Wireless device, communication method, and integrated circuit

Abstract

To provide a terminal which achieves appropriate radio communication with a transmission / reception point based on a first communication system in a situation where the first communication system and a second communication system coexist.SOLUTION: The terminal includes a communication section that performs radio communication with the plurality of transmission and reception points based on a first communication scheme, and a control section that determines a transmission and reception point to perform radio communication among the plurality of transmission and reception points based on detection of a signal of radio communication based on a second communication scheme.SELECTED DRAWING: Figure 51B

Description

[Technical Field]

[0001] The present disclosure relates to wireless devices, communication methods, and integrated circuits. [Background technology]

[0002] For example, a communication system using a 60 GHz band is an example of a system using frequencies above 52.6 GHz.

[0003] A communication method for increasing the communication distance is described in Patent Document 1. Figure 92 shows an example of the communication state of the wireless communication device described in Patent Document 1.

[0004] For example, the wireless communication device 001 transmits a sector sweep signal. Then, the wireless communication device 051 transmits a sector sweep signal. Then, the wireless communication device 051 transmits a signal including feedback information related to the sector sweep to the wireless communication device 001.

[0005] By following this procedure, the wireless communication device 001 determines the method of "transmit beamforming and / or receive beamforming," and the wireless communication device 051 also determines the method of "transmit beamforming and / or receive beamforming." This makes it possible to increase the communication distance between the wireless communication device 001 and the wireless communication device 051. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 2018-518855 Summary of the Invention

[0007] For example, wireless systems with different wireless communication methods, such as 5G (5th Generation) (cellular system) and IEEE (Institute of Electrical and Electronics Engineers) 802.11ad / ay, may share a "licensed band and / or an unlicensed band." In Patent Document 1, while beamforming can increase the communication distance, there remains the issue of building a mechanism that allows this communication system to coexist with "devices that use other wireless communication standards."

[0008] Non-limiting examples of the present disclosure contribute to providing a technology that enables a transmitting / receiving point based on a first communication method and a terminal to achieve suitable wireless communication in a situation where a first communication method and a second communication method coexist.

[0009] A terminal according to one embodiment of the present disclosure has a communication unit that performs wireless communication with a plurality of transmission / reception points based on a first communication method, and a control unit that determines, based on detection of a wireless communication signal based on a second communication method, one of the plurality of transmission / reception points with which to perform wireless communication.

[0010] A wireless system according to one embodiment of the present disclosure is a wireless system in which a first transmission / reception point and a second transmission / reception point cooperate to perform wireless communication with a terminal, and each of the first transmission / reception point and the second transmission / reception point has a communication unit that performs wireless communication with the terminal based on a first communication method, and a control unit that determines wireless communication with the terminal based on detection of a wireless communication signal based on the second communication method.

[0011] A communication method according to one embodiment of the present disclosure includes a terminal communicating wirelessly with a plurality of transmission / reception points based on a first communication method, and determining, based on detection of a wireless communication signal based on a second communication method, which of the plurality of transmission / reception points to communicate wirelessly with.

[0012] A communication method according to one embodiment of the present disclosure is a communication method for a wireless system in which a first transmission / reception point and a second transmission / reception point cooperate to perform wireless communication with a terminal, wherein each of the first transmission / reception point and the second transmission / reception point wirelessly communicates with the terminal based on a first communication method, and determines to perform wireless communication with the terminal based on detection of a wireless communication signal based on a second communication method.

[0013] These comprehensive or specific aspects may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0014] According to a non-limiting example of the present disclosure, in a situation where a first communication method and a second communication method coexist, a transmitting / receiving point based on the first communication method and a terminal can achieve suitable wireless communication.

[0015] Further advantages and benefits of certain aspects of the present disclosure will become apparent from the specification and drawings. Such advantages and / or benefits may be provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of them may be provided to obtain one or more identical features. [Brief explanation of the drawings]

[0016] [Figure 1A] FIG. 1 shows an example of the configuration of a communication device according to a first embodiment. [Figure 1B] FIG. 1B is a diagram showing an example of a configuration different from that shown in FIG. 1A of the communication device according to the first embodiment; [Figure 1C] FIG. 1B is a diagram showing an example of a configuration of a communication device according to a first embodiment, which is different from that shown in FIGS. 1A and 1B. [Figure 2] FIG. 10 shows an example of the configuration of an i-th transmission unit. [Figure 3] FIG. 1B is a diagram showing an example of the configuration of a transmitting panel antenna i in FIGS. 1A, 1B, and 1C. [Figure 4]FIG. 1B is a diagram showing an example of the configuration of a receiving panel antenna i in FIGS. 1A, 1B, and 1C. [Figure 5] FIG. 1 is a diagram showing an example of the configuration of a transmission device when an OFDM system is used. [Figure 6] FIG. 1 is a diagram showing an example of the configuration of a receiving device when an OFDM system is used; [Figure 7] FIG. 10 is a diagram showing an example of the configuration of a receiving device when using a single carrier method based on DFT. [Figure 8] FIG. 10 is a diagram illustrating an example of the configuration of a receiving device when a single carrier system based on the time domain is used. [Figure 9] FIG. 1 shows an example of a communication state in the first embodiment. [Figure 10] FIG. 10 is a diagram showing an example of a modulated signal transmitted by base station #1 in FIG. [Figure 11] FIG. 11 shows an example of a sector sweep reference signal in FIG. 10 transmitted by the base station #1 in FIG. 9 having the configurations in FIGS. 1A, 1B, and 1C. [Figure 12] A diagram showing an example of the configuration of the "sector sweep reference signal in the transmitting panel antenna i for frequency ♭p" in Figure 11. [Figure 13] FIG. 10 is a diagram showing an example of operation in the time interval from time t1 to t2, which is the terminal response interval. [Figure 14] FIG. 14 is a diagram showing an example of terminal occupation in the transmission interval of the "sector sweep reference signal" for the terminal shown in FIG. 13. [Figure 15A] A diagram showing an example of the configuration of a "sector sweep reference signal" for terminal #i. [Figure 15B] FIG. 15B is a diagram showing a configuration example of the “sector sweep reference signal in the transmitting panel antenna xi of the terminal #i” in FIG. 15A. [Figure 16A] FIG. 11 shows an example of the configuration of a feedback signal transmitted by base station #1 in the time interval from t2 to t3 in FIG. 10. [Figure 16B] FIG. 16B is a diagram showing an example of specific feedback signal assignment for the feedback signals shown in FIG. 16A. [Figure 17A]FIG. 11 shows an example of the configuration of a frame including a data symbol transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 10. [Figure 17B] FIG. 17B is a diagram showing an example of allocation of specific modulated signals (slots) to a frame including the data symbols shown in FIG. 17A. [Figure 18] FIG. 10 shows an example of a situation in which base station #1 and terminals #1 to #6 are communicating with each other. [Figure 19] 18 and subsequent figures showing examples of the transmission status of modulated signals from base station #1 and terminals such as "terminals #1 to #6"; [Figure 20A] FIG. 10 shows an example of the structure of a "frame including data symbols" transmitted by terminal #1. [Figure 20B] FIG. 10 shows an example of the structure of a "frame including data symbols" transmitted by terminal #2. [Figure 20C] FIG. 10 shows an example of the structure of a "frame including data symbols" transmitted by terminal #3. [Figure 20D] FIG. 10 shows an example of the structure of a "frame including data symbols" transmitted by terminal #4. [Figure 20E] FIG. 10 shows an example of the structure of a "frame including data symbols" transmitted by terminal #5. [Figure 20F] FIG. 10 shows an example of the structure of a "frame including data symbols" transmitted by terminal #6. [Figure 21] FIG. 11 shows an example of the configuration of a terminal response section from time t1 to time t2 in FIG. 10. [Figure 22A] A diagram showing an example of the time-frequency configuration of a "sector sweep reference signal" for a terminal [Figure 22B] A diagram showing an example of the time-frequency configuration of a "sector sweep reference signal" for a terminal [Figure 23A] FIG. 11 shows an example of the structure of a feedback signal transmitted by base station #1 in the time interval from t2 to t3 in FIG. 10. [Figure 23B] FIG. 23B is a diagram showing a specific example of assignment of feedback signals shown in FIG. 23A; [Figure 24A]FIG. 11 shows an example of the configuration of a frame including a data symbol transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 10. [Figure 24B] FIG. 24B is a diagram showing an example of allocation of frequency modulation signals (slots) in a frame including the data symbol shown in FIG. 24A. [Figure 25A] FIG. 10 is a diagram showing an example of the structure of a frame including data symbols transmitted by a terminal. [Figure 25B] FIG. 10 is a diagram showing an example of the structure of a frame including data symbols transmitted by a terminal. [Figure 25C] FIG. 10 is a diagram showing an example of the structure of a frame including data symbols transmitted by a terminal. [Figure 25D] FIG. 10 is a diagram showing an example of the structure of a frame including data symbols transmitted by a terminal. [Figure 25E] FIG. 10 is a diagram showing an example of the structure of a frame including data symbols transmitted by a terminal. [Figure 25F] FIG. 10 is a diagram showing an example of the structure of a frame including data symbols transmitted by a terminal. [Figure 26] FIG. 13 is a diagram showing an example of a communication state in the fifth embodiment. [Figure 27] FIG. 27 shows an example of a sector sweep reference signal of FIG. 10 transmitted by base station #1 of FIG. 26. [Figure 28] FIG. 28 shows an example of the configuration of the "sector sweep reference signal in transmitting panel antenna i" in FIG. 27. [Figure 29] FIG. 14 is a diagram showing an example of the occupation of the transmission interval of the "sector sweep reference signal for terminal" shown in FIG. 13. [Figure 30] A diagram showing an example of the configuration of the "sector sweep reference signal in the transmitting panel antenna" in FIG. 27. [Figure 31] FIG. 11 shows an example of the structure of a feedback signal transmitted by base station #1 in the time interval from t2 to t3 in FIG. 10. [Figure 32] FIG. 11 shows an example of the configuration of a frame including a data symbol transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 10. [Figure 33]A diagram showing an example of the structure of a "frame containing data symbols" transmitted by a terminal [Figure 34] A diagram showing an example of the configuration of a sector sweep reference signal [Figure 35] A diagram showing an example of the configuration of the "sector sweep reference signal of frequency ♭p" in Figure 34. [Figure 36] FIG. 15 shows an example of the configuration of the "sector sweep reference signal" of terminal #i in FIG. 14. [Figure 37] FIG. 30 shows an example of the configuration of a sector sweep reference signal in FIG. 29. [Figure 38] FIG. 13 is a diagram showing an example of a wireless system according to a fifth embodiment. [Figure 39A] Diagram showing an example of a multiple TRP system configuration [Figure 39B] Diagram showing an example of a multiple TRP system configuration [Figure 39C] Diagram showing an example of a multiple TRP system configuration [Figure 40] Diagram illustrating SDM or FDM of the modulated signal sent by NR-UE to TRP [Figure 41] Diagram illustrating SDM or FDM of the modulated signal sent by NR-UE to TRP [Figure 42] Diagram illustrating SDM or FDM of the modulated signal sent by NR-UE to TRP [Figure 43] Diagram illustrating SDM or FDM of the modulated signal sent by NR-UE to TRP [Figure 44] Diagram illustrating SDM or FDM of the modulated signal sent by NR-UE to TRP [Figure 45] Diagram illustrating SDM or FDM of the modulated signal sent by NR-UE to TRP [Figure 46] Diagram showing an example of the configuration of gNB and NR-UE [Figure 47] Diagram showing an example of the configuration of gNB and NR-UE [Figure 48] Flow diagram showing an example of gNB omni-directional LBT operation [Figure 49]Flow diagram showing an example of gNB directional LBT operation [Figure 50] Flow diagram showing an example of gNB directional LBT operation [Figure 51A] A diagram showing an example of communication status between a TRP and an NR-UE. [Figure 51B] A diagram showing an example of communication status between a TRP and an NR-UE. [Figure 52] A diagram showing an example of a communication section related to sector sweep. [Figure 53] FIG. 10 shows an example of an LBT implementation period and a modulated signal transmission period. [Figure 54] FIG. 10 shows an example of an LBT implementation period and a modulated signal transmission period. [Figure 55] A diagram showing an example of communication status between a TRP and an NR-UE. [Figure 56A] FIG. 51B is a diagram for explaining an example of operation when transitioning from FIG. 51A to FIG. 55 [Figure 56B] FIG. 51B is a diagram for explaining an example of operation when transitioning from FIG. 51A to FIG. 55 [Figure 57A] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 57B] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 58A] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 58B] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 59A] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 59B] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 60A] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 60B] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 61A] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 61B] A diagram showing an example of frequency bands in which NR-UE performs LBT. [Figure 62] A diagram showing an example of communication status between a TRP and an NR-UE. [Figure 63A] FIG. 62 is a diagram illustrating an example of an operation when transitioning from FIG. 51A to FIG. 62. [Figure 63B] FIG. 62 is a diagram illustrating an example of an operation when transitioning from FIG. 51A to FIG. 62. [Figure 64] A diagram showing an example of communication status between a TRP and an NR-UE. [Figure 65A] FIG. 62 is a diagram illustrating an example of the operation when transitioning from FIG. 62 to FIG. 64. [Figure 65B] FIG. 62 is a diagram illustrating an example of the operation when transitioning from FIG. 62 to FIG. 64. [Figure 66] A diagram showing an example of communication status between a TRP and an NR-UE. [Figure 67A] FIG. 51 is a diagram for explaining an example of operation when transitioning from FIG. 66 to FIG. [Figure 67B] FIG. 51 is a diagram for explaining an example of operation when transitioning from FIG. 66 to FIG. [Figure 68] A diagram showing an example of capability / capabilities information [Figure 69] FIG. 1 is a diagram showing an example of the relationship between the frequency bands of a first standard and the frequency bands of a second standard. [Figure 70A] A diagram showing an example of communication status between gNB and NR-UE [Figure 70B] A diagram showing an example of communication status between gNB and NR-UE [Figure 71] A diagram showing an example of a communication state between a gNB and an NR-UE and an example of a communication state between an AP and a UE. [Figure 72.1] Diagram explaining frequency usage examples [Figure 72.2] Diagram explaining frequency usage examples [Figure 72.3] Diagram explaining frequency usage examples [Figure 72.4] Diagram explaining frequency usage examples [Figure 72.5] Diagram explaining frequency usage examples [Figure 72.6] Diagram explaining frequency usage examples [Figure 72.7] Diagram explaining frequency usage examples [Figure 72.8] Diagram explaining frequency usage examples [Figure 72.9] Diagram explaining frequency usage examples [Figure 72.10] Diagram explaining frequency usage examples [Figure 72.11] Diagram explaining frequency usage examples [Figure 72.12] Diagram explaining frequency usage examples [Figure 72.13] Diagram explaining frequency usage examples [Figure 73] A diagram showing an example of a communication state between a gNB and an NR-UE and an example of a communication state between an AP and a UE. [Figure 74A] A diagram showing an example of the state of downlink FDM in multiple TRP [Figure 74B] A diagram showing an example of the state of downlink FDM in multiple TRP [Figure 74C] A diagram showing an example of the state of downlink FDM in multiple TRP [Fig. 74D] A diagram showing an example of the state of downlink FDM in multiple TRP [Figure 74E] A diagram showing an example of the state of downlink FDM in multiple TRP [Figure 74F] A diagram showing an example of the state of downlink FDM in multiple TRP [Figure 74G] A diagram showing an example of the state of downlink FDM in multiple TRP [Figure 74H] A diagram showing an example of the state of downlink FDM in multiple TRP [Figure 75] Diagram showing the frequency-time relationship when performing initial sensing [Figure 76] Diagram showing the frequency-time relationship when performing initial sensing [Figure 77] Diagram showing the frequency-time relationship when performing initial sensing [Figure 78] A diagram showing an example of a communication state between a gNB and an NR-UE and an example of a communication state between an AP and a UE. [Figure 79] A diagram showing an example of communication status between gNB and NR-UE [Figure 80] A diagram showing an example of a communication state between a gNB and an NR-UE and an example of a communication state between an AP and a UE. [Figure 81] A diagram showing an example of communication status between gNB and NR-UE [Figure 82] A diagram showing an example of communication status between gNB and NR-UE [Figure 83] FIG. 1 is a diagram showing an example of the relationship between channels of a first standard and channels of a second standard. [Figure 84] A diagram showing an example of a communication state between a gNB and an NR-UE and an example of a communication state between an AP and a UE. [Figure 85] A diagram showing an example of capability / capabilities information [Figure 86A] A diagram showing a variation of communication between a TRP and an NR-UE. [Figure 86B] A diagram showing a variation of communication between a TRP and an NR-UE. [Figure 86C] A diagram showing a variation of communication between a TRP and an NR-UE. [Figure 86D] A diagram showing a variation of communication between a TRP and an NR-UE. [Figure 86E] A diagram showing a variation of communication between a TRP and an NR-UE. [Figure 86F] A diagram showing a variation of communication between a TRP and an NR-UE. [Figure 87] A diagram showing an example of the TRP configuration [Figure 88A] Figure 1 shows an example of the configuration of an NR-UE [Figure 88B] Figure 1 shows an example of the configuration of an NR-UE [Figure 88C] Figure 1 shows an example of the configuration of an NR-UE [Figure 89] FIG. 10 illustrates an example of information included in a modulated signal transmitted by an NR-UE. [Figure 90] FIG. 10 is a diagram showing an example of information included in a modulated signal transmitted by a TRP. [Figure 91A] A diagram showing an example of communication between a TRP and an NR-UE. [Figure 91B] A diagram showing an example of communication between a TRP and an NR-UE. [Figure 92] FIG. 1 is a diagram showing an example of a communication state of a wireless communication device according to a conventional technique. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0018] First, in the first to fifth embodiments, a communication method using sector sweep will be described, and then a sensing method when using communication using sector sweep will be described.

[0019] (Embodiment 1)

[0020] In the first embodiment, a communication system, a communication device, and a communication method using sector sweep will be described.

[0021] FIG. 1A shows an example of the configuration of a communication device such as a base station, an access point, a terminal, a repeater, or a TRP (TRP: Tx (Transmission) / Rx (Reception) point) in the first embodiment.

[0022] 1A includes N transmission units, ie, "first transmission unit 102_1 to N-th transmission unit 102_N." Note that N is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0023] 1A is assumed to include M transmitting panel antennas for transmission, "transmitting panel antenna 1 106_1 to transmitting panel antenna M 106_M," where M is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0024] 1A includes n receiving units, "first receiving unit 155_1 to n-th receiving unit 155_n," where n is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0025] 1A is assumed to have m receiving panel antennas, i.e., "receiving panel antenna 1 151_1 to receiving panel antenna m 151_m," where m is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0026] The i-th transmitter 102_i receives the control signal 100 and the i-th data 101_i as input, performs error correction coding, mapping according to a modulation method, and the like, and outputs the i-th modulated signal 103_i, where i is an integer between 1 and N.

[0027] The i-th data 101_i may include data of one or more users, and in this case, an error correction code, modulation method, and transmission method may be set for each user.

[0028] The first processing unit 104 receives the ith modulated signal 103_i (i is an integer greater than or equal to 1 and less than or equal to N), the control signal 100, and the reference signal 199 as input, and outputs the jth transmission signal 105_j (j is an integer greater than or equal to 1 and less than or equal to M) based on frame configuration information included in the control signal 100. Note that the ith modulated signal 103_i may contain no signal, and the jth transmission signal 105_j may contain no signal.

[0029] The j-th transmission signal 105_j is then output as a radio wave from a transmission panel antenna j of 106_j. Note that the transmission panel antenna j of 106_j may receive a control signal 100 as input, perform beamforming, and change the transmission directivity. Furthermore, the control signal 100 may be used to switch the transmission panel antenna j of 106_j when transmitting a modulated signal to a communication partner. This point will be described later.

[0030] The i-th reception signal 152_i is received by the i-th reception panel antenna 151_i. The i-th reception panel antenna 151_i may receive the control signal 100, perform beamforming, and change the reception directivity. This will be described later.

[0031] Second processing unit 153 receives ith received signal 152_i and control signal 100, performs processing such as frequency conversion, and outputs jth signal-processed signal 154_j. Note that it is possible for the ith received signal 152_i to contain no signal, and it is also possible for the jth signal-processed signal 154_j to contain no signal.

[0032] The jth receiving unit 155_j receives the jth signal processed signal 154_j and the control signal 100 as input, and performs processes such as demodulation and error correction decoding on the jth signal processed signal 154_j based on the control signal 100, and outputs the jth control data 156_j and the jth data 157_j.

[0033] The j-th control data 156_j may include control data of one or more users, and the j-th data 157_j may include data of one or more users.

[0034] Third processing unit 158 ​​receives j-th control data 156_j as input, generates and outputs control signal 100 based on information obtained from the communication partner, etc.

[0035] 1A may perform processing for transmit beamforming (transmit directivity control), for example, precoding processing. Furthermore, the second processing unit 153 may perform processing for receive directivity control. As another example, the first processing unit 104 may perform processing such as converting the first transmission signal 105_1 into the first modulated signal 103_1, the second transmission signal 105_2 into the second modulated signal 103_2, and the third transmission signal 105_3 into the third modulated signal 103_3, and outputting them. Alternatively, the first processing unit 104 may perform processing such as converting the first transmission signal 105_1 into the second modulated signal 103_2, and outputting them. Furthermore, the second processing unit 153 may perform processing such that the signal 154_1 after the first signal processing is output as the first received signal 152_1, the signal 154_2 after the second signal processing is output as the second received signal 152_2, and the signal 154_3 after the third signal processing is output as the third received signal 152_3. Alternatively, the second processing unit 153 may perform processing such that the signal 154_2 after the second signal processing is output as the first received signal 152_1.

[0036] 1A may be configured to include additional processing units not shown in FIG. 1A. For example, the communication device may include an interleaver for rearranging symbols and / or data, a padding unit for padding, and the like. Furthermore, the communication device of FIG. 1A (and FIGS. 1B and 1C) may perform transmission and / or reception corresponding to MIMO (Multiple Input Multiple Output) transmission in which multiple modulated signals (multiple streams) are transmitted using multiple antennas. Furthermore, the communication device of FIG. 1A (and FIGS. 1B and 1C) may perform transmission corresponding to multi-user MIMO transmission in which modulated signals are transmitted to multiple terminals in at least a first time interval using a first frequency (band).

[0037] Fig. 1B shows a configuration example of a communication device, such as a base station, an access point, a terminal, a repeater, or a TRP, in the present embodiment 1, which is different from Fig. 1A. In Fig. 1B, the same reference numerals are used to designate components that operate in the same manner as in Fig. 1A, and detailed description thereof will be omitted.

[0038] 1B is characterized in that the number of transmitters is the same as the number of transmitting panel antennas. In this case, the first processing unit 104 may perform processing for transmit beamforming (transmit directivity control), such as precoding. The first processing unit 104 may also convert the xth transmit signal 105_x into the yth modulated signal 103_y and output it. Note that x is an integer greater than or equal to 1 and less than or equal to M, and y is an integer greater than or equal to 1 and less than or equal to M.

[0039] The number of receiving units is assumed to be the same as the number of receiving panel antennas. In this case, second processing unit 153 may perform processing for receiving directivity control. Second processing unit 153 may also output signal 154_x after the xth signal processing as yth received signal 152_y. Note that x is an integer greater than or equal to 1 and less than or equal to m, and y is an integer greater than or equal to 1 and less than or equal to m.

[0040] Fig. 1C shows an example of a configuration different from Fig. 1A and Fig. 1B of a communication device such as a base station, an access point, a terminal, a repeater, or a TRP in the present embodiment 1. In Fig. 1C, the same numbers are used for components that operate in the same way as in Fig. 1A, and detailed description thereof will be omitted.

[0041] The characteristic feature of Figure 1C is that the number of transmitters is the same as the number of transmitting panel antennas, and there is no first processing unit. Also, the number of receivers is the same as the number of receiving panel antennas, and there is no second processing unit.

[0042] 1A, 1B, and 1C are examples of the configuration of communication devices such as base stations, access points, terminals, repeaters, and TRPs, and the method of configuring the communication devices is not limited to these examples.

[0043] 2 shows an example of the configuration of the i-th transmission unit 102_i, where i is an integer greater than or equal to 1 and less than or equal to N, or an integer greater than or equal to 1 and less than or equal to M. Data symbol generation unit 202 receives data 201 and control signal 200 as input, and performs error correction coding, mapping, signal processing for transmission, etc. based on information such as error correction coding method information, modulation method information, transmission method information, and frame configuration method included in control signal 200, and outputs data symbol modulated signal 203. Note that data 201 corresponds to the ith data 101_i, and control signal 200 corresponds to control signal 100. Therefore, data 201 may include data of one or more users.

[0044] The sector sweep reference signal generator 204 receives the control signal 200 as input, and generates and outputs the sector sweep reference signal 205 based on the frame configuration information included in the control signal 200. The specific configuration and transmission methods of the sector sweep reference signal 205 will be described in detail later.

[0045] The other signal generating unit 206 receives the control signal 200 as an input, generates the other signal 207 based on the control signal, and outputs it.

[0046] Processing unit 251 receives data symbol modulated signal 203, sector sweep reference signal 205, other signals 207, and control signal 200 as input, and generates and outputs modulated signal 252 conforming to the frame configuration based on frame configuration information included in control signal 200. Note that modulated signal 252 conforming to the frame configuration corresponds to i-th modulated signal 103_i. Specific examples of frame configurations will be described in detail later.

[0047] 3 shows an example of the configuration of the i-th transmitting panel antenna 106_i in FIGS. 1A, 1B, and 1C. Here, i is assumed to be "an integer equal to or greater than 1 and equal to or less than M." The distributor 302 receives a transmission signal 301 as input, distributes the signal, and outputs a first transmission signal 303_1, a second transmission signal 303_2, a third transmission signal 303_3, and a fourth transmission signal 303_4. Here, the transmission signal 301 corresponds to the "i-th transmission signal 105_i in FIGS. 1A and 1B" or the "i-th modulated signal 103_i in FIG. 1C."

[0048] Multiplication unit 304_1 receives first transmission signal 303_1 and control signal 300 as input, multiplies first transmission signal 303_1 by a multiplication coefficient based on control signal 300, generates coefficient-multiplied first transmission signal 305_1, and outputs it. Then, coefficient-multiplied first transmission signal 305_1 is output as a radio wave from antenna 306_1. Note that control signal 300 corresponds to control signal 100.

[0049] A more specific explanation will be given. The first transmission signal 303_1 is represented as tx1(t). Here, t is time. If the multiplication coefficient is w1, the first transmission signal 305_1 after the coefficient multiplication can be represented as tx1(t)×w1. Note that tx1(t) can be represented by a complex number and therefore may be a real number. Furthermore, w1 can be represented by a complex number and therefore may be a real number.

[0050] The multiplication unit 304_2 receives the second transmission signal 303_2 and the control signal 300 as input, multiplies the second transmission signal 303_2 by a multiplication coefficient based on the control signal 300, generates and outputs the coefficient-multiplied second transmission signal 305_2, and outputs the coefficient-multiplied second transmission signal 305_2 as a radio wave from the antenna 306_2.

[0051] A more specific explanation will be given. The second transmission signal 303_2 is represented as tx2(t). Here, t is time. If the multiplication coefficient is w2, the second transmission signal 305_2 after the coefficient multiplication can be represented as tx2(t)×w2. Note that tx2(t) can be represented by a complex number, and therefore may be a real number. Furthermore, w2 can be represented by a complex number, and therefore may be a real number.

[0052] The multiplication unit 304_3 receives the third transmission signal 303_3 and the control signal 300 as input, multiplies the third transmission signal 303_3 by a multiplication coefficient based on the control signal 300, generates and outputs a coefficient-multiplied third transmission signal 305_3, and outputs the coefficient-multiplied third transmission signal 305_3 as a radio wave from the antenna 306_3.

[0053] A more specific explanation will be given. The third transmission signal 303_3 is represented as tx3(t). Here, t is time. If the multiplication coefficient is w3, the third transmission signal 305_3 after the coefficient multiplication can be represented as tx3(t)×w3. Note that tx3(t) can be represented by a complex number, and therefore may be a real number. Furthermore, w3 can be represented by a complex number, and therefore may be a real number.

[0054] The multiplier 304_4 receives the fourth transmission signal 303_4 and the control signal 300 as input, multiplies the fourth transmission signal 303_4 by a multiplication coefficient based on the control signal 300, generates and outputs a coefficient-multiplied fourth transmission signal 305_4, and outputs the coefficient-multiplied fourth transmission signal 305_4 as a radio wave from the antenna 306_4.

[0055] A more specific explanation will be given. The fourth transmission signal 303_4 is represented as tx4(t). Here, t is time. If the multiplication coefficient is w4, the fourth transmission signal 305_4 after the coefficient multiplication can be represented as tx4(t)×w4. Note that tx4(t) can be represented by a complex number and therefore may be a real number. Furthermore, w4 can be represented by a complex number and therefore may be a real number.

[0056] It should be noted that "the absolute value of w1, the absolute value of w2, the absolute value of w3, and the absolute value of w4 may be equal." In this case, it is equivalent to a phase change. Naturally, the absolute values ​​of w1, w2, w3, and w4 do not have to be equal.

[0057] The values ​​of w1, w2, w3, and w4 may be switched for each frame, for each slot, for each minislot, for each set of symbols, or for each symbol. The timing for switching the values ​​of w1, w2, w3, and w4 is not limited to the above example.

[0058] Furthermore, the transmitting panel antenna in Figure 3 is described as being composed of four antennas (and four multiplication units), but the number of antennas is not limited to four, and it may be composed of two or more antennas.

[0059] In addition, the transmitting panel antenna i of 106_i in Figures 1A, 1B, and 1C may perform directivity control by changing the characteristics of the antenna itself, and in this case, the transmitting panel antenna i of 106_i may be composed of one or more antennas.

