KR101878626B1 - A wireless communication apparatus, a wireless communication method, and a wireless communication program - Google Patents

Abstract

The wireless communication parent device 111 has a first communication timing at a timing for receiving a wireless frame from the wireless communication child devices 131 and 132 wirelessly connected to the wireless communication parent device 111, Sets a second communication timing, which is a timing for receiving a radio frame from the wireless communicating child device (133) wirelessly connected to the wireless communication device (112), and receives the wireless frame. When the wireless communication parent device 111 receives the wireless frame from the wireless communication child device 133 at the second communication timing, the wireless communication parent device 111 transmits the connection destination of the wireless connection of the wireless communication child device 133 to the wireless communication parent And performs control to switch to the device 111.

Description

A wireless communication apparatus, a wireless communication method, and a wireless communication program

The present invention relates to handover of wireless communication.

In a communication system of an industrial device, a device called a master station notifies a device called a plurality of slave stations of the control amount of the industrial device and repeats the notification of the state of the industrial device from the plurality of slave stations to the master station.

In this specification, the time from when the master station notifies a plurality of slave stations of the control amount to when the master station receives notification of status from all of the slave stations is called cycle time.

If the cycle time is short, it is possible to improve the production efficiency by the industrial device and the operation precision of the industrial device.

Conventionally, in a communication system of an industrial device, devices are connected by wire, but in recent years, expectation for wireless communication has been increasing due to ease of layout change and wire saving.

Considering the convenience of users, it is desirable to realize a radio system of Industry-Science-Medical (ISM) band, which is a frequency band in which a license is unnecessary.

Among wireless systems of the ISM band, a wireless LAN (Local Area Network) system of the IEEE 802.11 standard capable of high-speed communication is likely to be applied.

However, in a mobile communication, when switching is performed between a base station and a child device, a packet error occurs when it takes time to switch.

On the other hand, in Patent Document 1, a method of fast handover of a wireless LAN is shown.

According to the technique of Patent Document 1, high-speed handover can be realized by reducing the number of access points to be connected among a plurality of existing access points of a handover candidate based on the connection history.

(Prior art document)

(Patent Literature)

(Patent Document 1) JP-A-2009-49922

However, when high-speed communication is required, such as a communication system of an industrial device, wireless communication is frequently performed in a handover destination (handover destination) (switching destination of a wireless connection) .

Therefore, there is a problem that the handover is not completed until the radio communication is completed in the radio communication apparatus which is the handover destination and a long time is required until the handover is completed.

The main object of the present invention is to solve the above-mentioned problems, and its main object is to obtain a configuration in which a wireless communication terminal can switch a wireless connection connection destination at a high speed.

A wireless communication apparatus according to the present invention is a wireless communication apparatus that includes a first communication timing which is a timing for receiving a radio frame from a first wireless communication terminal that is wirelessly connected to a corresponding wireless communication apparatus among a plurality of wireless communication terminals, A second communication timing which is a timing for receiving a radio frame from a second radio communication terminal that is wirelessly connected to another radio communication apparatus other than the radio communication apparatus among the plurality of radio communication terminals, And a switching unit configured to perform control to switch a wireless connection connection destination of the second wireless communication terminal when the wireless reception unit receives a wireless frame from the second wireless communication terminal at the second communication timing And a control unit.

According to the present invention, since the radio communication apparatus performs the switching control at the point of time when the radio frame is received from the second radio communication terminal, the connection destination of the radio connection of the second radio communication terminal can be switched at high speed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing an example of a configuration of a wireless communication system according to a first embodiment; Fig.
2 is a diagram showing an outline of a functional configuration of a wireless communication parent device according to Embodiment 1. Fig.
3 is a diagram showing an outline of a functional configuration of a wireless communication child device according to the first embodiment;
4 is a flowchart showing an outline of the operation of the wireless communication parent device according to the first embodiment;
5 is a flowchart showing an outline of the operation of the wireless communication child device according to the first embodiment;
6 is a flowchart showing an outline of the operation of the wireless communication child device according to the first embodiment;
7 is a diagram showing details of the functional configuration of the wireless communication parent device according to the first embodiment;
8 is a diagram showing details of a functional configuration of a wireless communication child device according to the first embodiment;
9 is a diagram showing an example of a parent device management table of the wireless communication parent device 111 according to the first embodiment;
10 is a diagram showing an example of a parent device management table of a wireless communication parent device 112 according to the first embodiment;
11 is a diagram showing an example of a child device management table of a wireless communication child device 131 according to the first embodiment;
12 is a diagram showing an example of a child device management table of the wireless communication child device 132 according to the first embodiment;
13 is a diagram showing an example of a child device management table of the wireless communication child device 133 according to the first embodiment;
14 is a diagram showing an example of a communication schedule between the wireless communication parent device 111 and the wireless communication child devices 131 to 133 according to the first embodiment;
15 is a diagram showing an example of a communication schedule between the wireless communication parent device 112 and the wireless communication child devices 132, 133 according to the first embodiment;
16 is a diagram showing an example of a transmission timing of a response frame to the wireless communication parent device 111 by the wireless communication child device 133 according to the first embodiment;
17 is a diagram showing an example of transmission timing of a disconnection frame to the wireless communication parent device 112 by the wireless communication child device 133 according to the first embodiment;
18 is a diagram showing an example of a hardware configuration of a wireless communication parent device and a wireless communication child device according to the first embodiment;

Embodiment Mode 1.

*** Description of system configuration ***

Fig. 1 shows an example of the configuration of a wireless communication system according to the present embodiment.

1, in the wireless communication system according to the present embodiment, a plurality of wireless communication parent devices 111 and a wireless communication parent device 112 are connected to the L2SWs 141 and 142 to the master station 101, As shown in FIG.

The L2SW 141 and the L2SW 142 are layer 2 switches.

The wireless communication child devices 131 and 132 are wirelessly connected to the wireless communication parent device 111 and the wireless communication child device 133 is wirelessly connected to the wireless communication parent device 112. [

In other words, the wireless communication child devices 131 and 132 establish a connection with the wireless communication parent device 111, respectively, and the wireless communication child device 133 establishes a connection with the wireless communication parent device 112 have.

The slave station 121 includes a wireless communication child device 131. The slave station 122 includes a wireless communication child device 132. The slave station 123 includes a wireless communication child device 133, Respectively.

Among the wireless communication child devices, the wireless communication child device 131 is a fixed station, and the wireless communication child devices 132 and 133 are mobile stations.

As described above, in the wireless communication system according to the present embodiment, the wireless communication parent device 111 and the wireless communication parent device 112 are connected to one master station 101 by wire.

The wireless communication parent device 111 and the wireless communication parent device 112 operate at different radio frequencies.

One or more wireless communication child devices are wirelessly connected to the wireless communication parent device 111 and the wireless communication parent device 112, respectively.

The wireless communication parent device and the wireless communication child device communicate with the CSMA / CA (Carrier Sense Multiple Access with Collision Detection).

In addition, one slave station is wired to the wireless communication child device.

The wireless communication parent device 111 and the wireless communication parent device 112 correspond to a wireless communication device, respectively.

The wireless communication child devices 131 to 133 correspond to wireless communication terminals, respectively.

The wireless communication child devices 131 and 132 are wirelessly connected to the wireless communication parent device 111 and correspond to the first wireless communication terminal in the wireless communication parent device 111. [

The wireless communication child device 133 is wirelessly connected to the wireless communication parent device 112 and corresponds to the second wireless communication terminal in the wireless communication parent device 111. [

On the other hand, in the wireless communication parent device 112, since the wireless communication child device 133 is wirelessly connected to the wireless communication parent device 112, it corresponds to the first wireless communication terminal.

