0001]The present disclosure, the terminal apparatus, a base station, a method and a recording medium.
BACKGROUND
[0002]Recently, the 3GPP (Third Generation Partnership Project), are discussed 5G is a next generation communication standard. Communication technology that constitutes the 5G is also referred NR (New Radio Access Technology).
[0003]
　One of the study item of 3GPP Release 14, there is a MIMO (multiple-input and multiple-output) for the NR. The MIMO, a technique for performing beamforming by utilizing a plurality of antennas, beam forming can be 3D (or Full Dimension) three-dimensionally -MIMO, there is Massive-MIMO or the like which utilizes multiple antennas. In MIMO continually provide appropriate beam to a user terminal, accuracy of the beam-tracking techniques has been demanded.
[0004]
　For example, the following Patent Document 1, with respect to beamforming, based on feedback information from the user device, a technique for determining a beam for a user device is disclosed.
CITATION
Patent Document
[0005]
Patent Document 1: JP 2015-164281 JP
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　However, techniques relating to beam tracking proposed in the above patent documents and the like are under discussion still, it is difficult to say that sufficient proposals have been made. For example, techniques for uplink reference signal for beam tracking is also one but not fully proposed.
Means for Solving the Problems
[0007]
　According to the present disclosure, a communication unit that communicates with a base station that communicates by forming a beam, first uplink reference signal, and the first frequency bandwidth of interest as compared to the uplink reference signal terminal device and a control unit for transmitting a narrow transmission period is shorter second uplink reference signal is provided.
[0008]
　Further, according to the present disclosure, a communication unit for communicating with the terminal apparatus to form a beam, the target compares the first uplink reference signal from the terminal device, and the first uplink reference signal and a reception frequency bandwidth is narrow transmission period shorter second uplink reference signals to a control unit for transmitting a first configuration information for the second uplink reference signal to the terminal device, base station comprising a are provided.
[0009]
　Further, according to the present disclosure, to communicate with a base station that communicates by forming a beam and a first uplink reference signal, and the first uplink reference signal and the comparison frequency bandwidth of interest and method comprising, and transmitting is provided by the processor a second uplink reference signal transmission period is short narrow.
[0010]
　Further, according to the present disclosure, and communicating with the terminal apparatus to form a beam, first uplink reference signal from the terminal device, and a target as compared with the first uplink reference signal and to perform the reception frequency bandwidth is narrow transmission period shorter second uplink reference signal, the first processor to send configuration information for the second uplink reference signal to the terminal device, the method comprising is provided.
[0011]
　Further, according to the present disclosure, a computer, a communication unit that communicates with a base station that communicates by forming a beam, and the object compared with the first uplink reference signal, and the first uplink reference signal recording medium having a program recorded thereon for functioning as a controller, a frequency bandwidth is narrow transmission period for transmitting a short second uplink reference signal to be is provided.
[0012]
　Further, according to the present disclosure, the computer compares the communication unit that communicates with the terminal apparatus to form a beam, first uplink reference signal from the terminal device, and the first uplink reference signal and a reception frequency bandwidth is narrow transmission period shorter second uplink reference signal of interest Te, a first control for transmitting the setting information for the second uplink reference signal to the terminal apparatus and parts, recording medium having a program recorded thereon for functioning as is provided.
Effect of the invention
[0013]
　According to the present disclosure described above, the uplink reference signal for beam tracking is provided. Incidentally, the above effect is not necessarily restrictive, with the above effects, or instead of the above effects, any effects shown herein, or other effects that may be grasped from the description, it may be achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014]
It is a diagram for explaining an example of FIG. 1 of a system according to an embodiment of the present disclosure configuration.
2 is a diagram for explaining a study on beam tracking.
3 is a sequence diagram showing an example of a beam tracking procedure of the flow based on the beam informed CSI-RS.
Is a sequence diagram showing an example of the flow of FIG. 4 the beam tracking procedure based on SRS.
5 is a diagram for explaining an example of the format of SRS in LTE.
6 is a diagram for explaining an SRS of a narrowband in LTE.
7 is a block diagram showing an example of a configuration of a base station according to the first embodiment.
8 is a block diagram showing an example of a configuration of a terminal device according to the present embodiment.
9 is a diagram for explaining an example of the SRS of the type B according to the present embodiment.
[10] is a sequence diagram showing an example of the flow of SRS transmission and reception process executed in the system according to the present embodiment.
11 is a diagram for explaining an example of a dynamic transmit setting of the SRS of type B according to the present embodiment.
12 is a sequence diagram showing an example of the flow of SRS transmission and reception process executed in the system according to the present embodiment.
13 is a diagram for explaining the frequency hopping SRS type B according to the present embodiment.
14 is a sequence diagram showing an example of the flow of SRS transmission and reception process executed in the system according to the present embodiment.
15 is a sequence diagram showing an example of the flow of SRS transmission and reception process executed in the system according to the present embodiment.
16 is a diagram for explaining the frequency hopping SRS type B according to the second embodiment.
It is a block diagram showing a first exemplary configuration of FIG. 17] eNB.
Is a block diagram showing a second example of FIG. 18 schematic configuration of eNB.
19 is a block diagram showing an example of a schematic configuration of a smart phone.
Is a block diagram showing an example of a schematic configuration of a [20] a car navigation system.
DESCRIPTION OF THE INVENTION
[0015]
　Reference will now be described in detail preferred embodiments of the present disclosure. In the specification and the drawings, components having substantially the same function and structure are a repeated explanation thereof by referring to the figures.
[0016]
　Further, in this specification and the drawings, elements having substantially the same functional configuration may be distinguished by affixing a different alphabetical letter to the same reference numerals. For example, substantially a plurality of elements having the same function and structure, the base station 100A as needed, distinguished as 100B and 100C. However, when there is no particular need to distinguish between a plurality of elements having the same function and structure are denoted with the same reference numeral only. For example, if the base station 100A, there is no particular need to distinguish between 100B and 100C are simply referred to as base station 100.
[0017]
　The description will be made in the following order.
　　1. System Configuration Example
　　2. Study beam tracking
　　　2.1. Overview of the beam tracking
　　　2.2. SRS
　　　2.3. Other
　　3. Example of the configuration of each of the devices
　　　3.1. Example of the configuration of the base station
　　　3.2. Configuration of the terminal apparatus
　　4. First Embodiment
　　　4.1. Technical problems
　　　4.2. Technical features
　　5. Second Embodiment
　　　5.1. Technical problems
　　　5.2. Technical features
　　6. Application Example
　　7. Summary
[0018]
　<< 1. System Configuration >>
　First, referring to FIG. 1, an example of a configuration of a system according to an embodiment of the present disclosure. Figure 1 is a diagram for explaining an example of a configuration of a system according to the present embodiment. As shown in FIG. 1, a system 1 according to this embodiment includes a base station 100 and the terminal device 200.
[0019]
　The base station 100 may operate the cell 11 is a device that provides wireless communication service to the terminal device 200 in the cell 11. As shown in FIG. 1, base station 100 may be a plurality of present, the base station 100A ~ 100C, each operating a cell 11A ~ 11C, provides wireless communication services to each terminal device 200A ~ 200C. In the example shown in FIG. 1, base station 100A and 100B are small cell base station, the cell 11A and 11B are small cells. The base station 100C is a macrocell base station, the cell 11C is macrocells. Macrocell base station 100C has a function cooperatively controls radio communication by the managed small cell base station 100A and 100B. Incidentally, while the base station 100 is communicatively connected, for example, they are connected by the X2 interface. Further, between the base station 100 and the core network 12 is communicatively connected, for example, are connected by the S1 interface.
[0020]
　Terminal device 200 is a device that communicates with the base station 100. Terminal device 200 will typically have a higher mobility, cell selection according to the movement is performed. Besides, if the beam by the base station 100 or the terminal device 200 is formed, the beam tracking for communicating to form a suitable beam in response to movement of the terminal device 200 is performed.
[0021]
　The base station, in the following sometimes also referred to as eNB (evolved Node B). This is the base station 100 is not limited to be operated by the radio access technology in LTE, it can be operated by 5G radio access technology. That is, the base station may be other call you except eNB. Similarly, below the terminal device may be referred to UE (User Equipment) or a user both, this is not the terminal device 200 is limited to be operated by the radio access technology in LTE, 5G wireless It can be operated by access technology.
[0022]
　The core network 12 includes a control node for controlling the base station 100. The core network 12 may be, for example, include the EPC (Evolved Packet Core), may contain 5G architectures. The core network 12 is connected to a packet data network through the gateway device.
[0023]
　<< 2. Study beam tracking >>
　Hereinafter, a study on beam tracking from each viewpoint.
[0024]
　　<2.1. Beam Tracking Overview>
　　(need for beam
　tracking) the eNB, for example, 256 is 30GHz band, such as 1000 in the 70GHz band, a large number of antennas (more specifically, the antenna element) envisaged that is mounted It is. Depending on the number of antenna elements is increased, it is possible to form a sharper beam. For example, half-width (indicating level of 3dB drop occurs at times higher) went less 1 degree, a very sharp beam, it is possible to provide the eNB to the UE.
[0025]
　Environment in which very sharp beam is formed, when the UE moves at high speed (e.g., when moving at a speed of 500 Km), it is assumed that UE will come out easily out of the beam. The UE will go out of the beam, the transmission of data from the eNB to the UE becomes difficult. Accordingly, as shown in FIG. 2, it is desirable that the beam is capable of following the UE moving fast (tracking).
