WO2015064288A1 - Wireless communication device, wireless communication system, and wireless communication method thereof - Google Patents

Abstract

The present invention avoids a decrease in performance accompanying a communication error recovery process. In this wireless communication system, a packet generation unit of a transmission device generates a plurality of packets by splitting data and imparting to each unit of split data a sequence number indicating the transmission sequence. A transmission unit of the transmission device continuously transmits the plurality of packets to a reception device in accordance with the transmission sequence without confirming the reception at the reception device. A retransmission processing unit of the transmission device retransmits packets designated by a retransmission request from the reception device among the transmitted plurality of packets.

Description

Wireless communication apparatus, wireless communication system, and wireless communication method therefor

The present invention relates to a wireless communication system including a plurality of wireless communication devices, and more particularly, to a wireless communication device that recovers a communication error, a wireless communication system, a processing method therefor, and a program that causes a computer to execute the method.

Conventionally, in wireless communication, packet retransmission control is performed as a method for recovering an error that occurred during communication. In this case, a data packet is transmitted from the transmitting device, while the receiving device constantly monitors whether there is a packet (missing packet) that has failed to be received. The transmitting device transmits a next data packet after confirming that the receiving device has received the data normally. For example, a data communication apparatus has been proposed that transmits a predetermined number of frames between transmission and reception and then enters a reception mode and waits for a response from the reception side (see, for example, Patent Document 1).

JP-A-6-147595

In the above-described prior art, since the transmission side enters the reception mode after transmitting a certain number of frames, the frames can be received in sequence even if the reception side has a small number of buffers. However, in this prior art, since reception confirmation is performed each time transmission is performed, there arises a problem that the throughput of wireless communication is reduced.

This invention is made in view of such a situation, and it aims at avoiding the performance fall accompanying the recovery process of a communication error.

The present invention has been made to solve the above-described problems, and a first aspect of the present invention is a wireless communication system that transmits and receives data between a first wireless communication device and a second wireless communication device. The first wireless communication apparatus divides data and adds a sequence number indicating a transmission order to each of the divided data, and generates a plurality of packets. A transmission unit that continuously transmits the plurality of packets to the second wireless communication device in accordance with the transmission order without confirming reception in the wireless communication device, and a transmission that stores the plurality of transmitted packets A buffer, and a retransmission processing unit that retransmits a packet designated by a retransmission request from the second wireless communication device among the plurality of transmitted packets, the second wireless communication device Is based on a receiving unit that receives the plurality of packets transmitted from the first wireless communication device, a reception buffer that stores the plurality of received packets, and a sequence number of the plurality of received packets. A wireless communication system including a retransmission request unit that specifies a packet that has failed to be received and makes a retransmission request for only the packet that has failed to be received to the first wireless communication apparatus, and a wireless communication method thereof. As a result, a plurality of packets are transmitted from the first wireless communication device without confirming reception in the second wireless communication device, while packets are retransmitted according to a retransmission request from the second wireless communication device. Bring about an effect.

According to a second aspect of the present invention, there is provided a packet generator that divides data and adds a sequence number indicating a transmission order to each of the divided data to generate a plurality of packets, and wireless communication on a receiving side A transmission unit that continuously transmits the plurality of packets to the reception-side wireless communication device in accordance with the transmission order without confirming reception in the device; a transmission buffer that stores the plurality of transmitted packets; A wireless communication apparatus including a retransmission processing unit configured to retransmit a packet designated by a retransmission request from the reception-side wireless communication apparatus among the plurality of transmitted packets, and a wireless communication method thereof. Thus, there is an effect that a plurality of packets are transmitted without confirming reception in the reception-side wireless communication device, while packets are retransmitted in accordance with a retransmission request from the reception-side wireless communication device.

According to the present invention, it is possible to achieve an excellent effect that performance degradation associated with communication error recovery processing can be avoided.

