Transmission method, control device, and transmission system

Abstract

The present application provides a transmission method, a control device, and a transmission system. The transmission method is implemented by a transmission system, which includes a first transmission device that transmits data to a receiving device when coordination is performed or not, and a second transmission device that transmits data to the receiving device when coordination is performed. The first transmission device transmits data to the receiving device, obtains communication quality information with the receiving device, and determines based on the communication quality information whether to perform coordination work in which the first and second transmission devices coordinate to transmit data. If coordination work is determined to be performed, the second transmission device transmits data through coordination work with the first transmission device. If coordination work is determined not to be performed, the second transmission device stops transmitting data based on coordination work. The receiving device is included in a receiving system including the second reception device. When coordination work is not performed, the second transmission device transmits data different from the data sent by the first transmission device to the second reception device.

Description

[0001] This application is a divisional application of the invention patent application with application date of June 15, 2016, application number 201680036115.3, and invention name “Transmitting method, transmitting device and communication system”. Technical Field

[0002] The present disclosure relates to wireless communication technology. Background Art

[0003] Wireless communications utilize various frequency bands. For example, wireless LANs based on IEEE 802.11g utilize a frequency band between 2.4 and 2.5 GHz, with a maximum transmission speed of 54 Mbps. Furthermore, mobile phones based on LTE utilize a frequency band between 2 GHz, with a maximum transmission speed of 112.5 Mbps.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-258736

[0007] Patent Document 2: Japanese Patent Application No. 2010-535450

[0008] Patent Document 3: Japanese Patent Application No. 2014-534678

[0009] In order to achieve transmission with a larger capacity, there is a demand for the introduction of wireless communications using frequencies of 6 GHz or higher, for example, frequency bands called millimeter waves. Summary of the Invention

[0010] Therefore, one of the embodiments of the present disclosure, for example, provides a sending method utilized in multiple sending devices, wherein the multiple sending devices utilize a millimeter wave frequency band to wirelessly send data to a receiving device. In the sending method, the communication quality with the receiving device is obtained, and when the obtained communication quality is less than a threshold value, the multiple sending devices coordinate and send data, and when the obtained communication quality is above the threshold value, the coordination work is stopped.

[0011] Furthermore, these general or specific aspects may be implemented by a system, a method, an integrated circuit, a computer program, or a recording medium, or by any combination of systems, devices, methods, integrated circuits, computer programs, and recording media.

[0012] According to a transmission method disclosed herein, the method is implemented by a transmission system that wirelessly transmits data to a receiving device. The transmission system includes a first transmission device that transmits data to the receiving device both when a coordinated operation is performed and when a coordinated operation is not performed, and a second transmission device that transmits data to the receiving device when a coordinated operation is performed. Data is transmitted from the first transmission device to the receiving device. In the transmission method, communication quality information indicating the communication quality with the receiving device is obtained. Based on the communication quality information, it is determined whether a coordinated operation is to be performed by the first and second transmission devices in coordination with each other to transmit data to the receiving device. If it is determined that a coordinated operation is to be performed, the second transmission device transmits data to the receiving device through a coordinated operation with the first transmission device. If it is determined that a coordinated operation is not to be performed, the second transmission device stops transmitting data based on the coordinated operation with the first transmission device. The receiving device is included in a receiving system including a second transmission device. When the coordinated operation is not performed, the second transmission device transmits data, among data transmitted to the receiving system, to the second reception device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a block diagram showing the configuration of the wireless communication system 100 according to the first embodiment.

[0014] Figure 2 is a block diagram showing the structure of the AP 120 .

[0015] Figure 3 is a block diagram showing the structure of the mother station 110.

[0016] Figure 4 This diagram shows an example of data to be transmitted when all four APs 121 , 122 , 123 , and 124 are set for multicast transmission.

[0017] Figure 5 This diagram shows an example of data to be transmitted when AP121 and AP122 are set for multicast and AP123 and AP124 are set for unicast transmission.

[0018] Figure 6 This diagram shows an example of data to be transmitted when AP121 and AP122 are set for multicast and AP123 and AP124 are set for unicast transmission.

[0019] Figure 7This diagram shows an example of data received when AP121 and AP122 are set for multicast and AP123 and AP124 are set for unicast.

[0020] Figure 8 This diagram shows an example of data received when AP121 and AP122 are set for multicast and AP123 and AP124 are set for unicast.

[0021] Figure 9 (A) is a diagram showing an example of a mapping method on the IQ plane of the in-phase component I and the quadrature component Q constituting a QPSK modulated signal. (B) is a diagram showing an example of a mapping method after a phase change.

[0022] Figure 10 This is a diagram showing the phase change of the phase change unit 1002.

[0023] Figure 11 This is a sequence diagram (No. 1) showing the operation of transmitting data packets by the mother station 110, AP 121, AP 122, AP 123, and AP 124 of the wireless communication system 100. Figure 12 .

[0024] Figure 12 This is a sequence diagram (second) showing the operation of transmitting data packets by the parent station 110 , AP 121 , AP 122 , AP 123 , and AP 124 of the wireless communication system 100 .

[0025] Figure 13 1 is a sequence diagram showing the operation of receiving a data packet by the parent station 110 , AP 121 , AP 122 , AP 123 , and AP 124 of the wireless communication system 100 .

[0026] Figure 14 This is a block diagram showing the structure of a wireless communication system 1400 according to modification (1).

[0027] Figure 15 This is a block diagram showing the configuration of a master station 1598 , AP 1599 - 1 , AP 1599 - 2 , AP 1599 - 3 , and AP 1599 - 4 of a wireless communication system 1500 according to modification ( 2 ).

[0028] Figure 16 This is a block diagram showing the configuration of a master station 1698 , AP 1699 - 1 , AP 1699 - 2 , AP 1699 - 3 , and AP 1699 - 4 of a wireless communication system 1600 according to modification ( 3 ).

[0029] Figure 171 is a diagram showing a flowchart of an operation when the master station 110 in the wireless communication system 100 controls a new AP.

[0030] Figure 18 This is a block diagram showing the structure of a wireless communication system 1800 according to the second embodiment.

[0031] Figure 19 1 is a block diagram showing the structure of AP 1820 - 1 serving as a master AP.

[0032] Figure 20 2 is a block diagram showing the structure of an AP 2000 that is not a master AP.

[0033] Figure 21 This diagram shows an example of data to be transmitted when all of APs 1820 - 1 , AP 1820 - 2 , AP 1820 - 3 , and AP 1820 - 4 are set for multicast transmission.

[0034] Figure 22 This diagram shows an example of data transmitted when AP1820-1 and AP1820-2 are set for multicast and AP1820-3 and AP1820-4 are set for unicast transmission.

[0035] Figure 23 This diagram shows an example of data to be transmitted when APs 1820 - 1 and 1820 - 2 are configured for multicast and APs 1820 - 3 and 1820 - 4 are configured for unicast transmission.

[0036] Figure 24 This is a diagram showing a flowchart of an operation in which the AP 1820 - 1 serving as the master AP in the wireless communication system 1800 controls a new AP.

[0037] Figure 25 This is a block diagram showing the structure of a wireless communication system 2500 according to the third embodiment.

[0038] Figure 26 is a block diagram showing the structure of AP2520.

[0039] Figure 27 is a block diagram showing the structure of the mother station 2510.

[0040] Figure 28 This diagram shows an example of data to be transmitted when all of AP2520-1, AP2520-2, AP2520-3, and AP2520-4 are set for multicast transmission.

[0041] Figure 29This is a diagram showing another example of data to be transmitted when all of AP2520-1, AP2520-2, AP2520-3, and AP2520-4 are set for multicast transmission.

[0042] Figure 30 This diagram shows an example of data to be transmitted when APs 2520 - 1 and 2520 - 2 are configured for multicast and APs 2520 - 3 and 2520 - 4 are configured for unicast transmission.

[0043] Figure 31 This diagram shows another example of data to be transmitted when APs 2520 - 1 and 2520 - 2 are configured for multicast and APs 2520 - 3 and 2520 - 4 are configured for unicast transmission.

[0044] Figure 32 This diagram shows another example of data to be transmitted when APs 2520 - 1 and 2520 - 2 are configured for multicast and APs 2520 - 3 and 2520 - 4 are configured for unicast transmission.

[0045] Figure 33 This diagram shows another example of data to be transmitted when APs 2520 - 1 and 2520 - 2 are configured for multicast and APs 2520 - 3 and 2520 - 4 are configured for unicast transmission.

[0046] Figure 34 This is a block diagram showing the structure of a wireless communication system 3400 according to a fourth embodiment.

[0047] Figure 35 This is a block diagram showing the structure of AP 3420 - 1 serving as a master AP.

[0048] Figure 36 This is a block diagram showing the structure of an AP 3600 that is not a master AP.

[0049] Figure 37 3410 is a block diagram showing the structure of the mother station 3410.

[0050] Figure 38 This diagram shows an example of data to be transmitted when all of AP3420-1, AP3420-2, AP3420-3, and AP3420-4 are set for multicast transmission.

[0051] Figure 39 This is a diagram showing another example of data to be transmitted when all of AP3420-1, AP3420-2, AP3420-3, and AP3420-4 are set for multicast transmission.

[0052] Figure 40This diagram shows an example of data to be transmitted when AP3420-1 and AP3420-2 are set for multicast and AP3420-3 and AP3420-4 are set for unicast transmission.

[0053] Figure 41 This diagram shows another example of data to be transmitted when AP3420-1 and AP3420-2 are set for multicast and AP3420-3 and AP3420-4 are set for unicast transmission.

[0054] Figure 42 This diagram shows an example of data to be transmitted when AP3420-1 and AP3420-2 are set for multicast and AP3420-3 and AP3420-4 are set for unicast transmission.

[0055] Figure 43 This diagram shows another example of data to be transmitted when AP3420-1 and AP3420-2 are set for multicast and AP3420-3 and AP3420-4 are set for unicast transmission.

[0056] Figure 44 This is a block diagram showing the structure of a wireless communication system 4400 according to the fifth embodiment.

[0057] Figure 45 This is a block diagram showing the structure of AP 4420 - 1 serving as a master AP.

[0058] Figure 46 This is a block diagram showing the structure of a non-master AP 4600.

[0059] Figure 47 This diagram shows an example of data transmitted when all of AP4420-1, AP4420-2, AP4420-3, and AP4420-4 are set to unicast transmission on a clear day.

[0060] Figure 48 This diagram shows an example of data to be transmitted when all of AP4420-1, AP4420-2, AP4420-3, and AP4420-4 are set to unicast transmission during rain.

[0061] Figure 49 This is a flowchart showing the operation of AP 4420 - 1 as the master AP. DETAILED DESCRIPTION

[0062] 1. Knowledge that forms the basis of this disclosure

[0063] For example, one approach to achieving high-capacity transmission in Gbps is to introduce wireless communication methods that utilize frequency bands such as millimeter waves. Millimeter-wave radio waves have the characteristics of strong linearity and rapid attenuation. Consequently, expanding the cell range within which these waves reach presents a challenge.

[0064] The inventors of this disclosure have recognized that it is difficult to implement a wireless communication system with a wide cell range using radio waves in the millimeter wave band. To address this issue, the inventors of this disclosure have proposed a new transmission method that enables wireless communication using radio waves in the millimeter wave band.

[0065] Furthermore, the inventors of this disclosure believe that there is a need to utilize millimeter wave band radio waves to achieve multicast or unicast communications. In particular, it is necessary to consider methods for accommodating multiple terminals in multicast. It is also believed that there is a need to achieve both multicast and unicast.

[0066] Furthermore, within a network, a method of sending data to a specific destination by specifying a single address is called unicast, and a method of sending data to multiple destinations by specifying multiple destinations is called multicast.

[0067] 2. Example 1

[0068] A wireless communication system 100 according to an embodiment of the present disclosure is described.

[0069] 2.1 Wireless Communication System 100

[0070] Wireless communication system 100, such as Figure 1 As shown, the system is composed of a mother station 110 , APs (Access Points) 121 , APs 122 , APs 123 , APs 124 , and terminals 131 , 132 , . . . , and 138 .

[0071] The mother station 110 is connected to a communication device (not shown) directly or indirectly via a communication line. Here, the communication device is, for example, a broadcasting device that broadcasts data, a distribution system that sends data, a server, etc. The communication device sends control signals and data. The control signal includes settings for a unicast transmission method or a multicast transmission method, as well as settings for a phase change method (this will be explained later). Furthermore, the communication device may be composed of a plurality of communication devices. In this case, the first communication device may also send a control signal, and the second communication device may also send data. The mother station 110 is connected to AP121, AP122, AP123, and AP124, for example, by wire. Furthermore, wireless connection is also possible.

[0072] The mother station 110 receives control signals and data from the communication device. The mother station 110 transmits control signals and data to APs 121, 122, 123, and 124, respectively. APs 121, 122, 123, and 124 wirelessly transmit the data received from the mother station 110.

[0073] Terminal 131, terminal 132, ..., terminal 138 are respectively mobile phones, smartphones, tablet computers, and personal computers (PCs) having wireless communication functions using a frequency band above 6 GHz, such as a frequency band called millimeter waves, for example, a frequency band of 60 GHz.

[0074] For example, when terminal 131 is located close to AP 121, terminal 131 wirelessly receives data from AP 121. Similarly to terminal 131, each of terminals 132, 133, ..., and 138 also wirelessly receives data from a nearby AP.

[0075] Then, the terminal 131 transmits data wirelessly. When the terminal 131 is located close to the AP 121, the AP 121 receives data wirelessly from the terminal 131. The AP 121 transmits the received data to the master station 110.

[0076] Terminals 132, 133, ..., and 138 also transmit data wirelessly, similarly to terminal 131. An AP located near each terminal wirelessly receives data from the terminal. The AP transmits the data received from the terminal to master station 110.

[0077] The mother station 110 receives data from each terminal via each AP and outputs the received data to the communication device.

[0078] 2.2AP120

[0079] AP121, AP122, AP123, and AP124 have, for example, the same structure (same function). Here, AP120 is described to represent AP121, AP122, AP123, and AP124.

[0080] AP120, such as Figure 2 As shown, it is composed of an encoder 202, an interleaver 204, a mapping unit 206, a phase change unit 208, a wireless unit 210, an antenna 212, an antenna 215 and a receiving device 217.

[0081] AP 120 receives control signal 214 from master station 110. Control signal 214 includes settings regarding a unicast transmission method or a multicast transmission method, and a phase change method.

[0082] AP 120 configures the unicast transmission method based on control signal 214 received from master station 110. Furthermore, AP 120 configures the phase change method based on control signal 214. Furthermore, when configured for multicast transmission, AP 120 is configured to use the same frequency (band) as other APs.

[0083] When the AP 120 is set to unicast transmission, the AP 120 operates the receiving device 217. Alternatively, when the AP 120 is set to multicast transmission, the AP 120 may stop the receiving device 217.

[0084] AP 120 uses the same channel (or frequency (band)) for wireless transmission and reception in both unicast and multicast transmissions. AP 120 may also divide a single wireless carrier into several time slots, using each time slot as a communication channel. Furthermore, AP 120 may use multiple different frequencies in the 60 GHz band, using each frequency as a communication channel.

[0085] (1) Encoder 202

[0086] Encoder 202 receives data 201 from parent station 110. Furthermore, encoder 202 receives control signal 213 from a controller included in AP 120. Control signal 213 includes information such as the encoding scheme, error correction scheme, coding rate, and block length. Encoder 202 performs error correction encoding on data 201 using the scheme specified by control signal 213, such as convolutional coding, LDPC coding, or turbo coding. Encoder 202 outputs encoded data 203.

[0087] (2) Interleaver 204

[0088] Interleaver 204 receives encoded data 203 from encoder 202. Furthermore, interleaver 204 receives control signal 213 from a controller included in AP 120. Control signal 213 specifies an interleaving method. Interleaver 204 interleaves, or rearranges, the sequence of encoded data 203 using the interleaving method specified by control signal 213. Interleaver 204 outputs interleaved data 205.

[0089] (3) Mapping Unit 206

[0090] Mapping unit 206 receives interleaved data 205 from interleaver 204. Mapping unit 206 also receives control signal 213 from a controller included in AP 120. Control signal 213 specifies a modulation scheme. Based on the modulation scheme specified in control signal 213, mapping unit 206 performs modulation on interleaved data 205 using a method such as QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation), or 64QAM (64 Quadrature Amplitude Modulation), generating a modulated signal 207 (modulation schemes are not limited to these). Mapping unit 206 then outputs modulated signal 207.

[0091] Furthermore, the mapping unit 206 may perform mapping including a phase change process.

[0092] (4) Phase Changing Unit 208

[0093] Phase changer 208 receives modulated signal 207 from mapping unit 206. Furthermore, phase changer 208 receives control signal 214. Control signal 214 includes a setting for a phase change method. Phase changer 208 performs a phase change on modulated signal 207 based on the phase change method setting included in control signal 214, generating phase-changed signal 209. Phase changer 208 outputs phase-changed signal 209.

[0094] (5) Wireless Unit 210 and Antenna 212

[0095] Radio unit 210 receives phase-changed signal 209 from phase changer 208. Furthermore, radio unit 210 receives control signal 213 from a controller included in AP 120. Control signal 213 includes instructions for frequency conversion, amplification, and the like. Radio unit 210 performs frequency conversion, amplification, and other processing on phase-changed signal 209 to generate transmit signal 211. Radio unit 210 outputs generated transmit signal 211 to antenna 212 using a frequency band above 6 GHz, such as millimeter waves, and, for example, a frequency band of 60 GHz.

[0096] The antenna 212 outputs the transmission signal 211 as radio waves.

[0097] (6) Antenna 215 and receiving device 217

[0098] Antenna 215 receives signal 216 output as radio waves from each terminal.

[0099] Receiver 217 receives signal 216 from antenna 215 using a frequency band above 6 GHz, such as millimeter waves, for example, a frequency band of 60 GHz, performs processing such as amplification and frequency conversion, and generates data 218. Receiver 217 outputs data 218 to master station 110.

[0100] Furthermore, antenna 212 and antenna 215 may be the same antenna, but are labeled differently for ease of description.

[0101] 2.3 Mother Station 110

[0102] The mother station 110, such as Figure 3 As shown, it is composed of a transmission data distribution unit 302, a reception data distribution unit 305 and an instruction unit 308.

[0103] (1) Instruction unit 308

[0104] The instruction unit 308 is connected to the communication device and AP121, AP122, AP123, and AP124.

[0105] Instruction unit 308 receives control signals from, for example, a communication device. These control signals include settings for unicast transmission, multicast transmission, and phase change methods. The communication device, for example, is a personal computer (or computer), and a user of the PC inputs control signals through the PC.

[0106] Furthermore, the control signal may be set individually for each AP, or the same control signal may be set for all APs.

[0107] You can set all APs to multicast, or you can set all APs to unicast. You can also set some APs to multicast, and others to unicast. In this way, you can mix multicast and unicast settings for each AP.

[0108] For multiple APs configured for multicast, the modulated signal before the phase change becomes the same. In other words, the same data is transmitted. Furthermore, the phase change method is instructed for each AP.

[0109] For multiple APs configured for unicast, the modulated signals before the phase change can be the same or different. In other words, they may send the same data or different data.

[0110] The instruction unit 308 outputs the received control signal to the transmission data allocation unit 302, the reception data allocation unit 305, and the APs 121, 122, 123, and 124.

[0111] (2) Transmission Data Distribution Unit 302

[0112] The transmission data distribution unit 302 is connected to the communication device, the instruction unit 308 , and the APs 121 , 122 , 123 , and 124 .

[0113] The transmission data allocation unit 302 receives the control signal from the instruction unit 308. The transmission data allocation unit 302 outputs the received control signal to the AP 121, AP 122, AP 123, and AP 124.

[0114] Furthermore, the transmission data distribution unit 302 receives data from the communication device and distributes the received data to AP 121, AP 122, AP 123, and AP 124. The transmission data distribution unit 302 outputs the distributed data to AP 121, AP 122, AP 123, and AP 124, respectively.

[0115] (3) Received Data Distribution Unit 305

[0116] The received data distribution unit 305 is connected to the communication device, the instruction unit 308 , and the APs 121 , 122 , 123 , and 124 .

[0117] Furthermore, the received data distribution unit 305 receives data from each of the APs 121, 122, 123, and 124. The received data distribution unit 305 outputs the received data to the communication device.

[0118] 2.4 Examples of data sent and received

[0119] An example of data transmitted and received by the parent station 110 , AP 121 , AP 122 , AP 123 , and AP 124 will be described below.

[0120] (1) When all APs are configured to send data for multicast

[0121] For example, when all AP121, AP122, AP123, and AP124 are set to multicast transmission and data is transmitted, the data transmitted is transmitted. Figure 4 Provide explanation.

[0122] Send data distribution unit 302, such as Figure 4As shown, data packets 401, 402, 403, 404, ... are received in sequence. Here, data packets 401, 402, 403, 404, ... are all multicast data packets. Data packets 401, 402, 403, 404, ... are generated from a single multicast data packet.

[0123] When all APs are configured for multicast, upon receiving packet 401, transmission data distribution unit 302 outputs the same packet 401 to APs 121, 122, 123, and 124. APs 121, 122, 123, and 124 wirelessly output packets 406, 411, 416, and 421, respectively. Packets 406, 411, 416, and 421 are generated based on the same packet 401 and correspond to each other.

[0124] Next, upon receiving data packet 402, transmission data distribution unit 302 outputs the same data packet 402 to AP 121, AP 122, AP 123, and AP 124. AP 121, AP 122, AP 123, and AP 124 wirelessly and multicast data packets 407, 412, 417, and 422, respectively. Data packets 407, 412, 417, and 422 are generated based on and correspond to the same data packet 402.

[0125] Next, upon receiving packet 403, transmission data distribution unit 302 outputs the same packet 403 to AP 121, AP 122, AP 123, and AP 124. AP 121, AP 122, AP 123, and AP 124 wirelessly and multicast packets 408, 413, 418, and 423, respectively. Packets 408, 413, 418, and 423 are generated based on and correspond to the same packet 403.

[0126] Next, upon receiving data packet 404, transmission data distribution unit 302 outputs the same data packet 404 to AP 121, AP 122, AP 123, and AP 124. AP 121, AP 122, AP 123, and AP 124 wirelessly and multicast data packets 409, 414, 419, and 424, respectively. Data packets 409, 414, 419, and 424 are generated based on and correspond to the same data packet 404.

[0127] At this time, AP121, AP122, AP123, and AP124 are characterized by each performing a phase change on the modulated signal (however, any of AP121, AP122, AP123, and AP124 may not perform a phase change). (The phase change method will be described in detail later.)

[0128] This has the advantage of expanding the cell range reached by the multicast modulated signal and reducing the number of locations where reception is difficult due to interference from the modulated signal by performing phase changes.

[0129] (2) When two APs are configured to transmit data for multicast

[0130] For example, when two APs 121 and 122 are configured as APs for multicast data transmission and the other two APs 123 and 124 are configured as APs for unicast data transmission, data is transmitted. Figure 5 In this case, it is assumed that AP121 and AP122 transmit the same data (the modulated signals after mapping before phase change are the same). Also, it is assumed that AP123 and AP124 transmit the same data (the modulated signals after mapping before phase change are the same).

[0131] Send data distribution unit 302, such as Figure 5 It is shown that data packets 501, 502, 503, 504, 505, 506, ... are received in sequence. Here, data packets 501, 503, 504, and 506, ... are multicast data packets. And data packets 502 and 505 are unicast data packets.

[0132] Here, packets 501, 503, 504, and 506 are generated from one data for multicast, and packets 502 and 505 are generated from one data for unicast.

[0133] Upon receiving data packet 501, transmission data distribution unit 302 outputs the same data packet 501 to AP 121 and AP 122. AP 121 and AP 122 respectively output data packets 511 and 521 wirelessly and as multicast transmission. Data packets 511 and 521 are generated based on the same data packet 501 and correspond to each other.

[0134] Next, upon receiving packet 502, transmission data distribution unit 302 outputs the same packet 502 to AP 123 and AP 124. AP 123 and AP 124 respectively output packets 531 and 541 via wireless unicast. Packets 531 and 541 are generated from the same packet 502 and correspond to each other.

[0135] Next, upon receiving packet 503, transmission data distribution unit 302 outputs the same packet 503 to AP 121 and AP 122. AP 121 and AP 122 respectively output packets 512 and 522 wirelessly and as multicast transmissions. Packets 512 and 513 are generated from the same packet 503 and correspond to each other.