[0026]
　Figure 2 is a diagram for explaining the Study beam tracking. As shown in FIG. 2, in accordance with the movement of the UE, it is desirable to follow the beam eNB forms.
[0027]
　　(Codebook-based beamforming)
　In LTE, by changing the beam steplessly, possibly mechanism that recreate the beam to follow the UE is employed is low. Computational cost to rebuild a new beam is because occur. Therefore, previously formed in advance beam towards any direction from the eNB, a scheme for by selecting the beam used for communication with the UE from a beam which has been formed on the pre-found 3GPP Release 13 It has been adopted in the FD-MIMO (full dimension multi input multi output). Such a mechanism is also referred to as a codebook-based beamforming (codebook based beam forming).
[0028]
　For example, if the beam is provided in increments of 1 ° to the horizontal 360-degree, so that the 360 ​​beam is provided. If the beam overlap each other half, so that the 720 beams are provided. If the beam is provided equally to +90 degrees from vertical -90 degrees, so that the 360 ​​beam 180 degrees is provided.
[0029]
　In the codebook-based beamforming, the beam tracking means that out of the beam which is prepared in advance as a code book continues to select the beam suitable for communication with UE.
[0030]
　　(Beam tracking based on the reference signal
　downlink) in 3GPP RAN1 Release 13 FD-MIMO, study on beam selection has been made. In this study, eNB is beamformed reference signal downlink: based on (RS reference signal), were examined to select a beam suitable for communication with UE. Reference signal such downlink, also referred beam informed CSI-RS (channel state information- reference signal). eNB provides a plurality of beams informed CSI-RS (multiple beamformed CSI- RS), communicates with the UE by using the beam corresponding to the reception result of the UE. Referring to FIG. 3, the beam tracking procedure based on the beam informed CSI-RS.
[0031]
　Figure 3 is a sequence diagram showing an example of a beam tracking procedure of the flow based on the beam informed CSI-RS. As shown in FIG. 3, first, eNB, using a plurality of beams, and transmits a plurality of beams informed CSI-RS (step S11). Then, UE, based on the reception result of the plurality of beamformed de CSI-RS provided, select the desired beam from a plurality of beams used for the transmission of the beam informed CSI-RS, a selection result It transmits information indicating the eNB (step S12). Information indicating the selection results (typically, beam number) desired beam identification information including. For example, UE is the desired beam one or a plurality selected based on the received power of each beam. Then, eNB provides user data beamformed by the selected beam to the UE (step S13).
[0032]
　According to such a procedure, depending on whether is provided to the UE at a frequency of how a set of a plurality of beams informed CSI-RS, changes tracking capability. For example, when provided in each 100ms, tracking will be done by 100ms of granularity. 100ms between, when the UE is moving at a speed that remains in the beam, if this is good for tracking at the granularity, the UE speed increases, for example, the tracking of the following granularity 5ms are requiring come out also. In this case, since the overhead of the downlink resources for providing a set of beams informed CSI-RS is large, efficient communication becomes difficult.
[0033]
　　(Beam tracking based on the reference signal uplink)
　eNB is whether to transmit a plurality of beams informed CSI-RS described above with reference to any plurality of beams, typically based on the reference signal uplink decide. The eNB knows the general location of the UE based on the reference signal uplink, multiple select the appropriate beam candidates in the UE, a plurality of beams informed CSI using candidates of a plurality of beams selected to send -RS. Reference signals of the uplink, also referred SRS (Sounding Reference Signal). Referring to FIG. 4, the beam tracking procedure based on SRS.
[0034]
　Figure 4 is a sequence diagram showing an example of the flow of the beam tracking procedure based on SRS. As shown in FIG. 4, first, UE transmits SRS in the eNB (step S21). Then, eNB, based on the reception result of the SRS, obtains channel information between the UE and the eNB, selecting a plurality of beam used for transmitting a plurality of beams informed CSI-RS based on the channel information ( step S22). Thereafter, in step S23 ~ 25, with reference to the same processes as in the step S11 ~ S13 in which the above-described FIG. 3 is performed.
[0035]
　In the case of TDD (Time Division duplex), since the radio resources are used by switching between uplink and downlink alternately in time, channel information in the uplink and in the downlink is the same. On the other hand, in the case of FDD (Frequency Division duplex), since the frequency used in the uplink and downlink differ, channel information between the uplink and downlink are different. Therefore, in step S21, eNB channel information acquisition (the precisely estimated) downlink based on the SRS can is given, it can be said that for TDD only.
[0036]
　　<2.2. SRS>
　SRS, rather than beam selection described above, eNB is operational frequency bandwidth (i.e., bandwidth) to obtain the channel information of the uplink in a main purpose of using it for scheduling downlink to.
[0037]
　Scheduling refers to the UE whether the determined eNB uses a portion of the downlink or uplink resources (separated unit resources in frequency and time) throat, and notifies the determined content to the UE. For example, if bandwidth eNB is operated is 20 MHz, the resource block includes twelve subcarriers are arranged at 15kHz intervals, 100 resource blocks are laid in the 20MHz. Resources of 100 resource blocks are used in Wakea' a plurality of UE. In other words, FDM (Frequency Division Multiplexing) is carried out. Therefore, it can be said that to determine whether to UE to use which part in the 20 MHz, a scheduling eNB.
[0038]
　eNB based on the SRS, to achieve the main object described above. For more information, eNB obtains channel information of an uplink based on the reception result of the SRS, and estimates channel information of the downlink based on the acquired channel information, the scheduling based on the estimated channel information of the downlink do.
[0039]
　Such existing SRS designed for primary purpose of scheduling is considered not suitable as a reference signal for beam selection. For example, for beam tracking is not always necessary channel information across the channel.
[0040]
　　(The format of SRS)
　FIG. 5 is a diagram for explaining an example of the format of SRS in LTE. LTE uplink is operated in SC-FDMA (Single Carrier Frequency Division Multiple Access), includes 14 symbols per subframe. Time direction symbol in the uplink, also referred SC-FDMA symbol or OFDM symbols. As shown in FIG. 5, SRS is transmitted with the last OFDM symbol. However, in all subframes, SRS by using the last OFDM symbol are not always transmitted. For example, typically, using all 14 OFDM symbols, a user data PUSCH (Physical Uplink Shared Channel) and the control signal a is PUCCH (Physical Uplink Control Channel) is transmitted. Then, only when necessary, SRS is transmitted with the last OFDM symbol.
[0041]
　　(SRS and wideband SRS of a narrowband)
　, as shown in FIG. 5, there is a case where SRS is transmitted occupying all the bandwidth that is operated at a time. On the other hand, in some cases it is used some of the bandwidth to be operational in one SRS transmission. The former is also referred to as wideband SRS, the latter also referred narrowband SRS.
[0042]
　Figure 6 is a diagram for explaining an SRS of a narrowband in LTE. As shown in FIG. 6, SRS narrowband, the time of transmission portion of the bandwidth is used. However, in order to achieve the above main object of knowing the channel state of the entire band width to be operated, even narrowband SRS, by shifting the bandwidth used for the transmission as shown in FIG. 6, eventually so that the SRS is transmitted over the entire band width to be operational. Advantages of narrowband SRS is because it can be used for transmission of the UE once more power SRS, is that it can increase the uplink coverage of the SRS. In other words, the benefits of narrowband SRS is that it is possible to improve the quality of the SRS received by eNB.
[0043]
　It should be noted here, broadband, none of the SRS of a narrowband, is that it is designed as a main objective to be acquired channel information of the entire band width to be operated. In other words, broadband, none of the SRS of the narrow-band, band width of interest, is the entire band width of the eNB is to operate.
[0044]
　　(Periodic SRS and aperiodic
　SRS) eNB is to transmit the SRS periodically (periodic), or to send a non-periodic (Aperiodic), it can be set to the UE.
[0045]
　eNB, when setting the periodic SRS, set using the RRC (Radio Resource Control) signaling the quasi-static (semi-static). Thus, for periodic transmissions, for example, it is difficult to change the transmission period dynamically.
[0046]
　On the other hand, with respect to non-periodic SRS, eNB may aperiodically transmits an SRS request if necessary, UE sends back the SRS in the case of receiving the SRS request. However, aperiodic SRS is considered not suitable as a reference signal for selecting the regular beam for beam tracking. This is because, SRS request of the downlink is because becomes overhead.
[0047]
　　(SRS and relationship with beam selection)
　eNB, when providing the beam to UE, it is desirable to select the appropriate beam for UE.
[0048]
　One way for them, as referred to above description of FIG. 3 and FIG. 4, eNB will provide a plurality of beamformed de reference signal, the UE using the beam corresponding to the reception result at the UE to perform the communication it can be considered. In this case, as described above with reference to FIG. 4, eNB may or transmitting a plurality of beams informed reference signal with which a plurality of beams can be determined based on the SRS. Because, eNB is because it can be grasped roughly the direction of the UE based on reception result of the SRS.
[0049]
　Thus, SRS can be used for beam selection to be provided to the UE. On the other hand, the SRS from a reference signal of the uplink, eNB to know the status of the interference in the downlink based on the reception result of the SRS is difficult. Thus, the final beam selection on the basis of the reference signal of the downlink, it is desirable that determined by the UE.
