DESCRIPTION
FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10, rule 13)
1. Title of the Invention:
“APPLICATION SERVER, BASE STATION, DYNAMIC MAP
DELIVERY SYSTEM, CONTROL CIRCUIT, AND INFORMATION
DELIVERY METHOD”
2. APPLICANT (S) –
(a) Name : MITSUBISHI ELECTRIC CORPORATION
(b) Nationality : Japanese Corporation
(c)Address : 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo
1008310, Japan.
The following specification particularly describes the invention and the manner
in which it is to be performed.
2
Field
[0001] The present disclosure relates to an application server, a base station, a
dynamic map delivery system, a control circuit, a storage medium, and an
5 information delivery method for delivering a dynamic map.
Background
[0002] There is a system in which a data delivery system delivers a dynamic
map as a V2X application to a vehicle that implements automated driving under a
10 specific condition (Level 2 automated driving) so as to implement fully automated
driving under a specific condition (Level 4 automated driving). The dynamic map
is a digital map in which dynamic information such as movement of persons and
semi-static information such as construction information are overlaid on static
information such as a three-dimensional map including lanes, structures, and the
15 like. The level of automated driving can be raised by delivering the dynamic map,
which is important for determining the driving policy, to the vehicle.
[0003] A bottleneck in maintaining the performance of Level 4 automated
driving is the communication quality between the vehicle to which the dynamic
map is delivered and the network or the communication quality between the vehicle
20 to which the dynamic map is delivered and the roadside unit. Therefore, standards
for 5th Generation (5G) mobile communication systems specify that deterioration
in communication quality is avoided by constantly setting up redundant sessions.
[0004] In addition, 5G standards also consider situations in which redundant
sessions cannot be set up due to the influence of the communication environment,
25 vehicle capacity, and the like, specifying that communication interruption or
fallback operation is performed in situations in which redundant sessions cannot be
set up. When a vehicle performs base station switching by handover under the
environment of communication interruption or fallback operation, continued
delivery of the dynamic map to the vehicle causes a loss of delivery information,
30 which greatly affects the performance of the automated driving.
[0005] For this reason, in the communication control system of Patent
Literature 1, the vehicle communication device calculates the handover timing for
3
base station switching based on the level of signals received from base stations.
Then, the vehicle control device lowers the service level of travel assistance control
based on the handover timing.
5 Citation List
Patent Literature
[0006] Patent Literature 1: Japanese Patent Application Laid-open No. 2014-
044639
10 Summary
Technical Problem
[0007] However, with the technique of Patent Literature 1, although the
handover timing can be estimated, the vehicle cannot receive the dynamic map at
the handover timing. This is problematic in that the vehicle cannot update the
15 dynamic map under fallback operation and has to lower the level of automated
driving.
[0008] The present disclosure has been made in view of the above, and an
object thereof is to obtain an application server capable of executing base station
switching by handover without lowering the level of automated driving even under
20 fallback operation.
Solution to Problem
[0009] In order to solve the above-described problems and achieve the object,
an application server according to the present disclosure delivers dynamic map
25 information to a first mobile object that receives the dynamic map information, the
dynamic map information being information of a dynamic map that is used for
execution of fully automated driving under a specific condition. When the first
mobile object executes a handover from a first base station capable of transmitting
the dynamic map information in a first area to a second base station capable of
30 transmitting the dynamic map information in a second area, in a case where the first
mobile object is in fallback operation in which simultaneous communication with
the first base station and the second base station is unavailable, the application
4
server delivers the dynamic map information to the first mobile object via the first
base station and a communication device capable of receiving the dynamic map
information from the first base station.
5 Advantageous Effects of Invention
[0010] The application server according to the present disclosure can achieve
the effect of executing base station switching by handover without lowering the
level of automated driving even under fallback operation.
10 Brief Description of Drawings
[0011] FIG. 1 is a diagram illustrating a configuration of a dynamic map
delivery system according to a first embodiment.
FIG. 2 is a sequence diagram illustrating a procedure for delivering dynamic
map information by the dynamic map delivery system according to the first
15 embodiment.
FIG. 3 is a diagram illustrating a configuration of a dynamic map delivery
system according to a third embodiment.
FIG. 4 is a sequence diagram illustrating a procedure for delivering dynamic
map information by the dynamic map delivery system according to the third
20 embodiment.
FIG. 5 is a sequence diagram illustrating a procedure for delivering dynamic
map information by a dynamic map delivery system according to a fourth
embodiment.
FIG. 6 is a diagram illustrating a configuration of a dynamic map delivery
25 system according to a fifth embodiment.
FIG. 7 is a sequence diagram illustrating a procedure for delivering dynamic
map information by the dynamic map delivery system according to the fifth
embodiment.
FIG. 8 is a diagram illustrating an exemplary configuration of processing
30 circuitry in the case that the processing circuitry provided in the application server
according to the first to fifth embodiments is implemented by a processor and a
memory.
5
FIG. 9 is a diagram illustrating an example of processing circuitry in the case
that the processing circuitry provided in the application server according to the first
to fifth embodiments is implemented by dedicated hardware.
5 Description of Embodiments
[0012] Hereinafter, an application server, a base station, a dynamic map
delivery system, a control circuit, a storage medium, and an information delivery
method according to embodiments of the present disclosure will be described in
detail with reference to the drawings.
10 [0013] First Embodiment.
FIG. 1 is a diagram illustrating a configuration of a dynamic map delivery
system according to the first embodiment. The dynamic map delivery system 1
includes an application server 10, base stations 20a and 20b, and mobile objects
30x and 30y. An example of the mobile objects 30x and 30y is a communication
15 terminal that is installed in a vehicle or the like, that is, a mobile communication
device.
[0014] • Application server 10
The application server 10 is a server that stores application data including
dynamic map information, i.e. information of a dynamic map. The dynamic map
20 information is information that is provided to the mobile objects 30x and 30y. The
application server 10 delivers the dynamic map information to the mobile object
30x via the base station 20a or the base station 20b.
[0015] The dynamic map information includes static information that is
information of a three-dimensional map such as the position of road surfaces, the
25 position of lanes, and the position of buildings. The dynamic map information
also includes semi-static information such as a schedule of traffic regulations, a
schedule of road construction, and weather information. The dynamic map
information also includes semi-dynamic information such as information on
accidents, information on traffic jams, and information on traffic regulations. The
30 dynamic map information also includes dynamic information such as movement of
persons. The application server 10 stores the dynamic map information in which
the static information, the semi-static information, the semi-dynamic information,
6
and the dynamic information are combined.