[0136] Next, upon receiving packet 504, transmission data distribution unit 302 outputs the same packet 504 to AP 121 and AP 122. AP 121 and AP 122 respectively output packets 513 and 523 wirelessly and as multicast transmissions. Packets 513 and 523 are generated based on the same packet 504 and correspond to each other.

[0137] Next, upon receiving packet 505, transmission data dispatcher 302 outputs the same packet 505 to AP 123 and AP 124. AP 123 and AP 124 respectively output packets 532 and 542 via wireless unicast. Packets 532 and 542 are generated from the same packet 505 and correspond to each other.

[0138] Next, upon receiving packet 506, transmission data dispatcher 302 outputs the same packet 506 to AP 121 and AP 122. AP 121 and AP 122 respectively output packets 514 and 524 wirelessly and as multicast transmissions. Packets 514 and 524 are generated based on the same packet 506 and correspond to each other.

[0139] In the above description, when the modulated signal is transmitted in unicast, the packets transmitted by AP 123 and AP 124 are based on the same data. In this case, the transmission parameters of AP 123 and AP 124 are the same. AP 123 and AP 124 may also perform different phase changes. However, either AP 123 or AP 124 may not perform a phase change.

[0140] This has the advantage of expanding the cell range reached by the unicast modulated signal and reducing the number of locations where reception is difficult due to interference with the modulated signal by performing a phase change.

[0141] AP121 and AP122 are characterized by their respective phase changes for the modulated signal. However, either AP121 or AP122 may not perform a phase change. The phase change method will be described in detail later.

[0142] This has the advantage of expanding the cell range reached by the multicast modulated signal and reducing the number of locations where reception is difficult due to interference from the modulated signal by performing phase changes.

[0143] (3) When two APs are configured for multicast transmission and data is transmitted

[0144] For example, when two APs 121 and 122 are configured to transmit data in multicast mode, and the other two APs 123 and 124 are configured to transmit data in unicast mode, data is transmitted. Figure 6 In Figure 6 In the case of Figure 5 Different, AP123 and AP124 send different data.

[0145] Send data distribution unit 302, such as Figure 6 The figure shows that packets 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, ... are received in sequence. Packets 601, 603, 604, and 606 are multicast packets. Packets 602, 607, and 609 are unicast packets sent by AP 123. Packets 605, 608, and 610 are unicast packets sent by AP 124.

[0146] Here, packets 601, 603, 604, and 606 are generated from one data for multicast, packets 602, 607, and 609 are generated from one data for unicast, and packets 605, 608, and 610 are generated from other data for unicast.

[0147] Upon receiving data packet 601, transmission data distribution unit 302 outputs the same data packet 601 to AP 121 and AP 122. AP 121 and AP 122 respectively output data packets 621 and 625 wirelessly and as multicast transmission. Data packets 621 and 625 are generated based on the same data packet 601 and correspond to each other.

[0148] Next, upon receiving the data packet 602, the transmission data distribution unit 302 outputs the data packet 602 to the AP 123. The AP 123 outputs the data packet 631 by wireless unicast transmission.

[0149] Next, upon receiving packet 603, transmission data distribution unit 302 outputs the same packet 603 to AP 121 and AP 122. AP 121 and AP 122 respectively output packets 622 and 626 wirelessly and as multicast transmissions. Packets 622 and 626 are generated based on the same packet 603 and correspond to each other.

[0150] Next, upon receiving packet 604, transmission data distribution unit 302 outputs the same packet 604 to AP 121 and AP 122. AP 121 and AP 122 respectively output packets 623 and 627 wirelessly and as multicast transmissions. Packets 623 and 627 are generated based on the same packet 604 and correspond to each other.

[0151] Next, upon receiving the data packet 605, the transmission data dispatching unit 302 outputs the data packet 605 to the AP 124. The AP 124 outputs the data packet 641 by wireless unicast transmission.

[0152] Next, upon receiving packet 606, transmission data distribution unit 302 outputs the same packet 606 to AP 121 and AP 122. AP 121 and AP 122 respectively output packets 624 and 628 wirelessly and as multicast transmissions. Packets 624 and 628 are generated based on the same packet 606 and correspond to each other.

[0153] Next, upon receiving the data packet 607, the transmission data dispatching unit 302 outputs the data packet 607 to the AP 123. The AP 123 outputs the data packet 632 by wireless unicast transmission.

[0154] Next, upon receiving the data packet 608, the transmission data dispatching unit 302 outputs the data packet 608 to the AP 124. The AP 124 outputs the data packet 642 by wireless unicast transmission.

[0155] Next, upon receiving the data packet 609, the transmission data distribution unit 302 outputs the data packet 609 to the AP 123. The AP 123 outputs the data packet 633 by wireless unicast transmission.

[0156] Next, upon receiving the data packet 610, the transmission data distribution unit 302 outputs the data packet 610 to the AP 124. The AP 124 outputs the data packet 643 by wireless unicast transmission.

[0157] AP121 and AP122 are characterized by their respective phase changes for the modulated signal. However, either AP121 or AP122 may not perform a phase change. The phase change method will be described in detail later.

[0158] This has the advantage of expanding the cell range reached by the multicast modulated signal and reducing the number of locations where reception is difficult due to interference from the modulated signal by performing phase changes.

[0159] Furthermore, for AP123 and AP124, a flexible system is provided that can perform unicast communication.

[0160] For example, it is advantageous to switch according to time (for example, according to the presence of the terminal) Figure 4 The sending status, Figure 5 The sending status, Figure 6 The sending status of the message can be determined, thereby enabling a flexible system.

[0161] (4) When two APs are configured for multicast transmission and receive data

[0162] For example, when two APs 121 and 122 are configured for multicast transmission and the other two APs 123 and 124 are configured for unicast transmission for data reception, the received data is received. Figure 7 In this case, AP121 and AP122 (APs for multicast transmission) do not receive data. Also, it is assumed that AP123 and AP124 receive signals containing the same data packet.

[0163] Assume that the receiving device 217 of AP 123 sequentially receives and obtains data packets 711, 712, 713, ... . Furthermore, assume that the receiving device 217 of AP 124 sequentially receives and obtains data packets 721, 722, 723, ... . Furthermore, assume that no data packet is obtained between data packet 712 and data packet 713 received by the receiving device 217 of AP 123 . Furthermore, assume that no data packet is obtained between data packet 721 and data packet 722 received by the receiving device 217 of AP 124 .

[0164] When the receiving device 217 of the AP 123 receives the data packet 711, the receiving data distribution unit 305 receives the data packet 701. The data packet 711 corresponds to the data packet 702.

[0165] Next, when the receiving device 217 of the AP 124 receives the data packet 721, the receiving data distribution unit 305 receives the data packet 702. The data packet 721 and the data packet 702 correspond to each other.

[0166] Next, when the receiving device 217 of the AP 123 receives the data packet 712, the receiving data distribution unit 305 receives the data packet 703. The data packet 712 and the data packet 703 correspond to each other.

[0167] Next, when the receiving device 217 of the AP 124 receives the data packet 722, the receiving data distribution unit 305 receives the data packet 704. The data packet 722 corresponds to the data packet 704.

[0168] Next, when the receiving device 217 of the AP 123 receives the data packet 713, the receiving data distribution unit 305 receives the data packet 705. The data packet 713 and the data packet 705 correspond to each other.

[0169] Next, when the receiving device 217 of the AP 124 receives the data packet 723, the receiving data distribution unit 305 receives the data packet 706. The data packet 723 and the data packet 706 correspond to each other.

[0170] Moreover, AP123 and AP124 may also, for example, perform maximum ratio synthesis, and then perform demodulation and decoding to obtain data packets.

[0171] (5) When two APs are configured for multicast transmission and receive data

[0172] For example, when two APs 121 and 122 are configured for multicast transmission and the other two APs 123 and 124 are configured for unicast transmission, data is received. Figure 8 In this case, AP121 and AP122 do not receive data. Also, AP123 and AP124 receive different data.

[0173] The receiving device 217 of the AP 123 sequentially receives data packets 811, 812, 813, 814, ... in unicast. Furthermore, the receiving device 217 of the AP 124 sequentially receives data packets 816, 817, 818, 819, ... in unicast.

[0174] Here, data packets 811, 812, 813, 814, ... are generated from one unicast data, and data packets 816, 817, 818, 819, ... are generated from other unicast data.

[0175] When the receiving device 217 of the AP 123 receives the data packet 811, the receiving data distribution unit 305 receives the data packet 801. The data packet 811 corresponds to the data packet 801.

[0176] When the receiving device 217 of the AP 124 receives the data packet 816, the receiving data distribution unit 305 receives the data packet 802. The data packet 816 corresponds to the data packet 802.

[0177] When the receiving device 217 of the AP 123 receives the data packet 812, the receiving data distribution unit 305 receives the data packet 803. The data packet 812 and the data packet 803 correspond to each other.

[0178] When the receiving device 217 of the AP 123 receives the data packet 813, the receiving data distribution unit 305 receives the data packet 804. The data packet 813 and the data packet 804 correspond to each other.

[0179] When the receiving device 217 of the AP 124 receives the data packet 817, the receiving data distribution unit 305 receives the data packet 805. The data packet 817 and the data packet 805 correspond to each other.

[0180] 2.5 Mapping Method and Phase Change

[0181] Figure 9 (A) shows an example of a mapping method of the in-phase component I and the quadrature component Q constituting a QPSK modulated signal on the IQ plane.

[0182] For example, Figure 9 (A) shows that when the input data is "00", the mapping unit 206 outputs the in-phase component I=r of the baseband signal and the quadrature component Q=r of the baseband signal. Similarly, when the input data is "01", the mapping unit 206 outputs the in-phase component I=-r of the baseband signal and the quadrature component Q=r of the baseband signal. When the input data is "10", the mapping unit 206 outputs the in-phase component I=r of the baseband signal and the quadrature component Q=-r of the baseband signal. Similarly, when the input data is "11", the mapping unit 206 outputs the in-phase component I=-r of the baseband signal and the quadrature component Q=-r of the baseband signal. In this way, we obtain Figure 9 (A) shows signal points 901, 902, 903, and 904. Figure 9 (B) shows an example of the mapping method after the phase change.

[0183] Figure 9 The signal points 901, 902, 903 and 904 of (A) are rotated by θ(u) (u is the symbol number) around the origin to obtain Figure 9(B) shows signal points 911, 912, 913, and 914. The phase change value is a function of the symbol number u and is therefore represented by θ(u).

[0184] 2.6 Phase Change Unit

[0185] The AP 120 of the wireless communication system 100 may also replace Figure 2 The phase change unit 208 shown has Figure 10 Phase change unit 1002 is shown.

[0186] The phase changer 1002 receives the modulated baseband signal s(t) (1001).

[0187] The phase change unit 1002 calculates the signal z(t) after the phase change using the following equation (1).

[0188] [Number 1]

[0189] z(t)=y(t)×s(t) (t is the time) Formula (1)

[0190] The phase changer 1002 outputs the signal z(t) (1005) after the phase change.

[0191] Here, y(t) may be set as follows.

[0192]

[0193] Furthermore, the phase change unit 1002 may calculate the phase-changed signal z(f) using equation (3) instead of z(t).

[0194] [Number 3]

[0195] z(f)=y(f)×s(f) (f is frequency) ···Equation (3)

[0196] In this case, the phase changer 1002 outputs the signal z(f) after the phase change.

[0197] Furthermore, the wireless communication system 100 may maintain a plurality of phase change patterns, with one phase change pattern being assigned to each AP.

[0198] For example, wireless communication system 100 maintains four phase change patterns of period N1, period N2, period N3, and period N4. The phase change pattern of period N1 (the phase change value is represented by y1(i). Furthermore, y1(i) is set as a function of symbol number i) is assigned to AP121. The phase change pattern of period N2 (the phase change value is represented by y2(i). Furthermore, y2(i) is set as a function of symbol number i) is assigned to AP122. The phase change pattern of period N3 (the phase change value is represented by y3(i). Furthermore, y3(i) is set as a function of symbol number i) is assigned to AP123. The phase change pattern of period N4 (the phase change value is represented by y4(i). Furthermore, y4(i) is set as a function of symbol number i) is assigned to AP124.

[0199] The phase change unit 1002 of AP121 calculates the signal z(i) after phase change using the following formula (4).

[0200] [Number 4]

[0201] z(i)=y1(k)×s(i)···Formula (4)

[0202] Here, k=i mod N1, where N1 is an integer greater than or equal to 2. Also, i is, for example, an integer greater than or equal to 0. i mod N1 represents the remainder when i is divided by N1. (mod: modulo)

[0203] The phase change unit 1002 of AP122 calculates the signal z(i) after phase change using the following formula (5).

[0204] [Number 5]

[0205] z(i)=y2(k)×s(i)···Formula (5)

[0206] Here, k=i mod N2, where N2 is an integer greater than or equal to 2. Also, i is, for example, an integer greater than or equal to 0. i mod N2 represents the remainder when i is divided by N2. (mod: modulo)

[0207] The phase change unit 1002 of AP123 calculates the signal z(i) after phase change using the following formula (6).

[0208] [Number 6]

[0209] z(i)=y3(k)×s(i)···Formula (6)

[0210] Here, k=i mod N3, where N3 is an integer greater than or equal to 2. Also, i is, for example, an integer greater than or equal to 0. i mod N3 represents the remainder when i is divided by N3. (mod: modulo)

[0211] The phase change unit 1002 of AP124 calculates the signal z(i) after phase change using the following formula (7).

[0212] [Number 7]

[0213] z(i)=y4(k)×s(i)···Formula (7)

[0214] Here, k=i mod N4, where N4 is an integer greater than or equal to 2. Also, i is, for example, an integer greater than or equal to 0. i mod N4 represents the remainder when i is divided by N4. (mod: modulo)

[0215] Furthermore, it is preferable that the phase change patterns be as different as possible. In the case where the first AP and the second AP are close to each other, it may be preferable that the phase change pattern assigned to the first AP be different from the phase change pattern assigned to the second AP.

[0216] There may be a case where the pattern of phase change assigned to the first AP is the same as the pattern of phase change assigned to the second AP.

[0217] Furthermore, any one of AP121, AP122, AP123, and AP124 may also be used without performing a phase change.

[0218] 2.7 Operations in Wireless Communication System 100

[0219] Here, the operation of the wireless communication system 100 will be described.

[0220] (1) Data packet transmission

[0221] The data packet transmission work of the mother station 110, AP121, AP122, AP123 and AP124 of the wireless communication system 100 is performed by using Figures 11 to 12 The sequence diagram shown is used for explanation.

[0222] The communication device generates a data packet (step S1101) and transmits the generated data packet to the parent station 110 (step S1102). The communication device returns to step S1101 and repeats the generation and transmission of data packets.

[0223] The transmission data distribution unit 302 receives a data packet from the communication device (step S1102). It determines whether the received data packet is for multicast or unicast (step S1103). If it is for unicast ("Unicast" in step S1103), the transmission data distribution unit 302 transfers control to step S1216.

[0224] If the AP 121 is configured for multicast ("Multicast" in step S1103), the transmission data distribution unit 302 determines whether the AP 121 is configured for multicast (step S1104). If the AP 121 is configured for multicast ("Multicast" in step S1104), the transmission data distribution unit 302 outputs the received data packet to the AP 121 (step S1105). The AP 121 receives the data packet (step S1105). The AP 121 performs processing such as encoding, interleaving, mapping, and phase change (step S1106). The AP 121 then wirelessly outputs the signal (step S1107).

[0225] If AP 121 is not configured for multicast ("No" in step S1104), the transmission data distribution unit 302 determines whether AP 122 is configured for multicast (step S1108). If AP 122 is configured for multicast ("Multicast" in step S1108), the transmission data distribution unit 302 outputs the received data packet to AP 122 (step S1109). AP 122 receives the data packet (step S1109). AP 122 performs processing such as encoding, interleaving, mapping, and phase change (step S1110). Next, AP 122 wirelessly outputs the signal (step S1111).

[0226] If AP 122 is not configured for multicast ("No" in step S1108), transmission data allocation unit 302 determines whether AP 123 is configured for multicast (step S1112). If AP 123 is configured for multicast ("Multicast" in step S1112), transmission data allocation unit 302 outputs the received data packet to AP 123 (step S1113). AP 123 receives the data packet (step S1113). AP 123 performs processing such as encoding, interleaving, mapping, and phase shifting to wirelessly output the signal.

[0227] If AP 123 is not configured for multicast ("No" in step S1112), transmission data allocation unit 302 determines whether AP 124 is configured for multicast (step S1114). If AP 124 is configured for multicast ("Multicast" in step S1114), transmission data allocation unit 302 outputs the received data packet to AP 124 (step S1115). AP 124 receives the data packet (step S1115). AP 124 performs processing such as encoding, interleaving, mapping, and phase shifting to wirelessly output the signal.

[0228] When the AP 124 is not set for multicast (No in step S1114 ), the transmission data allocation unit 302 returns the control to step S1102 .

[0229] If the received data packet is for unicast ("Unicast" in step S1103), the transmission data distribution unit 302 determines whether the AP 121 is configured for unicast (step S1216). If the AP 121 is configured for unicast ("Unicast" in step S1216), the transmission data distribution unit 302 outputs the received data packet to the AP 121 (step S1217). The AP 121 receives the data packet (step S1217). The AP 121 performs processing such as encoding, interleaving, mapping, and phase change (step S1218). Next, the AP 121 wirelessly outputs the signal (step S1219).

[0230] If AP 121 is not configured for unicast ("No" in step S1216), the transmission data distribution unit 302 determines whether AP 122 is configured for unicast (step S1220). If AP 122 is configured for unicast ("Unicast" in step S1220), the transmission data distribution unit 302 outputs the received data packet to AP 122 (step S1221). AP 122 receives the data packet (step S1221). AP 122 performs processing such as encoding, interleaving, mapping, and phase change (step S1222). Next, AP 122 wirelessly outputs the signal (step S1223).

[0231] If AP 122 is not configured for unicast ("No" in step S1220), transmission data allocation unit 302 determines whether AP 123 is configured for unicast (step S1224). If AP 123 is configured for unicast ("Unicast" in step S1224), transmission data allocation unit 302 outputs the received data packet to AP 123 (step S1225). AP 123 receives the data packet (step S1225). AP 123 performs processing such as encoding, interleaving, mapping, and phase shifting to wirelessly output the signal.

[0232] If AP 123 is not configured for unicast ("No" in step S1224), the transmission data allocation unit 302 determines whether AP 124 is configured for unicast (step S1226). If AP 124 is configured for unicast ("Unicast" in step S1226), the transmission data allocation unit 302 outputs the received data packet to AP 124 (step S1227). AP 124 receives the data packet (step S1227). AP 124 performs processing such as encoding, interleaving, mapping, and phase shifting to wirelessly output the signal.

[0233] When the AP 124 is not set for unicast (No in step S1226 ), the transmission data allocation unit 302 returns the control to step S1102 .

[0234] (2) Data packet reception

[0235] The data packet reception work of the mother station 110, AP121, AP122, AP123 and AP124 of the wireless communication system 100 is performed by using Figure 13 The sequence diagram shown is used for explanation.

[0236] The receiving device 217 of the AP 121 wirelessly receives a signal (step S1351). Next, the receiving device 217 outputs a data packet to the parent station 110 (step S1352). The receiving device 217 returns control to step S1351 (step S1353), repeating wireless reception and data packet output.

[0237] The received data distribution unit 305 receives a data packet from the receiving device 217 of the AP 121 (step S1352). The received data distribution unit 305 outputs the received data packet to the communication device (step S1354).

[0238] The receiving device 217 of the AP 122 wirelessly receives the signal (step S1356). Next, the receiving device 217 outputs the data packet to the parent station 110 (step S1357). The receiving device 217 returns control to step S1356 (step S1358), and repeats the wireless reception and data packet output.

[0239] The received data sorting unit 305 receives a data packet from the receiving device 217 of the AP 122 (step S1357). The received data sorting unit 305 outputs the received data packet to the communication device (step S1359).

[0240] The receiving device 217 of the AP 123 wirelessly receives a signal (step S1361). Next, the receiving device 217 outputs a data packet to the parent station 110 (step S1362). The receiving device 217 returns control to step S1361 (step S1363), repeating wireless reception and data packet output.

[0241] The received data distribution unit 305 receives a data packet from the receiving device 217 of the AP 123 (step S1362). The received data distribution unit 305 outputs the received data packet to the communication device (step S1364).

[0242] The receiving device 217 of the AP 124 wirelessly receives the signal (step S1366). The receiving device 217 then outputs the data packet to the parent station 110 (step S1367). The receiving device 217 returns control to step S1366 (step S1368), and repeats the wireless reception and data packet output.

[0243] The received data distribution unit 305 receives a data packet from the receiving device 217 of the AP 124 (step S1367). The received data distribution unit 305 outputs the received data packet to the communication device (step S1369).

[0244] 2.8 Modification (1)

[0245] A wireless communication system 1400 as a modified example of the wireless communication system 100 will be described.

[0246] In wireless communication system 100, mother station 110 is connected to AP 121, AP 122, AP 123, and AP 124 via wired (or wireless) connections. In other words, mother station 110 is connected to AP 121, AP 122, AP 123, and AP 124 in parallel via wired (or wireless) connections. However, this configuration is not limiting.

[0247] The wireless communication system 1400 has a similar configuration to the wireless communication system 100. Here, the differences from the wireless communication system 100 will be mainly described.

[0248] Wireless communication system 1400, such as Figure 14 As shown, it is composed of a mother station 1410, AP1421, AP1422, AP1423, AP1424, and terminals 1431, 1432,..., and 1438.

[0249] In wireless communication system 1400, mother station 1410 is connected to AP 1421 via a wired (or wireless) connection. AP 1421 is connected to AP 1422 via a wired (or wireless) connection. AP 1422 is connected to AP 1423 via a wired (or wireless) connection. AP 1423 is connected to AP 1424 via a wired (or wireless) connection. In other words, mother station 1410 is connected to AP 1421, AP 1422, AP 1423, and AP 1424 in series via a wired (or wireless) connection.

[0250] (Transmission of Data Packets from the Master Station 1410 to the Terminal)

[0251] The mother station 1410 sends a data packet destined for AP 1421 , a data packet destined for AP 1422 , a data packet destined for AP 1423 , and a data packet destined for AP 1424 to AP 1421 .

[0252] AP1421 receives, from the mother station 1410 , a data packet destined for AP1421 , a data packet destined for AP1422 , a data packet destined for AP1423 , and a data packet destined for AP1424 .

[0253] If a data packet destined for AP1421 is received, AP1421 performs encoding and other processing on the data packet and then outputs it wirelessly.

[0254] If AP1421 obtains the data packet destined for AP1422, the data packet destined for AP1423, and the data packet destined for AP1424, it sends the data packet destined for AP1422, the data packet destined for AP1423, and the data packet destined for AP1424 to AP1422.

[0255] AP1422 receives, from AP1421, a data packet destined for AP1422, a data packet destined for AP1423, and a data packet destined for AP1424.

[0256] If a data packet destined for AP1422 is received, AP1422 performs encoding and other processing on the data packet and then outputs it wirelessly.

[0257] If AP1422 obtains a data packet destined for AP1423 and a data packet destined for AP1424, it sends the received data packet destined for AP1423 and the received data packet destined for AP1424 to AP1423.

[0258] AP1423 receives the data packet destined for AP1423 and the data packet destined for AP1424 from AP1422.

[0259] If a data packet destined for AP1423 is received, AP1423 performs encoding and other processing on the data packet and then outputs it wirelessly.

[0260] AP1423, if receiving a data packet destined for AP1424, sends the received data packet destined for AP1424 to AP1423.

[0261] AP1424 receives a data packet destined for AP1424 from AP1423.

[0262] If a data packet destined for AP1424 is received, AP1424 performs encoding and other processing on the data packet and then outputs it wirelessly.

[0263] (Transmission of Data Packets from the Terminal to the Mother Station 1410)

[0264] Terminal 1431, terminal 1432, ..., terminal 1438 transmit data packets wirelessly.

[0265] AP1424 receives a data packet sent by a terminal. If a data packet is received, AP1424 sends the received data packet to AP1423.

[0266] AP1423 receives a data packet sent by a terminal. Furthermore, AP1423 receives a data packet from AP1424 (the data packet AP1424 wirelessly receives from the terminal). Upon receiving the data packet from the terminal and the data packet from AP1424, AP1423 transmits the data packet from the terminal and the data packet from AP1424 to AP1422.

