WO2018032654A1

WO2018032654A1 - Offline map acquisition method, and in-vehicle unit

Info

Publication number: WO2018032654A1
Application number: PCT/CN2016/108330
Authority: WO
Inventors: 刘均; 宋朝忠; 欧阳张鹏
Original assignee: 深圳市元征科技股份有限公司
Priority date: 2016-08-19
Filing date: 2016-12-02
Publication date: 2018-02-22
Also published as: CN106323300A

Abstract

Provided in embodiments of the present invention are an offline map acquisition method, and in-vehicle unit. The method comprises: an in-vehicle unit sends to a roadside unit a connection request and establishes a connection to the roadside unit; the in-vehicle unit sends to the roadside unit a regional map acquisition request; and the in-vehicle unit receives map data of an area of the roadside unit sent by the roadside unit, wherein the map data of the area of the roadside unit is acquired the roadside unit on the basis of the regional map acquisition request, and sent to the in-vehicle unit. The present invention can be employed to solve the problem of map acquisition when an in-vehicle unit does not have a mobile network access.

Description

Instruction title: An offline map acquisition method and vehicle unit

[0001] Technical Field

[0002] The present invention relates to the field of electronic technologies, and in particular, to an offline map acquisition method and an onboard unit.

BACKGROUND

[0004] At present, maps of in-vehicle devices are generally downloaded and updated in the presence of a network, or the offline map data packets are downloaded first in the case of a network, and then used without a network. However, there is a case where the user does not currently have a network to obtain a map, and does not download an offline map of the corresponding area in advance, so that when the user needs to use the map for navigation, it cannot be realized.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present invention is to provide an offline map acquisition method and a vehicle-mounted unit, which are used to solve the problem of map acquisition of an in-vehicle device without a mobile network.

An embodiment of the present invention provides an offline map obtaining method, where the method includes:

[0008] the vehicle unit sends a connection request to the roadside unit, and establishes a connection with the roadside unit;

[0009] the onboard unit sends an area map acquisition request to the roadside unit;

[0010] the vehicle-mounted unit receives map data of an area where the roadside unit is sent by the roadside unit, where map data of the area where the roadside unit is located is obtained by the roadside unit based on the area map Requesting acquisition and sending to the onboard unit.

[0011] Optionally, after receiving the map data of the area where the roadside unit is sent by the roadside unit, the onboard unit further includes:

[0012] The onboard unit outputs the map data through a display device.

[0013] Optionally, the map data has a corresponding area identifier, and the area identifier is regularly marked according to a relative position relationship of each area;

[0014] outputting the map data by the onboard unit through the display device includes:

[0015] the onboard unit determines, according to the pre-stored area identifier position relation table, a first area identifier adjacent to the area identifier corresponding to the received map data;

[0016] the onboard unit detects whether the area identifier corresponding to the at least one map data acquired in advance exists The first area identifier;

[0017] if present, the onboard unit acquires the map data corresponding to the first area identifier according to the received relative positional relationship between the area identifier corresponding to the map data and the first area identifier, and receives The map data that is obtained is combined with the map data corresponding to the first area identifier and output.

[0018] Optionally, the method further includes:

[0019] after the onboard unit receives the navigation instruction for the target location information input by the user, querying, in the map data, whether the target location information exists;

[0020] If the target location information exists, the onboard unit plans and outputs a driving route from a current location to a location corresponding to the target location information according to the map data.

[0021] Optionally, the method further includes:

[0022] the vehicle-mounted unit sends a traffic data update request for the map data to the roadside unit, so that the roadside unit acquires vehicle state information of a region, and generates a latest region according to the vehicle state information. Traffic data is sent to the onboard unit;

And [0023] the onboard unit receives the latest traffic data sent by the roadside unit, and updates the map data according to the latest traffic data.

