Terminal, communication method, and integrated circuit

Abstract

This wireless communication system comprises: a first wireless communication device that transmits a plurality of first reference signals having controlled directivity by the orthogonal frequency division multiple access (OFDMA) method in a first period; and a second wireless communication device that transmits a plurality of second reference signals having controlled directivity to the first wireless communication device in a second period, the second reference signals including information relating to directivity and corresponding to any one or more of the first reference signals received from the first wireless communication device.

Description

Wireless communication system, wireless communication device, and wireless communication method

[0001] The present disclosure relates to a wireless communication system, a wireless communication device, and a wireless communication method.

[0002] For example, a communication system using a frequency of 52.6 GHz or higher is known as a communication system using the 60 GHz band.

[0003] A communication method for increasing the communication distance is described in Patent Document 1. Figure 88 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, followed by the wireless communication device 051 which transmits a sector sweep signal, and 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 communicable distance between the wireless communication device 001 and the wireless communication device 051, but in an environment where multiple wireless communication devices exist, there remains a problem in improving the data transmission efficiency of the entire system of a communication system made up of multiple wireless communication devices.

[0006] Special table 2018-518855 publication

[0007] Non-limiting examples of the present disclosure contribute to providing a technique for improving data transmission speed when multiple wireless communication devices exist.

[0008] A wireless communication system according to one aspect of the present disclosure includes a first wireless communication device that transmits, during a first period, a plurality of first reference signals with controlled directivity using an Orthogonal Frequency Division Multiple Access (OFDMA) method, and a second wireless communication device that transmits, during a second period, a plurality of second reference signals with controlled directivity to the first wireless communication device, the second reference signals including information regarding the directivity corresponding to at least one of the first reference signals received from the first wireless communication device.

[0009] A wireless communication device according to one aspect of the present disclosure includes a receiving processing unit that receives, during a first period, a plurality of first reference signals whose directivity is controlled by another wireless communication device using an Orthogonal Frequency Division Multiple Access (OFDMA) method, and a transmitting processing unit that transmits, during a second period, a plurality of second reference signals whose directivity is controlled and includes information regarding the directivity corresponding to any one of the first reference signals, to the other wireless communication device.

[0010] A wireless communication device according to one aspect of the present disclosure includes a transmission processing unit that transmits, during a first period, a plurality of first reference signals with controlled directivity using an Orthogonal Frequency Division Multiple Access (OFDMA) method, and a reception processing unit that receives, during a second period, at least one of a plurality of second reference signals, the second reference signals including information regarding the directivity corresponding to one of the first reference signals, and the directivity of which has been controlled by another wireless communication device that received the first reference signal.

[0011] A wireless communication method according to one aspect of the present disclosure includes a first wireless communication device transmitting, during a first period, a plurality of first reference signals with controlled directivity using an Orthogonal Frequency Division Multiple Access (OFDMA) method, and a second wireless communication device transmitting, during a second period, a plurality of second reference signals with controlled directivity, each of which includes information regarding the directivity corresponding to one of the first reference signals received from the first wireless communication device, to the first wireless communication device.

[0012] 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.

[0013] According to non-limiting examples of the present disclosure, data transmission speeds are improved when multiple wireless communication devices are present.

[0014] 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.

[0015] 1A, 1B, and 1C. FIG. 1A shows an example of the configuration of a transmission panel antenna i in FIGS. 1A, 1B, and 1C. FIG. 1B shows an example of the configuration of a reception panel antenna i in FIGS. 1A, 1B, and 1C. FIG. 1A shows an example of the configuration of a transmission device when the OFDM system is used. FIG. 1B shows an example of the configuration of a reception device when the OFDM system is used. FIG. 1C shows an example of the configuration of a reception device when the DFT-based single carrier system is used. FIG. 1C shows an example of the configuration of a reception device when the time domain-based single carrier system is used. FIG. 1B shows an example of a communication state in embodiment 1. FIG. 9 shows an example of a modulated signal transmitted by base station #1 in FIG. 9. 11 shows an example of the configuration of the "sector sweep reference signal in the transmission panel antenna i for frequency ♭p" in FIG. 11. FIG. 12 shows an example of the configuration of the "sector sweep reference signal in the transmission panel antenna i for frequency ♭p" in FIG. 11. FIG. 13 shows an example of the terminal occupation in the transmission interval of the "sector sweep reference signal" for the terminal shown in FIG. 13. FIG. 15A shows an example of the configuration of the "sector sweep reference signal in the transmission panel antenna xi of terminal #i" in FIG. 15A. FIG. 16A 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. FIG. 16B shows an example of the allocation of specific feedback signals to the feedback signals shown in FIG. 16A.FIG. 17A showing an example of the configuration of a frame including data symbols transmitted by base station #1. FIG. showing an example of the assignment of specific modulation signals (slots) to a frame including the data symbols shown in FIG. 17A. FIG. showing an example of the situation when base station #1 is communicating with "Terminal #1 to Terminal #6". FIG. showing examples of the transmission status of the modulation signals of base station #1 after FIG. 18 and the transmission status of the modulation signals of terminals such as "Terminal #1 to Terminal #6". FIG. showing a configuration example of a "frame including data symbols" transmitted by Terminal #1. FIG. showing a configuration example of a "frame including data symbols" transmitted by Terminal #2. FIG. showing a configuration example of a "frame including data symbols" transmitted by Terminal #3. FIG. showing a configuration example of a "frame including data symbols" transmitted by Terminal #4. FIG. showing a configuration example of a "frame including data symbols" transmitted by Terminal #5. FIG. showing a configuration example of a "frame including data symbols" transmitted by Terminal #6. FIG. showing an example related to terminal occupancy in the transmission section of the "sector sweep reference signal" for terminals shown in FIG. 13, which is different from FIG. 14. FIG. showing an example related to terminal occupancy in the transmission section of the "sector sweep reference signal" for terminals shown in FIG. 13, which is different from FIG. 14. FIG. showing an example of the "sector sweep reference signal" of Terminal #3. FIG. showing another example of the "sector sweep reference signal" of Terminal #3. FIG. showing an example of the operation in the time interval from time t1 to t2, which is the terminal response interval. FIG. showing an example related to terminal occupancy in the transmission section of the "sector sweep reference signal" for terminals shown in FIG. 23. FIG. showing configuration examples of "frames including data symbols" transmitted by terminals such as Terminal #1 to Terminal #6. FIG. showing an example related to terminal occupancy in the transmission section of the "sector sweep reference signal" for terminals shown in FIG. 23, which is different from FIG. 24. FIG. showing an example of the modulation signal transmitted by base station #1 in FIG. 9. FIG. showing the first example of the configuration of the feedback signal group transmitted by base station #1 existing in the time interval from t2 to t3 in FIG. 27. FIG. showing the first example of the configuration of the feedback signal group transmitted by base station #1 existing in the time interval from t2 to t3 in FIG. 27. FIG. showing the first example of the configuration of the frame group including data symbols transmitted by base station #1 existing in the time interval from t4 to t5 in FIG. 27. FIG. showing the first example of the configuration of the frame group including data symbols transmitted by base station #1 existing in the time interval from t4 to t5 in FIG. 27. Existing in the time interval from t4 to t5 in FIG. 27,27 is a diagram showing a first example of the configuration of a frame group including data symbols transmitted by base station #1. FIG. 27 is a diagram showing a second example of the configuration of a feedback signal group transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. FIG. 27 is a diagram showing a second example of the configuration of a feedback signal group transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. FIG. 27 is a diagram showing a second example of the configuration of a frame group including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27. 27. FIG. 28 shows a second example of the configuration of a frame group including a data symbol transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. FIG. 29 shows a third example of the configuration of a feedback signal group transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. FIG. 30 shows a third example of the configuration of a frame group including a data symbol transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27. 27. FIG. 27 shows a fourth example of the configuration of a feedback signal group transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. FIG. 27 shows a fourth example of the configuration of a feedback signal group transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. FIG. 27 shows a fourth example of the configuration of a frame group including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27. FIG. 27 shows a fourth example of the configuration of a frame group including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27 is a diagram showing a fifth example of the configuration of a group of feedback signals transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27; FIG. 27 is a diagram showing a fifth example of the configuration of a group of frames including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27; FIG. 27 is a diagram showing a sixth example of the configuration of a group of feedback signals transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27; FIG. 27 is a diagram showing a sixth example of the configuration of a group of frames including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27;27. A diagram showing a seventh example of the configuration of a group of feedback signals transmitted by base station #1. A diagram showing a seventh example of the configuration of a group of frames including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27. A diagram showing an example of a situation when base station #1 and "terminals such as terminal #1" are communicating in FIG. 9. A diagram showing an example of the transmission status of modulated signals from base station #1 and "terminals such as terminal #1" from FIG. 42 onwards. A diagram showing a first example of the configuration of a "group of frames including data symbols". A diagram showing a first example of the configuration of a "group of frames including data symbols". A diagram showing a second example of the configuration of a "group of frames including data symbols". A diagram showing a second example of the configuration of a "group of frames including data symbols". A diagram showing a third example of the configuration of a "group of frames including data symbols". A diagram showing a third example of the configuration of a "group of frames including data symbols". A diagram showing a fourth example of the configuration of a "group of frames including data symbols". A diagram showing a fourth example of the configuration of a "group of frames including data symbols". A diagram showing a fifth example of the configuration of a "group of frames including data symbols". A sixth example of the configuration of a "group of frames including data symbols". 14. FIG. 24. FIG. 25. FIG. 26. FIG. 27. FIG. 28. FIG. 29. FIG. 30. FIG. 31. FIG. 32. FIG. 33. FIG. 34. FIG. 35. FIG. 36. FIG. 37. FIG. 38. FIG. 39. FIG. 40. FIG. 41. FIG. 42. FIG. 43. FIG. 44. FIG. 45. FIG. 46. FIG. 47. FIG. 48. FIG. 49. FIG. 50. FIG. 51. FIG. 52. FIG. 53. FIG. 54.60A is a diagram showing an example of the configuration of a frame including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 10; 61A is a diagram showing an example of the allocation of specific modulated signals (slots) to the frame including data symbols shown in FIG. 61A; 61A is a diagram showing an example of the configuration of a "frame including data symbols" transmitted by terminal #1; 61B is a diagram showing an example of the configuration of a "frame including data symbols" transmitted by terminal #2; 61C is a diagram showing an example of the configuration of a "frame including data symbols" transmitted by terminal #3; 61D is a diagram showing an example of the configuration of a "frame including data symbols" transmitted by terminal #4; 61E is a diagram showing an example of the configuration of a "frame including data symbols" transmitted by terminal #5; 61F is a diagram showing an example of the configuration of a "frame including data symbols" transmitted by terminal #6; 27. A diagram showing an eighth example of the configuration of a feedback signal group transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. A diagram showing an eighth example of the configuration of a feedback signal group transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. A diagram showing an eighth example of the configuration of a frame group including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27. A diagram showing an eighth example of the configuration of a frame group including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27. 27 is a diagram showing a ninth example of the configuration of a group of feedback signals transmitted by base station #1, which exists in the time interval from t2 to t3 in FIG. 27. FIG. 27 is a diagram showing a ninth example of the configuration of a group of frames including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27. FIG. 27 is a diagram showing a ninth example of the configuration of a group of frames including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 27.27. FIG. 28 shows a tenth example of the configuration of a group of feedback signals transmitted by base station #1. FIG. 29 shows a tenth example of the configuration of a group of frames including data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in FIG. 27. FIG. 30 shows an eleventh example of the configuration of a "group of frames including data symbols". FIG. 31 shows an eleventh example of the configuration of a "group of frames including data symbols". FIG. 32 shows an eleventh example of the configuration of a "group of frames including data symbols". FIG. 33 shows an eleventh example of the configuration of a "group of frames including data symbols". FIG. 34 shows an eleventh example of the configuration of a "group of frames including data symbols". FIG. 35 shows an eleventh example of the configuration of a "group of frames including data symbols". FIG. 36 shows an eleventh example of the configuration of a "group of frames including data symbols". FIG. 37 shows an eleventh example of the configuration of a "group of frames including data symbols". 78A and 78B. FIG. 78A shows an example of the configuration of a frame including data symbols transmitted by base station #1, which exists in the time interval from t4 to t5 in FIG. 10. FIG. 79A shows an example of the configuration of a transmission interval of a modulated signal (slot) in a transmission panel antenna X for frequency $X in FIG. 79A. FIG. 79A shows an example of the configuration of a transmission interval of a modulated signal (slot) in a transmission panel antenna X for frequency $X in FIG. 79A. FIG. 79A shows an example of the allocation of specific modulated signals (slots) to frames including data symbols shown in FIG. 79A and 79B.79B shows an example of allocation of specific modulation signals (slots) to frames including data symbols shown in FIG. 79B. FIG. 79C shows an example of the configuration of a "frame including data symbols" transmitted by terminal #1. FIG. 79D shows an example of the configuration of a "frame including data symbols" transmitted by terminal #2. FIG. 79E shows an example of the configuration of a "frame including data symbols" transmitted by terminal #3. FIG. 79F shows an example of the configuration of a "frame including data symbols" transmitted by terminal #4. FIG. 79G shows an example of the configuration of a "frame including data symbols" transmitted by terminal #5. FIG. 79H shows an example of the configuration of a "frame including data symbols" transmitted by terminal #6. FIG. 77A shows an example of terminal occupancy in the transmission interval of a "sector sweep reference signal" for terminals shown in FIG. 13, which is different from that in FIG. 77A. FIG. 77F shows an example of terminal occupancy in the transmission interval of a "sector sweep reference signal" for terminals shown in FIG. 13, which is different from that in FIG. 77A. 84A and 84B. FIG. 84A shows an example of the structure of a frame including data symbols transmitted by base station #1 in the time interval from t4 to t5 in FIG. 10. FIG. 85A shows an example of the structure of a "modulation signal (slot) at transmission panel antenna X for frequency $X" in FIG. 85A. FIG. 85A shows an example of the structure of a "modulation signal (slot) at transmission panel antenna X for frequency $X" in FIG. 85A. FIG. 85A shows an example of the structure of a frame including data symbols transmitted by base station #1 in the time interval from t4 to t5 in FIG. 10. FIG. 85A shows an example of the structure of a "modulation signal (slot) at transmission panel antenna X for frequency $X" in FIG. 85A. FIG. 85B shows an example of the allocation of specific modulation signals (slots) to frames including data symbols in FIG. 85A and 85B.FIG. 85B shows an example of the assignment of specific modulation signals (slots) to a frame including data symbols. FIG. shows a configuration example of a "frame including data symbols" transmitted by terminal #1. FIG. shows a configuration example of a "frame including data symbols" transmitted by terminal #2. FIG. shows a configuration example of a "frame including data symbols" transmitted by terminal #3. FIG. shows a configuration example of a "frame including data symbols" transmitted by terminal #4. FIG. shows a configuration example of a "frame including data symbols" transmitted by terminal #5. FIG. shows a configuration example of a "frame including data symbols" transmitted by terminal #6. FIG. shows an example related to the occupancy of a terminal in the "sector sweep reference signal for terminal" shown in FIG. 58, which is different from FIG. 82B. FIG. shows an example related to the occupancy of a terminal in the "sector sweep reference signal for terminal" shown in FIG. 58, which is different from FIG. 82B. FIG. shows an example of the communication state of a wireless communication device according to the prior art.

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0017] (Embodiment 1) The communication system, communication device, and communication method of Embodiment 1 will be described in detail.

[0018] FIG. 1A shows an example of the configuration of a communication device such as a base station, access point, terminal, repeater, etc. in Embodiment 1.

[0019] The communication device in FIG. 1A is assumed to include N transmission units from "transmission unit 102_1 to transmission unit 102_N". Here, N is an integer of 1 or more or an integer of 2 or more.

[0020] Also, the communication device in FIG. 1A is assumed to include M transmission panel antennas for M transmissions from "transmission panel antenna 1 of 106_1 to transmission panel antenna M of 106_M". Here, M is an integer of 1 or more or an integer of 2 or more.

[0021] The communication device in FIG. 1A is assumed to include n reception units from "reception unit 155_1 to reception unit 155_n". Here, n is an integer of 1 or more or an integer of 2 or more.

[0022] 1A includes 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.

[0023] The i-th transmitter 102_i receives the control signal 100 and the i-th data 101_i as input, performs processing such as error correction coding and mapping according to a modulation method, and outputs the i-th modulated signal 103_i, where i is an integer greater than or equal to 1 and less than or equal to N.

[0024] 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.

[0025] 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.

[0026] The j-th transmission signal 105_j is then output as a radio wave from the transmission panel antenna j of 106_j. Note that the transmission panel antenna j of 106_j may receive the 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.

[0027] 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.

[0028] The second processing unit 153 receives the ith received signal 152_i and the control signal 100, performs processing such as frequency conversion, and outputs the jth signal-processed signal 154_j. Note that the ith received signal 152_i may contain no signal, and the jth signal-processed signal 154_j may contain no signal.

[0029] The jth receiving unit 155_j receives the jth signal processed signal 154_j and the control signal 100 as input, and performs processing 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.

[0030] 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.

[0031] The third processing unit 158 ​​receives the j-th control data 156_j as input, generates the control signal 100 based on information obtained from the communication partner, and outputs it.

[0032] 1A may perform processing for transmit beamforming (transmit directivity control), such as precoding. Furthermore, the second processing unit 153 may perform processing for receive directivity control. As another example, the first processing unit 104 may process the first transmission signal 105_1 as the first modulated signal 103_1, the second transmission signal 105_2 as the second modulated signal 103_2, and the third transmission signal 105_3 as the third modulated signal 103_3, and output the signals. Alternatively, the first processing unit 104 may process the first transmission signal 105_1 as the second modulated signal 103_2, and output the signals. The second processing unit 153 may also 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.

[0033] 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, which transmits multiple modulated signals (multiple streams) using multiple antennas. Furthermore, the communication device of FIG. 1A (and FIGS. 1B and 1C) may perform transmission corresponding to multi-user MIMO transmission, which transmits modulated signals to multiple terminals during at least a first time interval using a first frequency (band).

[0034] Fig. 1B shows an example of a configuration of a communication device, such as a base station, an access point, a terminal, or a repeater, according to the first embodiment, which is different from that shown in Fig. 1A. In Fig. 1B, components that operate in the same manner as in Fig. 1A are given the same numbers, and detailed description thereof will be omitted.

[0035] 1B is characterized in that the number of transmitters and the number of transmitting panel antennas are the same. 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.

[0036] The number of receiving units is assumed to be the same as the number of receiving panel antennas. In this case, the second processing unit 153 may perform processing for receiving directivity control. The second processing unit 153 may also output the xth signal processed signal 154_x as the 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.

[0037] 1C shows an example of a configuration of a communication device, such as a base station, an access point, a terminal, or a repeater, according to the first embodiment, which is different from that shown in FIGS. 1A and 1B. In FIG. 1C, components that operate in the same manner as those in FIG. 1A are given the same reference numerals, and detailed description thereof will be omitted.

[0038] 1C is characterized in 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.

[0039] 1A, 1B, and 1C are examples of the configuration of communication devices such as base stations, access points, terminals, and repeaters, and the configuration method of the communication devices is not limited to these examples.

[0040] 2 shows an example of the configuration of the i-th transmitter 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.

[0041] 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.

[0042] 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.

[0043] The other signal generating section 206 receives the control signal 200 as an input, generates and outputs the other signal 207 based on the control signal.

[0044] 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.

[0045] 3 shows an example of the configuration of the transmitting panel antenna i of 106_i in FIGS. 1A, 1B, and 1C. Note that i is assumed to be "an integer greater than or equal to 1 and less than or equal to 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. Note that 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."

[0046] 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.

[0047] 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 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.

[0048] Multiplication unit 304_2 receives second transmission signal 303_2 and control signal 300 as input, multiplies second transmission signal 303_2 by a multiplication coefficient based on control signal 300, generates and outputs coefficient-multiplied second transmission signal 305_2, and outputs coefficient-multiplied second transmission signal 305_2 as a radio wave from antenna 306_2.

[0049] 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.

[0050] The multiplier 304_3 receives the third transmission signal 303_3 and the control signal 300, multiplies the third transmission signal 303_3 by a multiplication coefficient based on the control signal 300, and generates and outputs the coefficient-multiplied third transmission signal 305_3. The coefficient-multiplied third transmission signal 305_3 is then output as a radio wave from the antenna 306_3.

[0051] 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 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.

[0052] Multiplication unit 304_4 receives fourth transmission signal 303_4 and control signal 300 as input, multiplies fourth transmission signal 303_4 by a multiplication coefficient based on control signal 300, generates and outputs coefficient-multiplied fourth transmission signal 305_4, and outputs coefficient-multiplied fourth transmission signal 305_4 as a radio wave from antenna 306_4.

[0053] 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 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.

[0054] It should be noted that the absolute values ​​of w1, w2, w3, and w4 may be equal to each other. This is equivalent to a phase change. Naturally, the absolute values ​​of w1, w2, w3, and w4 do not have to be equal to each other.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 4 shows an example of the configuration of the receiving panel antenna i of 151_i in FIGS. 1A, 1B, and 1C, where i is an integer greater than or equal to 1 and less than or equal to m.

[0059] The multiplication unit 403_1 receives the first received signal 402_1 received by the antenna 401_1 and the control signal 400 as input, multiplies the first received signal 402_1 by a multiplication coefficient based on the control signal 400, and outputs the first received signal 404_1 after the coefficient multiplication.