[0060] Fig. 4 shows an example of the configuration of the receiving panel antenna i of 151_i in Fig. 1A, Fig. 1B, and Fig. 1C, where i is an integer equal to or greater than 1 and equal to or less than m.

[0061] The multiplier 403_1 receives as input a first received signal 402_1 received by the antenna 401_1 and a control signal 400, multiplies the first received signal 402_1 by a multiplication coefficient based on the control signal 400, and outputs a first received signal 404_1 after the coefficient multiplication.

[0062] A more specific explanation will be given. The first received signal 402_1 is represented as rx1(t), where t is time. If the multiplication coefficient is d1, the first received signal 404_1 after the coefficient multiplication can be represented as rx1(t)×d1. Note that rx1(t) can be represented by a complex number and therefore may be a real number. Furthermore, d1 can be represented by a complex number and therefore may be a real number.

[0063] The multiplier 403_2 receives the second received signal 402_2 received by the antenna 401_2 and the control signal 400 as input, multiplies the second received signal 402_2 by a multiplication coefficient based on the control signal 400, and outputs the second received signal 404_2 after the coefficient multiplication.

[0064] A more specific explanation will be given. The second received signal 402_2 is represented as rx2(t), where t is time. If the multiplication coefficient is d2, the second received signal 404_2 after the coefficient multiplication can be represented as rx2(t)×d2. Note that rx2(t) can be represented by a complex number and therefore may be a real number. Furthermore, d2 can be represented by a complex number and therefore may be a real number.

[0065] The multiplier 403_3 receives the third received signal 402_3 received by the antenna 401_3 and the control signal 400 as input, multiplies the third received signal 402_3 by a multiplication coefficient based on the control signal 400, and outputs the third received signal 404_3 after the coefficient multiplication.

[0066] A more specific explanation will be given. The third received signal 402_3 is represented as rx3(t), where t is time. If the multiplication coefficient is d3, the third received signal 404_3 after the coefficient multiplication can be represented as rx3(t)×d3. Note that rx3(t) can be represented by a complex number and therefore may be a real number. Furthermore, d3 can be represented by a complex number and therefore may be a real number.

[0067] The multiplication unit 403_4 receives as input a fourth received signal 402_4 received by the antenna 401_4 and the control signal 400, multiplies the fourth received signal 402_4 by a multiplication coefficient based on the control signal 400, and outputs a fourth received signal 404_4 after the coefficient multiplication.

[0068] A more specific explanation will be given. The fourth received signal 402_4 is represented as rx4(t), where t is time. If the multiplication coefficient is d4, the fourth received signal 404_4 after the coefficient multiplication can be represented as rx4(t)×d4. Note that rx4(t) can be represented by a complex number and therefore may be a real number. Also, d4 can be represented by a complex number and therefore may be a real number.

[0069] The coupling / combining unit 405 receives as input the coefficient-multiplied first received signal 404_1, the coefficient-multiplied second received signal 404_2, the coefficient-multiplied third received signal 404_3, and the coefficient-multiplied fourth received signal 404_4, combines the coefficient-multiplied first received signal 404_1, the coefficient-multiplied second received signal 404_2, the coefficient-multiplied third received signal 404_3, and the coefficient-multiplied fourth received signal 404_4, and outputs a modulated signal 406. The modulated signal 406 is expressed as rx1(t)×d1+rx2(t)×d2+rx3(t)×d3+rx4(t)×d4.

[0070] Control signal 400 corresponds to control signal 100. Modulated signal 406 corresponds to the i-th received signal of 152_i.

[0071] Furthermore, the absolute values ​​of d1, d2, d3, and d4 may be equal to each other. This corresponds to a phase change. Naturally, the absolute values ​​of d1, d2, d3, and d4 do not have to be equal to each other.

[0072] The values ​​of d1, d2, d3, and d4 may be switched for each frame, for each slot, for each minislot, for each set of symbols, or for each symbol. The timing of switching the values ​​of d1, d2, d3, and d4 is not limited to the above example.

[0073] Furthermore, the receiving panel antenna in Figure 4 is described as being composed of four antennas (and four multiplication units), but the number of antennas is not limited to four, and it may be composed of two or more antennas.

[0074] In addition, the receiving panel antenna i of 151_i in Figures 1A, 1B, and 1C may perform directivity control by changing the characteristics of the antenna itself, and in this case, the receiving panel antenna i of 151_i may be composed of one or more antennas.

[0075] In this embodiment, in the case of communication devices such as a base station, a gNB (g Node B), and a terminal shown in Figures 1A, 1B, and 1C, it is assumed that they support multicarrier transmission such as an OFDM (Orthogonal Frequency Division Multiplexing) transmission method. Also, the base stations, gNBs, and terminals shown in Figures 1A, 1B, and 1C may support OFDMA (Orthogonal Frequency Division Multiple Access).

[0076] Fig. 5 shows an example of the configuration of a transmission device when using the OFDM system. As shown in Fig. 5, the transmission device is configured with, for example, a constellation mapper 501, a serial-to-parallel conversion unit 502, and an IFFT (Inverse Fast Fourier Transform) 503.

[0077] Constellation mapper 501 receives, for example, data as input, performs mapping based on a set modulation method, and outputs a modulated signal.

[0078] The serial-to-parallel converter 502 converts a serial signal into a parallel signal. If a parallel signal is already obtained, the serial-to-parallel converter 502 does not need to be provided.

[0079] The IFFT 503 performs IFFT processing on the input signal and outputs a modulated signal based on the OFDM system. Note that the IFFT 503 may be an inverse Fourier transform unit that performs inverse Fourier transform.

[0080] When using the OFDM system, the transmitting device may include other processing units, such as an error correction coding unit and an interleaver, and is not limited to the configuration shown in FIG.

[0081] In the present embodiment, in the case of a communication device such as a base station, a gNB, or a terminal, the communication devices shown in Figures 1A, 1B, and 1C may correspond to reception of multicarrier transmission such as an OFDM transmission method, or may correspond to reception of a single carrier method such as a single carrier method based on DFT (Discrete Fourier Transform). An example of the configuration of the reception part of a single carrier method will be described below.

[0082] Fig. 6 shows an example of the configuration of a receiving device when using the OFDM system. As shown in Fig. 6, a receiving device when using the OFDM system is configured with a receiving FE processing unit (Rx (Receiver) FE (Front End) processing) 601, an FFT (Fast Fourier Transform) 602, a parallel-serial conversion unit 603, and a demapper 604.

[0083] A receive FE processing unit (Rx FE processing) 601 performs receive front-end processing.

[0084] The FFT 602 performs FFT processing on the input signal.

[0085] The parallel-serial conversion unit 603 converts a parallel signal into a serial signal. Note that if a serial signal is already obtained, the parallel-serial conversion unit 603 does not need to be present.

[0086] The demapper 604 performs demodulation processing based on the transmission method and modulation scheme.

[0087] The receiving device may also include other processing units, such as a deinterleaver and a decoding unit for error correction codes, and is not limited to the configuration shown in FIG.

[0088] Fig. 7 shows an example of the configuration of a receiving device when using a single carrier scheme based on DFT. As shown in Fig. 7, the receiving device is made up of a receiving FE processing unit (Rx (Receiver) FE processing) 701, a CP removal unit (CP Removal) 702, an FFT (Fast Fourier Transform) 703, a tone demapping unit (Tone demapping) 704, an FDE (Frequency Domain Equalization) 705, a DFT 706, and a demapper 707. Note that other processing units may also be present in the receiving device.

[0089] Fig. 8 shows an example of the configuration of a receiving device when using a single carrier scheme based on the time domain. As shown in Fig. 8, the receiving device is made up of a receiving FE processing unit (Rx (Receiver) FE processing) 801, down-sampling and match filtering 802, time domain equalization (TDE) 803, CP removal unit (CP Removal) 804, and demapper 805. Note that other processing units may also be present in the receiving device.

[0090] Although examples of a receiving method and a receiving device configuration for a single carrier system have been described above, examples of the receiving method and the receiving device for a single carrier system are not limited to these. For example, examples of single carrier systems include "DFT (Discrete Fourier Transform)-Spread OFDM (Orthogonal Frequency Division Multiplexing)" (DFT-S OFDM), "Trajectory Constrained DFT-Spread OFDM", "Constrained DFT-Spread OFDM" (Constrained DFT-S OFDM), "OFDM based SC (Single Carrier)", "SC (Single Carrier)-FDMA (Frequency Division Multiple Access)", "Guard interval DFT-Spread OFDM", and a time-domain implementation single carrier system (e.g., SC (Single Carrier)-QAM).

[0091] Fig. 9 shows an example of a communication state in the first embodiment. As shown in Fig. 9, a case is considered in which a base station #1 of 901_1 communicates with a terminal #1 of 902_1, a terminal #2 of 902_2, a terminal #3 of 902_3, a terminal #4 of 902_4, a terminal #5 of 902_5, and a terminal #6 of 902_6. However, the relationship between the base station and the terminals is not limited to this example, and for example, a base station may communicate with one or more terminals.

[0092] In the following, an example will be described in which a base station uses OFDMA to transmit modulated signals to terminals.

[0093] Fig. 10 shows an example of a modulated signal 1000 transmitted by base station #1 901_1 in Fig. 9. In Fig. 10, the horizontal axis represents time and the vertical axis represents frequency. A sector sweep reference signal 1001 exists in the time interval from time t0 to t1. The sector sweep reference signal 1001 will be explained later.

[0094] The time period from time t1 to time t2 is a terminal response period. The terminal response will be explained later.

[0095] In the time period from time t2 to time t3, there is a feedback signal 1002. The feedback signal 1002 will be explained later.

[0096] In the time interval from time t4 to time t5, there is a frame 1003 including a data symbol. Note that the frame 1003 including a data symbol will be explained later.

[0097] 10, the signal is called a sector sweep reference signal 1001, but the name is not limited to this and may be called a reference signal, reference symbol, training signal, training symbol, reference signal, reference symbol, etc. Also, the signal is called a feedback signal 1002, but the name is not limited to this and may be called a feedback symbol, a signal addressed to a terminal, a symbol addressed to a terminal, a control signal, a control symbol, etc. And, the signal is called a frame 1003 including a data symbol, but the name is not limited to this and may be called a frame including a slot, minislot, unit, etc.

[0098] FIG. 11 shows an example of a sector sweep reference signal 1001 in FIG. 10 transmitted by base station #1 901_1 in FIG. 9 having the configurations of FIGS. 1A, 1B, and 1C. In FIG. 11, the horizontal axis represents time and the vertical axis represents frequency. In the example of FIG. 11, base station #1 901_1 transmits a modulated signal based on OFDMA, and therefore, as shown in FIG. 11, the frequency band is divided into frequency bands ♭1, ♭2, . . . , and ♭K. K is an integer equal to or greater than 1, or an integer equal to or greater than 2. For example, when OFDM(A) is used, one frequency band includes one or more (sub)carriers, or includes two or more (sub)carriers. This point may be the same in other drawings and other embodiments.

[0099] For example, in frequency band ♭1, there is a sector sweep reference signal 1101_11 for transmitting panel antenna 1 for frequency ♭1 in the first time interval, a sector sweep reference signal 1101_12 for transmitting panel antenna 2 for frequency ♭1 in the second time interval, ..., and a sector sweep reference signal 1101_1M for transmitting panel antenna M for frequency ♭1 in the Mth time interval.

[0100] Therefore, in frequency band ♭i, there is a sector sweep reference signal 1101_i1 for transmitting panel antenna 1 for frequency ♭i in the first time interval, a sector sweep reference signal 1101_i2 for transmitting panel antenna 2 for frequency ♭i in the second time interval, ..., a sector sweep reference signal 1101_iM for transmitting panel antenna M for frequency ♭i in the Mth time interval, where i is an integer between 1 and K.

[0101] Note that sector sweep reference signal 1101_ij for transmitting panel antenna j for frequency ♭i is transmitted from transmitting panel antenna j of 106_j of base station #1 901_1 having the configurations shown in Figures 1A, 1B, and 1C, where j is an integer between 1 and M.

[0102] One feature of this method is that in Figure 11, in the i-th time period, the sector sweep reference signal is transmitted from the same transmitting panel antenna regardless of the frequency band. In this case, in the first time period, the same beamforming parameters are used regardless of the frequency band. Beamforming will be explained later.

[0103] Fig. 12 shows an example of the configuration of the "sector sweep reference signal 1101_pi in the transmitting panel antenna i for frequency ♭p" in Fig. 11. In Fig. 12, the horizontal axis represents time. Note that p is an integer between 1 and K, and i is an integer between 1 and M.

[0104] For example, it is assumed that the base station #1 901_1 having the configurations of FIGS. 1A, 1B, and 1C has the configuration of FIG. 3 as the transmitting panel antenna i of 106_i.

[0105] The "reference signal 1201_1 based on the first parameter in the transmitting panel antenna i for frequency ♭p" will be described.

[0106] When base station #1 of 901_1 transmits "reference signal 1201_1 based on the first parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_1 at transmitting panel antenna i for 106_i to w1(i,1). If first transmission signal 303_1 in "reference signal 1201_1 based on the first parameter at transmitting panel antenna i for frequency ♭p" is tx1ref1(t), multiplier 304_1 obtains tx1ref1(t)×w1(i,1). Then, base station #1 of 901_1 transmits tx1ref1(t)×w1(i,1) from antenna 306_1 of FIG. 3, where t is time.

[0107] When base station #1 of 901_1 transmits "reference signal 1201_1 based on the first parameter at transmitting panel antenna i for frequency ♭p" shown in Fig. 12, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_2 at transmitting panel antenna i of 106_i to w2(i,1). If second transmission signal 303_2 in "reference signal 1201_1 based on the first parameter at transmitting panel antenna i for frequency ♭p" is tx2ref1(t), multiplier 304_2 obtains tx2ref1(t) × w2(i,1). Then, base station #1 of 901_1 transmits tx2ref1(t) × w2(i,1) from antenna 306_2 of Fig. 3.

[0108] When base station #1 of 901_1 transmits "reference signal 1201_1 based on the first parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_3 at transmitting panel antenna i for 106_i to w3(i,1). If third transmission signal 303_3 in "reference signal 1201_1 based on the first parameter at transmitting panel antenna i for frequency ♭p" is tx3ref1(t), multiplier 304_3 obtains tx3ref1(t)×w3(i,1). Then, base station #1 of 901_1 transmits tx3ref1(t)×w3(i,1) from antenna 306_3 of FIG. 3.

[0109] When base station #1 of 901_1 transmits "reference signal 1201_1 based on the first parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_4 at transmitting panel antenna i of 106_i to w4(i,1). If fourth transmission signal 303_4 in "reference signal 1201_1 based on the first parameter at transmitting panel antenna i for frequency ♭p" is tx4ref1(t), multiplier 304_4 obtains tx4ref1(t)×w4(i,1). Then, base station #1 of 901_1 transmits tx4ref1(t)×w4(i,1) from antenna 306_4 of FIG. 3.

[0110] The "reference signal 1201_j based on the j-th parameter in the transmitting panel antenna i for frequency ♭p" will be described.

[0111] When base station #1 of 901_1 transmits "reference signal 1201_j by the j-th parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_1 at transmitting panel antenna i of 106_i to w1(i,j). If first transmission signal 303_1 in "reference signal 1201_j by the j-th parameter at transmitting panel antenna i for frequency ♭p" is tx1refj(t), multiplier 304_1 obtains tx1refj(t)×w1(i,j). Then, base station #1 of 901_1 transmits tx1refj(t)×w1(i,j) from antenna 306_1 of FIG. 3, where t is time.

[0112] When base station #1 of 901_1 transmits "reference signal 1201_j by the j-th parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_2 at transmitting panel antenna i of 106_i to w2(i,j). If second transmission signal 303_2 in "reference signal 1201_j by the j-th parameter at transmitting panel antenna i for frequency ♭p" is tx2refj(t), multiplier 304_2 obtains tx2refj(t)×w2(i,j). Then, base station #1 of 901_1 transmits tx2refj(t)×w2(i,j) from antenna 306_2 of FIG. 3.

[0113] When base station #1 of 901_1 transmits "reference signal 1201_j by the j-th parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_3 at transmitting panel antenna i of 106_i to w3(i,j). If third transmission signal 303_3 in "reference signal 1201_j by the j-th parameter at transmitting panel antenna i for frequency ♭p" is tx3refj(t), multiplier 304_3 obtains tx3refj(t)×w3(i,j). Then, base station #1 of 901_1 transmits tx3refj(t)×w3(i,j) from antenna 306_3 of FIG. 3.

[0114] When base station #1 of 901_1 transmits "reference signal 1201_j by the j-th parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_4 at transmitting panel antenna i of 106_i to w4(i,j). If fourth transmission signal 303_4 in "reference signal 1201_j by the j-th parameter at transmitting panel antenna i for frequency ♭p" is tx4refj(t), multiplier 304_4 obtains tx4refj(t)×w4(i,j). Then, base station #1 of 901_1 transmits tx4refj(t)×w4(i,j) from antenna 306_4 of FIG. 3.

[0115] In the case of Fig. 12, j is an integer greater than or equal to 1 and less than or equal to 4. In Fig. 12, the number of parameter changes Z is set to Z=4, but the number of parameter changes Z is not limited to 4, and can be implemented in the same way as long as Z is an integer greater than or equal to 1 or an integer greater than or equal to 2. In this case, j is an integer greater than or equal to 1 and less than or equal to Z.

[0116] As shown in Figures 11 and 12, when base station #1 of 901_1 transmits a "reference signal 1101_i for sector sweep at transmitting panel antenna i for frequency ♭p," the "reference signal 1201_j based on the jth parameter at transmitting panel antenna i for frequency ♭p" is assumed to include, for example, the following information:

[0117] - ID (identification) of the transmitting panel antenna (here, for example, corresponds to i) Identification number (ID) of the parameter used in beamforming (directivity control) (here, for example, corresponds to j) When a terminal transmits a reference signal for sector sweep, the number of time divisions in which the reference signal for sector sweep can be transmitted (this will be explained later).

[0118] Note that the "reference signal 1201_j based on the j-th parameter in the transmitting panel antenna i for frequency ♭p" may include other information. Examples of such information will be described in other embodiments, for example, in the sixth embodiment and onward.

[0119] Furthermore, the "reference signal 1201_j based on the j-th parameter in the transmitting panel antenna i for frequency ♭p" may include the following information.

[0120] Information about the frequency band and / or frequency ♭p (which may include information about the number of frequency divisions) (This will be explained later.)

[0121] By base station #1 of 901_1 transmitting the "ID (identification) of the transmitting panel antenna for frequency ♭p" and the "ID of the parameter used in beamforming (directional control)", the terminal can know the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directional control)" that it was able to receive, and base station #1 of 901_1 and the terminal can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0122] It should be noted that the "number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal" may be changeable depending on the frame and / or time, etc. This has the effect of improving the data transmission efficiency of the communication system.

[0123] Furthermore, by base station #1 of 901_1 transmitting "information regarding the frequency band and / or frequency ♭p," the terminal obtains this information, and by transmitting "frequency-related information that the terminal wants the base station to transmit" to the base station, the base station can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0124] Next, an explanation will be given of the operation in the time interval from time t1 to t2, which is the terminal response interval in Fig. 10. In this first embodiment, an explanation will be given taking as an example a case where the terminal uses OFDM and the frequencies (bands) used by the base station and the frequencies (bands) used by the terminal partially contain the same frequencies (bands).

[0125] Fig. 13 shows an example of operation in the time interval from time t1 to t2, which is the terminal response interval. In Fig. 13, the horizontal axis represents time. Terminals such as terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6 in Fig. 9 transmit sector sweep reference signals in the time interval from time t1 to t2, which is the terminal response interval.

[0126] 10 and 13, for example, it is assumed that base station #1 of 901_1 transmits a sector sweep reference signal in the time interval from time t0 to t1. Thereafter, in the terminal response interval which is the time interval from time t1 to t2, as shown in FIG. 13, there are a first transmission interval 1301_1 of a "sector sweep reference signal" for the terminal, a second transmission interval 1301_2 of a "sector sweep reference signal" for the terminal, a third transmission interval 1301_3 of a "sector sweep reference signal" for the terminal, and a fourth transmission interval 1301_4 of a "sector sweep reference signal" for the terminal.

[0127] Therefore, in the case of FIG. 13, the base station #1 of 901_1 sets "the number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal" to 4.

[0128] Fig. 14 shows an example of terminal occupation in the first transmission interval 1301_1 of the "sector sweep reference signal" for the terminal, the second transmission interval 1301_2 of the "sector sweep reference signal" for the terminal, the third transmission interval 1301_3 of the "sector sweep reference signal" for the terminal, and the fourth transmission interval 1301_4 of the "sector sweep reference signal" for the terminal shown in Fig. 13. In Fig. 14, the horizontal axis represents time and the vertical axis represents frequency.

[0129] Terminal #1 902_1 in Fig. 9 receives sector sweep reference signal 1001 transmitted by base station #1 901_1, and estimates the "frequency band, transmitting panel antenna, and parameter number" with the best reception quality among the transmitting panel antennas of base station #1 901_1. This estimation can be performed by obtaining sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" contained therein. Alternatively, "information related to the frequency band and / or frequency ♭p" contained in sector sweep reference signal 1001 may be used.

[0130] It is assumed that terminal #1 of 902_1 has estimated that the "transmitting panel antenna and parameters" with good reception quality are, for example, "transmitting panel antenna a1 and parameters b1." It is also assumed that terminal #1 of 902_1 has estimated that the "frequency domain" with good reception quality is frequency band ♭K.

[0131] Furthermore, terminal #1 of 902_1 estimates the "transmitting panel antenna and parameters" with good reception quality, and at the same time obtains information on "the number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal." In the case of Fig. 14, terminal #1 of 902_1 obtains information that "the number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal" is 4.

[0132] In this case, terminal #1 of 902_1 obtains, for example, one of the values ​​"0," "1," "2," or "3" using a random number. For example, assume that terminal #1 of 902_1 obtains "0" using a random number. In this case, since "0" + 1 = 1, terminal #1 of 902_1 transmits terminal #1 "sector sweep reference signal 1401_1" using the first (="0" + 1) transmission interval 1301_1 of the "terminal-specific "sector sweep reference signal" in FIG. 14. Note that here, the transmission interval of the sector sweep reference signal is set using a random number. However, instead of a random number, the transmission interval of the sector sweep reference signal may be set using, for example, a random integer or natural number, an irregular integer or natural number, a regular integer or natural number, an integer or natural number unique to a terminal, or the like. Therefore, setting the transmission interval of the sector sweep reference signal is not limited to the above example. For example, the transmission interval of the sector sweep reference signal may be set for each terminal. This point is also applicable to the following similar explanations.

[0133] It is assumed that the "sector sweep reference signal" 1401_1 of terminal #1 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #1 of 902_1, i.e., information on the "transmitting panel antenna a1 and parameters b1." The "sector sweep reference signal" 1401_1 of terminal #1 may also include information on the "frequency domain," for example, information on the "frequency band ♭K." This will be explained later.

[0134] Similarly, terminal #2 902_2 in Fig. 9 receives sector sweep reference signal 1001 transmitted by base station #1 901_1, and estimates the "frequency band, transmitting panel antenna, and parameter number" with the best reception quality among the transmitting panel antennas of base station #1 901_1. This estimation can be performed by obtaining sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" contained therein. Alternatively, "information related to the frequency band and / or frequency ♭p" contained in sector sweep reference signal 1001 may be used.

[0135] It is assumed that terminal #2 of 902_2 has estimated that the "transmitting panel antenna and parameters" with good reception quality are, for example, "transmitting panel antenna a2 and parameters b2." It is also assumed that terminal #2 of 902_2 has estimated that the "frequency domain" with good reception quality is frequency band ♭1.

[0136] Furthermore, terminal #2 of 902_2 estimates the "transmitting panel antenna and parameters" with good reception quality, and at the same time, obtains information on "the number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal." In the case of Fig. 14, terminal #2 of 902_2 obtains information that "the number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal" is 4.

[0137] In this case, terminal #2 of 902_2 obtains, for example, one of the values ​​"0," "1," "2," or "3" using a random number. For example, terminal #2 of 902_2 obtains "1" using a random number. In this case, since "1"+1=2, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal 1401_2" using the second (="1"+1) transmission interval 1301_2 of the "terminal "sector sweep reference signal"" in FIG. 14.

[0138] It is assumed that the "sector sweep reference signal 1401_2" for terminal #2 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, i.e., information on the "transmitting panel antenna a2 and parameter b2." The "sector sweep reference signal" 1401_2 for terminal #2 may also include information on the "frequency domain," for example, information on the "frequency band ♭1." This point will be explained later.

[0139] Therefore, terminal #i of 902_i receives sector sweep reference signal 1001 transmitted by base station #1 of 901_1, and estimates the "frequency band, transmitting panel antenna, and parameter number" with the best reception quality among the transmitting panel antennas of base station #1 of 901_1. This estimation can be performed by obtaining sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" contained therein. For example, i is an integer equal to or greater than 1. Alternatively, information on the "frequency band and / or frequency ♭p" contained in sector sweep reference signal 1001 may be used.

[0140] It is assumed that terminal #i of 902_i has estimated that the "transmitting panel antenna and parameters" with good reception quality are, for example, "transmitting panel antenna ai and parameters bi." It is also assumed that terminal #i of 902_i has estimated that the "frequency domain" with good reception quality is frequency band ♭zi.

[0141] Furthermore, terminal #i of 902_i estimates the "transmitting panel antenna and parameters" with good reception quality, and at the same time obtains information on "the number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal." In the case of Fig. 14, terminal #i of 902_i obtains information that "the number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal" is 4.

[0142] In this case, terminal #i of 902_i uses a random number to obtain, for example, one of the values ​​"0," "1," "2," or "3." For example, terminal #i of 902_i uses a random number to obtain "yi." Note that yi takes the value "0," "1," "2," or "3." In this case, terminal #i of 902_i transmits terminal #i "sector sweep reference signal" 1401_i using the ("yi"+1)-th transmission interval 1301_("yi"+1) of the "sector sweep reference signal" for terminal #i in FIG. 14.

[0143] It is assumed that the "sector sweep reference signal" 1401_i for terminal #i includes information on the "transmitting panel antenna and parameters" that terminal #i of 902_i has obtained with good reception quality, i.e., information on the "transmitting panel antenna ai and parameters bi." The "sector sweep reference signal" 1401_i for terminal #i may also include information on the "frequency domain," for example, information on the "frequency band ♭p." This will be explained later.

[0144] As shown in FIG. 14, the "sector sweep reference signal" 1401_i for terminal #i may be assigned to multiple frequency bands. For example, the "sector sweep reference signal" 1401_3 for terminal #3 is assigned to frequency band ♭1 and frequency band ♭2. As another example, the "sector sweep reference signal" 1401_i for terminal #i may be assigned to frequency band ♭1 and frequency band ♭K, so that the "sector sweep reference signal" 1401_i for terminal #i may be assigned to discrete frequency bands. (Therefore, the "sector sweep reference signal" 1401_i for terminal #i is assigned to one or more frequency bands.)

[0145] By doing the above, it is possible to reduce collisions between sector sweep reference signals transmitted by each terminal, thereby increasing the number of sector sweep reference signals that the base station can receive, and thereby increasing the number of terminals with which the base station communicates.

[0146] The configuration of the terminal #i "sector sweep reference signal" 1401_i transmitted by the terminal #i of 902_i described with reference to FIG. 14 will be described. For simplicity of explanation, it is assumed that the terminal #i of 902_i has the configurations shown in FIGS. 1A, 1B, and 1C. It is also assumed that the terminal #i of 902_i having the configurations shown in FIGS. 1A, 1B, and 1C has the configuration shown in FIG. 3 as the transmitting panel antenna xi of 106_xi. However, the configuration of the terminal #i of 902_i is not limited to the configurations shown in FIGS. 1A, 1B, and 1C, and the configuration of the transmitting panel antenna xi of 106_xi of the terminal #i of 902_i having the configurations shown in FIGS. 1A, 1B, and 1C is not limited to that shown in FIG. 3.

[0147] Terminal #i of terminal 902_i transmits terminal #i "sector sweep reference signal" 1401_i as shown in Fig. 14. Fig. 15A shows an example of the configuration of terminal #i "sector sweep reference signal" 1401_i. In Fig. 15A, the horizontal axis represents time.

[0148] As shown in Figure 15A, the "sector sweep reference signal" 1401_i of terminal #i of 902_i is composed of "sector sweep reference signal 1501_1 at terminal #i transmitting panel antenna 1, sector sweep reference signal 1501_2 at terminal #i transmitting panel antenna 2, ..., sector sweep reference signal 1501_M at terminal #i transmitting panel antenna M."

[0149] For example, terminal #i 902_i having the configuration of FIGS. 1A, 1B, and 1C transmits "sector sweep reference signal 1501_1 in transmission panel antenna 1 of terminal #i" using transmission panel antenna 1 106_1.

[0150] 1A, 1B, and 1C, terminal #i of 902_i transmits "sector sweep reference signal 1501_k at transmission panel antenna k of terminal #i" using transmission panel antenna k of 106_k, where k is an integer between 1 and M.

[0151] In FIG. 15A, the number of transmitting panel antennas possessed by terminal #i of 902_i is set to M, but this is not limited thereto, and the number of transmitting panel antennas may be set to N (N is an integer equal to or greater than 1).

[0152] Fig. 15B shows an example of the configuration of "sector sweep reference signal 1501_xi in transmission panel antenna xi of terminal #i" in Fig. 15A. Note that in Fig. 15, the horizontal axis represents time.

