Communication method, communication system and wireless communication device

Abstract

A communication method is provided, in which a first wireless communication device transmits channel designation information designating a channel for second communication to a second wireless communication device through first communication, the second wireless communication device activates a communication function for performing the second communication in the designated channel, and the first wireless communication device transmits a connection request for the second communication using the designated channel to the second wireless communication device.

Description

Technical Field

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

[0002] Conventionally, it is possible to perform communication between multiple devices through Wi-Fi, Bluetooth (registered trademark), near field communication (NFC), etc. Generally, Wi-Fi can allow high-speed, large-capacity data communication, but requires high power consumption. On the other hand, Bluetooth (registered trademark) and NFC can only allow low-speed, small-capacity data communication, but require lower power consumption than Wi-Fi. Therefore, a scheme called Wi-Fi handover has been proposed, in which communication is performed through Bluetooth (registered trademark) with low power consumption in a stable state, and the communication is switched to a Wi-Fi connection when high-speed, large-capacity data is required.

[0003] Handover requires time to switch the connection method, and a method for reducing the switching time has been proposed (PTL 1).

[0004] [Citation list]

[0005] [Patent Document]

[0006] [PTL 1]

[0007] JP 2016-201840A Summary of the invention

[0008] [Technical issues]

[0009] In addition, according to the recent popularization of communication devices such as smart phones, wireless frequency bands used for communications such as Wi-Fi and Bluetooth (registered trademark) tend to be crowded. In order to ensure a frequency band in which stable communication can be performed in this case, it is necessary to scan adjacent radio conditions. However, when scanning is performed after Wi-Fi is started, there is a problem that the scanning takes time and it takes time to establish a connection. The same problem also occurs when performing a handover of switching from a connected communication method to another communication method.

[0010] The present technology is proposed in view of such a situation, and its purpose is to provide a communication method, a communication system and a wireless communication device that can reduce the time required for communication switching.

[0011] [Solution to the problem]

[0012] In order to solve the above-mentioned problem, the first technology is a communication method, which includes: a first wireless communication device transmits channel designation information specifying a channel to be used for a second communication to a second wireless communication device through a first communication; the second wireless communication device activates a communication function so that the second communication is performed through the designated channel; and the first wireless communication device transmits a connection request for the second communication using the designated channel to the second wireless communication device.

[0013] In addition, the second technology is a communication system, which includes: a first wireless communication device; and a second wireless communication device, wherein the first wireless communication device transmits channel designation information specifying a channel to be used for second communication to the second wireless communication device through the first communication, the second wireless communication device activates a communication function so that the second communication is performed through the designated channel, and the first wireless communication device transmits a connection request for the second communication using the designated channel to the second wireless communication device.

[0014] In addition, a third technique is a wireless communication device configured to transmit channel designation information designating a channel to be used for second communication to another device through first communication, and transmit a connection request for the second communication using the designated channel to the other device.

[0015] Furthermore, a fourth technique is a wireless communication device configured to receive channel designation information for second communication transmitted from another device through first communication, and activate a communication function so that the second communication is performed through the designated channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] [ Figure 1 ] Figure 1 is a block diagram showing the configuration of the communication system 10 .

[0017] [ Figure 2 ] Figure 2 This is a diagram for explaining channels in Wi-Fi in the 2.4 GHz band.

[0018] [ Figure 3 ] Figure 3 This is a diagram for explaining channels in Wi-Fi of the 5 GHz band.

[0019] [ Figure 4 ] Figure 4 A is a block diagram showing the configuration of the first wireless communication device 100, and Figure 4 B is a block diagram showing the configuration of the second wireless communication device 200 .

[0020] [ Figure 5 ] Figure 5 is a flowchart showing a communication switching process.

[0021] [ Figure 6 ] Figure 6 This is a flowchart showing a modified example of the communication switching process. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the present technology will be described with reference to the drawings. The description will be given in the following order.

[0023] <1. Example>

[0024] [1-1. Configuration of Communication System 10]

[0025] [1-2. Configuration of the First Wireless Communication Device 100]

[0026] [1-3. Configuration of the Second Wireless Communication Device 200]

[0027] [1-4. Communication switching process]

[0028] <2. Example of changes>

[0029] <1. Example>

[0030] [1-1. Configuration of Communication System 10]

[0031] First, the communication system 10 according to the present technology will be described. Figure 1 As shown, the communication system 10 includes a first wireless communication device 100 and a second wireless communication device 200. The first wireless communication device 100 and the second wireless communication device 200 have a wireless communication function and can be connected to each other using wireless communication to transmit / receive various types of data. In this embodiment, the first wireless communication device 100 and the second wireless communication device 200 can communicate with each other through at least two communication methods (a first communication method and a second communication method).

