JP5966040B1 - Communication apparatus and calculation method - Google Patents

Abstract

An object of the present invention is to accurately measure the throughput of a wireless section. A communication apparatus includes a transmission control unit that transmits a request packet to another communication apparatus that is wirelessly connected to an access point, and receives a response packet for the request packet from the other communication apparatus. The reception control unit 132 corrects the time from when the request packet is transmitted to when the response packet is received according to the connection state between itself and the access point 2 and the connection state between the other communication device 3 and the access point 2. And a calculation unit 133 that calculates the throughput of the wireless section based on the first round trip delay time. [Selection] Figure 1

Description

  The present invention relates to a communication apparatus and a calculation method for measuring throughput with a wireless LAN access point that is a relay apparatus for wireless communication.

  With the spread of wireless technology, a wireless LAN environment has also been constructed in general user homes. Throughput measurement is widely used as a method for grasping the communication status of a wireless LAN environment built in a home. For example, in Patent Document 1, the throughput of a wireless LAN environment is measured using a probe signal of the wireless LAN. A measuring device has been proposed.

  With the diversification of communication devices, not only personal computers (PCs) but also portable communication devices such as smartphones, mobile phones, tablet PCs, and game machines are widely used in home wireless LAN environments. Here, in a portable communication device such as a smartphone, there are many communication devices that do not include an API that transmits a probe signal, and a method of measuring throughput using a probe signal as in Patent Literature 1 is depending on the communication device. There was a problem that it could not be realized.

  In this regard, the present inventors have invented a mechanism for measuring throughput without using a probe signal by performing communication at the IP layer, specifically, ICMP (Internet Control Message Protocol) ping. It has already been proposed in No. 2015-013050.

Japanese Patent No. 4675743

By the way, IEEE 802.11n, which is a wireless LAN standard, defines a function called frame aggregation that transmits a large amount of data in one frame transmission by connecting a large number of transmission data. In order to operate the frame aggregation function, it is necessary for a plurality of frames to be in a transmission waiting state.For example, when transmitting a packet of a certain size or more, the packet is divided into a plurality of frames, It is sent in a batch by the aggregation function.
Therefore, in the throughput measurement using ping, ICMP packets (Echo Request, Echo Reply) of a certain size or larger are used so that the frame aggregation function operates in order to measure the throughput that matches the user's wireless usage state. Must send and receive.

FIG. 8A shows the relationship between the ping packet size, the round-trip delay time (RTT) and the throughput calculated from the round-trip delay time. In FIG. 8 (and FIG. 4 described later), the respective relationships are simplified and schematically shown.
As shown in FIG. 8A, when the packet size is less than 10,000 bytes, a lower throughput is calculated as compared with the actual wireless use. This is because in frame aggregation, the efficiency increases as the packet size increases, and the ICMP processing time dominates the communication time as the packet size decreases. On the other hand, it can be seen that the calculation result is stable when the packet size exceeds 20000 or 30000 bytes, and the throughput that matches the actual situation is calculated.

As described above, one method for measuring accurate throughput using ping is to increase the packet size. However, simply increasing the packet size causes the following problems.
A problem that occurs when the packet size is increased will be described with reference to FIG. In FIG. 8B, a specific model case is used for easy understanding. However, the problem described below is not limited to such a case.

There is known a video distribution service for distributing video content to a communication device owned by a user so that video content such as TV broadcasting can be viewed at a favorite place in the house. In such a video distribution service, as shown in FIG. 8B, a video distribution device is installed in the home, and the communication device and the video distribution device communicate with each other via a wireless LAN access point, so that Distribution is performed.
When introducing a video distribution service, it is first necessary to confirm whether sufficient throughput can be secured at the user's home. In the measurement of throughput, although it is originally necessary to measure the throughput between the communication device and the video distribution device, since the video distribution device is not installed at the user's home before the service introduction, the communication device-access point Will measure the throughput.

