JPH022497A - Route guide system in moving body communication system - Google Patents

Abstract

PURPOSE:To make it possible for a mobile station to guide a subscriber's vehicle to a destination even if a center does not monitor the traveling route of the mobile station by resending a transmission request for an optimum route from the mobile station to the center at the time of missing the advancing route. CONSTITUTION:When the mobile station mounted on the subscriber's vehicle 12 requests the transmission of route guide information, the request is informed to the center 26 through a communication line network 22. The center 26 selects an optimum route to be traveled by the mobile station under the consideration of a traffic flow state and sends the selected route to the mobile station as the optimum route information. The mobile station guides the route based on the optimum route information and base station information transmitted from a road station 10. At the time of recognizing the missing of the required route by collating the base station information with the optimum route information, the mobile station resends a route guide information sending request to the center 26.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mobile communication system, and more specifically, to a route guidance method in a mobile communication system that provides route guidance to a vehicle such as an automatic 1V.

(Prior Art) An example of a route guidance system in a conventional mobile communication system to which the present invention is particularly related is an automobile navigation system. Auto+l (navigation system for
In this system, map information recorded on an optical recording medium such as a CD-ROM and a CRT display for displaying the information are installed on the vehicle-mounted device, and the current driving position is displayed on the map displayed on the display. . In this navigation system, a transmitter for transmitting position information is installed on, for example, a road information board, and a receiver for receiving this position information is installed on the vehicle side. Each time the vehicle receives position information from the transmitter, it corrects the vehicle position on the map displayed on the display, and until the next position information is received, the vehicle operates autonomously based on the vehicle's direction, speed, etc. Update the vehicle position automatically. The passenger recognizes his or her current position from the vehicle's map displayed on the display, and uses this information to determine whether or not the vehicle is heading toward its destination.

(Problem to be solved by the invention) In this way, in the conventional technology, the passenger has to select the course to the destination, and it is possible to check whether the vehicle is not taking the wrong course with respect to the destination. It was nothing more than

Furthermore, in the conventional technology, the route to the destination is determined by the passenger, so it is not possible to select an appropriate route depending on the traffic situation. Furthermore, the conventional technology requires map information on the vehicle side. It is difficult to record all detailed map information for each region due to limitations in the storage capacity of recording media. Therefore, depending on the destination, the passenger may not be able to accurately select a route. Also,
Map information is originally updated over time, and may also be changed temporarily depending on the situation.

Therefore, even if such fluid information is prepared in advance, it is difficult to quickly respond to changes or additions to its contents.

An object of the present invention is to provide a route guidance method in a mobile communication system that eliminates the drawbacks of the conventional technique (Ik) and makes it possible to guide an optimal route to a destination according to traffic conditions.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has a plurality of base stations that wirelessly communicate with mobile stations, a plurality of base stations are accommodated, a plurality of base stations are accommodated, and a plurality of base stations are connected to the plurality of base stations. The base station includes a communication line network for exchanging communications and a center that is connected to the communication line 1 network and selects the optimal route according to traffic flow conditions, and the base station transmits base station information including base station location information to mobile stations. When the mobile station sends a request to send route guidance information, the communication line network notifies the center of the sending request, and upon receiving the sending request, the center selects the optimal route according to the traffic flow situation and Optimum route information indicating the route is sent to the mobile station via a communication line network, and upon receiving the optimal route information, the mobile station performs route guidance based on the optimal route information and the base station information sent from the base station, When the mobile station verifies the base station information and the optimal route information and recognizes that the mobile station has deviated from the route indicated by the optimal route information, it resends the route guidance information transmission request.

(Function) According to the present invention, when a mobile station requests the transmission of route guidance information, this request is notified to the center via the communication network. When the center receives this notification, it selects the optimal route for the mobile station to travel in consideration of traffic flow conditions, and sends this as optimal route information to the mobile station that made the transmission request through the communication network.

Upon receiving the optimal route information, the mobile station performs route guidance using the received route information and the base station information transmitted from the base station it passes, and the mobile station performs route guidance by comparing the base station information and the optimal route information. When it recognizes that the route has deviated, it resends a request to send route guidance information to the center.