[0050]
　　(Summary)
　has been described above with respect to SRS. The considerations when using SRS in beam tracking, summarized below.
[0051]
　The first considerations, the existing SRS is is that it is primarily intended to acquire the channel information of the entire band width to be operated. Existing SRS, if you want to know only the direction of the beam as the beam tracking becomes overhead transmission efficiency when the uplink used for beam tracking may decrease.
[0052]
　The second keep in mind, the both periodic SRS and aperiodic SRS, is that not suitable for beam tracking applications. For example, all the UE, but it does not require a very accurate tracking.
[0053]
　Third considerations is that it is difficult to know the status of the interference in the downlink in SRS. Selection of the final beam is preferably performed on the basis of a reference signal of the downlink.
[0054]
　　<2.3. Others>
　The degree of difficulty of the beam tracking discussed below.
[0055]
　First, if the UE is stationary motionless at all is assumed. In that case, since in many cases there is no change to the appropriate beam for UE, beam selection for beam tracking is easy. However, it is stationary UE is the environment around, for example, shielding covering of such vehicle or person of the beam due to such crossing between the eNB and UE (hereinafter, blocking also referred to) again beam selection the effect of there is also a case to be carried out.
[0056]
　Also, if the UE moves at high speed is assumed. In that case, since is possible to follow the beam is requiring the UE to move to the high speed, difficulty of beam tracking is high. If the beam provided to the UE is sharp ones, difficulty of beam tracking becomes more higher. For example, when the beam of 1 degree width are provided, difficulty as compared with the case where the beam of e.g. 10 degrees width provided is high. Higher beam sharp, because less time the UE moves within the range included in the beam.
[0057]
　Regardless of the moving speed of the UE, if the change in the discontinuous channel environment occurs, difficulty of beam selection becomes high. Change of discontinuous channel environment, for example, shield cases enters suddenly between the eNB and the UE, and antenna can occur when like the UE being located in a plane rotated rapidly. In such cases, appropriate beam may vary for UE. It is also contemplated that directly than the beam that reaches the UE, indirectly better the beam reaching the UE may be appropriate to reflect.
[0058]
　<< 3. Configuration example of each device >>
　Subsequently, an example of a configuration of each device included in the system 1 according to an embodiment of the present disclosure.
[0059]
　　<3.1. Configuration example of the base station>
　Fig. 7 is a block diagram showing an example of a configuration of a base station 100 according to this embodiment. Referring to FIG. 7, the base station 100 includes an antenna unit 110, the wireless communication unit 120, a network communication unit 130, storage unit 140, and a control unit 150.
[0060]
　(1) Antenna unit 110
　antenna unit 110 radiates into the space a signal output by the radio communication unit 120 as a radio wave. The antenna unit 110 converts the radio waves of space signal, and outputs the signal to the radio communication unit 120.
[0061]
　Especially, in this embodiment, the antenna unit 110 has a plurality of antenna elements, it is possible to form a beam.
[0062]
　(2) wireless communication unit 120
　radio communication unit 120 transmits and receives signals. For example, wireless communication unit 120 transmits a downlink signal to the terminal device, it receives uplink signals from the terminal device.
[0063]
　Especially, in this embodiment, the wireless communication unit 120 is capable of communicating with the terminal apparatus 200 to form a plurality of beams by the antenna unit 110.
[0064]
　(3) Network communication unit 130
　network communication unit 130 sends and receives information. For example, the network communication unit 130 transmits the information to other nodes, to receive information from other nodes. For example, the other nodes, including other base stations and a core network node.
[0065]
　(4) storage unit 140
　storage unit 140 temporarily or permanently storing a program and various data for the operation of the base station 100.
[0066]
　(5) Control unit 150
　The control unit 150 provides various functions of the base station 100. Control unit 150 includes a setting unit 151 and the communication control unit 153. The control unit 150 may further include other components other than these components. That is, the control unit 150 may perform also the operation other than the operation of these components. Operation of the setting unit 151 and the communication control unit 153 will be described in detail later.
[0067]
　　<3.2. Configuration> of the terminal device
　8 is a block diagram showing an example of a configuration of a terminal apparatus 200 according to this embodiment. Referring to FIG. 8, the terminal device 200 includes an antenna unit 210, radio communication unit 220, storage unit 230, and a control unit 240.
[0068]
　(1) Antenna unit 210
　antenna unit 210 radiates into the space a signal output by the radio communication unit 220 as a radio wave. The antenna unit 210 converts the radio waves of space signal, and outputs the signal to the wireless communication unit 220.
[0069]
　(2) wireless communication unit 220
　radio communication unit 220 transmits and receives signals. For example, wireless communication unit 220 receives the downlink signal from the base station, transmits an uplink signal to the base station.
[0070]
　Especially, in this embodiment, the wireless communication unit 220 may communicate with a base station 100 that communicates with a plurality of beams.
[0071]
　(3) storage unit 230
　storage unit 230 temporarily or permanently storing a program and various data for the operation of the terminal apparatus 200.
[0072]
　(4) Control unit 240
　The control unit 240 provides various functions of the terminal apparatus 200. Control unit 240 includes a setting unit 241 and the communication control unit 243. The control unit 240 may further include other components other than these components. That is, the control unit 240 may perform also the operation other than the operation of these components. Operation of the setting unit 241 and the communication control unit 243 will be described in detail later.
[0073]
　Hereinafter, it referred to the base station 100 also eNB 100, the terminal device 200 is also referred to as UE 200.
[0074]
　<< 4. First Embodiment >>
　The first embodiment is a basic embodiment UE200 transmits an uplink reference signal for beam selection.
[0075]
　　<4.1. Technical problem>
　As described above, SRS can also narrowband case of wideband, to acquire the channel information of the entire bandwidth eNB to operate were the primary purpose. The uplink reference signal is designed for beam tracking did not exist. Therefore, in the present embodiment, efficient beam tracking (i.e., UE tracking (beam selection for UE)) to provide an uplink reference signal to enable.
[0076]
　　<4.2. Technical features>
　following describes the technical feature of this embodiment.
[0077]
　　(1) beam selection SRS 　SRS
　　of type B
UE 200 (e.g., the communication control unit 243), the band width of interest as compared to the first uplink reference signal, and the first uplink reference signal is narrow transmission cycle to transmit a short second uplink reference signal. By the first uplink reference signal and the second uplink reference signal is used in combination, eNB 100 is able to perform efficient beam tracking while performing scheduling.
[0078]
　First uplink reference signal, an uplink reference signal with the primary purpose of acquiring the channel information of the entire bandwidth eNB100 is operated. That is, the first uplink reference signal is directed to the whole bandwidth to be operated communication possible bandwidth with eNB 100, i.e. the eNB 100. For example, the first uplink reference signal may be a wideband SRS or narrowband SRS as described above. Hereinafter, the first uplink reference signal, also referred to as SRS type A.
[0079]
　Second uplink reference signal, an uplink reference signal with the primary aim to allow used for beam tracking by eNB 100, an efficient beam tracking. Hereinafter, the second uplink reference signal, also referred to as SRS type B. Hereinafter, with reference to FIG. 9, a description will be given SRS type B.
[0080]
　Figure 9 is a diagram for explaining an example of the SRS of the type B according to the present embodiment. As shown in FIG. 9, the SRS type B, for example, when bandwidth eNB is operated is 20 MHz, a portion of bandwidth (e.g., 1MHz or the like) as the target, 5 ms (milliseconds), etc. It is of the transmission in the transmission cycle. In FIG. 9, SRS type A is omitted.
[0081]
　As shown in FIG. 9, SRS type B is the bandwidth of interest as compared to the SRS of the type A is narrow. SRS of type A, white in a narrow band white in a wide band, the band width of interest is a whole band width eNB is to operate. Meanwhile, SRS type B is directed to the part of the bandwidth eNB is operated. That, SRS type B is directed to the part of the bandwidth of the total bandwidth to be operated communication possible bandwidth with eNB 100, i.e. the eNB 100. SRS type B, since the bandwidth of interest as compared to the SRS of the type A is narrow, it is possible to transmit the SRS for efficient beam tracking down the bandwidth.
[0082]
　Further, as shown in FIG. 9, SRS plurality of type B, may be periodically transmitted in the same frequency position. Note that the frequency position refers to the position in the frequency domain. Thus, eNB 100 can to know the changes in the channel information in the same frequency position can be performed appropriately beam tracking.
[0083]
　Further, SRS of type B, the transmission period as compared to the SRS of the type A is short. That, SRS type B as compared to the SRS of the type A is transmitted at high frequency. For example, type B SRS is it is desirable sent in 10 millisecond intervals from 5 milliseconds. In particular, if the 5 ms, for example UE200 to move at a speed of 500km may communicate with the eNB100 FWHM leaves 20m to form the following beam once. Such short transmission period, even when the UE200 is moving fast, eNB 100 is able to beam tracking.