[0024] Correspondingly, an embodiment of the present invention further provides an onboard unit, where the onboard unit includes:

[0025] a connection establishing module, configured to send a connection request to the roadside unit by the onboard unit, and establish a connection with the roadside unit;

a first sending module, configured to send, by the onboard unit, an area map obtaining request to the roadside unit; [0027] a map receiving module, configured to receive, by the onboard unit, the road sent by the roadside unit The map data of the area where the side unit is located, wherein the map data of the area where the roadside unit is located is obtained by the roadside unit based on the area map acquisition request, and is sent to the onboard unit.

[0028] Optionally, the onboard unit further includes:

[0029] a map output module, configured to output the map data by the display unit by the onboard unit.

[0030] Optionally, the map data has a corresponding area identifier, and the area identifier is regularly marked according to a relative positional relationship of each area;

[0031] The map output module includes:

[0032] an identifier determining unit, configured to determine, by the onboard unit, according to the pre-stored area identifier position relationship table Receiving, by the area corresponding to the map data, an adjacent first area identifier;

a determining unit, configured to detect, by the onboard unit, whether the first area identifier exists in an area identifier corresponding to the at least one map data acquired in advance;

[0034] an output unit, configured to: if present, the onboard unit acquires map data corresponding to the first area identifier according to the received area identifier corresponding to the map data and the first area identifier The positional relationship is obtained by synthesizing the received map data and the map data corresponding to the first area identifier.

[0035] Optionally, the onboard unit further includes:

[0036] a query module, configured to query, in the map data, whether the target location information exists after the onboard unit receives the navigation instruction for the target location information input by the user;

[0037] a route planning module, configured to: if the target location information exists, the onboard unit plans and outputs a driving route from a current location to a location corresponding to the target location information according to the map data.

[0038] Optionally, the onboard unit further includes:

[0039] a second sending module, configured to send, by the onboard unit, a traffic data update request for the map data to the roadside unit, so that the roadside unit acquires vehicle state information of a region, according to the The vehicle status information generates the latest traffic data of the area in which it is located, and transmits the traffic data to the onboard unit;

[0040] an update module, configured to receive, by the onboard unit, the latest traffic data sent by the roadside unit, and update the map data according to the latest traffic data.

[0041] In the embodiment of the present invention, a connection request is sent to the roadside unit by the onboard unit, and a connection is established with the roadside unit, and then the onboard unit sends an area map acquisition request to the roadside unit, the roadside unit Obtaining, according to the area map obtaining request, the map data of the area where the roadside unit is located, and transmitting the map data to the onboard unit, where the onboard unit receives the map data of the area where the roadside unit is located, which can solve the problem of the vehicle. The map gets the problem with the device without a mobile network.

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work. 1 is a schematic flowchart of an offline map acquisition method according to an embodiment of the present invention;

2 is a schematic diagram of a map data area division according to an embodiment of the present invention;

3 is a schematic diagram of a method for marking a region identifier according to an embodiment of the present invention;

4 is a schematic structural diagram of an onboard unit according to an embodiment of the present invention;

5 is a schematic structural diagram of a map output module of FIG. 3 according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another vehicle-mounted unit according to an embodiment of the present invention.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

[0052] First, the nouns involved in the embodiments of the present invention are first explained.

[0053] A roadside unit (RSU, abbreviated as Road Side Unit), which is installed on the road side and uses a dedicated short-range communication (DSRC) to communicate with an on-board unit (OBU, On Board Unit) or a server. .

[0054] An onboard unit (OBU) is a device that uses DSRC technology to communicate with an RSU and a server, and is usually installed in a vehicle to acquire data of its own vehicle, and with servers, roadside units, and other vehicles. The in-vehicle device performs data transmission and reception.

1 is a schematic flowchart of a method for acquiring an offline map according to an embodiment of the present invention. The method may be implemented by an onboard unit. The method as shown in the figure includes at least:

[0056] Step S101: The onboard unit sends a connection request to the roadside unit, and establishes a connection with the roadside unit.

