JP2023035168A - Wireless communication device, communication control method, and program - Google Patents

Abstract

To provide a wireless communication device, a communication control method, and a program capable of reducing frame loss while increasing an amount of data that can be transmitted within a unit time.SOLUTION: A wireless communication device 1 includes: a size identification unit 112 that identifies a transmission data size included in a frame to be transmitted to a wireless communication device 2; a symbol number calculation unit 113 that calculates the number of symbols required to transmit the frame, for each of multiple types of modulation and coding schemes (MCSs), based on the transmission data size and a symbol unit data size that can be included per symbol for each of the multiple types of MCSs; and a selection unit 114 that identifies an MCS by which the calculated symbol number is minimum from the multiple types of MCSs, and when the identified MCSs are plural, selects an MCS by which the symbol unit data size is minimum from the plurality of identified MCSs.SELECTED DRAWING: Figure 3

Description

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

Communication with MCS selected from multiple coding schemes and modulation schemes (MCS: Modulation and Coding Scheme) based on the transmission success rate of frames corresponding to each of multiple MCSs to other wireless communication devices A wireless communication device has been proposed (see Patent Document 1, for example).

JP 2018-093296 A

By the way, in a wireless communication device such as that described in Patent Document 1, data that can be transmitted within a unit time at a high communication rate while maintaining a high rate of successful transmission of frames to other wireless communication devices. It is requested that the amount be increased.

The present invention has been made in view of the above reasons, and aims to provide a wireless communication device, a communication control method, and a program capable of reducing frame loss while increasing the amount of data that can be transmitted within a unit time. aim.

In order to achieve the above object, a wireless communication device according to the present invention includes:
a size identifying unit that identifies a transmission data size included in a transmission data frame to be transmitted to another wireless communication device;
For each of a plurality of types of modulation and coding schemes set in advance, the transmission is performed based on the transmission data size and a symbol unit data size that can be included per symbol in each of the plurality of types of modulation and coding schemes. a symbol number calculator that calculates the number of symbols required to transmit a data frame;
a selection unit that selects a modulation and coding scheme that minimizes the calculated number of symbols from among the plurality of types of modulation and coding schemes,
When there are a plurality of modulation and coding schemes with the smallest calculated number of symbols, the selection unit selects the largest symbol unit data size among the plurality of modulation and coding schemes with the smallest number of symbols. Select one modulation and coding scheme excluding the modulation and coding scheme.

From another point of view, the communication control method according to the present invention includes:
identifying a transmission data size included in a transmission data frame to be transmitted to another wireless communication device;
For each of a plurality of types of modulation and coding schemes set in advance, the transmission is performed based on the transmission data size and a symbol unit data size that can be included per symbol in each of the plurality of types of modulation and coding schemes. calculating the number of symbols required to transmit the data frame;
a step of selecting a modulation and coding scheme that minimizes the calculated number of symbols from among the plurality of types of modulation and coding schemes;
If there are a plurality of modulation and coding schemes with the smallest calculated number of symbols, the modulation and coding scheme with the largest symbol unit data size is selected from among the plurality of modulation and coding schemes with the smallest number of symbols. and selecting one modulation and coding scheme to exclude.

From another point of view, the program according to the present invention is
the computer,
a size identification unit that identifies a transmission data size included in a transmission data frame to be transmitted to another wireless communication device;
For each of a plurality of types of modulation and coding schemes set in advance, the transmission is performed based on the transmission data size and a symbol unit data size that can be included per symbol in each of the plurality of types of modulation and coding schemes. a symbol number calculator that calculates the number of symbols required to transmit a data frame;
If a modulation and coding scheme with the smallest calculated number of symbols is selected from among the plurality of types of modulation and coding schemes, and there are a plurality of modulation and coding schemes with the smallest calculated number of symbols, A selection unit that selects one modulation and coding scheme from among a plurality of modulation and coding schemes with the smallest number of symbols, excluding the modulation and coding scheme with the largest symbol unit data size;
function as