[0084]
　The UE for SRS transmission period of the type B for the in a well-beam tracking possible when moving fast, will be described with reference to Tables 1 to 3 below. Tables 1 to 3, TRP (Transmission / Reception Point) and for each distance between the UE, located in and around the area where the beam reaches (radius of one beam reaches region) transmitted by the beam radius from TRP to UE UE which indicates the time to deviate from the region. Table 1 shows a case where UE is moving at a speed 30 km, Table 2 shows a case where UE is moving at a speed of 120 km, Table 3 if the UE is moving at a speed of 250km (e.g., highways It shows the V2X (Vehicle to Everything)) in. In Tables 1 to 3, if the time following time UE located in the center of the area where the beam reaches until it releases from the region, is acceptable as the interval of the beam selection. In other words, in Tables 1 to 3, UE located in the center of the area where the beam reaches the time following time to deviate from the region, to be employed as a transmission interval of the type B SRS is desirable. In this regard, as shown in Tables 1 to 3 below, if the transmission period is 5 ms, meet this requirement in any case envisaged, if the transmission period is 10 ms, in most cases meet this requirement.
[0085]
[Table 1]

[0086]
[Table 2]

[0087]
[table 3]

[0088]
　　Type operation based on the SRS of B
　eNB 100 (e.g., the communication control unit 153) is of type A from the UE 200 SRS, and type narrow transmission cycle bandwidth of interest as compared to the SRS of A is a short type B to receive the SRS. eNB100, based on the reception result of the SRS type A, and acquires the channel information of the entire bandwidth of operating, performs scheduling. Further, eNB 100 based on the reception result of the type B SRS, selecting a beam suitable for UE 200.
[0089]
　　Type setting for the SRS B
　eNB 100 (e.g., the setting unit 151) performs the transmission of the setting information for the SRS type B to UE 200 (corresponding to first setting information). Then, UE 200 (e.g., the setting unit 241) performs transmission setting for the SRS Type B based on the setting information received from the eNB 100. Setting information, for example the transmission period, and may include information indicating a frequency position and width of the bandwidth of interest. Accordingly, UE 200 can transmit the SRS type B at the indicated transmission cycle, and bandwidth from eNB 100.
[0090]
　　· Processing Flow
　With reference to FIG. 10, an example of the flow of SRS transmission and reception processing according to the present embodiment. SRS transmission and reception processing, for example the beam tracking procedure based on SRS as described above with reference to FIG. 4 is supposed to be followed also in the NR, it may be performed in step S21. That, SRS transmission and reception processing described below may be included in the beam tracking procedure.
[0091]
　Figure 10 is a sequence diagram showing an example of the flow of SRS transmission and reception process executed in the system 1 according to this embodiment. As shown in FIG. 10, in this sequence, eNB 100 and UE200 are involved.
[0092]
　First, eNB 100 transmits the setting information for the SRS types A to UE 200 (step S102). The setting information includes, for example, information indicating the transmission cycle. Then, eNB 100 transmits the setting information for the type B SRS to UE 200 (S104). The setting information includes, for example, information indicating a frequency position and width of the bandwidth to be transmitted periodically as well as subject.
[0093]
　Then, eNB 100 transmits the SRS in type A in a long transmission period, and transmits the SRS type B with a short transmission period. For example, eNB 100, after transmitting the SRS type B (step S106), and transmits the SRS Type A (step S108), and then transmits the SRS type B with a short transmission period (steps S110 ~ S116). Thereafter Similarly, eNB 100 transmits the SRS Type A (step S118), and transmits the SRS type B with a short transmission period (step S120, S122, abbreviated hereafter). As shown in FIG. 10, the transmission cycle of the SRS of type A longer transmission period of the SRS of the type B is short.
[0094]
　　(2) dynamic configuration
　eNB 100 (e.g., the setting unit 151) may be performed dynamically SRS transmission setting of the type B. Hereinafter, with reference to FIG. 11, described dynamic transmission setting of the type B SRS.
[0095]
　Figure 11 is a diagram for explaining an example of a dynamic transmit setting of the SRS of type B according to the present embodiment. In the example shown in FIG. 11, each time the SRS of type A are transmitted, the frequency position of bandwidth SRS type B is transmitted is changing dynamically.
[0096]
　For example, eNB 100 (e.g., the setting unit 151), based on the type A SRS reception result of, may be performed SRS transmission setting of the type B. Then, eNB 100 is set according to the reception result of the SRS of the type A information (corresponding to first setting information) may be transmitted to the UE 200. For example, eNB 100 is the frequency location of bandwidth SRS type B is intended, set based on the SRS reception result type A. Specifically, eNB 100 was obtained based on the type A reception result of the SRS, based on the channel information of the entire bandwidth of operation, channel quality (e.g., SINR (Signal Noise Interference Ratio)) Good frequency positions to, SRS of type B to set the band width of interest. That is, bandwidth SRS type B is intended, the channel quality based on the reception result of the SRS of type A may be a bandwidth of good frequency location. Configuration information, other frequency positions bandwidth of interest may include information indicating a width of the bandwidth of interest, and the transmission period or the like. Accordingly, UE 200 as the target bandwidth good frequency location of the channel quality, it is possible to transmit the SRS type B. In contrast, if, when the SRS type B band width of the channel quality is poor frequency position is transmitted, there is a possibility that eNB100 will continue to fail in the tracking. If eNB 100 fails even once in the reception of the SRS type B, the beam tracking becomes difficult in eNB 100.
[0097]
　In the overall operation is the bandwidth, and the bad frequency position the channel quality is good frequency position can coexist. As narrowband SRS as described above, it is also conceivable for the frequency hopping SRS type B, and the influence of fading or the like, there is a possibility that SRS is transmitted with the bandwidth of the frequency position not appropriate. Accordingly, eNB 100, by acquiring the type channel information of the entire bandwidth, which is operated by SRS of A at any time, that the SRS of type B is set dynamically and appropriately the frequency position of the bandwidth of interest possible it is.
[0098]
　However, when the transmission setting each time the SRS of type B is transmitted is performed, downlink overhead is increased for transmission of the setting information from the eNB 100. Therefore, as shown in FIG. 11, eNB 100 may perform periodic transmission setting. In the example shown in FIG. 11, eNB 100 is is transmitting settings every time the SRS of type A is received, the SRS type A may perform transmission settings from being turned more, the setting only it may transmit set if a change is there.
[0099]
　In FIG 11, a band width continuously of interest (i.e., the bandwidth of consecutive stretches), an example is shown in which hopping is performed in which the present technology is not limited to such an example. For example, the bandwidth of interest may be a plurality of bandwidths that discrete, hopping across a plurality of bandwidth discrete may be performed.
[0100]
　Of course, eNB 100 is without using a reception result of the SRS type A, it is possible to perform the transmission setting type B, by using the reception result of the SRS type A, perform more appropriate transmission setting it becomes possible.
[0101]
　　· Processing Flow
　Referring now to FIG. 12, an example of the flow of SRS transmission and reception processing according to the present embodiment. SRS reception processing described below may be included in the beam tracking procedure.
[0102]
　Figure 12 is a sequence diagram showing an example of the flow of SRS transmission and reception process executed in the system 1 according to this embodiment. As shown in FIG. 12, in this sequence, eNB 100 and UE200 are involved.
[0103]
　First, eNB 100 transmits the setting information for the SRS types A to UE 200 (step S202). The setting information includes, for example, information indicating the transmission cycle. Then, eNB 100 transmits the setting information for the type B SRS to UE 200 (S204). The setting information includes, for example, information indicating a frequency position and width of the bandwidth to be transmitted periodically as well as subject.
[0104]
　Then, UE 200 transmits the SRS Type A (step S206). Then, eNB 100 may transmit, based on the reception result of the SRS type A, to set the frequency position of the SRS of the type B (step S208), the setting information for the SRS type B that reflects such settings to UE200 (step S210). Thereafter, UE 200 transmits the SRS type B with a short transmission period (steps S212 ~ S218). Then, the process in the step S206 ~ S218 are repeated (steps S220 ~ S228, abbreviated hereafter).
[0105]
　　(3) Frequency hopping
　UE 200 (e.g., the communication control unit 243), in the bandwidth of interest, may be transmitted with the SRS type B is frequency hopping. By frequency hopping, it is possible to reduce the influence of noise or the like. Hereinafter, with reference to FIG. 13, described frequency hopping type B SRS.
[0106]
　Figure 13 is a diagram for explaining the frequency hopping SRS type B according to the present embodiment. In the example shown in FIG. 13, UE 200, in the bandwidth of interest, are transmitted while the SRS type B is frequency hopping. Bandwidth of interest, as described above with reference to FIG. 11, may be set based on the reception result of the SRS of type A by eNB 100. Therefore, as shown in FIG. 13, the frequency position of the bandwidth of interest, can be dynamically changed each time the SRS of type A is transmitted.
[0107]
　As described above, when the eNB 100 fails even once in the reception of the SRS type B, the beam tracking becomes difficult in eNB 100. Therefore, while the target bandwidth good frequency location of the channel quality, by further frequency hopping in bandwidth of interest, it is possible to reduce more the failure probability of tracking.
[0108]
　　Type B Configuration for SRS
　setting information transmitted from the eNB 100 (corresponding to first setting information) may include setting information related to the frequency hopping type B SRS. And setting information related to the frequency hopping includes information indicating, for example, a frequency hopping pattern. Accordingly, UE 200 can transmit the SRS for type B by using a frequency hopping pattern indicated by the eNB 100.