[0016] The application server 10 delivers the dynamic map information to the
mobile objects 30x and 30y in accordance with the timing at which the mobile
objects 30x and 30y update the dynamic map information. The application server
5 10 may be disposed in any way in the dynamic map delivery system 1. For
example, the application server 10 may be disposed ahead of the core network for
communication, or may be disposed immediately below the base stations 20a and
20b. In addition, the application server 10 may be installed at distributed locations
according to the update frequency of delivery data such as the dynamic map
10 information.
[0017] • Base stations 20a and 20b
The base stations 20a and 20b are communication base stations that deliver
delivery data such as the dynamic map information to users (in the first embodiment,
the mobile objects 30x and 30y) designated by the application server 10.
15 [0018] The base station 20a can transmit the dynamic map information to the
mobile objects 30x and 30y in a first area. The base station 20b can transmit the
dynamic map information to the mobile objects 30x and 30y in a second area. The
base station 20a is a first base station, and the base station 20b is a second base
station. The first area and the second area partially overlap, and handover can be
20 executed in the overlapping area.
[0019] Either the base station 20a or the base station 20b can connect to the
mobile object 30x at a specific timing and provide the service of delivering delivery
data such as the dynamic map information. During the fallback operation of the
mobile object 30x, the base stations 20a and 20b are never simultaneously
25 connected to the mobile object 30x. When the mobile object 30x in the fallback
operation performs a handover, the base stations 20a and 20b undergo an
instantaneous interruption of communication with the mobile object 30x.
[0020] Similarly, either the base station 20a or the base station 20b can connect
to the mobile object 30y at a specific timing and provide the service of delivering
30 delivery data such as the dynamic map information. During the fallback operation
of the mobile object 30y, the base stations 20a and 20b are never simultaneously
connected to the mobile object 30y. When the mobile object 30y in the fallback
7
operation performs a handover, the base stations 20a and 20b undergo an
instantaneous interruption of communication with the mobile object 30y.
[0021] • Mobile object 30x
The mobile object 30x includes a mobile communication unit 300x capable of
5 executing communication with the base stations 20a and 20b. In addition, the
mobile object 30x includes a sidelink communication unit 301x capable of
executing sidelink communication with a nearby mobile object (here, the mobile
object 30y) or a roadside unit (not illustrated). Note that the following description
refers to a case where the sidelink communication unit 301x of the mobile object
10 30x executes communication processing with the mobile object 30y.
[0022] In the mobile object 30x, the mobile communication unit 300x acquires
the dynamic map information from the application server 10 via the base station
20a or 20b. FIG. 1 illustrates a situation in which the mobile communication unit
300x is connected to the base station 20a and is about to perform a handover to the
15 base station 20b.
[0023] The mobile communication unit 300x of the mobile object 30x cannot
be connected to a plurality of base stations simultaneously during fallback operation.
The term “fallback operation” as used herein refers to an operation in which the
mobile object 30x continues operational processing while executing restrictions on
20 processing speed, some functions, and the like.
[0024] When performing a handover during fallback operation, the mobile
communication unit 300x is for a moment not connected to either the base station
20a or the base station 20b. When the mobile object 30x performs a handover
during fallback operation, a sidelink communication unit 301y to be described later
25 transmits the dynamic map information to the mobile object 30x. As a result, the
sidelink communication unit 301x acquires the dynamic map information via the
mobile object 30y, and the mobile object 30x executes Level 4 automated driving.
[0025] The first embodiment describes a case where the mobile object 30x
acquires the dynamic map information from the application server 10 via the mobile
30 object 30y during the handover, but the mobile object 30x may acquire the dynamic
map information from the application server 10 via another communication device.
For example, the mobile object 30x may acquire the dynamic map information from
8
the application server 10 via a roadside unit having a function similar to that of the
mobile object 30y.
[0026] • Mobile object 30y
The mobile object 30y has a function similar to that of the mobile object 30x.
5 The mobile object 30y includes a mobile communication unit 300y capable of
executing communication with the base stations 20a and 20b. In addition, the
mobile object 30y includes the sidelink communication unit 301y capable of
executing sidelink communication with a nearby mobile object (here, the mobile
object 30x) or a roadside unit (not illustrated). Note that the following description
10 refers to a case where the sidelink communication unit 301y of the mobile object
30y executes communication processing with the mobile object 30x.
[0027] In the mobile object 30y, the mobile communication unit 300y acquires
the dynamic map information from the application server 10 via the base station
20a or 20b. FIG. 1 illustrates a situation in which the mobile communication unit
15 300y is connected to the base station 20a and is capable of receiving the dynamic
map information from the application server 10.
[0028] The mobile communication unit 300y of the mobile object 30y cannot
be connected to a plurality of base stations simultaneously during fallback operation.
Therefore, when performing a handover during fallback operation, the mobile
20 communication unit 300y is for a moment not connected to either the base station
20a or the base station 20b. When the mobile object 30y performs a handover
during fallback operation, the sidelink communication unit 301x transmits the
dynamic map information to the mobile object 30y. As a result, the sidelink
communication unit 301y acquires the dynamic map information via the mobile
25 object 30x, and the mobile object 30y executes Level 4 automated driving.
[0029] The mobile object 30x is a first mobile object, and the mobile object
30y is a communication device. The communication device is a second mobile
object or a roadside unit. Note that the first embodiment assumes that there is no
timing at which the mobile object 30y is disconnected from the base station 20a
30 until the mobile object 30x completes the handover.
[0030] Next, processing for delivering dynamic map information in the
dynamic map delivery system 1 will be described. FIG. 2 is a sequence diagram
9
illustrating a procedure for delivering dynamic map information by the dynamic
map delivery system according to the first embodiment.
[0031] FIG. 2 illustrates an operational flowchart for a data
transmission/reception process that is executed among the application server 10, the
5 base stations 20a and 20b, and the mobile objects 30x and 30y. The following
section describes a case where the mobile object 30x moves from an area where
communication with the base station 20a is possible to an area where
communication with the base station 20b is possible.
[0032] Note that in some parts in FIG. 2, the mobile object 30x is denoted by
10 “30x” and the mobile object 30y is denoted by “30y”. For example, indicates that the destination is the mobile object 30x, and
indicates that the destination is the mobile object 30y. In addition, indicates that the destination is changed to the mobile object 30y.