(Example) Next, an example of a route guidance system in a mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which the mobile communication system according to the present invention is applied to land transportation, particularly road traffic for vehicles including automobiles, as a road-to-vehicle individual communication system. A plurality of road-L stations 10 are arranged at predetermined intervals along roads and expressways, for example, at intervals of several hundred meters to several kilometers. This interval is
For example, it may be set to an appropriate value depending on the vehicle speed allowed on the road. The roadside station 10 is a ground station that functions as a base station that wirelessly communicates with participating vehicles 12 on the road.

1 station IO has a transceiver 14, which is a mobile station mounted on the joining vehicle 12, that is, an on-vehicle device 18 (FIG. 5).
0 transmits and receives radio waves 18 to and from the vehicle 12, and communicates with vehicles 12 existing within the service area, that is, the zone 20.
One of the characteristics of this embodiment is that the size of the zone 20 is much smaller than the interval at which the road stations IO are arranged, and the road stations IO are arranged intermittently. The diameter may be, for example, on the order of several tens of meters to 100 meters.Therefore, between two adjacent zones 20, there is an area where the mobile station 16 does not substantially respond to the radio waves transmitted by the base station IO, that is, a "no radio wave" zone. The vehicle 12 is only allowed to use the roadside station while it is included in the zone 20.
You can communicate with.

As you will see, in this method, two adjacent on-road stations
The same frequency can be effectively used repeatedly for 0 as well. Therefore, basically, the road station 10 and the mobile station 16
It is sufficient to use medium frequencies throughout the system for the radio link between For systems that allow full duplex communication, a pair of very different frequencies are used under E.

This eliminates the need for frequency zone switching as in conventional cellular systems. Because of these characteristics, this method is called the "intermittent minimum zone method" and the zone 20 is called the "minimum zone." Note that the wireless communication between the roadside station 10 and the mobile station 16 involves very short-term radio wave propagation. Because of this, it is less susceptible to fading effects, so 2
High-speed communication of about 58 Kbit/s - 1.5 Mbit/s is possible. Particularly in this embodiment, considering cost minimum, it is desirable to set the speed to about 512 Kbit/s, for example.

The roadside station 10 constitutes a part of a road-to-vehicle individual communication network 22, and can access other communication facilities such as a road-to-vehicle system center 26 in this embodiment via the road-to-vehicle individual communication network 22. In this embodiment, the road-to-vehicle individual communication network 22 is
It is a communication line network that has a station hierarchy configuration as illustrated in the figure and performs switching or exchange between the road-to-vehicle system center 26 and the mobile station 16.

With such an intermittent minimum zone method, communication between the mobile station 16 and the roadside station 10 can be made faster, and a variety of route guidance services including high-speed data communication can be provided. In other words, as in this embodiment, there is a navigation system that guides participating vehicles 12 such as automobiles to appropriate routes depending on road congestion and weather conditions, and a navigation system that guides participating vehicles 12 such as cars to appropriate routes according to road congestion and weather conditions.
For the purpose of efficiently managing the operation of the mobile station, data communication can be performed between the center 26 and the mobile station 16 via the road-to-vehicle individual communication line P22.

Referring to FIG. 2, the road-to-vehicle individual communication circuit in this embodiment! ! #122 is a district station 30 that accommodates a plurality of street stations IO located in a certain district, and a plurality of district stations 30
It has a hierarchical structure consisting of an inter-regional station 32 that accommodates regional information over a certain area, and a general office 34 that accommodates several of these inter-regional stations 32. These stations 3 including the roadside station IO
0.32.34 is called the ground station.

In this embodiment, the lines between the district stations 30, the inter-regional stations 32, and the general office 34 form a tree-like line network consisting of trunk lines and trunk lines 38 such as diagonal lines. , which constitutes a set-up line network. It is obvious that the present invention is not limited to this other form, and may take other forms such as a local hierarchy structure depending on the road type such as a general road or an expressway, or a linear network. Not even.

