Base stations, communication methods, and integrated circuits

Abstract

This technology contributes to improving data transmission speed when multiple wireless communication devices are present. [Solution] The base station includes a receiving unit that receives a first signal transmitted from a first panel antenna or a second signal transmitted from a second panel antenna, based on a method selected from a first method in which a first signal and a second signal are mapped to different frequencies at the same time, a second method in which a first signal and a second signal are mapped to two frequencies that partially overlap at the same time, and a third method in which a first signal and a second signal are mapped to the same frequency at the same time, and a circuit that decodes the first signal or the second signal, wherein the first signal transmitted from the first panel antenna is transmitted in a first beam and positioned at the same time, and the second signal transmitted from the second panel antenna is transmitted in a second beam and transmits information about the first beam and information about the second beam to the terminal.

Description

Technical Field

[0001] The present disclosure relates to a base station, a communication method, and an integrated circuit.

Background Art

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

[0003] As a communication method for increasing the communication distance, there is a method described in Patent Document 1. FIG. 88 shows an example of the communication state of a wireless communication device described in Patent Document 1.

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

[0005] By following this procedure, the wireless communication device 001 determines a method of "transmission beamforming and / or reception beamforming", and the wireless communication device 051 also determines a method of "transmission beamforming and / or reception beamforming". Thereby, the communicable distance between the wireless communication device 001 and the wireless communication device 051 can be increased, but in an environment where a plurality of wireless communication devices exist, there remains a problem regarding improvement of the overall data transmission efficiency of the communication system constituted by the plurality of wireless communication devices.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

[0007] Non-limiting embodiments of this disclosure contribute to providing a technology for improving data transmission speed when multiple wireless communication devices are present.

[0008] A base station according to one aspect of the present disclosure includes a receiving unit that receives a first signal transmitted from a first panel antenna or a second signal transmitted from a second panel antenna, based on a method selected from a first method in which a first signal and a second signal are mapped at the same time on different frequencies, a second method in which the first signal and the second signal are mapped at the same time on two partially overlapping frequencies, and a third method in which the first signal and the second signal are mapped at the same time on the same frequency, and a circuit that decodes the first signal or the second signal, wherein the first signal transmitted from the first panel antenna is transmitted in a first beam and arranged at the same time, and the second signal transmitted from the second panel antenna is transmitted in a second beam, and transmits information about the first beam and information about the second beam to a terminal.

[0009] A communication method according to one aspect of the present disclosure receives a first signal transmitted from a first panel antenna or a second signal transmitted from a second panel antenna, based on a method selected from a first method in which a first signal and a second signal are mapped at the same time at different frequencies, a second method in which the first signal and the second signal are mapped at the same time to two partially overlapping frequencies, and a third method in which the first signal and the second signal are mapped at the same time to the same frequency, decodes the first signal or the second signal, transmits the first signal transmitted from the first panel antenna to a first beam and positioned at the same time, transmits the second signal transmitted from the second panel antenna to a second beam, and transmits information about the first beam and information about the second beam to a terminal.

[0010] An integrated circuit according to one aspect of the present disclosure controls the process of receiving a first signal transmitted from a first panel antenna or a second signal transmitted from a second panel antenna, and the process of decoding the first signal or the second signal, based on a method selected from a first method in which a first signal and a second signal are mapped at different frequencies at the same time, a second method in which the first signal and the second signal are mapped at two partially overlapping frequencies at the same time, and a third method in which the first signal and the second signal are mapped at the same frequency at the same time. The first signal transmitted from the first panel antenna is transmitted on a first beam and is arranged at the same time, the second signal transmitted from the second panel antenna is transmitted on a second beam, and transmits information about the first beam and information about the second beam to a terminal.

[0011] These comprehensive or specific embodiments may be implemented as systems, devices, methods, integrated circuits, computer programs, or recording media, or as any combination of systems, devices, methods, integrated circuits, computer programs, and recording media.

[0012] According to non-limiting embodiments of this disclosure, the data transmission speed is improved when there are multiple wireless communication devices.

[0013] Further advantages and effects of one aspect of this disclosure will be made apparent from the specification and drawings. Such advantages and / or effects are provided by several embodiments and features described in the specification and drawings, but not all of them are necessarily provided in order to obtain one or more identical features. [Brief explanation of the drawing]

[0014] [Figure 1A] A diagram showing an example of the configuration of the communication device in Embodiment 1. [Figure 1B] This figure shows a different configuration example of the communication device in Embodiment 1 from Figure 1A. [Figure 1C] Figure showing a configuration example different from FIGS. 1A and 1B of the communication device in Embodiment 1 [Figure 2] Figure showing a configuration example of the i-th transmission unit [Figure 3] Figure showing an example of the configuration of transmission panel antenna i in FIGS. 1A, 1B, and 1C [Figure 4] Figure showing an example of the configuration of reception panel antenna i in FIGS. 1A, 1B, and 1C [Figure 5] Figure showing a configuration example of a transmission device when using the OFDM method [Figure 6] Figure showing a configuration example of a reception device when using the OFDM method [Figure 7] Figure showing a configuration example of a reception device when using the single carrier method based on DFT [Figure 8] Figure showing a configuration example of a reception device when using the single carrier method based on the time domain [Figure 9] Figure showing an example of a communication state in Embodiment 1 [Figure 10] Figure showing an example of the modulation signal transmitted by base station #1 in FIG. 9 [Figure 11] Figure showing an example of the sector sweep reference signal of FIG. 10 transmitted by base station #1 of FIG. 9 having the configuration of FIGS. 1A, 1B, and 1C [Figure 12] Figure showing a configuration example of "sector sweep reference signal in transmission panel antenna i for frequency ♭p" in FIG. 11 [Figure 13] Figure showing an example of the operation in the time interval from time t1 to t2 which is the terminal response interval [Figure 14] Figure showing an example regarding the occupancy of a terminal in the transmission interval of the "sector sweep reference signal" for the terminal shown in FIG. 13 [Figure 15A] Figure showing an example of the configuration of the "sector sweep reference signal" of terminal #i [Figure 15B] Figure showing a configuration example of "sector sweep reference signal in terminal #i transmission panel antenna xi" in FIG. 15A [Figure 16A]A diagram showing an example of the configuration of a feedback signal transmitted by base station #1 that exists in the time interval from t2 to t3 in FIG. 10 [Figure 16B] A diagram showing an example of the assignment of specific feedback signals to the feedback signals shown in FIG. 16A [Figure 17A] A diagram showing an example of the configuration of a frame including data symbols transmitted by base station #1 that exists in the time interval from t4 to t5 in FIG. 10 [Figure 17B] A diagram showing an example of the assignment of specific modulation signals (slots) to the frame including data symbols shown in FIG. 17A [Figure 18] A diagram showing an example of the situation when base station #1 is communicating with "Terminal #1 to Terminal #6" [Figure 19] A diagram showing an example of the transmission status of the modulation signals of base station #1 and the transmission status of the modulation signals of terminals such as "Terminal #1 to Terminal #N" after FIG. 18 [Figure 20A] A diagram showing an example of the configuration of a "frame including data symbols" transmitted by Terminal #1 [Figure 20B] A diagram showing an example of the configuration of a "frame including data symbols" transmitted by Terminal #2 [Figure 20C] A diagram showing an example of the configuration of a "frame including data symbols" transmitted by Terminal #3 [Figure 20D] A diagram showing an example of the configuration of a "frame including data symbols" transmitted by Terminal #4 [Figure 20E] A diagram showing an example of the configuration of a "frame including data symbols" transmitted by Terminal #5 [Figure 20F] A diagram showing an example of the configuration of a "frame including data symbols" transmitted by Terminal #6 [Figure 21A] A diagram showing an example related to the occupancy of a terminal in the transmission interval of the "sector sweep reference signal for terminals" shown in FIG. 13, which is different from FIG. 14 [Figure 21B] A diagram showing an example related to the occupancy of a terminal in the transmission interval of the "sector sweep reference signal for terminals" shown in FIG. 13, which is different from FIG. 14 [Figure 22A]Diagram showing an example of terminal #3, "Reference signal for sectus sweep". [Figure 22B] Diagram showing another example of terminal #3, "Reference signal for sectus sweep". [Figure 23] This figure shows an example of operation during the time interval from time t1 to t2, which is the terminal response interval. [Figure 24] Figure 23 shows an example of terminal occupation in the transmission section of the terminal's "Sectus Sweep Reference Signal". [Figure 25] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminals such as terminal #1 to terminal #6. [Figure 26] This figure shows an example of terminal occupation in the transmission section of the "Secta Sweep Reference Signal" for terminals, as shown in Figure 23, which differs from Figure 24. [Figure 27] Figure 9 shows an example of a modulated signal transmitted by base station #1. [Figure 28A] Figure 27 shows a first example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3 in Figure 27. [Figure 28B] Figure 27 shows a first example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3 in Figure 27. [Figure 29A] Figure 27 shows a first example of the structure of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 29B] Figure 27 shows a first example of the structure of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 30A] Figure 27 shows a second example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3 in Figure 27. [Figure 30B] Figure 27 shows a second example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3 in Figure 27. [Figure 31A]Figure 27 shows a second example of the structure of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 31B] Figure 27 shows a second example of the structure of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 32A] Figure 27 shows a third example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3 in Figure 27. [Figure 32B] Figure 27 shows a third example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3 in Figure 27. [Figure 33A] Figure 27 shows a third example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 33B] Figure 27 shows a third example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 34A] Figure 27 shows a fourth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 34B] Figure 27 shows a fourth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 35A] Figure 27 shows a fourth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 35B] Figure 27 shows a fourth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 36] Figure 27 shows a fifth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 37] Figure 27 shows a fifth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 38] Figure 27 shows a sixth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 39] Figure 27 shows a sixth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 40] Figure 27 shows a seventh example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 41] Figure 27 shows a seventh example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 42] Figure 9 shows an example of a situation when base station #1 and "terminal #1 or other terminals" are communicating. [Figure 43] Figures 42 onwards show examples of the transmission status of modulated signals from base station #1 and terminals such as "terminal #1". [Figure 44A] This diagram shows the first example of the structure of a "frame group containing data symbols". [Figure 44B] This diagram shows the first example of the structure of a "frame group containing data symbols". [Figure 45A] This diagram shows a second example of the configuration of a "frame group containing data symbols." [Figure 45B] This diagram shows a second example of the configuration of a "frame group containing data symbols." [Figure 46A] This diagram shows a third example of the configuration of a "frame group containing data symbols." [Figure 46B] This diagram shows a third example of the configuration of a "frame group containing data symbols." [Figure 47A] This figure shows a fourth example of the configuration of a "frame group containing data symbols". [Figure 47B] This figure shows a fourth example of the configuration of a "frame group containing data symbols". [Figure 48] Figure 5 shows an example of the configuration of a "frame group containing data symbols". [Figure 49] Figure 6 shows an example of the configuration of a "frame group containing data symbols". [Figure 50] Figure 7 shows an example of the configuration of a "frame group containing data symbols". [Figure 51A] Figure 8 shows an example of the configuration of a "frame group containing data symbols". [Figure 51B] Figure 8 shows an example of the configuration of a "frame group containing data symbols". [Figure 52A] Figure 9 shows an example of the configuration of a "frame group containing data symbols". [Figure 52B] Figure 9 shows an example of the configuration of a "frame group containing data symbols". [Figure 53] This figure shows the tenth example of the configuration of a "frame group containing data symbols". [Figure 54] This diagram shows an example of the configuration of a reference signal for secta sweep transmitted by a base station. [Figure 55] Figure 54 shows an example of the configuration of the "reference signal for a sect sweep at frequency ♭p". [Figure 56] Figure 14 shows an example of the configuration of terminal #i, "Reference signal for sectus sweep." [Figure 57] Figure 24 shows an example of the configuration of a reference signal for sect sweeping. [Figure 58] This figure shows an example of operation during the time interval from time t1 to t2, which is the terminal response interval. [Figure 59A] Figure 58 shows an example of the time-frequency configuration of the terminal's "Secta Sweep Reference Signal". [Figure 59B] Figure 59A shows an example of terminal occupation in the "Secta Sweep Reference Signal" for terminals. [Figure 60A] Figure 10 shows an example of the configuration of the feedback signal transmitted by base station #1 during the time interval from t2 to t3. [Figure 60B] Figure 60A shows an example of a specific feedback signal assignment for the feedback signal shown. [Figure 61A]Figure 10 shows an example of the structure of a frame containing data symbols transmitted by base station #1 during the time interval from t4 to t5. [Figure 61B] Figure 61A shows an example of a specific modulation signal (slot) assignment for a frame containing data symbols. [Figure 62A] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #1. [Figure 62B] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #2. [Figure 62C] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #3. [Figure 62D] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #4. [Figure 62E] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #5. [Figure 62F] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #6. [Figure 63A] This figure shows an example of terminal occupation in the "Secta Sweep Reference Signal" for terminals shown in Figure 59A, which is different from Figure 59B. [Figure 63B] This figure shows an example of terminal occupation in the "Secta Sweep Reference Signal" for terminals shown in Figure 59A, which is different from Figure 59B. [Figure 64A] Figure 27 shows an eighth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 64B] Figure 27 shows an eighth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 65A] Figure 27 shows an eighth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 65B] Figure 27 shows an eighth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 66A] Figure 27 shows a ninth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 66B] Figure 27 shows a ninth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3. [Figure 67A] Figure 27 shows a ninth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5. [Figure 67B] Figure 27 shows a ninth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5. [Figure 68] Figure 27 shows a tenth example of the configuration of the feedback signal group transmitted by base station #1 in the time interval from t2 to t3 in Figure 27. [Figure 69] Figure 27 shows a tenth example of the configuration of a group of frames containing data symbols transmitted by base station #1, existing in the time interval from t4 to t5 in Figure 27. [Figure 70A] Figure 11 shows an example of the configuration of a "frame group containing data symbols". [Figure 70B] Figure 11 shows an example of the configuration of a "frame group containing data symbols". [Figure 71A] Figure 12 shows an example of the configuration of a "frame group containing data symbols". [Figure 71B] Figure 12 shows an example of the configuration of a "frame group containing data symbols". [Figure 72] This figure shows the 13th example of the configuration of a "frame group containing data symbols". [Figure 73] Figure 10 shows an example of a reference signal for a sector sweep transmitted by base station #1 in Figure 9, which has the configurations shown in Figures 1A, 1B, and 1C. [Figure 74] Figure 73 shows an example configuration of the "reference signal for sect sweep in the transmitting panel antenna X for frequency $X". [Figure 75]Figure 74 shows an example configuration of the "reference signal for sector sweep in the transmitting panel antenna X for frequency $X_i". [Figure 76] Diagram showing an example of the relationship between a base station and a terminal. [Figure 77A] Figure 13 shows an example of terminal occupation in the transmission section of the terminal's "Sectus Sweep Reference Signal". [Figure 77B] Figure 13 shows an example of terminal occupation in the transmission section of the terminal's "Sectus Sweep Reference Signal". [Figure 78A] Figure 10 shows an example of the configuration of the feedback signal transmitted by base station #1 during the time interval from t2 to t3. [Figure 78B] Figure 78A shows an example of the configuration of the transmission section for the feedback signal in the transmitting panel antenna X for frequency $X. [Figure 78C] Figures 78A and 78B show examples of specific feedback signal assignments to the feedback signals shown. [Figure 78D] Figures 78A and 78B show examples of specific feedback signal assignments to the feedback signals shown. [Figure 79A] Figure 10 shows an example of the structure of a frame containing data symbols transmitted by base station #1 during the time interval from t4 to t5. [Figure 79B] Figure 79A shows an example of the configuration of the transmission section of the modulated signal (slot) in the transmitting panel antenna X for frequency $X. [Figure 79C] Figures 79A and 79B show examples of specific modulation signal (slot) assignments for frames containing data symbols. [Figure 79D] Figures 79A and 79B show examples of specific modulation signal (slot) assignments for frames containing data symbols. [Figure 80A] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #1. [Figure 80B] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #2. [Figure 80C] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #3. [Figure 80D] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #4. [Figure 80E] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #5. [Figure 80F] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #6. [Figure 81A] This figure shows an example of terminal occupation in the transmission section of the terminal-specific "secta sweep reference signal" shown in Figure 13, which is different from Figure 77A. [Figure 81B] This figure shows an example of terminal occupation in the transmission section of the terminal-specific "secta sweep reference signal" shown in Figure 13, which is different from Figure 77A. [Figure 82A] Figure 58 shows an example of the time-frequency configuration of the terminal's "Secta Sweep Reference Signal". [Figure 82B] Figure 82A shows an example of terminal occupation in the "Sectus Sweep Reference Signal" for terminals. [Figure 83A] Figure 58 shows an example of the time-frequency configuration of the terminal's "Secta Sweep Reference Signal". [Figure 83B] Figure 83A shows an example of terminal occupation in the "Sectus Sweep Reference Signal" for terminals. [Figure 84A] Figure 10 shows an example of the configuration of the feedback signal transmitted by base station #1 during the time interval from t2 to t3. [Figure 84B] Figure 84A shows an example of the configuration of the "feedback signal in the transmitting panel antenna X for frequency $X". [Figure 84C] Figures 84A and 84B show examples of specific feedback signal assignments to the feedback signals shown. [Figure 84D]Figures 84A and 84B show examples of specific feedback signal assignments to the feedback signals shown. [Figure 85A] Figure 10 shows an example of the structure of a frame containing data symbols transmitted by base station #1 during the time interval from t4 to t5. [Figure 85B] Figure 85A shows an example of the configuration of the "modulation signal (slot) in the transmitting panel antenna X for frequency $X". [Figure 85C] Figures 85A and 85B show examples of specific modulation signal (slot) assignments for frames containing data symbols. [Figure 85D] Figures 85A and 85B show examples of specific modulation signal (slot) assignments for frames containing data symbols. [Figure 86A] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #1. [Figure 86B] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #2. [Figure 86C] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #3. [Figure 86D] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #4. [Figure 86E] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #5. [Figure 86F] This diagram shows an example of the structure of a "frame containing data symbols" transmitted by terminal #6. [Figure 87A] This figure shows an example of terminal occupation in the "Sectus Sweep Reference Signal" for terminals shown in Figure 58, which is different from Figure 82B. [Figure 87B] This figure shows an example of terminal occupation in the "Sectus Sweep Reference Signal" for terminals shown in Figure 58, which is different from Figure 82B. [Figure 88] A diagram showing an example of the communication state of a conventional wireless communication device. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0016] (Embodiment 1) The communication system, communication device, and communication method of this first embodiment will be described in detail below.

[0017] Figure 1A shows an example of the configuration of communication equipment such as a base station, access point, terminal, and repeater in this embodiment 1.

[0018] The communication device in Figure 1A comprises N transmitting units, from the first transmitting unit 102_1 to the Nth transmitting unit 102_N. N is an integer greater than or equal to 1 or greater than or equal to 2.

[0019] Furthermore, the communication device in Figure 1A shall be equipped with M transmitting panel antennas, ranging from "transmitting panel antenna 1 of 106_1 to transmitting panel antenna M of 106_M". M shall be an integer of 1 or more, or an integer of 2 or more.

[0020] The communication device in Figure 1A shall be equipped with n receiving units, from the first receiving unit 155_1 to the nth receiving unit 155_n. Hereinafter, n shall be an integer of 1 or more, or an integer of 2 or more.

[0021] The communication device in Figure 1A shall be equipped with m receiving panel antennas, ranging from "receiving panel antenna 1 of 151_1 to receiving panel antenna m of 151_m". m shall be an integer of 1 or more, or an integer of 2 or more.

[0022] The i-th transmission unit 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 using a modulation scheme, and outputs the i-th modulated signal 103_i. Note that i is an integer between 1 and N.

[0023] Note that the i-th data 101_i may contain data from one or more users. In this case, error correction codes, modulation schemes, and transmission methods may be set for each user.

[0024] The first processing unit 104 receives the i-th modulation signal 103_i (where i is an integer between 1 and N), the control signal 100, and the reference signal 199 as inputs, and outputs the j-th transmission signal 105_j (where j is an integer between 1 and M) based on the frame configuration information contained in the control signal 100. Note that the i-th modulation signal 103_i may contain signals that do not exist, and the j-th transmission signal 105_j may contain signals that do not exist.

[0025] The j-th transmission signal 105_j is then output as a radio wave from the 106_j transmission panel antenna j. The 106_j transmission panel antenna j may also be beamformed and its transmission directivity changed by receiving the control signal 100 as input. Furthermore, the 106_j transmission panel antenna j may be switched when transmitting a modulated signal to the communication partner using the control signal 100. This will be explained later.

[0026] The i-th received signal 152_i is received by the receiving panel antenna i of 151_i. Note that the receiving panel antenna i of 151_i may also be beamformed by inputting control signal 100 to change its receiving directivity. This will be explained later.

[0027] The second processing unit 153 receives the i-th received signal 152_i and the control signal 100 as input, performs processing such as frequency conversion, and outputs the j-th signal after signal processing 154_j. Note that the i-th received signal 152_i may contain signals that do not exist, and the j-th signal after signal processing 154_j may contain signals that do not exist.

[0028] The j-th receiving unit 155_j receives the j-th signal processed signal 154_j and the control signal 100 as inputs. Based on the control signal 100, it performs demodulation and error correction decoding on the j-th signal processed signal 154_j and outputs the j-th control data 156_j and the j-th data 157_j.

[0029] Furthermore, the j-th control data 156_j may contain control data for one or more users. Also, the j-th data 157_j may contain data for one or more users.

[0030] The third processing unit 158 ​​takes the j-th control data 156_j as input and generates and outputs a control signal 100 based on information obtained from the communication partner.

[0031] Furthermore, the first processing unit 104 of the communication device in Figure 1A may perform processing for transmit beamforming (transmit directivity control), such as precoding. Also, the second processing unit 153 may perform processing for receive directivity control. As another example, the first processing unit 104 may perform processing such as converting the first transmit signal 105_1 into the first modulated signal 103_1, the second transmit signal 105_2 into the second modulated signal 103_2, and the third transmit signal 105_3 into the third modulated signal 103_3 and outputting them. Alternatively, the first processing unit 104 may perform processing such as converting the first transmit signal 105_1 into the second modulated signal 103_2 and outputting it. Furthermore, the second processing unit 153 may perform processing such that the signal 154_1 after the first signal processing is used as the first received signal 152_1, the signal 154_2 after the second signal processing is used as the second received signal 152_2, and the signal 154_3 after the third signal processing is used as the third received signal 152_3, and output these signals. Alternatively, the second processing unit 153 may perform processing such that the signal 154_2 after the second signal processing is used as the first received signal 152_1 and output these signals.

[0032] In Figure 1A, the configuration may include additional processing units not shown in Figure 1A. For example, the communication device may include an interleaver for rearranging symbols and / or data, and a padding unit for padding. Furthermore, the communication device in Figure 1A (and Figures 1B and 1C) may perform transmission and / or reception that supports MIMO (Multiple Input Multiple Output) transmission, which transmits multiple modulated signals (multiple streams) using multiple antennas. In addition, the communication device in Figure 1A (and Figures 1B and 1C) may perform transmission that supports multi-user MIMO transmission, which transmits modulated signals to at least multiple terminals in a first time interval using a first frequency (band).

[0033] Figure 1B shows a different configuration example of communication equipment such as base stations, access points, terminals, and repeaters in this embodiment 1 compared to Figure 1A. In Figure 1B, components that operate similarly to those in Figure 1A are given the same numbers, and detailed explanations are omitted.

[0034] A distinctive feature of Figure 1B is 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 output the x-th transmit signal 105_x as the y-th modulated signal 103_y. Note that x is an integer between 1 and M, and y is an integer between 1 and M.

[0035] Furthermore, the number of receiving units and the number of receiving panel antennas are assumed to be the same. In this case, the second processing unit 153 may perform processing for receiving directivity control. The second processing unit 153 may also output the signal 154_x after processing the x-th signal as the y-th received signal 152_y. Note that x is an integer between 1 and m, and y is an integer between 1 and m.

[0036] Figure 1C shows a configuration example of communication equipment such as base stations, access points, terminals, and repeaters in this embodiment 1, which differs from those in Figures 1A and 1B. In Figure 1C, components that operate similarly to those in Figure 1A are given the same numbers, and detailed explanations are omitted.

[0037] A distinctive feature of Figure 1C is that the number of transmitting units and transmitting panel antennas are the same, and there is no first processing unit. Also, the number of receiving units and receiving panel antennas are the same, and there is no second processing unit.

[0038] Figures 1A, 1B, and 1C show examples of the configuration of communication equipment such as base stations, access points, terminals, and repeaters, but the configuration of communication equipment is not limited to these examples.

[0039] Figure 2 shows an example configuration of the i-th transmission unit 102_i. Note that 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.

[0040] The data symbol generation unit 202 takes data 201 and control signal 200 as input and performs error correction coding, mapping, and signal processing for transmission based on information contained in the control signal 200, such as information on the error correction coding method, modulation scheme, transmission method, and frame configuration method, and outputs a modulated signal 203 of the data symbol. Note that data 201 corresponds to the i-th data 101_i, and control signal 200 corresponds to control signal 100. Therefore, data 201 may contain data from one or more users.

[0041] The secta sweep reference signal generation unit 204 receives the control signal 200 as input and generates and outputs a secta sweep reference signal 205 based on the frame configuration information contained in the control signal 200. The specific configuration method and transmission method of the secta sweep reference signal 205 will be explained in detail later.

[0042] The other signal generation unit 206 takes the control signal 200 as input and generates and outputs other signals 207 based on the control signal.

[0043] The processing unit 251 receives the data symbol modulation signal 203, the sector sweep reference signal 205, other signals 207, and the control signal 200 as inputs, and generates and outputs a modulation signal 252 according to the frame configuration based on the frame configuration information contained in the control signal 200. The modulation signal 252 according to the frame configuration corresponds to the i-th modulation signal 103_i. A specific example of the frame configuration will be explained in detail later.

[0044] Figure 3 shows an example of the configuration of the transmitting panel antenna i of 106_i in Figures 1A, 1B, and 1C. Note that i is an integer between 1 and M. The distribution unit 302 takes the transmitting signal 301 as input, distributes it, and outputs the first transmitting signal 303_1, the second transmitting signal 303_2, the third transmitting signal 303_3, and the fourth transmitting signal 303_4. Note that the transmitting signal 301 corresponds to the ith transmitting signal 105_i in Figures 1A and 1B, or the ith modulated signal 103_i in Figure 1C.

[0045] The multiplication unit 304_1 receives the first transmission signal 303_1 and the control signal 300 as inputs. Based on the control signal 300, it multiplies the first transmission signal 303_1 by a multiplication coefficient to generate and output the first transmission signal 305_1 after coefficient multiplication. The first transmission signal 305_1 after coefficient multiplication is then output as radio waves from the antenna 306_1. The control signal 300 corresponds to the control signal 100.

[0046] Let's explain in detail. Let the first transmitted signal 303_1 be represented as tx1(t), where t is time. If the multiplication coefficient is w1, then the first transmitted signal 305_1 after multiplication can be expressed as tx1(t) × w1. Note that tx1(t) can be expressed as a complex number and therefore may be a real number. Similarly, w1 can be expressed as a complex number and therefore may be a real number.

[0047] The multiplication unit 304_2 receives the second transmission signal 303_2 and the control signal 300 as inputs. Based on the control signal 300, it multiplies the second transmission signal 303_2 by a multiplication coefficient to generate and output the second transmission signal 305_2 after coefficient multiplication. The second transmission signal 305_2 after coefficient multiplication is then output as radio waves from the antenna 306_2.

[0048] Let's explain in detail. Let the second transmitted signal 303_2 be represented as tx2(t), where t is time. If the multiplication coefficient is w2, then the second transmitted signal 305_2 after multiplication can be expressed as tx2(t) × w2. Note that tx2(t) can be expressed as a complex number and therefore may be a real number. Similarly, w2 can be expressed as a complex number and therefore may be a real number.

[0049] The multiplication unit 304_3 receives the third transmission signal 303_3 and the control signal 300 as inputs. Based on the control signal 300, it multiplies the third transmission signal 303_3 by a multiplication coefficient to generate and output the third transmission signal 305_3 after coefficient multiplication. The third transmission signal 305_3 after coefficient multiplication is then output as radio waves from the antenna 306_3.

[0050] Let's explain in detail. Let the third transmission signal 303_3 be represented as tx3(t), where t is time. If the multiplication coefficient is w3, then the third transmission signal 305_3 after multiplication can be expressed as tx3(t) × w3. Note that tx3(t) can be expressed as a complex number and therefore may be a real number. Similarly, w3 can be expressed as a complex number and therefore may be a real number.