[0057] Specifically, when the user needs to obtain an offline map from a roadside unit, the connection request may be sent to the roadside unit, where the request may carry the identifier of the vehicle unit or a connection address, such as a Bluetooth address, After receiving the connection request sent by the onboard unit, the edge unit can agree to the request and establish a connection with the onboard unit corresponding to the received identifier or connection address.

[0058] Step S102: The onboard unit sends an area map acquisition request to the roadside unit.

[0059] Specifically, after the connection between the onboard unit and the roadside unit is established, the area map acquisition request may be sent to the roadside unit, where the area map acquisition request is used to instruct the roadside unit to send to the onboard unit. A request for map data for the area where the roadside unit is located.

[0060] Step S103, the onboard unit receives map data of an area where the roadside unit is sent by the roadside unit, where map data of the area where the roadside unit is located is the roadside unit based on the The regional map acquisition request is acquired and sent to the onboard unit.

[0061] Specifically, after receiving the area map acquisition request, the roadside unit acquires map data of the area where the pre-stored roadside unit is located, and transmits map data of the area where the roadside unit is located to the vehicle-mounted unit.

[0062] It should be noted that, in the scenario of the embodiment of the present invention, map data of an area in which the road itself is located is pre-stored in the roadside unit. For example, as shown in FIG. 2, the area A includes a roadside unit 1 (traffic light), a roadside unit 2 (street light), and a roadside unit 3 (convenience store), and all of the three roadside units are pre-stored in the area A. Map data, that is, if the onboard unit transmits a regional map acquisition request after any of the roadside unit 1, the roadside unit 2, or the roadside unit 3 is connected, the received map data is the area A Map data shown.

[0063] Optionally, after step S103, the method further includes:

[0064] The onboard unit outputs the map data through a display device.

[0065] Specifically, after receiving the map data of the area where the roadside unit is located, the onboard unit may output the map data, for example, displaying image data of the map data on a display screen of the vehicle unit, and the voice data passes through the earphone or the speaker. Play it out.

[0066] Optionally, the map data has a corresponding area identifier, and the area identifier is regularly marked according to the relative positional relationship of each area, and the onboard unit outputs the map data through the display device, which may be:

[0067] The onboard unit determines, according to the pre-stored area identifier position relation table, a first area identifier adjacent to the area identifier corresponding to the received map data.

[0068] Specifically, the map data has a corresponding area identifier, where the area identifier may be identified according to a preset rule that can reflect the relative positional relationship between the areas. For example, as shown in FIG. 3, an exemplary identification manner, four regions adjacent to the region 1 may be labeled as 11, 12, 13, and 14, respectively, with the region 1, the region 12, and Areas adjacent to area 13 may be labeled 123, and so on.

[0069] The area identifier location relationship table is a mapping table reflecting the location relationship between the area identifier and the area, the area The identification position relationship table may be pre-stored in the vehicle-mounted unit, or may be acquired by the vehicle-mounted unit through the roadside unit, and is not specifically limited. The in-vehicle unit can search for the first area identifier adjacent to the area identifier corresponding to the received map data by using the area identifier position relationship table.

For example, if the area identifier position relationship table is as shown in Table 1, the area identifier corresponding to the map data received by the vehicle unit is 11, and the vehicle unit can determine the first area adjacent to the area identifier 11 corresponding to the map data according to Table 1. The identifiers are 1, 112 and 113 respectively.

[0072] The onboard unit detects whether the first area identifier exists in the area identifier corresponding to the at least one map data acquired in advance.

[0073] Specifically, in one scenario, the onboard unit has previously acquired at least one map data of another area, and the onboard unit may search for the first area identifier corresponding to the at least one map data that has been previously acquired. Area ID. Still using the above example, the area identifiers corresponding to at least one map data that have been acquired by the in-vehicle unit are 112, 124, and 14, respectively, and can be found after comparing with the first area identifiers 1, 11 2 and 113, and the area identifier 112 is the first An area identifier may be considered to exist in the area identifier corresponding to the at least one map data acquired in advance.