[0033] The application server 10 transmits, to the base station 20a, the dynamic
15 map information the destination of which is the mobile object 30x (S10). The base
station 20a receives the dynamic map information and transmits the dynamic map
information to the mobile object 30x (S20). As a result, the mobile object 30x
receives the dynamic map information, and executes the fully automated driving of
the vehicle under a specific condition (Level 4 automated driving) using the
20 dynamic map information.
[0034] The mobile object 30x may move from an area where communication
with the base station 20a can be performed to an area where communication with
the base station 20b can be performed. In this case, the base station 20a notifies
the mobile object 30x to perform a handover to the base station 20b before the base
25 station 20a becomes unable to communicate with the mobile object 30x. At the
time of this notification, if the base station 20a can confirm that the mobile object
30x is starting fallback operation, the base station 20a also notifies the mobile object
30x of the handover timing, i.e. the timing when the handover is performed. In
this manner, when the mobile object 30x is performing fallback operation, the base
30 station 20a notifies the mobile object 30x of the handover destination and the
handover timing (S30).
[0035] For example, the base station 20a may determine whether the mobile
10
object 30x is starting fallback operation based on whether the mobile object 30x
satisfies a condition for starting fallback operation, or may inquire of the mobile
object 30x whether to start fallback operation.
[0036] If the mobile object 30x executes the handover while staying in fallback
5 operation, loss is caused in the reception of the dynamic map information. The
base station 20a sets, as the timing when the handover is performed, a timing at
which the mobile object 30x loses only information with a high update frequency
among the dynamic map information. Information with a high update frequency
is information that is updated at shorter intervals than specific time intervals. An
10 example of information with a high update frequency is the dynamic information
included in the dynamic map information.
[0037] Thereafter, until receiving a change of the destination of the dynamic
map information from the base station 20a, the application server 10 transmits the
dynamic map information the destination of which is the mobile object 30x to the
15 base station 20a (S40). As a result, the base station 20a receives the dynamic map
information and transmits the dynamic map information to the mobile object 30x
(S50).
[0038] After notifying the mobile object 30x of the handover destination and
the handover timing, the base station 20a selects the mobile object 30y near the
20 mobile object 30x, and requests the mobile object 30x to establish a sidelink
connection between the mobile object 30x and the mobile object 30y. The
communication device that is selected by the base station 20a is a device (here, the
mobile object 30y) capable of sidelink connection with the mobile object 30x.
The sidelink connection is a sidelink-type connection in which direct
25 communication is performed between the vehicles, namely between the mobile
objects 30x and 30y.
[0039] After receiving the request, the mobile object 30x makes a request to
the mobile object 30y for the sidelink connection with the mobile object 30y. As
a result, the mobile object 30y accepts the sidelink connection, and communication
30 through the sidelink connection is enabled between the mobile objects 30x and 30y.
[0040] Note that the base station 20a may request the mobile object 30y to
establish a sidelink connection between the mobile objects 30x and 30y. In this
11
case, the mobile object 30y makes a request to the mobile object 30x for the sidelink
connection with the mobile object 30x. Then, the mobile object 30x accepts the
sidelink connection, and communication through the sidelink connection is enabled
between the mobile objects 30x and 30y.
5 [0041] After completing the sidelink connection, the base station 20a transmits
a destination change request to the application server 10 (S60). Specifically, the
base station 20a requests the application server 10 to designate the mobile object
30y as the destination of the dynamic information of the dynamic map information
to be delivered to the mobile object 30x and deliver the dynamic information. This
10 request specifies that the timing at which the mobile object 30y is designated as the
destination of the dynamic information and the dynamic information is delivered is
the timing when the mobile object 30x performs the handover from the base station
20a to the base station 20b. That is, the base station 20a transmits, to the
application server 10, a request for changing the destination to the mobile object
15 30y at the handover timing of the mobile object 30x. In addition, the base station
20a transmits the handover timing of the mobile object 30x to the application server
10.
[0042] As a result, at the timing when the mobile object 30x performs the
handover from the base station 20a to the base station 20b, the application server
20 10 delivers the dynamic information of the dynamic map information for the mobile
object 30x to the base station 20a by setting the mobile object 30y as the destination
(S70).
[0043] The base station 20a transmits the dynamic information of the dynamic
map information for the mobile object 30x to the mobile object 30y (S80). In this
25 case, the base station 20a adds flag information indicating that relay is to be
performed to a packet of dynamic map information (in the first embodiment,
dynamic information) and transmits the packet to the mobile object 30y.
[0044] The mobile object 30y relays the dynamic information of the dynamic
map information for the mobile object 30x received from the base station 20a to the
30 mobile object 30x by utilizing the communication having the communication
session established by the sidelink connection (S90). In this case, the mobile
object 30y determines whether the packet of dynamic information contains flag
12
information indicating that relay is to be performed. In response to determining
that the packet contains flag information, the mobile object 30y relays the dynamic
information to the mobile object 30x in the sidelink connection.
[0045] In this manner, when the mobile object 30x performs the handover from
5 the base station 20a to the base station 20b, the mobile object 30y relays the
dynamic information of the dynamic map information for the mobile object 30x
received from the base station 20a to the mobile object 30x.
[0046] Note that the destination change is not limited to the case where the
base station 20a requests the application server 10 to change the destination and the
10 application server 10 changes the destination of the dynamic information. For
example, the base station 20a may receive the dynamic information addressed to
the mobile object 30x from the application server 10 and change the destination to
the mobile object 30y.
[0047] After the handover to the base station 20b is completed, the mobile
15 object 30x cancels the communication session between the mobile objects 30x and
30y. Thereafter, the application server 10 transmits the dynamic map information
for the mobile object 30x to the base station 20b (S100), and the base station 20b
transmits the dynamic map information to the mobile object 30x (S110). Then,
the mobile object 30x receives the dynamic map information from the base station
20 20b.
[0048] As described above, in the dynamic map delivery system 1, the mobile
object 30y relays the dynamic map information that may have been lost in the
mobile object 30x to the mobile object 30x, and thus the mobile object 30x can
acquire the dynamic map information without losing the dynamic map information.
25 As a result, the dynamic map delivery system 1 can execute Level 4 automated
driving.
[0049] Note that during the handover, another device (e.g. a roadside unit)
instead of the mobile object 30y may relay the dynamic map information to the
mobile object 30x. In a case where the device that relays the dynamic map
30 information to the mobile object 30x is a roadside unit, the roadside unit near the
point where the mobile object 30x performs the handover relays the dynamic map
information to the mobile object 30x.
