JP7243809B2 - Wireless communication device, wireless communication method, and program - Google Patents

Description

TECHNICAL FIELD The present invention relates to wireless communication devices, wireless communication methods, and non-transitory computer-readable media.

Patent Document 1 (Japanese Patent No. 6151073) discloses a technique of collecting communication quality information measured by each wireless station and changing a communication path or frequency channel based on this communication quality information.

In the configuration of Patent Document 1, there is still room for improvement in terms of communication quality.

An object of the present disclosure is to provide a technique for solving any of the problems described above.

According to a first aspect of the present invention, a wireless communication device includes a communication quality information storage unit that stores communication quality information that associates a plurality of channels with an index value indicating communication quality thereof for each of a plurality of points. Prepare. The wireless communication device includes a channel selection unit that selects a channel to be used from the plurality of channels based on the communication quality information. The wireless communication device includes a communication section that communicates using the channel selected by the channel selection section.
According to a second aspect of the present invention, a wireless communication method provides, for each of a plurality of points, a plurality of channels based on communication quality information that associates a plurality of channels with an index value indicating the communication quality thereof, from the plurality of channels It includes a channel selection step for selecting the channel to use. The wireless communication method includes a communication step of communicating using the channel selected in the channel selection step.

According to the present invention, it is possible to improve communication quality in wireless communication.

3 is a functional block diagram of a wireless communication device; FIG. (First embodiment) 1 is a schematic diagram of a wireless communication system; FIG. (Second embodiment) 3 is a functional block diagram of a wireless communication device; FIG. (Second embodiment) FIG. 4 is an explanatory diagram of communication quality information; (Second embodiment) It is a preliminary preparation flow of a wireless communication device. (Second embodiment) 4 is a channel selection flow of a wireless communication device; (Second embodiment) 4 is a channel selection trigger flow of a wireless communication device; (Second embodiment) FIG. 10 is an explanatory diagram relating to a channel selection flow; (Second embodiment) FIG. 10 is an explanatory diagram relating to a channel selection trigger flow; (Second embodiment)

(First embodiment)
A first embodiment will be described below with reference to FIG.

As shown in FIG. 1, the wireless communication device 1 includes a CPU 1a (Central Processing Unit) as a central processing unit, a readable and writable RAM 1b (Random Access Memory), and a read-only ROM 1c (Read Only Memory). . Then, the CPU 1a reads out and executes the control program stored in the ROM 1c, and the control program causes hardware such as the CPU 1a to function as the communication quality information storage unit 2, the channel selection unit 3, and the communication unit 4.

The communication quality information storage unit 2 stores communication quality information that associates a plurality of channels with an index value indicating the communication quality thereof for each of a plurality of points.

A channel selection unit 3 selects a channel to be used from a plurality of channels based on the communication quality information.

The communication section 4 communicates using the channel selected by the channel selection section 3 .

According to the above configuration, it is possible to improve communication quality in wireless communication.

(Second embodiment)
The second embodiment will be described below with reference to FIGS. 2 to 9. FIG.

FIG. 2 shows a fire radio system 5 as an example of a radio communication system. The fire fighting radio system 5 includes a communication device 6 a installed at a fire fighting headquarters 6 , a plurality of base stations 7 , and a radio communication device 8 a as a mobile station mounted on a fire fighting vehicle 8 .

As an example, the communication device 6a of the fire department 6 and the plurality of base stations 7 are configured to be capable of two-way communication by wire.

The plurality of base stations 7 and the wireless communication device 8a of the fire engine 8 are configured to be capable of two-way wireless communication. The SCPC (Single Channel Per Carrier) method is adopted as a wireless communication method between the plurality of base stations 7 and the wireless communication device 8a of the fire engine 8, for example. The SCPC system is a kind of frequency division multiple access, and is a transmission system in which one carrier is assigned to one audio channel. The SCPC method is particularly suitable for use in voice communications. However, instead of the SCPC method, a TDMA (Time Division Multiple Access) method may be adopted.

A plurality of base stations 7 wirelessly communicate with the wireless communication device 8a of the fire engine vehicle 8 using mutually different channels. That is, the wireless communication device 8a of the fire engine 8 wirelessly communicates with the base station 7 via the channel used by any one of the plurality of base stations 7 .

In this embodiment, the fire radio system 5 will be described as an example of a radio communication system, but other radio systems such as a police radio system may be used instead of the fire radio system 5 .

FIG. 3 shows a functional block diagram of the wireless communication device 8a of the fire engine 8. As shown in FIG. The wireless communication device 8a includes a CPU 9a (Central Processing Unit) as a central processing unit, a readable and writable RAM 9b (Random Access Memory), a read-only ROM 9c (Read Only Memory), and a GPS receiver 9d (Global Positioning Satellite). I have. When the CPU 9a reads out and executes the control program stored in the ROM 9c, the control program causes the hardware such as the CPU 9a to function as the current location information acquiring section 11 and the index value measuring section 12. Similarly, the control program controls hardware such as the CPU 9a as a communication quality information generation unit 13, a communication quality information storage unit 14, a destination information acquisition unit 20, a route information generation unit 21, a route guidance unit 22, and a passing point determination unit. 23 , a channel selection unit 24 and a communication unit 25 .

The current location information acquisition unit 11 receives and acquires current location information indicating the current location of the wireless communication device 8a from the GPS receiver 9d. The wireless communication device 8a may be provided with a GLONASS receiver (Global Navigation Satellite System) instead of the GPS receiver 9d.

The index value measurement unit 12 measures index values indicating the communication quality of a plurality of channels at the current location of the wireless communication device 8a. Indicator values indicating communication quality include, for example, RSSI (Received Signal Strength Indicator) and BER (bit error rate). The higher the index value of RSSI, the higher the communication quality. Therefore, it can be said that the higher the RSSI, the better the indicator value. On the other hand, the lower the BER index value, the higher the communication quality. Therefore, it can be said that the lower the BER, the better the index value. In the following description, the present embodiment assumes that the indicator value indicating communication quality is RSSI.

The communication quality information generation unit 13 generates communication quality information that associates a plurality of channels with their RSSIs for each of a plurality of points, and stores the generated communication quality information in the communication quality information storage unit 14 . Table 1 below shows, in table form, channel A and channel B, and communication quality information associated with their RSSI for each of the plurality of points P1 to P5 shown in FIG. In Table 1 below, "ChA" means channel A and "ChB" means channel B. In FIG. 4, a base station 7A is a base station 7 that uses channel A for communication. A base station 7B is a base station 7 that uses channel B for communication. As shown in FIG. 4, the plurality of points P1-P5 are defined, as an example, along the main road M frequently used by the fire engine 8. As shown in FIG.

The distances between a plurality of points P1-P5 shown in FIG. 4 correspond to the density of buildings at each point P1-P5. That is, when buildings are densely built, there is a possibility that the communication quality may be locally deteriorated due to the influence of waves reflected by the buildings. Therefore, in areas where buildings are densely built, the distance between each point P1-P5 is set relatively short, and in areas where buildings are not densely built, the distance between each point P1-P5 is set relatively set long. For example, if the density of buildings within a 1-kilometer radius of point P2 is X buildings per square kilometer, the distance between point P1 and point P2 is defined by function F1(X). Similarly, the distance between points P2 and P3 is defined by the function F2(X).

The destination information acquisition unit 20 acquires destination information regarding a destination based on an input by the crew of the fire engine 8 or based on a command from the outside.

The route information generation unit 21 generates route information regarding a route from the current location to the destination based on the current location information and the destination information.

The route guidance unit 22 guides the route to the destination based on the above route information.

The passing point determination unit 23 determines points through which the fire engine 8 will pass from now on, from among the plurality of points P1 to P5, based on the current location information and the route information. Specifically, the passing point determination unit 23 determines the next point through which the fire engine 8 will pass from among the plurality of points P1 to P5 based on the current location information and the route information. For example, when the fire engine 8 is moving between the points P3 and P4 as shown in FIG. .

The channel selection unit 24 selects a channel to be used from a plurality of channels based on the communication quality information stored in the communication quality information storage unit 14. FIG. Specifically, it will be described later.

The communication unit 25 uses the channel selected by the channel selection unit 24 to communicate with the base station 7 corresponding to the channel.

Next, the control flow of the wireless communication device 8a will be described with reference to FIGS. 5 to 9. FIG. The control flow of the wireless communication device 8a includes a preparation flow before operation of the fire wireless system 5, shown from step S1 to step S15 in FIG. The control flow of the radio communication device 8a includes the operational flow during the operation of the fire radio system 5 shown from step S20 in FIG. 6 to step S44 in FIG. In this embodiment, it is assumed that the wireless communication device 8a executes both the preparation flow and the operation flow. However, the advance preparation flow may be executed by a device different from the wireless communication device 8a.

(Advance preparation flow)
First, based on FIG. 5, the advance preparation flow will be described. The advance preparation flow is a flow for generating communication quality information. In the preparation flow, the fire engine 8 is driven within the service area of the fire radio system 5, and the RSSI of a plurality of channels is measured at each of a plurality of points to generate communication quality information. For convenience of explanation, the fire engine 8 is assumed to run within the service areas of the base stations 7A and 7B, as shown in FIG.

S1:
First, when the fire engine 8 starts moving, the current location information acquisition unit 11 acquires current location information.

S2:
Almost at the same time as step S1, the index value measuring unit 12 measures the RSSI of channel A (ChA) and channel B (ChB) at the current location.

S3-S4:
Next, the communication quality information generation unit 13 generates communication quality information that associates the current location information, channel A and channel B, and their RSSI (S3), and stores the generated communication quality information in communication quality information storage. It is stored in the unit 14 (S4).

S10:
Next, while the fire engine 8 is moving within the service area of the fire radio system 5, the current location information acquisition unit 11 acquires current location information.

S11:
Next, the wireless communication device 8a calculates the amount of movement from the previously measured point, and determines whether or not this amount of movement is longer than the first distance. When determining that the movement amount is not longer than the first distance (S11: NO), the index value measurement unit 12 returns the process to step S10. On the other hand, when determining that the movement amount is longer than the first distance (S11: YES), the index value measurement unit 12 advances the process to step S12. The above first distance can be appropriately determined according to the density of buildings at the current location, as described above.

S12:
Almost at the same time as step S10, the index value measuring unit 12 measures the RSSI of channel A (ChA) and channel B (ChB) at the current location.

S13-S14:
Next, the communication quality information generation unit 13 generates communication quality information that associates the current location information, channel A and channel B, and their RSSI (S13), and stores the generated communication quality information in communication quality information storage. It is stored in the unit 14 (S14).

Next, the wireless communication device 8a determines whether or not investigation of a predetermined investigation range has been completed. When determining that the investigation has been completed (S15: YES), the wireless communication device 8a advances the process to step S20 in FIG. On the other hand, if it is determined that the investigation has not been completed (S15: NO), the wireless communication device 8a returns the process to S10.

According to the preliminary flow described above, communication quality information is generated in which a plurality of channels and their index values are associated with each of a plurality of points.

(operation flow)
Next, the operation flow will be described based on FIGS. 6 and 7. FIG. The operational flow is a flow for selecting a channel to be used from among a plurality of channels based on communication quality information when the fire engine 8 moves within the service area of the fire wireless system 5 . For convenience of explanation, the fire engine 8 is assumed to run within the service areas of the base stations 7A and 7B, as shown in FIG. 4, as in the preparation flow. The operation flow below includes a route guidance start flow from step S20 to step S23 in FIG. 6 and a channel selection flow from step S24 to step S36 in FIG. The operational flow below further includes a channel selection trigger flow from step S40 to step S44 in FIG. The channel selection flow is for selecting a channel to be used by the communication unit 25 of the wireless communication device 8a when the fire engine 8 leaves the fire station or while the fire engine 8 is moving. The channel selection trigger flow is a flow that triggers execution of the channel selection flow while the fire engine 8 is moving.

(Route guidance start flow)
S20:
First, when the fire engine 8 leaves the fire station and starts moving, the destination information acquisition unit 20 acquires destination information.

S21:
Next, the current location information acquisition unit 11 acquires current location information.

S22:
Next, the route information generator 21 generates route information based on the destination information and the current location information.

S23:
Next, the route guidance unit 22 starts route guidance based on the route information.

(Channel selection flow)
Next, the channel selection flow will be described with reference to steps S24 to S36 in FIG.

S24:
First, the index value measuring unit 12 measures the RSSI of channel A at the current location (ChA_Cur_RSSI) and the RSSI of channel B at the current location (ChB_Cur_RSSI).

S25:
Next, the passing point determination unit 23 determines the point through which the fire engine 8 will pass next, among the plurality of points recorded in the communication quality information, based on the current location information and the route information. Hereinafter, this point is simply referred to as a passing point.

S26:
Next, the channel selection unit 24 reads and acquires the channel A RSSI (ChA_Nex_RSSI) at the transit point and the channel B RSSI (ChB_Nex_RSSI) at the transit point from the communication quality information storage unit 14 .

S27:
Next, the channel selector 24 determines whether ChA_Nex_RSSI is greater than ChB_Nex_RSSI. When it is determined that ChA_Nex_RSSI is greater than ChB_Nex_RSSI (S27: YES), the channel selector 24 advances the process to step S30. On the other hand, when it is determined that ChA_Nex_RSSI is not greater than ChB_Nex_RSSI (S27: NO), the channel selector 24 advances the process to step S31.

S30, S33, S34:
In step S30, the channel selection unit 24 determines whether ChA_Cur_RSSI is greater than the reference index value Th1. When it is determined that ChA_Cur_RSSI is greater than the reference index value Th1 (S30: YES), the channel selector 24 selects channel A (S33). Then, the communication unit 25 starts communication using channel A (S34). On the other hand, when it is determined in step S30 that ChA_Cur_RSSI is not greater than the reference index value Th1 (S30: NO), the channel selector 24 advances the process to step S32. Note that the reference index value Th1 is the minimum RSSI required to maintain favorable commodity quality. The reference index value Th1 is a specific example of the first index value.

S31, S35, S36:
In step S31, the channel selection unit 24 determines whether ChB_Cur_RSSI is greater than the reference index value Th1. When it is determined that ChB_Cur_RSSI is greater than the reference index value Th1 (S31: YES), the channel selector 24 selects channel B (S35). Then, the communication unit 25 starts communication using channel B (S36). On the other hand, when it is determined in step S31 that ChB_Cur_RSSI is not greater than the reference index value Th1 (S31: NO), the channel selector 24 advances the process to step S32.

S32:
In step S32, the channel selector 24 determines whether ChA_Cur_RSSI is greater than ChB_Cur_RSSI. When it is determined that ChA_Cur_RSSI is greater than ChB_Cur_RSSI (S32: YES), channel selector 24 selects channel A (S33). Then, the communication unit 25 starts communication using channel A (S34). On the other hand, when it is determined that ChA_Cur_RSSI is not greater than ChB_Cur_RSSI (S32: NO), channel selector 24 selects channel B (S35). Then, the communication unit 25 starts communication using channel B (S36).

Here, the channel selection flow described above will be explained again by applying it to a specific example. FIG. 8 shows how the fire engine 8 leaving the fire station indicated by the point Q1 moves to the destination via the point Q2. Table 2 below shows the RSSI of each channel at points Q1 and Q2. Assume that the fire engine 8 is currently located at the point Q1.

In the above example, ChA_Cur_RSSI is 33.0 dBμV, ChB_Cur_RSSI is 22.5 dBμV, ChA_Nex_RSSI is not measurable, and ChB_Nex_RSSI is 34.0 dBμV. Also, the reference index value Th1 in the flow of FIG. 6 is assumed to be 25.0 dBμV.

Therefore, in the flow of FIG. 6, NO is determined in step S27, NO is determined in step S31, and YES is determined in step S32. Therefore, as a result, the channel selection unit 24 selects channel A (S33). These determination results have the following technical significance.

That is, when selecting a channel, the RSSI at the transit point is taken into consideration as shown in step S27, and the RSSI at the transit point is read in advance to prevent deterioration of communication quality.

Also, even if a channel is selected based on the RSSI at the transit point, if the RSSI at the current location of the channel is not sufficient as shown in steps S30 and S31, the channel to be used is selected as follows. I have to. That is, the channel to be used is selected based on the RSSI of each channel at the current location. As a result, the RSSI at the current location is not neglected by placing too much importance on the RSSI at the passing point, and the RSSI for the entire moving route of the fire engine 8 can be reliably secured.

As shown in FIG. 6, the channel selection unit 24 selects only two channels, channel A and channel B, as the channel options. However, the options may be three or more channels. . In this case, in steps S27 and S32, branch processing is executed so that the channel corresponding to the highest RSSI is preferentially selected.

(Channel selection trigger flow)
Next, the channel selection trigger flow will be described with reference to steps S40 to S44 of FIG.

S40:
First, the index value measuring unit 12 measures the RSSI (UseCh_Cur_RSSI) at the current location of the currently used channel.

S41:
Next, the channel selection unit 24 determines whether UseCh_Cur_RSSI is smaller than the reference index value Th3. If UseCh_Cur_RSSI is smaller than the reference index value Th3 (S41: YES), the channel selector 24 advances the process to step S42. On the other hand, if UseCh_Cur_RSSI is not smaller than the reference index value Th3 (S41: NO), the channel selector 24 returns the process to step S40. Note that the reference index value Th3 is the minimum RSSI required to maintain favorable commodity quality. Note that the reference index value Th3 is a specific example of the third index value.

S42:
In step S42, the passing point determination unit 23 determines the passing points described above.

S43:
Next, the channel selection unit 24 acquires the RSSI (UseCh_Nex_RSSI) at the passing point of the currently used channel.

S44:
Next, the channel selection unit 24 determines whether UseCh_Nex_RSSI is smaller than the reference index value Th2. If UseCh_Nex_RSSI is smaller than the reference index value Th2 (S44: YES), the channel selector 24 executes the channel selection flow by returning the process to step S24 in FIG. On the other hand, if UseCh_Nex_RSSI is not smaller than the reference index value Th2 (S44: NO), the channel selector 24 returns the process to step S40. It should be noted that the reference index value Th2 is the minimum RSSI required to maintain favorable commodity quality. Note that the reference index value Th2 is a specific example of the fourth index value.

Here, the channel selection trigger flow described above will be explained again by applying it to specific cases, that is, cases 1 and 2. FIG.

(Case 1)
FIG. 9 shows that the current position of the fire engine 8 that left the fire station is point R1 and that it is moving toward point R2. Table 3 below shows the RSSI of the currently used channel at location R1 and location R2.

In the above example, UseCh_Cur_RSSI is 22.5 dBμV, UseCh_Nex_RSSI is unmeasurable, and reference index value Th3 and reference index value Th2 in FIG. 7 are both 25.0 dBμV.

Therefore, in the flow of FIG. 7, YES is determined in step S41, and YES is determined in step S44. Therefore, as a result, the channel selection unit 24 executes the channel selection flow shown in FIG.

(Case 2)
Table 4 below shows the RSSI of the currently used channel at location R1 and location R2.

In the above example, UseCh_Cur_RSSI is 22.5 dBμV, UseCh_Nex_RSSI is 0.34.0 dBμV, and reference index value Th3 and reference index value Th2 in FIG. 7 are both 25.0 dBμV.

Therefore, in the flow of FIG. 7, YES is determined in step S41, and NO is determined in step S44. Therefore, as a result, the channel selection unit 24 continues to select the currently used channel without executing the channel selection flow shown in FIG.

These determination results have the following technical significance.

That is, when the RSSI of the currently used channel at the current location has decreased (S41: YES), the channel selector 24 makes the following determinations. That is, as shown in step S44, the channel selection unit 24 determines whether or not it is necessary to switch the channel based on the RSSI at the passing point of the currently used channel. For example, if the RSSI at the passing point of the currently used channel is smaller than the reference index value Th2 (S44: YES), the RSSI of the currently used channel is expected to deteriorate in the future. is processed as follows: That is, the channel selection unit 24 returns the processing to step S24 in FIG. 6 so as to actively switch the channel to be used before the RSSI of the channel currently being used deteriorates.

On the other hand, if the RSSI at the passing point of the currently used channel is not smaller than the reference index value Th2 (S44: NO), the channel selection unit 24 processes as follows. That is, since the RSSI of the currently used channel is expected to recover in the future, the channel selection unit 24 continues to select the currently used channel. As a result, even if the RSSI of the currently used channel is temporarily degraded for some reason, channel switching is suppressed, thereby preventing substantial degradation of communication quality due to frequent channel switching. can.

The second embodiment of the present invention has been described above, and the second embodiment has the following features.

That is, as shown in FIG. 3, the wireless communication device 8a includes a communication quality information storage section 14, a channel selection section 24, and a communication section 25. FIG. The communication quality information storage unit 14 stores communication quality information that associates a plurality of channels with RSSI as an index value indicating communication quality thereof for each of a plurality of points. A channel selection unit 24 selects a channel to be used from a plurality of channels based on the communication quality information. The communication section 25 communicates using the channel selected by the channel selection section 24 . According to the above configuration, it is possible to improve communication quality in wireless communication.

In addition, as shown in FIG. 6, the channel selection unit 24 selects a channel to be used from a plurality of channels based on the RSSI at the next passing point among the plurality of points (S27). According to the above configuration, future communication quality can be improved.

Note that the channel selection unit 24 may select a channel to be used from a plurality of channels, for example, based on the RSSI at a point through which the vehicle will pass in the future among the plurality of points. That is, the channel selection unit 24 may select a channel to be used from a plurality of channels, for example, based on the RSSI at the next next passing point among the plurality of points.

Also, the channel selection unit 24 selects the channel corresponding to the best RSSI at the next passing point (S27). According to the above configuration, future communication quality can be further improved.

Moreover, the wireless communication device 8a further includes an index value measurement unit 12 that measures RSSI of a plurality of channels at the current location. When the RSSI at the current location of the channel corresponding to the best RSSI at the next passing point is worse than the reference index value Th1 as the first index value, the channel selection unit 24 performs the following processing. That is, the channel selection unit 24 selects a channel to be used from a plurality of channels based on the RSSI of the plurality of channels at the current location. According to the above configuration, the current communication quality is not sacrificed.

The wireless communication device 8a further includes an index value measurement unit 12 that measures the RSSI of the currently used channel at the current location. If the RSSI of the currently used channel at the next passing point is worse than the reference index value Th2 as the second index value (S44: YES), the channel selection unit 24 performs the following processing. That is, the channel selection unit 24 reselects a channel to be used from a plurality of channels based on the communication quality information. According to the above configuration, deterioration of communication quality can be prevented.

The wireless communication device 8a further includes an index value measurement unit 12 that measures the RSSI of the currently used channel at the current location. The channel selector 24 performs the following processing even when the RSSI of the currently used channel at the current location is worse than the reference index value Th3 as the third index value. That is, when the RSSI of the currently used channel at the next passing point is better than the reference index value Th2 as the fourth index value (S44: NO), the channel selection unit 24 performs the following processing. . That is, the channel selection unit 24 continues to select the currently used channel. According to the above configuration, since excessive channel switching can be prevented, deterioration of communication quality caused by channel switching can be avoided.

Also, the communication quality index value is at least one of RSSI (Received Signal Strength Indicator) and BER (bit error rate).

Also, the distance between the points P1 to P5 corresponds to the density of buildings at each point. According to the above configuration, it is possible to frequently switch channels as necessary in an area where local deterioration of communication quality is expected. Therefore, high communication quality can be maintained even when moving through an area where local deterioration of communication quality is expected.

Also, the wireless communication method by the wireless communication device 8a includes a channel selection step (S27) and communication steps (S34, S36). In the channel selection step (S27), a channel to be used is selected from a plurality of channels based on communication quality information that associates a plurality of channels with an index value indicating communication quality thereof for each of a plurality of points. In the communication step (S34, S36), communication is performed using the channel selected in the channel selection step (S27). According to the above method, the communication quality in wireless communication can be improved.

In the above examples, the programs can be stored and delivered to computers using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (eg, floppy disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks). Examples of non-transitory computer-readable media further include CD-ROM (Read Only Memory), CD-R, CD-R/W, semiconductor memory (eg, mask ROM). Examples further include PROM (Programmable ROM), EPROM (Erasable PROM), Flash ROM, RAM (random access memory). The program may also be delivered to the computer on various types of transitory computer readable medium. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. Transitory computer-readable media can deliver the program to the computer via wired channels, such as wires and optical fibers, or wireless channels.

Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above. 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 invention.

This application claims priority based on Japanese Patent Application No. 2019-034985 filed on February 27, 2019, and the entire disclosure thereof is incorporated herein.

1 wireless communication device 2 communication quality information storage unit 3 channel selection unit 4 communication unit

Claims (9)

communication quality information storage means for storing communication quality information that associates a plurality of channels with an index value indicating communication quality thereof for each of a plurality of points;
channel selection means for selecting a channel to be used from the plurality of channels based on the communication quality information;
a communication means for communicating using the channel selected by the channel selection means;
index value measuring means for measuring the index value of the currently used channel at the current location;
with
The channel selection means selects a channel to be used from the plurality of channels based on the communication quality information when the index value of the currently used channel at the point to be passed in the future is worse than the second index value. fix,
wireless communication device. The channel selection means selects a channel to be used from the plurality of channels based on an index value at a point to be passed in the future.
A wireless communication device according to claim 1 . The channel selection means selects the channel corresponding to the best index value at the point to be passed in the future.
The radio communication device according to claim 2. further comprising index value measuring means for measuring index values of a plurality of channels at the current location;
When the index value at the current location of the channel corresponding to the best index value at the point to be passed in the future is worse than the first index value, the channel selection means selects the plurality of channels based on the index values of the plurality of channels at the current location. select the channel to use from the channels,
The radio communication device according to claim 3. The channel selection means is configured so that even if the index value of the currently used channel at the current location is worse than the third index value, the index value of the currently used channel at the point to be passed in the future is lower than the fourth index value. If good, continue to select the channel you are currently using,
A wireless communication device according to claim 1 . The communication quality indicator value is at least one of RSSI (Received Signal Strength Indicator) or BER (bit error rate),
The radio communication device according to any one of claims 1 to 5. communication quality information storage means for storing communication quality information that associates a plurality of channels with an index value indicating communication quality thereof for each of a plurality of points;
channel selection means for selecting a channel to be used from the plurality of channels based on the communication quality information;
a communication means for communicating using the channel selected by the channel selection means;
with
The distance between the plurality of points corresponds to the density of buildings at each point,
wireless communication device. a channel selection step of selecting a channel to be used from the plurality of channels based on communication quality information that associates a plurality of channels with an index value indicating communication quality thereof for each of a plurality of points;
a communication step of communicating using the channel selected in the channel selection step;
an index value measuring step of measuring the index value of the currently used channel at the current location;
including
In the channel selection step, if the index value of the currently used channel at the point to be passed in the future is worse than the second index value, the channel to be used is selected from the plurality of channels based on the communication quality information. fix,
wireless communication method. A program for causing a computer to execute the wireless communication method according to claim 8 .

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