JP2014158106A - Radio communication system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve radio communication quality in radio communication by beam forming and to prevent communication interruption.SOLUTION: A radio communication method includes: a transmission step for transmitting a transmission wave having an adjusted transmission direction on the basis of beam forming from a transmission-side device 2; and a reception step for receiving the transmission wave transmitted from the transmission-side device 2 in a manner to fit to a reception direction corresponding to the transmission direction. Before starting the transmission step and the reception step, propagation information related to the transmission direction of the transmission wave is transmitted, as a transmission wave, from the transmission-side device 2 by being included in a data frame preamble or a physical layer header. A reception-side device 3 receives the transmission wave, and fits the reception direction in the reception step to the transmission direction, on the basis of the propagation information included in the data frame.

Description

  The present invention relates to a wireless communication system and method for performing wireless communication based on beamforming between a plurality of devices.

  Conventionally, techniques for performing wireless communication performed between a plurality of devices based on beamforming have been proposed. Wireless communication based on this beamforming is used in, for example, a wireless personal area network (IEEE 802.15.3c WPAN) and a wireless LAN (IEEE 802.11ad WLAN).

  In particular, when performing wireless communication based on IEEE 802.11, the communication quality is easily affected by surrounding conditions such as multipath as the communication speed increases. In the existing communication method, the propagation path fluctuates particularly due to the influence of multipath and the like, and sufficient wireless communication quality cannot be ensured. For this reason, it is necessary to perform wireless communication with better and more stable communication quality than conventional wireless LANs, and there is a beam forming technique as one of the techniques for solving this. By using this beam forming technique, it is possible to establish a higher-quality wireless communication link even in an environment where a propagation path fluctuates due to multipath or the like and sufficient wireless communication quality cannot be ensured.

  The beam forming technology uses the property of radio waves that strengthen each other when the radio waves transmitted are in the same phase and cancel each other when the radio waves are in opposite phases. As shown in FIG. 15, when wireless communication is performed between the device 71 and the device 72, the transmitting device 71 is equipped with a plurality of antennas at the position of the receiver, and the receiving device 72 has stronger radio waves. The power and phase transmitted from each antenna are controlled so that they can meet each other. As a result, it is possible to improve communication quality in the device 72 on the receiving side. For this reason, it is possible to improve the communication quality on the receiving side even when the propagation path changes due to reflection, scattering, and diffraction of radio waves on a building or the like as in a multipath. At this time, when the transmission-side device 71 transmits a transmission wave in the direction of Beam # 1 shown in FIG. 15, the reception-side device 72 also adjusts the reception direction to the direction of Beam # 1. Communication quality can be improved. Similarly, when the transmitting device 71 transmits a transmission wave in the direction of Beam # 2, the receiving device 72 also improves the communication quality by matching the receiving direction to the direction of Beam # 2. Can be achieved.

  In order to actually perform wireless communication by beam forming, it is necessary to perform so-called adaptive control in which the transmission direction and the reception direction are matched between the transmission-side device 71 and the reception-side device 72. In this adaptive control, feedback from the receiving direction device 72 such as the receiving direction (Beam # 1, Beam # 2, Beam # 3) and the information on the amplitude and phase of the received signal are fed back and transmitted. The side device 71 determines the transmission direction (Beam # 1, Beam # 2, Beam # 3) based on the feedback information, and transmits the transmission wave.

  In the case of performing such adaptive control, as shown in FIG. 15, first, from the device 71 side on the transmission side, in its MAC (Media Access Layer) frame following the preamble and physical layer (PHY) header, its own transmission is performed. Describe propagation path information such as direction (Beam # 1, Beam # 2, Beam # 3), and information on the amplitude and phase of the transmission signal as (TX Beam # 1, TX Beam # 2, TX Beam # 3) Send to device 72. In response to this, the device 72 transmits an ACK packet to the device 71. Further, as shown in FIG. 16, the device 72 transmits propagation path information such as its own reception direction (Beam # 1, Beam # 2, Beam # 3), and information on the amplitude and phase of the transmission signal in the MAC frame (TX Beam # 1, TX Beam # 2, TX Beam # 3) and return to device 71. The device 71 that has received this can determine the reception direction of the device 72 based on the propagation path information described in the MAC frame. Then, the device 71 matches the transmission direction of the transmission wave with the reception direction of the device 72 and transmits this. As a result, a communication link by beam forming can be established between the devices 71 and 72.

JP 2010-171645 A JP 2010-171651 A

  However, it is necessary to perform adaptive control such as communication beam search and communication beam tracking described above. When performing such adaptive control, communication must be temporarily interrupted, and it is necessary to wait until these adaptive control processes are completed. Further, in the existing adaptive control by beam forming, as shown in FIG. 17, in the protocol stack including the physical layer (PHY) and the MAC layer, the propagation path information and the like are described in the MAC layer. When this is transmitted / received, it is converted into a MAC frame. Since this MAC layer forms a protocol higher than the physical layer, it takes a long time to write and read propagation path information and the like to the MAC layer. There is a problem in that this long standby causes a decrease in communication quality.

  Therefore, the present invention has been devised in view of the above-described problems, and an object of the present invention is to provide a radio communication system and method for performing radio communication between a plurality of devices based on beam forming. An object of the present invention is to provide a wireless communication system and method capable of improving wireless communication quality and preventing communication interruption by performing adaptive control necessary for forming at higher speed.

  A radio communication system to which the present invention is applied is a radio communication system in which radio communication is performed between a plurality of devices based on beamforming. Each of the devices includes a transmission unit capable of transmitting a transmission wave in a different transmission direction, and a partner. Receiving means for receiving a transmission wave transmitted from the transmission side in accordance with a reception direction corresponding to the transmission direction, and a device on the transmission side transmits propagation path information regarding the transmission direction of the transmission wave to a preamble of a data frame. Alternatively, it is included in the physical layer header and transmitted as the transmission wave, and the device on the receiving side receives the transmission wave, and receives the reception direction information regarding the reception direction in the receiving means in the preamble of the data frame or in the physical layer. Include it in the header and send it back to the sending device, and send back the data frame from the receiving device. Only, based on the received direction information included in this, and transmits the transmission wave to fit the transmission direction to the reception direction of the device of the transmission side.

  A radio communication system to which the present invention is applied is a radio communication system in which radio communication is performed between a plurality of devices based on beamforming. Each of the devices includes a transmission unit capable of transmitting a transmission wave in a different transmission direction, and a partner. Receiving means for receiving a transmission wave transmitted from the transmission side in accordance with a reception direction corresponding to the transmission direction, and a device on the transmission side transmits propagation path information regarding the transmission direction of the transmission wave to a preamble of a data frame. Or, it is included in the header of the physical layer and transmitted as the transmission wave, and the device on the receiving side receives the transmission wave, and based on the propagation path information included in the data frame, The reception direction is matched with the transmission direction.

  A radio communication method to which the present invention is applied is a radio communication method in which radio communication is performed between a plurality of devices based on beamforming, and a transmission wave whose transmission direction is adjusted based on beamforming is transmitted from a device on the transmission side. A transmission step and a reception step in which a reception device receives a transmission wave transmitted from the transmission device in a reception direction corresponding to the transmission direction, and starts the transmission step and the reception step. Before, from the device on the transmission side, the propagation path information related to the transmission direction of the transmission wave is included in the preamble of the data frame or the header of the physical layer, and this is transmitted as the transmission wave. Receives a transmission wave, and receives reception direction information about its own reception direction into the preamble of the data frame or the physical layer. In response to the data frame from the receiving device, and based on the receiving direction information included in the data frame, the receiving device receives the data frame. The transmission wave is transmitted by adjusting the transmission direction to the direction.

  A radio communication method to which the present invention is applied is a radio communication method in which radio communication is performed between a plurality of devices based on beamforming, and a transmission wave whose transmission direction is adjusted based on beamforming is transmitted from a device on the transmission side. A transmission step and a reception step in which a reception device receives a transmission wave transmitted from the transmission device in a reception direction corresponding to the transmission direction, and starts the transmission step and the reception step. Before, from the device on the transmission side, the propagation path information regarding the transmission direction of the transmission wave is included in the preamble of the data frame or the header of the physical layer, and this is transmitted as the transmission wave. Receive a transmission wave and receive in the reception step based on propagation path information included in the data frame Countercurrent, characterized in that to adapt to the transmission direction.

  In the present invention, the transmission step of transmitting a transmission wave whose transmission direction is adjusted based on beamforming from the transmission-side device, and the transmission wave transmitted from the transmission-side device are matched with the reception direction corresponding to the transmission direction. A receiving step for receiving is executed. Before starting these steps, from the device on the transmission side, the propagation path information regarding the transmission direction of the transmission wave is included in the preamble of the data frame or the header of the physical layer, and this is transmitted as the transmission wave. The device receives the transmission wave, includes the reception direction information regarding the reception direction in the preamble of the data frame or the header of the physical layer, and returns it to the transmission side device. In addition, the transmission-side device receives a data frame response from the reception-side device, and based on the reception direction information included in the preamble of the data frame or the physical layer header, the transmission-side device sets the reception direction in the reception-side device. The transmission wave is transmitted according to the transmission direction. As a result, a communication link based on beamforming can be established. In addition, in the present invention, in the protocol stack including the physical layer (PHY) and the MAC layer, the propagation path information and the reception direction information and the like are described not in the MAC layer but in the physical layer (PHY). As a result, it is not necessary to read / write information to the MAC layer located above the physical layer, and these wireless communication links can be established by reading / writing information from a lower physical layer. As a result, propagation path information and the like can be written and read out in a shorter period of time, which eliminates the need for a long standby time, enables uninterrupted wireless communication, and consequently improves communication quality. Is possible.

It is a block diagram of the radio | wireless communications system to which this invention is applied. It is a flowchart of operation | movement of the radio | wireless communication by a radio | wireless communications system. It is a figure for demonstrating the protocol stack introduced by the adaptive control in this invention. It is a figure for demonstrating the example of the data frame which the device of a transmission side includes in a transmission wave. It is a figure which shows the example of the data frame which the device of the receiving side returns. It is a figure for demonstrating the case where propagation path information etc. are inserted in the preamble of a data frame. It is another figure for demonstrating the case where propagation path information etc. are inserted in the preamble of a data frame. It is a figure which shows the example which describes the transmission direction of the transmission wave in own beamforming to the preamble of a data frame as propagation path information. It is a figure which shows the detailed structure of the preamble in a data frame. It is a figure for demonstrating the example which inserts propagation path information etc. in a data frame by a Golay code | symbol. It is a figure which shows the example which expresses propagation path information etc. with a concrete Golay sequence. It is a figure which shows the example which performs step S11 based on a Golay sequence. It is a figure which shows the example which performs step S13 based on a Golay sequence. It is a figure which shows the example which performs step S14 based on a Golay sequence. It is a figure for demonstrating the radio | wireless communication based on the conventional beam forming. It is another figure for demonstrating the radio | wireless communication based on the conventional beam forming. It is a figure for demonstrating the protocol stack used by the radio | wireless communication based on the conventional beam forming.

  Hereinafter, a wireless communication system to which the present invention is applied will be described in detail with reference to the drawings.

  A wireless communication system to which the present invention is applied is applied to a wireless personal area network (IEEE 802.15.3c WPAN), a wireless LAN (IEEE 802.11ad WLAN), and the like.

  FIG. 1 shows a configuration of a wireless communication system 1 to which the present invention is applied. This wireless communication system 1 establishes a mutual communication link based on beam forming using the property of radio waves that mutually strengthen radio waves transmitted in the same phase and cancel each other if they are in opposite phases. .

  The wireless communication system 1 includes a plurality of devices 2 and 3. The device 2 includes a communication control unit 21 and antennas 22a, 22b, and 22c. The device 3 includes a communication control unit 31 and antennas 32a, 32b, and 32c.

  When transmitting a transmission wave, the communication control units 21 and 31 play a role of generating a data frame constituting the transmission wave. When receiving a transmission wave, the communication control units 21 and 31 perform a process of reading the data frame included therein. The communication control units 21 and 31 perform processing for including information necessary for performing other beam forming in the data frame. In addition, the communication control units 21 and 31 read information necessary for performing beam forming included in the data frame, and perform processing for controlling communication by beam forming based on the read information.

  The antennas 22a to 22c and 32a to 32c may form a single antenna element, and may be embodied as an antenna array as an aggregate of the plurality of single antenna elements. Various antennas can be used as the antennas 22a to 22c and 32a to 32c. For example, a sectorized antenna, a switching antenna, or the like can be used other than the above-described antenna element alone. Moreover, when implementing with an antenna array, you may make it use not only a one-dimensional beam forming antenna array but a two-dimensional beam forming antenna array.

  Such antennas 22a to 22c and 32a to 32c are configured to be able to transmit transmission waves in different directions. In addition, the antennas 22a to 22c and 32a to 32c can receive transmission waves from the other side transmitted from different directions. Incidentally, the number of the antennas 22a to 22c and 32a to 32c is not limited to three, and any number may be used as long as it is two or more.

  The antenna 22a and the antenna 32a can transmit and receive the transmission wave Beam # 1 having the same directivity (direction). The antenna 22b and the antenna 32b can transmit and receive the transmission wave Beam # 2 having the same directivity (direction). The antenna 22c and the antenna 32c can transmit and receive the transmission wave Beam # 3 having the same directivity (direction).

  Next, the operation of wireless communication by the wireless communication system 1 having the above-described configuration will be described.

  In the present invention, wireless communication is performed between the devices 2 and 3 based on the beamforming technique. At this time, when data is transmitted from the device 2 to the device 3, the device 2 on the transmission side transmits the transmission wave in the direction of Beam # n (n = 1 to 3). Communication quality can be improved by matching the reception direction with the direction of Beam # n in the device 3. As a result, it is possible to improve communication quality on the receiving side even when the propagation path changes due to reflection, scattering, and diffraction of radio waves on a building or the like as in a multipath.

  In order to perform wireless communication by beam forming, it is necessary to perform so-called adaptive control in which the transmission device 2 and the reception device 3 are matched to each other in the transmission direction and the reception direction. In this adaptive control, feedback from the channel information received from the device 3 on the receiving side (Beam # 1, Beam # 2, Beam # 3), etc., and information related to the amplitude and phase of the received signal are fed back and transmitted. The device 2 on the side determines the transmission direction (Beam # 1, Beam # 2, Beam # 3) based on the feedback information and transmits the transmission wave.

  FIG. 2 is a flowchart of the operation of wireless communication by the wireless communication system 1. First, in step S11, a transmission wave for adaptive control is transmitted from the device 2 on the transmission side to the device 3 on the reception side. In this adaptive control, as shown in FIG. 3, in the protocol stack composed of the physical layer (PHY) and MAC layer, the propagation path information and the like are described in the physical layer (PHY) from the device 2 side on the transmission side. Specifically, as shown in FIG. 4, in the data frame included in the transmission wave, as shown in FIG. 4, propagation path information such as its own transmission direction (Beam # 1, Beam # 2, Beam # 3), Information related to the amplitude and phase of the transmission signal is described as (TX Beam # 1, TX Beam # 2, TX Beam # 3) and transmitted to the device 3. At this time, the device 2 may describe the propagation path information and the like for the physical layer header (PHY header) constituting the data frame.

  In response to this, the device 3 transmits an ACK packet to the device 71 (step S12). Further, as shown in FIG. 5, the device 3 stores propagation path information such as its own receiving direction (Beam # 1, Beam # 2, Beam # 3), and information on the amplitude and phase of the transmission signal in the physical layer (TX Beam # 1, TX Beam # 2, TX Beam # 3) and return to device 2. At this time, the device 3 may describe the propagation path information and the like for the physical layer header (PHY header) constituting the data frame. The device 2 that has received this can determine the receiving direction of the device 3 based on the propagation path information described in the physical layer. The device 2 matches the transmission direction of the transmission wave with the reception direction of the device 3 and transmits it. As a result, a communication link by beam forming can be established between the devices 2 and 3 (step S14).

  In the embodiment described above, for example, as shown in FIG. 6, when the device 2 describes propagation path information or the like in the physical layer, it inserts it into the preamble of the data frame instead of inserting it into the PHY header. You may make it do. Similarly, as illustrated in FIG. 7, when describing the propagation path information or the like in the physical layer, the device 3 may insert the information into the preamble of the data frame instead of inserting it into the PHY header.

  As described above, according to the present invention, the transmission step of transmitting a transmission wave whose transmission direction is adjusted based on beamforming from the transmission-side device 2 and the transmission wave transmitted from the transmission-side device 2 correspond to the transmission direction. A reception step of receiving in accordance with the reception direction is executed via step S14. Before starting step S14, the processes of steps S11 to S13 are executed. From the device 2 on the transmission side, the propagation path information regarding the transmission direction of the transmission wave is obtained from the preamble of the data frame or the physical layer. The device 3 on the receiving side receives the transmission wave and includes the reception direction information on the reception direction in the reception unit in the preamble of the data frame or the header of the physical layer, which is included in the header and transmitted as a transmission wave (step S11). To the transmission side device 2 (step S12). The transmission side device 2 receives the reply of the data frame from the device 3, and is included in the preamble of the data frame or the header of the physical layer. Based on the reception direction information, the transmission wave is matched with the reception direction in the device 3 on the transmission side. To send. As a result, a communication link based on beamforming can be established. In addition, in the present invention, in the protocol stack including the physical layer (PHY) and the MAC layer, the propagation path information and the reception direction information and the like are described not in the MAC layer but in the physical layer (PHY). As a result, it is not necessary to read / write information to the MAC layer located above the physical layer, and these wireless communication links can be established by reading / writing information from a lower physical layer. As a result, propagation path information and the like can be written and read out in a shorter time, and as a result, standby for a long time is unnecessary, enabling uninterrupted wireless communication, thereby improving communication quality. Is possible.

  In particular, according to the present invention, it is useful when performing so-called high-speed beamforming for securing a wireless communication link at high speed, and in a communication environment in which the wireless communication environment changes frequently or in an environment where it is difficult to secure a wireless communication link. It is possible to exert a more advantageous effect.

  In the above example, the case where the transmitting side is the device 2 and the receiving side is the device 3 has been described as an example. However, the same applies to the case where the transmitting side is the device 3 and the receiving side is the device 2. is there.

  Further, the present invention is not limited to the above-described embodiment. For example, the transmission side device 2 includes propagation path information related to the transmission direction of the transmission wave in the preamble of the data frame or the header of the physical layer, and transmits this as a transmission wave. The reception side device 3 transmits the transmission wave. Based on the propagation path information included in the data frame, the reception direction in the reception step may be controlled to match the transmission direction. That is, the receiving device 3 performs adaptive control by beam forming with the transmitting device 2. In such a case, it is needless to say that the same effect as described above can be obtained.

  An embodiment in which the above-described propagation path information or the like is inserted in the preamble of the data frame will be described below.

  First, as shown in FIG. 8A, the transmitting-side device 2 describes the transmission direction of the transmission wave in its beamforming as propagation path information in the preamble of the data frame. In the example of FIG. 8A, the device 2 inserts propagation path information regarding its transmission direction (TX Beam # 2) into the preamble.

  The device 3 that has received such a data frame inserts TX Beam # 3 into the preamble as information regarding the current reception direction as shown in FIG.

  The device 2 receives such a data frame from the device 3 and can identify that the receiving direction in the partner device 3 is Beam # 3. It is also possible to identify that it does not match the current transmission direction Beam # 2.

  Next, the device 2 adjusts its transmission direction to match the reception direction Beam # 3 of the device 3, and the data frame preamble itself includes propagation path information as shown in FIG. 8C. This is described to clearly indicate that the transmission direction is Beam # 3. The device 3 that has received such a data frame can determine that the transmission direction Beam # 3 by the device 2 coincides with its own reception direction Beam # 3. As a result, a communication link by beam forming in which the transmission direction and the reception direction coincide with each other can be established between the devices 2 and 3.

In the present invention, the propagation path information and the reception direction information may be inserted into the data frame based on the Golay code. In the present invention, a Golay code having a length of 128 is inserted into a preamble or a physical layer (PHY) header. FIG. 9 shows a detailed configuration of the preamble 5 in the data frame. The preamble 5 includes a SYNC 51 and a CES 52. SYNC 51 is a so-called synchronization sequence field, and CES 52 is a channel estimation sequence field. In the present invention, a Golay code is inserted into the CES 52. Here, a sample of Golay sequence a ₁₂₈ having a length of _{128 and} a pair of Golay sequence b ₁₂₈ that is complementary to the sample can be expressed in hexadecimal notation as follows.

  Here, the least significant byte is on the left and the most significant byte is on the right.

  Actually, when the Golay code is included in the CES 52, it is divided into a TX Beam Golay Sequence 61 and an RX Beam Golay Sequence 62 as shown in FIG. This TX Beam Golay Sequence 61 describes its own propagation path information. The RX Beam Golay Sequence 62 describes the other party's propagation path information.

  The length of the CES 52 can be changed by the number of n in Beam # n. If the number of n in Beam # n is large, CES 52 is set to be long, and if the number of n in Beam # n is small, CES 52 is set to be short.

FIG. 11 shows an example of a Golay sequence in Beam # 1 to Beam # 8. Beam # 1 to Beam # 8 may be displayed in a pattern made up of Golay sequences a ₁₂₈ and b ₁₂₈ as shown in FIG. 11, for example. These sequences are assumed to be already known to the devices 2 and 3 before the start of communication. At this time, these sequences can be realized by exchanging information such as Capability when actually configuring a network between the devices 2 and 3. In this way, when the propagation path information and the reception direction information are Golay-encoded, as shown in FIG. A Golay code corresponding to any one of Beam # 1 to Beam # 8 is inserted. A random Golay code is inserted into the RX Beam Golay Sequence 62 from codes not used for the beam directivity. In the example of FIG. 12, a Golay code corresponding to Beam # 2 is inserted into the CES 52. Receiving this, the device 3 can determine that the transmission direction of the device 2 is Beam # 2 by decoding the Golay code. The device 3 also determines that its reception direction is Beam # 7.

  Next, the device 3 inserts a Golay code corresponding to any of Beam # 1 to Beam # 8 indicating its own communication direction into the TX Beam Golay Sequence 61 in the CES 52. In this case, as shown in FIG. 13, since the reception direction is Beam # 7, a Golay code corresponding to this is inserted into the TX Beam Golay Sequence 61. In addition, a Golay code corresponding to the transmission direction Beam # 2 of the device 2 is inserted into the RX Beam Golay Sequence 62. The data frame generated in this way is returned from the device 3 to the device 2 in step S13.

  Next, the process goes to step S14, and the device 2 inserts a Golay code corresponding to Beam # 2 indicating its own transmission direction into the TX Beam Golay Sequence 61 in the CES 52 as shown in FIG. Further, a Golay code corresponding to the communication direction Beam # 7 of the device 3 is inserted into the RX Beam Golay Sequence 62. Thereby, both beam forming is completed.

  In the above-described embodiment, the case where information is Golay-coded and included in the preamble has been described as an example. However, the information may be inserted into a header of a physical layer other than the preamble. Further, the present invention is not limited to the case where the information is Golay-encoded, and it is needless to say that the information may be encoded by any other method and included in the preamble or the like.

DESCRIPTION OF SYMBOLS 1 Wireless communication system 2, 3 Device 21, 31 Communication control part 22, 32 Antenna

Claims (6)

In a wireless communication system that performs wireless communication based on beamforming between a plurality of devices,
Each of the above devices includes transmission means capable of transmitting transmission waves in mutually different transmission directions, and reception means for receiving transmission waves transmitted from the other party in accordance with the reception direction corresponding to the transmission direction,
The device on the transmission side includes the propagation path information regarding the transmission direction of the transmission wave in the preamble of the data frame or the header of the physical layer, and transmits this as the transmission wave.
The reception side device receives the transmission wave, includes reception direction information related to the reception direction in the reception means in the preamble of the data frame or the header of the physical layer, and returns it to the transmission side device.
In response to the return of the data frame from the receiving device, based on the receiving direction information included in the data frame, a transmission wave is transmitted by matching the transmitting direction with the receiving direction in the transmitting device. A wireless communication system characterized by the above. The wireless communication system according to claim 1, wherein the propagation path information is inserted into the data frame based on a Golay code. In a wireless communication system that performs wireless communication based on beamforming between a plurality of devices,
Each of the above devices includes transmission means capable of transmitting transmission waves in mutually different transmission directions, and reception means for receiving transmission waves transmitted from the other party in accordance with the reception direction corresponding to the transmission direction,
The device on the transmission side includes the propagation path information regarding the transmission direction of the transmission wave in the preamble of the data frame or the header of the physical layer, and transmits this as the transmission wave.
The wireless communication system, wherein the receiving device receives the transmission wave and adjusts the reception direction of the reception unit to the transmission direction based on propagation path information included in the data frame. The wireless communication system according to claim 1, wherein the propagation path information and the reception direction information are inserted into the data frame based on a Golay code. In a wireless communication method for performing wireless communication based on beamforming between a plurality of devices,
A transmission step of transmitting a transmission wave whose transmission direction is adjusted based on beamforming from a device on the transmission side;
A receiving step in which a receiving device receives a transmission wave transmitted from the transmitting device according to a receiving direction corresponding to the transmitting direction;
Before starting the transmission step and the reception step,
From the device on the transmission side, the propagation path information related to the transmission direction of the transmission wave is included in the preamble of the data frame or the header of the physical layer, and this is transmitted as the transmission wave.
The receiving device receives the transmission wave, includes reception direction information about its own reception direction in the preamble of the data frame or the physical layer header, and returns it to the transmitting device.
In response to the return of the data frame from the receiving device, based on the receiving direction information included in the data frame, a transmission wave is transmitted by matching the transmitting direction with the receiving direction in the transmitting device. A wireless communication method characterized by the above. In a wireless communication method for performing wireless communication based on beamforming between a plurality of devices,
A transmission step of transmitting a transmission wave whose transmission direction is adjusted based on beamforming from a device on the transmission side;
A receiving step in which a receiving device receives a transmission wave transmitted from the transmitting device according to a receiving direction corresponding to the transmitting direction;
Before starting the transmission step and the reception step,
From the device on the transmission side, the propagation path information related to the transmission direction of the transmission wave is included in the preamble of the data frame or the header of the physical layer, and this is transmitted as the transmission wave.
A wireless communication method, wherein a receiving device receives the transmission wave and adjusts the reception direction in the reception step to the transmission direction based on propagation path information included in the data frame.

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