13
[0050] Thus, in the first embodiment, when the mobile object 30x performs
the handover, the mobile object 30y relays the dynamic information of the dynamic
map information for the mobile object 30x received from the base station 20a to the
mobile object 30x. As a result, the dynamic map delivery system 1 can execute
5 the switching to the base station 20b by handover without lowering the level of
automated driving even when the mobile object 30x is under fallback operation.
Therefore, the dynamic map delivery system 1 can execute Level 4 automated
driving even at the handover timing during fallback operation.
[0051] Second Embodiment.
10 Next, the second embodiment will be described. In the second embodiment,
the mobile object 30x determines the handover timing and notifies the base station
20a of the handover timing, and the base station 20a transmits the dynamic map
information that is lost at the handover timing to the mobile object 30y.
[0052] The dynamic map delivery system 1 according to the second
15 embodiment has the same configuration as the dynamic map delivery system 1
according to the first embodiment. In the first embodiment, only the dynamic
information is relayed by the mobile object 30y so that the information relayed is
limited to a minimum data amount. In the second embodiment, the mobile object
30x autonomously determines the handover timing, and notifies the base station 20a
20 of the determined handover timing. The base station 20a causes the mobile object
30y to relay the dynamic map information that is lost at the handover timing
determined by the mobile object 30x so that the dynamic map information is
transmitted to the mobile object 30x.
[0053] Thus, in the second embodiment, the mobile object 30x determines the
25 handover timing. As a result, while the handover timing is determined by the
mobile object 30x, the dynamic map delivery system 1 can execute the switching
to the base station 20b by handover without lowering the level of automated driving
even when the mobile object 30x is under fallback operation as in the first
embodiment. Therefore, the dynamic map delivery system 1 can execute Level 4
30 automated driving even at the handover timing during fallback operation as in the
first embodiment.
[0054] Third Embodiment.
14
Next, the third embodiment will be described with reference to FIGS. 3 and 4.
In the first and second embodiments, the other mobile object 30y different from the
mobile object 30x relays the dynamic information to the mobile object 30x to
maintain the Level 4 automated driving of the mobile object 30x. In the third
5 embodiment, the base station 20a interpolates the dynamic information by
predicting the dynamic information, and delivers the predicted dynamic
information to the mobile object 30x in advance.
[0055] FIG. 3 is a diagram illustrating a configuration of a dynamic map
delivery system according to the third embodiment. Components in FIG. 3 that
10 achieve the same functions as those of the dynamic map delivery system 1
according to the first embodiment illustrated in FIG. 1 are denoted by the same
reference signs, and redundant descriptions are omitted.
[0056] The dynamic map delivery system 2 includes the application server 10,
the base stations 20a and 20b, and the mobile object 30x. The third embodiment
15 describes a case where the mobile object 30x performs a handover from the base
station 20a to the base station 20b during fallback operation. During fallback
operation, the mobile object 30x cannot be connected to a plurality of base stations
simultaneously, and is for a moment not connected to either the base station 20a or
the base station 20b.
20 [0057] The base stations 20a and 20b according to the third embodiment
include data servers 200a and 200b, respectively. The data server 200a is a server
that stores the dynamic map information that has been delivered from the
application server 10 to the mobile object 30x. The data server 200b is a server
that stores the dynamic map information to be delivered from the application server
25 10 to the mobile object 30x.
[0058] Next, processing for delivering dynamic map information in the
dynamic map delivery system 2 will be described. FIG. 4 is a sequence diagram
illustrating a procedure for delivering dynamic map information by the dynamic
map delivery system according to the third embodiment. Note that processes
30 similar to the processes described in the first and second embodiments are not
described here.
[0059] FIG. 4 illustrates an operational flowchart for a data
15
transmission/reception process that is executed among the application server 10, the
base stations 20a and 20b, and the mobile object 30x. The following section
describes a case where the mobile object 30x moves from an area where
communication with the base station 20a is possible to an area where
5 communication with the base station 20b is possible.
[0060] Note that in some parts in FIG. 4, the mobile object 30x is denoted by
“30x” as in FIG. 2. For example, <20a→20b> indicates that the delivery route is
changed from the base station 20a to the base station 20b.
[0061] The processes S210 and S220 illustrated in FIG. 4 are similar to the
10 processes S10 and S20 described in FIG. 2. That is, the application server 10
transmits, to the base station 20a, the dynamic map information the destination of
which is the mobile object 30x (S210). The base station 20a receives the dynamic
map information and transmits the dynamic map information to the mobile object
30x (S220). As a result, the mobile object 30x receives the dynamic map
15 information, and executes the fully automated driving of the vehicle under a specific
condition (Level 4 automated driving) using the dynamic map information.
[0062] The mobile object 30x may move from an area where communication
with the base station 20a can be performed to an area where communication with
the base station 20b can be performed. In this case, the base station 20a notifies
20 the mobile object 30x of the handover destination and a handover instruction, i.e.
an instruction to perform the handover, before the base station 20a becomes unable
to communicate with the mobile object 30x (S230).
[0063] Specifically, the base station 20a notifies the mobile object 30x of the
handover destination and the handover instruction at the timing when the mobile
25 object 30x performs the handover to the base station 20b. At the time of this
notification, if the base station 20a can confirm that the mobile object 30x is starting
fallback operation, the base station 20a confirms the dynamic map information
accumulated in the data server 200a. The base station 20a extracts the dynamic
map information transmitted to the mobile object 30x from the dynamic map
30 information accumulated in the data server 200a, and predicts, from the extracted
dynamic map information, future dynamic map information corresponding to the
time required for the handover. That is, the base station 20a predicts the dynamic
16
map information in the period in which the mobile object 30x executes the handover.
[0064] The future dynamic map information predicted by the base station 20a
is predictive dynamic information, i.e. dynamic information predicted. The time
required for the handover may be a time set in advance as a literal, or may be a time
5 estimated by the base station 20a. Note that the future dynamic map information
predicted by the base station 20a may include semi-dynamic information, semistatic information, static information, and the like.
[0065] Note that the base station 20a may notify the mobile object 30x of the
handover destination and the handover timing in the process S230.
10 [0066] The application server 10 transmits, to the base station 20a, the dynamic
map information the destination of which is the mobile object 30x (S240). As a
result, the base station 20a receives the dynamic map information. The base
station 20a adds the future information predicted, namely the predictive dynamic
information, to the received dynamic map information, and transmits the dynamic
15 map information to the mobile object 30x (S250). That is, after notifying the
mobile object 30x to perform the handover, the base station 20a transmits the
predictive dynamic information to the mobile object 30x in response to receiving
the dynamic map information from the application server 10. In other words, the
base station 20a starts transmitting the predictive dynamic information to the mobile
20 object 30x at the timing when the base station 20a notifies the mobile object 30x to
perform the handover.
[0067] The application server 10 continues the process of transmitting the
dynamic map information the destination of which is the mobile object 30x to the
base station 20a (S260). The base station 20a receives the dynamic map
25 information. The base station 20a continues the process of adding the future
information predicted, namely the predictive dynamic information, to the received
dynamic map information and transmitting the dynamic map information to the
mobile object 30x (S270).
[0068] The application server 10 continues the process of transmitting the
30 dynamic map information the destination of which is the mobile object 30x to the
base station 20a until a delivery route change request is made by the base station
20a (S280).
17
[0069] The base station 20a continues the process of adding the predictive
dynamic information to the received dynamic map information and transmitting the
dynamic map information to the mobile object 30x until the timing when the mobile
object 30x starts the handover. Once the mobile object 30x starts the handover,
5 the base station 20a stops the process of transmitting the dynamic map information
the destination of which is the mobile object 30x to the mobile object 30x. The
mobile object 30x executes the fully automated driving of the vehicle under a
specific condition (Level 4 automated driving) based on the dynamic map
information and the predictive dynamic information received from the base station
10 20a.
[0070] Once the mobile object 30x starts the handover, the base station 20a
requests the application server 10 to change the delivery route (S290). That is, the
base station 20a requests the application server 10 to change the destination of the
dynamic map information for the mobile object 30x from the base station 20a to the
15 base station 20b.
[0071] As a result, the application server 10 changes the destination of the
dynamic map information for the mobile object 30x from the base station 20a to the
base station 20b. That is, the application server 10 transmits, to the base station
20b, the dynamic map information the destination of which is the mobile object 30x
20 (S300). The base station 20b receives the dynamic map information and transmits
the dynamic map information to the mobile object 30x (S310). As a result, the
mobile object 30x receives the dynamic map information, and executes the fully
automated driving of the vehicle under a specific condition (Level 4 automated
driving) using the dynamic map information.
25 [0072] Note that if the mobile object 30x starts the handover immediately after
S250, the processes S260 to S280 are not executed. In addition, the handover may
be started after the processes S260 and S270 are performed multiple times.
[0073] The second and third embodiments may be combined. That is, in the
dynamic map delivery system 2, the mobile object 30x may determine the handover
30 timing and notify the base station 20a of the handover timing, and the base station
20a may add the predictive dynamic information that is lost at the handover timing
to the dynamic map information and transmit the dynamic map information to the
18
mobile object 30y.
[0074] Thus, in the third embodiment, the base station 20a predicts the future
dynamic information at the time of the handover and transmits the predictive
dynamic information to the mobile object 30x. As a result, the dynamic map
5 delivery system 2 can execute the switching to the base station 20b by handover
without lowering the level of automated driving even under fallback operation.
Therefore, the dynamic map delivery system 2 can execute Level 4 automated
driving even at the handover timing during fallback operation as in the first
embodiment.
10 [0075] Fourth Embodiment.
Next, the fourth embodiment will be described with reference to FIG. 5. The
base station 20a according to the fourth embodiment transmits predictive dynamic
information to the mobile object 30x less frequently than the base station 20a
according to the third embodiment.
15 [0076] The dynamic map delivery system 2 according to the fourth
embodiment has the same configuration as the dynamic map delivery system 2
according to the third embodiment.
[0077] FIG. 5 is a sequence diagram illustrating a procedure for delivering
dynamic map information by the dynamic map delivery system according to the
20 fourth embodiment. Note that processes similar to the processes described in the
first to third embodiments are not described here. Like FIG. 4, FIG. 5 illustrates an
operational flowchart for a data transmission/reception process that is executed
among the application server 10, the base stations 20a and 20b, and the mobile
object 30x.
25 [0078] In the third embodiment, the base station 20a starts transmitting the
predictive dynamic information to the mobile object 30x at the timing when the
base station 20a notifies the mobile object 30x to perform the handover. In the
fourth embodiment, the base station 20a notifies the mobile object 30x of the
handover timing, and transmits the predictive dynamic information to the mobile
30 object 30x immediately before the handover timing.
[0079] The processes S410 to S450 illustrated in FIG. 5 are similar to the
processes S10 to S50 described in FIG. 2. For example, in S430, as in S30, the
19
base station 20a notifies the mobile object 30x of the handover destination and the
handover timing before the base station 20a becomes unable to communicate with
the mobile object 30x.
[0080] Thereafter, the dynamic map delivery system 2 executes the processes
5 S460 to S510 which are similar to the processes S260 to S310. For example, in
S470, as in S270, the base station 20a adds the future information predicted, namely
the predictive dynamic information, to the received dynamic map information and
transmits the dynamic map information to the mobile object 30x. That is, the base
station 20a transmits the dynamic map information received from the application
10 server 10 and the predictive dynamic information predicted using the data server
200a to the mobile object 30x immediately before the designated handover timing.
Thereafter, the mobile object 30x executes the handover from the base station 20a
to the base station 20b, and the application server 10 executes the change of the
delivery route.
15 [0081] The second and fourth embodiments may be combined. That is, in the
dynamic map delivery system 2, the mobile object 30x may determine the handover
timing and notify the base station 20a of the handover timing, and the base station
20a may add the predictive dynamic information that is lost at the handover timing
to the dynamic map information and transmit the dynamic map information to the
20 mobile object 30y.
[0082] Thus, in the fourth embodiment, the base station 20a transmits the
predictive dynamic information to the mobile object 30x immediately before the
handover timing. As a result, the dynamic map delivery system 2 can execute
Level 4 automated driving similar to that in the first embodiment with a small
25 amount of information transmission as compared with the third embodiment.
[0083] Fifth Embodiment.
Next, the fifth embodiment will be described with reference to FIGS. 6 and 7.
In the fifth embodiment, the dynamic information of the dynamic map information
is relayed when a plurality of mobile objects perform a handover.
30 [0084] FIG. 6 is a diagram illustrating a configuration of a dynamic map
delivery system according to the fifth embodiment. Components in FIG. 6 that
achieve the same functions as those of the dynamic map delivery system 1
20
according to the first embodiment illustrated in FIG. 1 are denoted by the same
reference signs, and redundant descriptions are omitted.
[0085] The dynamic map delivery system 3 has the same components as the
dynamic map delivery system 1. That is, the dynamic map delivery system 3
5 includes the application server 10, the base stations 20a and 20b, and the mobile
objects 30x and 30y.
[0086] In the fifth embodiment, both the mobile objects 30x and 30y are
connected to the base station 20a, and each of the mobile objects 30x and 30y
performs a handover to the base station 20b under fallback operation. In this case,
10 the mobile object 30x performs the handover first, and the mobile object 30y
performs the handover later. For example, the mobile object 30x starts moving
from an area where communication with the base station 20a is possible to an area
where communication with the base station 20b is possible earlier than the mobile
object 30y.
15 [0087] FIG. 7 is a sequence diagram illustrating a procedure for delivering
dynamic map information by the dynamic map delivery system according to the
fifth embodiment. Note that processes similar to the processes described in the
first to fourth embodiments are not described here.
[0088] FIG. 7 illustrates an operational flowchart for a data
20 transmission/reception process that is executed among the application server 10, the
base stations 20a and 20b, and the mobile objects 30x and 30y.
[0089] The mobile objects 30x and 30y may move from an area where
communication with the base station 20a can be performed to an area where
communication with the base station 20b can be performed. In this case, the base
25 station 20a notifies the mobile objects 30x and 30y that the mobile objects 30x and
30y perform a handover to the base station 20b before the base station 20a becomes
unable to communicate with the mobile object 30x. At the time of this notification,
if the base station 20a can confirm that the mobile objects 30x and 30y are starting
fallback operation, the base station 20a also notifies the mobile objects 30x and 30y
30 of the timing when the handover is performed. In this manner, the base station
20a notifies the mobile object 30x of the handover destination and the handover
timing (S610), and notifies the mobile object 30y of the handover destination and
21
the handover timing (S620).
[0090] When notifying the mobile objects 30x and 30y of the handover
destination and the handover timing, the base station 20a instructs the mobile
objects 30x and 30y to set up a communication session between the mobile objects
5 30x and 30y and in which order the handovers are performed. Following this
instruction, the mobile objects 30x and 30y set up the communication session.
[0091] The dynamic map delivery system 3 executes the processes S630 to
S700 which are similar to the processes S40 to S110. As a result, at the timing when
the mobile object 30x performs the handover from the base station 20a to the base
10 station 20b, the mobile object 30y relays the dynamic information included in the
dynamic map information for the mobile object 30x received from the base station
20a to the mobile object 30x.
[0092] Note that the mobile object 30x according to the fifth embodiment does
not cancel the communication session between the mobile objects 30x and 30y
15 following the completion of the handover to the base station 20b. After the mobile
object 30x completes the handover to the base station 20b, the mobile object 30y
executes the handover from the base station 20a to the base station 20b.
Specifically, until receiving a change of the destination of the dynamic map
information from the base station 20a, the application server 10 transmits the
20 dynamic map information the destination of which is the mobile object 30y to the
base station 20a (S710).
[0093] Once the mobile object 30x completes the handover to the base station
20b, the base station 20a transmits a destination change request to the application
server 10 (S720). Specifically, the base station 20a requests the application server
25 10 to designate the mobile object 30x as the destination of the dynamic information
of the dynamic map to be delivered to the mobile object 30y and deliver the
dynamic information. This request specifies that the timing at which the mobile
object 30x is designated as the destination and the dynamic information is delivered
is the timing when the mobile object 30y performs the handover from the base
30 station 20a to the base station 20b. That is, the base station 20a transmits, to the
application server 10, a request for changing the destination to the mobile object
30x at the handover timing of the mobile object 30y. In addition, the base station
22
20a transmits the handover timing of the mobile object 30y to the application server
10.
[0094] As a result, at the timing when the mobile object 30y performs the
handover from the base station 20a to the base station 20b, the application server
5 10 delivers the dynamic information of the dynamic map information for the mobile
object 30y to the base station 20b by setting the mobile object 30x as the destination
(S730).
[0095] The base station 20b transmits the dynamic information of the dynamic
map information for the mobile object 30y to the mobile object 30x (S740). In
10 this case, the base station 20b adds flag information indicating that relay is to be
performed to a packet of dynamic information and transmits the packet to the
mobile object 30x.
[0096] The mobile object 30x relays the dynamic information of the dynamic
map information for the mobile object 30y received from the base station 20b to the
15 mobile object 30y by utilizing the communication having the communication
session established by the sidelink connection (S750). In this case, the mobile
object 30x determines whether the packet of dynamic information contains flag
information indicating that relay is to be performed. In response to determining
that the packet contains flag information, the mobile object 30x relays the dynamic
20 information to the mobile object 30y in the sidelink connection.
[0097] In this manner, when the mobile object 30y performs the handover from
the base station 20a to the base station 20b, the mobile object 30x relays the
dynamic information of the dynamic map information for the mobile object 30y
received from the base station 20b to the mobile object 30y. As a result, the
25 dynamic map delivery system 3 can deliver the dynamic map information to the
plurality of mobile objects 30x and 30y under fallback operation without losing the
dynamic map information at the handover timing.
[0098] Note that the base station 20a does not necessarily make a destination
change request to the application server 10 for changing the destination of the
30 dynamic information, but the base station 20a may receive the dynamic information
addressed to the mobile object 30y from the application server 10 and change the
destination to the mobile object 30x.
23
[0099] After the handover to the base station 20b is completed, the mobile
object 30y cancels the communication session between the mobile objects 30x and
30y. Thereafter, the application server 10 transmits the dynamic map information
to the base station 20b, and the base station 20b transmits the dynamic map
5 information to the mobile object 30y. Then, the mobile object 30y receives the
dynamic map information from the base station 20b.
[0100] The second and fifth embodiments may be combined. That is, in the
dynamic map delivery system 3, the mobile object 30x may determine the handover
timing and notify the base station 20a of the handover timing, and the base station
10 20a may transmit the dynamic map information that is lost at the handover timing
to the mobile object 30y. In addition, in the dynamic map delivery system 2 3, the
mobile object 30y may determine the handover timing and notify the base station
20a of the handover timing, and the base station 20a may transmit the dynamic map
information that is lost at the handover timing to the mobile object 30x.
15 [0101] Moreover, the third and fifth embodiments may be combined. That is,
in the dynamic map delivery system 3, the base station 20a may transmit the
predictive dynamic information to the mobile objects 30x and 30y.