[0109]
　　(4) set based on the downlink reference signal
　UE 200 (e.g., the setting unit 241), based on the downlink reference signal received from eNB 100, may transmit setting for the type B SRS. For example, UE 200, based on the downlink reference signal, to set the frequency position and width of the bandwidth of interest, to set the transmission period, and to set the frequency hopping pattern. Thus, eNB 100 can, since it without sending the configuration information whenever configuration changes to UE 200, along with reducing the processing load of the eNB 100, it is possible to reduce the overhead of the downlink. Furthermore, it can be omitted until the transmission of the type A SRS, in which case, it is possible to also reduce the uplink overhead.
[0110]
　It said downlink reference signal may be, for example, CSI-RS. eNB100 may transmit CSI-RS in the whole bandwidth to operate, for example.
[0111]
　UE 200 (e.g., the setting unit 241) was based on the downlink reference signal, setting information indicating a transmission setting for the SRS type B (corresponding to the second setting information), and transmit to the eNB100 good. Then, eNB 100 (e.g., the setting unit 151) performs reception setting for the SRS Type B based on the setting information received from the UE 200. This configuration information is also seen as setting information related to the frequency hopping. Such configuration information may include other frequency hopping pattern, for example, a transmission period, the information indicating the frequency position and the width of the bandwidth of interest.
[0112]
　　· Processing Flow
　Hereinafter, with reference to FIGS. 14 and 15, an example of the flow of SRS transmission and reception processing according to the present embodiment. SRS reception processing described below may be included in the beam tracking procedure.
[0113]
　Figure 14 is a sequence diagram showing an example of the flow of SRS transmission and reception process executed in the system 1 according to this embodiment. As shown in FIG. 14, in this sequence, eNB 100 and UE200 are involved. This sequence represents the case where the second setting information is not transmitted.
[0114]
　First, eNB 100 transmits the setting information for the type B SRS to UE 200 (step S304). The setting information includes, for example, information indicating a frequency position and width of the bandwidth to be transmitted periodically as well as subject.
[0115]
　Then, eNB 100 transmits a CSI-RS to UE 200 (step S306). Next, UE 200, based on the reception result of the CSI-RS, setting the frequency position and the frequency hopping pattern of the type B SRS (step S308). Then, eNB 100 transmits the SRS type B in a short transmission period based on such set (step S310 ~ S316). Then, the process in the step S306 ~ S316 are repeated (steps S318 ~ S324, abbreviated hereafter).
[0116]
　Figure 15 is a sequence diagram showing an example of the flow of SRS transmission and reception process executed in the system 1 according to this embodiment. As shown in FIG. 15, in this sequence, eNB 100 and UE200 are involved. This sequence represents the case where the second setting information is transmitted.
[0117]
　First, eNB 100 transmits the setting information for the type B SRS to UE 200 (step S404). The setting information includes, for example, information indicating a frequency position and width of the bandwidth to be transmitted periodically as well as subject.
[0118]
　Then, eNB 100 transmits a CSI-RS to UE 200 (step S406). Next, UE 200, based on the reception result of the CSI-RS, set the frequency position and the frequency hopping pattern of the type B SRS (step S408), and transmits the setting information related to the frequency hopping that reflects such settings to eNB100 (step S410). Thereafter, UE 200 transmits the SRS type B with a short transmission period (steps S412 ~ S418). Then, the process in the step S406 ~ S418 are repeated (steps S420 ~ S428, abbreviated hereafter).
[0119]
　　(5) Supplement
　In the above, SRS of type A, has been described assuming a periodic SRS, SRS type A may be aperiodic SRS. However, for aperiodic SRS, periodic SRS is equal to or longer transmission period any more is assumed to be set. Because the SRS type A, because the acquisition of the channel information of the entire band width to be operated is the main object, it sends cycle than SRS type B is short because not envisaged. Further, in the above description illustrates the SRS of type A as broadband SRS, SRS type A can be a narrowband SRS.
[0120]
　<< 5. Second Embodiment >>
　The second embodiment was frequency hopping in a plurality of types of frequency hopping patterns, the SRS of a plurality of types B UE 200 is in the form of transmitting.
[0121]
　　<5.1. Technical problem>
　As described above, when the eNB 100 fails even once in the reception of the SRS type B, the beam tracking becomes difficult in eNB 100. Thus, SRS type B, it is important to be correctly received each time the eNB 100. Here, the same uplink resource in adjacent eNB100 each other may be used. In that case, the SRS of the type B transmitted from UE200 to connect to a cell adjacent to the SRS of the type B transmitted from UE200 to connect to a cell, there is a risk of collision. If a collision occurs, the thus fails to receive the SRS type B in eNB 100, the beam tracking will fail.
[0122]
　Here, when applied to frequency hopping SRS type B, if different between UE connected to a cell whose frequency hopping pattern are adjacent, the probability of the collision is considered to be reduced. However, even as the frequency hopping pattern is different, if the period of the hopping is different, etc., still remains the possibility of a collision.
[0123]
　　<5.2. Technical
　features> UE 200 (e.g., the communication controller 243) may each SRS of the plurality of types B, may be multiplexed using different frequency hopping patterns to each other. Accordingly, even if a collision in some of the frequency hopping pattern has occurred, if a collision occurs in another part of the frequency hopping pattern, it is possible to avoid a failure of the beam tracking. In other words, by multiplexing an SRS in plurality of type B with different frequency hopping patterns to each other, it becomes possible to reduce the probability of beam tracking may fail. Hereinafter, with reference to FIG. 16, described multiplexing with different frequency hopping patterns SRS type B.
[0124]
　Figure 16 is a diagram for explaining the frequency hopping SRS type B according to the present embodiment. In the example shown in FIG. 16, UE 200 is transmitting SRS type B obtained by frequency hopping with frequency hopping pattern X, and the SRS of type B obtained by frequency hopping with frequency hopping pattern Y. As shown in FIG. 16, a plurality of frequency hopping patterns used are different from each other. Different from in this one another, as shown in FIG. 16, hopping position at the same timing, means different respectively. By such a difference in frequency hopping pattern, between SRS type B transmitted from at least the same UE 200, it is possible to avoid a collision occurs.
[0125]
　On the other hand, the base station 100 (e.g., the setting unit 151) sets a plurality of frequency hopping patterns different from each other used for transmitting the type B SRS to UE 200. For example, eNB 100 based on the reception result of the SRS type A, may set the frequency hopping pattern. Thus, eNB 100, in the bandwidth of the channel quality is good frequency position, for example, a plurality of types of frequency hopping pattern including at least interference is not affected or lower frequency hopping pattern from neighboring cells, may give used UE200 It can become. Therefore, it is possible to further reduce the probability of beam tracking may fail.
[0126]
　Additional frequency hopping pattern may be set by the UE200 based on the reception result of the CSI-RS transmitted from eNB 100.
[0127]
　In the example shown in FIG. 16, hopped individual SRS is have been transmitted at the same timing among different frequency hopping pattern, the present technology is not limited to such an example. The timing, for example, may be offset by such offset is added.
[0128]
　<< 6. Applications >>
　according to the disclosed technique is applicable to various products. For example, base station 100 may be implemented as a macro eNB or any type of eNB, such as small eNB (evolved Node B). Small eNB may pico eNB, such as micro eNB or Home (femto) eNB, or a eNB to cover smaller cells than macrocells. Alternatively, the base station 100 may be implemented as a base station for other types, such as NodeB or BTS (Base Transceiver Station). The base station 100 includes a main body (also referred to as a base station device) that controls the wireless communication, one or more RRH placed in a different location from the main body (Remote Radio Head) and may contain. Further, by different types of terminal to be described later to perform a temporary or semi-permanent base station function, it may operate as the base station 100.
[0129]
　In addition, for example, the terminal device 200, a smart phone, a tablet PC (Personal Computer), notebook PC, a portable game terminal, portable / dongle type mobile router or mobile terminal, such as a digital camera or a vehicle-mounted terminal such as a car navigation device, it may be implemented as. The terminal device 200 may be implemented as M2M (Machine To Machine) (also called MTC (Machine Type Communication) terminal) terminal that performs communications. Further, the terminal device 200, wireless communication module mounted on these terminals (e.g., an integrated circuit module consists of a single die) may be used.
[0130]
　　<6.1. Applications for the base station Example>
　　　(first applied example)
　FIG. 17 is a block diagram showing a first example of a schematic configuration of an eNB of the technology according to the present disclosure may be applied. eNB800 has one or more antennas 810, and the base station apparatus 820. Each antenna 810 and base station apparatus 820 may be connected to each other via a RF cable.
[0131]
　Each antenna 810, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by the base station apparatus 820. eNB800 has a plurality of antennas 810 as shown in FIG. 17, a plurality of antennas 810, for example, may correspond to a plurality of frequency bands eNB800 uses. Although in FIG. 17 shows an example in which ENB800 has a plurality of antennas 810, ENB800 may have a single antenna 810.
[0132]
　The base station apparatus 820 includes a controller 821, a memory 822, a network interface 823 and a wireless communication interface 825.
[0133]
　The controller 821 may be, for example, a CPU DSP, or to operate the various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821, the data from the plurality of baseband processor generates the bundled packets by bundling the generated bundled packets may be transferred. The controller 821, radio resource management (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), executes the control such as the inflow control (Admission Control) or scheduling (Scheduling) Logical it may have a function. Further, the control may be performed in conjunction with the periphery of the eNB or the core network node. Memory 822 includes RAM and ROM, and stores a program executed, and various control data (e.g., terminal list, such as the transmission power data and scheduling data) by the controller 821.