It is a figure which shows the example of whole structure of the radio | wireless communications system in embodiment of this invention. It is a figure which shows the structural example of the radio | wireless communication apparatus 101 or 102 in embodiment of this invention. It is a figure which shows the structural example of the transmission function of the radio | wireless communication apparatus 101 in embodiment of this invention. It is a figure which shows the structural example of the receiving function of the radio | wireless communication apparatus 102 in embodiment of this invention. It is a figure which shows the field structure of the packet format in Bluetooth (trademark) specification. It is a figure which shows the example of a field structure of the data transmission packet in embodiment of this invention. It is a figure which shows the example of a field structure of the resending request packet in embodiment of this invention. It is a flowchart which shows the example of a process sequence of the data transmission process in embodiment of this invention. It is a sequence diagram which shows the example of a process sequence of the data transmission process in embodiment of this invention. It is a timing chart in case the resending at the time of the data transmission in embodiment of this invention does not arise. It is a timing chart when resending at the time of the data transmission in embodiment of this invention arises. It is a flowchart which shows the process sequence example of the termination | terminus process in embodiment of this invention. It is a sequence diagram which shows the example of a process sequence of the termination | terminus process in embodiment of this invention.

Hereinafter, modes for carrying out the present invention will be described.

FIG. 1 is a diagram illustrating an example of the overall configuration of a wireless communication system according to an embodiment of the present invention. This wireless communication system is composed of a plurality of wireless communication devices. Here, two wireless communication apparatuses 101 and 102 are shown. The wireless communication devices 101 and 102 have the same configuration, and one of the wireless communication devices 101 and 102 operates as a transmission device and the other as a reception device depending on the situation. Hereinafter, a case where the wireless communication apparatus 101 operates as a transmission apparatus and the wireless communication apparatus 102 operates as a reception apparatus will be described.

FIG. 2 is a diagram illustrating a configuration example of the wireless communication apparatus 101 or 102 according to the embodiment of the present invention. The wireless communication apparatus 101 or 102 includes a processor 110, a memory 120, a communication control unit 130, a transmission / reception buffer 140, a reception unit 150, a transmission unit 160, an antenna switch 170, and an antenna 180. .

The processor 110 is a processing device that manages and controls the overall operation of the wireless communication device, such as applications and communications. The memory 120 is a large-capacity memory that stores programs executed by the processor 110 and data for communication. The communication control unit 130 performs processing related to wireless communication, and performs processing such as transmission / reception mode switching control and frequency hopping. The transmission / reception buffer 140 is a buffer that temporarily stores transmitted or received data packets and control packets. The receiving unit 150 performs packet reception processing. The transmission unit 160 performs packet transmission processing. The antenna 180 is an antenna for wireless communication. The antenna switch 170 is a switch for switching whether the antenna 180 is used for transmission or reception.

In addition, although embodiment as a radio | wireless communication apparatus is described here, this invention is not limited to this, You may implement | achieve as a communication part of another processing apparatus. For example, it may be connected to another processing apparatus via an interface, and data may be transmitted in accordance with a command from another processing apparatus, or received data may be input to another processing apparatus.

FIG. 3 is a diagram illustrating a configuration example of the transmission function of the wireless communication apparatus 101 according to the embodiment of the present invention. In this wireless communication apparatus 101, the reception unit 150, the transmission unit 160, the antenna switch 170, and the antenna 180 are the same as those already described. The transmission buffer 141 is a part of the transmission / reception buffer 140. Further, the packet generation unit 111 and the retransmission processing unit 112 can be realized as functions of the processor 110.

The packet generator 111 generates a plurality of packets by dividing data to be transmitted. That is, the packet generation unit 111 performs division into divided data to be loaded on the payload of each packet by the operation of a higher-level application that instructs data transmission.

Further, the packet generation unit 111 adds a sequence number indicating the transmission order to each of the plurality of packets. More specifically, data is divided into packets by software operation in the application layer, and data used for retransmission control such as “sequence number” and “CRC” is added to each divided data. On the other hand, the transmission unit 160 transmits the generated data to the reception device side via a normal link layer (for example, Bluetooth (registered trademark) standard or BLE (Bluetooth (registered trademark) Low Energy) standard) link layer or physical layer. Send to. At this time, packetization of data, transmission of packets, and the like are performed by lower layers corresponding to the respective communication standards.

Here, since each of the above-described operations is realized at the application level, it does not depend on the communication mode in the lower layer, and for example, there are various types even if the sequence number cannot be added to the packet. It can be used with various communication standards. However, a series of operations such as sequence number addition and retransmission control are not limited to processing in the application layer, and may be performed in another physical layer or link layer.

The transmission buffer 141 is a buffer that stores a plurality of packets transmitted by the transmission unit 160. This transmission buffer 141 manages each packet according to the sequence number added to the packet. A specific packet is read in accordance with an instruction from the retransmission processing unit 112, and the packet is transmitted again by the transmission unit 160.

The retransmission processing unit 112 performs processing for retransmitting a packet designated by a retransmission request from a receiving device among a plurality of transmitted packets. As will be described later, the receiving device specifies a packet (missing packet) that has failed to be received from the transmitting device, and requests retransmission of the missing packet. When the retransmission processing unit 112 receives a retransmission request for a lost packet, the retransmission processing unit 112 reads the designated packet from the transmission buffer 141 and transmits the packet again through the transmission unit 160.

FIG. 4 is a diagram illustrating a configuration example of the reception function of the wireless communication apparatus 102 according to the embodiment of the present invention. In this wireless communication apparatus 102, the receiving unit 150, the transmitting unit 160, the antenna switch 170, and the antenna 180 are the same as those already described. The reception buffer 142 is a part of the transmission / reception buffer 140. Further, the retransmission request unit 113 and the restoration unit 114 can be realized as functions of the processor 110.

The retransmission request unit 113 makes a retransmission request for a lost packet to the transmission apparatus. The retransmission request unit 113 identifies a missing packet based on sequence numbers added to a plurality of packets received from the transmission device.

The reception buffer 142 is a buffer for storing a plurality of packets received from the transmission device. The reception buffer 142 manages each packet according to the sequence number added to the packet.

The restoration unit 114 restores the original data included in the packet according to the sequence number added to the packet stored in the reception buffer 142. Note that the restored data is used in a subsequent processing apparatus (not shown).

FIG. 5 is a diagram showing a field configuration of a packet format in the Bluetooth (registered trademark) standard. This packet format includes a 72-bit access code, a 54-bit packet header, and a maximum 2745-bit payload.

The access code is a signal for performing synchronization and DC offset correction. This access code includes a preamble and a synchronization word.

The packet header is a packet header and includes a signal for controlling the packet. This packet header includes a 3-bit active member address (AM_ADDR), a 4-bit packet type (TYPE), a 1-bit flow control (FLOW), a 1-bit receipt indication (ARQN), and a 1-bit sequence number (SEQN). , An 18-bit bit string consisting of an 8-bit header error check (HEC) is encoded.

The active member address is an address for identifying the slave forming the piconet. The packet type indicates which of 16 different packet types. The packet type is roughly classified into ACL (Asynchronous Connection Less) used for general data transfer and SCO (Synchronous Connection Oriented) specialized for voice transfer. The flow control is for performing flow control in the ACL link. The reception display is for informing the transmission device of successful reception. The sequence number is for indicating sequence continuity in the data link layer. The header error check is for checking that the header is complete.

In the packet format in this Bluetooth (registered trademark) standard, the sequence number is 1 bit, and it is not possible to specify a specific packet and retransmit it by itself. Therefore, in the embodiment of the present invention, a specific packet is designated and retransmitted by newly adding a sequence number of multiple bits to the payload as follows.

FIG. 6 is a diagram showing a field configuration example of the data transmission packet in the embodiment of the present invention. This data transmission packet includes an 8-bit sequence number (SEQ-NO), variable-size data (INPUT-DATA), and a 16-bit CRC in the payload.

