JP6551483B2 - Wireless communication apparatus, wireless communication method and program - Google Patents

Description

The present invention relates to a wireless communication apparatus, a wireless communication method , and a program.

  Conventionally, there is a technology that enables access to a network such as the Internet by connecting a plurality of electronic devices (wireless communication devices) having a wireless communication function related to a wireless LAN (IEEE 802.11) to an access point. The access point is conventionally fixed and arranged. Therefore, when the user of the portable wireless communication device moves and continues to connect to the network, there is a technique for switching to an appropriate access point as needed.

  When connecting a plurality of wireless communication devices so as to belong to a limited local network (LAN), in the situation where access points are changed over from time to time as described above, forming the local network across different access points is not possible. difficult. Therefore, a plurality of wireless communication devices are connected to the same access point to form one local network (subnet).

  In this case, when a plurality of wireless communication devices individually switch to different access points, the timing of the transfer is not uniform, and network connection in the LAN between one wireless communication device and another wireless communication device A situation of temporary disconnection may occur, which may cause problems in transmitting and receiving data that you want to send and receive in a limited and quick manner only within the LAN. On the other hand, according to Patent Document 1, one access point to which a wireless communication device (client) is connected can detect another access point, and the one access point is connected to the other access point. In the case where it is determined whether or not to change and the change is to be made, there is described a technology of making a request for changing the connection destination to the connected wireless communication apparatus and disconnecting the connection.

WO 2010/110426

  However, assuming that the access point side controls the switching timing, all access points to be connected to the wireless communication device need to have the same configuration and function, and communication among a plurality of specific wireless communication devices There is a problem that cost and labor are required to keep

An object of the present invention is to provide a wireless communication device, a wireless communication method, and a program capable of easily maintaining communication connection between a plurality of specific wireless communication devices without much expense and labor.

In order to achieve the above object, the present invention is
Wireless communication means for transmitting and receiving communication data with the first wireless communication device, the second wireless communication device, and the third wireless communication device;
Based on a predetermined connection criteria, and connection destination setting means for determining a connection timing to different ones of the second wireless communication device with the currently connected first radio communication device,
When the setting to change the connection destination to the second wireless communication device is performed at the connection timing, a change request to cause the wireless communication unit to transmit information related to the connection timing to the third wireless communication device Transmission control means,
A wireless communication apparatus comprising:

Wireless communication means for transmitting and receiving communication data with the first wireless communication device and the second wireless communication device;
If the information relating to the second wireless communication device is received by the wireless communication means in a state connected to the first wireless communications device, the connection destination to the wireless communication unit at a predetermined connection time Connection control means for changing to the second wireless communication device;
A wireless communication device comprising:

  According to the present invention, there is an effect that communication connection between a plurality of specific wireless communication devices can be easily maintained without much cost and effort.

1 is an overall view showing an embodiment of a wireless communication system of the present invention. They are a block diagram showing functional composition of a communication apparatus (master), and a block diagram showing functional composition of a communication apparatus (slave). It is a sequence diagram of communication concerning voice distribution between a parent communication device, an access point, and a communication device. It is a figure explaining the format of the data for audio | voice delivery. It is a flowchart which shows the control procedure of an audio | voice data delivery process. It is a flowchart which shows the control procedure of an audio | voice data reception process. It is a flowchart which shows the modification of an audio | voice data delivery process. FIG. 13 is a sequence diagram of communication related to voice distribution between a parent communication device, an access point, and the communication device in the wireless communication system of the second embodiment. It is a flowchart which shows the control procedure of the audio | voice data delivery process of 2nd Embodiment. It is a flowchart which shows the control procedure of the audio | voice data reception process of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described based on the drawings.
First Embodiment
FIG. 1 is an overall view showing a first embodiment of a wireless communication system of the present invention.

  The wireless communication system 1 according to the first embodiment includes one parent communication device 10 (master client, master wireless communication device, wireless communication device, computer), and a plurality of communication devices 20 (slave client, other wireless communication). Device, a slave wireless communication device), and an access point 40 (relay unit) used one at a time for connection. The parent communication device 10 and the communication device 20 are connected via a wireless LAN (Local Area Network) via the access point 40, and wireless communication is possible.

  The parent communication device 10 transmits voice to the communication device 20 by multicast using a voice transmission application (program). Also, the parent communication device 10 outputs a control signal for simultaneously switching the own device and the access point 40 to which the communication device 20 is connected. For example, a smartphone or the like is used as the parent communication device 10. However, a dedicated communication device such as a voice guide device for a specific purpose may be used, or a notebook PC or the like may be used.

  The communication device 20 decodes the sound data transmitted from the parent communication device 10 and outputs the sound. Further, the communication device 20 switches the access point relating to the wireless LAN at the set timing according to the connection control data transmitted from the parent communication device 10. As the communication device 20, a smartphone or the like is used similarly to the parent communication device 10.

  The access point 40 has a function of a switching hub that controls transmission and reception of wireless communication data between at least a plurality of communication devices (including the parent communication device 10), and in this case, connection with an external Internet or the like is Possible routers and L3 (layer 3) switches. All or part of the clients connected to the access point 40 are set in the same LAN (subnet). For example, a fixed IP address is assigned to the parent communication device 10 and the communication device 20 in advance, and the access point 40 (router) is configured to include all the assigned IP addresses in the same LAN.

FIG. 2 is a block diagram showing the functional configuration of the parent communication device 10 and the communication device 20 of the present embodiment.
As shown in FIG. 2A, the parent communication device 10 includes a CPU 11 (central processing unit) (connection destination setting unit, change request transmission control unit, connection control unit, first connection control unit, data transmission control unit). , ROM 12 (Read Only Memory), RAM 13 (Random Access Memory), input / output interface 14, storage unit 15 (storage unit), input unit 16, output unit 17, communication unit 18 (wireless communication unit, A first wireless communication means), a bus 19 and the like are provided.

  The CPU 11 performs various arithmetic processing to control the overall operation of the parent communication device 10. Further, the CPU 11 executes an audio distribution program 150 described later, and distributes the audio input from the input unit 16 to the communication device 20.

  The ROM 12 stores a basic control program related to the operation of the parent communication device 10 and initial setting data. The ROM 12 may have, as a built-in storage, an EEPROM or a flash memory that can be rewritten and updated in addition to the mask ROM.

  The RAM 13 provides the CPU 11 with a working memory space, and stores temporary data. Various volatile memories such as DRAM and SRAM are used as the RAM 13.