[0134]
　Network interface 823 is a communication interface for connecting the base station apparatus 820 to the core network 824. Controller 821 via the network interface 823 may communicate with the core network node, or other eNB. In that case, the ENB800, the core network node, or other eNB, may be connected to one another by logical interfaces (e.g., S1 interface or X2 interface). Network interface 823 may be a wired communication interface, or a wireless communication interface for wireless backhaul. If the network interface 823 is a wireless communication interface, a network interface 823 may use a higher frequency band than the frequency band used for radio communication by the wireless communication interface 825.
[0135]
　Wireless communication interface 825, LTE supports either a cellular communication system such as (Long Term Evolution) or LTE-Advanced, via the antenna 810 to provide wireless connectivity to the terminal located in the cell of ENB800. Wireless communication interface 825 typically may include such baseband (BB) processor 826 and RF circuit 827. BB processor 826, for example, the encoding / decoding may be performed such as modulation / demodulation and multiplexing / demultiplexing, each layer (e.g., L1, MAC (Medium Access Control), RLC (Radio Link Control) and PDCP (Packet Data Convergence Protocol)) to perform various signal processing. BB processor 826, instead of the controller 821 may include some or all of the logical functions described above. BB processor 826, a memory for storing a communication control program may be a module including a processor and associated circuitry to execute the program, the function of BB processor 826 may be changeable by the update of the program good. Further, the module may be a card or a blade is inserted into the slot of the base station apparatus 820, or may be a chip mounted on said card or the blade. On the other hand, RF circuit 827, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 810.
[0136]
　Wireless communication interface 825 includes a plurality of BB processor 826 as shown in FIG. 17, a plurality of BB processor 826 may, for example, correspond to a plurality of frequency bands eNB800 uses. The wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 17, a plurality of RF circuits 827 may correspond for example to a plurality of antenna elements. Although the wireless communication interface 825 in FIG. 17 shows an example including a plurality of BB processor 826 and a plurality of RF circuits 827, a wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827 But good.
[0137]
　In eNB800 shown in FIG. 17, one or more components (setting unit 151 and / or communication control unit 153) included in the control unit 150 described with reference to FIG. 7, are implemented in the wireless communication interface 825 it may be. Alternatively, at least some of these components may be implemented in the controller 821. As an example, ENB800 is part of a wireless communication interface 825 (e.g., BB processor 826) or the whole, and mounted / or module including a controller 821, even if the one or more components in the modules are mounted good. In this case, the module stores (in other words, a program for executing the operation of the one or more components to the processor) processor program for functioning as the one or more components, and the program may be an execution. As another example, a program for causing a processor as the one or more components are installed in ENB800, wireless communication interface 825 (e.g., BB processor 826) also and / or controller 821 executes the program good. As described above, ENB800 as a device comprising the one or more components may be the base station device 820 or the module is provided, a program for causing a processor as the one or more components are provided it may be. The readable recording medium recording the program may be provided.
[0138]
　Further, in eNB800 shown in FIG. 17, the radio communication unit 120 described with reference to FIG. 7, the wireless communication interface 825 (e.g., RF circuitry 827) may be implemented in. The antenna unit 110 may be implemented in the antenna 810. The network communication unit 130 may be implemented in the controller 821 and / or network interface 823. The storage unit 140 may be implemented in the memory 822.
[0139]
　　　(Second applied example)
　FIG. 18 is a block diagram showing a second exemplary configuration of an eNB of the technology according to the present disclosure may be applied. eNB830 has one or more antennas 840, the base station apparatus 850, and RRH860. Each antenna 840 and RRH860 may be connected to each other via a RF cable. The base station apparatus 850 and RRH860 may be connected to one another by high-speed line such as an optical fiber cable.
[0140]
　Each antenna 840, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by RRH860. eNB830 has a plurality of antennas 840 as shown in FIG. 18, a plurality of antennas 840, for example, may correspond to a plurality of frequency bands eNB830 uses. Although in FIG. 18 shows an example in which ENB830 has a plurality of antennas 840, ENB830 may have a single antenna 840.
[0141]
　The base station apparatus 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855 and connection interface 857. Controller 851, a memory 852 and a network interface 853 is similar to the controller 821, a memory 822 and a network interface 823 described with reference to FIG. 17.
[0142]
　Wireless communication interface 855 supports any of the cellular communication system such as LTE or LTE-Advanced, via the RRH860 and antenna 840 to provide wireless connectivity to terminals located in a sector corresponding to RRH860. Wireless communication interface 855 typically may include such BB processor 856. BB processor 856, except that it is connected to the RF circuitry 864 of RRH860 through the connection interface 857 is similar to the BB processor 826 described with reference to FIG. 17. Wireless communication interface 855 includes a plurality of BB processor 856 as shown in FIG. 18, a plurality of BB processor 856 may, for example, correspond to a plurality of frequency bands eNB830 uses. Although the wireless communication interface 855 in FIG. 18 shows an example including a plurality of BB processor 856, a wireless communication interface 855 may comprise a single BB processor 856.
[0143]
　Connection interface 857 is an interface for base station apparatus 850 (the radio communication interface 855) connected to the RRH860. Connection interface 857 may be a communication module for communicating with the high-speed line which connects the base station apparatus 850 (wireless communication interface 855) and RRH860.
[0144]
　Further, RRH860 comprises a connection interface 861 and a wireless communication interface 863.
[0145]
　Connection interface 861 is an interface for connecting to the base station apparatus 850 RRH860 (wireless communication interface 863). Connection interface 861 may be a communication module for communicating with the high-speed line.
[0146]
　Wireless communication interface 863 sends and receives radio signals via an antenna 840. Wireless communication interface 863 may typically include an RF circuit 864. RF circuit 864, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 840. Wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 18, a plurality of RF circuits 864 may correspond for example to a plurality of antenna elements. Although the wireless communication interface 863 in FIG. 18 shows an example including a plurality of RF circuits 864, a wireless communication interface 863 may comprise a single RF circuit 864.
[0147]
　In eNB830 shown in FIG. 18, one or more components (setting unit 151 and / or communication control unit 153) included in the control unit described with reference to FIG. 7, the wireless communication interface 855 and / or wireless communication it may be implemented in the interface 863. Alternatively, at least some of these components may be implemented in the controller 851. As an example, ENB830 is part of a wireless communication interface 855 (e.g., BB processor 856) or the whole, and mounted / or module including a controller 851, even if the one or more components in the modules are mounted good. In this case, the module stores (in other words, a program for executing the operation of the one or more components to the processor) processor program for functioning as the one or more components, and the program may be an execution. As another example, a program for causing a processor as the one or more components are installed in ENB830, wireless communication interface 855 (e.g., BB processor 856) also and / or controller 851 executes the program good. As described above, ENB830 as a device comprising the one or more components may be the base station device 850 or the module is provided, a program for causing a processor as the one or more components are provided it may be. The readable recording medium recording the program may be provided.
[0148]
　Further, in eNB830 shown in FIG. 18, for example, wireless communication unit 120 described with reference to FIG. 7, the wireless communication interface 863 (e.g., RF circuitry 864) may be implemented in. The antenna unit 110 may be implemented in the antenna 840. The network communication unit 130 may be implemented in the controller 851 and / or network interface 853. The storage unit 140 may be implemented in the memory 852.
[0149]
　　<6.2. Applications> about the terminal apparatus
　　　(first applied example)
　FIG. 19 is a block diagram showing an example of a schematic configuration of the smartphone 900 technology according to the present disclosure may be applied. Smartphone 900, processor 901, memory 902, storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, display device 910, a speaker 911, a wireless communication interface 912,1 one or more of the antenna switch 915 comprises one or more antennas 916, bus 917, battery 918 and the auxiliary controller 919.
[0150]
　The processor 901 may be, for example, a CPU or SoC (System on Chip), which controls the functions of the application layer and other layers of the smartphone 900. Memory 902 includes RAM and ROM, for storing programs and data executed by the processor 901. Storage 903 may include a storage medium such as a semiconductor memory or a hard disk. External connection interface 904 is an interface for connecting an external device such as a memory card or USB (Universal Serial Bus) device to a smart phone 900.
[0151]
　The camera 906 is, for example, an image pickup element such as CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image. Sensor 907 may include, for example, the positioning sensor, a gyro sensor, the sensor group, such as a geomagnetic sensor and an acceleration sensor. The microphone 908 converts a voice inputted to the smartphone 900 to the audio signal. Input device 909, for example, a touch sensor, a keypad for detecting a touch to the screen of the display device 910, a keyboard includes a button or switch, and accepts an operation or information input from a user. Display device 910 has a screen such as a liquid crystal display (LCD) or organic light emitting diode (OLED) display, and displays the output image of the smartphone 900. Speaker 911 converts the audio signal output from the smart phone 900 to the audio.
[0152]
　Wireless communication interface 912 supports any of the cellular communication system such as LTE or LTE-Advanced, which executes wireless communication. Wireless communication interface 912 typically may include such BB processor 913 and RF circuit 914. BB processor 913, for example, the encoding / decoding may be performed such as modulation / demodulation and multiplexing / demultiplexing, execute various signal processing for wireless communication. On the other hand, RF circuit 914, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 916. Wireless communication interface 912 may be a one-chip module that integrates BB processor 913 and RF circuit 914. Wireless communication interface 912 may include a plurality of BB processor 913 and a plurality of RF circuits 914 as shown in FIG. 19. Although the wireless communication interface 912 in FIG. 19 shows an example including a plurality of BB processor 913 and a plurality of RF circuits 914, a wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914 But good.