[0102] Moreover, the fourth and fifth embodiments may be combined. That
is, in the dynamic map delivery system 3, the base station 20a may transmit the
20 predictive dynamic information to the mobile object 30x immediately before the
handover timing of the mobile object 30x. In addition, in the dynamic map
delivery system 3, the base station 20a may transmit the predictive dynamic
information to the mobile object 30y immediately before the handover timing of
the mobile object 30y.
25 [0103] Moreover, the second and fifth embodiments may be combined. That
is, in the dynamic map delivery system 3, the mobile objects 30x and 30y may
determine the handover timing and notify the base station 20a of the handover
timing, and the base station 20a may add the predictive dynamic information that is
lost at the handover timing to the dynamic map information and transmit the
30 dynamic map information to the mobile objects 30x and 30y.
[0104] Thus, in the fifth embodiment, when the mobile object 30x performs
the handover, the mobile object 30y relays the dynamic information of the dynamic
24
map information for the mobile object 30x received from the base station 20a to the
mobile object 30x. In addition, when the mobile object 30y performs the handover,
the mobile object 30x relays the dynamic information of the dynamic map
information for the mobile object 30y received from the base station 20b to the
5 mobile object 30y.
[0105] As a result, the dynamic map delivery system 3 can execute the
switching to the base station 20b by handover without lowering the level of
automated driving even when the plurality of mobile objects 30x and 30y are under
fallback operation. Therefore, the dynamic map delivery system 3 can execute
10 Level 4 automated driving even at the handover timing during fallback operation as
in the first embodiment.
[0106] Next, a hardware configuration of the application server 10 will be
described. The application server 10 is implemented by processing circuitry.
The processing circuitry may be a memory and a processor that executes a program
15 stored in the memory, or may be dedicated hardware. The processing circuitry is
also called a control circuit.
[0107] FIG. 8 is a diagram illustrating an exemplary configuration of
processing circuitry in the case that the processing circuitry provided in the
application server according to the first to fifth embodiments is implemented by a
20 processor and a memory. The processing circuitry 90 illustrated in FIG. 8 is a
control circuit and includes a processor 91 and a memory 92. In a case where the
processing circuitry 90 is configured with the processor 91 and the memory 92,
each function of the processing circuitry 90 is implemented by software, firmware,
or a combination of software and firmware. Software or firmware is described as
25 a program and stored in the memory 92. In the processing circuitry 90, the
processor 91 reads and executes the program stored in the memory 92, thereby
implementing each function. That is, the processing circuitry 90 includes the
memory 92 for storing a program that results in the execution of processing of the
application server 10. It can also be said that this program is a program for causing
30 the application server 10 to execute each function implemented by the processing
circuitry 90. This program may be provided by a storage medium in which the
program is stored, or may be provided by other means such as a communication
25
medium.
[0108] It can also be said that the above program is a program that causes the
application server 10 to execute the process of delivering the dynamic map
information to the mobile objects 30x and 30y via the base station 20a or the base
5 station 20b.
[0109] The processor 91 is exemplified by a central processing unit (CPU), a
processing device, an arithmetic device, a microprocessor, a microcomputer, or a
digital signal processor (DSP). Examples of the memory 92 include a non-volatile
or volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disc,
10 a compact disc, a mini disc, a digital versatile disc (DVD), and the like. Examples
of non-volatile or volatile semiconductor memories include a random access
memory (RAM), a read only memory (ROM), a flash memory, an erasable
programmable ROM (EPROM), an electrically EPROM (EEPROM, registered
trademark), and the like.
15 [0110] FIG. 9 is a diagram illustrating an example of processing circuitry in
the case that the processing circuitry provided in the application server according
to the first to fifth embodiments is implemented by dedicated hardware. For
example, the processing circuitry 93 illustrated in FIG. 9 is a single circuit, a
composite circuit, a programmed processor, a parallel programmed processor, an
20 application specific integrated circuit (ASIC), a field programmable gate array
(FPGA), or a combination thereof. The processing circuitry 93 may be partially
implemented by dedicated hardware, and partially implemented by software or
firmware. In this manner, the processing circuitry 93 can implement the abovedescribed functions using dedicated hardware, software, firmware, or a
25 combination thereof.
[0111] The configurations described in the above-mentioned embodiments
indicate examples. The embodiments can be combined with another well-known
technique and with each other, and some of the configurations can be omitted or
changed in a range not departing from the gist.
30
Reference Signs List
[0112] 1 to 3 dynamic map delivery system; 10 application server; 20a, 20b
26
base station; 30x, 30y mobile object; 90, 93 processing circuitry; 91 processor; 92
memory; 200a, 200b data server; 300x, 300y mobile communication unit; 301x,
301y sidelink communication unit.
27
WE CLAIM:
1. An application server (10) that delivers dynamic map information to a first
mobile object (30x) that receives the dynamic map information, the dynamic map
5 information being information of a dynamic map that is used for execution of fully
automated driving under a specific condition, wherein
when the first mobile object (30x) executes a handover from a first base station
(20a) capable of transmitting the dynamic map information in a first area to a second
base station (20b) capable of transmitting the dynamic map information in a second
10 area, in a case where the first mobile object (30x) is in fallback operation in which
simultaneous communication with the first base station (20a) and the second base
station (20b) is unavailable, the application server (10) delivers the dynamic map
information to the first mobile object (30x) via the first base station (20a) and a
communication device (30y) capable of receiving the dynamic map information
15 from the first base station (20a).
2. A base station (20a) capable of transmitting dynamic map information in a first
area to a first mobile object (30x) that receives the dynamic map information, the
dynamic map information being information of a dynamic map that is used for
20 execution of fully automated driving under a specific condition, wherein
when the first mobile object (30x) executes a handover from the base station
(20a) to an other base station (20b) capable of transmitting the dynamic map
information in a second area, in a case where the first mobile object (30x) is in
fallback operation in which simultaneous communication with the base station
25 (20a) and the other base station (20b) is unavailable, the base station (20a) receives
the dynamic map information from an application server (10) that delivers the
dynamic map information, and transmits the dynamic map information to the first
mobile object (30x) via a communication device (30y) capable of receiving the
dynamic map information.
30
3. A dynamic map delivery system (1) comprising:
a first mobile object (30x) to receive dynamic map information that is
28
information of a dynamic map that is used for execution of fully automated driving
under a specific condition;
a first base station (20a) capable of transmitting the dynamic map information
in a first area;
5 a second base station (20b) capable of transmitting the dynamic map
information in a second area;
an application server (10) to deliver the dynamic map information to a the first
mobile object (30x) via the first base station (20a) or the second base station (20b);
and
10 a communication device (30y) capable of receiving the dynamic map
information from the first base station (20a), wherein
when the first mobile object (30x) executes a handover from the first base
station (20a) to the second base station (20b), in a case where the first mobile object
(30x) is in fallback operation in which simultaneous communication with the first
15 base station (20a) and the second base station (20b) is unavailable, the
communication device (30y) receives the dynamic map information from the first
base station (20a) and transmits the dynamic map information to the first mobile
object (30x), and the first mobile object (30x) receives the dynamic map
information from the communication device (30y).
