WO2018163678A1

WO2018163678A1 - Communications system

Info

Publication number: WO2018163678A1
Application number: PCT/JP2018/003609
Authority: WO
Inventors: 充志有留
Original assignee: 日本電気株式会社
Priority date: 2017-03-10
Filing date: 2018-02-02
Publication date: 2018-09-13

Abstract

A communication device (100) generates, for each of a plurality of frequencies, a measurement frame including transmission timing information therein that indicates timing with which a prescribed measurement frame is transmitted, and transmits the generated measurement frame with the timing indicated by the transmission timing information included in the measurement frame, and a communication device (200) measures, for each of the plurality of frequencies, the reception timing with which the transmitted measurement frame is received, calculates for each of the plurality of frequencies a delay time of the measurement frame on the basis of the transmission timing indicated by the transmission timing information included in the received measurement frame and the measured reception timing, and equilibrates the calculated delay time over a span of the plurality of frequencies.

Description

Communications system

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

In a communication system in which communication devices are opposed to each other via a wireless transmission path, a filter is provided in the wireless signal transmitting unit and the wireless signal receiving unit. This filter is provided on the radio signal transmission side in order to prevent unnecessary frequency components generated from circuits in the apparatus from being released into the space. Further, this filter is provided on the radio signal receiving side in order to remove unnecessary frequency components from a signal input from space and to extract a desired frequency. Also, in a system that synthesizes and transmits multiple frequency channels and separates them for each frequency channel in order to transfer a large-capacity radio signal, it is closer to the frequency band used for transmission and reception. A band-pass filter having a steep attenuation near the edge of the pass band may be used.
As a characteristic of this bandpass filter, there is a characteristic that the delay of the radio signal becomes steep near the edge where the attenuation amount is steep, and a large delay difference occurs in the entire passband.

This kind of delay difference has never been a big problem. However, today, as the modulation method becomes multi-valued such as 2048QAM, the problem has become more prominent, such as a delay difference causing signal deterioration or in the worst case causing signal interruption.

Also, this is a technique for measuring the delay time for each frequency band, and performs delay compensation processing according to the frequency, such as detecting the delay time using the result of comparison between the mark frequency of the target frequency and the space frequency. Technology has been considered (see, for example, Patent Documents 1 and 2).

JP 05-191382 A Japanese Patent No. 04-369134

In the above-described technique, a countermeasure for equalizing the delay can be considered by applying an inverse characteristic using a delay equalizer arranged in the reception unit of the radio signal. However, the degree of delay varies according to the individual characteristics of the filter being used, and the degree of inverse characteristics cannot be determined universally. Therefore, it is necessary to measure in advance the delay characteristics of the individual wireless transmission device systems that are configured. In addition, a measure to stop the equalization of the delay characteristics itself by widening the passband of the bandpass filter relative to the frequency band of the signal to be transmitted and received so that the transmitted and received signal is not applied near the edge where the delay becomes steep is considered. It is done. However, in a system that synthesizes a plurality of frequency channels, it is necessary to increase the interval between adjacent channels, and the frequency band cannot be effectively used.
As described above, the above-described technique has a problem in that it is not possible to easily obtain delay characteristics of individual transmission systems using a plurality of frequencies.

An object of the present invention is to provide a communication system, a communication device, a communication method, and a program that can solve any of the problems described above.