  Here, as described above, in the throughput measurement using ping, it is necessary to increase the packet size. However, if the packet size is increased, packet fragmentation and defragmentation occur. In this regard, devices at the end of communication, such as communication devices and video distribution devices, are assumed to perform packet fragmentation (and defragmentation, hereinafter omitted), while relaying communication like an access point It is not assumed that a device that performs packet fragmentation or the like will perform. For this reason, the round trip delay time of the ping between the communication device and the access point tends to be longer than the round trip delay time between the communication device and the video distribution device by the extra time required for the fragment of the access point. As a result, the measured throughput tends to be calculated lower than the actual throughput.

In the case of the video distribution service illustrated in FIG. 8B, the introduction of the service or the image quality (high image quality / low image quality) of the video to be distributed may be advised based on the measured throughput. Therefore, if the measured throughput is lower than the actual throughput, it will lead to miss the opportunity of introducing the service for the operator side, and if the user side sees it, it is possible to view the image with high image quality. Nevertheless, viewing with low image quality may be recommended.
In this way, when measuring the throughput between the access points using the ping (wireless section), accurate measurement cannot be performed unless the data size is increased due to the relationship with the frame aggregation. When the data size is increased, there is a problem that accurate measurement cannot be performed.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a communication apparatus and a calculation method capable of accurately measuring the throughput of a wireless section.

  In the first aspect of the present invention, a communication device wirelessly connected to a parent device that transmits radio waves, wherein the transmission control unit transmits a packet to another communication device wirelessly connected to the parent device; , A reception control unit that receives a response packet for the packet from the other communication device, a time period from when the packet is transmitted until the response packet is received, a connection state between itself and the base unit, and Provided is a communication device comprising: a calculation unit that calculates a throughput between the communication device and the parent device based on a first round-trip delay time corrected according to a connection state between another communication device and the parent device To do.

  The transmission control unit transmits the packet to the parent device in a first environment that is the same environment as the environment in which the first round trip delay time is acquired and in a second environment different from the first environment. The calculation unit obtains, as a second round-trip delay time, a time until a response packet for the packet is received from the parent device in the first environment, and receives the response packet for the packet in the second environment. An acquisition unit that acquires a time until reception from the parent device as a third round-trip delay time, and a first that calculates a difference between the first round-trip delay time and the second round-trip delay time in the first environment as a difference time A calculation unit; a second calculation unit that calculates a fourth round trip delay time by correcting the third round trip delay time in the second environment based on the difference time; Based on the fourth round trip time it may be provided with a third calculation unit for calculating a throughput between the communication device and the base unit.

  The first calculation unit calculates the difference time in the first environment for each type of the parent device, and the second calculation unit determines the type of the parent device for which the third round trip delay time is calculated. The fourth round trip delay time may be calculated based on the corresponding difference time.

  Further, the calculation unit may calculate a half of the time from when the packet is transmitted to when the response packet is received as the first round trip delay time.

  The transmission control unit may transmit a packet larger than a predetermined size to the other communication device.

  According to a second aspect of the present invention, there is provided a calculation method for calculating a throughput between a base unit that transmits radio waves and a base unit that is wirelessly connected to the base unit, wherein packets are wirelessly connected to the base unit. A step of transmitting to the other communication device, a step of receiving a response packet to the packet from the other communication device, and a time from when the packet is transmitted until the response packet is received. The throughput between the communication device and the parent device is calculated based on the first round-trip delay time corrected according to the connection state between the communication device and the parent device and the connection state between the other communication device and the parent device. And a calculation method including the steps.

  According to the present invention, it is possible to accurately measure the throughput of a radio section.

It is a figure which shows the outline | summary of the communication apparatus of 1st Embodiment. It is a block diagram which shows the function structure of the communication apparatus of 1st Embodiment. It is a sequence diagram which shows the flow of a process of the communication apparatus of 1st Embodiment. It is a figure which shows an example of the measurement result of a throughput. It is a figure which shows the outline | summary of the communication apparatus of 2nd Embodiment. It is a block diagram which shows the function structure of the communication apparatus of 2nd Embodiment. It is a sequence diagram which shows the flow of a process of the communication apparatus of 2nd Embodiment. It is a figure explaining the problem of the throughput measurement using ping.

