JP2014207509A - Device and method for transmission timing test, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To test transmission timing in a protocol test.SOLUTION: A test target device (transmission timing test device) 30 acquires from a condition set unit 52 a condition for calculating transmission timing to transmit a radio frame, to calculate the transmission timing in a transmission timing calculation unit 53. A transmitter unit 61 transmits a radio frame on the basis of the transmission timing acquired from the transmission timing calculation unit 53, and measures a carrier sense start time and a communication frame transmission start time. Next, an information acquisition unit 54 acquires the transmission timing, the carrier sense start time and the transmission start time from the transmitter unit 61, to store into a storage unit 56 through a write processing unit 55.

Description

  The present invention relates to a technique for testing transmission timing in a protocol test.

In the protocol test, it is checked whether or not the operation of the test target device to be tested conforms to the standard. The test items include whether commands and data are transmitted and received according to a predetermined procedure between the test target device and the test device that is a communication partner of the test target device, whether the test target device is performing a desired operation, etc. Contains the content to be confirmed. For example, in wireless communication standards such as IEEE (The Institute of Electrical and Electronics Engineers) 802.11, there are the following items as protocol test items.
[1] Data is transmitted and received according to a predetermined sequence scenario.
[2] A radio frame is transmitted and received at a predetermined timing.
[3] The contents of each data satisfy the protocol specifications.

  Further, CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) is used as a protocol adopted in IEEE 802.11. When transmitting a wireless frame based on CSMA / CA, the wireless device performs carrier sense (operation for detecting presence / absence of a wireless signal) for a predetermined period for a channel to be used in advance to avoid collision of the wireless frame. To do. If no other radio signal is detected during carrier sense, the radio device transmits a radio frame after waiting for an IFS (Inter Frame Space) and a backoff time. On the other hand, when the wireless device detects another wireless signal during carrier sense, the wireless device transmits a wireless frame after waiting for the IFS and the backoff time from the time when the transmission end of the wireless signal is detected.

  As described above, when CSMA / CA is used as a protocol, it is necessary to confirm whether or not a radio frame is transmitted according to the IFS and the back-off time in the test related to the item [2], that is, the transmission timing. There is.

  For example, Patent Document 1 discloses a technique for acquiring log information of communication transmitted and received between communication devices and measuring the latency of the communication device based on a time difference between a transmission time and a reception time.

JP 2011-259076 A

  However, in CSMA / CA, the transmission timing is changed on a case-by-case basis depending on whether another radio signal is detected during carrier sense. Further, the length of the IFS and the back-off time can be changed by the user for each type of radio frame. Therefore, there is a problem that it is not possible to clarify whether the time difference is based on a predetermined operation only by obtaining the time difference between the transmission time and the reception time using the technique described in Patent Document 1.

  Accordingly, an object of the present invention is to provide a technique for testing transmission timing in a protocol test.

  In order to solve the above-described problem, the present invention provides a transmission timing test apparatus as a test target apparatus, which obtains a condition for calculating a transmission timing for transmitting a communication frame and calculates the transmission timing. And a transmission unit for transmitting the communication frame based on the transmission timing acquired from the transmission timing calculation unit, and measuring a carrier sense start time and a transmission start time of the communication frame. And an information acquisition unit that acquires the transmission timing, the carrier sense start time, and the transmission start time.

  According to the present invention, transmission timing can be tested in a protocol test.

It is a figure which shows the structural example of the radio | wireless communication test system in this embodiment. It is a figure which shows the function example of a test object apparatus. It is a figure which shows the example of a flow which measures a transmission timing. It is a figure which shows the continuation of the example of a flow which measures a transmission timing. It is a figure which shows the example of a display of the test result of a transmission timing. It is a figure which shows the example of a processing flow which determines the normality of transmission timing. It is a figure which shows the example of a setting value of transmission timing.

  Next, a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings as appropriate.

First, a configuration example of a wireless communication test system in the present embodiment will be described with reference to FIG.
The wireless communication test system 100 includes a test control device 10, a test device 20, and a test target device (transmission timing test device) 30.
The test control apparatus 10 is connected to the test apparatus 20 so as to be communicable, and has a function of transmitting a test mode start request to the test target apparatus 30 via the test apparatus 20 and executing a test start control. Further, the test control device 10 receives the measurement result of the test target device 30 via the test device 20, determines whether or not a radio frame is transmitted and received at a predetermined timing using the measurement result, It has a function of displaying the determination result. The test control device 10 is, for example, a personal computer.