[0074] if present, the onboard unit acquires the map data corresponding to the first area identifier according to the received relative positional relationship between the area identifier corresponding to the map data and the first area identifier, and receives The map data that is obtained is combined with the map data corresponding to the first area identifier and output.

[0075] Specifically, when the onboard unit detects the area identifier corresponding to the at least one map data acquired in advance, If the first area identifier is present, the map data corresponding to the first area identifier and the map data of the area where the roadside unit is currently requested and acquired by the onboard unit may be combined and output. In the synthesis, the map data may be synthesized according to the relative positional relationship indicated by the received area map and the first area identifier.

[0076] For example, the first area existing in the onboard unit is identified as area B, area C, and area D, and the area identifier corresponding to the map data acquired by the current vehicle unit is area A, and the map is reflected according to the preset area identifier. The relative positional relationship of the data, the map data obtained by combining the area A, the area B, the area C, and the area D as shown in FIG. 2 can be output to the user.

[0077] Optionally, the method further includes:

[0078] After the onboard unit receives the navigation instruction for the target location information input by the user, it is queried in the map data whether the target location information exists.

[0079] Specifically, after receiving the map data offline, the onboard unit can navigate the vehicle in combination with the map data and the GPS navigation system. After receiving the navigation instruction for the target location information input by the user, the in-vehicle device may first search for the target location information input by the user in the at least one map data that has been acquired. In a specific implementation, the navigation instruction may be a pressing operation of the navigation button of the in-vehicle device, a gesture operation on the preset navigation icon, or a voice command issued to the in-vehicle device, and the like, and is not specifically limited herein. The navigation instruction includes target location information that the user needs to navigate, and the target location information may include a road name, a marker name, and the like.

[0080] If the target location information exists, the onboard unit plans and outputs a driving route from a current location to a location corresponding to the target location information according to the map data.

[0081] Specifically, the onboard unit searches for the target location information in the map data acquired in advance, and can plan a driving route for the user according to the current location of the in-vehicle device and the acquired map data.

[0082] In the specific implementation, there may be two scenarios. The first one is that the target location information is in the same area as the current location of the onboard unit, and then the in-vehicle device only needs to call the map data of the current area of the onboard unit to drive the vehicle. The route is only planned. The second type is that the target location information is not in the same area as the current location of the vehicle-mounted unit, and then the vehicle-mounted unit needs to first detect whether the map data corresponding to the target location information and the map data corresponding to the current location of the vehicle-mounted unit can be combined into a coherent map. Data, if available Therefore, the driving route can be planned only, otherwise the user is prompted not to plan the driving route.

[0083] Illustratively, in the second scenario, the in-vehicle device can determine whether the relative positional relationship between the two is based on the area identifier of the map data corresponding to the target location information and the area identifier of the map data corresponding to the current location of the vehicle-mounted unit. If they are adjacent, the driving route planning is directly performed according to the map data synthesized by the adjacent positional relationship; if not adjacent, the onboard unit may detect at least one map data acquired in advance in the in-vehicle unit. Whether there is map data that connects the map data of the two, and if so, a coherent map data is synthesized, and the driving route planning is performed based on the coherent map data.

[0084] Optionally, the method further includes:

[0085] the onboard unit transmits a traffic data update request for the map data to the roadside unit, so that the roadside unit acquires vehicle state information of a region, and generates a latest region according to the vehicle state information. Traffic data is sent to the onboard unit.

[0086] Specifically, the map data may include traffic data, and may be used to indicate data of a road's patency state, traffic flow, traffic indicator status, and the like in the map. Usually, the map data pre-stored by the roadside unit is generally acquired before, so the traffic data is not updated. After receiving the map data of the area where the roadside unit is located, the vehicle unit may send a traffic data update request to the roadside unit, and after receiving the traffic data update request, the roadside unit may acquire the vehicle state information of the area in which it is located, and then according to the vehicle. The state information generates the latest traffic data in the area where the roadside unit is located and sends it to the vehicle in the unit. The vehicle status information may include a vehicle position, a vehicle speed, a road vehicle density, a road traffic volume, and the like, and the specific acquisition manner may receive the vehicle status information sent by the vehicle or the roadside unit in the area through the vehicle network.