According to the wireless communication device according to the present invention, the number-of-symbols calculation unit uses the transmission data size included in the transmission data frame to be transmitted to another wireless communication device for each of a plurality of preset modulation and coding schemes. and the symbol unit data size that can be included in one symbol for each of the plurality of types of modulation and coding schemes, the number of symbols required to transmit the transmission data frame is calculated. Also, the selection unit selects a modulation and coding scheme that minimizes the calculated number of symbols from among a plurality of types of modulation and coding schemes. Then, when there are a plurality of modulation and coding schemes with the smallest calculated number of symbols, the selection unit can include per symbol from among the plurality of modulation and coding schemes with the smallest number of symbols. One modulation and coding scheme is selected except for the modulation and coding scheme that maximizes the symbol unit data size. As a result, it is possible to reduce the symbol unit data size in transmitting the transmission data frame as much as possible while reducing the number of symbols required for transmission of the transmission data frame. Therefore, the number of symbols required for transmitting a transmission data frame is reduced to increase the amount of data that can be transmitted within a unit time, and at the same time, the frame loss is reduced by minimizing the data size per symbol in transmission of the transmission data frame as much as possible. can be reduced.

It is a figure which shows the structure of the communication system which concerns on embodiment of this invention. 1 is a diagram showing a hardware configuration of a wireless communication device according to an embodiment; FIG. 1 is a diagram showing a functional configuration of a wireless communication device according to an embodiment; FIG. FIG. 4 is a diagram showing the content of information stored in a DBPS storage unit according to the embodiment; 7 is a flow chart showing the flow of communication control processing executed by the wireless communication device according to the embodiment; (A) is a diagram showing the number of symbols corresponding to each MCS when the wireless communication device according to the embodiment transmits 100-byte information; (C) is a diagram showing the number of symbols corresponding to each MCS when the radio communication apparatus according to the embodiment transmits 6-byte information. be. FIG. 10 is a diagram showing the content of information stored in a DBPS storage unit according to a modification; FIG. 10 is a diagram showing the content of information stored in a DBPS storage unit according to a modification;

A radio communication apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings. A radio communication apparatus according to the present embodiment includes a data size identification unit that identifies the transmission data size included in a frame to be transmitted to another radio communication apparatus, a symbol number calculation unit, and a plurality of preset types of a selection unit that selects an MCS suitable for communication with another wireless communication device from among modulation and coding schemes (hereinafter referred to as “MCS (Modulation and Coding Scheme)”). Here, for each of the plurality of types of MCS, the number-of-symbols calculation unit calculates the number of symbols necessary for transmitting the frame based on the transmission data size and the symbol unit data size that can be included per symbol in each MCS. number of symbols. In addition, the selection unit identifies an MCS with the smallest calculated number of symbols from among a plurality of types of MCS, and when there are a plurality of identified MCSs, the symbol unit data size is Choose the smallest MCS.

For example, as shown in FIG. 1, wireless communication devices 1 and 2 according to the present embodiment are used to construct a wireless LAN (Local Area Network) to which a PC (Personal Computer) 3 having a wireless communication function is connected. be done. A wireless communication device 1 functions as a station connected to a wide area network NW1 such as the Internet via a data circuit terminating equipment (hereinafter referred to as "DCE") 4, for example. Also, the wireless communication device 2 functions as an access point that relays data transmitted and received between the PC 3 and the wireless communication device 1, for example. Here, the PC 3 acquires data from a server (not shown) connected to the wide area network NW1 via the DCE 4 and the wireless communication devices 1 and 2, or obtains data from the wireless communication devices 2 and 1, the DCE 4 and the wide Data is transmitted to the server via the network NW1.

Next, as shown in FIG. 2, the wireless communication apparatuses 1 and 2 according to the present embodiment include a CPU (Central Processing Unit) 101, a main storage section 102, an auxiliary storage section 103, a wireless module 105, Prepare. The wireless communication device 1 also has an interface (not shown) connected to the DCE 4 by wire. The main storage unit 102 is composed of a volatile memory such as a RAM (Random Access Memory) and is used as a work area for the CPU 101 . The auxiliary storage unit 103 is composed of a nonvolatile memory such as a ROM (Read Only Memory), SSD (Solid State Drive), HDD (Hard Disk Drive), or the like, and is used to control the wireless communication devices 1 and 2. Memorize the program. The CPU 101 loads a program stored in the auxiliary storage unit 103 into the main storage unit 102 and executes it.