  The input / output interface 14 is connected to the bus 19 together with the CPU 11, the ROM 12 and the RAM 13 (collectively referred to as a control unit), and controls the exchange of data between the outside and the control unit according to the standard of the connected device.

  The storage unit 15 is a removable portable external storage medium, and is, for example, a miniSD card or the like. The miniSD card stores various applications (programs) and data. The program stored in storage unit 15 includes an audio distribution program 150, and this audio distribution program 150 further controls communication control program 151 for controlling the setting of access points of parent communication device 10 and communication device 20. Is included.

  The input unit 16 has an operation unit 161 for receiving a user operation, and the operation unit 161 is provided, for example, on a touch panel provided overlapping the display screen of the output unit 17 or on the side surface of the case of a smartphone A push button switch and / or a slide switch are provided. The input unit 16 converts the operation performed on the operation unit 161 into an electric signal and outputs the electric signal to the input / output interface 14 as an input signal. Further, the input unit 16 has a microphone 162 (microphone) for acquiring voice.

  The output unit 17 outputs a signal that can be perceived by the user's vision, hearing, touch, and the like. The output unit 17 includes a display unit having a display screen, an audio output unit 171 for performing a notification operation in response to an incoming call, a vibration generation unit, and the like. For the display screen, for example, an LCD (Liquid Crystal Display) is used, but the present invention is not limited to this. Further, the display unit may include an LED (Light Emitting Diode) lamp and the like. The sound output unit 171 includes a speaker that outputs sound, an earphone connection terminal (earphone jack), a circuit including a piezoelectric element that generates a beep sound, and the like. Moreover, as a vibration generation part, the vibration motor etc. with a weight are used, for example.

  The communication unit 18 performs wireless communication with the outside of the parent communication device 10 according to a predetermined standard. The communication unit 18 is, for example, a transmission / reception circuit of a communication radio wave with a base station for performing telephone communication and a built-in antenna, and a network card for performing data communication by connecting to the Internet or a wireless LAN (IEEE 802.11). And an antenna. The communication unit 18 may also include an RF IC tag for performing near-field wireless communication, a communication module for performing near-field wireless communication such as Bluetooth communication (registered trademark: Bluetooth), and the like.

The bus 19 is a communication path for exchanging data between each unit of the control unit and the input / output interface 14.
The input / output interface 14 can be separately provided for the storage unit 15, the input unit 16, the output unit 17, and the communication unit 18 and connected to the bus 19.

As shown in FIG. 2B, the communication device 20 includes a CPU 21 (connection control means, second connection control means), a ROM 22, a RAM 23, an input / output interface 24, a storage unit 25, an input unit 26, and , An output unit 27, a communication unit 28, a bus 29, and the like. The input unit 26 includes an operation unit 261 and a microphone 262, and the output unit 27 includes an audio output unit 271.
Among them, the CPU 21, the ROM 22, the RAM 23, the input / output interface 24, the input unit 26, the output unit 27, the communication unit 28 and the bus 29 respectively correspond to the CPU 11, the ROM 12, the RAM 13 and the input / output interface 14 in the parent communication device 10. The configuration is the same as that of the input unit 16, the output unit 17, the communication unit 18, and the bus 19, and the description will be omitted.

  The storage unit 25 is a portable external storage medium such as a miniSD card as the storage unit 15 in the parent communication device 10. The storage unit 25 stores an audio reception program 251 for receiving and reproducing the audio distributed from the parent communication device 10.

Next, audio distribution from the parent communication device 10 to the communication device 20 will be described.
FIG. 3 is a sequence diagram showing exchange of data related to audio distribution.

  Voice distribution from the parent communication device 10 to the plurality of communication devices 20 is performed by a wireless LAN via the access point 40 in a state where the parent communication device 10 and the communication device 20 are connected to the same access point 40. By executing the voice distribution program 150, the voice input to the microphone 162 of the parent communication device 10, for example, an announcement by a tourist guide or the like is distributed to the communication device 20 in substantially real time.

  The audio data to be distributed is divided for each predetermined data length, and multicast transmitted to the access point A to which the parent communication device 10 is connected with the communication device 20 set in advance at a predetermined interval as a transmission destination. Alternatively, when only the parent communication device 10 and the communication device 20 are in the same LAN, broadcast transmission may be used. The router of the access point A transfers this voice data to each communication apparatus 20 set (multicast setting) as a multicast transmission destination. Here, the multicast setting is performed by setting a fixed IP address of the communication apparatus 20 of the transmission destination in advance and storing the fixed IP address in the storage unit 15. Therefore, these fixed IP addresses are defined as addresses within the same subnet (LAN) where multicast setting is possible.

  The master communication device 10 receives the broadcast transmission of the beacon including the SSID and the like from each access point 40 at any time in a setting state where the access point can be changed, and identifies the access point 40 and determines the reception strength. In the SSID stealth mode in which the access point does not transmit the SSID, a probe request is made by designating the SSID in the access point list of the connection destination stored in advance in the storage unit 15 from the parent communication device 10, and the reply Is received and the received intensity is determined.

  In this case, the reception strength (power value or power value or the like) is satisfied from an access point B (second relay unit) different from the access point A (first relay unit) to which the parent communication device 10 is currently connected. If it is determined that a transmission radio wave having a radio wave strength such as an amplitude or the like equal to or higher than a reference value is received, the parent communication device 10 determines to change the connection destination to access point B, and transmits multicast data with voice data. And control data including information (in this case, count time (standby time)) related to the access point of the change destination and the change timing (connection timing), and is transmitted to the access point A by multicast. The router of the access point A transmits this transmission data to each communication device 20 designated by multicast.

  The parent communication device 10 continues to transmit data including voice data to the communication device 20 and counts the count time until the connection destination switching timing. Similarly, the communication device 20 continues to receive and process voice data from the parent communication device 10 via the access point A, and as control data, from the parent communication device 10 (one wireless communication device defined in advance) Count the acquired count time.

  When the count time is counted, each of the parent communication device 10 and the communication device 20 disconnects the connection with the access point A and performs connection authentication with the access point B, and changes the access point B to the connection destination. When the connection authentication is performed, the parent communication device 10 multicasts audio data to be distributed to the communication device 20 to the access point B. The router of the access point B transmits the voice data to each communication device 20 of the multicast designation destination, and the communication device 20 appropriately processes and reproduces the received voice data.

