JP6103903B2 - Wireless communication device - Google Patents

Description

  The present invention relates to a radio communication apparatus of a multi-channel access method that can optimally set frequency channels and eliminate communication delays.

  Multi-channel access wireless communication is a method in which a plurality of wireless communication devices jointly use a plurality of frequency channels (communication channels) to perform communication, and local communication between various electronic devices in an office, home, or the like. It can be used not only for wireless communication but also for wireless communication between short-distance or long-distance wireless stations (fixed stations or mobile stations).

  In the multi-channel access method, when a wireless communication device receives a communication request from a partner to be communicated by sequentially receiving a plurality of frequency channels in order to establish communication, it is used with the partner wireless communication device. After setting possible frequency channels, this setting state is maintained, and when the communication is terminated, the setting state is canceled (Patent Document 1).

  In such a wireless communication device, when the transmission-side wireless communication device (transmission unit) transmits communication data to the reception-side wireless communication device (reception unit), in addition to the data packet including the communication data, In order to avoid the occurrence of a no-signal state in the blank period that occurs between transmissions, a dummy packet including dummy data is transmitted.

  However, a communication error occurs when the receiving unit cannot receive a data packet due to interference with a wireless communication device that is not the counterpart or noise. When the receiving unit cannot receive a data packet for a certain time due to such a communication error, a predetermined procedure for changing the frequency channel (frequency channel changing operation) is performed on the transmitting side and the receiving unit. However, since communication data cannot be transmitted until the frequency channel changing operation is completed, a communication delay occurs.

JP 2000-134215 A

  Therefore, in order to solve the above problems, the present invention eliminates communication delays by reducing the influence of communication errors due to noise in the wireless transmission path and interference, and optimally controlling the frequency channel change. The task was to improve the reliability of data transmission.

In order to solve the above-described problem, when the wireless communication apparatus according to the present invention transmits communication data from a transmission unit to a reception unit, the transmission unit transmits a reference packet including first data information, and then transmits a second packet. In addition to having a configuration for transmitting a data packet including data information, and when the receiving unit receives at least one of the transmitted reference packet and data packet, the receiving unit receives the frequency channel set in the wireless communication device. that it has a structure that maintains the reception without changing.

  The wireless communication apparatus having such a configuration does not cause a communication delay because the frequency channel change operation is not performed if at least one of the reference packet and the data packet is received.

When both the reference packet and the data packet are received, the receiving unit determines whether or not the data information included in both packets matches. When the data information included in both packets matches, the receiving unit includes the data packet. It captures the second data information, when the data information contained in both the packet do not match, that have a discard constituting the second data information in the data packet.

  The wireless communication apparatus having such a configuration discards the second data information when the received first data information and the second data do not match, thereby avoiding erroneous communication and control, Reliability as wireless communication is improved.

Whether or not the data information included in both packets matches is determined by determining the first data information included in the reference packet stored in the storage unit included in the receiving unit and the second data included in the data packet. Ru done by comparing the data information.

  The wireless communication apparatus according to the present invention having the above-described configuration can reduce the influence of communication errors due to noise or interference in the wireless transmission path, can appropriately control the frequency channel change, eliminate the communication delay, The reliability of data transmission can be improved.

It is a figure which shows schematic structure of the radio | wireless communication apparatus concerning this invention. 2A illustrates a schematic configuration of a transmitter included in the transmission unit of the wireless communication apparatus illustrated in FIG. 1, and FIG. 2B illustrates a schematic configuration of a terminal included in the reception unit. FIG. 3A shows a schematic configuration of a reference packet transmitted and received by the wireless communication apparatus shown in FIG. 1, and FIG. 3B similarly shows a schematic configuration of a data packet. 4A shows a communication procedure when communication is normally performed in the wireless communication apparatus shown in FIG. 1, FIG. 4B shows a communication procedure when a communication error occurs in the data packet, FIG. 4C shows a communication procedure when a communication error occurs in the reference packet. 3 is a flowchart showing processing operations in a terminal included in a receiving unit of the wireless communication apparatus shown in FIG.

  Hereinafter, a wireless communication apparatus according to the present invention will be described with reference to the drawings.

<Schematic configuration of wireless communication device>
FIG. 1 is a diagram showing a schematic configuration of a wireless communication device 1 according to the present invention. The wireless communication device 1 includes a transmission unit 10 and a reception unit 20. The transmitter 10 includes a transmitter 11, transmitters 11 </ b> A... Transmitter 11 </ b> N, and the receiver 20 includes a terminal 21. The transmitting unit 10 transmits communication data by any of a plurality of transmitters (transmitter 11, transmitter 11A... Transmitter 11N) (hereinafter, any transmitter among the plurality of transmitters is referred to as transmitter 11n). May be written.) The terminal 21 of the receiving unit 20 receives the communication data by setting the reception frequency channel to the frequency channel through which the transmitter 11n transmits data.

  When the terminal 21 cannot receive communication data for a certain period of time or when reception is hindered by noise generated in the wireless communication transmission path, the terminal 21 controls a predetermined procedure for changing the frequency channel to be received ( Frequency channel change operation).

<Schematic configuration of transmitter>
A schematic configuration of the transmitter 11 is shown in FIG. The transmitter 11 includes a first transmission / reception unit 31, a first control circuit unit 32, and an operation unit 33. The first control circuit unit 32 includes a reference packet generation unit 34 and a data packet generation unit 35. (The same applies to the transmitters 11A,... 11N). The first transmitting / receiving unit 31 transmits the reference packet Pr (FIG. 3A) and the data packet Pd (FIG. 3B), and is transmitted from the terminal 21 of the receiving unit 20 (FIG. 2B). ACK is received.

  The reference packet Pr including the header, the data information (first data information) D1 and the checksum is generated by the reference packet generator 34. The data packet Pd including the header, the data information (second data information) D2 and the checksum is generated by the data packet generator 35. The operation unit 33 (for example, a keyboard key switch or a mouse switch) receives data by an external operation and sends the input data to the first control circuit unit 32. Therefore, the transmitter 11 can transmit data based on an external operation to the receiving unit 20.

<Schematic configuration of receiver>
A schematic configuration of the receiving unit 20 is shown in FIG. The receiving unit 20 includes a second transmitting / receiving unit 41, a second control circuit unit 42, and a data processing unit 43, and the second control circuit unit 42 includes a storage unit 44 and a determination unit 45. The second transmission / reception unit 41 receives the reference packet Pr and the data packet Pd, and returns (transmits) ACK to the transmission unit 10.

  The storage unit 44 stores data information D1 included in the reference packet Pr. The determination unit 45 determines whether or not the data information D1 stored in the storage unit 44 is the same as the data information D2 included in the data packet Pd. The data processing unit 43 takes in the data information determined by the second control circuit unit 42 and performs a desired process.

<Schematic configuration of communication data>
FIG. 3A is a diagram showing a schematic configuration of the reference packet Pr transmitted and received by the wireless communication apparatus 1, and FIG. 3B is a diagram showing a schematic configuration of the data packet Pd. The reference packet Pr is composed of reference data as a header, data information D1 including data bytes 0 to N, and a checksum. The reference packet Pr is transmitted in the order of header, data information D1, and checksum. The data packet Pd is composed of header data, data information D2 including data bytes 0 to N, and a checksum. The reference packet Pr is transmitted in the order of header, data information D2, and checksum.

<< About the communication procedure >>
FIG. 4 is a diagram illustrating a procedure of wireless communication performed between the transmission unit 10 and the reception unit 20 of the wireless communication device 1. 4A shows a communication procedure when communication is normally performed without causing a communication error, and FIG. 4B shows a communication procedure when a communication error occurs in communication of the data packet Pd. FIG. 4C shows a communication procedure when a communication error occurs in the communication of the reference packet Pr.

<When communication is performed normally>
When communication is normally performed (FIG. 4A), first, the reference packet Pr is transmitted from the transmitter 11n of the transmission unit 10 (step S21). The receiving unit 20 that has correctly received the reference packet Pr returns an ACK indicating that the reference packet Pr has been correctly received to the transmitting unit 10 (step S22).

  When the transmission unit 10 receives ACK, the transmission unit 10 determines that the reception unit 20 has correctly received the reference packet Pr and transmits the data packet Pd (step S23). The receiving unit 20 that has correctly received the data packet Pd returns an ACK indicating that the data packet Pd has been correctly received to the transmitting unit 10 (step S24).

  As described above, when communication is normally performed, the determination unit 45 included in the terminal 21 of the reception unit 20 compares the data information D1 included in the reference packet Pr with the data information D2 included in the data packet Pd. The

  As a result of the comparison, when both pieces of data information match, the data processing unit 43 of the terminal 21 of the receiving unit 20 takes in the data and performs a predetermined process. That is, communication data is correctly transmitted between the transmission unit 10 and the reception unit 20, and a desired operation / control based on data input to the operation unit 33 of the transmitter 11n is performed (data information D1 and data information). The reliability of the communication data is improved by comparing with D2.)