[0153] As shown in FIG. 15B, the "reference signal 1501_xi for sector sweep at the transmitting panel antenna xi of terminal #i" is assumed to be composed of, for example, "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi," "reference signal 1511_2 based on the second parameter at the transmitting panel antenna xi," "reference signal 1511_3 based on the third parameter at the transmitting panel antenna xi," and "reference signal 1511_4 based on the fourth parameter at the transmitting panel antenna xi."

[0154] For example, it is assumed that the terminal #i of 902_i having the configuration of FIGS. 1A, 1B, and 1C has the configuration of FIG. 3 as the transmitting panel antenna xi of 106_xi.

[0155] The "reference signal 1511_1 based on the first parameter in the transmitting panel antenna xi" will be described.

[0156] When terminal #i of 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_1 at transmitting panel antenna xi of 106_xi to w1(xi,1). If first transmission signal 303_1 in "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" is tx1ref1(t), multiplier 304_1 obtains tx1ref1(t)×w1(xi,1). Then, terminal #i of 902_i transmits tx1ref1(t)×w1(xi,1) from antenna 306_1 of FIG. 3, where t is time.

[0157] When terminal #i of 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna xi of 106_xi to w2(xi,1). If second transmission signal 303_2 in "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" is tx2ref1(t), multiplier 304_2 obtains tx2ref1(t)×w2(xi,1). Then, terminal #i of 902_i transmits tx2ref1(t)×w2(xi,1) from antenna 306_2 of FIG. 3.

[0158] When terminal #i of 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna xi of 106_xi to w3(xi,1). If third transmission signal 303_3 in "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" is tx3ref1(t), multiplier 304_3 obtains tx3ref1(t) × w3(xi,1). Then, terminal #i of 902_i transmits tx3ref1(t) × w3(xi,1) from antenna 306_3 of FIG. 3.

[0159] When terminal #i of 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of 106_xi to w4(xi,1). If fourth transmission signal 303_4 in "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" is tx4ref1(t), multiplier 304_4 obtains tx4ref1(t) × w4(xi,1). Then, terminal #i of 902_i transmits tx4ref1(t) × w4(xi,1) from antenna 306_4 of FIG. 3.

[0160] The "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" will be described.

[0161] When terminal #i of 902_i transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_1 at transmitting panel antenna xi of 106_xi to w1(xi,j). If first transmission signal 303_1 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" is tx1refj(t), multiplier 304_1 obtains tx1refj(t)×w1(xi,j). Then, terminal #i of 902_i transmits tx1refj(t)×w1(xi,j) from antenna 306_1 of FIG. 3, where t is time.

[0162] When terminal #i of 902_i transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna x i" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna x i of 106_x i to w2(x i,j). If second transmission signal 303_2 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna x i" is tx2refj(t), multiplier 304_2 obtains tx2refj(t)×w2(x i,j). Then, terminal #i of 902_i transmits tx2refj(t)×w2(x i,j) from antenna 306_2 of FIG. 3.

[0163] When terminal #i of 902_i transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna x i" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna x i of 106_x i to w3(x i,j). If third transmission signal 303_3 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna x i" is tx3refj(t), multiplier 304_3 obtains tx3refj(t)×w3(x i,j). Then, terminal #i of 902_i transmits tx3refj(t)×w3(x i,j) from antenna 306_3 of FIG. 3.

[0164] When terminal #i of 902_i transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of 106_xi to w4(xi,j). If fourth transmission signal 303_4 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" is tx4refj(t), multiplier 304_4 obtains tx4refj(t)×w4(xi,j). Then, terminal #i of 902_i transmits tx4refj(t)×w4(xi,j) from antenna 306_4 of FIG. 3.

[0165] In the case of Fig. 15B, j is an integer greater than or equal to 1 and less than or equal to 4. In Fig. 15B, the number of parameter changes Z is set to Z=4, but the number of parameter changes Z is not limited to 4, and can be implemented in the same way as long as Z is an integer greater than or equal to 1 or an integer greater than or equal to 2. In this case, j is an integer greater than or equal to 1 and less than or equal to Z.

[0166] As shown in Figures 14, 15A, and 15B, when terminal #i of 902_i transmits a "reference signal 1501_xi for sector sweep at terminal #i's transmitting panel antenna xi," the "reference signal 1511_j based on the jth parameter at transmitting panel antenna xi" is assumed to include, for example, the following information:

[0167] As mentioned above, information on the "transmitting panel antenna and parameters" of base station #1 of 901_1, which has good reception quality.

[0168] Therefore, terminal #i of 902_i will transmit "information on the transmitting panel antenna and parameters of base station #1 of 901_1 with good reception quality" in "reference signal 1501_1 for sector sweep at terminal #i transmitting panel antenna 1," "reference signal 1501_2 for sector sweep at terminal #i transmitting panel antenna 2," ..., "reference signal 1501_M for sector sweep at terminal #i transmitting panel antenna M" in Figure 15A.

[0169] It should be noted that the "reference signal 1511_j based on the j-th parameter in the transmitting panel antenna xi" may include other information.

[0170] Furthermore, in the "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi," "reference signal 1511_2 based on the second parameter at transmitting panel antenna xi," "reference signal 1511_3 based on the third parameter at transmitting panel antenna xi," and "reference signal 1511_4 based on the fourth parameter at transmitting panel antenna xi" in Figure 15B of "reference signal 1501_1 for sector sweep at transmitting panel antenna 1 of terminal #i," "reference signal 1501_2 for sector sweep at transmitting panel antenna 2 of terminal #i," ..., "reference signal 1501_M for sector sweep at transmitting panel antenna M of terminal #i" in Figure 15A, terminal #i of 902_i will transmit "information on the transmitting panel antenna and parameters" of base station #1 of 901_1 with good reception quality."

[0171] In this case, even if the base station #1 of 901_1 uses, for example, an omni-antenna, it is highly likely that it can receive any of the "sector sweep reference signal 1501_1 at the transmitting panel antenna 1 of terminal #i," "sector sweep reference signal 1501_2 at the transmitting panel antenna 2 of terminal #i," ..., "sector sweep reference signal 1501_M at the transmitting panel antenna M of terminal #i" in FIG. 15A transmitted by the terminal #i of 902_i. This is because the terminal #i of 902_i is performing transmit beamforming (directivity control). This has the effect of increasing the likelihood that the base station #1 of 901_1 can obtain "information on the transmitting panel antenna and parameters of the base station #1 of 901_1 with good reception quality" transmitted by the terminal #i of 902_i. Therefore, the base station #1 of 901_1 can transmit a modulated signal to the terminal #i of 902_i based on the "information on the transmitting panel antenna and parameters" of the base station #1 of 901_1 with good reception quality, and the terminal #i of 902_i can receive the modulated signal with high reception quality.

[0172] In addition, as shown in Figure 14, when multiple terminals are transmitting sector sweep reference signals, base station #1 of 901_1 can obtain information on the ``transmitting panel antenna and parameters'' of base station #1 of 901_1 with good reception quality from the multiple terminals, thereby allowing base station #1 of 901_1 to transmit modulated signals to the multiple terminals based on the ``information on the ``transmitting panel antenna and parameters'' of base station #1 of 901_1 with good reception quality'' from the multiple terminals, and the multiple terminals can receive the modulated signals with high reception quality.

[0173] Also, as shown in Figures 14, 15A, and 15B, when terminal #i of 902_i transmits a "reference signal 1501_xi for sector sweep at terminal #i's transmitting panel antenna xi," the "reference signal 1511_j based on the jth parameter at transmitting panel antenna xi" may include, for example, the following information:

[0174] - ID (identification) of the transmitting panel antenna (e.g., xi) Identification number (ID) of the parameter used in beamforming (directivity control) (here, for example, corresponds to j)

[0175] When terminal #i of 902_i transmits the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)", base station #1 of 901_1 can know the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" that it was able to receive, and terminal #i of 902_i and base station #1 of 901_1 can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0176] Note that the "reference signal 1511_j based on the j-th parameter in the transmitting panel antenna xi" may include other information. Examples of this will be described in other embodiments, for example, in the sixth embodiment and onward.

[0177] As shown in Figures 14, 15A, and 15B, when terminal #i of 902_i transmits a "reference signal 1501_xi for sector sweep at terminal #i's transmitting panel antenna xi," the "reference signal 1511_j based on the jth parameter at transmitting panel antenna xi" may include, for example, the following information:

[0178] "Information about the frequency band and / or frequency ♭p that terminal #i of 902_i has used for transmission or wants base station #1 of 901_1 to use"

[0179] When terminal #i of 902_i transmits the "information regarding the frequency band and / or frequency ♭p," base station #1 of 901_1 can know the "information regarding the frequency band and / or frequency ♭p," and terminal #i of 902_i and base station #1 of 901_1 can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0180] However, when base station #1 of 901_1 and terminal #i of 902_i are communicating using the same frequency band, they can know the "information regarding the frequency band and / or frequency ♭p" by detecting the modulated signal transmitted by the other party, without transmitting the "information regarding the frequency band and / or frequency ♭p."

[0181] FIG. 16A shows an example of the configuration of a feedback signal 1002 transmitted by base station #1 of 901_1 in the time interval from t2 to t3 in FIG. 10. In FIG. 16A, the horizontal axis represents time and the vertical axis represents frequency. In this example, since the "number of time divisions in which a sector sweep reference signal can be transmitted when a terminal transmits a sector sweep reference signal" is 4, as shown in FIG. 16A, the feedback signal 1002 includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval. In addition, for example, if the "number of time divisions in which a sector sweep reference signal can be transmitted when a terminal transmits a sector sweep reference signal" is Ω, the feedback signal 1002 may include Ω transmission intervals. Here, Ω is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0182] In addition, in FIG. 16A, it is assumed that feedback signal 1002 includes frequency band ♭1, frequency band ♭2, . . . , frequency band ♭K.

[0183] Therefore, the first transmission interval includes a first transmission interval 1601_11 for a feedback signal for frequency ♭1, a first transmission interval 1601_21 for a feedback signal for frequency ♭2, and a first transmission interval 1601_K1 for a feedback signal for frequency ♭K. Similarly, the second transmission interval includes a second transmission interval 1601_12 for a feedback signal for frequency ♭1, a second transmission interval 1601_22 for a feedback signal for frequency ♭2, and a second transmission interval 1601_K2 for a feedback signal for frequency ♭K. The third transmission interval includes a third transmission interval 1601_13 for a feedback signal for frequency ♭1, a third transmission interval 1601_23 for a feedback signal for frequency ♭2, and a third transmission interval 1601_K3 for a feedback signal for frequency ♭K. In the fourth transmission section, there are a fourth transmission section 1601_14 for a feedback signal for frequency ♭1, a fourth transmission section 1601_24 for a feedback signal for frequency ♭2, . . . , a fourth transmission section 1601_K4 for a feedback signal for frequency ♭K.

[0184] One feature is that "in FIG. 16A, in the ith time interval, the feedback signal is transmitted from the same transmitting panel antenna regardless of the frequency band."

[0185] FIG. 16B shows an example of a specific feedback signal assignment for the feedback signal 1002 shown in FIG. 16A.

[0186] For example, as shown in FIG. 14, terminal #1 of 902_1 transmits terminal #1 "sector sweep reference signal" 1401_1, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" 1401_2, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" 1401_3, terminal #4 of 902_4 transmits terminal #4 "sector sweep reference signal" 1401_4, terminal #5 of 902_5 transmits terminal #5 "sector sweep reference signal" 1401_5, and terminal #6 of 902_6 transmits terminal #6 "sector sweep reference signal" 1401_6.

[0187] As shown in FIG. 14, since the "sector sweep reference signal" 1401_1 of terminal #1 exists in frequency band ♭K, in FIG. 16B, the feedback signal 1611_1 addressed to terminal #1 exists in frequency band ♭K.

[0188] As shown in FIG. 14, since the "sector sweep reference signal" 1401_2 of terminal #2 exists in frequency band ♭1, in FIG. 16B, the feedback signal 1611_2 addressed to terminal #2 exists in frequency band ♭1.

[0189] As shown in FIG. 14, since the "sector sweep reference signal" 1401_3 of terminal #3 exists in the frequency bands ♭1 and ♭2, in FIG. 16B, the feedback signal 1611_3 addressed to terminal #3 exists in the frequency bands ♭1 and ♭2.

[0190] As shown in FIG. 14, since the "sector sweep reference signal" 1401_4 of terminal #4 exists in frequency band ♭2, in FIG. 16B, the feedback signal 1611_4 addressed to terminal #4 exists in frequency band ♭2.

[0191] As shown in FIG. 14, since the "sector sweep reference signal" 1401_5 of terminal #5 exists in frequency band ♭2, in FIG. 16B, the feedback signal 1611_5 addressed to terminal #5 exists in frequency band ♭2.

[0192] As shown in FIG. 14, since the "sector sweep reference signal" 1401_6 of terminal #6 exists in frequency band ♭K, in FIG. 16B, the feedback signal 1611_6 addressed to terminal #6 exists in frequency band ♭K.

[0193] In this way, by receiving the feedback signal 1611_i addressed to the terminal #i, the terminal #i of 902_i can know that communication with the base station #1 of 901_1 has become possible, and can also know the frequency band to be used. Note that Fig. 16B is merely an example, and for example, if the feedback signal 1611_1 addressed to the terminal #1 does not exist as the feedback signal 1002, the terminal #1 of 902_1 will know that communication with the base station #1 of 901_1 has not been established.

[0194] At this time, the feedback signal 1611_i addressed to terminal #i is assumed to include, for example, information indicating that communication with terminal #i of 902_i is possible (or that frame 1003 including data symbols in FIG. 10 includes symbols addressed to terminal #i of 902_i).

[0195] Furthermore, based on the "frequency (band) information" and "transmitting panel antenna and parameter information" of base station #1 of 901_1 with good reception quality transmitted by terminal #i of 902_i, base station #1 of 901_1 selects the frequency (band) and transmitting panel antenna, sets beamforming parameters, and transmits feedback signal 1611_i addressed to terminal #i.

[0196] FIG. 17A shows an example of the configuration of a frame 1003 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in FIG. 10. In FIG. 17A, the horizontal axis represents time and the vertical axis represents frequency. In this example, since the "number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal" is 4, as shown in FIG. 17A, the frame 1003 including data symbols includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval. Note that, for example, if the "number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal" is Ω, the frame 1003 including data symbols may be configured to include Ω transmission intervals. Here, Ω is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0197] Also, in FIG. 17A, it is assumed that frame 1003 including data symbols includes frequency band ♭1, frequency band ♭2, . . . , frequency band ♭K.

[0198] Therefore, the first transmission interval includes a first transmission interval 1701_11 for a modulated signal (slot) for frequency ♭1, a first transmission interval 1701_21 for a modulated signal (slot) for frequency ♭2, and a first transmission interval 1701_K1 for a modulated signal (slot) for frequency ♭K. Similarly, the second transmission interval includes a second transmission interval 1701_12 for a modulated signal (slot) for frequency ♭1, a second transmission interval 1701_22 for a modulated signal (slot) for frequency ♭2, and a second transmission interval 1701_K2 for a modulated signal (slot) for frequency ♭K. The third transmission interval includes a third transmission interval 1701_13 for a modulated signal (slot) for frequency ♭1, a third transmission interval 1701_23 for a modulated signal (slot) for frequency ♭2, and a third transmission interval 1701_K3 for a modulated signal (slot) for frequency ♭K. The fourth transmission section includes a fourth transmission section 1701_14 for a modulated signal (slot) for frequency ♭1, a fourth transmission section 1701_24 for a modulated signal (slot) for frequency ♭2, ..., a fourth transmission section 1701_K4 for a modulated signal (slot) for frequency ♭K.

[0199] FIG. 17B shows an example of specific modulation signal (slot) allocation for frame 1003 including the data symbols shown in FIG. 17A.

[0200] For example, as shown in FIG. 14, terminal #1 of 902_1 transmits terminal #1 "sector sweep reference signal" 1401_1, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" 1401_2, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" 1401_3, terminal #4 of 902_4 transmits terminal #4 "sector sweep reference signal" 1401_4, terminal #5 of 902_5 transmits terminal #5 "sector sweep reference signal" 1401_5, and terminal #6 of 902_6 transmits terminal #6 "sector sweep reference signal" 1401_6.

[0201] As shown in FIG. 14, since the "sector sweep reference signal" 1401_1 of terminal #1 exists in frequency band ♭K, in FIG. 17B, modulated signal (slot) 1711 addressed to terminal #1 exists in frequency band ♭K.

[0202] As shown in FIG. 14, since the "sector sweep reference signal" 1401_2 for terminal #2 exists in frequency band ♭1, in FIG. 17B, the modulated signal (slot) 1712 addressed to terminal #2 exists in frequency band ♭1.

[0203] As shown in FIG. 14, since the "sector sweep reference signal" 1401_3 of terminal #3 exists in frequency bands ♭1 and ♭2, in FIG. 17B, the modulated signal (slot) 1713 addressed to terminal #3 exists in frequency bands ♭1 and ♭2.

[0204] As shown in FIG. 14, since the "sector sweep reference signal" 1401_4 of terminal #4 exists in frequency band ♭2, in FIG. 17B, the modulated signal (slot) 1714 addressed to terminal #4 exists in frequency band ♭2.

[0205] As shown in FIG. 14, since the "sector sweep reference signal" 1401_5 of terminal #5 exists in frequency band ♭2, in FIG. 17B, the modulated signal (slot) 1715 addressed to terminal #5 exists in frequency band ♭2.

[0206] As shown in FIG. 14, since the "sector sweep reference signal" 1401_6 of terminal #6 exists in frequency band ♭K, in FIG. 17B, the modulated signal (slot) 1716 addressed to terminal #6 exists in frequency band ♭K.

[0207] At this time, it is assumed that the modulated signal (slot) 171i addressed to terminal #i includes, for example, a data symbol (data, information) addressed to terminal #i of 902_i.

[0208] In this way, the terminal #i of 902_i can know that communication with the base station #1 of 901_1 has become possible by the modulated signal (slot) 171i addressed to the terminal #i, and can also know the frequency band to be used. Note that Fig. 17B is merely an example, and for example, if the modulated signal (slot) 1711 addressed to the terminal #1 does not exist as the frame 1003 including the data symbol, the terminal #1 of 902_1 will know that communication with the base station #1 of 901_1 has not been established.

[0209] At this time, based on the "frequency (band) information" and "transmitting panel antenna and parameter information" of base station #1 of 901_1 with good reception quality transmitted by terminal #i of 902_i, base station #1 of 901_1 selects the frequency (band) and transmitting panel antenna, sets beamforming parameters, and transmits modulated signal (slot) 171i addressed to terminal #i.

[0210] In addition, in Figures 16A and 16B, base station #1 of 901_1 receives ``sector sweep reference signal'' 1401_i for terminal #i transmitted by terminal #i of 902_i, and estimates the ``frequency (band)'' and ``transmitting panel antenna and parameters'' of terminal #i of 902_1 with good reception quality, and this information may be included in feedback signal 1611_i addressed to terminal #i.

[0211] As a result, terminal #i of 902_i selects a frequency (band) and a transmitting panel antenna based on information on the "frequency (band)," "transmitting panel antenna, and parameters" of terminal #i of 902_i with good reception quality obtained from base station #1 of 901_1, determines a beamforming method, and transmits symbols, frames, and / or modulated signals to base station #1 of 901_1, thereby achieving the effect of improving the reception quality of data at base station #1 of 901_1.

[0212] Also, in the time period from t3 to t4 in Figure 10, terminal #i of 902_i may transmit a modulated signal to base station #1 of 901_1 including information such as an ACK (acknowledgement) indicating that the signal from base station #1 of 901_1 has been received.

[0213] 17B may include, in addition to data symbols, reference signals such as a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), and a sounding reference signal (SRS), pilot symbols, pilot signals, preambles, and symbols containing control information. Possible symbols containing control information include information about the destination terminal (an ID that can identify the terminal), a method for transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (such as code length and coding rate), and information about the MCS (Modulation and Coding Scheme).

[0214] 18 shows an example of a situation when the base station #1 of 901_1 and "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" are communicating as in FIG. 9. FIG. 18(A) shows an example of a transmission situation of a modulated signal of the base station #1 of 901_1, and FIG. 18(B) shows an example of a transmission situation of a modulated signal of "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6". In FIG. 18(A) and FIG. 18(B), the horizontal axis represents time.

[0215] First, the base station #1 of 901_1 transmits a sector sweep reference signal 1801_1. Note that this point has already been explained with reference to FIG. 10, so the explanation will be omitted.

[0216] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit sector sweep reference signals 1851_1. Note that this point has already been explained using Fig. 13, Fig. 14, Fig. 15A, Fig. 15B, etc., so explanation will be omitted.

[0217] The base station #1 of 901_1 transmits a feedback signal 1802_1. Note that this point has already been explained using Figs. 16A and 16B, so the explanation will be omitted.

[0218] Thereafter, base station #1 of 901_1 transmits "frame 1803_1 including data symbols." Note that this point has already been explained using FIGS. 17A and 17B, so the explanation will be omitted. (Therefore, "frame 1803_1 including data symbols" is considered to be, for example, a frame for downlink.)

[0219] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit "frame 1852_1 including data symbols." The configuration of this frame will be explained later with reference to Figures 20A to 20F. (Therefore, "frame 1852_1 including data symbols" is considered to be, for example, a frame for uplink.)

[0220] Next, the base station #1 of 901_1 transmits a "frame 1803_2 including a data symbol." Note that the method of configuring the "frame 1803_2 including a data symbol" is as described with reference to Figs. 17A and 17B.

[0221] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit "frame 1852_2 including data symbols." The configuration of this frame will be described later with reference to Figures 20A to 20F.

[0222] Figure 19 shows an example of the transmission status of modulated signals from base station #1 of 901_1 in Figure 18 onwards and the transmission status of modulated signals from terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6".

[0223] FIG. 19(A) shows an example of a transmission status of a modulated signal from the base station #1 of 901_1, which is a continuation in time of the transmission status of a modulated signal from the base station #1 of 901_1 of FIG. 18(A).

[0224] Figure 19(B) shows an example of the transmission status of modulated signals of "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6," and is a temporal continuation of the transmission status of modulated signals of "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" in Figure 18(B).

[0225] In addition, in FIGS. 19(A) and 19(B), the horizontal axis represents time.

[0226] 18(A) and 18(B), the base station #1 of 901_1 transmits a "frame 1803_3 including a data symbol." The method of configuring the "frame 1803_3 including a data symbol" is as described with reference to FIGS. 17A and 17B.

[0227] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit "frame 1852_3 including data symbol." Note that the configuration of this frame will be described later with reference to Figures 20A to 20F.

[0228] Next, the base station #1 of 901_1 transmits a sector sweep reference signal 1801_2. Note that this point has already been explained with reference to FIG.

[0229] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit a sector sweep reference signal 1851_2. Note that this point has already been explained using Fig. 13, Fig. 14, Fig. 15A, Fig. 15B, etc., so the explanation will be omitted.

[0230] The base station #1 of 901_1 transmits a feedback signal 1802_2. Note that this point has already been explained using Figs. 16A and 16B, so the explanation will be omitted.

[0231] Thereafter, the base station #1 of 901_1 transmits a "frame 1803_4 including a data symbol." Note that this point has already been explained using Figs. 17A and 17B, so the explanation will be omitted.

[0232] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit "frame 1852_4 including data symbols." The configuration of this frame will be described later with reference to Figures 20A to 20F.

[0233] In this way, before "transmission of a 'frame including data symbols' by base station #1 of 901_1 and / or transmission of a 'frame including data symbols' by terminals such as terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6," base station #1 of 901_1 and the terminals transmit a sector sweep reference signal, and "transmission of a 'frame including data symbols' by base station #1 of 901_1 and / or transmission of a 'frame including data symbols' by terminals such as terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" And / or, after "transmission of a frame including a data symbol" from terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6," the base station and / or terminals can obtain the effect of obtaining high data reception quality by again transmitting a sector sweep reference signal and setting the frequency (band), selecting the transmitting panel antenna to be used, and setting the transmitting beamforming.

[0234] Next, a configuration example of "frame 1852_i including data symbols" transmitted by terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" will be described with reference to Figures 20A to 20F. Note that, for example, i is an integer equal to or greater than 1, and in Figures 20A to 20F, the horizontal axis represents time.

[0235] As shown in Figures 20A, 20B, 20C, 20D, 20E, and 20F, it is assumed that "frame 1852_i including data symbols" is composed of a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval. It is also assumed that "frame 1852_i including data symbols" includes frequency band ♭1, frequency band ♭2, ..., frequency band ♭K.

[0236] As shown in FIG. 20A, for example, terminal #1 of 902_1 transmits a terminal #1 transmission frame 2001_1 (including a data symbol) using frequency band ♭K and the first transmission interval.

[0237] Note that "terminal #1 of 902_1 transmits terminal #1 transmission frame 2001_1 (including a data symbol) using frequency band ♭K," because "base station #1 of 901_1 transmits a modulated signal (slot) addressed to terminal #1 of 902_1 using frequency band ♭K," as shown in FIG. 17B.

[0238] Also, as shown in FIG. 20B, for example, terminal #2 of 902_2 transmits a transmission frame 2001_2 for terminal #2 (including a data symbol) using frequency band ♭1 and the second transmission interval.

[0239] Note that "terminal #2 of 902_2 is transmitting terminal #2 transmission frame 2001_2 (including a data symbol) using frequency band ♭1," because "base station #1 of 901_1 is transmitting a modulated signal (slot) addressed to terminal #2 of 902_2 using frequency band ♭1," as shown in FIG. 17B.

[0240] As shown in FIG. 20C, for example, terminal #3 of 902_3 transmits a transmission frame 2001_3 of terminal #3 (including a data symbol) using frequency bands ♭1 and ♭2 and the third transmission interval.

[0241] Note that "terminal #3 of 902_3 is transmitting terminal #3 transmission frame 2001_3 (including data symbols) using frequency bands ♭1 and ♭2," because "base station #1 of 901_1 is transmitting a modulated signal (slot) addressed to terminal #3 of 902_3 using frequency bands ♭1 and ♭2," as shown in FIG. 17B.

[0242] As shown in FIG. 20D, for example, terminal #4 of 902_4 transmits a transmission frame 2001_4 of terminal #4 (including a data symbol) using frequency band ♭2 and the first transmission interval.

[0243] Note that "terminal #4 of 902_4 is transmitting terminal #4 transmission frame 2001_4 (including a data symbol) using frequency band ♭2," because "base station #1 of 901_1 is transmitting a modulated signal (slot) addressed to terminal #4 of 902_4 using frequency band ♭2," as shown in FIG. 17B.

[0244] As shown in FIG. 20E, for example, terminal #5 of 902_5 transmits terminal #5 transmission frame 2001_5 (including a data symbol) using frequency band ♭2 and the fourth transmission interval.

[0245] Note that "terminal #5 of 902_5 is transmitting terminal #5 transmission frame 2001_5 (including data symbols) using frequency band ♭2," because "base station #1 of 901_1 is transmitting a modulated signal (slot) addressed to terminal #5 of 902_5 using frequency band ♭2," as shown in FIG. 17B.

[0246] As shown in FIG. 20F, for example, terminal #6 of 902_6 transmits a transmission frame 2001_6 of terminal #6 (including a data symbol) using frequency band ♭K and the third transmission interval.

[0247] Note that "terminal #6 of 902_6 is transmitting terminal #6 transmission frame 2001_6 (including a data symbol) using frequency band ♭K," because "base station #1 of 901_1 is transmitting a modulated signal (slot) addressed to terminal #6 of 902_6 using frequency band ♭K," as shown in FIG. 17B.

[0248] In this way, "frame 1852_i including data symbols" transmitted by terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" can be, for example, subjected to OFDMA and time division, with each terminal transmitting a frame, and base station #1 of 901_1 receiving the frames transmitted by each terminal, thereby suppressing interference and achieving high data reception quality.

[0249] In addition, in terminal #1 transmission frame 2001_1, terminal #2 transmission frame 2001_2, terminal #3 transmission frame 2001_3, terminal #4 transmission frame 2001_4, terminal #5 transmission frame 2001_5, and terminal #6 transmission frame 2001_6 in Figures 20A, 20B, 20C, 20D, 20E, and 20F, in addition to data symbols, they may also include, for example, ``reference signals such as DMRS, PTRS, and SRS,'' pilot symbols, pilot signals, preambles, and symbols containing control information.

[0250] 20A, 20B, 20C, 20D, 20E, and 20F illustrate the case where frames transmitted by a terminal are time-divided using OFDMA, but frames transmitted by a terminal may also be spatially divided using MU-MIMO (Multi User-MIMO (Multiple-Input Multiple-Output)).

[0251] In this embodiment, the terminals transmit modulated signals using a multi-carrier scheme such as OFDM, but the present invention is not limited to this. For example, when the terminals transmit signals using frames such as those shown in Figures 14, 20A, 20B, 20C, 20D, 20E, and 20F, each terminal may transmit a signal using a single-carrier scheme.

[0252] For example, in Fig. 14, terminal #1 of 902_1 may transmit terminal #1 "sector sweep reference signal" 1401_1 in frequency band ♭K by single carrier method. Also, in Fig. 20A, terminal #1 of 902_1 may transmit "terminal #1 transmission frame" 2001_1 in frequency band ♭K by single carrier method. Note that other terminals may also transmit signals by single carrier method in the same manner.

[0253] (Embodiment 2) In this embodiment 2, a description will be given of a communication system, a communication device, and a communication method using sector sweep, which is a modification of embodiment 1. In the following description of embodiment 2, the figures shown in embodiment 1 may be used.

[0254] 1A, 1B, and 1C show examples of the configuration of, for example, a base station, an access point, a terminal, a repeater, and a TRP in the second embodiment, and detailed operations have already been explained using Figures 2, 3, 4, 5, 6, 7, and 8, so explanations thereof will be omitted. Also, detailed operations of Figures 2, 3, 4, 5, 6, 7, and 8 have already been explained, so explanations thereof will be omitted.