[Outline of First Embodiment]
First, the outline of the first embodiment of the communication device 1 that accurately calculates the throughput of the wireless section will be described with reference to FIG.
As shown in FIG. 1, in the first embodiment, the throughput in the wireless section (between the communication device 1 and the access point 2) is measured using the communication device 1, the access point 2, and another communication device 3. The access point 2 is a wireless LAN access point (master), and constructs a wireless LAN environment by transmitting radio waves to the surroundings. The communication devices 1 and 3 are arbitrary terminal devices, and in this embodiment, portable communication devices such as a smartphone, a mobile phone, a tablet PC, and a game machine are used. The communication devices 1 and 3 are connected to each other via the access point 2.

  As described above, in throughput measurement using ping, the data size has to be increased due to the relationship with frame gregation. On the other hand, increasing the data size requires packet fragmentation and defragmentation. In addition, in a device that relays communication such as the access point 2, it takes time to process a packet fragment or the like. Therefore, when throughput measurement using ping is performed between the communication device 1 and the access point 2, an actual measurement is performed. A throughput different from that during communication is measured.

  Therefore, the communication device 1 according to the first embodiment does not transmit a ping to the access point 2 but transmits a ping to another communication device 3 that is wirelessly connected to the access point 2 to thereby establish a wireless section. Measure the throughput.

The other communication device 3 is a device at the end of communication, and the time required for processing such as a fragment is substantially the same as the processing time of the communication device 1 during actual communication. Further, since the access point 2 simply relays the ping, the access point 2 does not need to process a fragment or the like, and unnecessary delay does not occur.
On the other hand, since the other communication device 3 is wirelessly connected to the access point 2, there are more wireless sections between the communication device 1 and the other communication device 3 than between the communication device 1 and the access point 2. .

  Therefore, in the communication device 1 of the first embodiment, the round-trip delay time of the ping between the communication device 1 and the other communication device 3 is corrected to calculate the throughput of the wireless section. Details of the correction will be described later, but most simply, the communication device 1 uses a half of the round-trip delay time of the ping between the communication device 1 and the other communication device 3 as the round-trip delay time of the wireless section. Calculate the throughput.

As described above, in the communication device 1 according to the first embodiment, the ping round-trip delay time is acquired with the other communication device 3 via the access point 2, and the throughput is calculated by correcting the round-trip delay time. As a result, the throughput of the wireless section can be calculated accurately.
When such a throughput calculation method is applied at the time of introducing the above-described video distribution service, the service provider visits the user's home with two communication devices 1 and 3 in the kitchen, and an access point installed in the user's home By performing a ping response between the two communication devices 1 and 3 via 2, the throughput of the wireless section in the user's home can be accurately calculated.

[Configuration of Communication Device 1]
Then, the structure of the communication apparatus 1 of 1st Embodiment is demonstrated. FIG. 2 is a block diagram illustrating a functional configuration of the communication device 1 according to the first embodiment.
As shown in FIG. 2, the communication device 1 includes a communication unit 11, a storage unit 12, and a control unit 13.

The communication unit 11 includes a transmission antenna and a reception antenna. The communication unit 11 modulates the signal output from the control unit 13 to generate an RF (Radio Frequency) signal, and the external device such as the access point 2 via the transmission antenna. Is transmitted wirelessly. In addition, the communication unit 11 demodulates the RF signal received via the reception antenna and outputs the demodulated signal to the control unit 13.
The storage unit 12 is a memory such as a ROM and a RAM, or a storage medium such as a hard disk. The storage unit 12 stores a program for causing the control unit 13 to function and data generated when the control unit 13 operates.

  The control unit 13 is configured by a CPU, for example, and functions as a transmission control unit 131, a reception control unit 132, and a calculation unit 133 by executing various programs stored in the storage unit 12.