[0051] The multiplication unit 304_4 receives the fourth transmission signal 303_4 and the control signal 300 as inputs. Based on the control signal 300, it multiplies the fourth transmission signal 303_4 by a multiplication coefficient to generate and output the fourth transmission signal 305_4 after coefficient multiplication. The fourth transmission signal 305_4 after coefficient multiplication is then output as radio waves from the antenna 306_4.

[0052] Let's explain in detail. Let the fourth transmission signal 303_4 be represented as tx4(t), where t is time. If the multiplication coefficient is w4, then the fourth transmission signal 305_4 after multiplication can be expressed as tx4(t) × w4. Note that tx4(t) can be expressed as a complex number and therefore may be a real number. Similarly, w4 can be expressed as a complex number and therefore may be a real number.

[0053] Note that the absolute values ​​of w1, w2, w3, and w4 may also be equal. In this case, a phase change has occurred. Naturally, the absolute values ​​of w1, w2, w3, and w4 do not have to be equal.

[0054] The values ​​of w1, w2, w3, and w4 can be switched per frame, per slot, per mini-slot, per multiple symbol, or per symbol. The timing of switching the values ​​of w1, w2, w3, and w4 is not limited to the examples above.

[0055] Furthermore, while Figure 3 illustrates a transmitting panel antenna consisting of four antennas (and four multipliers), the number of antennas is not limited to four; it can consist of two or more antennas.

[0056] In addition, the transmitting panel antenna i of 106_i in Figures 1A, 1B, and 1C may be controlled by changing the characteristics of the antenna itself, and in this case, the transmitting panel antenna i of 106_i only needs to be composed of one or more antennas.

[0057] Figure 4 shows an example of the configuration of the receiving panel antenna i of 151_i in Figures 1A, 1B, and 1C. Note that i is an integer between 1 and m.

[0058] The multiplication unit 403_1 receives the first received signal 402_1 and the control signal 400 received by the antenna 401_1 as inputs. Based on the control signal 400, it multiplies the first received signal 402_1 by a multiplication coefficient and outputs the first received signal 404_1 after multiplication by the coefficient.

[0059] Let's explain in detail. Let the first received signal 402_1 be represented as rx1(t), where t is time. If the multiplication coefficient is d1, then the first received signal 404_1 after multiplication can be expressed as rx1(t) × d1. Note that rx1(t) can be expressed as a complex number and therefore may be a real number. Similarly, d1 can be expressed as a complex number and therefore may be a real number.

[0060] The multiplication unit 403_2 receives the second received signal 402_2 and the control signal 400 received by the antenna 401_2 as inputs. Based on the control signal 400, it multiplies the second received signal 402_2 by a multiplication coefficient and outputs the second received signal 404_2 after multiplication by the coefficient.

[0061] Let's explain this in detail. Let the second received signal 402_2 be represented as rx2(t), where t is time. If the multiplication coefficient is d2, then the second received signal 404_2 after multiplication can be expressed as rx2(t) × d2. Note that rx2(t) can be expressed as a complex number and therefore may be a real number. Similarly, d2 can be expressed as a complex number and therefore may be a real number.

[0062] The multiplication unit 403_3 receives the third received signal 402_3 and the control signal 400 from the antenna 401_3 as inputs. Based on the control signal 400, it multiplies the third received signal 402_3 by a multiplication coefficient and outputs the third received signal 404_3 after multiplication by the coefficient.

[0063] Let's explain in detail. Let the third received signal 402_3 be represented as rx3(t), where t is time. If the multiplication coefficient is d3, then the third received signal 404_3 after multiplication can be expressed as rx3(t) × d3. Note that rx3(t) can be expressed as a complex number and therefore may be a real number. Similarly, d3 can be expressed as a complex number and therefore may be a real number.

[0064] The multiplication unit 403_4 receives the fourth received signal 402_4 and the control signal 400 from the antenna 401_4 as inputs. Based on the control signal 400, it multiplies the fourth received signal 402_4 by a multiplication coefficient and outputs the fourth received signal 404_4 after multiplication by the coefficient.

[0065] Let's explain in detail. Let the fourth received signal 402_4 be represented as rx4(t), where t is time. If the multiplication coefficient is d4, then the fourth received signal 404_4 after multiplication can be expressed as rx4(t) × d4. Note that rx4(t) can be expressed as a complex number and therefore may be a real number. Similarly, d4 can be expressed as a complex number and therefore may be a real number.

[0066] The coupling / combining unit 405 takes the first received signal 404_1, the second received signal 404_2, the third received signal 404_3, and the fourth received signal 404_4 after coefficient multiplication as input, combines the first received signal 404_1, the second received signal 404_2, the third received signal 404_3, and the fourth received signal 404_4 after coefficient multiplication, and outputs the modulated signal 406. The modulated signal 406 is expressed as rx1(t)×d1+rx2(t)×d2+rx3(t)×d3+rx4(t)×d4.

[0067] Furthermore, control signal 400 corresponds to control signal 100. And modulated signal 406 corresponds to the i-th received signal of 152_i.

[0068] Furthermore, the absolute values ​​of d1, d2, d3, and d4 may be equal. In this case, it corresponds to a phase change having occurred. Naturally, the absolute values ​​of d1, d2, d3, and d4 do not have to be equal.

[0069] The values ​​of d1, d2, d3, and d4 can be switched per frame, per slot, per mini-slot, per multiple symbol, or per symbol. The timing of switching the values ​​of d1, d2, d3, and d4 is not limited to the examples above.

[0070] Furthermore, while Figure 4 illustrates a receiving panel antenna consisting of four antennas (and four multipliers), the number of antennas is not limited to four; it can consist of two or more antennas.

[0071] In addition, the receiving panel antenna i of 151_i in Figures 1A, 1B, and 1C may be controlled by changing the characteristics of the antenna itself, and in this case, the receiving panel antenna i of 151_i only needs to be composed of one or more antennas.

[0072] In this embodiment, Figures 1A, 1B, and 1C represent, for example, communication devices for a base station and a gNB (g Node B), and are assumed to support multi-carrier transmission such as OFDM (Orthogonal Frequency Division Multiplexing) transmission. Furthermore, the base station and gNB in ​​Figures 1A, 1B, and 1C may also support OFDMA (Orthogonal Frequency Division Multiple Access).

[0073] Figure 5 shows an example of the configuration of a transmitter using the OFDM method. As shown in Figure 5, the transmitter is composed of, for example, a constellation mapper 501, a serial-to-parallel converter 502, and an IFFT (Inverse Fast Fourier Transform) 503.

[0074] The constellation mapper 501, for example, takes data as input, performs mapping based on a set modulation scheme, and outputs a modulated signal.

[0075] The serial-to-parallel converter 502 converts a serial signal to a parallel signal. However, if a parallel signal is already available, the serial-to-parallel converter 502 may not be necessary.

[0076] The IFFT503 processes the input signal using an IFFT and outputs a modulated signal based on the OFDM method. Alternatively, the IFFT503 may also function as an inverse Fourier transform unit, performing an inverse Fourier transform.

[0077] When using the OFDM method, the transmitting device may also contain other processing units, such as an error correction coding unit or an interleaver, and is not limited to the configuration shown in Figure 5.

[0078] In this embodiment, Figures 1A, 1B, and 1C may, for example, support reception of multi-carrier transmission such as OFDM transmission, or support reception of single-carrier systems such as single-carrier systems based on DFT (Discrete Fourier Transform), in the case of a base station or gNB communication equipment. Below, an example of the configuration of the single-carrier reception section will be described.

[0079] Figure 6 shows an example of the configuration of a receiver when using the OFDM method. As shown in Figure 6, the receiver when using the OFDM method is composed of a receiver FE processing unit (Rx(Receiver)FE (Front End) processing) 601, an FFT (Fast Fourier Transform) 602, a parallel-to-serial conversion unit 603, and a demapper 604.

[0080] The Rx FE processing unit 601 performs processing on the receiving front end.

[0081] The FFT602 applies the FFT process to the input signal.

[0082] The parallel-to-serial converter 603 converts a parallel signal into a serial signal. However, if a serial signal is already available, the parallel-to-serial converter 603 may not be necessary.

[0083] Demapper 604 will perform demodulation processing based on the transmission method and modulation scheme.

[0084] The receiving device may also include other processing units, such as a deinterleaver or an error correction code decoding unit, and is not limited to the configuration shown in Figure 6.

[0085] Figure 7 shows an example of the configuration of a receiver when using a single-carrier scheme based on DFT. As shown in Figure 7, the receiver is composed of a receiver 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. Other processing units may also be present in the receiver.

[0086] Figure 8 shows an example of the configuration of a receiver when using a time-domain-based single-carrier scheme. As shown in Figure 8, the receiver is composed of a receiver 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 a demapper 805. Other processing units may also be present in the receiver.

[0087] The above describes examples of single-carrier receiving methods and receiving equipment configurations, but these are not the only examples of single-carrier receiving methods and equipment. For example, examples of single-carrier methods include "DFT (Discrete Fourier Transform)-Spread OFDM (Orthogonal Frequency Division Multiplexing)" (DFT-S OFDM), "Trajectory Constrained DFT-Spread OFDM," "Constrained DFT-Spread OFDM" (Constrained DFT-S OFDM), "OFDM based SC (Single Carrier)," "SC (Single Carrier)-FDMA (Frequency Division Multiple Access)," "Guard interval DFT-Spread OFDM," and time-domain implementation single-carrier methods (e.g., SC (Single Carrier)-QAM).

[0088] Figure 9 shows an example of the communication state in this embodiment 1. As shown in Figure 9, consider the 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 the base station and the terminals is not limited to this example; for example, a base station may communicate with one or more terminals.

[0089] The following explanation will describe an example where the base station uses the OFDMA method to transmit a modulated signal to the terminal.

[0090] Figure 10 shows an example of the modulated signal 1000 transmitted by base station #1 of 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.

[0091] The time interval from time t1 to t2 is the terminal response interval. The terminal response will be explained later.

[0092] A feedback signal 1002 exists during the time interval from time t2 to t3. The feedback signal 1002 will be explained later.

[0093] Frame 1003, which contains data symbols, exists in the time interval from time t4 to t5. Frame 1003, which contains data symbols, will be explained later.

[0094] In Figure 10, the reference signal 1001 for sectus sweep is used, but this is not the only name it can be called. It may also be called a reference signal, reference symbol, training signal, training symbol, reference signal, reference symbol, etc. Similarly, the feedback signal 1002 is used, but this is not the only name it can be called. It may also be called a feedback symbol, signal to the terminal, symbol to the terminal, control signal, control symbol, etc. Finally, the frame 1003 containing data symbols is used, but this is not the only name it can be called. It may also be called a frame containing slots, minislots, units, etc.

[0095] Figure 11 shows an example of the reference signal 1001 for a sector sweep in Figure 10 transmitted by base station #1 of 901_1 in Figure 9, which has the configuration of Figures 1A, 1B, and 1C. In Figure 11, the horizontal axis represents time and the vertical axis represents frequency. In the example in Figure 11, base station #1 of 901_1 transmits a modulated signal based on OFDMA, and is therefore divided into frequency bands ♭1, ♭2, ..., and ♭K, as shown in Figure 11. K is an integer of 1 or more, or an integer of 2 or more. For example, when using OFDM(A), one frequency band contains one or more (sub)carriers, or two or more (sub)carriers. This may be the same in other drawings and other embodiments.

[0096] For example, in frequency band ♭1, the first time interval contains the sectus sweep reference signal 1101_11 for the transmitting panel antenna 1 for frequency ♭1, the second time interval contains the sectus sweep reference signal 1101_12 for the transmitting panel antenna 2 for frequency ♭1, ..., and the M time interval contains the sectus sweep reference signal 1101_1M for the transmitting panel antenna M for frequency ♭1.

[0097] Therefore, in the frequency band ♭i, the first time interval contains the sectus sweep reference signal 1101_i1 for the transmitting panel antenna 1 for frequency ♭i, the second time interval contains the sectus sweep reference signals 1101_i2, ... for the transmitting panel antenna 2 for frequency ♭i, and the M time interval contains the sectus sweep reference signal 1101_iM for the transmitting panel antenna M for frequency ♭i. Note that i is an integer between 1 and K, inclusive.

[0098] The reference signal 1101_ij for the sectus sweep at the transmitting panel antenna j for frequency ♭i will be transmitted from the transmitting panel antenna j of base station #1 of 901_1, which has the configurations shown in Figures 1A, 1B, and 1C. In this case, j will be an integer between 1 and M, inclusive.

[0099] One notable feature in Figure 11 is that, in the i-th time interval, the reference signal for the sectus sweep is transmitted from the same transmitting panel antenna, regardless of the frequency band. In this case, the same beamforming parameters are used in the first time period, regardless of the frequency band. Beamforming will be explained later.

[0100] Figure 12 shows an example configuration of the "reference signal 1101_pi for sectus sweep in the transmitting panel antenna i for frequency ♭p" shown in Figure 11. In Figure 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.

[0101] For example, suppose that base station #1 of 901_1, having the configurations shown in Figures 1A, 1B, and 1C, has the configuration shown in Figure 3 as the transmitting panel antenna i of 106_i.

[0102] This section describes "Reference signal 1201_1 using the first parameter in the transmitting panel antenna i for frequency ♭p".

[0103] When base station #1 of 901_1 transmits the "reference signal 1201_1 with the first parameter at the transmitting panel antenna i for frequency ♭p" shown in Figure 12, base station #1 of 901_1 sets the multiplication coefficient in the multiplication unit 304_1 at the transmitting panel antenna i of 106_i to w1(i,1). If the first transmitting signal 303_1 in the "reference signal 1201_1 with the first parameter at the transmitting panel antenna i for frequency ♭p" is tx1ref1(t), then the multiplication unit 304_1 obtains tx1ref1(t) × w1(i,1). Then, base station #1 of 901_1 transmits tx1ref1(t) × w1(i,1) from antenna 306_1 in Figure 3. Note that t is time.

[0104] When base station #1 of 901_1 transmits the "reference signal 1201_1 with the first parameter at the transmitting panel antenna i for frequency ♭p" shown in Figure 12, base station #1 of 901_1 sets the multiplication coefficient in the multiplication unit 304_2 at the transmitting panel antenna i of 106_i to w2(i,1). If the second transmitting signal 303_2 in the "reference signal 1201_1 with the first parameter at the transmitting panel antenna i for frequency ♭p" is tx2ref1(t), then the multiplication unit 304_2 obtains tx2ref1(t) × w2(i,1). Then, base station #1 of 901_1 transmits tx2ref1(t) × w2(i,1) from antenna 306_2 shown in Figure 3.

[0105] When base station #1 of 901_1 transmits the "reference signal 1201_1 with the first parameter at the transmitting panel antenna i for frequency ♭p" shown in Figure 12, base station #1 of 901_1 sets the multiplication coefficient in the multiplication unit 304_3 at the transmitting panel antenna i of 106_i to w3(i,1). If the third transmitting signal 303_3 in the "reference signal 1201_1 with the first parameter at the transmitting panel antenna i for frequency ♭p" is tx3ref1(t), then the multiplication unit 304_3 obtains tx3ref1(t) × w3(i,1). Then, base station #1 of 901_1 transmits tx3ref1(t) × w3(i,1) from antenna 306_3 shown in Figure 3.

[0106] When base station #1 of 901_1 transmits the "reference signal 1201_1 with the first parameter at the transmitting panel antenna i for frequency ♭p" shown in Figure 12, base station #1 of 901_1 sets the multiplication coefficient in the multiplication unit 304_4 at the transmitting panel antenna i of 106_i to w4(i,1). If the fourth transmitting signal 303_4 in the "reference signal 1201_1 with the first parameter at the transmitting panel antenna i for frequency ♭p" is tx4ref1(t), then the multiplication unit 304_4 obtains tx4ref1(t) × w4(i,1). Then, base station #1 of 901_1 transmits tx4ref1(t) × w4(i,1) from antenna 306_4 in Figure 3.

[0107] This section describes the "reference signal 1201_j based on the jth parameter in the transmitting panel antenna i for frequency ♭p".

[0108] When base station #1 of 901_1 transmits the "reference signal 1201_j based on the jth parameter at the transmitting panel antenna i for frequency ♭p" as shown in Figure 12, base station #1 of 901_1 sets the multiplication coefficient in the multiplication unit 304_1 at the transmitting panel antenna i of 106_i to w1(i,j). If the first transmitting signal 303_1 in the "reference signal 1201_j based on the jth parameter at the transmitting panel antenna i for frequency ♭p" is tx1refj(t), then the multiplication unit 304_1 obtains tx1refj(t) × w1(i,j). Then, base station #1 of 901_1 transmits tx1refj(t) × w1(i,j) from antenna 306_1 in Figure 3. Note that t is time.

[0109] When base station #1 of 901_1 transmits the "reference signal 1201_j based on the jth parameter at the transmitting panel antenna i for frequency ♭p" as shown in Figure 12, base station #1 of 901_1 sets the multiplication coefficient in the multiplication unit 304_2 at the transmitting panel antenna i of 106_i to w2(i,j). If the second transmitting signal 303_2 in the "reference signal 1201_j based on the jth parameter at the transmitting panel antenna i for frequency ♭p" is tx2refj(t), then the multiplication unit 304_2 obtains tx2refj(t) × w2(i,j). Then, base station #1 of 901_1 transmits tx2refj(t) × w2(i,j) from antenna 306_2 as shown in Figure 3.

[0110] When base station #1 of 901_1 transmits the "reference signal 1201_j based on the j-th parameter at the transmitting panel antenna i for frequency ♭p" as shown in Figure 12, base station #1 of 901_1 sets the multiplication coefficient in the multiplication unit 304_3 at the transmitting panel antenna i of 106_i to w3(i,j). If the third transmitting signal 303_3 in the "reference signal 1201_j based on the j-th parameter at the transmitting panel antenna i for frequency ♭p" is tx3refj(t), then the multiplication unit 304_3 obtains tx3refj(t) × w3(i,j). Then, base station #1 of 901_1 transmits tx3refj(t) × w3(i,j) from antenna 306_3 in Figure 3.

[0111] When base station #1 of 901_1 transmits the "reference signal 1201_j based on the j-th parameter at the transmitting panel antenna i for frequency ♭p" as shown in Figure 12, base station #1 of 901_1 sets the multiplication coefficient in the multiplication unit 304_4 at the transmitting panel antenna i of 106_i to w4(i,j). If the fourth transmitting signal 303_4 in the "reference signal 1201_j based on the j-th parameter at the transmitting panel antenna i for frequency ♭p" is tx4refj(t), then the multiplication unit 304_4 obtains tx4refj(t) × w4(i,j). Then, base station #1 of 901_1 transmits tx4refj(t) × w4(i,j) from antenna 306_4 in Figure 3.

[0112] In Figure 12, j is an integer between 1 and 4. While Figure 12 shows the parameter change Z as Z=4, the parameter change Z is not limited to 4; it can be performed similarly if Z is an integer greater than or equal to 1 or 2. In this case, j is an integer between 1 and 4.

[0113] As shown in Figures 11 and 12, when base station #1 of 901_1 transmits the "reference signal 1101_i for sectus sweep on the transmitting panel antenna i for frequency ♭p", the "reference signal 1201_j for the jth parameter on the transmitting panel antenna i for frequency ♭p" is assumed to include, for example, the following information. • The ID (identification number) of the transmitting panel antenna (for example, this corresponds to 'i') • Identification number (ID) of the parameter used in beamforming (directional control) (here, for example, equivalent to j) • When the terminal transmits a reference signal for secta sweeping, the number of time divisions for which the reference signal for secta sweeping can be transmitted (this will be explained later).

[0114] Furthermore, the "reference signal 1201_j based on the jth parameter in the transmitting panel antenna i for frequency ♭p" may include the following information. • Information regarding the frequency band and / or frequency ♭p (which may include information on the number of frequency divisions) (this will be explained later).

[0115] When base station #1 of 901_1 transmits the "ID (identification number) of the transmitting panel antenna for frequency ♭p" and the "ID (identification number) of the parameters used for beamforming (directional control)," the terminal can learn the "ID (identification number) of the transmitting panel antenna" and the "ID (identification number) of the parameters used for beamforming (directional control)" that it has received. This allows base station #1 of 901_1 and the terminal to perform appropriate control, resulting in improved data reception quality.

[0116] Furthermore, the "number of time divisions to which a reference signal for secta sweep can be transmitted when a terminal transmits a reference signal for secta sweep" may be changed by frames and / or time. This can improve the data transmission efficiency of the communication system.

[0117] Furthermore, when base station #1 of 901_1 transmits "information regarding the frequency band and / or frequency ♭p," terminals can obtain this information and transmit "frequency-related information they want the base station to send" to the base station. This allows the base station to perform optimal control, resulting in improved data reception quality.

[0118] Next, we will explain the operation of the time interval from time t1 to t2, which is the terminal response interval in Figure 10. In this embodiment 1, as an example, we will explain the case where the terminal uses OFDM and there are some overlapping frequencies (bands) between the frequencies (bands) used by the base station and the frequencies (bands) used by the terminal.

[0119] Figure 13 shows an example of operation during the time interval from time t1 to t2, which is the terminal response interval. In Figure 13, the horizontal axis represents time. Terminals such as terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6 in Figure 9 transmit a reference signal for secta sweep during the time interval from time t1 to t2, which is the terminal response interval.

[0120] As shown in Figures 10 and 13, for example, base station #1 of 901_1 transmits a sectus sweep reference signal in the time interval from time t0 to t1. Subsequently, in the terminal response interval, which is the time interval from time t1 to t2, there are assumed to be the first transmission section 1301_1 of the terminal "sectus sweep reference signal", the second transmission section 1301_2 of the terminal "sectus sweep reference signal", the third transmission section 1301_3 of the terminal "sectus sweep reference signal", and the fourth transmission section 1301_4 of the terminal "sectus sweep reference signal", as shown in Figure 13.

[0121] Therefore, in the case of Figure 13, the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep is set to 4 by base station #1 of 901_1.

[0122] Figure 14 shows an example of terminal occupation in the first transmission section 1301_1, the second transmission section 1301_2, the third transmission section 1301_3, and the fourth transmission section 1301_4 of the terminal "Sectus Sweep Reference Signal" shown in Figure 13. In Figure 14, the horizontal axis represents time and the vertical axis represents frequency.

[0123] Terminal #1 of 902_1 in Figure 9 receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1, and estimates the frequency band, transmitting panel antenna, and parameter number of the transmitting panel antenna of base station #1 of 901_1 that has good reception quality. This estimation can be performed by obtaining the secta sweep reference signal 1001 and the ID (identification number) of the transmitting panel antenna and the ID of the parameter used for beamforming (directional control) contained therein. Alternatively, information regarding the frequency band and / or frequency ♭p contained in the secta sweep reference signal 1001 may also be used.

[0124] Terminal #1 of 902_1 is assumed to have estimated the "transmitting panel antenna and parameters" with good reception quality to be, for example, "transmitting panel antenna a1 and parameter b1". Furthermore, terminal #1 of 902_1 is assumed to have estimated the "frequency domain" with good reception quality to be the frequency band ♭K.

[0125] 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 to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 14, terminal #1 of 902_1 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 4.

[0126] In this case, terminal #1 of 902_1 uses a random number to obtain one of the following values: for example, "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 "Sectus Sweep Reference Signal" 1401_1 using the "Terminal Sectus Sweep Reference Signal" 1st (= "0" + 1) transmission section 1301_1" in Figure 14. Note that here, a random number is used to set the transmission section of the sectus sweep reference signal, but instead of a random number, 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 uniquely held by the terminal may be used to set the transmission section of the sectus sweep reference signal. Therefore, setting the transmission section of the sectus sweep reference signal is not limited to the example above; for example, the transmission section of the sectus sweep reference signal may be set for each terminal. This point can also be applied to the following similar explanations.

[0127] Furthermore, terminal #1's "reference signal for secta sweep" 1401_1 is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #1 of 902_1, that is, information on "transmitting panel antenna a1 and parameter b1". In addition, terminal #1's "reference signal for secta sweep" 1401_1 may also contain information on the "frequency domain," for example, information on the "frequency band ♭K". This point will be explained later.

[0128] Similarly, terminal #2 of 902_2 in Figure 9 receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1, and estimates the frequency band, transmitting panel antenna, and parameter number of the transmitting panel antenna of base station #1 of 901_1 that has good reception quality. This estimation can be performed by obtaining the secta sweep reference signal 1001 and the ID (identification number) of the transmitting panel antenna and the ID of the parameter used for beamforming (directional control) contained therein. Alternatively, information regarding the frequency band and / or frequency ♭p contained in the secta sweep reference signal 1001 may also be used.

[0129] Terminal #2 of 902_2 is assumed to have estimated the "transmitting panel antenna and parameters" with good reception quality to be, for example, "transmitting panel antenna a2 and parameter b2". Also, terminal #2 of 902_2 is assumed to have estimated the "frequency domain" with good reception quality to be frequency band ♭1.

[0130] Furthermore, terminal #2 of 902_2 estimates the "transmitting panel antenna and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 14, terminal #2 of 902_2 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 4.

[0131] In this case, terminal #2 of 902_2 uses a random number to obtain one of the following values: for example, "0", "1", "2", or "3". For example, suppose terminal #2 of 902_2 obtains "1" using a random number. In this case, "1" + 1 = 2, so terminal #2 of 902_2 transmits terminal #2 "Secta Sweep Reference Signal" 1401_2 using the "Secta Sweep Reference Signal" 2nd (= "1" + 1) transmission section 1301_2 for terminals in Figure 14.

[0132] Furthermore, terminal #2's "Secta Sweep Reference Signal 1401_2" is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, that is, information on "transmitting panel antenna a2 and parameter b2". In addition, terminal #2's "Secta Sweep Reference Signal" 1401_2 may also contain information on the "frequency domain," for example, information on "frequency band ♭1". This point will be explained later.

[0133] Therefore, terminal #i of 902_i receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1 and estimates the "frequency band, transmitting panel antenna, and parameter number" of the transmitting panel antenna of base station #1 of 901_1 that has good reception quality. This estimation can be performed by obtaining the secta sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "identification number (ID) of the parameter used for beamforming (directional control)" contained therein. For example, i is an integer of 1 or more. Alternatively, information regarding the "frequency band and / or frequency ♭p" contained in the secta sweep reference signal 1001 may also be used.

[0134] Terminal #i of 902_i is assumed to be estimated as a "transmitting panel antenna and parameters" with good reception quality, for example, "transmitting panel antenna ai and parameter bi". Also, terminal #i of 902_i is assumed to be estimated as the frequency band ♭zi with good reception quality.

[0135] Furthermore, terminal #i of 902_i estimates the "transmitting panel antenna and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 14, terminal #i of 902_i obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 4.

[0136] In this case, terminal #i of 902_i obtains a value such as "0", "1", "2", or "3" using a random number generator. For example, suppose terminal #i of 902_i obtains "yi" using a random number generator. Note that yi will be one of the values ​​"0", "1", "2", or "3". In this case, terminal #i of 902_i transmits terminal #i "Secta Sweep Reference Signal" 1401_i using the terminal "Secta Sweep Reference Signal" transmission section 1301_("yi"+1) shown in Figure 14.

[0137] Furthermore, terminal #i, "reference signal for sectus sweep" 1401_i, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #i of 902_i, namely, information on "transmitting panel antenna ai and parameter bi". In addition, terminal #i, "reference signal for sectus sweep" 1401_i, may also contain information on the "frequency domain," such as "frequency band ♭p". This point will be explained later.

[0138] As shown in Figure 14, terminal #i "Sectus Sweep Reference Signal" 1401_i may be assigned to multiple frequency bands. For example, terminal #3 "Sectus Sweep Reference Signal" 1401_3 is assigned to frequency bands ♭1 and ♭2. Alternatively, terminal #i "Sectus Sweep Reference Signal" 1401_i may be assigned to discrete frequency bands, such as frequency bands ♭1 and ♭K. (Therefore, terminal #i "Sectus Sweep Reference Signal" 1401_i may be assigned to one or more frequency bands.)

[0139] By doing so, collisions of sectus sweep reference signals transmitted by each terminal can be reduced, thereby increasing the number of sectus sweep reference signals that the base station can receive, and thus increasing the number of terminals that the base station can communicate with.

