JP2670087B2 - Mobile station location detection system for mobile communications - Google Patents

Description

The present invention relates to a mobile communication system, and more specifically to a system for detecting the position of a mobile station in mobile communication suitable for communication with a vehicle such as an automobile. Regarding

(Prior Art) As a conventional mobile communication system particularly related to the present invention, there is, for example, an automobile telephone system. As is well known, in a conventional car telephone system, base stations covering a predetermined service zone are two-dimensionally arranged, and the zones of adjacent base stations partially overlap with each other.
Some have adopted a cellular system that guarantees continuity of communication with a mobile body.

When making a call to the mobile station, it is necessary to identify the current position of the mobile body. In a conventional cellular car telephone system, each time a mobile station receives an incoming call, the network side makes a simultaneous call to multiple zones, and by detecting the response from the mobile station, the current position is grasped and the incoming call connection is established. I was doing.

(Problems to be Solved by the Invention) In the cellular system, different frequencies are used between a plurality of adjacent zones, that is, cells, in order to avoid radio wave interference. In order to effectively use the limited frequency band, it is preferable to subdivide the zone configuration and use the same frequency repeatedly. However, the subdivision of the zone structure increases the frequency of frequency switching accompanying movement across the zones, and imposes a frequency switching control burden on both the base station and the mobile station. This tendency becomes more remarkable as the moving speed of the moving body increases. In order to solve this problem, in the conventional cellular system, it is necessary to widen each zone or increase the assigned frequency. However, as is well known, increasing the frequency allocation is very difficult.

The conventional cellular car telephone system is designed mainly for voice communication, and is not necessarily suitable for the service purpose of transmitting a large amount of data at high speed. For example, in land transportation such as automobiles, in order to efficiently manage the navigation that guides the route to an appropriate route according to the road congestion and weather conditions, and the efficient management of the operation of a large number of vehicles, the It is necessary to transmit a large amount of data at high speed. The conventional car telephone system is not necessarily suitable for various services including such high-speed data communication because the frequency of the transmission signal is limited to the voice band.

In addition, each time a call is received, a paging call is made from each base station, and the mobile station responds to the incoming call before making a call connection. Therefore, connection control of the call is complicated, and a relatively long connection setup time is required. It was Furthermore, since the current position of the mobile body cannot be grasped unless the mobile station individually receives the call, it is not suitable for a user having many vehicles such as a carrier to efficiently manage the operation of those vehicles. .

Therefore, multiple base stations wirelessly linked to the mobile station
If the base stations are separated from each other by interposing a radio-free area between the base stations, these base stations will be able to use a single frequency as a radio wave of the radio link. In such a mobile communication system, the base station that can communicate with the mobile station changes with the movement of the mobile station. Therefore, in order to properly communicate with the target mobile station, the system must be the current mobile station. It is necessary to keep track of the position. However, knowing the current location of the mobile station would not guarantee that it is actually there when an incoming call to it occurs. Particularly, in the case of a system applied to a general road, the movement of a moving body is two-dimensional, and it will be difficult to accurately predict the movement and perform effective incoming call control. In addition, it is not preferable that the traffic concentrates on the communication for grasping the position of the mobile station, and this hinders the communication traffic of the entire system.

In view of the demand for such mobile communication, the present invention has
It is an object of the present invention to provide a mobile station position detection system that enables appropriate communication with a mobile station.

(Means and Actions for Solving the Problems) According to the present invention, a plurality of base stations that each wirelessly communicate with a mobile station, and a communication network that accommodates the plurality of base stations and exchanges communication with these base stations. In a mobile station position detection system for mobile communication including a plurality of exchange stations forming a mobile station, the mobile station is registered in any of the plurality of exchange stations, and among the plurality of base stations, locally related stations are grouped together. A switching center that forms a group and is accommodated in one of a plurality of switching centers and that accommodates a base station that forms a group detects that a mobile station is first detected in the area by any of the base stations that form this group. , The location of the detected mobile station is notified to the registered exchange of the mobile station, and the registered exchange of the mobile station stores the reported location of the mobile station.

The switching center with which the mobile station is registered holds the current position data of the mobile station and constantly updates it in real time. Since the notification of the current position is limited only when the mobile station is detected for the first time in the area, the communication traffic for the current position notification is small, and the communication track of the original information is not hindered thereby.