The road-to-vehicle system center 26 is, for example, an information processing system that processes navigation for the participating vehicle 12. That is, the system center 26 receives road information and traffic-related information from the communication line 22 and an external information center (not shown), and estimates and predicts the traffic flow situation based on this information. When the center 26 receives a request to send a route guidance code to a destination from the mobile station 16, it selects an optimal route based on the estimated traffic flow conditions, creates a route guidance code, and sends it to the mobile station 1B. In this embodiment, the guidance code indicates the station code of the station 10 on the way to the 11 targets, and is stored as a guidance list (Fig. 7) in the memory 212 (Fig. 5) of the mobile station 16, which will be described later. be done. Road-to-vehicle system center 26 is inside! are accommodated in the general office 34 by line 40. Of course, these may be connected to the regional station 32 or the district station 30.

In this embodiment, the vehicle-specific code for identifying the mobile station 16 is composed of a static code 50 and a dynamic code 60, as shown in FIG. In addition to its function as an identification number for the mobile station 16, it is closely related to the number system used when a call is received from the road-to-vehicle communication system center 26 to the mobile station 16. The static coat 50 includes a mobile station code 54 for identifying the mobile station 16, a registered ground station code 52 for indicating the registered station, and a system code 56 for identifying the system.

The dynamic code 60 is a code corresponding to the movement state of the participating vehicle 12, and is effectively used to grasp the current situation of the participating vehicle 12 and navigate. Therefore, it is a vehicle-specific code related to the driving area and movement status of the subscriber vehicle 12, and is used to search for the vehicle position for individual communication from the system center 26, and to provide route guidance information to the travel destination of the subscriber vehicle 12. It plays an important role in providing services, etc. Therefore, in this embodiment, a destination code 82 indicating the destination of operation of the participating vehicle 12 and a driving area code 64 indicating the current driving area are included. In this embodiment, when a link number code of a travel destination is set in the destination code 62, for example, this is sent to the road-to-vehicle system center 28 as a request to send a route guidance code.

As conceptually shown in FIG.
This includes a storage area in which static information including the position and orientation of the roadside station 10, roadside station information around the roadside station, etc. is stored. The road station 10 transmits its static information and road station surrounding information to all participating vehicles 12 passing by. In the case of this embodiment, the roadside station information may be, for example, ``If you go straight, there is an ○O intersection crossroads 300 meters ahead.
If you go straight through the O intersection, you will find street station X, if you turn left at the OO intersection, you will find street station y, and if you turn right at the OO intersection, you will find street station 2. ” The content is as follows.

In this embodiment, the mobile station 16 is a member vehicle 12 such as a car.
This is an in-vehicle device that is mounted on a vehicle and transmits and receives data such as navigation information and operation management information, messages, and image signals to and from the roadside station 10, and displays these signals visually and/or audibly to passengers. FIG. 5 shows a block diagram of the mobile station 18 in this embodiment. As shown in the figure, the mobile station 16 has a destination code 82, for example.
A key human power device 252 for inputting information such as a request to send a route guidance code, etc., a video display 256 for interfacing passengers with images and sounds, and a voice synthesis device 2.
80, voice recognition device 282, facsimile transmitting and receiving device 27
254 etc.

Each component of the mobile station 16 is under overall control by a control circuit 210. That is, the control circuit 210 includes a transmitter 200 and a receiver 202 that transmit and receive radio waves 18 to and from the roadside station 10, a speech synthesizer 280, and a display 25.
6 or the display control unit 230 that controls the display of the facsimile device δ254, the key human power device 252, and the facsimile device? 1254 or the content output from the voice recognition device 252? It controls the sending eight-passer 220 and the like that are input. The control circuit 210 is also connected to a memory 212, in which the route guidance code received from the road-to-vehicle system center 26 is stored as a route guidance list.

