comprising.
[Requested item 34]
　Receiving a signal via a plurality of antennas,
　and transmitting the channel-related information on the channel of the signal received via the plurality of antennas to the communication device,
　a weight information related to the reception antenna weight, the the weight information is generated based on the channel related information, comprising: receiving from the communication device,
　the method comprising: multiplying said receive antenna weights to signals received via the plurality of antennas,
the method comprising.
[Requested item 35]
　From the communication device that receives a signal via multiple antennas, receiving a channel-related information on the channel of the signal received via the plurality of antennas,
　the on signals received through the plurality of antennas a weight information relating to the reception antenna weights communication device multiplies the channel the weight information generated on the basis of the related information, and transmitting to the communication device,
a program for executing the processor.
[Requested item 36]
　Receiving a signal via a plurality of antennas,
　and transmitting the channel-related information on the channel of the signal received via the plurality of antennas to the communication device,
　a weight information related to the reception antenna weight, the the weight information is generated based on the channel related information, receiving from the communication device,
　and multiplying the reception antenna weights to the signals received through the plurality of antennas,
to perform the processor program.
[Requested item 37]
　From the communication device that receives a signal via multiple antennas, receiving a channel-related information on the channel of the signal received via the plurality of antennas,
　the on signals received through the plurality of antennas a weight information relating to the reception antenna weights communication device multiplies, the weight information generated based on said channel related information, and transmitting to the communication device,
to a computer which records a program to be executed by the processor readable non-transitory recording medium.
[Requested item 38]
　Receiving a signal via a plurality of antennas,
　and transmitting the channel-related information on the channel of the signal received via the plurality of antennas to the communication device,
　a weight information related to the reception antenna weight, the the weight information is generated based on the channel related information, receiving from the communication device,
　and multiplying the reception antenna weights to the signals received through the plurality of antennas,
to perform the processor non-transitory computer-readable recording medium recording a program.
[Requested item 39]
　A first communication device,
　a second communication device,
wherein the
　second communication device
　　receives the signal via a plurality of antennas,
　　for the channel of the signal received via the plurality of antennas sending channel related information to the first communication device,
　the first communication device
　　receives the channel related information from the second communication device,
　　a weight information related to the reception antenna weight, the channel related the weight information generated on the basis of information, transmitted to the second communication device,
　said second communication device
　　receives the weight information from the first communication device,
　　via the plurality of antennas It said multiplying receive antenna weights to signals received Te,
system.
[Requested item 40]
　In the second communication device,
　　receiving a signal via a plurality of antennas,
　　and transmitting the channel-related information on the channel of the signal received via the plurality of antennas to the first communication device,
　wherein in the first communication device,
　　comprising: receiving the channel-related information from the second communication device,
　　a weight information related to the reception antenna weight, the weight information generated based on said channel related information, wherein and transmitting to the second communication device,
　in the second communication device,
　　comprising: receiving said weight information from said first communication device,
　　the received antenna signals received via the plurality of antennas and multiplying the weight,
the method comprising.