20
4. The dynamic map delivery system (1) according to claim 3, wherein
in a case where the first mobile object (30x) is in the fallback operation when
executing the handover, the first base station (20a) transmits, to the application
server (10), a request for changing a destination of the dynamic map information to
25 be delivered to the first mobile object (30x) from the first mobile object (30x) to the
communication device (30y),
upon receiving the request, the application server (10) changes the destination
of the dynamic map information to be delivered to the first mobile object (30x) from
the first mobile object (30x) to the communication device (30y), and transmits the
30 dynamic map information to the first base station (20a),
the first base station (20a) transmits, to the communication device (30y), the
dynamic map information the destination of which has been changed,
29
the communication device (30y) transmits, to the first mobile object (30x), the
dynamic map information the destination of which has been changed, and
the first mobile object (30x) receives the dynamic map information the
destination of which has been changed.
5
5. The dynamic map delivery system (1) according to claim 3 or 4, wherein
the first mobile object (30x) receives the dynamic map information from the
communication device (30y) by performing sidelink communication with the
communication device (30y).
10
6. The dynamic map delivery system (1) according to any one of claims 3 to 5,
wherein
the first base station (20a) transmits dynamic information including
information on movement of a person as the dynamic map information to the first
15 mobile object (30x) via the communication device (30y).
7. The dynamic map delivery system (1) according to claim 6, wherein
the first base station (20a) sets, as a timing of the handover, a timing at which
loss is caused only in reception of the dynamic information in the first mobile object
20 (30x) by the first mobile object (30x) executing the handover while staying in the
fallback operation, and notifies the first mobile object (30x) of the timing of the
handover.
8. The dynamic map delivery system (1) according to any one of claims 3 to 7,
25 wherein
the first mobile object (30x) autonomously determines a timing of the handover,
and notifies the first base station (20a) of a handover timing determined, and
the first base station (20a) transmits, to the first mobile object (30x) via the
communication device (30y), the dynamic map information that is lost at the
30 handover timing determined by the first mobile object (30x).
9. The dynamic map delivery system (1) according to any one of claims 3 to 8,
30
wherein
the first base station (20a) adds flag information to the dynamic map
information and transmits the dynamic map information to the communication
device (30y), the flag information indicating that the dynamic map information is
5 to be transmitted by the communication device (30y) to the first mobile object (30x),
and
the communication device (30y) transmits the dynamic map information to the
first mobile object (30x) in a case where the dynamic map information contains the
flag information.
10
10. The dynamic map delivery system (1) according to claim 6 or 7, wherein
the first base station (20a) includes a data server (200a) to store the dynamic
map information that has been delivered from the application server (10) to the first
mobile object (30x), predicts dynamic information at a time when the first mobile
15 object (30x) performs the handover based on the dynamic map information stored
in the data server (200a), and transmits the dynamic information predicted to the
first mobile object (30x) as predictive dynamic information, and
during the handover, the fully automated driving under the specific condition
is executed using the predictive dynamic information.
20
11. The dynamic map delivery system (1) according to claim 10, wherein
after notifying the first mobile object (30x) of a timing of the handover, the
first base station (20a) starts a process of adding the predictive dynamic information
to the dynamic map information and transmitting the dynamic map information to
25 the first mobile object (30x).
12. The dynamic map delivery system (1) according to claim 10, wherein
the first base station (20a) adds the predictive dynamic information to the
dynamic map information received immediately before the first mobile object (30x)
30 starts the handover, and transmits the dynamic map information to the first mobile
object (30x).
31
13. The dynamic map delivery system (1) according to any one of claims 10 to 12,
wherein
the first base station (20a) predicts the dynamic map information
corresponding to a time required for the handover, and transmits the dynamic
5 information predicted to the first mobile object (30x) as predictive dynamic
information.
14. The dynamic map delivery system (1) according to any one of claims 3 to 13,
wherein
10 when the first mobile object (30x) and the communication device (30y) execute
a handover from the first base station (20a) to the second base station (20b), in a
case where the first mobile object (30x) and the communication device (30y) are in
fallback operation in which simultaneous communication with the first base station
(20a) and the second base station (20b) is unavailable, after the first mobile object
15 (30x) receives the dynamic map information via the first base station (20a) and the
communication device (30y), the communication device (30y) receives the
dynamic map information via the second base station (20b) and the first mobile
object (30x).
20 15. The dynamic map delivery system (1) according to any one of claims 3 to 13,
wherein
the communication device (30y) is a second mobile object or a roadside unit.
16. A control circuit (90) for controlling an application server (10) that delivers
25 dynamic map information to a first mobile object (30x) that receives the dynamic
map information, the dynamic map information being information of a dynamic
map that is used for execution of fully automated driving under a specific condition,
the control circuit (90) causing the application server (10) to execute
when the first mobile object (30x) executes a handover from a first base station
30 (20a) capable of transmitting the dynamic map information in a first area to a second
base station (20b) capable of transmitting the dynamic map information in a second
area, in a case where the first mobile object (30x) is in fallback operation in which
32
simultaneous communication with the first base station (20a) and the second base
station (20b) is unavailable, delivering the dynamic map information to the first
mobile object (30x) via the first base station (20a) and a communication device
(30y) capable of receiving the dynamic map information from the first base station
5 (20a).
17. An information delivery method for an application server (10) to deliver
dynamic map information to a first mobile object (30x) that receives the dynamic
map information, the dynamic map information being information of a dynamic
10 map that is used for execution of fully automated driving under a specific condition,
the information delivery method comprising
a delivery step in which when the first mobile object (30x) executes a handover
from a first base station (20a) capable of transmitting the dynamic map information
in a first area to a second base station (20b) capable of transmitting the dynamic
15 map information in a second area, in a case where the first mobile object (30x) is in
fallback operation in which simultaneous communication with the first base station
(20a) and the second base station (20b) is unavailable, the application server (10)
delivers the dynamic map information to the first mobile object (30x) via the first
base station (20a) and a communication device (30y) capable of receiving the
20 dynamic map information from the first base station (20a).