JP4346383B2 - Optimal route search system and intersection server - Google Patents

Description

  The present invention relates to an optimal route search system and an intersection server that search for an optimal route to a destination.

Conventional route search is performed to arrive at the destination at the earliest or shortest distance based on information provided by VICS (Vehicle Information and Communication System) that centrally manages the traffic information of vehicles. It was. The conventional route search technique as described above is disclosed in Patent Document 1 below.
JP 2002-250635 A (paragraphs 0003 to 0008)

  However, the technique disclosed in Patent Document 1 is intended only to arrive at the destination at the earliest or the shortest distance, and does not consider the person who drives the vehicle. There are many people who drive a vehicle, such as those who have just acquired a driver's license, those who enjoy driving, and those who have time. In the conventional route search that arrives at the destination quickly or in the shortest distance as before, there are cases where guidance is given via roads with many pedestrians or roads with many parked vehicles, and those who have just obtained a driver's license There is a problem that it is dangerous for people, and there is a problem that it is not enjoyable for those who enjoy driving because there are cases where it is guided through a road with few sightseeing spots and events.

  An object of the present invention is to solve the above problem, and to provide an optimal route search system and an intersection server that can perform a route search according to a person driving a vehicle.

  In order to achieve the above object, according to the present invention, the vehicle information includes user information that is user information and destination information that is a destination of the vehicle, and the current position of the vehicle and the object specified by the user. A vehicle-mounted information terminal mounted on the vehicle for transmitting search program information for searching for the optimal route of the vehicle from the ground to the destination, and a road used for searching for the optimal route of the vehicle And an intersection server that manages intersection information that is information around the intersection, and the intersection server is an optimum route search system having a communication function with the vehicle and the other intersection servers. From the specific server that is one of the intersection servers in the intersection server that has received the search program information from the vehicle information terminal to the destination Among the intersection servers including the intersection information used for searching for the optimum route, the intersection is included between the intersection server including the intersection information of the intersection that is finally reached in the search for the route to the destination. A server sequentially moves the search program information replicated by the intersection server to another intersection server, and when passing through the intersection server, acquires the intersection information that the intersection server has, When the route server is moved to the intersection server including the intersection information of the intersection that is finally reached in the route search, the specific server returns to the specific server, and the specific server acquires the intersection information acquired by the returned searched search program information and The optimum route is searched based on user information, and the information on the searched optimum route is used as the vehicle. Optimum route search system that transmits to the information terminal is provided.

  In the optimum route search system of the above invention, the specific server that has received the search program information from the vehicle information terminal receives the destination information included in the received search program information and the search program information. The destination information included in the information on the optimum route stored in the predetermined storage area of the specific server and searched based on the search program information received within a predetermined time in the past from the time point On the optimal route based on information for identifying the intersection server on the optimal route included in the information on the optimal route including the destination information determined to be the same. Requesting the intersection server to send the intersection information of the intersection server on the optimum route. It transmits the signal requesting information, the searching the optimal route based on the intersection information and the user information received on the basis of the transmission request information is a preferred embodiment of the present invention.

  According to the present invention, there is also an intersection server for managing intersection information, which is information about road intersections and information around the intersections, used for searching for the optimum route of the vehicle, and receiving means for receiving the information, Storage means for storing the intersection information including the address information of the intersection, user information that is information of the user of the vehicle, and destination information that is the destination of the vehicle, and the current position of the vehicle and the user Search program information received by the receiving means for searching for the optimal route of the vehicle from the designated destination to the destination, or the receiving means from an external intersection server which is the intersection server other than itself Attachment means for attaching the intersection information stored in the storage means to a copy of the search program information received via The destination information included in the search program information to which the intersection information is attached by means, or the destination information contained in a copy of the search program information to which the intersection information is attached by the attachment means is the intersection. A determination unit that determines whether or not a condition set in the address information included in the information is satisfied; and when the determination unit determines that the condition set in the address information is not satisfied, the attachment unit A copy of the search program information is generated based on the search program information to which the intersection information is attached, or based on the copy of the search program information to which the intersection information is attached by the attachment means. Generating means for generating a copy; and the search program information generated by the generating means When the transmission means for transmitting a copy of the information to the external intersection server other than the self and the determination means determine that the condition set in the address information is satisfied, the search for the optimum route is terminated, or the attachment means A copy of the search program information to which the intersection information is attached by means of the external intersection which is a transmission source of the copy of the search program information received by the reception means before the intersection information is attached by the attachment means Processing means for returning to the server, and search means for searching for an optimum route based on the intersection information and user information attached to a copy of the search program information returned from the external intersection server, the transmitting means An intersection server that transmits information on the optimum route searched by the search means to the vehicle is provided.

  In the intersection server of the above invention, the attachment means stores optimum route information, which is information of the optimum route searched by the search means, in the storage means, and the determination means is received by the receiving means. The destination information included in the search program information and the storage searched based on the search program information received by the receiving means within a predetermined time in the past from the time when the search program information was received When it is determined that the destination information included in the optimum route information stored in the means is the same, the transmission means includes the optimum route information including the destination information determined to be the same. Based on information identifying the external intersection server on the optimal route included in the external route server on the optimal route The transmission request information for requesting to transmit the intersection information of the intersection server is transmitted, and the search means is a response to the transmission request information received by the reception means. Searching for the optimum route based on information is a preferred aspect of the present invention.

  The optimal route search system and the intersection server of the present invention have the above-described configuration, and can perform a route search according to the person driving the vehicle.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of an optimum route search system according to an embodiment of the present invention. FIG. 2 is a diagram showing the configuration of the intersection server according to the embodiment of the present invention. FIG. 3 is a flowchart showing the optimum route search flow in the optimum route search system according to the embodiment of the present invention. FIG. 4 is a flowchart showing a flow of optimum route search in a specific server among the intersection servers according to the embodiment of the present invention. FIG. 5 is a flowchart showing the flow of the optimum route search in the intersection server according to the embodiment of the present invention.

  First, the configuration of the optimum route search system according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the optimal route search system includes an in-vehicle information terminal 10 and an intersection server 20. The in-vehicle information terminal 10 is mounted on the vehicle 11 and transmits search program information including user information that is user information of the vehicle 11 and destination information that is a destination of the vehicle. The in-vehicle information terminal 10 corresponds to, for example, a car navigation system. The in-vehicle information terminal 10 outputs the optimum route information received from the specific server 20a described later to the user of the vehicle 11. For example, it is output on the screen or by voice. User information includes user attributes such as the user's driving skill, driving frequency, name, age, address, etc., the user's situation that he wants to arrive quickly because he is in a hurry, and has enough time, etc. Say. The destination information is information on a place intended by the user, for example, latitude and longitude information, landmark information, and the like. User information and destination information are input to the in-vehicle information terminal 10 by the user. For example, the input may be performed using voice, a touch panel, a remote controller, or the like. The search program information refers to a program described to acquire intersection information described later and search for an optimum route based on the acquired intersection information, and corresponds to, for example, an agent. Note that communication between the vehicle information terminal 10 and an intersection server 20 described later is performed peer-to-peer using, for example, a wireless LAN or a mobile phone radio.

  The intersection server 20 has intersection information, which is information about road intersections and information around the intersections, used to search for the optimum route of the vehicle 11 to the destination 12. Here, the intersection information is, for example, the position of the intersection, address, number of lanes, presence / absence of right / left turn lane, signal type, manufacturer of the vehicle 11 existing around the intersection, vehicle type, taxi, bus, business vehicle, general vehicle, Types of motorcycles, conditions such as the number of vehicles per lane, conditions such as the number of pedestrians, traffic regulations, road construction, weather, road freezing conditions, traffic jams and pedestrian conditions and number of accidents by time Information. This intersection information is, for example, information obtained by communication or the like obtained from a fixed point camera or an in-vehicle camera, information obtained based on the communication status of a mobile phone or PDA (Personal Digital Assistance), and Information acquired based on the communication status of sensors such as AHS (Advanced cruise-assist Highway Systems) and DSRC (Dedicated Short Range Communication), and information acquired based on VICS, Web, and the like. The intersection server 20 may be installed for each intersection and may manage intersection information, or may manage intersection information of a plurality of intersections with one intersection server 20. Further, the intersection server 20 may not be installed near the intersection but may be installed in a remote place. In this case, an antenna or the like is installed near the intersection so that it can communicate with the intersection server 20 installed in a remote place. Communication between the intersection servers 20 is performed peer-to-peer using, for example, a LAN.

  Next, the configuration of the intersection server according to the embodiment of the present invention will be described with reference to FIG. As illustrated in FIG. 2, the intersection server 20 includes a reception unit 21, a storage unit 22, an attachment unit 23, a determination unit 24, a generation unit 25, a transmission unit 26, a processing unit 27, and a search unit 28. The receiving unit 21 receives search program information from the in-vehicle information terminal 10 and receives intersection information. The storage unit 22 stores intersection information, and stores optimum route information that is information on the optimum route searched by the search unit 28 described later. Here, the optimum route information refers to the intersection information of the intersection server 20 on the optimum route obtained when the optimum route is searched.

  The attachment unit 23 stores the search program information received by the reception unit 21 or a copy of the search program information received via the reception unit 21 from an external intersection server that is an intersection server 20 other than itself. Attach the intersection information stored in Further, the attachment unit 23 stores the optimum route information in the storage unit 22. Here, the timing of attaching the intersection information may be the time when the copy of the search program information is generated by the generation unit 25 described later. The determination unit 24 stores destination information included in the search program information to which the intersection information is attached by the attachment unit 23 or destination information included in a copy of the search program information to which the intersection information is attached by the attachment unit 23. It is determined whether or not the condition set in the address information included in the intersection information stored in the unit 22 is satisfied. Here, whether or not the destination information satisfies the condition set in the address information included in the intersection information is, for example, that the address of the destination 12 included in the destination information is a predetermined area from the address included in the address information. Say whether it is inside or not. The determination unit 24 also includes the destination information included in the search program information received by the reception unit 21 and the optimum information stored in the storage unit 22 for a predetermined period in the past from the time when the search program information is received. It is determined whether or not the destination information included in the route information is the same. Here, the past predetermined time refers to the past 10 minutes, for example.

  When the determination unit 24 determines that the condition set in the address information is not satisfied, the generation unit 25 generates a copy of the search program information based on the search program information to which the intersection information is attached by the attachment unit 23. Alternatively, based on the copy of the search program information to which the intersection information is attached by the attachment unit 23, a copy of the search program information, that is, a copy of the search program information is generated. Here, the production | generation part 25 produces | generates the copy of the search program information of the number which subtracted 1 from the number of the roads connected to the intersection contained in intersection information. This number of generations is due to the fact that in principle there is no reversal. The transmission unit 26 transmits a copy of the search program information generated by the generation unit 25 to an external intersection server other than itself. In addition, the optimal route information searched by the search unit 28 described later is transmitted to the in-vehicle information terminal 10 mounted on the vehicle 11. In addition, transmission request information for requesting the external intersection server included in the optimum route information stored in the storage unit 22 to transmit the intersection information of the external intersection server is transmitted.

  When the processing unit 27 determines that the condition set in the address information is satisfied by the determination unit 24, the processing unit 27 ends the search for the optimum route, or duplicates the search program information to which the intersection information is attached by the attachment unit 23. It returns to the external intersection server of the transmission source of the copy of the search program information received by the receiving unit 21. The search unit 28 searches for the optimum route based on the intersection information and user information attached to the copy of the search program information returned from the external intersection server. Alternatively, the optimum route is searched based on the intersection information and user information which are responses to the transmission request information received by the receiving unit 21. Depending on the content of the user information, the optimum route based on the intersection information that is a response to the transmission request information may not be adopted. In this case, for example, the search for the optimum route is performed again by executing step S403 and subsequent steps in FIG. You may do. The reception unit 21, the attachment unit 23, the determination unit 24, the generation unit 25, the transmission unit 26, the processing unit 27, and the search unit 28 correspond to, for example, a CPU, and the storage unit 22 corresponds to, for example, an HDD, ROM, or RAM. To do. These parts are connected by a bus line.

  Next, an optimum route search flow in the optimum route search system according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 3, the in-vehicle information terminal 10 transmits search program information to the specific server 20a (step S301). Here, the specific server 20 a refers to the intersection server 20 that has received the search program information from the in-vehicle information terminal 10 among the intersection servers 20. Therefore, the intersection server 20 can be the specific server 20a. The specific server 20a attaches the intersection information to the received search program information and generates a copy of the attached search program information, unless “Yes” is selected in step S402 or step S404 of FIG. 4 to be described later. Then, a copy of the search program information to which the generated intersection information of the specific server 20a is attached is transmitted to the intersection server 20b (step S302). A case corresponding to the selection of “Yes” will be described later with reference to FIG.

  The intersection server 20b attaches the intersection information of the intersection server 20b to the copy of the received search program information to which the intersection information of the specific server 20a is attached, and the search program to which the intersection information of the specific server 20a and the intersection server 20b is attached. Copy of information, that is, a copy of search program information to which the intersection information of specific server 20a and intersection server 20b is attached, and a search program to which the generated intersection information of specific server 20a and intersection server 20b is attached A copy of the information is transmitted to the intersection server 20c (step S303). In step S303, the intersection server 20b must make a determination as in step S503 of FIG. 5 described later. In this example, it is assumed that the determination is “No”. The case where “Yes” is determined will be described later with reference to FIG. The intersection server 20c searches for the optimum route based on the intersection information attached to the copy of the search program information and the user information, and returns information on the optimum route to the intersection server 20b (step S304). Here, the intersection server 20c attaches the intersection information of the intersection server 20c to the copy of the search program information to which the intersection information of the received specific server 20a and the intersection server 20b is attached without searching for the optimum route. You may make it return to the server 20b. Here, the processing such as step S304 is performed because the intersection server 20c receives the destination information included in the copy of the search program information attached with the received intersection information of the specific server 20a and the intersection server 20b. This is because it is determined whether or not the condition set in the address information included in the intersection information of 20c is satisfied, and it is determined that the condition is satisfied. That is, the processing corresponding to step S508 in FIG.

  The intersection server 20b returns information on the optimum route received from the intersection server 20c to the specific server 20a (step S305). The intersection server 20b may return a copy of the search program information attached with the intersection information of the specific server 20a and the intersection servers 20b and 20c received from the intersection server 20c to the specific server 20a. The specific server 20a evaluates the route based on the received information on the optimum route. The specific server 20a may evaluate the route based on the intersection information of the specific server 20a and the intersection servers 20b and 20c attached to the received copy of the search program information. Although not shown, the specific server 20a transmits a copy of the search program information to which the intersection information of the specific server 20a is attached to the intersection server 20 other than the intersection server 20b, and the intersection server 20b also transmits the intersection server 20c. A copy of the search program information attached with the intersection information of the specific server 20a and the intersection server 20b is transmitted to the other intersection server 20. Therefore, a copy of the search program information to which the information on the optimum route or the information on the intersection of the destination server 20 that has been sent is attached is returned from these destinations, and the optimum route information or the search program information sent back is returned. The specific server 20a evaluates the route based on the intersection information attached to the duplicate. The specific server 20a searches for the optimum route from the evaluation of these routes, and transmits the optimum route information to the in-vehicle information terminal 10 (step S306). Here, when evaluating the route, the specific server 20a performs evaluation based on the user information included in the copy of the search program information. For example, if the user information indicates that the driving skill of the user of the vehicle 11 is immature, the evaluation of the search for the route based on the intersection information including an intersection with many pedestrians, an intersection with many parked vehicles, an intersection with a narrow road width, etc. Lower. When searching for the optimum route to the destination 12, it is conceivable that not only the intersection server 20b but also a plurality of intersection servers 20 are routed from the specific server 20a to the intersection server 20c.

  Next, the optimal route search flow in the specific server among the intersection servers according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 4, the receiving unit 21 shown in FIG. 2 receives the search program information from the in-vehicle information terminal 10 (step S401). The determination unit 24 includes destination information included in the received search program information and destination information included in the optimum route information stored in the storage unit 22 for a predetermined past time from when the search program information is received. It is determined whether or not the location information is the same (step S402). If it is determined in step S402 that they are not the same, the attachment unit 23 attaches the intersection information stored in the storage unit 22 to the received search program information (step S403). The determination unit 24 determines whether or not the destination information included in the search program information satisfies the conditions set in the address information included in the intersection information (step S404).

  In step S404, when the determination unit 24 determines that the condition is not satisfied, the generation unit 25 generates a copy of the search program information to which the intersection information is attached (step S405). If the determination unit 24 determines that the condition is satisfied, the search for the optimum route is terminated. The transmission unit 26 transmits a copy of the search program information to which the generated intersection information is attached to an external intersection server other than itself (step S406). The receiving unit 21 receives a copy of the search program information to which the intersection information is attached from the external intersection server (step S407). The search unit 28 searches for the optimum route based on the intersection information and user information attached to the received copy of the search program information (step S408). Here, as described above, the search unit 28 evaluates each route based on the user information included in the copy of the search program information, and searches for the optimum route from the evaluated route.

  The transmission unit 26 transmits the optimum route information, which is information of the searched optimum route, to the in-vehicle information terminal 10 (step S409). In step S402, if the determination unit 24 determines that they are the same, the transmission unit 26 transmits the intersection information to the external intersection server included in the optimum route information stored in the storage unit 22. The transmission request information is transmitted (step S410). The receiving unit 21 receives intersection information that is a response to the transmission request information (step S411). The search unit 28 searches for the optimum route based on the received intersection information and user information (step S412), and step S409 is executed. Here, in step S412, depending on the content of the user information, the optimum route based on the intersection information that is a response to the transmission request information may not be adopted. In this case, for example, the steps after step S403 are executed again to obtain the optimum route. You may search for. If not adopted, for example, in the case of user information indicating that the driving skill of the user of the vehicle 11 is immature, the intersection information that is a response to the transmission request information is an intersection with many pedestrians, an intersection with many parked vehicles, and a narrow road width This is a case where information such as an intersection is included.

  Next, the flow of optimum route search in the intersection server according to the embodiment of the present invention will be described with reference to FIG. The explanation here is about the processing in the intersection server 20 that has not become the specific server 20a in the explanation of FIG. 4 described above. As shown in FIG. 5, the receiving unit 21 shown in FIG. 2 receives a copy of the search program information from the external intersection server (step S501). The attachment unit 23 attaches the intersection information stored in the storage unit 22 to the copy of the search program information (step S502). The determination unit 24 determines whether or not the destination information included in the copy of the search program information satisfies the conditions set in the address information included in the intersection information (step S503).

  When the determination unit 24 determines that the condition is not satisfied, the generation unit 25 generates a copy of the search program information, that is, a copy of the search program information, based on the copy of the search program information to which the intersection information is attached. (Step S504). The transmission unit 26 transmits a copy of the search program information to which the generated intersection information is attached to an external intersection server other than itself (step S505). The receiving unit 21 receives a copy of the search program information to which the intersection information returned from the external intersection server is attached (step S506). The search unit 28 searches for the optimum route based on the intersection information and user information attached to the received copy of the search program information (step S507). The transmission unit 26 returns the optimum route information to the external intersection server that has transmitted in step S501 (step S509). In step S503, when the determination unit 24 determines that the condition is satisfied, the search unit 28 searches for the optimum route based on the intersection information and user information attached to the copy of the search program information (step S508). . In step S508, the search unit 28 does not search for the optimum route, and the processing unit 27 returns a copy of the search program information to which the intersection information is attached to the external intersection server that has transmitted in step S501. Also good. Then, the specific server 20a searches for the optimum route based on the copy of the search program information to which the returned intersection information is attached and the user information.

  The optimal route search system and the intersection server according to the present invention can perform route search according to the person driving the vehicle, and thus are useful for an optimal route search system and an intersection server that search for the optimal route to the destination. is there.

It is a figure which shows the structure of the optimal route search system which concerns on embodiment of this invention. It is a figure which shows the structure of the intersection server which concerns on embodiment of this invention. It is a flowchart which shows the flow of the optimal route search in the optimal route search system which concerns on embodiment of this invention. It is a flowchart which shows the flow of the optimal route search in the specific server among the intersection servers which concern on embodiment of this invention. It is a flowchart which shows the flow of the optimal route search in the intersection server which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 In-vehicle information terminal 11 Vehicle 12 Destination 20, 20b, 20c Intersection server 20a Specific server 21 Receiving part (receiving means)
22 Storage unit (storage means)
23 Attachment (attachment means)
24 Judgment part (judgment means)
25 Generator (Generator)
26 Transmitter (transmission means)
27 Processing unit (processing means)
28 Search part (search means)