The sequence number indicates the packet transmission order. This sequence number is added by the packet generation unit 111. In this example, since 8 bits are assumed as the sequence number, 256 packets can be distinguished from each other.

The data is obtained by dividing the data to be transmitted by the packet generation unit 111. The divided data is restored by being merged by the restoration unit 114 of the receiving apparatus. In addition, a plurality of input data may be combined into individual packets within a range that fits within the maximum capacity of the packet, thereby improving transmission efficiency. In this case, the data may be transmitted at any time as soon as an input of some data is received without necessarily waiting for the data to be input to the full capacity.

CRC is a cyclic redundancy check code for detecting and correcting errors in the payload.

FIG. 7 is a diagram showing a field configuration example of a retransmission request packet in the embodiment of the present invention. This retransmission request packet includes an 8-bit sequence number (SEQ-NO) in the payload. One retransmission request packet may be used for one packet retransmission request as shown in a in the figure, and each sequence number is changed to one retransmission request packet when a plurality of packets are requested for retransmission as shown in b in the figure. It may be summarized.

Here, it is assumed that the wireless communication apparatuses 101 and 102 are connected by wireless communication according to the BLE standard. In this case, it is considered that the above-described data transmission packet and retransmission request packet are transmitted / received by exchanging data of “Service” and “Characteristic” of GLE (Generic Attribute Profile) of BLE. At this time, the data transmission packet can use “Notification”, which means data transmission that does not require a response, as a method for writing to the characteristic. On the other hand, for the retransmission request packet, “Write Value” can be used to write the number of the packet requesting retransmission in the retransmission packet list on the transmitting apparatus side.

Next, the operation of the wireless communication system in the above embodiment will be described with reference to the drawings.

FIG. 8 is a flowchart showing an example of a processing procedure of data transmission processing in the embodiment of the present invention. The processing procedure on the transmission device side is shown on the left side, and the processing procedure on the reception device side is shown on the right side.

The transmission device (wireless communication device 101) divides data to generate a packet, and transmits the packet (step S911). At this time, a sequence number is assigned as described above. The transmitted packet is not erased immediately, but is stored in the transmission / reception buffer 140 (transmission buffer 141) until the transmission of a series of data is completed or until the transmission / reception buffer 140 is full, to prepare for a retransmission request. . However, if there is a next transmission packet, packet transmission is continued without waiting for a retransmission request packet from the receiving apparatus. That is, packet transmission and retransmission of a requested packet may be performed in parallel.

When the reception device (wireless communication device 102) receives the packet transmitted from the transmission device (step S921: Yes), the sequence number (SEQ-NO) added to the packet is confirmed (step S922). Thereby, the presence or absence of a missing packet is determined. That is, if the sequence numbers of the received packets are separated, the packet between them is recognized as a missing packet. In other words, the presence of a missing packet is not recognized until the next packet is received.

If there is a missing sequence number (step S923: Yes) and it is detected that there is a missing packet, the receiving apparatus transmits a retransmission request packet including the sequence number of the missing packet to the transmitting apparatus (step S924).

When the transmission apparatus receives the retransmission request packet (step S912: Yes), if the designated packet exists in the transmission / reception buffer 140 (step S913: Yes), the transmission apparatus acquires the designated packet from the buffer memory, and newly The packet is transmitted to the receiving apparatus and retransmitted to the receiving apparatus (step S914). On the other hand, when the packet requested for retransmission has been discarded from the buffer memory of the transmission device (step S913: No), the transmission device notifies, for example, an error with respect to the transmission request in order to reject the retransmission request (step S915). ). After these processes, the transmission apparatus further performs the next packet transmission operation.