[0060] A more specific explanation will be given. The first received signal 402_1 is represented as rx1(t). Here, t is time. If the multiplication coefficient is d1, the first received signal 404_1 after coefficient multiplication can be represented as rx1(t)×d1. Note that rx1(t) can be represented as a complex number, and therefore may be a real number. Furthermore, d1 can be represented as a complex number, and therefore may be a real number.

[0061] 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.

[0062] A more specific explanation will be given. The second received signal 402_2 is represented as rx2(t). Here, t is time. If the multiplication coefficient is d2, the second received signal 404_2 after coefficient multiplication can be represented as rx2(t)×d2. Note that rx2(t) can be represented as a complex number, and therefore may be a real number. Furthermore, d2 can be represented as a complex number, and therefore may be a real number.

[0063] The multiplication unit 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.

[0064] A more specific explanation will be given. The third received signal 402_3 is represented as rx3(t). Here, t is time. If the multiplication coefficient is d3, the third received signal 404_3 after coefficient multiplication can be represented as rx3(t)×d3. Note that rx3(t) can be represented as a complex number, and therefore may be a real number. Furthermore, d3 can be represented as a complex number, and therefore may be a real number.

[0065] The multiplication unit 403_4 receives the fourth received signal 402_4 received by the antenna 401_4 and the control signal 400 as input, multiplies the fourth received signal 402_4 by a multiplication coefficient based on the control signal 400, and outputs the fourth received signal 404_4 after the coefficient multiplication.

[0066] A more specific explanation will be given. The fourth received signal 402_4 is represented as rx4(t). Here, t is time. If the multiplication coefficient is d4, the fourth received signal 404_4 after coefficient multiplication can be represented as rx4(t)×d4. Note that rx4(t) can be represented as a complex number, and therefore may be a real number. Furthermore, d4 can be represented as a complex number, and therefore may be a real number.

[0067] The coupling / combining unit 405 receives as input the first received signal 404_1 after coefficient multiplication, the second received signal 404_2 after coefficient multiplication, the third received signal 404_3 after coefficient multiplication, and the fourth received signal 404_4 after coefficient multiplication, combines the first received signal 404_1 after coefficient multiplication, the second received signal 404_2 after coefficient multiplication, the third received signal 404_3 after coefficient multiplication, and the fourth received signal 404_4 after coefficient multiplication, and outputs a modulated signal 406. Note that the modulated signal 406 is expressed as rx1(t)×d1+rx2(t)×d2+rx3(t)×d3+rx4(t)×d4.

[0068] Control signal 400 corresponds to control signal 100. Modulated signal 406 corresponds to the ith received signal 152_i.

[0069] 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.

[0070] 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.

[0071] Furthermore, the receiving panel antenna in Figure 4 is described as being composed of four antennas (and four multiplication units) as an example, but the number of antennas is not limited to four, and it may be composed of two or more antennas.

[0072] 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.

[0073] In this embodiment, in the case where Figures 1A, 1B, and 1C are, for example, communication devices such as base stations and gNBs (g Node Bs), they are assumed to support multicarrier transmission such as the OFDM (Orthogonal Frequency Division Multiplexing) transmission method. In addition, the base stations and gNBs in Figures 1A, 1B, and 1C may support OFDMA (Orthogonal Frequency Division Multiple Access).

[0074] 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.

[0075] Constellation mapper 501 receives, for example, data as input, performs mapping based on a set modulation method, and outputs a modulated signal.

[0076] 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.

[0077] 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 an inverse Fourier transform.

[0078] 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.

[0079] In this embodiment, in the case of a communication device such as a base station or a gNB, for example, 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). Below, an example of the configuration of the receiving part of the single carrier method will be described.

[0080] Fig. 6 shows an example of the configuration of a receiving device when using the OFDM system. As shown in Fig. 6, the 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.

[0081] A receive FE processing unit (Rx FE processing) 601 performs receive front-end processing.

[0082] The FFT 602 performs FFT processing on the input signal.

[0083] The parallel-serial conversion unit 603 converts a parallel signal into a serial signal. If a serial signal is already obtained, the parallel-serial conversion unit 603 does not need to be present.

[0084] The demapper 604 performs demodulation processing based on the transmission method and modulation scheme.

[0085] 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.

[0086] 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.

[0087] 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 composed of a receiving FE processing unit (Rx (Receiver) FE processing) 801, down-sampling and match filtering 802, TDE (Time Domain Equalization) 803, CP removal unit (CP Removal) 804, and demapper 805. Note that other processing units may also be present in the receiving device.

[0088] 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).

[0089] 9 shows an example of a communication state in the first embodiment. As shown in FIG. 9, consider a case where 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.

[0090] In the following, an example will be described in which a base station uses OFDMA to transmit modulated signals to terminals.

[0091] Figure 10 shows an example of a modulated signal 1000 transmitted by base station #1 901_1 in Figure 9. In Figure 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.

[0092] The time period from time t1 to time t2 is a terminal response period. The terminal response will be explained later.

[0093] In the time period from time t2 to time t3, there is a feedback signal 1002. The feedback signal 1002 will be explained later.

[0094] 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.

[0095] 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.

[0096] FIG. 11 shows an example of a sector sweep reference signal 1001 shown in FIG. 10 transmitted by base station #1 901_1 in FIG. 9 having the configurations shown in FIGS. 1A, 1B, and 1C. In FIG. 11, the horizontal axis represents time and the vertical axis represents frequency. In the example shown in FIG. 11, base station #1 901_1 transmits a modulated signal based on OFDMA, and therefore is divided into frequency bands ♭1, ♭2, ..., ♭K, as shown in FIG. 11. Note that 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 two or more (sub)carriers. This point may be the same in other drawings and other embodiments.

[0097] For example, in frequency band ♭1, there is a sector sweep reference signal 1101_11 at transmitting panel antenna 1 for frequency ♭1 in the first time interval, a sector sweep reference signal 1101_12 at transmitting panel antenna 2 for frequency ♭1 in the second time interval, ..., a sector sweep reference signal 1101_1M at transmitting panel antenna M for frequency ♭1 in the Mth time interval.

[0098] Therefore, in frequency band ♭i, there is a sector sweep reference signal 1101_i1 at transmitting panel antenna 1 for frequency ♭i in the first time interval, a sector sweep reference signal 1101_i2 at transmitting panel antenna 2 for frequency ♭i in the second time interval, ..., a sector sweep reference signal 1101_iM at transmitting panel antenna M for frequency ♭i in the Mth time interval, where i is an integer between 1 and K.

[0099] Note that sector sweep reference signal 1101_ij in 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.

[0100] One feature of this method is that in FIG. 11, in the i-th time interval, 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.

[0101] 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.

[0102] 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.

[0103] The "reference signal 1201_1 based on the first parameter in the transmitting panel antenna i for frequency ♭p" will be described.

[0104] When base station #1 901_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 #1 901_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 #1 901_1 transmits tx1ref1(t)×w1(i,1) from antenna 306_1 in FIG. 3, where t is time.

[0105] When base station #1 901_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 #1 901_1 sets the multiplication coefficient in multiplier 304_2 at transmitting panel antenna i for 106_i to w2(i,1). If second transmission signal 303_2 for "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 #1 901_1 transmits tx2ref1(t)×w2(i,1) from antenna 306_2 shown in FIG. 3.

[0106] When base station #1 901_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 #1 901_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 for "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 #1 901_1 transmits tx3ref1(t)×w3(i,1) from antenna 306_3 shown in FIG. 3.

[0107] When base station #1 901_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 #1 901_1 sets the multiplication coefficient in multiplier 304_4 at transmitting panel antenna i for 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 designated as tx4ref1(t), multiplier 304_4 obtains tx4ref1(t)×w4(i,1). Then, base station #1 901_1 transmits tx4ref1(t)×w4(i,1) from antenna 306_4 shown in FIG. 3.

[0108] The "reference signal 1201_j based on the j-th parameter in the transmitting panel antenna i for frequency ♭p" will be described.

[0109] When base station #1 901_1 transmits "reference signal 1201_j based on the jth parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 901_1 sets the multiplication coefficient in multiplier 304_1 at transmitting panel antenna i 106_i to w1(i,j). If first transmission signal 303_1 for "reference signal 1201_j based on the jth parameter at transmitting panel antenna i for frequency ♭p" is tx1refj(t), multiplier 304_1 obtains tx1refj(t)×w1(i,j). Then, base station #1 901_1 transmits tx1refj(t)×w1(i,j) from antenna 306_1 shown in FIG. 3, where t is time.

[0110] When base station #1 901_1 transmits "reference signal 1201_j based on the j-th parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 901_1 sets the multiplication coefficient in multiplier 304_2 at transmitting panel antenna i 106_i to w2(i,j). If second transmission signal 303_2 for "reference signal 1201_j based on 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 #1 901_1 transmits tx2refj(t)×w2(i,j) from antenna 306_2 shown in FIG. 3.

[0111] When base station #1 901_1 transmits "reference signal 1201_j based on the j-th parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 901_1 sets the multiplication coefficient in multiplier 304_3 at transmitting panel antenna i for 106_i to w3(i,j). If third transmission signal 303_3 for "reference signal 1201_j based on 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 #1 901_1 transmits tx3refj(t)×w3(i,j) from antenna 306_3 shown in FIG. 3.

[0112] When base station #1 901_1 transmits "reference signal 1201_j based on the j-th parameter at transmitting panel antenna i for frequency ♭p" shown in FIG. 12, base station #1 901_1 sets the multiplication coefficient in multiplier 304_4 at transmitting panel antenna i for 106_i to w4(i,j). If fourth transmission signal 303_4 in "reference signal 1201_j based on 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 #1 901_1 transmits tx4refj(t)×w4(i,j) from antenna 306_4 in FIG. 3.

[0113] 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 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.

[0114] 11 and 12, when base station #1 901_1 transmits "sector sweep reference signal 1101_i in transmitting panel antenna i for frequency ♭p," the "reference signal 1201_j based on the j-th parameter in transmitting panel antenna i for frequency ♭p" includes, for example, the following information: - ID (identification number) of the transmitting panel antenna (equivalent to i here, for example) - Identification number (ID) of the parameter used in beamforming (directivity control) (equivalent to j here, for example) - Number of time divisions in which the terminal can transmit the sector sweep reference signal when transmitting the sector sweep reference signal (this will be explained later).

[0115] 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: - Information about the frequency band and / or frequency ♭p (which may include information about the number of frequency divisions) (Note that this point will be explained later.)

[0116] When base station #1 of 901_1 transmits 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.

[0117] It should be noted that "when a terminal transmits a sector sweep reference signal, the number of time divisions in which the sector sweep reference signal can be transmitted" 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.

[0118] 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.

[0119] 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, as an example, an explanation will be given of 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 overlap.

[0120] 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 #1 902_1, terminal #2 902_2, terminal #3 902_3, terminal #4 902_4, terminal #5 902_5, and terminal #6 902_6 in Fig. 9 transmit sector sweep reference signals in the time interval from time t1 to t2, which is the terminal response interval.

[0121] 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 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, as shown in FIG.

[0122] Therefore, in the case of Figure 13, base station #1 of 901_1 sets the number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting the reference signal for sector sweep to 4.

[0123] 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.

[0124] 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 from 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 "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.

[0125] 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." Furthermore, it is assumed that terminal #1 of 902_1 has estimated that the "frequency domain" with good reception quality is frequency band ♭K.

[0126] 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 sector sweep reference signal can be transmitted when the terminal transmits 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 sector sweep reference signal can be transmitted when the terminal transmits the sector sweep reference signal" is 4.

[0127] 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, suppose terminal #1 of 902_1 obtains "0" using the 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 "terminal-specific "sector sweep reference signal" first (= "0" + 1) transmission interval 1301_1" 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, or an integer or natural number unique to the terminal. 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.

[0128] 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 parameter 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 point will be explained later.

[0129] 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 from 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 "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 #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." Furthermore, it is assumed that terminal #2 of 902_2 has estimated that the "frequency domain" with good reception quality is frequency band ♭1.

[0131] 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.

[0132] In this case, terminal #2 of 902_2 uses a random number to obtain, for example, one of the values ​​"0," "1," "2," or "3." For example, assume that 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 "terminal "sector sweep reference signal" second (="1" + 1) transmission interval 1301_2" in FIG. 14.

[0133] 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." Furthermore, 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.

[0134] 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 "ID of the parameter used in beamforming (directivity control)" contained therein. Note that, for example, i is an integer equal to or greater than 1. Furthermore, information on the "frequency band and / or frequency ♭p" contained in sector sweep reference signal 1001 may also be used.

[0135] 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 parameter 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.

[0136] 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 sector sweep reference signal can be transmitted when the terminal transmits 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 sector sweep reference signal can be transmitted when the terminal transmits the sector sweep reference signal" is 4.

[0137] 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, assume that terminal #i of 902_i obtains "yi" using a random number. Note that yi takes one of the values ​​"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 .

[0138] It is assumed that the "sector sweep reference signal" 1401_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 parameter 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 point will be explained later.

[0139] As shown in FIG. 14 , terminal #i's "sector sweep reference signal" 1401_i may be assigned to multiple frequency bands. For example, terminal #3's "sector sweep reference signal" 1401_3 is assigned to frequency band ♭1 and frequency band ♭2. As another example, terminal #i's "sector sweep reference signal" 1401_i may be assigned to frequency band ♭1 and frequency band ♭K, so that terminal #i's "sector sweep reference signal" 1401_i may be assigned to discrete frequency bands. (Therefore, terminal #i's "sector sweep reference signal" 1401_i will be assigned to one or more frequency bands.)

[0140] 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.

[0141] The configuration of terminal #i "sector sweep reference signal" 1401_i transmitted by terminal #i of 902_i explained using FIG. 14 will be described. For simplicity of explanation, terminal #i of 902_i is assumed to have the configurations of FIGS. 1A, 1B, and 1C. Furthermore, terminal #i of 902_i having the configurations of FIGS. 1A, 1B, and 1C is assumed to have the configuration of 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 of FIGS. 1A, 1B, and 1C, and the configuration of transmitting panel antenna xi of terminal #i of 902_i having the configurations of FIGS. 1A, 1B, and 1C is not limited to FIG. 3.

[0142] Terminal #i of 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.

[0143] 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."

[0144] For example, terminal #i of 902_i having the configuration of Figures 1A, 1B, and 1C transmits a "sector sweep reference signal 1501_1 in transmission panel antenna 1 of terminal #i" using transmission panel antenna 1 of 106_1.

[0145] 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.

[0146] 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 (where N is an integer equal to or greater than 1).

[0147] Fig. 15B shows an example of the configuration of "sector sweep reference signal 1501_xi at transmission panel antenna xi of terminal #i" in Fig. 15A. Note that in Fig. 15, the horizontal axis represents time.

[0148] As shown in Figure 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."

[0149] 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.

[0150] The "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" will be described.

[0151] 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.

[0152] When terminal #i of group 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902_i sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna xi of group 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 group 902_i transmits tx2ref1(t) × w2(xi,1) from antenna 306_2 of FIG. 3.

[0153] When terminal #i of group 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902_i sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna xi of group 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 group 902_i transmits tx3ref1(t) × w3(xi,1) from antenna 306_3 of FIG. 3.

[0154] When terminal #i of group 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902_i sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of group 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 group 902_i transmits tx4ref1(t) × w4(xi,1) from antenna 306_4 of FIG. 3.

[0155] The "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" will be described.

[0156] 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 the 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.

[0157] When terminal #i of group 902 transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902 sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna xi of group 106_xi to w2(xi,j). If second transmission signal 303_2 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" is tx2refj(t), multiplier 304_2 obtains tx2refj(t) × w2(xi,j). Then, terminal #i of group 902 transmits tx2refj(t) × w2(xi,j) from antenna 306_2 of FIG. 3.

[0158] When terminal #i of group 902 transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902 sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna xi of group 106_xi to w3(xi,j). If third transmission signal 303_3 in "reference signal 1511_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 group 902 transmits tx3refj(t) × w3(xi,j) from antenna 306_3 of FIG. 3.

[0159] When terminal #i of group 902 transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902 sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of group 106_xi to w4(xi,j). If the 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 group 902 transmits tx4refj(t) × w4(xi,j) from antenna 306_4 of FIG. 3.

[0160] 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.

[0161] 14, 15A, and 15B, when terminal #i of 902_i transmits "reference signal 1501_xi for sector sweep at transmitting panel antenna xi of terminal #i," the "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" includes, for example, the following information: - Information on the "transmitting panel antenna and parameters" of base station #1 of 901_1, which has good reception quality as described above.

[0162] 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 "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" in Figure 15A.

[0163] 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, which has good reception quality."

[0164] In this case, even if the base station #1 of 901_1 uses an omni-antenna, for example, it is highly likely that it will be able to receive any of the following signals transmitted by the terminal #i of 902_i: "Sector sweep reference signal 1501_1 at terminal #i's transmitting panel antenna 1," "Sector sweep reference signal 1501_2 at terminal #i's transmitting panel antenna 2," ..., "Sector sweep reference signal 1501_M at terminal #i's transmitting panel antenna M" in FIG. 15A. 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, which has good reception quality, and the terminal #i of 902_i can receive the modulated signal with high reception quality.

[0165] 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.

[0166] 14, 15A, and 15B, when terminal #i of 902_i transmits "reference signal 1501_xi for sector sweep in transmitting panel antenna xi of terminal #i," "reference signal 1511_j based on the j-th parameter in transmitting panel antenna xi" may include, for example, the following information: - ID (identification number) 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)

[0167] When terminal #i of 902_i transmits the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directional 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 (directional 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.

[0168] 14, 15A, and 15B, when terminal #i of 902_i transmits "sector sweep reference signal 1501_xi at terminal #i's transmitting panel antenna xi," the "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" may include, for example, the following information: - "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.

[0169] 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 reception quality of data.

[0170] 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."

[0171] FIG. 16A shows an example of the configuration of a 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. 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. 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.

[0172] In addition, in FIG. 16A, it is assumed that the feedback signal 1002 includes frequency bands ♭1, ♭2, . . . , and ♭K.

[0173] Therefore, the first transmission interval includes a first transmission interval 1601_11 of a feedback signal for frequency ♭1, a first transmission interval 1601_21 of a feedback signal for frequency ♭2, ..., a first transmission interval 1601_K1 of a feedback signal for frequency ♭K. Similarly, the second transmission interval includes a second transmission interval 1601_12 of a feedback signal for frequency ♭1, a second transmission interval 1601_22 of a feedback signal for frequency ♭2, ..., a second transmission interval 1601_K2 of a feedback signal for frequency ♭K. The third transmission interval includes a third transmission interval 1601_13 of a feedback signal for frequency ♭1, a third transmission interval 1601_23 of a feedback signal for frequency ♭2, ..., a third transmission interval 1601_K3 of a feedback signal for frequency ♭K. In the fourth transmission interval, there are a fourth transmission interval 1601_14 for a feedback signal for frequency ♭1, a fourth transmission interval 1601_24 for a feedback signal for frequency ♭2, . . . , a fourth transmission interval 1601_K4 for a feedback signal for frequency ♭K.

[0174] One feature is that "in FIG. 16A, in the i-th time interval, the feedback signal is transmitted from the same transmitting panel antenna regardless of the frequency band."

[0175] FIG. 16B shows an example of a specific feedback signal assignment for the feedback signal 1002 shown in FIG. 16A.

[0176] For example, as shown in FIG. 14, terminal #1 at 902_1 transmits terminal #1 "sector sweep reference signal" 1401_1, terminal #2 at 902_2 transmits terminal #2 "sector sweep reference signal" 1401_2, terminal #3 at 902_3 transmits terminal #3 "sector sweep reference signal" 1401_3, terminal #4 at 902_4 transmits terminal #4 "sector sweep reference signal" 1401_4, terminal #5 at 902_5 transmits terminal #5 "sector sweep reference signal" 1401_5, and terminal #6 at 902_6 transmits terminal #6 "sector sweep reference signal" 1401_6.

[0177] 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.

[0178] As shown in FIG. 14, the "sector sweep reference signal" 1401_2 of terminal #2 exists in frequency band ♭1, and therefore in FIG. 16B, the feedback signal 1611_2 addressed to terminal #2 exists in frequency band ♭1.

[0179] 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. 16B, the feedback signal 1611_3 addressed to terminal #3 exists in frequency bands ♭1 and ♭2.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] In this way, by receiving the feedback signal 1611_i addressed to terminal #i, terminal #i of 902_i can know that communication with 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 feedback signal 1611_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.

[0184] 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 Figure 10 includes symbols addressed to terminal #i of 902_i).

[0185] 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.

[0186] 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 . Note that 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 a 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 a sector sweep reference signal" is Ω, the frame 1003 including data symbols 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.

[0187] Also, in FIG. 17A, it is assumed that frame 1003 including data symbols includes frequency band ♭1, frequency band ♭2, . . . , frequency band ♭K.

[0188] 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, ..., 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, ..., 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, ..., 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.

[0189] FIG. 17B shows an example of specific modulation signal (slot) allocation for frame 1003 including the data symbols shown in FIG. 17A.

[0190] For example, as shown in FIG. 14, terminal #1 at 902_1 transmits terminal #1 "sector sweep reference signal" 1401_1, terminal #2 at 902_2 transmits terminal #2 "sector sweep reference signal" 1401_2, terminal #3 at 902_3 transmits terminal #3 "sector sweep reference signal" 1401_3, terminal #4 at 902_4 transmits terminal #4 "sector sweep reference signal" 1401_4, terminal #5 at 902_5 transmits terminal #5 "sector sweep reference signal" 1401_5, and terminal #6 at 902_6 transmits terminal #6 "sector sweep reference signal" 1401_6.