The communication system of the present invention includes:
A first communication device and a second communication device;
The first communication device is:
For each of a plurality of frequencies, a measurement frame generator for generating the measurement frame by including transmission timing information indicating the timing of transmitting a predetermined measurement frame in the measurement frame;
A frame transmission unit that transmits the measurement frame generated by the measurement frame generation unit at a timing indicated by transmission timing information included in the measurement frame;
The second communication device is:
A reception timing measuring unit that measures the reception timing at which the measurement frame transmitted from the frame transmission unit is received for each of the plurality of frequencies; and
Delay time for calculating the delay time of the measurement frame for each of the plurality of frequencies based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit A calculation unit;
A delay equalization unit that balances the delay time calculated by the delay time calculation unit over the plurality of frequencies.
The communication device of the present invention
For each of a plurality of frequencies, a measurement frame generator for generating the measurement frame by including transmission timing information indicating the timing of transmitting a predetermined measurement frame in the measurement frame;
A frame transmission unit configured to transmit the measurement frame generated by the measurement frame generation unit at a timing indicated by transmission timing information included in the measurement frame.
In addition, a reception timing measurement unit that measures the reception timing at which the measurement frames transmitted for each of the plurality of frequencies are received for each of the plurality of frequencies, and
Delay time for calculating the delay time of the measurement frame for each of the plurality of frequencies based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit A calculation unit;
A delay equalization unit that balances the delay time calculated by the delay time calculation unit over the plurality of frequencies.
Further, the communication method of the present invention includes:
For each of a plurality of frequencies, transmission timing information indicating the timing of transmitting a predetermined measurement frame is included in the measurement frame to generate the measurement frame,
Transmitting the generated measurement frame at a timing indicated by transmission timing information included in the measurement frame;
The reception timing at which the transmitted measurement frame is received is measured for each of the plurality of frequencies,
Based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the measured reception timing, the delay time of the measurement frame is calculated for each of the plurality of frequencies,
The calculated delay time is balanced over the plurality of frequencies.
Further, a recording medium on which the program of the present invention is recorded,
A recording medium that records a program to be executed by a computer,
For each of a plurality of frequencies, a procedure for generating the measurement frame by including transmission timing information indicating a timing for transmitting a predetermined measurement frame in the measurement frame;
A program for executing the procedure of transmitting the generated measurement frame at the timing indicated by the transmission timing information included in the measurement frame is recorded.
Also, a recording medium that records a program to be executed by a computer,
A procedure for measuring the reception timing at which a measurement frame transmitted for each of a plurality of frequencies is received for each of the plurality of frequencies,
A procedure for calculating a delay time of the measurement frame for each of the plurality of frequencies based on a transmission timing indicated by transmission timing information included in the received measurement frame and the measured reception timing;
A program for executing the procedure of balancing the calculated delay time over the plurality of frequencies is recorded.

As described above, in the present invention, it is possible to easily obtain the delay characteristics of each transmission system using a plurality of frequencies.

It is a figure which shows 1st Embodiment of the communication system of this invention. It is a figure which shows an example of an internal structure of the communication apparatus of the frame transmission side shown in FIG. It is a figure which shows an example of an internal structure of the communication apparatus of the frame reception side shown in FIG. 2 is a flowchart for explaining processing performed by the frame transmission-side communication apparatus shown in FIG. 1 in the communication method in the communication system shown in FIG. 1. 2 is a flowchart for explaining processing performed by the communication device on the frame reception side shown in FIG. 1 in the communication method in the communication system shown in FIG. 1. It is a figure which shows 2nd Embodiment of the communication system of this invention. It is a figure which shows an example of an internal structure of the radio | wireless transmission apparatus by the side of a frame transmission shown in FIG. It is a figure which shows an example of an internal structure of the radio | wireless transmission apparatus by the side of a frame shown in FIG. 7 is a flowchart for explaining processing performed by the radio transmission apparatus on the frame transmission side shown in FIG. 6 in the communication method in the communication system shown in FIG. 6. It is a figure which shows an example of the flow of a measurement frame. 7 is a flowchart for explaining processing performed by the wireless transmission device on the frame reception side shown in FIG. 6 in the communication method in the communication system shown in FIG. 6.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)

FIG. 1 is a diagram showing a first embodiment of a communication system of the present invention. As shown in FIG. 1, the communication system of the present invention includes a communication device 100 and a communication device 200. The communication device 100 and the communication device 200 are connected to each other and can transmit and receive signals.