FIG. 4 is a diagram showing the format of data transmitted from the parent communication device 10 in the present embodiment.
The parent communication device 10 according to the present embodiment converts the voice signal acquired by the microphone 162 into digital data, and uses RTP (Real-time Transport Protocol) (a predetermined format) to generate UDP / IP (User Datagram Protocol / Internet Protocol). Delivery in real time by multicast transmission. As shown in FIG. 4A, RTP data is generated by attaching an RTP header to the front of an RTP payload composed of voice data and the above control data. A MAC (Media Access Control) frame body is obtained by further adding a UDP header (transport layer), an IP header (network layer), and the like to the RTP data. The communication unit 18 appropriately encrypts the MAC frame body (WEP, WPA-TKIP, WPA2-AES, etc.), adds an IEEE 802.11 header to generate a MAC frame, and further generates MAC frame data (frame data). A physical header is added and transmitted to the access point 40. Each communication apparatus 20 confirms that the frame data transmitted from the access point 40 is addressed to the MAC address of the own apparatus (addressed to the MAC address corresponding to the multicast address including the own apparatus), and takes in the frame data. The encrypted MAC frame body is decrypted, and data is acquired and processed in a format according to UDP / IP and RTP.

As shown in FIG. 4B, at the beginning of the RTP header (the fixed header is 12 bytes), the number of RTP version identifiers, flags related to the presence of padding settings and extension headers, and the number of identifiers of CSRC (Contributing Source) 16 bits (2 bytes) including marker bits are included, and the last 7 bits of the 16 bits are the identifier (header information) of the RTP payload. In the RTP payload identifier, a part of “0” to “127” is assigned as a default value according to the encoding method of audio data, moving image data, etc. In the wireless communication system 1 of this embodiment, For a number to which no default value is assigned, the presence / absence or type of control data is set by the voice distribution program and used. Here, for example, when the RTP payload identifier is “21”, as shown in FIG. 4C, the content of the RTP payload is only voice data in a predetermined format (compression format), and “22” In this case, as shown in FIG. 4 (d), control data (additional information) of a predetermined length N is included at the beginning of the RTP payload, and normal voice data is added after that. .
Here, although the control data is part of the RTP payload, it may be an element of an extension header that is disposed following the fixed header of the RTP header.

  In the control data, as described above, information related to the access point of the change destination, for example, an SSID (Service Set Identifier), key data for encrypting communication, and a count time for determining a switching timing are predetermined. They are arranged in order or format, and are decoded and acquired by the communication device 20 according to the order or format. In this manner, the control data is inserted into the normal audio data to be distributed periodically, as necessary, and the insertion can be classified by the RTP payload identifier, so that the audio distribution program including the setting and / Alternatively, simply by installing and executing the receiving program, switching of access points can be easily performed at substantially the same timing by the parent communication device 10 and the communication device 20.

  FIG. 5 is a flowchart showing a control procedure by the CPU 11 of the audio data distribution process executed by the parent communication device 10.

  The audio data distribution process is activated in response to an input operation to the operation unit 161 of the input unit 16 in the parent communication device 10 in a state where the parent communication device 10 is connected to one access point 40. When the audio data distribution process is activated, the CPU 11 starts the process of digitizing the audio signal acquired by the microphone 162 at a predetermined sampling rate and generating frame data including the digitized audio data (step S101). ). The CPU 11 determines whether or not the connection destination shift preparation mode is set (step S102). If the setting is not to change the access point even if there is another access point that satisfies the connection standard related to the reception strength ("NO" in step S102), the processing of the CPU 11 is , And move on to step S104.

  If it is determined that the connection destination transition preparation mode is set ("YES" in step S102), the CPU 11 acquires the reception strength from each access point based on the reception data of the transmission radio wave from the access point, It is determined whether there is a radio wave being received from the access point stored in the access point list (candidate list) with a reception strength higher than the reference value (step S103). Here, the reception strength higher than the reference value can be conditioned not only on the instantaneous value, but also on being stably received continuously for a predetermined time or more. When it is determined that there is no radio wave of the reception intensity equal to or more than the reference value ("NO" in step S103), the processing of the CPU 11 shifts to step S104.

  When the process proceeds from the determination process of steps S102 and S103 to the process of step S104, the CPU 11 transmits the frame data using only the audio data as the RTP payload with the RTP payload identifier “21” (step S104). Then, the process of the CPU 11 returns to step S102.

  If it is determined in the determination process of step S103 that there is a radio wave of a reception strength equal to or greater than the reference value transmitted from the listed access points ("YES" in step S103), the CPU 11 accesses the radio wave The point is determined to be the connection transfer destination, the RTP payload identifier is set to “22”, and the frame data is transmitted using the SSID, encryption key, and count time of the access point together with the voice data as the RTP payload (step S105). . Further, the CPU 11 starts counting to count down the transmitted count time to "0" as an initial value (step S106).

  The CPU 11 determines whether the counted count has become "0" (step S107). If it is determined that the value is not "0" ("NO" in step S107), the CPU 11 transmits frame data using the RTP payload identifier as "21" and voice data as the RTP payload (step S108). . Thereafter, the processing of the CPU 11 returns to step S107.

  If it is determined that the counted value is “0” (“YES” in step S107), the CPU 11 cancels the connection with the current access point and determines the access point determined as the migration destination Communication connection processing with the above, and authentication is performed to establish a connection (step S109). The CPU 11 transmits frame data using the RTP payload identifier as “21” and the voice data as the RTP payload to the new access point where the connection is established (step S110). Then, the process of the CPU 11 returns to step S102.

  This voice data distribution process is ended at any time by the interrupt process when the end instruction is input by the user operation.

FIG. 6 is a flowchart showing a control procedure by the CPU 21 of the audio data reception process executed by the communication device 20 of the present embodiment.
This voice data reception process is started by a start command related to a predetermined input operation to the operation unit 161 of the input unit 16 by the user.

  When the voice data reception process is started, the CPU 21 starts obtaining frame data including voice data (step S151), reads the RTP payload identifier of the obtained frame data, and the RTP payload has connection control data attached. It is determined whether there is any (ie, whether the RTP payload identifier is "22") (step S152). When it is determined that the connection control data is not attached (that is, the RTP payload identifier is "21") ("NO" in step S152), the CPU 21 determines that the RTP payload is all audio data, and the audio data Is performed (decode etc.), and the sound is reproduced and output at an appropriate timing (step S154). Then, the process of the CPU 21 returns to step S152.

  If it is determined in the determination process of step S152 that the connection control data is attached (that is, the RTP payload identifier is "22") ("YES" in step S152), the connection control data from the RTP payload of the CPU 21 The count time is set as an initial value, and the countdown to “0” is started (step S156). The CPU 21 determines whether the counted time counted has reached "0" (step S157). If it is determined that the value is not "0" ("NO" in step S157), the CPU 21 processes the voice data using the RTP payload as voice data (step S158).

  When it is determined that the count time is "0" ("YES" in step S157), the CPU 21 releases the connection with the current access point and is set in the connection control data. Connection A communication connection process with an access point of a transfer destination is started, connection authentication is performed, and a connection is established (step S159). Then, the CPU 21 processes the audio data received from the new access point (step S160). Then, the process of the CPU 21 returns to step S152.

  This voice data reception process is terminated as an interrupt process as needed upon acceptance by the operation unit 161 of the user operation.

[Modification]
FIG. 7 is a flowchart showing a modification of voice data distribution processing in the wireless communication system 1 of the present embodiment.

  This voice data distribution process is performed when one access point is carried by the user along with the parent communication device 10 and is always in a connectable state. The access point carried may be the parent communication device 10 itself. This audio data distribution process is the same except that the processes of steps S111 and S112 are added to the audio data distribution process described in the above embodiment, and the same process contents are denoted by the same reference numerals. I omit explanation.

  When the process of step S101 is completed, the CPU 11 determines whether the radio wave reception intensity from the currently connected access point is less than a predetermined connection standard (ie, does not satisfy the connection standard (connection continuation standard)). Is determined (step S111). Here, when the current access point is one of the above-mentioned access points being carried, the radio wave reception strength usually does not fall below the connection standard.

  If it is determined that it is not less than the connection standard (including the case where it is connected to the access point being carried) (“NO” in step S111), the processing of the CPU 11 proceeds to step S102. When it is determined that it is less than the connection standard (“YES” in step S111), the CPU 11 returns the setting for returning the connection destination to the carried access point (connection return timing), that is, the connection described above. The process is performed along with the setting of the count time (waiting time) similar to the timing (step S112), and the process proceeds to step S105.

  As described above, in the voice data distribution process of the present modification, the connection destination is changed to the access point only when there is another access point with a high reception strength, based on the connection to the carried access point.

As described above, the parent communication device 10 of the wireless communication system 1 of the present embodiment is connected to the access point of the wireless communication, and the communication unit 18 that transmits and receives communication data via the access point by the wireless communication. And a CPU 11. The CPU 11 determines connection timing to the access point B and the access point B different from the currently connected access point A based on a predetermined connection standard related to the reception strength as connection destination setting means, and transmits a change request When setting is made to change the connection destination to the access point B at connection timing as control means, the communication unit 18 uses the communication unit 18 to obtain information on the access point B and information on the connection timing for the communication device 20 determined in advance. Further, as a connection control unit, the communication unit 18 is changed to the access point B at a connection timing determined by the connection destination setting unit.
That is, since the access point to which the communication device 20 is connected can be collectively controlled to be the same as the access point to which the parent communication device 10 is connected, the parent communication device 10 and the communication device 20 can be easily It is possible to maintain communication. In addition, it is possible to collectively transmit data by multicast or the like to reduce a load, and delay due to transmission data passing through a plurality of routers is not increased.

  The communication device 20 also includes a communication unit 28 that connects to an access point of wireless communication and transmits and receives communication data via the access point by the wireless communication, and a control unit (CPU 21). When the control unit receives the information on the access point B and the information on the connection timing to the access point B by the communication unit 28 in a state of being connected to the access point A as the connection control means, the connection The communication unit 28 is changed to the access point B at the timing. Therefore, the access point can be changed at a timing appropriate for communication with the external parent communication device 10 or the like in response to a request from the external parent communication device 10 or the like instead of individual setting in the communication device 20. Therefore, communication between a plurality of specific wireless communication devices can be easily maintained without requiring a large expense and effort due to addition of hardware or a change in configuration. In particular, data transmitted only inside the LAN such as multicast transmission data and data preferably transmitted inside the LAN can be received without interruption. Further, by designating the connection timing to be changed to the access point B, it is possible to suppress variation in the timing of actually shifting the connection destination to the access point B for each communication device 20.

  Further, the wireless communication system 1 including the above-mentioned parent communication device 10 and communication device 20 switches the access point by the communication device 20 at the same timing as the parent communication device 10 in response to the change request of the connection destination by the parent communication device 10. It is possible to manage switching of access points with easy processing without requiring an additional hardware configuration. Therefore, communication between the parent communication device 10 and the communication device 20 can be easily and appropriately maintained while preventing the occurrence of a situation where there is no need for capital investment and the access point not supported by the hardware can not be used. You can do it. Further, by switching the access points collectively in this manner, it is possible to prevent the communication device in the wireless communication system 1 from using the access points for more than necessary time. In addition, since the access point is separately changed between the data transmission side and the data transmission side, the data delivery route is finely changed, and it is possible to suppress the occurrence of a delay in data delivery or an inability to communicate.

The voice distribution program 150 installed in the parent communication device 10 is connected to an access point of wireless communication, and includes a communication unit 18 that transmits and receives communication data via the access point by the wireless communication (parent communication (parent communication Device 10), connection destination setting means for determining the connection timing to the access point B different from the currently connected access point A and the connection point to the access point B based on the predetermined connection standard related to the reception strength, and the connection destination Change request transmission control means for causing the communication unit 18 to transmit information on the access point B and information on connection timing to the predetermined communication device 20 when setting to change to the access point B is made, connection destination setting Access the connection destination to the communication unit 18 at the connection timing determined by the means Connection control means for changing to Into B, to function as a.
As a result, it is possible to collectively manage access points to which the communication apparatus 20 of the communication destination is connected only by software operation without changing or adding hardware. Accordingly, communication connection can be easily maintained between the parent communication device 10 and each communication device 20, and data can be transmitted and received without causing a large delay. In particular, when transmitting data required for real time property or data to a plurality of communication devices 20 by multicast etc., it is possible to transmit / receive data without load on the network.

Further, the voice receiving program 251 installed in the communication device 20 of the present embodiment is connected to the access point of the wireless communication, and includes the communication unit 28 which transmits and receives communication data via the access point by the wireless communication. When the communication unit 28 receives the information on the access point B and the information on the connection timing to the access point B while the computer (control unit) of the device 20 is connected to the access point A, A voice reception program 251 is provided that causes the communication unit 28 to function as a connection control unit that changes the connection destination to the access point B at the connection timing.
As a result, the communication device 20 can easily change the access point at the same timing as the parent communication device 10 only by software processing without corresponding hardware. Therefore, communication data from the parent communication device 10 can be continuously acquired without applying a large load to the network without a large delay.

  Further, since the connection destination setting means determines the access point B based on the radio wave intensity from the access point received by the communication unit 18, the access is actually made by the parent communication device 10 and the communication device 20 that should be around it. The access point B can be determined by judging whether the point B can be used.

  Further, in particular, the connection destination setting unit sets an access point for transmitting a radio wave of the radio wave intensity as the next connection destination when the radio wave intensity exceeds the reference value continuously for a predetermined time or more. As it is determined, it is possible to determine whether the reception state is appropriate to stably maintain the connection state and to select the access point more reliably.

Further, the connection destination setting means determines the access point B again as the connection destination when the access point B does not satisfy the connection continuation criteria relating to the predetermined radio wave intensity in the state of being connected to the access point B. When the connection return timing to access point A is determined, and the change request transmission control means is set to change the connection destination to access point A, the communication device 20 receives the information on access point A and the connection return timing. Such information is transmitted by the communication unit 18, and the connection control unit causes the communication unit 18 to change the connection destination to the access point A at the connection return timing.
In this way, when the access point A to be carried is held and in principle it is always possible to connect with the parent communication device 10 and the communication device 20, it is collectively grouped with other access points mainly fixed as far as possible. Since the connection destination can be changed, the load on the access point A carried can be reduced. In addition, since the fixed access point B often has better performance than the portable access point A carried, the communication can be performed efficiently. In addition, in the access point B fixed in this way, information such as commentary in the case where the fixed place is a tourist spot or guidance in the case where the fixed place is a store etc. is broadcasted by information corresponding to the fixed place. Since it is easy, it is possible to guide the connection destination of the communication device 20 to the access point B appropriately and at appropriate timing.

The voice distribution program 150 also causes the parent communication device 10 (computer) to function as data transmission control means for transmitting voice data of a predetermined compression format to the communication device 20 as an RTP payload, and the change request transmission control means Then, the information of the access point B and the information related to the connection timing are added as additional information to the audio data of the RTP payload and transmitted by the communication unit 18.
That is, by defining a format in which additional information is optionally added to the normal format data related to voice distribution transmitted from the parent communication device 10 to the communication device 20, the lines are continuously continuously generated at short time intervals. Since information related to switching of the connection destination can be transmitted together in the audio data distribution to be transmitted, communication destination can be easily connected without complicating the communication and suppressing an increase in traffic as much as possible. It is possible to manage access points collectively.

  In addition, such delivery data is data including voice, video, or a combination thereof, and similarly, connection control data is sent along with data continuously and periodically transmitted at short intervals. Thus, while facilitating management, it is possible to effectively prevent the occurrence of skipping or interruption of the voice or video due to the disconnection of the communication during reproduction of the voice or video (video) data in the communication device 20.

  Further, the RTP header is added to the distribution data including the payload of the audio data, and the RTP header includes an RTP payload identifier including information relating to the presence / absence of connection control data added as additional information. Therefore, the communication device 20 confirms the RTP payload identifier by confirming the RTP payload identifier, easily obtains the switching setting of the access point 40 according to the format, and determines the access point connection destination at an appropriate timing. It can be migrated.

  Further, since the data transmission control means causes the communication unit 18 to transmit voice data to the communication device 20 by multicast or broadcast, the connection destination of the communication device 20 is the access point of the connection destination of the parent communication device 10 as described above. By keeping the same as the above, it is possible to easily keep these communication devices in the subnet that is within the transmission range of multicast and broadcast. Therefore, it is possible to transmit the distribution data to the communication device 20 continuously without causing a load on the network by unicast transmission or the like and without causing interruption or jump when switching the connection destination.

In addition, the parent communication device 10 includes the storage unit 15 and stores the list of access points that can be set as the connection destination, so that the parent communication device 10 (computer) can be determined as the access point 40. The connection destination setting unit determines an access point B from the access points 40 included in the candidate list.
Therefore, even when there are a plurality of access points emitting radio waves in the vicinity, only those that can be used easily and promptly are selected, it is judged whether or not it can be set as the connection destination as access point B, and it is set as the connection destination You can do it. In addition, access points that are publicly available but not suitable for connection due to security issues and / or are not suitable for multicast or broadcast data distribution can be excluded from the connection destinations.

  In addition, since the information related to the connection timing includes the standby time until the operation of changing the connection destination to access point B is started, each communication with parent communication device 10 is performed as compared with the case of transmitting date data, etc. There is no need to take into account the time lags counted with the device 20, and the data size can be made smaller compared to the time information.

  Similarly, since the information related to the connection return timing includes the standby time until the operation of changing the connection destination to the carried access point A is started, the standby time as the information related to the connection timing described above and Similar effects can be obtained.

  Further, in the communication device 20, the information on the access point B and the information related to the connection timing to the access point B are received from one predetermined wireless communication device, so the user of another malicious communication device The user is guided to an appropriate connection destination easily without being guided or connected to an inappropriate access point 40 as a connection destination from an access point or the like.

Second Embodiment
Next, a wireless communication system according to a second embodiment of the present invention will be described.
The overall configuration of the wireless communication system 1 of the second embodiment and the functional configurations of the parent communication device 10 and the communication device 20 are the same as the configuration according to the wireless communication system 1 of the first embodiment, and the same reference numerals are used. Description is omitted as it is used.

Next, audio data distribution in the wireless communication system of the second embodiment will be described.
FIG. 8 is a sequence diagram illustrating exchange of data among the master communication device 10, the communication device 20, and the access point 40 in the wireless communication system 1 according to the second embodiment.

  In the wireless communication system 1 of the present embodiment, the CPU 11 (candidate is used when the radio wave from the router of the access point received by the parent communication device 10 (broadcast of beacon or reply to probe request) satisfies the connection standard related to the reception strength. The confirmation transmission control means and the notification request transmission control means cause the communication unit 18 to multicast the information of the access point satisfying the connection standard as the connection transfer destination candidate (candidate confirmation information) along with the voice data as the connection transfer destination candidate (candidate confirmation information). The communication device 20 that has received the information on the connection migration destination candidate acquires the reception strength of radio waves from the router of the access point candidate for the connection migration destination candidate, and confirms that the communication device 20 also satisfies the reception strength criteria. Signal (candidate approval information) indicating that the reception strength is good. This reply may be carried out by being included in the normal UDP / IP (or TCP / IP) payload (IP packet) by unicast transmission to the parent communication device 10. When a reply indicating that the reception strength is good is received from all the communication devices 20, the parent communication device 10 multicast-transmits the connection control data described above together with the voice data to each communication device 20, and access is made after the count time has elapsed. Move points to the change destination.