[0153]
　Further, the wireless communication interface 912, in addition to cellular communication systems, short-range wireless communication system, other types of wireless communication systems, such as the proximity wireless communication system or wireless LAN (Local Area Network) system may support, in this case, it may include a BB processor 913 and RF circuit 914 for each wireless communication system.
[0154]
　Each of the antenna switch 915, a plurality of circuits included in the wireless communication interface 912 (e.g., different circuits for wireless communication system) switches the connection destination of the antenna 916 between.
[0155]
　Each antenna 916, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by the wireless communication interface 912. Smartphone 900 may have a plurality of antennas 916 as shown in FIG. 19. Although in FIG. 19 shows an example where the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.
[0156]
　Moreover, the smartphone 900 may comprise an antenna 916 for each wireless communication system. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.
[0157]
　Bus 917, a processor 901, memory 902, storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, display device 910, a speaker 911, connects the wireless communication interface 912 and the auxiliary controller 919 to each other . Battery 918 via a power supply line partially indicated by broken lines in the figure, supplies power to each block of the smartphone 900 shown in FIG. 19. Auxiliary Controller 919, for example, in the sleep mode, to operate the required minimum functionality of the smartphone 900.
[0158]
　In the smartphone 900 shown in FIG. 19, one or more components (setting unit 241 and / or communication control unit 243) included in the control unit 240 described with reference to FIG. 8 is implemented in a wireless communication interface 912 it may be. Alternatively, at least some of these components may be implemented in the processor 901 or the auxiliary controller 919. As an example, a smart phone 900, a portion of the wireless communication interface 912 (e.g., BB processor 913) or the whole, equipped with a module containing the processor 901, and / or the auxiliary controller 919, the one or more components in the module There may be implemented. In this case, the module stores (in other words, a program for executing the operation of the one or more components to the processor) processor program for functioning as the one or more components, and the program may be an execution. As another example, a program for causing a processor as the one or more components are installed on the smartphone 900, a wireless communication interface 912 (e.g., BB processor 913), a processor 901, and / or auxiliary controller 919 is the program may be an execution. As described above, may be provided smart phone 900 or the module is a device provided with the one or more components, the program may be provided for causing a processor as the one or more components. The readable recording medium recording the program may be provided.
[0159]
　Further, in a smart phone 900 shown in FIG. 19, for example, wireless communication unit 220 described with reference to FIG. 8, the radio communication interface 912 (e.g., RF circuitry 914) may be implemented in. The antenna unit 210 may be implemented in the antenna 916. The storage unit 230 may be implemented in the memory 902.
[0160]
　　　(Second applied example)
　FIG. 20 is a block diagram showing an example of a schematic configuration of the car navigation device 920 technology according to the present disclosure may be applied. Car navigation device 920, processor 921, memory 922, GPS (Global Positioning System) module 924, sensor 925, data interface 926, content player 927, a storage medium interface 928, an input device 929, display device 930, a speaker 931, a wireless communication an interface 933,1 one or more of the antenna switch 936,1 or more antennas 937 and battery 938.
[0161]
　The processor 921 may be, for example, a CPU or SoC, controls the navigation functions and other functions of the car navigation device 920. Memory 922 includes RAM and ROM, for storing programs and data executed by the processor 921.
[0162]
　GPS module 924 uses the GPS signal received from the GPS satellites, measures the position of the car navigation device 920 (e.g., latitude, longitude and altitude). Sensor 925 is, for example, a gyro sensor may include sensors such as a geomagnetic sensor, and pressure sensor. Data interface 926 is connected to, for example, vehicle network 941 through a terminal (not shown), we obtain the data generated by the vehicle, such as vehicle speed data.
[0163]
　Content player 927, storage medium to be inserted into the storage medium interface 928 (e.g., CD or DVD) to reproduce the content stored in the. Input device 929 may, for example, a touch sensor for detecting a touch on the screen of the display device 930 includes a button or switch, and accepts an operation or information input from a user. Display device 930 has a screen such as an LCD or OLED display, and displays an image of content navigation function or reproducing. Speaker 931 outputs sound of content navigation function or reproducing.
[0164]
　Wireless communication interface 933 supports any of the cellular communication system such as LTE or LTE-Advanced, which executes wireless communication. Wireless communication interface 933 typically may include such BB processor 934 and RF circuit 935. BB processor 934, for example, the encoding / decoding may be performed such as modulation / demodulation and multiplexing / demultiplexing, execute various signal processing for wireless communication. On the other hand, RF circuit 935, a mixer may include such as filters and amplifiers, for transmitting and receiving radio signals via an antenna 937. Wireless communication interface 933 may be a one-chip module that integrates BB processor 934 and RF circuit 935. Wireless communication interface 933 may include a plurality of BB processor 934 and a plurality of RF circuits 935 as shown in FIG. 20. Although the wireless communication interface 933 in FIG. 20 shows an example including a plurality of BB processor 934 and a plurality of RF circuits 935, a wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935 But good.
[0165]
　Further, the wireless communication interface 933, in addition to cellular communication systems, short-range wireless communication system may support other types of wireless communication systems, such as the proximity wireless communication system or wireless LAN system, in that case, the radio it may include a BB processor 934 and RF circuit 935 for each communication mode.
[0166]
　Each of the antenna switch 936, a plurality of circuits included in the wireless communication interface 933 (e.g., different circuits for wireless communication system) switches the connection destination of the antenna 937 between.
[0167]
　Each antenna 937, a single or multiple antenna elements (e.g., a plurality of antenna elements of MIMO antennas) have, is used to send and receive radio signals by the wireless communication interface 933. Car navigation device 920 may have a plurality of antennas 937 as shown in FIG. 20. Although the car navigation system 920 in FIG. 20 shows an example having a plurality of antennas 937, car navigation device 920 may have a single antenna 937.
[0168]
　Furthermore, car navigation device 920 may comprise an antenna 937 for each wireless communication system. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.
[0169]
　Battery 938, via a feed line partially indicated by broken lines in the figure, supplies power to each block of the car navigation device 920 shown in FIG. 20. Further, the battery 938 accumulates electric power fed from the vehicle side.
[0170]
　In car navigation device 920 shown in FIG. 20, one or more components (setting unit 241 and / or communication control unit 243) included in the control unit 240 described with reference to FIG. 8, in a wireless communication interface 933 it may be implemented. Alternatively, at least some of these components may be implemented in the processor 921. As an example, a car navigation device 920, a portion of the wireless communication interface 933 (e.g., BB processor 934) equipped with a module that contains the or all and / or processor 921, the one or more components are mounted in the module it may be. In this case, the module stores (in other words, a program for executing the operation of the one or more components to the processor) processor program for functioning as the one or more components, and the program may be an execution. As another example, a program for causing a processor as the one or more components are installed on the car navigation device 920, a wireless communication interface 933 (e.g., BB processor 934) and / or processor 921 executing the program it may be. As described above, it may be a car navigation device 920 or the module is provided as an apparatus provided with the one or more components, be provided a program for causing a processor as the one or more components good. The readable recording medium recording the program may be provided.
[0171]
　Further, the car navigation apparatus 920 shown in FIG. 20, for example, wireless communication unit 220 described with reference to FIG. 8, the radio communication interface 933 (e.g., RF circuitry 935) may be implemented in. The antenna unit 210 may be implemented in the antenna 937. The storage unit 230 may be implemented in the memory 922.
[0172]
　Further, the technology according to the present disclosure includes one or more blocks of the car navigation device 920 described above, the vehicle network 941 may be implemented as an in-vehicle system (or vehicle) 940 that includes a vehicle-side module 942. Vehicle module 942, the vehicle speed, generates a vehicle data such as engine speed or failure information, and outputs the generated data to the vehicle network 941.
[0173]
　<< 7. Conclusion >>
　above with reference to FIGS. 1 to 20 have been described in detail an embodiment of the present disclosure. As explained above, the terminal device 200 according to the embodiment communicates with a base station 100 that communicate to form a beam, in comparison with the first uplink reference signal, and the first uplink reference signal frequency bandwidth of interest is narrow transmission period to transmit a short second uplink reference signal. Thus, the base station 100, while performing scheduling by obtaining the channel information of the entire bandwidth to operate on the basis of the first uplink reference signal, performing the beam tracking on the basis of the second uplink reference signal it is possible. Here, a frequency bandwidth second uplink reference signal is intended, since narrower than the total bandwidth base station 100 is operated, the uplink overhead can be reduced, enabling the implementation of efficient beam tracking to become.
[0174]
　Further, the base station 100 according to the embodiment communicates with terminal device 200 to form a beam, in comparison with the first uplink reference signal, and the first uplink reference signal from the terminal device 200 subject frequency bandwidth and performs the reception of the narrow transmission period is shorter second uplink reference signal, the transmission of the first setting information for the second uplink reference signal to the terminal apparatus 200. Thus, the terminal device 200, a second uplink reference signal it becomes possible to transmit with appropriate transmission settings, the implementation of efficient beam tracking is achieved.
