JPH10285161A - Radio communication method of radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a plurality of data packets in a short time from a master station to a plurality of slave stations and also to surely send all the data packets. SOLUTION: When a master station 11 sends data packets PK1 , PK2 ,...PKn-1 and PKn to each slave station 21 to 41, the master station continuously broadcasts data packets to each slave station. It sends question signals Q1 to Q3 to each slave station, receives responses A1 to A3 that notify receiving results from each station and recognizes which data packet is not correctly received. The master station continuously broadcasts the data packets that are not correctly received to each slave station again and also sends question signals and receives responses from each slave station. After that, it repeats this operation until each slave station receives all the data packets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication method for continuously broadcasting data packets from a master station to a plurality of slave stations in a wireless communication system such as a wireless POS system and a wireless LAN system.

[0002]

2. Description of the Related Art For example, a master station connected to a host computer having a large capacity file for managing product information is
In a wireless POS system that wirelessly transmits and receives to and from a plurality of slave stations individually connected to a plurality of POS terminal devices that perform registration processing of product sales data at a store in a store, it is very important to manage product information. In order to handle such data, loss of data transmitted from the master station to each slave station is not allowed. For example, when downloading data from the master station to each slave station, in order to ensure communication and to simplify the communication procedure, transmit data packets to each slave station in order. I was

[0003] Accordingly, the same applies to the case where data packets having the same contents are downloaded to a plurality of slave stations.
As shown at 0, when the master station downloads the packet data PK1 to PKn to the three slave stations A to C, the master station first transmits the data packet PK1 to the slave station A and sends the data packet PK1 to the slave station A. A receives the response RA of the reception result from A and confirms that the slave station A has correctly received the data packet PK1.
K1 is transmitted and a response RB of the reception result is received from the slave station B,
When it is confirmed that the slave station B has correctly received the data packet PK1, the same data packet PK1 is transmitted to the slave station C, and a response R
C, and confirms that the slave station C has correctly received the data packet PK1, and then performs communication control to transmit the next data packet PK2 to the slave station A, and if the data packet is correctly received. Whenever a slave station that cannot be received occurs, control is performed to retransmit a data packet to the slave station each time, thereby ensuring downloading of data.

Japanese Patent Laid-Open Publication No. Hei 6-86038 discloses a method in which a facsimile apparatus from a master station transmits a facsimile to a plurality of facsimile stations.
Data is broadcasted all at once, and each sub-station FAX
When the device receives the FAX data normally, it returns a PB signal to the master station FAX device. At this time, the PB signal from each slave station FAX device is returned so as not to overlap. In this case, the slave FAX device that normally receives the FAX data by recognizing the PB signal can be identified.

[0005]

However, in the former method of individually transmitting data packets to a plurality of slave stations, when the data amount or the number of data packets increases,
As the number of slave stations increases, there is a problem that the communication time increases. In the latter publication, there is no countermeasure for a slave FAX device that cannot normally receive FAX data even if the master FAX device can normally receive FAX data. Therefore, there is no wireless POS system. However, there is a problem that it cannot be applied as it is to a device that reliably transmits data to all slave stations.

Therefore, according to the first to third aspects of the present invention, there is provided a wireless communication system capable of transmitting all data packets from a master station to a plurality of slave stations in a short time and reliably. A wireless communication method for a communication system is provided.

[0007]

According to the first aspect of the present invention,
In a wireless communication system including a master station and a plurality of slave stations and performing transmission and reception between the master station and each slave station, first, the master station continuously transmits a plurality of data packets to each slave station. The data is transmitted all at once by sending a report, and after the transmission is completed, each slave station is individually inquired of the transmission result. The master station transmits the packet number that could not be received, and then the master station continuously and again broadcasts the data packet of the packet number that the slave station could not receive to each slave station. Inquires about the transmission result individually to the stations, and each slave station transmits the packet number that could be received or the packet number that could not be received again to the master station in response to this inquiry. Receive data packets Lies in repeating this until you.