FIG. 2 is a diagram illustrating an example of an internal configuration of the communication apparatus 100 illustrated in FIG. The communication apparatus 100 shown in FIG. 1 is a first communication apparatus having a measurement frame generation unit 110 and a frame transmission unit 120 as shown in FIG. FIG. 2 shows an example of main components related to the present embodiment among the components included in the communication apparatus 100 shown in FIG.

The measurement frame generation unit 110 generates a predetermined measurement frame. At this time, the measurement frame generation unit 110 generates a measurement frame by including transmission timing information indicating the timing of transmitting the measurement frame for each of a plurality of frequencies in the measurement frame.
The frame transmission unit 120 transmits the measurement frame generated by the measurement frame generation unit 110 to the communication apparatus 200 at the timing indicated by the transmission timing information included in the measurement frame.

FIG. 3 is a diagram illustrating an example of an internal configuration of the communication apparatus 200 illustrated in FIG. The communication apparatus 200 shown in FIG. 1 is a second communication apparatus having a reception timing measurement unit 210, a delay time calculation unit 220, and a delay equalization unit 230 as shown in FIG. Note that FIG. 3 illustrates an example of main components related to the present embodiment among the components included in the communication device 200 illustrated in FIG. 1.

The reception timing measurement unit 210 measures the reception timing at which the measurement frame transmitted from the frame transmission unit 120 of the communication apparatus 100 is received for each of a plurality of frequencies.
The delay time calculation unit 220 calculates the delay time of the measurement frame for each of a plurality of frequencies based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit 210. calculate.
The delay equalization unit 230 balances the delay time calculated by the delay time calculation unit 220 over a plurality of frequencies.

Hereinafter, a communication method in the communication system shown in FIG. 1 will be described. First, processing performed by the communication apparatus 100 shown in FIG. 1 in the communication method in the communication system shown in FIG. 1 will be described. FIG. 4 is a flowchart for explaining processing performed by communication apparatus 100 shown in FIG. 1 in the communication method in the communication system shown in FIG.

First, in step 1, the measurement frame generation unit 110 generates a predetermined measurement frame. At this time, the measurement frame generation unit 110 generates a measurement frame by including transmission timing information indicating the timing of transmitting the measurement frame for each of a plurality of frequencies in the measurement frame.
Subsequently, in step 2, the frame transmission unit 120 transmits the measurement frame generated by the measurement frame generation unit 110 to the communication apparatus 200 at the timing indicated by the transmission timing information included in the measurement frame.

Hereinafter, processing performed by the communication apparatus 200 shown in FIG. 1 in the communication method in the communication system shown in FIG. 1 will be described. FIG. 5 is a flowchart for explaining processing performed by communication device 200 shown in FIG. 1 in the communication method in the communication system shown in FIG.

In step 11, reception timing measurement section 210 measures the reception timing at which the measurement frame transmitted from frame transmission section 120 of communication device 100 is received for each of a plurality of frequencies.
Then, in step 12, the delay time calculation unit 220 determines the delay time of the measurement frame based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit 210. Is calculated for each of a plurality of frequencies.
Subsequently, in step 13, the delay equalization unit 230 balances the delay time calculated by the delay time calculation unit 220 over a plurality of frequencies.

Thus, the communication apparatus 100 transmits a measurement frame including transmission timing information indicating each transmission timing for each of a plurality of frequencies at the transmission timing. The communication apparatus 200 calculates a delay time for each of a plurality of frequencies based on the reception timing at which the measurement frame is received and the transmission timing indicated by the transmission timing information included in the measurement frame. Equilibrate over frequency. Therefore, it is possible to easily obtain the delay characteristics of individual transmission systems using a plurality of frequencies.
(Second Embodiment)

FIG. 6 is a diagram showing a second embodiment of the communication system of the present invention. In the communication system according to this embodiment, as illustrated in FIG. 6, a wireless transmission device 101 and a wireless transmission device 201 are connected via a wireless transmission path 301. The wireless transmission device 101 is a first communication device that inputs the baseband signal 1 from the outside (for example, another communication device). The wireless transmission device 101 transmits a wireless signal to the wireless transmission path 301 using the antenna 102. The wireless transmission device 201 is a second communication device that receives a wireless signal transmitted via the wireless transmission path 301 using the antenna 202. The wireless transmission device 201 transmits the baseband signal 4 to the outside (for example, another communication device).

