JPH01311630A - System for detection position of mobile station in mobile body communication - Google Patents

Abstract

PURPOSE:To perform communication with a targeted mobile station appropriately by storing transferred information with respect to a position at a registration exchange station corresponding to the identification code of the mobile station. CONSTITUTION:The mobile station 16 loaded on a subscriber vehicle is registered on, for example, an area station 32, and the identification code, i.e. a mobile station code is attached at the area station 32. A road station 10 transfers the data of the subscriber vehicle obtained from the mobile station 16 to an area station 30, the area station 32, or a general station 34 via a line 36. The area station 32 that is a registration station identifies the mobile station 16 being set as an object from the mobile station code, and stores position data at a storage position corresponding to the mobile station on a traveling vehicle table 80, and the data of the present location of the mobile station 16 is always updated. In such a way, the present location of the mobile station changing from time to time can be recognized appropriately, and adequate communication with the targeted mobile station can be always performed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a mobile communication system, more specifically, a system for detecting the position of a mobile station in a mobile communication suitable for communication with a vehicle such as a car. Regarding.

(Prior Art) As a conventional mobile communication system to which the present invention is particularly related, there is, for example, a car telephone system6.As is well known, a conventional car phone system has two base stations covering a predetermined service zone. The base stations are arranged in eight dimensions, with zones of adjacent base stations partially overlapping each other,
Some use a cellular system that guarantees continuity of communication to mobile units.

(Problems to be Solved by the Invention) In the cellular system, different frequencies are used between a plurality of adjacent zones, that is, cells, to avoid radio wave interference. In order to effectively utilize the limited frequency band, it is preferable to subdivide the zone configuration and use the same frequency repeatedly.However, subdivision of the zone configuration reduces the frequency of frequency switching associated with movement across zones. This increases the burden of frequency switching control on both base stations and mobile stations. This tendency becomes more pronounced as the moving speed of a mobile object increases.To solve this problem, in conventional cellular systems, it was necessary to widen each zone or increase the allocated frequency. However, as is well known, increasing frequency allocation is extremely difficult.

Conventional cellular car phone systems are designed primarily for voice communication, so they are not necessarily suitable for services that transmit large amounts of data at high speeds.For example, in land transportation such as automobiles, '+riWI
I In order to perform navigation that guides one to an appropriate route depending on congestion and weather conditions, and to efficiently manage large numbers of people to be transported around the city, a large amount of data is transmitted between the on-board aircraft and the ground (ground-to-ground). It is necessary to transmit data at high speed. Conventional car phone systems are not necessarily suitable for a variety of services, including high-speed data communications, because the frequency of the transmitted signal is limited to the voice band. .

In addition, since the current location of a mobile object cannot be known unless the mobile station receives a call individually, it is not suitable for a user such as a transportation company that owns a large number of cities to efficiently manage the operations of their Ii+ and both vehicles. It wasn't.

Therefore, if multiple base stations that wirelessly link with a mobile station are placed apart from each other with no radio waves interposed between adjacent base stations, these base stations can transmit a single radio wave as the wireless link radio wave. In such mobile communication systems that may be able to use frequencies, the base stations that can communicate with a mobile station change as the mobile station moves, so it is difficult to properly communicate with the target mobile station. The system must always know the current location of the mobile station.

In view of such demands for mobile communication, the present invention provides a new mobile communication system that enables high-speed communication without occupying many frequencies. The purpose is to provide a station location detection system.

(Means and Effects for Solving the Problems) A mobile station position detection system for mobile communication according to the present invention includes a plurality of base stations each communicating with a mobile station via a wireless link;
a plurality of exchange stations forming a communication line network in which a plurality of base stations are accommodated and exchange communications for these base stations;
Adjacent base stations among the plurality of base stations are spaced apart from each other by interposing an area in which the mobile station does not substantially respond to the radio waves of the wireless link, and the mobile station is located at one of the plurality of switching centers. , is registered in association with an identification code that identifies the mobile station. The mobile station generates an identification code and transmits it to one of the plurality of base stations. When one of the plurality of exchanges receives an identification code from a mobile station via a base station, it adds information regarding the location of the mobile station to the identification code and forwards it to the exchange with which the mobile station is registered. . The registration switching center stores information regarding the transferred location in association with the identification code of the mobile station.