The control circuit 210 of the mobile station 1B that has accumulated the guidance list,
The traveling route is confirmed and selected from the static information received from the roadside station 10, and the traveling direction is notified to the passenger through the display 258 and/or the voice synthesizer 280. Furthermore, even if the vehicle deviates from the traveling route, the control circuit 210 recognizes that the traveling route has deviated from the static information and guidance list information received from the roadside station 1O, and returns to the system center 210.
A route guidance code transmission request is sent to 6. In this way, since the passenger is always navigated along the optimum route by the mobile station 16, there is no need to display a map showing the travel route on the display 25B. Of course, if the passenger desires map information, he or she can obtain the latest map information from the center 26. The received map information is displayed on the display 256 or output by the facsimile device 254.

The mobile station 16 is equipped with a random number table function.According to this, in response to polling from the road station 1O, an available free channel is selected from among a plurality of channels on the link 18 with the road station 1O. Selected by Jl 0. Then, the mobile station 1B performs wireless communication with the roadside station 10 using the selected channel.

Communication between the mobile station 16 of the subscribing vehicle 12 and the base station 1O is carried out by polling in a frame 100 having a format as illustrated in FIG. 4 in this embodiment. 00 has a period of 883 milliseconds (a+S)
A plurality of channels are multiplexed into a large number of time slots included in this. In principle, the required bidirectional communication is completed within this 1 frame period. A single frequency is used for wireless link 18. In the case of full-duplex communication, l pairs of frequencies, which are different from each other on the upper and lower sides, are used. However, those frequencies may be fixed, and zone 2 of any road station
Even if the subscribing vehicle 12 moves to 0, the same frequency is used. In principle, communication is completed within a cycle of 1 frame, but if the amount of information is particularly large, such as image information, or if wireless communication conditions are poor, communication using multiple frames is possible. be.

An introduction section 102 is located at the beginning of the frame 100, and includes a preamble, a synchronization signal, a polling identification signal, a code for static information of the road station 10, and the like. Using this, the road station IO polls the mobile station 16 within the zone 20 at a predetermined period. The mobile station 16 is in the receiving mode in the idle state, and becomes the transmitting mode when it finishes receiving the introduction section 102.

The introduction section 102 is followed by a vehicle recognition section 104, which includes:
Mobile station 1B responds to polling with vehicle specific code 50.
This is the period during which the road station IO recognizes this. Advantageously, by performing two-block repeated transmissions, the recognition rate of participating vehicles 12 is significantly improved. The mobile station 16 selects a channel using a random number table, and uses this channel to transmit the static vehicle-specific code 50 and the dynamic vehicle-specific code 80 to the roadside station 10. The road station IO registers the mobile station 16 if the channel selected by the mobile station 16 can be correctly received without conflicting with other channels.

In this example, the vehicle recognition unit! Following 04, Circular Communication Department 1
06 is arranged, and using this, beacon-type dynamic navigation information such as traffic information and registration response signals (ACK or NACK) are transmitted from the roadside station 10 to the mobile station 16. The roadside station IO sends a signal to the mobile station 16 registered by the vehicle recognition unit 104 to the mobile station 80 by adding channel information to be used by the vehicle communication unit 10B, which will be described later, if necessary.

This is followed by the vehicle communication section 108, whereby full-duplex communication is performed between the road-L station 10 and the mobile station 16 in this embodiment. The frequencies are different for the upper and lower channels, and the channel selected by the roadside station 1O is used. but,
The same frequency is used even when the subscribing vehicle 12 moves to the zone 20 of the adjacent roadside station 10. Of course, half-duplex or unidirectional communication may be used. In the vehicle communication unit 108, the mobile station 16
Data such as guidance codes indicating navigation information and operation management information, messages, and image signals are transmitted and received between the system center 26 and the system center 26, and the information is displayed to the passenger of the subscriber vehicle 12 in the form of images and sounds.

FIG. 6 shows an example of the traveling route of the joining vehicle 12 that has requested the road-to-vehicle system center 2B to send a route guidance code. When the passenger makes a route guidance transmission request from the mobile station MO3 whose mobile station code is Mn2 of the vehicle 12 shown in FIG.
52, a link number code, which is the number of a roadside station 10 at the travel destination, for example, is input. For example, when the link number code of roadside station E is input as the destination, this code is stored in the transmission buffer 220 as the destination code 62 of the dynamic code 60.