For example, when communicating with a mobile station, the location stored for that mobile station is obtained at the switching center to which the mobile station associated with that communication is registered. Then, the base station near this position communicates with the mobile station. In this way, as long as the target mobile station is active, it can be efficiently terminated.

INDUSTRIAL APPLICABILITY The present invention is applied to a new mobile communication network system in which the current position of a mobile station is managed by a registration station, and is a new concept that has never existed before.

(Embodiment) Next, an embodiment of a mobile station position detecting 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 traffic, particularly road traffic of vehicles including automobiles, as a road-to-vehicle individual communication system. In this embodiment, a plurality of roadside stations 10 are normally arranged along a general road or a highway at a predetermined interval, for example, several hundred meters to several kilometers. This interval may be set to an appropriate value according to the vehicle speed allowed on the road, for example. The road station 10 is a ground station that functions as a base station that wirelessly communicates with the subscribing vehicles 12 on the road.

The roadside station 10 has a transmitter / receiver 14, which transmits and receives radio waves 18 to and from a mobile station mounted on the subscribing vehicle 12, that is, a vehicle-mounted device 16 (FIG. 3), and its service area or zone.
It communicates with the vehicle 12 existing within 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 roadside stations 10 and the roadside stations 10 are intermittently arranged. Its diameter may be, for example, on the order of tens of meters to 100 meters. Therefore, between the two adjacent zones 20, there is an area where the mobile station 16 does not substantially respond to the radio wave transmitted by the road station 10, that is, a “radio-free area”, and the vehicle 12 is included in the zone 20. It is possible to communicate with the roadside station 10 only while it is present. This communication is performed at high speed.

As can be seen, in this system, the neighboring road station
The same frequency can be effectively used repeatedly for 10. Therefore, it is basically sufficient for the radio link between the roadside station 10 and the mobile station 16 to use a single frequency throughout the system. In the case of a system that enables full-duplex communication, a pair of frequencies that are different from each other above and below are used. This eliminates the need for frequency zone switching as in the conventional cellular system. Based on these characteristics, this method is called “intermittent minimum zone method”, and zone 20 is called “minimum zone”.

The roadside station 10 constitutes a part of the road-to-vehicle individual communication network 22,
In this embodiment, through the same line network 22, a general telephone line network 24,
Other communication facilities such as a data switching network 25 such as a general packet switching network, a system sensor 26 and a user center 28 can be accessed. In the present embodiment, the road-vehicle individual communication network 22 has a station hierarchy configuration as illustrated in FIG.
General telephone line network 24, data exchange network 25 and centers 26, 28
Is a communication network that performs switching, that is, exchange between the mobile station 16 and the mobile station 16. This will be described in detail later.

In such an intermittent minimum zone system, communication between the mobile station 16 and the roadside station 10 can be speeded up, and various services including high speed data communication can be provided. For example,
For the purpose of navigation that guides the subscribing vehicle 12 such as a car to an appropriate route according to road congestion and weather conditions, and for the purpose of efficiently managing the operation of a large number of vehicles 12, through the road-vehicle individual communication network 22. Data communication can be performed between the centers 26 and 28 and the mobile station 16.

Referring to FIG. 3, the road-to-vehicle individual communication network 22 according to the present embodiment includes a district station 30 accommodating a plurality of road stations 10 arranged in a certain area and a region including the plurality of district stations 30. It has a tiered structure composed of regional stations 32 that are housed over the entire area and a general station 34 that houses several of these regional stations 32. These exchanges 30, 32, 34 including the roadside station 10 are referred to as ground stations. In this embodiment, the line between the district station 30, the regional station 32, and the general bureau 34 forms a tree network consisting of trunk lines 36 such as trunk lines and diagonal lines.
A network type network is constructed between the two. It is needless to say that the present invention is not limited to this network form, and may have a local hierarchy structure according to the road form such as an ordinary road or an expressway, and other forms such as a linear network. Yes.

The trunk line 38 for the general public telephone line network 24 and the data exchange network 25 is accommodated in the general bureau 34, for example. The system center 26 is, for example, an information processing system that processes navigation of the joining vehicle 12. User Center 28
Is an information processing system that independently manages the operation of the participating vehicles 12 belonging to a specific user. Both are housed in a general bureau 34 by a trunk line 40. Of course, these may be connected to the regional office 32 or the regional office 30.

The general bureau 34, the regional bureau 32, and the district bureau 30 each have a unique bureau code. By representing the codes of the general bureau 34 and the regional station 32 among them in the station level structure, the registered ground station code 52 (FIG. 4) for identifying the regional station 32 is formed. For a large number of users' vehicles 12 that have a large number of vehicles 12, a user code specific to the user may be used instead of the regional station code. The mobile station 16 mounted on the subscribing vehicle 12 is registered, for example, in the regional station 32, and is given a unique mobile station code 54 in the regional station 32. Therefore, nationwide, the on-vehicle device, that is, the mobile station 16 is specified by the ground station code 52 and the mobile station code 54.
The joining vehicle 12 may be registered in the general bureau 34 or the district bureau 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. Static code 50 is regional station 32
The code is a code that identifies the mobile station 16 registered in, and includes a ground station code 52 and a mobile station code 54, and a system code 56 for identifying this system. The system code 56 is a code for designating the present system distinguished from other systems, and may be omitted inside the present system.
Therefore, in addition to the function as the identification number of each mobile station 16 inside the system, the static code 50 is added to the mobile station 16 from the general telephone line network 24, the data exchange network 25 or the centers 26 and 28. It is closely related to the number system of.

The mobile station 16 of the joining vehicle 12 has a vehicle code generator 130 (third station).
), Which is the functional part that generates the vehicle code assigned to that mobile station 16. This vehicle code contains
It includes a ground station code 52 that identifies the registration station with which the mobile station 16 was originally registered, and a mobile station code 54 of the mobile station 16. These codes are set in the vehicle code generator 130, and are read and transmitted in response to polling from the roadside station 10 described later.

For example, as shown in FIG. ₁ , it is assumed that the mobile station 16 in _one regional station B ₁ accommodated in the general bureau A ₁ is registered. The ground station code 52 that identifies the regional station 32 is "A
₁ B ₁ ”, and the mobile station code 54 of the mobile station 16 in the regional station is“ M ₀₃ ”, the mobile station is identified by the static vehicle code“ A ₁ B ₁ M ₀₃ ”. It

The dynamic code 60 is a code corresponding to the moving state of the joining vehicle 12, and is effectively used for grasping the current situation of the joining vehicle 12 and navigating. Therefore, the joining vehicle 12
This is a vehicle-specific code related to the travel area and travel conditions of the general telephone line network 24, data exchange network 25, center 26,
Search for vehicle location for individual communication from 28, joined vehicle 12
Plays an important role in providing route guidance information to other travel destinations. Therefore, in the present embodiment, a destination code 62 indicating the operation destination of the joining vehicle 12 and a travel destination area code 64 indicating the current travel destination area are included. Driving area code 64
Consists of station codes of the general bureau 34, regional bureau 32 and district bureau 30. In addition, a link code for specifying the set communication link may be included.

In this embodiment, as shown in FIG.
80 are provided in the regional office 32. In the traveling vehicle table 80, data indicating the current traveling area of each of the participating vehicles 12 of the own station registered as belonging to the local station 32 is stored for each station area. Data on the subscribed vehicles 12 traveling in the area is stored for each registration authority. These data in the traveling vehicle table 80 are constantly updated. Similar vehicle tables may be provided, for example, at the district office 30 and the general office 34.

In this embodiment, the passing vehicle table 170 is also provided in the memory of the district station 30. The passing vehicle table 170 is a table that stores data of the mobile station 16 detected in the service zone 20 of all the roadside stations accommodated in the district station 30. In this embodiment, only when the mobile station 16 that has entered the service area of the district station 30 is detected for the first time in the service area, communication for reporting the current position is performed to the registered station. As a result, the communication traffic for reporting the current position of the mobile station 16 can be reduced, and the traveling position management process at the registration station is simplified. This passing vehicle table 170 is a
Reference is made to determine whether the mobile station 16 reported detection from 0 is a station that has newly entered the jurisdiction of the district station 30. Further, when the broadcast group configuration of the roadside station 10 is not taken for an incoming call, it is also used to find out the roadside station 10 that can make an incoming call to the mobile station 16.

As conceptually shown in FIG. 2, the roadside station 10 is provided with a memory 42, which includes a passing vehicle table 82 (FIG. 3),
It includes a storage area in which information to be transmitted to and received from the mobile station 16 is stored. The passing vehicle table 82 holds data on the joining vehicles 12 passing through the minimum zone 20 of the road station 10.
These data include vehicle specific codes 50 and 60,
It is constantly updated with the passage of the subscribing vehicle 12.