The transmission control unit 131 transmits an ICMP request packet (Echo Request) larger than a predetermined size to the other communication device 3 wirelessly connected to the access point 2 via the access point 2. The predetermined size is at least a size at which frame aggregation operates, and is preferably a size exceeding 20000 or 30000 bytes in order to calculate an accurate throughput.
The reception control unit 132 receives a response packet (Echo Reply) to the request packet from another communication device via the access point 2.

  The calculation unit 133 acquires the time from when the request packet is transmitted until the response packet is received. In addition, the calculation unit 133 corrects the time according to the connection state between the communication device 1 and the access point 2 and the connection state between the other communication device 3 and the access point 2 to obtain a first round-trip delay time (first time) 1 RTT) is calculated.

As the connection state, for example, the link speed between each of the communication devices 1 and 3 and the access point 2 and the received radio wave intensity (RSSI) in the communication devices 1 and 3 can be used. Use link speed. When correcting the ping response time based on the link speed, the calculation unit 133 corrects the response time based on the following equation.
First RTT = (Link_Speed_2) / (Link_Speed_1 + Link_Speed_2) × ping response time In the equation, Link_Speed_1 is the link speed between the communication device 1 and the access point 2, and Link_Speed_2 is the other communication device 3 and the access point 2 Link speed between

According to this equation, when the communication devices 1 and 3 have the same connection state with the access point 2 (the link speed is the same), the first round-trip delay time is one half of the ping response time.
For example, when a video distribution service is introduced, a service provider who visits a user's home acquires a ping response time in a state where both the communication devices 1 and 3 are possessed. If one service provider has both communication devices 1 and 3, the communication devices 1 and 3 are close to each other, and the connection state with the access point 2 is approximate. By doing this, the first round trip delay time can be easily obtained.

The calculation unit 133 calculates the throughput between the communication device 1 and the access point 2 (wireless section) based on the first round trip delay time obtained as a result of the correction. Specifically, the calculation unit 133 calculates the throughput of the wireless section based on the following formula.
Throughput [Mbps] = packet size [Byte] × 8 × 2 / first RTT [msec] / 1000

[Processing of Communication Device 1]
The configuration of the communication device 1 according to the present embodiment has been described above. Next, a processing flow when the communication device 1 calculates the throughput of the wireless section will be described. FIG. 3 is a sequence diagram illustrating a processing flow of the communication device 1.

  First, in step S1, the communication device 1 accepts a measurement start operation. Upon receiving this operation, the communication device 1 transmits a request packet (Echo Request) to the other communication device 3 via the access point 2. When the other communication device 3 receives the request packet, it returns a response packet (Echo Reply) to the communication device 1 via the access point 2. When the communication device 1 receives the response packet, the communication device 1 acquires the ping response time.

When the ping response is repeated a predetermined number of times, the communication device 1 acquires the first round trip delay time (first RTT) in step S2. Specifically, the communication device 1 acquires the first round-trip delay time by correcting an arbitrary value such as an average value or a median value of ping response times for a predetermined number of times based on the connection state. Further, the communication device 1 calculates the throughput from the acquired first round trip delay time.
When the throughput is calculated in this way, in step S3, the communication device 1 outputs the calculated throughput in a predetermined manner, and ends the process.

[Example of measurement results]
The communication device 1 according to the first embodiment has been described above. Next, FIG. 4 shows an example of a measurement result of throughput actually performed by the present inventors. The present inventors, for each of the access point 2, another communication device 3 wirelessly connected to the access point 2, and the video distribution device (see FIG. 8B) connected to the access point 2 by wire, A request packet was transmitted from the communication device 1, and the round trip time and throughput were calculated.

In FIG. 4A, the round trip delay time 101 is a response time of ping between the communication device 1 and the other communication device 3, and the round trip delay time 101 A is between the communication device 1 and the other communication device 3. The response time of the ping is half the time. The round trip delay time 102 is a ping response time between the communication device 1 and the access point 2, and the round trip delay time 103 is a ping response time between the communication device 1 and the video distribution device.
In addition, the throughputs calculated based on the round trip delay times 101A, 102, and 103 are shown as throughputs 111A, 112, and 113 in FIG. 4B, respectively.