  Here, when transmitting the information of the connection migration destination candidate, the RTP payload identifier is designated with a number different from the above-mentioned "21" and "22". Here, “23” is designated as the RTP payload identifier, which indicates that, for example, the SSID corresponding to the connection transfer destination candidate access point is inserted in the first 32 bytes of the RTP payload.

  FIG. 9 is a flowchart showing a control procedure by the CPU 11 of the audio data distribution process executed by the parent communication device 10 of the present embodiment.

  This audio data distribution process is the same as the audio data of the first embodiment except that the processes of steps S115 and S116 are additionally inserted between the processes of step S103 and step S105 in the audio data distribution process of the first embodiment. This is the same as the distribution process, and the same processing contents are denoted by the same reference numerals and detailed description thereof is omitted.

  If it is determined in the determination process of step S103 that there is a radio wave received from the access point listed in advance with a reception strength higher than the reference ("YES" in step S103), the CPU 11 selects the radio wave. The access point is set as a connection transfer destination candidate, the RTP payload identifier is set to “23”, and the voice data and the SSID of the connection transfer destination candidate are multicasted to the communication device 20 as an RTP payload (step S115).

  The CPU 11 returns the RTP payload identifier to "21" and transmits frame data using only voice data as the RTP payload, while waiting for a reply related to the reception status from all the communication devices 20, from all the communication devices 20 Is received, it is determined whether or not the reception strength is good in all the communication devices 20 by the reply (step S116). When it is determined that the reception strength is not good in any of the communication devices 20 (“NO” in step S116), the CPU 11 holds the connection transfer destination candidate and shifts the processing to step S104. If it is determined that the reception strengths of all the communication devices 20 are good ("YES" in step S116), the CPU 11 shifts the processing to step S105.

  Here, when it is determined that the reception strength is not good in any of the communication devices 20 in the determination process of step S116, the CPU 11 causes the communication unit 18 to approach the parent communication device 10 with respect to the communication device 20. It is possible to transmit a request (notification request information) for performing a notification operation to be obtained. As the notification operation, a type of operation that can be output from the output unit 27 of the communication device 20 is appropriately set. For example, display may be performed on the display screen, or a preset beep or the like may be output. The type of this operation may be set on the side of the communication device 20 or may be specified on the parent communication device 10. The parent communication device 10 may transmit notification request information to all the communication devices 20.

  For pending connection destination candidates, it is shown that reception strength from all communication devices 20 is good automatically after a predetermined time has passed and / or manually by the user of the parent communication device 10. The manual operation of the user of the parent communication device 10 and / or the inquiry for confirming whether the reception strength is good at predetermined time intervals are repeated until a reply is obtained. Alternatively, the CPU 11 may cancel the connection transfer destination candidate once. In this case, it may be prohibited that this access point is again selected as a candidate for a predetermined time.

FIG. 10 is a flowchart showing a control procedure by the CPU 21 of the audio data reception process executed by the communication device 20 of the present embodiment.
In this voice data reception process, the process of step S152 is replaced with the process of step S152a in the voice data reception process of the first embodiment, and the processes of steps S161 to S163 are added, and the other processes are the same. , It is the same as the audio data reception process of the first embodiment. About the same processing content, the same numerals are attached and detailed explanation is omitted.

  When acquisition of frame data including audio data is started in the process of step S151, the CPU 21 determines whether the RTP payload of the acquired frame data is only audio data, that is, the RTP payload identifier is “21”. It is determined whether or not (step S152a). If it is determined that the data is only voice data ("YES" in step S152a), the process of the CPU 21 proceeds to step S154. Moreover, when the process of step S154 is completed, the process of the CPU 21 returns to step S152a.

  If it is determined that the RTP payload is not only voice data ("NO" in step S152a), the CPU 21 determines whether additional data other than voice data is connection control data, that is, the RTP payload identifier is " It is determined whether or not it is “22” (step S161). If it is determined that the additional data is connection control data ("YES" in step S161), the process of the CPU 21 proceeds to step S156. When the process of step S160 ends, the process of the CPU 21 proceeds to step S152a.

  If it is determined that the additional data is not connection control data (“NO” in step S161), that is, the RTP payload identifier is “23”, the CPU 21 acquires the information of the connection destination candidate, The radio wave from the acquired connection transfer destination candidate is received, and it is determined whether the reception intensity of the radio wave satisfies the reference. Then, the CPU 21 unicasts the determination result to the parent communication device 10 (step S162). In addition, the CPU 21 processes the voice data in the received RTP payload, and reproduces and outputs voice at an appropriate timing (step S163). Then, the process of the CPU 21 returns to step S152a.

As described above, the voice distribution program 150 executed in the parent communication device 10 according to the wireless communication system 1 of the second embodiment is a connection for determining the access point in the control unit (CPU 11) of the parent communication device 10. When an access point B having a reception strength satisfying the criteria is detected, candidate confirmation information inquiring whether the detected access point B satisfies the connection criteria in each of the communication devices 20 is sent to the communication device 20. The CPU 11 functioning as the candidate confirmation transmission control unit to be transmitted by the communication unit 18 and serving as the connection destination setting unit responds to the transmission of the candidate confirmation information, and the access point B detected by the communication device 20 When the candidate approval information indicating that the information is satisfied is received from all of the communication devices 20 by the communication unit 18, this access is Defining a point B as the access point of a connection destination, CPU 11 of the change request transmission control means to transmit the communication unit 18 the information relating to the connection timing of the information of the access point B, and access point B.
Therefore, after confirming that not only the parent communication device 10 but also all the communication devices 20 can be connected to the access point B, the access point of the connection destination is switched. Failure to communicate with the parent communication device 10 can be prevented more reliably, and data transmitted from the parent communication device 10 can be reliably delivered to the communication device 20.
Further, in the case of the access point carried by the access point A before the change, the load on the carried access point can be efficiently and reliably reduced.

In addition, the voice distribution program 150 according to the present embodiment executes a notification operation for requesting the parent communication device 10 to approach the periphery of the parent communication device 10 when the candidate approval information is not received from at least a part of the communication device 20. The communication request unit 18 functions as a notification request transmission control unit that causes the communication unit 18 to transmit at least the candidate approval information of the communication device 20 that does not request notification request information.
Therefore, even when there is a user of the communication device 20 acting too far from the parent communication device 10, the connection destination can be switched to the access point B quickly without a large delay. Moreover, thereby, the user of the communication apparatus 20 can be guided in a desired moving direction.