When the destination code 62 is input, the control circuit 210
This coat 62 is transmitted to the roadside station 10 that the user passes through first after inputting it. For example, when the mobile station 803 first passes through the transmission area 20 of the roadside station A, the control circuit 210 transmits the dynamic code 60 including the destination code 62 to the roadside station A using the vehicle recognition unit 104. After storing the dynamic code 60 received from the mobile station MO3 in the -H memory 42, the road station A stores the dynamic code 60 received from the mobile station MO3 on the communication line! 11
Send to 122. These codes are swifted through the communication network 22, and a code indicating a request to send route guidance is sent to the road-to-vehicle system center 28.

When the destination of the mobile station M03 is input, the road-to-vehicle system center 26 selects the optimal route to the roadside station E, taking into consideration the traffic flow situation. The center 26 also operates the mobile unit 411 of the mobile station M03 and transmits the guidance code to the roadside station B.
to judge. If the route indicated by the dotted line in FIG. 6 is the optimal route, the guidance code from the road station C to the road station E, which is next to the ground station B which can send the guidance code, is sent to the communication line network 22. . When the roadside station B receives the guidance code addressed to the mobile station MO3, it stores it in the memory 42 and monitors when the mobile station MO3 enters the zone 20.

When the road station B detects the mobile station 803, the LL communication unit +
08, the guidance code addressed to the mobile station MOa is transmitted. When the mobile station MO3 receives the guidance code, the control circuit 210
stores this code in the memory 212 as a guide list as shown on the left side of FIG. In addition, mobile station M03 is informed by road station B, for example, ``If you go straight, there is an oo intersection crossroads 300a+ ahead.If you go straight through the OO intersection, there is a road station F, and if you turn left at the OO intersection, there is a station C.'' Turn right and you will see Road Hi Station K. '', which indicates the surrounding environment of road station B.

The control circuit 210 compares the guidance list with roadside station information and instructs the passenger about the direction of travel. In this case, since the roadside station C is recorded in the guidance list, the mobile station M03 instructs the passenger to turn left at the OO intersection 300ffi ahead. For example, this instruction may be given by the speech synthesizer 280. There is an oO intersection 300 meters ahead, so please turn left there. '' may be voiced to the passenger, or a simple direction of travel instruction may be displayed on the display 256.

At this time, if the driver mistakenly drives straight through the ○○ intersection as shown by the solid line, the mobile station MO3 enters the zone 20 of the roadside station F, and the introduction unit 102 receives the static information thereof. When the control circuit 210 of the mobile station MO3 recognizes that it has deviated from the traveling route by comparing the position information included in the static information of the road-L station F with the guidance list, the control circuit 210 of the mobile station MO3 sends a route guidance transmission request to the road. It is retransmitted to the road-to-vehicle system center 26 within the zone 20 of station F. Road! 1 (the system center 26 is
When receiving a route guidance transmission request, the mobile station M selects a new optimal route in the same manner as described above and uses this as the guidance code.
Send to O3. This guidance code is transmitted to the mobile station M03 by the roadside station G, and is stored in the memory 212 as a guidance list shown on the right side of FIG. ! I get fucked.

When the mobile station M03 receives the surrounding F boundary information transmitted from the road-hi station G, the mobile station M03 instructs the passenger to turn left at the XX intersection, for example. When the mobile station M03 turns left at the XX intersection and enters the zone 20 of the roadside station E, the roadside station E sends a static information code indicating its position information to the mobile station MO3 through the introduction unit 102. The control circuit 210 verifies that the traveling route is correct by comparing the position information of the road-hi station E with the guidance list. Also, based on the surrounding environment information, the next route to be taken is instructed to the passenger in the same manner as described above.

In this way, the mobile station MO3 can pass through the roadside station H and reach the roadside station E, which is the destination.