[0032] The first wireless communication device 100 and the second wireless communication device 200 are wireless communication devices based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 that implements a peer-to-peer (P2P) connection. The first wireless communication device 100 and the second wireless communication device 200 can form a communication group and communicate directly with each other without using an access point. Therefore, data (e.g., image data and moving image data, etc.) can be directly transmitted from the first wireless communication device 100 to the second wireless communication device 200. Meanwhile, there is Wi-Fi Direct (Wi-Fi Direct) based on IEEE 802.11 as a communication standard for direct communication between wireless communication devices.

[0033] In addition, the first wireless communication device 100 and the second wireless communication device 200 are wireless communication devices based on IEEE 802.15.1. There is Bluetooth (registered trademark) as a standard for direct communication between wireless communication devices based on IEEE 802.15.1.

[0034] In this embodiment, description is made assuming that the first communication method is Bluetooth (registered trademark) and the second communication method is Wi-Fi. Wi-Fi is suitable for transmitting / receiving large-capacity data such as a large amount of image data, moving image data, and programs because it can allow high-speed and large-capacity communication compared to Bluetooth (registered trademark). On the other hand, since Bluetooth (registered trademark) has low power consumption, it is suitable for always being connected although the data capacity for transmission / reception is small.

[0035] Here, the channels of Wi-Fi will be described. Currently, Wi-Fi has two frequency bands, 2.4 GHz and 5 GHz. In addition, each frequency band is divided into a plurality of parts, each part has a specific channel width, and the plurality of parts are respectively set as channels. Figure 2 As shown in FIG. 1 , in the 2.4 GHz band, 13 channels having a channel bandwidth of 22 MHz are set, and adjacent channels and a portion of the band overlap. Therefore, the channels without interference are 1ch, 6ch, and 11ch.

[0036] In addition, in the case of the 5 GHz band, if Figure 3 As shown, there are 19 channels, 4 channels 36, 40, 44 and 48 can be used in W52 of IEEE 802.11a, 4 channels 52, 56, 60 and 64 can be used in W53, and 11 channels 100, 104, 108, 112, 116, 120, 124, 128, 132, 136 and 140 can be used in W56. Since each channel is allocated 20 MHz, all channels can be used without interference when the channel width is 20 MHz.

[0037] By using the 5 GHz band in addition to the 2.4 GHz band in this way, the time required for the process of performing Wi-Fi scanning and determining a channel to be used in order to use Wi-Fi increases.

[0038] Generally, a communication device having a function of performing communication using Wi-Fi has a function of selecting and setting a channel during communication using Wi-Fi. The first wireless communication device 100 and the second wireless communication device 200 also have a function of selecting and setting a channel.

[0039] [1-2. Configuration of the First Wireless Communication Device 100]

[0040] Next, we will refer to Figure 4 A describes the configuration of the first wireless communication device 100. The first wireless communication device 100 includes an operation unit 101, a display unit 102, a storage unit 103, a first communication unit 104, a first antenna 105, a second communication unit 106, a second antenna 107, and a control unit 108.

[0041] The operation unit 101 is used for the user to input various instructions to the first wireless communication device 100. When the operation unit 101 is operated by the user, a control signal according to the operation is generated and the signal is supplied to the control unit 108. Then, the control unit 108 performs various types of processing corresponding to the control signal. In addition to physical buttons, the operation unit 101 may be a touch panel, a touch screen integrated with a display as the display unit 102, or the like.

[0042] The display unit 102 is a display device or the like for displaying content data such as images and videos, messages, and a user interface of the first wireless communication device 100. The display device may be configured as, for example, a liquid crystal display (LCD), a plasma display panel (PDP), an organic electroluminescent (EL) panel, or the like.

[0043] The storage unit 103 is configured as a large-capacity storage medium such as a hard disk and a flash memory, and stores various types of data such as content data, programs required for the operation of the first wireless communication device 100, and information for communicating with other wireless communication devices, etc. For example, the storage unit 103 stores connection information (SSID, PSK, etc.) about other wireless communication devices.

[0044] The first communication unit 104 performs Bluetooth (registered trademark) communication with the second wireless communication device 200 in cooperation with the first antenna 105 according to the control of the control unit 108. For example, in transmission / reception of data in Bluetooth (registered trademark) communication, the first communication unit 104 transmits radio waves reaching a short distance of about several meters from the Bluetooth (registered trademark) antenna, and performs processing necessary for Bluetooth (registered trademark) communication, such as pairing, and the like.

[0045] The second communication unit 106 performs Wi-Fi communication with the second wireless communication device 200 in cooperation with the second antenna 107 according to the control of the control unit 108. For example, the second communication unit 106 performs reception processing such as down-conversion, demodulation, and decoding on the radio signal received by the antenna, and supplies the reception data obtained by the reception processing to the control unit 108. In addition, the second communication unit 106 performs transmission processing such as encoding, modulation, and up-conversion on the transmission data supplied from the control unit 108, and outputs the high-frequency signal obtained by the transmission processing to the antenna.

[0046] The control unit 108 includes a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), etc. The CPU performs various types of processing according to a program stored in the ROM to issue commands, thereby performing control of the entire first wireless communication device 100 and its components.

[0047] The control unit 108 performs Wi-Fi scanning for searching for Wi-Fi by scanning a predetermined frequency band through the second communication unit 106 and the second antenna 107 .

[0048] The control unit 108 generates a handover request message for the Wi-Fi connection with the second wireless communication device 200. The handover request message includes designated channel information for designating a specific channel to be used for communication with the second wireless communication device 200 among a plurality of Wi-Fi channels. Handover is automatic switching between communication base stations or communication methods, and represents switching from Bluetooth (registered trademark) communication to Wi-Fi communication in the present embodiment.

[0049] In order to generate the designated channel information included in the handover request message, the first wireless communication device 100 determines the Wi-Fi channel to be designated. As the Wi-Fi channel to be designated, it is desired to designate a channel with no interference or little interference other than the channel already used by the adjacent Wi-Fi access point or other device. The degree of interference can be confirmed by checking the radio field strength of the channel. In addition, there is also a method in which the first wireless communication device 100 confirms the Wi-Fi channel detected by Wi-Fi scanning and designates a channel other than the Wi-Fi channel. In addition, there is also a method in which the noise of wireless communication is detected by Wi-Fi scanning and an unused idle channel is determined based on the noise.

[0050] The control unit 108 generates an association request frame, which is a connection request frame for processing a Wi-Fi connection with the second wireless communication device 200. The association request frame is transmitted to the second wireless communication device 200 for a Wi-Fi connection request through communication according to the second communication unit 106. The association request frame includes designated channel information indicating a Wi-Fi channel to be used for connection.

[0051] The handover request message is transmitted to the second wireless communication device 200 through Bluetooth (registered trademark) communication according to the first communication unit 104. In addition, the association request frame is transmitted to the second wireless communication device 200 through Wi-Fi communication according to the second communication unit 106.

[0052] The first wireless communication device 100 has a function of selecting a Wi-Fi channel and performing communication when performing Wi-Fi communication through the second communication unit 106 under the control of the control unit 108 .

[0053] [1-3. Configuration of the Second Wireless Communication Device 200]

[0054] Next, we will refer to Figure 4 B describes the configuration of the second wireless communication device 200. The second wireless communication device 200 includes an operation unit 201, a display unit 202, a storage unit 203, a first communication unit 204, a first antenna 205, a second communication unit 206, a second antenna 207, and a control unit 208. The operation unit 201, the display unit 202, the storage unit 203, the first communication unit 204, the first antenna 205, and the second antenna 207 are the same as those in the first wireless communication device 100.

[0055] The first communication unit 204 performs Bluetooth (registered trademark) communication with the second wireless communication device 200 in cooperation with the first antenna 205 according to the control of the control unit 208. For example, in transmission / reception of data in Bluetooth (registered trademark) communication, the first communication unit 204 transmits radio waves reaching a short distance of about several meters from the Bluetooth (registered trademark) antenna, and performs processing necessary for Bluetooth (registered trademark) communication, such as pairing, and the like.

[0056] The second communication unit 206 performs Wi-Fi communication with the first wireless communication device 100 in cooperation with the second antenna 207 according to the control of the control unit 208. For example, the second communication unit 206 performs reception processing such as down-conversion, demodulation, and decoding on the radio signal received by the second antenna 207, and supplies reception data obtained by the reception processing to the control unit 208. In addition, the second communication unit 206 performs transmission processing such as encoding, modulation, and up-conversion on the transmission data supplied from the control unit 208, and outputs the high-frequency signal obtained by the transmission processing to the antenna.

[0057] When the second wireless communication device 200 communicates with the first wireless communication device 100 via Bluetooth (registered trademark), the second communication unit 206 is in a non-operating state (off state or sleep state). When receiving a handover request message in which a Wi-Fi channel has been specified from the first wireless communication device 100, the control unit 208 activates the second communication unit 206 so that the second wireless communication device 200 can perform Wi-Fi communication. This corresponds to the communication function of activating the execution of the second communication in the claims.

[0058] The control unit 208 generates an association response frame which is a connection response frame for the association request from the first wireless communication device 100. The association response frame is transmitted as a response to the association request from the first wireless communication device 100 through the Wi-Fi communication according to the second communication unit 206, and a Wi-Fi connection is established by transmitting the association response frame to the first wireless communication device 100.

[0059] In addition, the control unit 208 is fixed to the Wi-Fi channel designated in the channel designation information received from the first wireless communication device 100, and activates the Wi-Fi communication function (the second communication unit 206). Therefore, the first wireless communication device 100 and the second wireless communication device 200 can perform Wi-Fi communication only through the designated channel. Since the second communication unit 206 is activated in the channel designated in advance by the first wireless communication device 100 to perform communication, the second wireless communication device 200 does not need to perform Wi-Fi scanning. However, the second wireless communication device 200 may have a Wi-Fi scanning function.

[0060] The second wireless communication device 200 has the above-described function of selecting a Wi-Fi channel and performing communication when Wi-Fi communication is performed through the second communication unit 206 under the control of the control unit 208 .

[0061] Thus, the first wireless communication apparatus 100 and the second wireless communication apparatus 200 are configured as described above.

[0062] [1-4. Communication switching process]

[0063] Next, we will refer to Figure 5 The communication switching process between the first wireless communication device 100 and the second wireless communication device 200 is described. Figure 5 , a straight line between the first wireless communication apparatus 100 and the second wireless communication apparatus 200 represents an operation regarding Bluetooth (registered trademark), and a dotted line represents an operation regarding Wi-Fi.

[0064] First, as shown in step S101 , according to Bluetooth (registered trademark), the first wireless communication device 100 and the second wireless communication device 200 are in an always-connected state.

[0065] As shown in step S102, the first wireless communication device 100 performs scanning for Wi-Fi network search. In addition, the first wireless communication device 100 always performs Wi-Fi scanning.

[0066] Then, when switching to Wi-Fi according to an input instruction from a user applied to the first wireless communication device 100, in step S103, the first wireless communication device 100 transmits a handover request message to the second wireless communication device 200. The handover request message includes designated channel information for designating a specific channel to be used for connection among a plurality of Wi-Fi channels.

[0067] In addition, even when the user does not instruct switching to Wi-Fi, the first wireless communication device 100 may perform processing when determining that Wi-Fi is required based on the details of the user instruction to the first wireless communication device 100. For example, when the user instructs data to be transmitted to the second wireless communication device 200, the first wireless communication device 100 may determine that Wi-Fi is required regardless of the data type and size. In addition, when the user instructs data to be transmitted to the second wireless communication device 200, the first wireless communication device 100 may check the data type or size, and determine that Wi-Fi is required when the data type is specific data (image data or moving image data, etc.) or the data size is equal to or larger than a predetermined size.

[0068] Next, in step S104, the second wireless communication device 200 activates its Wi-Fi function (second communication unit 206) to perform Wi-Fi communication in the channel specified by the first wireless communication device 100. Since the Wi-Fi function (second communication unit 206) is activated in the channel specified by the first wireless communication device 100 in this way, the second wireless communication device 200 does not need to activate the Wi-Fi function after performing Wi-Fi scanning and determining the channel. Therefore, compared with the conventional technology of activating the Wi-Fi function after performing Wi-Fi scanning and determining the channel, the time until Wi-Fi communication is available can be shortened.

[0069] Next, after activating the Wi-Fi function in step S104, in step S105, the second wireless communication device 200 transmits a service set identifier (SSID) and a passkey as connection information for Wi-Fi connection to the first wireless communication device 100. SSID is an ID of an access point in Wi-Fi (wireless LAN). Passkey is a password (encryption key) for connecting to Wi-Fi.

[0070] Next, in step S106, the first wireless communication device 100 performs an association request by transmitting an association request frame for Wi-Fi connection to the second wireless communication device 200 in the channel designated thereby. Here, the association request frame includes information on a channel requested for use, which designates a channel to be used for communication.

[0071] Next, in step S107 , the second wireless communication device 200 performs an association response by transmitting an association response frame as a connection permission response to the association request from the first wireless communication device 100 .

[0072] Next, in step S108, the first wireless communication device 100 generates a pre-shared key (PSK). The PSK is a technology used for wireless LAN connection, and is a pre-public key for two devices to be wirelessly connected.

[0073] Then, in step S109, handshake for establishing communication is performed in the first wireless communication device 100 and the second wireless communication device 200. Handshake is to perform communication between different devices, and communication speed, data format, other configurations and parameters are transmitted and received after a communication path is established before full communication is performed.

[0074] At the same time, if Figure 6 As shown in step S201 of the present invention, a handover request message for Wi-Fi connection may be transmitted from the second wireless communication device 200 instead of from the device for the designated channel. In this case, the handover request message does not include the designated channel information. Therefore, as shown in step S202, the first wireless communication device 100, which has received the handover request message from the second wireless communication device 200, transmits designated channel information indicating a channel to be used for Wi-Fi communication to the second wireless communication device 200 through Bluetooth (registered trademark) communication. Processing other than the above steps and reference Figure 5 The process described is the same.

[0075] As described above, switching from Bluetooth (registered trademark) connection to Wi-Fi connection is performed according to the first wireless communication device 100 and the second wireless communication device 200. According to this method, since Wi-Fi connection is performed in a pre-specified channel, stable and high-speed communication can be established by specifying a stable channel. In addition, the second wireless communication device 200 does not need to perform Wi-Fi scanning and determine a channel in order to connect to the first wireless communication device 100, and thus can perform switching connection from Bluetooth (registered trademark) to Wi-Fi in a shorter time than conventional technology.

[0076] As a specific use example of the present technology, for example, there is an example in which the first wireless communication device 100 is a smartphone and the second wireless communication device 200 is a camera. When a plurality of pictures captured by the camera are transmitted from the camera to the smartphone, due to the low communication speed, Bluetooth (registered trademark) cannot transmit the pictures or takes a long time to transmit the pictures. In this case, by switching the Bluetooth (registered trademark) connection to Wi-Fi using the present technology, a plurality of pictures can be transmitted to the smartphone through the high-speed communication of Wi-Fi in a shorter time than conventional technology.

[0077] In addition, when the first wireless communication device 100 is a camera and the second wireless communication device 200 is a smart phone, by switching from Bluetooth (registered trademark) connection to Wi-Fi in the same manner, multiple pictures can be transferred from the camera to the smart phone via Wi-Fi communication in a short time.

[0078] The first wireless communication device 100 and the second wireless communication device 200 may be configured as devices that perform the handover process of the present technology, or the first wireless communication device 100 and the second wireless communication device 200 may be configured by operating a program in an existing wireless communication device. The program may be pre-installed in the wireless communication device, or downloaded or distributed through a storage medium, etc. and installed by the user. In addition, the functions of the present technology may be realized not only by a program, but also as a combination of a dedicated device and a circuit, etc. using hardware having these functions.

[0079] <2. Example of changes>

[0080] Although the embodiments of the present technology have been specifically described above, the present technology is not limited to the above-described embodiments, and various modifications based on the technical spirit of the present technology are possible.

[0081] The first wireless communication device 100 and the second wireless communication device 200 are not limited to smart phones and cameras, and can be any device having the first and second communication functions, such as a smart speaker, a communication robot, a fixed personal computer, a laptop computer, a tablet terminal, a portable game console, and a wearable device.

[0082] The communication by the first communication unit 104 of the first wireless communication device 100 and the first communication unit 204 of the second wireless communication device 200 is not limited to Bluetooth (registered trademark), and may be other methods. As other methods, Bluetooth low energy and NFC, which are low power consumption communication standards of Bluetooth (registered trademark), etc., can be conceived.

[0083] Although an example of connection of two devices of the first wireless communication device 100 and the second wireless communication device 200 has been described in the embodiment, the present technology can also be applied to connection of three or more devices.

[0084] Despite Figure 5 and Figure 6In the description of , the second wireless communication device 200 transmits the connection information (SSID and master key) to the first wireless communication device 100, but if the connection information is pre-stored in the first wireless communication device 100, the second wireless communication device 200 does not need to transmit the connection information. In this case, the second wireless communication device 200 may notify the first wireless communication device 100 of the activation of the second communication unit 206 (Wi-Fi communication function) through the first communication. The first wireless communication device 100 that has received the notification may transmit an association request frame to the second wireless communication device 200 to establish a Wi-Fi connection. However, even when the second wireless communication device 200 does not notify the first wireless communication device 100 of the activation of the second communication unit 206 (Wi-Fi communication function), the first wireless communication device 100 may transmit an association request frame under the assumption that the second wireless communication device 200 has activated the Wi-Fi communication function after a predetermined period of time has passed from the transmission of the handover request message.

[0085] The present technology may also be configured as follows.

[0086] (1) A communication method, comprising:

[0087] transmitting, by the first wireless communication device to the second wireless communication device through the first communication, channel designation information that designates a channel to be used for the second communication;

[0088] activating a communication function by the second wireless communication device so that the second communication is performed through the designated channel; and

[0089] A connection request for the second communication using the designated channel is transmitted by the first wireless communication device to the second wireless communication device.

[0090] (2) The communication method according to (1), wherein the second communication has a communication speed higher than a communication speed of the first communication.

[0091] (3) The communication method according to (1) or (2), wherein the first communication has lower power consumption than power consumption of the second communication.

[0092] (4) The communication method according to any one of (1) to (3), wherein the first communication is Bluetooth.

[0093] (5) The communication method according to any one of (1) to (4), wherein the second communication is Wi-Fi.

[0094] (6) The communication method according to any one of (1) to (5), wherein the second wireless communication device transmits connection information for the second communication to the first wireless communication device through the first communication.

[0095] (7) The communication method according to any one of (1) to (6), wherein the first wireless communication device and the second wireless communication device are always connected to each other through the first communication.

[0096] (8) A communication system comprising:

[0097] a first wireless communication device; and

[0098] A second wireless communication device, wherein

[0099] the first wireless communication device transmitting, to the second wireless communication device through the first communication, channel designation information designating a channel to be used for the second communication,

[0100] the second wireless communication device activates a communication function so that the second communication is performed through a designated channel, and

[0101] The first wireless communication device transmits a connection request for the second communication using the designated channel to the second wireless communication device.

[0102] (9) A wireless communication device configured to transmit channel designation information that designates a channel to be used for second communication to another device through first communication, and to transmit a connection request for the second communication using the designated channel to the other device.

[0103] (10) A wireless communication device configured to receive channel designation information for second communication transmitted from another device through first communication, and activate a communication function so that the second communication is performed through the designated channel.

[0104] [reference numerals list]

[0105] 10. Communication System

[0106] 100 first wireless communication device

[0107] 200 Second wireless communication device

Claims

1. A communication method, comprising: When it is determined that switching from the first communication to the second communication is required, the first wireless communication device transmits, to the second wireless communication device, channel designation information that designates a channel to be used for the second communication among a plurality of channels that can be used for the second communication, the channel designation information being transmitted using the first communication; activating, by the second wireless communication device, a communication function for performing second communication on the designated channel after transmitting the channel designation information, so that the second communication is performed through the channel designated by the first wireless communication device without activating the communication function for the second communication after the second wireless communication device performs second communication scanning and determines the channel; and A connection request for the second communication using the designated channel is transmitted by the first wireless communication device to the second wireless communication device.

2. The communication method according to claim 1, wherein: The second communication has a communication speed higher than a communication speed of the first communication.

3. The communication method according to claim 1, wherein: The first communication has lower power consumption than power consumption of the second communication.

4. The communication method according to claim 1, wherein: The first communication is Bluetooth.

5. The communication method according to claim 1, wherein: The second communication is Wi-Fi.

6. The communication method according to claim 1, wherein: The second wireless communication device transmits connection information for the second communication to the first wireless communication device through the first communication.

7. The communication method according to claim 1, wherein: The first wireless communication device and the second wireless communication device are always connected to each other through the first communication.

8. A communication system comprising: a first wireless communication device; as well as A second wireless communication device, wherein when it is determined that switching from the first communication to the second communication is required, the first wireless communication device transmits, to the second wireless communication device through the first communication, channel designation information that designates a channel to be used for the second communication among a plurality of channels that can be used for the second communication, the channel designation information being transmitted using the first communication, After the first wireless communication device transmits the channel designation information, the second wireless communication device activates a communication function for performing second communication on the designated channel, so that the second communication is performed through the channel designated by the first wireless communication device without activating the communication function for the second communication after the second wireless communication device performs second communication scanning and determines the channel, and The first wireless communication device transmits a connection request for the second communication using the designated channel to the second wireless communication device.

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