Claims (4)

Optimal route of the vehicle from the current position of the vehicle and the destination designated by the user to the destination, including user information that is user information of the vehicle and destination information that is the destination of the vehicle An in-vehicle information terminal mounted on the vehicle for transmitting search program information for searching
A plurality of intersection servers that manage road intersections and intersection information that is information around the intersections, which are used to search for the optimal route of the vehicle, and the intersection server includes the vehicle and the other intersections. An optimum route search system having a communication function with a server,
The intersection server including the intersection information used for searching for the optimum route from the specific server that is one of the intersection servers in the intersection server that has received the search program information from the vehicle information terminal to the destination. The intersection server includes the search program information duplicated by the intersection server in sequence until the intersection server that includes the intersection information of the intersection that is finally reached in the search for the route to the destination. The intersection including the intersection information of the intersection that is finally reached in the search for the route to the destination by moving to the intersection server and acquiring the intersection information of the intersection server when passing through the intersection server When the server is moved to the server, the server is returned to the specific server, and the specific server is replicated. Based on the intersection information and the user information retrieval program information is acquired by searching the optimum route, the optimum route search system for transmitting information of the searched the optimal route to the in-vehicle information terminal.   The specific server that has received the search program information from the vehicle information terminal receives the destination information included in the received search program information and a predetermined time in the past from the time when the search program information was received. When it is determined that the destination information included in the information on the optimum route stored in the predetermined storage area of the specific server searched based on the search program information is the same, Based on the information for identifying the intersection server on the optimum route included in the information on the optimum route including the destination information determined to be present, the optimum route for the intersection server on the optimum route is determined. Transmitting transmission request information for requesting to transmit the intersection information of the intersection server above, based on the transmission request information Optimum route search system according to claim 1 for retrieving the optimal route based on the intersection information and the user information received. An intersection server for managing intersection information, which is information about road intersections and information around the intersections, used to search for the optimal route of the vehicle,
Receiving means for receiving information;
Storage means for storing the intersection information including address information of the intersection;
Optimal route of the vehicle from the current position of the vehicle and the destination designated by the user to the destination, including user information which is information of the user of the vehicle and destination information which is a destination of the vehicle The storage means for the search program information received by the receiving means for searching for or a copy of the search program information received from the external intersection server which is the intersection server other than itself via the receiving means Attachment means for attaching the intersection information stored in
The destination information included in the search program information to which the intersection information is attached by the attachment means, or the destination information included in a copy of the search program information to which the intersection information is attached by the attachment means, Determining means for determining whether or not a condition set in the address information included in the intersection information is satisfied;
If it is determined by the determination means that the condition set in the address information is not satisfied, a copy of the search program information is generated based on the search program information to which the intersection information is attached by the attachment means, or Generating means for generating a copy of the search program information based on a copy of the search program information to which the intersection information is attached by the attachment means;
Transmitting means for transmitting a copy of the search program information generated by the generating means to the external intersection server other than the self;
When it is determined by the determining means that the conditions set in the address information are satisfied, the search for the optimum route is terminated, or a copy of the search program information to which the intersection information is attached by the attaching means is attached. Processing means for returning to the external intersection server, which is a transmission source of a copy of the search program information received by the receiving means before the intersection information is attached by means;
Search means for searching for an optimum route based on the intersection information and user information attached to a copy of the search program information returned from the external intersection server,
An intersection server, wherein the transmission means transmits information on the optimum route searched by the search means to the vehicle. The attachment means stores in the storage means optimum route information that is information on the optimum route searched by the search means;
The destination information included in the search program information received by the receiving means and the search received by the receiving means within a predetermined time in the past from the time when the search program information is received. When it is determined that the destination information included in the optimum route information stored in the storage means, which is searched based on program information, is the same,
The transmission means, based on information identifying the external intersection server on the optimal route included in the optimal route information including the destination information determined to be the same, an external intersection on the optimal route Sending transmission request information for requesting the server to send the intersection information of the external intersection server;
The intersection server according to claim 3, wherein the retrieval unit retrieves an optimal route based on the intersection information and the user information that are responses to the transmission request information received by the reception unit.

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