For example, when communicating with a certain mobile station, information regarding the rank stored for the mobile station is referred to in the switching center where the mobile station related to the communication is registered. Therefore, the mobile station communicates with the mobile station through the base station corresponding to this location information.

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

FIG. 2 shows an embodiment in which the mobile communication system to which the present invention is particularly applied is applied to land transportation, particularly [vehicles including 1-vehicle]+4 passage traffic, as a road-to-vehicle individual communication system. In this embodiment, a plurality of roadside stations IO are normally arranged at predetermined intervals, for example, at intervals of several hundred meters to several kilometers, along a local road or expressway. This interval may be set to an appropriate value depending on, for example, 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.

The roadside station IO has a transceiver 14, which is connected to the participating vehicle 1.
Radio waves 18 are transmitted and received between the mobile station mounted on the mobile station 2, that is, the vehicle a machine 18 (FIG. 3), and communication is performed with the 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 arrangement interval of the road F stations IO, and the road stations IO are arranged intermittently. Its diameter may be, for example, on the order of a few 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 roadside station 10, that is, a "no radio wave area", and the vehicle 12 is included in the zone 20. 10 street stations only while you are there
You can communicate with. This communication takes place at high speed.

As will be seen from now on, in this system, the same frequency can be repeatedly and effectively used for adjacent channels 11 and stations 10. Therefore, basically, the road station 10 and the mobile station 1
It is sufficient to use the tun frequency for the entire tree system for the radio link between 6 and 6. For systems that allow full-duplex communication.

]-, a pair of frequencies that are different from each other are used below.

This eliminates the need for frequency zone switching as in conventional cellular systems. Because of these characteristics, this method is called an "intermittent minimum zone method", and the zone 20 is called a "minimum zone".

1 station 10 constitutes a part of a road-to-vehicle individual communication line network 22, and via the line network 22, in this embodiment, a general telephone line network 24, a data exchange network 25 such as a general packet switching network,
Other communication facilities such as system center 2B and user center 28 can be accessed. In this embodiment, the road-to-vehicle individual communication line network 22 has a station hierarchy configuration as illustrated in FIG.
5 and the center 26, 28 and the mobile station 16. This will be explained in detail later.

In such an intermittent minimum zone method, the mobile station 16 and the road
It is possible to increase the speed of communication with the L station IO, and a variety of services including high-speed data communication are provided. For example, navigation that guides participating vehicles 12 such as cars to appropriate routes depending on road congestion and weather conditions;
For the purpose of efficiently managing the entrainment of a large number of vehicles 12, data communication can take place between the centers 26 and 28 and the mobile station 16 via the road-to-vehicle individual communication network 22.

Referring to FIG. 3, the road-to-vehicle individual communication line network 22 in this embodiment includes a district station 30 that accommodates a plurality of roadside stations 10 located in a certain area, and a district station 30 that accommodates a plurality of roadside stations 10 located in a certain area. It has a hierarchical structure consisting of regional inter-regional units 32 and a general bureau 34 which accommodates some of these regional inter-regional units 32. These exchanges 3 including the roadside station 10
0.32.34 is called the ground station. District Bureau 30. In this embodiment, the lines between the regions 32 and the phase W of the general office 34 are relay lines such as trunk lines and diagonal lines! ! A tree-like line network consisting of 36 stations is formed, and a set line network is formed between the central stations 34.

It goes without saying that the present invention is not limited to this network configuration, and may take other configurations such as a local hierarchy structure depending on the road configuration such as a general road or an expressway, or a linear network. stomach.

A relay vj, 38 for the general public telephone line network 24 and the data exchange network 25 is housed in the general office 34, for example. The system center 26 is, for example, an information processing system that processes navigation for the participating vehicle 12. In addition, the user center 2nd is an information processing system that independently manages the transportation of vehicles belonging to a specific user among the subscribed vehicles 12.
is housed in. Of course, these may also be connected to the interregional 32 or district office 30.

The general office 34, interregional office 32, and district office 30 each have a unique office code. Among them, by expressing the codes of the general station 34 and the inter-regional 32 in the station hierarchy structure, the registered ground station code 52 (fourth
) is formed. For subscriber vehicles 12 of large users who quarry a large number of subscriber vehicles 12, a user code specific to that user may be used instead of the local station code.

The mobile station j6 mounted on the joining vehicle 12 is registered, for example, in the region 32, and is given a unique mobile station code 54 in the region 32. Therefore, nationwide, 8 iSts, or 16 mobile stations, have a land station code of 52.
and a mobile station code 54. Note that the participating vehicle 12 may be registered at the general office 34 or the district office 30.

The identification code for identifying the mobile station 16, that is, the vehicle-specific code, is composed of a static code 50 and a dynamic code 60 in this embodiment, as shown in FIG. The static code 50 is a code that identifies the mobile station 16 registered in the inter-region 32, and includes the ground station code 52 and mobile station codes 54 and 5.
and a system code 56 for identifying the system. The system code 56 is a code that specifies this system to distinguish it from other systems, and may be omitted inside this system. I want static code-1! JO is
In addition to functions such as identification numbers for individual mobile stations 16 within the system, general telephone line #124, data exchange 1
There is a close relationship with the numbering system when a call is received from the network 25 or center 26.2 to the mobile station 1 (3).

The mobile station 1G of accession 1tfiII; f12 has a ψ code generator 130 (FIG. 3), which
This is a functional unit that generates the vehicle coat assigned to the vehicle.

This vehicle code includes a ground station code 52 that identifies the registration station where the mobile station 16 is originally registered, and a mobile station code 54 of the mobile station 16. These codes are generated by the vehicle code generator 130. road station I, which will be described later.
It is read from this and transmitted in response to the ball leg from O.

For example, as shown in FIG. 1, one 11! ! Mobile station 1 in area station Bl
6 is registered. The ground station code 52 that specifies the region 32 is r A + B (J, and the mobile station code rsa of the mobile station 16 within the region is r
Mo3J, the mobile station has a static double code 1:r
It is specified by A+B+Mo3J.

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 a code unique to the general telephone line 24, data exchange, network 25, etc.
The vehicle 41 plays an important role in searching for locations for individual communication from the vehicle and center 26, 28, providing route guidance information to the travel destination of the subscriber vehicle 12, etc. Therefore, in this embodiment, the subscriber vehicle 12 The driving location code 84, which includes a destination code 62 indicating the destination of the person to be taken, and a driving area code 64 indicating the current driving area, is transmitted to the general office 34, the interregional 3
2 and 30 district courts. In addition to this, a link code that specifies the set communication link may also be included.

In this embodiment, as shown in FIG.
0 is prepared for 32 between regions. Traveling vehicle μ → The table 80 stores data indicating the current driving area of the participating vehicles 12 of the local station registered as belonging to the area 32, by local area. Data on participating vehicles 12 traveling in the area are stored for each registration station. These data in the traveling 1V table 80 are constantly updated. Similar vehicle tables may be provided at the district office 30 and the general office 34, for example.

As conceptually shown in FIG. 2, the road station 10 has a memory 42.
is arranged, which is a passing vehicle table 82 (FIG. 3).
It also includes a storage area in which information to be transmitted and received with the mobile station 16 is stored. The passing vehicle table 82 is a road station IO
It holds data regarding the additional loads 12 that pass through the minimum zone 20 of . These data are vehicle specific code 50
and 60, and is constantly updated as the participating vehicle 12 passes.

In this embodiment, the mobile station 16 is a member vehicle 12 such as a car.
It is installed in
or) a multiplexing device d for audible display. Preferably,
It is equipped with a video display, a facsimile transmitting/receiving device, a voice synthesis device, etc. that provides images and audio to the passengers. Further, it may have an automatic entrainment control function for the control mechanism of the joining vehicle 12. The mobile station 1B has a random number table function, and according to this function, the mobile station 1B
In response to polling from 0 to 15, an available free channel is selected by the road 4 station 10 from among a plurality of channels on the link 18 between the road station 10 and the road station 10.

In this embodiment, communication between the mobile station 16 of the participating vehicle 12 and the base station IO is carried out by polling using a frame 100 having a format as illustrated in FIG. In this example, frame 100 has a period of 683 milliseconds (ms).
, the transmission rate is 512 bits/second, and multiple channels are multiplexed into a number of time slots.