[0267] AP1422 receives a data packet sent by a terminal. Furthermore, AP1422 receives data packets from AP1423 (data packets wirelessly received by AP1424 from the terminal, and data packets wirelessly received by AP1423 from the terminal). Upon receiving the data packet from the terminal and the data packet from AP1423, AP1423 transmits the data packet from the terminal and the data packet from AP1423 to AP1421.

[0268] AP 1421 receives a data packet sent by a terminal. Furthermore, AP 1421 receives data packets from AP 1422 (data packets wirelessly received from the terminal by AP 1424, data packets wirelessly received from the terminal by AP 1423, and data packets wirelessly received from the terminal by AP 1422). Upon receiving the data packet from the terminal and the data packet from AP 1422, AP 1421 transmits the data packet from the terminal and the data packet from AP 1422 to the mother station 1410.

[0269] 2.9 Modification (2)

[0270] A wireless communication system 1500 as a modified example of the wireless communication system 100 will be described.

[0271] The wireless communication system 1500 has a similar structure to the wireless communication system 100. The wireless communication system 1500, such as Figure 15 The wireless communication system 100 includes a mother station 1598, AP1599-1, AP1599-2, AP1599-3, and AP1599-4 instead of the mother station 110, AP121, AP122, AP123, and AP124.

[0272] The mother station 1598 , AP 1599 - 1 , AP 1599 - 2 , AP 1599 - 3 , and AP 1599 - 4 correspond to the mother station 110 , AP 121 , AP 122 , AP 123 , and AP 124 of the wireless communication system 100 , respectively.

[0273] The master station 1598 includes an instruction unit 1504, a transmission data allocation unit 1502, a transmission signal processing unit 1507-1 for AP#1, a transmission signal processing unit 1507-2 for AP#2, a transmission signal processing unit 1507-3 for AP#3, a transmission signal processing unit 1507-4 for AP#4, and a reception data allocation unit 305 (not shown).

[0274] AP 1599-1 includes AP#1 transmission processing unit 1509-1 and antenna 1511-1. AP 1599-2 includes AP#2 transmission processing unit 1509-2 and antenna 1511-2. AP 1599-3 includes AP#3 transmission processing unit 1509-3 and antenna 1511-3. AP 1599-4 includes AP#4 transmission processing unit 1509-4 and antenna 1511-4.

[0275] AP1599-1, AP1599-2, AP1599-3, and AP1599-4 do not perform at least error correction coding, interleaving, mapping, and phase change processing.

[0276] The transmission signal processing unit 1507-1 for AP#1, the transmission signal processing unit 1507-2 for AP#2, the transmission signal processing unit 1507-3 for AP#3, and the transmission signal processing unit 1507-4 for AP#4 perform error correction coding, interleaving, mapping, and phase change processing for AP1599-1, AP1599-2, AP1599-3, and AP1599-4, respectively.

[0277] A particular feature is that AP#1 transmission signal processing unit 1507-1, AP#2 transmission signal processing unit 1507-2, AP#3 transmission signal processing unit 1507-3, and AP#4 transmission signal processing unit 1507-4 each perform phase change processing.

[0278] The AP#1 transmission processing unit 1509-1, the AP#2 transmission processing unit 1509-2, the AP#3 transmission processing unit 1509-3, and the AP#4 transmission processing unit 1509-4 each perform processing such as frequency conversion and power amplification.

[0279] Furthermore, the processing contents of the instruction unit 1504 and the processing contents of the transmission data allocation unit 1502 are respectively the same as the processing contents of the instruction unit 308 and the processing contents of the transmission data allocation unit 302 of the wireless communication system 100 .

[0280] Furthermore, an example of the processing of the transmission data distribution unit 1502 is, Figures 4 to 6 As described in the .

[0281] 2.10 Modification (3)

[0282] A wireless communication system 1600 as a modified example of the wireless communication system 100 will be described.

[0283] The wireless communication system 1600 has a similar structure to the wireless communication system 100. The wireless communication system 1600, such as Figure 16 The wireless communication system 100 includes a mother station 1698, AP 1699-1, AP 1699-2, AP 1699-3, and AP 1699-4 instead of the mother station 110, AP 121, AP 122, AP 123, and AP 124. The following description focuses on differences from the wireless communication system 100.

[0284] The main difference from the wireless communication system 100 is that the reception processing (demodulation, decoding) function is shared by the mother station 1698 and APs 1699-1, 1699-2, 1699-3, and 1699-467.

[0285] The mother station 1698 , AP 1699 - 1 , AP 1699 - 2 , AP 1699 - 3 , and AP 1699 - 4 correspond to the mother station 110 , AP 121 , AP 122 , AP 123 , and AP 124 of the wireless communication system 100 , respectively.

[0286] The master station 1698 includes an instruction unit 1610, a received data allocation unit 1607, a received signal processing unit 1605-1 for AP#1, a received signal processing unit 1605-2 for AP#2, a received signal processing unit 1605-3 for AP#3, a received signal processing unit 1605-4 for AP#4, and a transmission data allocation unit 302 (not shown).

[0287] AP 1699-1 includes an AP#1 reception processing unit 1603-1 and an antenna 1601-1. AP 1699-2 includes an AP#2 reception processing unit 1603-2 and an antenna 1601-2. AP 1699-3 includes an AP#3 reception processing unit 1603-3 and an antenna 1601-3. AP 1699-4 includes an AP#4 reception processing unit 1603-4 and an antenna 1601-4.

[0288] The AP#1 reception processing unit 1603-1, the AP#2 reception processing unit 1603-2, the AP#3 reception processing unit 1603-3, and the AP#4 reception processing unit 1603-4 each perform processing such as frequency conversion.

[0289] Furthermore, the processing contents of the instruction unit 1610 and the processing contents of the received data allocation unit 1607 are respectively the same as the processing contents of the instruction unit 308 and the processing contents of the received data allocation unit 305 of the wireless communication system 100 .

[0290] Furthermore, an example of the processing of the received data distribution unit 1607 is, Figure 7 as well as Figure 8 As described in the .

[0291] 1.11 Operations when the Master Station controls the AP

[0292] In the wireless communication system 100, the mother station 110 operates to control the new AP. Figure 17 The flowchart shown is used for explanation.

[0293] Here, it is assumed that four APs 121, 122, 123, and 124 are under the control of the master station 110, and a new AP is added. It is assumed that at this point, phase change patterns (and IDs) have already been set for the four APs 121, 122, 123, and 124.

[0294] A new AP that wishes to be controlled by the master station 110 notifies the master station 110 of its request to be controlled by the master station 110. The master station 110 accepts the request from the new AP (step S1701).

[0295] Master station 110 determines whether to place the new AP under control (step S1702). If it determines to place the new AP under control ("Yes" in step S1702), master station 110 assigns an ID to the new AP. The ID is associated with the phase change mode. The new AP sets the phase change mode based on the assigned ID (step S1703). This completes the operation for placing the new AP under control.

[0296] If it is determined that the new AP is not under control (No in step S1702), the master station 110 notifies the new AP that it is not under control (step S1704), thereby terminating the operation of controlling the new AP.

[0297] Furthermore, in step S1703, the following process may also be performed.

[0298] The mother station 110 transmits information indicating the phase change pattern set for the new AP to the new AP. The new AP receives the information indicating the phase change pattern and sets its phase change pattern based on the received information indicating the phase change pattern. At this time, the mother station 110 may or may not assign an ID to the new AP. Assigning an ID has the advantage that, when the mother station 110 specifies whether the new AP is to be used for unicast or multicast, information such as the ID and whether it is to be used for unicast or multicast can be transmitted to the AP, making it possible to easily designate the AP as having an ID and whether it is to be used for unicast or multicast.

[0299] In the above description, the case where four APs 121, 122, 123, and 124 are under the control of the master station 110 and a new AP is added is described, but the present invention is not limited to these cases.

[0300] In the initial state, there may not be any AP under the control of the master station 110. In this case, as described above, each AP is placed under the control of the master station 110.

[0301] Furthermore, in the determination of step S1702, mother station 110 may also determine whether to place a new AP under control based on the limit on the number of APs to be controlled. Mother station 110 stores the maximum number of APs to be controlled. When a request is received from a new AP to place control, the number of APs currently under control is added to "1" and the resulting value is compared with the maximum value. If the resulting value does not exceed the maximum value, or if it is equal to the maximum value, placing the AP under control is permitted. If the resulting value exceeds the maximum value, placing the AP under control is not permitted.

[0302] Furthermore, in the judgment of the aforementioned step S1702, the mother station 110 may also determine whether to put the new AP under control according to the location of the new AP and the phase change pattern.

[0303] At this time, for example, when the location of the new AP is far away from the location of the AP already under control, the master station 110 allows the new AP to be under control.

[0304] Furthermore, for example, when a new AP exists at a location close to the location of an AP already under control, if there is a phase change pattern to be assigned to the new AP, the mother station 110 allows the new AP to be under control.

[0305] Furthermore, for example, when a new AP exists at a location close to the location of an AP already under control, if there is no phase change pattern to be assigned to the new AP, the mother station 110 does not allow the new AP to be under control.

[0306] 2.11 Summary

[0307] This aspect enables high-capacity transmission at Gbps. Furthermore, when multicast is implemented, the number of terminals that can be accommodated can be increased. Furthermore, unicast communication can be performed simultaneously with multicast, making the system more flexible.

[0308] 3. Example 2

[0309] A wireless communication system 1800 according to another second embodiment of the present disclosure will be described.

[0310] 3.1 Wireless Communication System 1800

[0311] Wireless communication system 1800, such as Figure 18 As shown, the system includes a mother station 1810, APs 1820-1, 1820-2, 1820-3, and 1820-4, and terminals 1830-1, 1830-2, ..., and 1830-8.

[0312] The mother station 1810 is connected to a communication device (not shown) directly or indirectly via a communication line. Here, the communication device is, as an example, a broadcast device that broadcasts data, a distribution system that sends data, a server, etc. The communication device sends control signals and data. The control signal includes settings for unicast transmission or multicast transmission, and settings for a phase change method. Furthermore, the communication device may be composed of multiple communication devices. In this case, the first communication device may send a control signal, and the second communication device may send data. The mother station 1810 is connected to AP1820-1, AP1820-2, AP1820-3, and AP1820-4 by wire (or wireless). Furthermore, AP1820-1 is connected to AP1820-2, AP1820-3, and AP1820-4 by wire (or wireless).

[0313] Mother station 1810 receives control signals and data from a communication device. Mother station 1810 transmits control signals to AP 1820-1. Furthermore, mother station 1810 transmits data to APs 1820-1, 1820-2, 1820-3, and 1820-4. Furthermore, APs 1820-1, 1820-2, 1820-3, and 1820-4 wirelessly transmit the data received from mother station 1810.

[0314] Terminals 1830-1, 1830-2, ..., and 1830-8 are each mobile phones, smartphones, tablet computers, and personal computers (PCs) equipped with wireless communication capabilities utilizing a frequency band above 6 GHz, such as millimeter waves, for example, a frequency band of 60 GHz. For example, when terminal 1830-1 is located close to AP 1820-1, terminal 1830-1 wirelessly receives data from AP 1820-1. Similarly to terminal 1830-1, each of terminals 1830-2, ..., and 1830-8 wirelessly receives data from the nearby AP.

[0315] Then, terminal 1830 - 1 wirelessly transmits data. If terminal 1830 - 1 is located close to AP 1820 - 1 , AP 1820 - 1 wirelessly receives data from terminal 1830 - 1 . AP 1820 - 1 transmits the received data to parent station 1810 .

[0316] Terminals 1830-2, 1830-3, ..., and 1830-8 also transmit data wirelessly, similar to terminal 1830-1. An AP located near each terminal wirelessly receives data from the terminal. The AP transmits the data received from the terminal to master station 1810.

[0317] The mother station 1810 receives data sent by each terminal via the AP and outputs the received data to the communication device.

[0318] The control signal sent from master station 1810 to AP 1820-1 includes settings for unicast transmission or multicast transmission for each AP, as well as settings for each AP's phase change method. Master station 1810 does not configure settings for unicast transmission or multicast transmission for APs 1820-2, 1820-3, and 1820-4. Furthermore, master station 1810 does not configure settings for each AP's phase change method for APs 1820-2, 1820-3, and 1820-4.

[0319] AP1820-1 configures unicast transmission or multicast transmission for AP1820-2, AP1820-3, and AP1820-4. AP1820-1 also configures a phase change method for AP1820-2, AP1820-3, and AP1820-4.

[0320] AP 1820 - 1 is referred to as a master AP, and AP 1820 - 2 , AP 1820 - 3 , and AP 1820 - 4 are referred to as non-master APs.

[0321] 3.2 AP1820-1 as the Master AP

[0322] AP1820-1 as the main AP, such as Figure 19 As shown, it is composed of an encoder 202, an interleaver 204, a mapping unit 206, a phase change unit 208, a wireless unit 210, an antenna 212, an antenna 215, a receiving device 217 and an instruction unit 1902.

[0323] AP 1820-1 receives a control signal 1901 from the master station 1810. The control signal 1901 includes settings regarding unicast transmission or multicast transmission, and settings regarding a phase change method.

[0324] AP 1820-1 configures unicast transmission or multicast transmission based on control signal 1901 received from master station 1810. Furthermore, AP 1820-1 configures the phase change method based on control signal 1901. When configuring multicast transmission, AP 1820-1 is configured to use the same frequency (band) as other APs.

[0325] When the setting for unicast transmission is made, the AP 1820 - 1 activates the receiving device 217 . Alternatively, when the setting for multicast transmission is made, the AP 1820 - 1 may stop the operation of the receiving device 217 .

[0326] The AP 1820-1 uses the same channel for wireless transmission and reception in both unicast and multicast scenarios. The AP 1820-1 may also divide a single wireless carrier into multiple time slots, using each time slot as a communication channel. Furthermore, the AP 1820-1 may use multiple different frequencies in the 60 GHz band, using each frequency as a communication channel.

[0327] (1) Encoder 202

[0328] Encoder 202 receives data 201 from parent station 1810. Furthermore, encoder 202 receives control signal 213 from a controller within AP 1820-1. Control signal 213 includes information such as the encoding scheme, error correction scheme, coding rate, and block length. Encoder 202 performs error correction encoding on data 201 using the scheme specified by control signal 213, such as convolutional coding, LDPC coding, or turbo coding. Encoder 202 outputs encoded data 203.

[0329] (2) Interleaver 204

[0330] Interleaver 204 receives encoded data 203 from encoder 202. Furthermore, interleaver 204 receives control signal 213 from a controller included in AP 1820-1. Control signal 213 specifies an interleaving method. Interleaver 204 interleaves, or rearranges the order of, encoded data 203 using the interleaving method specified by control signal 213. Interleaver 204 outputs interleaved data 205.

[0331] (3) Mapping Unit 206

[0332] Mapping unit 206 receives interleaved data 205 from interleaver 204. Mapping unit 206 also receives control signal 213 from a controller included in AP 1820-1. Control signal 213 specifies a modulation scheme. Based on the modulation scheme specified in control signal 213, mapping unit 206 performs modulation on interleaved data 205 using, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation), or 64QAM (64 Quadrature Amplitude Modulation), generating a modulated signal 207. Mapping unit 206 outputs modulated signal 207. Other modulation schemes may also be used.

[0333] Furthermore, the mapping unit 206 may perform mapping including a process of changing the phase.

[0334] (4) Phase Changing Unit 208

[0335] Phase changer 208 receives modulated signal 207 from mapping unit 206. Furthermore, phase changer 208 receives control signal 1903_0. Control signal 1903_0 includes a setting for a phase change method. Phase changer 208 performs a phase change on modulated signal 207 based on the phase change method setting included in control signal 1903_0, generating phase-changed signal 209. Phase changer 208 then outputs phase-changed signal 209.

[0336] (5) Wireless Unit 210 and Antenna 212

[0337] Radio unit 210 receives phase-changed signal 209 from phase changer 208. Furthermore, radio unit 210 receives control signal 213 from a controller included in AP 1820-1. Control signal 213 includes instructions for frequency conversion, amplification, and the like. Radio unit 210 performs frequency conversion, amplification, and other processing on phase-changed signal 209 to generate transmit signal 211. Radio unit 210 outputs generated transmit signal 211 to antenna 212 using a frequency band above 6 GHz, such as millimeter waves, and, for example, a frequency band of 60 GHz.

[0338] The antenna 212 outputs the transmission signal 211 as radio waves.

[0339] (6) Antenna 215 and receiving device 217

[0340] Antenna 215 receives signal 216 output as radio waves from each terminal.

[0341] Receiver 217 receives signal 216 from antenna 215 using a frequency band above 6 GHz, such as millimeter waves, for example, 60 GHz, and performs processing such as amplification and frequency conversion to generate data 218. Receiver 217 outputs data 218 to master station 1810.

[0342] Furthermore, antenna 212 and antenna 215 may be the same antenna, but are labeled differently for ease of description.

[0343] (7) Instruction Department 1902

[0344] The instruction unit 1902 is connected to the mother station 1810 .

[0345] The instruction unit 1902 receives a control signal 1901 from the master station 1810. The control signal 1901 includes settings regarding unicast transmission or multicast transmission, and settings regarding a phase change method.

[0346] Furthermore, the setting may be performed individually for each AP based on the control signal 1901 , or may be performed for all APs based on the same control signal 1901 .

[0347] The instruction unit 1902 performs settings regarding multicast transmission or unicast transmission for all APs including the AP 1820 - 1 based on the control signal 1903_0 , the control signal 1903_1 , . . . , and the control signal 1903_N.

[0348] Here, the instruction unit 1902 may set multicast transmission for all APs, or may set unicast transmission for all APs, or may set multicast transmission for some APs and set unicast transmission for other APs.

[0349] For multiple APs configured for multicast transmission, the modulated signals before the phase change become the same signal. In other words, the same data is transmitted.

[0350] Furthermore, the instruction unit 1902 instructs each AP on a method of changing the phase based on the control signals 1903_1, ..., and 1903_N.

[0351] For multiple APs configured for unicast transmission, the modulated signals before the phase change can be the same or different. In other words, they may transmit the same data or different data.

[0352] In this manner, instruction unit 1902 generates control signals 1903_0, 1903_1, ..., and 1903_N for each AP based on received control signal 1901. Each control signal includes settings for multicast transmission or unicast transmission, as well as settings for the phase change method. Instruction unit 1902 outputs control signals 1903_0, 1903_1, ..., and 1903_N to itself, AP 1820-2, AP 1820-3, and AP 1820-4.

[0353] When unicast transmission is specified for AP 1820 - 1 , the instruction unit 1902 activates the receiving device 217 . Alternatively, when multicast transmission is specified for AP 1820 - 1 , the instruction unit 1902 may stop the operation of the receiving device 217 .

[0354] 3.3 Non-Master AP2000

[0355] AP1820-2, AP1820-3, and AP1820-4 are non-master APs. Here, AP2000 is used to represent AP1820-2, AP1820-3, and AP1820-4.

[0356] Non-master AP2000, such as Figure 20 As shown, it is composed of an encoder 202, an interleaver 204, a mapping unit 206, a phase change unit 208, a wireless unit 210, an antenna 212, an antenna 215 and a receiving device 217.

[0357] AP 2000 receives control signal 2001_0 from AP 1820-1, the master AP. Control signal 2001_0 includes settings for unicast transmission, multicast transmission, and a phase change method. Furthermore, AP 2000 receives data 2002 from AP 1820-1, the master AP. Furthermore, when AP 2000 is collaborating, it may receive data 2003 from a non-master AP. Furthermore, when AP 2000 is operating independently as a unicast transmitter, it may receive data 201 from master station 1810.

[0358] AP 2000, based on control signal 2001_0, configures unicast or multicast transmission. Furthermore, based on control signal 2001_0, AP 2000 configures the phase change method. Furthermore, when configured for multicast transmission, AP 2000 is configured to use the same frequency (band) as other APs.

[0359] When the AP 2000 is set to unicast transmission, the AP 2000 operates the receiving device 217. Alternatively, when the AP 2000 is set to multicast transmission, the AP 2000 may stop the receiving device 217.

[0360] The AP2000 uses the same channel (or frequency) for wireless transmission and reception in both unicast and multicast transmissions. The AP2000 can also divide a single wireless carrier into multiple time slots, using each time slot as a communication channel. Furthermore, the AP2000 can use multiple different frequencies in the 60 GHz band, using each frequency as a communication channel.

[0361] (1) Encoder 202

[0362] Encoder 202 receives data 2002, data 2003, or data 201. Furthermore, encoder 202 receives control signal 213 from a controller included in AP 2000. Control signal 213 includes information such as the encoding method, error correction method, coding rate, and block length. Encoder 202 performs error correction encoding on data 2002, data 2003, or data 201 using the method specified by control signal 213, such as convolutional coding, LDPC coding, or turbo coding. Encoder 202 outputs encoded data 203.

[0363] (2) Interleaver 204

[0364] Interleaver 204 receives encoded data 203 from encoder 202. Furthermore, interleaver 204 receives control signal 213 from a controller included in AP 2000. Control signal 213 specifies an interleaving method. Interleaver 204 interleaves, or rearranges, the sequence of encoded data 203 using the interleaving method specified by control signal 213. Interleaver 204 outputs interleaved data 205.

[0365] (3) Mapping Unit 206

[0366] Mapping unit 206 receives interleaved data 205 from interleaver 204. Mapping unit 206 also receives control signal 213 from a controller included in AP 2000. Control signal 213 specifies a modulation scheme. Based on the modulation scheme specified in control signal 213, mapping unit 206 performs modulation on interleaved data 205 using, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16Quadrature Amplitude Modulation), or 64QAM (64Quadrature Amplitude Modulation), generating modulated signal 207. Mapping unit 206 outputs modulated signal 207. Alternatively, the modulation scheme may be another modulation scheme.

[0367] Furthermore, the mapping unit 206 may perform mapping including a process of changing the phase.

[0368] (4) Phase Changing Unit 208

[0369] Phase changer 208 receives modulated signal 207 from mapping unit 206. Furthermore, phase changer 208 receives control signal 2001_0. Control signal 2001_0 includes a setting for a phase change method. Phase changer 208 performs a phase change on modulated signal 207 based on the phase change method setting included in control signal 2001_0, generating phase-changed signal 209. Phase changer 208 then outputs phase-changed signal 209.

[0370] (5) Wireless Unit 210 and Antenna 212

[0371] Radio unit 210 receives phase-changed signal 209 from phase changer 208. Furthermore, radio unit 210 receives control signal 213 from a controller included in AP 2000. Control signal 213 includes instructions for frequency conversion, amplification, and the like. Radio unit 210 performs frequency conversion, amplification, and other processing on phase-changed data 209 to generate transmit data 211. Radio unit 210 outputs generated transmit signal 211 to antenna 212 using a frequency band above 6 GHz, such as millimeter waves, and, for example, a frequency band of 60 GHz.

[0372] The antenna 212 outputs the transmission signal 211 as radio waves.

[0373] (6) Antenna 215 and receiving device 217

[0374] Antenna 215 receives signal 216 output as radio waves from each terminal.

[0375] Receiver 217 receives signal 216 from antenna 215 using a frequency band above 6 GHz, such as millimeter waves, for example, 60 GHz, and performs processing such as amplification and frequency conversion to generate data 218. Receiver 217 outputs data 218 to master station 1810.

[0376] Furthermore, antenna 212 and antenna 215 may be the same antenna, but are labeled differently for ease of description.

[0377] 3.4 Example of sent data

[0378] An example of data transmitted by the parent station 1810 , AP 1820 - 1 , AP 1820 - 2 , AP 1820 - 3 , and AP 1820 - 4 will be described below.

[0379] (1) When all APs are set to multicast mode

[0380] For example, when all AP1820-1, AP1820-2, AP1820-3, and AP1820-4 are set to multicast for transmission, the data to be transmitted is transmitted using Figure 21 Provide explanation.

[0381] Mother station 1810, such as Figure 21 As shown, packets 2101, 2102, 2103, 2104, ... are received sequentially. Here, packets 2101, 2102, 2103, 2104, ... are all multicast packets. Furthermore, packets 2101, 2102, 2103, 2104, ... are generated from a single multicast data packet. Parent station 1810 sequentially sends packets 2101, 2102, 2103, 2104, ... to AP 1820-1.

[0382] AP 1820-1 sequentially receives data packets 2101, 2102, 2103, 2104, .... Then, AP 1820-1 sequentially sends data packets 2101, 2102, 2103, 2104, ... to AP 1820-2, AP 1820-3, and AP 1820-4.

[0383] AP 1820-1 sequentially receives data packets 2101, 2102, 2103, 2104, .... AP 1820-1 sequentially receives data packets 2101, 2102, 2103, 2104, .... and wirelessly outputs data packets 2106, 2107, 2108, 2109, .... as multicast transmissions. Here, data packets 2101, 2102, 2103, 2104, .... correspond to data packets 2106, 2107, 2108, and 2109, respectively.

[0384] AP 1820-2, upon receiving packets 2101, 2102, 2103, 2104, ..., sequentially, wirelessly outputs packets 2111, 2112, 2113, 2114, ..., sequentially as multicast transmissions. Here, packets 2101, 2102, 2103, 2104, ..., correspond to packets 2111, 2112, 2113, 2114, ..., respectively.

[0385] AP 1820-3, upon receiving packets 2101, 2102, 2103, 2104, ..., sequentially, wirelessly outputs packets 2116, 2117, 2118, 2119, ..., sequentially as multicast transmissions. Here, packets 2101, 2102, 2103, 2104, ..., correspond to packets 2116, 2117, 2118, and 2119, respectively.

[0386] AP 1820-4, upon receiving packets 2101, 2102, 2103, 2104, ... in sequence, wirelessly outputs packets 2121, 2122, 2123, 2124, ... in sequence as multicast transmissions. Here, packets 2101, 2102, 2103, 2104, ... correspond to packets 2121, 2122, 2123, and 2124, respectively.

[0387] At this time, the characteristics of AP1820-1, AP1820-2, AP1820-3, and AP1820-4 are that they each change the phase of the modulated signal (however, any of AP1820-1, AP1820-2, AP1820-3, and AP1820-4 may not change the phase).

[0388] This has the advantage of expanding the cell range reached by the multicast modulated signal and reducing the number of locations where reception is difficult due to interference from the modulated signal by performing phase changes.

[0389] (2) When two APs are configured for multicast transmission

[0390] For example, when two APs 1820-1 and 1820-2 are configured to transmit data in multicast mode, and the other two APs 1820-3 and 1820-4 are configured to transmit data in unicast mode, data is transmitted. Figure 22 In this case, it is assumed that AP1820-1 and AP1820-2 transmit the same data (the modulated signals after mapping before phase change are the same). Furthermore, it is assumed that AP1820-3 and AP1820-4 transmit the same data (the modulated signals after mapping before phase change are the same).

[0391] Mother station 1810, such as Figure 22 As shown, packets 2201, 2202, 2203, 2204, 2205, 2206, ... are received in sequence. Here, packets 2201, 2203, 2204, and 2206 are multicast packets. Furthermore, packets 2202 and 2205 are unicast packets. Furthermore, packets 2201, 2203, 2204, and 2206 are generated from a single multicast data packet. Furthermore, packets 2202 and 2205 are generated from a single unicast data packet.

[0392] If the mother station 1810 receives data packets 2201, 2202, 2203, 2204, 2205, 2206, ... in sequence, it sends data packets 2201, 2202, 2203, 2204, 2205, 2206, ... in sequence to AP 1820-1.

[0393] Upon receiving data packets 2201, 2202, 2203, 2204, 2205, 2206, ..., AP 1820-1 outputs multicast data packets 2201, 2203, 2204, 2206, ... to its encoder 202, and sends multicast data packets 2201, 2203, 2204, 2206, ... to AP 1820-2. AP 1820-1 then sends unicast data packets 2202, 2205, ... to AP 1820-3 and AP 1820-4.

[0394] AP 1820-1, upon receiving data packets 2201, 2203, 2204, and 2206, wirelessly outputs data packets 2211, 2212, 2213, and 2214 as multicast transmission. Here, data packets 2201, 2203, 2204, and 2206 correspond to data packets 2211, 2212, 2213, and 2214, respectively.

[0395] AP 1820-2, upon receiving data packets 2201, 2203, 2204, and 2206, wirelessly outputs data packets 2221, 2222, 2223, and 2224 as multicast transmission. Here, data packets 2201, 2203, 2204, and 2206 correspond to data packets 2221, 2222, 2223, and 2224, respectively.

[0396] Upon receiving the data packets 2202 and 2205, AP 1820-3 wirelessly outputs the data packets 2231 and 2232 as unicast transmission. Here, the data packets 2202 and 2205 correspond to the data packets 2231 and 2232, respectively.

[0397] AP 1820-4, upon receiving data packets 2202 and 2205, wirelessly outputs data packets 2241 and 2242 as unicast transmission. Here, data packets 2202 and 2205 correspond to data packets 2241 and 2242, respectively.

[0398] In the above description, when the modulated signal is transmitted using unicast, the packets transmitted by AP 1820-3 and AP 1820-4 are based on the same data. In this case, AP 1820-3 and AP 1820-4 have the same transmission parameters. AP 1820-3 and AP 1820-4 may also perform different phase changes (however, either AP 1820-3 or AP 1820-4 may not perform a phase change).

[0399] This has the advantage of expanding the cell range reached by the unicast modulated signal and reducing the number of locations where reception is difficult due to interference with the modulated signal by performing a phase change.

[0400] The characteristic of AP1820-1 and AP1820-2 is that they each change the phase of the modulated signal (however, either AP1820-1 or AP1820-2 may not change the phase). (The phase change method will be described in detail later.)

[0401] This has the advantage of expanding the cell range reached by the multicast modulated signal and reducing the number of locations where reception is difficult due to interference from the modulated signal by performing phase changes.

[0402] (3) When two APs are configured for multicast transmission

[0403] For example, when two APs 1820-1 and 1820-2 are configured to transmit data in multicast mode, and the other two APs 1820-3 and 1820-4 are configured to transmit data in unicast mode, data is transmitted. Figure 23 In Figure 23 In the case of , it is assumed that AP 1820 - 3 and AP 1820 - 4 send different data.

[0404] Mother station 1810, such as Figure 23 The figure shows that packets 2301, 2302, 2303, 2304, 2305, 2306, 2307, 2308, 2309, 2310, etc. are received in sequence. Packets 2301, 2303, 2304, and 2306 are multicast packets. Packets 2302, 2307, and 2309 are unicast packets sent by AP 1820-3. Packets 2305, 2308, and 2310 are unicast packets sent by AP 1820-4.

[0405] Data packets 2301, 2303, 2304, and 2306 are generated from one data item for multicast. Data packets 2302, 2307, and 2309 are generated from one data item for unicast. Data packets 2305, 2308, and 2310 are generated from other data items for unicast.

[0406] Upon receiving data packets 2301, 2302, 2303, 2304, 2305, 2306, 2307, 2308, 2309, 2310, ... in sequence, the mother station 1810 transmits multicast data packets 2301, 2303, 2304, and 2306 to AP 1820-1 and AP 1820-2.

[0407] AP 1820-1, upon receiving data packets 2301, 2303, 2304, and 2306, wirelessly outputs data packets 2321, 2322, 2323, and 2324 as multicast transmission. Data packets 2301, 2303, 2304, and 2306 correspond to data packets 2321, 2322, 2323, and 2324, respectively.

[0408] AP 1820-2, upon receiving data packets 2301, 2303, 2304, and 2306, wirelessly outputs data packets 2325, 2326, 2327, and 2328 as multicast transmission. Data packets 2301, 2303, 2304, and 2306 correspond to data packets 2325, 2326, 2327, and 2328, respectively.

[0409] When the mother station 1810 receives data packets 2301, 2302, 2303, 2304, 2305, 2306, 2307, 2308, 2309, 2310, ... in sequence, it sends unicast data packets 2302, 2307, and 2329 to AP 1820-3.

[0410] AP 1820-3, upon receiving data packets 2302, 2307, and 2329, transmits them as unicast packets to wirelessly output data packets 2331, 2332, and 2333. Data packets 2302, 2307, and 2329 correspond to data packets 2331, 2332, and 2333, respectively.

[0411] When the mother station 1810 receives data packets 2301, 2302, 2303, 2304, 2305, 2306, 2307, 2308, 2309, 2310, ..., 1810 in sequence, it sends unicast data packets 2305, 2308, 2310 to AP 1820-4.

[0412] AP 1820-4, upon receiving data packets 2305, 2308, and 2310, transmits them as unicast packets to wirelessly output data packets 2341, 2342, and 2343. Data packets 2305, 2308, and 2310 correspond to data packets 2341, 2342, and 2343, respectively.

[0413] The characteristics of AP1820-1 and AP1820-2 are that they each change the phase of the modulated signal (however, neither AP1820-1 nor AP1820-2 changes the phase).

[0414] This has the advantage of expanding the cell range reached by the multicast modulated signal and reducing the number of locations where reception is difficult due to interference from the modulated signal by performing phase changes.

[0415] Furthermore, for AP1820-3 and AP1820-4, a flexible system is provided that can perform unicast communication.

[0416] For example, there is the advantage that switching according to time (for example, switching according to the presence of the terminal) is Figure 21 The sending status, Figure 22 The sending status, Figure 23 The sending status of the message can be determined, thereby enabling a flexible system.

[0417] 3.5 What the Master AP does when it controls a new AP

[0418] In the wireless communication system 1800, the operation when the AP 1820-1 as the master AP takes control of the new AP is performed using Figure 24 The flowchart shown is used for explanation.

[0419] Here, let's assume that three APs (APs 1820-2, 1820-3, and 1820-4) are under the control of AP 1820-1, the master AP. Then, a new AP is added. At this point, it's assumed that the phase change pattern (and the AP IDs) have already been set for the four APs (APs 1820-1, 1820-2, 1820-3, and 1820-4).

[0420] A new AP that wishes to be controlled by AP 1820-1 notifies AP 1820-1 of its request to be controlled. AP 1820-1, the new AP, accepts the request (step S2401).

[0421] AP 1820-1 determines whether to place a new AP under control (step S2402). If it determines that a new AP is to be placed under control ("Yes" in step S2402), AP 1820-1 assigns an ID to the new AP. This ID is associated with the phase change mode. The new AP sets the phase change mode based on the assigned ID (step S2403). This completes the operation for placing the new AP under control.

[0422] If it is determined that the new AP is not under control (No in step S2402), the AP 1820-1 notifies the new AP that it is not under control (step S2404), thereby terminating the operation for controlling the new AP.

[0423] Furthermore, in step S2403, the processing may be performed as follows.

[0424] AP1820-1, serving as the master AP, transmits information indicating the phase change mode set for the new AP to the new AP. The new AP receives the information indicating the phase change mode and sets its phase change mode based on the received information indicating the phase change mode. At this time, AP1820-1, serving as the master AP, may or may not assign an ID to the new AP. Assigning an ID here has the advantage that, when AP1820-1, serving as the master AP, specifies an AP for unicast transmission or an AP for multicast transmission for the new AP under its control, information such as "ID and unicast or multicast" is transmitted to the AP, thereby enabling the AP to be easily designated as having an ID and for unicast or multicast transmission.

[0425] In the above description, the three APs 1820-2, 1820-3, and 1820-4 are controlled by the master AP 1820-1, and then a new AP is added. However, the present invention is not limited to this case.

[0426] In the initial state, there may be no AP under the control of the master AP 1820-1. In this case, as described above, each AP may be controlled by the master AP 1820-1.

[0427] Furthermore, in step S2402, AP 1820-1, acting as the master AP, may determine whether to place a new AP under control based on the limit on the number of APs to be controlled. AP 1820-1 stores the maximum number of APs to be controlled. When a new AP requests control, it adds "1" to the number of APs currently under control and compares the resulting value with the maximum value. If the resulting value does not exceed the maximum value, or if it equals the maximum value, control is permitted. If the resulting value exceeds the maximum value, control is not permitted.

[0428] Furthermore, in the judgment of the above-mentioned step S2402, AP1820-1 may also judge whether to put the new AP under control according to the location of the new AP and the phase change pattern.

[0429] At this time, for example, if the location of the new AP is far away from the location of the AP that is already under its control, AP 1820 - 1 allows the new AP to be controlled.

[0430] Furthermore, for example, when a new AP is located close to the location of an AP that is already under its control, if there is a phase change pattern to be assigned to the new AP, AP1820-1 allows the new AP to be controlled.

[0431] Furthermore, for example, when a new AP is located close to an AP that is already under its control, if there is no phase change pattern to be assigned to the new AP, AP 1820-1 does not allow the new AP to be controlled.

[0432] 3.6 Summary

[0433] This aspect enables high-capacity transmission at the Gbps level. Furthermore, when multicast is implemented, the number of terminals that can be accommodated can be increased. Furthermore, unicast communication can be performed simultaneously with multicast, making the system more flexible.

[0434] 4. Example 3

[0435] A wireless communication system 2500 according to another third embodiment of the present disclosure will be described.

[0436] 4.1 Wireless Communication System 2500

[0437] Wireless communication system 2500, such as Figure 25 As shown, the system includes a mother station 2510, AP2520-1, AP2520-2, AP2520-3, AP2520-4, and terminals 2530-1, 2530-2, ..., and 2530-8.

[0438] The mother station 2510 is connected to a communication device (not shown) directly or indirectly via a communication line. Here, the communication device is a broadcasting device that broadcasts data, a distribution system that sends data, a server, etc. The communication device sends control signals and data. The control signal includes settings for a unicast transmission method or a multicast transmission method, as well as settings for a weighted method. Furthermore, the communication device may be composed of a plurality of communication devices. In this case, the first communication device may send a control signal, and the second communication device may send data. In addition, the mother station 2510 is connected to AP2520-1, AP2520-2, AP2520-3, and AP2520-4 (which may also be connected wirelessly) by wire (or wirelessly).

[0439] Mother station 2510 receives control signals and data from the communication device. Mother station 2510 transmits control signals and data to APs 2520-1, 2520-2, 2520-3, and 2520-4, respectively. APs 2520-1, 2520-2, 2520-3, and 2520-4 wirelessly transmit the data received from mother station 2510.

[0440] Terminal 2530-1, terminal 2530-2, ..., and terminal 2530-8 are mobile phones, smartphones, tablet computers, and personal computers (PCs) respectively, which have wireless communication functions using a frequency band of 6 GHz or higher, such as a so-called millimeter wave, for example, a frequency band of 60 GHz.

[0441] For example, when the terminal 2530-1 is located close to the AP 2520-1, the terminal 2530-1 wirelessly receives data from the AP 2520-1. Similarly to the terminal 2530-1, each of the terminals 2530-2, ..., and 2530-8 also wirelessly receives data from the nearby AP.

[0442] Then, the terminal 2530 - 1 wirelessly transmits data. If the terminal 2530 - 1 is located close to the AP 2520 - 1 , the AP 2520 - 1 wirelessly receives data from the terminal 2530 - 1 . The AP 2520 - 1 transmits the received data to the master station 2510 .

[0443] Terminals 2530-2, 2530-3, ..., and 2530-8 also transmit data wirelessly, similar to terminal 2530-1. An AP located near each terminal wirelessly receives data from the terminal. The AP transmits the data received from the terminal to the master station 2510.

[0444] The mother station 2510 receives data from each terminal via each AP and outputs the received data to the communication device.

[0445] The control signal transmitted from the master station 2510 to AP 2520 - 1 , AP 2520 - 2 , AP 2520 - 3 , and AP 2520 - 4 includes settings regarding unicast transmission or multicast transmission of each AP, and settings regarding a weighting method of each AP.

[0446] 4.2AP2520

[0447] AP2520-1, AP2520-2, AP2520-3, and AP2520-4 have, for example, the same structure (same function). Here, AP2520 is described to represent AP2520-1, AP2520-2, AP2520-3, and AP2520-4.

[0448] AP2520, such as Figure 26 As shown, the system is composed of an encoder 202, an interleaver 204, a mapping unit 206, a weighting unit 2601, a wireless unit 210, an antenna 212, an antenna 215, and a receiving device 217.

[0449] AP 2520 receives control signal 214 from parent station 2510. Control signal 214 includes settings regarding a unicast transmission method or a multicast transmission method, and settings regarding a weighting method.

[0450] AP 2520 configures a unicast transmission method or a multicast transmission method based on control signal 214 received from master station 2510. Furthermore, AP 2520 configures a weighting method based on control signal 214. When multicast transmission is configured, AP 2520 is configured to use the same frequency (band) as other APs.

[0451] When unicast transmission is set, the AP 2520 operates the receiving device 217. Alternatively, when multicast transmission is set, the AP 2520 may stop the receiving device 217.

[0452] The AP 2520 uses the same channel (or frequency) for wireless transmission and reception in both unicast and multicast transmissions. The AP 2520 may also divide a single wireless carrier into multiple time slots, using each time slot as a communication channel. Furthermore, the AP 2520 may use multiple different frequencies in the 60 GHz band, using each frequency as a communication channel.

[0453] (1) Encoder 202

[0454] Encoder 202 receives data 201 from parent station 2510. Furthermore, encoder 202 receives control signal 213 from a controller within AP 2520. Control signal 213 includes information such as the encoding scheme, error correction scheme, coding rate, and block length. Encoder 202 performs error correction encoding on data 201 using the scheme specified by control signal 213, such as convolutional coding, LDPC coding, or turbo coding. Encoder 202 outputs encoded data 203.

[0455] (2) Interleaver 204

[0456] Interleaver 204 receives encoded data 203 from encoder 202. Furthermore, interleaver 204 receives control signal 213 from a controller included in AP 2520. Control signal 213 specifies an interleaving method. Interleaver 204 interleaves, or rearranges the order of, encoded data 203 using the interleaving method specified by control signal 213. Interleaver 204 outputs interleaved data 205.

[0457] (3) Mapping Unit 206

[0458] Mapping unit 206 receives interleaved data 205 from interleaver 204. Mapping unit 206 also receives control signal 213 from a controller included in AP 2520. Control signal 213 specifies a modulation scheme. Based on the modulation scheme specified in control signal 213, mapping unit 206 performs modulation on interleaved data 205 using, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation), or 64QAM (64 Quadrature Amplitude Modulation), generating modulated signal 207. Mapping unit 206 outputs modulated signal 207. Other modulation schemes may also be used.

[0459] Furthermore, the mapping unit 206 may perform mapping including weighting processing.

[0460] (4) Weighting Unit 2601

[0461] Weighting unit 2601 receives modulated signal 207 from mapping unit 206. Furthermore, weighting unit 2601 receives control signal 214. Control signal 214 includes a weighting method setting. Weighting unit 2601 weights modulated signal 207 according to the weighting method setting included in control signal 214, generating weighted signal 2602. Weighting unit 2601 outputs weighted signal 2602.

[0462] (5) Wireless Unit 210 and Antenna 212

[0463] Wireless unit 210 receives weighted data 2602 from weighting unit 2601. Furthermore, wireless unit 210 receives control signal 213 from a controller included in AP 2520. Control signal 213 includes instructions for frequency conversion, amplification, and the like. Wireless unit 210 performs frequency conversion, amplification, and other processing on weighted signal 2602 to generate transmit data 211. Wireless unit 210 outputs generated transmit signal 211 to antenna 212 using a frequency band above 6 GHz, such as millimeter waves, and, for example, a frequency band of 60 GHz.

[0464] The antenna 212 outputs the transmission signal 211 as radio waves.

[0465] (6) Antenna 215 and receiving device 217

[0466] Antenna 215 receives signal 216 output as radio waves from each terminal.

[0467] Receiver 217 receives signal 216 from antenna 215 using a frequency band above 6 GHz, such as millimeter waves, for example, 60 GHz, and performs processing such as amplification and frequency conversion to generate data 218. Receiver 217 outputs data 218 to master station 2510.

[0468] Furthermore, antenna 212 and antenna 215 may be the same antenna, but are labeled differently for ease of description.

[0469] 4.3 Mother Station 2510

[0470] Mother station 2510, such as Figure 27 As shown, it is composed of a transmission data distribution unit 302, a reception data distribution unit 305 and an instruction unit 308.

[0471] (1) Instruction unit 308

[0472] The instruction unit 308 is connected to the communication device, and AP 2520 - 1 , AP 2520 - 2 , AP 2520 - 3 , and AP 2520 - 4 .

[0473] Instruction unit 308 receives control signal 307. Control signal 307 includes settings for unicast transmission, multicast transmission, and weighting method. The communication device includes a PC as an example, and the user of the PC inputs the control signal through the PC.

[0474] Furthermore, the control signal 307 may be set individually for each AP, or the same control signal 307 may be set for all APs.

[0475] You can set all APs to multicast, or you can set all APs to unicast. You can also set some APs to multicast, and others to unicast. In this way, you can mix multicast and unicast settings for each AP.

[0476] For multiple APs configured for multicast, the modulated signals before weighting become the same signal. In other words, the same data is transmitted.

[0477] Furthermore, the instruction unit 308 instructs each AP on a weighting method.

[0478] For multiple APs configured for unicast, the modulated signals before weighting can be the same or different. In other words, they may send the same data or different data.

[0479] The instruction unit 308 outputs the received control signal 307 to the transmission data allocation unit 302 , the reception data allocation unit 305 , and AP2520 - 1 , AP2520 - 2 , AP2520 - 3 , and AP2520 - 4 .

[0480] (2) Transmission Data Distribution Unit 302

[0481] The transmission data distribution unit 302 is connected to the communication device, the instruction unit 308 , and AP 2520 - 1 , AP 2520 - 2 , AP 2520 - 3 , and AP 2520 - 4 .

[0482] The transmission data allocation unit 302 receives the control signal 310 from the instruction unit 308. The transmission data allocation unit 302 outputs the received control signal 310 to AP 2520-1, AP 2520-2, AP 2520-3, and AP 2520-4.

[0483] Furthermore, the transmission data distribution unit 302 receives data 301 from the communication device. The transmission data distribution unit 302 distributes the received data into AP 2520-1, AP 2520-2, AP 2520-3, and AP 2520-4. The transmission data distribution unit 302 outputs the distributed data to AP 2520-1, AP 2520-2, AP 2520-3, and AP 2520-4, respectively.

[0484] (3) Received Data Distribution Unit 305

[0485] The received data distribution unit 305 is connected to the communication device, the instruction unit 308 , and AP 2520 - 1 , AP 2520 - 2 , AP 2520 - 3 , and AP 2520 - 4 .

[0486] The received data distribution unit 305 receives data 304-1, 304-2, 304-3, and 304-4 from AP 2520-1, AP 2520-2, AP 2520-3, and AP 2520-4, respectively. The received data distribution unit 305 outputs the received data 304-1, 304-2, 304-3, and 304-4 to the communication device.

[0487] 4.4 Example of sent data

[0488] An example of data transmitted by the mother station 2510 , AP 2520 - 1 , AP 2520 - 2 , AP 2520 - 3 , and AP 2520 - 4 will be described below.

[0489] (1) When all APs are configured to send data for multicast

[0490] For example, when all AP2520-1, AP2520-2, AP2520-3, and AP2520-4 are set to multicast transmission, data is transmitted. Figure 28 as well as Figure 29 Provide explanation.

[0491] Send data distribution unit 302, such as Figure 28 14, ... are received in sequence. Here, packets 2811, 2812, 2813, 2814, ... are all multicast packets. Furthermore, packets 2811, 2812, 2813, 2814, ... are generated from a single multicast data packet.

[0492] The transmission data distribution unit 302 outputs the data packets 2811 , 2812 , 2813 , 2814 , etc. to AP 2520 - 1 , AP 2520 - 2 , AP 2520 - 3 , and AP 2520 - 4 , respectively, in sequence.

[0493] (a) Processing 1 of each AP

[0494] like Figure 25 、 Figure 28 As shown, in AP2520-1, A1(0), A1(1), A1(2), A1(3), ... are prepared as weights. Similarly, in AP2520-2, A2(0), A2(1), A2(2), A2(3), ... are prepared as weights. In AP2520-3, A3(0), A3(1), A3(2), A3(3), ... are prepared as weights. In AP2520-4, A4(0), A4(1), A4(2), A4(3), ... are prepared as weights.

[0495] (b) Processing 2 of each AP

[0496] Next, for the processing of each AP, use Figure 29 Provide explanation.

[0497] (Processing of AP2520-1)

[0498] The mapping unit 206 of AP2520-1 is as follows: Figure 29It is shown that mapped baseband signal complex numbers (which may also be real numbers) 2911 "c(0)", 2912 "c(1)", 2913 "c(2)", 2914 "c(3)", etc. are generated. Moreover, c(0) is set to the mapped baseband signal related to data packet 2811. Moreover, c(1) is set to the mapped baseband signal related to data packet 2812, c(2) is set to the mapped baseband signal related to data packet 2813, c(3) is set to the mapped baseband signal related to data packet 2814, etc.

[0499] If the mapped baseband signal complex number 2911 "c(0)" is generated, the weighting unit 2601 of AP2520-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(0)×A1(0)(2931), c(0)×A1(1)(2932), c(0)×A1(2)(2933), and c(0)×A1(3)(2934).

[0500] AP2520-1 wirelessly outputs c(0)×A1(0)(2931), c(0)×A1(1)(2932), c(0)×A1(2)(2933), and c(0)×A1(3)(2934).

[0501] If the mapped baseband signal complex number 2912 "c(1)" is generated, the weighting unit 2601 of AP2520-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(1)×A1(0)(2935), c(1)×A1(1)(2936), c(1)×A1(2)(2937), and c(1)×A1(3)(2938).

[0502] AP2520-1 wirelessly outputs c(1)×A1(0)(2935), c(1)×A1(1)(2936), c(1)×A1(2)(2937), and c(1)×A1(3)(2938).

[0503] When generating the mapped complex baseband signals 2913 “c(2)”, 2914 “c(3)”, etc., AP 2520 - 1 also performs the same operation as described above.

[0504] (AP2520-2 processing)

[0505] The mapping unit 206 of AP2520-2 is as follows: Figure 29It is shown that mapped baseband signal complex numbers 2911 "c(0)", 2912 "c(1)", 2913 "c(2)", 2914 "c(3)", etc. are generated. Moreover, c(0) is set to the mapped baseband signal related to data packet 2811. Moreover, c(1) is set to the mapped baseband signal related to data packet 2812, c(2) is set to the mapped baseband signal related to data packet 2813, c(3) is set to the mapped baseband signal related to data packet 2814, etc.

[0506] If the mapped baseband signal complex number 2911 "c(0)" is generated, the weighting unit 2601 of AP2520-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(0)×A2(0)(2941), c(0)×A2(1)(2942), c(0)×A2(2)(2943), and c(0)×A2(3)(2944).

[0507] AP2520-2 wirelessly outputs c(0)×A2(0)(2941), c(0)×A2(1)(2942), c(0)×A2(2)(2943), and c(0)×A2(3)(2944).

[0508] If the mapped baseband signal complex number 2912 "c(1)" is generated, the weighting unit 2601 of AP2520-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(1)×A2(0)(2945), c(1)×A2(1)(2946), c(1)×A2(2)(2947), and c(1)×A2(3)(2948).

[0509] AP2520-2 wirelessly outputs c(1)×A2(0)(2945), c(1)×A2(1)(2946), c(1)×A2(2)(2947), and c(1)×A2(3)(2948).

[0510] When generating the mapped complex baseband signals 2913 “c(2)”, 2914 “c(3)”, etc., AP 2520-2 also performs the same operation as described above.

[0511] (Processing of AP2520-3 and AP2520-4)

[0512] AP2520-3 and AP2520-4 also perform the same operations as described above.

[0513] Furthermore, the weighting unit 2601 of the AP 2520 - 3 performs weighting using the complex number A3 ( 0 ), the complex number A3 ( 1 ), the complex number A3 ( 2 ), and the complex number A3 ( 3 ).

[0514] Furthermore, the weighting unit 2601 of the AP 2520 - 4 performs weighting using the complex number A4 ( 0 ), the complex number A4 ( 1 ), the complex number A4 ( 2 ), and the complex number A4 ( 3 ).

[0515] As described above, it has the characteristics of weighting each data packet differently and sending it multiple times, and it also has the characteristics of sending each data packet multiple times from multiple APs.

[0516] Using multiple APs for transmission has the effect of expanding the cell area, and each data packet is sent multiple times with different weights, thereby sending the data packet multiple times with different directionality. Therefore, it has the effect of maintaining more uniform reception quality within the cell area.

[0517] The weighting coefficients A1(i), A2(i), A3(i), and A4(i) are considered to have the following properties, for example.

[0518] Suppose that the modulated signal of packet A is transmitted N times (N is an integer greater than or equal to 2). In this case, let the weighting coefficient for the modulated signal used to transmit packet A the uth time be A1(u). Let the weighting coefficient for the modulated signal used to transmit packet A the vth time be A1(v). Furthermore, let u and v be integers greater than or equal to 1 and less than or equal to N, such that u ≠ v holds. In this case, u and v are integers greater than or equal to 1 and less than or equal to N, and u ≠ v holds. For all u and all v that satisfy this, A1(u) ≠ A1(v).

[0519] Similarly, assume that the modulated signal of packet A is transmitted N times (N is an integer greater than or equal to 2). In this case, let the weighting coefficient of the modulated signal used to transmit packet A the uth time be Ak(u). Let the weighting coefficient of the modulated signal used to transmit packet A the vth time be Ak(v). Furthermore, assume that u and v are integers greater than or equal to 1 and less than or equal to N, and u ≠ v holds. In this case, u and v are integers greater than or equal to 1 and less than or equal to N, and u ≠ v holds. For all u and all v that satisfy this, Ak(u) ≠ Ak(v) (k is an integer greater than or equal to 1).

[0520] Furthermore, the weighting coefficient Ak(i) may have a period. If the period is M (M is an integer greater than or equal to 2), the following equation (8) holds.

[0521] [Number 8]

[0522] Ak(i)=Ak(i mod M)···Formula (8)

[0523] Set i mod M to the remainder when i is divided by M.

[0524] (2) When AP2520-1 and AP2520-2 are configured for multicast transmission, and AP2520-3 and AP2520-4 are configured for unicast transmission, data is transmitted.

[0525] For example, when AP2520-1 and AP2520-2 are configured for multicast transmission and AP2520-3 and AP2520-4 are configured for unicast transmission, data is transmitted. Figure 30 as well as Figure 31 In this case, AP2520-1 and AP2520-2 transmit the same data (the modulated signals after mapping are the same before phase change). Furthermore, it is assumed that AP2520-3 and AP2520-4 transmit the same data (the modulated signals after mapping are the same).

[0526] Send data distribution unit 302, such as Figure 30 As shown, data packets 3011, 3012, 3013, 3014, ... are received in sequence. Here, data packets 3011, 3013, 3014, 3016, ... are multicast data packets. Data packets 3011, 3013, 3014, 3016, ... are generated from a single multicast data packet. Furthermore, data packets 3012, 3015, ... are unicast data packets. Data packets 3012, 3015, ... are generated from a single unicast data packet.

[0527] The transmission data distribution unit 302 sequentially outputs multicast packets 3011, 3013, 3014, 3016, ... to AP 2520-1 and AP 2520-2, respectively. Furthermore, the transmission data distribution unit 302 sequentially outputs unicast packets 3012, 3015, ... to AP 2520-3 and AP 2520-4, respectively.

[0528] (a) Processing of each AP 1

[0529] like Figure 25 、 Figure 30 As shown, in AP2520-1, A1(0), A1(1), A1(2), A1(3), ... are prepared as weights. Similarly, in AP2520-2, A2(0), A2(1), A2(2), A2(3), ... are prepared as weights.

[0530] (b) Processing 2 of each AP

[0531] Next, for another example of processing of each AP, use Figure 31 Provide explanation.

[0532] (Processing of AP2520-1)

[0533] The mapping unit 206 of AP2520-1 is as follows: Figure 31 It is shown that mapped baseband signal complex numbers 3111 "c(0)", 3112 "c(1)", 3113 "c(2)", 3114 "c(3)", etc. are generated. Moreover, c(0) is set to the mapped baseband signal related to data packet 3011. Moreover, c(1) is set to the mapped baseband signal related to data packet 3013, c(2) is set to the mapped baseband signal related to data packet 3014, c(3) is set to the mapped baseband signal related to data packet 3016, etc.

[0534] If the mapped baseband signal complex number 3111 "c(0)" is generated, the weighting unit 2601 of AP2520-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(0)×A1(0)(3131), c(0)×A1(1)(3132), c(0)×A1(2)(3133), and c(0)×A1(3)(3134).

[0535] AP2520-1 wirelessly outputs c(0)×A1(0)(3131), c(0)×A1(1)(3132), c(0)×A1(2)(3133), and c(0)×A1(3)(3134).

[0536] If the mapped baseband signal complex number 3112 "c(1)" is generated, the weighting unit 2601 of AP2520-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(1)×A1(0)(3135), c(1)×A1(1)(3136), c(1)×A1(2)(3137), and c(1)×A1(3)(3138).

[0537] AP2520-1 wirelessly outputs c(1)×A1(0)(3135), c(1)×A1(1)(3136), c(1)×A1(2)(3137), and c(1)×A1(3)(3138).

[0538] Even when generating the mapped complex baseband signals 3113 “c(2)”, 3114 “c(3)”, etc., AP 2520-1 performs the same operation as described above.

[0539] (AP2520-2 processing)

[0540] The mapping unit 206 of AP2520-2 is as follows: Figure 31 It is shown that the mapped baseband signal complex numbers 3111 "c(0)", 3112 "c(1)", 3113 "c(2)", 3114 "c(3)", etc. are generated.

[0541] Furthermore, let c(0) be the mapped baseband signal associated with the data packet 3011. Let c(1) be the mapped baseband signal associated with the data packet 3013, let c(2) be the mapped baseband signal associated with the data packet 3014, let c(3) be the mapped baseband signal associated with the data packet 3016, and so on.

[0542] If the mapped baseband signal complex number 3111 "c(0)" is generated, the weighting unit 2601 of AP2520-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(0)×A2(0)(3141), c(0)×A2(1)(3142), c(0)×A2(2)(3143), and c(0)×A2(3)(3144).

[0543] AP2520-2 wirelessly outputs c(0)×A2(0)(3141), c(0)×A2(1)(3142), c(0)×A2(2)(3143), and c(0)×A2(3)(3144).

[0544] If the mapped baseband signal complex number 3112 "c(1)" is generated, the weighting unit 2601 of AP2520-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(1)×A2(0)(3145), c(1)×A2(1)(3146), c(1)×A2(2)(3147), and c(1)×A2(3)(3148).

[0545] AP2520-2 wirelessly outputs c(1)×A2(0)(3145), c(1)×A2(1)(3146), c(1)×A2(2)(3147), and c(1)×A2(3)(3148).

[0546] When generating the mapped complex baseband signals 3113 “c(2)”, 3114 “c(3)”, etc., AP 2520-2 also performs the same operation as described above.

[0547] (Processing of AP2520-3)

[0548] The mapping unit 206 of the AP 2520 - 3 generates mapped complex baseband signals “d(0)”, “d(1)”, “d(2)”, etc.

[0549] Furthermore, let d(0) be the mapped baseband signal associated with the data packet 3051. Let d(1) be the mapped baseband signal associated with the data packet 3052, let d(2) be the mapped baseband signal associated with the data packet 3053, and so on.

[0550] If the mapped baseband signal complex number "d(0)" is generated, such as Figure 31 As shown, AP2520-3 wirelessly outputs the mapped baseband signal complex number "d(0)" (3151).

[0551] If the mapped baseband signal complex number "d(1)" is generated, such as Figure 31 As shown, AP2520-3 wirelessly outputs the mapped baseband signal complex number "d(1)" (3152).

[0552] Below, similarly, AP2520-3, such as Figure 31 It shows that the mapped baseband signal complex numbers "d(2)", "d(3)", "d(4)", ..., "d(7)", ... are generated, and "d(2)", "d(3)", "d(4)", ..., "d(7)", ... are generated by wireless output.

[0553] (Processing of AP2520-4)

[0554] The mapping unit 206 of the AP 2520 - 4 generates mapped complex baseband signals “d(0)”, “d(1)”, “d(2)”, etc.

[0555] Furthermore, let d(0) be the mapped baseband signal associated with data packet 3061. Let d(1) be the mapped baseband signal associated with data packet 3062, let d(2) be the mapped baseband signal associated with data packet 3063, and so on.

[0556] If the mapped baseband signal complex number "d(0)" is generated, such as Figure 31 As shown, AP2520-4 wirelessly outputs the mapped baseband signal complex number "d(0)" (3161).

[0557] If the mapped baseband signal complex number "d(1)" is generated, such as Figure 31 As shown, AP2520-4 wirelessly outputs the mapped baseband signal complex number "d(1)" (3162).

[0558] Below, similarly, AP2520-4, such as Figure 31 It shows that the mapped baseband signal complex numbers "d(2)", "d(3)", "d(4)", ..., "d(7)", ... are generated, and "d(2)", "d(3)", "d(4)", ..., "d(7)", ... are generated by wireless output.

[0559] As described above, each data packet for multicast is weighted differently and transmitted multiple times, and each data packet for multicast is transmitted multiple times from multiple APs.

[0560] By using multiple APs for transmission, the cell area can be expanded, and each data packet for multicast is sent multiple times with different weights, thereby sending the data packet multiple times with different directionality. Therefore, it has the effect of maintaining more uniform reception quality within the cell area.

[0561] Furthermore, AP2520-3 and AP2520-4 may also change the phase or weighting in terms of time and frequency, thereby achieving an effect of improving the reception quality of unicast data packets.

[0562] (3) When AP2520-1 and AP2520-2 are set for multicast, and AP2520-3 and AP2520-4 are set for unicast transmission

[0563] For example, when AP2520-1 and AP2520-2 are configured for multicast transmission and AP2520-3 and AP2520-4 are configured for unicast transmission, data is transmitted. Figure 32 as well as Figure 33 In this case, AP 2520 - 3 and AP 2520 - 4 transmit different data.

[0564] Send data distribution unit 302, such as Figure 32 As shown, data packets 3211, 3212, 3213, 3214, ... are received in sequence. Here, data packets 3211, 3213, 3214, 3216, ... are multicast data packets. Data packets 3211, 3213, 3214, 3216, ... are generated from a single multicast data packet. Furthermore, data packets 3212, ... are first unicast data packets. Data packets 3212, ... are generated from first unicast data packets. Furthermore, data packets 3215, ... are second unicast data packets. Data packets 3215, ... are generated from second unicast data packets.

[0565] The transmission data distribution unit 302 sequentially outputs multicast packets 3211, 3213, 3214, 3216, ... to AP 2520-1 and AP 2520-2, respectively. Furthermore, the transmission data distribution unit 302 sequentially outputs unicast packets 3212, ... to AP 2520-3. Furthermore, the transmission data distribution unit 302 sequentially outputs unicast packets 3215, ... to AP 2520-4.

[0566] (a) Processing 1 of each AP

[0567] like Figure 25 、 Figure 32 As shown, in AP2520-1, A1(0), A1(1), A1(2), A1(3), ... are prepared as weights. Similarly, in AP2520-2, A2(0), A2(1), A2(2), A2(3), ... are prepared as weights.

[0568] (b) Processing 2 of each AP

[0569] Next, for another example of processing of each AP, use Figure 33 Provide explanation.

[0570] (Processing of AP2520-1)

[0571] The mapping unit 206 of AP2520-1 is as follows: Figure 33 It is shown that the mapped baseband signal complex numbers 3311 "c(0)", 3312 "c(1)", 3313 "c(2)", 3314 "c(3)", etc. are generated.

[0572] Furthermore, let c(0) be the mapped baseband signal associated with data packet 3211. Let c(1) be the mapped baseband signal associated with data packet 3213, let c(2) be the mapped baseband signal associated with data packet 3214, let c(3) be the mapped baseband signal associated with data packet 3216, and so on.

[0573] If the mapped baseband signal complex number 3311 "c(0)" is generated, the weighting unit 2601 of AP2520-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(0)×A1(0)(3331), c(0)×A1(1)(3332), c(0)×A1(2)(3333), and c(0)×A1(3)(3334).

[0574] AP2520-1 wirelessly outputs c(0)×A1(0)(3331), c(0)×A1(1)(3332), c(0)×A1(2)(3333), and c(0)×A1(3)(3334).

[0575] If the mapped baseband signal complex number 3312 "c(1)" is generated, the weighting unit 2601 of AP2520-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(1)×A1(0)(3335), c(1)×A1(1)(3336), c(1)×A1(2)(3337), and c(1)×A1(3)(3338).

[0576] AP2520-1 wirelessly outputs c(1)×A1(0)(3335), c(1)×A1(1)(3336), c(1)×A1(2)(3337), and c(1)×A1(3)(3338).

[0577] When generating the mapped complex baseband signals 3313 “c(2)”, 3314 “c(3)”, etc., AP2520-1 also performs the same operation as described above.

[0578] (AP2520-2 processing)

[0579] The mapping unit 206 of AP2520-2 is as follows: Figure 33 It is shown that the mapped baseband signal complex numbers 3311 "c(0)", 3312 "c(1)", 3313 "c(2)", 3314 "c(3)", etc. are generated.

[0580] Furthermore, let c(0) be the mapped baseband signal associated with data packet 3211. Let c(1) be the mapped baseband signal associated with data packet 3213, let c(2) be the mapped baseband signal associated with data packet 3214, let c(3) be the mapped baseband signal associated with data packet 3216, and so on.

[0581] If the mapped baseband signal complex number 3311 "c(0)" is generated, the weighting unit 2601 of AP2520-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(0)×A2(0)(3341), c(0)×A2(1)(3342), c(0)×A2(2)(3343), and c(0)×A2(3)(3344).

[0582] AP2520-2 wirelessly outputs c(0)×A2(0)(3341), c(0)×A2(1)(3342), c(0)×A2(2)(3343), and c(0)×A2(3)(3344).

[0583] If the mapped baseband signal complex number 3312 "c(1)" is generated, the weighting unit 2601 of AP2520-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(1)×A2(0)(3345), c(1)×A2(1)(3346), c(1)×A2(2)(3347), and c(1)×A2(3)(3348).

[0584] AP2520-2 wirelessly outputs c(1)×A2(0)(3345), c(1)×A2(1)(3346), c(1)×A2(2)(3347), and c(1)×A2(3)(3348).

[0585] When generating the mapped complex baseband signals 3313 “c(2)”, 3314 “c(3)”, etc., AP2520-2 also performs the same operation as described above.

[0586] (Processing of AP2520-3)

[0587] The mapping unit 206 of the AP 2520 - 3 generates mapped complex baseband signals “d(0)”, “d(1)”, “d(2)”, etc.

[0588] Furthermore, let d(0) be the mapped baseband signal associated with data packet 3251. Let d(1) be the mapped baseband signal associated with data packet 3252, let d(2) be the mapped baseband signal associated with data packet 3253, and so on.

[0589] If the mapped baseband signal complex number "d(0)" is generated, such as Figure 33 As shown, AP2520-3 wirelessly outputs the mapped baseband signal complex number "d(0)" (3351).

[0590] If the mapped baseband signal complex number "d(1)" is generated, such as Figure 33 As shown, AP2520-3 wirelessly outputs the mapped baseband signal complex number "d(1)" (3352).

[0591] Below, similarly, AP2520-3, such as Figure 33It shows that the mapped baseband signal complex numbers "d(2)", "d(3)", "d(4)", ..., "d(7)", ... are generated, and "d(2)", "d(3)", "d(4)", ..., "d(7)", ... are generated by wireless output.

[0592] (Processing of AP2520-4)

[0593] The mapping unit 206 of the AP 2520 - 4 generates mapped complex baseband signals “e(0)”, “e(1)”, “e(2)”, etc.

[0594] Furthermore, let e(0) be the mapped baseband signal associated with data packet 3261. Let e(1) be the mapped baseband signal associated with data packet 3262, let e(2) be the mapped baseband signal associated with data packet 3263, and so on.

[0595] If the mapped baseband signal complex number "e(0)" is generated, such as Figure 33 As shown, AP2520-4 wirelessly outputs the mapped baseband signal complex number "e(0)" (3361).

[0596] If the mapped baseband signal complex number "e(1)" is generated, such as Figure 33 As shown, AP2520-4 wirelessly outputs the mapped baseband signal complex number "e(1)" (3362).

[0597] Below, similarly, AP2520-4, such as Figure 33 It is shown that the mapped baseband signal complex numbers "e(2)", "e(3)", "e(4)", ..., "e(7)", ... are generated, and "e(2)", "e(3)", "e(4)", ..., "e(7)", ... are generated by wireless output.

[0598] As described above, each data packet for multicast is weighted differently and transmitted multiple times, and each data packet for multicast is transmitted multiple times from multiple APs.

[0599] By using multiple APs for transmission, the cell area can be expanded, and each data packet for multicast is sent multiple times with different weights, thereby sending the data packet multiple times with different directionality. Therefore, it has the effect of maintaining more uniform reception quality within the cell area.

[0600] In addition, AP2520-3 and AP2520-4 have the flexibility of transmitting unicast data.

[0601] For example, there is the advantage that switching according to time (for example, switching according to the presence of the terminal) is Figure 28 The sending status, Figure 30 The sending status, Figure 32 The sending status of the message can be determined, thereby enabling a flexible system.

[0602] 4.5 Summary

[0603] This aspect enables high-capacity transmission at Gbps. Furthermore, when multicast is implemented, the number of terminals that can be accommodated can be increased. Furthermore, unicast communication can be performed simultaneously with multicast, making the system more flexible.

[0604] 5. Example 4

[0605] A wireless communication system 3400 according to another fourth embodiment of the present disclosure will be described.

[0606] 5.1 Wireless Communication System 3400

[0607] Wireless communication system 3400, such as Figure 34 As shown, the system includes a mother station 3410, AP 3420-1, AP 3420-2, AP 3420-3, AP 3420-4, and terminals 3430-1, 3430-2, ..., and 3430-8.

[0608] The mother station 3410 is connected to a communication device (not shown) directly or indirectly via a communication line. Here, the communication device is, as an example, a broadcast device that broadcasts data, a distribution system that sends data, a server, etc. The communication device sends control signals and data. The control signal includes settings for a unicast transmission method or a multicast transmission method, as well as settings for a weighted method. Furthermore, the communication device may be composed of multiple communication devices. In this case, the first communication device may send a control signal, and the second communication device may send data. The mother station 3410 is connected to AP3420-1, AP3420-2, AP3420-3, and AP3420-4 by wire (or wireless). Furthermore, AP3420-1 is connected to AP3420-2, AP3420-3, and AP3420-4 by wire (or wireless).

[0609] Mother station 3410 receives control signals and data from the communication device. Mother station 3410 transmits control signals to AP 3420-1. Furthermore, mother station 3410 transmits data to APs 3420-1, 3420-2, 3420-3, and 3420-4. Furthermore, APs 3420-1, 3420-2, 3420-3, and 3420-4 wirelessly transmit the data received from mother station 3410.

[0610] Terminals 3430-1, 3430-2, ..., and 3430-8 are each mobile phones, smartphones, tablet computers, and personal computers (PCs) equipped with wireless communication capabilities utilizing frequency bands above 6 GHz, such as those called millimeter waves, for example, the 60 GHz frequency band. For example, when terminal 3430-1 is located close to AP 3420-1, it wirelessly receives data from AP 3420-1. Similarly to terminal 3430-1, terminals 3430-2, ..., and 3430-8 also wirelessly receive data from the nearby AP.

[0611] Then, the terminal 3430 - 1 wirelessly transmits data. If the terminal 3430 - 1 is located close to the AP 3420 - 1 , the AP 3420 - 1 wirelessly receives data from the terminal 3430 - 1 . The AP 3420 - 1 transmits the received data to the master station 3410 .

[0612] Terminals 3430-2, 3430-3, ..., and 3430-8 also transmit data wirelessly, similar to terminal 3430-1. An AP located near each terminal wirelessly receives data from the terminal. The AP transmits the data received from the terminal to the master station 3410.

[0613] The mother station 3410 receives data from each terminal via each AP and outputs the received data to the communication device.

[0614] The control signal sent from master station 3410 to AP 3420-1 includes settings for unicast transmission or multicast transmission for each AP, as well as settings for the weighting method for each AP. Master station 3410 does not configure unicast transmission or multicast transmission for APs 3420-2, 3420-3, and 3420-4. Furthermore, master station 3410 does not configure the weighting method for each AP for APs 3420-2, 3420-3, and 3420-4.

[0615] AP3420-1 configures unicast transmission and multicast transmission for AP3420-2, AP3420-2, and AP3420-3. AP3420-1 also configures a weighting method for AP3420-2, AP3420-2, and AP3420-3.

[0616] AP 3420 - 1 is referred to as a master AP, and AP 3420 - 2 , AP 3420 - 3 , and AP 3420 - 4 are referred to as non-master APs.

[0617] 5.2 AP3420-1 as the Master AP

[0618] AP3420-1 as the master AP, such as Figure 35 As shown, the system is composed of an encoder 202, an interleaver 204, a mapping unit 206, a weighting unit 3511, a wireless unit 210, an antenna 212, an antenna 215, a receiving device 217 and an instruction unit 3502.

[0619] AP 3420-1 receives a control signal 3501 from the master station 3410. The control signal 3501 includes settings regarding unicast transmission or multicast transmission, and settings regarding a weighting method.

[0620] AP 3420-1 configures unicast transmission or multicast transmission based on control signal 3501 received from master station 3410. Furthermore, AP 3420-1 configures a weighting method based on control signal 3501. If multicast transmission is configured, it is configured to use the same frequency (band) as other APs.

[0621] When the AP 3420 - 1 is set to unicast transmission, it operates the receiving device 217. Alternatively, when the AP 3420 - 1 is set to multicast transmission, it may stop the receiving device 217.

[0622] The AP3420-1 uses the same channel for wireless transmission and reception in both unicast and multicast transmissions. The AP3420-1 can also divide a single wireless carrier into multiple time slots, using each time slot as a communication channel. Furthermore, the AP3420-1 can use multiple different frequencies in the 60 GHz band, using each frequency as a communication channel.

[0623] (1) Encoder 202

[0624] Encoder 202 receives data 201 from parent station 3410. Furthermore, encoder 202 receives control signal 213 from a controller within AP 3420-1. Control signal 213 includes information such as the encoding scheme, error correction scheme, coding rate, and block length. Encoder 202 performs error correction encoding on data 201 using the scheme specified by control signal 213, such as convolutional coding, LDPC coding, or turbo coding. Encoder 202 outputs encoded data 203.

[0625] (2) Interleaver 204

[0626] Interleaver 204 receives encoded data 203 from encoder 202. Furthermore, interleaver 204 receives control signal 213 from a controller included in AP 3420-1. Control signal 213 specifies an interleaving method. Interleaver 204 interleaves, or rearranges the order of, encoded data 203 using the interleaving method specified by control signal 213. Interleaver 204 outputs interleaved data 205.

[0627] (3) Mapping Unit 206

[0628] Mapping unit 206 receives interleaved data 205 from interleaver 204. Mapping unit 206 also receives control signal 213 from a controller included in AP 3420-1. Control signal 213 specifies a modulation scheme. Based on the modulation scheme specified in control signal 213, mapping unit 206 performs modulation on interleaved data 205 using, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation), or 64QAM (64 Quadrature Amplitude Modulation), generating modulated signal 207. Mapping unit 206 outputs modulated signal 207. Other modulation schemes may also be used.

[0629] Furthermore, the mapping unit 206 may perform mapping including weighting processing.

[0630] (4) Weighting Unit 3511

[0631] Weighting unit 3511 receives modulated signal 207 from mapping unit 206. Furthermore, weighting unit 3511 receives control signal 3503_0. Control signal 3503_0 includes a weighting method setting. Weighting unit 3511 weights modulated signal 207 based on the weighting method setting included in control signal 3503_0, generating weighted signal 3512. Weighting unit 3511 outputs weighted signal 3512.

[0632] (5) Wireless Unit 210 and Antenna 212

[0633] Radio unit 210 receives weighted signal 3512 from weighting unit 3511. Furthermore, radio unit 210 receives control signal 213 from a controller included in AP 3420-1. Control signal 213 includes instructions for frequency conversion, amplification, and the like. Radio unit 210 performs frequency conversion, amplification, and other processing on weighted signal 3512 to generate transmit data 211. Radio unit 210 outputs generated transmit signal 211 to antenna 212 using a frequency band above 6 GHz, such as millimeter waves, and, for example, a frequency band of 60 GHz.

[0634] The antenna 212 outputs the transmission signal 211 as radio waves.

[0635] (6) Antenna 215 and receiving device 217

[0636] Antenna 215 receives signal 216 output as radio waves from each terminal.

[0637] Receiver 217 receives signal 216 from antenna 215 using a frequency band above 6 GHz, such as millimeter waves, for example, a frequency band of 60 GHz, performs processing such as amplification and frequency conversion, and generates data 218. Receiver 217 outputs data 218 to master station 3410.

[0638] Furthermore, antenna 212 and antenna 215 may be the same antenna, but are labeled differently for ease of description.

[0639] (7) Instruction unit 3502

[0640] The instruction unit 3502 is connected to the mother station 3410 .

[0641] The instruction unit 3502 receives the control signal 3501 from the master station 3410. The control signal 3501 includes settings regarding unicast transmission or multicast transmission, and settings regarding a weighting method.

[0642] Furthermore, the control signal 3501 may be set individually for each AP, or the same control signal 3501 may be set for all APs.

[0643] The instruction unit 3502 performs multicast setting or unicast setting for all APs including the AP 3420 - 1 using the control signal 3503_0 , the control signal 3503_1 , ..., and the control signal 3503_N.

[0644] Here, the instruction unit 3502 may set all APs to multicast transmission or unicast transmission. Alternatively, the instruction unit 3502 may set some APs to multicast transmission and others to unicast transmission. In this way, the settings for multicast transmission and unicast transmission may be mixed for each AP.

[0645] For multiple APs configured for multicast, the modulated signals before weighting become the same signal. In other words, the same data is transmitted.

[0646] Furthermore, the instruction unit 3502 instructs each AP on a weighting method using the control signal 3503_0, the control signal 3503_1, ..., and the control signal 3503_N.

[0647] For multiple APs configured for unicast, the modulated signals before weighting can be the same or different. In other words, they may send the same data or different data.

[0648] In this manner, instruction unit 3502 generates control signals 3503_0, 3503_1, ..., and 3503_N for each AP based on received control signal 3501. Each control signal includes settings for multicast transmission or unicast transmission, as well as settings for the phase change method. Instruction unit 3502 outputs control signals 3503_0, 3503_1, ..., and 3503_N to itself, AP 3420-2, AP 3420-3, and AP 3420-4.

[0649] When unicast transmission is specified for AP3420-1, the instruction unit 3502 activates the receiving device 217. Alternatively, when multicast transmission is specified for AP3420-1, the instruction unit 3502 may stop the operation of the receiving device 217.

[0650] 5.3 Non-Master AP3600

[0651] AP3420-2, AP3420-3, and AP3420-4 are non-master APs. Here, AP3600 is used to represent AP3420-2, AP3420-3, and AP3420-4.

[0652] Non-master AP3600, such as Figure 36 As shown, the system is composed of an encoder 202, an interleaver 204, a mapping unit 206, a weighting unit 3611, a wireless unit 210, an antenna 212, an antenna 215 and a receiving device 217.

[0653] AP 3600 receives control signal 3601_0 from AP 3420-1, acting as the master AP. Control signal 3601_0 includes settings for unicast transmission, multicast transmission, and weighting methods. Furthermore, AP 3600 receives data 3602 from AP 3420-1, acting as the master AP. Furthermore, when AP 3600 is collaborating with other APs, it may receive data 3603 from other non-master APs. Furthermore, when AP 3600 is operating independently using unicast transmission, it may receive data 201 from master station 3410.

[0654] AP 3600, based on control signal 3601_0, configures unicast or multicast transmission. Furthermore, AP 3600, based on control signal 3601_0, configures a weighting method. If multicast transmission is configured, AP 3600 is configured to use the same frequency (band) as other APs.

[0655] When the AP 3600 is set to unicast transmission, the AP 3600 operates the receiving device 217. Alternatively, when the AP 3600 is set to multicast transmission, the AP 3600 may stop the receiving device 217.

[0656] The AP3600 uses the same channel (or frequency) for wireless transmission and reception in both unicast and multicast transmissions. The AP3600 can also divide a single wireless carrier into multiple time slots, using each time slot as a communication channel. Furthermore, the AP3600 can use multiple different frequencies in the 60 GHz band, using each frequency as a communication channel.

[0657] (1) Encoder 202

[0658] Encoder 202 receives data 3602, data 3603, or data 201. Furthermore, encoder 202 receives control signal 213 from a controller included in AP 3600. Control signal 213 includes information such as the encoding method, error correction method, coding rate, and block length. Encoder 202 performs error correction encoding on data 201 using the method specified by control signal 213, such as convolutional coding, LDPC coding, or turbo coding. Encoder 202 outputs encoded data 203.

[0659] (2) Interleaver 204

[0660] Interleaver 204 receives encoded data 203 from encoder 202. Furthermore, interleaver 204 receives control signal 213 from a controller included in AP 3600. Control signal 213 specifies an interleaving method. Interleaver 204 interleaves, or rearranges, the sequence of encoded data 203 using the interleaving method specified by control signal 213. Interleaver 204 outputs interleaved data 205.

[0661] (3) Mapping Unit 206

[0662] Mapping unit 206 receives interleaved data 205 from interleaver 204. Mapping unit 206 also receives control signal 213 from a controller included in AP 3600. Control signal 213 specifies a modulation scheme. Based on the modulation scheme specified in control signal 213, mapping unit 206 performs modulation on interleaved data 205 using, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16Quadrature Amplitude Modulation), or 64QAM (64Quadrature Amplitude Modulation), generating modulated signal 207. Mapping unit 206 outputs modulated signal 207. Other modulation schemes may also be used.

[0663] Furthermore, the mapping unit 206 may perform mapping including weighting processing.

[0664] (4) Weighted Section 3611

[0665] Weighting unit 3611 receives modulated signal 207 from mapping unit 206. Furthermore, weighting unit 3611 receives control signal 3601_0. Control signal 3601_0 includes a weighting method setting. Weighting unit 3611 weights modulated signal 207 based on the weighting method setting included in control signal 3601_0, generating weighted signal 3612. Weighting unit 3611 outputs weighted signal 3612.

[0666] (5) Wireless Unit 210 and Antenna 212

[0667] Radio unit 210 receives weighted signal 3612 from weighting unit 3611. Furthermore, radio unit 210 receives control signal 213 from a controller included in AP 3600. Control signal 213 includes instructions for frequency conversion, amplification, and the like. Radio unit 210 performs frequency conversion, amplification, and other processing on weighted signal 3612 to generate transmit data 211. Radio unit 210 outputs generated transmit signal 211 to antenna 212 using a frequency band above 6 GHz, such as millimeter waves, and, for example, a frequency band of 60 GHz.

[0668] The antenna 212 outputs the transmission signal 211 as radio waves.

[0669] (6) Antenna 215 and receiving device 217

[0670] Antenna 215 receives signal 216 output as radio waves from each terminal.

[0671] Receiver 217 receives signal 216 from antenna 215 using a frequency band above 6 GHz, such as millimeter waves, for example, a frequency band of 60 GHz, performs processing such as amplification and frequency conversion, and generates data 218. Receiver 217 outputs data 218 to master station 3410.

[0672] Furthermore, antenna 212 and antenna 215 may be the same antenna, but are labeled differently for ease of description.

[0673] 5.4 Mother Station 3410

[0674] Mother station 3410, such as Figure 37 As shown, it is composed of a transmission data distribution unit 302, a reception data distribution unit 305 and an instruction unit 308.

[0675] (1) Instruction unit 308

[0676] The instruction unit 308 is connected to the communication device, and AP 3420 - 1 , AP 3420 - 2 , AP 3420 - 3 , and AP 3420 - 4 .

[0677] Instruction unit 308 receives control signal 307. Control signal 307 includes settings for unicast transmission, multicast transmission, and weighting method. The communication device includes a PC as an example, and the user of the PC inputs the control signal through the PC.

[0678] Furthermore, the control signal 307 may be set individually for each AP, or the same control signal 307 may be set for all APs.

[0679] You can set all APs to multicast, or you can set all APs to unicast. You can also set some APs to multicast, and others to unicast. In this way, you can mix multicast and unicast settings for each AP.

[0680] For multiple APs configured for multicast, the modulated signals before weighting become the same signal. In other words, the same data is transmitted.

[0681] Furthermore, the weighting method is indicated for each AP.

[0682] For multiple APs configured for unicast, the modulated signals before weighting can be the same or different. In other words, they may send the same data or different data.

[0683] The instruction unit 308 outputs the received control signal 307 to the transmission data allocation unit 302 , the reception data allocation unit 305 , and the APs 3420 - 1 , 3420 - 2 , 3420 - 3 , and 3420 - 4 .

[0684] (2) The transmission data distribution unit 302 is connected to the communication device, the instruction unit 308, and the AP 3420-1, the AP 3420-2, the AP 3420-3, and the AP 3420-4.

[0685] The transmission data allocation unit 302 receives the control signal from the instruction unit 308. The transmission data allocation unit 302 outputs the received control signal to AP 3420-1, AP 3420-2, AP 3420-3, and AP 3420-4.

[0686] Furthermore, the transmission data distribution unit 302 receives data from the communication device. It distributes the received data to AP 3420-1, AP 3420-2, AP 3420-3, and AP 3420-4. The transmission data distribution unit 302 outputs the distributed data to AP 3420-1, AP 3420-2, AP 3420-3, and AP 3420-4, respectively.

[0687] (3) Received Data Distribution Unit 305

[0688] The received data distribution unit 305 is connected to the communication device, the instruction unit 308 , and the APs 3420 - 1 , 3420 - 2 , 3420 - 3 , and 3420 - 4 .

[0689] The received data distribution unit 305 receives data from each of AP 3420 - 1 , AP 3420 - 2 , AP 3420 - 3 , and AP 3420 - 4 , and outputs the received data to the communication device.

[0690] 5.5 Example of sent data

[0691] An example of data transmitted by the parent station 3410 , AP 3420 - 1 , AP 3420 - 2 , AP 3420 - 3 , and AP 3420 - 4 will be described below.

[0692] (1) When all APs are configured for multicast transmission

[0693] For example, when all AP3420-1, AP3420-2, AP3420-3, and AP3420-4 are set to multicast transmission, data is transmitted. Figure 38 as well as Figure 39 Provide explanation.

[0694] Mother station 3410, such as Figure 38 As shown, packets 3811, 3812, 3813, 3814, ... are received in sequence. Here, packets 3811, 3812, 3813, 3814, ... are all multicast packets. Furthermore, packets 3811, 3812, 3813, 3814, ... are generated from a single multicast data packet. Parent station 3410 sequentially transmits packets 3811, 3812, 3813, 3814, ... to AP 3420-1.

[0695] AP 3420-1 sequentially receives data packets 3811, 3812, 3813, 3814, .... Then, AP 3420-1 sequentially sends data packets 3811, 3812, 3813, 3814, ... to AP 3420-2, AP 3420-3, and AP 3420-4.

[0696] (a) Processing 1 of each AP

[0697] like Figure 34 、 Figure 38 As shown, in AP3420-1, A1(0), A1(1), A1(2), A1(3), ... are prepared as weights. Similarly, in AP3420-2, A2(0), A2(1), A2(2), A2(3), ... are prepared as weights. In AP3420-3, A3(0), A3(1), A3(2), A3(3), ... are prepared as weights. In AP3420-4, A4(0), A4(1), A4(2), A4(3), ... are prepared as weights.

[0698] (b) Processing 2 of each AP

[0699] Next, for another example of processing of each AP, use Figure 39 Provide explanation.

[0700] (Processing of AP3420-1)

[0701] The mapping unit 206 of AP3420-1 is as follows: Figure 39 It is shown that mapped baseband signal complex numbers 3911 "c(0)", 3912 "c(1)", 3913 "c(2)", 3914 "c(3)", etc. are generated. Moreover, c(0) is set as the mapped baseband signal related to data packet 3811. Moreover, c(1) is set as the mapped baseband signal related to data packet 3812, c(2) is set as the mapped baseband signal related to data packet 3813, c(3) is set as the mapped baseband signal related to data packet 3814, etc.

[0702] If the mapped baseband signal complex number 3911 "c(0)" is generated, the weighting unit 3511 of AP3420-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(0)×A1(0)(3931), c(0)×A1(1)(3932), c(0)×A1(2)(3933), and c(0)×A1(3)(3934).

[0703] AP3420-1 wirelessly outputs c(0)×A1(0)(3931), c(0)×A1(1)(3932), c(0)×A1(2)(3933), and c(0)×A1(3)(3934).

[0704] If the mapped baseband signal complex number 3912 "c(1)" is generated, the weighting unit 3511 of AP3420-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(1)×A1(0)(3935), c(1)×A1(1)(3936), c(1)×A1(2)(3937), and c(1)×A1(3)(3938).

[0705] AP3420-1 wirelessly outputs c(1)×A1(0)(3935), c(1)×A1(1)(3936), c(1)×A1(2)(3937), and c(1)×A1(3)(3938).

[0706] When generating the mapped complex baseband signals 3913 “c(2)”, 3914 “c(3)”, etc., AP3420-1 also performs the same operation as described above.

[0707] (AP3420-2 processing)

[0708] The mapping unit 206 of AP3420-2 is as follows: Figure 39 It is shown that mapped baseband signal complex numbers 3911 "c(0)", 3912 "c(1)", 3913 "c(2)", 3914 "c(3)", etc. are generated. Moreover, c(0) is set as the mapped baseband signal related to data packet 3811. Moreover, c(1) is set as the mapped baseband signal related to data packet 3812, c(2) is set as the mapped baseband signal related to data packet 3813, c(3) is set as the mapped baseband signal related to data packet 3814, etc.

[0709] If the mapped baseband signal complex number 3911 "c(0)" is generated, the weighting unit 3611 of AP3420-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(0)×A2(0)(3941), c(0)×A2(1)(3942), c(0)×A2(2)(3943), and c(0)×A2(3)(3944).

[0710] AP3420-2 wirelessly outputs c(0)×A2(0)(3941), c(0)×A2(1)(3942), c(0)×A2(2)(3943), and c(0)×A2(3)(3944).

[0711] If the mapped baseband signal complex number 3912 "c(1)" is generated, the weighting unit 3611 of AP3420-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(1)×A2(0)(3945), c(1)×A2(1)(3946), c(1)×A2(2)(3947), and c(1)×A2(3)(3948).

[0712] AP3420-2 wirelessly outputs c(1)×A2(0)(3945), c(1)×A2(1)(3946), c(1)×A2(2)(3947), and c(1)×A2(3)(3948).

[0713] When generating the mapped complex baseband signals 3913 “c(2)”, 3914 “c(3)”, etc., AP3420-2 also performs the same operation as described above.

[0714] (Processing of AP3420-3 and AP3420-4)

[0715] AP3420-3 and AP3420-4 also perform the same operations as described above.

[0716] Furthermore, the weighting unit 2601 of AP3420-3 performs weighting using the complex number A3(0), the complex number A3(1), the complex number A3(2), and the complex number A3(3).

[0717] Furthermore, the weighting unit 2601 of AP3420-4 performs weighting using the complex number A4(0), the complex number A4(1), the complex number A4(2), and the complex number A4(3).

[0718] As described above, it has the characteristics of weighting each data packet differently and sending it multiple times, and it also has the characteristics of sending each data packet multiple times from multiple APs.

[0719] Using multiple APs for transmission has the effect of expanding the cell area, and each data packet is sent multiple times with different weights, thereby sending the data packet multiple times with different directionality. Therefore, it has the effect of maintaining more uniform reception quality within the cell area.

[0720] The weighting coefficients A1(i), A2(i), A3(i), and A4(i) are considered to have the following properties, for example.

[0721] Suppose that the modulated signal of packet A is transmitted N times (N is an integer greater than or equal to 2). In this case, let the weighting coefficient for the modulated signal used to transmit packet A the uth time be A1(u). Let the weighting coefficient for the modulated signal used to transmit packet A the vth time be A1(v). Furthermore, let u and v be integers greater than or equal to 1 and less than or equal to N, such that u ≠ v holds. In this case, u and v are integers greater than or equal to 1 and less than or equal to N, and u ≠ v holds. For all u and all v that satisfy this, A1(u) ≠ A1(v).

[0722] Similarly, assume that the modulated signal of packet A is transmitted N times (N is an integer greater than or equal to 2). In this case, let the weighting coefficient of the modulated signal used to transmit packet A the uth time be Ak(u). Let the weighting coefficient of the modulated signal used to transmit packet A the vth time be Ak(v). Furthermore, assume that u and v are integers greater than or equal to 1 and less than or equal to N, and u ≠ v holds. In this case, u and v are integers greater than or equal to 1 and less than or equal to N, and u ≠ v holds. For all u and all v that satisfy this, Ak(u) ≠ Ak(v) (k is an integer greater than or equal to 1).

[0723] Furthermore, the weighting coefficient Ak(i) may have a period. If the period is M (M is an integer greater than or equal to 2), the following equation holds.

[0724] [Number 9]

[0725] Ak(i)=Ak(i mod M)···Formula (9)

[0726] Set i mod M to the remainder when i is divided by M.

[0727] (2) When AP3420-1 and AP3420-2 are configured for multicast transmission, and AP3420-3 and AP3420-4 are configured for unicast transmission, and data is transmitted.

[0728] For example, when AP3420-1 and AP3420-2 are configured for multicast transmission and AP3420-3 and AP3420-4 are configured for unicast transmission, data is transmitted. Figure 40 as well as Figure 41 In this case, AP 3420 - 3 and AP 3420 - 4 transmit the same data (the modulated signals after mapping are the same).

[0729] Mother station 3410, such as Figure 40As shown, data packets 4011, 4012, 4013, 4014, ... are received in sequence. Here, data packets 4011, 4013, 4014, 4016, ... are multicast data packets. Data packets 4011, 4013, 4014, 4016, ... are generated from a single multicast data packet. Furthermore, data packets 4012, 4015, ... are unicast data packets. Data packets 4012, 4015, ... are generated from a single unicast data packet.

[0730] The mother station 3410 sequentially outputs multicast packets 4011, 4013, 4014, 4016, ... to AP 3420-1. Furthermore, the mother station 3410 sequentially outputs unicast packets 4012, 4015, ... to AP 3420-3 and AP 3420-4, respectively.

[0731] AP 3420-1 receives multicast packets 4011, 4013, 4014, 4016, etc. AP 3420-1 sends multicast packets 4011, 4013, 4014, 4016, etc., to AP 3420-2.

[0732] (a) Processing of each AP 1

[0733] like Figure 34 、 Figure 40 As shown, in AP3420-1, A1(0), A1(1), A1(2), A1(3), ... are prepared as weights. Similarly, in AP3420-2, A2(0), A2(1), A2(2), A2(3), ... are prepared as weights.

[0734] (b) Processing 2 of each AP

[0735] Next, for another example of processing of each AP, use Figure 41 Provide explanation.

[0736] (Processing of AP3420-1)

[0737] The mapping unit 206 of AP3420-1 is as follows: Figure 41It is shown that mapped baseband signal complex numbers 4111 "c(0)", 4112 "c(1)", 4113 "c(2)", 4114 "c(3)", etc. are generated. Moreover, c(0) is set to the mapped baseband signal related to data packet 4011. Moreover, c(1) is set to the mapped baseband signal related to data packet 4013, c(2) is set to the mapped baseband signal related to data packet 4014, c(3) is set to the mapped baseband signal related to data packet 4016, etc.

[0738] If the mapped baseband signal complex number 4111 "c(0)" is generated, the weighting unit 3511 of AP3420-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(0)×A1(0)(4131), c(0)×A1(1)(4132), c(0)×A1(2)(4133), and c(0)×A1(3)(4134).

[0739] AP3420-1 wirelessly outputs c(0)×A1(0)(4131), c(0)×A1(1)(4132), c(0)×A1(2)(4133), and c(0)×A1(3)(4134).

[0740] If the mapped baseband signal complex number 4112 "c(1)" is generated, the weighting unit 3511 of AP3420-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(1)×A1(0)(4135), c(1)×A1(1)(4136), c(1)×A1(2)(4137), and c(1)×A1(3)(4138).

[0741] AP3420-1 wirelessly outputs c(1)×A1(0)(4135), c(1)×A1(1)(4136), c(1)×A1(2)(4137), and c(1)×A1(3)(4138).

[0742] When generating the mapped complex baseband signals 4113 “c(2)”, 4114 “c(3)”, etc., AP3420-1 also performs the same operation as described above.

[0743] (AP3420-2 processing)

[0744] The mapping unit 206 of AP3420-2 is as follows: Figure 41It is shown that the mapped baseband signal complex numbers 4111 "c(0)", 4112 "c(1)", 4113 "c(2)", 4114 "c(3)", etc. are generated.

[0745] Furthermore, let c(0) be the mapped baseband signal associated with data packet 4011. Let c(1) be the mapped baseband signal associated with data packet 4013, let c(2) be the mapped baseband signal associated with data packet 4014, let c(3) be the mapped baseband signal associated with data packet 4016, and so on.

[0746] If the mapped baseband signal complex number 4111 "c(0)" is generated, the weighting unit 3611 of AP3420-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(0)×A2(0)(4141), c(0)×A2(1)(4142), c(0)×A2(2)(4143), and c(0)×A2(3)(4144).

[0747] AP3420-2 wirelessly outputs c(0)×A2(0)(4141), c(0)×A2(1)(4142), c(0)×A2(2)(4143), and c(0)×A2(3)(4144).

[0748] If the mapped baseband signal complex number 4112 "c(1)" is generated, the weighting unit 3611 of AP3420-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(1)×A2(0)(4145), c(1)×A2(1)(4146), c(1)×A2(2)(4147), and c(1)×A2(3)(4148).

[0749] AP3420-2 wirelessly outputs c(1)×A2(0)(4145), c(1)×A2(1)(4146), c(1)×A2(2)(4147), and c(1)×A2(3)(4148).

[0750] When generating the mapped complex baseband signals 4113 “c(2)”, 4114 “c(3)”, etc., AP3420-2 also performs the same operation as described above.

[0751] (Processing of AP3420-3)

[0752] The mapping unit 206 of the AP 3420 - 3 generates mapped complex baseband signals “d(0)”, “d(1)”, “d(2)”, “d(3)”, etc.

[0753] Furthermore, let d(0) be the mapped baseband signal associated with data packet 4051. Let d(1) be the mapped baseband signal associated with data packet 4052, let d(2) be the mapped baseband signal associated with data packet 4053, and so on.

[0754] If the mapped baseband signal complex number "d(0)" is generated, AP3420-3 wirelessly outputs the generated d(0) (4151).

[0755] If the mapped baseband signal complex number "d(1)" is generated, AP3420-3 wirelessly outputs the generated d(1) (4152).

[0756] Similarly, when the mapped baseband signal complex numbers "d(2)", "d(3)", ... are generated, AP3420-3 wirelessly outputs the generated "d(2)", "d(3)", ...

[0757] (Processing of AP3420-4)

[0758] The mapping unit 206 of the AP 3420 - 4 generates mapped complex baseband signals “d(0)”, “d(1)”, “d(2)”, “d(3)”, etc.

[0759] Furthermore, let d(0) be the mapped baseband signal associated with data packet 4061. Let d(1) be the mapped baseband signal associated with data packet 4062, let d(2) be the mapped baseband signal associated with data packet 4063, and so on.

[0760] If the mapped baseband signal complex number "d(0)" is generated, AP3420-4 wirelessly outputs the generated d(0) (4161).

[0761] If the mapped baseband signal complex number "d(1)" is generated, AP3420-4 wirelessly outputs the generated d(1) (4162).

[0762] Similarly, when the mapped baseband signal complex numbers "d(2)", "d(3)", ... are generated, AP3420-4 wirelessly outputs the generated "d(2)", "d(3)", ...

[0763] As described above, each data packet for multicast is weighted differently and transmitted multiple times, and each data packet for multicast is transmitted multiple times from multiple APs.

[0764] By using multiple APs for transmission, the cell area can be expanded, and each data packet for multicast is sent multiple times with different weights, thereby sending the data packet multiple times with different directionality. Therefore, it has the effect of maintaining more uniform reception quality within the cell area.

[0765] Furthermore, AP2520-3 and AP2520-4 may also change the phase or weighting in terms of time and frequency, thereby achieving an effect of improving the reception quality of unicast data packets.

[0766] (3) When AP3420-1 and AP3420-2 are set for multicast transmission, and AP3420-3 and AP3420-4 are set for unicast transmission

[0767] For example, when AP3420-1 and AP3420-2 are configured for multicast transmission and AP3420-3 and AP3420-4 are configured for unicast transmission, data is transmitted. Figure 42 as well as Figure 43 In this case, AP 3420-3 and AP 3420-4 transmit different data.

[0768] Mother station 3410, such as Figure 42 As shown, data packets 4211, 4212, 4213, 4214, 4215, 4216, ... are received in sequence. Here, data packets 4211, 4213, 4214, 4216, ... are multicast data packets. Data packets 4211, 4213, 4214, 4216, ... are generated from a single multicast data packet. Furthermore, data packets 4212, ... are first unicast data packets. Data packets 4212, ... are generated from first unicast data packets. Furthermore, data packets 4215, ... are second unicast data packets. Data packets 4215, ... are generated from second unicast data packets.

[0769] The mother station 3410 sequentially outputs multicast packets 4211, 4213, 4214, 4216, ... to AP 3420-1. Furthermore, the mother station 3410 sequentially outputs unicast packets 4212, ... to AP 3420-3. Furthermore, the mother station 3410 sequentially outputs unicast packets 4215, ... to AP 3420-4.

[0770] AP 3420-1 sequentially receives multicast packets 4211, 4213, 4214, 4216, .... Then, AP 3420-1 sequentially sends multicast packets 4211, 4213, 4214, 4216, ... to AP 3420-2.

[0771] (a) Processing of each AP 1

[0772] like Figure 34 、 Figure 42 As shown, in AP3420-1, A1(0), A1(1), A1(2), A1(3), ... are prepared as weights. Similarly, in AP3420-2, A2(0), A2(1), A2(2), A2(3), ... are prepared as weights.

[0773] (b) Processing 2 of each AP

[0774] Next, for another example of processing of each AP, use Figure 43 Provide explanation.

[0775] (Processing of AP3420-1)

[0776] The mapping unit 206 of AP3420-1 is as follows: Figure 43 It is shown that the mapped baseband signal complex numbers 4311 "c(0)", 4312 "c(1)", 4313 "c(2)", 4314 "c(3)", etc. are generated.

[0777] Furthermore, let c(0) be the mapped baseband signal associated with data packet 4211. Let c(1) be the mapped baseband signal associated with data packet 4213, let c(2) be the mapped baseband signal associated with data packet 4214, let c(3) be the mapped baseband signal associated with data packet 4216, and so on.

[0778] If the mapped baseband signal complex number 4311 "c(0)" is generated, the weighting unit 3511 of AP3420-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(0)×A1(0)(4331), c(0)×A1(1)(4332), c(0)×A1(2)(4333), and c(0)×A1(3)(4334).

[0779] AP3420-1 wirelessly outputs c(0)×A1(0)(4331), c(0)×A1(1)(4332), c(0)×A1(2)(4333), and c(0)×A1(3)(4334).

[0780] If the mapped baseband signal complex number 4312 "c(1)" is generated, the weighting unit 3511 of AP3420-1 uses the complex number A1(0), the complex number A1(1), the complex number A1(2), and the complex number A1(3) to calculate c(1)×A1(0)(4335), c(1)×A1(1)(4336), c(1)×A1(2)(4337), and c(1)×A1(3)(4338).

[0781] AP3420-1 wirelessly outputs c(1)×A1(0)(4335), c(1)×A1(1)(4336), c(1)×A1(2)(4337), and c(1)×A1(3)(4338).

[0782] When generating the mapped complex baseband signals 4313 “c(2)”, 4314 “c(3)”, etc., AP3420-1 also performs the same operation as described above.

[0783] (AP3420-2 processing)

[0784] The mapping unit 206 of AP3420-2 is as follows: Figure 43 It is shown that the mapped baseband signal complex numbers 4311 "c(0)", 4312 "c(1)", 4313 "c(2)", 4314 "c(3)", etc. are generated.

[0785] Furthermore, let c(0) be the mapped baseband signal associated with data packet 4211. Let c(1) be the mapped baseband signal associated with data packet 4213, let c(2) be the mapped baseband signal associated with data packet 4214, let c(3) be the mapped baseband signal associated with data packet 4216, and so on.

[0786] If the mapped baseband signal complex number 4311 "c(0)" is generated, the weighting unit 3611 of AP3420-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(0)×A2(0)(4341), c(0)×A2(1)(4342), c(0)×A2(2)(4343), and c(0)×A2(3)(4344).

[0787] AP3420-2 wirelessly outputs c(0)×A2(0)(4341), c(0)×A2(1)(4342), c(0)×A2(2)(4343), and c(0)×A2(3)(4344).

[0788] If the mapped baseband signal complex number 4312 "c(1)" is generated, the weighting unit 3611 of AP3420-2 uses the complex number A2(0), the complex number A2(1), the complex number A2(2), and the complex number A2(3) to calculate c(1)×A2(0)(4345), c(1)×A2(1)(4346), c(1)×A2(2)(4347), and c(1)×A2(3)(4348).

[0789] AP3420-2 wirelessly outputs c(1)×A2(0)(4345), c(1)×A2(1)(4346), c(1)×A2(2)(4347), and c(1)×A2(3)(4348).

[0790] When generating the mapped complex baseband signals 4313 “c(2)”, 4314 “c(3)”, etc., AP3420-2 also performs the same operation as described above.

[0791] (Processing of AP3420-3)

[0792] The mapping unit 206 of the AP 3420 - 3 generates mapped complex baseband signals “d(0)”, “d(1)”, “d(2)”, “d(3)”, etc.

[0793] Furthermore, let d(0) be the mapped baseband signal associated with data packet 4251. Let d(1) be the mapped baseband signal associated with data packet 4252, let d(2) be the mapped baseband signal associated with data packet 4253, and so on.

[0794] If the mapped baseband signal complex number "d(0)" is generated, AP3420-3 wirelessly outputs the generated d(0) (4351).

[0795] If the mapped baseband signal complex number "d(1)" is generated, AP3420-3 wirelessly outputs the generated d(1) (4352).

[0796] Similarly, when the mapped baseband signal complex numbers "d(2)", "d(3)", ... are generated, AP3420-3 wirelessly outputs the generated "d(2)", "d(3)", ...

[0797] (Processing of AP3420-4)

[0798] The mapping unit 206 of the AP 3420 - 4 generates mapped complex baseband signals “e(0)”, “e(1)”, “e(2)”, “e(3)”, etc.

[0799] Furthermore, let e(0) be the mapped baseband signal associated with data packet 4261. Let e(1) be the mapped baseband signal associated with data packet 4262, let e(2) be the mapped baseband signal associated with data packet 4263, and so on.

[0800] If the mapped baseband signal complex number "e(0)" is generated, AP3420-4 wirelessly outputs the generated e(0) (4361).

[0801] If the mapped baseband signal complex number "e(1)" is generated, AP3420-4 wirelessly outputs the generated e(1) (4362).

[0802] Similarly, when the mapped baseband signal complex numbers "d(2)", "d(3)", ... are generated, AP3420-3 wirelessly outputs the generated "d(2)", "d(3)", ...

[0803] As described above, each data packet for multicast is weighted differently and transmitted multiple times, and each data packet for multicast is transmitted multiple times from multiple APs.

[0804] By using multiple APs for transmission, the cell area can be expanded, and each data packet for multicast is sent multiple times with different weights, thereby sending the data packet multiple times with different directionality. Therefore, it has the effect of maintaining more uniform reception quality within the cell area.

[0805] In addition, AP3420-3 and AP3420-4 have the flexibility to transmit unicast data.

[0806] For example, there is the advantage that switching according to time (for example, switching according to the presence of the terminal) is Figure 38 The sending status, Figure 40 The sending status, Figure 42 The sending status of the message can be determined, thereby enabling a flexible system.

[0807] 5.6 Summary

[0808] This aspect enables high-capacity transmission at Gbps. Furthermore, when multicast is implemented, the number of terminals that can be accommodated can be increased. Furthermore, unicast communication can be performed simultaneously with multicast, making the system more flexible.

[0809] 6. Example 5

[0810] A wireless communication system 4400 according to another fifth embodiment of the present disclosure will be described.

[0811] 6.1 Wireless Communication System 4400

[0812] Wireless communication system 4400, such as Figure 44 As shown, it is composed of a mother station 4410-1, AP4420-1, AP4420-2, AP4420-3, AP4420-4, a mother station 4410-2, AP4420-11, AP4420-12, AP4420-13 and AP4420-14.

[0813] APs 4420-1, 4420-2, 4420-3, and 4420-4 are installed, for example, on the rooftop of building 4451, and mother station 4410-1 is installed, for example, inside building 4451. Furthermore, APs 4420-11, 4420-12, 4420-13, and 4420-14 are installed, for example, on the rooftop of building 4452, and mother station 4410-2 is installed, for example, inside building 4452. The installation method is not limited to this.

[0814] A case where there are no obstacles such as other buildings between AP4420-1, AP4420-2, AP4420-3, and AP4420-4, and AP4420-11, AP4420-12, AP4420-13, and AP4420-14 is one usage case (however, the present invention is not limited to such a usage case).

[0815] In the wireless communication system 4400 , wireless communication is performed between a building 4451 and a building 4452 via APs 4420 - 1 , 4420 - 2 , 4420 - 3 , and 4420 - 4 , and APs 4420 - 11 , 4420 - 12 , 4420 - 13 , and 4420 - 14 .

[0816] The mother station 4410-1 is connected directly or indirectly via a communication line to a communication device (not shown) (communication device A) that stores data sent by the AP. Here, communication device A is a mobile phone, a smartphone, a tablet computer, or a personal computer, as an example. Furthermore, communication device A may also be a broadcasting device that broadcasts data, a distribution system that sends data, or a server, as an example. Here, communication device A sends control signals for controlling the mother station and the AP, as well as "data for the AP to send." The control signal may also include a unicast setting. Furthermore, communication device A may be composed of multiple communication devices. In this case, the first communication device may send a control signal, and the second communication device may send data. Furthermore, communication device A may be used inside building 4451. Furthermore, communication device A may be used outside buildings 4451 and 4452. The master station 4410-1 is connected to AP4420-1, AP4420-2, AP4420-3, and AP4420-4 by wire (or wirelessly), and transmits data obtained from the communication device A to AP4420-1, AP4420-2, AP4420-3, and AP4420-4.

[0817] The control signal includes information on the setting parameters for each AP when performing unicast transmission and the parameters of the phase change method when each AP performs phase change.

[0818] AP 4420 - 1 is referred to as a master AP, and AP 4420 - 2 , AP 4420 - 3 , and AP 4420 - 4 are referred to as non-master APs.

[0819] Master station 4410-2 is connected to another communication device (communication device B) directly or indirectly via a communication line. Communication device B can be considered as a mobile phone, smartphone, tablet, personal computer, etc. as an example, but can also be considered as a communication device installed in a building or other structure, or outdoors. Communication device B may be used inside building 4452, but it can also be used outside buildings 4451 and 4452. Master station 4410-2 is connected to APs 4420-11, 4420-12, 4420-13, and 4420-14 via wired (or wireless) connections, and transmits data received from communication device B to APs 4420-1, 4420-2, 4420-3, and 4420-4.

[0820] AP4420-11 is also the master AP. AP4420-12, AP4420-13, and AP4420-14 are non-master APs.

[0821] 6.2 AP4420-1 as the Master AP

[0822] AP4420-1 as the main AP, such as Figure 45 As shown, it is composed of an encoder 202, an interleaver 204, a mapping unit 206, a phase change unit 208, a wireless unit 210, an antenna 212, an antenna 215, a receiving device 217 and an instruction unit 4402.

[0823] Furthermore, AP4420-11 is also a master AP, and therefore has the same structure as AP4420-1 which is the master AP.

[0824] AP 4420-1 receives a control signal 4401 from the master station 4410-1. The control signal 4401 includes settings for each AP regarding whether to perform unicast transmission and settings for phase change parameters when performing a phase change.

[0825] AP 4420 - 1 performs settings related to unicast transmission based on control signal 4401 received from master station 4410 - 1 AP 4420 - 1 also performs settings for parameters of a phase change method based on control signal 4401 .

[0826] When performing unicast transmission, AP 4420 - 1 activates the receiving device 217 .

[0827] (1) Encoder 202

[0828] Encoder 202 receives data 201 from parent station 4410-1. Furthermore, encoder 202 receives control signal 213 from a controller within AP 4420-1. Control signal 213 includes information such as the encoding scheme, error correction scheme, coding rate, and block length. Encoder 202 performs error correction encoding on data 201 using the scheme specified by control signal 213, such as convolutional coding, LDPC coding, or turbo coding. Encoder 202 outputs encoded data 203.

[0829] (2) Interleaver 204

[0830] Interleaver 204 receives encoded data 203 from encoder 202. Furthermore, interleaver 204 receives control signal 213 from a controller included in AP 4420-1. Control signal 213 specifies an interleaving method. Interleaver 204 interleaves, or rearranges the order of, encoded data 203 using the interleaving method specified by control signal 213. Interleaver 204 outputs interleaved data 205.

[0831] (3) Mapping Unit 206

[0832] Mapping unit 206 receives interleaved data 205 from interleaver 204. Mapping unit 206 also receives control signal 213 from a controller included in AP 4420-1. Control signal 213 specifies a modulation scheme. Based on the modulation scheme specified in control signal 213, mapping unit 206 performs modulation on interleaved data 205 using, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation), or 64QAM (64 Quadrature Amplitude Modulation), generating modulated signal 207. Mapping unit 206 outputs modulated signal 207. Other modulation schemes may also be used.

[0833] Furthermore, the mapping unit 206 may perform mapping including a process of changing the phase.

[0834] (4) Phase Changing Unit 208

[0835] Phase changer 208 receives modulated signal 207 from mapping unit 206. Furthermore, phase changer 208 receives control signal 4403_0. Control signal 4403_0 includes a setting for a phase change method. Phase changer 208 performs a phase change on modulated signal 207 based on the phase change method setting included in control signal 4403_0, generating phase-changed signal 209. Phase changer 208 outputs phase-changed signal 209.

[0836] (5) Wireless Unit 210 and Antenna 212

[0837] Radio unit 210 receives phase-changed signal 209 from phase changer 208. Furthermore, radio unit 210 receives control signal 213 from a controller included in AP 4420-1. Control signal 213 includes instructions for frequency conversion, amplification, and other operations. Radio unit 210 performs frequency conversion, amplification, and other processing on phase-changed data 209 to generate transmit data 211. Radio unit 210 outputs generated transmit signal 211 to antenna 212 using a frequency band above 6 GHz, such as millimeter waves, and, for example, a frequency band of 60 GHz.

[0838] The antenna 212 outputs the transmission signal 211 as radio waves.

[0839] (6) Antenna 215 and receiving device 217

[0840] Antenna 215 receives signal 216 output as radio waves from each terminal.

[0841] Receiver 217 receives signal 216 from antenna 215 using a frequency band above 6 GHz, such as millimeter waves, for example, 60 GHz, and performs processing such as amplification and frequency conversion to generate data 218. Receiver 217 outputs data 218 to master station 4410-1.

[0842] Furthermore, antenna 212 and antenna 215 may be the same antenna, but are labeled differently for ease of description.

[0843] (7) Instruction unit 4402

[0844] The instruction unit 4402 is connected to the master station 4410 - 1 .

[0845] The instruction unit 4402 receives the control signal 4401 from the master station 4410-1. The control signal 4401 includes configuration information regarding unicast settings and a method of changing the phase.

[0846] The instruction unit 4402 provides setting information regarding unicast transmission to all APs including the AP 4420 - 1 based on the control signal 4401 .

[0847] Furthermore, the instruction unit 4402 instructs each AP on a method of changing the phase.

[0848] Based on received control signal 4401, instruction unit 4402 generates control signals 4403_0, 4403_1, ..., and 4403_N for each AP. Each control signal includes information regarding unicast transmission and phase change. Instruction unit 4402 outputs control signals 4403_0, 4403_1, ..., and 4403_N to itself, AP 4420-2, AP 4420-3, and AP 4420-4.

[0849] When unicast transmission is to be performed to AP 4420 - 1 , the instruction unit 4402 activates the receiving device 217 .

[0850] 6.3 Non-Master AP4600

[0851] AP4420-2, AP4420-3, and AP4420-4 are non-master APs. AP4420-12, AP4420-13, and AP4420-14 are also non-master APs.

[0852] The operations of AP4420-2, AP4420-3, and AP4420-4 will be described later. At this point, AP4600 will be described to represent AP4420-2, AP4420-3, and AP4420-4.

[0853] Non-master AP4600, such as Figure 46 As shown, it is composed of an encoder 202, an interleaver 204, a mapping unit 206, a phase change unit 208, a wireless unit 210, an antenna 212, an antenna 215 and a receiving device 217.

[0854] AP 4600 receives control signal 4601_0 from AP 4420-1, acting as the master AP. Control signal 4601_0 includes information regarding unicast transmission and phase change. Furthermore, AP 4600 receives data 4602 from AP 4420-1, acting as the master AP (without AP collaboration). Furthermore, when AP collaboration is in place, AP 4600 may receive data 4603 from other APs. Furthermore, AP 4600 may receive data 201 from parent station 4410-1 and may also provide this data to other APs.

[0855] AP 4600, based on control signal 4601_0, sets unicast transmission and a phase change method.

[0856] AP4600, when performing unicast settings, operates the receiving device 217.

[0857] (1) Encoder 202

[0858] Encoder 202 receives data 4602, 4603, or 201 from parent station 4410-1. Furthermore, encoder 202 receives control signal 213 from a controller within AP 4600. Control signal 213 includes information such as the encoding scheme, error correction scheme, coding rate, and block length. Encoder 202 performs error correction encoding on data 4602, 4603, or 201 using the scheme specified by control signal 213, such as convolutional coding, LDPC coding, or turbo coding. Encoder 202 outputs encoded data 203.

[0859] (2) Interleaver 204

[0860] Interleaver 204 receives encoded data 203 from encoder 202. Furthermore, interleaver 204 receives control signal 213 from a controller included in AP 4600. Control signal 213 specifies an interleaving method. Interleaver 204 interleaves, or rearranges the order of, encoded data 203 using the interleaving method specified by control signal 213. Interleaver 204 outputs interleaved data 205.

[0861] (3) Mapping Unit 206

[0862] Mapping unit 206 receives interleaved data 205 from interleaver 204. Mapping unit 206 also receives control signal 213 from a controller included in AP 4600. Control signal 213 specifies a modulation scheme. Based on the modulation scheme specified in control signal 213, mapping unit 206 performs modulation on interleaved data 205 using, for example, QPSK (Quadrature Phase Shift Keying), 16QAM (16Quadrature Amplitude Modulation), or 64QAM (64Quadrature Amplitude Modulation), generating modulated signal 207. Mapping unit 206 outputs modulated signal 207. Other modulation schemes may also be used.

[0863] Furthermore, the mapping unit 206 may perform mapping including a process of changing the phase.

[0864] (4) Phase Changing Unit 208

[0865] Phase changer 208 receives modulated signal 207 from mapping unit 206. Furthermore, phase changer 208 receives control signal 4601_0. Control signal 4601_0 includes a setting for a phase change method. Based on the phase change method setting included in control signal 4601_0, phase changer 208 performs a phase change on modulated signal 207, generating phase-changed signal 209. Phase changer 208 outputs phase-changed signal 209.

[0866] (5) Wireless Unit 210 and Antenna 212

[0867] Radio unit 210 receives phase-changed signal 209 from phase changer 208. Furthermore, radio unit 210 receives control signal 213 from a controller included in AP 4600. Control signal 213 includes instructions for frequency conversion, amplification, and the like. Radio unit 210 performs frequency conversion, amplification, and other processing on phase-changed data 209 to generate transmit data 211. Radio unit 210 outputs generated transmit signal 211 to antenna 212 using a frequency band above 6 GHz, such as millimeter waves, and, for example, a frequency band of 60 GHz.

[0868] The antenna 212 outputs the transmission signal 211 as radio waves.

[0869] (6) Antenna 215 and receiving device 217

[0870] Antenna 215 receives signal 216 output as radio waves from each terminal.

[0871] Receiver 217 receives signal 216 from antenna 215 using a frequency band above 6 GHz, such as millimeter waves, for example, a frequency band of 60 GHz, performs processing such as amplification and frequency conversion, and generates data 218. Receiver 217 outputs data 218 to master station 4410-1 or master station 4410-2.

[0872] Furthermore, antenna 212 and antenna 215 may be the same antenna, but are labeled differently for ease of description.

[0873] 6.4 Example of sent data

[0874] An example of data transmitted by the parent station 4410 - 1 , AP 4420 - 1 , AP 4420 - 2 , AP 4420 - 3 , and AP 4420 - 4 will be described below.

[0875] Here, it is assumed that all APs are set to unicast for transmission.

[0876] (1) On sunny days

[0877] For example, when all AP4420-1, AP4420-2, AP4420-3, and AP4420-4 are set to unicast for transmission, data is sent on a sunny day. Figure 47 Provide explanation.

[0878] (Sending side)

[0879] Mother station 4410-1, such as Figure 47The figure shows that data packets 4701, 4702, 4703, ..., 4706, ... (data packets from the communication device) are received in sequence. Data packets 4701, 4702, 4703, ..., 4706, ... are all unicast data packets. Furthermore, data packets 4701, 4705, ... are generated based on first unicast data, data packets 4702, 4706, ... are generated based on second unicast data. Data packets 4703, ... are generated based on third unicast data, and data packets 4704, ... are generated based on fourth unicast data.

[0880] Mother station 4410-1 sends data packets 4701, 4702, 4703, ..., 4706, ... to AP 4420-1. AP 4420-1 receives data packets 4701, 4702, 4703, ..., 4706, ... in sequence.

[0881] AP 4420-1 sequentially processes data packets 4701, 4705, ... generated based on the first unicast data. AP 4420-1 sequentially transmits data packets 4702, 4706, ... generated based on the second unicast data to AP 4420-2. AP 4420-1 sequentially transmits data packets 4703, ... generated based on the third unicast data to AP 4420-3. AP 4420-1 sequentially transmits data packets 4704, ... generated based on the fourth unicast data to AP 4420-4.

[0882] AP 4420-1 sequentially receives packets 4701, 4705, ..., addressed to it. Upon receiving packets 4701, 4705, ..., AP 4420-1 sequentially outputs packets 4711, 4712, 4713, 4714, ..., via unicast and wireless. Here, packets 4701, 4705, ..., correspond to packets 4711, 4712, 4713, 4714, ..., respectively.

[0883] If AP 4420-2 receives packets 4702, 4706, ... in sequence, it unicasts and wirelessly outputs packets 4721, 4722, 4723, 4724, ... in sequence. Here, packets 4702, 4706, ... correspond to packets 4721, 4722, 4723, 4724, respectively.

[0884] If AP 4420-3 receives packets 4703, ..., in sequence, it unicasts and wirelessly outputs packets 4731, 4732, 4733, 4734, .... Here, packets 4703, ... correspond to packets 4731, 4732, 4733, and 4734, respectively.

[0885] If AP 4420-4 receives packets 4704, ..., in sequence, it unicasts and wirelessly outputs packets 4741, 4742, 4743, 4744, .... Here, packets 4704, ... correspond to packets 4741, 4742, 4743, and 4744, respectively.

[0886] (Receiving side)

[0887] For example, imagine that Figure 44 APs 4420-1, 4420-2, 4420-3, 4420-4, 4420-11, 4420-12, 4420-13, and 4420-14, for example, implement beamforming and have highly directional antennas. In this scenario, it is assumed that AP 4420-1 communicates with AP 4420-11, AP 4420-2 communicates with AP 4420-12, AP 4420-3 communicates with AP 4420-13, and AP 4420-4 communicates with AP 4420-14.

[0888] At this time, the receiving device 217 of AP4420-11 receives the data packet sent by AP4420-1, the receiving device 217 of AP4420-12 receives the data packet sent by AP4420-2, the receiving device 217 of AP4420-13 receives the data packet sent by AP4420-3, and the receiving device 217 of AP4420-14 receives the data packet sent by AP4420-4.

[0889] When 4420-11, 4420-12, 4420-13, and 4420-14 simultaneously receive the modulated signal sent by AP4420-1, the modulated signal sent by AP4420-2, the modulated signal sent by AP4420-3, and the modulated signal sent by AP4420-4, separation processing is performed on the received signal received by 4420-11, the received signal received by 4420-12, the received signal received by 4420-13, and the received signal received by 4420-14 to separate the individual data packets and obtain individual data packets.

[0890] As another example, consider the case where the mother station 4410-1 only receives data packets U1-#X (X=1, 2, 3, ...). In this case, consider the case where, for example, AP 4420-1 sends data packet U1-#X and other APs stop working. This reduces the number of active APs, thereby achieving the effect of reducing power consumption in the system. Furthermore, when it rains, it is assumed that Figure 48 Such sending (for Figure 48 The advantages of this method will be described in detail later.

[0891] In particular, when transmitting modulated signals using millimeter-wave frequencies, rain can significantly attenuate the signal (radio wave). In order to maintain the receiving electric field strength at the other end of the communication, the communication device must transmit the modulated signal at a high average transmit power. However, there are often limits on the average transmit power that each communication device can transmit. Increasing the transmit power to a level that mitigates the effects of rain attenuation does not necessarily mean that the communication device will be able to transmit the modulated signal.

[0892] For such topics, Figure 48 It is shown that by having multiple communication devices transmit modulated signals including the same data, the following effects are achieved: the communication partner can obtain a high reception electric field strength, and each communication device can comply with the limit value for the average transmit power that can be transmitted.

[0893] Furthermore, as described above, by operating in a manner such that “AP 4420 - 1 transmits data packet U1 -#X and other APs stop operating” during sunny days, it is possible to achieve an effect of reducing power consumption of the system during sunny days.

[0894] Therefore, by making the operations of the master station AP different between sunny days and rainy days, it is possible to construct a system having the advantages of ensuring communication quality and being able to appropriately and flexibly change power consumption control.

[0895] hour

[0896] use Figure 48 An example of data transmitted during rainy weather when all of AP4420-1, AP4420-2, AP4420-3, and AP4420-4 are set to unicast for transmission will be described.

[0897] (Sending side)

[0898] Mother station 4410-1, such as Figure 48The figure shows that data packets 4801, 4802, 4803, ..., 4806, ... are received in sequence. Here, data packets 4801, 4802, 4803, ..., 4806, ... are all unicast data packets. Furthermore, data packets 4801, 4802, 4803, ..., 4806, ... are generated based on a single unicast data packet.

[0899] The mother station 4410-1 sends data packets 4801, 4802, 4803, ..., 4806, ... to the AP 4420-1 in sequence.

[0900] AP 4420-1 receives data packets 4801, 4802, 4803, ..., 4806, ..., and processes data packets 4801, 4802, 4803, ..., 4806, ..., in sequence. Furthermore, AP 4420-1, AP 4420-2, AP 4420-3, and AP 4420-4 send data packets 4801, 4802, 4803, ..., 4806, ..., in sequence, respectively.

[0901] AP 4420-1 sequentially receives data packets 4801, 4802, 4803, ..., 4806, .... Upon receiving data packets 4801, 4802, 4803, ..., 4806, ...., AP 4420-1 sequentially outputs data packets 4811, 4812, 4813, 4814, .... in unicast wireless mode. Data packets 4801, 4802, 4803, ..., 4806, .... correspond to data packets 4811, 4812, 4813, and 4814, respectively.

[0902] AP 4420-2 sequentially receives data packets 4801, 4802, 4803, ..., 4806, .... Upon receiving data packets 4801, 4802, 4803, ..., 4806, ...., AP 4420-2, under the control of master AP 4420-1, sequentially outputs data packets 4821, 4822, 4823, 4824, .... in unicast wireless mode. Here, data packets 4801, 4802, 4803, ..., 4806, .... correspond to data packets 4821, 4822, 4823, and 4824, respectively.

[0903] AP 4420-3 sequentially receives data packets 4801, 4802, 4803, ..., 4806, .... Upon receiving data packets 4801, 4802, 4803, ..., 4806, ...., AP 4420-3, under the control of master AP 4420-1, sequentially outputs data packets 4831, 4832, 4833, 4834, .... in unicast wireless mode. Data packets 4801, 4802, 4803, ..., 4806, .... correspond to data packets 4831, 4832, 4833, and 4834, respectively.

[0904] AP 4420-4 sequentially receives data packets 4801, 4802, 4803, ..., 4806, .... Upon receiving data packets 4801, 4802, 4803, ..., 4806, ...., AP 4420-4, under the control of master AP 4420-1, sequentially outputs data packets 4841, 4842, 4843, 4844, .... in unicast wireless mode. Here, data packets 4801, 4802, 4803, ..., 4806, .... correspond to data packets 4841, 4842, 4843, and 4844, respectively.

[0905] Regarding this feature, as described in other embodiments, APs 4420-1, 4420-2, 4420-3, and 4420-4 transmit the same data packet at the same time. (The modulated signals after mapping are the same at the same time.) Therefore, a phase change is performed on AP 4420-1, AP 4420-2, AP 4420-3, and AP 4420-4. (However, it is not necessary for any of APs 4420-1, 4420-2, 4420-3, and 4420-4 to perform a phase change.)

[0906] Moreover, in Figure 48 In the example, there are four APs, and the four APs send data packets U1-#X (X=1, 2, 3, ···). However, this is not limited to this. For example, there may be N (N is an integer greater than 2) APs, and M (M is an integer less than N, and M is an integer greater than 2) APs sending data packets U1-#X (X=1, 2, 3, ···).

[0907] Based on the above, the following configurations can be considered.

[0908] There are N (N is an integer greater than or equal to 2) APs. Furthermore, on sunny days (when radio wave attenuation due to rain is minimal (even if it is raining, radio wave attenuation is minimal, so it is considered "sunny")), L (L is an integer greater than or equal to 1 and less than or equal to N-1) APs transmit data packets U1-#X (X=1, 2, 3, ...).

[0909] Moreover, when it rains (when the attenuation of radio waves caused by rain is large), M (M is an integer less than N, an integer greater than M2, and ML is a large integer) APs can also send data packets U1-#X (X=1, 2, 3,...).

[0910] By transmitting in this manner, as described above, it is possible to suppress the degradation of reception quality at the communicating party caused by propagation attenuation during rain, thereby constructing a system that maintains communication quality and allows for appropriate and flexible control of power consumption. Furthermore, on sunny days, an AP that did not transmit packet U1-#X can transmit other packets (or not transmit other packets). Similarly, on rainy days, an AP that did not transmit packet U1-#X can transmit other packets (or not transmit other packets).

[0911] (Receiving side)

[0912] AP4420-11's receiver 217 simultaneously receives the modulated signals corresponding to data packet 4811, data packet 4821, data packet 4831, and data packet 4841. Next, AP4420-11's receiver 217 simultaneously receives the modulated signals corresponding to data packet 4812, data packet 4822, data packet 4832, and data packet 4842. Next, AP4420-11's receiver 217 simultaneously receives the modulated signals corresponding to data packet 4813, data packet 4823, data packet 4833, and data packet 4843. Next, AP4420-11's receiver 217 simultaneously receives the modulated signals corresponding to data packet 4814, data packet 4824, data packet 4834, and data packet 4844. The same applies to the following.

[0913] Therefore, the synthesized received signal is demodulated and decoded, thereby obtaining data packets 4801, 4802, 4803, 4804, 4805, etc.

[0914] 6.5 Working as the Master AP

[0915] For AP4420-1 to work as the main AP, use Figure 49 The flowchart shown is used for explanation.

[0916] The instruction unit 4402 of the master AP 4420-1 obtains the communication quality with the communication partner AP 4420-11 (step S4901). The instruction unit 4402 then determines whether the obtained communication quality is equal to or greater than a threshold value (step S4902).

[0917] If the acquired communication quality is less than the threshold ("less than threshold" in step S4902), the instruction unit 4402 causes AP4420-2, AP4420-3, and AP4420-4 to coordinate and transmit the same data (step S4903). The process then returns to step S4901 and repeats.

[0918] If the acquired communication quality is above the threshold ("above the threshold" in step S4902), the instruction unit 4402, for example, causes APs 4420-2, 4420-3, and 4420-4 to stop the coordinated operation (stop transmitting the same data) (step S4904). The instruction unit 4402, for example, causes APs 4420-2, 4420-3, and 4420-4 to resume independent operation. Independent operation refers to the operation before the coordinated operation was started (step S4905). The process then returns to step S4901 and repeats.

[0919] 6.6 Transmission of Training Signals by Each AP

[0920] AP 4420-1 transmits, for example, training signals in both sunny and rainy conditions. The communicating party receives the training signals and transmits the reception result to AP 4420-1. AP 4420-1 obtains this reception result to determine the communication quality with the receiving AP. Based on the obtained communication quality, AP 4420-1 determines whether to proceed with or discontinue the coordination process. AP 4420-1 then transmits the "proceed or discontinue coordination" result to APs 4420-2, 4420-3, and 4420-4. (At this time, AP4420-1 can also send the result of "perform coordination work or stop coordination work" via the mother station, or can send the result of "perform coordination work or stop coordination work" directly to AP4420-2, 4420-3, 4420-4.) In addition, when AP4420-1 determines that "perform coordination work", it sends information about the method, modulation method, and coding method of the phase change value used to AP4420-2, 4420-3, and 4420-4 (At this time, AP4420-1 can also send information about the method, modulation method, and coding method of the phase change value used to AP4420-2, 4420-3, and 4420-4 via the mother station).

[0921] Moreover, in the case of this embodiment, the mode set to "multicast" may not exist (for example, when this embodiment is applied to a communication device installed in a building (structure) and a communication device installed in a building (structure), there may be a situation where multicast is not required).

[0922] Furthermore, in the above description, the case where the master AP and the non-master AP perform coordination is described as an example, but as also described in other embodiments, Figure 1 as well as Figure 25 As shown in FIG, the coordination work when the mother station has part of the function of the master AP will be as Figure 47 The frame structure and Figure 48 The frame skeleton structure can be switched between sunny and rainy days, thereby enabling the same operation as described above. Moreover, the structure of the transmission system that switches between sunny and rainy days to coordinate operation is not limited to this. In this case, the function of "switching between sunny and rainy days to coordinate operation" as described above is important.

[0923] 6.4 Summary

[0924] This aspect enables high-capacity transmission at Gbps. Furthermore, wireless communication is ensured even in rainy conditions. Furthermore, when the weather returns from rainy to sunny, the master AP stops coordination operations. This reduces unnecessary power consumption caused by coordination operations during sunny conditions.

[0925] Furthermore, in the embodiment described above, four APs perform coordination work. However, the present invention is not limited thereto and more than two APs may also perform coordination work.

[0926] "Replenish"

[0927] Of course, it is also possible to implement combinations of multiple embodiments and other contents described in this specification.

[0928] Furthermore, the various embodiments and other contents are merely examples. For example, even if an example of "modulation method, error (loss) correction coding method (error correction code used, code length, coding rate, etc.), control information, etc." is shown, it can be executed with the same structure when other "modulation method, error (loss) correction coding method (error correction code used, code length, coding rate, etc.), control information, etc." are applied.

[0929] Regarding the modulation method, even if a modulation method other than the modulation method described in this specification is used, the embodiments described in this specification and other contents can be executed. For example, APSK (Amplitude Phase Shift Keying) (for example, 16APSK, 64APSK, 128APSK, 256APSK, 1024APSK, 4096APSK, etc.), PAM (Pulse Amplitude Modulation) (for example, 4PAM, 8PAM, 16PAM, 64PAM, 128PAM, 256PAM, 1024PAM, 4096PAM, etc.), PSK (Phase Shift Keying) (for example, BPSK, QPSK, 8PSK, 16PSK, 64PSK, 128PSK, 256PSK, 1024PSK, 4096PSK, etc.), QAM (Quadrature Amplitude Modulation) (for example, 4PAM, 8PAM, 16PAM, 64PAM, 128PSK, 256PSK, 1024PSK, 4096PSK, etc.) Modulation) (for example, 4QAM, 8QAM, 16QAM, 64QAM, 128QAM, 256QAM, 1024QAM, 4096QAM, etc.), etc., and uniform mapping or non-uniform mapping can also be set in each modulation method.

[0930] Furthermore, the transmission method for wireless communication may be a transmission method in which a transmitting device has one antenna and a receiving device has more than one antenna to receive a signal (SISO (Single-Input Single-Output) transmission method, SIMO (Single-Input Multiple-Output) transmission method). Alternatively, a method in which a transmitting device transmits multiple streams and a receiving device receives a modulated signal using more than one antenna (MIMO (Multiple-Input Multiple-Output) transmission method, MISO (Multiple-Input Single-Output) transmission method). Furthermore, space-time block codes and space-time trellis codes may be utilized (in this case, when utilizing a multi-carrier method such as OFDM, symbols may be arranged in the time axis direction, in the frequency axis direction, or in the frequency-time axis direction).

[0931] Furthermore, when described as "complex number" in this specification, it means "defined as a complex number", and there may be cases where the imaginary number component becomes zero and becomes a real number.

[0932] The present disclosure is not limited to the contents described in the above embodiments, and can be implemented in any form for achieving the purpose of the present disclosure and its related or incidental purposes. For example, it can be implemented as follows.

[0933] (1) The operating procedures of the communication device on the communication station side described in each of the above embodiments may be recorded in a program, and this program may be stored in a ROM (Read Only Memory) in advance, with the CPU (Central Processing Unit) reading and executing the program stored in the ROM. Alternatively, the program recording the operating procedures of the communication device on the communication station side may be stored in a computer-readable storage medium, and the program stored in the storage medium may be stored in a computer's RAM (Random Access Memory), with the CPU of the computer reading and executing the program stored in the RAM.

[0934] (2) Each structure of each embodiment can also be implemented as a typical integrated circuit LSI (Large Scale Integration). They can be integrated into a single chip or a single chip can be integrated into a single chip that includes all or part of the structure of each embodiment.

[0935] Here, LSI may be called IC (Integrated Circuit), system LSI, super LSI, or ultra LSI depending on the degree of integration.

[0936] Furthermore, the method of integrated circuit formation is not limited to LSIs; implementation as a dedicated circuit or a general-purpose processor is also possible. FPGAs (Field Programmable Gate Arrays) that can be programmed after LSI fabrication, or reconfigurable processors that can reconfigure the connections and settings of circuit cells within the LSI, are also possible.

[0937] Furthermore, if semiconductor technology advances or other derived technologies lead to the emergence of integrated circuit technology that replaces LSI, it will naturally be possible to integrate functional blocks using this technology. There is also the possibility of adapting biotechnology.

[0938] In this specification, transmission devices may include, for example, communication and broadcasting equipment such as broadcast stations, base stations, access points, terminals, and mobile phones. In this case, reception devices may include communication equipment such as televisions, radios, terminals, personal computers, mobile phones, access points, and base stations. Furthermore, the transmission and reception devices of the present disclosure may be devices with communication capabilities that can be connected to devices for executing applications such as televisions, radios, personal computers, and mobile phones via some kind of interface.

[0939] Furthermore, in this embodiment, any symbols other than data symbols, such as pilot symbols (preamble, unique word, postamble, reference symbols, etc.) and control information symbols, may be arranged in the frame. Furthermore, although these symbols are referred to as pilot symbols or control information symbols, any naming method may be used; the function itself is what is important.

[0940] The pilot symbol is, for example, a known symbol after PSK modulation used in a transceiver (or, the receiver is synchronized so that the receiver can know the symbol sent by the transmitter). The receiver uses this symbol to perform frequency synchronization, time synchronization, channel estimation (CSI (Channel State Information) estimation) (for each modulated signal), signal detection, etc.

[0941] Furthermore, the symbols used for control information are symbols used to implement communications other than data (applications, etc.) and to transmit information that needs to be transmitted to the communication partner (for example, the modulation method used in the communication, the error (loss) correction coding method, the coding rate of the error (loss) correction coding method, upper layer setting information, etc.).

[0942] The transmission method (MIMO, SISO, space-time block coding, interleaving), modulation method, error correction coding method, and packet-level error (loss) correction method must be notified to the transmitter and receiver, but this information may be omitted depending on the embodiment. Furthermore, the symbols that transmit these symbols are included in the frames sent by the transmitter, and the receiver obtains these symbols to adjust its operation.

[0943] Furthermore, the present disclosure is not limited to the respective embodiments and can be implemented with various modifications. For example, in the respective embodiments, the communication method is described as a communication device, but the present disclosure is not limited thereto and the communication method can also be implemented as software.

[0944] The transmission method disclosed herein can be used in multiple transmission devices to perform wireless transmission using the millimeter wave frequency band, and is a technology useful for wireless communication.

[0945] Explanation of symbols

[0946] 110 Mother Station

[0947] 121 to 124AP

[0948] Terminals 131 to 138

[0949] 202 Encoder

[0950] 204 Interleaver

[0951] 206 Mapping Department

[0952] 208 Phase Changing Unit

[0953] 210 Wireless Department

[0954] 212 Antenna

[0955] 215 Antenna

[0956] 217 Receiving Device

[0957] 302 Transmission Data Distribution Unit

[0958] 305 Received Data Distribution Unit

[0959] 308 Instruction Department

[0960] 100, 1400, 1500, 1600 wireless communication systems

[0961] 1800, 2500, 3400, 4400 wireless communication systems

Claims

1. A transmission method implemented by a transmission system for wirelessly transmitting to a receiving device, characterized in that: The sending system includes a first sending device that sends data to the receiving device in both cases of a coordinated operation and a case where a coordinated operation is not performed, and a second sending device that sends data to the receiving device in the case of a coordinated operation, and data is sent from the first sending device to the receiving device. In the sending method, acquiring communication quality information indicating the communication quality with the receiving device, Based on the communication quality information, it is determined whether to perform a coordination operation in which the first transmitting device and the second transmitting device coordinately transmit data to the receiving device. When it is determined that the cooperation operation is to be performed, the second transmitting device transmits data to the receiving device through cooperation with the first transmitting device. If it is determined that the cooperation operation is not to be performed, the second transmitting device stops transmitting data based on the cooperation operation with the first transmitting device. One of the first transmitting device and the second transmitting device instructs the other transmitting device to start and stop the coordination operation. The receiving device is included in a receiving system including a second receiving device, The second transmitting device transmits, to the second receiving device, data different from the data transmitted by the first transmitting device among the data transmitted to the receiving system without performing the coordination operation.

2. The sending method according to claim 1, wherein: In the cooperative operation, the first transmitting device and the second transmitting device transmit the same data at the same time.

3. The sending method according to claim 1, wherein: The first transmitting device, the second transmitting device, and the receiving device are fixedly installed.

4. A control device used in a transmission system for wirelessly transmitting to a receiving device, characterized in that: The transmission system includes a first transmission device that transmits data to the receiving device in both cases of a coordinated operation and a case where a coordinated operation is not performed, and a second transmission device that transmits data to the receiving device in the case of a coordinated operation. The control device comprises: a transceiver unit for communicating with the first transmitting device and the second transmitting device; and control unit, In the control unit, obtaining communication quality information indicating the communication quality between the first transmitting device and the receiving device, and determining, based on the communication quality information, whether to coordinate the first transmitting device and the second transmitting device to transmit data to the receiving device in a coordinated manner, If it is determined that the cooperation operation is to be performed, an instruction is issued to the second transmitting device to transmit data to the receiving device through cooperation with the first transmitting device. If it is determined that the cooperation operation is not to be performed, an instruction is issued to the second transmitting device to stop data transmission based on the cooperation operation with the first transmitting device. One of the first transmitting device and the second transmitting device instructs the other transmitting device to start and stop the coordination operation. The receiving device is included in a receiving system including a second receiving device, The second transmitting device transmits, to the second receiving device, data different from the data transmitted by the first transmitting device among the data transmitted to the receiving system without performing the coordination operation.

5. A transmission system that transmits data to a receiving device wirelessly, comprising a first transmission device that transmits data to the receiving device both when a coordinated operation is performed and when a coordinated operation is not performed, and a second transmission device that transmits data to the receiving device when a coordinated operation is performed, characterized in that: include: a receiving unit configured to obtain communication quality information indicating a communication quality between the first transmitting device and the receiving device; as well as Control Department, In the control unit, Based on the communication quality information, it is determined whether to perform a coordination operation in which the first transmitting device and the second transmitting device coordinately transmit data to the receiving device. If it is determined that the cooperation operation is to be performed, the second transmitting device is caused to transmit data to the receiving device through cooperation with the first transmitting device. If it is determined that the cooperation operation is not to be performed, the second transmitting device is caused to stop data transmission based on the cooperation operation with the first transmitting device. One of the first transmitting device and the second transmitting device instructs the other transmitting device to start and stop the coordination operation. The receiving device is included in a receiving system including a second receiving device, The second transmitting device transmits, to the second receiving device, data different from the data transmitted by the first transmitting device among the data transmitted to the receiving system without performing the coordination operation.

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