[0140] The configuration of terminal #i "Sectus Sweep Reference Signal" 1401_i transmitted by terminal #i of 902_i, as explained using Figure 14, will now be described. For the sake of simplicity, terminal #i of 902_i will be assumed to have the configurations shown in Figures 1A, 1B, and 1C. Furthermore, terminal #i of 902_i having the configurations shown in Figures 1A, 1B, and 1C will be assumed to have the configuration shown in Figure 3 as the transmitting panel antenna xi of 106_xi. However, the configuration of terminal #i of 902_i is not limited to the configurations shown in Figures 1A, 1B, and 1C, and the configuration of the transmitting panel antenna xi of terminal #i of 106_xi having the configurations shown in Figures 1A, 1B, and 1C is not limited to Figure 3.

[0141] Terminal #i of 902_i will transmit terminal #i "Sectus Sweep Reference Signal" 1401_i, as shown in Figure 14. Figure 15A shows an example of the configuration of terminal #i "Sectus Sweep Reference Signal" 1401_i. In Figure 15A, the horizontal axis represents time.

[0142] As shown in Figure 15A, terminal #i "Sectus sweep reference signal" 1401_i of 902_i is assumed to consist of "Sectus sweep reference signal 1501_1 at terminal #i transmitting panel antenna 1, Sectus sweep reference signal 1501_2 at terminal #i transmitting panel antenna 2, ..., Sectus sweep reference signal 1501_M at terminal #i transmitting panel antenna M".

[0143] For example, terminal #i of 902_i, having the configurations shown in Figures 1A, 1B, and 1C, transmits the "reference signal 1501_1 for sectus sweep at terminal #i's transmitting panel antenna 1" using the transmitting panel antenna 1 of 106_1.

[0144] Therefore, terminal #i of 902_i, having the configurations shown in Figures 1A, 1B, and 1C, transmits the "reference signal 1501_k for sectus sweep at terminal #i's transmitting panel antenna k" using the transmitting panel antenna k of 106_k. Note that k is an integer between 1 and M, inclusive.

[0145] In Figure 15A, the number of transmitting panel antennas owned by terminal #i of 902_i is denoted as M, but this is not the only option; the number of transmitting panel antennas may also be denoted as N. (N shall be an integer greater than or equal to 1.)

[0146] Figure 15B shows an example configuration of "reference signal 1501_xi for sectus sweep at terminal #i transmitting panel antenna xi" in Figure 15A. Note that in Figure 15, the horizontal axis represents time.

[0147] The "reference signal 1501_xi for sectus sweep at terminal #i transmitting panel antenna xi" is assumed to consist of, for example, "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", as shown in Figure 15B.

[0148] For example, let's assume that terminal #i of 902_i, which has the configurations shown in Figures 1A, 1B, and 1C, has the configuration shown in Figure 3 as the transmitting panel antenna xi of 106_xi.

[0149] This section describes "Reference signal 1511_1 based on the first parameter in the transmitting panel antenna xi".

[0150] When terminal #i of 902_i transmits the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_1 at the transmitting panel antenna xi of 106_xi to w1(xi,1). If the first transmitting signal 303_1 in the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" is tx1ref1(t), then the multiplier unit 304_1 obtains tx1ref1(t) × w1(xi,1). Then, terminal #i of 902_i transmits tx1ref1(t) × w1(xi,1) from antenna 306_1 in Figure 3. Note that t is time.

[0151] When terminal #i of 902_i transmits the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_2 at the transmitting panel antenna xi of 106_xi to w2(xi,1). If the second transmitting signal 303_2 in the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" is tx2ref1(t), then the multiplier unit 304_2 obtains tx2ref1(t) × w2(xi,1). Then, terminal #i of 902_i transmits tx2ref1(t) × w2(xi,1) from antenna 306_2 in Figure 3.

[0152] When terminal #i of 902_i transmits the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_3 at the transmitting panel antenna xi of 106_xi to w3(xi,1). If the third transmitting signal 303_3 in the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" is tx3ref1(t), then the multiplier unit 304_3 obtains tx3ref1(t) × w3(xi,1). Then, terminal #i of 902_i transmits tx3ref1(t) × w3(xi,1) from antenna 306_3 in Figure 3.

[0153] When terminal #i of 902_i transmits the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_4 at the transmitting panel antenna xi of 106_xi to w4(xi,1). If the fourth transmitting signal 303_4 in the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" is tx4ref1(t), then the multiplier unit 304_4 obtains tx4ref1(t) × w4(xi,1). Then, terminal #i of 902_i transmits tx4ref1(t) × w4(xi,1) from antenna 306_4 in Figure 3.

[0154] This section explains the "reference signal 1511_j based on the jth parameter in the transmitting panel antenna xi".

[0155] When terminal #i of 902_i transmits the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_1 at the transmitting panel antenna xi of 106_xi to w1(xi,j). If the first transmitting signal 303_1 in the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" is tx1refj(t), then the multiplier unit 304_1 obtains tx1refj(t) × w1(xi,j). Then, terminal #i of 902_i transmits tx1refj(t) × w1(xi,j) from antenna 306_1 in Figure 3. Note that t is time.

[0156] When terminal #i of 902_i transmits the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_2 at the transmitting panel antenna xi of 106_xi to w2(xi,j). If the second transmitting signal 303_2 in the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" is tx2refj(t), then the multiplier unit 304_2 obtains tx2refj(t) × w2(xi,j). Then, terminal #i of 902_i transmits tx2refj(t) × w2(xi,j) from antenna 306_2 in Figure 3.

[0157] When terminal #i of 902_i transmits the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_3 at the transmitting panel antenna xi of 106_xi to w3(xi,j). If the third transmitting signal 303_3 in the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" is tx3refj(t), then the multiplier unit 304_3 obtains tx3refj(t) × w3(xi,j). Then, terminal #i of 902_i transmits tx3refj(t) × w3(xi,j) from antenna 306_3 in Figure 3.

[0158] When terminal #i of 902_i transmits the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_4 at the transmitting panel antenna xi of 106_xi to w4(xi,j). If the fourth transmitting signal 303_4 in the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" is tx4refj(t), then the multiplier unit 304_4 obtains tx4refj(t) × w4(xi,j). Then, terminal #i of 902_i transmits tx4refj(t) × w4(xi,j) from antenna 306_4 in Figure 3.

[0159] In Figure 15B, j is an integer between 1 and 4. While Figure 15B shows the parameter change Z as Z=4, the parameter change Z is not limited to 4; it can be performed similarly if Z is an integer greater than or equal to 1 or 2. In this case, j is an integer between 1 and 4.

[0160] As shown in Figures 14, 15A, and 15B, when terminal #i of 902_i transmits the "reference signal 1501_xi for sect sweep at terminal #i's transmitting panel antenna xi", the "reference signal 1511_j based on the jth parameter at the transmitting panel antenna xi" is assumed to include, for example, the following information. As mentioned above, information on the "transmitting panel antenna and parameters" of base station #1 of 901_1, which has good reception quality.

[0161] 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 the "reference signal 1501_1 for sect sweep at terminal #i transmitting panel antenna 1", "reference signal 1501_2 for sect sweep at terminal #i transmitting panel antenna 2", ..., "reference signal 1501_M for sect sweep at terminal #i transmitting panel antenna M" in Figure 15A.

[0162] Furthermore, in Figure 15A, "Reference signal 1501_1 for sectus sweep at terminal #i transmitting panel antenna 1", "Reference signal 1501_2 for sectus sweep at terminal #i transmitting panel antenna 2", ..., "Reference signal 1501_M for sectus sweep at terminal #i transmitting panel antenna M", in Figure 15B, "Reference signal 1511_1 for the first parameter at transmitting panel antenna xi", "Reference signal 1511_2 for the second parameter at transmitting panel antenna xi", "Reference signal 1511_3 for the third parameter at transmitting panel antenna xi", and "Reference signal 1511_4 for the fourth parameter at transmitting panel antenna xi", 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".

[0163] In this case, base station #1 of 901_1 is more likely to receive any of the "reference signal 1501_1 for sect sweep at terminal #i transmitting panel antenna 1", "reference signal 1501_2 for sect sweep at terminal #i transmitting panel antenna 2", ..., "reference signal 1501_M for sect sweep at terminal #i transmitting panel antenna M" transmitted by terminal #i of 902_i, even if it uses an omnidirectional antenna. This is because terminal #i of 902_i is performing transmit beamforming (directional control). As a result, base station #1 of 901_1 is more likely to obtain "information on the transmit panel antenna and parameters of base station #1 of 901_1 with good reception quality" transmitted by terminal #i of 902_i. Therefore, the base station #1 of 901_1 can transmit a modulated signal to terminal #i of 902_i based on "information on the transmitting panel antenna and parameters of base station #1 of 901_1, which has good reception quality," and terminal #i of 902_i can receive the modulated signal with high reception quality.

[0164] Furthermore, as shown in Figure 14, if multiple terminals are transmitting a reference signal for sect sweeping, 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 multiple terminals. As a result, base station #1 of 901_1 can transmit a modulated signal to 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 multiple terminals, and multiple terminals can receive the modulated signal with high reception quality.

[0165] Furthermore, as shown in Figures 14, 15A, and 15B, when terminal #i of 902_i transmits the "reference signal 1501_xi for sect sweep at terminal #i's transmitting panel antenna xi", the "reference signal 1511_j based on the jth parameter at the transmitting panel antenna xi" may include, for example, the following information. • Transmitting panel antenna ID (identification number) (Here, for example, this corresponds to xi) • Identification number (ID) of the parameter used in beamforming (directional control) (here, for example, equivalent to j)

[0166] When terminal #i of 902_i transmits the "transmitting panel antenna ID (identification number)" and the "identification number (ID) of the parameters used for beamforming (directional control)," base station #1 of 901_1 can learn the "transmitting panel antenna ID (identification number)" and the "identification number (ID) of the parameters used for beamforming (directional control)" that it received. This allows terminal #i of 902_i and base station #1 of 901_1 to perform appropriate control, resulting in improved data reception quality.

[0167] Then, as shown in Figures 14, 15A, and 15B, when terminal #i of 902_i transmits the "reference signal 1501_xi for sect sweep at terminal #i's transmitting panel antenna xi", the "reference signal 1511_j based on the jth parameter at the transmitting panel antenna xi" may include, for example, the following information. • Information regarding the frequency band and / or frequency ♭p used by terminal #i of 902_i for transmission, or to be used by base station #1 of 901_1.

[0168] When terminal #i of 902_i transmits the "information regarding the frequency band and / or frequency ♭p", base station #1 of 901_1 can learn about the "information regarding the frequency band and / or frequency ♭p", enabling terminal #i of 902_i and base station #1 of 901_1 to perform appropriate control, thereby improving the quality of data reception.

[0169] However, if base station #1 of 901_1 and terminal #i of 902_i are communicating using the same frequency band, they can learn the "information regarding the frequency band and / or frequency ♭p" by detecting the modulated signal transmitted by the other party, even without transmitting the aforementioned "information regarding the frequency band and / or frequency ♭p".

[0170] Figure 16A shows an example of the configuration of the feedback signal 1002 transmitted by base station #1 of 901_1 in the time interval from t2 to t3 in Figure 10. In Figure 16A, the horizontal axis represents time and the vertical axis represents frequency. In this example, since the "number of time divisions to which the reference signal for sect sweep can be transmitted when the terminal transmits the reference signal for sect sweep" is 4, the feedback signal 1002 has a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, as shown in Figure 16A. For example, if the "number of time divisions to which the reference signal for sect sweep can be transmitted when the terminal transmits the reference signal for sect sweep" is Ω, the feedback signal 1002 may have a configuration in which there are Ω transmission sections. However, Ω is an integer of 1 or more or an integer of 2 or more.

[0171] Furthermore, in Figure 16A, the feedback signal 1002 is assumed to have frequency bands ♭1, ♭2, ..., and ♭K.

[0172] Therefore, the first transmission section will contain the first transmission section 1601_11 for frequency ♭1, the first transmission section 1601_21 for frequency ♭2, ..., and the first transmission section 1601_K1 for frequency ♭K. Similarly, the second transmission section will contain the second transmission section 1601_12 for frequency ♭1, the second transmission section 1601_22 for frequency ♭2, ..., and the second transmission section 1601_K2 for frequency ♭K. The third transmission section will contain the third transmission section 1601_13 for frequency ♭1, the third transmission section 1601_23 for frequency ♭2, ..., and the third transmission section 1601_K3 for frequency ♭K. The fourth transmission section will contain the feedback signal fourth transmission section 1601_14 for frequency ♭1, the feedback signal fourth transmission section 1601_24 for frequency ♭2, ..., and the feedback signal fourth transmission section 1601_K4 for frequency ♭K.

[0173] One notable feature of Figure 16A is that, in the i-th time interval, the feedback signal is transmitted from the same transmitting panel antenna, regardless of the frequency band.

[0174] Figure 16B shows an example of a specific feedback signal assignment for the feedback signal 1002 shown in Figure 16A.

[0175] For example, as shown in Figure 14, terminal #1 of 902_1 transmits terminal #1 "Sectus Sweep Reference Signal" 1401_1, terminal #2 of 902_2 transmits terminal #2 "Sectus Sweep Reference Signal" 1401_2, terminal #3 of 902_3 transmits terminal #3 "Sectus Sweep Reference Signal" 1401_3, terminal #4 of 902_4 transmits terminal #4 "Sectus Sweep Reference Signal" 1401_4, terminal #5 of 902_5 transmits terminal #5 "Sectus Sweep Reference Signal" 1401_5, and terminal #6 of 902_6 transmits terminal #6 "Sectus Sweep Reference Signal" 1401_6.

[0176] As shown in Figure 14, terminal #1 "reference signal for sectus sweep" 1401_1 is located in frequency band ♭K, therefore in Figure 16B, the feedback signal 1611_1 addressed to terminal #1 is located in frequency band ♭K.

[0177] As shown in Figure 14, terminal #2, the "reference signal for sectus sweep" 1401_2, is located in frequency band ♭1. Therefore, in Figure 16B, the feedback signal 1611_2 addressed to terminal #2 is located in frequency band ♭1.

[0178] As shown in Figure 14, terminal #3, the "reference signal for sectus sweep" 1401_3, is located in frequency bands ♭1 and ♭2. Therefore, in Figure 16B, the feedback signal 1611_3 addressed to terminal #3 is located in frequency bands ♭1 and ♭2.

[0179] As shown in Figure 14, terminal #4, the "reference signal for sectus sweep" 1401_4, is located in frequency band ♭2. Therefore, in Figure 16B, the feedback signal 1611_4 addressed to terminal #4 is located in frequency band ♭2.

[0180] As shown in Figure 14, terminal #5, the "reference signal for sectus sweep" 1401_5, is located in frequency band ♭2. Therefore, in Figure 16B, the feedback signal 1611_5 addressed to terminal #5 is located in frequency band ♭2.

[0181] As shown in Figure 14, terminal #6, the "reference signal for sectus sweep" 1401_6, is located in the frequency band ♭K. Therefore, in Figure 16B, the feedback signal 1611_6 addressed to terminal #6 is located in the frequency band ♭K.

[0182] In this way, terminal #i of 902_i can receive feedback signal 1611_i addressed to terminal #i, thereby knowing that communication with base station #1 of 901_1 has become possible, and also knowing the frequency band to be used. Note that Figure 16B is merely an example; 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 was not established.

[0183] In this case, the feedback signal 1611_i addressed to terminal #i is assumed to contain information such as, for example, that communication with terminal #i of 902_i is possible (or that frame 1003 containing the data symbol in Figure 10 contains a symbol addressed to terminal #i of 902_i).

[0184] Furthermore, based on the information transmitted by terminal #i of 902_i regarding the frequency band, transmitting panel antenna, and parameters of base station #1 of 901_1, which has good reception quality, base station #1 of 901_1 will select the frequency band and transmitting panel antenna, set the beamforming parameters, and transmit the feedback signal 1611_i to terminal #i.

[0185] Figure 17A shows an example of the configuration of frame 1003 containing data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 10. In Figure 17A, the horizontal axis represents time and the vertical axis represents frequency. In this example, since the "number of time divisions to which a reference signal for sect sweep can be transmitted when a terminal transmits a reference signal for sect sweep" is 4, as shown in Figure 17A, frame 1003 containing data symbols will have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section. For example, if the "number of time divisions to which a reference signal for sect sweep can be transmitted when a terminal transmits a reference signal for sect sweep" is Ω, then frame 1003 containing data symbols may have Ω transmission sections. However, Ω is an integer of 1 or more or an integer of 2 or more.

[0186] Furthermore, in Figure 17A, frame 1003 containing data symbols is assumed to have frequency bands ♭1, ♭2, ..., and ♭K.

[0187] Therefore, in the first transmission interval, there will be a modulation signal (slot) for frequency ♭1, the first transmission interval 1701_11, a modulation signal (slot) for frequency ♭2, the first transmission interval 1701_21, ···, a modulation signal (slot) for frequency ♭K, the first transmission interval 1701_K1. Similarly, in the second transmission interval, there will be a modulation signal (slot) for frequency ♭1, the second transmission interval 1701_12, a modulation signal (slot) for frequency ♭2, the second transmission interval 1701_22, ···, a modulation signal (slot) for frequency ♭K, the second transmission interval 1701_K2. In the third transmission interval, there will be a modulation signal (slot) for frequency ♭1, the third transmission interval 1701_13, a modulation signal (slot) for frequency ♭2, the third transmission interval 1701_23, ···, a modulation signal (slot) for frequency ♭K, the third transmission interval 1701_K3. In the fourth transmission interval, there will be a modulation signal (slot) for frequency ♭1, the fourth transmission interval 1701_14, a modulation signal (slot) for frequency ♭2, the fourth transmission interval 1701_24, ···, a modulation signal (slot) for frequency ♭K, the fourth transmission interval 1701_K4.

[0188] Figure 17B shows an example of the assignment of specific modulation signals (slots) to the frame 1003 including the data symbols shown in Figure 17A.

[0189] For example, as shown in Figure 14, assume that terminal #1 of 902_1 transmits the terminal #1 "sector sweep reference signal" 1401_1, terminal #2 of 902_2 transmits the terminal #2 "sector sweep reference signal" 1401_2, terminal #3 of 902_3 transmits the terminal #3 "sector sweep reference signal" 1401_3, terminal #4 of 902_4 transmits the terminal #4 "sector sweep reference signal" 1401_4, terminal #5 of 902_5 transmits the terminal #5 "sector sweep reference signal" 1401_5, and terminal #6 of 902_6 transmits the terminal #6 "sector sweep reference signal" 1401_6.

[0190] As shown in Figure 14, terminal #1 "reference signal for sectus sweep" 1401_1 is located in frequency band ♭K, therefore in Figure 17B, the modulated signal (slot) 1711 addressed to terminal #1 is located in frequency band ♭K.

[0191] As shown in Figure 14, terminal #2, the "reference signal for sectus sweep" 1401_2, is located in frequency band ♭1. Therefore, in Figure 17B, the modulated signal (slot) 1712 addressed to terminal #2 is located in frequency band ♭1.

[0192] As shown in Figure 14, terminal #3, the "reference signal for sectus sweep" 1401_3, is located in frequency bands ♭1 and ♭2. Therefore, in Figure 17B, the modulated signal (slot) 1713 addressed to terminal #3 is located in frequency bands ♭1 and ♭2.

[0193] As shown in Figure 14, terminal #4, the "reference signal for sectus sweep" 1401_4, is located in frequency band ♭2. Therefore, in Figure 17B, the modulated signal (slot) 1714 addressed to terminal #4 is located in frequency band ♭2.

[0194] As shown in Figure 14, terminal #5, the "reference signal for sectus sweep" 1401_5, is located in frequency band ♭2. Therefore, in Figure 17B, the modulated signal (slot) 1715 addressed to terminal #5 is located in frequency band ♭2.

[0195] As shown in Figure 14, terminal #6, the "reference signal for sectus sweep" 1401_6, is located in frequency band ♭K. Therefore, in Figure 17B, the modulated signal (slot) 1716 addressed to terminal #6 is located in frequency band ♭K.

[0196] In this case, the modulated signal (slot) 171i addressed to terminal #i is assumed to contain, for example, a data symbol (data, information) addressed to terminal #i, such as 902_i.

[0197] In this way, terminal #i of 902_i can know that communication with base station #1 of 901_1 has become possible via the 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; for example, if the modulated signal (slot) 1711 addressed to terminal #1 does not exist as frame 1003 containing data symbols, terminal #1 of 902_1 will know that communication with base station #1 of 901_1 was not established.

[0198] At this time, based on the information transmitted by terminal #i of 902_i regarding the frequency band, transmitting panel antenna, and parameters of base station #1 of 901_1, which has good reception quality, base station #1 of 901_1 will select the frequency band and transmitting panel antenna, set the beamforming parameters, and transmit the modulated signal (slot) 171i addressed to terminal #i.

[0199] In addition, in Figures 16A and 16B, base station #1 of 901_1 receives the terminal #i "Sectus Sweep Reference Signal" 1401_i transmitted by terminal #i of 902_i, estimates the frequency (band), transmitting panel antenna, and parameters of terminal #i of 902_1 with good reception quality, and this information may be included in the feedback signal 1611_i addressed to terminal #i.

[0200] As a result, terminal #i of 902_i selects a frequency band and transmitting panel antenna, determines a beamforming method, and transmits symbols, frames, and / or modulated signals to base station #1 of 901_1 based on the information obtained from base station #1 of 901_1 regarding the frequency band, transmitting panel antenna, and parameters of terminal #i of 902_i with good reception quality. This results in improved data reception quality at base station #1 of 901_1.

[0201] Furthermore, in the time interval from t3 to t4 in Figure 10, terminal #i of 902_i may transmit a modulated signal to base station #1 of 901_1 that includes information such as an ACK (acknowledgement) indicating that it was able to receive the signal from base station #1 of 901_1.

[0202] In addition to data symbols, the modulated signal (slot) 171i addressed to terminal #i in Figure 17B may also include, for example, reference signals such as DMRS (demodulation reference signal), PTRS (phase tracking reference signal), and SRS (sounding reference signal), pilot symbols, pilot signals, preambles, and symbols containing control information. The symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and information about the MCS (Modulation and Coding Scheme).

[0203] Figure 18 shows an example of the situation when base station #1 of 901_1 is communicating 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," as shown in Figure 9. Figure 18(A) shows an example of the transmission status of modulated signals from base station #1 of 901_1, and Figure 18(B) shows an example of the transmission status of modulated signals 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." Note that in Figures 18(A) and 18(B), the horizontal axis represents time.

[0204] First, base station #1 of 901_1 transmits the reference signal 1801_1 for secta sweep. This point has already been explained using Figure 10, so the explanation will be omitted here.

[0205] 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 the secta sweep reference signal 1851_1. This point has already been explained using Figures 13, 14, 15A, and 15B, so the explanation will be omitted here.

[0206] Base station #1 of 901_1 transmits feedback signal 1802_1. This point has already been explained using Figures 16A and 16B, so the explanation will be omitted here.

[0207] Subsequently, base station #1 of 901_1 transmits "frame 1803_1 containing data symbols." This point has already been explained using Figures 17A and 17B, so the explanation will be omitted here. (Therefore, "frame 1803_1 containing data symbols" can be considered, for example, a downlink frame.)

[0208] 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 containing data symbols." The structure of this frame will be explained later using Figures 20A to 20F. (Therefore, "frame 1852_1 containing data symbols" can be considered, for example, as an uplink frame.)

[0209] Next, base station #1 of 901_1 transmits "frame 1803_2 containing data symbols". The structure of "frame 1803_2 containing data symbols" is as explained using Figures 17A and 17B.

[0210] 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, Terminal #6 of 902_6" transmit "Frame 1852_2 containing data symbols". The configuration of this frame will be described later using FIGS. 20A to 20F.

[0211] FIG. 19 shows an example of the transmission status of the modulation signal of Base Station #1 of 901_1 after FIG. 18 and the transmission status of the modulation signals of 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, Terminal #6 of 902_6".

[0212] FIG. 19(A) shows an example of the transmission status of the modulation signal of Base Station #1 of 901_1 and is a time continuation of the transmission status of the modulation signal of Base Station #1 of 901_1 in FIG. 18(A).

[0213] FIG. 19(B) shows an example of the transmission status of the modulation 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, Terminal #6 of 902_6" and is a time continuation of the transmission status of the modulation 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, Terminal #6 of 902_6" in FIG. 18(B).

[0214] In FIGS. 19(A) and 19(B), the horizontal axis is assumed to be time.

[0215] [[ID=第十九]] After FIGS. 18(A) and (B), Base Station #1 of 901_1 transmits "Frame 1803_3 containing data symbols". The method of configuring "Frame 1803_3 containing data symbols" is as described using FIGS. 17A and 17B.

[0216] It should be noted that in the translation of line 19, since the original text is " ", which seems to be an unclear or misformatted tag, it is directly retained as " ". If there is any specific meaning or correction required for this part, please provide more context or clarify the requirement. Also, for line 20, "第十九" in the original seems to be an error or out-of-place text, and the translation is done based on the following text as normal.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 containing data symbols". The structure of this frame will be explained later using Figures 20A to 20F.

[0217] Next, base station #1 of 901_1 transmits the reference signal 1801_2 for the secta sweep. This point has already been explained using Figure 10, so the explanation will be omitted here.

[0218] 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 the secta sweep reference signal 1851_2. This point has already been explained using Figures 13, 14, 15A, and 15B, so the explanation will be omitted here.

[0219] Base station #1 of 901_1 transmits feedback signal 1802_2. This point has already been explained using Figures 16A and 16B, so the explanation will be omitted here.

[0220] Subsequently, base station #1 of 901_1 transmits "frame 1803_4 containing data symbols". This point has already been explained using Figures 17A and 17B, so the explanation will be omitted here.

[0221] Then, terminals such as "Terminal #1 of 902_1, Terminal #2 of 902_2, Terminal #3 of 902_3, Terminal #4 of 902_4, Terminal #5 of 902_5, and Terminal #6 of 902_6" transmit "frame 1852_4 containing data symbols". The structure of this frame will be explained later using Figures 20A to 20F.

[0222] Thus, before the transmission of the "frame containing data symbols" by base station #1 of 901_1, and / or the transmission of the "frame containing 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, terminal #6 of 902_6", base station #1 of 901_1 and the terminals transmit a reference signal for sect sweep, and before the transmission of the "frame containing data symbols" by base station #1 of 901_1, and Alternatively, after the transmission of a "frame containing data symbols" 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, Terminal #6 of 902_6", the base station and / or terminals can achieve the effect of obtaining high data reception quality by transmitting a reference signal for sect sweeping again, setting the frequency (band), selecting the transmitting panel antenna to be used, and setting the transmit beamforming.

[0223] Next, we will explain the structure of "frame 1852_i containing 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" using Figures 20A to 20F. For example, i is assumed to be an integer of 1 or greater, and the horizontal axis in Figures 20A to 20F represents time.

[0224] As shown in Figures 20A, 20B, 20C, 20D, 20E, and 20F, the "frame 1852_i containing data symbols" is assumed to consist of a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section. Furthermore, the "frame 1852_i containing data symbols" is assumed to have frequency bands ♭1, ♭2, ..., and ♭K.

[0225] As shown in Figure 20A, for example, terminal #1 of 902_1 transmits terminal #1 transmission frame 2001_1 (including data symbols) using the frequency band ♭K and the first transmission section.

[0226] Furthermore, "Terminal #1 of 902_1 transmits terminal #1 transmission frame 2001_1 (including data symbols) using frequency band ♭K," because, as shown in Figure 17B, "base station #1 of 901_1 transmits a modulated signal (slot) addressed to terminal #1 of 902_1 using frequency band ♭K."

[0227] Furthermore, as shown in Figure 20B, for example, terminal #2 of 902_2 transmits terminal #2 transmission frame 2001_2 (including data symbols) using frequency band ♭1 and the second transmission section.

[0228] Furthermore, "Terminal #2 of 902_2 transmits terminal #2 transmission frame 2001_2 (including data symbols) using frequency band ♭1," because, as shown in Figure 17B, "base station #1 of 901_1 transmits a modulated signal (slot) addressed to terminal #2 of 902_2 using frequency band ♭1."

[0229] As shown in Figure 20C, for example, terminal #3 of 902_3 transmits terminal #3 transmission frame 2001_3 (including data symbols) using frequency bands ♭1 and ♭2 and the third transmission section.

[0230] Furthermore, "Terminal #3 of 902_3 transmits terminal #3 transmission frame 2001_3 (including data symbols) using frequency bands ♭1 and ♭2," because, as shown in Figure 17B, "base station #1 of 901_1 transmits a modulated signal (slot) addressed to terminal #3 of 902_3 using frequency bands ♭1 and ♭2."

[0231] As shown in Figure 20D, for example, terminal #4 of 902_4 transmits terminal #4 transmission frame 2001_4 (including data symbols) using frequency band ♭2 and the first transmission interval.

[0232] Furthermore, "Terminal #4 of 902_4 transmits terminal #4 transmission frame 2001_4 (including data symbols) using frequency band ♭2," because, as shown in Figure 17B, "base station #1 of 901_1 transmits a modulated signal (slot) addressed to terminal #4 of 902_4 using frequency band ♭2."

[0233] As shown in Figure 20E, for example, terminal #5 of 902_5 transmits terminal #5 transmission frame 2001_5 (including data symbols) using frequency band ♭2 and the fourth transmission interval.

[0234] Furthermore, "Terminal #5 of 902_5 transmits terminal #5 transmission frame 2001_5 (including data symbols) using frequency band ♭2," because, as shown in Figure 17B, "base station #1 of 901_1 transmits a modulated signal (slot) addressed to terminal #5 of 902_5 using frequency band ♭2."

[0235] As shown in Figure 20F, for example, terminal #6 of 902_6 transmits terminal #6 transmission frame 2001_6 (including data symbols) using the frequency band ♭K and the third transmission section.

[0236] Furthermore, "Terminal #6 of 902_6 transmits terminal #6 transmission frame 2001_6 (including data symbols) using frequency band ♭K," because, as shown in Figure 17B, "base station #1 of 901_1 transmits a modulated signal (slot) addressed to terminal #6 of 902_6 using frequency band ♭K."

[0237] In this way, "frame 1852_i containing 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 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. This suppresses interference and allows for high data reception quality.

[0238] In addition, in the 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 shown in Figures 20A, 20B, 20C, 20D, 20E, and 20F, symbols other than data symbols may be included, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, symbols containing control information, etc.

[0239] Figures 20A, 20B, 20C, 20D, 20E, and 20F illustrate the case where the frames transmitted by the terminal are handled using OFDMA and time-based partitioning. However, the frames transmitted by the terminal may also be handled using MU-MIMO (Multi-User-MIMO (Multiple-Input Multiple-Output)) and spatial partitioning.

[0240] Figure 14 shows an example of terminal occupation for the "Terminal 'Sectus Sweep Reference Signal' First Transmission Section 1301_1, Terminal 'Sectus Sweep Reference Signal' Second Transmission Section 1301_2, Terminal 'Sectus Sweep Reference Signal' Third Transmission Section 1301_3, and Terminal 'Sectus Sweep Reference Signal' Fourth Transmission Section 1301_4" shown in Figure 13.

[0241] Figures 21A and 21B illustrate an example of terminal occupation for the "Terminal 'Sectus Sweep Reference Signal' First Transmission Section 1301_1, Terminal 'Sectus Sweep Reference Signal' Second Transmission Section 1301_2, Terminal 'Sectus Sweep Reference Signal' Third Transmission Section 1301_3, and Terminal 'Sectus Sweep Reference Signal' Fourth Transmission Section 1301_4" shown in Figure 13, which differs from Figure 14.

[0242] In Figures 21A and 21B, components that operate similarly to those in Figures 13 and 14 are given the same numbers and have already been explained, so their explanations are omitted here. The following explains the differences from the explanation in Figure 14.

[0243] Terminal #2 of 902_2 in Figure 9 receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1, and by obtaining the "frequency (band)" with good reception quality, the "ID (identification) (identification number) of the transmitting panel antenna," and the "identification number (ID) of the parameters used in beamforming (directional control)," it is possible to communicate with base station #1 of 901_1.

[0244] Terminal #2 of 902_2 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a2 and parameter b2".

[0245] Furthermore, terminal #2 of 902_2 estimates the "transmitting panel antenna and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 21A, terminal #2 of 902_2 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 4.

[0246] In this case, terminal #2 of 902_2 uses a random number to obtain one of the following values: for example, "0", "1", "2", or "3". For example, suppose 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 "Secta Sweep Reference Signal" 1401_2 using frequency band ♭1, "Third Transmission Section 1301_3 of Terminal "Secta Sweep Reference Signal".

[0247] Furthermore, terminal #2, "reference signal for sectus sweep" 1401_2, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, that is, information on "transmitting panel antenna a2 and parameter b2".

[0248] Terminal #3 of 902_3 in Figure 9 receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1, and by obtaining the "frequency (band)" with good reception quality, the "ID (identification) (identification number) of the transmitting panel antenna," and the "identification number (ID) of the parameters used in beamforming (directional control)," it is possible to communicate with base station #1 of 901_1.

[0249] Terminal #3 of 902_3 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a3 and parameter b3".

[0250] Furthermore, terminal #3 of 902_3 estimates the "transmitting panel antenna and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 21B, terminal #3 of 902_3 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 4.

[0251] In this case, terminal #3 of 902_3 uses a random number to obtain one of the following values: "0", "1", "2", or "3". For example, suppose 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 "Secta Sweep Reference Signal" 1401_3 using frequency band ♭1, "Third Transmission Section 1301_3 of Terminal "Secta Sweep Reference Signal".

[0252] Furthermore, terminal #3, "Reference signal for Sectus Sweep" 1401_3, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, that is, information on "transmitting panel antenna a3 and parameter b3".

[0253] At this time, as shown in Figures 21A and 21B, the time intervals of "Terminal #2 'Sectus Sweep Reference Signal' 1401_2 transmitted by Terminal #2 of 902_2" and "Terminal #3 'Sectus Sweep Reference Signal' 1401_3 transmitted by Terminal #3 of 902_3" overlap.

[0254] Therefore, base station #1 of 901_1 may simultaneously receive terminal #2 "reference signal for secta sweep" 1401_2 and terminal #3 "reference signal for secta sweep" 1401_3.

[0255] In this case, the following two scenarios are possible.

[0256] <Case 1> Both "Terminal #2 'Sectus Sweep Reference Signal' 1401_2 transmitted by Terminal #2 of 902_2" and "Terminal #3 'Sectus Sweep Reference Signal' 1401_3 transmitted by Terminal #3 of 902_3" have the configurations shown in Figures 15A and 15B.

[0257] At this time, when base station #1 of 901_1 receives the terminal #2 "Sectus Sweep Reference Signal" 1401_2 transmitted by terminal #2 of 902_2, the parameters for the transmitting panel antenna and beamforming of terminal #2 of 902_2 that have good reception quality are different from those for base station #1 of 901_1 receiving the terminal #3 "Sectus Sweep Reference Signal" 1401_3 transmitted by terminal #3 of 902_3. Therefore, base station #1 of 901_1 is assumed to have obtained both the information contained in the terminal #2 "Sectus Sweep Reference Signal" 1401_2 transmitted by terminal #2 of 902_2 and the information contained in the terminal #3 "Sectus Sweep Reference Signal" 1401_3 transmitted by terminal #3 of 902_3.

[0258] In this case, for example, in Figure 16A, the second transmission section 1601_12 of the feedback signal for frequency ♭1 is set as a signal destined for terminal #2 of 902_2, and the third transmission section 1601_13 of the feedback signal for frequency ♭1 is set as a signal destined for terminal #3 of 902_3.

[0259] Furthermore, for example, in Figure 17A, the second transmission section 1701_12 of the modulation signal (slot) for frequency ♭1 is set as a signal destined for terminal #2 of 902_2, and the third transmission section 1701_13 of the modulation signal (slot) for frequency ♭1 is set as a signal destined for terminal #3 of 902_3.

[0260] In this way, base station #1 of 901_1 can communicate with terminal #2 of 902_2 and terminal #3 of 902_3.

[0261] <Case 2> Both "Terminal #2 'Sectus Sweep Reference Signal' 1401_2 transmitted by Terminal #2 of 902_2" and "Terminal #3 'Sectus Sweep Reference Signal' 1401_3 transmitted by Terminal #3 of 902_3" have the configurations shown in Figures 15A and 15B.

[0262] At this time, it is assumed that when base station #1 of 901_1 receives the terminal #2 "Sectus 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" that provide good reception quality, and when base station #1 of 901_1 receives the terminal #3 "Sectus 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" that provide good reception quality, interference occurs.

[0263] <Case 2-1> Base station #1 of 901_1 may obtain either the information contained in "Terminal #2 'Secta Sweep Reference Signal' 1401_2 transmitted by Terminal #2 of 902_2" or the information contained in "Terminal #3 'Secta Sweep Reference Signal' 1401_3 transmitted by Terminal #3 of 902_3".

[0264] For example, let's assume that base station #1 of 901_1 has obtained the information contained in "Terminal #2 "Secta Sweep Reference Signal" 1401_2 transmitted by Terminal #2 of 902_2".

[0265] In this case, for example, in Figure 16A, the second transmission section 1601_12 of the feedback signal for frequency ♭1 is set to the signal destined for terminal #2 of 902_2.

[0266] Also, for example, in Figure 17A, the second transmission section 1701_12 of the modulation signal (slot) for frequency ♭1 is set to the signal destined for terminal #2 of 902_2.

[0267] In this way, base station #1 of 901_1 can communicate with terminal #1 of 902_1 and terminal #2 of 902_2.

[0268] This section describes the operation of terminal #3 in 902_3.

[0269] Let's assume that the reference signal 1851_1 for the secta sweep in Figure 18 is in the state shown in Figures 21A and 21B. Therefore, frames 1803_1, 1803_2, and 1803_3 containing the data symbols in Figure 18 do not contain any frames (slots) destined for terminal #3 of 902_3.

[0270] In this case, terminal #3 of 902_3 in Figure 9 receives the sectus sweep reference signal 1801_2 shown in Figure 19 transmitted by base station #1 of 901_1, and by obtaining a "frequency (band)" with good reception quality, the "ID (identification) (identification number) of the transmitting panel antenna," and the "identification number (ID) of the parameters used in beamforming (directional control)," it is possible to communicate with base station #1 of 901_1.

[0271] Terminal #3 of 902_3 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a3 and parameter b3".

[0272] Furthermore, terminal #3 of 902_3 performs these estimations and simultaneously obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." Terminal #3 of 902_3 obtains the information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 4.

[0273] In this case, terminal #3 of 902_3 uses a random number to obtain one of the following values: "0", "1", "2", or "3". For example, suppose terminal #3 of 902_3 generates a random number using a different sequence than the previous one and obtains "3". In this case, "3" + 1 = 4, so terminal #3 of 902_3 transmits terminal #3 "secta sweep reference signal" 1401_3 using frequency band ♭1 and the fourth transmission section 1301_4 of the terminal "secta sweep reference signal", as shown in Figure 22A.

[0274] Furthermore, terminal #3, "Reference signal for Sectus Sweep" 1401_3, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, that is, information on "transmitting panel antenna a3 and parameter b3".

[0275] At this time, as shown in Figure 22A, base station #1 of 901_1 will receive the "Secta Sweep Reference Signal 1401_3" transmitted by terminal #3 of 902_3, and thereafter, base station #1 of 901_1 and terminal #3 of 902_3 will communicate after performing the predetermined procedure described above.

[0276] As another example, let's assume that terminal #3 of 902_3 estimates the frequency band ♭K as the "frequency (band)" with good reception quality, and estimates the "transmitting panel antenna and parameters" as, for example, "transmitting panel antenna a3 and parameter b3".

[0277] At this time, as shown in Figure 22B, base station #1 of 901_1 will receive the "Sectus Sweep Reference Signal 1401_3" transmitted by terminal #3 of 902_3, and thereafter, the aforementioned predetermined procedure will be performed, and base station #1 of 901_1 and terminal #3 of 902_3 will communicate. This is because "interference between terminal #3's Sectus Sweep Reference Signal 1401_3 and terminal #2's Sectus Sweep Reference Signal 1401_2 transmitted by terminal #2 of 902_2 in Figure 21A can be avoided."

[0278] <Case 2-2> There are cases where base station #1 of 901_1 cannot obtain both the information contained in "Terminal #2 'Secta Sweep Reference Signal' 1401_2 transmitted by Terminal #2 of 902_2" and the information contained in "Terminal #3 'Secta Sweep Reference Signal' 1401_3 transmitted by Terminal #3 of 902_3".

[0279] In the case of the sectus sweep reference signal 1851_1 in Figure 18, assuming the situation is as shown in Figures 21A and 21B, base station #1 of 901_1 cannot obtain either the information contained in "Terminal #2 "Sectus Sweep Reference Signal" 1401_2 transmitted by Terminal #2 of 902_2" or the information contained in "Terminal #3 "Sectus Sweep Reference Signal" 1401_3 transmitted by Terminal #3 of 902_3". In this case, frames 1803_1, 1803_2, and 1803_3 containing the data symbols in Figure 18 will not contain frames (slots) addressed to Terminal #2 of 902_2 or frames (slots) addressed to Terminal #3 of 902_3.

[0280] In this case, terminal #2 of 902_2 in Figure 9 receives the secta sweep reference signal 1801_2 shown in Figure 19 transmitted by base station #1 of 901_1, and by obtaining the "frequency (band)", "ID (identification) (identification number) of the transmitting panel antenna" and the "identification number (ID) of the parameters used in beamforming (directional control)" with good reception quality, it is possible to communicate with base station #1 of 901_1.

[0281] Terminal #2 of 902_2 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a2 and parameter b2".

[0282] Furthermore, terminal #2 of 902_2 performs these estimations and simultaneously obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." Terminal #2 of 902_2 obtains the information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 4.

[0283] In this case, terminal #2 of 902_2 uses a random number to obtain one of the following values: for example, "0", "1", "2", or "3". For example, suppose terminal #2 of 902_2 generates a random number using a different sequence than the previous time and obtains "2". In this case, since "2" + 1 = 3, terminal #2 of 902_2 transmits terminal #2 "Secta Sweep Reference Signal" 1401_2 using frequency band ♭1, "Third Transmission Section 1301_3 of Terminal "Secta Sweep Reference Signal".

[0284] Furthermore, terminal #2's "reference signal for sectus sweep" 1401_2 is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, that is, information on "transmitting panel antenna a2 and parameter b3".

[0285] At this time, as shown in Figure 21A, base station #1 of 901_1 will receive the "Secta Sweep Reference Signal 1401_2" transmitted by terminal #2 of 902_2, and thereafter, base station #1 of 901_1 and terminal #2 of 902_2 will communicate after performing the predetermined procedure described above.

[0286] Similarly, terminal #3 of 902_3 in Figure 9 receives the sectus sweep reference signal 1801_2 shown in Figure 19 transmitted by base station #1 of 901_1, and by obtaining the "frequency (band)," "ID (identification) of the transmitting panel antenna," and "ID of the parameters used in beamforming (directional control)" with good reception quality, it is possible to communicate with base station #1 of 901_1.

[0287] Terminal #3 of 902_3 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a3 and parameter b3".

[0288] Furthermore, terminal #3 of 902_3 performs these estimations and simultaneously obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." Terminal #3 of 902_3 obtains the information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 4.

[0289] In this case, terminal #3 of 902_3 uses a random number to obtain one of the following values: "0", "1", "2", or "3". For example, suppose terminal #3 of 902_3 generates a random number using a different sequence than the previous time and obtains "3". In this case, "3" + 1 = 4, so terminal #3 of 902_3 transmits terminal #3 "Sectus Sweep Reference Signal" 1401_3 using frequency band ♭1, "Terminal "Sectus Sweep Reference Signal" 4th transmission section 1301_4", as shown in Figure 22A.

[0290] Furthermore, terminal #3, "Reference signal for Sectus Sweep" 1401_3, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, that is, information on "transmitting panel antenna a3 and parameter b3".

[0291] At this time, as shown in Figure 22A, base station #1 of 901_1 will receive the "Secta Sweep Reference Signal 1401_3" transmitted by terminal #3 of 902_3, and thereafter, base station #1 of 901_1 and terminal #3 of 902_3 will communicate after performing the predetermined procedure described above.

[0292] As another example, let's assume that terminal #3 of 902_3 estimates the frequency band ♭K as the "frequency (band)" with good reception quality, and estimates the "transmitting panel antenna and parameters" as, for example, "transmitting panel antenna a3 and parameter b3".

[0293] At this time, as shown in Figure 22B, base station #1 of 901_1 will receive the "Sectus Sweep Reference Signal 1401_3" transmitted by terminal #3 of 902_3, and thereafter, the aforementioned predetermined procedure will be performed, and base station #1 of 901_1 and terminal #3 of 902_3 will communicate. This is because "interference between terminal #3's Sectus Sweep Reference Signal 1401_3 and terminal #2's Sectus Sweep Reference Signal 1401_2 transmitted by terminal #2 of 902_2 in Figure 21A can be avoided."

[0294] By doing so, collisions of sectus sweep reference signals transmitted by each terminal can be further reduced, which increases the number of sectus sweep reference signals that the base station can receive, and thus increases the number of terminals that the base station can communicate with.

[0295] As described above in Embodiment 1, the terminal can improve the communication capacity of the system composed of the base station and the terminal by transmitting a reference signal for sectus sweeping in such a way that the number of collisions is reduced. Note that the configuration of the terminal and base station is not limited to the configurations shown in Figures 1A, 1B, and 1C. Also, the configuration of the transmitting panel antenna and receiving panel antenna is not limited to the configurations shown in Figures 3 and 4; for example, any antenna configuration that can generate one or more transmitting and receiving directivity patterns is acceptable. Furthermore, 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; the function of the transmitted signal itself is what is important.

[0296] (Embodiment 2) In this second embodiment, as a modification of the first embodiment, an example is described in which the terminal performs single-carrier transmission. Note that the diagrams shown in the first embodiment may be referenced in the following description of the second embodiment.

[0297] Figures 1A, 1B, and 1C show examples of the configuration of a base station, access point, terminal, and repeater in this second embodiment. Detailed explanations of their operation have already been provided using Figures 2, 3, 4, 5, 6, 7, and 8, so further explanations will be omitted. Similarly, detailed explanations of Figures 2, 3, 4, 5, 6, 7, and 8 have already been provided, so further explanations will be omitted.

[0298] Figure 9 shows an example of the communication state in this embodiment. As shown in Figure 9, consider the 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 the base station and the terminals is not limited to this example; for example, a base station may communicate with one or more terminals.

[0299] In the following explanation, we will describe an example where the base station uses OFDMA to transmit a modulated signal to the terminal, and the terminal uses a single-carrier scheme to transmit a modulated signal to the base station.

[0300] Figure 10 shows an example of the modulated signal 1000 transmitted by base station #1 of 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.

[0301] The time interval from time t1 to t2 is the terminal response interval. The terminal response will be explained later.

[0302] A feedback signal 1002 exists during the time interval from time t2 to t3. The feedback signal 1002 will be explained later.

[0303] Frame 1003, which contains data symbols, exists in the time interval from time t4 to t5. Frame 1003, which contains data symbols, will be explained later.

[0304] In Figure 10, the reference signal 1001 for sectus sweep is used, but this is not the only name it can be called. It may also be called a reference signal, reference symbol, training signal, training symbol, reference signal, reference symbol, etc. Similarly, the feedback signal 1002 is used, but this is not the only name it can be called. It may also be called a feedback symbol, signal to the terminal, symbol to the terminal, control signal, control symbol, etc. Finally, the frame 1003 containing data symbols is used, but this is not the only name it can be called. It may also be called a frame containing slots, minislots, units, etc.

[0305] Figure 11 shows an example of the reference signal 1001 for a sector sweep in Figure 10 transmitted by base station #1 of 901_1 in Figure 9, which has the configuration of Figures 1A, 1B, and 1C. In Figure 11, the horizontal axis represents time and the vertical axis represents frequency. In the example in Figure 11, base station #1 of 901_1 transmits a modulated signal based on OFDMA, and is therefore divided into frequency bands ♭1, ♭2, ..., and ♭K, as shown in Figure 11. K is an integer greater than or equal to 1, or an integer greater than or equal to 2.

[0306] For example, in frequency band ♭1, the first time interval contains the sectus sweep reference signal 1101_11 for the transmitting panel antenna 1 for frequency ♭1, the second time interval contains the sectus sweep reference signal 1101_12 for the transmitting panel antenna 2 for frequency ♭1, ..., and the M time interval contains the sectus sweep reference signal 1101_1M for the transmitting panel antenna M for frequency ♭1.

[0307] Therefore, in the frequency band ♭i, the first time interval contains the sectus sweep reference signal 1101_i1 for the transmitting panel antenna 1 for frequency ♭i, the second time interval contains the sectus sweep reference signals 1101_i2, ... for the transmitting panel antenna 2 for frequency ♭i, and the M time interval contains the sectus sweep reference signal 1101_iM for the transmitting panel antenna M for frequency ♭i. Note that i is an integer between 1 and K, inclusive.

[0308] The reference signal 1101_ij for the sectus sweep at the transmitting panel antenna j for frequency ♭i will be transmitted from the transmitting panel antenna j of base station #1 of 901_1, which has the configurations shown in Figures 1A, 1B, and 1C. In this case, j will be an integer between 1 and M, inclusive.

[0309] One notable feature in Figure 11 is that, in the i-th time interval, the reference signal for the sectus sweep is transmitted from the same transmitting panel antenna, regardless of the frequency band. In this case, the same beamforming parameters are used in the first time period, regardless of the frequency band. Beamforming will be explained later.

[0310] Figure 12 shows an example configuration of the "reference signal 1101_pi for sectus sweep in the transmitting panel antenna i for frequency ♭p" shown in Figure 11. In Figure 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.

[0311] A specific example of the transmission method for the "reference signal 1101_pi for sectus sweep at the transmitting panel antenna i for frequency ♭p" (as shown in Figures 11 and 12) transmitted by base station #1 of 901_1, which has the configurations shown in Figures 1A, 1B, and 1C, has already been explained, so the explanation will be omitted here.

[0312] As shown in Figures 11 and 12, when base station #1 of 901_1 transmits the "reference signal 1101_i for sectus sweep on the transmitting panel antenna i for frequency ♭p", the "reference signal 1201_j for the jth parameter on the transmitting panel antenna i for frequency ♭p" is assumed to include, for example, the following information. • The ID (identification number) of the transmitting panel antenna (for example, this corresponds to 'i') • Identification number (ID) of the parameter used in beamforming (directional control) (here, for example, equivalent to j) • When the terminal transmits a reference signal for secta sweeping, the number of time divisions for which the reference signal for secta sweeping can be transmitted (this will be explained later).

[0313] Furthermore, the "reference signal 1201_j based on the jth parameter in the transmitting panel antenna i for frequency ♭p" may include the following information. • Information regarding the frequency band and / or frequency ♭p (which may include information on the number of frequency divisions) (this will be explained later).

[0314] When base station #1 of 901_1 transmits the "ID (identification number) of the transmitting panel antenna for frequency ♭p" and the "ID (identification number) of the parameters used for beamforming (directional control)," the terminal can learn the "ID (identification number) of the transmitting panel antenna" and the "ID (identification number) of the parameters used for beamforming (directional control)" that it has received. This allows base station #1 of 901_1 and the terminal to perform appropriate control, resulting in improved data reception quality.

[0315] Furthermore, the "number of time divisions to which a reference signal for secta sweep can be transmitted when a terminal transmits a reference signal for secta sweep" may be changed by frames and / or time. This can improve the data transmission efficiency of the communication system.

[0316] Furthermore, when base station #1 of 901_1 transmits "information regarding the frequency band and / or frequency ♭p," terminals can obtain this information and transmit "frequency-related information they want the base station to send" to the base station. This allows the base station to perform optimal control, resulting in improved data reception quality.

[0317] Next, we will explain the operation of the time interval from time t1 to t2, which is the terminal response interval in Figure 10. In this embodiment 2, as an example, we will explain the case where the terminal transmits signals using a single-carrier system, and there are some overlapping frequencies (bands) between the frequencies (bands) used by the base station and the frequencies (bands) used by the terminal.

[0318] Figure 23 shows an example of operation during 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 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 9 transmit a reference signal for sect sweeping during the time interval from time t1 to t2, which is the terminal response interval. In Figure 23, terminals that operate in the same way as in Figures 10 and 13 are given the same numbers.

[0319] As shown in Figures 10 and 23, for example, base station #1 of 901_1 transmits a sectus sweep reference signal in the time interval from time t0 to t1. Subsequently, in the terminal response interval, which is the time interval from time t1 to t2, there are assumed to be the following terminal "sectus sweep reference signal" transmission sections 1301_1, 2, 3, 4, 5, 6, 7, and 8, respectively, as shown in Figure 13.

[0320] Therefore, in the case of Figure 23, the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep is set to 8 by base station #1 of 901_1.

[0321] Figure 24 shows an example of terminal occupation in the first transmission section 1301_1, the second transmission section 1301_2, the third transmission section 1301_3, the fourth transmission section 1301_4, the fifth transmission section 1301_5, the sixth transmission section 1301_6, the seventh transmission section 1301_7, and the eighth transmission section 1301_8 of the terminal "Sectus Sweep Reference Signal" shown in Figure 23. In Figure 24, the horizontal axis represents time.

[0322] Terminal #1 of 902_1 in Figure 9 receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1, and estimates the frequency band, transmitting panel antenna, and parameter number of the transmitting panel antenna of base station #1 of 901_1 that has good reception quality. This estimation can be performed by obtaining the secta sweep reference signal 1001 and the ID (identification number) of the transmitting panel antenna and the ID of the parameter used for beamforming (directional control) contained therein. Alternatively, information regarding the frequency band and / or frequency ♭p contained in the secta sweep reference signal 1001 may also be used.

[0323] Terminal #1 of 902_1 is assumed to have estimated the "transmitting panel antenna and parameters" with good reception quality to be, for example, "transmitting panel antenna a1 and parameter b1". Furthermore, terminal #1 of 902_1 is assumed to have estimated the "frequency domain" with good reception quality to be the frequency band ♭K.

[0324] Furthermore, terminal #1 of 902_1 estimates the "transmitting panel antenna and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 24, terminal #1 of 902_1 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 8.

[0325] In this case, terminal #1 of 902_1 uses a random number to obtain one of the following values: "0", "1", "2", "3", "4", "5", "6", or "7". 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 "Sectus Sweep Reference Signal" 2401_1 using the "Terminal Sectus Sweep Reference Signal" 1st (= "0" + 1) transmission section 1301_1" in Figure 24. Note that here, a random number is used to set the transmission section of the Sectus Sweep Reference Signal, but instead of a random number, the transmission section of the Sectus 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 uniquely held by the terminal. Therefore, setting the transmission interval for the secta sweep reference signal is not limited to the example above; for example, the transmission interval for the secta sweep reference signal can be set for each terminal. This point can also be applied to the following similar explanation.

[0326] Furthermore, terminal #1's "Secta Sweep Reference Signal" 2401_1 is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #1 of 902_1, specifically, information on "transmitting panel antenna a1 and parameter b1". In addition, terminal #1's "Secta Sweep Reference Signal" 2401_1 is assumed to contain information on the "frequency domain," such as "frequency band ♭K". This point will be explained later.

[0327] Similarly, terminal #2 of 902_2 in Figure 9 receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1, and estimates the frequency band, transmitting panel antenna, and parameter number of the transmitting panel antenna of base station #1 of 901_1 that has good reception quality. This estimation can be performed by obtaining the secta sweep reference signal 1001 and the ID (identification number) of the transmitting panel antenna and the ID of the parameter used for beamforming (directional control) contained therein. Alternatively, information regarding the frequency band and / or frequency ♭p contained in the secta sweep reference signal 1001 may also be used.

[0328] Terminal #2 of 902_2 is assumed to have estimated the "transmitting panel antenna and parameters" with good reception quality to be, for example, "transmitting panel antenna a2 and parameter b2". Also, terminal #2 of 902_2 is assumed to have estimated the "frequency domain" with good reception quality to be frequency band ♭1.

[0329] Furthermore, terminal #2 of 902_2 estimates the "transmitting panel antenna and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 24, terminal #2 of 902_2 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 8.

[0330] In this case, terminal #2 of 902_2 uses a random number to obtain one of the following values: "0", "1", "2", "3", "4", "5", "6", or "7". For example, suppose terminal #2 of 902_2 obtains "5" using a random number. In this case, "5" + 1 = 6, so terminal #2 of 902_2 transmits terminal #2 "Sectus Sweep Reference Signal" 2401_2 using the "Terminal "Sectus Sweep Reference Signal" No. 6 (= "5" + 1) Transmission Section 1301_6" in Figure 24.

[0331] Furthermore, terminal #2's "reference signal for secta sweep" 1401_2 is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, namely, information on "transmitting panel antenna a2 and parameter b2". In addition, terminal #2's "reference signal for secta sweep" 2401_2 will contain information on the "frequency domain," such as "frequency band ♭1". This point will be explained later.