  As shown in FIG. 4A, when the round trip delay times 102 and 103 are compared, when a request packet having a predetermined size or more is transmitted to the access point 2, it takes time to process a fragment or the like. The response time is delayed as compared with the case where a request packet is transmitted. As a result, as shown in FIG. 4B, the throughput 112 calculated between the communication device 1 and the access point 2 is slower than the throughput 113 calculated between the communication device 1 and the video distribution device. Become.

  Further, as shown in round trip delay times 101 and 103 in FIG. 4A, when another communication device 3 wirelessly connected to the access point 2 is used as a communication partner, the wireless section increases, so the video distribution device is The response time is delayed and the throughput is slower than in the case where the communication partner is used (not shown).

On the other hand, as shown in the round trip delay times 101A and 103, it was confirmed that the round trip delay time 101A when the round trip delay time 101 was corrected as in the above-described embodiment substantially coincided with the round trip delay time 103.
As a result, as shown in FIG. 4B, the throughputs 111A and 113 calculated based on the round-trip delay times 101A and 103 also substantially match, and the wireless device throughput is accurately measured by the communication device 1 of the present embodiment. I was able to confirm that

[Effect of the first embodiment]
According to the communication device 1 of the first embodiment described above, the communication device 1 accesses the communication devices 1 and 3 with the ping response time between the access point 2 and another communication device 3 wirelessly connected. By correcting according to the connection state with the point 2, the throughput in the wireless section (between the communication apparatus 1 and the access point 2) is measured.
As a result, the throughput can be measured using a packet having a size sufficient for frame aggregation to operate, so that the throughput in the wireless section can be accurately calculated.

[Outline of Second Embodiment]
Next, a second embodiment of the communication device 1 will be described. In the first embodiment, an accurate throughput is calculated by correcting a ping response time between the two communication apparatuses 1 and 3. In such a method of the first embodiment, a service provider who visits a user's home must bring two communication devices 1 and 3, but in the second embodiment, two communication devices 1 and 3 We are going to further eliminate the annoyance associated with bringing

First, the outline of the second embodiment will be described with reference to FIG.
The reason why the other communication device 3 is used for calculating the throughput of the wireless section is to remove the influence of the extra time required for the fragment of the access point 2 and the like, as already described. In the second embodiment, first, before the user visits the user's home, the extra time is calculated in the first wireless environment such as the service provider's in-house equipment. By correcting the response time of the ping between and with the calculated time, the throughput of the wireless section is calculated with only one communication device 1.

Specifically, as shown in FIG. 5A, in the same first wireless environment, the first round trip delay time is acquired between the communication device 1 and another communication device 3 as in the first embodiment. At the same time, a second round trip delay time is acquired between the communication device 1 and the access point 2, and a difference time between the first round trip delay time and the second round trip delay time is calculated.
Subsequently, as shown in FIG. 5B, in a second wireless environment such as a user's home where the wireless environment is different, a third round-trip delay time is calculated between the communication device 1 and the access point 2, and the first wireless Correction is performed based on the difference time calculated in the environment.

Here, since the difference time is calculated from the first round trip delay time and the second round trip delay time acquired in the same wireless environment, the access point 2 is more expensive than the communication device 1 etc. The processing time, in other words, the time unique to the access point 2 caused by the hardware of the access point 2 is shown regardless of the wireless environment.
Therefore, by correcting the third round trip delay time between the communication device 1 and the access point 2 based on the differential time unique to the access point 2, the ping of the wireless section can be performed without using another communication device 3. The response time can be calculated accurately.

  In the following description, the communication device 1 acquires the first round-trip delay time by correcting the response time of the ping between the communication devices 1 and 3. In this regard, since there is a video distribution device connected to the access point 2 by wire in the first wireless environment such as in-house equipment of the service provider, the communication device 1 is connected between the communication device 1 and the video distribution device. The ping response time itself may be acquired as the first round trip delay time.

[Configuration of Communication Device 1 of Second Embodiment]
FIG. 6 is a block diagram illustrating a functional configuration of the communication device 1 according to the second embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As illustrated in FIG. 6, in the communication device 1 according to the second embodiment, the calculation unit 133 further includes an acquisition unit 134, a first calculation unit 135, a second calculation unit 136, and a third calculation unit 137. .

The acquisition unit 134 performs the ping response between the communication device 1 and the other communication device 3 and between the communication device 1 and the access point 2 in the first wireless environment, whereby the first round-trip delay described above. Obtain time and second round trip delay time. Here, the acquired first round-trip delay time and second round-trip delay time are used to calculate the difference time. Since the difference time is a time unique to the access point 2, the acquisition unit 134 uses the access point 2. It is preferable to calculate the second round trip delay time in the first wireless environment for each type (model number, etc.).
In addition, the acquisition unit 134 acquires the above-described third round trip delay time by performing a ping response between the communication device 1 and the access point 2 in the second wireless environment.

  The first calculation unit 135 calculates the difference between the first round trip delay time and the second round trip delay time acquired in the same first wireless environment as the difference time. When the second round trip delay time is acquired for each type of access point 2, the first calculation unit 135 calculates a difference time for each type.

  The second calculation unit 136 corrects the third round-trip delay time in the second wireless environment based on the difference time calculated by the first calculation unit 135 (third round-trip delay time−difference time), whereby the access point 2 The fourth round trip delay time is calculated by removing the processing time for the extra fragments. In order to remove the processing time unique to the access point 2, the second calculation unit 136 calculates in advance the access point 2 of the same type as the access point 2 that calculated the third round trip delay time. It is preferable to correct based on the set differential time and calculate the fourth round trip delay time.

  The third calculator 137 calculates the throughput between the communication device 1 and the access point 2 (wireless section) based on the fourth round trip delay time calculated by the second calculator 136. Note that the throughput calculation method is the same as in the first embodiment.

[Processing of Communication Device 1 of Second Embodiment]
The configuration of the communication device 1 according to the second embodiment has been described above. Next, a flow of processing when the communication device 1 according to the second embodiment calculates the throughput of the wireless section will be described. FIG. 7 is a sequence diagram illustrating a processing flow of the communication device 1 according to the second embodiment.

First, in step S11, the communication device 1 accepts a measurement start operation in the first wireless environment. Upon receiving this operation, the communication device 1 transmits a request packet (Echo Request) to the other communication device 3 via the access point 2. When the other communication device 3 receives the request packet, it returns a response packet (Echo Reply) to the communication device 1 via the access point 2. When the communication device 1 receives the response packet, the communication device 1 acquires the ping response time.
When the ping response is repeated a predetermined number of times with another communication device 3, the communication device 1 corrects the response time (average value, etc.) for the predetermined number of times based on the connection state (for example, a half) in step S12. ) To obtain the first round trip delay time (first RTT).

Subsequently, the communication device 1 transmits a request packet (Echo Request) to the access point 2. When the access point 2 receives the request packet, it returns a response packet (Echo Reply) to the communication device 1. When the communication device 1 receives the response packet, the communication device 1 acquires the ping response time.
When the ping response with the access point 2 is repeated a predetermined number of times, the communication device 1 acquires the second round trip delay time (second RTT) from the response time (average value or the like) for the predetermined number of times in step S13.

  Subsequently, in step S14, the communication device 1 calculates a difference between the first round trip delay time acquired in step S12 and the second round trip delay time acquired in step S13, and holds the difference time.