  The test apparatus 20 has a function of performing wireless communication with the test target apparatus 30 via the antenna 40 using a predetermined protocol. Further, the test apparatus 20 is communicably connected to the test control apparatus 10, transmits a test mode start request received from the test control apparatus 10 to the test target apparatus 30, and receives the measurement result received from the test target apparatus 30. It has a function to transmit to the test control apparatus 10. The test apparatus 20 has a function of transmitting a test mode end notification to the test target apparatus 30 after a predetermined sequence scenario has elapsed when the test apparatus 20 starts its own test mode.

  The device under test 30 is a device to be tested and has a function of measuring transmission timing. The test target device 30 has a function of performing wireless communication with the test device 20 via the antenna 40 using a predetermined protocol. Further, the test target device 30 has a function of receiving the request for starting the test mode transmitted from the test control device 10 via the test device 20 and starting the test mode. The test target device 30 has a function of receiving a test mode end notification from the test device 20 and transmitting a measurement result to the test device 20.

  In the present embodiment, a case of the wireless communication standard IEEE802.11ad will be described as an example of a standard that includes a test item for confirming whether the test target device 30 transmits a wireless frame at a specified transmission timing. In the wireless communication standard IEEE802.11ad, it is necessary to perform a collision avoidance operation of a radio frame defined by CSMA / CA when transmitting a radio frame. As a part of the procedure, it is obliged to confirm (carrier sense) that, immediately before the radio frame transmission, other radio apparatuses are not transmitting radio frames of the same channel for a certain period on the channel to be used. The time length for executing this carrier sense is the sum of the IFS and the back-off time, and these time lengths are defined in the standard.

  In this embodiment, the transmission timing is measured by mounting the transmission timing measurement function in advance on the test target device 30. Further, since the time length of carrier sense differs depending on the frame type of the radio frame, the frame type is also acquired in accordance with the measurement of the transmission timing.

  Next, a function example of the test target apparatus 30 will be described with reference to FIG. However, although functions related to transmission timing measurement are shown in FIG. 2, descriptions of other functions are omitted.

  The test target device 30 includes a measurement test control unit 51, a condition setting unit 52, a transmission timing calculation unit 53, an information acquisition unit 54, a writing processing unit 55, and a storage unit 56 as functions related to transmission timing measurement. The test target device 30 includes a transmission unit 61 and a reception unit 62 as functions related to wireless communication.

  The test target device 30 includes a microcomputer, and an application program stored in the storage unit 56 is developed in the memory of the microcomputer to embody the functions of the units 51 to 55.

  The measurement test control unit 51 has a function of receiving a request for starting a test mode transmitted from the test control device 10 via the test device 20 and the receiving unit 62 and starting the test mode. In addition, the measurement test control unit 51 has a function of generating a radio frame and transmitting it to the transmission unit 61 based on a predetermined sequence scenario when the test mode is activated. In addition, the measurement test control unit 51 has a function of reading the measurement result stored in the storage unit 56 and transmitting it to the transmission unit 61 when receiving a notification of the end of the test mode.

  The condition setting unit 52 has a function of setting the EDCA Parameter Set element received from the test apparatus 20 in the transmission timing calculation unit 53. Here, the EDCA Parameter Set element will be described with reference to FIG.

As shown in FIG. 6, the EDCA Parameter Set element includes an access category (including TID), AIFSN, and ECWmin as parameters.
The access category includes AC_VO (audio), AC_VI (video), AC_BE (best effort), and AC_BK (background). TID is a priority identifier, and indicates that the higher the numerical value, the higher the priority. The higher the priority, the longer the transmission of the radio frame is not waited. AIFSN is a parameter for determining the numerical value of IFS, and the larger the numerical value, the larger the IFS. ECWmin is a parameter that determines the maximum value of the back-off time, and the maximum value of the back-off time increases as the numerical value increases.