[0191] As shown in FIG. 14, since the "sector sweep reference signal" 1401_1 of terminal #1 exists in frequency band ♭K, in FIG. 17B, the modulated signal (slot) 1711 addressed to terminal #1 exists in frequency band ♭K.

[0192] As shown in FIG. 14, since the "sector sweep reference signal" 1401_2 of terminal #2 exists in frequency band ♭1, in FIG. 17B, the modulated signal (slot) 1712 addressed to terminal #2 exists in frequency band ♭1.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] In this way, terminal #i of 902_i can know that communication with base station #1 of 901_1 is now possible through modulated signal (slot) 171i addressed to terminal #i, and can also know the frequency band to be used. Note that Figure 17B is merely an example, and for example, if modulated signal (slot) 1711 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.

[0199] 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 the beamforming parameters, and transmits modulated signal (slot) 171i addressed to terminal #i.

[0200] In addition, in Figures 16A and 16B, base station #1 of 901_1 receives the ``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.

[0201] As a result, terminal #i of 902_i selects a frequency (band) and a transmitting panel antenna based on the 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.

[0202] 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, which includes information such as ACK (acknowledgement), indicating that the signal from base station #1 of 901_1 has been received.

[0203] 17B , in addition to data symbols, the modulated signal (slot) 171i addressed to terminal #i may include, for example, "reference signals such as demodulation reference signal (DMRS), phase tracking reference signal (PTRS), and sounding reference signal (SRS)," pilot symbols, pilot signals, preambles, and symbols containing control information. Possible symbols containing control information include information on the destination terminal (an ID that can identify the terminal), a method for transmitting the modulated signal, information on the modulation scheme, information on the error correction coding scheme (code length, coding rate, etc.), and information on the MCS (Modulation and Coding Scheme).

[0204] 18 shows an example of a situation when 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 from base station #1 of 901_1, and FIG. 18(B) shows an example of a transmission situation of a modulated signal from "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.

[0205] First, base station #1 901_1 transmits a sector sweep reference signal 1801_1. Note that this has already been explained using FIG. 10, so further explanation will be omitted.

[0206] 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 Figures 13, 14, 15A, 15B, etc., so further explanation will be omitted.

[0207] The base station #1 of the terminal 901_1 transmits a feedback signal 1802_1. Note that this point has already been explained using Figs. 16A and 16B, so further explanation will be omitted.

[0208] Thereafter, base station #1 of 901_1 transmits "frame 1803_1 including data symbols." Note that this point has already been explained using Figures 17A and 17B, so further explanation will be omitted. (Therefore, "frame 1803_1 including data symbols" is considered to be, for example, a frame for downlink.)

[0209] 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 using Figures 20A to 20F. (Therefore, "frame 1852_1 including data symbols" is considered to be, for example, a frame for uplink.)

[0210] Next, base station #1 of 901_1 transmits "frame 1803_2 including data symbols." Note that the method of configuring "frame 1803_2 including data symbols" is as described with reference to FIGS. 17A and 17B.

[0211] 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 explained later using Figures 20A to 20F.

[0212] Figure 19 shows an example of the transmission status of modulated signals from base station #1 901_1 in Figure 18 onwards, and the transmission status of modulated signals from terminals such as "terminal #1 902_1, terminal #2 902_2, terminal #3 902_3, terminal #4 902_4, terminal #5 902_5, and terminal #6 902_6".

[0213] FIG. 19A shows an example of a transmission status of a modulated signal from the base station #1 901_1, which is a continuation in time of the transmission status of a modulated signal from the base station #1 901_1 in FIG. 18A.

[0214] 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).

[0215] In addition, in FIGS. 19(A) and 19(B), the horizontal axis represents time.

[0216] 18A and 18B, 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.

[0217] 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 symbols." Note that the configuration of this frame will be explained later using Figures 20A to 20F.

[0218] Next, base station #1 of 901_1 transmits a sector sweep reference signal 1801_2. Note that this point has already been explained using FIG. 10, so further explanation will be omitted.

[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 sector sweep reference signals 1851_2. Note that this point has already been explained using Figures 13, 14, 15A, 15B, etc., so further explanation will be omitted.

[0220] The base station #1 of the terminal 901_1 transmits a feedback signal 1802_2. Note that this point has already been explained using Figs. 16A and 16B, so further explanation will be omitted.

[0221] Thereafter, base station #1 of 901_1 transmits “frame 1803_4 including data symbol.” Note that this point has already been explained using FIGS. 17A and 17B, so further explanation will be omitted.

[0222] 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." Note that the configuration of this frame will be explained later using Figures 20A to 20F.

[0223] 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," a reference signal for sector sweep is transmitted again, and the frequency (band) is set, the transmitting panel antenna to be used is selected, and the transmitting beamforming is set, thereby enabling the base station and / or terminals to obtain high data reception quality.

[0224] Next, configuration examples 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.

[0225] 20A, 20B, 20C, 20D, 20E, and 20F, it is assumed that a "frame 1852_i including a data symbol" 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 the "frame 1852_i including a data symbol" includes frequency bands ♭1, ♭2, ..., and ♭K.

[0226] As shown in FIG. 20A, for example, terminal #1 of 902_1 transmits terminal #1 transmission frame 2001_1 (including a data symbol) using frequency band ♭K and the first transmission interval.

[0227] Note that "terminal #1 of 902_1 is transmitting terminal #1 transmission frame 2001_1 (including a data symbol) using frequency band ♭K," because "base station #1 of 901_1 is transmitting a modulated signal (slot) addressed to terminal #1 of 902_1 using frequency band ♭K," as shown in FIG. 17B.

[0228] Also, as shown in FIG. 20B, for example, terminal #2 of 902_2 transmits terminal #2 transmission frame 2001_2 (including a data symbol) using frequency band ♭1 and the second transmission interval.

[0229] Note that "terminal #2 of 902_2 is transmitting terminal #2 transmission frame 2001_2 (including data symbols) 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.

[0230] As shown in FIG. 20C, for example, terminal #3 of 902_3 transmits terminal #3 transmission frame 2001_3 (including a data symbol) using frequency bands ♭1 and ♭2 and the third transmission interval.

[0231] 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.

[0232] As shown in FIG. 20D, for example, terminal #4 of 902_4 transmits terminal #4 transmission frame 2001_4 (including a data symbol) using frequency band ♭2 and the first transmission interval.

[0233] Note that "terminal #4 of 902_4 is transmitting terminal #4 transmission frame 2001_4 (including data symbols) 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.

[0234] 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.

[0235] 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.

[0236] As shown in FIG. 20F, for example, terminal #6 of 902_6 transmits terminal #6 transmission frame 2001_6 (including a data symbol) using frequency band ♭K and the third transmission interval.

[0237] Note that "terminal #6 of 902_6 is transmitting terminal #6 transmission frame 2001_6 (including a data symbol) using frequency band ♭K," because, as shown in FIG. 17B, "base station #1 of 901_1 is transmitting a modulated signal (slot) addressed to terminal #6 of 902_6 using frequency band ♭K."

[0238] 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.

[0239] 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, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information may be included.

[0240] 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)).

[0241] Figure 14 shows an example of terminal occupation of the ``first transmission section 1301_1 of the ``sector sweep reference signal'' for the terminal, the second transmission section 1301_2 of the ``sector sweep reference signal'' for the terminal, the third transmission section 1301_3 of the ``sector sweep reference signal'' for the terminal, and the fourth transmission section 1301_4 of the ``sector sweep reference signal'' for the terminal'' shown in Figure 13.

[0242] 21A and 21B illustrate an example of terminal occupation of 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, which is different from FIG. 14.

[0243] 21A and 21B, components that operate in the same manner as those in FIGS. 13 and 14 are assigned the same numbers and have already been described, so a description thereof will be omitted. Below, differences from the description in FIG. 14 will be described.

[0244] Terminal #2 at 902_2 in Figure 9 receives sector sweep reference signal 1001 transmitted by base station #1 at 901_1, and obtains a "frequency (band)" with good reception quality, an "ID (identification) of the transmitting panel antenna," and an "identification number (ID) of the parameter used in beamforming (directivity control)," thereby being able to communicate with base station #1 at 901_1.

[0245] Terminal #2 of 902_2 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a2 and parameters b2."

[0246] 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. 21A, 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.

[0247] In this case, terminal #2 of 902_2 uses a random number to obtain, for example, one of the values ​​"0," "1," "2," or "3." For example, assume that terminal #2 of 902_2 obtains "2" using a random number. In this case, since "2" + 1 = 3, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" 1401_2 using frequency band ♭1 and "terminal "sector sweep reference signal" third transmission interval 1301_3," as shown in FIG. 21A.

[0248] It is assumed that the "sector sweep reference signal" 1401_2 of 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."

[0249] Terminal #3 at 902_3 in Figure 9 receives sector sweep reference signal 1001 transmitted by base station #1 at 901_1, and obtains a "frequency (band)" with good reception quality, an "ID (identification) of the transmitting panel antenna," and an "identification number (ID) of the parameter used in beamforming (directivity control)," thereby enabling communication with base station #1 at 901_1.

[0250] Terminal #3 of 902_3 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a3 and parameters b3."

[0251] Furthermore, terminal #3 of 902_3 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. 21B, terminal #3 of 902_3 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.

[0252] In this case, terminal #3 of 902_3 uses a random number to obtain, for example, one of the values ​​"0," "1," "2," or "3." For example, terminal #3 of 902_3 obtains "2" using a random number. In this case, since "2" + 1 = 3, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" 1401_3 using frequency band ♭1 and "terminal "sector sweep reference signal" third transmission interval 1301_3," as shown in FIG. 21B.

[0253] It is assumed that the "sector sweep reference signal" 1401_3 of terminal #3 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, i.e., information on the "transmitting panel antenna a3 and parameters b3."

[0254] At this time, as shown in Figures 21A and 21B, the time intervals of "terminal #2 "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2" and "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3" overlap.

[0255] Therefore, there is a possibility that base station #1 of 901_1 may simultaneously receive terminal #2's "sector sweep reference signal" 1401_2 and terminal #3's "sector sweep reference signal" 1401_3.

[0256] In this case, the following two cases are possible.

[0257] <Case 1> Both the "terminal #2 "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2" and the "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3" have the configurations shown in Figures 15A and 15B.

[0258] At this time, when base station #1 of 901_1 receives "terminal #2 "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2," the "transmission panel antenna and beamforming parameters of terminal #2 of 902_2" with good reception quality is different from "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3" with good reception quality when base station #1 of 901_1 receives "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3." Therefore, it is assumed that base station #1 of 901_1 has obtained the information contained in "terminal #2 "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2" and the information contained in "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3."

[0259] In this case, for example, in FIG. 16A, the second transmission section 1601_12 of the feedback signal for frequency ♭1 is a signal addressed to terminal #2 of 902_2, and the third transmission section 1601_13 of the feedback signal for frequency ♭1 is a signal addressed to terminal #3 of 902_3.

[0260] Also, for example, in Figure 17A, "the second transmission section 1701_12 of the modulated signal (slot) for frequency ♭1 is a signal addressed to terminal #2 of 902_2" and "the third transmission section 1701_13 of the modulated signal (slot) for frequency ♭1 is a signal addressed to terminal #3 of 902_3."

[0261] In this way, the base station #1 of 901_1 can communicate with the terminal #2 of 902_2 and the terminal #3 of 902_3.

[0262] <Case 2> Both the "terminal #2 "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2" and the "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3" have the configurations shown in Figures 15A and 15B.

[0263] At this time, when base station #1 of 901_1 receives terminal #2's "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2, the "transmitting panel antenna and beamforming parameters of terminal #2 of 902_2" with good reception quality, and when base station #1 of 901_1 receives terminal #3's "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3, the "transmitting panel antenna and beamforming parameters of terminal #3 of 902_3" with good reception quality are assumed to interfere with each other.

[0264] <Case 2-1> There is a case where base station #1 of 901_1 obtains either the information contained in "Terminal #2 'Sector Sweep Reference Signal' 1401_2 transmitted by Terminal #2 of 902_2" or the information contained in "Terminal #3 'Sector Sweep Reference Signal' 1401_3 transmitted by Terminal #3 of 902_3."

[0265] For example, it is assumed that the base station #1 of 901_1 has obtained information contained in the "terminal #2 'sector sweep reference signal' 1401_2 transmitted by terminal #2 of 902_2."

[0266] In this case, for example, in FIG. 16A, the second transmission section 1601_12 of the feedback signal for frequency ♭1 is set as a signal addressed to terminal #2 of 902_2.

[0267] Also, for example, in FIG. 17A, the second transmission interval 1701_12 of the modulated signal (slot) for frequency ♭1 is set as a signal addressed to terminal #2 of 902_2.

[0268] In this way, the base station #1 of 901_1 can communicate with (terminal #1 of 902_1) and terminal #2 of 902_2.

[0269] The operation of terminal #3 of 902_3 will be described.

[0270] Assume that the sector sweep reference signal 1851_1 in Fig. 18 is in the state shown in Fig. 21A and Fig. 21B. Therefore, frames 1803_1, 1803_2, and 1803_3 including data symbols in Fig. 18 do not include a frame (slot) addressed to terminal #3 of 902_3.

[0271] In this case, terminal #3 at 902_3 in Figure 9 receives sector sweep reference signal 1801_2 in Figure 19 transmitted by base station #1 at 901_1, and obtains a "frequency (band)" with good reception quality, an "ID (identification) of the transmitting panel antenna," and an "identification number (ID) of the parameter used in beamforming (directivity control)," thereby being able to communicate with base station #1 at 901_1.

[0272] Terminal #3 of 902_3 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a3 and parameters b3."

[0273] Furthermore, while making these estimates, terminal #3 of 902_3 also 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." Terminal #3 of 902_3 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.

[0274] In this case, terminal #3 of 902_3 uses a random number to obtain one of the values ​​"0," "1," "2," or "3." For example, terminal #3 of 902_3 generates a random number using a different seed than the previous time and obtains "3." In this case, since "3" + 1 = 4, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" 1401_3 using frequency band ♭1 and fourth transmission interval 1301_4 of the terminal "sector sweep reference signal," as shown in FIG. 22A.

[0275] It is assumed that the "sector sweep reference signal" 1401_3 of terminal #3 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, i.e., information on the "transmitting panel antenna a3 and parameters b3."

[0276] At this time, as shown in FIG. 22A, base station #1 of 901_1 receives "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3," and thereafter performs the aforementioned predetermined procedure, and base station #1 of 901_1 and terminal #3 of 902_3 communicate with each other.

[0277] As another example, terminal #3 of 902_3 estimates that the "frequency (band)" with good reception quality is frequency band ♭K, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a3 and parameter b3."

[0278] At this time, as shown in Fig. 22B, base station #1 of 901_1 receives "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3," and thereafter performs the predetermined procedure described above, and base station #1 of 901_1 and terminal #3 of 902_3 communicate with each other. This is because "terminal #3 "sector sweep reference signal" 1401_3 can be prevented from interfering with terminal #2 "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2 in Fig. 21A."

[0279] <Case 2-2> There may be cases where base station #1 of 901_1 is unable to obtain both the information contained in "Terminal #2 "Sector Sweep Reference Signal" 1401_2 transmitted by terminal #2 of 902_2" and the information contained in "Terminal #3 "Sector Sweep Reference Signal" 1401_3 transmitted by terminal #3 of 902_3."

[0280] 18, assume that the state shown in Figures 21A and 21B is reached, and base station #1 of 901_1 is unable to obtain both the information contained in "terminal #2 'sector sweep reference signal' 1401_2 transmitted by terminal #2 of 902_2" and the information contained in "terminal #3 'sector sweep reference signal' 1401_3 transmitted by terminal #3 of 902_3." In this case, frames 1803_1, 1803_2, and 1803_3 containing data symbols in Figure 18 do not include a frame (slot) addressed to terminal #2 of 902_2 or a frame (slot) addressed to terminal #3 of 902_3.

[0281] In this case, terminal #2 at 902_2 in Figure 9 receives sector sweep reference signal 1801_2 in Figure 19 transmitted by base station #1 at 901_1, and obtains the "frequency (band)," "ID (identification) of the transmitting panel antenna," and "ID of the parameter used in beamforming (directivity control)" with good reception quality, thereby being able to communicate with base station #1 at 901_1.

[0282] Terminal #2 of 902_2 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a2 and parameters b2."

[0283] Furthermore, while making these estimates, terminal #2 of 902_2 also 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." 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.

[0284] In this case, terminal #2 of 902_2 uses a random number to obtain one of the values ​​"0," "1," "2," or "3." For example, terminal #2 of 902_2 generates a random number using a different seed than the previous time and obtains "2." In this case, since "2" + 1 = 3, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" 1401_2 using frequency band ♭1 and "terminal "sector sweep reference signal" third transmission interval 1301_3," as shown in FIG. 21A.

[0285] It is assumed that the "sector sweep reference signal" 1401_2 of 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 b3."

[0286] At this time, as shown in FIG. 21A, base station #1 of 901_1 receives "terminal #2 "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2," and thereafter performs the aforementioned predetermined procedure, and base station #1 of 901_1 and terminal #2 of 902_2 communicate with each other.

[0287] Similarly, terminal #3 at 902_3 in Figure 9 receives sector sweep reference signal 1801_2 in Figure 19 transmitted by base station #1 at 901_1, and obtains a "frequency (band)" with good reception quality, an "ID (identification) of the transmitting panel antenna," and an "identification number (ID) of the parameter used in beamforming (directivity control)," thereby being able to communicate with base station #1 at 901_1.

[0288] Terminal #3 of 902_3 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a3 and parameters b3."

[0289] Furthermore, while making these estimates, terminal #3 of 902_3 also 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." Terminal #3 of 902_3 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.

[0290] In this case, terminal #3 of 902_3 uses a random number to obtain one of the values ​​"0," "1," "2," or "3." For example, terminal #3 of 902_3 generates a random number using a different seed than the previous time and obtains "3." In this case, since "3" + 1 = 4, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" 1401_3 using frequency band ♭1 and "terminal "sector sweep reference signal" fourth transmission interval 1301_4," as shown in FIG. 22A.

[0291] It is assumed that the "sector sweep reference signal" 1401_3 of terminal #3 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, i.e., information on the "transmitting panel antenna a3 and parameters b3."

[0292] At this time, as shown in FIG. 22A, base station #1 of 901_1 receives "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3," and thereafter performs the aforementioned predetermined procedure, and base station #1 of 901_1 and terminal #3 of 902_3 communicate with each other.

[0293] As another example, terminal #3 of 902_3 estimates that the "frequency (band)" with good reception quality is frequency band ♭K, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a3 and parameter b3."

[0294] At this time, as shown in Fig. 22B, base station #1 of 901_1 receives "terminal #3 "sector sweep reference signal" 1401_3 transmitted by terminal #3 of 902_3," and thereafter performs the predetermined procedure described above, and base station #1 of 901_1 and terminal #3 of 902_3 communicate with each other. This is because "terminal #3 "sector sweep reference signal" 1401_3 can be prevented from interfering with terminal #2 "sector sweep reference signal" 1401_2 transmitted by terminal #2 of 902_2 in Fig. 21A."

[0295] By doing the above, it is possible to further 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.

[0296] As described above in the first embodiment, a terminal can transmit a sector sweep reference signal so as to reduce the number of collisions, thereby improving the communication capacity of a system made up of a base station and terminals. 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 the receiving panel antenna are not limited to those shown in Figures 3 and 4, and may be any antenna configuration that can generate, for example, one or more or multiple transmitting and receiving directivities. Also, in Figures 10, 11, 12, 13, 14, 15A, 15B, 16A, 16B, 17A, 17B, 18, 19, 20A, 20B, 20C, 20D, 20E, 20F, 21A, 21B, 22A, and 22B, signals, frames, etc. are present, but the names are not limited to these, and the function of the signal itself being transmitted is important.

[0297] (Embodiment 2) In this embodiment 2, an example in which a terminal performs transmission using a single carrier method will be described as a modification of embodiment 1. Note that in the following description of embodiment 2, the figures shown in embodiment 1 may be used.

[0298] Figures 1A, 1B, and 1C show examples of the configuration of, for example, a base station, an access point, a terminal, and a repeater in this embodiment 2, 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.

[0299] 9 shows an example of a communication state in this embodiment. As shown in FIG. 9, consider a case where base station #1 of 901_1 communicates with 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. However, the relationship between base stations and terminals is not limited to this example, and for example, a base station may communicate with one or more terminals.

[0300] 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 the single carrier system to transmit modulated signals to the base station.

[0301] Figure 10 shows an example of a modulated signal 1000 transmitted by base station #1 901_1 in Figure 9. In Figure 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.

[0302] The time period from time t1 to time t2 is a terminal response period. The terminal response will be explained later.

[0303] In the time period from time t2 to time t3, there is a feedback signal 1002. The feedback signal 1002 will be explained later.

[0304] 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.

[0305] 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.

[0306] Figure 11 shows an example of a sector sweep reference signal 1001 in Figure 10 transmitted by base station #1 901_1 in Figure 9 having the configurations of Figures 1A, 1B, and 1C. In Figure 11, the horizontal axis represents time and the vertical axis represents frequency. In the example of Figure 11, base station #1 901_1 transmits a modulated signal based on OFDMA, and therefore is divided into frequency bands ♭1, ♭2, ..., ♭K, as shown in Figure 11. Note that K is an integer equal to or greater than 1, or an integer equal to or greater than 2.

[0307] For example, in frequency band ♭1, there is a sector sweep reference signal 1101_11 at transmitting panel antenna 1 for frequency ♭1 in the first time interval, a sector sweep reference signal 1101_12 at transmitting panel antenna 2 for frequency ♭1 in the second time interval, ..., a sector sweep reference signal 1101_1M at transmitting panel antenna M for frequency ♭1 in the Mth time interval.