Thereafter, when moving to the second wireless environment, in step S21, the communication device 1 accepts a measurement start operation. Upon receiving this operation, the communication device 1 transmits a request packet (Echo Request) to the access point 2 that constructs the second wireless environment. When the access point 2 receives the request packet, it returns a response packet (Echo Reply) to the communication device 1. When the communication device 1 receives the response packet, the communication device 1 acquires the ping response time.
When the ping response is repeated a predetermined number of times with the access point 2 in the second wireless environment, the communication device 1 determines from the response time (average value, etc.) for the predetermined number of times to the third round trip delay time (first 3RTT).

  Subsequently, in step S23, the communication device 1 calculates the fourth round trip delay time (fourth RTT) by correcting the third round trip delay time acquired in step S22 with the difference time calculated in step S14. In step S24, the communication apparatus 1 calculates the throughput from the calculated fourth round trip delay time. In step S25, the communication apparatus 1 outputs the calculated throughput in a predetermined manner, and ends the process.

[Effects of Second Embodiment]
According to the communication device 1 of the second embodiment described above, an extra time (difference time) required for processing of the fragment of the access point 2 is calculated in advance and held in the communication device 1. Then, when actually measuring the throughput of the radio section, the round trip delay time acquired between the communication device 1 and the access point 2 is corrected based on the difference time, thereby eliminating the extra time specific to the access point 2 To do.
Thereby, the throughput of the wireless section can be accurately calculated by only one communication device 1.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. In particular, the specific embodiments of the distribution / integration of the devices are not limited to those illustrated above, and all or a part thereof may be added in arbitrary units according to various additions or according to functional loads. It can be configured functionally or physically distributed and integrated.

DESCRIPTION OF SYMBOLS 1 ... Communication apparatus 11 ... Communication part 12 ... Memory | storage part 13 ... Control part 131 ... Transmission control part 132 ... Reception control part 133 ... Calculation part 2 ... Access point 3. Other communication devices

Claims (6)

A communication device that is wirelessly connected to a parent device that emits radio waves,
A transmission control unit for transmitting a packet to another communication device wirelessly connected to the master unit;
A reception control unit that receives a response packet to the packet from the other communication device;
A first round trip delay time obtained by correcting the time from when the packet is transmitted until the response packet is received according to the connection state between itself and the parent device and the connection state between the other communication device and the parent device. Based on the calculation unit for calculating the throughput between the communication device and the base unit,
A communication device comprising: The transmission control unit transmits the packet to the parent device in a first environment that is the same environment as the environment in which the first round-trip delay time is acquired and a second environment different from the first environment,
The calculation unit includes:
The time until the response packet for the packet is received from the parent device in the first environment is acquired as the second round trip delay time, and the response packet for the packet is received from the parent device in the second environment. An acquisition unit for acquiring time as a third round trip delay time;
A first calculation unit that calculates a difference between the first round trip delay time and the second round trip delay time in the first environment as a difference time;
A second calculation unit that calculates a fourth round trip delay time by correcting the third round trip delay time in the second environment based on the difference time;
A third calculation unit that calculates a throughput between the communication device and the parent device based on the calculated fourth round-trip delay time;
The communication apparatus according to claim 1. The first calculation unit calculates the difference time in the first environment for each type of the parent device,
The second calculation unit calculates the fourth round-trip delay time based on the difference time according to the type of the parent device that calculated the third round-trip delay time.
The communication apparatus according to claim 2. The calculation unit calculates a half of the time from when the packet is transmitted to when the response packet is received as the first round trip delay time.
The communication apparatus according to any one of claims 1 to 3. The transmission control unit transmits a packet larger than a predetermined size to the other communication device;
The communication apparatus according to any one of claims 1 to 4. A calculation method for calculating a throughput between the parent device in a communication device wirelessly connected to the parent device that transmits radio waves,
Transmitting a packet to another communication device wirelessly connected to the base unit;
Receiving a response packet to the packet from the other communication device;
A first round trip delay time obtained by correcting the time from when the packet is transmitted until the response packet is received according to the connection state between itself and the parent device and the connection state between the other communication device and the parent device. Based on the step of calculating the throughput between the communication device and the base unit,
Calculation method including

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