  In addition to the above parameters, FIG. 6 shows the IFS and backoff time range. These numerical values are values calculated using AIFSN or ECWmin. In the following description, the IFS illustrated in FIG. 6 may be referred to as a “default IFS”, and the back-off time illustrated in FIG. 6 may be referred to as a “default back-off time”.

  Returning to FIG. 2, the transmission timing calculation unit 53 uses the EDCA Parameter Set element set by the condition setting unit 52 as a “condition for calculating the transmission timing”, calculates the IFS and the backoff time, and calculates the calculated transmission. It has a function of transmitting conditions for calculating timing and transmission timing to the transmission unit 61. The conditions for calculating the transmission timing are, for example, the access category (type of radio frame), AIFSN, and ECWmin shown in FIG.

  The information acquisition unit 54 transmits a transmission timing, a condition for calculating transmission timing, a type of radio frame (hereinafter also referred to as a frame type), a carrier sense start time, and a frame transmission start time for the radio frame transmitted from the transmission unit 61. (Also referred to as transmission start time) is acquired as information regarding transmission timing. Here, the reason for acquiring the type of the radio frame is that the permissible range value of the transmission timing is determined for each type of the radio frame, and therefore it is necessary to specify the type of the radio frame.

The write processing unit 55 has a function of storing, in the storage unit 56, information related to transmission timing acquired by the information acquisition unit 54 (transmission timing information groups 31, 32, and 33 described later).
The storage unit 56 is a memory, a hard disk, or the like, and stores information related to transmission timing acquired by the information acquisition unit 54, an application program, and the like.

The transmission unit 61 is a communication interface and has a function of receiving a condition for calculating transmission timing and transmission timing from the transmission timing calculation unit 53 and transmitting a radio frame via the antenna 40 so as to satisfy the transmission timing. .
The receiving unit 62 is a communication interface, and has a function of receiving a radio frame via the antenna 40 and transmitting it to the measurement test control unit 51.

Next, an example of a flow for measuring the transmission timing will be described with reference to FIGS. 3A and 3B (see FIGS. 1 and 2 as appropriate).
In step S301 shown in FIG. 3A, the test apparatus 20 and the test target apparatus 30 execute an authentication connection procedure based on IEEE802.11ad. Specifically, the test apparatus 20 transmits an EDCA Parameter Set element to the test target apparatus 30 in order to set a carrier sense time. The condition setting unit 52 of the test target apparatus 30 sets a condition for calculating the transmission timing in the transmission timing calculation unit 53 based on the EDCA Parameter Set element.

In step S <b> 302, the test control apparatus 10 transmits a test start request indicating a request for starting a test mode of transmission timing to the test apparatus 20.
In step S303, the test apparatus 20 includes a transmission start test start request in a radio frame, and transmits the test start request frame to the test target apparatus 30.

In step S304, the measurement test control unit 51 of the test target apparatus 30 receives the test start request frame via the reception unit 62, and activates the test mode (side under test).
In step S <b> 305, the measurement test control unit 51 transmits a test start response frame to the test apparatus 20 via the transmission unit 61.

  In step S306, the test apparatus 20 receives the test start response frame via the receiving unit 62 and activates the test mode (test side).

  In step S307, the measurement test control unit 51 of the test target apparatus 30 transmits a QoS Data frame [SeqNo = 10, TID = 0] to the test apparatus 20 via the transmission unit 61 according to a predetermined sequence scenario. Before the transmission, the transmission timing calculation unit 53 of the test target device 30 transmits the calculated transmission timing and the conditions for calculating the transmission timing to the transmission unit 61. SeqNo is information for identifying a frame.

  In step S 308, the information acquisition unit 54 of the test target apparatus 30 acquires the transmission timing information group 31 from the transmission unit 61 and stores it in the storage unit 56 via the write processing unit 55. Specifically, the transmission timing information group 31 includes frame type: QoS Data, SeqNo = 10, TID = 0, IFS = 18 μs, backoff time = 20 μs, carrier sense start time: t1, and frame transmission start time: t2. is there.

In step S309, the test apparatus 20 transmits an ACK frame to the test target apparatus 30.
In step S <b> 310, the test apparatus 20 transmits a QoS Data frame [SeqNo = 20, TID = 0] to the test target apparatus 30.