The wireless module 105 communicates using a communication method conforming to the IEEE 802.11 wireless LAN standard, for example. The wireless module 105 has an antenna (not shown), a receiver circuit (not shown), a signal processor (not shown), and a transmitter circuit (not shown). The receiving circuit receives a radio signal via an antenna, demodulates a signal corresponding to the received radio signal to generate a baseband signal, and outputs the baseband signal to the signal processing unit. The transmission circuit generates a radio signal corresponding to a transmission frame by modulating a carrier signal using a baseband signal input from the signal processing unit, and transmits the generated radio signal via an antenna. Here, based on the MCS information instructed by the CPU 101, the transmission circuit modulates the carrier signal with a modulation scheme corresponding to the MCS information. The signal processing unit is implemented by, for example, a DSP (Digital Signal Processor), generates a frame corresponding to the radio signal received by the receiving circuit based on the baseband signal input from the receiving circuit, and outputs the frame to the bus 109 . The signal processing unit also generates a baseband signal based on the frame transferred from the main storage unit 102 via the bus 109 and outputs the baseband signal to the transmission circuit.

In the wireless communication device 1, the CPU 101 reads the program stored in the auxiliary storage unit 103 into the main storage unit 102 and executes it, thereby obtaining a frame acquisition unit 111, a size identification unit 112, and a symbol number calculation unit as shown in FIG. It functions as a section 113 , a selection section 114 and a frame transfer section 115 . The same applies to the wireless communication device 2 as well. Further, the auxiliary storage unit 103 shown in FIG. 2 has a DBPS (Data Bit Per Symbol) storage unit 131 . The DBPS storage unit 131 stores a DBPS, which is a symbol unit data size that can be included in one symbol, in association with an MCS identification number that identifies each MCS, as shown in FIG. 4, for example. The example shown in FIG. 4 shows an example in which the wireless communication devices 1 and 2 transmit frames with one stream and a bandwidth of 4 MHz. Further, the main storage unit 102 shown in FIG. 2 also functions as a frame buffer 121 for temporarily storing frames obtained from the wireless module 105 or DCE 4, as shown in FIG.

The frame acquisition unit 111 of the wireless communication device 1 acquires a frame transmitted to the wireless communication device 2 from the interface connected to the wireless module 105 or DCE4. On the other hand, the frame acquisition unit 111 of the wireless communication device 2 acquires a transmission data frame transmitted from the wireless module 105 toward the wireless communication device 1 . The frame acquisition units 111 of the wireless communication devices 1 and 2 respectively store the acquired transmission data frames in the frame buffers 121 .

Size identifying section 112 identifies a transmission data size, which is the size of data included in a frame stored in frame buffer 121 . Here, the size identification unit 112 of the wireless communication device 1 identifies the transmission data size of the transmission data frame to be transmitted to the wireless communication device 2 . On the other hand, size identifying section 112 of wireless communication device 2 identifies the transmission data size of a transmission data frame to be transmitted to wireless communication device 1 . Then, size identifying section 112 notifies transmission data size information indicating the identified transmission data size to number-of-symbols calculating section 113 .

Number-of-symbols calculation section 113 refers to the DBPS information corresponding to each MCS stored in DBPS storage section 131, and determines the transmission data size indicated by the transmission data size information notified from size identification section 112 for each of a plurality of types of MCS. and the DBPS of each of the multiple types of MCS, the number of symbols required to transmit the transmission data frame is calculated. Specifically, the number-of-symbols calculation section 113 calculates the number of symbols SYM required to transmit a transmission data frame for each of a plurality of types of MCS using the relational expression (1) below.

Here, Nt indicates the transmission data size (number of bits) included in the transmission data frame, and Ndbps indicates the symbol unit data size (number of bits) that can be included in one symbol. Roundup(*) indicates a function that rounds up the fractional part of the argument and outputs it. In addition, symbol number calculation section 113 notifies selection section 114 of symbol number information indicating the calculated number of symbols SYM corresponding to each MCS.

Based on the number-of-symbols information notified from number-of-symbols calculating section 113, selection section 114 specifies, from among multiple types of MCS, the MCS with the smallest calculated number of symbols. Then, when there are a plurality of specified MCSs, the selection unit 114 selects the MCS with the smallest DBPS from among the plurality of specified MCSs. Then, selection section 114 generates MCS information indicating the selected MCS and transfers it to wireless module 105 . After transferring the generated MCS information to wireless module 105 , selecting section 114 notifies frame transfer section 115 of MCS transfer notification information indicating that the MCS information has been transferred to wireless module 105 .

Frame transfer section 115 , upon being notified of the MCS transfer notification information from selection section 114 , transfers the transmission data frame stored in frame buffer 121 to wireless module 105 .