The wireless communication child devices 131 and 132 correspond to the second wireless communication terminal in the wireless communication parent device 112 because they are wirelessly connected to the wireless communication parent device 111. [

The wireless communication parent device 111 is a wireless communication parent device that is a connection destination of wireless connection of the wireless communication child device 131 or 132 and is a parent device of the wireless communication child device 131 or 132 do.

The wireless communication parent device 112 is a wireless communication parent device that is a switching destination of the wireless connection of the wireless communication child device 131 or 132 and is connected to the switching destination wireless communication device in the wireless communication child device 131 or 132 .

On the other hand, since the wireless communication parent device 112 is the wireless communication parent device that is the connection destination of the wireless connection of the wireless communication child device 133, the wireless communication child device 133 corresponds to the current wireless communication device.

The wireless communication parent device 111 corresponds to the switching destination wireless communication device in the wireless communication child device 133 since it is the wireless communication parent device that is the switching destination of the wireless connection of the wireless communication child device 133. [

The wireless communication child device 131, which is a fixed station, corresponds to a fixed wireless communication terminal, and the wireless communication child devices 132 and 133, which are mobile stations, correspond to a mobile wireless communication terminal.

*** Outline of function configuration ***

Next, an outline of the functional configuration of the wireless communication parent device 111 and the wireless communication parent device 112 will be described.

Fig. 2 shows an overview of the functional configuration of the wireless communication parent device 111 and the wireless communication parent device 112. Fig.

The radio transmission unit 21 transmits a communication frame by wireless communication.

A communication frame transmitted / received by wireless communication is called a wireless frame.

On the other hand, a communication frame transmitted / received by wired communication is called a wired frame.

The radio transmission unit 21 transmits a response request frame which is a radio frame requesting a response.

Hereinafter, the response request frame is also referred to as a broadcast frame in order to explain an example in which the wireless transmission unit 21 broadcasts a response request frame.

The wireless transmission unit 21 may multicast the response request frame.

The wireless receiving unit 22 receives a wireless frame responding to the broadcast frame transmitted by the wireless transmitting unit 21 from the wireless communication child devices 131 to 133. [

The wireless frame received by the wireless receiving unit 22 from the wireless communication subunits 131 to 133 as a response to the response request frame is hereinafter referred to as a response frame.

The wireless receiving unit 22 sets the first communication timing, which is the timing for receiving the response frame from the first wireless communication terminal, and the second communication timing, which is the timing for receiving the response frame from the second wireless communication terminal , And receives a response frame.

More specifically, the wireless receiving unit 22 receives n first communication timings for receiving response frames from n (n? 1) first wireless communication terminals, m (m? 1) Repeats a communication cycle including m second communication timings for receiving a response frame from the communication terminal, and receives the response frame.

As described above, in the wireless communication parent device 111, the wireless communication child devices 131 and 132 correspond to the first wireless communication terminal and the wireless communication child device 133 corresponds to the second wireless communication terminal ( n = 2, m = 1).

The wireless receiving unit 22 of the wireless communication parent device 111 receives the response frame from the wireless communication child devices 131 and 132 at the first communication timing, Lt; / RTI > is the second communication timing.

On the other hand, in the wireless communication parent device 112, the wireless communication child device 133 corresponds to the first wireless communication terminal and the wireless communication child devices 131 and 132 correspond to the second wireless communication terminal (n = 1 , m = 2).

The wireless receiving unit 22 of the wireless communication parent device 112 has the first communication timing at which the response frame is received from the wireless communication child device 133 and the wireless communication child device 131, Lt; / RTI > is the second communication timing.

The process performed by the wireless receiving unit 22 is also referred to as wireless receiving process.

The switching control section 23 performs control to switch the connection destination of the wireless connection of the second wireless communication terminal when the wireless receiving section 22 receives the response frame from the second wireless communication terminal at the second communication timing .

In other words, in the wireless communication parent device 111, when the wireless receiving unit 22 receives the response frame from the wireless communication child device 133 at the second communication timing, the switching control unit 23 controls the wireless communication child And performs control to switch the connection destination of the wireless connection of the device 133 from the wireless communication parent device 112 to the wireless communication parent device 111. [

When the wireless receiving section 22 receives a response frame from the wireless communication child device 131 (or the wireless communication child device 132) at the second communication timing, the wireless communication parent device 112 performs switching The control unit 23 performs control for switching the connection destination of the wireless connection of the wireless communication child device 131 (or the wireless communication child device 132) from the wireless communication parent device 111 to the wireless communication parent device 112 I do.

The process performed by the switching control section 23 is also referred to as a switching control process.

Next, an outline of the functional configuration of the wireless communication child devices 131 to 133 according to the present embodiment will be described.

Fig. 3 shows an outline of the functional configuration of the wireless communication child devices 131 to 133 according to the present embodiment.

The wireless receiving unit 31 repeatedly receives the broadcast frame from the current wireless communication device which is the connection destination of the current wireless connection.

The wireless receiving unit 31 of the wireless communication child devices 131 and 132 repeatedly receives a broadcast frame from the wireless communication parent device 111 which is a current wireless communication device.

The wireless receiving unit 31 of the wireless communication child device 133 repeatedly receives the broadcast frame from the wireless communication parent device 112 which is the current wireless communication device.

The radio receiving unit 31 also receives a broadcast frame from the switching destination radio communication apparatus, which is the switching destination of the radio connection, when switching of the connection destination of the radio connection is required.

The case where the connection destination of the wireless connection is required to be switched is, for example, a case where the reception power of the radio frame from the current radio communication apparatus is lower than the threshold value.

For example, when it is necessary to switch the connection destination of the wireless connection, the wireless receiving unit 31 of the wireless communication child devices 131 and 132 receives the broadcast frame from the wireless communication parent device 112 which is the switching destination wireless communication device do.

The wireless receiving unit 31 of the wireless communication child device 133 receives the broadcast frame from the wireless communication parent device 111 which is the switching destination wireless communication device when the connection destination of the wireless connection is required to be switched.

The communication timing detection unit 32 detects the arrival of the current communication timing, which is a timing for repeatedly arriving at a radio frame to be transmitted to the current radio communication apparatus.

More specifically, the communication timing detection unit 32 detects the arrival of the current communication timing based on the time when the radio reception unit 31 has received the radio frame from the current radio communication apparatus.

The communication timing detection unit 32 also detects the arrival of the switching destination communication timing, which is the timing for transmitting the radio frame to the switching destination radio communication apparatus, which is repeated when the connection destination of the radio connection is required to be switched.

More specifically, the communication timing detection unit 32 detects the arrival of the switching destination communication timing based on the time when the radio reception unit 31 received the radio frame from the switching destination radio communication apparatus.

The first communication timing and the second communication timing described above are the classification of the communication timing recognized by the wireless communication parent devices 111 and 112 and the current communication timing and the switching destination communication timing are the same as the communication timing of the wireless communication child device 131 To 133).

For example, the communication timing assigned by the wireless communication child device 131 to transmit the response frame to the wireless communication parent device 111 is recognized as the first communication timing by the wireless communication parent device 111, The device 131 is recognized as the current communication timing.

On the other hand, the communication timing assigned by the wireless communication child device 133 to transmit the response frame to the wireless communication parent device 111 is recognized as the second communication timing by the wireless communication parent device 111, In the device 133, it is recognized as the switching destination communication timing.

The processing performed by the communication timing detection unit 32 is also referred to as communication timing detection processing.

The wireless transmission unit 33 transmits a response frame to the current wireless communication device at the current communication timing detected by the communication timing detection unit 32. [

The radio transmission unit 33 transmits a response frame to the switching destination radio communication device at the switching destination communication timing detected by the communication timing detection unit 32 when switching of the connection destination of the radio connection is required.