  3B, in step S311, the measurement test control unit 51 of the test target apparatus 30 transmits an ACK frame [SeqNo = 20] to the test apparatus 20 via the transmission unit 61 according to a predetermined sequence scenario. . Before this transmission, the transmission timing calculation unit 53 of the test target device 30 transmits the calculated transmission timing and the conditions for calculating the transmission timing to the transmission unit 61.

  In step S <b> 312, the information acquisition unit 54 of the test target apparatus 30 acquires the transmission timing information group 32 from the transmission unit 61 and stores it in the storage unit 56 via the write processing unit 55. Specifically, the transmission timing information group 32 includes frame type: ACK, SeqNo = 20, TID = −, IFS = 3 μs, backoff time = −, carrier sense start time: t3, and frame transmission start time: t4. .

  In step S313, the measurement test control unit 51 of the test target apparatus 30 transmits a QoS Data frame [SeqNo = 30, TID = 1] to the test apparatus 20 via the transmission unit 61 according to a predetermined sequence scenario. Before this transmission, the transmission timing calculation unit 53 of the test target device 30 transmits the calculated transmission timing and the conditions for calculating the transmission timing to the transmission unit 61.

  In step S <b> 314, the information acquisition unit 54 of the test target apparatus 30 acquires the transmission timing information group 33 from the transmission unit 61 and stores it in the storage unit 56 via the write processing unit 55. Specifically, the transmission timing information group 33 includes frame type: QoS Data, SeqNo = 30, TID = 1, IFS = 23 μs, backoff time = 100 μs, carrier sense start time: t5, and frame transmission start time: t6. is there.

In step S315, the test apparatus 20 transmits an ACK frame to the test target apparatus 30.
In step S316, the test apparatus 20 transmits a test end notification frame to the test target apparatus 30 via the transmission unit 61 when the operation of the predetermined sequence scenario ends. The measurement test control unit 51 of the test target apparatus 30 receives the test end notification frame via the reception unit 62.

In step S317, the measurement test control unit 51 of the test target apparatus 30 acquires the transmission timing information groups 31, 32, and 33 stored in the storage unit 56, generates a test result notification frame including these pieces of information, The data is transmitted to the test apparatus 20 via the transmission unit 61.
In step S318, the measurement test control unit 51 of the test target apparatus 30 ends the test mode (test target side).

In step S319, the test apparatus 20 receives the test result notification frame, and transmits the transmission timing information groups 31, 32, and 33 included in the test result notification frame to the test control apparatus 10 as a test result notification. The test control apparatus 10 receives the transmission timing information groups 31, 32, and 33 included in the test result notification.
In step S320, the test apparatus 20 ends the test mode (test side).

  In step S321, the test control apparatus 10 determines whether or not the measurement results of the transmission timing information groups 31, 32, and 33 included in the test result notification satisfy the value range determined by the EDCA Parameter Set element. The test result including the determination result is displayed on a display device (not shown).

FIG. 4 shows a display example of a transmission timing test result as a time chart 70. However, in FIG. 4, not only the test target device 30 but also the test device 20 displays the test results when the function of measuring the transmission timing is provided.
In FIG. 4, the horizontal axis represents time, and the determination result and the transmission timing setting state are displayed in the uppermost balloon in the vertical axis direction. Also, in the middle of the vertical axis, for the transmission timing for the device under test 30, the arrow with an arrow head of “▲” indicates the length of the measured IFS, and the arrow head has an “形” shape. The arrow represents the length of the measured backoff time, and the rectangle represents the transmitted radio frame. At the bottom of the vertical axis direction, a radio frame transmitted in a rectangle is displayed at the transmission timing targeted for the test apparatus 20.

In FIG. 4, three balloons are displayed. From the left side, information on transmission timing and determination results corresponding to the transmission timing information group 31, the transmission timing information group 32, and the transmission timing information group 33 are shown. . Also, each of the times t1, t2, t3, t4, t5, and t6 shown in FIG. 4 represents either the carrier sense start time or the frame transmission start time shown in FIG. 3A or FIG. 3B.
Here, an example of a processing flow for determining normal transmission timing will be described with reference to FIG. 5 (see FIGS. 1 and 3B as appropriate).