Next, the communication control processing executed by the wireless communication devices 1 and 2 according to this embodiment will be described in detail with reference to FIGS. 5 and 6. FIG. Note that the values shown in FIG. 6 in this embodiment conform to the IEEE802.11ah standard, but are not limited to this. This communication control process is started, for example, when the wireless communication devices 1 and 2 are powered on. First, in the case of the wireless communication device 1, the frame acquisition unit 111 determines whether or not a transmission data frame has been acquired from the wireless communication device 1 or the DCE 4 via the wireless module 105 or the interface (step S1). Note that in the case of the wireless communication device 2 , the frame acquisition unit 111 determines whether or not a frame has been acquired from the wireless communication device 2 via the wireless module 105 . Here, as long as the frame acquisition unit 111 determines that no frame has been acquired (step S1: No), the process of step S1 is repeatedly executed.

On the other hand, when determining that the transmission data frame has been acquired (step S1: Yes), the frame acquisition unit 111 causes the frame buffer 121 to store the acquired transmission data frame. Then, the size specifying unit 112 specifies the transmission data size of the transmission data frame stored in the frame buffer 121 (step S2). Here, size identifying section 112 notifies transmission data size information indicating the identified transmission data size to number-of-symbols calculating section 113 .

Next, for each of the multiple types of MCS, symbol number calculation section 113 performs transmission based on the transmission data size indicated by the transmission data size information notified from size specifying section 112 and the DBPS of each of the multiple types of MCS. The number of symbols required to transmit the data frame is calculated using the above equation (1) (step S3). Here, the number of symbols of each MCS calculated by the number-of-symbols calculation unit 113 is shown in FIG. When the transmission data size is 170 bytes, it becomes as shown in FIG. 6(B), and when the transmission data size is 6 bytes, it becomes as shown in FIG. 6(C). Then, symbol number calculation section 113 notifies selection section 114 of symbol number information indicating the calculated number of symbols corresponding to each MCS.

Returning to FIG. 5, subsequently, selection section 114 specifies the MCS with the smallest calculated number of symbols from among multiple types of MCS based on the number-of-symbols information notified from number-of-symbols calculation section 113. (Step S4). For example, when the transmission data size is 100 bytes as shown in FIG. 6A, the selection unit 114 identifies MCSs with MCS identification numbers from "5" to "9" (MCSs with two symbols). For example, when the transmission data size is 170 bytes as shown in FIG. 6B, the selection unit 114 identifies only MCSs with an MCS identification number of "9" (MCSs with two symbols). Furthermore, for example, when the transmission data size is 6 bytes as shown in FIG. 6(C), the selection unit 114 identifies all MCSs (MCS with 1 symbol).

Returning to FIG. 5, the selection unit 114 then determines whether or not there are a plurality of MCSs having the minimum number of identified symbols (step S5). Here, it is assumed that the selection unit 114 determines that there is only one MCS with the smallest number of symbols (step 5: No). For example, as indicated by SM2 in FIG. 6B, there is only one MCS with the minimum number of symbols "2". In this case, the process of step S7, which will be described later, is executed, and the MCS information indicating the MCS corresponding to the MSC identification number indicated by SM2 in FIG.

On the other hand, it is assumed that the selection unit 114 determines that there are a plurality of MCSs with the minimum number of specified symbols, as shown in FIG. 5 (step S5: Yes). For example, as shown in FIG. 6(A) or FIG. 6(C), there are multiple MCSs with the minimum number of symbols. In this case, the selection unit 114 selects the MCS with the smallest DBPS from among the plurality of identified MCSs, as shown in FIG. 5 (step S6). Specifically, when the transmission data size is 100 bytes, the selection unit 114 selects an MCS whose DBPS is the minimum value of 432 bits from MCS whose number of symbols is "2", as indicated by SM1 in FIG. Select the MCS with the identification number "5". Further, when the transmission data size is 6 bytes, the selection unit 114 identifies the MCS whose DBPS is the minimum value of 54 bits among all the MCS whose number of symbols is "1", as indicated by SM3 in FIG. 6(C). Select the MCS numbered "0".

Returning to FIG. 5, next, selection unit 114 generates MCS information indicating the selected MCS and transfers it to wireless module 105 (step S7). At this time, after transferring the generated MCS information to wireless module 105 , selecting section 114 notifies frame transfer section 115 of MCS transfer notification information indicating that the MCS information has been transferred to wireless module 105 .