When the response frame is transmitted by the wireless transmission unit 33 at the switching destination communication timing, the switching destination wireless communication apparatus starts the operation of switching the connection destination of the wireless connection when receiving the response frame.

The processing performed by the wireless transmission unit 33 is also referred to as wireless transmission processing.

*** Outline of operation ***

Next, an overview of the operations of the wireless communication parent devices 111 and 112 shown in Fig. 2 will be described.

Fig. 4 is a flowchart showing an outline of the operations of the wireless communication parent devices 111 and 112. Fig.

Hereinafter, the operation of the wireless communication parent device 111 will be described as an example, but the operation of the wireless communication parent device 112 is also the same as that shown below.

In the following description, the wireless communication parent device 111 transmits a response request frame (broadcast frame) and then receives reception of a response frame from the wireless communication child devices 131 and 132, which are the first wireless communication terminals, And waits for the reception of a response frame from the wireless communication child device 133 which is the second wireless communication terminal.

The procedure shown in Fig. 4 corresponds to a wireless communication method and an example of a wireless communication program.

When the transmission timing of the response request frame arrives, the wireless transmission unit 21 broadcasts the response request frame (S401).

Next, the wireless receiving unit 22 determines the type of the current communication timing (S402).

If the current communication timing is the first communication timing, that is, the timing at which the response frame is received from the first wireless communication terminal, the wireless receiving unit 22 performs the process of S403.

On the other hand, if the current communication timing is the second communication timing, that is, the timing of receiving the response frame from the second wireless communication terminal, the wireless receiving unit 22 performs the process of S408.

In step S403, the wireless receiving unit 22 determines whether or not a response frame is received from the first wireless communication terminal.

When receiving the response frame (YES in S403), the wireless receiving unit 22 transmits the received frame to the element (not shown in Fig. 2) that performs processing for the response frame in the wireless communication parent apparatus 111 And transmits a response frame (S404).

On the other hand, when the response frame is not received (NO in S403), the wireless transmission unit 21 retransmits the response request frame (S405).

If the response frame is not received even when the first communication timing is ended (YES in S406), the wireless receiving unit 22 performs error processing (S407).

In the error processing, the wireless receiving unit 22 notifies the element (not shown in FIG. 2) managing the status of the wireless communication child device in the wireless communication parent device 111 that the response frame is not received do.

In step S408, the wireless receiving unit 22 determines whether or not a response frame is received from the second wireless communication terminal.

When the response frame is not received (NO in S408), the wireless receiving unit 22 performs the operation of S410.

On the other hand, when the response frame is received in the second communication timing (YES in S408), the wireless receiving unit 22 notifies the switching control unit 23 of the wireless communication child device of the transmission of the response frame, (S409).

1, when the wireless receiving section 22 of the wireless communication parent device 111 receives a response frame from the wireless communication child device 133 at the second communication timing, the wireless communication parent device 111 Performs processing for switching the connection destination of the wireless connection of the wireless communication child device 133 from the wireless communication parent device 112 to the wireless communication parent device 111. [

In S410, the radio receiving unit 22 determines whether there is an unprocessed communication timing.

When there is an unprocessed communication timing (YES in S410), the radio receiving section 22 performs the operation after S402 with respect to the unprocessed communication timing.

If there is no unprocessed communication timing (NO in S410), the wireless transmission unit 21 transmits a response request frame (S401).

Next, an outline of operations of the wireless communication child devices 131 to 133 shown in Fig. 3 will be described.

Figs. 5 and 6 are flowcharts showing an outline of operations of the wireless communication child devices 131 to 133. Fig.

5 is a flowchart showing an operation when each wireless communication child device transmits a response frame to a wireless communication parent device (current wireless communication device), which is a connection destination of the current wireless connection.

Fig. 6 shows an operation when each wireless communication child device transmits a response frame to the wireless communication parent device (the switching destination wireless communication device), which is the switching destination, in order to switch the wireless communication parent device as the connection destination of the wireless connection It is a flowchart.

5 and 6 correspond to examples of a wireless communication method and a wireless communication program.

5, when the wireless receiving unit 31 receives the response request frame transmitted from the wireless communication parent device that is the connection destination of the wireless connection (Yes in S501), the communication timing detecting unit 32 determines the communication timing ) Has arrived (S502).

The communication timing detection section 32 determines that the communication timing has arrived at the time when the prescribed waiting time elapses from the reception time of the response request frame.

When the communication timing arrives (YES in S502), the wireless transmission unit 33 transmits a response frame to the response request frame to the wireless communication parent device, which is a wireless connection connection destination (S503).

In the wireless communication child devices 131 and 132, the wireless receiving unit 31 receives a response request frame broadcast-transmitted from the wireless communication parent device 111 (S501).

In the wireless communication child device 131, when the communication time detection section 32 determines that the waiting time specified in the wireless communication child device 131 has elapsed from the reception time of the response request frame, It is determined that the communication timing has arrived (YES in S502).

Then, the wireless transmission unit 33 transmits a response frame to the wireless communication parent device 111 (S503).

Likewise, in the wireless communication child device 132, when the communication time detection section 32 determines that the wireless communication child device 132 (the wireless communication child device 132) ) Has arrived (YES in S502).

Then, the wireless transmission unit 33 transmits a response frame to the wireless communication parent device 111 (S503).

Further, in the wireless communication child device 133, the wireless receiving unit 31 receives a response request frame broadcast-transmitted from the wireless communication parent device 112 (S501).

In the wireless communication child device 133, the communication timing detection unit 32 detects the wireless communication child device 133 at a point of time when the waiting time defined in the wireless communication child device 133 has elapsed from the reception time of the response request frame It is determined that the communication timing has arrived (YES in S502).

Then, the wireless transmission unit 33 transmits a response frame to the wireless communication parent device 112 (S503).

6, when it is necessary to switch the wireless communication parent device (YES in S601), the wireless receiving unit 31 determines the wireless communication parent device which is the switching destination of the wireless connection (S602).

When the wireless receiving unit 31 receives the response request frame from the wireless communication parent device as the switching destination (Yes in S603), the communication timing detecting unit 32 determines whether or not the communication timing (switching destination communication timing) has arrived (S604).

The communication timing detection section 32 determines that the communication timing has arrived at the time when the prescribed waiting time elapses from the reception time of the response request frame.

When the communication timing comes (YES in S604), the wireless transmission unit 33 transmits a response frame to the response request frame to the wireless communication parent device, which is the switching destination (S605).

In the wireless communication child devices 131 and 132, when the wireless communication parent device is required to be switched (YES in S601), the wireless receiving unit 31 transmits the wireless communication switching destination to the wireless communication parent device 112 And receives a response request frame broadcast-transmitted from the wireless communication parent device 112, which is the switching destination (S602, S603).

In the wireless communication child device 131, when the communication time detection section 32 determines that the waiting time specified in the wireless communication child device 131 has elapsed from the reception time of the response request frame, It is determined that the communication timing has come (Yes in S604).

Then, the wireless transmission unit 33 transmits a response frame to the wireless communication parent device 112 (S605).

Likewise, in the wireless communication child device 132, when the communication time detection section 32 determines that the wireless communication child device 132 (the wireless communication child device 132) ) Has arrived (YES in S604).

Then, the wireless transmission unit 33 transmits a response frame to the wireless communication parent device 112 (S605).

In the wireless communication child device 133, when the wireless communication parent device is required to be switched (YES in S601), the wireless receiving unit 31 transmits the wireless communication switching destination to the wireless communication parent device 111 And receives a response request frame broadcast-transmitted from the wireless communication parent device 111, which is the switching destination (S602, S603).