According to a second aspect of the present invention, in a wireless communication system including a master station and a plurality of slave stations, and performing transmission and reception between the master station and each slave station, first, the master station is assigned to each slave station. On the other hand, data is transmitted all at once by continuously broadcasting multiple data packets, and after the transmission is completed, each slave station is individually inquired of the transmission result. The master station transmits the packet number that could be received or the packet number that could not be received to the master station.
The data packet of the packet number that each slave station could not receive is broadcast one by one to each slave station, and the transmission result is individually transmitted to the slave stations that could not receive the corresponding data packet for each transmission. Makes an inquiry, and the corresponding slave station transmits a reception result in response to the inquiry from the master station.
This is to repeat this until each slave station receives all data packets.

According to a third aspect of the present invention, there is provided a radio communication system comprising a master station and a plurality of slave stations, and performing transmission and reception between the master station and each slave station. On the other hand, data is transmitted all at once by continuously broadcasting multiple data packets, and after the transmission is completed, each slave station is individually inquired of the transmission result. The master station transmits the packet number that could be received or the packet number that could not be received to the master station.
Each slave station transmits the data packet of the packet number that could not be received individually to the corresponding slave station, and the corresponding slave station transmits the reception result to the master station. This is to repeat this until a data packet is received.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) In this embodiment, an embodiment corresponding to claim 1 will be described.

FIG. 1 is a block diagram showing the configuration of the system. Reference numeral 11 denotes a master station, and reference numerals 21, 31, and 41 denote slave stations. The master station 11 includes a transmitting unit 13 and a receiving unit 14 connected to an antenna 12 and a control unit 15 for controlling the transmitting unit 13 and the receiving unit 14. Each of the slave stations 21, 31, 41
Are transmitting units 23, 33, 43, receiving units 24, 34, 44 connected to antennas 22, 32, 42, respectively, and a control unit 25 for controlling the transmitting units 23, 33, 43, receiving units 24, 34, 44. , 35, 45.

The master station 11 is connected to the slave stations 21, 31,.
As shown in FIG. 2, when transmitting a plurality of data packets wirelessly to the mobile station 41, the control unit 15 controls the transmission unit 13 in S1 to continuously transmit the plurality of data packets from the antenna 12 to each slave station, as shown in FIG. It broadcasts to 21, 31, and 41.
Then, when the broadcast transmission is completed for all the data packets, the master station 11 determines in S2 each of the slave stations 21, 31, 4
1 to each other.

Each of the slave stations 21, 31, and 41 transmits a response to the inquiry signal from the master station 11. That is, a response including the information of the packet number that could be received or the packet number that could not be received is transmitted. Thereby, the master station 11 receives the response from the slave station in S3.

Then, when an inquiry signal is transmitted to all the slave stations 21, 32, and 42, and responses are received from all the slave stations, it is subsequently determined whether or not the data packet transmission is completed. That is, all the slave stations 21, 31, 4
1 determines whether all data packets have been received correctly. If all the slave stations 21, 31, 41 have correctly received all the data packets, it is determined that the transmission of the data packets has been completed, and the transmission control is terminated.

However, if all the slave stations 21, 31, 41 have not received all the data packets correctly, it is determined that the transmission of the data packets has not been completed.
The master station 11 returns to S1 and again broadcasts the unreceivable data packet to each of the slave stations 21, 31, 41. When the broadcast transmission is completed for all the data packets that could not be received, the master station 11 in S2.
Transmits an interrogation signal individually to each of the slave stations 21, 31, and 41, and receives a response from each of the slave stations in S3.

The above-mentioned broadcast transmission of data packets is repeated until each of the slave stations 21, 31, and 41 performs normal reception for all data packets, and each of the slave stations 21, 31, and 41 performs normal reception for all data packets. Then, it is determined that the data packet transmission has been completed, and the transmission control ends.