The receiving device receives the packet after the missing packet and performs the restoration process of the original data after receiving the retransmitted missing packet. At this time, the receiving apparatus does not discard the received packets after the missing packet. The transmitting apparatus also does not retransmit all the packets after the packet for which a retransmission request has been made. After these processes, the receiving apparatus further performs a receiving operation for the next packet.

In this way, the transmission device continuously transmits a plurality of packets to the reception device according to the transmission order without confirming reception at the reception device. Retransmit to receiver.

FIG. 9 is a sequence diagram illustrating an example of a processing procedure of data transmission processing according to the embodiment of the present invention. In this example, it is assumed that three packets are transmitted in one connection interval.

First, the first three packets transmitted from the transmitting device are normally received by the receiving device. For the next three packets, packet # 6 is received next to packet # 4. That is, since packet # 5 is not received and packet # 6 is received, it is detected that packet # 5 is a missing packet (821). Therefore, a retransmission request for packet # 5 is made from the receiving apparatus to the transmitting apparatus.

The transmission device continues transmission without confirming reception. When a retransmission request for packet # 5 is received, packet # 5 is read from transmission / reception buffer 140 (transmission buffer 141) and retransmitted to the reception device (812).

When packet # 5 is received by the receiving device, it is stored in transmission / reception buffer 140 (reception buffer 142). Thereafter, when all the packets necessary for data restoration are received, the original data is restored in the receiving device (823). The restored data is output to a subsequent processing device (not shown) (824).

FIG. 10 is a timing chart in the case where retransmission at the time of data transmission does not occur in the embodiment of the present invention. In the figure and the next figure, TX represents the transmission unit 160, and RX represents the reception unit 150.

As shown in the figure, the packet transmitted from the transmitting device is received by the receiving device, and retransmission is not requested when a missing packet is not detected.

FIG. 11 is a timing chart when retransmission occurs at the time of data transmission in the embodiment of the present invention.

As shown in the figure, when the packet # 6 is received without the packet # 5 transmitted from the transmitting device being received by the receiving device, the receiving device requests retransmission of the packet # 5. The transmitting apparatus interrupts and retransmits packet # 5 while continuously transmitting packet # 7 and subsequent packets.

FIG. 12 is a flowchart showing an example of a processing procedure of termination processing in the embodiment of the present invention. The processing procedure on the transmission device side is shown on the left side, and the processing procedure on the reception device side is shown on the right side.

In the retransmission process described above, the receiving device recognizes the presence of a missing packet when there is a missing sequence number in the received packet. On the other hand, when the last packet at the time of transmitting a series of data does not reach the receiving device, the receiving device cannot recognize the presence of the missing packet and cannot make a retransmission request. Therefore, after transmitting the last packet of a series of data, a “termination process” is performed between the transmitting device and the receiving device in order to confirm whether the last packet has been properly received.

The transmission device continuously transmits a plurality of packets to the reception device according to the transmission order (step S931). When the last packet of data is transmitted (step S932: Yes), as a termination process, the transmission device transmits a packet with the next sequence number added (step S933). However, since this packet does not require data, it is a so-called empty packet. An empty packet transmitted from the transmission device in this termination processing is particularly referred to as an end confirmation packet.

When the receiving device receives the empty packet (step S942: Yes) while performing the packet receiving process (step S941), it notifies the sequence number of the last received packet (that is, the sequence number of the empty packet). The number notification packet to be transmitted is transmitted to the transmission device (step S943). Since this number notification packet does not require data, it is a so-called empty packet.

When the transmitting apparatus receives the number notification packet (step S934: Yes), the receiving apparatus determines that no retransmission request for the data packet is generated since the receiving apparatus has received all the packets constituting the series of data. The transmission packet stored in the transmission buffer 141 can be purged (discarded) (step S936). The transmitting apparatus does not particularly need to reply to the number notification packet from the receiving apparatus.

Similarly, the receiving device can restore the original data using the packets by confirming that all the packets constituting the series of data have been received. Then, the received packets so far can be purged from the reception buffer 142 (step S944).