In this embodiment, the mobile station 16 is mounted on a subscribing vehicle 12 such as an automobile, transmits and receives data such as navigation information and operation management information, messages and image signals to and from the road station 10, and transmits these signals to the passenger. Visible and / or
It is an in-vehicle device that performs audible display. Preferably, it is provided with a video display, a facsimile transmitting / receiving device, a voice synthesizing device, and the like that interface with the passengers by images and voice. Further, an automatic operation control function for the control mechanism of the joining vehicle 12 may be provided. The mobile station 16 has a random number table function, and in response to polling from the roadside station 10, among the plurality of channels in the link 18 with the roadside station 10, an available free channel is selected by the roadside station 10. .

Communication between the mobile station 16 of the subscribing vehicle 12 and the base station 10 is carried out by polling with a frame 100 having a format as shown in FIG. 5 in this embodiment. In this embodiment,
Frame 100 has a cycle of 683 milliseconds (ms) and a transmission rate of 512K
At bits per second, multiple channels are multiplexed into the multiple timeslots they contain. In principle, required bidirectional communication is completed within this one frame period. A single frequency is used for wireless link 18. In the case of full-duplex communication, a pair of frequencies that are different from each other at the top and bottom are used.
However, those frequencies may be fixed, and the same frequency is used regardless of which on-road station 10 zone 20 the joining vehicle 12 moves to.

At the beginning of the frame 100 is an introductory part 102, which is
It includes a preamble, a synchronization signal, a polling identification signal, a code of the roadside station 10, and the like. Road station 10 using this
Polls the mobile station 16 in the zone 20 at a predetermined cycle, as shown in FIG. The mobile station 16 is in the reception mode in the idle state, and is in the transmission mode after the reception of the introduction unit 102 is completed.

The introduction 102 is followed by the vehicle recognizer 104, which includes the vehicle-specific codes 50 and 60 in response to the mobile station 16 polling.
Is transmitted and the roadside station 10 recognizes this. Advantageously, by performing the two-block repetitive transmission, the recognition rate of the joining vehicle 12 is significantly improved. The mobile station 16 selects one of the plurality of channels from the random number table in response to the polling. In response to the polling, the vehicle code generation unit 130 of the mobile station 16 generates the ground station code 52 and the mobile station code 54 registered to the mobile station 16 which are set to this,
The static vehicle specific code 50 and the service function code are transmitted to the roadside station 10 using this channel (see FIG. 6).

For example in the example of Figure 1, housed local station A ₀ B ₁ housed in which one of the eight paths station 10 to the district station C ₁ to is the station in which the code D ₀ to D ₇ are assigned respectively And The sixth road station 10 from the left in the figure is designated by the station code “A ₀ B ₁ C ₁ D ₅ ”. In this example, the mobile station 16 having “A ₁ A ₁ M ₀₃ ” as the static vehicle code 50 is the on-road station A ₀ B ₁ C
_When being polled while passing through the ₁ D ₅ zone 20, the mobile station 16 returns the identification code "A ₁ B ₁ M ₀₃ " as the ground station code 52 and the mobile station code 54.

Returning to FIG. 5, in the present embodiment, a broadcast communication unit 106 is arranged following the vehicle recognition unit 104, and using this, a beacon type dynamic navigation information such as traffic information from the roadside station 10,
And a registration response signal (ACK or NACK) is transmitted to the mobile station 16. If the channel selected by the mobile station 16 does not collide with others, it is registered in the roadside station 10 and an ACK signal is transmitted to the mobile station 16.

After that, the vehicle communication unit 108 follows, and in this embodiment, full-duplex communication is performed between the roadside station 10 and the mobile station 16. The frequencies are different from each other in the upper and lower sides, and the channel designated by the roadside station 10 is used. However, even if the joining vehicle 12 moves to the zone 20 of the adjacent road station 10, the same frequency is used. Of course, half-duplex or one-way communication may be used. In the vehicle communication unit 108, the mobile station 16 and the system center 26
Data such as navigation information and operation management information, messages and image signals are transmitted and received to and from the user center 28, and the information is displayed to passengers of the subscribing vehicle 12 as images and voice. Communication with the general telephone line network 24, the data exchange network 25, or another mobile station 16 in the present system is also performed in the same manner.

In the road station 10, the zone is thus set for each polling cycle.
Data of the subscribed vehicle 12 obtained from the mobile station 16 in 20 may be stored in the passing vehicle table 82. The roadside station 10 transfers these data to the district station 30 via the line 36. In this embodiment, when the local station 30 detects a specific mobile station within the service area, for example, A ₁ B ₁ M ₀₃ for the first time in the service area via the on-road station 10 in the service area, the local station 30 transmits to the registration station A ₁ B ₁ . It is configured to report this.

As shown in FIG. 8, for example, mobile station A ₁ B ₁ M ₀₃
Continue to drive at 36, and on-road station A ₀ B ₁ C ₁ D ₇ at the end of district station A ₀ B ₁ C _1.
It passes through the first path station A ₀ of the other adjacent district station A ₀ B ₁ C ₂
Assume that you are in zone 20 of B ₁ C ₂ D ₀ . This road station A ₀ B ₁ C ₂
D ₀ reports the vehicle code 50 of mobile station A ₁ B ₁ M ₀₃ to its superior district station A ₀ B ₁ C _2, which district station A ₀ B ₁ C ₂ remembers in transit vehicle table 170. To do. At that time, the regional office A ₀ B ₁ C ₂ checks whether or not this vehicle code “A ₁ B ₁ M ₀₃ ” has been stored in the passing vehicle table 170 so far (172, No. 6).
Figure). If it is determined that it has not been stored, it is determined that the mobile station in the zone 20 has been detected for the first time in the jurisdiction of the district station 30,
The current position data is transferred to the registration station A ₁ B ₁ through the upper regional station A ₀ B ₁ . In this case, the current location data is 30
Station codes up to "A ₀ B ₁ C ₂ " are sufficient.

More specifically, as shown in FIG.
Has a station code generator 132 that generates a ground station code 52 that specifies the district station 30. The district station A ₀ B ₁ C ₂ has “A ₀ B ₁ C ₂ ” set as the ground station code 52 in the station code generation unit 132. Mobile station 16 received by road station A ₀ B ₁ C ₂ D ₀
The vehicle code "A ₁ B ₁ M ₀₃ " is temporarily stored in the passing vehicle table 82 of the on-road station 10 and is transferred to the upper district station A ₀ B ₁ C ₂ .

When the district station A ₀ B ₁ C ₂ determines that the vehicle code “A ₁ B ₁ M ₀₃ ” has not been stored in the passing vehicle table 170 (172), as shown in FIG. The vehicle code "A ₁ B ₁ M ₀₃ " identifies that the registration station is the regional station A ₁ B ₁ belonging to the general station A ₁ and transfers it to the regional station A ₁ B ₁ . The first regional station A ₀ B ₁ C ₂ transmits its own location information as information indicating the current location of the mobile station 16.
This position information is the driving area code of the dynamic vehicle code 60.
64, including its ground station code "A ₀ B ₁ C ₂ ".

District station A ₀ B ₁ switching center in the C ₂ of the upper, for example local stations A ₀
B ₁ and the general bureaus A ₀ and A ₁ identify their destinations based on the vehicle code “A ₁ B ₁ M ₀₃ ” of the mobile station position data to be transferred, and their registration stations, that is, regional stations A _{1 in} this example. Relay this to B ₁ . Registration station A ₁ B ₁ is mobile station position data,
That is, when the static vehicle code 50 and the dynamic vehicle code 60 are received, the target mobile station 16, that is, the station M ₀₃ in this example, is identified from the mobile station code 54, and corresponding to that of the traveling vehicle table 80. These position data are stored in the storage positions to be stored. In this way, the traveling vehicle table 80 of the registration station A ₁ B ₁ is constantly updated with new data. In this system, the base station is connected via each roadside station 10 within the jurisdiction of
Among the mobile stations detected in 30, the communication for reporting the current position of the mobile station newly detected in this area occurs.Therefore, the communication between the exchange and the registered station that detected the mobile station is performed. Less traffic is required, and the traveling position management process at the registration station is simplified.

The current position data of the mobile station 16 is constantly updated. Particular mobile station, for example, when focusing on the M _03, the position data, for example, when any one of the district station 30 detects the first mobile station M ₀₃ through the streets station 10 in the tube section station as described above The information is reported from 30 to the registration station A ₁ B _1, and the stored content of the mobile station M ₀₃ in the traveling vehicle table 80 is updated.

It should be noted that a certain regional station 30 does not always detect the specific mobile station 16 through the roadside station 10 arranged at the end of the in-service area of the regional station 30. For example,
If the vehicle-mounted device 16 of the vehicle 12 is turned off for some reason and moved to another district station 30's pipe, and then the vehicle-mounted device 16 is powered on, the roadside station 10 that is not the end of the district station 30's pipe The mobile station 16 may be detected for the first time through.

Information addressed to the mobile station 16 from the centers 26, 28, the general telephone network 24, and the data exchange network 25 is temporarily stored in the memory 42 of any ground station, for example, the roadside station 10. In the roadside station 10, the static vehicle specific code 50 obtained from the mobile station 16 in the service area
And the destination code of the transmission information are compared, and the corresponding mobile station
Check if there is any information to send to 16. When a match between the two is detected, the information stored in the memory 42 is transferred to the mobile station 1 using the downlink channel of the vehicle communication unit 108.
Send to 6. The information transmitted from the mobile station 16 through the uplink channel is temporarily stored in the memory 42. This upstream transmission information will later be sent to the center via the road-vehicle individual communication line network 22.
It is transferred to 26, 28 or general telephone network 24.

When the vehicle communication unit 108 ends, the communication completion unit 110 that transmits the upper and lower response signals follows. This is a signal for confirming the completion of the transmission, not for confirming the information content.

Thus, communication of one frame 100 is performed while the subscribing vehicle 12 is traveling in the service zone 20 of the road station 10. The mobile station 16 cannot communicate with the road-to-vehicle individual communication network 22 while the joining vehicle 12 is traveling in the non-radio wave area between two adjacent zones 20. By using a single frequency, a conventional leaky coaxial cable broadcasting system may be envisioned. However, this embodiment is not a broadcasting system but an individual communication system to the last, and is fundamentally different from a leaky coaxial cable broadcasting system in that there is no radio wave area.

In this embodiment, in principle, the minimum zone in which the
It is configured such that one communication is completed while being included in 20. Regardless of whether it is a general road or an expressway, as long as the vehicle is traveling normally on the road, the joining vehicle 12 travels in some minimal zones 20 across the above-mentioned anechoic region, and thus is considerably cohesive. Road stations 10 are arranged along the road at intervals such that communication can be performed. In other words, such a spaced arrangement of the on-road station 10 can sufficiently achieve the required communication even for the mobile station 12 having a large amount of communication traffic.

By the way, in the present embodiment, in order to efficiently control the incoming call to the mobile station 16, a plurality of on-road stations 10 are configured as a broadcast group according to the area where they are arranged. When receiving a call to the mobile station 16, broadcast communication is performed in units of this group. In this group configuration, for example, one district station 30 as a unit and all the roadside stations 10 accommodated therein may be one broadcasting group. Alternatively, among the roadside stations 10 accommodated in the district station 30, some regionalized stations may be set as a unit for the broadcast group. In the latter case, as shown in FIG. 3, the local station 30 is provided with a road station table 134, which stores which road station 10 in the service area is included in which broadcast group. This table 134 is referred to when making a broadcast during an incoming connection. In this case also the passing vehicle table as described above.
It is preferable that the area managed by 170 be the same as the broadcast group configuration. That is, it is advantageous that the geographic area managed by the passing vehicle table 170 as to whether or not a certain mobile station 16 is detected for the first time is the same as the geographic area of the broadcast group managed by the on-road station table 134.

In the example shown in FIG. 8, the roadside stations D _{0 to} D ₇ which are locally grouped around the road 136 are accommodated in _one district station A ₀ B ₁ C ₁ , and these roadside stations are broadcast as one unit. Form a group. The district bureau A ₀ B ₁ C ₂ also houses another related area, such as the road bureau D ₀ .

The sequence of incoming from the center 26 or 28 to the mobile station A ₁ B ₁ M ₀₃ using the mobile station position data constantly updated by the registration station A ₁ B ₁ will be schematically described with reference to FIG. 7. . A message from the center 26 or 28 to the mobile station A ₁ B ₁ M ₀₃ passes through the central office 34 with a header in the form of a static vehicle specific code 50 including its destination code “A ₁ B ₁ M ₀₃ ”. Sent to registration authority A ₁ B ₁ . This message transfer is performed by identifying the destination code "A ₁ B ₁ M ₀₃ " of the message at each relay station. When the registration authority A ₁ B ₁ receives this message with the header,
The registration qualification of the mobile station A ₁ B ₁ M ₀₃ that should receive the call is checked, and if satisfied, the message is temporarily stored in a memory (not shown) (140). Although not shown in the figure, the registration station A ₁ B ₁ returns a reception confirmation response to the center 26 or 28 at this time.