And [0087] the onboard unit receives the latest traffic data sent by the roadside unit, and updates the map data according to the latest traffic data.

[0088] Specifically, after receiving the latest traffic data of the area sent by the roadside unit, the onboard unit may update the acquired map data of the area.

[0089] The embodiment of the present invention sends a connection request to the roadside unit through the vehicle-mounted unit, and establishes a connection with the roadside unit through the vehicle network, and then the vehicle-mounted unit sends the area map to the roadside unit through the vehicle network. Acquiring a request, the roadside unit acquiring the area where the roadside unit is located based on the area map acquisition request The map data of the domain is sent to the onboard unit, and the onboard unit receives the map data of the area where the roadside unit is located by the roadside unit through the vehicle network, and can solve the problem that the in-vehicle device has no mobile network. Map gets the problem.

4 is a schematic structural diagram of an onboard unit according to an embodiment of the present invention, including:

[0091] The connection establishing module 410 is configured to send, by the onboard unit, a connection request to the roadside unit, and establish a connection with the roadside unit;

[0092] The first sending module 420 is configured to send, by the onboard unit, an area map obtaining request to the roadside unit

[0093] The map receiving module 430 is configured to receive, by the onboard unit, map data of an area where the roadside unit is sent by the roadside unit, where map data of the area where the roadside unit is located is the roadside The unit acquires based on the area map acquisition request and sends it to the onboard unit.

[0094] Optionally, the onboard unit further includes:

[0095] The map output module 440 is configured to output the map data by the display unit through the display unit.

[0096] Optionally, the map data has a corresponding area identifier, and the area identifier is regularly marked according to a relative positional relationship of each area;

[0097] The map output module 440 includes an identification determining unit 441, a determining unit 442, and an output unit 443, as shown in FIG. 5, wherein:

[0098] The identifier determining unit 441 is configured to determine, according to the pre-stored area identifier position relationship table, the first area identifier adjacent to the area identifier corresponding to the received map data;

[0099] The determining unit 442 is configured to detect, by the onboard component, whether the first area identifier exists in an area identifier corresponding to the at least one map data that is acquired in advance;

[0100] The output unit 443 is configured to: if yes, the onboard unit acquires the map data corresponding to the first area identifier according to the received area identifier corresponding to the map data and the first area identifier The relative positional relationship is obtained by synthesizing the received map data and the map data corresponding to the first area identifier.

[0101] Optionally, the onboard unit further includes:

[0102] The query module 450 is configured to: when the onboard unit receives the navigation instruction for the target location information input by the user, query the map data whether the target location information exists; [0103] The route planning module 460 is configured to: if the target location information exists, the onboard unit plans and outputs a driving route from a current location to a location corresponding to the target location information according to the map data.

[0104] Optionally, the onboard unit further includes:

[0105] The second sending module 470 is configured to send, by the onboard unit, a traffic data update request for the map data to the roadside unit, so that the roadside unit acquires vehicle state information of a region, according to the The vehicle status information generates the latest traffic data of the area in which it is located, and transmits the traffic data to the onboard unit;

[0106] The update module 480 is configured to receive, by the onboard unit, the latest traffic data sent by the roadside unit, and update the map data according to the latest traffic data.

[0107] The embodiment of the present invention sends a connection request to the roadside unit through the vehicle-mounted unit, and establishes a connection with the roadside unit through the vehicle network, and then the vehicle-mounted unit sends the area map to the roadside unit through the vehicle network. Obtaining a request, the roadside unit acquires map data of an area where the roadside unit is located based on the area map acquisition request, and sends the map data to the vehicle-mounted unit, and the vehicle-mounted unit receives the roadside unit transmission station by using the vehicle network The map data of the area where the roadside unit is located can solve the problem of map acquisition of the in-vehicle device without the mobile network.