As described above, according to this embodiment, when the mobile station 16 recognizes that it has deviated from the route, it resends a request for transmitting a route guidance code to the road-to-vehicle system center 26. For this reason, center 2B
There is no need to monitor the running status of the mobile station 16. Therefore, the load on the center 26 can be reduced, and the mobile station 1B can always guide the vehicle 12 to the destination using the optimal route according to the traffic flow situation. Furthermore, in this embodiment, the traffic flow situation can be comprehensively grasped and controlled, so that the traffic flow can be dispersed. In addition, in this example, the destination code is 6.
Although the destination entered in step 2 is the roadside station 10, it may be another destination, such as the prefectural capital or a specific place name. Further, in this embodiment, the driving operation is performed by the passenger, but it is also possible to provide the participating vehicle 12 with an autopilot function and automatically steer the vehicle in accordance with the direction instruction output from the mobile station 18.

An embodiment in which the present invention is applied to a road-to-vehicle individual communication system has been described. However, the present invention is not limited thereto, and can be effectively applied to individual communications with people other than vehicles, such as individuals, that is, pedestrians in a broad sense.

Note that the embodiments described here are for explaining the present invention, and the present invention is not necessarily limited thereto, and modifications and variations that can be made by those skilled in the art without departing from the spirit of the present invention. Modifications are within the scope of this invention.

(Effects of the Invention) As described above, according to the present invention, even if the mobile station deviates from the traveling route, the mobile station detects this and resends the transmission request for the optimal route to the center. Therefore, even if the center does not monitor the traveling route of the mobile station, the mobile station can guide the participating vehicle to the destination. Therefore, the processing load on the center can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a conceptual block diagram showing an embodiment in which the mobile communication system according to the present invention is applied to road traffic for vehicles as a road and vehicle-to-vehicle individual communication system, and FIG. 2 is a road-to-vehicle individual communication system in the embodiment shown in FIG. Figure 3 is an explanatory diagram showing an example of the format of the vehicle-specific code in the same embodiment, and Figure 4 is an explanatory diagram showing an example of the frame format in the same embodiment. FIG. 5 is a functional block diagram showing an example of the configuration of a mobile station in the same embodiment. FIG. 6 is a traveling route diagram showing an example of the traveling route of the joining vehicle in the same embodiment, and FIG. 7 is a list configuration that is an example of changing the guidance list when the traveling route shown in FIG. 6 is changed. It is a diagram. Explanation of the symbols of the main parts 10... Street station! 2. ．． ．． Joining vehicle 14, ... Transmitter/receiver 20, ... Minimum zone 22, ... Road-to-vehicle individual communication network 2B, ... Road (1) system center 42, ... Memory 80, ... Traveling vehicle table 82, ... , passing vehicle table 210, , control circuit 2+2, , memory 252, , key human power device 25B, , CRT display 280,
, Speech Synthesizer Patent Applicant Oki Electric Industry Co., Ltd. Agent Katori Takao Maruyama Takao FF Jj 4 Giant J Garashi 5 L C B Arrangement of P 2 Maju SM Torso Hi's Pugu Machhi Line The 4th row of the stool frame fee i, the 4th row of the middle sword, the 4th row of the middle sword, the 4th row of the upper part, and the 4th row of the upper part. Mu J dark 10

Claims (1)

[Scope of Claims] A plurality of base stations that wirelessly communicate with mobile stations; a communication line network that accommodates the plurality of base stations and exchanges communications for the plurality of base stations; and the communication line network. and a center connected to a center that selects an optimal route according to traffic flow conditions, the base station transmits base station information identifying the base station to the mobile station, and the mobile station transmits route guidance information. When the request is transmitted, the communication line network notifies the center of the transmission request, and upon receiving the transmission request, the center selects an optimal route according to the traffic flow situation and creates an optimal route indicating the optimal route. Sending information to the mobile station via the communication line network, and upon receiving the optimal route information, the mobile station performs route guidance based on the optimal route information and the base station information sent from the base station. When the mobile station verifies the base station information and the optimal route information and recognizes that the mobile station has deviated from the route indicated by the optimal route information, it resends the request to transmit the route guidance information. A route guidance method in a mobile communication system characterized by: