WO2023021898A1

WO2023021898A1 - Communication path selection method and local edge network communication system

Info

Publication number: WO2023021898A1
Application number: PCT/JP2022/027764
Authority: WO
Inventors: 直樹山内; 博司宮田; 和民有本; 憲昭吉川; 博英三上; 耕太郎新庄; 隆之鈴木
Original assignee: 株式会社テクノアクセルネットワークス; 株式会社サイバー創研; 株式会社高速屋; ＤｅｎｄｒｉｔｉｋＤｅｓｉｇｎ株式会社
Priority date: 2021-08-18
Filing date: 2022-07-14
Publication date: 2023-02-23
Also published as: JP2023028073A

Abstract

The present invention provides a method for selecting a communication path for communication performed between two mobile bodies in a network including a base station and a plurality of mobile bodies, the method comprising: a communication speed acquiring step for acquiring first communication speed estimate data between a transmitting mobile body which is one of the two mobile bodies that is on the data-transmitting side and the base station, second communication speed estimate data between a receiving mobile body which is one of the two mobile bodies that is on the data-receiving side and the base station, and third communication speed estimate data between the transmitting mobile body and the receiving mobile body; a transmission data amount acquiring step for acquiring a transmission data amount of transmission data transmitted by the transmitting mobile body; and a communication path selecting step for selecting, on the basis of the first communication speed estimate data through the third communication speed estimate data and the transmission data amount acquired in the communication speed acquiring step and the transmission data amount acquiring step, one of a first communication path that passes through the base station and a second communication path that does not pass through the base station, as a communication path from the transmitting mobile body to the receiving mobile body.

Description

Communication path selection method and communication system for local edge network

The present invention relates to a communication path selection method and a communication system for local edge networks.

In recent years, safe driving of vehicles and automated driving support have been put into practical use, and the development of automated driving is also progressing. In these systems, for example, high-precision map information required for the system is distributed from the cloud to the vehicle via a communication base station, so the system is realized as a communication system that combines an in-vehicle computer and communication.

In terms of safe driving, automated driving support, or automated driving, for example, static map data for car navigation systems that have been collected, edited, and distributed once every several months to several years by vehicles dedicated to data collection, can be used for advanced safe driving. Data called a dynamic map is used, which superimposes continuously changing information such as surrounding vehicles, pedestrian and signal information, accident information, and traffic control information necessary for support and automatic driving.

In the dynamic data obtained in this way, there is a lot of information that changes sequentially, so it is easy to need to share information with other moving objects in a short period of time. When sharing information with other mobiles, it is necessary to efficiently search for the information to be shared and other mobiles having the information, and acquire the information.

For example, a search method using an answer accumulation device has been proposed as a method of efficiently searching database resources distributed over a network and efficiently searching for necessary data without imposing a heavy load on the network or database ( See JP-A-2000-235583). In the above search method, first, a search process is performed on a database located in a narrow area, and the answer data accumulated in the answer accumulation device, that is, the number of effective information is counted by the answer counter. When it is determined that a predetermined number of response data cannot be obtained from this narrow area, a wider range is searched from the search device via the communication device.

JP-A-2000-235583

In the search method using the above-mentioned conventional response accumulation device, if the search target data does not exist in a narrow area, the information will be obtained by searching in a wider area, requiring a search via the network. As the number of searches through the network increases, the network load increases, communication congestion tends to occur, and the time required for searches and information acquisition increases dramatically. For this reason, it cannot be said that the above-described conventional method can stably and efficiently perform search and information acquisition.

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and provides a communication route selection method and a communication system for a local edge network that can reduce communication congestion and share information with other mobile units in a short time. for the purpose.

A communication route selection method according to one aspect of the present invention is a communication route selection method for communication between two mobile units in a network including a base station and a plurality of mobile units that are mutually connected via a common wireless interface. the first communication speed estimation data between the transmitting mobile, which is the data transmitting side of the two mobiles, and the base station; and the receiving mobile, which is the data receiving side of the two mobiles. a communication speed obtaining step of obtaining second communication speed estimation data with the base station and third communication speed estimation data between the transmitting mobile unit and the receiving mobile unit; a transmission data amount obtaining step of obtaining the transmission data amount of the transmission data; a communication route selection step of selecting either a first communication route passing through the base station or a second communication route not passing through the base station as a communication route from the transmitting mobile unit to the receiving mobile unit based on the and

A communication system for a local edge network according to another aspect of the present invention is a communication system for a local edge network including a base station and a plurality of mobiles, and is a communication path for communication between two mobiles in the network. As a selection method, the communication route selection method of the present invention is used.

The communication route selection method and local edge network communication system of the present invention can reduce communication congestion and share information with other mobile units in a short time.

FIG. 1 is a flow diagram showing a communication route selection method according to one embodiment of the present invention. FIG. 2 is a schematic configuration diagram showing a communication system for a local edge network using the communication route selection method of FIG. FIG. 3 is an image diagram showing map data corresponding to a road network. 4 is a schematic data diagram showing an example of a local master table in the local edge network communication system of FIG. 2. FIG. FIG. 5 is a schematic diagram for explaining a communication heat map. FIG. 6 shows an example of a communication heat map centered on base stations. FIG. 7 shows an example of a communication heat map centered on receiving mobiles.

[Description of the embodiment of the present invention]
First, embodiments of the present invention will be listed and described.

In this communication route selection method, speed estimation data between mobile units and between a mobile unit and a base station is obtained according to the constantly changing position of the mobile unit, and a communication route is selected in consideration of the amount of transmission data. Therefore, it is possible to reduce the time required for data communication. In addition, in the communication path selection method, direct communication between mobile units is used to reduce communication congestion that tends to concentrate on base stations, so that the communication speed of the entire network can be improved.

In the communication route selection step, a first communication time predicted when the first communication route is selected and a second communication time predicted when the second communication route is selected are calculated; If the communication time is equal to or shorter than the predetermined allowable time, the second communication route should be selected. By selecting the second communication path when the second communication time is equal to or less than the predetermined allowable time, it is possible to further reduce communication congestion that tends to concentrate on the base station, thereby further increasing the communication speed of the entire network. can be improved.

It is preferable to further include a communication stop determination step of determining to stop transmission of the transmission data when the first communication time and the second communication time exceed the allowable time. If the communication time exceeds the allowable time, even if the transmission data is received, it may become unnecessary data. By determining to suspend communication with respect to such transmission data through the communication suspension determination step and suspending communication, the total amount of data communicated over the entire network can be reduced, and the communication speed of the entire network can be further improved. .

The base station and the plurality of mobile bodies each have a database, the mobile body has a sensor, and the sensor information acquired by the sensor is arranged in the mobile body having the sensor. A database has a local master table stored as registration data of the database, the database includes information specifying a database in which the registration data exists in the network to which the database belongs, and the local master table stores the registration data. It is preferable to include data attributes, data size and acquisition time. By constructing the database in this way, it is possible to acquire the data necessary for the communication path selection process with a relatively small amount of data, thereby reducing the total amount of data communicated over the entire network and increasing the communication speed of the entire network. It can be improved further.

The allowable time should be determined based on the attributes of the registered data. The valid time of the data differs depending on the attribute of the registration data. Therefore, by determining the permissible time based on the attribute of the registration data, more efficient communication can be performed.

Either one or both of the effective life and redundancy of the above registration data should be defined. As the registration data increases, the amount of data in the local master table relating to this registration data also increases. By defining the effective life of the registration data, it becomes possible to delete the registration data that has exceeded the effective life. In addition, there are cases where a plurality of moving bodies obtains sensor information from the same information source and becomes registered data. By determining the degree of redundancy for such registered data, the amount of data in the overlapping portion can be reduced. Therefore, by determining one or both of the effective life and redundancy of the registration data, it is possible to prevent the data volume of the local master table and the entire database from becoming bloated.

Since the local edge network communication system uses the communication route selection method of the present invention, it can share information with other mobile units in a short period of time.

[Details of the embodiment of the present invention]
Hereinafter, a communication path selection method and a communication system for a local edge network according to embodiments of the present invention will be described with appropriate reference to the drawings.

The communication route selection method shown in FIG. 1 is a communication route selection method for communication between two mobile units in a network including a base station and a plurality of mobile units that are mutually connected by a common wireless interface. It includes a target determination step S1, a communication speed acquisition step S2, a transmission data amount acquisition step S3, a communication route selection step S4, a communication stop determination step S5, and a communication processing step S6.

[Communication system for local edge network]
The communication route selection method is used in the local edge network communication system 1 shown in FIG. That is, the local edge network communication system 1 is a local edge network communication system including a base station 10 and a plurality of mobile units 20, and a communication route selection method for communication between two mobile units 20 in the network. , the communication route selection method of the present invention is used.

The base station 10 and multiple mobile units 20 are connected via a wireless interface. As the wireless interface, 5G, local 5G, 4G, DSRC (Dedicated Short Range Communications), LPWA (Low Power Wide Area), WiFi, IEEE802.11 series, ITS (Intelligent Transport System) communication interface, etc. can be used. can.

Also, the base station 10 and the plurality of mobile units 20 are connected to each other via a common wireless interface. That is, the base station 10 and the plurality of mobile units 20 can communicate directly between any two parties.

<Base station>
The base station 10 is a base station that supervises and controls the geographical range in which wireless communication of the local edge network communication system 1 can be performed. Specifically, the base station 10 performs data management processing and distribution control processing for a plurality of mobile units 20, for example.

When the geographical range is wide, the base station 10 includes a main base station that supervises and controls the entire geographical range, and a base station 10 that belongs to the lower layer of the main base station and subdivides the geographical range supervised by the main base station. It may also have a local base station that integrates and supervises.

<Moving body>
A plurality of mobile units 20 are devices that move within a data sharing area (geographical range in which wireless communication can be performed) managed by the local edge network communication system 1 .

A plurality of moving bodies 20 may include vehicles, drones, mobile robots, portable devices, bicycles, and the like. Among them, the moving body 20 may include a vehicle. The local edge network communication system 1 can be particularly suitably used for a system including vehicles, for example, a V2X communication system used for automatic driving or MaaS business. "V2X" is an abbreviation for "Vehicle to X", and is a generic term for technology that connects and mutually cooperates between a vehicle and something (other vehicles, pedestrians, infrastructure, networks, etc.). This V2X is essential, for example, for autonomous driving of vehicles. Although the following description is based on the premise that the mobile object 20 includes a vehicle, this does not mean that the local edge network communication system 1 has a vehicle as an essential component of the mobile object 20 .

<Database>
The base station 10 and multiple mobile units 20 each have a database 30 . Further, the moving body 20 has a sensor 20a. Furthermore, the base station 10 may have sensors. A "sensor" is an element or device that detects a phenomenon in the real world and converts the detected phenomenon into a signal that can be processed by a computer.

The sensor information acquired by the sensor 20a is stored as registered data in the database 30 arranged in the mobile body 20 having this sensor 20a. The above information includes arbitrary natural phenomena such as weather and temperature, phenomena caused by man-made objects such as traffic congestion, human vital information such as heart rate, respiratory rate, and blood pressure, approach of people to vehicles, and traffic on the road. Any information that can be detected by a sensor, such as falling object information, time, moving speed, and position, can be used.

The database 30 has a data table 40 that stores registration data and a local master table 50 that contains information specifying the database 30 in the network to which the database 30 belongs.

In addition to storing registration data acquired by the sensor 20a, the data table 40 also stores registration data required by this moving body 20 and acquired from other moving bodies 20. On the other hand, registration data that has never been required by this mobile unit 20 is not registered. Therefore, looking at the data table 40 of one mobile unit 20, only part of the registration data existing in the local edge network communication system 1 is registered. Focusing on one piece of registration data, for example, registration data a, there may exist a data table 40 in which registration data a is registered and a data table 40 in which registration data a is not registered.

The local master table 50 includes attributes, data sizes, and acquisition times of registered data. A specific example of the local master table 50 will be described by taking as an example a case where the object of sensor information is "falling object". For information on "falling objects", it is preferable to perform labeling (road link, see FIG. 3) that links the data to the road, and update the information for each road link. For example, in FIG. 3, the moving object 20 (label V1) is traveling between a0 and a1 (road link a01). Note that sensor information other than falling objects can also be realized with a similar configuration.

Also, it is preferable that either one or both of the effective life and redundancy of the above registration data is defined. By defining either one or both of the effective life and redundancy of the registration data, it is possible to prevent the data volume of the local master table and the database as a whole from becoming bloated.

FIG. 6 is an example of the local master table 50 corresponding to this road link a01. In the local master table 50 of FIG. 6, the record R1 on the first line records information on the moving body 20 existing on the road link a01. That is, in record R1, the vehicle No. whose existence was confirmed at a01. , time and position are recorded. If there is a second moving object 20 on the road link a01, for example, as shown in FIG. 6, record R2 should be added to add information about this second moving object. On the other hand, for example, when the moving body 20 recorded in the record R1 moves to the road link a02 after the passage of time, the record R1 of the road link a01 is deleted, and instead the record of this moving body 20 is added to the road link a02. Added.

Since the records R1 and R2 in the first row are configured as described above, the current positions of the plurality of mobile units 20 existing in the local edge network communication system 1 can be estimated by referring to these records. can. This record may be updated, for example, at regular time intervals, or when the moving body 20 moves to another road link. It should be noted that it is not essential to include the information for acquiring the current positions of a plurality of moving bodies 20 in the local master table 50, and for example, the information may be managed by other methods such as centralized management by aggregating the information in the base station 10. .

Record R3 on the second line shows information on a fallen object found on road link a01. Since the information of the falling object is stored as registered data in the database 30, for example, as an image or moving image in the database 30 arranged in the moving body 20 that acquired the information of the falling object, it is associated with this information. stored as The "attribute" of the record R3 represents the attribute of the registered data, which is "falling object" in this case.

It is assumed that another moving object 20 passes through the road link a01 and finds the same fallen object. In such a case, it is preferable to determine the degree of duplication of the registration data. Specifically, if it is determined that the falling object is the same, the vehicle No. of the other moving body 20 is linked with the previous record R3. and the acquisition time should be added as a new record R4. In this case, the sensor information acquired by the other moving body 20 is replaced with the registration data of the previous record R3. Alternatively, conversely, the sensor information acquired by the other moving body 20 may be replaced with the latest information. On the other hand, if the object is moving or if the relative position of the other moving body 20 and the object is different, there is a high probability that they are the same (also simply referred to as “similar”), although they do not match perfectly. is sometimes judged to be In such a case, the registered data linked with the previous record R3 is registered in the data table 40 of the other moving body 20 and registered as a record R5 including data size, acquisition time, and the like. That is, in the local master table 50 of FIG. 6, two stages of "identical" and "similar" are defined and managed as the duplication degree. By determining the degree of duplication for registered data in this way, the amount of data in the duplicated portion can be reduced.

In addition, in the local edge network communication system 1, another mobile unit 20 may register the registration data obtained from this mobile unit 20. In such a case, a record R6 indicating that the registration data of the registered record R3 has been transmitted to another mobile unit 20 is provided, and the transmitting vehicle No. and the time should be recorded.

Since the records R3 to R5 on the second line are configured as described above, it is possible to specify the database 30 in the network in which the registration data exists. Further, by constructing the database 30 in this way, it is possible to acquire the data necessary in the communication path selection step S4 with a relatively small amount of data. Communication speed can be further improved.

Each time the local master table 50 is updated in one of the databases 30 or at regular time intervals, the updated information is aggregated in the local master table 50 of the base station 10, and the aggregated updated local master table is created. . When distributing the local master table 50, only the updated difference may be transmitted, or the entire local master table 50 may be transmitted.

When the effective life of registered data is determined, it is preferable to delete registered data whose elapsed time from the acquisition time exceeds the effective life at the timing of updating the local master table 50 or at a predetermined timing. As the registration data increases, the amount of data in the local master table 50 related to the registration data also increases. However, by setting the effective life of the registration data, it becomes possible to delete the registration data that has exceeded the effective life. It is preferable that the effective life is determined based on the attribute of the registration data. For example, the aforementioned "falling object" is highly likely to be removed after a predetermined period of time has elapsed. On the other hand, for example, a "pedestrian" has a high possibility of moving by itself, and the effectiveness of information decreases in a shorter period of time than a "falling object" (effective life is short). On the other hand, a "parked vehicle" may remain in place for a longer period of time, so the useful life is set longer. Which object is which can be associated with the attribute of the registration data, so by determining the effective life based on the attribute of the registration data, an appropriate effective life can be set.

[Communication route selection method]
Each step of the communication route selection method will be described. As a specific example, in the local edge network communication system 1 shown in FIG. 2, it is assumed that a mobile unit 20 (receiving mobile unit 21) in which the registration data a is not registered needs the registration data a.

<Communication target determination process>
In the communication target determination step S1, the receiving mobile unit 21 determines the mobile unit 20 (transmitting mobile unit 22) to receive the registration data a.

By referring to its own local master table 50, the receiving mobile 21 can identify which mobile 20 has the registration data a. If there are a plurality of moving bodies 20 having registration data a, one of the moving bodies 20 is selected. The method of selecting this mobile unit 20 is not particularly limited, but since the position of each mobile unit 20 can be identified by referring to its own local master table 50, for example, the mobile unit 20 closest to the receiving mobile unit 21 is selected. be able to. According to this technique, communication targets can be determined by referring only to the local master table 50 of itself, that is, communication via the network is not performed, so the total amount of data communicated over the entire network can be reduced.

At this time, if the degree of duplication of registered data is defined as in the local master table 50 shown in FIG. 6, for example, the greater the number of identical or similar data, the more reliable the data can be determined. Therefore, the receiving mobile unit 21 may determine the reliability of the registration data from the degree of duplication of the local master table 50, and determine the priority of the registration data to be obtained and whether or not to obtain the registration data according to the reliability. By judging the reliability of the registration data in this way, for example, it is possible to avoid receiving unnecessary registration data, so that the total amount of data communicated over the entire network can be reduced.

<Communication speed acquisition process>
In the communication speed acquisition step S2, the first communication speed estimation data between the transmitting mobile unit 22 of the two mobile units 20 that transmits data and the base station 10, and the data of the two mobile units 20 are obtained. Second communication speed estimation data between the receiving mobile unit 21 on the receiving side and the base station 10 and third communication speed estimation data between the transmitting mobile unit 22 and the receiving mobile unit 21 are obtained.

When transmitting and receiving data from the transmitting mobile unit 22 to the receiving mobile unit 21, there are two possible communication routes: a communication route via the base station 10 and a direct communication route. It is necessary to obtain the first communication speed estimation data, the second communication speed estimation data, and the third communication speed estimation data as information necessary for determining this communication path.

The first communication speed estimation data and the second communication speed estimation data regarding communication with the base station 10 can be obtained using a communication heat map centered on the base station 10. The communication heat map is a map (see FIG. 6) obtained by dividing the geographic range managed by the base station 10 shown in FIG.

In the above communication heat map, the size of one area is appropriately determined to a size that can be regarded as a constant communication speed, but can be, for example, 20 m or more and 100 m or less. Also, although the size of each area can be changed according to the communication speed, the size of each area can simply be the same. Also, in the example of FIG. 5, each region is partitioned into a square shape, but other partitioning methods may be employed. As other partitioning methods, for example, a method of partitioning concentrically around the base station 10, or a method of combining straight lines radially extending from the base station 10 and concentric circles can be adopted.

FIG. 6 is an example of a communication heat map centered on the base station 10. FIG. Such a heat map can be generated from, for example, the output of the base station 10, the antenna sensitivity of a plurality of mobile bodies 20, the simulation from three-dimensional geographical information such as buildings, etc., and the actual measurement values observed at a plurality of mobile bodies 20. can be calculated by complementing or combining them. In particular, when using actual measurements, the communication heat map may be updated at regular time intervals.

For example, in the communication heat map of FIG. 6, the first communication speed estimation data is 7 Mbps from the position of the transmitting mobile 22, and the second communication speed estimation data is 9 Mbps from the position of the receiving mobile 21.

Similarly, the third communication speed estimation data can be obtained from a communication heat map centered on the transmitting mobile unit 22, for example. FIG. 7 is an example of a communication heat map centered on the transmitting mobile unit 22. In FIG. Although the communication heat map can adopt a division method different from that of the communication heat map centered on the base station 10, it is preferable that the division method be the same. Moreover, it is preferable that the size of each region is the same. By using the same division method and size in this way, it is easy to achieve consistency between the communication heat maps.

For example, in the communication heat map of FIG. 7, the third communication speed estimation data from the position of the receiving mobile unit 21 is 6 Mbps.

<Transmission data amount acquisition process>
In the transmission data amount acquisition step S3, the transmission data amount of the transmission data transmitted by the transmitting mobile unit 22 is acquired.

By referring to its own local master table 50, the receiving mobile unit 21 can know the amount of registration data a to be received. Here, for example, the transmission data amount is assumed to be 1 MB.

<Communication route selection process>
In the communication path selection step S4, based on the first to third communication speed estimation data and the transmission data amount obtained in the communication speed obtaining step S2 and the transmission data amount obtaining step S3, data is received from the transmitting mobile unit 22. As the communication route to the mobile unit 21, either one of the first communication route passing through the base station 10 and the second communication route not passing through the base station 10 is selected.

In the communication path selection step S4, a first communication time predicted when the first communication path is selected and a second communication time predicted when the second communication path is selected are calculated.

The first communication time is the data transmission time from the transmitting mobile unit 22 to the base station 10 (=the transmission data amount/the first communication speed estimation data×8) and the data transmission time from the base station 10 to the receiving mobile unit 21. It is calculated as the sum of the transmission time (=the amount of transmission data/the second communication speed estimation data×8) and the data processing time at the base station 10 . Assuming that the data processing time at the base station 10 is 50 ms in the above case, the first communication time is calculated as follows: 1 MB/7 Mbps×8+1 MB/9 Mbps×8+0.05 s (50 ms)≈2.08 s.

On the other hand, the third communication time is calculated by the data transmission time from the transmitting mobile unit 22 to the receiving mobile unit 21 (=the transmission data amount/the third communication speed estimation data×8). In the above case, the third communication time is calculated as 1 MB/6 Mbps×8≈1.33 s.

There is also a method of simply selecting a communication route with a short communication time, but if the second communication time is less than or equal to a predetermined allowable time, the second communication route should be selected. For example, if the attribute of the registration data is "falling object", the moving body 20 heading for the position of the falling object generally needs the registration data "a" and thus becomes the receiving moving body 21. FIG. Since the position of the falling object can be obtained from the local master table 50, it is possible to calculate the time required for the receiving moving body 21 to reach the falling object. Assuming that the time is 10 seconds, if the reception of the registration data a is completed just before the receiving moving body 21 reaches the position of the falling object (for example, 8 seconds after 2 seconds before the arrival), this registration data a can be effectively used. That is, the allowable time is 8 seconds. If the second communication time is less than or equal to the predetermined allowable time, the second communication path is selected regardless of the communication time, thereby further reducing communication congestion that tends to concentrate on the base station 10. The overall communication speed can be further improved.

It is preferable that the allowable time is determined based on the attributes of the registration data. The valid time of the data differs depending on the attribute of the registration data. Therefore, by determining the permissible time based on the attribute of the registration data, more efficient communication can be performed. The permissible time may be predetermined as a fixed value according to the attribute, but for example, as in the case of the falling object described above, it is determined by a mathematical formula such as the arrival time to the falling object - 2 seconds. good too.

<Communication stop determination process>
In the communication stop determination step S5, when the first communication time and the second communication time exceed the allowable time, it is determined to stop the transmission of the transmission data. That is, when both the first communication time and the second communication time exceed the allowable time, the transmission of the transmission data is stopped.

It is conceivable that no matter which one of the first communication route and the second communication route is selected, the allowable time will be exceeded. When the communication time exceeds the allowable time in this manner, the transmitted data may become unnecessary data even if received. By determining to stop communication with respect to such transmission data in the communication stop determination step S5 and stopping the communication, the total amount of data communicated over the entire network can be reduced, and the communication speed of the entire network can be further improved. .

<Communication processing process>
In the communication processing step S6, the registered data a is transferred from the transmitting mobile unit 22 to the receiving mobile unit 21 through the communication route selected in the communication route selection step S4, except when it is determined in the communication stop determination step S5 that data transmission is stopped. Send.

Specifically, the receiving mobile unit 21 makes a communication request to the transmitting mobile unit 22 and, in some cases, the base station 10, performs a predetermined communication procedure, and receives new registration data a. The received registration data a is registered in the data table 40 of the receiving mobile unit 21 . Also, since the number of mobile units 20 having new registration data a increases, the local master table 50 is updated by adding that information (information corresponding to record R5 in FIG. 4). The updated local master table 50 is then shared by the base station 10 and multiple mobile units 20 .

〔advantage〕
In this communication route selection method, speed estimation data between the moving bodies 20 and between the moving bodies 20 and the base station 10 are acquired according to the positions of the moving bodies 20 that change from moment to moment. Since the communication path is selected, the time required for data communication can be reduced. In addition, in this communication route selection method, by using direct communication between the mobile units 20, it is possible to reduce communication congestion that tends to concentrate on the base station 10, so that the communication speed of the entire network can be improved. .

Since the local edge network communication system 1 uses the communication route selection method of the present invention, it can share information with other mobile units 20 in a short period of time.

[Other embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, in the above embodiment, the components of each part of the above embodiment can be omitted, replaced, or added based on the description of the present specification and common general technical knowledge, and all of them are interpreted as belonging to the scope of the present invention. should.

In the above embodiment, the case where the communication route selection method includes the communication stop determination process has been described, but the communication stop determination process is not an essential process and can be omitted. In a communication route selection method that does not include a communication stop determination step, data is always transmitted according to the communication route selected in the communication route selection step.

In the above embodiment, the case where the database has a local master table was explained, but the local master table is not an essential configuration. You can take a configuration that

In the above embodiment, the case where the communication route selection method includes the communication target determination process has been described, but the communication determination process is not an essential process and can be omitted. In this case, if there are a plurality of mobile units that store the required registration data, the communication route selection method can be applied to each mobile unit, and the fastest communication route can be selected. .

It should be noted that the number of receiving mobile units to which one transmitting mobile unit transmits is not limited to one in the present invention. That is, one transmitting mobile may transmit to multiple receiving mobiles at the same time. In this case, the communication route may be determined for each receiving mobile unit, or a representative receiving mobile unit (for example, the receiving mobile unit that is farthest from the transmitting mobile unit) may be determined and a common communication route may be determined. When the communication route is determined for each mobile unit, it is possible to select the optimum route for each receiving mobile unit. On the other hand, when a common communication path is defined, if the first communication path is selected, communication from the transmitting mobile unit to the base station can be made common, so the total amount of data communicated over the entire network can be reduced. The overall communication speed can be further improved.

As described above, the communication route selection method and local edge network communication system of the present invention can reduce communication congestion and share information with other mobile units in a short time.

1 Local Edge Network Communication System 10 Base Station 20 Mobile 20a Sensor 21 Receiving Mobile 22 Sending Mobile 30 Database 40 Data Table 50 Local Master Tables R1, R2, R3, R4, R5, R6 Records

Claims

A communication route selection method for communication between two mobiles in a network including a base station and a plurality of mobiles connected to each other via a common wireless interface,
First communication speed estimation data between a transmitting mobile unit that transmits data out of the two mobile units and the base station, and a receiving mobile unit that receives data out of the two mobile units and the base station a communication speed obtaining step of obtaining second communication speed estimation data with a station and third communication speed estimation data between the transmitting mobile unit and the receiving mobile unit;
a transmission data amount acquisition step of acquiring a transmission data amount of transmission data transmitted by the transmission mobile;
A communication route from the transmitting mobile unit to the receiving mobile unit based on the first to third communication speed estimation data and the transmission data amount obtained in the communication speed obtaining step and the transmission data amount obtaining step. and a communication route selection step of selecting either one of a first communication route passing through the base station and a second communication route not passing through the base station.
calculating, in the communication path selection step, a first communication time predicted when the first communication path is selected and a second communication time predicted when the second communication path is selected;
2. The communication route selection method according to claim 1, wherein the second communication route is selected when the second communication time is less than or equal to a predetermined allowable time.
3. The communication route selection method according to claim 2, further comprising a communication stop determination step of determining to stop transmission of the transmission data when the first communication time and the second communication time exceed the allowable time.
the base station and the plurality of mobiles each have a database;
The moving body has a sensor,
The sensor information acquired by the sensor is stored as registered data in the database in the database arranged in the moving body having the sensor,
The database has a local master table containing information identifying the database in the network to which the database belongs, where the registration data resides;
4. The communication route selection method according to claim 2, wherein said local master table contains attributes, data size and acquisition time of said registered data.
The communication route selection method according to claim 4, wherein the allowable time is determined based on the attribute of the registration data.
　The communication route selection method according to claim 4 or claim 5, wherein either one or both of the valid life and redundancy of the registration data are defined.
A communication system for a local edge network comprising a base station and a plurality of mobiles,
A communication system for a local edge network using the communication route selection method according to any one of claims 1 to 6 as a communication route selection method for communication between two mobile units in the network.