[0332] Therefore, terminal #i of 902_i receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1 and estimates the "frequency band, transmitting panel antenna, and parameter number" of the transmitting panel antenna of base station #1 of 901_1 that has good reception quality. This estimation can be performed by obtaining the secta sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "identification number (ID) of the parameter used for beamforming (directional control)" contained therein. For example, i is an integer of 1 or more. Alternatively, information regarding the "frequency band and / or frequency ♭p" contained in the secta sweep reference signal 1001 may also be used.

[0333] Terminal #i of 902_i is assumed to be estimated as a "transmitting panel antenna and parameters" with good reception quality, for example, "transmitting panel antenna ai and parameter bi". Also, terminal #i of 902_i is assumed to be estimated as the frequency band ♭zi with good reception quality.

[0334] Furthermore, terminal #i of 902_i estimates the "transmitting panel antenna and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 24, terminal #i of 902_i obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 8.

[0335] In this case, terminal #i of 902_i uses a random number to obtain one of the following values: "0", "1", "2", "3", "4", "5", "6", or "7". For example, suppose terminal #i of 902_i obtains "yi" using a random number. Note that yi will be one of the following values: "0", "1", "2", "3", "4", "5", "6", or "7". In this case, terminal #i of 902_i transmits terminal #i "Secta Sweep Reference Signal" 2401_i using the terminal "Secta Sweep Reference Signal" transmission section 1301_("yi"+1) shown in Figure 24.

[0336] Furthermore, terminal #i, "reference signal for sectus sweep" 2401_i, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #i of 902_i, namely, information on "transmitting panel antenna ai and parameter bi". In addition, terminal #i, "reference signal for sectus sweep" 2401_i, is assumed to contain information on the "frequency domain," such as "frequency band ♭p". This point will be explained later.

[0337] In Figure 24, terminal #i "reference signal for sectus sweep" 2401_i may be considered to be using a first frequency (band) regardless of i as the first method. In this case, terminal #i "reference signal for sectus sweep" 2401_i is time-division multiplexed (Time Division Multiple Access: TDMA). This is because the terminal is transmitting the modulated signal using a single-carrier method.

[0338] A second method is to not necessarily use the same frequency (band) as the terminal #i "reference signal for secta sweep" 2401_i.

[0339] Both the first and second methods have the effect of "reducing interference from terminal #i 'reference signal for sectus sweep' 2401_i".

[0340] 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 single-carrier modulated signal using "frequency band ♭1 to frequency band ♭K".

[0341] Alternatively, 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 single-carrier modulated signal using a portion of "frequency band ♭1 to frequency band ♭K".

[0342] Alternatively, base station #1 of 901_1 may transmit a modulated signal using the frequency band ♭1 to ♭K, as described in Embodiment 1, while terminal #i of 902_i may transmit a modulated signal using a different frequency (band) than the frequency band ♭1 to ♭K.

[0343] By doing so, collisions of sectus sweep reference signals transmitted by each terminal can be reduced, thereby increasing the number of sectus sweep reference signals that the base station can receive, and thus increasing the number of terminals that the base station can communicate with.

[0344] The configuration of terminal #i "Sectus Sweep Reference Signal" 2401_i transmitted by terminal #i of 902_i, as explained using Figure 24, will now be described. For the sake of simplicity, terminal #i of 902_i will be assumed to have the configurations shown in Figures 1A, 1B, and 1C. Furthermore, terminal #i of 902_i having the configurations shown in Figures 1A, 1B, and 1C will be assumed to have the configuration shown in Figure 3 as the transmitting panel antenna xi of 106_xi. However, the configuration of terminal #i of 902_i is not limited to the configurations shown in Figures 1A, 1B, and 1C, and the configuration of the transmitting panel antenna xi of terminal #i of 106_xi having the configurations shown in Figures 1A, 1B, and 1C is not limited to Figure 3.

[0345] The difference from Embodiment 1 is that terminal #i of 902_i transmits a single-carrier modulated signal, and the specific configuration has already been explained in Embodiment 1.

[0346] Terminal #i of 902_i will transmit terminal #i "Sectus Sweep Reference Signal" 2401_i, as shown in Figure 24. Figure 15A shows an example of the configuration of terminal #i "Sectus Sweep Reference Signal" 2401_i. In Figure 15A, the horizontal axis represents time. Also, "Terminal #i "Sectus Sweep Reference Signal" 1401_i" in Figure 15A corresponds to an example of "Sectus Sweep Reference Signal" 2401_i in Figure 24.

[0347] As shown in Figure 15A, terminal #i "Sectus sweep reference signal" 2401_i of 902_i is assumed to consist of "Sectus sweep reference signal 1501_1 at terminal #i transmitting panel antenna 1, Sectus sweep reference signal 1501_2 at terminal #i transmitting panel antenna 2, ..., Sectus sweep reference signal 1501_M at terminal #i transmitting panel antenna M".

[0348] For example, terminal #i of 902_i, having the configurations shown in Figures 1A, 1B, and 1C, transmits the "reference signal 1501_1 for sectus sweep at terminal #i's transmitting panel antenna 1" using the transmitting panel antenna 1 of 106_1.

[0349] Therefore, terminal #i of 902_i, having the configurations shown in Figures 1A, 1B, and 1C, transmits the "reference signal 1501_k for sectus sweep at terminal #i's transmitting panel antenna k" using the transmitting panel antenna k of 106_k. Note that k is an integer between 1 and M, inclusive.

[0350] In Figure 15A, the number of transmitting panel antennas owned by terminal #i of 902_i is denoted as M, but this is not the only option; the number of transmitting panel antennas may also be denoted as N. (N shall be an integer greater than or equal to 1.)

[0351] Figure 15B shows an example configuration of "reference signal 1501_xi for sectus sweep at terminal #i transmitting panel antenna xi" in Figure 15A. Note that in Figure 15, the horizontal axis represents time.

[0352] The "reference signal 1501_xi for sectus sweep at terminal #i transmitting panel antenna xi" is assumed to consist of, for example, "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", as shown in Figure 15B.

[0353] For example, let's assume that terminal #i of 902_i, which has the configurations shown in Figures 1A, 1B, and 1C, has the configuration shown in Figure 3 as the transmitting panel antenna xi of 106_xi.

[0354] This section describes "Reference signal 1511_1 based on the first parameter in the transmitting panel antenna xi".

[0355] When terminal #i of 902_i transmits the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_1 at the transmitting panel antenna xi of 106_xi to w1(xi,1). If the first transmitting signal 303_1 in the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" is tx1ref1(t), then the multiplier unit 304_1 obtains tx1ref1(t) × w1(xi,1). Then, terminal #i of 902_i transmits tx1ref1(t) × w1(xi,1) from antenna 306_1 in Figure 3. Note that t is time.

[0356] When terminal #i of 902_i transmits the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_2 at the transmitting panel antenna xi of 106_xi to w2(xi,1). If the second transmitting signal 303_2 in the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" is tx2ref1(t), then the multiplier unit 304_2 obtains tx2ref1(t) × w2(xi,1). Then, terminal #i of 902_i transmits tx2ref1(t) × w2(xi,1) from antenna 306_2 in Figure 3.

[0357] When terminal #i of 902_i transmits the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_3 at the transmitting panel antenna xi of 106_xi to w3(xi,1). If the third transmitting signal 303_3 in the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" is tx3ref1(t), then the multiplier unit 304_3 obtains tx3ref1(t) × w3(xi,1). Then, terminal #i of 902_i transmits tx3ref1(t) × w3(xi,1) from antenna 306_3 in Figure 3.

[0358] When terminal #i of 902_i transmits the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_4 at the transmitting panel antenna xi of 106_xi to w4(xi,1). If the fourth transmitting signal 303_4 in the "reference signal 1511_1 based on the first parameter at the transmitting panel antenna xi" is tx4ref1(t), then the multiplier unit 304_4 obtains tx4ref1(t) × w4(xi,1). Then, terminal #i of 902_i transmits tx4ref1(t) × w4(xi,1) from antenna 306_4 in Figure 3.

[0359] This section explains the "reference signal 1511_j based on the jth parameter in the transmitting panel antenna xi".

[0360] When terminal #i of 902_i transmits the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_1 at the transmitting panel antenna xi of 106_xi to w1(xi,j). If the first transmitting signal 303_1 in the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" is tx1refj(t), then the multiplier unit 304_1 obtains tx1refj(t) × w1(xi,j). Then, terminal #i of 902_i transmits tx1refj(t) × w1(xi,j) from antenna 306_1 in Figure 3. Note that t is time.

[0361] When terminal #i of 902_i transmits the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_2 at the transmitting panel antenna xi of 106_xi to w2(xi,j). If the second transmitting signal 303_2 in the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" is tx2refj(t), then the multiplier unit 304_2 obtains tx2refj(t) × w2(xi,j). Then, terminal #i of 902_i transmits tx2refj(t) × w2(xi,j) from antenna 306_2 in Figure 3.

[0362] When terminal #i of 902_i transmits the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_3 at the transmitting panel antenna xi of 106_xi to w3(xi,j). If the third transmitting signal 303_3 in the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" is tx3refj(t), then the multiplier unit 304_3 obtains tx3refj(t) × w3(xi,j). Then, terminal #i of 902_i transmits tx3refj(t) × w3(xi,j) from antenna 306_3 in Figure 3.

[0363] When terminal #i of 902_i transmits the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" shown in Figure 15B, terminal #i of 902_i sets the multiplication coefficient of the multiplier unit 304_4 at the transmitting panel antenna xi of 106_xi to w4(xi,j). If the fourth transmitting signal 303_4 in the "reference signal 1511_j based on the j-th parameter at the transmitting panel antenna xi" is tx4refj(t), then the multiplier unit 304_4 obtains tx4refj(t) × w4(xi,j). Then, terminal #i of 902_i transmits tx4refj(t) × w4(xi,j) from antenna 306_4 in Figure 3.

[0364] In Figure 15B, j is an integer between 1 and 4. While Figure 15B shows the parameter change Z as Z=4, the parameter change Z is not limited to 4; it can be performed similarly if Z is an integer greater than or equal to 1 or 2. In this case, j is an integer between 1 and 4.

[0365] As shown in Figures 24, 15A, and 15B, when terminal #i of 902_i transmits the "reference signal 1501_xi for sect sweep at terminal #i's transmitting panel antenna xi", the "reference signal 1511_j based on the jth parameter at the transmitting panel antenna xi" is assumed to include, for example, the following information. As mentioned above, information on the "transmitting panel antenna and parameters" of base station #1 of 901_1, which has good reception quality.

[0366] 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 the "reference signal 1501_1 for sect sweep at terminal #i transmitting panel antenna 1", "reference signal 1501_2 for sect sweep at terminal #i transmitting panel antenna 2", ..., "reference signal 1501_M for sect sweep at terminal #i transmitting panel antenna M" in Figure 15A.

[0367] Furthermore, in Figure 15A, "Reference signal 1501_1 for sectus sweep at terminal #i transmitting panel antenna 1", "Reference signal 1501_2 for sectus sweep at terminal #i transmitting panel antenna 2", ..., "Reference signal 1501_M for sectus sweep at terminal #i transmitting panel antenna M", in Figure 15B, "Reference signal 1511_1 for the first parameter at transmitting panel antenna xi", "Reference signal 1511_2 for the second parameter at transmitting panel antenna xi", "Reference signal 1511_3 for the third parameter at transmitting panel antenna xi", and "Reference signal 1511_4 for the fourth parameter at transmitting panel antenna xi", 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".

[0368] In this case, base station #1 of 901_1 is more likely to receive any of the "reference signal 1501_1 for sect sweep at terminal #i transmitting panel antenna 1", "reference signal 1501_2 for sect sweep at terminal #i transmitting panel antenna 2", ..., "reference signal 1501_M for sect sweep at terminal #i transmitting panel antenna M" transmitted by terminal #i of 902_i, even if it uses an omnidirectional antenna. This is because terminal #i of 902_i is performing transmit beamforming (directional control). As a result, base station #1 of 901_1 is more likely to obtain "information on the transmit panel antenna and parameters of base station #1 of 901_1 with good reception quality" transmitted by terminal #i of 902_i. Therefore, the base station #1 of 901_1 can transmit a modulated signal to terminal #i of 902_i based on "information on the transmitting panel antenna and parameters of base station #1 of 901_1, which has good reception quality," and terminal #i of 902_i can receive the modulated signal with high reception quality.

[0369] Furthermore, as shown in Figure 24, if multiple terminals are transmitting a reference signal for sect sweeping, 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 multiple terminals. As a result, base station #1 of 901_1 can transmit a modulated signal to 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 multiple terminals, and multiple terminals can receive the modulated signal with high reception quality.

[0370] Furthermore, as shown in Figures 24, 15A, and 15B, when terminal #i of 902_i transmits the "reference signal 1501_xi for sect sweep at terminal #i's transmitting panel antenna xi", the "reference signal 1511_j based on the jth parameter at the transmitting panel antenna xi" may include, for example, the following information. • Transmitting panel antenna ID (identification number) (Here, for example, this corresponds to xi) • Identification number (ID) of the parameter used in beamforming (directional control) (here, for example, equivalent to j)

[0371] When terminal #i of 902_i transmits the "transmitting panel antenna ID (identification number)" and the "identification number (ID) of the parameters used for beamforming (directional control)," base station #1 of 901_1 can learn the "transmitting panel antenna ID (identification number)" and the "identification number (ID) of the parameters used for beamforming (directional control)" that it received. This allows terminal #i of 902_i and base station #1 of 901_1 to perform appropriate control, resulting in improved data reception quality.

[0372] Then, as shown in Figures 24, 15A, and 15B, when terminal #i of 902_i transmits the "reference signal 1501_xi for sect sweep at terminal #i's transmitting panel antenna xi", the "reference signal 1511_j based on the jth parameter at the transmitting panel antenna xi" may include, for example, the following information. • Information regarding the frequency band and / or frequency ♭p used by terminal #i of 902_i for transmission, or to be used by base station #1 of 901_1.

[0373] When terminal #i of 902_i transmits the "information regarding the frequency band and / or frequency ♭p", base station #1 of 901_1 can learn about the "information regarding the frequency band and / or frequency ♭p", enabling terminal #i of 902_i and base station #1 of 901_1 to perform appropriate control, thereby improving the quality of data reception.

[0374] Figure 16A shows an example of the configuration of the feedback signal 1002 transmitted by base station #1 of 901_1 during the time interval from t2 to t3 in Figure 10. In Figure 16A, the horizontal axis represents time and the vertical axis represents frequency. In this example, as shown in Figure 16A, the feedback signal 1002 is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section. The feedback signal 1002 may also have a configuration in which there are Ω transmission sections, where Ω is an integer of 1 or more or an integer of 2 or more.

[0375] Furthermore, in Figure 16A, the feedback signal 1002 is assumed to have frequency bands ♭1, ♭2, ..., and ♭K.

[0376] Therefore, the first transmission section will contain the first transmission section 1601_11 for frequency ♭1, the first transmission section 1601_21 for frequency ♭2, ..., and the first transmission section 1601_K1 for frequency ♭K. Similarly, the second transmission section will contain the second transmission section 1601_12 for frequency ♭1, the second transmission section 1601_22 for frequency ♭2, ..., and the second transmission section 1601_K2 for frequency ♭K. The third transmission section will contain the third transmission section 1601_13 for frequency ♭1, the third transmission section 1601_23 for frequency ♭2, ..., and the third transmission section 1601_K3 for frequency ♭K. The fourth transmission section will contain the feedback signal fourth transmission section 1601_14 for frequency ♭1, the feedback signal fourth transmission section 1601_24 for frequency ♭2, ..., and the feedback signal fourth transmission section 1601_K4 for frequency ♭K.

[0377] One notable feature of Figure 16A is that, in the i-th time interval, the feedback signal is transmitted from the same transmitting panel antenna, regardless of the frequency band.

[0378] Figure 16B shows an example of a specific feedback signal assignment for the feedback signal 1002 shown in Figure 16A.

[0379] For example, as shown in Figure 24, terminal #1 of 902_1 transmits terminal #1 "Sectus Sweep Reference Signal" 2401_1, terminal #2 of 902_2 transmits terminal #2 "Sectus Sweep Reference Signal" 2401_2, terminal #3 of 902_3 transmits terminal #3 "Sectus Sweep Reference Signal" 2401_3, and other terminals also transmit Sectus Sweep Reference Signals.

[0380] Furthermore, it is assumed that terminal #1's "reference signal for sectus sweep" 2401_1 contains the information that "the reception quality in frequency band ♭K is good." Therefore, base station #1 of 901_1 transmits a feedback signal 1611_1 addressed to terminal #1 using frequency band ♭K, as shown in Figure 16B.

[0381] Terminal #2's "Secta Sweep Reference Signal" 2401_2 is assumed to contain information indicating that "the reception quality in frequency band ♭1 is good." Therefore, base station #1 of 901_1 transmits a feedback signal 1611_2 to terminal #2 using frequency band ♭1, as shown in Figure 16B.

[0382] Terminal #3's "Secta Sweep Reference Signal" 2401_3 is assumed to contain information indicating "good reception quality in frequency bands ♭1 and ♭2." Therefore, base station #1 of 901_1 transmits a feedback signal 1611_3 to terminal #3 using frequency bands ♭1 and ♭2, as shown in Figure 16B.

[0383] Terminal #4's "Secta Sweep Reference Signal" (not shown in Figure 24) is assumed to contain information indicating that "the reception quality in frequency band ♭2 is good." Therefore, base station #1 of 901_1 transmits feedback signal 1611_4 to terminal #4 using frequency band ♭2, as shown in Figure 16B.

[0384] Terminal #5's "reference signal for sectus sweep" (not shown in Figure 24) is assumed to contain information indicating that "the reception quality in frequency band ♭2 is good." Therefore, base station #1 of 901_1 transmits feedback signal 1611_5 to terminal #5 using frequency band ♭2, as shown in Figure 16B.

[0385] Terminal #6's "Secta Sweep Reference Signal" (not shown in Figure 24) is assumed to contain information indicating "good reception quality in frequency band ♭K". Therefore, base station #1 of 901_1 transmits feedback signal 1611_6 to terminal #6 using frequency band ♭K, as shown in Figure 16B.

[0386] In this way, terminal #i of 902_i can receive feedback signal 1611_i addressed to terminal #i, thereby knowing that communication with base station #1 of 901_1 has become possible, and also knowing the frequency band to be used. Note that Figure 16B is merely an example; 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 was not established.

[0387] In this case, the feedback signal 1611_i addressed to terminal #i is assumed to contain information such as, for example, that communication with terminal #i of 902_i is possible (or that frame 1003 containing the data symbol in Figure 10 contains a symbol addressed to terminal #i of 902_i).

[0388] Furthermore, based on the information transmitted by terminal #i of 902_i regarding the frequency band, transmitting panel antenna, and parameters of base station #1 of 901_1, which has good reception quality, base station #1 of 901_1 will select the frequency band and transmitting panel antenna, set the beamforming parameters, and transmit the feedback signal 1611_i to terminal #i.

[0389] Figure 17A shows an example of the configuration of frame 1003 containing data symbols transmitted by base station #1 of 901_1, which exists in the time interval from t4 to t5 in Figure 10. In Figure 17A, the horizontal axis represents time and the vertical axis represents frequency. In this example, as shown in Figure 17A, frame 1003 containing data symbols is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section. Alternatively, frame 1003 containing data symbols may have Ω transmission sections, where Ω is an integer greater than or equal to 1 or greater than or equal to 2.

[0390] Furthermore, in Figure 17A, frame 1003 containing data symbols is assumed to have frequency bands ♭1, ♭2, ..., and ♭K.

[0391] Therefore, the first transmission section contains the modulation signal (slot) for frequency ♭1, 1701_11, the modulation signal (slot) for frequency ♭2, 1701_21, ..., and the modulation signal (slot) for frequency ♭K, 1701_K1. Similarly, the second transmission section contains the modulation signal (slot) for frequency ♭1, 2701_12, the modulation signal (slot) for frequency ♭2, 1701_22, ..., and the modulation signal (slot) for frequency ♭K, 1701_K2. The third transmission section contains the modulation signal (slot) for frequency ♭1, 3701_13, the modulation signal (slot) for frequency ♭2, 3701_23, ..., and the modulation signal (slot) for frequency ♭K, 3701_K3. The fourth transmission section will contain the modulation signal (slot) for frequency ♭1, the modulation signal (slot) for frequency ♭2, the modulation signal (slot) for frequency ♭K, and the modulation signal (slot) for frequency ♭K, the modulation signal (slot) for frequency ♭K4.

[0392] Figure 17B shows an example of a specific modulation signal (slot) assignment for frame 1003 containing the data symbols shown in Figure 17A.

[0393] As shown in the example in Figure 24, terminal #1 of 902_1 transmits terminal #1 "Sectus Sweep Reference Signal" 2401_1, terminal #2 of 902_2 transmits terminal #2 "Sectus Sweep Reference Signal" 2401_2, terminal #3 of 902_3 transmits terminal #3 "Sectus Sweep Reference Signal" 2401_3, terminal #4 of 902_4 transmits terminal #4 "Sectus Sweep Reference Signal" (not shown in Figure 24), terminal #5 of 902_5 transmits terminal #5 "Sectus Sweep Reference Signal" (not shown in Figure 24), and terminal #6 of 902_6 transmits terminal #6 "Sectus Sweep Reference Signal" (not shown in Figure 24).

[0394] Furthermore, it is assumed that terminal #1's "reference signal for sectus sweep" 2401_1 contains the information that "the reception quality of frequency band ♭K is good." Therefore, base station #1 of 901_1 transmits the modulated signal (slot) 1711 addressed to terminal #1 using frequency band ♭K, as shown in Figure 17B.

[0395] Terminal #2's "Secta Sweep Reference Signal" 2401_2 is assumed to contain information indicating "good reception quality in frequency band ♭1". Therefore, base station #1 of 901_1 transmits the modulated signal (slot) 1712 addressed to terminal #2 using frequency band ♭1, as shown in Figure 17B.

[0396] Terminal #3's "Secta Sweep Reference Signal" 2401_3 is assumed to contain information indicating "good reception quality in frequency bands ♭1 and ♭2." Therefore, base station #1 of 901_1 transmits the modulated signal (slot) 1713 addressed to terminal #3 using frequency bands ♭1 and ♭2, as shown in Figure 17B.

[0397] Terminal #4's "reference signal for sectus sweep" (not shown in Figure 24) is assumed to contain the information that "frequency band ♭2 reception quality is good." Therefore, base station #1 of 901_1 transmits the modulated signal (slot) 1714 addressed to terminal #4 using frequency band ♭2, as shown in Figure 17B.

[0398] Terminal #5's "reference signal for sectus sweep" (not shown in Figure 24) is assumed to contain the information that "frequency band ♭2 reception quality is good." Therefore, base station #1 of 901_1 transmits the modulated signal (slot) 1715 addressed to terminal #5 using frequency band ♭2, as shown in Figure 17B.

[0399] The terminal #6 "reference signal for sectus sweep" (not shown in Figure 24) is assumed to contain the information that "frequency band ♭K reception quality is good". Therefore, base station #1 of 901_1 transmits the modulated signal (slot) 1716 addressed to terminal #6 using the frequency band ♭K, as shown in Figure 17B.

[0400] In this case, the modulated signal (slot) 171i addressed to terminal #i is assumed to contain, for example, a data symbol (data, information) addressed to terminal #i, such as 902_i.

[0401] In this way, terminal #i of 902_i can know that communication with base station #1 of 901_1 has become possible via the 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; for example, if the modulated signal (slot) 1711 addressed to terminal #1 does not exist as frame 1003 containing data symbols, terminal #1 of 902_1 will know that communication with base station #1 of 901_1 was not established.

[0402] Based on the information transmitted by terminal #i of 902_i regarding the frequency band, transmitting panel antenna, and parameters of base station #1 of 901_1, which has good reception quality, base station #1 of 901_1 will select the frequency band and transmitting panel antenna, set the beamforming parameters, and transmit the modulated signal (slot) 171i addressed to terminal #i.

[0403] In addition, in Figures 16A and 16B, base station #1 of 901_1 receives the terminal #i "Sectus Sweep Reference Signal" 2401_i transmitted by terminal #i of 902_i, estimates the frequency (band) and transmitting panel antenna and parameters of terminal #i of 902_1 with good reception quality, and this information may be included in the feedback signal 1611_i addressed to terminal #i.

[0404] As a result, terminal #i of 902_i selects a frequency band and transmitting panel antenna, determines a beamforming method, and transmits symbols, frames, and / or modulated signals to base station #1 of 901_1 based on the information obtained from base station #1 of 901_1 regarding the frequency band, transmitting panel antenna, and parameters of terminal #i of 902_i with good reception quality. This results in improved data reception quality at base station #1 of 901_1.

[0405] Furthermore, in the time interval from t3 to t4 in Figure 10, terminal #i of 902_i may transmit a modulated signal to base station #1 of 901_1 that includes information such as an ACK (acknowledgement) indicating that it was able to receive the signal from base station #1 of 901_1.

[0406] In addition to data symbols, the modulated signal (slot) 171i addressed to terminal #i in Figure 17B may also include, for example, reference signals such as DMRS (demodulation reference signal), PTRS (phase tracking reference signal), and SRS (sounding reference signal), pilot symbols, pilot signals, preambles, and symbols containing control information. The symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and information about the MCS (Modulation and Coding Scheme).

[0407] Figure 18 shows an example of the situation when base station #1 of 901_1 is communicating 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," as shown in Figure 9. Figure 18(A) shows an example of the transmission status of modulated signals from base station #1 of 901_1, and Figure 18(B) shows an example of the transmission status of modulated signals 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." Note that in Figures 18(A) and 18(B), the horizontal axis represents time.

[0408] First, base station #1 of 901_1 transmits the reference signal 1801_1 for secta sweep. This point has already been explained using Figure 10, so the explanation will be omitted here.

[0409] 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 the secta sweep reference signal 1851_1. This point has already been explained using Figures 23, 24, 15A, and 15B, so the explanation will be omitted here.

[0410] Base station #1 of 901_1 transmits feedback signal 1802_1. This point has already been explained using Figures 16A and 16B, so the explanation will be omitted here.

[0411] Subsequently, base station #1 of 901_1 transmits "frame 1803_1 containing data symbols." This point has already been explained using Figures 17A and 17B, so the explanation will be omitted here. (Therefore, "frame 1803_1 containing data symbols" can be considered, for example, a downlink frame.)

[0412] 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 containing data symbols." The structure of this frame will be explained later using Figure 25. (Therefore, "frame 1852_1 containing data symbols" can be considered, for example, as an uplink frame.)

[0413] Next, base station #1 of 901_1 transmits "frame 1803_2 containing data symbols". The structure of "frame 1803_2 containing data symbols" is as explained using Figures 17A and 17B.

[0414] 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 containing data symbols". The structure of this frame will be explained later using Figure 25.

[0415] Figure 19 shows examples of the transmission status of modulated signals from base station #1 of 901_1, as well as from Figure 18 onwards, and from the transmission status of modulated signals from terminals such as "terminal #1 of 902_1, terminal #2 of 902_2, terminal #3 of 902_3, terminal #4 of 902_4, terminal #5 of 902_5, and terminal #6 of 902_6".

[0416] Figure 19(A) shows an example of the transmission status of the modulated signal from base station #1 of 901_1, and is a temporal continuation of the transmission status of the modulated signal from base station #1 of 901_1 shown in Figure 18(A).

[0417] Figure 19(B) shows an example of the transmission status of modulated signals for "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 chronological continuation of the transmission status of modulated signals for "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" shown in Figure 18(B).

[0418] In Figures 19(A) and 19(B), the horizontal axis represents time.

[0419] Following Figures 18(A) and (B), base station #1 of 901_1 transmits "frame 1803_3 containing data symbols". The structure of "frame 1803_3 containing data symbols" is as explained using Figures 17A and 17B.

[0420] 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 containing data symbols". The structure of this frame will be explained later using Figure 25.

[0421] Next, base station #1 of 901_1 transmits the reference signal 1801_2 for the secta sweep. This point has already been explained using Figure 10, so the explanation will be omitted here.

[0422] 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 the secta sweep reference signal 1851_2. This point has already been explained using Figures 23, 24, 15A, and 15B, so the explanation will be omitted here.

[0423] Base station #1 of 901_1 transmits feedback signal 1802_2. This point has already been explained using Figures 16A and 16B, so the explanation will be omitted here.

[0424] Subsequently, base station #1 of 901_1 transmits "frame 1803_4 containing data symbols". This point has already been explained using Figures 17A and 17B, so the explanation will be omitted here.