In the wireless communication child device 133, the communication timing detection unit 32 detects the wireless communication child device 133 at a point of time when the waiting time defined in the wireless communication child device 133 has elapsed from the reception time of the response request frame It is determined that the communication timing has come (Yes in S604).

Then, the wireless transmission unit 33 transmits a response frame to the wireless communication parent device 111 (S605).

*** Detailed explanation of function configuration ***

Next, the functional configuration of the wireless communication parent devices 111 and 112 will be described in detail.

Fig. 7 shows details of the functional configuration of the wireless communication parent devices 111 and 112. Fig.

In the following, description will be made as the functional configuration of the wireless communication parent device 111, but the following description also applies to the wireless communication parent device 112. [

7, the parent device management table 201 manages the identification information of the mobile station of the wireless communication child device in the wireless communication system, the identification information of the fixed station connected to the wireless communication parent device 111, and the communication timing and connection status .

The wired frame receiving unit 202 receives the wired frame.

The wired frame analyzing unit 203 analyzes the wired frame received by the wired frame receiving unit 202 and determines whether the wired frame received by the wired frame receiving unit 202 is a wired frame from the master station 101, It is determined whether or not it is a wire frame from the communication parent device 112. [

In the case of a wired frame from the master station 101, the wired frame analyzing unit 203 notifies the wireless frame creating unit 204 of the data included in the wired frame.

In the case of a wired frame from another wireless communication parent device 112, the wired frame analysis unit 203 notifies the connection management unit 210 of the data included in the wired frame.

The wireless frame creation unit 204 creates a wireless frame for notifying the wireless communication child device of the data notified from the wired frame analysis unit 203. [

Further, the radio frame creation unit 204 creates a radio frame that is instructed to be retransmitted from the retransmission instruction unit 212.

The radio frame transmission unit 205 transmits the radio frame created by the radio frame creation unit 204 by radio.

Further, the radio frame transmission unit 205 notifies the communication timing control unit 211 of the timing of transmitting the radio frame.

The radio frame receiving unit 206 receives a radio frame from the radio communication child device.

The wireless frame analyzing unit 207 analyzes the wireless frame received by the wireless frame receiving unit 206 and determines whether the wireless frame received by the wireless frame receiving unit 206 is a wireless frame from which wireless communication child device do.

The radio frame analyzing unit 207 notifies the communication timing control unit 211 that no radio frame is received when the radio frame receiving unit 206 has not received the radio frame.

When the wireless frame analyzing unit 207 receives a wireless frame from the wireless communication child device wirelessly connected to the wireless communication parent device 111, the wireless frame analyzing unit 207 transmits data included in the wireless frame to the wired frame creating unit 208 ).

When the wireless frame analyzing unit 207 receives the wireless frame from the wireless communication child device wirelessly connected to the wireless communication parent device 111, the wireless communication child device that transmits the wireless frame is connected to the connection management unit 210 ).

The wired frame creating unit 208 creates a wired frame for notifying the master station 101 of the data notified from the radio frame analyzing unit 207. [

The wired frame creating unit 208 creates a wired frame for notifying another wireless communication parent device 112 of a change in the connection status of the wireless communication child device based on an instruction from the connection management unit 210 do.

The wired frame transmission unit 209 transmits the wired frame created by the wired frame creation unit 208 by the wire.

The connection management unit 210 updates the connection status managed in the parent device management table 201 based on the data notified from the wired frame analysis unit 203 and the data notified from the wireless frame analysis unit 207 .

Further, the connection management unit 210 notifies the communication timing control unit 211 of the connection state after the update

The communication timing control section 211 generates communication timing for each wireless communication child device based on the transmission timing notified from the wireless frame transmission section 205. [

The communication timing control section 211 instructs the retransmission instruction section 212 to retransmit the radio frame when the radio communication child device 131 or the wireless communication child device 132 does not receive the radio frame.

The retransmission instruction unit 212 instructs the radio frame creation unit 204 to retransmit the radio frame when a retransmission instruction is issued from the communication timing control unit 211. [

7, the radio frame creation unit 204 and the radio frame transmission unit 205 correspond to the radio transmission unit 21 shown in FIG.

That is, the radio frame creation unit 204 generates a response request frame, and the radio frame transmission unit 205 transmits a response request frame.

The radio frame reception unit 206, radio frame analysis unit 207 and communication timing control unit 211 correspond to the radio reception unit 22 shown in Fig.

That is, the radio frame reception unit 206 receives the response frame, and the radio frame analysis unit 207 determines from which radio communication child device the response frame received by the radio frame reception unit 206 is transmitted.

Further, the communication timing control section 211 determines whether the current communication timing is the first communication timing or the second communication timing.

The connection management unit 210 corresponds to the switching control unit 23 shown in Fig.

That is, the connection management unit 210 updates the connection status managed in the parent device management table 201, thereby switching the connection destination of the wireless connection of the second wireless communication child device.

Next, the functional configurations of the wireless communication child devices 131 to 133 will be described in detail.

Fig. 8 shows details of the functional configurations of the wireless communication child devices 131 to 133. Fig.

In Fig. 8, the child device management table 301 manages the identification information, the connection state, and the communication timing of the wireless communication parent device of the connection candidate in the wireless communication system.

The wired-line frame receiving unit 302 receives the wired frame from the slave station.

The wireless frame creation unit 303 creates a wireless frame for notifying the data included in the wired frame received by the wired frame receiving unit 302. [

Further, when the response control section 308 is instructed to transmit a response, the radio frame creation section 303 creates a radio frame for notifying the response.

The radio frame transmission unit 304 wirelessly transmits the radio frame created by the radio frame creation unit 303. [

The radio frame transmission unit 304 switches the frequency for transmitting the radio frame when the radio frequency switching unit 309 instructs the switching of the frequency.

The radio frame reception unit 305 receives a radio frame from the radio communication parent device.

The radio frame reception unit 305 also transmits the received radio frame to the radio frame analysis unit 306. [

The radio frame reception unit 305 also notifies the response control unit 308 of the reception power of the radio frame.

The radio frame reception unit 305 also switches the frequency at which the radio frame is received when the radio frequency switching unit 309 instructs the switching of the frequency.

The radio frame analyzing unit 306 analyzes the radio frame transmitted from the radio frame receiving unit 305 and determines whether to notify the slave station of the data included in the radio frame.

When notifying the slave station of the data included in the radio frame, the data is notified to the wire-frame transmitting unit 307.

If the wireless frame analyzing unit 306 determines that the wireless frame is a response request frame from the wireless communication parent device as a result of analyzing the wireless frame transmitted from the wireless frame receiving unit 305, And notifies the response control unit 308 of the reception.

The wired frame transmission unit 307 transmits a wired frame for notifying the slave station of the data notified from the radio frame analysis unit 306. [

The response control unit 308 detects the arrival of the communication timing assigned to the wireless communication child device when there is a notification from the wireless frame analysis unit 306 that the response request frame is received from the wireless communication parent device .

Then, the response control section 308 instructs the radio frame creation section 303 to transmit a response when detecting the arrival of the communication timing.

The response control unit 308 determines whether or not the frequency switching is necessary based on the received power notified from the radio frame receiving unit 305. If the frequency switching is necessary, Indicates the switching of the frequency.

The radio frequency switching section 309 instructs the radio frame transmitting section 304 to switch the transmission frequency of the radio frame based on an instruction to switch the frequency from the response control section 308, And instructs switching of the reception frequency of the radio frame.

8, the radio frame reception unit 305 and the radio frequency switching unit 309 correspond to the radio reception unit 31 shown in Fig.

That is, the radio frame reception unit 305 receives a radio frame from the radio communication parent device, which is the connection destination of the current radio connection.

When it is necessary to switch the wireless communication parent device, the radio frequency switching unit 309 controls the switching of the reception frequency to search for the wireless communication parent device, which is the switching destination of the wireless connection, 305 receives a radio frame from the wireless communication parent device, which is the switching destination of the wireless connection.

The response control section 308 corresponds to the communication timing detection section 32 shown in Fig.

That is, the response control unit 308 detects the arrival of the communication timing for transmitting the radio frame to the wireless communication parent device, which is the connection destination of the current wireless connection.

The response control unit 308 detects the arrival of the communication timing for transmitting the radio frame to the wireless communication parent device, which is the switching destination of the wireless connection, when switching of the wireless communication parent device is required.

The radio frame transmission unit 304 and the radio frequency switching unit 309 correspond to the radio transmission unit 33 shown in Fig.

That is, the radio frequency switching unit 309 switches the transmission frequency to the wireless communication parent device (wireless communication switching device), which is the switching destination of the wireless connection, so that the wireless frame transmission unit 304 can transmit the wireless frame to the wireless communication parent device, .

Then, at the timing of communication with the wireless communication parent device, which is the switching destination of the wireless connection detected by the response control unit 308, the wireless frame transmission unit 304 transmits a wireless frame to the wireless communication parent device .

Next, the parent device management table 201 shown in FIG. 7 is referred to.

The parent device management table 201 includes wireless communication child device type, wireless communication child device identification information, communication timing, and connection state.

The category of the wireless communication child device type indicates the type of the wireless communication child device whether it is a mobile station or a fixed station.

In the column of the wireless communication child device identification information, the identification information of the wireless communication child device is shown.

In the column of the connection status, whether or not the wireless communication child device is wirelessly connected is indicated.

In the column of the communication timing, the timing at which the wireless communication child device transmits the response frame to the response request frame transmitted by the wireless communication parent device is shown, as described above.

The transmission order of the response frame is specified in each wireless communication child device and the communication timing of each wireless communication child device can be calculated from the transmission order of the response frame if the response frame transmitted by all the wireless communication child devices is fixed length .

In addition, when the response frame length differs according to the wireless communication child device, the wireless communication timing of each wireless communication child device can be calculated from the time required for transmission of each response frame.

Hereinafter, it is assumed that the response frame transmitted by all the wireless communication child devices is fixed length, and the communication timing of each wireless communication child device is calculated from the transmission sequence of the response frame.

In the column of the communication timing of the parent device management table 201, the transmission order of the response frame of the wireless communication child device is described.

Fig. 9 shows an example of the parent device management table 201 of the wireless communication parent device 111. Fig.

Since the wireless communication child devices 131 and 132 are connected to the wireless communication parent device 111 at present, the connection state with the wireless communication child devices 131 and 132 is the connection, the connection state with the wireless communication child device 133 Is not connected.

Fig. 10 shows an example of the parent device management table 201 of the wireless communication parent device 112. Fig.

Since the wireless communication child device 133 is currently connected to the wireless communication parent device 112, the connection state with the wireless communication child device 133 is disconnected and the connection state of the wireless communication child device 132 is not connected .

Since the wireless communication child device 131 is a fixed station connected to the wireless communication parent device 111, information of the wireless communication child device 131 is not included in the parent device management table of the wireless communication parent device 112 .

11 shows an example of the child device management table 301 of the wireless communication child device 131. Fig.

12 shows an example of the child device management table 301 of the wireless communication child device 132. As shown in Fig.

Fig. 13 shows an example of the child device management table 301 of the wireless communication child device 133. Fig.

Since the wireless communication child device 131 is a fixed station, in FIG. 11, only the wireless communication parent device 111 is a connection candidate.

On the other hand, since the wireless communication child devices 132 and 133 are mobile stations, the connection candidates are the wireless communication parent device 111 and the wireless communication parent device 112 in FIG. 12 and FIG.

Since the wireless communication child device 132 is connected to the wireless communication parent device 111, the connection state with the wireless communication parent device 111 is connected and the connection state with the wireless communication parent device 112 is not connected.

Since the wireless communication child device 133 is connected to the wireless communication parent device 112, the connection status with the wireless communication parent device 111 is not connected, and the connection status with the wireless communication parent device 112 is connection to be.

*** Detailed explanation of operation ***

Next, details of the operation of the wireless communication parent device shown in Fig. 7 and the wireless communication child device shown in Fig. 8 will be described.

First, in accordance with the example of the communication schedule shown in Fig. 14, the wireless communication parent device 111 and the wireless communication child devices 131 to 133 (response request frame) when the wireless communication parent device 111 transmits a broadcast frame Will be described.

14, in the time slot 901, the wireless communication parent device 111 transmits a broadcast frame (response request frame), and in the time slot 902, the wireless communication child device 132 transmits a response frame To the wireless communication parent device 111 and in the timeslot 904 the wireless communication child device 131 transmits a response frame to the wireless communication parent device 111. [

The time slot 903 is the communication timing for the wireless communication child device 133 to transmit the response frame to the wireless communication parent device 111. The wireless communication child device 133, The wireless communication child device 133 does not transmit the response frame to the wireless communication parent device 111 in the time slot 903 because the wireless communication child device 133 is normally connected (when switching of the connection destination of the wireless connection is unnecessary).

14, the timeslot 902 indicates a time slot 902 in which the wireless communication parent device 111 transmits communication timings for receiving a response frame from the wireless communication child device 132 wirelessly connected to the wireless communication parent device 111 And corresponds to the first communication timing.

The time slot 902 is a communication timing for transmitting the response frame to the wireless communication parent device 111 that is the connection destination of the current wireless connection by the wireless communication child device 132 and corresponds to the current communication timing.

The time slot 903 is a communication timing for the wireless communication parent device 111 to receive a response frame from the wireless communication child device 133 wirelessly connected to the wireless communication parent device 112, Timing.

The time slot 903 is a communication timing for transmitting the response frame to the wireless communication parent device 111, which is the switching destination of the wireless connection by the wireless communication child device 133, and corresponds to the switching communication timing.

The time slot 904 is a communication timing for the wireless communication parent device 111 to receive a response frame from the wireless communication device 131 wirelessly connected to the wireless communication parent device 111, Timing.

The time slot 904 is a communication timing for transmitting the response frame to the wireless communication parent device 111, which is the connection destination of the current wireless connection, by the wireless communication child device 131, and corresponds to the current communication timing.

First, the procedure of transmitting the broadcast frame (response request frame) by the wireless communication parent device 111 in the time slot 901 will be described.

In the wireless communication parent device 111, the wired frame receiving unit 202 receives the broadcast frame transmitted from the master station 101 via wired communication.

Next, the wired frame analyzing unit 203 analyzes the broadcast frame, and the wireless frame creating unit 204 creates a wireless frame (response request frame).

Then, the radio frame transmission unit 205 wirelessly transmits a radio frame (response request frame) created by the radio frame creation unit 204. [

At this time, the radio frame transmission unit 205 notifies the communication timing control unit 211 of the transmission timing of the radio frame (response request frame).

The communication timing control section 211 controls the transmission timing of the radio frame (response request frame) notified from the radio frame transmission section 205 and the transmission timing described in the column of the communication timing of the parent device management table 201 (FIG. 9) The communication timing for receiving the response frame is generated for each wireless communication child device.

Then, the communication timing control section 211 waits for reception of a response frame from the wireless communication child device.

Next, a procedure for transmitting the response frame in the time slot 902 by the wireless communication device 132 connected to the wireless communication parent device 111 will be described.