[0308] Therefore, in frequency band ♭i, there is a sector sweep reference signal 1101_i1 at transmitting panel antenna 1 for frequency ♭i in the first time interval, a sector sweep reference signal 1101_i2 at transmitting panel antenna 2 for frequency ♭i in the second time interval, ..., a sector sweep reference signal 1101_iM at transmitting panel antenna M for frequency ♭i in the Mth time interval, where i is an integer between 1 and K.

[0309] Note that sector sweep reference signal 1101_ij in 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.

[0310] One feature of this method is that in FIG. 11, in the i-th time interval, 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.

[0311] 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.

[0312] 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.

[0313] 11 and 12, when base station #1 901_1 transmits "sector sweep reference signal 1101_i in transmitting panel antenna i for frequency ♭p," the "reference signal 1201_j based on the j-th parameter in transmitting panel antenna i for frequency ♭p" includes, for example, the following information: - ID (identification number) of the transmitting panel antenna (equivalent to i here, for example) - Identification number (ID) of the parameter used in beamforming (directivity control) (equivalent to j here, for example) - Number of time divisions in which the terminal can transmit the sector sweep reference signal when transmitting the sector sweep reference signal (this will be explained later).

[0314] 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: - Information about the frequency band and / or frequency ♭p (which may include information about the number of frequency divisions) (Note that this point will be explained later.)

[0315] When base station #1 of 901_1 transmits 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.

[0316] It should be noted that "when a terminal transmits a sector sweep reference signal, the number of time divisions in which the sector sweep reference signal can be transmitted" 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.

[0317] 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.

[0318] 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 second embodiment, an explanation will be given taking as an example a case where the terminal transmits a signal using a single carrier system and the frequencies (bands) used by the base station and the frequencies (bands) used by the terminal partially contain the same frequencies (bands).

[0319] Figure 23 shows an example of operation in the time interval from time t1 to t2, which is the terminal response interval. In Figure 23, the horizontal axis represents time. Terminals such as terminal #1 902_1, terminal #2 902_2, terminal #3 902_3, terminal #4 902_4, terminal #5 902_5, and terminal #6 902_6 in Figure 9 transmit sector sweep reference signals in the time interval from time t1 to t2, which is the terminal response interval. In Figure 23, elements that operate in the same way as in Figures 10 and 13 are assigned the same numbers.

[0320] 10 and 23, 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 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, a fourth transmission interval 1301_4 of a "sector sweep reference signal" for the terminal, a fifth transmission interval 1301_5 of a "sector sweep reference signal" for the terminal, a sixth transmission interval 1301_6 of a "sector sweep reference signal" for the terminal, a seventh transmission interval 1301_7 of a "sector sweep reference signal" for the terminal, and an eighth transmission interval 1301_8 of a "sector sweep reference signal" for the terminal, as shown in FIG.

[0321] Therefore, in the case of Figure 23, base station #1 of 901_1 has set the number of time divisions in which a terminal can transmit a sector sweep reference signal when transmitting a sector sweep reference signal to 8.

[0322] Figure 24 shows an example of terminal occupancy 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, the fourth transmission interval 1301_4 of the "sector sweep reference signal" for the terminal, the fifth transmission interval 1301_5 of the "sector sweep reference signal" for the terminal, the sixth transmission interval 1301_6 of the "sector sweep reference signal" for the terminal, the seventh transmission interval 1301_7 of the "sector sweep reference signal" for the terminal, and the eighth transmission interval 1301_8 of the "sector sweep reference signal" for the terminal shown in Figure 23. Note that in Figure 24, the horizontal axis represents time.

[0323] 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 from 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 "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.

[0324] 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." Furthermore, it is assumed that terminal #1 of 902_1 has estimated that the "frequency domain" with good reception quality is frequency band ♭K.

[0325] 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. 24, 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 8.

[0326] In this case, terminal #1 of 902_1 uses a random number to obtain one of the values, for example, "0," "1," "2," "3," "4," "5," "6," or "7." 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 terminal #1 "sector sweep reference signal" 2401_1 using the "terminal-specific "sector sweep reference signal" first (= "0" + 1) transmission interval 1301_1" in FIG. 24. Note that, although the transmission interval of the sector sweep reference signal is set using a random number here, 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 the terminal, or the like, instead of a random number. Therefore, the setting of the transmission period of the sector sweep reference signal is not limited to the above example, and the transmission period of the sector sweep reference signal may be set for each terminal, for example. This point can also be applied to the following similar explanations.

[0327] It is assumed that the "sector sweep reference signal" 2401_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 parameter b1." The "sector sweep reference signal" 2401_1 of terminal #1 also includes information on the "frequency domain," for example, information on the "frequency band ♭K." This point will be explained later.

[0328] 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 from 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 "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.

[0329] 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." Furthermore, it is assumed that terminal #2 of 902_2 has estimated that the "frequency domain" with good reception quality is frequency band ♭1.

[0330] 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. 24, 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 8.

[0331] In this case, terminal #2 of 902_2 uses a random number to obtain one of the values ​​"0," "1," "2," "3," "4," "5," "6," or "7." For example, terminal #2 of 902_2 obtains "5" using a random number. In this case, since "5" + 1 = 6, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" 2401_2 using the "sixth (= "5" + 1) transmission interval 1301_6 of "terminal "sector sweep reference signal"" in FIG. 24.

[0332] 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." Furthermore, the "sector sweep reference signal" 2401_2 for terminal #2 includes information on the "frequency domain," for example, information on the "frequency band ♭1." This point will be explained later.

[0333] 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 "ID of the parameter used in beamforming (directivity control)" contained therein. Note that, for example, i is an integer equal to or greater than 1. Furthermore, information on the "frequency band and / or frequency ♭p" contained in sector sweep reference signal 1001 may also be used.

[0334] 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 parameter 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.

[0335] 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 sector sweep reference signal can be transmitted when the terminal transmits a sector sweep reference signal." In the case of Fig. 24, terminal #i of 902_i obtains information that "the number of time divisions in which a sector sweep reference signal can be transmitted when the terminal transmits a sector sweep reference signal" is 8.

[0336] In this case, terminal #i of 902_i uses a random number to obtain, for example, one of the values ​​"0," "1," "2," "3," "4," "5," "6," or "7." For example, terminal #i of 902_i uses a random number to obtain "yi." Note that yi takes one of the values ​​"0," "1," "2," "3," "4," "5," "6," or "7." In this case, terminal #i of 902_i transmits terminal #i "sector sweep reference signal" 2401_i using the ("yi"+1)-th transmission interval 1301_("yi"+1) of the "sector sweep reference signal" for terminal #i in FIG. 24 .

[0337] It is assumed that the "sector sweep reference signal" 2401_i for terminal #i includes information on the "transmitting panel antenna and parameters" that have good reception quality obtained by terminal #i of 902_i, i.e., information on the "transmitting panel antenna ai and parameter bi." The "sector sweep reference signal" 2401_i for terminal #i also includes information on the "frequency domain," for example, information on the "frequency band ♭p." This point will be explained later.

[0338] In Fig. 24, the "sector sweep reference signal" 2401_i of terminal #i may use the first frequency (band) as the first method, regardless of i. In this case, the "sector sweep reference signal" 2401_i of terminal #i is time-division multiplexed (TDMA (Time Division Multiple Access)). This is because the terminal transmits a modulated signal using a single carrier method.

[0339] A second method is to have the "sector sweep reference signal" 2401_i of terminal #i not necessarily use the same frequency (band).

[0340] Both the first method and the second method can achieve the effect of "reducing interference from the 'sector sweep reference signal' 2401_i of terminal #i."

[0341] For example, if base station #1 of 901_1 is transmitting a modulated signal using "frequency band ♭1 to frequency band ♭K" as described in embodiment 1, terminal #i of 902_i may transmit a modulated signal using a single carrier method using "frequency band ♭1 to frequency band ♭K".

[0342] As another method, when base station #1 of 901_1 transmits a modulated signal using "frequency band ♭1 to frequency band ♭K" as described in embodiment 1, terminal #i of 902_i can transmit a modulated signal using a single carrier method using part of "frequency band ♭1 to frequency band ♭K".

[0343] Another possible method is for base station #1 of 901_1 to transmit a modulated signal using "frequency band ♭1 to frequency band ♭K" as described in embodiment 1, and for terminal #i of 902_i to transmit a modulated signal using a frequency (band) different from "frequency band ♭1 to frequency band ♭K."

[0344] 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.

[0345] The configuration of terminal #i "sector sweep reference signal" 2401_i transmitted by terminal #i of 902_i explained using FIG. 24 will be described. For simplicity of explanation, terminal #i of 902_i is assumed to have the configurations of FIGS. 1A, 1B, and 1C. Furthermore, terminal #i of 902_i having the configurations of FIGS. 1A, 1B, and 1C is assumed to have the configuration of 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 of FIGS. 1A, 1B, and 1C, and the configuration of transmitting panel antenna xi of terminal #i of 902_i having the configurations of FIGS. 1A, 1B, and 1C is not limited to FIG. 3.

[0346] The difference from the first embodiment is that terminal #i of 902_i transmits a modulated signal of the single carrier system, and the specific configuration has already been explained in the first embodiment.

[0347] Terminal #i of terminals 902_i transmits terminal #i "sector sweep reference signal" 2401_i as shown in FIG. 24. FIG. 15A shows an example of the configuration of terminal #i "sector sweep reference signal" 2401_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" 2401_i in FIG. 24.

[0348] As shown in FIG. 15A, the "sector sweep reference signal" 2401_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."

[0349] For example, terminal #i of 902_i having the configuration of Figures 1A, 1B, and 1C transmits a "sector sweep reference signal 1501_1 in transmission panel antenna 1 of terminal #i" using transmission panel antenna 1 of 106_1.

[0350] 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.

[0351] 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 (where N is an integer equal to or greater than 1).

[0352] Fig. 15B shows an example of the configuration of "sector sweep reference signal 1501_xi at transmission panel antenna xi of terminal #i" in Fig. 15A. Note that in Fig. 15, the horizontal axis represents time.

[0353] As shown in Figure 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."

[0354] 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.

[0355] The "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" will be described.

[0356] 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.

[0357] When terminal #i of group 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902_i sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna xi of group 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 group 902_i transmits tx2ref1(t) × w2(xi,1) from antenna 306_2 of FIG. 3.

[0358] When terminal #i of group 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902_i sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna xi of group 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 group 902_i transmits tx3ref1(t) × w3(xi,1) from antenna 306_3 of FIG. 3.

[0359] When terminal #i of group 902_i transmits "reference signal 1511_1 based on the first parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902_i sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of group 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 group 902_i transmits tx4ref1(t) × w4(xi,1) from antenna 306_4 of FIG. 3.

[0360] The "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" will be described.

[0361] 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 the 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.

[0362] When terminal #i of group 902 transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902 sets the multiplication coefficient of multiplier 304_2 at transmitting panel antenna xi of group 106_xi to w2(xi,j). If second transmission signal 303_2 in "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" is tx2refj(t), multiplier 304_2 obtains tx2refj(t) × w2(xi,j). Then, terminal #i of group 902 transmits tx2refj(t) × w2(xi,j) from antenna 306_2 of FIG. 3.

[0363] When terminal #i of group 902 transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902 sets the multiplication coefficient of multiplier 304_3 at transmitting panel antenna xi of group 106_xi to w3(xi,j). If third transmission signal 303_3 in "reference signal 1511_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 group 902 transmits tx3refj(t) × w3(xi,j) from antenna 306_3 of FIG. 3.

[0364] When terminal #i of group 902 transmits "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" shown in FIG. 15B, terminal #i of group 902 sets the multiplication coefficient of multiplier 304_4 at transmitting panel antenna xi of group 106_xi to w4(xi,j). If the 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 group 902 transmits tx4refj(t) × w4(xi,j) from antenna 306_4 of FIG. 3.

[0365] 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.

[0366] 24, 15A, and 15B, when terminal #i of 902_i transmits "reference signal 1501_xi for sector sweep at transmitting panel antenna xi of terminal #i," the "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" includes, for example, the following information: - Information on the "transmitting panel antenna and parameters" of base station #1 of 901_1, which has good reception quality as described above.

[0367] 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 "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" in Figure 15A.

[0368] 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, which has good reception quality."

[0369] In this case, even if the base station #1 of 901_1 uses an omni-antenna, for example, it is highly likely that it will be able to receive any of the following signals transmitted by the terminal #i of 902_i: "Sector sweep reference signal 1501_1 at terminal #i's transmitting panel antenna 1," "Sector sweep reference signal 1501_2 at terminal #i's transmitting panel antenna 2," ..., "Sector sweep reference signal 1501_M at terminal #i's transmitting panel antenna M" in FIG. 15A. 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, which has good reception quality, and the terminal #i of 902_i can receive the modulated signal with high reception quality.

[0370] In addition, as shown in Figure 24, 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.

[0371] 24, 15A, and 15B, when terminal #i of 902_i transmits "reference signal 1501_xi for sector sweep in transmitting panel antenna xi of terminal #i," "reference signal 1511_j based on the j-th parameter in transmitting panel antenna xi" may include, for example, the following information: - ID (identification number) 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)

[0372] When terminal #i of 902_i transmits the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directional 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 (directional 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.

[0373] 24, 15A, and 15B, when terminal #i of 902_i transmits "sector sweep reference signal 1501_xi at terminal #i's transmitting panel antenna xi," the "reference signal 1511_j based on the j-th parameter at transmitting panel antenna xi" may include, for example, the following information: - "Information on 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.

[0374] 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 reception quality of data.

[0375] 16A shows an example of the configuration of a 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. 16A, the horizontal axis represents time and the vertical axis represents frequency. In this example, 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. Alternatively, the feedback signal 1002 may include Ω transmission intervals. Ω is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0376] In addition, in FIG. 16A, it is assumed that the feedback signal 1002 includes frequency bands ♭1, ♭2, . . . , and ♭K.

[0377] Therefore, the first transmission interval includes a first transmission interval 1601_11 of a feedback signal for frequency ♭1, a first transmission interval 1601_21 of a feedback signal for frequency ♭2, ..., a first transmission interval 1601_K1 of a feedback signal for frequency ♭K. Similarly, the second transmission interval includes a second transmission interval 1601_12 of a feedback signal for frequency ♭1, a second transmission interval 1601_22 of a feedback signal for frequency ♭2, ..., a second transmission interval 1601_K2 of a feedback signal for frequency ♭K. The third transmission interval includes a third transmission interval 1601_13 of a feedback signal for frequency ♭1, a third transmission interval 1601_23 of a feedback signal for frequency ♭2, ..., a third transmission interval 1601_K3 of a feedback signal for frequency ♭K. In the fourth transmission interval, there are a fourth transmission interval 1601_14 for a feedback signal for frequency ♭1, a fourth transmission interval 1601_24 for a feedback signal for frequency ♭2, . . . , a fourth transmission interval 1601_K4 for a feedback signal for frequency ♭K.

[0378] One feature is that "in FIG. 16A, in the i-th time interval, the feedback signal is transmitted from the same transmitting panel antenna regardless of the frequency band."

[0379] FIG. 16B shows an example of a specific feedback signal assignment for the feedback signal 1002 shown in FIG. 16A.

[0380] For example, as shown in FIG. 24, terminal #1 at 902_1 transmits terminal #1 "sector sweep reference signal" 2401_1, terminal #2 at 902_2 transmits terminal #2 "sector sweep reference signal" 2401_2, terminal #3 at 902_3 transmits terminal #3 "sector sweep reference signal" 2401_3, and other terminals also transmit sector sweep reference signals.

[0381] It is assumed that terminal #1's "sector sweep reference signal" 2401_1 includes information that "the reception quality of frequency band ♭K is good." Therefore, base station #1 of 901_1 transmits terminal #1-destined feedback signal 1611_1 using frequency band ♭K, as shown in FIG. 16B.

[0382] It is assumed that the "sector sweep reference signal" 2401_2 for terminal #2 includes information that "the reception quality of frequency band ♭1 is good." Therefore, base station #1 of 901_1 transmits a feedback signal 1611_2 addressed to terminal #2 using frequency band ♭1, as shown in FIG. 16B.

[0383] It is assumed that the "sector sweep reference signal" 2401_3 for terminal #3 includes information that "the reception quality of frequency band ♭1 and frequency band ♭2 is good." Therefore, base station #1 of 901_1 transmits a feedback signal 1611_3 addressed to terminal #3 using frequency bands ♭1 and ♭2, as shown in FIG. 16B.

[0384] It is assumed that the "sector sweep reference signal" (not shown in FIG. 24) for terminal #4 includes information that "the reception quality of frequency band ♭2 is good." Therefore, base station #1 of 901_1 transmits feedback signal 1611_4 addressed to terminal #4 using frequency band ♭2, as shown in FIG. 16B.

[0385] It is assumed that the "sector sweep reference signal" (not shown in FIG. 24) for terminal #5 includes information that "the reception quality of frequency band ♭2 is good." Therefore, base station #1 of 901_1 transmits feedback signal 1611_5 addressed to terminal #5 using frequency band ♭2, as shown in FIG. 16B.

[0386] It is assumed that the "sector sweep reference signal" (not shown in FIG. 24) for terminal #6 includes information that "the reception quality of frequency band ♭K is good." Therefore, base station #1 of 901_1 transmits feedback signal 1611_6 addressed to terminal #6 using frequency band ♭K, as shown in FIG. 16B.

[0387] In this way, by receiving the feedback signal 1611_i addressed to terminal #i, terminal #i of 902_i can know that communication with 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 feedback signal 1611_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.

[0388] 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 Figure 10 includes symbols addressed to terminal #i of 902_i).

[0389] 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.

[0390] 17A shows an example of the configuration of a frame 1003 including a data symbol 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, as shown in FIG. 17A, the frame 1003 including the data symbol includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval. Alternatively, the frame 1003 including the data symbol may include Ω transmission intervals. Ω is an integer equal to or greater than 1 or an integer equal to or greater than 2.

[0391] Also, in FIG. 17A, it is assumed that frame 1003 including data symbols includes frequency band ♭1, frequency band ♭2, . . . , frequency band ♭K.

[0392] 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, ..., 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, ..., 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, ..., 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.

[0393] FIG. 17B shows an example of specific modulation signal (slot) allocation for frame 1003 including the data symbols shown in FIG. 17A.

[0394] As in the example of Figure 24, terminal #1 at 902_1 transmits terminal #1 "sector sweep reference signal" 2401_1, terminal #2 at 902_2 transmits terminal #2 "sector sweep reference signal" 2401_2, terminal #3 at 902_3 transmits terminal #3 "sector sweep reference signal" 2401_3, terminal #4 at 902_4 transmits terminal #4 "sector sweep reference signal" (however, not shown in Figure 24), terminal #5 at 902_5 transmits terminal #5 "sector sweep reference signal" (however, not shown in Figure 24), and terminal #6 at 902_6 transmits terminal #6 "sector sweep reference signal" (however, not shown in Figure 24).

[0395] It is assumed that terminal #1's "sector sweep reference signal" 2401_1 includes information that "the reception quality of frequency band ♭K is good." Therefore, base station #1 of 901_1 transmits modulated signal (slot) 1711 addressed to terminal #1 using frequency band ♭K, as shown in FIG. 17B.

[0396] It is assumed that the "sector sweep reference signal" 2401_2 for terminal #2 includes information that "the reception quality of frequency band ♭1 is good." Therefore, base station #1 of 901_1 transmits modulated signal (slot) 1712 addressed to terminal #2 using frequency band ♭1, as shown in FIG. 17B.

[0397] It is assumed that the "sector sweep reference signal" 2401_3 for terminal #3 includes information that "the reception quality of frequency band ♭1 and frequency band ♭2 is good." Therefore, base station #1 of 901_1 transmits modulated signal (slot) 1713 addressed to terminal #3 using frequency bands ♭1 and ♭2, as shown in FIG. 17B.

[0398] It is assumed that the "sector sweep reference signal" (not shown in FIG. 24) for terminal #4 includes information that "the reception quality of frequency band ♭2 is good." Therefore, base station #1 of 901_1 transmits modulated signal (slot) 1714 addressed to terminal #4 using frequency band ♭2, as shown in FIG. 17B.

[0399] It is assumed that the "sector sweep reference signal" (not shown in FIG. 24) for terminal #5 includes information that "the reception quality of frequency band ♭2 is good." Therefore, base station #1 of 901_1 transmits modulated signal (slot) 1715 addressed to terminal #5 using frequency band ♭2, as shown in FIG. 17B.

[0400] It is assumed that the "sector sweep reference signal" (not shown in FIG. 24) for terminal #6 includes information that "the reception quality of frequency band ♭K is good." Therefore, base station #1 of 901_1 transmits modulated signal (slot) 1716 addressed to terminal #6 using frequency band ♭K, as shown in FIG. 17B.

[0401] 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.

[0402] In this way, terminal #i of 902_i can know that communication with base station #1 of 901_1 is now possible through modulated signal (slot) 171i addressed to terminal #i, and can also know the frequency band to be used. Note that Figure 17B is merely an example, and for example, if modulated signal (slot) 1711 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.

[0403] Based on the "frequency (band) information" and "transmitting panel antenna and parameter information" of base station #1 of 901_1 with good reception quality sent by terminal #i of 902_i, base station #1 of 901_1 selects the frequency (band) and transmitting panel antenna, sets the beamforming parameters, and transmits modulated signal (slot) 171i addressed to terminal #i.

[0404] In addition, in Figures 16A and 16B, base station #1 of 901_1 receives the ``sector sweep reference signal'' 2401_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.

[0405] As a result, terminal #i of 902_i selects a frequency (band) and a transmitting panel antenna based on the 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.