The present invention is not limited to the above embodiment, and various modifications are possible.
For example, in the above embodiment, in the case of real-time voice transmission using RTP, control data pertaining to the connection destination is included in the RTP data to change the access point to be connected, but separately from RTP data Control data may be transmitted alone. In addition, it may be transmission of not only real-time voice but also moving images (with or without voice). In these cases, data transmission may be performed using a suitable protocol or format. In these cases, the output unit 17 of the communication device 20 is provided with a display screen or the like capable of outputting an image.

  Also, the delivery data may be voice data already recorded. In this case, it may be possible for the user of the parent communication device 10 to appropriately reproduce or pause the voice data.

  In the above embodiment, although the connection destination is switched according to the received radio wave intensity from the access point 40, the parent communication device is based on the position information of the parent communication device 10, the communication device 20, and the access point 40, etc. 10 and the communication device 20 may be determined to be connectable to the access point 40 and the switching control may be performed.

  Further, in the above embodiment, the countdown time until the connection operation to the access point 40 is started is used as data of connection timing, but time information may be used. In this case, it is preferable that the date and time be consistent between the parent communication device 10 and each communication device 20. For example, each device frequently acquires and corrects date and time information from the base station of a mobile phone or the like. Or when the time information of the parent communication device 10 is transmitted to each communication device 20 at the timing when communication between the parent communication device 10 and each communication device 20 is started.

  In the above embodiment, the audio data is multicast or broadcast transmitted to the communication device 20. However, when the number of the communication devices 20 is small or the transmission data is a still image or a text document, Unicast transmission may be performed when transmission is preferable.

  In addition, the reference value of the reception strength as the connection reference to another access point in the modification and the reference value of the reception strength of the connection continuation reference related to the determination when returning to the carried access point are set independently. It may be done. For example, the reference value at return may be set lower than the reference value at connection.

  Further, in the above embodiment, although the parent communication device 10 and the communication device 20 are separately set, all communication devices are equally connected, and among them, setting management of an access point is performed on one communication device. You may Also, setting management of the access point may be performed not on the parent communication device 10 but on a predetermined communication device 20. Further, in the above embodiment, although the voice distribution program 150 for distribution is stored in the parent communication device 10 and the voice reception program 251 is stored in the communication device 20, the voice distribution program 150 and the voice reception program 251 may be included in one program package (application) and both may be stored (installed) in the parent communication device 10 and the communication device 20. The communication control program 151 may be included not only in the voice distribution program 150 but also in the voice reception program 251.

Further, in the above description, as the computer readable medium storing the voice distribution program and the voice receiving program of the present invention, the storage units 15 and 16 formed of a portable external (external) storage medium such as a miniSD card are exemplified. However, the present invention is not limited to this. As other computer readable media, it is possible to apply portable recording media such as a hard disk drive (HDD), a flash memory conforming to various standards, a CD-ROM, and a DVD disc. A carrier wave is also applied to the present invention as a medium for providing program data according to the present invention via a communication line.
In addition, the specific configuration, processing contents, and procedures shown in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

Although some embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and the equivalents thereof. .
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as in the claims attached at the beginning of the application for this application.