[0425] 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 containing data symbols." The structure of this frame will be explained later using Figure 25.

[0426] Thus, before the transmission of the "frame containing data symbols" by base station #1 of 901_1, and / or the transmission of the "frame containing 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, terminal #6 of 902_6", base station #1 of 901_1 and the terminals transmit a reference signal for sect sweep, and before the transmission of the "frame containing data symbols" by base station #1 of 901_1, and Alternatively, after the transmission of a "frame containing data symbols" 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, Terminal #6 of 902_6", the base station and / or terminals can achieve the effect of obtaining high data reception quality by transmitting a reference signal for sect sweeping again, setting the frequency (band), selecting the transmitting panel antenna to be used, and setting the transmit beamforming.

[0427] Next, we will explain an example of the structure of "frame 1852_i containing 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" using Figure 25. For example, i is assumed to be an integer of 1 or greater, and the horizontal axis in Figure 25 represents time.

[0428] As shown in Figure 25, the "frame 1852_i containing data symbols" is assumed to consist of the first transmission section, the second transmission section, the third transmission section, the fourth transmission section, the fifth transmission section, the sixth transmission section, the seventh transmission section, and the eighth transmission section.

[0429] As shown in Figure 25, for example, terminal #1 of 902_1 transmits terminal #1 transmission frame 2501_1 (including data symbols) using the first transmission interval.

[0430] Terminal #2 of 902_2 transmits terminal #2 transmission frame 2501_2 (including data symbols) using the sixth transmission interval.

[0431] Terminal #3 of 902_3 transmits terminal #3 transmission frame 2501_3 (including data symbols) using the fourth transmission interval.

[0432] Terminal #4 of 902_4 transmits terminal #4 transmission frame 2501_4 (including data symbols) using the second transmission interval.

[0433] Terminal #5 of 902_5 transmits terminal #5 transmission frame 2501_5 (including data symbols) using the 8th transmission interval.

[0434] Terminal #6 of 902_6 transmits terminal #6 transmission frame 2501_6 (including data symbols) using the fifth transmission interval.

[0435] Furthermore, 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" are assumed to be using a single-carrier transmission method. Additionally, multiple terminals may use the same frequency (band).

[0436] In this way, "frame 1852_i containing 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 subjected to time division, for example, with each terminal transmitting a frame and base station #1 of 901_1 receiving the frames transmitted by each terminal. This suppresses interference and allows for high data reception quality.

[0437] In addition to data symbols, the transmission frames 2501_1 for terminal #1, 2501_2 for terminal #2, 2501_3 for terminal #3, 2501_4 for terminal #4, 2501_5 for terminal #5, and 2501_6 for terminal #6 in Figure 25 may also include, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information.

[0438] Figure 25 illustrates the case where frames transmitted by the terminal are time-partitioned, but it is also possible to perform spatial partitioning of frames transmitted by the terminal using MU-MIMO (Multi-User-MIMO (Multiple-Input Multiple-Output)).

[0439] Figure 24 shows an example of the terminal occupation for the "Sectus Sweep Reference Signal for Terminals" 1st transmission section 1301_1, 2nd transmission section 1301_2, 3rd transmission section 1301_3, 4th transmission section 1301_4, 5th transmission section 1301_5, 6th transmission section 1301_6, 7th transmission section 1301_7, and 8th transmission section 1301_8 shown in Figure 23.

[0440] Figure 26 describes an example of terminal occupation for the "Sectus Sweep Reference Signal for Terminals" first transmission section 1301_1, second transmission section 1301_2, third transmission section 1301_3, fourth transmission section 1301_4, fifth transmission section 1301_5, sixth transmission section 1301_6, seventh transmission section 1301_7, and eighth transmission section 1301_8, as shown in Figure 23, which differs from Figure 24.

[0441] In Figure 26, components that operate similarly to those in Figures 23 and 24 are given the same numbers and have already been explained, so their explanations are omitted. The following explains the differences from the explanation in Figure 24.

[0442] Terminal #2 of 902_2 in Figure 9 receives the secta sweep reference signal 1001 transmitted by base station #1 of 901_1, and by obtaining the "frequency (band)" with good reception quality, the "ID (identification) (identification number) of the transmitting panel antenna," and the "identification number (ID) of the parameters used in beamforming (directional control)," it is possible to communicate with base station #1 of 901_1.

[0443] Terminal #2 of 902_2 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a2 and parameter b2".

[0444] Furthermore, terminal #2 of 902_2 estimates the "transmitting panel antenna and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 26, terminal #2 of 902_2 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 8.

[0445] In this case, terminal #2 of 902_2 uses a random number to obtain one of the following values: "0", "1", "2", "3", "4", "5", "6", or "7". For example, suppose terminal #2 of 902_2 obtains "5" using a random number. In this case, "5" + 1 = 6, so terminal #2 of 902_2 transmits terminal #2 "Secta Sweep Reference Signal" 2401_2 using the "Terminal "Secta Sweep Reference Signal" 6th transmission section 1301_6" as shown in Figure 26.

[0446] Furthermore, terminal #2, "reference signal for sectus sweep" 2401_2, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, that is, information on "transmitting panel antenna a2 and parameter b2".

[0447] Terminal #3 of 902_3 in Figure 9 can communicate with base station #1 of 901_1 by receiving the secta sweep reference signal 1001 transmitted by base station #1 of 901_1 and obtaining the "ID (identification number) of the transmitting panel antenna" and the "ID (identification number) of the parameters used in beamforming (directional control)" which have good reception quality.

[0448] Terminal #3 of 902_3 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and is estimated to have a "transmitting panel antenna and parameters" such as "transmitting panel antenna a3 and parameter b3" as the "transmitting panel antenna and parameters" with good reception quality.

[0449] Furthermore, terminal #3 of 902_3 estimates the "frequency (band)," "transmitting panel antenna, and parameters" that provide good reception quality, and at the same time obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." In the case of Figure 26, terminal #3 of 902_3 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 8.

[0450] In this case, terminal #3 of 902_3 uses a random number to obtain one of the following values: "0", "1", "2", "3", "4", "5", "6", or "7". For example, suppose terminal #3 of 902_3 obtains "5" using a random number. In this case, "5" + 1 = 6, so terminal #3 of 902_3 transmits terminal #3 "Sectus Sweep Reference Signal" 2601_3 using the "Terminal "Sectus Sweep Reference Signal" 6th transmission section 1301_6" as shown in Figure 26.

[0451] Furthermore, terminal #3, "reference signal for sectus sweep" 2601_3, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, that is, information on "transmitting panel antenna a3 and parameter b3".

[0452] At this time, as shown in Figure 26, the time intervals of "Terminal #2 'Sectus Sweep Reference Signal' 2401_2 transmitted by Terminal #2 of 902_2" and "Terminal #3 'Sectus Sweep Reference Signal' 2601_3 transmitted by Terminal #3 of 902_3" overlap.

[0453] Therefore, base station #1 of 901_1 may simultaneously receive terminal #2 "Secta Sweep Reference Signal" 2401_2 and terminal #3 "Secta Sweep Reference Signal" 2601_3.

[0454] In this case, the following two scenarios are possible.

[0455] <Case 1> Both "Terminal #2 of 902_2 transmits the terminal #2 'Sectus Sweep Reference Signal' 2401_2" and "Terminal #3 of 902_3 transmits the terminal #3 'Sectus Sweep Reference Signal' 2601_3" have the configurations shown in Figures 15A and 15B.

[0456] At this time, when base station #1 of 901_1 receives the terminal #2 "Sectus Sweep Reference Signal" 2401_2 transmitted by terminal #2 of 902_2, the parameters for the transmitting panel antenna and beamforming of terminal #2 of 902_2 that have good reception quality are different from when base station #1 of 901_1 receives the terminal #3 "Sectus Sweep Reference Signal" 2601_3 transmitted by terminal #3 of 902_3, the parameters for the transmitting panel antenna and beamforming of terminal #3 of 902_3 that have good reception quality. Therefore, base station #1 of 901_1 is assumed to have obtained both the information contained in the terminal #2 "Sectus Sweep Reference Signal" 2401_2 transmitted by terminal #2 of 902_2 and the information contained in the terminal #3 "Sectus Sweep Reference Signal" 2601_3 transmitted by terminal #3 of 902_3.

[0457] In this case, for example, in Figure 16A, the second transmission section 1601_12 of the feedback signal for frequency ♭1 is set as a signal destined for terminal #2 of 902_2, and the third transmission section 1601_13 of the feedback signal for frequency ♭1 is set as a signal destined for terminal #3 of 902_3.

[0458] Furthermore, for example, in Figure 17A, the second transmission section 1701_12 of the modulation signal (slot) for frequency ♭1 is set as a signal destined for terminal #2 of 902_2, and the third transmission section 1701_13 of the modulation signal (slot) for frequency ♭1 is set as a signal destined for terminal #3 of 902_3.

[0459] In this way, base station #1 of 901_1 can communicate with terminal #2 of 902_2 and terminal #3 of 902_3.

[0460] <Case 2> Both "Terminal #2 of 902_2 transmits the terminal #2 'Sectus Sweep Reference Signal' 2401_2" and "Terminal #3 of 902_3 transmits the terminal #3 'Sectus Sweep Reference Signal' 2601_3" have the configurations shown in Figures 15A and 15B.

[0461] At this time, it is assumed that when base station #1 of 901_1 receives the terminal #2 "Sectus 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" that provide good reception quality, and when base station #1 of 901_1 receives the terminal #3 "Sectus 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" that provide good reception quality, interference occurs.

[0462] <Case 2-1> Base station #1 of 901_1 may obtain either the information contained in "Terminal #2 'Secta Sweep Reference Signal' 2401_2 transmitted by Terminal #2 of 902_2" or the information contained in "Terminal #3 'Secta Sweep Reference Signal' 2601_3 transmitted by Terminal #3 of 902_3".

[0463] For example, let's assume that base station #1 of 901_1 has obtained the information contained in "Terminal #2 "Secta Sweep Reference Signal" 2401_2 transmitted by Terminal #2 of 902_2".

[0464] In this case, for example, in Figure 16A, the second transmission section 1601_13 of the feedback signal for frequency ♭1 is set to the signal destined for terminal #2 of 902_2.

[0465] Also, for example, in Figure 17A, the second transmission section 1701_13 of the modulation signal (slot) for frequency ♭1 is set to the signal destined for terminal #2 of 902_2.

[0466] In this way, base station #1 of 901_1 can communicate with terminal #1 of 902_1 and terminal #2 of 902_2.

[0467] This section describes the operation of terminal #3 in 902_3.

[0468] Let's assume that the reference signal 1851_1 for the secta sweep in Figure 18 is in the state shown in Figure 26. Therefore, frames 1803_1, 1803_2, and 1803_3 containing the data symbols in Figure 18 do not contain any frames (slots) destined for terminal #3 of 902_3.

[0469] In this case, terminal #3 of 902_3 in Figure 9 receives the sectus sweep reference signal 1801_2 shown in Figure 19 transmitted by base station #1 of 901_1, and by obtaining a "frequency (band)" with good reception quality, the "ID (identification) (identification number) of the transmitting panel antenna," and the "identification number (ID) of the parameters used in beamforming (directional control)," it is possible to communicate with base station #1 of 901_1.

[0470] Terminal #3 of 902_3 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a3 and parameter b3".

[0471] Furthermore, terminal #3 of 902_3 performs these estimations and simultaneously obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." Terminal #3 of 902_3 obtains the information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 8.

[0472] In this case, terminal #3 of 902_3 uses a random number to obtain one of the following values: "0", "1", "2", "3", "4", "5", "6", or "7". For example, suppose terminal #3 of 902_3 generates a random number using a different sequence than the previous one and obtains "3". In this case, "3" + 1 = 4, so terminal #3 of 902_3 transmits terminal #3 "Sectus Sweep Reference Signal" 2401_3 using the "Terminal "Sectus Sweep Reference Signal" 4th transmission section 1301_4" as shown in Figure 24.

[0473] Furthermore, terminal #3, "Reference signal for Sectus Sweep" 2401_3, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, that is, information on "transmitting panel antenna a3 and parameter b3".

[0474] At this time, as shown in Figure 24, base station #1 of 901_1 will receive the "Secta Sweep Reference Signal 2401_3" transmitted by terminal #3 of 902_3, and thereafter, base station #1 of 901_1 and terminal #3 of 902_3 will communicate after performing the predetermined procedure described above.

[0475] <Case 2-2> There are cases where base station #1 of 901_1 cannot obtain both the information contained in "Terminal #2 'Sectus Sweep Reference Signal' 2401_2 transmitted by Terminal #2 of 902_2" and the information contained in "Terminal #3 'Sectus Sweep Reference Signal' 2601_3 transmitted by Terminal #3 of 902_3".

[0476] In the case of the sectus sweep reference signal 1851_1 in Figure 18, assuming the situation is as shown in Figure 26, base station #1 of 901_1 cannot obtain either the information contained in "Terminal #2 "Sectus Sweep Reference Signal" 2401_2 transmitted by Terminal #2 of 902_2" or the information contained in "Terminal #3 "Sectus Sweep Reference Signal" 2601_3 transmitted by Terminal #3 of 902_3". In this case, frames 1803_1, 1803_2, and 1803_3 containing the data symbols in Figure 18 will not contain frames (slots) addressed to Terminal #2 of 902_2 or frames (slots) addressed to Terminal #3 of 902_3.

[0477] In this case, terminal #2 of 902_2 in Figure 9 receives the secta sweep reference signal 1801_2 shown in Figure 19 transmitted by base station #1 of 901_1, and by obtaining the "frequency (band)", "ID (identification) (identification number) of the transmitting panel antenna" and the "identification number (ID) of the parameters used in beamforming (directional control)" with good reception quality, it is possible to communicate with base station #1 of 901_1.

[0478] Terminal #2 of 902_2 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a2 and parameter b2".

[0479] Furthermore, terminal #2 of 902_2 performs these estimations and simultaneously obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." Terminal #2 of 902_2 obtains information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 8.

[0480] In this case, terminal #2 of 902_2 uses a random number to obtain one of the following values, for example, "0", "1", "2", "3", "4", "5", "6", or "7". For example, suppose terminal #2 of 902_2 generates a random number using a different sequence than the previous time and obtains "5". In this case, since "5" + 1 = 6, terminal #2 of 902_2 transmits terminal #2 "Sectus Sweep Reference Signal" 2401_2 using the "Terminal "Sectus Sweep Reference Signal" 6th transmission section 1301_6" as shown in Figure 24.

[0481] Furthermore, terminal #2, "Reference signal for Sectus Sweep" 2401_2, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #2 of 902_2, that is, information on "transmitting panel antenna a2 and parameter b3".

[0482] At this time, as shown in Figure 24, base station #1 of 901_1 will receive the "Secta Sweep Reference Signal 2401_2" transmitted by terminal #2 of 902_2, and thereafter, base station #1 of 901_1 and terminal #2 of 902_2 will communicate after performing the predetermined procedure described above.

[0483] Similarly, terminal #3 of 902_3 in Figure 9 receives the sectus sweep reference signal 1801_2 shown in Figure 19 transmitted by base station #1 of 901_1, and by obtaining the "frequency (band)," "ID (identification) of the transmitting panel antenna," and "ID of the parameters used in beamforming (directional control)" with good reception quality, it is possible to communicate with base station #1 of 901_1.

[0484] Terminal #3 of 902_3 is estimated to have frequency band ♭1 as the "frequency (band)" with good reception quality, and the "transmitting panel antenna and parameters" are estimated to be, for example, "transmitting panel antenna a3 and parameter b3".

[0485] Furthermore, terminal #3 of 902_3 performs these estimations and simultaneously obtains information on "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep." Terminal #3 of 902_3 obtains the information that "the number of time divisions to which the reference signal for secta sweep can be transmitted when the terminal transmits the reference signal for secta sweep" is 8.

[0486] In this case, terminal #3 of 902_3 uses a random number to obtain one of the following values, for example, "0", "1", "2", "3", "4", "5", "6", or "7". For example, suppose terminal #3 of 902_3 generates a random number using a different sequence than the previous time and obtains "3". In this case, "3" + 1 = 4, so terminal #3 of 902_3 transmits terminal #3 "Sectus Sweep Reference Signal" 2401_3 using the "Terminal "Sectus Sweep Reference Signal" 4th transmission section 1301_4" as shown in Figure 24.

[0487] Furthermore, terminal #3, "Reference signal for Sectus Sweep" 2401_3, is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #3 of 902_3, that is, information on "transmitting panel antenna a3 and parameter b3".

[0488] At this time, as shown in Figure 24, base station #1 of 901_1 will receive the "Secta Sweep Reference Signal 2401_3" transmitted by terminal #3 of 902_3, and thereafter, base station #1 of 901_1 and terminal #3 of 902_3 will communicate after performing the predetermined procedure described above.

[0489] By doing so, collisions of sectus sweep reference signals transmitted by each terminal can be further reduced, which increases the number of sectus sweep reference signals that the base station can receive, and thus increases the number of terminals that the base station can communicate with.

[0490] As described in Embodiment 2, the terminal can improve the communication capacity of the system consisting of the base station and the terminal by transmitting a reference signal for sectus sweeping in order to reduce the number of collisions. Note that the configuration of the terminal and base station is not limited to the configurations in Figures 1A, 1B, and 1C. Also, the configuration of the transmitting panel antenna and receiving panel antenna is not limited to the configurations in Figures 3 and 4; for example, any antenna configuration that can generate one or more transmitting and receiving directivity is acceptable. Furthermore, although signals, frames, etc. exist in Figures 10, 11, 12, 23, 24, 15A, 15B, 16A, 16B, 17A, 17B, 18, 19, 24, 25, and 26, the names are not limited to these, and the function of the transmitted signal itself is important.

[0491] (Embodiment 3) This third embodiment describes an example of the first embodiment in which a base station transmits multiple modulated signals (multiple streams) to a terminal. (That is, it describes an example in which MIMO (Multiple-Input Multiple-Output) is implemented.) In the following description of the third embodiment, the figures shown in the first and second embodiments may be referenced.

[0492] Figure 9 shows an example of the communication state in this embodiment. Further details have already been explained, so they will be omitted here.

[0493] Figure 27 shows an example of the modulated signal 2700 transmitted by base station #1 of 901_1 in Figure 9. Components that operate similarly to those in Figure 10 are given the same number and their explanations are omitted.

[0494] A reference signal 1001 for secta sweep is present in the time interval from time t0 to t1.

[0495] The time interval from time t1 to t2 is the response interval for the terminal.

[0496] A group of feedback signals 2702 exists in the time interval from time t2 to t3. The feedback signal group 2702 will be explained later.

[0497] The time interval from time t4 to t5 contains a group of frames 2703 that include data symbols. This group of frames 2703 will be explained later.

[0498] The configuration of base station #1 of 901_1 in Figure 9 is assumed to be the configuration shown in Figures 1A, 1B, and 1C, as described in other embodiments. Furthermore, base station #1 of 901_1 having the configurations shown in Figures 1A, 1B, and 1C is assumed to have the configuration shown in Figure 3 as the transmitting panel antenna xi of 106_xi. However, base station #1 of 901_1 is not limited to the configurations shown in Figures 1A, 1B, and 1C, and the configuration of the transmitting panel antenna xi of 106_xi of base station #1 of 901_1 having the configurations shown in Figures 1A, 1B, and 1C is not limited to Figure 3.

[0499] Figure 11 shows an example of the reference signal 1001 for the secta sweep shown in Figure 23, transmitted by base station #1 in Figure 9. Note that the operation of Figure 11 has already been explained, so the explanation will be omitted here.

[0500] Figure 12 shows an example configuration of the "reference signal 1101_i for secta sweep in the transmitting panel antenna i" in Figure 11. Note that the operation of Figure 12 has already been explained, so the explanation will be omitted here.

[0501] Figure 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 shown in Figure 13 has already been explained, so the explanation will be omitted here.

[0502] Figure 14 shows an example of terminal occupation for the first transmission section 1301_1, the second transmission section 1301_2, the third transmission section 1301_3, and the fourth transmission section 1301_4 of the terminal "Sectus Sweep Reference Signal" shown in Figure 13. Since the operation of Figure 14 has already been explained, only the differences in operation in this embodiment will be explained.

[0503] In Figure 9, terminal #1 of 902_1 may want to receive multiple modulated signals from base station #1 of 901_1. Here, terminal #1 of 902_1 in Figure 9 may want to receive two modulated signals from base station #1 of 901_1. In this case, terminal #1 of 902_1 in Figure 9 will receive the secta sweep reference signal 1001 transmitted by base station #1 of 901_1 and estimate the two "transmitting panel antennas and parameter numbers" with good reception quality from among the transmitting panel antennas of base station #1 of 901_1.

[0504] At this time, the two "transmitting panel antennas and parameter numbers" with good reception quality are named the first "transmitting panel antenna and parameter number" and the second "transmitting panel antenna and parameter number". Furthermore, the "transmitting panel antenna of the first "transmitting panel antenna and parameter number"" and the "transmitting panel antenna of the second "transmitting panel antenna and parameter number"" are considered to be different.

[0505] At this time, terminal #1 of 902_1 in Figure 9 will select the first frequency (band) in conjunction with the first "transmitting panel antenna and parameter number". Similarly, terminal #1 of 902_1 in Figure 9 will select the second frequency (band) in conjunction with the second "transmitting panel antenna and parameter number". The first frequency (band) and the second frequency (band) may be the same, different, or may share some common frequencies.

[0506] This estimation can be performed by obtaining the secta sweep reference signal 1001 and the "ID (identification number) of the transmitting panel antenna" and the "identification number (ID) of the parameters used in beamforming (directional control)" contained therein. Specifically, this is done when base station #1 of 901_1 transmits the secta sweep reference signal shown in Figure 11, and terminal #1 of 902_1 receives the secta sweep reference signal shown in Figure 11.

[0507] Terminal #1 of 902_1 is assumed to have two "transmitting panel antennas and parameters" with good reception quality, for example, "transmitting panel antenna a1_1 and parameter b1_1" and "transmitting panel antenna a1_2 and parameter b1_2". (Note that in the following explanations using Figures 28A, 28B, 29A, and 29B, "transmitting panel antenna a1_1" will be referred to as transmitting panel antenna 1 of 106_1 (of base station #1 of 901_1) in Figures 1A, 1B, and 1C, and "transmitting panel antenna a1_2" will be referred to as transmitting panel antenna 2 of 106_2 (of base station #1 of 901_1) in Figures 1A, 1B, and 1C.) (Furthermore, the frequency (band) will be estimated in conjunction with "transmitting panel antenna a1_1 and parameter b1_1". Similarly, the frequency (band) will be estimated in conjunction with "transmitting panel antenna a1_2 and parameter b1_2".)

[0508] 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 on which a reference signal for secta sweep can be transmitted (the number of terminals on which a reference signal for secta sweep can be transmitted)" when the terminal transmits a reference signal for secta sweep. In the case of Figure 14, terminal #1 of 902_1 obtains information that "the number of time divisions on which a reference signal for secta sweep can be transmitted when the terminal transmits a reference signal for secta sweep" is 4.

[0509] In this case, terminal #1 of 902_1 uses a random number to obtain one of the following values: for example, "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 "Sectus Sweep Reference Signal" 1401_1 using the "Terminal "Sectus Sweep Reference Signal" 1 (= "0" + 1) transmission section 1301_1" in Figure 14. (See Figure 14) (It is assumed that terminal #1 "Sectus Sweep Reference Signal" 1401_1 exists in the frequency band ♭K.)

[0510] Furthermore, the "Secta Sweep Reference Signal" 1401_1 of terminal #1 is assumed to contain information on the "transmitting panel antenna and parameters" with good reception quality obtained by terminal #1 of 902_1, namely, information on "transmitting panel antenna a1_1 and parameter b1_1" and information on "transmitting panel antenna a1_2 and parameter b1_2". In addition, the Secta Sweep Reference Signal 1401_1 may also contain request information from terminal #1 of 902_1 regarding the "number of modulated signals (streams) that it wants base station #1 of 901_1 to transmit" (here, "2"). Moreover, the "Secta Sweep Reference Signal" 1401_1 of terminal #1 contains frequency (band) information corresponding to the information on "transmitting panel antenna a1_1 and parameter b1_1" (here, frequency band ♭K) and frequency (band) information corresponding to the information on "transmitting panel antenna a1_2 and parameter b1_2" (here, frequency band ♭K).

[0511] The information and transmission status included in the secta sweep reference signal transmitted by other terminals are explained in other embodiments using Figure 14, so the explanation is omitted here. Note that the secta sweep reference signal transmitted by other terminals may include request information for the "number of modulated signals (streams) to be transmitted to base station #1 of 901_1". For example, if the "number of modulated signals (streams) to be transmitted to base station #1 of 901_1" is "1", this information will be included. (The "number of modulated signals (streams) to be transmitted to base station #1 of 901_1" will be set to a number of "1" or greater.)

[0512] By doing so, collisions of sect sweep reference signals transmitted by each terminal can be reduced, thereby increasing the number of sect sweep reference signals that the base station can receive, and thus increasing the number of terminals that the base station can communicate with. Furthermore, by doing so, the base station can transmit one or more modulated signals (streams) to each terminal.

[0513] The configuration of terminal #i "Sectus Sweep Reference Signal" 1401_i transmitted by terminal #i of 902_i, as explained using Figure 14, will now be described. For the sake of simplicity, terminal #i of 902_i will be assumed to have the configurations shown in Figures 1A, 1B, and 1C. Furthermore, terminal #i of 902_i having the configurations shown in Figures 1A, 1B, and 1C will be assumed to have the configuration shown in Figure 3 as the transmitting panel antenna xi of 106_xi. However, the configuration of terminal #i of 902_i is not limited to the configurations shown in Figures 1A, 1B, and 1C, and the configuration of the transmitting panel antenna xi of terminal #i of 902_i having the configurations shown in Figures 1A, 1B, and 1C is not limited to Figure 3.

[0514] For example, terminal #i of 902_i having the configurations shown in Figures 1A, 1B, and 1C transmits terminal #i "Sectus Sweep Reference Signal" 1401_i, as shown in Figure 14. The configuration and information contained in terminal #i "Sectus Sweep Reference Signal" 1401_i are explained in other embodiments using Figures 15A and 15B, so the explanation is omitted here.

[0515] The following sections will explain several cases.

[0516] <Case 1> Figures 28A and 28B show an example of the configuration of the feedback signal group 2702 transmitted by base station #1 of 901_1 in the time interval from t2 to t3 in Figure 27. In Figures 28A and 28B, the horizontal axis represents time and the vertical axis represents frequency. For the sake of simplicity, base station #1 of 901_1 is assumed to be equipped with four transmitting panel antennas: transmitting panel antenna 1 of 106_1, transmitting panel antenna 2 of 106_2, transmitting panel antenna 3 of 106_3, and transmitting panel antenna 4 of 106_4. In Figures 28A and 28B, as in Figure 16A, the feedback signal group 2702 is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0517] Note that Figures 28A and 28B only deal with feedback signals destined for terminal #1 of 902_1. However, although not shown in Figures 28A and 28B, feedback signals destined for terminals other than terminal #1 of 902_1 may also exist.

[0518] In this example, since the "number of time divisions to which a reference signal for sectus sweep can be transmitted when a terminal transmits a reference signal for sectus sweep" is 4, the feedback signal group 2702 contains, as shown in Figure 28A, a feedback signal (1) addressed to terminal #1 of 2811_11 in the frequency band ♭K of the first transmission section, and as shown in Figure 28B, a feedback signal (2) addressed to terminal #1 of 2811_12 in the frequency band ♭K of the first transmission section.

[0519] The reason we refer to this as a feedback signal group is that it allows for the presence of feedback signals transmitted from the transmitting panel antenna 1 (106_1), the transmitting panel antenna 2 (106_2), the transmitting panel antenna 3 (106_3), and the transmitting panel antenna 4 (106_4) within the same frequency band and transmission section.

[0520] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits a secta sweep reference signal 1401_1, base station #1 of 901_1 transmits the "feedback signal (1) for terminal #1 of 2811_11" located in the frequency band ♭K of the first transmission section, as shown in Figure 28A, and the "feedback signal (2) for terminal #1 of 2811_12" located in the frequency band ♭K of the first transmission section, as shown in Figure 28B. At this time, the "feedback signal (1) for terminal #1 of 2811_11" is transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1, and the "feedback signal (2) for terminal #1 of 2811_12" is transmitted from the 106_2 transmitting panel antenna 2 of base station #1 of 901_1.

[0521] Thus, the existence of "feedback signal (1) for terminal #1 of 2811_11" and "feedback signal (2) for terminal #1 of 2811_12" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1".