Subsequently, when the selection unit 114 notifies the frame transfer unit 115 of the MCS transfer notification information, the frame transfer unit 115 transfers the transmission data frame stored in the frame buffer 121 to the wireless module 105 (step S8). After that, the process of step S1 is executed again.

By the way, in Japan, there are strict restrictions on the radio transmission time, such as the duty ratio regulation of 10% in the 900 MHz band. For example, when communicating according to the wireless LAN standard of 802.11ah, it is important how to suppress the wireless transmission time under such a restricted environment. When it is desired to transmit a large number of transmission data frames within a unit time, it is common to perform communication using MCS with a high transmission rate. However, when wireless communication is performed using an MCS with a high transmission rate and a large DBPS, it is susceptible to noise, and the probability that a transmission data frame arrives is inferior to an MCS with a low transmission rate and a small DBPS. Furthermore, if the transmission data frame does not arrive, the transmission data frame will be retransmitted, resulting in excessive consumption of the allocated radio transmission time. Also, a wireless communication device conforming to the IEEE 802.11 wireless LAN standard generally automatically selects an MCS with the highest possible transmission rate and attempts transmission. In this case, even in an environment in which it is not appropriate to adopt an MCS with a high transmission rate, transmission is unnecessarily attempted with an MCS with a high transmission rate, so retransmission of transmission data frames occurs frequently. Radio transmission time is wasted.

In contrast, according to radio communication apparatuses 1 and 2 according to the present embodiment, number-of-symbols calculation section 113 calculates the transmission data size included in the transmission data frame and each of the plurality of types of MCS for each of the plurality of types of MCS. The number of symbols required to transmit the transmission data frame is calculated based on the DBPS of . Then, selection section 114 specifies an MCS with the smallest calculated number of symbols from among multiple types of MCS. Here, when there are a plurality of identified MCSs, the selection unit 114 selects the MCS with the minimum DBPS from among the plurality of identified MCSs. This makes it possible to minimize the DBPS in frame transmission while reducing the number of symbols required to transmit a transmission data frame. Therefore, the number of symbols required for transmission of the transmission data frame is reduced to increase the amount of data that can be transmitted within a unit time, and at the same time, the DBPS in the transmission of the transmission data frame is made as small as possible to achieve stable frame transmission. As a result, frame loss can be reduced. Therefore, the frequency of retransmission of transmission data frames is reduced, so that wasteful consumption of the allocated radio transmission time can be suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of the above-described embodiments. For example, if there are multiple MCSs with the smallest number of symbols calculated by the number-of-symbols calculation unit 113, the selection unit 114 selects any MCS with the smallest number of symbols except the MCS with the largest DBPS. One MCS may be selected.

In the embodiment, an example has been described in which each of the wireless communication devices 1 and 2 has only one antenna and performs communication with one stream and a bandwidth of 4 MHz. However, the present invention is not limited to this, and for example, each of the wireless communication devices 1 and 2 may be provided with two antennas and may communicate with four streams and a bandwidth of 16 MHz. In this case, the DBPS storage unit 131 may store, for example, DBPS information as shown in FIG. 7 in association with the MCS identification number. Alternatively, each of the wireless communication devices 1 and 2 may have one antenna as in the embodiment, and may perform communication with one stream and a bandwidth of 1 MHz. In this case, the DBPS storage unit 131 may store, for example, DBPS information as shown in FIG. 8 in association with the MSC identification number. Further, according to such various aspects, the DBPS storage unit 131 may store a plurality of patterns of DBPS information.

In the embodiment, an example has been described in which every time frame acquisition section 111 acquires a transmission data frame, MCS is selected when transmitting the frame. However, the present invention is not limited to this. For example, each time the frame acquisition unit 111 acquires a predetermined reference number of transmission data frames, the size identification unit 112 detects the transmission data of each of the reference number of frames acquired by the frame acquisition unit 111. A size may be specified and an average value or an intermediate value of the specified transmission data size may be calculated. Then, the number-of-symbols calculation section 113 may calculate the number of symbols in each MCS using the average value or intermediate value of the calculated transmission data sizes.

Alternatively, the size specifying unit 112 specifies the transmission data size of each of the transmission data frames acquired by the frame acquiring unit 111 from the preset size specifying time to the previous size specifying time. Then, an average value or an intermediate value of the identified transmission data sizes may be calculated.

According to this configuration, by selecting an MCS with a higher transmission success rate according to the transmission data size, it is possible to suppress the frequency of retransmission in wireless module 105 and reduce the time required to transmit data frames. Therefore, there is an advantage that a large amount of time that can be used for frame transmission can be secured.

Various functions of the wireless communication device 1 according to the present invention can be realized using a computer system having a wireless communication module without using a dedicated system. For example, to a computer connected to a network, a program for executing the above operation is distributed by storing it in a non-temporary recording medium (CD-ROM, etc.) readable by the computer system, and the program is distributed to the computer. By installing it in the system, the wireless communication device 1 that executes the above processes may be configured.

Also, the method of providing the program to the computer is arbitrary. For example, the program may be uploaded to a communication line server and delivered to the computer via the communication line. The computer then launches this program and executes it like any other application under the control of the OS. Thereby, the computer functions as the wireless communication device 1 that executes the above process.

Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these. The present invention includes appropriate combinations of the embodiments and modifications, and appropriate modifications thereof.

The wireless communication device of the present invention is suitable as an access point and station used for wireless LAN.

1, 2: wireless communication device, 3: PC, 4: DCE, 101: CPU, 102: main storage unit, 103: auxiliary storage unit, 105: wireless module, 111: frame acquisition unit, 112: size identification unit, 113 : symbol number calculation unit 114: selection unit 115: frame transfer unit 121: frame buffer 131: DBPS storage unit NW1: network

Claims (5)

a size identifying unit that identifies a transmission data size included in a transmission data frame to be transmitted to another wireless communication device;
For each of a plurality of types of modulation and coding schemes set in advance, the transmission is performed based on the transmission data size and a symbol unit data size that can be included per symbol in each of the plurality of types of modulation and coding schemes. a symbol number calculator that calculates the number of symbols required to transmit a data frame;
a selection unit that selects a modulation and coding scheme that minimizes the calculated number of symbols from among the plurality of types of modulation and coding schemes,
When there are a plurality of modulation and coding schemes with the smallest calculated number of symbols, the selection unit selects the largest symbol unit data size among the plurality of modulation and coding schemes with the smallest number of symbols. selecting one modulation and coding scheme excluding the modulation and coding scheme;
wireless communication device. When there are a plurality of modulation and coding schemes with the smallest calculated number of symbols, the selection unit selects the smallest symbol unit data size among the plurality of modulation and coding schemes with the smallest number of symbols. selecting a modulation coding scheme,
A wireless communication device according to claim 1 . The number-of-symbols calculator calculates, for each of the plurality of types of modulation and coding schemes, Nt (bits) for the data size included in the transmission data frame, and Ndbps (bits) for the data size in symbol units that can be included per symbol. ), where the number of symbols is SYM, the number of symbols is calculated using the relational expression of the following formula (1),
The radio communication device according to claim 1 or 2.

identifying a transmission data size included in a transmission data frame to be transmitted to another wireless communication device;
For each of a plurality of types of modulation and coding schemes set in advance, the transmission is performed based on the transmission data size and a symbol unit data size that can be included per symbol in each of the plurality of types of modulation and coding schemes. calculating the number of symbols required to transmit the data frame;
a step of selecting a modulation and coding scheme that minimizes the calculated number of symbols from among the plurality of types of modulation and coding schemes;
If there are a plurality of modulation and coding schemes with the smallest calculated number of symbols, the modulation and coding scheme with the largest symbol unit data size is selected from among the plurality of modulation and coding schemes with the smallest number of symbols. selecting one modulation and coding scheme except for
Communication control method. the computer,
a size identification unit that identifies a transmission data size included in a transmission data frame to be transmitted to another wireless communication device;
For each of a plurality of types of modulation and coding schemes set in advance, the transmission is performed based on the transmission data size and a symbol unit data size that can be included per symbol in each of the plurality of types of modulation and coding schemes. a symbol number calculator that calculates the number of symbols required to transmit a data frame;
If a modulation and coding scheme with the smallest calculated number of symbols is selected from among the plurality of types of modulation and coding schemes, and there are a plurality of modulation and coding schemes with the smallest calculated number of symbols, A selection unit that selects one modulation and coding scheme from among a plurality of modulation and coding schemes with the smallest number of symbols, excluding the modulation and coding scheme with the largest symbol unit data size;
A program to function as

Images