In this termination process, the transmission device waits for a notification from the reception device, and retransmits an empty packet repeatedly at predetermined time intervals until there is a notification (step S935: Yes). However, these processes are performed after transmitting all the packets constituting a series of data, and do not lead to a decrease in throughput during data transmission.

If there is data to be transmitted next (step S937: Yes), the next data can be transmitted in parallel with the termination processing after the end of transmission of a series of data (step S938). Therefore, it is possible to prevent a decrease in throughput. At this time, the sequence number may be continued to be incremented or reset.

FIG. 13 is a sequence diagram showing an example of a processing procedure of termination processing according to the embodiment of the present invention. In this example, when a total of five packets are transmitted, it is assumed that three packets are transmitted at one connection interval.

First, the first three packets transmitted from the transmitting device are normally received by the receiving device. In the next connection interval, packets # 4 and # 5 are transmitted. Since the last packet # 5 has been transmitted, an empty packet to which sequence number # 6 is added is transmitted as an end confirmation packet (831).

In this example, it is assumed that the number notification packet is not returned from the receiving device even after a predetermined time has elapsed since the transmission of the end confirmation packet (831). Therefore, the transmitting apparatus determines that the end confirmation packet has not been received, and transmits again the empty packet to which sequence number # 6 is added (832).

The receiving apparatus that has received the end confirmation packet returns an empty packet with the sequence number # 6 of the last received packet as a number notification packet (843). Then, it is determined that the reception of the data has been completed, the original data is restored from the packet stored in the reception buffer 142, and the packet stored in the reception buffer 142 is purged (844).

The transmission device that has received the number notification packet determines that the transmission of the data has been completed, and purges the packet stored in the transmission buffer 141 (834). Note that the transmission of the next data can be started even after the purge is completed (835).

As described above, according to the embodiment of the present invention, by transmitting a plurality of packets from a transmission device without confirming reception at the reception device, the packets are retransmitted according to a retransmission request from the reception device. Therefore, it is possible to avoid the performance degradation associated with the communication error recovery process.

The above-described embodiment shows an example for embodying the present invention, and the matters in the embodiment and the invention-specific matters in the claims have a corresponding relationship. Similarly, the matters specifying the invention in the claims and the matters in the embodiment of the present invention having the same names as the claims have a corresponding relationship. However, the present invention is not limited to the embodiment, and can be embodied by making various modifications to the embodiment without departing from the scope of the invention.

Further, the processing procedure described in the above embodiment may be regarded as a method having a series of these procedures, and a program for causing a computer to execute these series of procedures or a recording medium storing the program. You may catch it. As this recording medium, for example, a CD (Compact Disc), an MD (MiniDisc), a DVD (Digital Versatile Disc), a memory card, a Blu-ray disc (Blu-ray (registered trademark) Disc), or the like can be used.

DESCRIPTION OF SYMBOLS 101,102 Wireless communication apparatus 110 Processor 111 Packet generation part 112 Retransmission processing part 113 Retransmission request part 114 Restoration part 120 Memory 130 Communication control part 140 Transmission / reception buffer 141 Transmission buffer 142 Reception buffer 150 Reception part 160 Transmission part 170 Antenna switch 180 Antenna

Claims (10)