In principle, the required bidirectional communication is completed within this one frame period. A medium frequency is used for the radio link 18. In the case of full-duplex communication, a pair of frequencies that are different in frequency are used for the upper and lower sides. However, 1. Those frequencies may be fixed, and the vehicle 12 that joins the zone 20 of 3 laps on any road
The same frequency is used even if the

An introduction section 102 is located at the beginning of the frame 100.

This includes a preamble, a synchronization signal, a polling identification signal and a line-station code, etc.

Using this, the mobile station 10 is linked to the mobile station 16 in the SO-720 at a predetermined period, as shown in FIG. 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 fixed code 1 code 5.
0 and 60 are transmitted and the roadside station 10 recognizes them. Advantageously, by performing two-block repeated transmissions, the recognition rate of the participating vehicle 12 is greatly improved.

Mobile station 16 selects one of the plurality of channels from a random number table in response to polling. In response to the polling, the vehicle code generator 130 of the mobile station 18 generates the ground station code 52 that is set and registered in the mobile station 16.
A mobile station code 54 is generated and transmitted to the road station 10 as a static vehicle-specific code 50 or a service function code using this channel (see FIG. 6).

For example, in the example shown in FIG. 1, it is assumed that one district station C1, which is housed in a regional station AoB, accommodates eight road stations IO, and station codes no-Dy are assigned to each of them. The sixth roadside station 10 from the left in the figure is designated by the station code rAoB+G+DsJ.

In this example, rAIB+Mo as static vehicle code 50:
When the mobile station 16 with +J is polled from now on while passing within the zone 20 of the road station AoBIC ID5,
The mobile station 16 has a ground station code 52 and a mobile station code 54.
The identification code rAIBIM63J is returned.

Returning to FIG. 5, in this embodiment, a relay communication section 10B is arranged following the vehicle recognition section 104, and is used to communicate with road stations.
Beacon-type dynamic navigation information such as traffic information and a registration response signal (ACK or NACK) are transmitted from O to the mobile station 16. If the channel selected 17 by the mobile station 16 does not conflict with any other channel, it is registered with the path 1-station 10 and an AGK signal is transmitted to the mobile station 16.

This is followed by the duplex communication section 108, whereby full-duplex communication is performed between the road station IO and the mobile station 1B in this embodiment. The frequencies are different for the upper and lower channels, and the channel designated by the road station 10 is used. However, even if the subscribing vehicle 12 moves to the seesaw 20 of the adjacent roadside station 10, the same frequency is used. Of course, half-duplex or unidirectional communication may be used. In the vehicle communication unit 108, data such as navigation information and entrainment management information, messages, and image signals are transmitted and received between the mobile station 16 and the system center 26 and the user center 28, and the information is transmitted to the passenger of the subscriber vehicle 12. Displayed as images and sounds. Furthermore, communication with the general telephone line network 24, data exchange network 25, or other mobile stations 16 within this system is performed in the same manner.

In this way, the roadside station 10 temporarily holds the data of the participating vehicles 12 obtained from the mobile station 16 in the zone 20 in the passing vehicle table 82 for each polling cycle, and also
6 to the district office 30, regional office 32 or general office 34. These stations store the thus transferred data in, for example, a running vehicle table 80. In this way, for example, the traveling vehicle table 80 between regions 32 is constantly updated with new data.

To explain in more detail, as shown in Figure 3, the district office 30
is equipped with a station code generation section 132 that generates a ground station code 52 that specifies the district station 30.

For example, the district station AoB+C+ in FIG.
J is set. The road-L station AoB+ (mobile station 16 received at +D5) vehicle code rAl+Mo:+J is temporarily stored in the passing vehicle table 82 of the third lap 10 of that road, and then transferred to the upper district station AoB+C:+. Ru. As shown in FIG. 6, the district station AOBICI identifies from this vehicle code rA+B+Moa J that the registered station is an inter-area AIB+ belonging to the central station A1, and transfers the vehicle code rAIBIMO3J to the inter-area AIB+. At this time, the district station AOBICI transmits its own identification information as information indicating the current location of the mobile station 16. To this may be added the identification information of the roadside station D5, which location information includes its ground station code rAoB+c+J in the form of the driving area code 64 of the dynamic vehicle code 60.

Exchanges located above the district station AOBICI, such as interregional A and B, and central stations Ao and AI, use the vehicle code rA4BIMo3J of the mobile station location data to be transferred.
and relays it to its registration authority, ie, the Interregional AIB in this example. Registration Authority AI
B+ is mobile station location data, i.e. static vehicle code 5
0 and the dynamic vehicle code 60, the target mobile station 16, that is, the station MO3 in this example, is identified from the mobile station code 54, and the moving vehicle table 80 is identified.
These position data are stored in storage locations corresponding to those of the .

The current location data of the mobile station 16 is constantly updated.

Focusing on a specific mobile station, for example MO3, its location data is transmitted to the district station 30 as described above each time any road station IO detects the mobile station MO3.
is reported to the registration station AIB+, and the traveling vehicle table 80
The stored contents of mobile station 803 are updated. Or, when any of the district stations 30 detects the mobile station MO3 for the first time via the route 11 station 10 within its jurisdiction, the registered station A
It may be configured to report this to IB+.

centers 26, 28, general telephone network 24, data exchange,
! The information addressed to the mobile station 16 from +125 is temporarily stored in the memory 42 of some ground station, for example, the roadside station 10. The roadside station 10 compares the static vehicle-specific code 50 obtained from the mobile station 1B within its jurisdiction with the destination code of the transmission information, and determines whether there is information to be transmitted to the mobile station 16. When a match is detected between the two, the information stored in the memory 42 is transmitted to the mobile station 16 using the downlink channel of the vehicle communication section 108. Information transmitted from the mobile station 16 by the t-rechannel is temporarily stored in the memory 42. This transmission information is later sent to the center 26, 28 via the road-to-vehicle individual communication network 22.
The data is transferred to the data exchange network 25 or the general telephone line network 24.

When the lj and both communication units 108 complete, the communication completion unit 110 sends the response signal shown below. This is a signal confirming the completion of the transmission, not confirmation of the information content.

In this way, one frame 100 of communication is performed while the participating vehicle 12 is traveling within the service zone 20 of the road-L station 10. While the subscribing vehicle 12 is traveling in a radio waveless area between two adjacent zones 20, the mobile station 16 cannot communicate with the road-to-vehicle individual communication network 22.

Using a single frequency may evoke traditional leaky coaxial cable broadcast systems. However, this embodiment is not a broadcasting system but an individual communication system, and is fundamentally different from a leaky coaxial cable broadcasting system in that there is no radio wave area.

In principle, this embodiment is configured such that one communication is completed while the joining vehicle 12 is included in a certain minimal learn 20. Regardless of whether it is a general road or an expressway, as long as the vehicle is driving normally on that road, the vehicle 1 that has joined several minimal zones 20 across the above-mentioned no radio wave area.
Roadside stations 10 are arranged along the road at such intervals that a considerable amount of communication can be carried out by traveling of the roadside stations 10. In other words, due to such a remote arrangement of the roadside stations 1O, the mobile station 1 with a large amount of communication traffic
2, it is possible to sufficiently achieve the required communication.

Now, using the mobile station position data that is constantly updated at the registered station AIB+, the mobile station AI is
The sequence of arriving at BIMQ3 will be schematically explained with reference to FIG. Mobile station A from center 26 or 28
Messages addressed to +B+MQ3 have the destination code r
Registration station AIB via the central office 34 with a header in the form of a static vehicle-specific code 50 containing AIB+Mo3J.
Sent to +. This message transfer is performed by identifying the destination code r A+B+Mo11J of the message at each relay station. When the registration station AIB receives this message together with the header, it checks the registration qualification of the receiving mobile station AIBIMO3 based on the destination code, and if the qualification is satisfied, stores the message in a memory (not shown). Although not shown in the figure, at this time the registration station AIB+ returns a reception confirmation response to the center 26 or 28 (140).

Therefore, the registration station AIBI refers to the running vehicle table 80, and from the mobile station position data, the registration station AIBI
Check the current position of 3. As a result, the mobile station AIBIMO
When the current location of vehicle 3 is found to be, for example, rAoB+c+J, the registration station A+8+ creates a dynamic vehicle-specific code 60 that includes the address rAoB+G+J of the district office 30 as the driving location area code θ4. Registration Authority AIB
+ reads the transmitted message from memory, adds a dynamic code 60 to its header, and transmits it to district station AoB+(+).

Relay stations such as the central station 34 and the regional stations 32 identify the dynamic vehicle-specific code θ0 of the message and forward it to the target local station AoB+C+. District station Ao Bl c+
When receiving this message together with the header, it broadcasts the message to all the road stations 10 accommodated therein. This circular includes a delivery request, a message, and the message's destination code rA+B+Noz J. Upon receiving this, the 6-way station IO stores the message in the -H memory 42 and sends the message within its service zone 20. The mobile station 16 included in the mobile station 16 is polled. This polling is performed at the introduction section 102 of the frame 100 as described above.

Active mobile stations 16 included within the service zone 20 of the station 10 on the road generate vehicle codes 50 and 60 in a vehicle code generator 130 in response to this polling;
This is sent back to the roadside station 10. This is the vehicle recognition unit 104
is used. The road station IO temporarily stores the vehicle code returned from the mobile station 16 in the transit vehicle table 82, and compares the static vehicle-specific code 50 with the destination code rA+B1MoaJ of the message (142). If the two match at the road station 10, that station 10
reads the transmission message from the memory 42 and transmits it on the channel of the mobile station AIBIMO3 using the vehicle communication section 108. Mobile station AIBIM that received the message
O3 uses the communication completion unit 110 to return a reception confirmation response, which is ultimately transferred to the registration station 34 via the ground station. If the reception acknowledgment includes an acknowledgment ACK,
District station AoB+C:+ cancels the delivery request to another road station IO.

The remaining road-E stations IO for which no vehicle code match occurred in step +42 are under the control of the district station AoB+C+.
The message stored in the memory 42 is discarded, and this process ends. It should be noted that each station returns an acknowledgment response at each stage of this mobile station incoming sequence, but this is not shown in FIG. 7 to avoid complication of the diagram.

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 communication with any moving object other than a vehicle, such as an individual, ie, a pedestrian 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.
■ Possible variations and modifications are included within the scope of the present invention.

(Effect of the invention) Akira Kimuro's mobile communication mobile station position detection system is
In such an intermittent minimum zone method, the current position of the mobile station, which changes from moment to moment, can be appropriately recognized. This allows appropriate communication with the target mobile station at all times as long as it is active. This system also provides a variety of services, including high-speed communications, without occupying many frequencies.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram conceptually showing a mobile station position detection system for mobile communication according to the present invention, and FIG. 2 is an example in which the mobile communication system, which is the subject of the present invention, is applied to road traffic for vehicles. Fig. 3 is a conceptual block diagram showing an example of the station hierarchy configuration of the road-to-vehicle individual communication line network in the embodiment shown in Fig. 2; FIG. 5 is an explanatory diagram showing an example of the format of a vehicle-specific code in the embodiment. FIG. 5 is an explanatory diagram showing an example of the frame format in the same embodiment. FIG. 6 is a sequence diagram showing an example of a sequence for detecting the position of a mobile station in the same embodiment, and FIG. 7 is a sequence diagram showing an example of a sequence of receiving a call to a mobile station. Explanation of symbols of main parts io Roadside station 12, Subscribing vehicle 14, Transmitter/receiver 20, Minimum zone 22, Road-to-vehicle individual communication network 30.32, 34 , Switching station, Landing station 42 , Memory 80 , Traveling vehicle table 82 , Passing vehicle table 130 , Vehicle code generation section 132 , Station code generation section report A 1 I R PE 5F day? (艮, 9 doors q middle day 1 code no oma/Y example 4th figure q

Claims (1)

[Claims] A plurality of base stations each communicating with a mobile station via a wireless link, and a plurality of base stations forming a communication line network accommodating the plurality of base stations and exchanging communications for the plurality of base stations. a switching center, and adjacent ones of the plurality of base stations are spaced apart from each other with an area interposed therebetween in which the mobile station does not substantially respond to radio waves of the wireless link, and the mobile station is registered in one of the plurality of switching centers in association with an identification code that identifies the mobile station, and the mobile station generates the identification code and transmits it to one of the plurality of base stations. , upon receiving the identification code from the mobile station via the base station, the switching center adds information regarding the location of the mobile station to the identification code and transfers it to the registered switching center; A mobile station position detection system for mobile communication, characterized in that information regarding the transferred position is stored in correspondence with an identification code of the mobile station.