[0255] Fig. 9 shows an example of a communication state in the second embodiment. As shown in Fig. 9, a case is considered in which a base station #1 of 901_1 communicates with a terminal #1 of 902_1, a terminal #2 of 902_2, a terminal #3 of 902_3, a terminal #4 of 902_4, a terminal #5 of 902_5, and a terminal #6 of 902_6. However, the relationship between the base station and the terminals is not limited to this example, and for example, a base station may communicate with one or more terminals.

[0256] In the following, an example will be described in which a base station uses the OFDMA system to transmit modulated signals to a terminal, and the terminal uses a multi-carrier system such as the OFDM system to transmit modulated signals to the base station.

[0257] Fig. 10 shows an example of a modulated signal 1000 transmitted by base station #1 901_1 in Fig. 9. In Fig. 10, the horizontal axis represents time and the vertical axis represents frequency. A sector sweep reference signal 1001 exists in the time interval from time t0 to t1. The sector sweep reference signal 1001 will be explained later.

[0258] The time period from time t1 to time t2 is a terminal response period. The terminal response will be explained later.

[0259] In the time period from time t2 to time t3, there is a feedback signal 1002. The feedback signal 1002 will be explained later.

[0260] In the time interval from time t4 to time t5, there is a frame 1003 including a data symbol. Note that the frame 1003 including a data symbol will be explained later.

[0261] 10, the signal is called a sector sweep reference signal 1001, but the name is not limited to this and may be called a reference signal, reference symbol, training signal, training symbol, reference signal, reference symbol, etc. Also, the signal is called a feedback signal 1002, but the name is not limited to this and may be called a feedback symbol, a signal addressed to a terminal, a symbol addressed to a terminal, a control signal, a control symbol, etc. And, the signal is called a frame 1003 including a data symbol, but the name is not limited to this and may be called a frame including a slot, minislot, unit, etc.

[0262] Fig. 21 shows an example of the configuration of the terminal response interval from time t1 to t2 in Fig. 10, with the horizontal axis representing time. In the time interval from time t0 to t1, there is a sector sweep reference signal 1001 transmitted by the base station.

[0263] Thereafter, in the time interval from time t1 to t2, there is a "sector sweep reference signal" x2701 for the terminal.

[0264] Fig. 11 shows an example of sector sweep reference signal 1001 in Fig. 10 transmitted by base station #1 901_1 in Fig. 9 having the configurations of Figs. 1A, 1B, and 1C. In Fig. 11, the horizontal axis represents time and the vertical axis represents frequency. In the example of Fig. 11, base station #1 901_1 transmits a modulated signal based on OFDMA, and therefore is divided into frequency bands ♭1, ♭2, ..., and ♭K as shown in Fig. 11. In addition, K is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0265] For example, in frequency band ♭1, there is a sector sweep reference signal 1101_11 for transmitting panel antenna 1 for frequency ♭1 in the first time interval, a sector sweep reference signal 1101_12 for transmitting panel antenna 2 for frequency ♭1 in the second time interval, ..., and a sector sweep reference signal 1101_1M for transmitting panel antenna M for frequency ♭1 in the Mth time interval.

[0266] Therefore, in frequency band ♭i, there is a sector sweep reference signal 1101_i1 for transmitting panel antenna 1 for frequency ♭i in the first time interval, a sector sweep reference signal 1101_i2 for transmitting panel antenna 2 for frequency ♭i in the second time interval, ..., a sector sweep reference signal 1101_iM for transmitting panel antenna M for frequency ♭i in the Mth time interval, where i is an integer between 1 and K.

[0267] Note that sector sweep reference signal 1101_ij for transmitting panel antenna j for frequency ♭i is transmitted from transmitting panel antenna j of 106_j of base station #1 901_1 having the configurations shown in Figures 1A, 1B, and 1C, where j is an integer between 1 and M.

[0268] One feature of this method is that in Figure 11, in the i-th time period, the sector sweep reference signal is transmitted from the same transmitting panel antenna regardless of the frequency band. In this case, in the first time period, the same beamforming parameters are used regardless of the frequency band. Beamforming will be explained later.

[0269] Fig. 12 shows an example of the configuration of the "sector sweep reference signal 1101_pi in the transmitting panel antenna i for frequency ♭p" in Fig. 11. In Fig. 12, the horizontal axis represents time. Note that p is an integer between 1 and K, and i is an integer between 1 and M.

[0270] A specific example of the transmission method of the "sector sweep reference signal 1101_pi at the transmitting panel antenna i for frequency ♭p" configured in Figures 11 and 12, which is transmitted by base station #1 of 901_1 having the configuration of Figures 1A, 1B, and 1C, has already been explained, so the explanation will be omitted.

[0271] As shown in Figures 11 and 12, when base station #1 of 901_1 transmits a "reference signal 1101_i for sector sweep at transmitting panel antenna i for frequency ♭p," the "reference signal 1201_j based on the jth parameter at transmitting panel antenna i for frequency ♭p" is assumed to include, for example, the following information:

[0272] - ID (identification) of the transmitting panel antenna (here, for example, corresponds to i) Identification number (ID) of the parameter used in beamforming (directivity control) (here, for example, corresponds to j)

[0273] When a terminal transmits a sector sweep reference signal, the number of frequency divisions that can be used to transmit the sector sweep reference signal (this will be explained later).

[0274] However, if the "number of frequency divisions in which a reference signal for sector sweep can be transmitted" is predetermined, the information on the number of frequency divisions in which a reference signal for sector sweep can be transmitted does not need to be included in the "reference signal 1201_j based on the jth parameter in the transmitting panel antenna i for frequency ♭p."

[0275] Note that the "reference signal 1201_j based on the j-th parameter in the transmitting panel antenna i for frequency ♭p" may include other information. Examples of such information will be described in other embodiments, for example, in the sixth embodiment and onward.

[0276] Furthermore, the "reference signal 1201_j based on the j-th parameter in the transmitting panel antenna i for frequency ♭p" may include the following information.

[0277] Information about the frequency band and / or frequency ♭p (which may include information about the number of frequency divisions) (This will be explained later.)

[0278] By base station #1 of 901_1 transmitting the "ID (identification) of the transmitting panel antenna for frequency ♭p" and the "ID of the parameter used in beamforming (directional control)", the terminal can know the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directional control)" that it was able to receive, and base station #1 of 901_1 and the terminal can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0279] It should be noted that the "number of frequency divisions that a terminal can use to transmit a sector sweep reference signal when transmitting the sector sweep reference signal" may be changeable depending on the frame and / or time, etc. This has the effect of improving the data transmission efficiency of the communication system.

[0280] Furthermore, by base station #1 of 901_1 transmitting "information regarding the frequency band and / or frequency ♭p," the terminal obtains this information, and by transmitting "frequency-related information that the terminal wants the base station to transmit" to the base station, the base station can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0281] Next, an explanation will be given of the operation in the time interval from time t1 to t2, which is the terminal response interval in Fig. 10. In this sixth embodiment, an explanation will be given taking as an example a case where the terminal uses a multicarrier system such as OFDM, and the frequencies (bands) used by the base station and the frequencies (bands) used by the terminal partially contain the same frequencies (bands).

[0282] Fig. 21 shows an example of operation in the time interval from time t1 to t2, which is the terminal response interval. In Fig. 21, the horizontal axis represents time. Terminals such as terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6 in Fig. 9 transmit sector sweep reference signals in the time interval from time t1 to t2, which is the terminal response interval. In Fig. 21, the same numbers are used for components that operate in the same way as in Fig. 10.

[0283] 10 and 21, for example, it is assumed that base station #1 of 901_1 transmits a sector sweep reference signal in the time interval from time t0 to t1. After that, it is assumed that a "sector sweep reference signal" x2701_1 for the terminal exists in the terminal response period, which is the time interval from time t1 to t2, as shown in FIG.

[0284] Fig. 22A shows an example of the time-frequency configuration of the "sector sweep reference signal" x2701_1 for the terminal shown in Fig. 21. In Fig. 22A, the horizontal axis represents time and the vertical axis represents frequency.

[0285] As shown in Figure 22A, the ``terminal's ``sector sweep reference signal'' x2701_1 has the following areas: ``sector sweep reference signal'' x2801_1 for frequency ♭1, ``sector sweep reference signal'' x2801_2 for frequency ♭2, ``sector sweep reference signal'' x2801_3 for frequency ♭3, ``sector sweep reference signal'' x2801_4 for frequency ♭4, ``sector sweep reference signal'' x2801_5 for frequency ♭5, ``sector sweep reference signal'' x2801_6 for frequency ♭6, ``sector sweep reference signal'' x2801_7 for frequency ♭7, ..., ``sector sweep reference signal'' x2801_K for frequency ♭K.

[0286] Therefore, in the case of FIG. 22A, the base station #1 of 901_1 sets the "number of frequency divisions that can transmit a sector sweep reference signal when a terminal transmits a sector sweep reference signal" to K.

[0287] Figure 22B shows an example of terminal occupation of the areas of the "sector sweep reference signal" x2701_1 for the terminal shown in Figure 21A, including the "sector sweep reference signal" x2801_1 for frequency ♭1, the "sector sweep reference signal" x2801_2 for frequency ♭2, the "sector sweep reference signal" x2801_3 for frequency ♭3, the "sector sweep reference signal" x2801_4 for frequency ♭4, the "sector sweep reference signal" x2801_5 for frequency ♭5, the "sector sweep reference signal" x2801_6 for frequency ♭6, the "sector sweep reference signal" x2801_7 for frequency ♭7, ..., the "sector sweep reference signal" x2801_K for frequency ♭K. In Figure 22A, the horizontal axis represents time and the vertical axis represents frequency.

[0288] Terminal #1 902_1 in Fig. 9 receives sector sweep reference signal 1001 transmitted by base station #1 901_1, and estimates the "frequency band, transmitting panel antenna, and parameter number" with the best reception quality among the transmitting panel antennas of base station #1 901_1. This estimation can be performed by obtaining sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" contained therein. Alternatively, "information related to the frequency band and / or frequency ♭p" contained in sector sweep reference signal 1001 may be used.

[0289] It is assumed that terminal #1 of 902_1 has estimated that the "transmitting panel antenna and parameters" with the best reception quality are, for example, "transmitting panel antenna a1 and parameters b1." Furthermore, it is assumed that terminal #1 of 902_1 has estimated that the "frequency domain" with the best reception quality is frequency band ♭K. Additionally, terminal #1 of 902_1 may estimate the frequency domain with the second best reception quality, the frequency domain with the third best reception quality, etc. Note that, for simplicity of explanation, the frequency domain with the best reception quality is considered here.

[0290] Furthermore, terminal #1 of 902_1 may estimate the "transmitting panel antenna and parameters" with good reception quality and at the same time obtain information on "the number of frequency divisions in which a reference signal for a sector sweep can be transmitted when the terminal transmits the reference signal for a sector sweep." In the case of Fig. 22B, terminal #1 of 902_1 may obtain information that "the number of frequency divisions in which a reference signal for a sector sweep can be transmitted when the terminal transmits the reference signal for a sector sweep" is K.

[0291] Then, based on the above result, for example, terminal #1 of 902_1 transmits terminal #1 "sector sweep reference signal" x2811_1 using frequency band ♭K. However, although the example described here is that terminal #1 of 902_1 uses "frequency band ♭K" that is estimated to have the best reception quality, a frequency band other than the frequency band that is estimated to have the best reception quality may be used.

[0292] It is assumed that the "sector sweep reference signal" x2811_1 of terminal #1 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #1 of 902_1, i.e., information on the "transmitting panel antenna a1 and parameters b1." It is also assumed that the "sector sweep reference signal" x2811_1 of terminal #1 includes information on the "frequency domain," for example, information on the "frequency band ♭K." This point will be explained later.

[0293] Similarly, terminal #2 902_2 in Fig. 9 receives sector sweep reference signal 1001 transmitted by base station #1 901_1, and estimates the "frequency band, transmitting panel antenna, and parameter number" with the best reception quality among the transmitting panel antennas of base station #1 901_1. This estimation can be performed by obtaining sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" contained therein. Alternatively, "information related to the frequency band and / or frequency ♭p" contained in sector sweep reference signal 1001 may be used.

[0294] It is assumed that terminal #2 of 902_2 has estimated that the "transmitting panel antenna and parameters" with the best reception quality are, for example, "transmitting panel antenna a2 and parameters b2." Furthermore, it is assumed that terminal #2 of 902_2 has estimated that the "frequency domain" with the best reception quality is frequency band ♭1. Additionally, terminal #2 of 902_2 may estimate the frequency domain with the second best reception quality, the frequency domain with the third best reception quality, etc. Note that, for simplicity of explanation, the frequency domain with the best reception quality is considered here.

[0295] Furthermore, terminal #2 of 902_2 may estimate the "transmitting panel antenna and parameters" with good reception quality and may also obtain information on "the number of frequency divisions by which a reference signal for a sector sweep can be transmitted when the terminal transmits the reference signal for a sector sweep." In the case of Fig. 22B, terminal #2 of 902_2 may obtain information that "the number of frequency divisions by which a reference signal for a sector sweep can be transmitted when the terminal transmits the reference signal for a sector sweep" is K.

[0296] Then, based on the above result, for example, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" x2811_2 using frequency band ♭1. Here, however, an example is described in which terminal #2 of 902_2 uses "frequency band ♭1" which is estimated to have the best reception quality, but a frequency band other than the frequency band estimated to have the best reception quality may be used.

[0297] It is assumed that the "sector sweep reference signal" x2811_2 for terminal #2 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, i.e., information on the "transmitting panel antenna a2 and parameters b2." The "sector sweep reference signal" x2811_2 for terminal #2 also includes information on the "frequency domain," for example, information on the "frequency band ♭1." This point will be explained later.

[0298] Therefore, terminal #i of 902_i receives sector sweep reference signal 1001 transmitted by base station #1 of 901_1, and estimates the "frequency band, transmitting panel antenna, and parameter number" with the best reception quality among the transmitting panel antennas of base station #1 of 901_1. This estimation can be performed by obtaining sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" contained therein. For example, i is an integer equal to or greater than 1. Alternatively, information on the "frequency band and / or frequency ♭p" contained in sector sweep reference signal 1001 may be used.

[0299] It is assumed that terminal #i of 902_i has estimated that the "transmitting panel antenna and parameters" with good reception quality are, for example, "transmitting panel antenna ai and parameters bi." Furthermore, it is assumed that terminal #i of 902_i has estimated that the "frequency domain" with good reception quality is frequency band ♭zi. It is also possible to specify multiple frequency domains. Additionally, terminal #i of 902_i may estimate the frequency domain with the second best reception quality, the frequency domain with the third best reception quality, etc. It is assumed here that the frequency domain with the best reception quality is considered for simplicity of explanation.

[0300] In addition, terminal #i of 902_i may estimate the "transmitting panel antenna and parameters" with good reception quality and at the same time obtain information on "the number of frequency divisions that can be used to transmit a reference signal for sector sweep when the terminal transmits a reference signal for sector sweep."

[0301] Then, based on the above results, for example, terminal #i of 902_i transmits terminal #i's "sector sweep reference signal" x2811_i using frequency band ♭zi. Here, however, an example is described in which terminal #i of 902_i uses "frequency band ♭zi" that is estimated to have the best reception quality, but a frequency band other than the frequency band estimated to have the best reception quality may also be used.

[0302] It is assumed that the "sector sweep reference signal" 2811_i for terminal #i includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #i of 902_i, i.e., information on the "transmitting panel antenna ai and parameters bi." It is also assumed that the "sector sweep reference signal" x2811_i for terminal #i includes information on the "frequency domain," for example, information on the "frequency band ♭zi." This point will be explained later.

[0303] In FIG. 21, if the frequency (band) used by sector sweep reference signal 1001 transmitted by base station #1 of 901_1 is the same as the frequency (band) used by the "sector sweep reference signal for terminal" x2701_1 transmitted by terminal #i, the "sector sweep reference signal" x2811_i for terminal #i does not need to include information on the "frequency domain" (although it may include information). In this case, base station #1 of 901_1 can know the "frequency domain" by looking at the frequency band in which terminal #i's "sector sweep reference signal" x2811_i exists.

[0304] On the other hand, in FIG. 21, if the frequency (band) used by the sector sweep reference signal 1001 transmitted by base station #1 of 901_1 is different from the frequency (band) used by the "terminal sector sweep reference signal" x2701_1 transmitted by terminal #i, the "sector sweep reference signal" x2811_i for terminal #i includes information on the "frequency domain," thereby achieving the effect of more accurately transmitting information on the "frequency domain" to base station #1 of 901_1.

[0305] The configuration of the terminal #i "sector sweep reference signal" x2811_i transmitted by terminal #i of 902_i, which was explained using FIG. 22B, will be described. For simplicity of explanation, terminal #i of 902_i is assumed to have the configurations shown in FIGS. 1A, 1B, and 1C. Furthermore, terminal #i of 902_i having the configurations shown in FIGS. 1A, 1B, and 1C is assumed to have the configuration shown in FIG. 3 as the transmitting panel antenna xi of 106_xi. However, the configuration of terminal #i of 902_i is not limited to the configurations shown in FIGS. 1A, 1B, and 1C, and the configuration of the transmitting panel antenna xi of 106_xi of terminal #i of 902_i having the configurations shown in FIGS. 1A, 1B, and 1C is not limited to that shown in FIG. 3.

[0306] Terminal #i of 902_i transmits terminal #i "sector sweep reference signal" x2811_i as shown in FIG. 22B. FIG. 15A shows an example of the configuration of terminal #i "sector sweep reference signal" x2811_i. Note that in FIG. 15A, the horizontal axis represents time. Furthermore, "terminal #i "sector sweep reference signal" 1401_i" in FIG. 15A corresponds to an example of "sector sweep reference signal" x2811_i in FIG. 22B.

[0307] As shown in Figure 15A, the "sector sweep reference signal" x2811_i of terminal #i of 902_i is composed of "sector sweep reference signal 1501_1 at terminal #i transmitting panel antenna 1, sector sweep reference signal 1501_2 at terminal #i transmitting panel antenna 2, ..., sector sweep reference signal 1501_M at terminal #i transmitting panel antenna M."

[0308] For example, terminal #i 902_i having the configuration of FIGS. 1A, 1B, and 1C transmits "sector sweep reference signal 1501_1 in transmission panel antenna 1 of terminal #i" using transmission panel antenna 1 106_1.

[0309] 1A, 1B, and 1C, terminal #i of 902_i transmits "sector sweep reference signal 1501_k at transmission panel antenna k of terminal #i" using transmission panel antenna k of 106_k, where k is an integer between 1 and M.

[0310] In FIG. 15A, the number of transmitting panel antennas possessed by terminal #i of 902_i is set to M, but this is not limited thereto, and the number of transmitting panel antennas may be set to N (N is an integer equal to or greater than 1).

[0311] Details are also explained in other embodiments.

[0312] Fig. 15B shows an example of the configuration of "sector sweep reference signal 1501_xi in transmission panel antenna xi of terminal #i" in Fig. 15A. Note that in Fig. 15, the horizontal axis represents time.

[0313] As shown in FIG. 15B, the "reference signal 1501_xi for sector sweep at the transmitting panel antenna xi of terminal #i" is assumed to be composed of, for example, "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi," "reference signal 1511_2 based on the second parameter at the transmitting panel antenna xi," "reference signal 1511_3 based on the third parameter at the transmitting panel antenna xi," and "reference signal 1511_4 based on the fourth parameter at the transmitting panel antenna xi."

[0314] For example, it is assumed that the terminal #i of 902_i having the configuration of FIGS. 1A, 1B, and 1C has the configuration of FIG. 3 as the transmitting panel antenna xi of 106_xi.

[0315] The "reference signal 1511_1 based on the first parameter in the transmitting panel antenna xi" will be described.

[0316] When terminal #i of 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_1 at transmitting panel antenna xi of 106_xi to w1(xi,1). If first transmission signal 303_1 in "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" is tx1ref1(t), multiplier 304_1 obtains tx1ref1(t)×w1(xi,1). Then, terminal #i of 902_i transmits tx1ref1(t)×w1(xi,1) from antenna 306_1 of FIG. 3, where t is time.

[0317] When terminal #i of 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna xi of 106_xi to w2(xi,1). If second transmission signal 303_2 in "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" is tx2ref1(t), multiplier 304_2 obtains tx2ref1(t)×w2(xi,1). Then, terminal #i of 902_i transmits tx2ref1(t)×w2(xi,1) from antenna 306_2 of FIG. 3.

[0318] When terminal #i of 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna xi of 106_xi to w3(xi,1). If third transmission signal 303_3 in "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" is tx3ref1(t), multiplier 304_3 obtains tx3ref1(t) × w3(xi,1). Then, terminal #i of 902_i transmits tx3ref1(t) × w3(xi,1) from antenna 306_3 of FIG. 3.

[0319] When terminal #i of 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of 106_xi to w4(xi,1). If fourth transmission signal 303_4 in "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" is tx4ref1(t), multiplier 304_4 obtains tx4ref1(t) × w4(xi,1). Then, terminal #i of 902_i transmits tx4ref1(t) × w4(xi,1) from antenna 306_4 of FIG. 3.

[0320] The "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" will be described.

[0321] When terminal #i of 902_i transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_1 at transmitting panel antenna xi of 106_xi to w1(xi,j). If first transmission signal 303_1 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" is tx1refj(t), multiplier 304_1 obtains tx1refj(t)×w1(xi,j). Then, terminal #i of 902_i transmits tx1refj(t)×w1(xi,j) from antenna 306_1 of FIG. 3, where t is time.

[0322] When terminal #i of 902_i transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna x i" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna x i of 106_x i to w2(x i,j). If second transmission signal 303_2 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna x i" is tx2refj(t), multiplier 304_2 obtains tx2refj(t)×w2(x i,j). Then, terminal #i of 902_i transmits tx2refj(t)×w2(x i,j) from antenna 306_2 of FIG. 3.

[0323] When terminal #i of 902_i transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna x i" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna x i of 106_x i to w3(x i,j). If third transmission signal 303_3 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna x i" is tx3refj(t), multiplier 304_3 obtains tx3refj(t)×w3(x i,j). Then, terminal #i of 902_i transmits tx3refj(t)×w3(x i,j) from antenna 306_3 of FIG. 3.

[0324] When terminal #i of 902_i transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of 106_xi to w4(xi,j). If fourth transmission signal 303_4 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" is tx4refj(t), multiplier 304_4 obtains tx4refj(t)×w4(xi,j). Then, terminal #i of 902_i transmits tx4refj(t)×w4(xi,j) from antenna 306_4 of FIG. 3.

[0325] In the case of Fig. 15B, j is an integer greater than or equal to 1 and less than or equal to 4. In Fig. 15B, the number of parameter changes Z is set to Z=4, but the number of parameter changes Z is not limited to 4, and can be implemented in the same way as long as Z is an integer greater than or equal to 1 or an integer greater than or equal to 2. In this case, j is an integer greater than or equal to 1 and less than or equal to Z.

[0326] As shown in Figures 22B, 15A, and 15B, when terminal #i of 902_i transmits a "reference signal 1501_xi for sector sweep at terminal #i's transmitting panel antenna xi," the "reference signal 1511_j based on the jth parameter at transmitting panel antenna xi" is assumed to include, for example, the following information:

[0327] As mentioned above, information on the "transmitting panel antenna and parameters" of base station #1 of 901_1, which has good reception quality.

[0328] Therefore, terminal #i of 902_i will transmit "information on the transmitting panel antenna and parameters of base station #1 of 901_1 with good reception quality" in "reference signal 1501_1 for sector sweep at terminal #i transmitting panel antenna 1," "reference signal 1501_2 for sector sweep at terminal #i transmitting panel antenna 2," ..., "reference signal 1501_M for sector sweep at terminal #i transmitting panel antenna M" in Figure 15A.

[0329] Furthermore, in the "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi," "reference signal 1511_2 based on the second parameter at transmitting panel antenna xi," "reference signal 1511_3 based on the third parameter at transmitting panel antenna xi," and "reference signal 1511_4 based on the fourth parameter at transmitting panel antenna xi" in Figure 15B of "reference signal 1501_1 for sector sweep at transmitting panel antenna 1 of terminal #i," "reference signal 1501_2 for sector sweep at transmitting panel antenna 2 of terminal #i," ..., "reference signal 1501_M for sector sweep at transmitting panel antenna M of terminal #i" in Figure 15A, terminal #i of 902_i will transmit "information on the transmitting panel antenna and parameters" of base station #1 of 901_1 with good reception quality."

[0330] In this case, even if the base station #1 of 901_1 uses, for example, an omni-antenna, it is highly likely that it can receive any of the "sector sweep reference signal 1501_1 at the transmitting panel antenna 1 of terminal #i," "sector sweep reference signal 1501_2 at the transmitting panel antenna 2 of terminal #i," ..., "sector sweep reference signal 1501_M at the transmitting panel antenna M of terminal #i" in FIG. 15A transmitted by the terminal #i of 902_i. This is because the terminal #i of 902_i is performing transmit beamforming (directivity control). This has the effect of increasing the likelihood that the base station #1 of 901_1 can obtain "information on the transmitting panel antenna and parameters of the base station #1 of 901_1 with good reception quality" transmitted by the terminal #i of 902_i. Therefore, the base station #1 of 901_1 can transmit a modulated signal to the terminal #i of 902_i based on the "information on the transmitting panel antenna and parameters" of the base station #1 of 901_1 with good reception quality, and the terminal #i of 902_i can receive the modulated signal with high reception quality.

[0331] In addition, as shown in Figure 22B, when multiple terminals are transmitting reference signals for sector sweep, base station #1 of 901_1 can obtain information on the ``transmitting panel antenna and parameters'' of base station #1 of 901_1 with good reception quality from the multiple terminals, thereby allowing base station #1 of 901_1 to transmit modulated signals to the multiple terminals based on the ``information on the ``transmitting panel antenna and parameters'' of base station #1 of 901_1 with good reception quality'' from the multiple terminals, and the multiple terminals can receive the modulated signals with high reception quality.

[0332] Also, as shown in Figures 22B, 15A, and 15B, when terminal #i of 902_i transmits a "reference signal 1501_xi for sector sweep at terminal #i's transmitting panel antenna xi," the "reference signal 1511_j based on the jth parameter at transmitting panel antenna xi" may include, for example, the following information:

[0333] - ID (identification) of the transmitting panel antenna (here, for example, corresponds to Xi) Identification number (ID) of the parameter used in beamforming (directivity control) (here, for example, corresponds to j)

[0334] When terminal #i of 902_i transmits the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)", base station #1 of 901_1 can know the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" that it was able to receive, and terminal #i of 902_i and base station #1 of 901_1 can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0335] It should be noted that the "reference signal 1511_j based on the j-th parameter in the transmitting panel antenna xi" may include other information.

[0336] As shown in Figures 22B, 15A, and 15B, when terminal #i of 902_i transmits a "reference signal 1501_xi for sector sweep at terminal #i's transmitting panel antenna xi," the "reference signal 1511_j based on the jth parameter at transmitting panel antenna xi" may include, for example, the following information:

[0337] "Information about the frequency band and / or frequency ♭p that terminal #i of 902_i has used for transmission or wants base station #1 of 901_1 to use"

[0338] When terminal #i of 902_i transmits the "information regarding the frequency band and / or frequency ♭p," base station #1 of 901_1 can know the "information regarding the frequency band and / or frequency ♭p," and terminal #i of 902_i and base station #1 of 901_1 can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0339] Figure 23A shows an example of the configuration of feedback signal 1002 transmitted by base station #1 of 901_1, which exists in the time interval from t2 to t3 in Figure 10. In Figure 23A, the horizontal axis represents time and the vertical axis represents frequency. In this example, as shown in Figure 23A, feedback signal 1002 has regions of "feedback signal x2901_1 for frequency ♭1, feedback signal x2901_2 for frequency ♭2, feedback signal x2901_3 for frequency ♭3, feedback signal x2901_4 for frequency ♭5, feedback signal x2901_5 for frequency ♭6, feedback signal x2901_7 for frequency ♭7, ..., feedback signal x2901_K for frequency ♭K."

[0340] Figure 23B shows an example of specific feedback signal allocation to the regions of "feedback signal x2901_1 for frequency ♭1, feedback signal x2901_2 for frequency ♭2, feedback signal x2901_3 for frequency ♭3, feedback signal x2901_4 for frequency ♭4, feedback signal x2901_5 for frequency ♭5, feedback signal x2901_6 for frequency ♭6, feedback signal x2901_7 for frequency ♭7, ..., feedback signal x2901_K for frequency ♭K" of feedback signal 1002 shown in Figure 23A.

[0341] For example, as shown in FIG. 22B, terminal #1 of 902_1 transmits terminal #1 "sector sweep reference signal" x2811_1, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" x2811_2, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" x2811_3, and other terminals also transmit sector sweep reference signals.

[0342] Then, based on the "sector sweep reference signal" x2811_1 of terminal #1, base station #1 of 901_1 transmits a feedback signal x2911_1 addressed to terminal #1 using frequency band ♭K, as shown in FIG. 23B.

[0343] Based on the "sector sweep reference signal" x2811_2 of terminal #2, base station #1 of 901_1 transmits a feedback signal x2911_2 addressed to terminal #2 using frequency band ♭1, as shown in FIG. 23B.

[0344] Based on the "sector sweep reference signal" x2811_3 of terminal #3, base station #1 of 901_1 transmits a feedback signal x2911_3 addressed to terminal #3 using frequency bands ♭2 and ♭3, as shown in FIG. 23B.