A wireless communication system for transmitting and receiving data between a first wireless communication device and a second wireless communication device,
The first wireless communication device is:
A packet generator that divides data and generates a plurality of packets by adding a sequence number indicating a transmission order to each of the divided data;
A transmitting unit that continuously transmits the plurality of packets to the second wireless communication device in accordance with the transmission order without confirming reception in the second wireless communication device;
A transmission buffer for storing the plurality of transmitted packets;
A retransmission processing unit that retransmits a packet designated by a retransmission request from the second wireless communication device among the plurality of transmitted packets;
The second wireless communication device is:
A receiving unit for receiving the plurality of packets transmitted from the first wireless communication device;
A reception buffer for storing the received plurality of packets;
A retransmission request unit that identifies a packet that has failed to be received based on a sequence number of the plurality of received packets, and that makes a retransmission request for only the packet that has failed to be received to the first wireless communication device; A wireless communication system comprising: In the second wireless communication device,
When the retransmission request unit detects that there is a packet that has failed to be received, the packet that has failed to be received without discarding packets received after the packet that has failed to be received stored in the reception buffer. The wireless communication system according to claim 1, wherein a packet including a sequence number of the packet that has failed to be received is transmitted to the first wireless communication apparatus so that the retransmission request is made only for the first wireless communication apparatus. In the first wireless communication device,
The transmitter, after transmitting all the packets generated from the data, transmits an end confirmation packet with a sequence number next to the last transmitted packet,
The transmission buffer discards a packet generated from the data among the plurality of packets to be stored after receiving a notification confirming that the completion confirmation packet has been received from the second wireless communication device,
In the second wireless communication device,
When the end confirmation packet is received,
The reception unit returns a notification confirming that the completion confirmation packet has been received to the first wireless communication device when the completion confirmation packet is received,
The wireless communication system according to claim 1, wherein the reception buffer discards a packet generated from the data among the plurality of packets to be stored. In the first wireless communication device,
The transmission unit retransmits the end confirmation packet when not receiving a notification confirming that the end confirmation packet has been received during a predetermined period after the end confirmation packet is transmitted. Item 4. The wireless communication system according to Item 3. The second wireless communication apparatus further includes a restoration unit that restores the data from the divided data included in a plurality of packets stored in the reception buffer when the completion confirmation packet is received. The wireless communication system described. The first wireless communication apparatus includes: a first processor that executes a first application for performing operations of dividing the data, adding the sequence number, and retransmitting the designated packet; A first memory for storing one application;
The second wireless communication apparatus includes: a second processor that executes a second application for executing the operations of identifying the packet that has failed to be received, requesting the retransmission, and restoring the data; The wireless communication system according to claim 5, further comprising a second memory for storing two applications. In a wireless communication system that transmits and receives data between a first wireless communication device and a second wireless communication device,
A packet generation procedure in which the first wireless communication apparatus divides data and generates a plurality of packets by adding a sequence number indicating a transmission order to each of the divided data;
A transmission procedure in which the first wireless communication device continuously transmits the plurality of packets to the second wireless communication device in accordance with the transmission order without confirming reception in the second wireless communication device; ,
A reception procedure in which the second wireless communication device receives the plurality of packets transmitted from the first wireless communication device;
The second wireless communication apparatus identifies a packet that has failed to be received based on a sequence number of the plurality of received packets, and only the packet that has failed to be received with respect to the first wireless communication apparatus A retransmission request procedure for making a retransmission request;
Wireless communication in a wireless communication system, wherein the first wireless communication device includes a retransmission processing procedure for retransmitting a packet designated by the retransmission request from the second wireless communication device among the plurality of transmitted packets Method. A packet generator that divides data and generates a plurality of packets by adding a sequence number indicating a transmission order to each of the divided data;
A transmission unit that continuously transmits the plurality of packets to the reception-side wireless communication device according to the transmission order without performing reception confirmation in the reception-side wireless communication device;
A transmission buffer for storing the plurality of transmitted packets;
A wireless communication apparatus comprising: a retransmission processing unit configured to retransmit a packet designated by a retransmission request from the reception-side wireless communication apparatus among the plurality of transmitted packets. The transmitter, after transmitting all the packets generated from the data, transmits an end confirmation packet with a sequence number next to the last transmitted packet,
The transmission buffer discards a packet generated from the data among the plurality of stored packets after receiving a notification confirming that the end confirmation packet has been received from the wireless communication device on the receiving side. The wireless communication device according to 8. A first processor that executes a first application for performing the operations of dividing the data, adding the sequence number, and retransmitting the designated packet;
The wireless communication apparatus according to claim 8, further comprising a first memory for storing the first application.

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