In the wireless communication child device 132, the wireless frame receiving unit 305 receives a wireless frame (response request frame) from the wireless communication parent device 111 in the time slot 901. [

The radio frame analyzing unit 306 analyzes the radio frame received by the radio frame receiving unit 305 and transmits the data included in the radio frame to the wire frame transmitting unit 307. [

The wired frame transmission unit 307 transmits a wired frame including data included in the wireless frame to the slave station 122. [

The radio frame analyzing unit 306 also notifies the response control unit 308 that the radio frame has been received.

The response control unit 308 refers to the child device management table 301 (Fig. 10), and when the communication timing described in the child device management table 301 arrives, the response control unit 308 causes the wireless frame creation unit 303 to generate a response frame .

The response control unit 308 determines whether or not the transmission order described in the column of the communication timing of the child device management table 301 is set to the transmission order based on the reception time of the radio frame (response request frame) from the wireless communication parent device 111 Detects the arrival of the communication timing of the wireless communication child device (132).

The radio frame creation unit 303 creates a response frame and the radio frame transmission unit 304 wirelessly transmits a response frame to the radio communication parent device 111. [

As a result, the wireless communication child device 132 transmits a response frame to the wireless communication parent device 111 in the time slot 902 in Fig.

When receiving the radio frame, the radio frame receiving unit 305 notifies the response control unit 308 of the reception power of the radio frame. Here, the response control unit 308 determines that the reception power of the radio frame is sufficiently large And determines that switching of the wireless connection destination is unnecessary.

The wireless communication child device 133 is not connected to the wireless communication parent device 111 and the reception frequency of the wireless frame receiving unit 305 of the wireless communication child device 133 is not connected to the wireless communication parent device 111, Of the frequency.

For this reason, the wireless communication child device 133 does not receive the wireless frame (response request frame) from the wireless communication parent device 111 in the time slot 901.

For this reason, the wireless communication child device 133 does not transmit the response frame to the wireless communication parent device 111 in the time slot 903.

The wireless communication child device 131 performs the same operation as the wireless communication child device 132 and the wireless communication child device 131 transmits a response frame to the wireless communication parent device 111 in the time slot 904 .

Next, the operation when the wireless communication parent device 111 receives a response frame from the wireless communication child device will be described.

In the wireless communication parent device 111, the wireless frame receiving unit 206 receives a response frame from the wireless communication device 132 in the time slot 902. [

The wireless frame analyzing unit 207 analyzes the response frame received by the wireless frame receiving unit 206 to recognize that the response frame is received from the wireless communication child device 132. [

The wireless frame analyzing unit 207 notifies the communication timing control unit 211 that the response frame is received from the wireless communication child device 132. [

The communication timing control section 211 confirms that the response frame from the wireless communication child device 132 can be received in the time slot 902 and waits for the reception of the response frame of the wireless communication child device 133 .

When the radio frame receiver 206 can not receive a response frame from the radio communication child device 132 in the timeslot 902, the communication timing controller 211 sends a retransmission instruction to the retransmission commander 212 It is notified that the response frame from the child device 132 could not be received.

Then, the retransmission instruction unit 212 notifies the wireless frame creation unit 204 to retransmit the response request frame to the wireless communication child device 132. [

The wireless frame creation unit 204 outputs the response request frame to the wireless frame transmission unit 205 and the wireless frame transmission unit 205 re-transmits the response request frame to the wireless communication child device 132 by unicast.

As described above, since the wireless communication child device 133 is currently connected to the wireless communication parent device 112, the response frame is not transmitted in the time slot 903.

Therefore, in the time slot 903, the wireless communication parent device 111 does not receive the response frame.

Since the communication timing control section 211 does not receive the response frame in the time slot 903, the communication timing control section 211 refers to the parent device management table 201. [

The communication timing control unit 211 determines that the wireless communication child device 133 to which the time slot 903 is allocated is not connected to the wireless communication parent device 111 by referring to the parent device management table 201 Check.

The communication timing control unit 211 then determines to not transmit the response request frame to the wireless communication child device 133 and waits for the reception of the response frame of the next wireless communication child device 131. [

In the wireless communication parent device 111, the wireless frame receiving unit 206 receives a response frame from the wireless communication device 131 in the time slot 904. [

Since the operation of the wireless communication parent device 111 in the time slot 904 is the same as that of the wireless communication parent device 111 in the time slot 902, a description thereof will be omitted.

Next, in accordance with an example of the communication schedule shown in Fig. 15, when the wireless communication parent device 112 transmits the broadcast frame (response request frame), the wireless communication parent device 112 and the wireless communication child device 131- 133 will be described.

15, in the time slot 1001, the wireless communication parent device 112 transmits a broadcast frame (response request frame), and in the time slot 1003, the wireless communication child device 133 transmits a response frame To the wireless communication parent device (112).

The time slot 1002 is the communication timing for the wireless communication child device 132 to transmit the response frame to the wireless communication parent device 112 but the wireless communication child device 132 is the wireless communication parent device 111, The wireless communication child device 132 does not transmit a response frame to the wireless communication parent device 112 in the time slot 1002 because the wireless communication child device 132 normally connects to the wireless communication parent device 112 when the connection destination of the wireless connection is unnecessary.

Since the wireless communication child device 131 is a fixed station wirelessly connected to the wireless communication parent device 111 and is not wirelessly connected to the wireless communication parent device 112, The communication timing for the wireless communication child device 131 is not set.

Therefore, the wireless communication parent device 112 does not cause a delay caused by waiting for a response frame from the wireless communication child device 131. [

15, the timeslot 1002 is a time slot 1002 in which the wireless communication parent device 112 has a communication timing for receiving a response frame from the wireless communication child device 132 wirelessly connected to the wireless communication parent device 111 And corresponds to the second communication timing.

The time slot 1002 is a communication timing for transmitting the response frame to the wireless communication parent device 112, which is the switching destination of the wireless communication child device 132, and corresponds to the switching communication timing.

The time slot 1003 is a communication timing for the wireless communication parent device 112 to receive a response frame from the wireless communication child device 133 wirelessly connected to the wireless communication parent device 112, 1 communication timing.

The time slot 1003 is a communication timing for transmitting the response frame to the wireless communication parent device 112, which is the connection destination of the current wireless connection, by the wireless communication child device 133, and corresponds to the current communication timing.

The operation when the wireless communication parent device 112 receives the response frame from the wireless communication child device 133 in the timeslot 1003 is the same as the operation in the case where the wireless communication parent device 111 is the time slot 902 Is the same as the operation when the response frame from the wireless communication child device 132 is received.

The operation when the wireless communication parent device 112 does not receive the response frame from the wireless communication child device 133 in the timeslot 1003 is the same as the operation of the wireless communication parent device 111 in the time slot 902 does not receive a response frame from the wireless communication child device 132. [

Next, an operation of the wireless communication child device 133 to handover from the wireless communication parent device 111 to the wireless communication parent device 112 will be described.

In the wireless communication child device 133, when the reception power of the response request frame from the wireless communication parent device 112 is notified from the wireless frame reception unit 305, the response control unit 308 sets the notified reception power to a threshold value Compare.

When the reception power of the response request frame from the wireless communication parent device 112 is lower than the threshold value, the response control section 308 determines that the wireless frame transmission section 304 and the wireless frame reception section 305 are not performing communication The radio frequency switching unit 309 is instructed to search for another wireless communication parent device.

The radio frequency switching unit 309 sequentially switches the reception frequency of the radio frame reception unit 305. [

When the wireless frame receiving unit 305 receives the response request frame from the wireless communication parent device 111 with a reception power equal to or higher than the threshold value, the wireless communication child device 133 responds to the wireless communication parent device 111 The wireless frame transmission unit 304 transmits a response frame to the wireless communication parent device 111 at the communication timing for transmitting the frame.

16 shows a communication schedule when the wireless communication child device 133 transmits a response frame to the wireless communication parent device 111. Fig.