On the other hand, the slave stations 21, 31, 41 are:
As shown in FIG. 3, a data packet reception process is performed in S11, and the process waits for reception of an interrogation signal. In the data packet receiving process, the packet number of the received data packet is checked, and if there is a data packet that cannot be received normally due to an error or the like, the packet number is stored in the memory of the control unit.

When a series of data packet reception processing from the master station 11 is completed and an inquiry signal is received from the master station 11, the slave station stores in the memory in S12 the normally unreceivable data packet. Is transmitted to the master station 11 including the information of the packet number. The above control is repeated until all the data packets are normally received. When all the data packets are normally received, the reception completion of the data packet is determined and the child reception control is ended.

In such a configuration, the master station 11 transmits n data packets PK1, PK2 to each of the slave stations 21, 31, 41.
When transmitting PK2,..., PKn-1, PKn, FIG.
, The master station 11 sends data packets PK1, PK2,..., PKn-1 to each of the slave stations 21, 31, 41.
, PKn are continuously broadcast. Each slave station 21,3
In steps 1 and 41, each time a data packet is received, it is determined whether or not the data packet has been correctly received. If any data packet has not been correctly received, the packet number is stored in the memory.

The master station 11 transmits the data packets PK1, PK
When the broadcast transmission of 2,..., PKn-1 and PKn is completed, first, an interrogation signal Q1 is transmitted to the slave station 21. On the other hand, the slave station 21 transmits a response A1 to the master station 11.
At this time, if there is a data packet that could not be correctly received in the packet reception, the packet number is stored in the memory, and the information of this packet number is included in the response A1.

Subsequently, the master station 11 sends the interrogation signal Q to the slave station 31.
Send 2. In response, the slave station 31 sends a response A2 to the master station 11. At this time, if the packet number of the data packet that has not been correctly received is stored in the memory, the information of this packet number is included in the response A2.

Subsequently, the master station 11 sends an inquiry signal Q to the slave station 41.
Send 3. On the other hand, the slave station 41 transmits a response A3 to the master station 11. At this time, if the packet number of the data packet that could not be received correctly is stored in the memory, the information of this packet number is included in the response A3.

Thus, in the master station 11, each of the slave stations 21, 3
Since it is possible to recognize which data packet was not correctly received by the first broadcast transmission based on the packet numbers from the first and the first broadcasts, the data packets that were not correctly received are continuously transmitted to the slave stations 21, 31, and 41 again. Information. At this time, depending on the slave station, the already received data packet may be received again.In this case, the received data packet is discarded again, or a previously received data packet is discarded and a new data packet is obtained. Or perform one of the processes. At this time, each of the slave stations 21, 31, and 41 also determines whether or not the data packet which could not be correctly received last time has been correctly received. If the data packet could not be correctly received, the packet number is stored in the memory. I do.

When the broadcast transmission of the data packet which has not been correctly received last time is completed, the master station 11 first transmits an interrogation signal Q1 to the slave station 21, and receives a response A1 from the slave station 21. Subsequently, an inquiry signal Q2 is transmitted to the slave station 31, and a response A2 is received from the slave station 31. Subsequently, an inquiry signal Q3 is transmitted to the slave station 41, and a response A3 is received from the slave station 41.

If the responses A 1, A 2, and A 3 include the packet number again, the master station 11 again transmits the data packet corresponding to the packet number to each of the slave stations 21.
Broadcasting will be made to 31 and 41. In this way, each of the slave stations 21, 31, 41 receives all the data packets PK1,
Broadcasting is repeated until PK2,..., PKn-1, PKn can be correctly received, and when each of the slave stations 21, 31, 41 can correctly receive all data packets, the transmission control ends.

As described above, the master station 11 is connected to each of the slave stations 21, 31,.
Since the same data packet is not transmitted individually to 41, but is simultaneously transmitted to each of the slave stations 21, 31, and 41 by broadcast transmission, data can be transmitted in a short time. Moreover, each of the slave stations 21, 31, 41 receives all data packets PK1, PK2,..., PKn-1, Pn-1.
Since broadcast transmission is repeated for data packets that cannot be received until Kn can be correctly received, all data packets can be reliably transmitted from the master station 11 to the slave stations 21, 31, and 41.