  If the two pieces of data information do not match, the data information D2 is discarded, and the data information D1 included in the reference packet Pr is used for reference only (used only for comparison between the data information D1 and the data information D2). . In this case, erroneous communication and control can be avoided, and hardware abnormality such as a storage unit failure can be detected, so that reliability as wireless communication is improved.

<When a communication error occurs during data packet transmission>
In the communication between the transmission unit 10 and the reception unit 20, the communication procedure when a communication error occurs in the transmission of the data packet Pd is as follows (FIG. 4B).

  First, the reference packet Pr is transmitted from the transmitter 11n (step S31). The receiving unit 20 that has correctly received the reference packet Pr returns an ACK indicating that the reference packet Pr has been correctly received to the transmitting unit 10 (step S32). When the transmission unit 10 receives ACK, the transmission unit 10 determines that the reception unit 20 has correctly received the reference packet Pr and transmits the data packet Pd. However, the receiving unit 20 fails to normally receive the data packet Pd due to interference or noise (step S33).

  Even when the data packet Pd cannot be received in this way, the receiving unit 20 has correctly received the reference packet Pr and can confirm the frequency channel for communication. Do not do. That is, even if the data packet Pd cannot be received, it is not necessary to perform the frequency channel changing operation when the reference packet Pr is correctly received, and there is no communication delay associated with the frequency channel changing operation. The data information D1 included in the correctly received reference packet Pr is used for reference only.

<When a communication error occurs during reference packet transmission>
In the communication between the transmission unit 10 and the reception unit 20, the communication procedure when a communication error occurs in the transmission of the reference packet Pr is as follows (FIG. 4C).

  First, the reference packet Pr is transmitted from the transmitter 11n. However, the receiving unit 20 fails to receive the reference packet Pr normally due to interference or noise (step S41). At this time, the receiving unit 20 does not return ACK to the transmitting unit 10. However, the transmitting unit 10 transmits the data packet Pd even when no ACK is returned from the receiving unit 20 (after a predetermined waiting time has elapsed) (step S42).

  The receiving unit 20 that has correctly received the data packet Pd transmitted in step S42 returns an ACK indicating that the data packet Pd has been correctly received to the transmitting unit 10 (step S43).

  Even when the reference packet Pr cannot be received in this way, the receiving unit 20 has received the data packet Pd correctly and can confirm the frequency channel for communication. Do not do. That is, even if the reference packet Pr cannot be received, when the data packet Pd is correctly received, there is no need to perform the frequency channel changing operation, and there is no communication delay associated with the frequency channel changing operation.

  The data information D2 included in the correctly received data packet Pd is taken into the data processing unit 43 of the terminal 21 of the receiving unit 20 and is subjected to predetermined processing (between the transmitting unit 10 and the receiving unit 20). The communication data is transmitted correctly, and the desired operation / control is performed.)

<Processing procedure flow>
FIG. 5 is a flowchart for explaining the procedure of the processing operation in the terminal 21 included in the receiving unit 20 of the wireless communication device 1.

  The terminal 21 receives the data (communication data) transmitted by the transmission unit 10 at the second transmission / reception unit 41 (step S1).

  In step S2 following step S1, the terminal 21 determines whether or not the second transmitting / receiving unit 41 has correctly received the reference packet Pr (YES) (NO). If the determination result is YES, the terminal 21 proceeds to the next step S3, and if NO, performs the process of step S8 described later. In addition, when the receiving unit 20 correctly receives the reference packet Pr, the receiving unit 20 returns an ACK to the transmitting unit 10 (see step S22, FIG. 4A). The transmission unit 10 that has received the ACK transmits the data packet Pd (see step S23, see FIG. 4A).

  The terminal 21 that has proceeded to step S3 stores the data information D1 included in the reference packet Pr in the storage unit 44 included in the second control circuit unit 42.

  In step S4 following step S3, the terminal 21 determines whether the second transmitting / receiving unit 41 has correctly received the data packet Pd (YES) or not (NO). If the determination result is YES, the terminal 21 proceeds to the next step S5, and if NO, performs the process of step S9 described later. When receiving the data packet Pd correctly, the receiving unit 20 returns an ACK to the transmitting unit 10 (see step S24, FIG. 4A).

  In step S5, the terminal 21 compares the data information D1 included in the reference packet Pr with the data information D2 included in the data packet Pd by the determination unit 45 included in the second control circuit unit 42, and both data It is determined whether the information matches (YES) or not (NO). If the determination result is YES, the terminal 21 proceeds to the next step S6, and if NO, performs the process of step S10 described later.

  The terminal 21 that has proceeded to step S6 maintains the frequency channel for receiving data (the frequency channel changing operation is not performed).

  In step S7 following step S6, the terminal 21 takes in and processes the data information D2 by the data processing unit 43, and ends one cycle of the processing operation. Thus, the state in which processing is performed in order up to steps S1, S2, S3,..., Step S7 is a state in which normal communication (FIG. 4A) is performed.

  By the way, in the above-described step S2, since the second transmitter / receiver 41 cannot correctly receive the reference packet Pr, the terminal 21 that has proceeded to the processing of step S8 has received the data packet Pd correctly by the second transmitter / receiver 41. It is determined whether (YES) or not (NO). When this determination result is YES, the terminal 21 executes the above-described step S6 (maintenance of the received frequency channel) (after executing step S6, executes step S7). On the other hand, when the determination result is NO, The terminal 21 performs the process of step S12 described later.

  Even if the reference packet Pr is not correctly received in step S2 and ACK is not returned to the transmission unit 10, the transmission unit 10 transmits the data packet Pd (step S42, FIG. 4C). 21 can perform the process of step S8.

  By the way, in step S4 described above, since the second transmitting / receiving unit 41 cannot receive the data packet Pd (FIG. 4B), the terminal 21 that has proceeded to the processing of step S9 correctly transmits the reference packet Pr in step 2. Since it was received, the frequency channel to be received is not changed. When the process in step S9 is completed, one cycle of the processing operation is completed (when there is a communication error in the data packet Pd).

  In step S5 described above, since the data information D1 included in the reference packet Pr and the data information D2 included in the data packet Pd do not match, the terminal 21 that has proceeded to the processing in step S10 maintains the communication frequency channel. to continue. This is because the reception of the reference packet Pr (step S2) and the reception of the data packet Pd (step S4) were performed correctly.

  In step S11 following step S10, since the data information D1 and the data information D2 do not match, the terminal 21 discards the data information D2 (when the data information D1 and D2 do not match), and ends one cycle of the processing operation. .

  By the way, in the above-described step S8, when the second transmitting / receiving unit 41 cannot receive the data packet Pd, in addition to the second transmitting / receiving unit 41 having not correctly received the reference packet Pr, the data packet Pd Therefore, it is necessary to confirm the necessity of frequency channel change for avoiding a communication error, and the terminal 21 that has proceeded to the process of step S12 performs the process of confirming the change of the frequency channel. Return to S1.

  The wireless communication apparatus according to the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications without departing from the spirit thereof. For example, the present invention can be applied to a short-distance or long-distance wireless communication apparatus as well as a local wireless communication apparatus between various electronic devices in an office, home, and the like. The communication data transmitted by the wireless communication apparatus according to the present invention is not limited to the desired operation / control, and may be, for example, data of information that stimulates human senses such as voice and video, or a desired physical quantity. The measurement data may be.

  The wireless communication apparatus according to the present invention can be industrially manufactured and used, and is subject to commercial transactions. Therefore, the present invention has an economic value and can be used industrially. .

DESCRIPTION OF SYMBOLS 1 Wireless communication apparatus 10 Transmission part 20 Reception part 44 Storage part 43 Determination part D1 Data information (1st data information)
D2 data information (second data information)
Pd Data packet Pr Reference packet

Claims (2)

In a wireless communication apparatus having a transmission unit and a reception unit and transmitting communication data from the transmission unit to the reception unit,
When the transmission unit transmits communication data to the reception unit,
The transmitter transmits a reference packet including first data information, and then transmits a data packet including second data information.
The receiver is
In the case of correctly receiving the reference packet and storing the first data information of the correctly received reference packet,
When normal reception of the data packet fails
While maintaining the frequency channel to receive
Using the stored first data information only for comparison with the second data information;
In the case where normal reception of the reference packet fails,
When the data packet is correctly received
While maintaining the frequency channel to receive
Taking the second data information of the correctly received data packet and performing a predetermined process;
If the receiving unit receives both the reference packet and the data packet , does the first data information included in the reference packet match the second data information included in the data packet? Determine whether or not
When the first data information included in the reference packet matches the second data information included in the data packet, the received frequency channel is maintained and the second data information included in the data packet is maintained. Take in the data information and perform the prescribed processing
When the first data information included in the reference packet does not match the second data information included in the data packet, the second data information included in the data packet is discarded. A wireless communication device. The receiving unit stores the first data information included in the reference packet, and the first data information included in the reference packet matches the second data information included in the data packet. The wireless communication apparatus according to claim 1 , further comprising a determination unit that determines whether or not.

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