16, a time slot 1101 is a communication timing for the wireless communication parent device 111 to transmit a response request frame.

The time slot 1102 is a communication timing for the wireless communication child device 132 to transmit the response frame to the wireless communication parent device 111. [

The time slot 1103 is a communication timing for the wireless communication child device 133 to transmit a response frame to the wireless communication parent device 111. [

The time slot 1104 is a communication timing for the wireless communication child device 131 to transmit a response frame to the wireless communication parent device 111. [

The wireless communication child device 133 transmits the connection destination of the wireless connection from the wireless communication parent device 112 to the wireless communication parent device 111 by transmitting a response frame to the wireless communication parent device 111 in the time slot 1103. [ And switches to the device 111.

At this time, the response control unit 308 of the wireless communication child device 133 changes the connection state of the child device management table 301 to the wireless communication parent device 111 and the wireless communication parent device 112 to the unconnected state do.

When the wireless communication parent device 111 receives the response frame from the wireless communication child device 133 in the time slot 1103, the wireless frame analysis device 306 transmits the response frame to the wireless communication child device (133) to the connection management unit (210).

The connection management unit 210 changes the connection status of the wireless communication child device 133 of the parent device management table 201 to connection.

The connection management unit 210 also creates a connection notification frame for notifying the wireless communication parent device 112 that the wireless communication child device 133 has connected to the wireless communication parent device 111 via the wired frame creation unit 208 ).

The wired frame creating unit 208 creates a connection notification frame.

Then, the wired frame transmission unit 209 broadcasts a connection notification frame.

The connection management section 210 also instructs the L2SW 141 and 142 to learn the path of the unicast frame of the wireless communication child device 133 by transmitting the dummy frame of the wireless communication child device 133 to the wired- (208) and a wired frame transmission unit (209).

Alternatively, the connection management unit 210 may transmit a wired frame in which the connection notification frame and the dummy frame are integrated.

In the wireless communication parent device 112, the wired frame receiving unit 202 receives the connection notification frame transmitted from the wireless communication parent device 111. [

The wired frame analyzing unit 203 analyzes the connection notification frame and determines that the connection notification frame is a wired frame from the wireless communication parent device 111. [

The wired frame analyzing unit 203 notifies the connection management unit 210 of the data included in the connection notification frame (data indicating that the wireless communication child device 133 is connected to the wireless communication parent device 111) .

The connection management unit 210 changes the connection status of the wireless communication child device 133 of the parent device management table 201 to unconnected.

The connection management unit 210 notifies the communication timing control unit 211 that the wireless communication child device 133 is not connected to the wireless communication parent device 112. [

The communication timing control section 211 notifies the wireless communication child device 133 of the response request frame even though the wireless communication child device 133 has been notified that the wireless communication child device 133 is not connected, The retransmission instruction unit 212 does not instruct the retransmission instruction unit 212 to retransmit the data.

*** Explanation of effects of the embodiment mode ***

As described above, in this embodiment, in addition to the communication timing for receiving a response frame from the wireless communication child device connected to the wireless communication parent device, the wireless communication parent device is connected to another wireless communication parent device A communication timing for receiving a response frame from the wireless communication child device is provided.

Therefore, according to the present embodiment, the wireless communication parent device can perform the switching control at the time of receiving the response frame from the wireless communication child device connected to the other wireless communication parent device, and can perform the handover at high speed Can be completed.

***bookkeeping***

In the above description, the wireless communication child device 133 refers to a procedure for transmitting a response frame to the wireless communication parent device 111, which is the switching destination of the wireless connection.

Instead of this, the wireless communication child device 133 may send a response frame to the wireless communication parent device 111 after transmitting the disconnection frame to the wireless communication parent device 112.

When the reception power of the response request frame received from the wireless communication parent device 112 falls below the threshold value, the radio frequency switching unit 309 of the wireless communication device 133 sets the reception frequency of the radio frame reception unit 305 To search for another wireless communication parent device.

When the received power from the wireless communication parent device 111 is stronger than the wireless communication parent device 112, the response control section 308 of the wireless communication child device 133 transmits a response frame to the wireless communication parent device 112 Creates a cut frame in the radio frame creation unit 303 at the communication timing for transmission, and transmits the cut frame to the radio frame transmission unit 304. [

17 shows a communication schedule when the wireless communicating child device 133 transmits the disconnection frame to the wireless communication parent device 112. Fig.

In Fig. 17, a time slot 1201 is a communication timing for the wireless communication parent device 112 to transmit a response request frame.

The time slot 1202 is a communication timing for the wireless communication child device 132 to transmit the response frame to the wireless communication parent device 112.

The time slot 1203 is a communication timing for the wireless communication child device 133 to transmit the response frame to the wireless communication parent device 112. [

The wireless communication child device 133 transmits the disconnection frame to the wireless communication parent device 112 in the time slot 1203.

The cut frame is a radio frame requesting the wireless communication parent device 112 to switch the wireless connection to the wireless communication parent device 111. [

After the transmission of the cut frame, the radio frequency switching unit 309 transmits the transmission frequency of the radio frame transmission unit 304 and the reception frequency of the radio frame reception unit 305 to the wireless communication parent device 111, To the frequency that is used.

Then, the response control section 308 waits for reception of the radio frame from the wireless communication parent device 111. [

In the wireless communication parent device 112 that has received the disconnection frame from the wireless communication child device 133, the connection management section 210 does not connect the wireless communication child device 133 of the parent device management table 201 to the unconnected .

The connection management unit 210 also notifies the wireless communication parent device 111 of the handover notification of the handover of the wireless communication child device 133 via the wired frame creation unit 208 and the wired frame transmission unit 209 Frame.

When the wireless communication parent device 111 receives the handover notification frame from the wireless communication parent device 112, the connection management unit 210 determines whether or not the connection of the wireless communication child device 133 of the parent device management table 201 State as a connection.

The connection management unit 210 notifies the communication timing control unit 211 that the wireless communication child device 133 should not retransmit the response request frame to the wireless communication child device 133 when there is no response frame from the wireless communication child device 133 .

The connection management section 210 also instructs the L2SW 141 and 142 to learn the path of the unicast frame of the wireless communication child device 133 by connecting the dummy frame, which is the wireless communication child device 133, (208) and a wired frame transmission unit (209).

The connection management unit 210 notifies the wireless frame generation unit 204 of the wireless communication child device 133 that the wireless communication child device 133 is connected to the wireless communication parent device 111, Instructs the creation of a dummy frame in the future.

The wireless frame creation unit 204 creates a dummy frame based on an instruction from the connection management unit 210 and the wireless frame transmission unit 205 transmits the dummy frame to the wireless communication child device 133 in unicast.

As described above, the wireless communication child device notifies the wireless communication parent device, which is currently connected, to disconnect the wireless connection and to notify the wireless communication parent device which is the destination of the wireless connection switching.

In this case as well, the retransmission control of the wireless communication child device can be performed by the wireless communication parent device which is the handover destination, so that the frame reaching rate in the wireless communication parent device as the handover destination is improved.

*** Explanation of examples of hardware configuration ***

Finally, an example of the hardware configuration of the wireless communication parent devices 111 and 112 and the wireless communication child devices 131 to 133 will be described with reference to FIG.

The wireless communication parent devices 111 and 112 and the wireless communication child devices 131 to 133 are computers.

The wireless communication parent devices 111 and 112 and the wireless communication child devices 131 to 133 include a processor 1901, an auxiliary memory device 1902, a memory 1903, a communication device 1904, an input interface 1905, And hardware such as a display interface 1906.

The processor 1901 is connected to the other hardware through the signal line 1910 and controls these other hardware.

The input interface 1905 is connected to the input device 1907.