FIG. 7 is a diagram illustrating an example of an internal configuration of the wireless transmission device 101 illustrated in FIG. As illustrated in FIG. 7, the wireless transmission device 101 illustrated in FIG. 6 includes a modulation unit 131, an IF-RF conversion unit 141, a measurement frame generation unit 111, a frame transmission unit 121, and a bandpass filter 151. . FIG. 7 illustrates an example of main components related to the present embodiment among the components included in the wireless transmission device 101 illustrated in FIG. 6.

The modulation unit 131 modulates the baseband signal 1 transmitted from the outside (for example, another communication device) into a radio frame. Modulation section 131 outputs the modulated radio frame as IF (Intermediate Frequency) signal 161.
The IF-RF converter 141 converts the input IF signal 161 into an RF (Radio Frequency) signal 181 and outputs it.
The measurement frame generation unit 111 generates a predetermined measurement frame (delay characteristic measurement frame 171). At this time, the measurement frame generation unit 111 generates a measurement frame by including transmission timing information indicating the timing of transmitting the measurement frame for each of a plurality of frequencies in the measurement frame. The measurement frame generation unit 111 includes, in the measurement frame, identification information that can identify a group including measurement frames having a delay time with which the wireless transmission device 101 is balanced. In addition, the measurement frame generation unit 111 includes a predetermined flag in the measurement frame. This flag indicates that the frame is “a measurement frame generated by the measurement frame generation unit 111”.
The frame transmission unit 121 transmits the measurement frame generated by the measurement frame generation unit 111 to the communication apparatus 200 at the timing indicated by the transmission timing information included in the measurement frame.
The bandpass filter 151 removes excess frequency components from the input RF signal 181. The band pass filter 151 transmits an RF signal from which an extra frequency component is removed from the antenna 102 to the wireless transmission path 301.

FIG. 8 is a diagram illustrating an example of an internal configuration of the wireless transmission device 201 illustrated in FIG. As shown in FIG. 8, the wireless transmission apparatus 201 shown in FIG. 6 includes a bandpass filter 241, a reception timing measurement unit 211, an RF-IF conversion unit 251, a delay characteristic measurement unit 221, and a delay equalization unit 231. And a demodulator 261. FIG. 8 illustrates an example of main components related to the present embodiment among the components included in the wireless transmission device 201 illustrated in FIG. 6.

The band pass filter 241 removes excess frequency components from the input RF signal and outputs an RF signal 271.
The reception timing measurement unit 211 receives a reception frame (RF signal 271) transmitted from the frame transmission unit 121 of the wireless transmission apparatus 101 and input via the bandpass filter 241 as a plurality of frequencies. Measure every time.
The RF-IF converter 251 converts the input RF signal 271 into an IF signal 272 and outputs it.
The delay characteristic measurement unit 221 calculates a delay time of the measurement frame for each of a plurality of frequencies based on the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit 211. It is a calculation part. Here, the delay characteristic measurement unit 221 calculates the delay time based on the difference between the transmission timing and the reception timing for the reference frequency serving as a reference among the plurality of frequencies and the transmission timing and the reception timing for the other frequencies. calculate. Further, the delay characteristic measuring unit 221 calculates the delay characteristic in the frequency domain of the passing path based on the received measurement frame. The delay characteristic measurement unit 221 outputs the calculated result to the delay equalization unit 231 as delay characteristic information 208.
The delay equalization unit 231 balances the delay time of the IF signal 272 over a plurality of frequencies based on the delay characteristic information 208 output from the delay characteristic measurement unit 221. The delay equalization unit 231 outputs the balanced IF signal to the demodulation unit 261. The IF signal 272 (RF signal 271) has a large delay difference in the frequency domain due to the influence of the

bandpass filters

151 and 241. In order for the delay equalization unit 231 to equalize this delay difference, the delay characteristic measurement unit 221 generates the delay characteristic information 208 before the wireless transmission apparatus 201 starts transferring the baseband signal.
The demodulation unit 261 demodulates the IF signal output from the delay equalization unit 231 to the baseband signal 4 and transmits it to the outside (for example, another communication device).
Note that the measurement frame received by the wireless transmission device 201 passes through the same path as when the baseband signal is transferred, and is received by the delay characteristic measurement unit 221.

Hereinafter, a communication method in the communication system shown in FIG. 6 will be described. First, processing performed by the wireless transmission device 101 illustrated in FIG. 6 in the communication method in the communication system illustrated in FIG. 6 will be described. FIG. 9 is a flowchart for explaining processing performed by the wireless transmission device 101 shown in FIG. 6 in the communication method in the communication system shown in FIG.

First, in step 21, the measurement frame generation unit 111 generates a predetermined measurement frame. At this time, the measurement frame generation unit 111 generates a measurement frame by including transmission timing information indicating the timing of transmitting the measurement frame for each of a plurality of frequencies in the measurement frame.

FIG. 10 is a diagram illustrating an example of the flow of a measurement frame.
As illustrated in FIG. 10, the measurement frame generation unit 111 generates a delay characteristic measurement frame 171 that is a measurement frame for each frequency interval in the transmission frequency band. The measurement frame generation unit 111 finely adjusts the frequency interval for transmitting the delay characteristic measurement frame 171 in a system where the delay difference is considered to be large, or the density at a portion where the delay near the edge of the bandpass filter is steep. It may be changed. The measurement frame generation unit 111 records a transmission time 193 that is a transmission timing at which the wireless transmission apparatus 101 transmits the delay characteristic measurement frame 171 in the delay characteristic measurement frame 171. Further, the measurement frame generation unit 111 is a flag 191 indicating that it is a measurement frame for measuring delay characteristics, and the delay characteristic measurement unit 221 is the same group for calculating the delay difference of each frame. Is also recorded.

Subsequently, in step 22, the frame transmission unit 121 transmits the measurement frame generated by the measurement frame generation unit 111 to the wireless transmission apparatus 201 at the transmission timing indicated by the transmission timing information included in the measurement frame. The frame transmission unit 121 transmits a delay characteristic measurement frame using a modulation method that is resistant to deterioration such as QPSK (Quadrature Phase Shift Keying) so that it can withstand steep delay characteristics. In addition, the delay characteristic measurement frame 171 generated by the measurement frame generation unit 111 is input to the IF-RF conversion unit 141 and passes through the same path as when the baseband signal is transferred.

Hereinafter, processing performed by the wireless transmission device 201 illustrated in FIG. 6 in the communication method in the communication system illustrated in FIG. 6 will be described. FIG. 11 is a flowchart for explaining processing performed by the wireless transmission device 201 shown in FIG. 6 in the communication method in the communication system shown in FIG.

As shown in FIG. 10, the delay characteristic measurement frame 171 transmitted from the frame transmission unit 121 reaches the reception timing measurement unit 211 with a different delay for each frequency according to the frequency characteristic of the signal transfer path 304. Here, the signal transfer path 304 is a transmission path from the frame transmission unit 121 to the reception timing measurement unit 211. The signal transfer path 304 includes a bandpass filter 151, a wireless transmission path 301, and a bandpass filter 241.
In step 31, the reception timing measurement unit 211 determines whether or not a flag is added to the frame transmitted from the frame transmission unit 121 of the wireless transmission device 101. In step 32, the reception timing measuring unit 211 measures the reception timing at which the measurement frame is received for each of a plurality of frequencies, with the frame determined to be flagged as a measurement frame.
Then, in step 33, the delay characteristic measurement unit 221 determines the transmission timing indicated by the transmission timing information included in the measurement frame in which the reception timing measurement unit 211 measures the reception timing, and the reception timing measured by the reception timing measurement unit 211. Based on the above, the delay time of the measurement frame is calculated for each of a plurality of frequencies. At this time, the delay characteristic measurement unit 221 calculates the delay difference for the measurement frames having the same identification information included in the measurement frames. For example, as shown in FIG. 10, assuming that the delay time of the frequency F0 is the reference point (D1 = 0s), the delay difference D1 of the frequency F1 from the frequency F0 is an equation of (r1-r0)-(t1-t0). It is calculated using. Similarly, the delay characteristic 305 of the signal transfer path 304 is obtained by obtaining the delay difference from the reference point of each frequency. As described above, in step 34, the delay characteristic measuring unit 221 calculates the delay characteristic 305 indicating the relationship between the frequency band and the delay time.
In step 35, the delay characteristic measuring unit 221 determines the degree of the reverse characteristic from the obtained delay characteristic 305 and outputs it to the delay equalization unit 231 as the delay characteristic information 208 as shown in FIG. 10. The method for determining the reverse characteristic may be a general method and is not particularly defined.
Subsequently, in step 36, the delay equalization unit 231 multiplies the IF signal 272 by the delay characteristic information 208, which is the inverse characteristic 206 output from the delay characteristic measurement unit 221, and sets the delay time over a plurality of frequencies. Equilibrate. The delay equalization unit 231 outputs the balanced (delay equalization) IF signal 307 to the demodulation unit 261.
The demodulator 261 demodulates the delay equalized IF signal 307 and outputs the baseband signal 4.

Note that the delay characteristic measurement unit 221 may include the reception timing measurement unit 211.

In this way, the delay time is measured for each of a plurality of frequencies using the measurement frame, and the delay characteristic over the frequency band from the reverse characteristic of the delay characteristic based on the difference from the delay time at the reference frequency and the IF signal is delayed. Perform equalization. Thereby, the radio transmission apparatus autonomously determines the optimum reverse characteristic for equalizing the delay characteristic of the radio transmission system. As a result, it is possible to demodulate a radio signal subjected to delay equalization by the demodulator on the receiving side into a baseband signal without having to measure the delay characteristics of the system in advance.

As described above, each function (process) is assigned to each component, but this assignment is not limited to the above. In addition, the configuration described above is merely an example, and the present invention is not limited to this. Moreover, what combined each embodiment may be sufficient.

The processing performed by each component provided in each of the

communication devices

100 and 201 and the

wireless transmission devices

101 and 201 described above may be performed by a logic circuit that is produced according to the purpose. In addition, a computer program (hereinafter referred to as a program) in which processing contents are described as a procedure is recorded on a recording medium that can be read by each of the

communication apparatuses

100 and 201 and the

wireless transmission apparatuses

101 and 201, and is recorded on the recording medium. The program may be read by the

communication devices

100 and 201 and the

wireless transmission devices

101 and 201 and executed. Recording media that can be read by the

communication devices

100 and 201 and the

wireless transmission devices

101 and 201 are a floppy (registered trademark) disk, a magneto-optical disk, a DVD (Digital Versatile Disc), a CD (Compact Disc), and a Blu-ray. (Registered Trademark) In addition to transferable recording media such as Disc, memories such as

communication devices

100 and 201,

wireless transmission devices

101 and 201, such as ROM (Read Only Memory), RAM (Random Access Memory), and HDD ( Hard Disc Drive). The program recorded on this recording medium is read by the CPU provided in each of the

communication devices

100 and 201 and the

wireless transmission devices

101 and 201, and the same processing as described above is performed under the control of the CPU. Here, the CPU operates as a computer that executes a program read from a recording medium on which the program is recorded.

A part or all of the above embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Additional remark 1) It has a 1st communication apparatus and a 2nd communication apparatus,
The first communication device is:
For each of a plurality of frequencies, a measurement frame generator for generating the measurement frame by including transmission timing information indicating the timing of transmitting a predetermined measurement frame in the measurement frame;
A frame transmission unit that transmits the measurement frame generated by the measurement frame generation unit at a timing indicated by transmission timing information included in the measurement frame;
The second communication device is:
A reception timing measuring unit that measures the reception timing at which the measurement frame transmitted from the frame transmission unit is received for each of the plurality of frequencies; and
Delay time for calculating the delay time of the measurement frame for each of the plurality of frequencies based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit A calculation unit;
A communication system comprising: a delay equalization unit that balances the delay time calculated by the delay time calculation unit over the plurality of frequencies.
(Supplementary note 2) The communication according to supplementary note 1, wherein the measurement frame generation unit includes, in the measurement frame, identification information that can identify a group composed of measurement frames having a delay time that is balanced by the delay equalization unit. system.
(Supplementary note 3) The communication system according to supplementary note 1 or supplementary note 2, wherein the measurement frame generation unit includes a predetermined flag in the measurement frame.
(Supplementary note 4) The communication system according to any one of supplementary notes 1 to 3, wherein the frame transmission unit transmits the measurement frame to the second communication device via a wireless transmission path.
(Supplementary Note 5) The delay time calculation unit is based on a difference between a transmission timing and a reception timing for a reference frequency serving as a reference among the plurality of frequencies, and a transmission timing and a reception timing for other frequencies. The communication system according to any one of appendices 1 to 4, which calculates a delay time.
(Supplementary Note 6) For each of a plurality of frequencies, a measurement frame generation unit that generates the measurement frame by including transmission timing information indicating the transmission timing of a predetermined measurement frame in the measurement frame;
A communication apparatus comprising: a frame transmission unit that transmits a measurement frame generated by the measurement frame generation unit at a timing indicated by transmission timing information included in the measurement frame.
(Supplementary note 7) The communication device according to supplementary note 6, wherein the measurement frame generation unit includes identification information that can identify the group when the measurement frame is divided into predetermined groups.
(Supplementary Note 8) A reception timing measurement unit that measures the reception timing at which the measurement frame transmitted for each of the plurality of frequencies is received for each of the plurality of frequencies;
Delay time for calculating the delay time of the measurement frame for each of the plurality of frequencies based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit A calculation unit;
A communication apparatus comprising: a delay equalization unit that balances the delay time calculated by the delay time calculation unit over the plurality of frequencies.
(Supplementary note 9) The delay time calculation unit, based on the difference between the transmission timing and the reception timing for a reference frequency serving as a reference among the plurality of frequencies, and the transmission timing and the reception timing for other frequencies, 9. The communication device according to appendix 8, which calculates a delay time.
(Supplementary Note 10) For each of a plurality of frequencies, transmission timing information indicating the timing of transmitting a predetermined measurement frame is included in the measurement frame to generate the measurement frame,
Transmitting the generated measurement frame at a timing indicated by transmission timing information included in the measurement frame;
The reception timing at which the transmitted measurement frame is received is measured for each of the plurality of frequencies,
Based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the measured reception timing, the delay time of the measurement frame is calculated for each of the plurality of frequencies,
A communication method for balancing the calculated delay time over the plurality of frequencies.
(Supplementary note 11)
For each of a plurality of frequencies, a procedure for generating the measurement frame by including transmission timing information indicating a timing for transmitting a predetermined measurement frame in the measurement frame;
A recording medium recording a program for executing the procedure of transmitting the generated measurement frame at a timing indicated by transmission timing information included in the measurement frame.
(Supplementary note 12)
A procedure for measuring the reception timing at which a measurement frame transmitted for each of a plurality of frequencies is received for each of the plurality of frequencies,
A procedure for calculating a delay time of the measurement frame for each of the plurality of frequencies based on a transmission timing indicated by transmission timing information included in the received measurement frame and the measured reception timing;
A recording medium recording a program for executing the procedure of balancing the calculated delay time over the plurality of frequencies.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

This application claims priority based on Japanese Patent Application No. 2017-046155 filed on Mar. 10, 2017, the entire disclosure of which is incorporated herein.

Claims

A first communication device and a second communication device;
The first communication device is:
For each of a plurality of frequencies, a measurement frame generator for generating the measurement frame by including transmission timing information indicating the timing of transmitting a predetermined measurement frame in the measurement frame;
A frame transmission unit that transmits the measurement frame generated by the measurement frame generation unit at a timing indicated by transmission timing information included in the measurement frame;
The second communication device is:
A reception timing measuring unit that measures the reception timing at which the measurement frame transmitted from the frame transmission unit is received for each of the plurality of frequencies; and
Delay time for calculating the delay time of the measurement frame for each of the plurality of frequencies based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit A calculation unit;
A communication system comprising: a delay equalization unit that balances the delay time calculated by the delay time calculation unit over the plurality of frequencies.
The communication system according to claim 1,
The communication frame in which the measurement frame generation unit includes, in the measurement frame, identification information that can identify a group including measurement frames having a delay time that the delay equalization unit balances.
The communication system according to claim 1 or 2,
The measurement frame generation unit is a communication system that includes a predetermined flag in the measurement frame.
The communication system according to any one of claims 1 to 3,
The frame transmission unit is a communication system that transmits the measurement frame to the second communication device via a wireless transmission path.
The communication system according to any one of claims 1 to 4,
The delay time calculation unit calculates the delay time based on a difference between a transmission timing and a reception timing for a reference frequency serving as a reference among the plurality of frequencies and a transmission timing and a reception timing for other frequencies. Communication system.
For each of a plurality of frequencies, a measurement frame generator for generating the measurement frame by including transmission timing information indicating the timing of transmitting a predetermined measurement frame in the measurement frame;
A communication apparatus comprising: a frame transmission unit that transmits a measurement frame generated by the measurement frame generation unit at a timing indicated by transmission timing information included in the measurement frame.
The communication device according to claim 6.
The measurement frame generation unit includes, in the measurement frame, identification information that can identify the group when the measurement frame is divided into a predetermined group.
A reception timing measurement unit for measuring the reception timing of each of the plurality of frequencies received from the measurement frame transmitted for each of the plurality of frequencies;
Delay time for calculating the delay time of the measurement frame for each of the plurality of frequencies based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the reception timing measured by the reception timing measurement unit A calculation unit;
A communication apparatus comprising: a delay equalization unit that balances the delay time calculated by the delay time calculation unit over the plurality of frequencies.
The communication device according to claim 8.
The delay time calculation unit calculates the delay time based on a difference between a transmission timing and a reception timing for a reference frequency serving as a reference among the plurality of frequencies and a transmission timing and a reception timing for other frequencies. Communication device.
For each of a plurality of frequencies, transmission timing information indicating the timing of transmitting a predetermined measurement frame is included in the measurement frame to generate the measurement frame,
Transmitting the generated measurement frame at a timing indicated by transmission timing information included in the measurement frame;
The reception timing at which the transmitted measurement frame is received is measured for each of the plurality of frequencies,
Based on the transmission timing indicated by the transmission timing information included in the received measurement frame and the measured reception timing, the delay time of the measurement frame is calculated for each of the plurality of frequencies,
A communication method for balancing the calculated delay time over the plurality of frequencies.
On the computer,
For each of a plurality of frequencies, a procedure for generating the measurement frame by including transmission timing information indicating a timing for transmitting a predetermined measurement frame in the measurement frame;
A recording medium recording a program for executing the procedure of transmitting the generated measurement frame at a timing indicated by transmission timing information included in the measurement frame.
On the computer,
A procedure for measuring the reception timing at which a measurement frame transmitted for each of a plurality of frequencies is received for each of the plurality of frequencies,
A procedure for calculating a delay time of the measurement frame for each of the plurality of frequencies based on a transmission timing indicated by transmission timing information included in the received measurement frame and the measured reception timing;
A recording medium recording a program for executing the procedure of balancing the calculated delay time over the plurality of frequencies.