[0522] At this time, the "feedback signal (1) to terminal #1 of 2811_11" is assumed to contain information such as that terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 1 of 106_1.

[0523] In addition, the "feedback signal (2) to terminal #1 of 2811_12" is assumed to include information such as that terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 2 of 106_2.

[0524] Based on the information transmitted by terminal #1 of 902_1 regarding the transmission panel antennas and parameters of base station #1 of 901_1, and the frequency (band) information, base station #1 of 901_1 selects the transmission panel antenna and sets the beamforming parameters. As shown in Figure 28A, base station #1 of 901_1 transmits a feedback signal (1) addressed to terminal #1 of 2811_11, located in the frequency band ♭K of the first transmission section, and as shown in Figure 28B, a feedback signal (2) addressed to terminal #1 of 2811_12, also located in the frequency band ♭K of the first transmission section, to terminal #1 of 902_1.

[0525] Furthermore, in Figures 28A and 28B, there may be feedback signals destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 16B)

[0526] Furthermore, in the above example, as shown in Figures 28A and 28B, base station #1 of 901_1 sends "feedback signal (1) addressed to terminal #1 of 2811_11" and "feedback signal (2) addressed to terminal #1 of 2811_12" to terminal #1 of 902_1. However, base station #1 of 901_1 may send three or more feedback signals to terminal #1 of 902_1.

[0527] Figures 29A and 29B show an example of the configuration of frame group 2703 containing data symbols transmitted by base station #1 of 901_1, in the time interval from t4 to t5 in Figure 27. In Figures 29A and 29B, the horizontal axis represents time and the vertical axis represents frequency. In Figures 29A and 29B, as in Figure 17A, the frame group 2703 containing data symbols has a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0528] Note that Figures 29A and 29B deal with modulated signals (slots) destined for terminal #1 of 902_1. However, although not shown in Figures 29A and 29B, modulated signals (slots) destined for terminals other than terminal #1 of 902_1 may also exist.

[0529] In this example, since the "number of time divisions to which a reference signal for a secta sweep can be transmitted when a terminal transmits a reference signal for a secta sweep" is 4, the frame group 2703 containing data symbols has a modulated signal (slot) (1) addressed to terminal #1 of 2911_11 in the frequency band ♭K of the first transmission section, as shown in Figure 29A, and a modulated signal (slot) (2) addressed to terminal #1 of 2911_12 in the frequency band ♭K of the first transmission section, as shown in Figure 29B.

[0530] The reason why this is referred to as a group of frames containing data symbols is that it allows for the existence of "frames containing data symbols" transmitted from the transmitting panel antenna 1 of 106_1, as well as from the transmitting panel antenna 2 of 106_2, as well as from the transmitting panel antenna 3 of 106_3, and as well as from the transmitting panel antenna 4 of 106_4, all within the same frequency band and transmission section.

[0531] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits a reference signal 1401_1 for sect sweeping, base station #1 of 901_1 transmits the "modulated signal (slot) (1) for terminal #1 of 2911_11" which is located in the frequency band ♭K of the first transmission section, as shown in Figure 29A, and the "modulated signal (slot) (2) for terminal #1 of 2911_12" which is located in the frequency band ♭K of the first transmission section, as shown in Figure 29B. At this time, the "modulated signal (slot) (1) for terminal #1 of 2911_11" is transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1, and the "modulated signal (slot) (2) for terminal #1 of 2911_12" is transmitted from the 106_2 transmitting panel antenna 2 of base station #1 of 901_1.

[0532] Thus, the existence of "modulated signal (slot) (1) for terminal #1 of 2911_11" and "modulated signal (slot) (2) for terminal #1 of 2911_12" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1".

[0533] In this case, the "modulated signal (slot) (1) of 2911_11 destined for terminal #1" is assumed to include, for example, a data symbol (data, information) destined for terminal #1 of 902_1.

[0534] In addition, the "modulated signal (slot) (2) for terminal #1 of 2911_12" also includes, for example, a data symbol (data, information) for terminal #1 of 902_1.

[0535] Based on the information transmitted by terminal #1 of 902_1 regarding the two best receiving quality transmission panel antennas and parameters of base station #1 of 901_1, and frequency (band) information, base station #1 of 901_1 selects a transmission panel antenna, sets the beamforming parameters, and transmits to terminal #1 of 902_1 the modulation signal (slot) (1) addressed to terminal #1 of 2911_11, which is located in the frequency band ♭K of the first transmission section, as shown in Figure 29A, and the modulation signal (slot) (2) addressed to terminal #1 of 2911_12, which is located in the frequency band ♭K of the first transmission section, as shown in Figure 29B.

[0536] Furthermore, in Figures 29A and 29B, there may be modulated signals (slots) destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 17B)

[0537] Furthermore, in the above example, as shown in Figures 29A and 29B, base station #1 of 901_1 transmits "modulated signal (slot) (1) addressed to terminal #1 of 2911_11" and "modulated signal (slot) (2) addressed to terminal #1 of 2911_12" to terminal #1 of 902_1. However, 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.

[0538] Furthermore, in "2911_11 modulated signal (slot) (1)" and "2911_12 modulated signal (slot) (2)," in addition to data symbols, other symbols may be included, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information. Symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and MCS information.

[0539] <Case 2> Figures 30A and 30B show an example of the configuration of the feedback signal group 2702 transmitted by base station #1 of 901_1 in the time interval from t2 to t3 in Figure 27. In Figures 30A and 30B, the horizontal axis represents time and the vertical axis represents frequency. For the sake of simplicity, base station #1 of 901_1 is assumed to be equipped with four transmitting panel antennas: transmitting panel antenna 1 of 106_1, transmitting panel antenna 2 of 106_2, transmitting panel antenna 3 of 106_3, and transmitting panel antenna 4 of 106_4. In Figures 30A and 30B, as in Figure 16A, the feedback signal group 2702 is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0540] Note that Figures 30A and 30B only deal with feedback signals destined for terminal #1 of 902_1. However, although not shown in Figures 30A and 30B, feedback signals destined for terminals other than terminal #1 of 902_1 may also exist.

[0541] In this example, since the "number of time divisions to which a reference signal for sectus sweep can be transmitted when a terminal transmits a reference signal for sectus sweep" is 4, the feedback signal group 2702 contains, as shown in Figure 30A, a feedback signal (1) addressed to terminal #1 of 3011_11 in the frequency band ♭K of the first transmission section, and as shown in Figure 30B, a feedback signal (2) addressed to terminal #1 of 3011_12 in the frequency band ♭2 of the first transmission section.

[0542] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits a reference signal 1401_1 for secta sweep, base station #1 of 901_1 transmits the "feedback signal (1) for terminal #1 of 3011_11" located in the frequency band ♭K of the first transmission section, as shown in Figure 30A, and the "feedback signal (2) for terminal #1 of 3011_12" located in the frequency band ♭2 of the first transmission section, as shown in Figure 30B. At this time, the "feedback signal (1) for terminal #1 of 3011_11" is transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1, and the "feedback signal (2) for terminal #1 of 3011_12" is transmitted from the 106_2 transmitting panel antenna 2 of base station #1 of 901_1.

[0543] Thus, the existence of "feedback signal (1) for terminal #1 of 3011_11" and "feedback signal (2) for terminal #1 of 3011_12" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1".

[0544] At this time, the "feedback signal (1) to terminal #1 of 3011_11" is assumed to contain information such as that terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 1 of 106_1.

[0545] In addition, the "feedback signal (2) to terminal #1 of 3011_12" is assumed to include information such as that terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 2 of 106_2.

[0546] Based on the information transmitted by terminal #1 of 902_1 regarding the transmission panel antennas and parameters of base station #1 of 901_1, and the frequency (band) information, base station #1 of 901_1 selects the transmission panel antenna and sets the beamforming parameters. As shown in Figure 30A, base station #1 of 901_1 transmits a feedback signal (1) addressed to terminal #1 of 3011_11, located in the frequency band ♭K of the first transmission section, and as shown in Figure 30B, a feedback signal (2) addressed to terminal #1 of 3011_12, located in the frequency band ♭2 of the first transmission section, to terminal #1 of 902_1.

[0547] Furthermore, in Figures 30A and 30B, there may be feedback signals destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 16B)

[0548] Furthermore, in the above example, as shown in Figures 30A and 30B, base station #1 of 901_1 sends "feedback signal (1) addressed to terminal #1 of 3011_11" and "feedback signal (2) addressed to terminal #1 of 3011_12" to terminal #1 of 902_1. However, base station #1 of 901_1 may send three or more feedback signals to terminal #1 of 902_1.

[0549] Figures 31A and 31B show an example of the configuration of frame group 2703 containing data symbols transmitted by base station #1 of 901_1, in the time interval from t4 to t5 in Figure 27. In Figures 31A and 31B, the horizontal axis represents time and the vertical axis represents frequency. In Figures 31A and 31B, as in Figure 17A, the frame group 2703 containing data symbols has a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0550] Note that Figures 31A and 31B deal with modulated signals (slots) destined for terminal #1 of 902_1. However, although not shown in Figures 31A and 31B, modulated signals (slots) destined for terminals other than terminal #1 of 902_1 may also exist.

[0551] In this example, since the "number of time divisions to which a reference signal for a sectus sweep can be transmitted when a terminal transmits a reference signal for a sectus sweep" is 4, the frame group 2703 containing data symbols has a modulated signal (slot) (1) addressed to terminal #1 of 3111_11 in the frequency band ♭K of the first transmission section, as shown in Figure 31A, and a modulated signal (slot) (2) addressed to terminal #1 of 3111_12 in the frequency band ♭2 of the first transmission section, as shown in Figure 31B.

[0552] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits a reference signal 1401_1 for sect sweeping, base station #1 of 901_1 transmits the "modulated signal (slot) (1) for terminal #1 of 3111_11" located in the frequency band ♭K of the first transmission section, as shown in Figure 31A, and the "modulated signal (slot) (2) for terminal #1 of 3111_12" located in the frequency band ♭2 of the first transmission section, as shown in Figure 31B. At this time, the "modulated signal (slot) (1) for terminal #1 of 3111_11" is transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1, and the "modulated signal (slot) (2) for terminal #1 of 3111_12" is transmitted from the 106_2 transmitting panel antenna 2 of base station #1 of 901_1.

[0553] Thus, the existence of "modulated signal (slot) (1) for terminal #1 of 3111_11" and "modulated signal (slot) (2) for terminal #1 of 3111_12" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1".

[0554] In this case, the "modulated signal (slot) (1) of 3111_11 addressed to terminal #1" is assumed to contain, for example, a data symbol (data, information) addressed to terminal #1 of 902_1.

[0555] In addition, the "modulated signal (slot) (2) for terminal #1 of 3111_12" also includes, for example, a data symbol (data, information) for terminal #1 of 902_1.

[0556] Based on the information transmitted by terminal #1 of 902_1 regarding the two best receiving quality transmission panel antennas and parameters of base station #1 of 901_1, and frequency (band) information, base station #1 of 901_1 selects a transmission panel antenna, sets the beamforming parameters, and transmits to terminal #1 of 902_1 the modulation signal (slot) (1) addressed to terminal #1 of 3111_11 located in the frequency band ♭K of the first transmission section, as shown in Figure 31A, and the modulation signal (slot) (2) addressed to terminal #1 of 3111_12 located in the frequency band ♭2 of the first transmission section, as shown in Figure 31B.

[0557] Furthermore, in Figures 31A and 31B, there may be modulated signals (slots) destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 17B)

[0558] Furthermore, in the above example, as shown in Figures 31A and 31B, base station #1 of 901_1 transmits "modulated signal (slot) (1) addressed to terminal #1 of 3111_11" and "modulated signal (slot) (2) addressed to terminal #1 of 3111_12" to terminal #1 of 902_1. However, 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.

[0559] Furthermore, in "3111_11 modulated signal (slot) (1)" and "3111_12 modulated signal (slot) (2)," in addition to data symbols, other symbols may be included, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information. Symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and MCS information.

[0560] <Case 3> Figures 32A and 32B show an example of the configuration of the feedback signal group 2702 transmitted by base station #1 of 901_1 in the time interval from t2 to t3 in Figure 27. In Figures 32A and 32B, the horizontal axis represents time and the vertical axis represents frequency. For the sake of simplicity, base station #1 of 901_1 is assumed to be equipped with four transmitting panel antennas: transmitting panel antenna 1 of 106_1, transmitting panel antenna 2 of 106_2, transmitting panel antenna 3 of 106_3, and transmitting panel antenna 4 of 106_4. In Figures 32A and 32B, as in Figure 16A, the feedback signal group 2702 is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0561] Note that Figures 32A and 32B only deal with feedback signals destined for terminal #1 of 902_1. However, although not shown in Figures 32A and 32B, feedback signals destined for terminals other than terminal #1 of 902_1 may also exist.

[0562] In this example, since the "number of time divisions to which a reference signal for sectus sweep can be transmitted when a terminal transmits a reference signal for sectus sweep" is 4, the feedback signal group 2702 contains, as shown in Figure 32A, a feedback signal (1) addressed to terminal #1 of 3211_11 in the frequency band ♭K of the first transmission section, and as shown in Figure 32B, a feedback signal (2) addressed to terminal #1 of 3211_12 in the frequency band ♭K of the third transmission section.

[0563] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits a reference signal 1401_1 for sect sweeping, base station #1 of 901_1 transmits the "feedback signal (1) for terminal #1 of 3211_11" located in the frequency band ♭K of the first transmission section, as shown in Figure 32A, and the "feedback signal (2) for terminal #1 of 3211_12" located in the frequency band ♭K of the third transmission section, as shown in Figure 32B. At this time, the "feedback signal (1) for terminal #1 of 3211_11" is transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1, and the "feedback signal (2) for terminal #1 of 3211_12" is transmitted from the 106_2 transmitting panel antenna 2 of base station #1 of 901_1.

[0564] Thus, the existence of "feedback signal (1) for terminal #1 of 3211_11" and "feedback signal (2) for terminal #1 of 3211_12" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1".

[0565] At this time, the "feedback signal (1) to terminal #1 of 3211_11" is assumed to contain information such as that terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 1 of 106_1.

[0566] In addition, the "feedback signal (2) to terminal #1 of 3211_12" is assumed to include information such as that terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 2 of 106_2.

[0567] Based on the information transmitted by terminal #1 of 902_1 regarding the transmission panel antennas and parameters of base station #1 of 901_1, as well as frequency (band) information, base station #1 of 901_1 selects the transmission panel antenna and sets the beamforming parameters. As shown in Figure 32A, base station #1 of 901_1 transmits a feedback signal (1) addressed to terminal #1 of 3211_11, located in the frequency band ♭K of the first transmission section, and as shown in Figure 32B, a feedback signal (2) addressed to terminal #1 of 3211_12, located in the frequency band ♭K of the third transmission section, to terminal #1 of 902_1.

[0568] Furthermore, in Figures 32A and 32B, there may be feedback signals destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 16B)

[0569] Furthermore, in the above example, as shown in Figures 32A and 32B, base station #1 of 901_1 sends "feedback signal (1) addressed to terminal #1 of 3211_11" and "feedback signal (2) addressed to terminal #1 of 3211_12" to terminal #1 of 902_1. However, base station #1 of 901_1 may send three or more feedback signals to terminal #1 of 902_1.

[0570] Figures 33A and 33B show an example of the configuration of frame group 2703 containing data symbols transmitted by base station #1 of 901_1, in the time interval from t4 to t5 in Figure 27. In Figures 33A and 33B, the horizontal axis represents time and the vertical axis represents frequency. In Figures 33A and 33B, as in Figure 17A, the frame group 2703 containing data symbols has a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0571] Note that Figures 33A and 33B deal with modulated signals (slots) destined for terminal #1 of 902_1. However, although not shown in Figures 33A and 33B, modulated signals (slots) destined for terminals other than terminal #1 of 902_1 may also exist.

[0572] In this example, since the "number of time divisions to which a reference signal for a sectus sweep can be transmitted when a terminal transmits a reference signal for a sectus sweep" is 4, the frame group 2703 containing data symbols has a modulated signal (slot) (1) addressed to terminal #1 of 3311_11 in the frequency band ♭K of the first transmission section, as shown in Figure 33A, and a modulated signal (slot) (2) addressed to terminal #1 of 3311_12 in the frequency band ♭K of the third transmission section, as shown in Figure 33B.

[0573] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits a reference signal 1401_1 for sect sweeping, base station #1 of 901_1 transmits the "modulated signal (slot) (1) for terminal #1 of 3311_11" located in the frequency band ♭K of the first transmission section, as shown in Figure 33A, and the "modulated signal (slot) (2) for terminal #1 of 3311_12" located in the frequency band ♭K of the third transmission section, as shown in Figure 33B. At this time, the "modulated signal (slot) (1) for terminal #1 of 3311_11" is transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1, and the "modulated signal (slot) (2) for terminal #1 of 3311_12" is transmitted from the 106_2 transmitting panel antenna 2 of base station #1 of 901_1.

[0574] Thus, the existence of "modulated signal (slot) (1) for terminal #1 of 3311_11" and "modulated signal (slot) (2) for terminal #1 of 3311_12" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1".

[0575] In this case, the "modulated signal (slot) (1) of 3311_11 addressed to terminal #1" is assumed to include, for example, a data symbol (data, information) addressed to terminal #1 of 902_1.

[0576] In addition, the "modulated signal (slot) (2) for terminal #1 of 3311_12" also includes, for example, a data symbol (data, information) for terminal #1 of 902_1.

[0577] Based on the information transmitted by terminal #1 of 902_1 regarding the two best receiving quality transmission panel antennas and parameters of base station #1 of 901_1, and frequency (band) information, base station #1 of 901_1 selects a transmission panel antenna, sets the beamforming parameters, and transmits to terminal #1 of 902_1 the modulation signal (slot) (1) addressed to terminal #1 of 3311_11 located in the frequency band ♭K of the first transmission section, as shown in Figure 33A, and the modulation signal (slot) (2) addressed to terminal #1 of 3311_12 located in the frequency band ♭K of the third transmission section, as shown in Figure 33B.

[0578] Furthermore, in Figures 33A and 33B, there may be modulated signals (slots) destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 17B)

[0579] Furthermore, in the above example, as shown in Figures 33A and 33B, base station #1 of 901_1 transmits "modulated signal (slot) (1) addressed to terminal #1 of 3311_11" and "modulated signal (slot) (2) addressed to terminal #1 of 3311_12" to terminal #1 of 902_1. However, 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.

[0580] Furthermore, in "3311_11 modulated signal (slot) (1)" and "3311_12 modulated signal (slot) (2)," in addition to data symbols, other symbols may be included, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information. Symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and MCS information.

[0581] <Case 4> Figures 34A and 34B show an example of the configuration of the feedback signal group 2702 transmitted by base station #1 of 901_1 in the time interval from t2 to t3 in Figure 27. In Figures 34A and 34B, the horizontal axis represents time and the vertical axis represents frequency. For the sake of simplicity, base station #1 of 901_1 is assumed to be equipped with four transmitting panel antennas: transmitting panel antenna 1 of 106_1, transmitting panel antenna 2 of 106_2, transmitting panel antenna 3 of 106_3, and transmitting panel antenna 4 of 106_4. In Figures 34A and 34B, as in Figure 16A, the feedback signal group 2702 is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0582] Note that Figures 34A and 34B only deal with feedback signals destined for terminal #1 of 902_1. However, although not shown in Figures 34A and 34B, feedback signals destined for terminals other than terminal #1 of 902_1 may also exist.

[0583] In this example, since the "number of time divisions to which a reference signal for sectus sweep can be transmitted when a terminal transmits a reference signal for sectus sweep" is 4, the feedback signal group 2702 contains, as shown in Figure 34A, a feedback signal (1) addressed to terminal #1 of 3411_11 in the frequency band ♭K of the first transmission section, and as shown in Figure 34B, a feedback signal (2) addressed to terminal #1 of 3411_12 in the frequency band ♭2 of the third transmission section.

[0584] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits a reference signal 1401_1 for secta sweep, base station #1 of 901_1 transmits the "feedback signal (1) for terminal #1 of 3411_11" located in the frequency band ♭K of the first transmission section, as shown in Figure 34A, and the "feedback signal (2) for terminal #1 of 3411_12" located in the frequency band ♭2 of the third transmission section, as shown in Figure 34B. At this time, the "feedback signal (1) for terminal #1 of 3411_11" is transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1, and the "feedback signal (2) for terminal #1 of 3411_12" is transmitted from the 106_2 transmitting panel antenna 2 of base station #1 of 901_1.

[0585] Thus, the existence of "feedback signal (1) for terminal #1 of 3411_11" and "feedback signal (2) for terminal #1 of 3411_12" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1".

[0586] In this case, the "feedback signal (1) to terminal #1 of 3411_11" is assumed to contain information that, for example, terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 1 of 106_1.

[0587] In addition, the "feedback signal (2) to terminal #1 of 3411_12" is assumed to include information such as that terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 2 of 106_2.

[0588] Based on the information transmitted by terminal #1 of 902_1 regarding the transmission panel antennas and parameters of base station #1 of 901_1, as well as frequency (band) information, base station #1 of 901_1 selects the transmission panel antenna and sets the beamforming parameters. As shown in Figure 34A, base station #1 of 901_1 transmits a feedback signal (1) addressed to terminal #1 of 3411_11, located in the frequency band ♭K of the first transmission section, and as shown in Figure 34B, a feedback signal (2) addressed to terminal #1 of 3411_12, located in the frequency band ♭2 of the third transmission section, to terminal #1 of 902_1.

[0589] Furthermore, in Figures 34A and 34B, there may be feedback signals destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 16B)

[0590] Furthermore, in the above example, as shown in Figures 34A and 34B, base station #1 of 901_1 sends "feedback signal (1) addressed to terminal #1 of 3411_11" and "feedback signal (2) addressed to terminal #1 of 3411_12" to terminal #1 of 902_1. However, base station #1 of 901_1 may send three or more feedback signals to terminal #1 of 902_1.

[0591] Figures 35A and 35B show an example of the configuration of frame group 2703 containing data symbols transmitted by base station #1 of 901_1, in the time interval from t4 to t5 in Figure 27. In Figures 35A and 35B, the horizontal axis represents time and the vertical axis represents frequency. In Figures 35A and 35B, as in Figure 17A, the frame group 2703 containing data symbols has a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0592] Figures 35A and 35B deal with modulated signals (slots) destined for terminal #1 of 902_1. However, although not shown in Figures 35A and 35B, modulated signals (slots) destined for terminals other than terminal #1 of 902_1 may also exist.

[0593] In this example, since the "number of time divisions to which a reference signal for a sectus sweep can be transmitted when a terminal transmits a reference signal for a sectus sweep" is 4, the frame group 2703 containing data symbols has a modulated signal (slot) (1) addressed to terminal #1 of 3511_11 in the frequency band ♭K of the first transmission section, as shown in Figure 35A, and a modulated signal (slot) (2) addressed to terminal #1 of 3511_12 in the frequency band ♭2 of the third transmission section, as shown in Figure 35B.

[0594] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits a reference signal 1401_1 for sect sweeping, base station #1 of 901_1 transmits the "modulated signal (slot) (1) for terminal #1 of 3511_11" located in the frequency band ♭K of the first transmission section, as shown in Figure 35A, and the "modulated signal (slot) (2) for terminal #1 of 3511_12" located in the frequency band ♭2 of the third transmission section, as shown in Figure 35B. At this time, the "modulated signal (slot) (1) for terminal #1 of 3511_11" is transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1, and the "modulated signal (slot) (2) for terminal #1 of 3511_12" is transmitted from the 106_2 transmitting panel antenna 2 of base station #1 of 901_1.

[0595] Thus, the existence of "modulated signal (slot) (1) for terminal #1 of 3511_11" and "modulated signal (slot) (2) for terminal #1 of 3511_12" is because "base station #1 of 901_1 transmits two modulated signals (streams) to terminal #1 of 902_1".

[0596] In this case, the "modulated signal (slot) (1) of 3511_11 addressed to terminal #1" is assumed to include, for example, a data symbol (data, information) addressed to terminal #1 of 902_1.

[0597] In addition, the "modulated signal (slot) (2) for terminal #1 of 3511_12" also includes, for example, a data symbol (data, information) for terminal #1 of 902_1.

[0598] Based on the information transmitted by terminal #1 of 902_1 regarding the two best receiving quality transmission panel antennas and parameters of base station #1 of 901_1, and frequency (band) information, base station #1 of 901_1 selects a transmission panel antenna, sets the beamforming parameters, and transmits to terminal #1 of 902_1 the modulation signal (slot) (1) addressed to terminal #1 of 3511_11 located in the frequency band ♭K of the first transmission section, as shown in Figure 35A, and the modulation signal (slot) (2) addressed to terminal #1 of 3511_12 located in the frequency band ♭2 of the third transmission section, as shown in Figure 35B.

[0599] Furthermore, in Figures 35A and 35B, there may be modulated signals (slots) destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 17B)

[0600] Furthermore, in the above example, as shown in Figures 35A and 35B, base station #1 of 901_1 transmits "modulated signal (slot) (1) addressed to terminal #1 of 3511_11" and "modulated signal (slot) (2) addressed to terminal #1 of 3511_12" to terminal #1 of 902_1. However, base station #1 of 901_1 may transmit three or more modulated signals (slots) (modulated signals (slots) using multiple frequency and time resources) to terminal #1 of 902_1.

[0601] Furthermore, in "3511_11 modulated signal (slot) (1)" and "3511_12 modulated signal (slot) (2)," in addition to data symbols, other symbols may be included, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information. Symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and MCS information.

[0602] <Case 5> Figure 36 shows an example of the configuration of the feedback signal group 2702 transmitted by base station #1 of 901_1 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 the sake of simplicity, base station #1 of 901_1 is assumed to be equipped with four transmitting panel antennas: transmitting panel antenna 1 of 106_1, transmitting panel antenna 2 of 106_2, transmitting panel antenna 3 of 106_3, and transmitting panel antenna 4 of 106_4. In Figure 36, as in Figure 16A, the feedback signal group 2702 is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0603] Note that Figure 36 only deals with the feedback signal destined for terminal #1 of 902_1. However, although not shown in Figure 36, feedback signals destined for terminals other than terminal #1 of 902_1 may also exist.

[0604] In this example, since the "number of time divisions to which a reference signal for sectus sweep can be transmitted when a terminal transmits a reference signal for sectus sweep" is 4, the feedback signal group 2702 contains, as shown in Figure 36, a feedback signal (1) addressed to terminal #1 of 3611_11 in the frequency band ♭K of the first transmission section, and a feedback signal (2) addressed to terminal #1 of 3611_12 in the frequency band ♭2 of the first transmission section.

[0605] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits the secta sweep reference signal 1401_1, base station #1 of 901_1 transmits the "feedback signal (1) for terminal #1 of 3611_11" located in frequency band ♭K of the first transmission section, and the "feedback signal (2) for terminal #1 of 3611_12" located in frequency band ♭2 of the first transmission section, to terminal #1 of 902_1, as shown in Figure 36. At this time, both the "feedback signal (1) for terminal #1 of 3611_11" and the "feedback signal (2) for terminal #1 of 3611_12" are assumed to be transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1. (That is, one transmitting panel antenna is selected.)

[0606] Thus, the existence of "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".

[0607] At this time, the "feedback signal (1) addressed to terminal #1 of 3611_11" and the "feedback signal (2) addressed to terminal #1 of 3611_12" are assumed to contain information that, for example, terminal #1 of 902_1 and (base station #1 of 901_1) can communicate using the transmitting panel antenna 1 of 106_1.

[0608] Based on the information transmitted by terminal #1 of 902_1 regarding the transmission panel antennas and parameters of base station #1 of 901_1, and the frequency (band) information, base station #1 of 901_1 selects the transmission panel antenna and sets the beamforming parameters. As shown in Figure 36, base station #1 of 901_1 transmits a feedback signal (1) addressed to terminal #1 of 3611_11, located in the frequency band ♭K of the first transmission section, and a feedback signal (2) addressed to terminal #1 of 3611_12, located in the frequency band ♭2 of the first transmission section, to terminal #1 of 902_1.

[0609] Furthermore, in Figure 36, there may be feedback signals destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 16B)

[0610] Furthermore, in the example described above, as shown in Figure 36, base station #1 of 901_1 sends "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. However, base station #1 of 901_1 may send three or more feedback signals to terminal #1 of 902_1.

[0611] Figure 37 shows an example of the configuration of frame group 2703 containing data symbols transmitted by base station #1 of 901_1, in the time interval from t4 to t5 in Figure 27. 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 containing data symbols has a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0612] Note that Figure 37 deals with the modulated signal (slot) destined for terminal #1 of 902_1. However, although not shown in Figure 37, modulated signals (slots) destined for terminals other than terminal #1 of 902_1 may also exist.

[0613] In this example, since the "number of time divisions to which a reference signal for a sectus sweep can be transmitted when a terminal transmits a reference signal for a sectus sweep" is 4, the frame group 2703 containing data symbols has a modulated signal (slot) (1) addressed to terminal #1 of 3711_11 in the frequency band ♭K of the first transmission section, and a modulated signal (slot) (2) addressed to terminal #1 of 3711_12 in the frequency band ♭2 of the first transmission section, as shown in Figure 37.

[0614] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits the secta sweep reference signal 1401_1, base station #1 of 901_1 transmits the "modulated signal (slot) (1) for terminal #1 of 3711_11" located in the frequency band ♭K of the first transmission section, and the "modulated signal (slot) (2) for terminal #1 of 3711_12" located in the frequency band ♭2 of the first transmission section, to terminal #1 of 902_1, as shown in Figure 37. At this time, the "modulated signal (slot) (1) for terminal #1 of 3711_11" and the "modulated signal (slot) (2) for terminal #1 of 3711_12" are assumed to be transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1. (That is, one transmitting panel antenna is selected.)

[0615] Thus, the existence of "modulated signal (slot) (1) for terminal #1 of 3711_11" and "modulated signal (slot) (2) for terminal #1 of 3711_12" is because "base station #1 of 901_1 transmits two resources (slots) to terminal #1 of 902_1".

[0616] In this case, the "modulated signal (slot) (1) for terminal #1 of 3711_11" and the "modulated signal (slot) (2) for terminal #1 of 3711_12" are assumed to contain, for example, data symbols (data, information) addressed to terminal #1 of 902_1.

[0617] Based on the information transmitted by terminal #1 of 902_1 regarding the two best receiving quality transmission panel antennas and parameters of base station #1 of 901_1, and frequency (band) information, base station #1 of 901_1 selects a transmission panel antenna, sets the beamforming parameters, and transmits to terminal #1 of 902_1 the modulation signal (slot) (1) for terminal #1 of 3711_11 located in frequency band ♭K of the first transmission section, and the modulation signal (slot) (2) for terminal #1 of 3711_12 located in frequency band ♭2 of the first transmission section, as shown in Figure 37.

[0618] Furthermore, in Figure 37, there may be modulated signals (slots) destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 17B)

[0619] Furthermore, in the example described above, as shown in Figure 37, base station #1 of 901_1 transmits "modulated signal (slot) (1) addressed to terminal #1 of 3711_11" and "modulated signal (slot) (2) addressed to terminal #1 of 3711_12" to terminal #1 of 902_1. However, 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.

[0620] Furthermore, in "3711_11 modulated signal (slot) (1)" and "3711_12 modulated signal (slot) (2)," in addition to data symbols, other symbols may be included, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information. Symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and MCS information.

[0621] <Case 6> Figure 38 shows an example of the configuration of the feedback signal group 2702 transmitted by base station #1 of 901_1 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 the sake of simplicity, base station #1 of 901_1 is assumed to be equipped with four transmitting panel antennas: transmitting panel antenna 1 of 106_1, transmitting panel antenna 2 of 106_2, transmitting panel antenna 3 of 106_3, and transmitting panel antenna 4 of 106_4. In Figure 38, as in Figure 16A, the feedback signal group 2702 is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0622] Note that Figure 38 only deals with the feedback signal destined for terminal #1 of 902_1. However, although not shown in Figure 38, feedback signals destined for terminals other than terminal #1 of 902_1 may also exist.

[0623] In this example, since the "number of time divisions to which a reference signal for sectus sweep can be transmitted when a terminal transmits a reference signal for sectus sweep" is 4, the feedback signal group 2702 contains, as shown in Figure 38, a feedback signal (1) addressed to terminal #1 of 3811_11 in the frequency band ♭K of the first transmission section, and a feedback signal (2) addressed to terminal #1 of 3811_12 in the frequency band ♭K of the third transmission section.

[0624] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits the secta sweep reference signal 1401_1, base station #1 of 901_1 transmits the "feedback signal (1) for terminal #1 of 3811_11" located in the frequency band ♭K of the first transmission section, and the "feedback signal (2) for terminal #1 of 3811_12" located in the frequency band ♭K of the third transmission section, to terminal #1 of 902_1, as shown in Figure 38. At this time, both the "feedback signal (1) for terminal #1 of 3811_11" and the "feedback signal (2) for terminal #1 of 3811_12" are assumed to be transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1. (That is, one transmitting panel antenna is selected.)

[0625] Thus, the existence of "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".

[0626] At this time, the "feedback signal (1) addressed to terminal #1 of 3811_11" and the "feedback signal (2) addressed to terminal #1 of 3811_12" are assumed to contain information that, for example, terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 1 of 106_1.

[0627] Based on the information transmitted by terminal #1 of 902_1 regarding the transmission panel antennas and parameters of base station #1 of 901_1, as well as frequency (band) information, base station #1 of 901_1 selects the transmission panel antenna and sets the beamforming parameters. As shown in Figure 38, base station #1 of 901_1 transmits the feedback signal (1) addressed to terminal #1 of 3811_11, which is located in the frequency band ♭K of the first transmission section, and the feedback signal (2) addressed to terminal #1 of 3811_12, which is located in the frequency band ♭K of the third transmission section, to terminal #1 of 902_1.

[0628] Furthermore, in Figure 38, there may be feedback signals destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 16B.)

[0629] Furthermore, in the example described above, as shown in Figure 38, base station #1 of 901_1 sends "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. However, base station #1 of 901_1 may send three or more feedback signals to terminal #1 of 902_1.

[0630] Figure 39 shows an example of the configuration of frame group 2703 containing data symbols transmitted by base station #1 of 901_1, in the time interval from t4 to t5 in Figure 27. 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 containing data symbols has a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0631] Note that Figure 39 deals with the modulated signal (slot) destined for terminal #1 of 902_1. However, although not shown in Figure 39, modulated signals (slots) destined for terminals other than terminal #1 of 902_1 may also exist.

[0632] In this example, since the "number of time divisions to which a reference signal for a sectus sweep can be transmitted when a terminal transmits a reference signal for a sectus sweep" is 4, the frame group 2703 containing data symbols has a modulated signal (slot) (1) addressed to terminal #1 of 3911_11 in the frequency band ♭K of the first transmission section, and a modulated signal (slot) (2) addressed to terminal #1 of 3911_12 in the frequency band ♭K of the third transmission section, as shown in Figure 39.

[0633] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits the secta sweep reference signal 1401_1, base station #1 of 901_1 transmits the "modulated signal (slot) (1) for terminal #1 of 3911_11" located in the frequency band ♭K of the first transmission section, and the "modulated signal (slot) (2) for terminal #1 of 3911_12" located in the frequency band ♭K of the third transmission section, to terminal #1 of 902_1, as shown in Figure 39. At this time, the "modulated signal (slot) (1) for terminal #1 of 3911_11" and the "modulated signal (slot) (2) for terminal #1 of 3911_12" are assumed to be transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1. (That is, one transmitting panel antenna is selected.)

[0634] Thus, the existence of "modulated signal (slot) (1) for terminal #1 of 3911_11" and "modulated signal (slot) (2) for terminal #1 of 3911_12" is because "base station #1 of 901_1 transmits two resources (slots) to terminal #1 of 902_1".

[0635] In this case, the "modulated signal (slot) (1) for terminal #1 of 3911_11" and the "modulated signal (slot) (2) for terminal #1 of 3911_12" are assumed to contain, for example, data symbols (data, information) addressed to terminal #1 of 902_1.

[0636] Based on the information transmitted by terminal #1 of 902_1 regarding the two best receiving quality "transmitting panel antennas and parameters" of base station #1 of 901_1, and frequency (band) information, base station #1 of 901_1 selects a transmitting panel antenna, sets the beamforming parameters, and transmits to terminal #1 of 902_1 the "modulated signal (slot) (1) addressed to terminal #1 of 3911_11" located in the frequency band ♭K of the first transmission section, and the "modulated signal (slot) (2) addressed to terminal #1 of 3911_12" located in the frequency band ♭K of the third transmission section, as shown in Figure 39.

[0637] Furthermore, in Figure 39, there may be modulated signals (slots) destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 17B)

[0638] Furthermore, in the example described above, as shown in Figure 39, base station #1 of 901_1 transmits "modulated signal (slot) (1) addressed to terminal #1 of 3911_11" and "modulated signal (slot) (2) addressed to terminal #1 of 3911_12" to terminal #1 of 902_1. However, 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.

[0639] Furthermore, in "3911_11 modulated signal (slot) (1)" and "3911_12 modulated signal (slot) (2)," in addition to data symbols, other symbols may be included, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information. Symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and MCS information.

[0640] <Case 7> Figure 40 shows an example of the configuration of the feedback signal group 2702 transmitted by base station #1 of 901_1 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 the sake of simplicity, base station #1 of 901_1 is assumed to be equipped with four transmitting panel antennas: transmitting panel antenna 1 of 106_1, transmitting panel antenna 2 of 106_2, transmitting panel antenna 3 of 106_3, and transmitting panel antenna 4 of 106_4. In Figure 40, as in Figure 16A, the feedback signal group 2702 is assumed to have a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0641] Note that Figure 40 only deals with the feedback signal destined for terminal #1 of 902_1. However, although not shown in Figure 40, there may be feedback signals destined for terminals other than terminal #1 of 902_1.

[0642] In this example, since the "number of time divisions to which a reference signal for sectus sweep can be transmitted when a terminal transmits a reference signal for sectus sweep" is 4, the feedback signal group 2702 contains, as shown in Figure 40, a feedback signal (1) addressed to terminal #1 of 4011_11 in the frequency band ♭K of the first transmission section, and a feedback signal (2) addressed to terminal #1 of 4011_12 in the frequency band ♭2 of the third transmission section.

[0643] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits the secta sweep reference signal 1401_1, base station #1 of 901_1 transmits the "feedback signal (1) for terminal #1 of 4011_11" located in the frequency band ♭K of the first transmission section, and the "feedback signal (2) for terminal #1 of 4011_12" located in the frequency band ♭2 of the third transmission section, to terminal #1 of 902_1, as shown in Figure 40. At this time, both the "feedback signal (1) for terminal #1 of 4011_11" and the "feedback signal (2) for terminal #1 of 4011_12" are assumed to be transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1. (That is, one transmitting panel antenna is selected.)

[0644] Thus, the existence of "feedback signal (1) for terminal #1 of 4011_11" and "feedback signal (2) for terminal #1 of 4011_12" is because "base station #1 of 901_1 transmits two resources (slots) to terminal #1 of 902_1".

[0645] At this time, the "feedback signal (1) for terminal #1 of 4011_11" and the "feedback signal (2) for terminal #1 of 4011_12" are assumed to contain information that, for example, terminal #1 of 902_1 and base station #1 of 901_1 can communicate using the transmitting panel antenna 1 of 106_1.

[0646] Based on the information transmitted by terminal #1 of 902_1 regarding the transmission panel antennas and parameters of base station #1 of 901_1, as well as frequency (band) information, base station #1 of 901_1 selects the transmission panel antenna and sets the beamforming parameters. As shown in Figure 40, base station #1 of 901_1 transmits a feedback signal (1) addressed to terminal #1 of 4011_11, located in the frequency band ♭K of the first transmission section, and a feedback signal (2) addressed to terminal #1 of 4011_12, located in the frequency band ♭2 of the third transmission section, to terminal #1 of 902_1.

[0647] Furthermore, in Figure 40, there may be feedback signals destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 16B.)

[0648] Furthermore, in the example described above, as shown in Figure 40, base station #1 of 901_1 sends "feedback signal (1) addressed to terminal #1 of 4011_11" and "feedback signal (2) addressed to terminal #1 of 4011_12" to terminal #1 of 902_1. However, base station #1 of 901_1 may send three or more feedback signals to terminal #1 of 902_1.

[0649] Figure 41 shows an example of the configuration of frame group 2703 containing data symbols transmitted by base station #1 of 901_1, in the time interval from t4 to t5 in Figure 27. In Figure 41, the horizontal axis represents time and the vertical axis represents frequency. In Figure 41, as in Figure 17A, the frame group 2703 containing data symbols has a first transmission section, a second transmission section, a third transmission section, and a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0650] Note that Figure 41 deals with the modulated signal (slot) destined for terminal #1 of 902_1. However, although not shown in Figure 41, modulated signals (slots) destined for terminals other than terminal #1 of 902_1 may also exist.

[0651] In this example, since the "number of time divisions to which a reference signal for a sectus sweep can be transmitted when a terminal transmits a reference signal for a sectus sweep" is 4, the frame group 2703 containing data symbols has a modulated signal (slot) (1) addressed to terminal #1 of 4111_11 in the frequency band ♭K of the first transmission section, and a modulated signal (slot) (2) addressed to terminal #1 of 4111_12 in the frequency band ♭2 of the third transmission section, as shown in Figure 41.

[0652] For example, as shown in Figure 14, when terminal #1 of 902_1 transmits the secta sweep reference signal 1401_1, base station #1 of 901_1 transmits the "modulated signal (slot) (1) for terminal #1 of 4111_11" located in the frequency band ♭K of the first transmission section, and the "modulated signal (slot) (2) for terminal #1 of 4111_12" located in the frequency band ♭2 of the third transmission section, to terminal #1 of 902_1, as shown in Figure 41. At this time, it is assumed that the "modulated signal (slot) (1) for terminal #1 of 4111_11" and the "modulated signal (slot) (2) for terminal #1 of 4111_12" are transmitted from the 106_1 transmitting panel antenna 1 of base station #1 of 901_1. (That is, one transmitting panel antenna is selected.)

[0653] Thus, the existence of "modulated signal (slot) (1) for terminal #1 of 4111_11" and "modulated signal (slot) (2) for terminal #1 of 4111_12" is because "base station #1 of 901_1 transmits two resources (slots) to terminal #1 of 902_1".

[0654] In this case, the "modulated signal (slot) (1) for terminal #1 of 4111_11" and the "modulated signal (slot) (2) for terminal #1 of 4111_12" are assumed to contain, for example, data symbols (data, information) addressed to terminal #1 of 902_1.

[0655] Based on the information transmitted by terminal #1 of 902_1 regarding the two best receiving quality transmission panel antennas and parameters of base station #1 of 901_1, and frequency (band) information, base station #1 of 901_1 selects a transmission panel antenna, sets the beamforming parameters, and transmits to terminal #1 of 902_1 the modulation signal (slot) (1) addressed to terminal #1 of 4111_11 located in the frequency band ♭K of the first transmission section, and the modulation signal (slot) (2) addressed to terminal #1 of 4111_12 located in the frequency band ♭2 of the third transmission section, as shown in Figure 41.

[0656] Furthermore, in Figure 41, there may be modulated signals (slots) destined for terminals other than terminal #1 of 902_1. (See, for example, Figure 17B)

[0657] Furthermore, in the example described above, as shown in Figure 41, base station #1 of 901_1 transmits "modulated signal (slot) (1) addressed to terminal #1 of 4111_11" and "modulated signal (slot) (2) addressed to terminal #1 of 4111_12" to terminal #1 of 902_1. However, base station #1 of 901_1 may transmit three or more modulated signals (slots) (modulated signals (slots) using multiple frequency and time resources) to terminal #1 of 902_1.

[0658] Furthermore, in "4111_11 modulated signal (slot) (1)" and "4111_12 modulated signal (slot) (2)," in addition to data symbols, other symbols may be included, for example, "reference signals such as DMRS, PTRS, and SRS," pilot symbols, pilot signals, preambles, and symbols containing control information. Symbols containing control information may include information about the destination terminal (an ID that can identify the terminal), the method of transmitting the modulated signal, information about the modulation scheme, information about the error correction coding scheme (code length, coding rate, etc.), and MCS information.

[0659] As described above, by transmitting modulated signals as shown in Case 1 to Case 7, for example, interference between modulated signals can be reduced, and by efficiently allocating modulated signals and slots, the data transmission efficiency can be improved.

[0660] Furthermore, 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 one of the communication methods from <Case 1> to <Case 7> depending on the radio wave propagation environment, communication conditions, etc.

[0661] Figure 42 shows an example of the situation when base station #1 of 901_1 and "terminals such as terminal #1 of 902_1" are communicating in Figure 9. Figure 42(A) shows an example of the transmission status of the modulated signal of base station #1 of 901_1, and Figure 42(B) shows an example of the transmission status of the modulated signal of "terminals such as terminal #1 of 902_1". In Figures 42(A) and 42(B), the horizontal axis represents time. In Figure 42, components that operate in the same way as in Figure 18 are given the same number.

[0662] First, base station #1 of 901_1 transmits the reference signal 1801_1 for secta sweep. This point has already been explained using Figure 27, so the explanation will be omitted here.

[0663] Then, "terminal #1 of 902_1, etc." transmits the secta sweep reference signal 1851_1. This point has already been explained using Figures 13 and 14, so the explanation will be omitted here.

[0664] Base station #1 of 901_1 transmits feedback signal group 4202_1. This point has already been explained using Figures 28A, 28B, 30A, 30B, 32A, 32B, 34A, 34B, 36, 38, and 40, so the explanation will be omitted here.

[0665] Subsequently, base station #1 of 901_1 transmits "frame group 4203_1 containing data symbols." This point has already been explained using Figures 29A, 29B, 31A, 31B, 33A, 33B, 35A, 35B, 37, 39, and 41, so the explanation will be omitted here. (Therefore, "frame 4203_1 containing data symbols" can be considered, for example, a downlink frame.)

[0666] Then, "a terminal such as terminal #1 of 902_1" transmits "frame group 4252_1 containing data symbols." The structure of this frame will be explained later using "Figures 44A, 44B," "Figures 45A, 45B," "Figures 46A, 46B," "Figures 47A, 47B," "Figure 48," "Figure 49," and "Figure 50." (Therefore, "frame group 4252_1 containing data symbols" can be considered, for example, as an uplink frame.)

[0667] Next, base station #1 of 901_1 transmits "frame group 4203_2 including data symbols". The configuration method of "frame group 4203_2 including data symbols" is as explained using Figures 29A, 29B, 31A, 31B, 33A, 33B, 35A, 35B, 37, 39, and 41.

[0668] Then, terminals such as "Terminal #1 of 902_1" and "Terminal #2 of 902_2" transmit "frame group 4252_2 containing data symbols." The structure of this frame will be explained later using "Figures 44A, 44B," "Figures 45A, 45B," "Figures 46A, 46B," "Figures 47A, 47B," "Figure 48," "Figure 49," and "Figure 50."

[0669] Figure 43 shows examples of the transmission status of modulated signals from base station #1 of 901_1 and terminals such as terminal #1 of 902_1, as shown in Figures 42 and later. In Figure 43, components that operate similarly to those in Figure 18 are given the same numbers.

[0670] Figure 43(A) shows an example of the transmission status of the modulated signal from base station #1 of 901_1, and is a temporal continuation of the transmission status of the modulated signal from base station #1 of 901_1 shown in Figure 42(A).

[0671] Figure 43(B) shows an example of the transmission status of modulated signals at "Terminal #1 of 902_1 and Terminal #2 of 902_2," and is a chronological continuation of the transmission status of modulated signals at "Terminal #1 of 902_1 and other terminals" shown in Figure 42(B).

[0672] In Figures 43(A) and 43(B), the horizontal axis represents time.

[0673] Following Figures 42(A) and (B), base station #1 of 901_1 transmits "frame group 4203_3 containing data symbols". The configuration method of "frame group 4203_3 containing data symbols" is as explained using Figures 29A, 29B, 31A, 31B, 33A, 33B, 35A, 35B, 37, 39, and 41.

[0674] Then, "terminal #1 of 902_1" transmits "frame group 4252_3 containing data symbols". The structure of this frame will be explained later using "Figures 44A, 44B", "Figures 45A, 45B", "Figures 46A, 46B", "Figures 47A, 47B", "Figure 48", "Figure 49", and "Figure 50".

[0675] Next, base station #1 of 901_1 transmits the reference signal 1801_2 for secta sweep. This has already been explained using Figure 27, so the explanation will be omitted here.

[0676] Then, "terminal #1 of 902_1, etc." transmits the secta sweep reference signal 1851_2. This point has already been explained using Figures 13 and 14, so the explanation will be omitted here.

[0677] Base station #1 of 901_1 transmits feedback signal group 4202_2. This point has already been explained using Figures 28A, 28B, 30A, 30B, 32A, 32B, 34A, 34B, 36, 38, and 40, so the explanation will be omitted here.

[0678] Subsequently, base station #1 of 901_1 transmits "frame group 4203_4 including data symbols". This point has already been explained using Figures 29A, 29B, 31A, 31B, 33A, 33B, 35A, 35B, 37, 39, and 41, so the explanation will be omitted here.

[0679] Then, "terminal #1 of 902_1" transmits "frame group 4252_4 containing data symbols". The structure of this frame will be explained later using "Figures 44A, 44B", "Figures 45A, 45B", "Figures 46A, 46B", "Figures 47A, 47B", "Figure 48", "Figure 49", and "Figure 50".

[0680] In this way, before the transmission of "frames containing data symbols" by base station #1 of 901_1 and / or the transmission of "frames containing data symbols" by terminals such as terminal #1 of 902_1 and terminal #2 of 902_2", base station #1 of 901_1 and the terminal transmit a reference signal for sect sweeping. After the transmission of "frames containing data symbols" by base station #1 of 901_1 and / or the transmission of "frames containing data symbols" by terminals such as terminal #1 of 902_1 and terminal #2 of 902_2", the base station and / or terminal transmit another reference signal for sect sweeping, and by selecting the transmitting panel antenna to be used and setting the transmitting beamforming, the base station and / or terminal can obtain the effect of obtaining high data reception quality.

[0681] Next, we will explain an example of the structure of "frame group 4252_i containing data symbols" transmitted by terminals such as "terminal #1 of 902_1" and "terminal #2 of 902_2". For example, i is an integer of 1 or greater.

[0682] As previously explained, terminal #i of 902_i shall have the configurations shown in Figures 1A, 1B, and 1C. Furthermore, terminal #i of 902_i having the configurations shown in Figures 1A, 1B, and 1C shall have the configuration shown in Figure 3 as the transmitting panel antenna xi of 106_xi. However, the configuration of terminal #i of 902_i is not limited to the configurations shown in Figures 1A, 1B, and 1C, and the configuration of the transmitting panel antenna xi of 106_xi of terminal #i of 902_i having the configurations shown in Figures 1A, 1B, and 1C is not limited to Figure 3.

[0683] The following sections will explain several cases.

[0684] <Case A1> Figures 44A and 44B show an example of the configuration of "frame group 4252_i containing data symbols". In Figures 44A and 44B, the horizontal axis represents time and the vertical axis represents frequency. For the sake of simplicity, terminal #1 of 902_1 is assumed to be equipped with four transmitting panel antennas: transmitting panel antenna 1 of 106_1, transmitting panel antenna 2 of 106_2, transmitting panel antenna 3 of 106_3, and transmitting panel antenna 4 of 106_4. In Figures 44A and 44B, as in Figures 20A, 20B, 20C, 20D, 20E, and 20F, "frame group 4252_i containing data symbols" is assumed to have a first transmission section, a second transmission section, a third transmission section, a fourth transmission section, and frequency bands ♭1, ♭2, ..., and ♭K.

[0685] Note that Figures 44A and 44B deal with frames (slots, modulated signals) transmitted by terminal #1 of 902_1. However, although not shown in Figures 44A and 44B, frames (slots, modulated signals) transmitted by terminals other than terminal #1 of 902_1 may also exist. (See Figures 20A, 20B, 20C, 20D, 20E, and 20F)

[0686] In this example, the frame group 4252_i containing data symbols includes, as shown in Figure 44A, the "4411_11 terminal #1 transmission frame (1)" transmitted by terminal #1 of 902_1, which is located in the frequency band ♭K of the first transmission section, and as shown in Figure 44B, the "4411_12 terminal #1 transmission frame (2)" transmitted by terminal #1 of 902_1, which is located in the frequency band ♭K of the first transmission section.

[0687] The reason why this is referred to as a group of frames containing data symbols is that it allows for the existence of "frames containing data symbols" transmitted from the transmitting panel antenna 1 of 106_1, as well as from the transmitting panel antenna 2 of 106_2, as well as from the transmitting panel antenna 3 of 106_3, and as well as from the transmitting panel antenna 4 of 106_4, all within the same frequency band and transmission section.

[0688] For example, terminal #1 of 902_1 transmits "terminal #1 transmission frame (1) of 4411_11" which is in the frequency band ♭K of the first transmission section, as shown in Figure 44A, and "terminal #1 transmission frame (2) of 4411_12" which is in the frequency band ♭K of the first transmission section, as shown in Figure 44B, to base station #1 of 901_1. At this time, "terminal #1 transmission frame (1) of 4411_11" is transmitted from the 106_1 transmission panel antenna 1 of terminal #1 of 902_1, and "terminal #1 transmission frame (2) of 4411_12" is transmitted from the 106_2 transmission panel antenna 2 of terminal #1 of 902_1.

[0689] Thus, the existence of "4411_11 terminal #1 transmission frame (1)" and "4411_12 terminal #1 transmission frame (2)" is because "terminal #1 of 902_1 transmits two modulated signals (streams) to base station #1 of 901_1".

[0690] In this case, the "4411_11 terminal #1 transmission frame (1)" is assumed to contain, for example, a data symbol (data, information) destined for base station #1 of 901_1.

[0691] In addition, the "4411_12 terminal #1 transmission frame (...

Claims

1. A receiving unit that receives the first signal transmitted from a first panel antenna or the second signal transmitted from a second panel antenna, based on a method selected from a first method in which the first signal and the second signal are mapped to different frequencies at the same time, a second method in which the first signal and the second signal are mapped to two partially overlapping frequencies at the same time, and a third method in which the first signal and the second signal are mapped to the same frequency at the same time. A circuit for decoding the first signal or the second signal, Equipped with, The first signal transmitted from the first panel antenna is transmitted on the first beam and is positioned at the same time, and the second signal transmitted from the second panel antenna is transmitted on the second beam. Information regarding the first beam and information regarding the second beam are transmitted to the terminal. Base station.

2. If the third method is selected, the same time and the same frequency are as instructed by the base station. The base station according to claim 1.

3. The first signal and the second signal are transmitted separately to two transmission / reception points. The base station according to claim 1.

4. The first signal is transmitted based on the first beam, The second signal is transmitted based on the second beam, which is different from the first beam. The base station according to claim 1.

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

6. The information regarding the first beam and the information regarding the second beam are transmitted in the same time signal. The base station according to claim 1.

7. The first signal transmitted from the first panel antenna or the second signal transmitted from the second panel antenna is received based on a method selected from a first method in which the first signal and the second signal are mapped to different frequencies at the same time, a second method in which the first signal and the second signal are mapped to two partially overlapping frequencies at the same time, and a third method in which the first signal and the second signal are mapped to the same frequency at the same time. Decode the first signal or the second signal, The first signal transmitted from the first panel antenna is transmitted on the first beam and is positioned at the same time, and the second signal transmitted from the second panel antenna is transmitted on the second beam. Information regarding the first beam and information regarding the second beam are transmitted to the terminal. Communication method.

8. If the third method is selected, the same time and the same frequency are instructed by the base station. The communication method according to claim 7.

9. The first signal and the second signal are transmitted separately to two transmission / reception points. The communication method according to claim 7.

10. The first signal is transmitted based on the first beam, The second signal is transmitted based on the second beam, which is different from the first beam. The communication method according to claim 7.

11. Each of the first panel antenna and the second panel antenna is composed of one or more antennas. The communication method according to claim 7.

12. A process of receiving the first signal transmitted from a first panel antenna or the second signal transmitted from a second panel antenna, based on a method selected from a first method in which the first signal and the second signal are mapped to different frequencies at the same time, a second method in which the first signal and the second signal are mapped to two partially overlapping frequencies at the same time, and a third method in which the first signal and the second signal are mapped to the same frequency at the same time. Control the process of decoding the first signal or the second signal, The first signal transmitted from the first panel antenna is transmitted on the first beam and is positioned at the same time, and the second signal transmitted from the second panel antenna is transmitted on the second beam. Information regarding the first beam and information regarding the second beam are transmitted to the terminal. Integrated circuit.

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