In this embodiment, the master station 1
After transmitting a plurality of data packets from 1 to each of the slave stations 21, 31, and 41, the master station 11 individually sends interrogation signals Q1, Q2, and Q3 to each of the slave stations 21, 31, and 41, and A response including a packet number is received from the station, but the present invention is not limited to this. A different time slot is provided for each slave station, and a plurality of data is transmitted from the master station 11 to each slave station 21, 31, 41. After transmitting the packet, each slave station may transmit a response including the packet number to the master station at a different timing based on the time slot.

(Second Embodiment) In this embodiment, an embodiment corresponding to claim 2 will be described. The hardware configuration in this embodiment is the same as that in FIG.
The master station 11 first sends a plurality of data packets PK1, PK2,..., PKn-1, PK to each of the slave stations 21, 31, 41.
n are broadcasted continuously, and when the broadcast transmission is completed, the interrogation signals Q1, Q2, Q3 are sequentially sent to the slave stations 21, 31, 41.
Are transmitted from the slave stations 21, 31, and 41 to the responses A1, A2, and A3 including the information on the packet numbers of the data packets that could not be correctly received, as in the first embodiment. is there.

That is, as shown in FIG.
At 1, the master station 11 sends a message to each of the slave stations 21, 31, 41,
A plurality of data packets are continuously broadcast. Then, when the broadcast transmission is completed for all the data packets, the master station 11 makes the slave stations 21, 31, 41 at S22.
, Individually transmit question signals Q1, Q2, Q3.
On the other hand, each of the slave stations 21, 31, 41 sends responses A 1, A 2, A 3 to the master station 11. If there is a data packet that could not be received at this time, a response including the information of the packet number is transmitted. Thereby, S2
At 3, the master station 11 receives a response from the slave station.

Then, an inquiry signal is transmitted to all the slave stations 21, 32, and 42, and responses are received from all the slave stations. Then, it is determined whether data packet transmission is completed. That is, all the slave stations 21, 31, 4
1 determines whether all data packets have been received correctly. If all the slave stations 21, 31, 41 have correctly received all the data packets, it is determined that the transmission of the data packets has been completed, and the transmission control is terminated.

The above control is the same control as in the first embodiment. Next, control specific to this embodiment will be described. The master station 11 has all the slave stations 21, 31, 41
If does not receive all data packets correctly, determines that the data packet transmission has not been completed,
One of the data packets not received correctly in S24
One is broadcast to each of the slave stations 21, 31, and 41. Then, in step S25, an interrogation signal is individually transmitted to the slave station that failed to receive the data packet correctly.
Receives a response from the corresponding slave station.

The above control is sequentially performed on all data packets that have not been correctly received, and when this is completed, it is determined whether the data packet transmission has been completed. That is, it is determined whether all data packets that have not been correctly received have been correctly received. Then, if there is still a data packet that has not been correctly received, the same transmission control is repeated for the remaining data packet. When all the slave stations 21, 31, and 41 finally determine that all the data packets have been correctly received, the master station 11 determines that the transmission of the data packet has been completed, and ends the transmission control.

In such a configuration, the master station 11 sends n data packets PK1, PK1 to each of the slave stations 21, 31, 41.
PK2,..., PKn-1 and PKn are transmitted. At this time, if the slave station 21 cannot correctly receive the data packets PK2 and PKx and the slave stations 31 and 41 cannot correctly receive the data packet PKi, FIG. As shown in
The master station 11 first broadcasts a data packet PK2 to each of the slave stations 21, 31, 41. Subsequently, the slave station 21
Transmits an interrogation signal Q11. In contrast, slave station 2
1 transmits to the master station 11 a response A11 indicating whether or not the data packet PK2 has been correctly received. on the other hand,
Since the slave stations 31 and 41 have already correctly received the data packet PK2, the slave stations 31 and 41 receive the data packet PK2 again.
, Or a new data packet PK2 is fetched after discarding the previously received data packet PK2.

Next, the master station 11 is connected to each of the slave stations 21, 31, 41.
Broadcasts a data packet PKi. Subsequently, an interrogation signal Q21 is transmitted to the slave station 31. On the other hand, the slave station 31 transmits to the master station 11 a response A21 indicating whether or not the data packet PKi has been correctly received. Further, an inquiry signal Q31 is transmitted to the slave station 41. On the other hand, the slave station 41 transmits to the master station 11 a response A31 indicating whether or not the data packet PKi has been correctly received. On the other hand, since the slave station 21 has already received the data packet PKi correctly, the slave station 21 discards the received data packet PKi again, or discards the previously received data packet PKi and then starts a new data packet PKi.
Import i or do one of the following.

Next, the master station 11 is connected to each of the slave stations 21, 31, 41.
Broadcasts a data packet PKx. Subsequently, an inquiry signal Q12 is transmitted to the slave station 21. On the other hand, the slave station 21 transmits to the master station 11 a response A12 indicating whether or not the data packet PKx has been correctly received. On the other hand, the slave stations 31 and 41 have already
Since Kx has been received correctly, either processing is performed to discard the data packet PKx received again or to take in a new data packet PKx after discarding the previously received data packet PKx.

If the response from the slave station includes information of a packet number indicating that there is a data packet that could not be correctly received, the master station 11 performs the broadcast transmission again for the data packet. Then, an inquiry signal is transmitted to the corresponding slave station to receive a response. In this way, the master station 11 determines that each of the slave stations 21, 31, 41 has all the data packets PK1, PK2,..., PKn-1.
, PKn are correctly received.

Also in this embodiment, the master station 11 does not individually transmit the same data packet to each of the slave stations 21, 31, and 41, but broadcasts each of the slave stations 2.
Since data is simultaneously transmitted to 1, 31, and 41, data can be transmitted in a short time. Moreover, each slave station 21,
31 and 41 are all data packets PK1, PK2,
.., PKn-1 and PKn are repeatedly broadcasted for data packets that could not be received until they can be correctly received, so that a plurality of data packets are transmitted from the master station 11 to the slave stations 21, 31, and 41 without fail. can do.

(Third Embodiment) In this embodiment, an embodiment corresponding to claim 3 will be described. The hardware configuration in this embodiment is the same as that in FIG.
The master station 11 first sends a plurality of data packets PK1, PK2,..., PKn-1, PK to each of the slave stations 21, 31, 41.
n are broadcasted continuously, and when the broadcast transmission is completed, the interrogation signals Q1, Q2, Q3 are sequentially sent to the slave stations 21, 31, 41.
Are transmitted from the slave stations 21, 31, and 41 to the responses A1, A2, and A3 including the information on the packet numbers of the data packets that could not be correctly received, as in the first embodiment. is there.

That is, as shown in FIG.
At 1, the master station 11 sends a message to each of the slave stations 21, 31, 41,
A plurality of data packets are continuously broadcast. Then, when the broadcast transmission is completed for all the data packets, in S32, the master station 11 makes the slave stations 21, 31, 41
, Individually transmit question signals Q1, Q2, Q3.
On the other hand, each of the slave stations 21, 31, 41 sends responses A 1, A 2, A 3 to the master station 11. If there is a data packet that could not be received at this time, a response including the information of the packet number is transmitted. Thereby, S3
At 3, the master station 11 receives a response from the slave station.

Then, an inquiry signal is transmitted to all the slave stations 21, 32 and 42, and when responses are received from all the slave stations, it is subsequently determined whether or not the data packet transmission has been completed. That is, all the slave stations 21, 31, 4
1 determines whether all data packets have been received correctly. If all the slave stations 21, 31, 41 have correctly received all the data packets, it is determined that the transmission of the data packets has been completed, and the transmission control is terminated.

The above control is the same control as in the first embodiment. Next, control specific to this embodiment will be described. The master station 11 has all the slave stations 21, 31, 41
If does not receive all data packets correctly, determines that the data packet transmission has not been completed,
In S34, the data packets not correctly received are individually transmitted to the corresponding slave stations. Then, in S35, a response is received from the slave station that transmitted this data packet.

The above control is sequentially performed on all data packets that have not been correctly received, and when this is completed, it is determined whether data packet transmission has been completed. That is, it is determined whether all data packets that have not been correctly received have been correctly received. Then, if there is still a data packet that has not been correctly received, the same transmission control is repeated for the remaining data packet. When all the slave stations 21, 31, and 41 finally determine that all the data packets have been correctly received, the master station 11 determines that the transmission of the data packet has been completed, and ends the transmission control.

As shown in FIG. 8, each of the slave stations 21, 31, and 41 first receives data packets broadcast from the master station 11 in step S41. It waits for reception of the interrogation signal from the station 11, and upon receiving the interrogation signal, transmits a response indicating the reception result in S42. Then, if all data packets from the master station 11 can be correctly received, the reception control of this data packet is terminated.

However, if there is a data packet that could not be received correctly, it is determined that the data packet has not been received, and the process waits for individual reception of the data packet that could not be received correctly from the master station 11. And the parent station 11
If there is a transmission of a data packet that could not be received correctly from the server, individual data packets are received in S43, and
At 44, a response notifying the reception result is transmitted to the master station 11. If all the data packets that have not been correctly received can be individually received correctly, it is determined that the reception of the data packet has been completed, and the reception control of the data packet is terminated.

In such a configuration, the master station 11 transmits n data packets PK 1, PK 1 to each of the slave stations 21, 31, 41.
PK2,..., PKn-1 and PKn are transmitted. At this time, the slave station 21 cannot correctly receive the packet data PK2, PKi and PKx, and the slave station 31 transmits the data packet PK2.
, PKk cannot be correctly received, and the slave station 41 can correctly receive all data packets.
As shown in (1), the master station 11 first individually transmits a data packet PK2 to the slave station 21. The slave station 21 receives this and sends a response A11 to the master station 11 to inform whether or not the data packet PK2 has been correctly received.

Next, the master station 11 individually transmits the data packet PK2 to the slave station 31. The slave station 31 receives this and transmits a response A21 to the master station 11 to inform whether or not the data packet PK2 has been correctly received. Next, the master station 11 sends the data packet PK to the slave station 21.
Send i individually. The slave station 21 receives this and sends a response A12 to the master station 11 to inform whether or not the data packet PKi has been correctly received.

Next, the master station 11 individually transmits the data packet PKk to the slave station 31. The slave station 31 receives this and sends a response A22 to the master station 11 to inform whether or not the data packet PKk has been correctly received. Next, the master station 11 sends the data packet PK to the slave station 21.
Send x individually. The slave station 21 receives this and transmits a response A13 to the master station 11 to inform whether or not the data packet PKx has been correctly received.

If the response from the slave station includes information of a packet number indicating that there is a data packet that could not be correctly received, the master station 11 again transmits the data packet individually. The master station 11 repeats this transmission control until each of the slave stations 21, 31, 41 can correctly receive all the data packets PK1, PK2,..., PKn-1, PKn.

In this embodiment, the master station 11 does not individually transmit the same data packet to each of the slave stations 21, 31, and 41 at first, but broadcasts each of the slave stations 21, 31, and 41. Since the data is simultaneously transmitted to 41, the data can be transmitted in a short time. Moreover, each slave station 2
1, 31, 41 are all data packets PK1, PK
,..., PKn-1 and PKn cannot be correctly received. Since the individual transmission is repeated for the data packets that could not be received until the data packets could be received, a plurality of data All packets can be transmitted reliably.

In each of the above-described embodiments, the wireless communication system has three slave stations with respect to the master station. However, the present invention is not limited to this. May be. Also, in each of the above-described embodiments, when there is a data packet that the slave station could not receive correctly in the first broadcast transmission from the master station, transmission control for retransmitting the data packet that could not be received correctly is performed. Are different from each other, but the present invention is not necessarily limited to this, and these transmission controls may be mixed.

[0051]

As described above, according to the first to third aspects of the present invention, data consisting of a plurality of data packets is transmitted from a master station to a plurality of slave stations in a short time and all data packets are reliably transmitted. can do.

[Brief description of the drawings]

FIG. 1 is a block diagram of a system configuration showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing data packet transmission control of a master station in the embodiment.

FIG. 3 is a flowchart showing data packet reception control of a slave station in the embodiment.

FIG. 4 is a diagram showing transmission and reception timings of a data packet, an interrogation signal, and a response between a master station and a slave station in the embodiment.

FIG. 5 is a diagram showing transmission / reception timings of a data packet, a query signal, and a response between a master station and a slave station with respect to a data packet that cannot be correctly received in the second embodiment of the present invention.

FIG. 6 is a flowchart showing data packet transmission control of a master station in the embodiment.

FIG. 7 is a flowchart showing data packet transmission control of a master station according to the third embodiment of the present invention.

FIG. 8 is a flowchart showing data packet reception control of a slave station in the embodiment.

FIG. 9 is a diagram showing transmission / reception timing of a data packet and a response between a master station and a slave station for a data packet that cannot be correctly received in the embodiment.

FIG. 10 is a diagram illustrating a conventional data packet and response transmission / reception timing between a master station and a slave station.

[Explanation of symbols]

 11 master station 15 master station control section 21, 31, 41 slave station 25, 35, 45 slave station control section

Claims (3)

[Claims] 1. In a wireless communication system comprising a master station and a plurality of slave stations and performing transmission and reception between the master station and each slave station, first, the master station has a plurality of slave stations with respect to each slave station. Data packets are transmitted simultaneously by continuously transmitting data packets, and after completion of transmission, each of the slave stations is individually inquired of a transmission result. The received packet number or the packet number that could not be received is transmitted to the master station, and then the master station sends the data packet of the packet number that each slave station could not receive to the slave station again. Broadcast transmission is continuously performed, and after the transmission is completed, each slave station is individually inquired of a transmission result, and each slave station responds to this inquiry again with the packet number or reception number received by the master station. Packet that could not be And sending the number, or later, a wireless communication method of a wireless communication system, characterized by repeating this until each slave station receives all data packets. 2. In a wireless communication system comprising a master station and a plurality of slave stations and performing transmission and reception between the master station and each slave station, first, the master station has a plurality of slave stations with respect to each slave station. Data packets are transmitted simultaneously by continuously transmitting data packets, and after completion of transmission, each of the slave stations is individually inquired of a transmission result. The master station transmits the packet number that could be received or the packet number that could not be received, and then the master station sends the data packets of the packet numbers that the respective slave stations could not receive to the respective slave stations one by one. Broadcast to
For each transmission, an inquiry about the transmission result is individually made to the slave station that could not receive the corresponding data packet, and the applicable slave station transmits the reception result in response to the inquiry from the master station. A wireless communication method for a wireless communication system, comprising repeating the above until a slave station receives all data packets. 3. A wireless communication system comprising a master station and a plurality of slave stations and performing transmission / reception between the master station and each slave station, wherein the master station is provided with a plurality of slave stations with respect to each slave station. Data packets are transmitted simultaneously by continuously transmitting data packets, and after completion of transmission, each of the slave stations is individually inquired of a transmission result. The received packet number or the packet number that could not be received is transmitted to the master station, and then the master station individually separates the data packet of the packet number that each slave station could not receive into the corresponding slave station. The corresponding slave station transmits a reception result to the master station, and thereafter repeats this until each slave station receives all data packets. Communication method.