[0175]
　Having described in detail preferred embodiments of the present disclosure with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such an example. It would be appreciated by those skilled in the art of the present disclosure, within the scope of the technical idea described in the claims, it is clear that to cover various modifications, combinations, for these It is also understood to belong to the technical scope of the present disclosure.
[0176]
　For example, the techniques described above may be appropriately combined. For example, UE 200 includes a configuration information from the eNB 100, based on both the reception result of the CSI-RS, may be performed SRS transmission setting of the type B.
[0177]
　Further, the processing in the present specification has been described with reference to flowcharts and sequence diagrams may not be performed in the order always shown. Some process steps may be executed in parallel. Also may be additional processing steps employed, some of the processing steps may be omitted.
[0178]
　The effects described herein are not limiting be those that only illustrative or exemplary. In other words, the technology according to the present disclosure, together with the above effects, or instead of the above effects, can exhibit the apparent other effects to those skilled in the art from the description herein.
[0179]
　Also within the scope of the present disclosure the following configurations.
(1)
　a communication unit which communicates with a base station that communicates by forming a beam,
　first uplink reference signal, and the transmission period of the first uplink reference signal frequency bandwidth of interest as compared to the narrow a control unit for transmitting a short second uplink reference signal
terminal device comprising a.
(2)
　a plurality of said second uplink reference signal is periodically transmitted in the same frequency position, the terminal apparatus according to (1).
(3)
　the second uplink reference signal is transmitted at 10 millisecond intervals from 5 msec, the terminal apparatus according to (2).
(4)
　the second uplink reference signal is used for beam tracking by the base station, wherein (1) to the terminal device according to any one of (3).
(5)
　the first uplink reference signal is directed to the whole communication is possible frequency bandwidth of the base station, the second uplink reference signal, the frequency band signals communicate with the base station target portion of the frequency bandwidth of the width, the (1) to the terminal device according to any one of (4).
(6)
　Wherein the control unit performs transmission setting for the first on the basis of the setting information of the second uplink reference signal received from the base station, according to any one of (1) to (5) of the terminal device.
(7)
　the control unit performs transmission setting for the second uplink reference signal based on the downlink reference signal received from the base station, any one of (1) to (5) terminal device according to.
(8)
　The control unit transmits while frequency hopping the second uplink reference signal in a frequency bandwidth with the target, wherein (1) the terminal device according to any one of (1) to (7) .
(9)
　the control unit transmits the second setting information relating to the frequency hopping to the base station, the terminal apparatus according to (8).
(10)
　wherein the control unit, each of the plurality of the second uplink reference signals are multiplexed using different frequency hopping patterns to each other, the terminal apparatus according to (8) or (9).
(11)
　and forms a beam communication unit that communicates with the terminal device,
　the first uplink reference signal from the terminal device, and the first frequency bandwidth of interest as compared to the uplink reference signal narrow and reception of the transmission cycle is shorter second uplink reference signal, a control unit for transmitting a first configuration information for the second uplink reference signal to the terminal device
the base station comprising a.
(12)
　The control unit transmits the first setting information corresponding to the reception result of the first uplink reference signal, the base station according to (11).
(13)
　the first configuration information, the second uplink reference signal includes information indicating the frequency location of frequency bandwidth of interest, the base station according to (12).
(14)
　the control unit, the frequency position of the frequency bandwidth in which the second uplink reference signal is intended, is set based on the reception result of the first uplink reference signal, in the (13) the base station according.
(15)
　the first setting information includes information indicating a transmission period of the second uplink reference signal, the (12) base station according to any one of - (14).
(16)
　wherein the control unit sets a plurality of frequency hopping patterns different from each other used for transmission of the second uplink reference signal, the (12) to the base station according to any one of (15) .
(17)
　and communicating with a base station that communicates by forming a beam,
　first uplink reference signal, and the first uplink reference signal and the transmission cycle frequency bandwidth is narrow of interest by comparing the and transmitting by the short second uplink reference signal processor
method comprising.
(18)
　And communicating with the terminal apparatus to form a beam,
　first uplink reference signal, and the first uplink reference signal and the transmission cycle frequency bandwidth is narrow in question compared from the terminal device short and receiving the second uplink reference signal, and be carried out by the processor transmission of the first setting information for the second uplink reference signal to the terminal device
method comprising.
(19)
　the computer,
　a communication unit that communicates with a base station that communicates by forming a beam,
　first uplink reference signal, and the first frequency bandwidth of interest as compared to the uplink reference signal a control unit for narrow transmission cycle to transmit a short second uplink reference signal
recording medium having a program recorded thereon for functioning as a.
(20)
　the computer,
　a communication unit which communicates with the terminal apparatus to form a beam,
　first uplink reference signal from the terminal device, and the frequency of interest as compared to said first uplink reference signal and receiving a bandwidth narrow transmission period shorter second uplink reference signal, a control unit for transmitting a first configuration information for the second uplink reference signal to the terminal device
function as recording medium on which a program is recorded for causing.
DESCRIPTION OF SYMBOLS
[0180]
　1 system
　100 Base station
　110 Antenna section
　120 Radio communication section
　130 network communication unit
　140 storage unit
　150 control unit
　151 setting unit
　153 communication control unit
　200 terminal apparatus
　210 antenna unit
　220 radio communication unit
　230 storage unit
　240 control unit
　241 setting unit
　243 Communication control unit

WE CLAIM

A communication unit that communicates with a base station that communicates by forming a beam,
　first the first uplink reference signal, and the first uplink reference signal and the transmission cycle frequency bandwidth is narrow of interest by comparing a short a control unit for transmitting a second uplink reference signal
terminal device comprising a.
[Requested item 2]
　The plurality of the second uplink reference signal is periodically transmitted in the same frequency position, the terminal device according to claim 1.
[Requested item 3]
　The second uplink reference signal is transmitted at 10 millisecond intervals from 5 msec, the terminal device according to claim 2.
[Requested item 4]
　The second uplink reference signal is used for beam tracking by the base station, the terminal apparatus according to claim 1.
[Requested item 5]
　First uplink reference signal is directed to the whole communication is possible frequency bandwidth of the base station, the second uplink reference signal among the communication available frequency bandwidth of the base station target portion of the frequency bandwidth, the terminal device according to claim 1.
[Requested item 6]
　Wherein the control unit performs transmission setting for the second uplink reference signal based on the first setting information received from the base station, the terminal apparatus according to claim 1.
[Requested item 7]
　Wherein, based on the downlink reference signal received from the base station performs transmission setting for the second uplink reference signal, the terminal device according to claim 1.
[Requested item 8]
　Wherein the control unit transmits while frequency hopping the second uplink reference signal in the frequency bandwidth and the target terminal device according to claim 1.
[Requested item 9]
　Wherein the control unit transmits the second setting information relating to the frequency hopping to the base station, the terminal apparatus according to claim 8.
[Requested item 10]
　Wherein, each of the plurality of the second uplink reference signals are multiplexed using different frequency hopping patterns to each other, the terminal apparatus according to claim 8.
[Requested item 11]
　A communication unit which communicates with the terminal apparatus to form a beam,
　first uplink reference signal, and the first uplink reference signal with a narrow transmission cycle frequency bandwidth of interest by comparing from the terminal device and the reception of the short second uplink reference signal, a control unit for transmitting a first configuration information for the second uplink reference signal to the terminal device
the base station comprising a.
[Requested item 12]
　Wherein the control unit transmits the first setting information corresponding to the reception result of the first uplink reference signal, the base station according to claim 11.
[Requested item 13]
　Wherein the first configuration information, the second uplink reference signal includes information indicating the frequency location of frequency bandwidth of interest, the base station according to claim 12.
[Requested item 14]
　Wherein the control unit, the frequency position of the frequency bandwidth in which the second uplink reference signal is intended, is set based on the reception result of the first uplink reference signal, the base station according to claim 13 .
[Requested item 15]
　The first setting information includes information indicating a transmission period of the second uplink reference signal, the base station of claim 12.
[Requested item 16]
　Wherein the control unit sets each other to different frequency hopping patterns used for transmission of the second uplink reference signal, the base station according to claim 12.
[Requested item 17]
　And communicating with a base station that communicates by forming a beam,
　first uplink reference signal, and the first uplink reference signal with a narrow transmission cycle frequency bandwidth of interest by comparing a short second and transmitting the uplink reference signal by the processor
method comprising.
[Requested item 18]
　And communicating with the terminal apparatus to form a beam,
　first uplink reference signal, and the first uplink reference signal and the transmission cycle frequency bandwidth is narrow in question compared from the terminal device short and receiving the second uplink reference signal, and be carried out by the processor transmission of the first setting information for the second uplink reference signal to the terminal device
method comprising.
[Requested item 19]
　Computer,
　and a communication unit that communicates with a base station that communicates by forming a beam,
　first uplink reference signal, and the first transmission period frequency bandwidth is narrow of interest as compared to the uplink reference signal a control unit for transmitting a short second uplink reference signal
recording medium having a program recorded thereon for functioning as a.
[Requested item 20]
　Computer,
　and a communication unit that communicates with the terminal apparatus to form a beam,
　first uplink reference signal from the terminal device, and the first frequency bandwidth of interest as compared to the uplink reference signal and receiving the narrow transmission period is shorter second uplink reference signal, and a control unit for transmitting a first configuration information for the second uplink reference signal to the terminal apparatus,
to function as recording medium in which the program is recorded.