In step S501, the test control apparatus 10 acquires information on the measured transmission timing (that is, transmission timing information groups 31, 32, and 33) from the test apparatus 20. This process corresponds to the process of step S319 shown in FIG. 3B.
In step S502, the test control apparatus 10 determines whether the measured IFS satisfies the “default IFS” shown in FIG. 6 (indicated as “IFS satisfied?” In FIG. 5). When satisfied, the measured IFS and the “predetermined IFS” substantially coincide with each other.
If it is determined that the user is satisfied (Yes in step S502), the process proceeds to step S503. If it is determined that the user is not satisfied (No in step S502), the process proceeds to step S508.

In step S503, the test control apparatus 10 determines whether or not the measured back-off time satisfies the “default back-off time” shown in FIG. 6 (in FIG. 5, “Is the back-off time satisfied? "). When satisfied, the measured back-off time is equal to or less than the maximum value of the “predetermined back-off time”.
If it is determined that the user is satisfied (Yes in step S503), the process proceeds to step S504. If it is determined that the user is not satisfied (No in step S503), the process proceeds to step S508.

In step S504, the test control apparatus 10 calculates the difference between the carrier sense start time and the frame transmission start time and sets it as the difference time S.
In step S505, the test control apparatus 10 calculates the maximum value of the total time of the “predetermined IFS” and the “predetermined backoff time”, and sets the maximum value R as the total time.

In step S506, the test control apparatus 10 determines whether or not the difference time S is greater than or equal to the “predetermined IFS” and less than or equal to the maximum value R of the total time.
If the determination result in step S506 is true (Yes in step S506), the process proceeds to step S507. If the determination result in step S506 is false (No in step S506), the process proceeds to step S508.

In step S507, the test control apparatus 10 determines that it is normal.
In step S508, the test control apparatus 10 determines that it is not normal.

Specifically, the processing flow shown in FIG. 5 is applied to the case of the transmission timing information group 31 (in the case of AC_BE shown in FIG. 6) and will be described below (see FIGS. 3A and 6 as appropriate).
The test control apparatus 10 first determines whether or not the measured IFS (= 18 μs) satisfies the “predetermined IFS” (= 18 μs) (step S502). Then, the test control apparatus 10 determines that the measured IFS (= 18 μs) satisfies the “default IFS” (= 18 μs) (Yes in step S502), and then the measured backoff It is determined whether the time (= 20 μs) satisfies the “predetermined back-off time” (≦ 75 μs) (step S503).

And it determines with being satisfied (it is Yes at step S503), and the test control apparatus 10 carries out difference time S (step S504) of carrier sense start time t1 and frame transmission start time t2, and "default IFS". The maximum time R of the total time R (= 18 + 75 = 93 μs) (step S505) is compared with the “predetermined backoff time”, and the difference time S is not less than the “predetermined IFS” and not more than the maximum value R of the total time. It is determined whether or not (step S506).
Next, when it is determined that the difference time S is greater than or equal to the “predetermined IFS” (= 18 μs) and less than the maximum value R (= 93 μs) of the total time (Yes in step S506), the test control apparatus 10 transmits It is determined that the timing is normal (step S507).

  When it is determined that the measured IFS does not satisfy the “default IFS” (No in step S502), it is determined that the measured back-off time does not satisfy the “default back-off time”. If (No in step S503), or if it is determined that the difference time S is less than the “predetermined IFS” or the difference time S is greater than the maximum value R of the total time (No in step S506), the test The control device 10 determines that it is not normal (step S508).

  As a modification, the order of step S502 and step S503 may be changed in the flow example shown in FIG.

  As described above, the test target apparatus (transmission timing test apparatus) 30 according to the present embodiment acquires the condition for calculating the transmission timing for transmitting a radio frame from the condition setting unit 52 and transmits the condition in the transmission timing calculation unit 53. Calculate timing. Then, based on the transmission timing acquired from the transmission timing calculation unit 53, the transmission unit 61 transmits a radio frame and measures the carrier sense start time and the transmission start time of the radio frame. Next, the information acquisition unit 54 acquires the transmission timing, the carrier sense start time, and the transmission start time from the transmission unit 61 and stores them in the storage unit 56 via the write processing unit 55. Then, the test control apparatus 10 can acquire the measurement result stored in the storage unit 56 from the test target apparatus (transmission timing test apparatus) 30 and determine whether the transmission timing is normal. That is, since the test target device (transmission timing test device) 30 can measure the transmission timing of the radio frame, it can provide information for testing the transmission timing of the radio frame.

  In the present embodiment, the information acquisition unit 54 has been described as receiving a condition for calculating the transmission timing from the transmission unit 61. However, the information acquisition unit 54 receives the condition for calculating the transmission timing and the transmission timing from the transmission timing calculation unit 53. The wireless frame type, carrier sense start time, and frame transmission start time may be received from the transmission unit 61.

  In this embodiment, transmission timing measurement in wireless communication has been described as an example. However, the technology described in this embodiment is not limited to wireless communication, and may be in the case of wired communication. That is, the technique described in the present embodiment can be applied to transmission timing measurement when a communication frame is transmitted regardless of wired or wireless.

  Further, step S502 and step S503 may be omitted in the flow example shown in FIG.

  Further, in the present embodiment, the test target device 30 has been described to have the function illustrated in FIG. 2, but the test device 20 may have the same function as the test target device 30.

In addition, this invention is not limited to above-described embodiment, Various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. In addition, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of the present embodiment.
Also, each of the above functions 51 to 55 may be realized by hardware by designing a part or all of them, for example, with an integrated circuit. Further, each of the above functions 51 to 55 may be realized by software by interpreting and executing a program in which a processor such as a microcomputer realizes each function. Information such as programs, tables, and files for realizing the functions 51 to 55 is stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), an IC (Integrated Circuit) card, an SD card, a DVD (Digital Versatile Disc). ) Or the like.
In addition, the control lines and information lines are those that are considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. In practice, it may be considered that almost all configurations are connected to each other.

10 Test Control Device 20 Test Device 30 Test Target Device (Transmission Timing Test Device)
31, 32, 33 Transmission timing information group 40 Antenna 51 Measurement test control unit 52 Condition setting unit 53 Transmission timing calculation unit 54 Information acquisition unit 55 Write processing unit 56 Storage unit 61 Transmission unit 62 Reception unit 70 Time chart 100 Wireless communication test system

Claims (5)

A condition for calculating a transmission timing for transmitting a communication frame is acquired, and a transmission timing calculation unit that calculates the transmission timing;
Based on the transmission timing acquired from the transmission timing calculation unit, while transmitting the communication frame, a transmission unit for measuring the carrier sense start time and the transmission start time of the communication frame,
An information acquisition unit for acquiring the transmission timing, the carrier sense start time and the transmission start time from the transmission unit;
A transmission timing test apparatus comprising: A condition for calculating a transmission timing for transmitting a communication frame is acquired, and a transmission timing calculation unit that calculates the transmission timing;
Based on the transmission timing acquired from the transmission timing calculation unit, while transmitting the communication frame, a transmission unit for measuring the carrier sense start time and the transmission start time of the communication frame,
An information acquisition unit that acquires the transmission timing calculation condition and the transmission timing from the transmission timing calculation unit, and acquires the type of the communication frame, the carrier sense start time, and the transmission start time from the transmission unit;
A transmission timing test apparatus comprising: Transmission timing test equipment
A transmission timing calculation step for obtaining a condition for calculating a transmission timing for transmitting a communication frame and calculating the transmission timing;
A transmission step of transmitting the communication frame based on the transmission timing acquired from the transmission timing calculation step, and measuring a carrier sense start time and a transmission start time of the communication frame;
An information acquisition step of acquiring the transmission timing, the carrier sense start time and the transmission start time from the transmission step;
The transmission timing test method characterized by performing. Transmission timing test equipment
A transmission timing calculation step for obtaining a condition for calculating a transmission timing for transmitting a communication frame and calculating the transmission timing;
A transmission step of transmitting the communication frame based on the transmission timing acquired from the transmission timing calculation step, and measuring a carrier sense start time and a transmission start time of the communication frame;
An information acquisition step of acquiring a condition for calculating the transmission timing and the transmission timing from the transmission timing calculation step, and acquiring a type of the communication frame, the carrier sense start time, and the transmission start time from the transmission step;
The transmission timing test method characterized by performing.   A program for causing the transmission timing test apparatus to execute the transmission timing test method according to claim 3 or 4.

Images