[Appendix]
<Claim 1>
Wireless communication means for connecting to a wireless communication relay unit and transmitting and receiving communication data via the relay unit by the wireless communication;
A second relay unit different from the currently connected first relay unit and connection destination setting means for determining a connection timing to the second relay unit based on a predetermined connection standard;
When it is set that the connection destination is changed to the second relay unit at the connection timing, information on the second relay unit and information on the connection timing with respect to another predetermined wireless communication apparatus Change request transmission control means for causing the wireless communication means to transmit
Connection control means for causing the wireless communication means to change the connection destination to the second relay unit at the connection timing determined by the connection destination setting means;
A wireless communication device comprising:
<Claim 2>
When the information on the second relay unit and the information on the connection timing to the second relay unit are received by the wireless communication unit in a state of being connected to the first relay unit, The wireless communication apparatus according to claim 1, further comprising a connection control unit that causes the wireless communication unit to change the connection destination to the second relay unit at a connection timing.
<Claim 3>
Wireless communication means for connecting to a wireless communication relay unit and transmitting and receiving communication data via the relay unit by the wireless communication;
When the information on the second relay unit and the information on the connection timing to the second relay unit are received by the wireless communication unit in the state of being connected to the first relay unit, at the connection timing Connection control means for causing the wireless communication means to change the connection destination to the second relay unit;
A wireless communication device comprising:
<Claim 4>
A wireless communication system comprising a master wireless communication device and a slave wireless communication device that perform wireless communication with each other,
The master wireless communication device may
A first wireless communication unit that connects to a wireless communication relay unit and transmits and receives communication data via the relay unit by wireless communication;
A second relay unit different from the currently connected first relay unit and connection destination setting means for determining a connection timing to the second relay unit based on a predetermined connection standard;
When it is set that the connection destination is changed to the second relay unit at the connection timing, the wireless communication is performed on the information on the second relay unit and the information on the connection timing for the slave wireless communication device. A change request transmission control unit to be transmitted by the unit;
First connection control means for causing the wireless communication means to change the connection destination to the second relay unit at the connection timing determined by the connection destination setting means;
Equipped with
The slave wireless communication device may
A second wireless communication means for transmitting and receiving communication data via the relay unit by wireless communication connected to the relay unit;
In the state of being connected to the first relay unit, the information on the second relay unit and the information on the connection timing to the second relay unit are received from the master wireless communication device by the wireless communication unit. A second connection control unit that causes the wireless communication unit to change the connection destination to the second relay unit at the connection timing;
A wireless communication system comprising:
<Claim 5>
A computer comprising wireless communication means for connecting to a wireless communication relay unit and transmitting and receiving communication data via the relay unit via the wireless communication,
A second relay unit different from the first relay unit currently connected and connection destination setting means for determining a connection timing to the second relay unit based on a predetermined connection standard;
When setting is made to change the connection destination to the second relay unit, the wireless communication is performed on the information on the second relay unit and the information on the connection timing with respect to another predetermined wireless communication apparatus. Change request transmission control means for transmitting by means;
Connection control means for causing the wireless communication means to change the connection destination to the second relay unit at the connection timing determined by the connection destination setting means;
A program characterized by functioning as
<Claim 6>
The computer,
When the information on the second relay unit and the information on the connection timing to the second relay unit are received by the wireless communication unit in a state of being connected to the first relay unit, 6. The program according to claim 5, wherein the program causes the wireless communication unit to function as a connection control unit that changes the connection destination to the second relay unit at a connection timing.
<Claim 7>
A computer comprising wireless communication means for connecting to a wireless communication relay unit and transmitting and receiving communication data via the relay unit via the wireless communication,
When the information on the second relay unit and the information on the connection timing to the second relay unit are received by the wireless communication unit in the state of being connected to the first relay unit, at the connection timing A program that causes the wireless communication unit to function as a connection control unit that changes a connection destination to the second relay unit.
<Claim 8>
The program according to claim 5 or 6, wherein the connection destination setting unit determines the second relay unit based on the radio wave intensity from the relay unit received by the wireless communication unit.
<Claim 9>
The connection destination setting means is characterized in that a relay unit for transmitting a radio wave of the radio wave intensity is determined as the second relay unit when the radio wave intensity exceeds a reference value continuously for a predetermined time or more. The program according to claim 8.
<Claim 10>
The connection destination setting unit determines the first relay unit as a connection destination again when the second relay unit does not satisfy a predetermined connection continuation standard in a state of being connected to the second relay unit. And determine the timing of returning to the first relay unit,
When the change request transmission control means is set to change the connection destination to the first relay unit, the change request transmission control unit transmits the information on the first relay unit and the connection recovery timing to the other wireless communication device. Causing the wireless communication means to transmit such information;
10. The connection control means causes the wireless communication means to change the connection destination to the first relay unit at the connection recovery timing. The method according to any one of claims 5, 6, 8 and 9. Programs.
<Claim 11>
The computer,
Function as data transmission control means for transmitting data of a predetermined format to the other wireless communication device,
The change request transmission control means adds information of the second relay unit and information related to the connection timing as additional information to the data of the predetermined format, and causes the wireless communication means to transmit the data. The program as described in any one of claim 5, 6, 8 to 10.
<Claim 12>
12. The program according to claim 11, wherein the data in the predetermined format is data including audio, moving images, or a combination thereof.
<Claim 13>
13. The program according to claim 11, wherein the predetermined format includes header information related to identification of the presence / absence of the additional information.
<Claim 14>
The data transmission control means causes the wireless communication means to transmit data of the predetermined format to the other wireless communication device by multicast or broadcast. Described program.
<Claim 15>
The computer,
When a relay unit satisfying the connection standard for determining the second relay unit is detected, an inquiry is made as to whether the detected relay unit satisfies the connection standard in each of the other wireless communication devices. Candidate confirmation transmission control means for transmitting candidate confirmation information to the other wireless communication device by the wireless communication means,
Function as
The connection destination setting means, in response to the transmission of the candidate confirmation information, candidate approval information indicating that the relay unit detected by the other wireless communication device satisfies the connection standard is the other by the wireless communication means. Defining the detected relay unit as the second relay unit when received from a wireless communication device;
15. The change request transmission control means causes the wireless communication means to transmit the information on the second relay unit and the information on the connection timing. The program described in.
<Claim 16>
The computer,
When at least a part of the other wireless communication apparatus requests notification information requesting execution of a notification operation for requesting to approach the computer when the candidate approval information is not received from at least a part of the other wireless communication apparatus 16. The program according to claim 15, wherein the program is made to function as a notification request transmission control unit that causes the wireless communication unit to transmit approval information that has not been transmitted.
<Claim 17>
Causing the computer to function as a storage unit that holds a candidate list of relay units that can be defined as the second relay unit;
The program according to any one of claims 5, 6, 8 to 16, wherein the connection destination setting unit determines the second relay unit from the relay units included in the candidate list.
<Claim 18>
The information according to the connection timing includes a standby time until the operation of changing the connection destination to the second relay unit is started. program.
<Claim 19>
The program according to claim 10, wherein the information related to the connection return timing includes a waiting time until an operation of changing the connection destination to the first relay unit is started.
<Claim 20>
8. The program according to claim 6, wherein the information on the second relay unit and the information on connection timing to the second relay unit are received from one predetermined wireless communication apparatus. .

1 Wireless Communication System 10 Parent Communication Device 11 CPU
12 ROM
13 RAM
14 input / output interface 15 storage unit 150 voice distribution program 151 communication control program 16 input unit 161 operation unit 162 microphone 17 output unit 171 voice output unit 18 communication unit 19 bus 20 communication device 21 CPU
22 ROM
23 RAM
24 Input / output interface 25 Storage unit 251 Audio reception program 26 Input unit 261 Operation unit 262 Microphone 27 Output unit 271 Audio output unit 28 Communication unit 29 Bus 40 Access point

Claims (5)

Wireless communication means for transmitting and receiving communication data with the first wireless communication device, the second wireless communication device, and the third wireless communication device;
Connection destination setting means for determining a connection timing to the second wireless communication device different from the currently connected first wireless communication device based on a predetermined connection standard;
When the setting to change the connection destination to the second wireless communication device is performed at the connection timing, a change request to cause the wireless communication unit to transmit information related to the connection timing to the third wireless communication device Transmission control means,
A wireless communication device comprising:   The wireless communication according to claim 1, further comprising connection control means for causing the wireless communication means to change the connection destination to the second wireless communication device at the connection timing determined by the connection destination setting means. apparatus.   The change request transmission control unit is configured to change the connection destination to the second wireless communication device at the connection timing, and the second wireless communication device may transmit the third wireless communication device to the second wireless communication device. The wireless communication device according to claim 1, wherein the wireless communication unit transmits information related to the connection timing and information related to the connection timing. A computer comprising wireless communication means for transmitting and receiving communication data to and from the first wireless communication device, the second wireless communication device, and the third wireless communication device;
Connection destination setting means for determining connection timing to the second wireless communication device different from the first wireless communication device currently connected based on a predetermined connection standard;
Change request transmission control means for causing the wireless communication means to transmit information related to the connection timing to the third wireless communication device when setting is made to change the connection destination to the second wireless communication device;
A program characterized by functioning as A wireless communication method comprising wireless communication means for transmitting and receiving communication data to and from a first wireless communication device, a second wireless communication device, and a third wireless communication device,
A connection destination setting step of determining a connection timing to the second wireless communication device different from the currently connected first wireless communication device based on a predetermined connection standard;
A change request transmission control step of causing the wireless communication unit to transmit information related to the connection timing to the third wireless communication device when setting is made to change the connection destination to the second wireless communication device;
A wireless communication method comprising:

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