[0345] Based on the "sector sweep reference signal" x2811_4 of terminal #4, base station #1 of 901_1 transmits a feedback signal x2911_4 addressed to terminal #4 using frequency band ♭6, as shown in FIG. 23B.

[0346] Based on the "sector sweep reference signal" x2811_5 of terminal #5, base station #1 of 901_1 transmits a feedback signal x2911_5 addressed to terminal #5 using frequency band ♭4, as shown in FIG. 23B.

[0347] Based on the "sector sweep reference signal" x2811_6 of terminal #6, base station #1 of 901_1 transmits a feedback signal x2911_6 addressed to terminal #6 using frequency band ♭7, as shown in FIG. 23B.

[0348] In this way, terminal #i of 902_i can know that communication with base station #1 of 901_1 has become possible by receiving feedback signal x2911_i addressed to terminal #i, and can also know the frequency band to be used. Note that Fig. 23B is merely an example, and for example, if feedback signal x2911_1 addressed to terminal #1 does not exist as feedback signal 1002, terminal #1 of 902_1 will know that communication with base station #1 of 901_1 has not been established.

[0349] At this time, the feedback signal 2911_i addressed to terminal #i is assumed to include, for example, information indicating that communication with terminal #i of 902_i is possible (or that frame 1003 including data symbols in FIG. 10 includes symbols addressed to terminal #i of 902_i).

[0350] Furthermore, based on the "information on the 'transmitting panel antenna and parameters' of the base station #1 of 901_1 with good reception quality" transmitted by the terminal #i of 902_i, the base station #1 of 901_1 selects a frequency (band) and a transmitting panel antenna, sets beamforming parameters, and transmits a feedback signal x2911_i addressed to the terminal #i. The feedback signal x2911_i may include the "information on the 'frequency (band)' of the base station #1 of 901_1 with good reception quality" transmitted by the terminal #i of 902_i.

[0351] Figure 24A shows an example of the configuration of frame 1003, which includes data symbols transmitted by base station #1 of 901_1 and exists in the time interval from t4 to t5 in Figure 10. In Figure 24A, the horizontal axis represents time and the vertical axis represents frequency. In this example, as shown in Figure 24A, frame 1003 including data symbols includes the following regions: "modulated signal (slot) x3001_1 for frequency ♭1, modulated signal (slot) x3001_2 for frequency ♭2, modulated signal (slot) x3001_3 for frequency ♭3, modulated signal (slot) x3001_4 for frequency ♭5, modulated signal (slot) x3001_5 for frequency ♭6, modulated signal (slot) x3001_7 for frequency ♭7, ..., modulated signal (slot) x3001_K for frequency ♭K."

[0352] Figure 24B shows an example of specific modulation signal (slot) allocation for the areas of "modulation signal (slot) x3001_1 for frequency ♭1, modulation signal (slot) x3001_2 for frequency ♭2, modulation signal (slot) x3001_3 for frequency ♭3, modulation signal (slot) x3001_4 for frequency ♭4, modulation signal (slot) 3001_5 for frequency ♭5, modulation signal (slot) x3001_6 for frequency ♭6, modulation signal (slot) x3001_7 for frequency ♭7, ..., modulation signal (slot) x3001_K for frequency ♭K" of frame 1003 including the data symbol shown in Figure 24A.

[0353] For example, as shown in FIG. 22B, terminal #1 of 902_1 transmits terminal #1 "sector sweep reference signal" x2811_1, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" x2811_2, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" x2811_3, and other terminals also transmit sector sweep reference signals.

[0354] Then, based on the "sector sweep reference signal" x2811_1 of terminal #1, base station #1 of 901_1 transmits a modulated signal (slot) x3011_1 addressed to terminal #1 using frequency band ♭K, as shown in FIG. 24B.

[0355] Based on the "sector sweep reference signal" x2811_2 of terminal #2, base station #1 of 901_1 transmits modulated signal (slot) x3011_2 addressed to terminal #2 using frequency band ♭1, as shown in FIG. 24B.

[0356] Based on the "sector sweep reference signal" 2811_3 for terminal #3, base station #1 of 901_1 transmits modulated signal (slot) x3011_3 addressed to terminal #3 using frequency bands ♭2 and ♭3, as shown in FIG. 24B.

[0357] Based on the "sector sweep reference signal" 2811_4 for terminal #4, base station #1 of 901_1 transmits modulated signal (slot) x3011_4 addressed to terminal #4 using frequency band ♭6, as shown in FIG. 24B.

[0358] Based on the "sector sweep reference signal" 2811_5 of the terminal #5, the base station #1 of 901_1 transmits a modulated signal (slot) x3011_5 addressed to the terminal #5 using the frequency band ♭4, as shown in FIG. 24B.

[0359] Based on the "sector sweep reference signal" 2811_6 for terminal #6, base station #1 of 901_1 transmits modulated signal (slot) x3011_6 addressed to terminal #6 using frequency band ♭7, as shown in FIG. 24B.

[0360] At this time, it is assumed that modulated signal (slot) x3011_i addressed to terminal #i includes, for example, data symbols (data, information) addressed to terminal #i of 902_i.

[0361] In this way, terminal #i of 902_i can know that communication with base station #1 of 901_1 has become possible through modulated signal (slot) x3011_i addressed to terminal #i, and can also know the frequency band to be used. Note that Fig. 24B is merely an example, and for example, if modulated signal (slot) x3011_i addressed to terminal #1 does not exist as frame 1003 including a data symbol, terminal #1 of 902_1 will know that communication with base station #1 of 901_1 has not been established.

[0362] Based on the "information on the 'transmitting panel antenna and parameters' of the base station #1 of 901_1 with good reception quality" transmitted by the terminal #i of 902_i, the base station #1 of 901_1 selects a frequency (band) and a transmitting panel antenna, sets beamforming parameters, and transmits a modulated signal (slot) x3011_i addressed to the terminal #i. The signal may include the "information on the 'frequency (band)' of the base station #1 of 901_1 with good reception quality" transmitted by the terminal #i of 902_i.

[0363] In addition, in Figures 23A and 23B, base station #1 of 901_1 receives the ``sector sweep reference signal'' x2811_i transmitted by terminal #i of 902_i for terminal #i, and estimates the ``frequency (band)'' and ``transmitting panel antenna and parameters'' of terminal #i of 902_1 with good reception quality, and this information may be included in the feedback signal x2911_i addressed to terminal #i.

[0364] As a result, terminal #i of 902_i selects a frequency (band) and a transmitting panel antenna based on information on the "frequency (band)," "transmitting panel antenna, and parameters" of terminal #i of 902_i with good reception quality obtained from base station #1 of 901_1, determines a beamforming method, and transmits symbols, frames, and / or modulated signals to base station #1 of 901_1, thereby achieving the effect of improving the reception quality of data at base station #1 of 901_1.

[0365] Also, in the time period from t3 to t4 in Figure 10, terminal #i of 902_i may transmit a modulated signal to base station #1 of 901_1 including information such as an ACK (acknowledgement) indicating that the signal from base station #1 of 901_1 has been received.

[0366] 24B may include, in addition to data symbols, reference signals such as DMRS (demodulation reference signal), PTRS (phase tracking reference signal), and SRS (sounding reference signal), pilot symbols, pilot signals, preambles, and symbols containing control information. Possible symbols containing control information include information about the destination terminal (an ID that can identify the terminal), a modulation signal transmission method, modulation scheme information, error correction coding scheme (code length, coding rate, etc.), and MCS (Modulation and Coding Scheme) information.

[0367] 18 shows an example of a situation when the base station #1 of 901_1 and "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" are communicating as in FIG. 9. FIG. 18(A) shows an example of a transmission situation of a modulated signal of the base station #1 of 901_1, and FIG. 18(B) shows an example of a transmission situation of a modulated signal of "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6". In FIG. 18(A) and FIG. 18(B), the horizontal axis represents time.

[0368] First, the base station #1 of 901_1 transmits a sector sweep reference signal 1801_1. Note that this point has already been explained with reference to FIG. 10, so the explanation will be omitted.

[0369] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit sector sweep reference signals 1851_1. Note that this point has already been explained using FIG. 21, FIG. 22A, FIG. 22B, FIG. 15A, FIG. 15B, etc.

[0370] The base station #1 of 901_1 transmits a feedback signal 1802_1. Note that this point has already been explained using Figs. 23A and 23B, so the explanation will be omitted.

[0371] Thereafter, base station #1 of 901_1 transmits "frame 1803_1 including data symbols." Note that this point has already been explained using FIGS. 24A and 24B, so the explanation will be omitted. (Therefore, "frame 1803_1 including data symbols" is considered to be, for example, a frame for downlink.)

[0372] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit "frame 1852_1 including data symbols." The configuration of this frame will be explained later with reference to Figures 25A, 25B, 25C, 25D, 25E, and 25F. (Therefore, "frame 1852_1 including data symbols" is considered to be, for example, a frame for uplink.)

[0373] Next, the base station #1 of 901_1 transmits a "frame 1803_2 including a data symbol." Note that the method of configuring the "frame 1803_2 including a data symbol" is as described with reference to Figs. 24A and 24B.

[0374] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit "frame 1852_2 including data symbols." Note that the configuration of this frame will be described later with reference to Figures 25A, 25B, 25C, 25D, 25E, and 25F.

[0375] Figure 19 shows an example of the transmission status of modulated signals from base station #1 of 901_1 in Figure 18 onwards and the transmission status of modulated signals from terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6".

[0376] FIG. 19(A) shows an example of a transmission status of a modulated signal from the base station #1 of 901_1, which is a continuation in time of the transmission status of a modulated signal from the base station #1 of 901_1 of FIG. 18(A).

[0377] Figure 19(B) shows an example of the transmission status of modulated signals of "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6," and is a temporal continuation of the transmission status of modulated signals of "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" in Figure 18(B).

[0378] In addition, in FIGS. 19(A) and 19(B), the horizontal axis represents time.

[0379] 18(A) and 18(B), the base station #1 of 901_1 transmits a "frame 1803_3 including a data symbol." The method of configuring the "frame 1803_3 including a data symbol" is as described with reference to FIGS. 24A and 24B.

[0380] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit "frame 1852_3 including data symbol." Note that the configuration of this frame will be explained later with reference to Figures 25A, 25B, 25C, 25D, 25E, and 25F.

[0381] Next, the base station #1 of 901_1 transmits a sector sweep reference signal 1801_2. Note that this point has already been explained with reference to FIG.

[0382] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit sector sweep reference signals 1851_2. Note that this point has already been explained using Fig. 21, Fig. 22A, Fig. 22B, Fig. 15A, Fig. 15B, etc., so explanation will be omitted.

[0383] The base station #1 of 901_1 transmits a feedback signal 1802_2. Note that this point has already been explained using Figs. 23A and 23B, so the explanation will be omitted.

[0384] Thereafter, the base station #1 of 901_1 transmits a "frame 1803_4 including a data symbol." Note that this point has already been explained using Figs. 24A and 24B, so the explanation will be omitted.

[0385] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" transmit "frame 1852_4 including data symbol." Note that the configuration of this frame will be explained later with reference to Figures 25A, 25B, 25C, 25D, 25E, and 25F.

[0386] In this way, before "transmission of a 'frame including data symbols' by base station #1 of 901_1 and / or transmission of a 'frame including data symbols' by terminals such as terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6," base station #1 of 901_1 and the terminals transmit a sector sweep reference signal, and "transmission of a 'frame including data symbols' by base station #1 of 901_1 and / or transmission of a 'frame including data symbols' by terminals such as terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" And / or, after "transmission of a frame including a data symbol" from terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6," the base station and / or terminals can obtain the effect of obtaining high data reception quality by again transmitting a sector sweep reference signal and setting the frequency (band), selecting the transmitting panel antenna to be used, and setting the transmitting beamforming.

[0387] Next, a configuration example of "frame 1852_i including data symbol" transmitted by terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" will be described with reference to Figures 25A, 25B, 25C, 25D, 25E, and 25F. Note that, for example, i is an integer equal to or greater than 1, and in Figures 25A, 25B, 25C, 25D, 25E, and 25F, the horizontal axis represents time and the vertical axis represents frequency.

[0388] As shown in Figures 25A, 25B, 25C, 25D, 25E, and 25F, in "frame 1852_i including data symbols", frequency bands ♭1, ♭2, ♭3, ♭4, ♭5, ♭6, ♭7, ..., and ♭K exist.

[0389] Figure 25A shows the appearance of a "frame including a data symbol" 1852_i transmitted by terminal #1 of 902_1, and as shown in Figure 25A, terminal #1 of 902_1 transmits "terminal #1 transmission frame x3111_1 (including a data symbol)" using frequency band ♭K.

[0390] Figure 25B shows the "frame including data symbols" 1852_i transmitted by terminal #2 of 902_2, and as shown in Figure 25B, terminal #2 of 902_2 transmits "terminal #2 transmission frame x3111_2 (including data symbols)" using frequency band ♭1.

[0391] Figure 25C shows the "frame including data symbols" 1852_i transmitted by terminal #3 of 902_3, and as shown in Figure 25C, terminal #3 of 902_3 transmits "terminal #3 transmission frame x3111_3 (including data symbols)" using frequency bands ♭2 and ♭3.

[0392] Figure 25D shows the "frame including data symbols" 1852_i transmitted by terminal #4 of 902_4, and as shown in Figure 25D, terminal #4 of 902_4 transmits "terminal #4 transmission frame x3111_4 (including data symbols)" using frequency band ♭6.

[0393] Figure 25E shows the "frame including data symbols" 1852_i transmitted by terminal #5 of 902_5, and as shown in Figure 25E, terminal #5 of 902_5 transmits "terminal #5 transmission frame x3111_5 (including data symbols)" using frequency band ♭4.

[0394] Figure 25F shows the "frame including data symbols" 1852_i transmitted by terminal #6 of 902_6, and as shown in Figure 25F, terminal #6 of 902_6 transmits "terminal #6 transmission frame x3111_6 (including data symbols)" using frequency band ♭7.

[0395] In this way, "frame 1852_i including data symbols" transmitted by terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6" is, for example, frequency-divided (here, OFDMA), and each terminal transmits a frame, and base station #1 of 901_1 receives the frame transmitted by each terminal, thereby suppressing interference and achieving high data reception quality.

[0396] In addition, in terminal #1 transmission frame x3111_1, terminal #2 transmission frame x3111_2, terminal #3 transmission frame x3111_3, terminal #4 transmission frame x3111_4, terminal #5 transmission frame x3111_5, and terminal #6 transmission frame x3111_6 in Figures 25A, 25B, 25C, 25D, 25E, and 25F, in addition to data symbols, they may also include, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information.

[0397] 25A, 25B, 25C, 25D, 25E, and 25F illustrate cases where a frame transmitted by a terminal is frequency-divided, but the frame transmitted by a terminal may also be spatially divided using MU-MIMO (Multi User-MIMO (Multiple-Input Multiple-Output)).

[0398] In this embodiment, as an example, a case is described in which the frequency (band) of the signal transmitted by the base station and the frequency (band) of the signal transmitted by the terminal are the same or partially the same, but it is also possible to implement the same in a case in which the frequency (band) of the signal transmitted by the base station and the frequency (band) of the signal transmitted by the terminal are different or partially different.

[0399] Furthermore, in this embodiment, the case where the terminal transmits a modulated signal using a multi-carrier method such as OFDM has been described, but the present invention is not limited to this. For example, when the terminal transmits a signal of a frame such as that shown in Figure 14, Figure 20A, Figure 20B, Figure 20C, Figure 20D, Figure 20E, or Figure 20F, each terminal may transmit a signal using a single-carrier method. For example, in Fig. 14, terminal #1 of 902_1 may transmit terminal #1 "sector sweep reference signal" 1401_1 in frequency band ♭K by single carrier method. Also, in Fig. 20A, terminal #1 of 902_1 may transmit "terminal #1 transmission frame" 2001_1 in frequency band ♭K by single carrier method. Note that other terminals may also transmit signals by single carrier method in the same manner.

[0400] (Embodiment 3) In this third embodiment, a communication system, a communication device, and a communication method using sector sweep when a base station and a terminal perform transmission using a single carrier method will be described. Note that in the following description of the third embodiment, the figures shown in the first embodiment may be used.

[0401] 1A, 1B, and 1C show examples of the configuration of, for example, a base station, an access point, a terminal, a repeater, and a TRP in the third embodiment, and detailed operations have already been explained using Figures 2, 3, 4, 5, 6, 7, and 8, so explanations thereof will be omitted. Also, detailed operations of Figures 2, 3, 4, 5, 6, 7, and 8 have already been explained, so explanations thereof will be omitted.

[0402] For example, examples of single-carrier methods include "DFT (Discrete Fourier Transform)-Spread OFDM (Orthogonal Frequency Division Multiplexing)" (DFT-S OFDM), "Trajectory Constrained DFT-Spread OFDM", "Constrained DFT-Spread OFDM" (Constrained DFT-S OFDM), "OFDM based SC (Single Carrier)", "SC (Single Carrier)-FDMA (Frequency Division Multiple Access)", "Guard interval DFT-Spread OFDM", and time-domain implementation single-carrier methods (e.g., SC (Single Carrier)-QAM).

[0403] Fig. 26 shows an example of a communication state in the fifth embodiment. As shown in Fig. 26, a case is considered in which a base station #1 of 901_1 communicates with a terminal #1 of 902_1, a terminal #2 of 902_2, and a terminal #3 of 902_3. However, the relationship between the base station and the terminals is not limited to this example, and for example, a base station may communicate with one or more terminals.

[0404] In the following, an example will be described in which the base station and terminals perform TDD (Time Division Duplex), TDMA (Time Division Multiple Access), and TDM (Time Division Multiplexing).

[0405] Fig. 10 shows an example of a modulated signal 1000 transmitted by base station #1 901_1 in Fig. 26. In Fig. 10, the horizontal axis represents time. A sector sweep reference signal 1001 exists in the time interval from time t0 to t1. The sector sweep reference signal 1001 will be described later.

[0406] The time period from time t1 to time t2 is a terminal response period. The terminal response will be explained later.

[0407] In the time period from time t2 to time t3, there is a feedback signal 1002. The feedback signal 1002 will be explained later.

[0408] In the time interval from time t4 to time t5, there is a frame 1003 including a data symbol. Note that the frame 1003 including a data symbol will be explained later.

[0409] 10, the signal is called a sector sweep reference signal 1001, but the name is not limited to this and may be called a reference signal, reference symbol, training signal, training symbol, reference signal, reference symbol, etc. Also, the signal is called a feedback signal 1002, but the name is not limited to this and may be called a feedback symbol, a signal addressed to a terminal, a symbol addressed to a terminal, a control signal, a control symbol, etc. And, the signal is called a frame 1003 including a data symbol, but the name is not limited to this and may be called a frame, slot, minislot, unit, etc.

[0410] Fig. 27 shows an example of the sector sweep reference signal 1001 in Fig. 10 transmitted by the base station #1 901_1 in Fig. 26. In Fig. 27, the horizontal axis represents time.

[0411] For example, the base station #1 901_1 having the configuration of FIGS. 1A, 1B, and 1C transmits a sector sweep reference signal x3401_1 for the transmission panel antenna 1 from the transmission panel antenna 106_1.

[0412] 27, base station #1 901_1 having the configurations of FIGS. 1A, 1B, and 1C transmits sector sweep reference signal x3401_i for transmitting panel antenna i from transmitting panel antenna i of 106_i, where i is an integer greater than or equal to 1 and less than or equal to M.

[0413] Fig. 28 shows an example of the configuration of "sector sweep reference signal x3401_i in transmitting panel antenna i" in Fig. 27. In Fig. 28, the horizontal axis represents time.

[0414] For example, it is assumed that the base station #1 901_1 having the configurations of FIGS. 1A, 1B, and 1C has the configuration of FIG. 3 as the transmitting panel antenna i of 106_i.

[0415] The "reference signal x3501_1 based on the first parameter in the transmitting panel antenna i" will be described.

[0416] When base station #1 of 901_1 transmits "reference signal x3501_1 based on the first parameter at transmitting panel antenna i" shown in FIG. 28, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_1 at transmitting panel antenna i of 106_i to w1(i,1). If first transmission signal 303_1 in "reference signal x3501_1 based on the first parameter at transmitting panel antenna i" is tx1ref1(t), multiplier 304_1 obtains tx1ref1(t)×w1(i,1). Then, base station #1 of 901_1 transmits tx1ref1(t)×w1(i,1) from antenna 306_1 of FIG. 3, where t is time.

[0417] When base station #1 of 901_1 transmits "reference signal x3501_1 based on the first parameter at transmitting panel antenna i" shown in FIG. 28, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_2 at transmitting panel antenna i of 106_i to w2(i,1). If second transmission signal 303_2 in "reference signal x3501_1 based on the first parameter at transmitting panel antenna i" is tx2ref1(t), multiplier 304_2 obtains tx2ref1(t)×w2(i,1). Then, base station #1 of 901_1 transmits tx2ref1(t)×w2(i,1) from antenna 306_2 of FIG. 3.

[0418] When base station #1 of 901_1 transmits "reference signal x3501_1 based on the first parameter at transmitting panel antenna i" shown in FIG. 28, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_3 at transmitting panel antenna i of 106_i to w3(i,1). If third transmission signal 303_3 in "reference signal x3501_1 based on the first parameter at transmitting panel antenna i" is tx3ref1(t), multiplier 304_3 obtains tx3ref1(t)×w3(i,1). Then, base station #1 of 901_1 transmits tx3ref1(t)×w3(i,1) from antenna 306_3 of FIG. 3.

[0419] When base station #1 of 901_1 transmits "reference signal x3501_1 based on the first parameter at transmitting panel antenna i" shown in FIG. 28, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_4 at transmitting panel antenna i of 106_i to w4(i,1). If fourth transmission signal 303_4 in "reference signal x3501_1 based on the first parameter at transmitting panel antenna i" is tx4ref1(t), multiplier 304_4 obtains tx4ref1(t)×w4(i,1). Then, base station #1 of 901_1 transmits tx4ref1(t)×w4(i,1) from antenna 306_4 of FIG. 3.

[0420] The "reference signal x3501_j based on the j-th parameter in the transmitting panel antenna i" will be described.

[0421] When base station #1 of 901_1 transmits "reference signal x3501_j based on the j-th parameter at transmitting panel antenna i" shown in FIG. 28, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_1 at transmitting panel antenna i of 106_i to w1(i,j). If first transmission signal 303_1 in "reference signal x3501_j based on the j-th parameter at transmitting panel antenna i" is tx1refj(t), multiplier 304_1 obtains tx1refj(t)×w1(i,j). Then, base station #1 of 901_1 transmits tx1refj(t)×w1(i,j) from antenna 306_1 of FIG. 3, where t is time.

[0422] When base station #1 of 901_1 transmits "reference signal x3501_j by the j-th parameter at transmitting panel antenna i" shown in FIG. 28, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_2 at transmitting panel antenna i of 106_i to w2(i,j). If second transmission signal 303_2 in "reference signal x3501_j by the j-th parameter at transmitting panel antenna i" is tx2refj(t), multiplier 304_2 obtains tx2refj(t)×w2(i,j). Then, base station #1 of 901_1 transmits tx2refj(t)×w2(i,j) from antenna 306_2 of FIG. 3.

[0423] When base station #1 of 901_1 transmits "reference signal x3501_j by the j-th parameter at transmitting panel antenna i" shown in FIG. 28, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_3 at transmitting panel antenna i of 106_i to w3(i,j). If third transmission signal 303_3 in "reference signal x3501_j by the j-th parameter at transmitting panel antenna i" is tx3refj(t), multiplier 304_3 obtains tx3refj(t)×w3(i,j). Then, base station #1 of 901_1 transmits tx3refj(t)×w3(i,j) from antenna 306_3 of FIG. 3.

[0424] When base station #1 of 901_1 transmits "reference signal x3501_j based on the j-th parameter at transmitting panel antenna i" shown in FIG. 28, base station #1 of 901_1 sets the multiplication coefficient in multiplier 304_4 at transmitting panel antenna i of 106_i to w4(i,j). If fourth transmission signal 303_4 in "reference signal x3501_j based on the j-th parameter at transmitting panel antenna i" is tx4refj(t), multiplier 304_4 obtains tx4refj(t)×w4(i,j). Then, base station #1 of 901_1 transmits tx4refj(t)×w4(i,j) from antenna 306_4 of FIG. 3.

[0425] In the case of Fig. 12, j is an integer greater than or equal to 1 and less than or equal to 4. In Fig. 28, the number of parameter changes Z is set to Z=4, but the number of parameter changes Z is not limited to 4, and can be implemented in the same way as long as Z is an integer greater than or equal to 1 or an integer greater than or equal to 2. In this case, j is an integer greater than or equal to 1 and less than or equal to Z.

[0426] As shown in Figures 27 and 28, when base station #1 of 901_1 transmits a "reference signal x3401_i for sector sweep at transmitting panel antenna i," the "reference signal x3501_j based on the jth parameter at transmitting panel antenna i" is assumed to include, for example, the following information:

[0427] - ID (identification) of the transmitting panel antenna (here, for example, corresponds to i) Identification number (ID) of the parameter used in beamforming (directivity control) (here, for example, corresponds to j) When a terminal transmits a sector sweep reference signal, the number of slots in which the terminal can transmit the sector sweep reference signal (the number of terminals that can transmit the sector sweep reference signal) (This will be explained later.)

[0428] Note that the "reference signal x3501_j based on the j-th parameter in the transmitting panel antenna i" may include other information.

[0429] By base station #1 of 901_1 transmitting the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directional control)", the terminal can know the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directional control)" that it was able to receive, and base station #1 of 901_1 and the terminal can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0430] It should be noted that "when a terminal transmits a sector sweep reference signal, the number of slots in which the terminal can transmit the sector sweep reference signal (the number of terminals that can transmit the sector sweep reference signal)" may be changed depending on the frame and / or time, etc. This has the effect of improving the data transmission efficiency of the communication system.

[0431] Next, the operation in the time interval from time t1 to t2, which is the terminal response interval in FIG. 10, will be described.

[0432] Fig. 13 shows an example of operation in the time interval from time t1 to t2, which is the terminal response interval. In Fig. 13, the horizontal axis represents time.

[0433] 10 and 13, for example, it is assumed that base station #1 of 901_1 transmits a sector sweep reference signal in the time interval from time t0 to t1. Thereafter, in the terminal response interval which is the time interval from time t1 to t2, there are a "sector sweep reference signal" transmission interval 1301_1 for the first terminal, a "sector sweep reference signal" transmission interval 1301_2 for the second terminal, a "sector sweep reference signal" transmission interval 1301_3 for the third terminal, and a "sector sweep reference signal" transmission interval 1301_4 for the fourth terminal, as shown in FIG.

[0434] Therefore, in the case of Figure 13, base station #1 of 901_1 sets the number of slots in which a terminal can transmit a reference signal for sector sweep (the number of terminals that can transmit a reference signal for sector sweep) to 4 when transmitting a reference signal for sector sweep.

[0435] Figure 29 shows an example of terminal occupation of "a 'sector sweep reference signal' transmission interval 1301_1 for the first terminal, a 'sector sweep reference signal' transmission interval 1301_2 for the second terminal, a 'sector sweep reference signal' transmission interval 1301_3 for the third terminal, and a 'sector sweep reference signal' transmission interval 1301_4 for the fourth terminal" shown in Figure 13. In Figure 29, the horizontal axis represents time.

[0436] The terminal #1 of 902_1 in Fig. 26 receives the sector sweep reference signal 1001 transmitted by the base station #1 of 901_1, and estimates the "transmitting panel antenna and parameter number" with the best reception quality among the transmitting panel antennas of the base station #1 of 901_1. This estimation can be performed by obtaining the sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" contained therein.

[0437] It is assumed that the terminal #1 of 902_1 has estimated that the "transmitting panel antenna and parameters" with good reception quality are, for example, "transmitting panel antenna a1 and parameters b1."

[0438] Furthermore, terminal #1 of 902_1 estimates the "transmitting panel antenna and parameters" with good reception quality, and at the same time, obtains information on "the number of slots in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal (the number of terminals to which the sector sweep reference signal can be transmitted)." In the case of Fig. 29, terminal #1 of 902_1 obtains information that "the number of slots in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal (the number of terminals to which the sector sweep reference signal can be transmitted)" is 4.

[0439] In this case, terminal #1 of 902_1 uses a random number to obtain, for example, one of the values ​​"0," "1," "2," or "3." For example, assume that terminal #1 of 902_1 obtains "0" using the random number. In this case, since "0" + 1 = 1, terminal #1 of 902_1 transmits sector sweep reference signal x3601_1 using the "sector sweep reference signal" transmission interval 1301_1 for the "first (="0" + 1) terminal" in FIG. 29. Note that here, the transmission interval of the sector sweep reference signal is set using a random number. However, instead of a random number, the transmission interval of the sector sweep reference signal may be set using, for example, a random integer or natural number, an irregular integer or natural number, a regular integer or natural number, an integer or natural number unique to a terminal, or the like. Therefore, setting the transmission interval of the sector sweep reference signal is not limited to the above example. For example, the transmission interval of the sector sweep reference signal may be set for each terminal. This point is also applicable to the following similar explanations.

[0440] It is assumed that the sector sweep reference signal 1401_1 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by the terminal #1 of 902_1, that is, information on the "transmitting panel antenna a1 and parameters b1." This will be explained later.

[0441] Similarly, terminal #2 of 902_2 in Fig. 26 receives sector sweep reference signal 1001 transmitted by base station #1 of 901_1, and estimates the "transmitting panel antenna and parameter number" with the best reception quality among the transmitting panel antennas of base station #1 of 901_1. This estimation can be made by obtaining sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and "ID of the parameter used in beamforming (directivity control)" contained therein.

[0442] It is assumed that the terminal #2 of 902_2 has estimated that the "transmitting panel antenna and parameters" with good reception quality are, for example, "transmitting panel antenna a2 and parameters b2."

[0443] Furthermore, terminal #2 of 902_2 estimates the "transmitting panel antenna and parameters" with good reception quality, and at the same time, obtains information on "the number of slots in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal (the number of terminals to which the sector sweep reference signal can be transmitted)." In the case of Fig. 29, terminal #2 of 902_2 obtains information that "the number of slots in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal (the number of terminals to which the sector sweep reference signal can be transmitted)" is 4.

[0444] In this case, terminal #2 of 902_2 obtains, for example, one of the values ​​"0," "1," "2," or "3" using a random number. For example, terminal #2 of 902_2 obtains "2" using a random number. In this case, since "2" + 1 = 3, terminal #2 of 902_2 transmits sector sweep reference signal x3601_2 using "sector sweep reference signal" transmission interval 1301_3 for the "third (="2" + 1) terminal" in FIG. 29.

[0445] It is assumed that the sector sweep reference signal 1401_2 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, i.e., information on the "transmitting panel antenna a2 and parameters b2." This will be explained later.

[0446] Therefore, terminal #i of 902_i receives sector sweep reference signal 1001 transmitted by base station #1 of 901_1, and estimates the "transmitting panel antenna and parameter number" with the best reception quality among the transmitting panel antennas of base station #1 of 901_1. This estimation can be performed by obtaining sector sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and "ID of the parameter used in beamforming (directivity control)" contained therein. For example, i is an integer equal to or greater than 1.

[0447] It is assumed that terminal #i of 902_i has estimated that the "transmitting panel antenna and parameters" with good reception quality are, for example, "transmitting panel antenna ai and parameters bi."

[0448] Furthermore, terminal #i of 902_i estimates the "transmitting panel antenna and parameters" with good reception quality, and at the same time obtains information on "the number of slots in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal (the number of terminals to which a sector sweep reference signal can be transmitted)." In the case of Fig. 29, terminal #i of 902_i obtains information that "the number of slots in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal (the number of terminals to which a sector sweep reference signal can be transmitted)" is 4.

[0449] In this case, terminal #i of 902_i uses a random number to obtain, for example, one of the values ​​"0," "1," "2," or "3." For example, terminal #i of 902_i uses a random number to obtain "j," where j is one of the values ​​"0," "1," "2," or "3." In this case, terminal #i of 902_i transmits sector sweep reference signal x3601_i using "sector sweep reference signal transmission interval 1301_("j"+1) for terminal ("j"+1)" in FIG. 29.

[0450] It is assumed that the sector sweep reference signal 3601_i includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #i of 902_i, that is, information on the "transmitting panel antenna ai and parameters bi." This will be explained later.

[0451] By doing the above, it is possible to reduce collisions between sector sweep reference signals transmitted by each terminal, thereby increasing the number of sector sweep reference signals that the base station can receive, and thereby increasing the number of terminals with which the base station communicates.

[0452] The configuration of the sector sweep reference signal x3601_i transmitted by terminal #i of 902_i, which was explained using FIG. 29, will be described. For simplicity of explanation, it is assumed that terminal #i of 902_i has the configurations shown in FIGS. 1A, 1B, and 1C. It is also assumed that terminal #i of 902_i having the configurations shown in FIGS. 1A, 1B, and 1C has the configuration shown in FIG. 3 as the transmitting panel antenna xi of 106_xi. However, the configuration of terminal #i of 902_i is not limited to the configurations shown in FIGS. 1A, 1B, and 1C, and the configuration of the transmitting panel antenna xi of 106_xi of terminal #i of 902_i having the configurations shown in FIGS. 1A, 1B, and 1C is not limited to that shown in FIG. 3.

[0453] Fig. 27 shows an example of a sector sweep reference signal x3401_i transmitted by terminal #i of 902_i, where the horizontal axis represents time.

[0454] For example, terminal #i 902_i having the configuration of FIGS. 1A, 1B, and 1C transmits sector sweep reference signal x3401_1 in transmitting panel antenna 1 from transmitting panel antenna 106_1.

[0455] 27, terminal #i of 902_i having the configurations of FIGS. 1A, 1B, and 1C transmits sector sweep reference signal x3401_xi for transmitting panel antenna xi from transmitting panel antenna xi of 106_xi, where xi is an integer greater than or equal to 1 and less than or equal to M.

[0456] Fig. 30 shows an example of the configuration of "sector sweep reference signal x3401_xi in transmitting panel antenna xi" in Fig. 27. In Fig. 30, the horizontal axis represents time.

[0457] For example, it is assumed that the terminal #i of 902_i having the configuration of FIGS. 1A, 1B, and 1C has the configuration of FIG. 3 as the transmitting panel antenna xi of 106_xi.

[0458] The "reference signal x3701_1 based on the first parameter in the transmitting panel antenna xi" will be described.

[0459] When terminal #i of 902_i transmits "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 30, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_1 at transmitting panel antenna xi of 106_xi to w1(xi,1). If first transmission signal 303_1 in "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi" is tx1ref1(t), multiplier 304_1 obtains tx1ref1(t)×w1(xi,1). Then, terminal #i of 902_i transmits tx1ref1(t)×w1(xi,1) from antenna 306_1 of FIG. 3, where t is time.

[0460] When terminal #i of 902_i transmits "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 30, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna xi of 106_xi to w2(xi,1). If second transmission signal 303_2 in "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi" is tx2ref1(t), multiplier 304_2 obtains tx2ref1(t) × w2(xi,1). Then, terminal #i of 902_i transmits tx2ref1(t) × w2(xi,1) from antenna 306_2 of FIG. 3.

[0461] When terminal #i of 902_i transmits "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 30, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna xi of 106_xi to w3(xi,1). If third transmission signal 303_3 in "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi" is tx3ref1(t), multiplier 304_3 obtains tx3ref1(t) × w3(xi,1). Then, terminal #i of 902_i transmits tx3ref1(t) × w3(xi,1) from antenna 306_3 of FIG. 3.

[0462] When terminal #i of 902_i transmits "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 30, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of 106_xi to w4(xi,1). If fourth transmission signal 303_4 in "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi" is tx4ref1(t), multiplier 304_4 obtains tx4ref1(t) × w4(xi,1). Then, terminal #i of 902_i transmits tx4ref1(t) × w4(xi,1) from antenna 306_4 of FIG. 3.

[0463] The "reference signal 3701_j based on the j-th parameter at the transmitting panel antenna xi" will be described.

[0464] When terminal #i of 902_i transmits "reference signal x3701_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 30, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_1 at transmitting panel antenna xi of 106_xi to w1(xi,j). If first transmission signal 303_1 in "reference signal x3701_j based on the j-th parameter at transmitting panel antenna xi" is tx1refj(t), multiplier 304_1 obtains tx1refj(t)×w1(xi,j). Then, terminal #i of 902_i transmits tx1refj(t)×w1(xi,j) from antenna 306_1 of FIG. 3, where t is time.

[0465] When terminal #i of 902_i transmits "reference signal x3701_j based on the j-th parameter at transmitting panel antenna x i" shown in FIG. 30, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna x i of 106_xi to w2(x i,j). If second transmission signal 303_2 in "reference signal x3701_j based on the j-th parameter at transmitting panel antenna x i" is tx2refj(t), multiplier 304_2 obtains tx2refj(t)×w2(x i,j). Then, terminal #i of 902_i transmits tx2refj(t)×w2(x i,j) from antenna 306_2 in FIG. 3.

[0466] When terminal #i of 902_i transmits "reference signal x3701_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 30, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna xi of 106_xi to w3(xi,j). If third transmission signal 303_3 in "reference signal x3701_j based on the j-th parameter at transmitting panel antenna xi" is tx3refj(t), multiplier 304_3 obtains tx3refj(t) × w3(xi,j). Then, terminal #i of 902_i transmits tx3refj(t) × w3(xi,j) from antenna 306_3 of FIG. 3.

[0467] When terminal #i of 902_i transmits "reference signal x3701_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 30, terminal #i of 902_i sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of 106_xi to w4(xi,j). If fourth transmission signal 303_4 in "reference signal x3701_j based on the j-th parameter at transmitting panel antenna xi" is tx4refj(t), multiplier 304_4 obtains tx4refj(t) × w4(xi,j). Then, terminal #i of 902_i transmits tx4refj(t) × w4(xi,j) from antenna 306_4 in FIG. 3.

[0468] In the case of Fig. 30, j is an integer greater than or equal to 1 and less than or equal to 4. In Fig. 30, the number of parameter changes Z is set to Z=4, but the number of parameter changes Z is not limited to 4, and can be implemented in the same way as long as Z is an integer greater than or equal to 1 or an integer greater than or equal to 2. In this case, j is an integer greater than or equal to 1 and less than or equal to Z.

[0469] As shown in Figures 27 and 30, when terminal #i of 902_i transmits a "reference signal x3401_xi for sector sweep at transmitting panel antenna xi," the "reference signal x3701_j based on the jth parameter at transmitting panel antenna xi" is assumed to include, for example, the following information:

[0470] As mentioned above, information on the "transmitting panel antenna and parameters" of base station #1 of 901_1, which has good reception quality.

[0471] Therefore, terminal #i of 902_i will transmit "information on the transmitting panel antenna and parameters" of base station #1 of 901_1 with good reception quality in "reference signal x3401_1 for sector sweep at transmitting panel antenna 1," "reference signal x3401_2 for sector sweep at transmitting panel antenna 2," ..., "reference signal x3401_M for sector sweep at transmitting panel antenna M" in Figure 27.

[0472] Furthermore, in the "reference signal x3701_1 based on the first parameter at transmitting panel antenna xi," "reference signal x3701_2 based on the second parameter at transmitting panel antenna xi," "reference signal x3701_3 based on the third parameter at transmitting panel antenna xi," and "reference signal x3701_4 based on the fourth parameter at transmitting panel antenna xi" in Figure 30 of "reference signal x3401_1 for sector sweep at transmitting panel antenna 1," "reference signal x3401_2 for sector sweep at transmitting panel antenna 2," ..., "reference signal x3401_M for sector sweep at transmitting panel antenna M" in Figure 27, terminal #i of 902_i will transmit "information on the transmitting panel antenna and parameters" of base station #1 of 901_1 with good reception quality."

[0473] In this case, even if the base station #1 of 901_1 uses, for example, an omni-antenna, it is highly likely that it will be able to receive any of the "sector sweep reference signal x3401_1 at transmitting panel antenna 1," "sector sweep reference signal x3401_2 at transmitting panel antenna 2," ..., "sector sweep reference signal x3401_M at transmitting panel antenna M" in FIG. 27 transmitted by the terminal #i of 902_i. This is because the terminal #i of 902_i is performing transmit beamforming (directivity control). This has the effect of increasing the likelihood that the base station #1 of 901_1 will be able to obtain "information on the transmitting panel antenna and parameters of the base station #1 of 901_1 with good reception quality" transmitted by the terminal #i of 902_i. Therefore, the base station #1 of 901_1 can transmit a modulated signal to the terminal #i of 902_i based on the "information on the transmitting panel antenna and parameters" of the base station #1 of 901_1 with good reception quality, and the terminal #i of 902_i can receive the modulated signal with high reception quality.

[0474] Furthermore, as shown in Figure 29, when multiple terminals are transmitting sector sweep reference signals, base station #1 of 901_1 can obtain information on the ``transmitting panel antenna and parameters'' of base station #1 of 901_1 with good reception quality from the multiple terminals, thereby allowing base station #1 of 901_1 to transmit modulated signals to the multiple terminals based on the ``information on the ``transmitting panel antenna and parameters'' of base station #1 of 901_1 with good reception quality'' from the multiple terminals, and the multiple terminals can receive the modulated signals with high reception quality.

[0475] Also, as shown in Figures 27 and 30, when terminal #i of 902_i transmits a "reference signal x3401_xi for sector sweep at transmitting panel antenna xi," the "reference signal x3701_j based on the jth parameter at transmitting panel antenna xi" may include, for example, the following information:

[0476] - ID (identification) of the transmitting panel antenna (here, for example, corresponds to i) Identification number (ID) of the parameter used in beamforming (directivity control) (here, for example, corresponds to j)

[0477] When terminal #i of 902_i transmits the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)", base station #1 of 901_1 can know the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" that it was able to receive, and terminal #i of 902_i and base station #1 of 901_1 can perform appropriate control, thereby achieving the effect of improving the data reception quality.

[0478] Note that the "reference signal 3701_j based on the j-th parameter in the transmitting panel antenna xi" may include other information.

[0479] FIG. 31 shows an example of the configuration of feedback signal 1002 transmitted by base station #1 of 901_1, which exists in the time interval from t2 to t3 in FIG. 10. In FIG. 31, the horizontal axis represents time. In this example, since the "number of slots in which a terminal can transmit a sector sweep reference signal when transmitting a sector sweep reference signal (the number of terminals to which a sector sweep reference signal can be transmitted)" is 4, as shown in FIG. 31, feedback signal 1002 includes feedback signals addressed to four terminals, such as feedback signal x3801_1 addressed to a first terminal, feedback signal x3801_2 addressed to a second terminal, feedback signal x3801_3 addressed to a third terminal, and feedback signal x3801_4 addressed to a fourth terminal. In addition, for example, if the "number of slots in which a terminal can transmit a sector sweep reference signal when transmitting a sector sweep reference signal (the number of terminals to which a sector sweep reference signal can be transmitted)" is Ω, feedback signal 1002 may include feedback signals for Ω terminals. Here, Ω is an integer of 1 or greater or an integer of 2 or greater.

[0480] For example, as shown in FIG. 29, if terminal #1 of 902_1 transmits a sector sweep reference signal x3601_1 and terminal #2 of 902_2 transmits a sector sweep reference signal x3601_2, base station #1 of 901_1 transmits a feedback signal to terminal #1 of 902_1 using feedback signal x3801_1 addressed to the first terminal, and transmits a feedback signal to terminal #2 of 902_2 using feedback signal x3801_3 addressed to the third terminal.

[0481] At this time, the feedback signal x3801_1 addressed to the first terminal is assumed to include information indicating, for example, that communication with terminal #1 of 902_1 is possible (or that frame 1003 including data symbols in FIG. 10 includes symbols addressed to terminal #1 of 902_1).

[0482] The feedback signal 3801_3 addressed to the third terminal is assumed to include, for example, information indicating that communication with terminal #2 of 902_2 is possible (or that frame 1003 including data symbols in FIG. 10 includes symbols addressed to terminal #2 of 902_2).

[0483] Based on the "information on the transmitting panel antenna and parameters of base station #1 of 901_1 with good reception quality" sent by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna, sets beamforming parameters, and transmits feedback signal x3801_1 to the first terminal.

[0484] Similarly, based on the "information on the transmitting panel antenna and parameters of base station #1 of 901_1 with good reception quality" sent by terminal #2 of 902_2, base station #1 of 901_1 selects a transmitting panel antenna, sets beamforming parameters, and transmits feedback signal x3801_3 to the third terminal.

[0485] 32 shows an example of the configuration of frame 1003 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in FIG. 10. In FIG. 32, the horizontal axis represents time. In this example, since the "number of slots in which a terminal can transmit a sector sweep reference signal when transmitting a sector sweep reference signal (the number of terminals to which the sector sweep reference signal can be transmitted)" is 4, as shown in FIG. 17, frame 1003 including data symbols includes modulated signals (slots) addressed to four terminals, such as a modulated signal addressed to a first terminal (slot addressed to a first terminal) x3901_1, a modulated signal addressed to a second terminal (slot addressed to a second terminal) x3901_2, a modulated signal addressed to a third terminal (slot addressed to a third terminal) x3901_3, and a modulated signal addressed to a fourth terminal (slot addressed to a fourth terminal) x3901_4. For example, if "the number of slots in which a terminal can transmit a sector sweep reference signal when transmitting the sector sweep reference signal (the number of terminals to which the sector sweep reference signal can be transmitted)" is Ω, then frame 1003 including data symbols may have Ω modulated signals (slots) addressed to terminals, where Ω is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0486] For example, as shown in FIG. 29, if terminal #1 of 902_1 transmits a sector sweep reference signal x3601_1 and terminal #2 of 902_2 transmits a sector sweep reference signal x3601_2, base station #1 of 901_1 transmits a modulated signal (slot) to terminal #1 of 902_1 using a modulated signal addressed to the first terminal (slot addressed to the first terminal) x3901_1, and transmits a modulated signal (slot) to terminal #2 of 902_2 using a modulated signal addressed to the third terminal (slot addressed to the first terminal) x3901_3.

[0487] At this time, it is assumed that the modulated signal (slot addressed to the first terminal) x3901_1 addressed to the first terminal includes, for example, a data symbol (data, information) addressed to terminal #1 of 902_1.

[0488] The modulated signal (slot addressed to the third terminal) x3901_3 is assumed to include, for example, a data symbol (data, information) addressed to terminal #2 of 902_2.

[0489] Based on the "information on the transmitting panel antenna and parameters of base station #1 of 901_1 with good reception quality" sent by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna, sets beamforming parameters, and transmits modulated signal (slot addressed to first terminal) x3901_1 addressed to the first terminal.

[0490] Similarly, based on the "information on the transmitting panel antenna and parameters of base station #1 of 901_1 with good reception quality" sent by terminal #2 of 902_2, base station #1 of 901_1 selects a transmitting panel antenna, sets beamforming parameters, and transmits modulated signal (slot destined for third terminal) x3901_3 destined for the third terminal.

[0491] In addition, in FIG. 31, "base station #1 of 901_1 receives "sector sweep reference signal 3601_1 transmitted by terminal #1 of 902_1" and estimates "transmitting panel antenna and parameters" of terminal #1 of 902_1 with good reception quality, and this information may be included in feedback signal x3801_1 addressed to the first terminal."

[0492] As a result, terminal #1 of 902_1 selects a transmitting panel antenna based on the information on the "transmitting panel antenna and parameters" of terminal #1 of 902_1 with good reception quality obtained from base station #1 of 901_1, determines a beamforming method, and transmits symbols, frames and / or modulated signals to base station #1 of 901_1, thereby achieving the effect of improving the reception quality of data at base station #1 of 901_1.

[0493] In FIG. 31, base station #1 of 901_1 may receive "sector sweep reference signal x3601_2 transmitted by terminal #2 of 902_2" and estimate the "transmitting panel antenna and parameters" of terminal #2 of 902_2 with good reception quality, and this information may be included in feedback signal x3801_3 addressed to the third terminal.

[0494] As a result, terminal #2 of 902_2 selects a transmitting panel antenna based on the information on the "transmitting panel antenna and parameters" of terminal #2 of 902_2 with good reception quality obtained from base station #2 of 901_1, determines a beamforming method, and transmits symbols, frames and / or modulated signals to base station #1 of 901_1, thereby achieving the effect of improving the reception quality of data at base station #1 of 901_1.

[0495] Also, in the time period from t3 to t4, the terminals, i.e., in the above description, terminal #1 of 902_1 and terminal #2 of 902_2, may transmit modulated signals to base station #1 of 901_1 including information such as ACK (acknowledgement) indicating that the signal from base station #1 of 901_1 has been received.

[0496] 32, the modulated signal (slot destined for the first terminal) x3901_1 may include, in addition to data symbols, reference signals such as a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), and a sounding reference signal (SRS), pilot symbols, pilot signals, preambles, and symbols containing control information. Possible symbols containing control information include information about the destination terminal (an ID that can identify the terminal), a method for transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (such as code length and coding rate), and information about the MCS (Modulation and Coding Scheme).

[0497] Similarly, the modulated signal addressed to the second terminal (slot addressed to the second terminal) x3901_2, the modulated signal addressed to the third terminal (slot addressed to the third terminal) x3901_3, and the modulated signal addressed to the fourth terminal (slot addressed to the fourth terminal) x3901_4 may include, in addition to data symbols, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, symbols containing control information, etc. Note that the symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method for transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), information about the MCS, etc.

[0498] Figure 18 shows an example of a situation when base station #1 of 901_1 communicates with "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" as shown in Figure 26. Figure 18(A) shows an example of a transmission situation of a modulated signal from base station #1 of 901_1, and Figure 18(B) shows an example of a transmission situation of a modulated signal from "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3". In Figures 18(A) and 18(B), the horizontal axis represents time.

[0499] First, the base station #1 of 901_1 transmits a sector sweep reference signal 1801_1. Note that this point has already been explained with reference to FIG. 10, so the explanation will be omitted.

[0500] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3" transmit a sector sweep reference signal 1851_1. Note that this point has already been explained using Fig. 13, Fig. 29, etc., so the explanation will be omitted.

[0501] The base station #1 of 901_1 transmits a feedback signal 1802_1. Note that this point has already been explained with reference to FIG. 31, so the explanation will be omitted.

[0502] Thereafter, base station #1 of 901_1 transmits "frame 1803_1 including data symbols." Note that this point has already been explained using FIG. 32, so the explanation will be omitted. (Therefore, "frame 1803_1 including data symbols" is considered to be, for example, a frame for downlink.)

[0503] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" transmit "frame 1852_1 including data symbols." The configuration of this frame will be explained later with reference to FIG. 33. (Therefore, "frame 1852_1 including data symbols" is considered to be, for example, a frame for uplink.)

[0504] Next, the base station #1 of 901_1 transmits a "frame 1803_2 including a data symbol." Note that the method of configuring the "frame 1803_2 including a data symbol" is as described with reference to FIG.

[0505] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" transmit "frame 1852_2 including data symbols." Note that the configuration of this frame will be described later with reference to FIG.

[0506] FIG. 19 shows an example of a transmission state of a modulated signal of the base station #1 of 901_1 and a transmission state of a modulated signal of terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3" after FIG.

[0507] FIG. 19(A) shows an example of a transmission status of a modulated signal from the base station #1 of 901_1, which is a continuation in time of the transmission status of a modulated signal from the base station #1 of 901_1 of FIG. 18(A).

[0508] Figure 19(B) shows an example of the transmission status of modulated signals from "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3," which is a temporal continuation of the transmission status of modulated signals from "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" in Figure 18(B).

[0509] In addition, in FIGS. 19(A) and 19(B), the horizontal axis represents time.

[0510] 18(A) and 18(B), the base station #1 of 901_1 transmits a "frame 1803_3 including a data symbol." Note that the method of configuring the "frame 1803_2 including a data symbol" is as described with reference to FIG.

[0511] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" transmit "frame 1852_3 including data symbol." Note that the configuration of this frame will be described later with reference to FIG.

[0512] Next, the base station #1 of 901_1 transmits a sector sweep reference signal 1801_2. Note that this point has already been explained with reference to FIG.

[0513] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" transmit a sector sweep reference signal 1851_2. Note that this point has already been explained using Fig. 13, Fig. 29, etc., so the explanation will be omitted.

[0514] The base station #1 of 901_1 transmits a feedback signal 1802_2. Note that this point has already been explained with reference to FIG. 31, so the explanation will be omitted.

[0515] Thereafter, the base station #1 of 901_1 transmits a "frame 1803_4 including a data symbol." Note that this point has already been explained with reference to FIG. 32, so further explanation will be omitted.

[0516] Then, terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" transmit "frame 1852_4 including data symbols." Note that the configuration of this frame will be described later with reference to FIG.

[0517] In this way, before "base station #1 of 901_1 transmits a 'frame including data symbols' and / or terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3 transmit a 'frame including data symbols'", base station #1 of 901_1 and the terminals transmit a sector sweep reference signal, and after "base station #1 of 901_1 transmits a 'frame including data symbols' and / or terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3 transmit a 'frame including data symbols'", they transmit a sector sweep reference signal again, and by selecting the transmitting panel antenna to be used and setting the transmitting beamforming, the base station and / or terminals can achieve high data reception quality.

[0518] Next, a configuration example of "frame 1852_i including data symbols" transmitted by terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" will be described with reference to Fig. 33. Note that, for example, i is an integer equal to or greater than 1, and in Fig. 33, the horizontal axis represents time.

[0519] As shown in FIG. 33, it is assumed that a "frame 1852_i including data symbols" is made up of a first time interval, a second time interval, a third time interval, and a fourth time interval.

[0520] For example, terminal #1 of 902_1 transmits frame x4001_1 (including a data symbol) using the first time interval, and terminal #2 of 902_2 transmits frame x4001_2 (including a data symbol) using the third time interval.

[0521] In this way, the "frame 1852_i including data symbols" transmitted by terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, and terminal #3 of 902_3" is, for example, time-divided, and each terminal transmits a frame, and base station #1 of 901_1 receives the frames transmitted by each terminal, thereby suppressing interference and achieving high data reception quality.

[0522] In addition, in frame x4001_1 of FIG. 33, in addition to data symbols, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, symbols including control information, and the like may be included.

[0523] Similarly, in frames existing in the first time interval, second time interval, third time interval, and fourth time interval, such as frames x4001_1 and x4001_2, in addition to data symbols, they may also include, for example, "reference signals such as DMRS, PTRS, SRS," pilot symbols, pilot signals, preambles, and symbols containing control information.

[0524] Although Figure 33 describes a case where a frame transmitted by a terminal is time-divided, the frame transmitted by a terminal may be frequency-divided, or may be spatially divided using MU-MIMO (Multi User-MIMO (Multiple-Input Multiple-Output)). Note that the configurations of the terminal and base station are not limited to those shown in Figures 1A, 1B, and 1C. Furthermore, the configurations of the transmitting panel antenna and receiving panel antenna are not limited to those shown in Figures 3 and 4, and may be any antenna configuration that can generate one or more or multiple transmitting and receiving directivities. Furthermore, while signals, frames, etc. are present in Figures 10, 13, 18, 19, 27, 28, 29, 30, 31, 32, and 33, the names of these are not limited to these, and the function of the transmitted signal itself is important.

[0525] (Fourth embodiment) In the embodiments in this specification such as embodiment 1 to embodiment 3, a method has been described in which a base station, such as base station #1 901_1 in Fig. 9, transmits a reference signal for sector sweep (for example, 1001 in Fig. 10, etc.), and a terminal, such as terminal 902_i in Fig. 9, transmits a reference signal for sector sweep. In this embodiment, variations of the "method in which a base station transmits a reference signal for sector sweep" and the "method in which a terminal transmits a reference signal for sector sweep" will be described.

[0526] For example, the method in which the base station transmits a reference signal for sector sweep has been described with reference to FIGS. 11, 12, 27, 28, etc.

[0527] Specifically, the sector sweep reference signal is generated based on the ID (identification) of the transmitting panel antenna and the beamforming ID (see Figure 12).

[0528] For example, assume that the base station transmits a sector sweep reference signal using transmission panel antenna #1. In this case, the base station transmits the following sector sweep reference signal using transmission panel antenna #1.

[0529] "(Reference) signal processed based on the beamforming (directivity control) parameter ID0 (parameter ID0) using transmitting panel antenna #1" "(Reference) signal processed based on the beamforming (directivity control) parameter ID1 (parameter ID1) using transmitting panel antenna #1" "(Reference) signal processed based on the beamforming (directivity control) parameter ID2 (parameter ID2) using transmitting panel antenna #1" "(Reference) signal processed based on the beamforming (directivity control) parameter ID3 (parameter ID3) using transmitting panel antenna #1"

[0530] Similarly, it is assumed that the base station transmits a sector sweep reference signal using transmission panel antenna #2. In this case, the base station transmits the following sector sweep reference signal using transmission panel antenna #2.

[0531] "(Reference) signal processed based on the beamforming (directivity control) parameter ID0 (parameter ID0) using transmitting panel antenna #2" "(Reference) signal processed based on the beamforming (directivity control) parameter ID1 (parameter ID1) using transmitting panel antenna #2" "(Reference) signal processed based on the beamforming (directivity control) parameter ID2 (parameter ID2) using transmitting panel antenna #2" "(Reference) signal processed based on the beamforming (directivity control) parameter ID3 (parameter ID3) using transmitting panel antenna #2."

[0532] That is, the base station transmits a sector sweep reference signal using transmission panel antenna #i, where i is an integer equal to or greater than 1. In this case, the base station transmits the following sector sweep reference signal using transmission panel antenna #i.

[0533] "(Reference) signal processed based on the beamforming (directivity control) parameter ID0 (parameter ID0) using transmitting panel antenna #i" "(Reference) signal processed based on the beamforming (directivity control) parameter ID1 (parameter ID1) using transmitting panel antenna #i" "(Reference) signal processed based on the beamforming (directivity control) parameter ID2 (parameter ID2) using transmitting panel antenna #i" "(Reference) signal processed based on the beamforming (directivity control) parameter ID3 (parameter ID3) using transmitting panel antenna #i"

[0534] In the above, the "ID of the base station's transmitting panel antenna and the ID of the beamforming (directivity control)" are described as separate, but the IDs may be assigned without distinction, and the base station may generate and transmit a reference signal for sector sweep.

[0535] For example, an ID is assigned to "using transmitting panel antenna #1 and using beamforming (directivity control) ID0 (parameter ID0)" and is called ID♭0. An ID is assigned to "using transmitting panel antenna #1 and using beamforming (directivity control) ID1 (parameter ID1)" and is called ID♭1. An ID is assigned to "using transmitting panel antenna #1 and using beamforming (directivity control) ID2 (parameter ID2)" and is called ID♭2. An ID is assigned to "using transmitting panel antenna #1 and using beamforming (directivity control) ID3 (parameter ID3)" and is called ID♭3.

[0536] An ID is assigned to "using transmitting panel antenna #2 and using beamforming (directivity control) ID0 (parameter ID0)" and it is ID♭4. An ID is assigned to "using transmitting panel antenna #2 and using beamforming (directivity control) ID1 (parameter ID1)" and it is ID♭5. An ID is assigned to "using transmitting panel antenna #2 and using beamforming (directivity control) ID2 (parameter ID2)" and it is ID♭6. An ID is assigned to "using transmitting panel antenna #2 and using beamforming (directivity control) ID3 (parameter ID3)" and it is ID♭7.