The display interface 1906 is connected to the display 1908.

The processor 1901 is an IC (Integrated Circuit) that performs processing.

The processor 1901 is, for example, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a GPU (Graphics Processing Unit).

The auxiliary storage device 1902 is, for example, a ROM (Read Only Memory), a flash memory, and a HDD (Hard Disk Drive).

The memory 1903 is, for example, a RAM (Random Access Memory).

The communication device 1904 includes a receiver 19041 for receiving data and a transmitter 19042 for transmitting data.

The communication device 1904 is, for example, a communication chip or a NIC (Network Interface Card).

The input interface 1905 is a port to which the cable 1911 of the input device 1907 is connected.

Display interface 1906 is the port to which cable 1912 of display 1908 is connected.

The input device 1907 and the display 1908 are, for example, touch panels.

In the auxiliary memory device 1902, a program for realizing the functions of " to " shown in Figs. 2, 3, 7, and 8 is stored.

This program is loaded into the memory 1903, read by the processor 1901, and executed by the processor 1901. [

In the auxiliary memory device 1902, an OS (Operating System) is also stored.

Then, at least a part of the OS is loaded into the memory 1903, and the processor 1901 executes a program for realizing the functions of " part " while executing the OS.

18 shows one processor 1901, the wireless communication parent devices 111 and 112 and the wireless communication child devices 131 to 133 may have a plurality of processors 1901. [

A plurality of processors 1901 may execute a program that realizes functions of " part " in conjunction with each other.

Further, information, data, signal values, and variable values indicating the results of the processing of "to" are stored in the memory 1903, the auxiliary memory device 1902, or a register or cache memory in the processor 1901.

A program for realizing the functions of " part " is stored in a storage medium such as a magnetic disk, a flexible disk, an optical disk, a compact disk, a Blu-ray (registered trademark) disk, or a DVD.

May be provided as a " processing circuit tree ".

Also, the " part " may be replaced with a " circuit " or " process "

Circuit " and " processing circuit tree " refer not only to the processor 1901, but also to other types of processing circuitry, such as logic ICs or GA arrays, or ASICs (Field Programmable Gate Arrays) It is a concept to include.

21:
22:
23:
31:
32: Communication timing detector
33: radio transmission unit
101: Master station
111: Wireless communication parent device
112: wireless communication parent device
121: Slave station
122: Slave station
123: Slave station
131: Wireless communication child device
132: Wireless communication child device
133: Wireless communication child device
141: L2SW
142: L2SW
201: Parent Device Management Table
202: wired frame receiver
203: Wire frame analysis section
204: radio frame creation unit
205: radio frame transmitter
206: radio frame receiver
207: Radio frame analyzing unit
208: wired frame creation unit
209: Wired frame transmitter
210:
211: Communication timing control section
212:
301: Child Device Management Table
302: wired frame receiver
303: Radio frame creation section
304: radio frame transmitter
305: Radio frame receiver
306: Radio frame analyzing unit
307: Wired frame transmission unit
308:
309: radio frequency switching section

Claims (15)

1. A wireless communication device,
The first mobile radio communication timing being a timing for receiving a radio frame from a first mobile radio communication terminal which is a mobile radio communication terminal wirelessly connected to the radio communication apparatus among a plurality of radio communication terminals, Which is a timing for receiving a radio frame from a second mobile radio communication terminal which is a mobile radio communication terminal wirelessly connected to another radio communication apparatus other than the radio communication apparatus, A first fixed wireless communication timing, which is a timing for receiving a radio frame from a first fixed wireless communication terminal that is a fixed wireless communication terminal wirelessly connected to the wireless communication apparatus among the terminals, 2 mobile wireless communication timing is ahead of the first fixed wireless communication timing And a wireless receiver configured to set the lock, and receiving a radio frame,
And a switching control unit which performs control to switch the connection partner of the wireless connection of the second mobile communication terminal when the radio receiver receives the radio frame from the second mobile radio communication terminal at the second mobile radio communication timing,
.
The method according to claim 1,
Wherein the radio receiving unit receives the first mobile radio communication timing by the number of the first mobile radio communication terminals, the second mobile radio communication timing by the number of the second mobile radio communication terminals, And the first fixed wireless communication timing is included as many times as the number of the first fixed wireless communication timings.
The method according to claim 1,
When the radio receiver receives the radio frame from the second mobile radio communication terminal at the second mobile radio communication timing, the switching control unit switches the radio communication connection partner of the second mobile radio communication terminal to the other And switches from the radio communication apparatus to the radio communication apparatus.
The method according to claim 1,
The radio communication apparatus further includes a radio transmission unit for transmitting a response request frame which is a radio frame requesting a response before the first mobile radio communication timing and the second mobile radio communication timing are started,
Wherein the wireless receiving unit receives from the first mobile wireless communication terminal a response frame that is a wireless frame responding to the response request frame at the first mobile wireless communication timing, 2 mobile wireless communication terminal does not receive the response frame from the second mobile wireless communication terminal but does not receive the response frame from the second mobile wireless communication terminal, And when the switching is necessary, receiving the response frame from the second mobile communication terminal
Wireless communication device.
5. The method of claim 4,
The radio transmission unit does not retransmit the response request frame even when the radio receiving unit does not receive the response frame from the second mobile radio communication terminal at the second mobile radio communication timing, And the retransmission of the response request frame is performed when the radio receiver does not receive the response frame from the first mobile communication terminal.
The method according to claim 1,
When the radio receiver receives from the first mobile radio communication terminal a radio frame requesting switching of a radio communication connection partner in the first mobile radio communication timing, And controls switching of the connection partner of wireless connection of the wireless communication terminal.
The method according to claim 1,
Wherein the radio receiving unit does not set a timing for receiving a radio frame from a second fixed radio communication terminal which is a fixed radio communication terminal wirelessly connected to the other radio communication apparatus among the plurality of radio communication terminals.
A wireless communication device, which is a computer,
The first mobile radio communication timing being a timing for receiving a radio frame from a first mobile radio communication terminal which is a mobile radio communication terminal wirelessly connected to the radio communication apparatus among a plurality of radio communication terminals, Which is a timing for receiving a radio frame from a second mobile radio communication terminal which is a mobile radio communication terminal wirelessly connected to another radio communication apparatus other than the radio communication apparatus, A first fixed wireless communication timing, which is a timing for receiving a radio frame from a first fixed wireless communication terminal that is a fixed wireless communication terminal wirelessly connected to the wireless communication apparatus among the terminals, 2 mobile wireless communication timing is ahead of the first fixed wireless communication timing The lock set, to receive a radio frame,
When the radio frame is received from the second mobile radio communication terminal at the second mobile radio communication timing, performs control to switch the radio communication connection partner of the second mobile radio communication terminal
Wireless communication method.
A wireless communication device, which is a computer,
The first mobile radio communication timing being a timing for receiving a radio frame from a first mobile radio communication terminal which is a mobile radio communication terminal wirelessly connected to the radio communication apparatus among a plurality of radio communication terminals, Which is a timing for receiving a radio frame from a second mobile radio communication terminal which is a mobile radio communication terminal wirelessly connected to another radio communication apparatus other than the radio communication apparatus, A first fixed wireless communication timing, which is a timing for receiving a radio frame from a first fixed wireless communication terminal that is a fixed wireless communication terminal wirelessly connected to the wireless communication apparatus among the terminals, 2 mobile wireless communication timing is ahead of the first fixed wireless communication timing Radio receiving processing to set the lock, and receiving a radio frame, and,
A switching control process for performing control to switch the connection partner of the wireless connection of the second mobile communication terminal when a radio frame is received from the second mobile radio communication terminal at the second mobile radio communication timing
In the recording medium. delete delete delete delete delete delete

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