Therefore, the registration station A ₁ B ₁ refers to the traveling vehicle table 80,
The current position of the terminating mobile station A ₁ B ₁ M ₀₃ is checked from the mobile station position data. As a result, the current position of mobile station A ₁ B ₁ M ₀₃ is
For example, if it turns out to be "A ₁ B ₁ C ₂ ", the registration authority A ₁ B
₁ creates a dynamic vehicle-specific code 60 that includes the address "A ₀ B ₁ C ₂ " of the district station 30 as the traveling area code 64. Registration station A ₁ B ₁ reads the transmission from the memory message, district station adds the dynamic code 60 to the header A ₀ B ₁ C ₂
Send to.

Relay stations, such as the central office 34 and the regional office 32, identify the dynamic vehicle specific code 6 of the message and pass it on to the desired local office.
Transferred to the A ₀ B ₁ C _2. Upon receiving this message, the regional station A ₀ B ₁ C ₂ broadcasts to all the roadside stations D _{0 and the} like accommodated in the local station.

It should be noted that when the district station, for example, the roadside station 10 accommodated in A ₀ B ₁ C ₂ forms a plurality of broadcast groups, the district station A ₀ B ₁ C ₂
Refers to the passing vehicle table 170 based on the static vehicle specific code 50 received together with the message from the registration station A ₁ B ₁ , and indicates the roadside station 1 indicated by the traveling area code 64 of the mobile station A ₁ B ₁ M _03.
Identify 0. According to this discrimination effect, the district office A ₀ B ₁ C ₂
By referring to the roadside station table 134, the broadcast group to be accessed is determined, and the broadcast is applied to all the roadside stations 16 forming the broadcast group.

The broadcast includes a delivery request, and a message and a destination code of the messages include "A ₁ B ₁ M _03". Each roadside station 10
Upon receiving this, the message is temporarily stored in the memory 42, and the mobile station 16 included in the service zone 20 is also stored.
Poll. This polling is performed by the introduction unit 102 of the frame 100 as described above.

In response to this polling, the active mobile station 16 included in the service zone 20 of the roadside station 10 generates the vehicle codes 50 and 60 in the vehicle code generation unit 130 and returns the vehicle codes 50 and 60 to the roadside station 10. The vehicle recognition unit 104 is used for this.
The roadside station 10 temporarily stores the vehicle code returned from the mobile station 16 in the passing vehicle table 82, and compares the static vehicle unique code 50 among them with the destination code "A ₁ B ₁ M ₀₃ " of the message (142). ). When the two match at any of the roadside stations 10, the station 10 reads the transmission message from the memory 42 and transmits it using the vehicle communication unit 108 on the channel of the mobile station A ₁ B ₁ M ₀₃ . Mobile station that received the message A ₁ B ₁ M ₀₃
Returns a reception confirmation response using the communication completion unit 110, and this is finally transferred to the registration station 34 via the ground station. If the acknowledgment of receipt includes an acknowledgment ACK, district station A ₀ B
₁ C ₁ cancels the delivery request to another road station 10.

Under the control of the district station A ₀ B ₁ C ₁ , the remaining road station 10 for which the vehicle code does not match in step 142 discards the message stored in the memory 42 and ends this processing. It should be noted that each station returns an acknowledgment response at each step of the mobile station incoming sequence, but this is not shown in FIG. 7 in order to avoid complication of the figure.

Alternatively, the broadcast may not be performed in the mobile station incoming sequence, and the specific roadside station 10 selected in a predetermined procedure may be configured to receive the incoming call to the mobile station 16. In that case, the district office, for example A ₀ B ₁ C _2, will pass the transit vehicle table 17 based on the static vehicle unique code 50 received with the message from the registration authority A ₁ B _1.
By referring to 0, the roadside station 10 indicated by the traveling area code 64 of the mobile station A ₁ B ₁ M ₀₃ is identified. For example, an adjacent roadside station that is related to the identified roadside station 10 in a predetermined relationship is accessed to attempt an incoming connection to the mobile station A ₁ B ₁ M ₀₃ .

In summary, in this embodiment, each mobile station 16 is registered in advance at a specific ground station. When the district station 30 first detects a specific mobile station 16 in the jurisdiction of the district station 30 via the roadside station 10 under its control, the district station 30 notifies the registration station of its current position. The registration office holds this current position data and constantly updates it in real time. The notification of the current position of the mobile station 16 that has entered the jurisdiction of the district station 30 to the registration station is limited when the district station 30 first detects the mobile station 16 through the on-road station 10 in the jurisdiction. There is not much communication traffic for this purpose, and therefore the communication traffic of the original information is not hindered by this.

When the mobile station 16 receives an incoming call, it accesses the registered station of the mobile station 16 to find its current position, and moves from the roadside station 10 related to the current position or estimated from it to the target movement. Incoming connection is made to the station 16. As a result, the problem of position uncertainty at the time of incoming to the mobile station 16 is avoided, and efficient incoming control is performed.

The embodiment in which the present invention is applied to the road-to-vehicle individual communication system has been described. However, the present invention is not limited to this, and is effectively applied to individual communication with any mobile object other than a vehicle, for example, an individual, that is, a pedestrian in a broad sense.

It should be noted that the embodiments described here are for describing the present invention, and the present invention is not necessarily limited thereto. Modifications and variations that can be made by those skilled in the art without departing from the spirit of the present invention. Modifications are included in the scope of the present invention.

(Effects of the Invention) In the mobile communication system according to the present invention, a mobile station is registered in a specific switching center, and the current position of the mobile station is managed by the registration station. The switching center accommodating the base station notifies the registration station of its current position when it first detects a specific mobile station that has entered the area via the base station in its management area. Hold. Therefore, communication traffic for reporting the current position does not increase, and proper information communication is properly secured.

[Brief description of the drawings]

FIG. 1 is an explanatory view conceptually showing a mobile station position detecting system for mobile communication according to the present invention, and FIG. 2 is an embodiment in which a mobile communication system to which the present invention is particularly applied is applied to road traffic of vehicles. Is a conceptual block diagram showing an individual road-to-vehicle individual communication system, FIG. 3 is a relay system diagram showing an example of a station floor configuration of an individual road-to-vehicle individual communication network in the embodiment shown in FIG. 2, and FIG. FIG. 5 is an explanatory view showing an example of a format of a vehicle-specific code in the embodiment, FIG. 5 is an explanatory view showing an example of a frame format in the embodiment, and FIG. 6 is an example of a sequence for detecting the position of a mobile station in the embodiment. FIG. 7 is a sequence diagram showing an example of an incoming sequence to the mobile station, and FIG. 8 is an explanatory diagram conceptually showing the first detection of the mobile station in the same embodiment. Description of main part code 10 …… Roadside station 12 …… Joined vehicle 14 …… Transceiver 20 …… Minimum zone 22 …… Road-to-vehicle individual communication network 30,32,34 …… Exchange station, ground station 42 …… Memory 80 …… Traveling vehicle table 82,170 …… Passing vehicle table 130 …… Vehicle code generator 132 …… Station code generator 134 …… Roadside station table

Claims (1)

(57) [Claims] 1. A plurality of base stations each communicating with a mobile station via a wireless link, and a plurality of regional stations each accommodating a plurality of units of base stations among the plurality of base stations. A plurality of district stations forming a communication circuit network for exchanging communication with a unit base station, and a plurality of communication circuits for accommodating the plurality of district stations and exchanging communication with the plurality of district stations. A mobile station, wherein the mobile station is located close to the base station, and the mobile station is spaced apart from the base station by interposing an area in which the mobile station does not substantially respond to radio waves of the radio link. Is a mobile station position detection system for mobile communication registered in one of the registered exchange stations of the plurality of exchange stations in association with an identification code that identifies the mobile station, among the plurality of base stations. Regionally related A plurality of units of base stations form a group and are accommodated in one of the plurality of regional stations, and the mobile station responds to polling from the base station by the wireless link, and the mobile station is registered. An identification code including a static code including a registered exchange code indicating a registered exchange and a mobile station code assigned to the mobile station, and a dynamic code including a travel area of the mobile station to the base station Further, based on the information from the base station, the dynamic code including the traveling area of the mobile station is updated, and the regional station that accommodates the base station forming the group is a base station forming the group. Upon receiving information indicating that the mobile station has been detected by any of the stations, the mobile station dynamic code notified from the mobile station to the regional station via the base station, and Based on the driving area in the area, Detecting that the station has entered the travel zone in the local office from the travel zone in another area, and notifying the exchange registered with the mobile station of the detected location of the mobile station; A mobile station position detection system for mobile communication, wherein the exchange station with which the station is registered stores the position of the mobile station reported from the district station.