[0537] An ID is assigned to "using transmitting panel antenna #3 and using beamforming (directivity control) ID0 (parameter ID0)" and it is ID♭8. An ID is assigned to "using transmitting panel antenna #3 and using beamforming (directivity control) ID1 (parameter ID1)" and it is ID♭9. An ID is assigned to "using transmitting panel antenna #3 and using beamforming (directivity control) ID2 (parameter ID2)" and it is ID♭10. An ID is assigned to "using transmitting panel antenna #3 and using beamforming (directivity control) ID3 (parameter ID3)" and it is ID♭11. ...

[0538] The base station then transmits the following sector sweep reference signals: "(reference) signal processed based on ID♭0," "(reference) signal processed based on ID♭1," "(reference) signal processed based on ID♭2," "(reference) signal processed based on ID♭3," "(reference) signal processed based on ID♭4," "(reference) signal processed based on ID♭5," "(reference) signal processed based on ID♭6," "(reference) signal processed based on ID♭7," "(reference) signal processed based on ID♭8," "(reference) signal processed based on ID♭9," "(reference) signal processed based on ID♭10," "(reference) signal processed based on ID♭11," ​​etc. The signals may be transmitted in the order shown above, or in a different order.

[0539] In this case, the "(reference) signal processed based on ID♭k" transmitted by the base station includes information about ID♭k, where k is an integer equal to or greater than 0. Note that the "(reference) signal processed based on ID♭k" transmitted by the base station may include other information, examples of which have been described in other embodiments, and therefore will not be described here. (Information about the transmitting panel antenna may also be included.)

[0540] The terminal then receives the sector sweep reference signal transmitted by the base station, and if the reception quality of the ID with good reception quality, for example, "ID♭3," is good, the terminal transmits a sector sweep reference signal including information about "ID♭3." Note that the sector sweep reference signal transmitted by the terminal may include other information, examples of which are as described in other embodiments. The transmission method of the sector sweep reference signal transmitted by the terminal is as described in other embodiments, and will be described later in this embodiment.

[0541] The transmitting panel antenna of the base station (see Figures 1A, 1B, and 1C) may have the configuration of Figure 3, and the transmitting panel antenna may be composed of one antenna or multiple antennas.

[0542] In light of the above, the base station may generate and transmit a sector sweep reference signal 1001 such as that shown in FIG. 10 as follows.

[0543] Figure 34 shows an example of the configuration of sector sweep reference signal 1001 transmitted by a base station, such as that described with reference to Figure 10. In Figure 34, the vertical axis represents frequency and the horizontal axis represents time. As with the other embodiments, there are frequency bands ♭1, ♭2, ..., and ♭K.

[0544] As shown in Figure 34, the sector sweep reference signal 1001 is composed of ``sector sweep reference signal x4301_1 for frequency ♭1,'' ``sector sweep reference signal x4301_2 for frequency ♭2,'' ... ``sector sweep reference signal x4301_K for frequency ♭K.''

[0545] Fig. 35 shows an example of the configuration of the "sector sweep reference signal x4301_p of frequency ♭p" in Fig. 34. In Fig. 35, the horizontal axis represents time. Note that p is an integer between 1 and K.

[0546] The "reference signal x4301_p for sector sweep of frequency ♭p" is composed of "reference signal x4401_1 based on the first parameter for frequency ♭p," "reference signal x4401_2 based on the second parameter for frequency ♭p," and "reference signal x4401_H based on the H-th parameter for frequency ♭p," where H is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0547] 1A, 1B, or 1C, the "reference signal x4401_i based on the i-th parameter for frequency ♭p" is transmitted using one or more transmitting panel antennas among transmitting panel antenna 1 of 106_1 to transmitting panel antenna M of 106_M, where i is an integer between 1 and H.

[0548] Also, for example, when the base station has the configuration of Figures 1A and 1B, the "reference signal x4401_i based on the i-th parameter for frequency ♭p" is subjected to signal processing (beamforming (directivity control)) using the i-th parameter in the first processing unit 104, and the first processing unit 104 generates a "reference signal x4401_i based on the i-th parameter for frequency ♭p" that is transmitted using one or more transmitting panel antennas from transmitting panel antenna 1 of 106_1 to transmitting panel antenna M of 106_M.

[0549] The "reference signal x4401_i based on the i-th parameter for frequency ♭p" includes, for example, the following information:

[0550] Information about the i-th parameter, e.g., beamforming (directivity control) identification number (ID) (here, e.g., i) When a terminal transmits a reference signal for sector sweep, the number of time divisions that the reference signal for sector sweep can be transmitted Information about the frequency band and / or frequency ♭p (this may include information about the number of frequency divisions)

[0551] Furthermore, other information may be included, for example, information similar to that included in reference signal 1201_a based on the a-th parameter for the transmitting panel antenna for frequency ♭p in Fig. 12 may be included in "reference signal x4401_i based on the i-th parameter for frequency ♭p." Therefore, in this specification, in the operation related to "reference signal 1201_a based on the a-th parameter for the transmitting panel antenna for frequency ♭p in Fig. 12," it is possible to achieve the same operation by replacing it with "reference signal 1201_a based on the a-th parameter for the transmitting panel antenna for frequency ♭p in Fig. 12" and applying "reference signal x4401_i based on the i-th parameter for frequency ♭p."

[0552] In addition, the "reference signal x4401_i based on the i-th parameter for frequency ♭p" may include information about the antenna used to transmit the "reference signal x4401_i based on the i-th parameter for frequency ♭p" (e.g., the ID of the transmitting panel antenna, information about the sector antenna, and the antenna port number).

[0553] In the above, the case of a multi-carrier such as OFDM has been described as an example, but the present invention is not limited to this, and the same can be implemented in the case of a single carrier. In this case, for example, if it is implemented assuming that only frequency ♭1 exists in Figure 34, it becomes possible to implement the single carrier.

[0554] Next, a modified example of the sector sweep reference signal transmitted by the terminal will be described.

[0555] For example, a method in which a terminal transmits a reference signal for sector sweep has been described using FIGS. 14, 15A, 15B, and the like.

[0556] Specifically, the sector sweep reference signal is generated based on the ID (identification) of the transmitting panel antenna and the beamforming ID (see Figures 15A and 15B).

[0557] For example, assume that a terminal transmits a sector sweep reference signal using transmission panel antenna #1. In this case, the terminal transmits the following sector sweep reference signal using transmission panel antenna #1.

[0558] "(Reference) signal processed based on the beamforming (directivity control) parameter ID0 (parameter ID0) using transmitting panel antenna #1" "(Reference) signal processed based on the beamforming (directivity control) parameter ID1 (parameter ID1) using transmitting panel antenna #1" "(Reference) signal processed based on the beamforming (directivity control) parameter ID2 (parameter ID2) using transmitting panel antenna #1" "(Reference) signal processed based on the beamforming (directivity control) parameter ID3 (parameter ID3) using transmitting panel antenna #1"

[0559] Similarly, it is assumed that the terminal transmits a sector sweep reference signal using transmission panel antenna #2. In this case, the terminal transmits the following sector sweep reference signal using transmission panel antenna #2.

[0560] "(Reference) signal processed based on the beamforming (directivity control) parameter ID0 (parameter ID0) using transmitting panel antenna #2" "(Reference) signal processed based on the beamforming (directivity control) parameter ID1 (parameter ID1) using transmitting panel antenna #2" "(Reference) signal processed based on the beamforming (directivity control) parameter ID2 (parameter ID2) using transmitting panel antenna #2" "(Reference) signal processed based on the beamforming (directivity control) parameter ID3 (parameter ID3) using transmitting panel antenna #2."

[0561] That is, the terminal transmits a sector sweep reference signal using transmission panel antenna #i, where i is an integer equal to or greater than 1. In this case, the terminal transmits the following sector sweep reference signal using transmission panel antenna #i.

[0562] "(Reference) signal processed based on the beamforming (directivity control) parameter ID0 (parameter ID0) using transmitting panel antenna #i" "(Reference) signal processed based on the beamforming (directivity control) parameter ID1 (parameter ID1) using transmitting panel antenna #i" "(Reference) signal processed based on the beamforming (directivity control) parameter ID2 (parameter ID2) using transmitting panel antenna #i" "(Reference) signal processed based on the beamforming (directivity control) parameter ID3 (parameter ID3) using transmitting panel antenna #i"

[0563] Although the above describes the "ID of the terminal's transmitting panel antenna and the ID of the beamforming (directivity control)" as separate, the IDs may be assigned without distinction, and the terminal may generate and transmit a reference signal for sector sweep.

[0564] For example, an ID is assigned to "using transmitting panel antenna #1 and using beamforming (directivity control) ID0 (parameter ID0)" and is called ID♭0. An ID is assigned to "using transmitting panel antenna #1 and using beamforming (directivity control) ID1 (parameter ID1)" and is called ID♭1. An ID is assigned to "using transmitting panel antenna #1 and using beamforming (directivity control) ID2 (parameter ID2)" and is called ID♭2. An ID is assigned to "using transmitting panel antenna #1 and using beamforming (directivity control) ID3 (parameter ID3)" and is called ID♭3.

[0565] An ID is assigned to "using transmitting panel antenna #2 and using beamforming (directivity control) ID0 (parameter ID0)" and it is ID♭4. An ID is assigned to "using transmitting panel antenna #2 and using beamforming (directivity control) ID1 (parameter ID1)" and it is ID♭5. An ID is assigned to "using transmitting panel antenna #2 and using beamforming (directivity control) ID2 (parameter ID2)" and it is ID♭6. An ID is assigned to "using transmitting panel antenna #2 and using beamforming (directivity control) ID3 (parameter ID3)" and it is ID♭7.

[0566] An ID is assigned to "using transmitting panel antenna #3 and using beamforming (directivity control) ID0 (parameter ID0)" and it is ID♭8. An ID is assigned to "using transmitting panel antenna #3 and using beamforming (directivity control) ID1 (parameter ID1)" and it is ID♭9. An ID is assigned to "using transmitting panel antenna #3 and using beamforming (directivity control) ID2 (parameter ID2)" and it is ID♭10. An ID is assigned to "using transmitting panel antenna #3 and using beamforming (directivity control) ID3 (parameter ID3)" and it is ID♭11. ...

[0567] The terminal then transmits the following sector sweep reference signals: "a (reference) signal processed based on ID♭0," "a (reference) signal processed based on ID♭1," "a (reference) signal processed based on ID♭2," "a (reference) signal processed based on ID♭3," "a (reference) signal processed based on ID♭4," "a (reference) signal processed based on ID♭5," "a (reference) signal processed based on ID♭6," "a (reference) signal processed based on ID♭7," "a (reference) signal processed based on ID♭8," "a (reference) signal processed based on ID♭9," "a (reference) signal processed based on ID♭10," "a (reference) signal processed based on ID♭11," ​​etc. Note that the signals may be transmitted in the order shown above, or in a different order.

[0568] In this case, the "(reference) signal processed based on ID♭k" transmitted by the terminal includes information on ID♭k, where k is an integer equal to or greater than 0. Note that the "(reference) signal processed based on ID♭k" transmitted by the base station may include other information, examples of which have been described in other embodiments, and therefore will not be described here. (Information on the transmitting panel antenna may also be included.)

[0569] The base station then receives the sector sweep reference signal transmitted by the terminal, and if the reception quality of the ID with good reception quality, for example, "ID♭3," is good, the base station transmits a feedback signal including information about "ID♭3." Note that the feedback signal transmitted by the base station may include other information, examples of which are as described in other embodiments. The transmission method of the feedback signal transmitted by the base station is as described in other embodiments and will be described later in this embodiment.

[0570] The transmitting panel antenna of the terminal (see Figures 1A, 1B, and 1C) may have the configuration of Figure 3, and the transmitting panel antenna may be composed of one antenna or multiple antennas.

[0571] In light of the above, the terminal may generate and transmit a terminal sector sweep reference signal such as that shown in FIG. 13 as follows.

[0572] FIG. 14 shows an example of the arrangement of sector sweep reference signals transmitted by a terminal, and as this has already been explained, a description thereof will be omitted.

[0573] Figure 36 shows an example of the configuration of the "sector sweep reference signal" 1401_i of terminal #i in Figure 14. The "sector sweep reference signal" 1401_i of terminal #i is assumed to be composed of a "reference signal x4511_1 based on the first parameter," a "reference signal x4511_2 based on the second parameter," ..., a "reference signal x4511_G based on the Gth parameter." Note that G is assumed to be an integer equal to or greater than 1, or an integer equal to or greater than 2.

[0574] When terminal #i has, for example, the configuration of Figures 1A, 1B, and 1C, terminal #i's "sector sweep reference signal" 1401_i will be transmitted using one or more transmitting panel antennas from transmitting panel antenna 1 of 106_1 to transmitting panel antenna M of 106_M.

[0575] 1A and 1B, the "reference signal x4511_k based on the k-th parameter" undergoes signal processing (beamforming (directivity control)) using the k-th parameter in the first processing unit 104, and the first processing unit 104 generates the "reference signal x4511_k based on the k-th parameter" to be transmitted using one or more transmitting panel antennas among transmitting panel antenna 1 106_1 to transmitting panel antenna M 106_M. Note that k is an integer between 1 and G.

[0576] The "reference signal x4511_k based on the k-th parameter" includes, for example, the following information:

[0577] Information about the k-th parameter, e.g., beamforming (directivity control) identification number (ID) Information fed back to the base station. For example, information on frequencies (bands) with good reception quality estimated by the terminal after receiving the sector sweep reference signal transmitted by the base station, information on beamforming (directivity control) parameters with good reception quality, and information on antennas with good reception quality.

[0578] The information included in the "reference signal x4511_k based on the k-th parameter" is as explained in the other embodiments, including the above.

[0579] Therefore, in this specification, in the operation related to "reference signal 1511_a based on the a-th parameter in transmitting panel antenna xi in Figure 15B," it is possible to replace it with "reference signal 1511_a based on the a-th parameter in transmitting panel antenna xi in Figure 15B" and apply "reference signal x4511_k based on the k-th parameter," and still achieve the same operation.

[0580] In addition, the "reference signal x4511_k using the kth parameter" may include information about the antenna used to transmit the "reference signal x4511_k using the kth parameter" (e.g., the ID of the transmitting panel antenna, information about the sector antenna, and the antenna port number).

[0581] Another example will be described.

[0582] The transmitting panel antenna of the terminal (see Figures 1A, 1B, and 1C) may have the configuration of Figure 3, and the transmitting panel antenna may be composed of one antenna or multiple antennas.

[0583] In light of the above, the terminal may generate and transmit a terminal sector sweep reference signal such as that shown in FIG. 23 as follows.

[0584] FIG. 24 shows an example of the arrangement of sector sweep reference signals transmitted by a terminal, and as this has already been explained, a description thereof will be omitted.

[0585] Fig. 37 shows an example of the configuration of the sector sweep reference signal x3601_i in Fig. 29. The sector sweep reference signal x3601_i is composed of a "reference signal x4611_1 based on the first parameter," a "reference signal x4611_2 based on the second parameter," ..., a "reference signal x4611_F based on the Fth parameter," where F is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0586] When terminal #i has, for example, the configuration of Figures 1A, 1B, and 1C, the sector sweep reference signal x3601_i will be transmitted using one or more transmitting panel antennas from transmitting panel antenna 1 of 106_1 to transmitting panel antenna M of 106_M.

[0587] 1A and 1B, the "reference signal x4611_k based on the k-th parameter" undergoes signal processing (beamforming (directivity control)) using the k-th parameter in the first processing unit 104, and the first processing unit 104 generates the "reference signal x4611_k based on the k-th parameter" to be transmitted using one or more transmitting panel antennas among transmitting panel antenna 1 106_1 to transmitting panel antenna M 106_M. Note that k is an integer between 1 and F.

[0588] The "reference signal x4611_k based on the k-th parameter" includes, for example, the following information:

[0589] Information about the k-th parameter, e.g., beamforming (directivity control) identification number (ID) Information fed back to the base station. For example, information on frequencies (bands) with good reception quality estimated by the terminal after receiving the sector sweep reference signal transmitted by the base station, information on beamforming (directivity control) parameters with good reception quality, and information on antennas with good reception quality.

[0590] The information included in the "reference signal x4611_k based on the k-th parameter" is as described in the other embodiments, including the above.

[0591] Therefore, in this specification, in the operation related to "reference signal 1511_a based on the a-th parameter in transmitting panel antenna xi in Figure 15B," it is possible to replace it with "reference signal 1511_a based on the a-th parameter in transmitting panel antenna xi in Figure 15B" and apply "reference signal x4611_k based on the k-th parameter," and still achieve the same operation.

[0592] In addition, the "reference signal x4611_k using the kth parameter" may include information about the antenna used to transmit the "reference signal x4611_k using the kth parameter" (e.g., the ID of the transmitting panel antenna, information about the sector antenna, and the antenna port number).

[0593] The base station may transmit to the terminal the information of the receiving panel antenna used when the base station receives the modulated signal and the information of the beamforming (directivity control) parameters used in reception. Also, as in the example of transmission described above, an ID may be assigned without distinguishing between the information of the receiving panel antenna and the beamforming (directivity control), and this ID information may be transmitted to the terminal.

[0594] Although Figures 1A, 1B, and 1C are shown as examples of the configuration of a base station, the configuration is not limited to these, and the configuration of the receiving panel antenna is not limited to the configuration of Figure 4, and the receiving panel antenna may be composed of one antenna or multiple antennas.

[0595] At this time, beamforming (directivity control) during reception may be performed using one or more receiving panel antennas (one or more receiving antennas). Information on the beamforming (directivity control) parameters used during reception may then be transmitted to the communication partner (terminal).

[0596] The terminal may transmit to the base station, to the other party (the communication partner), information about the receiving panel antenna used by the terminal when receiving the modulated signal and information about the beamforming (directivity control) parameters used in reception. Also, as in the example of transmission described above, an ID may be assigned without distinguishing between the receiving panel antenna information and the beamforming (directivity control), and this ID information may be transmitted to the other party (the communication partner).

[0597] Although Figures 1A, 1B, and 1C are shown as examples of the terminal configuration, the configuration is not limited to these, and the configuration of the receiving panel antenna is not limited to the configuration of Figure 4, and the receiving panel antenna may be composed of one antenna or multiple antennas.

[0598] At this time, beamforming (directivity control) during reception may be performed using one or more receiving panel antennas (one or more receiving antennas), and information on the beamforming (directivity control) parameters used during reception may be transmitted to the communication partner (base station).

[0599] Although examples of base station transmit beamforming, base station receive beamforming, terminal transmit beamforming, and terminal receive beamforming have been described using Embodiments 1 to 4, implementation methods are not limited to these examples. For example, a base station may use either a multi-carrier scheme such as OFDM or a single-carrier scheme, and the base station may support both a multi-carrier scheme such as OFDM and a single-carrier scheme. Similarly, a terminal may use either a multi-carrier scheme such as OFDM or a single-carrier scheme, and the terminal may support both a multi-carrier scheme such as OFDM and a single-carrier scheme.

[0600] (Embodiment 5)

[0601] Wireless systems with different wireless communication methods may share a "licensed band and / or unlicensed band." For example, an NR system in a frequency band of 52.6 GHz or higher and 71 GHz or lower and an IEEE802.11ad / ay wireless system may share a "licensed band and / or unlicensed band." An example of operation when wireless systems with different wireless communication methods share a "licensed band and / or unlicensed band" will be described below. Note that the operation described in this embodiment is applicable to the case where frequencies (bands) are shared.

[0602] FIG. 38 is a diagram showing an example of a wireless system according to the fifth embodiment. In FIG. 38, an NR wireless system and an IEEE 802.11ad and / or IEEE 802.11ay wireless system are assumed to exist in a certain space. Hereinafter, IEEE 802.11ad and / or IEEE 802.11ay may be referred to as the first standard.

[0603] An NR (New Radio) radio system includes a base station and a terminal. The NR base station may be referred to as a gNB (g Node B). The NR terminal may be referred to as a UE (User Equipment). However, the terminology is not limited to this. Hereinafter, the NR terminal may also be referred to as an "NR-UE."

[0604] The wireless system defined by the first standard includes a base station and a terminal. The base station defined by the first standard may be referred to as an AP (Access Point). The terminal defined by the first standard may be referred to as a UE.

[0605] The NR radio system and the radio system defined in the first standard share a "licensed band and / or an unlicensed band." The NR radio system and the radio system defined in the first standard can occupy a "licensed band and / or an unlicensed band" based on, for example, LBT (Listen Before Talk).

[0606] In a simple method, for example, the NR radio system and / or the radio system specified by the first standard performs carrier sensing and starts communication if the channel is not in use, whereas the NR radio system and / or the radio system specified by the first standard waits to start communication if the channel is in use.

[0607] Next, we will explain one characteristic communication method in the NR wireless system.

[0608] 39A, 39B, and 39C show an example of multiple TRP (multiple TX / RX point) (multiple transmission / reception point) (multi-TRP).

[0609] In FIG. 39A, TRP#1 of 3902_1 and TRP#2 of 3902_2 may be in communication with each other via a network, for example.

[0610] It is also assumed that the NR-UE 3901 is performing, for example, wireless communication with the TRP#1 of the 3902_1, and that the NR-UE 3901 is performing, for example, wireless communication with the TRP#2 of the 3902_2.

[0611] At this time, TRP#1 of 3902_1 transmits a modulated signal for communication to NR-UE 3901. This modulated signal may include a PDSCH (Physical Downlink Shared Channel).

[0612] Also, TRP#2 of 3902_2 transmits a modulated signal for communication to NR-UE 3901. This modulated signal may include a PDSCH.

[0613] The "modulated signal transmitted by TRP#1 of 3902_1" and the "modulated signal transmitted by TRP#2 of 3902_2" may be any of "spatial division multiplexing (SDM)", "Frequency Division Multiplexing (FDM)", and "Time Division Multiplexing (TDM)".

[0614] The NR-UE 3901 transmits a modulated signal to the TRP#1 of the 3902_1 for communication. This modulated signal may include a PUSCH (Physical Uplink Shared Channel).

[0615] Also, the NR-UE 3901 transmits a modulated signal to the TRP#2 of the 3902_2 for communication. This modulated signal may include a PUSCH.

[0616] The "modulated signal transmitted by NR-UE 3901 to TRP#1 of 3902_1" and the "modulated signal transmitted by NR-UE 3901 to TRP#2 of 3902_2" may be any of "spatial division multiplexing (SDM)", "Frequency Division Multiplexing (FDM)", and "Time Division Multiplexing (TDM)".

[0617] Fig. 39B is an example of multiple TRPs different from Fig. 39A. In Fig. 39B, TRP#1 of 3902_1 and TRP#2 of 3902_2 may communicate with each other via a network, for example.

[0618] It is also assumed that the NR-UE 3901 is performing, for example, wireless communication with the TRP#1 of the 3902_1, and that the NR-UE 3901 is performing, for example, wireless communication with the TRP#2 of the 3902_2.

[0619] At this time, TRP#1 of 3902_1 transmits a modulated signal for communication to NR-UE 3901. This modulated signal may include a PDSCH.

[0620] The NR-UE 3901 transmits a modulated signal to the TRP#1 of the 3902_1 for communication. This modulated signal may include a PUSCH. Also, the NR-UE 3901 transmits a modulated signal to the TRP#2 of the 3902_2 for communication. This modulated signal may include a PUSCH.

[0621] The "modulated signal transmitted by NR-UE 3901 to TRP#1 of 3902_1" and the "modulated signal transmitted by NR-UE 3901 to TRP#2 of 3902_2" may be any of "spatial division multiplexing (SDM)", "Frequency Division Multiplexing (FDM)", and "Time Division Multiplexing (TDM)".

[0622] Fig. 39C is an example of multiple TRPs different from those in Fig. 39A and Fig. 39B. In Fig. 39C, TRP#1 of 3902_1 and TRP#2 of 3902_2 may communicate with each other via a network, for example.

[0623] It is also assumed that the NR-UE 3901 is performing, for example, wireless communication with the TRP#1 of the 3902_1, and that the NR-UE 3901 is performing, for example, wireless communication with the TRP#2 of the 3902_2.

[0624] At this time, TRP#1 of 3902_1 transmits a modulated signal for communication to NR-UE 3901. This modulated signal may include a PDSCH.

[0625] Also, TRP#2 of 3902_2 transmits a modulated signal for communication to NR-UE 3901. This modulated signal may include a PDSCH.

[0626] The "modulated signal transmitted by TRP#1 of 3902_1" and the "modulated signal transmitted by TRP#2 of 3902_2" may be any of "spatial division multiplexing (SDM)", "Frequency Division Multiplexing (FDM)", and "Time Division Multiplexing (TDM)".

[0627] The NR-UE 3901 transmits a modulated signal to the TRP#1 of the 3902_1 for communication. This modulated signal may include a PUSCH.

[0628] 39A, 39B, and 39C are described as examples of multiple TRPs, but the present invention is not limited to these examples. For example, an NR-UE may communicate with three or more TRPs. In this case, the NR-UE may transmit modulated signals to three or more TRPs, or the NR-UE may receive modulated signals transmitted by three or more TRPs.

[0629] 39A, 39B, and 39C, the TRP is referred to as a base station, a gNB, an eNB (e Node B), a repeater, etc. However, the TRP may be something other than these. This also applies to the other drawings.

[0630] We will explain that the "modulated signal transmitted by NR-UE 3901 to TRP#1 of 3902_1" and the "modulated signal transmitted by NR-UE 3901 to TRP#2 of 3902_2" are "spatial multiplexing (SDM: Spatial Division Multiplexing)," "FDM (Frequency Division Multiplexing)," and "TDM (Time Division Multiplexing)."

[0631] (A) of Figure 40 and (B) of Figure 40 show examples when the "modulated signal transmitted by NR-UE 3901 to TRP#1 of 3902_1" and the "modulated signal transmitted by NR-UE 3901 to TRP#2 of 3902_2" are SDM or FDM.

[0632] In (A) and (B) of Figure 40, the horizontal axis represents time. As shown in (A) of Figure 40, NR-UE 3901 transmits modulated signal 4001_1 addressed to TRP#1 of 3902_1 at the first time.

[0633] Also, as shown in (B) of FIG. 40, NR-UE 3901 transmits modulated signal 4001_2 addressed to TRP#2 of 3902_2 at the first time.

[0634] In this case, if the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are the same (common), it is SDM. Note that even if the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are partially the same (common), it may still be called SDM.

[0635] If the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are different, FDM is used.

[0636] Figures 41(A) and 41(B) show examples different from Figures 40(A) and 40(B), where the "modulated signal transmitted by NR-UE 3901 to TRP#1 of 3902_1" and the "modulated signal transmitted by NR-UE 3901 to TRP#2 of 3902_2" are SDM or FDM.

[0637] In Figures 41(A) and 41(B), the horizontal axis represents time, and the same numbers are used for elements similar to those in Figures 40(A) and 40(B). As shown in Figure 41(A), NR-UE 3901 transmits modulated signal 4001_1 addressed to TRP#1 of 3902_1, and modulated signal 4001_1 addressed to TRP#1 of 3902_1 is present at least at the first time.

[0638] Also, as shown in (B) of FIG. 41, NR-UE 3901 transmits modulated signal 4001_2 addressed to TRP#2 of 3902_2, and modulated signal 4001_2 addressed to TRP#2 of 3902_2 exists at least during the first time period.

[0639] In this case, if the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are the same (common), it becomes SDM in the first time. Note that even if the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are partially the same (common) in the first time, it may be called SDM.

[0640] If the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are different, FDM is used.

[0641] (A) of Figure 42 and (B) of Figure 42 show examples when the "modulated signal transmitted by NR-UE 3901 to TRP#1 of 3902_1" and the "modulated signal transmitted by NR-UE 3901 to TRP#2 of 3902_2" are TDM or FDM.

[0642] In Figures 42(A) and 42(B), the horizontal axis represents time, and the same numbers are used for elements similar to those in Figures 40(A) and 40(B). As shown in Figure 42(A), NR-UE 3901 transmits modulated signal 4001_1 addressed to TRP#1 of 3902_1 at the first time.

[0643] Also, as shown in (B) of FIG. 42, NR-UE 3901 transmits modulated signal 4001_2 addressed to TRP#2 of 3902_2 at the second time.

[0644] The first time and the second time are different times.

[0645] In this case, if the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are the same (common), it is called TDM. Note that even if the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are partially the same (common), it may be called TDM.

[0646] If the "frequency used by modulated signal 4001_1 addressed to TRP#1" and the "frequency used by modulated signal 4001_2 addressed to TRP#2" are different, FDM is used.

[0647] It should be noted that examples of SDM, TDM, and FDM are not limited to "the examples of Figures 40(A) and 40(B)," "the examples of Figures 41(A) and 41(B)," and "the examples of Figures 42(A) and 42(B)."

[0648] SDMs such as "SDMs with multiple TRPs such as (A) and (B) of Figure 40" and "SDMs with multiple TRPs such as (A) and (B) of Figure 41" may hereinafter be referred to as "uplink SDMs with multiple TRPs."

[0649] In addition, TDM such as "TDM with multiple TRPs as in (A) of Figure 42 and (B) of Figure 42" may be referred to as "uplink TDM with multiple TRPs" hereinafter.

[0650] FDMs such as "FDM with multiple TRPs as in Figures 40(A) and 40(B)," "FDM with multiple TRPs as in Figures 41(A) and 41(B)," and "FDM with multiple TRPs as in Figures 42(A) and 42(B)" may be referred to as "uplink FDM with multiple TRPs" hereafter.