[0406] 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, which includes information such as ACK (acknowledgement), indicating that the signal from base station #1 of 901_1 has been received.

[0407] 17B , in addition to data symbols, the modulated signal (slot) 171i addressed to terminal #i may include, for example, "reference signals such as demodulation reference signal (DMRS), phase tracking reference signal (PTRS), and sounding reference signal (SRS)," pilot symbols, pilot signals, preambles, and symbols containing control information. Possible symbols containing control information include information on the destination terminal (an ID that can identify the terminal), a method for transmitting the modulated signal, information on the modulation scheme, information on the error correction coding scheme (code length, coding rate, etc.), and information on the MCS (Modulation and Coding Scheme).

[0408] 18 shows an example of a situation when 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 from base station #1 of 901_1, and FIG. 18(B) shows an example of a transmission situation of a modulated signal from "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.

[0409] First, base station #1 901_1 transmits a sector sweep reference signal 1801_1. Note that this has already been explained using FIG. 10, so further explanation will be omitted.

[0410] 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 Figures 23, 24, 15A, 15B, etc., so further explanation will be omitted.

[0411] The base station #1 of the terminal 901_1 transmits a feedback signal 1802_1. Note that this point has already been explained using Figs. 16A and 16B, so further explanation will be omitted.

[0412] Thereafter, base station #1 of 901_1 transmits "frame 1803_1 including data symbols." Note that this point has already been explained using Figures 17A and 17B, so further explanation will be omitted. (Therefore, "frame 1803_1 including data symbols" is considered to be, for example, a frame for downlink.)

[0413] 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 FIG. 25. (Therefore, "frame 1852_1 including data symbols" is considered to be, for example, a frame for uplink.)

[0414] Next, base station #1 of 901_1 transmits "frame 1803_2 including data symbols." Note that the method of configuring "frame 1803_2 including data symbols" is as described with reference to FIGS. 17A and 17B.

[0415] 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 explained later with reference to FIG. 25.

[0416] Figure 19 shows an example of the transmission status of modulated signals from base station #1 901_1 in Figure 18 onwards, and the transmission status of modulated signals from terminals such as "terminal #1 902_1, terminal #2 902_2, terminal #3 902_3, terminal #4 902_4, terminal #5 902_5, and terminal #6 902_6".

[0417] FIG. 19A shows an example of a transmission status of a modulated signal from the base station #1 901_1, which is a continuation in time of the transmission status of a modulated signal from the base station #1 901_1 in FIG. 18A.

[0418] 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).

[0419] In addition, in FIGS. 19(A) and 19(B), the horizontal axis represents time.

[0420] 18A and 18B, 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.

[0421] 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 symbols." Note that the configuration of this frame will be explained later with reference to FIG. 25.

[0422] Next, base station #1 of 901_1 transmits a sector sweep reference signal 1801_2. Note that this point has already been explained using FIG. 10, so further explanation will be omitted.

[0423] 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 Figures 23, 24, 15A, 15B, etc., so further explanation will be omitted.

[0424] The base station #1 of the terminal 901_1 transmits a feedback signal 1802_2. Note that this point has already been explained using Figs. 16A and 16B, so further explanation will be omitted.

[0425] Thereafter, base station #1 of 901_1 transmits “frame 1803_4 including data symbol.” Note that this point has already been explained using FIGS. 17A and 17B, so further explanation will be omitted.

[0426] 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." Note that the configuration of this frame will be explained later with reference to FIG. 25.

[0427] 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," a reference signal for sector sweep is transmitted again, and the frequency (band) is set, the transmitting panel antenna to be used is selected, and the transmitting beamforming is set, thereby enabling the base station and / or terminals to obtain high data reception quality.

[0428] 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 Fig. 25. Note that, for example, i is an integer equal to or greater than 1, and in Fig. 25, the horizontal axis represents time.

[0429] As shown in Figure 25, "frame 1852_i including data symbols" is assumed to be composed of a first transmission interval, a second transmission interval, a third transmission interval, a fourth transmission interval, a fifth transmission interval, a sixth transmission interval, a seventh transmission interval, and an eighth transmission interval.

[0430] As shown in FIG. 25, for example, terminal #1 of 902_1 transmits terminal #1 transmission frame 2501_1 (including a data symbol) using the first transmission interval.

[0431] Terminal #2 of terminal 902_2 transmits terminal #2 transmission frame 2501_2 (including a data symbol) using the sixth transmission interval.

[0432] Terminal #3 of terminal 902_3 transmits terminal #3 transmission frame 2501_3 (including a data symbol) using the fourth transmission interval.

[0433] Terminal #4 of 902_4 transmits terminal #4 transmission frame 2501_4 (including a data symbol) using the second transmission interval.

[0434] Terminal #5 of terminal 902_5 transmits terminal #5 transmission frame 2501_5 (including a data symbol) using the eighth transmission interval.

[0435] Terminal #6 of terminal 902_6 transmits terminal #6 transmission frame 2501_6 (including a data symbol) using the fifth transmission interval.

[0436] It is assumed that 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" use a single carrier transmission method. It is also assumed that multiple terminals may use the same frequency (band).

[0437] 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, 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.

[0438] In addition, in terminal #1 transmission frame 2501_1, terminal #2 transmission frame 2501_2, terminal #3 transmission frame 2501_3, terminal #4 transmission frame 2501_4, terminal #5 transmission frame 2501_5, and terminal #6 transmission frame 2501_6 in Figure 25, 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.

[0439] Although Figure 25 describes a case where a frame transmitted by a terminal is time-divided, the frame transmitted by a terminal may also be spatially divided using MU-MIMO (Multi User-MIMO (Multiple-Input Multiple-Output)).

[0440] 24 shows an example of terminal occupation of 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, the fourth transmission interval 1301_4 of the "sector sweep reference signal" for the terminal, the fifth transmission interval 1301_5 of the "sector sweep reference signal" for the terminal, the sixth transmission interval 1301_6 of the "sector sweep reference signal" for the terminal, the seventh transmission interval 1301_7 of the "sector sweep reference signal" for the terminal, and the eighth transmission interval 1301_8 of the "sector sweep reference signal" for the terminal" shown in FIG. 23.

[0441] 26 illustrates an example of terminal occupation of 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, the fourth transmission interval 1301_4 of the "sector sweep reference signal" for the terminal, the fifth transmission interval 1301_5 of the "sector sweep reference signal" for the terminal, the sixth transmission interval 1301_6 of the "sector sweep reference signal" for the terminal, the seventh transmission interval 1301_7 of the "sector sweep reference signal" for the terminal, and the eighth transmission interval 1301_8 of the "sector sweep reference signal" for the terminal" shown in FIG. 23, which is different from FIG. 24.

[0442] In Fig. 26, the same numbers are used for components that operate in the same way as in Fig. 23 and Fig. 24, and since they have already been explained, their explanation will be omitted. Below, the points that differ from the explanation in Fig. 24 will be explained.

[0443] Terminal #2 at 902_2 in Figure 9 receives sector sweep reference signal 1001 transmitted by base station #1 at 901_1, and obtains a "frequency (band)" with good reception quality, an "ID (identification) of the transmitting panel antenna," and an "identification number (ID) of the parameter used in beamforming (directivity control)," thereby being able to communicate with base station #1 at 901_1.

[0444] Terminal #2 of 902_2 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a2 and parameters b2."

[0445] 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. 26, 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 8.

[0446] In this case, terminal #2 of 902_2 uses a random number to obtain one of the values, for example, "0," "1," "2," "3," "4," "5," "6," or "7." For example, terminal #2 of 902_2 obtains "5" using a random number. In this case, since "5" + 1 = 6, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" 2401_2 using "terminal "sector sweep reference signal" sixth transmission interval 1301_6" as shown in FIG. 26 .

[0447] It is assumed that the "sector sweep reference signal" 2401_2 of 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."

[0448] Terminal #3 at 902_3 in Figure 9 receives sector sweep reference signal 1001 transmitted by base station #1 at 901_1, and obtains the "ID (identification) of the transmitting panel antenna" and the "ID of the parameter used in beamforming (directivity control)" with good reception quality, thereby enabling communication with base station #1 at 901_1.

[0449] Terminal #3 of 902_3 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" with good reception quality are, for example, "transmitting panel antenna a3 and parameters b3."

[0450] Furthermore, terminal #3 of 902_3 estimates the "frequency (band)" and "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. 26, terminal #3 of 902_3 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 8.

[0451] In this case, terminal #3 of 902_3 uses a random number to obtain one of the values, for example, "0," "1," "2," "3," "4," "5," "6," or "7." For example, terminal #3 of 902_3 obtains "5" using a random number. In this case, since "5" + 1 = 6, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" 2601_3 using "terminal "sector sweep reference signal" sixth transmission interval 1301_6" as shown in FIG. 26 .

[0452] It is assumed that the "sector sweep reference signal" 2601_3 of terminal #3 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, i.e., information on the "transmitting panel antenna a3 and parameters b3."

[0453] At this time, as shown in FIG. 26, the time intervals of "terminal #2 "sector sweep reference signal" 2401_2 transmitted by terminal #2 of 902_2" and "terminal #3 "sector sweep reference signal" 2601_3 transmitted by terminal #3 of 902_3" overlap.

[0454] Therefore, there is a possibility that base station #1 of 901_1 may simultaneously receive the "sector sweep reference signal" 2401_2 of terminal #2 and the "sector sweep reference signal" 2601_3 of terminal #3.

[0455] In this case, the following two cases are possible.

[0456] <Case 1> Both the "terminal #2 "sector sweep reference signal" 2401_2 transmitted by terminal #2 of 902_2" and the "terminal #3 "sector sweep reference signal" 2601_3 transmitted by terminal #3 of 902_3" have the configurations shown in Figures 15A and 15B.

[0457] At this time, when base station #1 of 901_1 receives "terminal #2 "sector sweep reference signal" 2401_2 transmitted by terminal #2 of 902_2," the "transmission panel antenna and beamforming parameters of terminal #2 of 902_2" with good reception quality is different from "terminal #3 "sector sweep reference signal" 2601_3 transmitted by terminal #3 of 902_3" with good reception quality when base station #1 of 901_1 receives "terminal #3 "sector sweep reference signal" 2601_3 transmitted by terminal #3 of 902_3." Therefore, it is assumed that base station #1 of 901_1 has obtained the information included in "terminal #2 "sector sweep reference signal" 2401_2 transmitted by terminal #2 of 902_2" and the information included in "terminal #3 "sector sweep reference signal" 2601_3 transmitted by terminal #3 of 902_3."

[0458] In this case, for example, in FIG. 16A, the second transmission section 1601_12 of the feedback signal for frequency ♭1 is a signal addressed to terminal #2 of 902_2, and the third transmission section 1601_13 of the feedback signal for frequency ♭1 is a signal addressed to terminal #3 of 902_3.

[0459] Also, for example, in Figure 17A, "the second transmission section 1701_12 of the modulated signal (slot) for frequency ♭1 is a signal addressed to terminal #2 of 902_2" and "the third transmission section 1701_13 of the modulated signal (slot) for frequency ♭1 is a signal addressed to terminal #3 of 902_3."

[0460] In this way, the base station #1 of 901_1 can communicate with the terminal #2 of 902_2 and the terminal #3 of 902_3.

[0461] <Case 2> Both the "terminal #2 "sector sweep reference signal" 2401_2 transmitted by terminal #2 of 902_2" and the "terminal #3 "sector sweep reference signal" 2601_3 transmitted by terminal #3 of 902_3" have the configurations shown in Figures 15A and 15B.

[0462] At this time, when base station #1 of 901_1 receives terminal #2's "sector sweep reference signal" 2401_2 transmitted by terminal #2 of 902_2, the "transmitting panel antenna and beamforming parameters of terminal #2 of 902_2" with good reception quality, and when base station #1 of 901_1 receives terminal #3's "sector sweep reference signal" 2601_3 transmitted by terminal #3 of 902_3, the "transmitting panel antenna and beamforming parameters of terminal #3 of 902_3" with good reception quality are assumed to interfere with each other.

[0463] <Case 2-1> There is a case where base station #1 of 901_1 obtains either the information contained in "Terminal #2 'Sector Sweep Reference Signal' 2401_2 transmitted by Terminal #2 of 902_2" or the information contained in "Terminal #3 'Sector Sweep Reference Signal' 2601_3 transmitted by Terminal #3 of 902_3."

[0464] For example, it is assumed that the base station #1 of 901_1 has obtained information contained in the "terminal #2 'sector sweep reference signal' 2401_2 transmitted by terminal #2 of 902_2."

[0465] In this case, for example, in FIG. 16A, the second transmission section 1601_13 of the feedback signal for frequency ♭1 is set as a signal addressed to terminal #2 of 902_2.

[0466] Also, for example, in FIG. 17A, the second transmission interval 1701_13 of the modulated signal (slot) for frequency ♭1 is set as a signal addressed to terminal #2 of 902_2.

[0467] In this way, the base station #1 of 901_1 can communicate with (terminal #1 of 902_1) and terminal #2 of 902_2.

[0468] The operation of terminal #3 of 902_3 will be described.

[0469] Assume that the sector sweep reference signal 1851_1 in Fig. 18 is in the state shown in Fig. 26. Therefore, frames 1803_1, 1803_2, and 1803_3 including data symbols in Fig. 18 do not include a frame (slot) addressed to terminal #3 of 902_3.

[0470] In this case, terminal #3 at 902_3 in Figure 9 receives sector sweep reference signal 1801_2 in Figure 19 transmitted by base station #1 at 901_1, and obtains a "frequency (band)" with good reception quality, an "ID (identification) of the transmitting panel antenna," and an "identification number (ID) of the parameter used in beamforming (directivity control)," thereby being able to communicate with base station #1 at 901_1.

[0471] Terminal #3 of 902_3 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a3 and parameters b3."

[0472] Furthermore, while making these estimates, terminal #3 of 902_3 also 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." Terminal #3 of 902_3 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 8.

[0473] In this case, terminal #3 of 902_3 uses a random number to obtain one of the values ​​"0," "1," "2," "3," "4," "5," "6," or "7." For example, terminal #3 of 902_3 generates a random number using a seed different from the previous time and obtains "3." In this case, since "3" + 1 = 4, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" 2401_3 using "terminal "sector sweep reference signal" fourth transmission interval 1301_4" as shown in FIG. 24.

[0474] It is assumed that the "sector sweep reference signal" 2401_3 of terminal #3 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, i.e., information on the "transmitting panel antenna a3 and parameters b3."

[0475] At this time, as shown in FIG. 24, base station #1 of 901_1 receives "terminal #3 "sector sweep reference signal" 2401_3 transmitted by terminal #3 of 902_3," and thereafter performs the aforementioned predetermined procedure, and base station #1 of 901_1 and terminal #3 of 902_3 communicate with each other.

[0476] <Case 2-2> There may be cases where base station #1 of 901_1 is unable to obtain both the information contained in "Terminal #2 'Sector Sweep Reference Signal' 2401_2 transmitted by Terminal #2 of 902_2" and the information contained in "Terminal #3 'Sector Sweep Reference Signal' 2601_3 transmitted by Terminal #3 of 902_3."

[0477] 18, assume that the state shown in FIG. 26 is reached, and base station #1 of 901_1 is unable to obtain both the information contained in "terminal #2 'sector sweep reference signal' 2401_2 transmitted by terminal #2 of 902_2" and the information contained in "terminal #3 'sector sweep reference signal' 2601_3 transmitted by terminal #3 of 902_3." In this case, frames 1803_1, 1803_2, and 1803_3 containing data symbols in FIG. 18 do not include a frame (slot) addressed to terminal #2 of 902_2 or a frame (slot) addressed to terminal #3 of 902_3.

[0478] In this case, terminal #2 at 902_2 in Figure 9 receives sector sweep reference signal 1801_2 in Figure 19 transmitted by base station #1 at 901_1, and obtains the "frequency (band)," "ID (identification) of the transmitting panel antenna," and "ID of the parameter used in beamforming (directivity control)" with good reception quality, thereby being able to communicate with base station #1 at 901_1.

[0479] Terminal #2 of 902_2 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a2 and parameters b2."

[0480] Furthermore, while making these estimates, terminal #2 of 902_2 also 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." 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 8.

[0481] In this case, terminal #2 of 902_2 uses a random number to obtain one of the values ​​"0," "1," "2," "3," "4," "5," "6," or "7." For example, terminal #2 of 902_2 generates a random number using a seed different from the previous time and obtains "5." In this case, since "5" + 1 = 6, terminal #2 of 902_2 transmits terminal #2 "sector sweep reference signal" 2401_2 using "terminal "sector sweep reference signal" sixth transmission interval 1301_6," as shown in FIG. 24 .

[0482] It is assumed that the "sector sweep reference signal" 2401_2 of 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 b3."

[0483] At this time, as shown in FIG. 24, base station #1 of 901_1 receives "terminal #2 "sector sweep reference signal" 2401_2 transmitted by terminal #2 of 902_2," and thereafter performs the aforementioned predetermined procedure, and base station #1 of 901_1 and terminal #2 of 902_2 communicate with each other.

[0484] Similarly, terminal #3 at 902_3 in Figure 9 receives sector sweep reference signal 1801_2 in Figure 19 transmitted by base station #1 at 901_1, and obtains a "frequency (band)" with good reception quality, an "ID (identification) of the transmitting panel antenna," and an "identification number (ID) of the parameter used in beamforming (directivity control)," thereby being able to communicate with base station #1 at 901_1.

[0485] Terminal #3 of 902_3 estimates that the "frequency (band)" with good reception quality is frequency band ♭1, and that the "transmitting panel antenna and parameters" are, for example, "transmitting panel antenna a3 and parameters b3."

[0486] Furthermore, while making these estimates, terminal #3 of 902_3 also 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." Terminal #3 of 902_3 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 8.

[0487] In this case, terminal #3 of 902_3 uses a random number to obtain one of the values ​​"0," "1," "2," "3," "4," "5," "6," or "7." For example, terminal #3 of 902_3 generates a random number using a different seed than the previous time and obtains "3." In this case, since "3" + 1 = 4, terminal #3 of 902_3 transmits terminal #3 "sector sweep reference signal" 2401_3 using "terminal "sector sweep reference signal" fourth transmission interval 1301_4" as shown in FIG. 24.

[0488] It is assumed that the "sector sweep reference signal" 2401_3 of terminal #3 includes information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, i.e., information on the "transmitting panel antenna a3 and parameters b3."

[0489] At this time, as shown in FIG. 24, base station #1 of 901_1 receives "terminal #3 "sector sweep reference signal" 2401_3 transmitted by terminal #3 of 902_3," and thereafter performs the aforementioned predetermined procedure, and base station #1 of 901_1 and terminal #3 of 902_3 communicate with each other.

[0490] By doing the above, it is possible to further 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.

[0491] As described in the second embodiment, a terminal can transmit a sector sweep reference signal to reduce the number of collisions, thereby improving the communication capacity of a system consisting of a base station and terminals. The configurations of the terminal and base station are not limited to those shown in Figures 1A, 1B, and 1C. The configurations of the transmitting panel antenna and the receiving panel antenna are not limited to those shown in Figures 3 and 4, but may be any antenna configuration capable of generating one or more or multiple transmitting and receiving directivities. Although signals, frames, etc. are shown in Figures 10, 11, 12, 23, 24, 15A, 15B, 16A, 16B, 17A, 17B, 18, 19, 24, 25, and 26, the names of signals, frames, etc. are not limited to these, and the function of the transmitted signal itself is important.

[0492] (Embodiment 3) In this embodiment 3, as a modification of embodiment 1, an example will be described in which a base station transmits multiple modulated signals (multiple streams) to a terminal. (That is, an example will be described in which MIMO (Multiple-Input Multiple-Output) is implemented.) Note that in the following description of embodiment 3, the figures shown in embodiments 1 and 2 may be referenced.

[0493] 9 shows an example of a communication state in this embodiment. Details have already been explained, so further explanation will be omitted.

[0494] Fig. 27 shows an example of a modulated signal 2700 transmitted by base station #1 901_1 in Fig. 9. Note that the same numbers are used for components that operate in the same way as in Fig. 10, and their explanation will be omitted.

[0495] A sector sweep reference signal 1001 exists in the time interval from time t0 to t1.

[0496] The time period from time t1 to time t2 is the response period of the terminal.

[0497] In the time period from time t2 to time t3, there is a feedback signal group 2702. The feedback signal group 2702 will be explained later.

[0498] In the time interval from time t4 to time t5, there is a frame group 2703 including data symbols. Note that the frame group 2703 including data symbols will be explained later.

[0499] As explained in other embodiments, the configuration of base station #1 901_1 in Fig. 9 is assumed to be the configuration shown in Fig. 1A, 1B, or 1C. Also, base station #1 901_1 having the configurations shown in Fig. 1A, 1B, or 1C is assumed to have the configuration shown in Fig. 3 as the transmitting panel antenna xi of 106_xi. However, base station #1 901_1 is not limited to the configurations shown in Fig. 1A, 1B, or 1C, and the configuration of transmitting panel antenna xi of 106_xi of base station #1 901_1 having the configurations shown in Fig. 1A, 1B, or 1C is not limited to that shown in Fig. 3.

[0500] Fig. 11 shows an example of sector sweep reference signal 1001 in Fig. 23 transmitted by base station #1 in Fig. 9. Note that the operation in Fig. 11 has already been explained, so explanation will be omitted.

[0501] Fig. 12 shows an example of the configuration of the "sector sweep reference signal 1101_i in the transmitting panel antenna i" in Fig. 11. Note that the operation of Fig. 12 has already been explained, so explanation will be omitted.

[0502] 13 shows an example of operation during the time interval from time t1 to t2, which is the terminal response interval. Note that the operation of FIG. 13 has already been explained, so its explanation will be omitted.

[0503] Figure 14 shows an example of terminal occupation of 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 Figure 13. Note that the operation of Figure 14 has already been explained, so only the parts of the operation that differ in this embodiment will be explained.

[0504] For example, assume that terminal #1 902_1 in Fig. 9 wishes to receive multiple modulated signals from base station #1 901_1. Here, assume that terminal #1 902_1 in Fig. 9 wishes to receive two modulated signals from base station #1 901_1. In this case, terminal #1 902_1 in Fig. 9 receives sector sweep reference signal 1001 transmitted by base station #1 901_1, and estimates the two "transmitting panel antennas and parameter numbers" with the best reception quality from the transmitting panel antennas of base station #1 901_1.

[0505] In this case, the two "transmitting panel antennas and parameter numbers" with better reception quality are named the first "transmitting panel antenna and parameter number" and the second "transmitting panel antenna and parameter number." The "transmitting panel antenna with the first "transmitting panel antenna and parameter number"" and the "transmitting panel antenna with the second "transmitting panel antenna and parameter number"" are assumed to be different.

[0506] At this time, terminal #1 of 902_1 in Fig. 9 will select a first frequency (band) in combination with the first "transmitting panel antenna and parameter number." Also, terminal #1 of 902_1 in Fig. 9 will select a second frequency (band) in combination with the second "transmitting panel antenna and parameter number." Note that the first frequency (band) and the second frequency (band) may be the same or different, or may have some common frequencies.

[0507] 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. Specifically, the above is performed by base station #1 901_1 transmitting the sector sweep reference signal of Fig. 11 and terminal #1 902_1 receiving the sector sweep reference signal of Fig. 11.

[0508] Assume that terminal #1 of 902_1 has estimated that the two "transmitting panel antennas and parameters" with good reception quality are, for example, "transmitting panel antenna a1_1 and parameter b1_1" and "transmitting panel antenna a1_2 and parameter b1_2." (Note that hereinafter, when describing using FIGS. 28A, 28B, 29A, 29B, etc., the "transmitting panel antenna a1_1" will be referred to as the transmitting panel antenna 1 of 106_1 (of base station #1 of 901_1) in FIGS. 1A, 1B, and 1C, and the "transmitting panel antenna a1_2" will be referred to as the transmitting panel antenna 2 of 106_2 (of base station #1 of 901_1) in FIGS. 1A, 1B, and 1C.) (Furthermore, a frequency (band) is also estimated in conjunction with the "transmitting panel antenna a1_1 and parameter b1_1." Similarly, a frequency (band) is also estimated in conjunction with the "transmitting panel antenna a1_2 and parameter b1_2.")

[0509] 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. 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.

[0510] In this case, terminal #1 of 902_1 uses a random number to obtain one of the values ​​"0," "1," "2," or "3." For example, suppose 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 "terminal "sector sweep reference signal" first (= "0" + 1) transmission interval 1301_1" in FIG. 14 (see FIG. 14) (terminal #1 "sector sweep reference signal" 1401_1 is assumed to exist in frequency band ♭K.)

[0511] 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_1 and parameter b1_1" and information on the "transmitting panel antenna a1_2 and parameter b1_2." The sector sweep reference signal 1401_1 may also include request information (here, "2") on the "number of modulated signals (streams) that terminal #1 of 902_1 requests base station #1 of 901_1 to transmit." Furthermore, the "sector sweep reference signal" 1401_1 of terminal #1 includes frequency (band) information (here, frequency band ♭K) corresponding to the information on the "transmitting panel antenna a1_1 and parameter b1_1" and frequency (band) information (here, frequency band ♭K) corresponding to the information on the "transmitting panel antenna a1_2 and parameter b1_2."

[0512] The information and transmission status included in the sector sweep reference signal transmitted by the other terminals have been described in another embodiment using FIG. 14, and therefore will not be described here. The sector sweep reference signal transmitted by the other terminals may include request information for "the number of modulated signals (streams) that base station #1 of 901_1 is requested to transmit." For example, when the "number of modulated signals (streams) that base station #1 of 901_1 is requested to transmit" is "1," this information will be included. (The "number of modulated signals (streams) that base station #1 of 901_1 is requested to transmit" is set to a number equal to or greater than "1.")

[0513] By doing so, it is possible to reduce collisions of 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. Also, by doing so, it becomes possible for the base station to transmit one or more modulated signals (streams) to each terminal.

[0514] The configuration of terminal #i "sector sweep reference signal" 1401_i transmitted by terminal #i of 902_i, which was explained using FIG. 14, will be described. For simplicity of explanation, terminal #i of 902_i is assumed to have the configurations of FIGS. 1A, 1B, and 1C. Furthermore, terminal #i of 902_i having the configurations of FIGS. 1A, 1B, and 1C is assumed to have the configuration of 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 of FIGS. 1A, 1B, and 1C, and the configuration of transmitting panel antenna xi of 106_xi of terminal #i of 902_i having the configurations of FIGS. 1A, 1B, and 1C is not limited to FIG. 3.

[0515] For example, terminal #i of 902_i having the configurations of Figures 1A, 1B, and 1C transmits terminal #i "sector sweep reference signal" 1401_i as shown in Figure 14. The configuration and included information of terminal #i "sector sweep reference signal" 1401_i have been explained in other embodiments using Figures 15A and 15B, so explanation will be omitted here.

[0516] Several cases will be explained below.

[0517] <Case 1> Figures 28A and 28B show an example of the configuration of a feedback signal group 2702 transmitted by base station #1 901_1, which exists in the time interval from t2 to t3 in Figure 27. Note that in Figures 28A and 28B, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, base station #1 901_1 is assumed to have four transmitting panel antennas: transmitting panel antenna 1 106_1, transmitting panel antenna 2 106_2, transmitting panel antenna 3 106_3, and transmitting panel antenna 4 106_4. In Figures 28A and 28B, similar to Figure 16A, the feedback signal group 2702 includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0518] 28A and 28B deal only with a feedback signal addressed to terminal #1 of 902_1. However, although not shown in FIGS. 28A and 28B, there may be feedback signals addressed to terminals other than terminal #1 of 902_1.

[0519] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in the feedback signal group 2702, as shown in FIG. 28A, feedback signal (1) 2811_11 addressed to terminal #1 exists in frequency band ♭K of the first transmission interval, and as shown in FIG. 28B, feedback signal (2) 2811_12 addressed to terminal #1 exists in frequency band ♭K of the first transmission interval.

[0520] Note that the explanation uses the term feedback signal group because, in the same frequency band and the same transmission period, there can be a feedback signal transmitted from transmitting panel antenna 1 106_1, a feedback signal transmitted from transmitting panel antenna 2 106_2, a feedback signal transmitted from transmitting panel antenna 3 106_3, and a feedback signal transmitted from transmitting panel antenna 4 106_4.

[0521] For example, as shown in Fig. 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) of 2811_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission interval as shown in Fig. 28A, and "feedback signal (2) of 2811_12 addressed to terminal #1" which exists in frequency band ♭K of the first transmission interval as shown in Fig. 28B. At this time, "feedback signal (1) of 2811_11 addressed to terminal #1" is transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1, and "feedback signal (2) of 2811_12 addressed to terminal #1" is transmitted from transmitting panel antenna 2 of 106_2 of base station #1 of 901_1.

[0522] In this way, the reason why there are "feedback signal (1) for terminal #1 at 2811_11" and "feedback signal (2) for terminal #1 at 2811_12" is that "base station #1 at 901_1 transmits two modulated signals (streams) to terminal #1 at 902_1."

[0523] At this time, the "feedback signal (1) addressed to terminal #1 of 2811_11" includes, for example, information that terminal #1 of 902_1 and (base station #1 of 901_1) are capable of communicating using transmitting panel antenna 1 of 106_1.

[0524] In addition, the "feedback signal (2) addressed to terminal #1 of 2811_12" includes, for example, information that terminal #1 of 902_1 and (base station #1 of 901_1) can communicate using transmitting panel antenna 2 of 106_2.

[0525] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with good reception quality, and frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects the transmitting panel antenna and sets the beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) addressed to terminal #1 of 2811_11" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 28A, and "feedback signal (2) addressed to terminal #1 of 2811_12" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 28B.

[0526] 28A and 28B, there may be a feedback signal addressed to a terminal other than terminal #1 of 902_1 (see, for example, FIG. 16B).

[0527] In the above example, as shown in Figures 28A and 28B, base station #1 of 901_1 transmits a "feedback signal (1) of 2811_11 addressed to terminal #1" and a "feedback signal (2) of 2811_12 addressed to terminal #1" to terminal #1 of 902_1, but base station #1 of 901_1 may transmit three or more feedback signals to terminal #1 of 902_1.

[0528] Figures 29A and 29B show an example of the configuration of a frame group 2703 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 27. Note that in Figures 29A and 29B, the horizontal axis represents time and the vertical axis represents frequency. In Figures 29A and 29B, similar to Figure 17A, the frame group 2703 including data symbols includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0529] 29A and 29B deal with a modulated signal (slot) addressed to terminal #1 of 902_1. However, although not shown in FIGS. 29A and 29B, a modulated signal (slot) addressed to a terminal other than terminal #1 of 902_1 may also exist.

[0530] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in frame group 2703 including data symbols, as shown in FIG. 29A, modulated signal (slot) (1) addressed to terminal #1 of 2911_11 exists in frequency band ♭K of the first transmission period, and as shown in FIG. 29B, modulated signal (slot) (2) addressed to terminal #1 of 2911_12 exists in frequency band ♭K of the first transmission period.

[0531] It is noted that the term "frame group containing data symbols" is used because, in the same frequency band and same transmission period, there can be a "frame containing data symbols" transmitted from transmitting panel antenna 1 106_1, a "frame containing data symbols" transmitted from transmitting panel antenna 2 106_2, a "frame containing data symbols" transmitted from transmitting panel antenna 3 106_3, and a "frame containing data symbols" transmitted from transmitting panel antenna 4 106_4.

[0532] For example, as shown in Fig. 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits "modulated signal (slot) (1) of 2911_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission interval as shown in Fig. 29A, and "modulated signal (slot) (2) of 2911_12 addressed to terminal #1" which exists in frequency band ♭K of the first transmission interval as shown in Fig. 29B, to terminal #1 of 902_1. At this time, "modulated signal (slot) (1) of 2911_11 addressed to terminal #1" is transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1, and "modulated signal (slot) (2) of 2911_12 addressed to terminal #1" is transmitted from transmitting panel antenna 2 of 106_2 of base station #1 of 901_1.

[0533] In this way, the reason why there are "modulated signal (slot) (1) addressed to terminal #1 at 2911_11" and "modulated signal (slot) (2) addressed to terminal #1 at 2911_12" is because "base station #1 at 901_1 transmits two modulated signals (streams) to terminal #1 at 902_1."

[0534] At this time, it is assumed that the "modulated signal (slot) (1) of 2911_11 addressed to terminal #1" contains, for example, a data symbol (data, information) of 902_1 addressed to terminal #1.

[0535] In addition, it is assumed that the "modulated signal (slot) (2) of 2911_12 addressed to terminal #1" also includes, for example, a data symbol (data, information) of 902_1 addressed to terminal #1.

[0536] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with the best reception quality" and "frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna and sets beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 2911_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 29A, and "modulated signal (slot) (2) of 2911_12 addressed to terminal #1" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 29B.

[0537] 29A and 29B, there may be modulated signals (slots) addressed to terminals other than terminal #1 of 902_1 (see, for example, FIG. 17B).

[0538] In the above example, as shown in Figures 29A and 29B, base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 2911_11 addressed to terminal #1" and "modulated signal (slot) (2) of 2911_12 addressed to terminal #1," but base station #1 of 901_1 may transmit three or more modulated signals (slots) (multiple modulated signals (slots) using the same frequency resource) to terminal #1 of 902_1.

[0539] In addition, in the "modulated signal (slot) (1) of 2911_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 2911_12 addressed to terminal #1", in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS", pilot symbols, pilot signals, preambles, symbols including control information, etc. In addition, symbols including control information may include information on the destination terminal (ID that can identify the terminal), information on the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0540] <Case 2> Figures 30A and 30B show an example of the configuration of a feedback signal group 2702 transmitted by base station #1 901_1, which exists in the time interval from t2 to t3 in Figure 27. Note that in Figures 30A and 30B, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, base station #1 901_1 is assumed to have four transmitting panel antennas: transmitting panel antenna 1 106_1, transmitting panel antenna 2 106_2, transmitting panel antenna 3 106_3, and transmitting panel antenna 4 106_4. In Figures 30A and 30B, similar to Figure 16A, the feedback signal group 2702 is assumed to have a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and to have frequency bands ♭1, ♭2, ..., and ♭K.

[0541] 30A and 30B deal only with a feedback signal addressed to terminal #1 of 902_1. However, although not shown in FIGS. 30A and 30B, there may be feedback signals addressed to terminals other than terminal #1 of 902_1.

[0542] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in the feedback signal group 2702, as shown in FIG. 30A, feedback signal (1) 3011_11 addressed to terminal #1 exists in frequency band ♭K of the first transmission period, and as shown in FIG. 30B, feedback signal (2) 3011_12 addressed to terminal #1 exists in frequency band ♭2 of the first transmission period.

[0543] For example, as shown in Fig. 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) of 3011_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission interval as shown in Fig. 30A, and "feedback signal (2) of 3011_12 addressed to terminal #1" which exists in frequency band ♭2 of the first transmission interval as shown in Fig. 30B. At this time, "feedback signal (1) of 3011_11 addressed to terminal #1" is transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1, and "feedback signal (2) of 3011_12 addressed to terminal #1" is transmitted from transmitting panel antenna 2 of 106_2 of base station #1 of 901_1.

[0544] In this way, the reason why there exists "feedback signal (1) for terminal #1 at 3011_11" and "feedback signal (2) for terminal #1 at 3011_12" is that "base station #1 at 901_1 transmits two modulated signals (streams) to terminal #1 at 902_1."

[0545] At this time, the "feedback signal (1) addressed to terminal #1 of 3011_11" includes, for example, information that terminal #1 of 902_1 and (base station #1 of 901_1) are capable of communicating using transmitting panel antenna 1 of 106_1.

[0546] In addition, the "feedback signal (2) addressed to terminal #1 of 3011_12" includes, for example, information that terminal #1 of 902_1 and (base station #1 of 901_1) can communicate using transmitting panel antenna 2 of 106_2.

[0547] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with good reception quality, and frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects the transmitting panel antenna and sets the beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) addressed to terminal #1 of 3011_11" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 30A, and "feedback signal (2) addressed to terminal #1 of 3011_12" which exists in frequency band ♭2 of the first transmission section, as shown in FIG. 30B.

[0548] 30A and 30B, there may be a feedback signal addressed to a terminal other than terminal #1 of 902_1 (see, for example, FIG. 16B).

[0549] In the above example, as shown in Figures 30A and 30B, base station #1 of 901_1 transmits a "feedback signal (1) for terminal #1 of 3011_11" and a "feedback signal (2) for terminal #1 of 3011_12" to terminal #1 of 902_1, but base station #1 of 901_1 may transmit three or more feedback signals to terminal #1 of 902_1.

[0550] Figures 31A and 31B show an example of the configuration of a frame group 2703 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 27. Note that in Figures 31A and 31B, the horizontal axis represents time and the vertical axis represents frequency. In Figures 31A and 31B, similar to Figure 17A, the frame group 2703 including data symbols includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0551] 31A and 31B deal with a modulated signal (slot) addressed to terminal #1 of 902_1. However, although not shown in FIGS. 31A and 31B, a modulated signal (slot) addressed to a terminal other than terminal #1 of 902_1 may also exist.

[0552] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in frame group 2703 containing data symbols, as shown in Figure 31A, modulated signal (slot) (1) addressed to terminal #1 of 3111_11 exists in frequency band ♭K of the first transmission period, and as shown in Figure 31B, modulated signal (slot) (2) addressed to terminal #1 of 3111_12 exists in frequency band ♭2 of the first transmission period.

[0553] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits "modulated signal (slot) (1) of 3111_11 addressed to terminal #1" in frequency band ♭K of the first transmission interval as shown in Figure 31A, and "modulated signal (slot) (2) of 3111_12 addressed to terminal #1" in frequency band ♭2 of the first transmission interval as shown in Figure 31B, to terminal #1 of 902_1. At this time, "modulated signal (slot) (1) of 3111_11 addressed to terminal #1" is transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1, and "modulated signal (slot) (2) of 3111_12 addressed to terminal #1" is transmitted from transmitting panel antenna 2 of 106_2 of base station #1 of 901_1.

[0554] In this way, the reason why there are "modulated signal (slot) (1) of 3111_11 addressed to terminal #1" and "modulated signal (slot) (2) of 3111_12 addressed to terminal #1" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1."

[0555] At this time, it is assumed that the "modulated signal (slot) (1) of 3111_11 addressed to terminal #1" contains, for example, a data symbol (data, information) addressed to terminal #1 of 902_1.

[0556] In addition, it is assumed that the "modulated signal (slot) (2) of 3111_12 addressed to terminal #1" also includes, for example, a data symbol (data, information) of 902_1 addressed to terminal #1.

[0557] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with the best reception quality" and "frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna and sets beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3111_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 31A, and "modulated signal (slot) (2) of 3111_12 addressed to terminal #1" which exists in frequency band ♭2 of the first transmission section, as shown in FIG. 31B.

[0558] 31A and 31B, there may be modulated signals (slots) addressed to terminals other than terminal #1 of 902_1 (see, for example, FIG. 17B).

[0559] In the above example, as shown in Figures 31A and 31B, base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3111_11 addressed to terminal #1" and "modulated signal (slot) (2) of 3111_12 addressed to terminal #1," but base station #1 of 901_1 may transmit three or more modulated signals (slots) (modulated signals (slots) using multiple frequency resources) to terminal #1 of 902_1.

[0560] In addition, in the "modulated signal (slot) (1) of 3111_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 3111_12 addressed to terminal #1", in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS", pilot symbols, pilot signals, preambles, symbols including control information, etc. In addition, symbols including control information may include information on the destination terminal (ID that can identify the terminal), information on the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0561] <Case 3> Figures 32A and 32B show an example of the configuration of a feedback signal group 2702 transmitted by base station #1 901_1, which exists in the time interval from t2 to t3 in Figure 27. Note that in Figures 32A and 32B, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, base station #1 901_1 is assumed to have four transmitting panel antennas: transmitting panel antenna 1 106_1, transmitting panel antenna 2 106_2, transmitting panel antenna 3 106_3, and transmitting panel antenna 4 106_4. In Figures 32A and 32B, similar to Figure 16A, the feedback signal group 2702 is assumed to have a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and to have frequency bands ♭1, ♭2, ..., and ♭K.

[0562] 32A and 32B deal only with a feedback signal addressed to terminal #1 of 902_1. However, although not shown in FIGS. 32A and 32B, there may be feedback signals addressed to terminals other than terminal #1 of 902_1.

[0563] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in the feedback signal group 2702, as shown in FIG. 32A, feedback signal (1) destined for terminal #1, 3211_11, exists in frequency band ♭K of the first transmission interval, and as shown in FIG. 32B, feedback signal (2) destined for terminal #1, 3211_12, exists in frequency band ♭K of the third transmission interval.

[0564] For example, as shown in Fig. 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) of 3211_11 addressed to terminal #1" existing in frequency band ♭K of the first transmission interval as shown in Fig. 32A, and "feedback signal (2) of 3211_12 addressed to terminal #1" existing in frequency band ♭K of the third transmission interval as shown in Fig. 32B. At this time, "feedback signal (1) of 3211_11 addressed to terminal #1" is transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1, and "feedback signal (2) of 3211_12 addressed to terminal #1" is transmitted from transmitting panel antenna 2 of 106_2 of base station #1 of 901_1.

[0565] In this way, the reason why there exists "feedback signal (1) for terminal #1 of 3211_11" and "feedback signal (2) for terminal #1 of 3211_12" is that "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1."

[0566] At this time, the "feedback signal (1) addressed to terminal #1 of 3211_11" includes, for example, information that terminal #1 of 902_1 and (base station #1 of 901_1) are capable of communicating using transmitting panel antenna 1 of 106_1.

[0567] In addition, the "feedback signal (2) addressed to terminal #1 of 3211_12" includes, for example, information that terminal #1 of 902_1 and (base station #1 of 901_1) can communicate using transmitting panel antenna 2 of 106_2.

[0568] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with good reception quality, and frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects the transmitting panel antenna and sets the beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) addressed to terminal #1 of 3211_11" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 32A, and "feedback signal (2) addressed to terminal #1 of 3211_12" which exists in frequency band ♭K of the third transmission section, as shown in FIG. 32B.

[0569] 32A and 32B, there may be a feedback signal addressed to a terminal other than terminal #1 of 902_1 (see, for example, FIG. 16B).

[0570] In the above example, as shown in Figures 32A and 32B, base station #1 of 901_1 transmits a "feedback signal (1) of 3211_11 addressed to terminal #1" and a "feedback signal (2) of 3211_12 addressed to terminal #1" to terminal #1 of 902_1, but base station #1 of 901_1 may also transmit three or more feedback signals to terminal #1 of 902_1.

[0571] Figures 33A and 33B show an example of the configuration of a frame group 2703 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 27. Note that in Figures 33A and 33B, the horizontal axis represents time and the vertical axis represents frequency. In Figures 33A and 33B, similar to Figure 17A, the frame group 2703 including data symbols includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0572] 33A and 33B deal with a modulated signal (slot) addressed to terminal #1 of 902_1. However, although not shown in FIGS. 33A and 33B, a modulated signal (slot) addressed to a terminal other than terminal #1 of 902_1 may also exist.

[0573] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in frame group 2703 containing data symbols, as shown in Figure 33A, modulated signal (slot) (1) addressed to terminal #1 of 3311_11 exists in frequency band ♭K of the first transmission interval, and as shown in Figure 33B, modulated signal (slot) (2) addressed to terminal #1 of 3311_12 exists in frequency band ♭K of the third transmission interval.

[0574] For example, as shown in Fig. 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3311_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission interval as shown in Fig. 33A, and "modulated signal (slot) (2) of 3311_12 addressed to terminal #1" which exists in frequency band ♭K of the third transmission interval as shown in Fig. 33B. At this time, "modulated signal (slot) (1) of 3311_11 addressed to terminal #1" is transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1, and "modulated signal (slot) (2) of 3311_12 addressed to terminal #1" is transmitted from transmitting panel antenna 2 of 106_2 of base station #1 of 901_1.

[0575] In this way, the reason why there are "modulated signal (slot) (1) addressed to terminal #1 at 3311_11" and "modulated signal (slot) (2) addressed to terminal #1 at 3311_12" is because "base station #1 at 901_1 transmits two modulated signals (streams) to terminal #1 at 902_1."

[0576] At this time, it is assumed that the "modulated signal (slot) (1) of 3311_11 addressed to terminal #1" contains, for example, a data symbol (data, information) of 902_1 addressed to terminal #1.

[0577] In addition, it is assumed that the "modulated signal (slot) (2) of 3311_12 addressed to terminal #1" also includes, for example, a data symbol (data, information) of 902_1 addressed to terminal #1.

[0578] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with the best reception quality" and "frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna and sets beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3311_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 33A, and "modulated signal (slot) (2) of 3311_12 addressed to terminal #1" which exists in frequency band ♭K of the third transmission section, as shown in FIG. 33B.

[0579] 33A and 33B, there may be modulated signals (slots) addressed to terminals other than terminal #1 of 902_1 (see, for example, FIG. 17B).

[0580] In the above example, as shown in Figures 33A and 33B, base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3311_11 addressed to terminal #1" and "modulated signal (slot) (2) of 3311_12 addressed to terminal #1," but base station #1 of 901_1 may transmit three or more modulated signals (slots) (modulated signals (slots) using multiple time resources) to terminal #1 of 902_1.

[0581] In addition, in the "modulated signal (slot) (1) of 3311_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 3311_12 addressed to terminal #1", in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS", pilot symbols, pilot signals, preambles, symbols including control information, etc. In addition, symbols including control information may include information on the destination terminal (ID that can identify the terminal), information on the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0582] <Case 4> Figures 34A and 34B show an example of the configuration of a feedback signal group 2702 transmitted by base station #1 901_1, which exists in the time interval from t2 to t3 in Figure 27. Note that in Figures 34A and 34B, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, base station #1 901_1 is assumed to have four transmitting panel antennas: transmitting panel antenna 1 106_1, transmitting panel antenna 2 106_2, transmitting panel antenna 3 106_3, and transmitting panel antenna 4 106_4. In Figures 34A and 34B, similar to Figure 16A, the feedback signal group 2702 is assumed to have a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and to have frequency bands ♭1, ♭2, ..., and ♭K.

[0583] 34A and 34B deal only with a feedback signal addressed to terminal #1 of 902_1. However, although not shown in FIGS. 34A and 34B, there may be feedback signals addressed to terminals other than terminal #1 of 902_1.

[0584] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in the feedback signal group 2702, as shown in Figure 34A, feedback signal (1) addressed to terminal #1, 3411_11, exists in frequency band ♭K of the first transmission interval, and as shown in Figure 34B, feedback signal (2) addressed to terminal #1, 3411_12, exists in frequency band ♭2 of the third transmission interval.

[0585] For example, as shown in Fig. 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) of 3411_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission interval as shown in Fig. 34A, and "feedback signal (2) of 3411_12 addressed to terminal #1" which exists in frequency band ♭2 of the third transmission interval as shown in Fig. 34B. At this time, "feedback signal (1) of 3411_11 addressed to terminal #1" is transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1, and "feedback signal (2) of 3411_12 addressed to terminal #1" is transmitted from transmitting panel antenna 2 of 106_2 of base station #1 of 901_1.

[0586] In this way, the reason why there are "feedback signal (1) for terminal #1 at 3411_11" and "feedback signal (2) for terminal #1 at 3411_12" is that "base station #1 at 901_1 transmits two modulated signals (streams) to terminal #1 at 902_1."

[0587] In this case, the "feedback signal (1) addressed to terminal #1 of 3411_11" contains, for example, information that terminal #1 of 902_1 and (base station #1 of 901_1) can communicate using transmitting panel antenna 1 of 106_1.

[0588] In addition, the "feedback signal (2) addressed to terminal #1 of 3411_12" includes, for example, information that terminal #1 of 902_1 and (base station #1 of 901_1) can communicate using transmitting panel antenna 2 of 106_2.

[0589] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with good reception quality, and frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects the transmitting panel antenna and sets the beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) addressed to terminal #1 of 3411_11" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 34A, and "feedback signal (2) addressed to terminal #1 of 3411_12" which exists in frequency band ♭2 of the third transmission section, as shown in FIG. 34B.

[0590] 34A and 34B, there may be a feedback signal addressed to a terminal other than terminal #1 of 902_1 (see, for example, FIG. 16B).

[0591] In the above example, as shown in Figures 34A and 34B, base station #1 of 901_1 transmits a "feedback signal (1) addressed to terminal #1 of 3411_11" and a "feedback signal (2) addressed to terminal #1 of 3411_12" to terminal #1 of 902_1, but base station #1 of 901_1 may also transmit three or more feedback signals to terminal #1 of 902_1.

[0592] Figures 35A and 35B show an example of the configuration of a frame group 2703 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 27. Note that in Figures 35A and 35B, the horizontal axis represents time and the vertical axis represents frequency. In Figures 35A and 35B, similar to Figure 17A, the frame group 2703 including data symbols includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0593] 35A and 35B deal with a modulated signal (slot) addressed to terminal #1 of 902_1. However, although not shown in FIGS. 35A and 35B, a modulated signal (slot) addressed to a terminal other than terminal #1 of 902_1 may also exist.

[0594] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in frame group 2703 containing data symbols, as shown in Figure 35A, modulated signal (slot) (1) addressed to terminal #1 of 3511_11 exists in frequency band ♭K of the first transmission interval, and as shown in Figure 35B, modulated signal (slot) (2) addressed to terminal #1 of 3511_12 exists in frequency band ♭2 of the third transmission interval.

[0595] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3511_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission interval as shown in Figure 35A, and "modulated signal (slot) (2) of 3511_12 addressed to terminal #1" which exists in frequency band ♭2 of the third transmission interval as shown in Figure 35B. At this time, "modulated signal (slot) (1) of 3511_11 addressed to terminal #1" is transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1, and "modulated signal (slot) (2) of 3511_12 addressed to terminal #1" is transmitted from transmitting panel antenna 2 of 106_2 of base station #1 of 901_1.

[0596] In this way, the reason why there are "modulated signal (slot) (1) addressed to terminal #1 at 3511_11" and "modulated signal (slot) (2) addressed to terminal #1 at 3511_12" is because "base station #1 at 901_1 transmits two modulated signals (streams) to terminal #1 at 902_1."

[0597] At this time, it is assumed that the "modulated signal (slot) (1) of 3511_11 addressed to terminal #1" contains, for example, a data symbol (data, information) of 902_1 addressed to terminal #1.

[0598] In addition, it is assumed that the "modulated signal (slot) (2) of 3511_12 addressed to terminal #1" also includes, for example, a data symbol (data, information) of 902_1 addressed to terminal #1.

[0599] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with the best reception quality" and "frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna and sets beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3511_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission section, as shown in FIG. 35A, and "modulated signal (slot) (2) of 3511_12 addressed to terminal #1" which exists in frequency band ♭2 of the third transmission section, as shown in FIG. 35B.

[0600] 35A and 35B, there may be modulated signals (slots) addressed to terminals other than terminal #1 of 902_1 (see, for example, FIG. 17B).

[0601] In the above example, as shown in Figures 35A and 35B, base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3511_11 addressed to terminal #1" and "modulated signal (slot) (2) of 3511_12 addressed to terminal #1," but base station #1 of 901_1 may also transmit three or more modulated signals (slots) (modulated signals (slots) using multiple frequencies and time resources) to terminal #1 of 902_1.

[0602] In addition, in the "modulated signal (slot) (1) of 3511_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 3511_12 addressed to terminal #1", in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS", pilot symbols, pilot signals, preambles, symbols including control information, etc. In addition, symbols including control information may include information on the destination terminal (ID that can identify the terminal), information on the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0603] <Case 5> Figure 36 shows an example of the configuration of a feedback signal group 2702 transmitted by base station #1 901_1, which exists in the time interval from t2 to t3 in Figure 27. In Figure 36, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, base station #1 901_1 is assumed to have four transmitting panel antennas: transmitting panel antenna 1 106_1, transmitting panel antenna 2 106_2, transmitting panel antenna 3 106_3, and transmitting panel antenna 4 106_4. In Figure 36, similar to Figure 16A, the feedback signal group 2702 includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0604] 36 deals only with a feedback signal addressed to terminal #1 of 902_1, but although not shown in FIG. 36, there may be feedback signals addressed to terminals other than terminal #1 of 902_1.

[0605] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in the feedback signal group 2702, as shown in FIG. 36, feedback signal (1) addressed to terminal #1 at 3611_11 exists in frequency band ♭K of the first transmission period, and feedback signal (2) addressed to terminal #1 at 3611_12 exists in frequency band ♭2 of the first transmission period.

[0606] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits "feedback signal (1) addressed to terminal #1 of 3611_11" present in frequency band ♭K of the first transmission interval, and "feedback signal (2) addressed to terminal #1 of 3611_12" present in frequency band ♭2 of the first transmission interval, to terminal #1 of 902_1, as shown in Figure 36. At this time, both "feedback signal (1) addressed to terminal #1 of 3611_11" and "feedback signal (2) addressed to terminal #1 of 3611_12" are assumed to be transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1. (In other words, one transmitting panel antenna is selected.)

[0607] In this way, the reason why there exists "feedback signal (1) for terminal #1 of 3611_11" and "feedback signal (2) for terminal #1 of 3611_12" is because "base station #1 of 901_1 transmits two resources (slots) to terminal #1 of 902_1."

[0608] In this case, the "feedback signal (1) addressed to terminal #1 of 3611_11" and the "feedback signal (2) addressed to terminal #1 of 3611_12" contain information that, for example, terminal #1 of 902_1 and (base station #1 of 901_1) are capable of communication using transmitting panel antenna 1 of 106_1.

[0609] Based on the "information on the two base station #1 of 901_1's 'transmitting panel antennas and parameters' with good reception quality, and frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects the transmitting panel antenna and sets the beamforming parameters, and transmits to terminal #1 of 902_1, as shown in FIG. 36, "feedback signal (1) addressed to terminal #1 of 3611_11" present in frequency band ♭K of the first transmission section, and "feedback signal (2) addressed to terminal #1 of 3611_12" present in frequency band ♭2 of the first transmission section.

[0610] Also, in FIG. 36, there may be a feedback signal addressed to a terminal other than terminal #1 of 902_1 (see, for example, FIG. 16B).

[0611] In the above example, as shown in FIG. 36, base station #1 of 901_1 transmits "feedback signal (1) addressed to terminal #1 of 3611_11" and "feedback signal (2) addressed to terminal #1 of 3611_12" to terminal #1 of 902_1, but base station #1 of 901_1 may transmit three or more feedback signals to terminal #1 of 902_1.

[0612] Figure 37 shows an example of the configuration of a frame group 2703 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 27. Note that in Figure 37, the horizontal axis represents time and the vertical axis represents frequency. In Figure 37, as in Figure 17A, the frame group 2703 including data symbols includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0613] 37 deals with a modulated signal (slot) addressed to terminal #1 of 902_1. However, although not shown in FIG. 37, a modulated signal (slot) addressed to a terminal other than terminal #1 of 902_1 may exist.

[0614] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in frame group 2703 containing data symbols, as shown in FIG. 37, modulated signal (slot) (1) addressed to terminal #1 of 3711_11 exists in frequency band ♭K of the first transmission period, and modulated signal (slot) (2) addressed to terminal #1 of 3711_12 exists in frequency band ♭2 of the first transmission period.

[0615] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits "modulated signal (slot) (1) of 3711_11 addressed to terminal #1" in frequency band ♭K of the first transmission interval, and "modulated signal (slot) (2) of 3711_12 addressed to terminal #1" in frequency band ♭2 of the first transmission interval, to terminal #1 of 902_1, as shown in Figure 37. At this time, "modulated signal (slot) (1) of 3711_11 addressed to terminal #1" and "modulated signal (slot) (2) of 3711_12 addressed to terminal #1" are transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1. (In other words, one transmitting panel antenna is selected.)

[0616] In this way, the reason why there are "modulated signal (slot) (1) addressed to terminal #1 at 3711_11" and "modulated signal (slot) (2) addressed to terminal #1 at 3711_12" is because "base station #1 at 901_1 transmits two resources (slots) to terminal #1 at 902_1."

[0617] In this case, the "modulated signal (slot) (1) of 3711_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 3711_12 addressed to terminal #1" are assumed to contain, for example, a data symbol (data, information) addressed to terminal #1 of 902_1.

[0618] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with the best reception quality" and "frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna and sets beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3711_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission section, and "modulated signal (slot) (2) of 3711_12 addressed to terminal #1" which exists in frequency band ♭2 of the first transmission section, as shown in FIG. 37.

[0619] Also, in FIG. 37, there may be modulated signals (slots) addressed to terminals other than terminal #1 of 902_1 (see, for example, FIG. 17B).

[0620] In the above example, as shown in FIG. 37, base station #1 of 901_1 transmits "modulated signal (slot) (1) of 3711_11 addressed to terminal #1" and "modulated signal (slot) (2) of 3711_12 addressed to terminal #1" to terminal #1 of 902_1, but base station #1 of 901_1 may transmit three or more modulated signals (slots) (modulated signals (slots) using multiple frequency resources) to terminal #1 of 902_1.

[0621] In addition, in the "modulated signal (slot) (1) of 3711_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 3711_12 addressed to terminal #1", in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS", pilot symbols, pilot signals, preambles, symbols including control information, etc. In addition, symbols including control information may include information on the destination terminal (ID that can identify the terminal), information on the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0622] <Case 6> Figure 38 shows an example of the configuration of a feedback signal group 2702 transmitted by base station #1 901_1, which exists in the time interval from t2 to t3 in Figure 27. In Figure 38, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, base station #1 901_1 is assumed to have four transmitting panel antennas: transmitting panel antenna 1 106_1, transmitting panel antenna 2 106_2, transmitting panel antenna 3 106_3, and transmitting panel antenna 4 106_4. In Figure 38, similar to Figure 16A, the feedback signal group 2702 includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0623] 38 deals only with a feedback signal addressed to terminal #1 of 902_1, but although not shown in FIG. 38, there may be feedback signals addressed to terminals other than terminal #1 of 902_1.

[0624] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in the feedback signal group 2702, as shown in FIG. 38, feedback signal (1) addressed to terminal #1 at 3811_11 exists in frequency band ♭K of the first transmission interval, and feedback signal (2) addressed to terminal #1 at 3811_12 exists in frequency band ♭K of the third transmission interval.

[0625] For example, as shown in FIG. 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits "feedback signal (1) of 3811_11 addressed to terminal #1" present in frequency band ♭K of the first transmission interval, and "feedback signal (2) of 3811_12 addressed to terminal #1" present in frequency band ♭K of the third transmission interval, to terminal #1 of 902_1, as shown in FIG. 38. At this time, both "feedback signal (1) of 3811_11 addressed to terminal #1" and "feedback signal (2) of 3811_12 addressed to terminal #1" are assumed to be transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1. (In other words, one transmitting panel antenna is selected.)

[0626] In this way, the reason why there exists "feedback signal (1) for terminal #1 of 3811_11" and "feedback signal (2) for terminal #1 of 3811_12" is because "base station #1 of 901_1 transmits two resources (slots) to terminal #1 of 902_1."

[0627] In this case, the "feedback signal (1) addressed to terminal #1 of 3811_11" and the "feedback signal (2) addressed to terminal #1 of 3811_12" contain information that, for example, terminal #1 of 902_1 and (base station #1 of 901_1) are capable of communication using transmitting panel antenna 1 of 106_1.

[0628] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with good reception quality, and frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects the transmitting panel antenna and sets the beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) addressed to terminal #1 of 3811_11" present in frequency band ♭K of the first transmission section, and "feedback signal (2) addressed to terminal #1 of 3811_12" present in frequency band ♭K of the third transmission section, as shown in FIG. 38.

[0629] In addition, in FIG. 38, there may be a feedback signal addressed to a terminal other than terminal #1 of 902_1 (see, for example, FIG. 16B).

[0630] In the above example, as shown in FIG. 38, base station #1 of 901_1 transmits "feedback signal (1) addressed to terminal #1 of 3811_11" and "feedback signal (2) addressed to terminal #1 of 3811_12" to terminal #1 of 902_1, but base station #1 of 901_1 may transmit three or more feedback signals to terminal #1 of 902_1.

[0631] Figure 39 shows an example of the configuration of a frame group 2703 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 27. Note that in Figure 39, the horizontal axis represents time and the vertical axis represents frequency. In Figure 39, as in Figure 17A, the frame group 2703 including data symbols includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0632] 39 deals with a modulated signal (slot) addressed to terminal #1 of 902_1. However, although not shown in FIG. 39, a modulated signal (slot) addressed to a terminal other than terminal #1 of 902_1 may also exist.

[0633] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in frame group 2703 containing data symbols, as shown in FIG. 39, modulated signal (slot) (1) addressed to terminal #1 of 3911_11 exists in frequency band ♭K of the first transmission interval, and modulated signal (slot) (2) addressed to terminal #1 of 3911_12 exists in frequency band ♭K of the third transmission interval.

[0634] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits "modulated signal (slot) (1) of 3911_11 addressed to terminal #1" in frequency band ♭K of the first transmission interval, and "modulated signal (slot) (2) of 3911_12 addressed to terminal #1" in frequency band ♭K of the third transmission interval, to terminal #1 of 902_1, as shown in Figure 39. At this time, "modulated signal (slot) (1) of 3911_11 addressed to terminal #1" and "modulated signal (slot) (2) of 3911_12 addressed to terminal #1" are transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1. (In other words, one transmitting panel antenna is selected.)

[0635] In this way, the reason why there are "modulated signal (slot) (1) addressed to terminal #1 at 3911_11" and "modulated signal (slot) (2) addressed to terminal #1 at 3911_12" is because "base station #1 at 901_1 transmits two resources (slots) to terminal #1 at 902_1."

[0636] In this case, the "modulated signal (slot) (1) of 3911_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 3911_12 addressed to terminal #1" are assumed to contain, for example, data symbols (data, information) addressed to terminal #1 of 902_1.

[0637] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with the best reception quality" and "frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna and sets beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 3911_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission section, and "modulated signal (slot) (2) of 3911_12 addressed to terminal #1" which exists in frequency band ♭K of the third transmission section, as shown in FIG. 39.

[0638] Also, in FIG. 39, there may be modulated signals (slots) addressed to terminals other than terminal #1 of 902_1 (see, for example, FIG. 17B).

[0639] In the above example, as shown in FIG. 39, base station #1 of 901_1 transmits "modulated signal (slot) (1) of 3911_11 addressed to terminal #1" and "modulated signal (slot) (2) of 3911_12 addressed to terminal #1" to terminal #1 of 902_1, but base station #1 of 901_1 may transmit three or more modulated signals (slots) (modulated signals (slots) using multiple time resources) to terminal #1 of 902_1.

[0640] In addition, in the "modulated signal (slot) (1) of 3911_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 3911_12 addressed to terminal #1", in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS", pilot symbols, pilot signals, preambles, symbols including control information, etc. In addition, symbols including control information may include information on the destination terminal (ID that can identify the terminal), information on the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0641] <Case 7> Figure 40 shows an example of the configuration of feedback signal group 2702 transmitted by base station #1 901_1, which exists in the time interval from t2 to t3 in Figure 27. In Figure 40, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, base station #1 901_1 is assumed to have four transmitting panel antennas: transmitting panel antenna 1 106_1, transmitting panel antenna 2 106_2, transmitting panel antenna 3 106_3, and transmitting panel antenna 4 106_4. In Figure 40, similar to Figure 16A, feedback signal group 2702 includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0642] 40 deals with only the feedback signal addressed to terminal #1 of 902_1, however, although not shown in FIG. 40, there may be feedback signals addressed to terminals other than terminal #1 of 902_1.

[0643] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in the feedback signal group 2702, as shown in FIG. 40, feedback signal (1) addressed to terminal #1 at 4011_11 exists in frequency band ♭K of the first transmission interval, and feedback signal (2) addressed to terminal #1 at 4011_12 exists in frequency band ♭2 of the third transmission interval.

[0644] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits "feedback signal (1) addressed to terminal #1 of 4011_11" in frequency band ♭K of the first transmission interval and "feedback signal (2) addressed to terminal #1 of 4011_12" in frequency band ♭2 of the third transmission interval to terminal #1 of 902_1, as shown in Figure 40. At this time, both "feedback signal (1) addressed to terminal #1 of 4011_11" and "feedback signal (2) addressed to terminal #1 of 4011_12" are assumed to be transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1. (In other words, one transmitting panel antenna is selected.)

[0645] In this way, the reason why there exists "feedback signal (1) for terminal #1 at 4011_11" and "feedback signal (2) for terminal #1 at 4011_12" is because "base station #1 at 901_1 transmits two resources (slots) to terminal #1 at 902_1."

[0646] In this case, the "feedback signal (1) addressed to terminal #1 at 4011_11" and the "feedback signal (2) addressed to terminal #1 at 4011_12" contain information that, for example, terminal #1 at 902_1 and (base station #1 at 901_1) are capable of communication using transmitting panel antenna 1 at 106_1.

[0647] Based on the "information on the two base station #1 of 901_1's 'transmitting panel antennas and parameters' with good reception quality and frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects the transmitting panel antenna and sets the beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "feedback signal (1) addressed to terminal #1 of 4011_11" which exists in frequency band ♭K of the first transmission section, and "feedback signal (2) addressed to terminal #1 of 4011_12" which exists in frequency band ♭2 of the third transmission section, as shown in FIG. 40.

[0648] 40, there may be a feedback signal addressed to a terminal other than terminal #1 of 902_1 (see, for example, FIG. 16B).

[0649] In the above example, as shown in FIG. 40, base station #1 of 901_1 transmits "feedback signal (1) for terminal #1 of 4011_11" and "feedback signal (2) for terminal #1 of 4011_12" to terminal #1 of 902_1, but base station #1 of 901_1 may transmit three or more feedback signals to terminal #1 of 902_1.

[0650] Figure 41 shows an example of the configuration of a frame group 2703 including data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 27. Note that in Figure 41, the horizontal axis represents time and the vertical axis represents frequency. In Figure 41, similar to Figure 17A, in the frame group 2703 including data symbols, there are a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and there are frequency bands ♭1, ♭2, ..., and ♭K.

[0651] 41 deals with a modulated signal (slot) addressed to terminal #1 of 902_1. However, although not shown in FIG. 41, a modulated signal (slot) addressed to a terminal other than terminal #1 of 902_1 may also exist.

[0652] In this example, since the "number of time divisions in which a terminal can transmit a reference signal for sector sweep when transmitting a reference signal for sector sweep" is 4, in frame group 2703 containing data symbols, as shown in FIG. 41, modulated signal (slot) (1) addressed to terminal #1 of 4111_11 exists in frequency band ♭K of the first transmission interval, and modulated signal (slot) (2) addressed to terminal #1 of 4111_12 exists in frequency band ♭2 of the third transmission interval.

[0653] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits sector sweep reference signal 1401_1, base station #1 of 901_1 transmits "modulated signal (slot) (1) of 4111_11 addressed to terminal #1" in frequency band ♭K of the first transmission interval, and "modulated signal (slot) (2) of 4111_12 addressed to terminal #1" in frequency band ♭2 of the third transmission interval, to terminal #1 of 902_1, as shown in Figure 41. At this time, "modulated signal (slot) (1) of 4111_11 addressed to terminal #1" and "modulated signal (slot) (2) of 4111_12 addressed to terminal #1" are transmitted from transmitting panel antenna 1 of 106_1 of base station #1 of 901_1. (In other words, one transmitting panel antenna is selected.)

[0654] In this way, the reason why there are "modulated signal (slot) (1) of 4111_11 addressed to terminal #1" and "modulated signal (slot) (2) of 4111_12 addressed to terminal #1" is because "base station #1 of 901_1 transmits two resources (slots) to terminal #1 of 902_1."

[0655] In this case, it is assumed that "modulated signal (slot) (1) of 4111_11 addressed to terminal #1" and "modulated signal (slot) (2) of 4111_12 addressed to terminal #1" contain, for example, data symbols (data, information) addressed to terminal #1 of 902_1.

[0656] Based on the "information on the two transmitting panel antennas and parameters of base station #1 of 901_1 with the best reception quality" and "frequency (band) information" transmitted by terminal #1 of 902_1, base station #1 of 901_1 selects a transmitting panel antenna and sets beamforming parameters, and base station #1 of 901_1 transmits to terminal #1 of 902_1 "modulated signal (slot) (1) of 4111_11 addressed to terminal #1" which exists in frequency band ♭K of the first transmission section, and "modulated signal (slot) (2) of 4111_12 addressed to terminal #1" which exists in frequency band ♭2 of the third transmission section, as shown in FIG. 41.

[0657] In addition, in FIG. 41, there may be modulated signals (slots) addressed to terminals other than terminal #1 of 902_1 (see, for example, FIG. 17B).

[0658] In the above example, as shown in FIG. 41, base station #1 of 901_1 transmits "modulated signal (slot) (1) of 4111_11 addressed to terminal #1" and "modulated signal (slot) (2) of 4111_12 addressed to terminal #1" to terminal #1 of 902_1, but base station #1 of 901_1 may transmit three or more modulated signals (slots) (modulated signals (slots) using multiple frequencies and time resources) to terminal #1 of 902_1.

[0659] In addition, in the "modulated signal (slot) (1) of 4111_11 addressed to terminal #1" and the "modulated signal (slot) (2) of 4111_12 addressed to terminal #1", in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS", pilot symbols, pilot signals, preambles, symbols including control information, etc. In addition, symbols including control information may include information on the destination terminal (ID that can identify the terminal), information on the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0660] As described above, for example, by transmitting modulated signals as in <Case 1> to <Case 7>, it is possible to reduce interference between modulated signals, and by efficiently allocating modulated signals and slots, it is possible to obtain the effect of improving data transmission efficiency.

[0661] In addition, the base station and the terminal may communicate using any of the methods from <Case 1> to <Case 7>, and the communication between the base station and the terminal may be performed by selecting any of the communication methods from <Case 1> to <Case 7> depending on the radio wave propagation environment, communication conditions, etc.

[0662] 42 shows an example of a situation in which base station #1 of 901_1 and "terminals such as terminal #1 of 902_1" are communicating in FIG. 9. FIG. 42(A) shows an example of a transmission situation of a modulated signal from base station #1 of 901_1, and FIG. 42(B) shows an example of a transmission situation of a modulated signal from "terminals such as terminal #1 of 902_1." In FIG. 42(A) and FIG. 42(B), the horizontal axis represents time. In FIG. 42, elements that operate in the same way as in FIG. 18 are assigned the same numbers.

[0663] First, base station #1 901_1 transmits a sector sweep reference signal 1801_1. Note that this has already been explained using FIG. 27, so further explanation will be omitted.

[0664] Then, "terminals such as terminal #1 of 902_1" transmit sector sweep reference signals 1851_1. Note that this point has already been explained using Figures 13 and 14, and therefore further explanation will be omitted.

[0665] Base station #1 of 901_1 transmits feedback signal group 4202_1. Note that this point has already been explained using Figures 28A, 28B, 30A, 30B, 32A, 32B, 34A, 34B, 36, 38, and 40, so further explanation will be omitted.

[0666] Thereafter, base station #1 of 901_1 transmits "frame group 4203_1 including data symbols." Note that this point has already been explained using Figures 29A, 29B, 31A, 31B, 33A, 33B, 35A, 35B, 37, 39, and 41, so further explanation will be omitted. (Therefore, "frame 4203_1 including data symbols" is considered to be, for example, a frame for downlink.)

[0667] Then, "terminals such as terminal #1 of 902_1" transmit "frame group 4252_1 including data symbols." The configuration of this frame will be explained later using "Figures 44A and 44B," "45A and 45B," "46A and 46B," "47A and 47B," "48," "49," and "50." (Therefore, "frame group 4252_1 including data symbols" is considered to be, for example, frames for the uplink.)

[0668] Next, base station #1 of 901_1 transmits "frame group 4203_2 including data symbols." Note that the method of configuring "frame group 4203_2 including data symbols" is as described with reference to Figures 29A, 29B, 31A, 31B, 33A, 33B, 35A, 35B, 37, 39, and 41.

[0669] Then, terminals such as "terminal #1 of 902_1 and terminal #2 of 902_2" transmit "frame group 4252_2 including data symbols." Note that the configuration of this frame will be explained later using "FIGS. 44A and 44B," "45A and 45B," "46A and 46B," "47A and 47B," "48," "49," and "50."

[0670] Fig. 43 shows an example of the transmission status of modulated signals from base station #1 of 901_1 and "terminals such as terminal #1 of 902_1" after Fig. 42. In Fig. 43, the same numbers are used for components that operate in the same way as in Fig. 18.

[0671] FIG. 43A 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. 42A.

[0672] Figure 43 (B) shows an example of the transmission status of modulated signals from "terminal #1 of 902_1 and terminal #2 of 902_2," which is a temporal continuation of the transmission status of modulated signals from "terminals such as terminal #1 of 902_1" in Figure 42 (B).

[0673] In addition, in Figures 43(A) and 43(B), the horizontal axis represents time.

[0674] 42(A) and 42(B), base station #1 of 901_1 transmits "frame group 4203_3 including data symbols." Note that the method of configuring "frame group 4203_3 including data symbols" is as explained using FIGS. 29A, 29B, 31A, 31B, 33A, 33B, 35A, 35B, 37, 39, and 41.

[0675] Then, "terminals such as terminal #1 of 902_1" transmit "frame group 4252_3 including data symbols." Note that the configuration of this frame will be explained later using "FIGS. 44A and 44B," "45A and 45B," "46A and 46B," "47A and 47B," "48," "49," and "50."

[0676] Next, base station #1 of 901_1 transmits a sector sweep reference signal 1801_2. Note that this point has already been explained using FIG. 27, so further explanation will be omitted.

[0677] Then, "terminals such as terminal #1 of 902_1" transmit sector sweep reference signals 1851_2. Note that this point has already been explained using Figures 13 and 14, and therefore further explanation will be omitted.

[0678] Base station #1 of 901_1 transmits feedback signal group 4202_2. Note that this point has already been explained using Figures 28A, 28B, 30A, 30B, 32A, 32B, 34A, 34B, 36, 38, and 40, so further explanation will be omitted.

[0679] Thereafter, base station #1 of 901_1 transmits "frame group 4203_4 including data symbols." Note that this point has already been explained using Figures 29A, 29B, 31A, 31B, 33A, 33B, 35A, 35B, 37, 39, and 41, so further explanation will be omitted.

[0680] Then, "terminals such as terminal #1 of 902_1" transmit "frame group 4252_4 including data symbols." Note that the configuration of this frame will be explained later using "FIGS. 44A and 44B," "45A and 45B," "46A and 46B," "47A and 47B," "48," "49," and "50."

[0681] In this way, before "base station #1 of 901_1 transmits a 'frame group including data symbols' and / or terminals such as "terminal #1 of 902_1 and terminal #2 of 902_2 transmit a 'frame group including data symbols'", base station #1 of 901_1 and the terminal transmit a sector sweep reference signal, and after "base station #1 of 901_1 transmits a 'frame group including data symbols' and / or terminals such as "terminal #1 of 902_1 and terminal #2 of 902_2 transmit a 'frame group 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 terminal can achieve high data reception quality.

[0682] Next, a configuration example of a "frame group 4252_i including data symbols" transmitted by terminals such as "terminal #1 902_1, terminal #2 902_2" will be described. Note that, for example, i is an integer of 1 or more.

[0683] As explained above, it is assumed that terminal #i of 902_i has the configuration shown in Figures 1A, 1B, and 1C. It is also assumed that terminal #i of 902_i having the configuration shown in Figures 1A, 1B, and 1C has transmitting panel antenna xi of 106_xi with the configuration shown in Figure 3. However, the configuration of terminal #i of 902_i is not limited to the configuration shown in Figures 1A, 1B, and 1C, and the configuration of transmitting panel antenna xi of 106_xi of terminal #i of 902_i having the configuration shown in Figures 1A, 1B, and 1C is not limited to that shown in Figure 3.

[0684] Several cases will be explained below.

[0685] <Case A1> Figures 44A and 44B show an example of the configuration of a "frame group 4252_i including data symbols." Note that in Figures 44A and 44B, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, terminal #1 of 902_1 is assumed to have four transmission panel antennas: transmission panel antenna 1 of 106_1, transmission panel antenna 2 of 106_2, transmission panel antenna 3 of 106_3, and transmission panel antenna 4 of 106_4. In Figures 44A and 44B, similar to Figures 20A, 20B, 20C, 20D, 20E, and 20F, the "frame group 4252_i including data symbols" includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0686] 44A and 44B deal with frames (slots, modulated signals) transmitted by terminal #1 of 902_1. However, although not shown in FIGS. 44A and 44B, frames (slots, modulated signals) transmitted by terminals other than terminal #1 of 902_1 may also exist (see FIGS. 20A, 20B, 20C, 20D, 20E, and 20F).

[0687] In this example, in frame group 4252_i containing data symbols, as shown in FIG. 44A, "terminal #1 transmission frame (1) of 4411_11" transmitted by terminal #1 of 902_1 exists in frequency band ♭K of the first transmission period, and as shown in FIG. 44B, "terminal #1 transmission frame (2) of 4411_12" transmitted by terminal #1 of 902_1 exists in frequency band ♭K of the first transmission period.

[0688] It is noted that the term "frame group containing data symbols" is used because, in the same frequency band and same transmission period, there can be a "frame containing data symbols" transmitted from transmitting panel antenna 1 106_1, a "frame containing data symbols" transmitted from transmitting panel antenna 2 106_2, a "frame containing data symbols" transmitted from transmitting panel antenna 3 106_3, and a "frame containing data symbols" transmitted from transmitting panel antenna 4 106_4.

[0689] For example, terminal #1 of 902_1 transmits to base station #1 of 901_1 "terminal #1 transmission frame (1) of 4411_11" existing in frequency band ♭K of the first transmission section as shown in Fig. 44A, and "terminal #1 transmission frame (2) of 4411_12" existing in frequency band ♭K of the first transmission section as shown in Fig. 44B. At this time, "terminal #1 transmission frame (1) of 4411_11" is transmitted from transmission panel antenna 1 of 106_1 of terminal #1 of 902_1, and "terminal #1 transmission frame (2) of 4411_12" is transmitted from transmission panel antenna 2 of 106_2 of terminal #1 of 902_1.

[0690] In this way, the reason why "terminal #1 transmission frame (1) of 4411_11" and "terminal #1 transmission frame (2) of 4411_12" exist is because "terminal #1 of 902_1 transmits two modulated signals (streams) to base station #1 of 901_1."

[0691] At this time, it is assumed that the "transmission frame (1) of terminal #1 of 4411_11" contains, for example, a data symbol (data, information) addressed to base station #1 of 901_1.

[0692] In addition, it is assumed that "transmission frame (2) of terminal #1 of 4411_12" also includes, for example, a data symbol (data, information) addressed to base station #1 of 901_1.

[0693] In the above example, as shown in Figures 44A and 44B, terminal #1 of 902_1 transmits "terminal #1 transmission frame (1) of 4411_11" and "terminal #1 transmission frame (2) of 4411_12" to base station #1 of 901_1, but terminal #1 of 902_1 may transmit three or more frames (slots, modulated signals) (multiple frames (slots, modulated signals) using the same frequency resource) to base station #1 of 901_1. Also, terminal #1 of 902_1 may transmit one frame (slot, modulated signal) to base station #1 of 901_1.

[0694] In addition, in "terminal #1 transmission frame (1) of 4411_11" and "terminal #1 transmission frame (2) of 4411_12," in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS, etc.", pilot symbols, pilot signals, preambles, symbols containing control information, etc. In addition, symbols containing control information may include information on the destination base station (ID that can identify the base station), information on the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0695] <Case A2> Figures 45A and 45B show an example of the configuration of a "frame group 4252_i including data symbols." Note that in Figures 45A and 45B, the horizontal axis represents time and the vertical axis represents frequency. For ease of explanation, it is assumed that terminal #1 of 902_1 is equipped with four transmission panel antennas: transmission panel antenna 1 of 106_1, transmission panel antenna 2 of 106_2, transmission panel antenna 3 of 106_3, and transmission panel antenna 4 of 106_4. In Figures 45A and 45B, similar to Figures 20A, 20B, 20C, 20D, 20E, and 20F, it is assumed that the "frame group 4252_i including data symbols" includes a first transmission interval, a second transmission interval, a third transmission interval, and a fourth transmission interval, and includes frequency bands ♭1, ♭2, ..., and ♭K.

[0696] 45A and 45B deal with frames (slots, modulated signals) transmitted by terminal #1 of 902_1. However, although not shown in FIGS. 45A and 45B, frames (slots, modulated signals) transmitted by terminals other than terminal #1 of 902_1 may also exist (see FIGS. 20A, 20B, 20C, 20D, 20E, and 20F).

[0697] In this example, in the frame group 4252_i containing data symbols, as shown in FIG. 45A, the "terminal #1 transmission frame (1) of 4511_11" transmitted by terminal #1 of 902_1 exists in the frequency band ♭K of the first transmission period, and as shown in FIG. 45B, the "terminal #1 transmission frame (2) of 4511_12" transmitted by terminal #1 of 902_1 exists in the frequency band ♭2 of the first transmission period.

[0698] For example, terminal #1 of 902_1 transmits to base station #1 of 901_1 "transmission frame (1) of terminal #1 of 4511_11" existing in frequency band ♭K of the first transmission interval as shown in Fig. 45A, and "transmission frame (2) of terminal #1 of 4511_12" existing in frequency band ♭2 of the first transmission interval as shown in Fig. 45B. At this time, "transmission frame (1) of terminal #1 of 4511_11" is transmitted from transmission panel antenna 1 of 106_1 of terminal #1 of 902_1, and "transmission frame (2) of terminal #1 of 4511_12" is transmitted from transmission panel antenna 2 of 106_2 of terminal #1 of 902_1.

[0699] In this way, the reason why "Terminal #1 transmission frame (1) of 4511_11" and "Terminal #1 transmission frame (2) of 4511_12" exist is because "Terminal #1 of 902_1 transmits two modulated signals (streams) to Base Station #1 of 901_1."

[0700] At this time, it is assumed that the "transmission frame (1) of terminal #1 of 4511_11" contains, for example, a data symbol (data, information) addressed to base station #1 of 901_1.

[0701] In addition, it is assumed that "transmission frame (2) of terminal #1 of 4511_12" also includes, for example, a data symbol (data, information) addressed to base station #1 of 901_1.

[0702] In the above example, as shown in Figures 45A and 45B, terminal #1 of 902_1 transmits "terminal #1 transmission frame (1) of 4511_11" and "terminal #1 transmission frame (2) of 4511_12" to base station #1 of 901_1, but terminal #1 of 902_1 may transmit three or more frames (slots, modulated signals) (multiple frames (slots, modulated signals) using multiple frequency resources) to base station #1 of 901_1. Also, terminal #1 of 902_1 may transmit one frame (slot, modulated signal) to base station #1 of 901_1.

[0703] In addition, in "terminal #1 transmission frame (1) of 4511_11" and "terminal #1 transmission frame (2) of 4511_12", in addition to data symbols, for example, "reference signals such as DMRS, PTRS, SRS", pilot symbols, pilot signals, preambles, symbols containing control information, etc. In addition, symbols containing control information may include information on the destination base station (ID that can identify the base station), the transmission method of the modulated signal, information on the modulation method, information on the error correction coding method (code length, coding rate, etc.), information on MCS, etc.

[0704] <Case A3> Figures 46A and 46B show an example of...

Claims

1. A circuit for generating a first signal and a second signal; a transmitter that transmits the first signal from a first panel antenna and transmits the second signal from a second panel antenna; A terminal comprising:

2. The first signal and the second signal are transmitted by space on the same resource. The terminal according to claim 1.

3. The same resource is instructed by a base station. The terminal according to claim 2.

4. The first signal and the second signal are transmitted through space on different frequencies. The terminal according to claim 1.

5. The first signal is transmitted by Orthogonal Frequency-Division Multiplexing (OFDM), The second signal is transmitted by Discrete Fourier Transform-Spread-OFDM (DFT-S-OFDM). The terminal according to claim 1.

6. The first signal and the second signal are transmitted separately to two transmitting and receiving points. The terminal according to claim 1.

7. The first signal is transmitted based on a first beam, the second signal is transmitted based on a second beam different from the first beam. The terminal according to claim 1.

8. Each of the first panel antenna and the second panel antenna is composed of one or more antennas. The terminal according to claim 1.

9. Generating a first signal and a second signal; transmitting the first signal from a first panel antenna and transmitting the second signal from a second panel antenna; Communication methods.

10. The first signal and the second signal are transmitted by space on the same resource. The communication method according to claim 9.

11. The same resources are indicated by a base station. The communication method according to claim 10.

12. The first signal and the second signal are transmitted by space on different frequencies. The communication method according to claim 9.

13. The method of claim 12, wherein the first signal is transmitted by Orthogonal Frequency-Division Multiplexing (OFDM); The second signal is transmitted by Discrete Fourier Transform-Spread-OFDM (DFT-S-OFDM). The communication method according to claim 9.

14. The first signal and the second signal are transmitted separately to two transmitting and receiving points. The communication method according to claim 9.

15. The method of claim 1, wherein the first signal is transmitted based on a first beam; the second signal is transmitted based on a second beam different from the first beam. The communication method according to claim 9.

16. Each of the first panel antenna and the second panel antenna is composed of one or more antennas. The communication method according to claim 9.

17. A generation circuit that controls generation of a first signal and a second signal; a transmitting circuit that controls transmission of the first signal from a first panel antenna and controls transmission of the second signal from a second panel antenna; 1. An integrated circuit comprising: