KR102322903B1 - Interworking method for mitigation of interference between unlicensed communication for train operation and unlicensed communication for passenger service - Google Patents

Abstract

The present technology relates to a wireless communication system including a train communication system that communicates with a base station using a plurality of communication channels, and a channel including information about a communication channel used or to be used by the base station among the plurality of communication channels. An on-vehicle communication device for receiving the list, an in-vehicle commercial wireless communication device for generating channel list quality information including information indicating the quality of at least one communication channel among the plurality of communication channels, and transmitting a resource preemption signal in the train and an in-vehicle communication device and a companion device that compares the channel list quality information with the channel list, and controls the communication channel to be used exclusively for communication with the base station.

Description

Interworking method for mitigation of interference between unlicensed communication for train operation and unlicensed communication for passenger service

The present invention relates to a wireless communication system for a railroad vehicle, and more particularly, to an apparatus for preventing interference of a frequency channel between an unlicensed channel communication device for passenger service installed in a railroad vehicle and a communication device for train control and operation.

In the domestic railway system, for passenger service, telecommunications companies install and operate Wi-Fi APs (Access Points). The Wi-Fi AP of the telecommunication company provides Wi-Fi communication service to passengers in the railway system using the ISM bands of the 2 GHz channel and the 5 GHz channel. In addition to this, Wi-Fi communication technology is being utilized not only for passenger service, but also for railway operation and control. For example, domestic urban railways including the Shinbundang Line operate a railway system by applying Wi-Fi-based CBTC (communication-Based Train Control) technology. In addition, Wi-Fi communication technology is applied to communication between the trains of Seoul Line 2 trains.

The Wi-Fi communication technology may be one of wireless communication technologies using an unlicensed frequency channel. For example, the Wi-Fi communication technology described herein may be a communication technology that transmits information using a 2 GHz channel or a 5 GHz channel that is an unlicensed frequency channel that does not require a license.

A Listen Before Talk (LBT) scheme may be applied to the Wi-Fi communication technology in order for different devices to share a frequency channel. The LBT method may be a method in which a device using a wireless communication technology transmits information using the corresponding channel after confirming that the frequency channel to be used is empty before the device using the wireless communication technology uses the frequency channel for information transmission. The empty channel may mean that a device using another wireless communication is not using the corresponding channel.

As Wi-Fi communication technology is increasingly applied to train control and operation, the possibility of interference between Wi-Fi communication for passenger service and Wi-Fi communication for train control and operation may increase. For example, interference may occur when a frequency channel used for Wi-Fi communication for passenger service and a frequency channel used for Wi-Fi communication for transmitting information for train control and operation are common. When interference occurs between communications, communication performance may be degraded. Alternatively, when the LBT method is applied, as the number of frequency channels used for Wi-Fi communication for passenger service increases, the performance of Wi-Fi communication for train control and operation may deteriorate. If the performance of Wi-Fi communication for train control and operation is degraded, it may pose a threat to the safety of passengers on board. An embodiment of the present invention provides a wireless communication system for a train in which information for train control and operation is transmitted stably.

A wireless communication system including a train communication system for communicating with a base station using a plurality of communication channels according to an embodiment of the present invention includes information on a communication channel used or used by the base station among the plurality of communication channels An on-vehicle communication device for receiving a channel list of and an in-vehicle communication device that transmits and a companion device that compares the channel list quality information with the channel list, and controls the communication channel to be used exclusively for communication with the base station.

The wireless communication system of a train that communicates with a base station using a plurality of communication channels according to an embodiment of the present invention receives information about a communication channel to be used or to be used by the base station among the plurality of communication channels through a first interface. A first system to which a list of channels including the information is transmitted, a second system to which a list of available channels in which information about the communication channel is omitted, and a third system to which a list of preempted channels including information about the communication channel is transmitted, is included. do.

The wireless communication system of a train communicating with a base station using a plurality of communication channels according to an embodiment of the present invention includes a channel list including a communication channel used by the base station among the plurality of communication channels through a first interface. A first system including an on-vehicle communication device for providing and a companion device for receiving the channel list, the companion device for generating an available channel list so that the communication channel is preempted by the base station, and a channel included in the available channel list A second system including an in-vehicle commercial wireless communication device performing communication using the companion device and the companion device for generating a preemption channel list including the communication channel so that the communication channel is preempted by the base station and the preemption channel list and a third system including an in-vehicle communication device that performs communication using the selected channel.

According to an embodiment of the present technology, there is provided a wireless communication system of a train in which information for stably controlling and operating a train is transmitted.

1 is a block diagram illustrating a train communication system according to an embodiment of the present invention.
2 is a block diagram illustrating a resource preemption method according to an embodiment of the present invention.
3 is a flowchart illustrating the resource preemption method described in FIG. 2 .
4 is a block diagram illustrating a resource preemption method according to another embodiment of the present invention.
5 is a flowchart illustrating the resource preemption method described in FIG. 4 .
6 is a flowchart illustrating a resource preemption method according to an embodiment in a situation in which the in-vehicle commercial Wi-Fi device and the in-vehicle communication device shown in FIG. 1 exist together in a train.

Specific structural or functional descriptions of the embodiments according to the concept of the present invention disclosed in this specification or application are only exemplified for the purpose of explaining the embodiments according to the concept of the present invention, and implementation according to the concept of the present invention Examples may be embodied in various forms and should not be construed as being limited to the embodiments described in the present specification or application.

Hereinafter, in order to describe in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily implement the technical idea of the present invention, an embodiment of the present invention will be described with reference to the accompanying drawings. .

1 is a block diagram illustrating a train communication system according to an embodiment of the present invention.

Referring to FIG. 1 , a train wireless communication system 10 may include a train communication system 100 and a base station communication system 200 . Various information may be transmitted between the train communication system 100 and the base station communication system 200 . For example, information for train control and operation may be transmitted between the base station communication system 200 and the train communication system 100 . Alternatively, image information may be generated from the CCTV installed in the train communication system 100 , and the generated image information may be transmitted to the base station communication system 200 .

The train communication system 100 may include an on-board communication device 110 and a linkage device 120 . Also, the train communication system 100 may further include at least one of an in-vehicle commercial wireless communication device and an in-vehicle communication device 140 . The in-vehicle commercial wireless communication device may be a concept including the in-vehicle commercial Wi-Fi device 130 . Commercial wireless communication devices in the vehicle may communicate using various wireless communication methods. Hereinafter, the present embodiment will be described using the Wi-Fi method among the wireless communication methods as an example.

The in-vehicle communication device 110 may be a base station installed around a track on which a train moves, or a communication device that transmits or receives information for controlling and operating a train with a preceding train. For example, the in-vehicle communication device 110 may be a communication device that transmits and receives information for train control and operation, not for passenger service in the train.

The in-vehicle commercial Wi-Fi device 130 may be a device installed by a communication operator to provide Wi-Fi communication for passenger service in a train. Specifically, the in-vehicle commercial Wi-Fi device 130 may be a Wi-Fi access point (AP) installed by a communication operator for passenger service in a train.

The in-vehicle communication device 140 may be a device that transmits a resource preemption signal in a train so that the on-board communication device 110 can stably exchange information for train control and operation. The resource preemption signal may be transmitted in the train by a communication channel used when the on-board communication device 110 gives or receives information for train control and operation. A resource may mean an element necessary to perform wireless communication. For example, the resource may include a communication channel used for wireless communication.

The companion device 120 may be a device that interworks different communication devices with each other. In an embodiment, the companion device 120 may be a device for the in-vehicle communication device 110 to interwork with the in-vehicle commercial Wi-Fi device 130 . Alternatively, the companion device 120 may be a device for the in-vehicle communication device 110 to interwork with the in-vehicle communication device 140 . Alternatively, the companion device 120 may be a device for the in-vehicle communication device 110 to interwork with the in-vehicle commercial Wi-Fi device 130 and the in-vehicle communication device 140 . Referring to FIG. 1 , although the companion device 120 and the on-vehicle communication device 110 are illustrated as being separated from each other, the companion device 120 may operate in combination with the on-board communication device 110 . Hereinafter, it is assumed that the companion device 120 is separated from the on-board communication device 110 for convenience of description.

The first interface S1 may be an interface between the on-board communication device 100 and the companion device 120 . Information for train control and operation may be transmitted through the first interface S1. The second interface S2 may be an interface between the in-vehicle commercial Wi-Fi device 130 and the companion device 120 . Channel information may be transmitted through the second interface S2. The third interface S3 may be an interface between the in-vehicle communication device 140 and the companion device 120 . Information on a channel to be used by the in-vehicle communication device 14 may be transmitted through the third interface S3 . Information transmitted through the first to third interfaces S1 to S3 will be described in detail with reference to the drawings to be described later.

2 is a block diagram illustrating a resource preemption method according to an embodiment of the present invention.

Referring to FIG. 2 , the train communication system 100 may include an on-board communication device 110 , a companion device 120 , and an in-vehicle commercial Wi-Fi device 130 . The first interface S1 may be an interface between the on-board communication device 100 and the companion device 120 . The second interface S2 may be an interface between the in-vehicle commercial Wi-Fi device 130 and the companion device 120 .

A base station installed on the ground may provide information for train control and operation to the train communication system 100 on the track. Information for train control and operation may be transmitted using wireless communication technology. A wireless communication technology may be implemented in various ways, but among them, a wireless communication technology using an unlicensed band will be exemplarily described. In particular, the Wi-Fi communication technology among the wireless communication technologies using the unlicensed band will be described as an example, but it is not interpreted as being limited to the embodiment. Wi-Fi communication technology may transmit and receive information using at least one channel. For example, a frequency band used in Wi-Fi communication technology may be divided into N communication channels (N is a positive integer). That is, different channel numbers may indicate different communication channels. In addition, information may be transmitted using at least one communication channel among the N communication channels.

Information may be transmitted between the on-board communication device 100 and the base station included in the train communication system 100 using a specific channel. If there is a change in the channel used at this time, the on-board communication device 100 may detect this and transmit the channel number to the companion device 120 through the first interface S1. The channel number may indicate a frequency band in which information for train control and operation is transmitted between the base station and the train communication system 100 . According to the transmitted information, there may be more than one channel number.

Specifically, when the on-board communication device 110 transmits information for train control and operation to the base station, even using a single Wi-Fi channel may be sufficient. In this case, only one channel is used, and a number corresponding to this channel may be provided to the companion device 120 . On the other hand, when the on-board communication device 110 transmits the CCTV image in the train communication system 100 to the base station communication system 200, a plurality of channels may be used simultaneously for smooth transmission of large-sized information. For example, a channel bonding technique may be applied. In this case, the in-vehicle communication device 100 may use a plurality of channels, and numbers corresponding to the used channels may be provided to the companion device 120 .

Next, the companion device 120 may request channel quality information from the in-vehicle commercial Wi-Fi device 130 through the second interface S2 , and may receive channel quality information in response thereto. The channel quality information received from the in-vehicle commercial Wi-Fi device 130 may be implemented in various forms. For example, a Wi-Fi channel list including N channel numbers may be received from the in-vehicle commercial Wi-Fi 130, and train communication so that the order listed in the Wi-Fi channel list means the quality of each channel It may be predetermined in system 100 . For example, when the companion device 120 receives a Wi-Fi channel list including {the ninth channel, the first channel, and the fifth channel}, the ninth channel has a relatively superior quality and the fifth channel This may have a relatively inferior quality. In another embodiment, the Wi-Fi channel list may also include an index indicating channel quality information. That is, the companion device 120 may receive a Wi-Fi channel list including {(9th channel, 0dB}, (first channel, -3dB), (5th channel, -10dB)}.

The companion device 120 may receive the Wi-Fi channel list through the second interface S2 , and may exclude the channel number received through the first interface S1 from among them. Alternatively, the companion device 120 may receive the Wi-Fi channel list through the second interface S2 and generate an available channel list in which the channel number received through the first interface S1 is omitted. . In another embodiment, the companion device 120 may additionally exclude the channel number including the channel number received from the first interface S1 using its own algorithm. Alternatively, the companion device 120 may generate an available channel list in which the channel number is further omitted including the channel number received from the first interface S1 using its own algorithm. In addition, the companion device 120 may provide the available channel list including the remaining channel numbers to the in-vehicle commercial Wi-Fi device 130 again. The in-vehicle commercial Wi-Fi device 130 may use a channel corresponding to the received channel number.

For example, the list of Wi-Fi channels received through the second interface S2 is {the ninth channel, the first channel, the fifth channel}, and the channel number received through the first interface S1 is the ninth It is assumed that it is a channel. The companion device 120 may provide a list of available channels including the first channel and the fifth channel number excluding the ninth channel to the in-vehicle commercial Wi-Fi device 130 . The in-vehicle commercial Wi-Fi device 130 may use only the first channel and the fifth channel.

As another example, it is assumed that the channel number received through the first interface S1 is the ninth channel, and it is expected that channel bonding is applied between the ninth channel and the fifth channel. Alternatively, it is assumed that there is a high possibility that interference occurs between the ninth channel and the fifth channel. In this case, the companion device 120 may determine not only the ninth channel but also the fifth channel as a channel number to be excluded by itself. In addition, the companion device 120 may provide a list of available channels including the first channel number to the in-vehicle commercial Wi-Fi device 130 . In this case, the in-vehicle commercial Wi-Fi device 130 may use the first channel included in the available channel list.

The in-vehicle commercial Wi-Fi device 130 may receive an available channel list including a channel number from the companion device 120 through the second interface S2 . The in-vehicle commercial Wi-Fi device 130 may select at least one channel from among the channel numbers included in the available channel list and use it for communication. Even when communication is already being performed, if the available channel list is updated through the second interface S2 , the in-vehicle commercial Wi-Fi device 130 may change the channel immediately in response thereto. In the manner described, the communication channel used for the in-vehicle communication device 100 to send and receive information to and from the base station cannot be used by the in-vehicle commercial Wi-Fi device 130, so the corresponding communication channel is connected to the on-board communication device 100 or the base station. can be judged to have been preempted by Alternatively, since the in-vehicle commercial Wi-Fi device 130 cannot use the communication channel used for the on-vehicle communication device 100 to send and receive information to and from the base station, the corresponding communication channel is for communication between the on-board communication device 100 or the base station. can be used exclusively for

3 is a flowchart illustrating the resource preemption method described in FIG. 2 .

In step S310 , the in-vehicle communication device 110 may update the channel list including information on the channel being used or used with the base station and provide the channel list to the companion device 120 . For example, the in-vehicle communication device 110 may additionally use a fifth channel while communicating with the base station using the first channel. In this case, the in-vehicle communication device 110 may update the channel list to include the first channel and the fifth channel, and provide the updated channel list to the companion device 120 . The channel list may be updated at regular intervals. Alternatively, in the case of a sudden increase in the amount of information transmission, the channel list may be updated aperiodically.

In step S320 , the companion device 120 may request channel list quality information from the in-vehicle commercial Wi-Fi device 130 through the second interface S2 .

In step S330 , the in-vehicle commercial Wi-Fi device 130 may provide channel list quality information in response to the request of the companion device 120 . Even in this case, channel list quality information may be provided through the second interface S2. The order of the channel numbers included in the channel list quality information may be predetermined to indicate the quality of each channel. For example, the channel list quality information may be {fifth channel, ninth channel, seventh channel, eighth channel}.

In step S340, the companion device 120 may generate a list of available channels that can be used by the in-vehicle commercial Wi-Fi device by excluding the channel number received from the in-vehicle communication device 110 from the received channel list quality information. . In addition, the companion device 120 may provide the generated available channel list to the in-vehicle commercial Wi-Fi device 130 . For example, available channels including {9th channel, 7th channel, 8th channel} except for the 1st channel and 5th channel among {5th channel, 9th channel, 7th channel, 8th channel} The list may be provided to the in-vehicle commercial Wi-Fi device 130 . As another example, since the order of the channel list means the quality of the channels, the available channel list including {the ninth channel} having relatively superior quality may be provided to the in-vehicle commercial Wi-Fi device 130 . Upon receiving the available channel list, the in-vehicle commercial Wi-Fi device 130 may communicate with the user terminal in the train using a channel included in the available channel list.

4 is a block diagram illustrating a resource preemption method according to another embodiment of the present invention.

Referring to FIG. 4 , the train communication system 100 may include an on-board communication device 110 , an interlocking device 120 , and an in-vehicle communication device 140 . The first interface S1 may be an interface between the on-board communication device 100 and the companion device 120 . The third interface S3 may be an interface between the in-vehicle communication device 130 and the companion device 120 . The content overlapping with FIG. 2 will be excluded, and differences will be mainly described.

The in-vehicle communication device 140 may perform an operation of preempting a channel to be used by the in-vehicle communication device 110 for communication with the base station. Due to the characteristics of wireless communication technology, when it is detected that a specific frequency channel is already being used by a specific wireless communication device, other wireless communication devices do not use the corresponding frequency channel. Using this, the channel can be preempted.

Specifically, information may be transmitted between the on-board communication device 100 and the base station included in the train communication system 100 using a specific channel. The in-vehicle communication device 100 may transmit a channel list including a channel number in use or to be used to the companion device 120 through the first interface S1 . The channel number may indicate a frequency band in which information for train control and operation is transmitted between the base station and the train communication system 100 . According to the transmitted information, there may be more than one channel number.

The companion device 120 may provide the preemption channel list to the in-vehicle communication device 140 through the third interface S3 . The preemption channel list provided through the third interface S3 may be the same as the channel number included in the channel list received through the first interface S1, or several channel numbers may be added. For example, the preemption channel list may further include a channel number that is highly likely to cause interference with a channel number received through the first interface S1.

The companion device 120 may request and receive information such as the operation time, transmission period, transmission time, and packet size of the train control signal periodically provided by the on-board communication device 110 using the first interface S1. have. The operation time information may be information for determining the absolute time of a train control signal that is periodically transmitted. The transmission time and packet size information may be information for generating dummy data. In addition, the companion device 120 may generate dummy data. The companion device 120 may provide the in-vehicle communication device 140 with dummy data generated at a time earlier by T(s) than the time when the on-board communication device 110 periodically transmits the train control signal. The in-vehicle communication device 140 may receive the dummy data and attempt to access a radio resource using a channel corresponding to the preemption channel number received from the companion device 120 . If wireless resource access is successful, the in-vehicle communication device 140 may transmit dummy data. The wireless communication device in the train detects the frequency used by the in-vehicle communication device 140 to transmit the dummy data, and may not use the corresponding channel. For example, a personal router such as an LTE egg of a passenger in a train detects a frequency used by the in-vehicle communication device 140 and will not use the corresponding channel for communication. Accordingly, the corresponding channel may be preempted by the on-board communication device 110 or the base station. That is, the corresponding channel may be used exclusively for communication between the on-board communication device 100 or the base station. In this case, the in-vehicle communication device 140 may be designed using a directional antenna. Since a frequency transmission area can be controlled by the directional antenna, interference with the on-board communication device 110 can be minimized.

5 is a flowchart illustrating the resource preemption method described in FIG. 4 .

In step S510 , the on-vehicle communication device 110 may update the channel list including information on the channel being used or used with the base station and provide the channel list to the companion device 120 . For example, the in-vehicle communication device 110 may additionally use a fifth channel while communicating with the base station using the first channel. In this case, the in-vehicle communication device 110 may update the channel list to include the first channel and the fifth channel, and provide the updated channel list to the companion device 120 . The channel list may be updated at regular intervals. Alternatively, in the case of a sudden increase in the amount of information transmission, the channel list may be updated aperiodically.

In operation S520 , the companion device 120 may provide the preemption channel list to the in-vehicle communication device 140 . The preemption channel list may include channel information for in-vehicle communication. The preemption channel list may include a channel number included in the channel list provided by the on-vehicle communication device 110 and additionally a channel number. For example, when the first channel and the fifth channel are included in the channel list received from the on-board communication device 110 , the companion device 120 selects the second channel, the fourth channel, the sixth channel, and the seventh channel. The preemption channel list further including may be provided to the in-vehicle communication device 140 . This is a result of determining that the companion device 120 includes an additional channel by itself, since interference between adjacent channels in the 2 GHz band is highly likely.

In step S530 , the companion device 120 may request control information from the on-board communication device 110 . The control information may include information such as an operation time, a transmission period, a transmission time, and a packet size of a train control signal periodically provided by the on-board communication device 110 .

In step S540 , the on-board communication device 110 may provide control information to the companion device 120 in response to a request received from the companion device 120 .

In operation S550 , the companion device 120 may receive control information and generate dummy data. The companion device 120 may provide the in-vehicle communication device 140 with dummy data generated at a time preceding the transmission period of the control signal by T(s).

In operation S560 , the in-vehicle communication device 140 may transmit the received dummy data through a channel included in the preemption channel list. Accordingly, the wireless communication device in the train will detect that the channel is already in use, and will not use the channel. The corresponding channel may be preempted by the on-board communication device 110 .

6 is a flowchart illustrating a resource preemption method according to an embodiment in a situation in which the in-vehicle commercial Wi-Fi device and the in-vehicle communication device shown in FIG. 1 exist together in a train.

In step S610, the on-board communication device 110 updates the channel list including information about the channel being used or used with the base station, and provides the channel list to the companion device 120 through the first interface S1. have.

In step S620 , the companion device 120 may request channel list quality information from the in-vehicle commercial Wi-Fi device 130 through the second interface S2 .

In step S630 , the in-vehicle commercial Wi-Fi device 130 may provide channel list quality information in response to the request of the companion device 120 . Even in this case, channel list quality information may be provided through the second interface S2. Since the channel list quality information has already been described above, a redundant description will be omitted.

In step S640, the companion device 120 may generate a list of available channels that can be used by the in-vehicle commercial Wi-Fi device by excluding the channel number received from the in-vehicle communication device 110 from the received channel list quality information. . In addition, the companion device 120 may provide the generated available channel list to the in-vehicle commercial Wi-Fi device 130 through the second interface S2 . The in-vehicle commercial Wi-Fi device 130 may perform communication using a channel included in the available channel list. A channel included in the list of available channels may be different from a channel used by the on-vehicle communication device 110 with the base station. That is, since the in-vehicle commercial Wi-Fi device 130 cannot use the channel used by the on-vehicle communication device 110 with the base station, it may be preempted by the on-vehicle communication device 110 . Since only information for train control and operation may be transmitted through the preempted channel, stable and safe train operation may be possible.

In operation S650 , the companion device 120 may provide the preemption channel list to the in-vehicle communication device 140 . The preemption channel list may include channel information for in-vehicle communication. The preemption channel list may include a channel number included in the channel list provided by the on-vehicle communication device 110 .

In step S660 , the companion device 120 may request control information from the on-board communication device 110 .

In step S670 , the on-board communication device 110 may provide control information to the companion device 120 in response to a request received from the companion device 120 .

In operation S680 , the companion device 120 may receive control information and generate dummy data. The generated dummy data may be provided to the in-vehicle communication device 140 .

In operation S690 , the in-vehicle communication device 140 may transmit the received dummy data through a channel included in the preemption channel list. The channel included in the preemption channel list may be the same channel as the channel to be used or used by the on-vehicle communication device 110 or a channel adjacent thereto. As the in-vehicle communication device 140 uses a channel included in the preemption channel list, the wireless communication device in the train may detect that the corresponding channel is already in use. And wireless communication devices in the train will not use that channel. That is, the corresponding channel may be preempted by the on-board communication device 110 .

Referring to FIG. 6 , the companion device 120 may provide the in-vehicle commercial Wi-Fi device 130 with a list of available channels excluding channels used or used by the in-vehicle communication device 110 . Thereafter, the companion device 120 may provide the in-vehicle communication device 140 with a preemption channel list including channels used or used by the on-vehicle communication device 110 . This is to preferentially preempt a channel because the in-vehicle commercial Wi-Fi device 130 is always performing communication, so interference is highly likely to occur. On the other hand, there may be no hotspots or LTE eggs for portable terminal devices, which are personal routers. Accordingly, providing the preemption channel list to the in-vehicle communication device 140 may be performed later than providing the available channel list.

10: Train wireless communication system
100: train communication system
200: base station communication system
110: on-board communication device
120: interlocking device
130: In-vehicle commercial Wi-Fi device
140: in-vehicle communication device

Claims (11)

In the wireless communication system of a train communicating with a base station using a plurality of communication channels,
an in-vehicle communication device for receiving a channel list including information on a first communication channel to be used or used by the base station among the plurality of communication channels;
an in-vehicle commercial wireless communication device for generating channel list quality information including information indicating the quality of at least one communication channel among the plurality of communication channels;
an in-vehicle communication device for transmitting a resource preemption signal including dummy data in the train; and
Comparing the channel list quality information with the channel list, a companion device for controlling the first communication channel to be used exclusively for communication with the base station;
The interlocking device is
generating the dummy data and providing the dummy data to the in-vehicle communication device;
request control information including a transmission period of a train control signal periodically provided by the on-board communication device to the on-board communication device, and receive the control information from the on-board communication device,
and providing the dummy data to the in-vehicle communication device in advance of the transmission period by a predetermined time.
delete The method of claim 1,
The on-board communication device provides the channel list to the companion device,
and the companion device requests the in-vehicle commercial wireless communication device to provide the channel list quality information.
The method of claim 1,
The channel list quality information includes a list of second communication channels having good quality in the order described,
and the companion device provides a list of available channels in which the first communication channel is omitted from the second communication channels to the in-vehicle commercial wireless communication device.
According to claim 4, The linkage device,
A list of available channels in which the first communication channel and a third communication channel to which the channel bonding is applied are determined from among the plurality of communication channels, and the first communication channel and the third communication channel are omitted from the second communication channels A wireless communication system for providing the in-vehicle commercial wireless communication device.
According to claim 4, wherein the in-vehicle commercial wireless communication device,
A wireless communication system for performing communication using a communication channel included in the available channel list.
According to claim 1, wherein the linkage device,
and providing a list of preemption channels including the first communication channel to the in-vehicle communication device.
The method of claim 7, wherein the in-vehicle communication device comprises:
A wireless communication system for transmitting the resource preemption signal using a communication channel included in the preemption channel list.
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