[0651] Next, we will explain that the "modulated signal transmitted by TRP#1 of 3902_1" and the "modulated signal transmitted by TRP#2 of 3902_2" are "spatial division multiplexing (SDM)", "Frequency Division Multiplexing (FDM)", and "Time Division Multiplexing (TDM)".

[0652] (A) of Figure 43 and (B) of Figure 43 show examples when the "modulated signal transmitted by TRP#1 of 3902_1 to NR-UE3901" and the "modulated signal transmitted by TRP#2 of 3902_2 to NR-UE3901" are SDM or FDM.

[0653] In Figures 43A and 43B, the horizontal axis represents time. As shown in Figure 43A, TRP#1 of 3902_1 transmits modulated signal 4301_1 addressed to NR-UE of 3901 at the first time.

[0654] Also, as shown in FIG. 43(B), TRP#2 of 3902_2 transmits modulated signal 4301_2 addressed to NR-UE of 3901 at the first time.

[0655] In this case, if the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are the same (common), it is SDM. Note that even if the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are partially the same (common), it may be called SDM.

[0656] If the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are different, FDM is used.

[0657] Figures 44(A) and 44(B) show examples different from Figures 43(A) and 43(B) when the "modulated signal transmitted by TRP#1 of 3902_1 to NR-UE3901" and the "modulated signal transmitted by TRP#2 of 3902_2 to NR-UE3901" are SDM or FDM.

[0658] In Figures 44(A) and 44(B), the horizontal axis represents time, and the same numbers are used for elements similar to those in Figures 43(A) and 43(B). As shown in Figure 44(A), TRP#1 of 3902_1 transmits modulated signal 4301_1 addressed to NR-UE of 3901, and modulated signal 4301_1 addressed to NR-UE of 3901 is present at least at the first time.

[0659] Also, as shown in FIG. 44(B), TRP#2 of 3902_2 transmits modulated signal 4301_2 addressed to NR-UE of 3901, and modulated signal 4301_2 addressed to NR-UE of 3901 exists at least during the first time period.

[0660] In this case, if the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are the same (common), it becomes SDM at the first time. Note that even if the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are partially the same (common) at the first time, it may be called SDM.

[0661] If the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are different, FDM is used.

[0662] (A) of Figure 45 and (B) of Figure 45 show examples when the "modulated signal transmitted by TRP#1 of 3902_1 to NR-UE3901" and the "modulated signal transmitted by TRP#2 of 3902_2 to NR-UE3901" are TDM or FDM.

[0663] In Figures 45(A) and 45(B), the horizontal axis represents time, and the same numbers are used for elements similar to those in Figures 43(A) and 43(B). As shown in Figure 45(A), TRP#1 of 3902_1 transmits modulated signal 4301_1 addressed to NR-UE of 3901 at the first time.

[0664] Also, as shown in FIG. 45(B), TRP#2 of 3902_2 transmits modulated signal 4301_2 addressed to NR-UE of 3901 at the second time.

[0665] The first time and the second time are different times.

[0666] In this case, if the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are the same (common), it is called TDM. Note that even if the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are partially the same (common), it may also be called TDM.

[0667] If the "frequency used by modulated signal 4301_1 addressed to NR-UE" and the "frequency used by modulated signal 4301_2 addressed to NR-UE" are different, FDM is used.

[0668] It should be noted that examples of SDM, TDM, and FDM are not limited to "the examples in Figures 43(A) and 43(B)," "the examples in Figures 44(A) and 44(B)," and "the examples in Figures 45(A) and 45(B)."

[0669] SDMs such as "SDMs with multiple TRPs such as (A) and (B) of Figures 43" and "SDMs with multiple TRPs such as (A) and (B) of Figures 44" may hereinafter be referred to as "downlink SDMs with multiple TRPs."

[0670] In addition, TDM such as "TDM with multiple TRPs as in (A) of Figure 45 and (B) of Figure 45" may be referred to as "downlink TDM with multiple TRPs" hereinafter.

[0671] FDMs such as "FDM with multiple TRPs as in Figures 43(A) and 43(B)," "FDM with multiple TRPs as in Figures 44(A) and 44(B)," and "FDM with multiple TRPs as in Figures 45(A) and 45(B)" may hereinafter be referred to as "downlink FDM with multiple TRPs."

[0672] Figure 46 is a diagram showing an example of the configuration of, for example, a gNB, an NR-UE, and a TRP. The transmitting and receiving panel antenna i of x705_i in Figure 46 is, for example, an antenna equipped with Figures 3 and 4. In this case, i is an integer between 1 and M, and M is an integer greater than or equal to 1 or an integer greater than or equal to 2. Therefore, the transmitting and receiving panel antenna i of x705_i can perform transmitting beamforming (transmitting directivity control) and receiving beamforming (receiving directivity control).

[0673] The specific operations of transmit beamforming (transmit directivity control) and receive beamforming (receive directivity control) have already been explained, and the device performs transmit beamforming (transmit directivity control) to transmit sector sweep preference signals, feedback signals, frames, slots, modulation signals, data symbols, etc.

[0674] Figure 47 is a diagram showing another example of the configuration of a gNB, an NR-UE, and a TRP. In Figure 47, the same numbers are used for components that operate in the same way as in Figure 46, and descriptions thereof will be omitted.

[0675] When a gNB has the configuration of Figure 47, it will perform transmit beamforming (transmit directivity control) and receive beamforming (receive directivity control) using one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m."

[0676] Then, the gNB having the configuration of Figure 47 will perform transmit beamforming (transmit directivity control) and transmit a sector sweep preference signal as already described.

[0677] For example, a gNB having the configuration of Figure 47 may use a first transmit beam and transmit a first sector sweep preference signal, use a second transmit beam and transmit a second sector sweep preference signal, etc.

[0678] The gNB then determines the "transmit beamforming and receive beamforming" to be used to communicate with each terminal, and transmits and receives feedback signals, frames, slots, modulated signals, data symbols, etc.

[0679] When an NR-UE has the configuration of Figure 47, it will perform transmit beamforming (transmit directivity control) and receive beamforming (receive directivity control) using one or more antennas from "transmit / receive antenna 1 of x805_1 to transmit / receive antenna m of x805_m."

[0680] Then, the NR-UE having the configuration of FIG. 47 performs transmit beamforming (transmit directivity control) and transmits a sector sweep preference signal as already explained.

[0681] For example, an NR-UE having the configuration of Figure 47 may use a first transmit beam and transmit a first sector sweep preference signal, use a second transmit beam and transmit a second sector sweep preference signal, etc.

[0682] Then, it determines the "transmit beamforming and receive beamforming" to be used for communication with the gNB, and transmits and receives feedback signals, frames, slots, modulated signals, data symbols, etc.

[0683] Note that Figures 46 and 47 showing the "gNB configuration and NR-UE configuration" are merely examples and are not limited to these configurations.

[0684] The transmitting and receiving panel antennas (x705_1 to x705_M) in Fig. 46 may be configured with one antenna or multiple antennas. Furthermore, the transmitting and receiving panel antennas (x705_1 to x705_M) may be configured with one antenna element or multiple antenna elements. The transmitting and receiving panel antennas (x705_1 to x705_M) are not limited to the configuration described in this embodiment, and may, for example, have the configuration described in another embodiment.

[0685] The transmitting and receiving antennas (x805_1 to x805_m) in Fig. 47 may be configured with one antenna or multiple antennas. Also, the transmitting and receiving antennas (x805_1 to x805_m) may be configured with one antenna element or multiple antenna elements. The transmitting and receiving antennas (x805_1 to x805_m) are not limited to the configuration described in this embodiment.

[0686] In addition, when the transmitting / receiving panel antenna i of x705_i in Figure 46 is, for example, a shared transmitting panel antenna with the configuration of Figure 3 and a shared receiving panel antenna with the configuration of Figure 4, the transmitting antenna 306_1 in Figure 3 and the receiving antenna 401_1 in Figure 4 are shared, making one antenna, and multiplication units 304_1 and 403_1 are connected to this shared antenna.

[0687] Similarly, the transmitting antenna 306_2 in Fig. 3 and the receiving antenna 401_2 in Fig. 4 are shared to form one antenna, and the multiplication unit 304_2 and the multiplication unit 403_2 are connected to this shared antenna. Also, the transmitting antenna 306_3 in Fig. 3 and the receiving antenna 401_3 in Fig. 4 are shared to form one antenna, and the multiplication unit 304_3 and the multiplication unit 403_3 are connected to this shared antenna. And the transmitting antenna 306_4 in Fig. 3 and the receiving antenna 401_4 in Fig. 4 are shared to form one antenna, and the multiplication unit 304_4 and the multiplication unit 403_4 are connected to this shared antenna.

[0688] About Omni-directional Antennas:

[0689] When the gNB and NR-UE have the configuration of Figure 46, they will receive signals using one or more of the "transmitting and receiving panel antenna 1 of x705_1 to transmitting and receiving panel antenna M of x705_M."

[0690] In each of the transmitting and receiving panel antennas, "transmitting and receiving panel antenna 1 of x705_1 to transmitting and receiving panel antenna M of x705_M," the antennas that make up the transmitting and receiving panel antenna are set to a certain receiving beamforming (receiving directivity control).

[0691] It is not necessary to use all of the antennas that make up the transmitting and receiving panel antenna for receiving signals, and the settings for receiving beamforming (receiving directivity control) may or may not be fixed over time.

[0692] However, the method of using the transmitting and receiving panel antennas for omnidirectional reception is not limited to the above example.

[0693] When the gNB and NR-UE have the configuration of Figure 47, they will receive signals using one or more of "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m."

[0694] In each of the transmitting and receiving antennas "transmitting and receiving antenna 1 of x805_1 to transmitting and receiving antenna m of x805_m," the antennas that make up the transmitting and receiving antennas are set to a certain receiving beamforming (receiving directivity control).

[0695] It is not necessary to use all of the antennas constituting the transmitting and receiving antennas for receiving signals.

[0696] However, the method of using the transmitting and receiving antennas during omni-directional reception is not limited to the above example.

[0697] About omni-directional LBT:

[0698] 48 is a flow diagram showing an example of operation of a gNB in ​​omni-directional LBT. The gNB determines whether or not a signal has been detected omni-directionally (S5501).

[0699] When the gNB detects a signal in the omni-directional mode (xS5501: YES), the gNB waits for communication (xS5502). For example, the gNB determines that other devices (other gNBs, NR-UEs, APs, and first standard-UEs) are occupying channels in the licensed band and / or unlicensed band, and waits without transmitting a signal.

[0700] If the gNB does not detect a signal (cannot detect a signal) in the omni-directional mode (NO in xS5501), it starts communication (xS5503). For example, the gNB determines that other devices (other gNBs, NR-UEs, APs, and first standard-UEs) are not occupying channels in the licensed band and / or unlicensed band, and starts communication.

[0701] As a signal detection method, the gNB may determine that a signal is present if the received power is greater than a threshold, and that a signal is not present if the received power is less than the threshold. Alternatively, the gNB may determine that a signal is present if it can demodulate the signal, and that a signal is not present if it cannot demodulate the signal. Although two examples of signal detection methods have been described, the present invention is not limited to these examples. Furthermore, while the above describes an example of the operation of the gNB, the NR-UE also performs similar operations. Note that the signals detected by the gNB and NR-UE are based on the first standard, but may be signals other than the first standard.

[0702] About waiting:

[0703] When a signal is detected during omni-directional reception, the gNB and NR-UE may "standby." For example, as shown in xS5502 in Figure 48, the gNB and NR-UE will wait without transmitting a signal.

[0704] The gNB and NR-UE may start omni-directional LBT operation again after a certain time has elapsed. Alternatively, the gNB and NR-UE may perform omni-directional reception and, if a signal is detected, perform omni-directional reception again to check whether a signal is present.

[0705] About directional LBT:

[0706] 49 is a flow diagram showing an example of operation of a gNB in ​​directional LBT. The gNB determines whether or not a signal has been detected in a direction (xS5701).

[0707] When the gNB detects a signal in the directional direction (YES in xS5701), the gNB waits for communication (xS5702). For example, the gNB determines that other devices (other gNBs, NR-UEs, APs, and first standard-UEs) are occupying channels in the licensed band and / or unlicensed band, and waits without transmitting a signal.

[0708] If the gNB does not detect a signal (cannot detect a signal) in the directional direction (NO in xS5701), it starts communication (xS5703). For example, the gNB determines that other devices (other gNBs, NR-UEs, APs, and first standard-UEs) are not occupying channels in the "licensed band and / or unlicensed band," and starts communication.

[0709] As a signal detection method, the gNB may determine that a signal is present if the received power is greater than a threshold, and that a signal is not present if the received power is less than the threshold. Alternatively, the gNB may determine that a signal is present if it can demodulate the signal, and that a signal is not present if it cannot demodulate the signal. Although two examples have been described, the present invention is not limited to these examples. Also, while the above describes an example of the operation of the gNB, the NR-UE also performs similar operations. Note that the signals detected by the gNB and NR-UE are based on the first standard, but may be signals other than the first standard.

[0710] Fig. 50 is a flow diagram showing an example of operation of a gNB in ​​directional LBT. In Fig. 58, the gNB identifies a beam direction in which signal interference occurs. The gNB waits without transmitting a signal in the identified beam direction, and transmits a signal (starts communication) in directions other than the identified beam direction.

[0711] The gNB determines whether a signal has been detected in the direction (xS5801).

[0712] When the gNB detects a signal in a directional direction (YES in xS5801), the gNB determines beamforming parameters to be used for signal transmission (xS5802). For example, the gNB determines beamforming parameters in a direction other than the direction in which the signal was detected in the directional direction.

[0713] After determining the beamforming parameters at xS5802, the gNB starts or waits for communication using the determined beamforming parameters (xS5803). For example, the gNB determines that other devices (other gNBs, NR-UEs, APs, and first standard-UEs) are occupying channels in the licensed band and / or unlicensed band in the direction in which the signal was detected in the direction, and waits without transmitting a signal. The gNB determines that other devices (other gNBs, NR-UEs, APs, and first standard-UEs) are not occupying channels in the licensed band and / or unlicensed band in directions other than the direction in which the signal was detected in the direction, and starts communication.

[0714] If the gNB does not detect a signal (cannot detect a signal) in the directional direction (NO in xS5801), it starts communication (xS5804). For example, the gNB determines that other devices (other gNBs, NR-UEs, APs, and first standard-UEs) are not occupying channels in the "licensed band and / or unlicensed band," and starts communication.

[0715] As a signal detection method, the gNB may determine that a signal is present if the received power is greater than a threshold, and that a signal is not present if the received power is less than the threshold. Alternatively, the gNB may determine that a signal is present if it can demodulate the signal, and that a signal is not present if it cannot demodulate the signal. Although two examples have been described, the present invention is not limited to these examples. Also, while the above describes an example of the operation of the gNB, the NR-UE also performs similar operations. Note that the signals detected by the gNB and NR-UE are based on the first standard, but may be signals other than the first standard.

[0716] Regarding directional antennas:

[0717] When the gNB and NR-UE have the configuration of Figure 46, they will receive signals using one of the "transmitting and receiving panel antennas 1 of x705_1 to M of x705_M."

[0718] In detecting signals by directional reception, each transmitting panel antenna performs, for example, four types of reception beamforming (reception directivity control).

[0719] For example, when detecting a signal through directional reception, the gNB and NR-UE will perform receive beamforming (receive directivity control) using the first parameter, receive beamforming (receive directivity control) using the second parameter, receive beamforming (receive directivity control) using the third parameter, and receive beamforming (receive directivity control) using the fourth parameter at the transmit / receive panel antenna 1 of x705_1.

[0720] In addition, when detecting signals through directional reception, the gNB and NR-UE will perform receive beamforming (receive directivity control) using the fifth parameter, receive beamforming (receive directivity control) using the sixth parameter, receive beamforming (receive directivity control) using the seventh parameter, and receive beamforming (receive directivity control) using the eighth parameter at the transmit / receive panel antenna 2 of x705_2.

[0721] Therefore, when detecting a signal by directional reception, the transmit / receive panel antenna i of x705_i performs reception beamforming (reception directivity control) using the (4×i-3)th parameter, reception beamforming (reception directivity control) using the (4×i-2)th parameter, reception beamforming (reception directivity control) using the (4×i-1)th parameter, and reception beamforming (reception directivity control) using the (4×i)th parameter, where i is an integer between 1 and M.

[0722] The gNB and NR-UE then perform receive beamforming (control of receive directivity) using the first parameter to determine whether a signal is present. Therefore, the gNB and NR-UE use transmit / receive panel antenna 1 of x705_1.

[0723] The gNB and NR-UE perform receive beamforming (control of receive directivity) using the second parameter to determine whether a signal is present. Therefore, the gNB and NR-UE use transmit / receive panel antenna 1 of x705_1.

[0724] The gNB and NR-UE will perform receive beamforming (control of receive directivity) using the third parameter to determine whether a signal is present. Therefore, the gNB and NR-UE will use transmit / receive panel antenna 1 of x705_1.

[0725] The gNB and NR-UE will perform receive beamforming (control of receive directivity) using the fourth parameter to determine whether a signal is present. Therefore, the gNB and NR-UE will use transmit / receive panel antenna 1 of x705_1.

[0726] The gNB and NR-UE will perform receive beamforming (control of receive directivity) using the fifth parameter to determine whether a signal is present. Therefore, the gNB and NR-UE will use transmit / receive panel antenna 2 of x705_2.

[0727] The gNB and NR-UE will perform receive beamforming (control of receive directivity) using the sixth parameter to determine whether a signal is present. Therefore, the gNB and NR-UE will use transmit / receive panel antenna 2 of x705_2.

[0728] The gNB and NR-UE will perform receive beamforming (control of receive directivity) using the seventh parameter to determine whether a signal is present. Therefore, the gNB and NR-UE will use transmit / receive panel antenna 2 on x705_2.

[0729] The gNB and NR-UE will perform receive beamforming (control of receive directivity) using parameter 8 to determine whether a signal is present. Therefore, the gNB and NR-UE will use transmit / receive panel antenna 2 on x705_2.

[0730] Therefore, the gNB and NR-UE perform receive beamforming (control of receive directivity) using the (4×i-3)th parameter to determine whether a signal is present. Therefore, the gNB and NR-UE use transmit / receive panel antenna i of x705_i.

[0731] The gNB and NR-UE perform receive beamforming (control of receive directivity) using the (4×i-2)th parameter to determine whether a signal is present. Therefore, the gNB and NR-UE use transmit / receive panel antenna i of x705_i.

[0732] The gNB and NR-UE perform receive beamforming (control of receive directivity) using the (4×i-1)th parameter to determine whether a signal is present. Therefore, the gNB and NR-UE use transmit / receive panel antenna i of x705_i.

[0733] The gNB and NR-UE perform receive beamforming (control of receive directivity) using the (4 × i)th parameter to determine whether a signal is present. Therefore, the gNB and NR-UE use transmit / receive panel antenna i of x705_i.

[0734] Here, i is an integer between 1 and M inclusive.

[0735] Another example will be described. When the gNB and NR-UE have the configuration of Fig. 47, they perform receive beamforming (control of receive directivity) using one or more antennas from "transmit / receive antenna 1 of x805_1 to transmit / receive antenna m of x805_m" to receive signals.

[0736] When detecting signals by directional reception, g types of reception beamforming (reception directivity control) are performed using one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m," where g is an integer of 2 or greater.

[0737] The gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the first parameter to determine whether a signal is present.

[0738] The gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the second parameter to determine whether a signal is present.

[0739] The gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the third parameter to determine whether a signal is present.

[0740] The gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the fourth parameter to determine whether a signal is present.

[0741] The gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the fifth parameter to determine whether a signal is present.

[0742] The gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the sixth parameter to determine whether a signal is present.

[0743] The gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the seventh parameter to determine whether a signal is present.

[0744] The gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the eighth parameter to determine whether a signal is present.

[0745] Therefore, the gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmit / receive antenna m of x805_m" to perform receive beamforming (control of receive directivity) using the i-th parameter to check whether a signal is present, where i is an integer between 1 and g.

[0746] About waiting:

[0747] If a signal is detected during directional reception, the gNB and NR-UE may "stand by." For example, the gNB and NR-UE will stand by without transmitting any signals.

[0748] The gNB and NR-UE may start directional LBT operation again after a certain time has elapsed. Alternatively, the gNB and NR-UE may perform directional reception and, if a signal is detected, perform directional reception again to check whether a signal is present.

[0749] Regarding "Determine beamforming parameters to use" in S5802 in Figure 50:

[0750] The following explanation will be given separately for the case where the gNB and NR-UE have the configuration shown in Figure 46 and the case where they have the configuration shown in Figure 47.

[0751] (1) When the gNB and NR-UE have the configuration of Figure 46:

[0752] As mentioned above, the gNB and NR-UE will perform receive beamforming (receive directivity control) using the (4×i-3)th parameter to determine whether a signal is present.

[0753] In addition, the gNB and NR-UE will perform receive beamforming (receive directivity control) using the (4×i-2)th parameter to determine whether a signal is present.

[0754] The gNB and NR-UE then perform receive beamforming (receive directivity control) using the (4×i-1)th parameter to determine whether a signal is present.

[0755] The gNB and NR-UE will perform receive beamforming (receive directivity control) using the (4×i)th parameter to determine whether a signal is present.

[0756] Here, i is an integer between 1 and M inclusive.

[0757] When the gNB and NR-UE confirm the presence of a signal, they shall not transmit a modulated signal using the parameters at that time. When the gNB and NR-UE cannot confirm the presence of a signal (when a signal is not detected), they shall be able to transmit a modulated signal using the parameters at that time.

[0758] For example, the gNB and NR-UE perform receive beamforming (control of receive directivity) using the first parameter to determine whether a signal is present. At this time, the gNB and NR-UE use transmit / receive panel antenna 1 of x705_1.

[0759] Then, when the gNB and the NR-UE detect a signal, they do not transmit a modulated signal using the first parameter. When the gNB and the NR-UE do not detect a signal, they are able to transmit a modulated signal using the first parameter.

[0760] For example, the gNB and NR-UE perform receive beamforming (control of receive directivity) using the fifth parameter to determine whether a signal is present. At this time, the gNB and NR-UE use transmit / receive panel antenna 2 of x705_2.

[0761] Then, when the gNB and the NR-UE detect a signal, they do not transmit a modulated signal using the fifth parameter. When the gNB and the NR-UE do not detect a signal, they are able to transmit a modulated signal using the fifth parameter.

[0762] Similar processing is performed on the beamforming parameters in other reception intervals.

[0763] (2) When the gNB and NR-UE have the configuration of Figure 47:

[0764] As mentioned above, the gNB and NR-UE use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmit / receive antenna m of x805_m" to perform receive beamforming (control of receive directivity) using the i-th parameter to check whether a signal is present, where i is an integer between 1 and g.

[0765] When the gNB and NR-UE detect a signal, they do not transmit a modulated signal using the parameters at that time. When the gNB and NR-UE do not detect a signal, they can transmit a modulated signal using the parameters at that time.

[0766] For example, as shown in Figure 59A, the gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" to perform receive beamforming (receive directivity control) using the first parameter to determine whether a signal is present.

[0767] Then, when the gNB and the NR-UE detect a signal, they do not transmit a modulated signal using the first parameter. When the gNB and the NR-UE do not detect a signal, they are able to transmit a modulated signal using the first parameter.

[0768] Furthermore, for example, the gNB and NR-UE will use one or more antennas from "transmitting / receiving antenna 1 of x805_1 to transmitting / receiving antenna m of x805_m" as shown in Figure 59B to perform receive beamforming (receive directivity control) using the fifth parameter to confirm whether a signal is present or not.

[0769] Then, when the gNB and the NR-UE detect a signal, they shall not transmit a signal modulated using the fifth parameter. When the gNB and the NR-UE do not detect a signal, they may transmit a signal modulated using the fifth parameter.

[0770] Similar processing is performed on the beamforming parameters in other reception intervals.

[0771] The gNB and NE-UE may perform omni-directional LBT and directional LBT. The omni-directional LBT method and the directional LBT method are not limited to the above examples.

[0772] Next, a specific example of operation at the time of multiple-TRP will be described.

[0773] Figure 51A shows an example of the state of communication between TRP#1, TRP#2, and NR-UE. Note that in Figure 51A, the same numbers are used for elements that operate in the same way as in Figure 39.

[0774] It is assumed that TRP#1 of 3902_1 and NR-UE 3901 are communicating with each other. Specifically, TRP#1 of 3902_1 transmits a modulated signal to NR-UE 3901. In addition, NR-UE 3901 transmits a modulated signal to TRP#1 of 3902_1.

[0775] It is assumed that TRP#2 of 3902_2 and NR-UE 3901 are communicating with each other. Specifically, TRP#2 of 3902_2 transmits a modulated signal to NR-UE 3901.

[0776] Figure 51B shows an example of the state of communication between TRP#1, TRP#2, and NR-UE, which is different from Figure 51A. Note that in Figure 51B, the same numbers are used for elements that operate in the same way as in Figure 39.

[0777] It is assumed that TRP#2 of 3902_2 is communicating with NR-UE 3901. Specifically, TRP#2 of 3902_2 transmits a modulated signal to NR-UE 3901. Also, assume that AP 5102 and UE 5101 are communicating with each other. Specifically, AP 5102 transmits, for example, a modulated signal conforming to the first standard to UE 5101. UE 5101 then transmits, for example, a modulated signal conforming to the first standard to AP 5102.

[0778] It is assumed that TRP#1 of 3902_1 and NR-UE 3901 are communicating.

[0779] At this time, NR-UE 3901 performs LBT processing, such as omni-directional LBT or directional LBT, and, for example, since a modulated signal of the first standard is detected, it does not transmit a modulated signal to TRP#1 of 3902_1.

[0780] In addition, TRP#1 of 3902_1 performs LBT processing, such as omni-directional LBT or directional LBT, and since a modulated signal such as a modulated signal of the first standard is not detected, it transmits a modulated signal to NR-UE 3901.

[0781] Here, as explained using Figure 51A, communication begins between "TRP#1, TRP#2 and NR-UE", but we will explain the operation when a state exists in which "AP5102 and UE5101 are communicating" as shown in Figure 51B.

[0782] Assume that the communication state between TRP#1, TRP#2, and NR-UE is as shown in Figure 51A. In this case, for example, as shown in Figure 52, TRP#1, TRP#2, and NR-UE perform sector sweep-related processing, that is, TRP#1, TRP#2, and NR-UE perform transmit beamforming and receive beamforming.

[0783] Figure 52 shows the state of communication on the time axis related to sector sweep between TRP#i of 3902_i and NR-UE 3901. Here, i is 1 or 2, and in Figure 52, the horizontal axis represents time.

[0784] 52, TRP#i of 3902_i and NR-UE 3901 communicate for sector sweep-related processing in sector sweep-related communication section 5201. Note that the specific method of communication for sector sweep-related processing has already been explained, so explanation will be omitted.

[0785] This determines the "method of transmit beamforming and receive beamforming for TRP#1 of 3902_1" and the "method of transmit beamforming and receive beamforming for NR-UE3901" for communication between TRP#1 of 3902_1 and NR-UE3901, thereby enabling communication with good reception quality to be established.

[0786] In addition, the "method of transmit beamforming and receive beamforming for TRP#2 of 3902_2" and the "method of transmit beamforming and receive beamforming for NR-UE3901" for communication between TRP#2 of 3902_2 and NR-UE3901 are determined, and communication with good reception quality can be established.

[0787] As described above, the NR-UE 3901 performs LBT processing, such as omni-directional LBT or directional LBT, to check for the presence of a signal. If no signal is present, the NR-UE 3901 transmits a modulated signal to the TRP#i of the 3902_i. Note that i is, for example, 1 or 2.

[0788] As shown in Fig. 53, the NR-UE 3901...

Claims

1. a transmitter for transmitting first information regarding a transmission beam of a first transmitting / receiving point and second information regarding a transmission beam of a second transmitting / receiving point; a receiver that receives information regarding whether or not there is a suitable beam among the transmission beams of the first transmitting / receiving point determined based on the first information, and whether or not there is a suitable beam among the transmission beams of the second transmitting / receiving point determined based on the second information. Radio equipment.

2. the first information is information about a plurality of transmit beams, and the second information is information about a plurality of transmit beams; 10. The wireless device of claim 1.

3. transmitting information regarding whether or not there is a suitable beam among the transmission beams of the first transmitting / receiving point, and control information regarding whether or not there is a suitable beam among the transmission beams of the second transmitting / receiving point; 10. The wireless device of claim 1.

4. At the same time, there is a beam suitable for communication with the first transmitting / receiving point and a beam suitable for communication with the second transmitting / receiving point.

10. The wireless device of claim 1.

5. Transmitting first information regarding a transmission beam of a first transmitting / receiving point and second information regarding a transmission beam of a second transmitting / receiving point; receiving information regarding whether or not there is a suitable beam among the transmission beams of the first transmitting / receiving point determined based on the first information, and whether or not there is a suitable beam among the transmission beams of the second transmitting / receiving point determined based on the second information; Communication method.

6. the first information is information about a plurality of transmit beams, and the second information is information about a plurality of transmit beams; The communication method according to claim 5.

7. transmitting information regarding whether there is a suitable beam among the transmission beams of the first transmitting / receiving point and information regarding whether there is a suitable beam among the transmission beams of the second transmitting / receiving point; The communication method according to claim 5.

8. At the same time, there is a beam suitable for communication with the first transmitting / receiving point and a beam suitable for communication with the second transmitting / receiving point. The communication method according to claim 5.

9. transmitting first information regarding a transmission beam of a first transmitting / receiving point and second information regarding a transmission beam of a second transmitting / receiving point; and receiving information regarding whether or not there is a suitable beam among the transmission beams of the first transmitting / receiving point determined based on the first information, and whether or not there is a suitable beam among the transmission beams of the second transmitting / receiving point determined based on the second information. Integrated circuit.

Images