FIG. 6 is a schematic structural diagram of another vehicle-mounted unit according to an embodiment of the present invention. As shown in FIG. 6, the onboard unit includes a processor 61, a memory 62, and a communication interface 63. The processor 61 is connected to a memory 62 and a communication interface 63, for example, the processor 61 can be connected to the memory 62 and the communication interface 63 via a bus.

[0109] The processor 61 is configured to support the onboard unit to perform the corresponding function in the above method. The processor 61 can be a central processing unit (English: central processing unit,

CPU), network processor (English: network processor, NP), hardware chip or any combination thereof. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The above PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), or a general array logic (GAL). Or any combination thereof

[0110] The memory 62 is used to store map data, traffic data, and the like. Memory 62 can include volatile memory Memory (English: volatile memory), such as random access memory (English: random-access memory, abbreviation: RAM); memory 62 may also include non-volatile memory (English: non-vol atile memory), such as read-only Memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive, abbreviation: SSD The memory 62 may also include a combination of the above types of memories.

[0111] The communication interface 63 is for wireless connection with the roadside unit.

[0112] The processor 61 can perform the following operations:

[0113] transmitting a connection request to the roadside unit through the communication interface 63, and establishing a connection with the roadside unit;

[0114] transmitting an area map acquisition request to the roadside unit through the communication interface 63;

The map data of the area where the roadside unit is sent by the roadside unit is received by the communication interface 63, wherein the map data of the area where the roadside unit is located is obtained by the roadside unit based on the area map. Requesting acquisition and sending to the onboard unit.

[0116] Optionally, after receiving the map data of the area where the roadside unit is sent by the roadside unit, the processor 61 is further configured to:

[0117] The map data is output by a display device.

[0118] Optionally, the map data has a corresponding area identifier, and the area identifier is regularly marked according to a relative position relationship of each area;

[0119] The processor 61 outputs the map data by using a display device, specifically for:

[0120] determining, according to the pre-stored area identifier location relationship table, a first area identifier adjacent to the area identifier corresponding to the received map data;

[0121] detecting whether the first area identifier exists in an area identifier corresponding to the at least one map data acquired in advance;

[0122] if yes, acquiring the map data corresponding to the first area identifier according to the received relative positional relationship between the area identifier corresponding to the map data and the first area identifier, and the received The map data corresponding to the first area identifier is synthesized and output.

[0123] Optionally, the processor 61 is further configured to:

[0124] after the onboard unit receives the navigation instruction for the target location information input by the user, Querying whether the target location information exists in the graph data;

[0125] If the target location information exists, the onboard unit plans and outputs a driving route from a current location to a location corresponding to the target location information according to the map data.

[0126] Optionally, the processor 61 is further configured to:

[0127] transmitting, by the communication interface 63, a traffic data update request for the map data to the roadside unit, so that the roadside unit acquires vehicle state information of a region, and generates a latest region according to the vehicle state information. Traffic data is sent to the onboard unit;

[0128] receiving the latest traffic data sent by the roadside unit through the communication interface 63, and updating the map data according to the latest traffic data.

[0129] Those skilled in the art can understand that all or part of the process of implementing the above embodiments may be completed by a computer program to instruct related hardware, and the program may be stored in a computer readable storage medium. The program, after execution, may include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, or a read-only storage memory (Read-Only)

Memory, ROM) or Random Access Memory (RAM).

The above disclosure is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the claims of the present invention are still within the scope of the present invention. technical problem

Problem solution

Advantageous effects of the invention

Claims

Claim

[Attachment 1] An offline map acquisition method, the method comprising:

The vehicle unit sends a connection request to the roadside unit and establishes a connection with the roadside unit; the vehicle unit sends a regional map acquisition request to the roadside unit;

The vehicle-mounted unit receives the map data of the area where the roadside unit is sent by the roadside unit, where the map data of the area where the roadside unit is located is obtained by the roadside unit based on the area map acquisition request. And sent to the onboard unit.

[Claim 2] The method according to claim 1, wherein, after the onboard unit receives the map data of the area where the roadside unit is sent by the roadside unit, the method further includes: The display device outputs the map data.

[Claim 3] The method according to claim 2, wherein the map data has a corresponding area identifier, and the area identifier is regularly marked according to a relative positional relationship of each area; Outputting the map data includes:

Determining, by the onboard unit, the first area identifier adjacent to the area identifier corresponding to the received map data according to the pre-stored area identifier position relationship table; the onboard unit detecting the area corresponding to the at least one map data acquired in advance Whether the first area identifier exists in the identifier;

If yes, the onboard unit acquires the map data corresponding to the first area identifier according to the received relative positional relationship between the area identifier corresponding to the map data and the first area identifier, and the received location The map data corresponding to the first area identifier is synthesized and output.

[Claim 4] The method according to claim 1, wherein the method further comprises:

After the onboard unit receives the navigation instruction for the target location information input by the user, querying, in the map data, whether the target location information exists;

If the target location information exists, the onboard unit plans according to the map data And driving the driving route from the current position to the position corresponding to the target position information.

[Claim 5] The method according to claim 1, wherein the method further comprises:

The vehicle-mounted unit sends a traffic data update request for the map data to the roadside unit, so that the roadside unit acquires vehicle state information of a region, and generates latest traffic data of the region according to the vehicle state information. And transmitting to the onboard unit; the onboard unit receives the latest traffic data sent by the roadside unit, and updates the map data according to the latest traffic data.

[Claim 6] The vehicle-mounted unit is characterized in that:

a connection establishing module, configured to send a connection request to the roadside unit by the vehicle unit, and establish a connection with the roadside unit;

a first sending module, configured to send, by the onboard unit, an area map obtaining request to the roadside unit;

a map receiving module, configured to receive, by the onboard unit, map data of an area where the roadside unit is sent by the roadside unit, where map data of the area where the roadside unit is located is the roadside unit based on the The regional map acquisition request is acquired and sent to the onboard unit.

The vehicle-mounted unit according to claim 6, wherein the onboard unit further comprises: a map output module, wherein the onboard unit outputs the map data through a display device.

The vehicle-mounted unit according to claim 6, wherein the map data has a corresponding area identifier, and the area identifier is regularly marked according to a relative positional relationship of each area; the map output module includes :

An identifier determining unit, configured to determine, by the in-vehicle unit, a first area identifier adjacent to the area identifier corresponding to the received map data according to the pre-stored area identifier position relationship table; and a determining unit, configured to detect the in-vehicle unit At least one map data pair acquired in advance Whether the first area identifier exists in the area identifier of the area;

And an output unit, configured to acquire the relative positional relationship between the area identifier corresponding to the received map data and the first area identifier according to the received map data, if yes, And synthesizing the received map data and the map data corresponding to the first area identifier, and outputting the map data.

The vehicle-mounted unit according to claim 6, wherein the on-board unit further comprises: a query module, configured to: when the on-board unit receives a navigation instruction for target location information input by a user, Querying, in the map data, whether the target location information exists; the route planning module, configured to: if the target location information exists, the onboard unit plans and outputs the current location from the current location according to the map data The driving route of the location corresponding to the target location information.

The vehicle-mounted unit according to claim 6, wherein the on-board unit further includes: a second transmitting module, configured to send, by the onboard unit, the map data to the roadside unit a traffic data update request, so that the roadside unit acquires vehicle state information of a region, generates latest traffic data of the region according to the vehicle state information, and sends the traffic data to the onboard unit;

And an update module, configured to receive, by the onboard unit, the latest traffic data sent by the roadside unit, and update the map data according to the latest traffic data.