JPH06103949B2 - Incoming call control method for mobile communication system - Google Patents

Description

Description: TECHNICAL FIELD The present invention controls an incoming call to a mobile in a mobile communication system, and more specifically in a mobile communication system suitable for communication with a vehicle such as an automobile. Regarding control method.

(Prior Art) As a conventional mobile communication system to which the present invention is particularly relevant, there is, for example, a car telephone system. As is well known, in a conventional mobile telephone system, base stations covering a predetermined service zone are two-dimensionally arranged, and the zones of adjacent base stations are partially overlapped with each other so that communication with a mobile body can be performed. Some use a cellular system that guarantees continuity.

When making a call to the mobile station, it is necessary to identify the current position of the mobile body. In the 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 structure and repeatedly use the same frequency. 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, it has been necessary in the conventional cellular system to widen each zone or increase the allocated 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 the case of 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 many vehicles, 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.

Also, each time a call arrives, each base station makes a call all at once, and the mobile station responds to the call before making an incoming call connection. Therefore, the incoming call connection control 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, if a plurality of base stations wirelessly linked to a mobile station are separated from each other with a non-radio wave area between adjacent base stations interposed therebetween, these base stations can be used as a single radio wave for a wireless link. Frequency could be used. 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 view of such a demand for mobile communication, the present invention can efficiently perform incoming call control to a mobile station in a new mobile communication system capable of high-speed communication without occupying many frequencies. It is an object to provide an incoming call control system for a mobile communication system.

(Means and Actions for Solving the Problem) According to the present invention, a plurality of base stations each communicating with a mobile station via a wireless link, and a communication line accommodating the plurality of base stations and exchanging communication therewith In an incoming call control method of a mobile communication system including a plurality of exchanges forming a network, a plurality of base stations that are close to each other are located in an area where the mobile station does not substantially respond to a radio wave of a wireless link. Interleaved with each other, the mobile station is registered in one of the plurality of exchanges, and the locally related stations of the plurality of base stations form a group to form one of the plurality of exchanges. When one of the plurality of base stations accommodated detects a mobile station, the exchange that accommodates the base station that has detected the mobile station determines the first position information indicating the position of the mobile station and the mobile station. Whether is at the edge of the area 2nd position information indicating that the mobile station is transferred to the registered switching center of the mobile station, and the registered switching center of the detected mobile station stores the first and second position information. When making an incoming call to the mobile station, the registered exchange of the mobile station refers to the first and second position information stored in the mobile station, and the second position information indicates that the mobile station is the source of the area. If it is not at the end, the switching station indicated by the first position information makes an incoming connection to the mobile station, and the second position information indicates that the mobile station is at the output end of the area. Then, an incoming call connection is made to the mobile station from the exchange station in the area close to the exchange station indicated by the first position information.

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.

A mobile station position detection system for mobile communication according to the present invention,
In the intermittent minimum zone method, when recognizing the current position of the mobile station, pay special attention to the base station at the outgoing end of each exchange, and when the mobile station passes through the base station at the outgoing end, Access to the mobile station from a base station that may shift to. This reduces the probability of an invalid incoming connection to the mobile station and allows the mobile station of interest to be efficiently terminated as long as it is active.

(Embodiment) Next, an embodiment of an incoming call control system for a mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows an embodiment in which a 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. Roadside station 10 is a participating vehicle on the road
It is a ground station that functions as a base station that wirelessly communicates with 12.

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, that is, zone 20.
It communicates with the vehicle 12 existing inside. 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. The diameter may be, for example, on the order of tens of meters to 100 meters. Therefore, between two adjacent zones 20, there is a region 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 region", 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 from this, in this method, the adjacent roadside station 10
Also, the same frequency can be effectively used repeatedly. 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. Due to these characteristics, this method is called the "intermittent minimum zone method", and the zone 20 is called the "minimum zone".

The roadside station 10 constitutes a part of a road-to-vehicle individual communication line network 22, and in the present embodiment, via the line network 22, a general telephone line network 24, a data exchange network 25 such as a general packet exchange network, and a system center 26. And user center 28 and others, and access to equipment. In the present embodiment, the road-to-vehicle individual communication line network 22 has a station-level structure as illustrated in FIG. 3, and is provided between the general telephone line network 24, the data exchange network 25 and the centers 26, 28 and the mobile station 16. It is a communication network that performs switching, that is, switching. This will be described in detail later.

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

Referring to FIG. 3, the road-to-vehicle individual communication line network 22 in this embodiment includes a plurality of roadside stations 10 arranged in a certain area.
Has a hierarchical structure including a regional station 30 in which a plurality of regional stations 30 are accommodated, a regional station 32 in which a plurality of regional stations 30 are accommodated over an area, and a general bureau 34 in which some of these regional stations 32 are accommodated. These exchanges 30, 32, 34 including the roadside station 10 are referred to as ground stations. In the present 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, and the network between the general bureaus 34 is a network. Form a type network. 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 for independently managing the operation of the belonging vehicles 12 belonging to a specific user. Both are accommodated in the general bureau 34 by the trunk line 40. Of course, these may be connected to the regional office 32 or the district office 30.

The general bureau 34, the regional bureau 32 and the district bureau 30 each have a unique station code. Of these, General Administration Bureau 34 and Regional Bureau
By expressing the 32 codes in the station hierarchy, regional stations
A registered ground station code 52 (Fig. 4) identifying 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 that specifies this system in distinction from other systems, and may be omitted inside this 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 subscribing vehicle 12 uses the vehicle code generation unit 130 (the third
), 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 local station 32 is "A ₁ B ₁ "
If 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 ”.

The dynamic code 60 is a code corresponding to the moving state of the joining vehicle 12, and is effectively used for grasping and navigating the current situation of the joining vehicle 12. Therefore, the code is a vehicle-specific code related to the traveled area and the traveling status of the subscribing vehicle 12, and is the general telephone line network 24, the data exchange network 25, and the centers 26, 28.
Plays an important role in searching for the vehicle position and providing route guidance information to the travel destination of the joining vehicle 12 for individual communication from the. Therefore, in the present embodiment, a destination code 62 indicating the operation destination of the subscribing vehicle 12 and a traveling area code 64 indicating the current traveling area are included. Driving area code 64 is
It is composed of the station code of the general station 34, the regional station 32, and the regional station 30, and the boundary indication bit 64a. In addition to this, a link code for specifying the set communication link may be included. The station code may include a roadside station code. Boundary display bit
64a will be described in detail later, but the roadside station 1 that has detected the mobile station 16
This is a bit indicating whether 0 is a roadside station at the end of the service area of the district station 30.

In this embodiment, as shown in FIG.
Are available at Regional Bureau 32. The traveling vehicle table 80 stores, for each station area, data indicating the current traveling area of the joining vehicle 12 of the own station registered as belonging to the regional station 32. Data of the subscribing vehicle 12 traveling in the area is stored for each registration station. 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, when the mobile station 16 goes out of the jurisdiction of the regional station 30, the mobile station 16 reserves the area where the mobile station 16 will be present next, and the district station 30 having jurisdiction over the area makes an incoming connection. . For example, in the example shown in FIG. Mobile station A ₁ B ₁ M ₀₃ traveling on road 136 will soon rush into the jurisdiction of nearby district station A ₀ B ₁ C ₂ when it passes the end road station A ₀ B ₁ C ₁ D ₇ . .
On the road 136 as shown in FIG. 11, the mobile station A ₁ B ₁ M ₀₃
Will pass the on-road station 10 at the end of district station A ₀ B ₁ C ₁ and will soon move into the jurisdiction of either district station A ₀ B ₁ C ₂ or A ₁ B ₀ C ₀ .

The possibility of moving between the district stations 30 is stored as a district station table 138 in the memory of the registration station in which the mobile station 16 is registered, such as the regional station 32, for example, A ₁ B ₁ in this embodiment. There is. That is, for example, in the district office table 138 of the registration office A ₁ B ₁ , the mobile stations 16 that leave the jurisdiction of each district office 30 included in the network 22.
The next 30 nearby stations that may move to are listed. When a call arrives at the mobile station 16, as will be described later in detail, an incoming call connection is made from the adjacent district station 30 which may move by referring to the district station table 138.

As conceptually shown in FIG. 2, the roadside station 10 is provided with a memory 42, which stores a passing vehicle table 82 (FIG. 3) and information to be transmitted to and received from the mobile station 16. Storage area. The passing vehicle table 82 is the minimum zone of the roadside station 10.
It holds the data on the joining vehicle 12 passing 20. These data include vehicle-specific codes 50 and 60, and are constantly updated as the joining vehicle 12 passes.

The mobile station 16 is mounted on a subscribing vehicle 12 such as an automobile in this embodiment, 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 transmits those signals to the passengers. It is an in-vehicle device that can be visually and / or audibly displayed on the. Preferably, it is provided with a video display, a facsimile transmitting / receiving device, a voice synthesizing device, and the like, which interface with the tower board by image and voice. Further, it may have an automatic operation control function for the control mechanism of the joining vehicle 12. The mobile station 16 has a random number table function, and in response to polling from the roadside station 10, an available free channel among a plurality of channels in the link 18 with the roadside station 10 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, the frame 100 has a cycle of 683 milliseconds (ms) and a transmission rate of 512 Kbits / second, and a plurality of channels are multiplexed in a large number of time slots included therein. In principle, required bidirectional communication is completed within this one frame period. Wireless link
A single frequency is used for 18. For full-duplex communication,
A pair of frequencies that are different from each other above and below is 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.

An introduction unit 102 is located at the head of the frame 100, and 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 unit 102 is followed by the vehicle recognition unit 104, which is a mobile station.
16 is a period in which the vehicle-specific codes 50 and 60 are transmitted in response to polling, and the roadside station 10 recognizes this. Advantageously, the two-block repetitive transmission greatly improves the recognition rate of the joining vehicle 12. 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 FIG. ₁ , eight regional road stations 10 are accommodated in one regional station C ₁ accommodated in the regional station A ₀ B ₁ , and station codes D _{0 to} D ₇ are assigned to them. 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 static vehicle code
Mobile station 16 having "A ₁ B ₁ M ₀₃ " as 50 is a roadside station A ₀ B ₁ C ₁ D
_When being polled while passing through zone ₅ of ₅ , mobile station 16 returns the identification code "A ₁ B ₁ M ₀₃ " as ground station code 52 and mobile station code 54.

Returning to FIG. 5, in the present embodiment, a broadcast communication unit 106 is arranged subsequent to the vehicle recognition unit 104, and by 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, the same frequency is used even when the joining 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 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. Further, communication with the general telephone line network 24, the data exchange network 25, or another mobile station 16 in the present system is similarly performed.

In the roadside station 10, the zone 20
The data of the joining vehicle 12 obtained from the mobile station 16 may be held in the passing vehicle table 82. The roadside station 10 transfers these data to the district station 30, regional station 32 or general station 34 through the line 36. These stations store the data thus transferred in, for example, the traveling vehicle table 80. Thus, for example, the traveling vehicle table 80 of the regional station 32 is constantly updated with new data.

More specifically, as shown in FIG.
Includes a station code generation unit 132 that generates a ground station code 52 that identifies the regional station 30.

For example district station A ₀ B ₁ C ₁ of the first figure, the station code generating unit 132
“A ₀ B ₁ C ₁ ” is set as the ground station code 52 at.
The vehicle code of the mobile station 16 “A ₁ received at the road station A ₀ B ₁ C ₁ D ₅
“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 ₁ . As shown in Fig. 6, the district station A ₀ B ₁ C ₁ uses this 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 the vehicle code“ A ₁ B ₁ M ₀₃ ”is _assigned to the regional station A ₁ B.
Transfer to ₁ . At that time, the regional station A ₀ B ₁ C ₁ transmits its own location information as information indicating the current location of the mobile station 16. This location information includes its ground station code "A ₀ B ₁ C ₁ " in the form of a driving area code 64 of the dynamic vehicle code 60 and a boundary indication bit 64a.

The boundary bit 64a is a bit indicating whether or not the roadside station 10 that has detected the mobile station 16 is a station at the end of the service area of the district station 30. For example, as shown in FIG. 8, on-road stations D _{0 to} D ₇ belonging to district stations A ₀ B ₁ C ₁ on _one road 136 such as an expressway.
Are arranged in a linear fashion, and when a roadside station D ₇ adjacent to an adjacent regional station A ₀ B ₁ C ₂ on the outskirts of the area's jurisdiction detects mobile station 16, that regional station A ₀ B ₁ C ₁ Displays a significant bit, for example "1", in the boundary display bit 64a. For this purpose
The district station 30 is provided with a roadside station table 134 (Fig. 3), and which of the roadside stations 10 in the jurisdiction is in contact with the adjacent district station 30, that is, the "end station" in the control area of the own station. Remember if there is. In this example, the roadside station A ₀ B ₁ C ₁ D ₇ is stored in the roadside station table 134 of the district station A ₀ B ₁ C ₁ as the “station at the exit end” in the traveling direction of the vehicle 12. In this example, the number of stations at the exit end is one, but in the case of a general road, the number of stations is two-dimensional, so it is generally not limited to one.

Therefore, the district station A ₀ B ₁ C _1, as shown in FIG. 9, for example when the road station A ₀ B ₁ C ₁ D ₅ detects the mobile station _{A 1 B 1 M 03 (150} ),
The roadside station table 134 is indexed to find out that the roadside station A ₀ B ₁ C ₁ D ₅ is not the outgoing end station (151). Therefore, the boundary display bit 64a remains "0" (152) and the traveling area code 64 and the dynamic vehicle specific code 50 are transmitted to the regional station A ₀ B ₁ (154).
Further, for example, when the roadside station A ₀ B ₁ C ₁ D ₇ detects the mobile station A ₁ B ₁ M ₀₃ , the roadside station A ₀ B ₁ C ₁ D ₇ is the outgoing end station from the roadside station table 134. Know that there is a border indicator bit 64
a is set to "1" (153) and mobile station data 50 and 60 are transmitted (154).

Exchanges above the regional office A ₀ B ₁ C ₁ , for example regional office A
₀ B ₁ and the general bureaus A ₀ and A ₁ identify their destination by the vehicle code “A ₁ B ₁ M ₀₃ ” of the mobile station position data to be transferred, and their registration station, that is, the regional station A in this example. Relay this to ₁ B ₁ . Registration station A ₁ B ₁ has mobile station location data, namely static vehicle code 50 and dynamic vehicle code 60.
When the mobile station code 54 is received, the target mobile station 16, that is, the station M ₀₃ in this example, is identified from the mobile station code 54, and these position data are stored in the corresponding storage position of the traveling vehicle table 80. Of course, these position data also include the boundary indication bit 64a.

The current position data of the mobile station 16 is constantly updated. Focusing on a specific mobile station, such as M ₀₃ , its position data is
For example, each time one of the roadside stations 10 detects the mobile station M ₀₃ , the district station 30 reports to the registration station A ₁ B ₁ as described above, and the memory about the mobile station M ₀₃ in the traveling vehicle table 80 is stored. Contents are updated. Alternatively, when any of the district stations 30 detects the mobile station M ₀₃ for the first time via the on-road station 10 in the jurisdiction, it may be configured to report this to the registration station A ₁ B ₁ .

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.
26, 28, data exchange network 25 or general telephone network 24.

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

In this way, communication of one frame 100 is performed by the subscribing vehicle 12 on the roadside station 1
It is performed while driving in the service zone 20 of 0. The mobile station 16 cannot communicate with the individual road-vehicle communication network 22 while the subscribing vehicle 12 is traveling in the radio-free area between two adjacent zones 20. The use of a single frequency may envision a conventional leaky coaxial cable broadcasting system. However, the present embodiment is fundamentally different from the leaky coaxial cable broadcasting system in that it is not a broadcasting system but an individual communication system, and that there is no radio wave area.

In the present embodiment, as a general rule, the minimum zone 20 where the subscribing vehicle 12 is
One communication is completed while being included in. As long as the vehicle is traveling normally on an ordinary road or an expressway, the joining vehicle 12 travels in several minimum zones 20 across the above-mentioned non-radio wave area, which causes a considerable gathering. Road stations 10 are arranged along the road at intervals such that they can perform communication. 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, using the mobile station position data that is constantly updated at the registration station A ₁ B _1, the mobile station A ₁ B ₁ M ₀₃ from the center 26 or 28 is used.
The sequence for arriving at will be briefly described with reference to FIG. A message addressed to mobile station A ₁ B ₁ M ₀₃ from Setan 26 or 28 is routed to general station 34 with a header in the form of a static vehicle-specific code 50 containing its destination code "A ₁ B ₁ M ₀₃ ". Sent to registration authority A ₁ B ₁ . This message transfer is
This is done by identifying the destination code "A ₁ B ₁ M ₀₃ " of the message at each relay station. When the registration station A ₁ B ₁ receives this message together with the header, it checks the registration qualification of the mobile station A ₁ B ₁ M _{03 which} should receive from the destination code, and if it is satisfied, stores the message in the memory ( It is temporarily accumulated (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 (16
0, Fig. 10), the receiving mobile station A ₁ B ₁ from the mobile station position data
Check the current position of M ₀₃ . As a result, if the significant bit “1” is not displayed in the boundary display bit 64a of the mobile station A ₁ B ₁ M ₀₃ (161), its current position, for example, “A ₀ B ₁ C ₁ ”, indicates the registration station A ₁ B ₁ creates a dynamic vehicle-specific code 60 that includes the address “A ₀ B ₁ C ₁ ” of the district office 30 as the driving area code 64 (162). Registration station A ₁ B ₁ reads the transmitted message from memory and adds dynamic code 60 to its header
Send to A ₀ B ₁ C ₁ (163).

Relay stations, such as general office 34 and regional office 32, identify the dynamic vehicle-specific code 60 in the message and target it to the regional office A _0.
Transfer to B ₁ C ₁ . When the district station A ₀ B ₁ C ₁ receives this message together with the header, it broadcasts to all the roadside stations 10 accommodated in it. This broadcast includes the delivery request, the message, and the destination code “A ₁ B ₁ M ₀₃ ” of the message. Upon receiving this, each roadside station 10 temporarily stores the message in the memory 42, and at the same time, the service zone 20
Poll the mobile station 16 contained within. 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 the vehicle codes 50 and 60 are generated.
Return to 0. 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). ). If they match at any of the roadside stations 10,
The station 10 reads the transmission message from the memory 42 and uses the vehicle communication unit 108 to transmit it on the channel of the mobile station A ₁ B ₁ M ₀₃ . The mobile station A ₁ B ₁ M _{03 that} has received the message 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. When the reception confirmation response includes the positive acknowledgment ACK, the district station A ₀ B ₁ C ₁ cancels the delivery request to the other on-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. Although each station returns an acknowledgment at each stage of the mobile station incoming sequence, this is not shown in FIG. 7 in order to avoid complication of the figure.

Returning to FIG. 10, when the registration station A ₁ B ₁ indexes the traveling vehicle table 80 for the mobile station A ₁ B ₁ M ₀₃ , if the boundary display bit 64a is “1” in step 161, the present embodiment is performed. In the example, the district station table 138 for the district station code “A ₀ B ₁ C ₁ ” indicated by the current position information is referred to, and the district station that administers the geographical area in which the mobile station 16 will exist next is derived. (164).
For example, in the example shown in FIG. 8, when the mobile station A ₁ B ₁ M ₀₃ running on the road 136 passes the end road station A ₀ B ₁ C ₁ D ₇ , the local station A ₀ B ₁ C ₂ will soon pass. Will rush into the pipe. Registration Authority A ₁ B ₁
Then, in this case, the district office A ₀ B ₁ C ₂ is searched from the table 138. Further, in the example shown in FIG. 11, when the mobile station A ₁ B ₁ M ₀₃ traveling on the road 136 passes the regional station A ₀ B ₁ C ₁ , the regional station A ₀ B ₁ C
It will be contained in tubes of either ₂ or A ₁ B ₀ C ₀ .
Therefore, in this case, the registration station A ₁ B ₁ searches the district stations A ₀ B ₁ C ₂ and A ₁ B ₀ C ₀ from the table 138.

The registration station A ₁ B ₁ uses the district station code thus retrieved as an address (165) and transmits a communication message, that is, makes an incoming call connection (163) in the same manner as described above. When a plurality of district office addresses are derived in this way, they are simultaneously broadcast to those district offices. Alternatively, the incoming call connection may be performed according to a predetermined priority order. In the latter case, the priority order may be set for each district station 30 in the district station table 138 or may be randomly selected.

By predicting the local area in this way, if it is attempted to make an incoming connection to the mobile station A ₁ B ₁ M ₀₃ via the local station A ₀ B ₁ C ₁ indicated by the current position information, this will be captured. The frequency of retries is reduced by avoiding a situation in which the probability of being able to work is reduced. In this embodiment, as described above, the probability of invalid incoming connection to the mobile station 16 is reduced by paying special attention to the station at the outgoing end of the area station 30.

It should be noted that in the present embodiment, the search registration station of the nearby district station 30 was used, but this need not be the case. Of course, the registration does not necessarily have to be performed by the registration authority. For example, General Administration Bureau 34
Alternatively, a similar regional station table may be prepared in the regional station 34, and those stations that have received the incoming message to the mobile station 16 may search for nearby regional stations. Further, the unit of search in the nearby land area does not necessarily have to be at the regional station level, and may be at the regional station level, for example.

An embodiment in which the present invention is applied to an individual road-vehicle communication system has been described. However, the present invention is not limited to this, and is effectively applied to individual communication with any moving body other than a vehicle, such as an individual, that is, a pedestrian in a broad sense.

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

(Effects of the Invention) A mobile station position detection system for mobile communication according to the present invention comprises:
In such an intermittent minimum zone method, when recognizing the current position of the mobile station, the mobile station passes through the base station at the outgoing end of the exchange station with special consideration of the outgoing end base station. At that time, the mobile station is accessed from the base station that may move next. This reduces the probability of invalid incoming connections to the mobile station. Therefore, as long as the target mobile station is active, proper communication with it is achieved. This system also provides various services including high-speed communication without occupying many frequencies.

[Brief description of drawings]

FIG. 1 is an explanatory view conceptually showing a mobile communication system according to the present invention, and FIG. 2 is a concept showing an embodiment in which the mobile communication system according to the present invention is applied to road traffic of a vehicle as an individual road-vehicle communication system. FIG. 3 is a relay system diagram showing an example of the station level configuration of the road-to-vehicle individual communication line network in the embodiment shown in FIG. 2, and FIG. 4 is a vehicle-specific code format in the embodiment. FIG. 5 is an explanatory diagram showing an example of a 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. , A sequence diagram showing an example of an incoming sequence to a mobile station, FIG. 8 is an explanatory view conceptually showing detection of a roadside station at the outgoing end in the embodiment, and FIG. 9 is a district station in the embodiment. Location of mobile station to registration station FIG. 10 is a flow chart showing an example of the flow of notification, FIG. 10 is a flow chart showing an example of a flow of creating a message address when the registration station of the embodiment makes an incoming connection to the mobile station, and FIG. 11 is the same embodiment. FIG. 4 is an explanatory diagram for explaining a call from a nearby district station. Explanation of main part code 10 …… Road 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 64 …… Drive area code 64a …… Boundary display bit 80 …… Traveling vehicle table 82 …… Passing vehicle table 130 …… Vehicle code generating section 132 …… Station code generating section 138 …… District station table

Claims (2)

[Claims] 1. A plurality of base stations each communicating with a mobile station via a wireless link, and a plurality of exchanges forming a communication circuit network accommodating the plurality of base stations and exchanging communication with the plurality of base stations. A mobile communication system in which adjacent ones of the plurality of base stations are spaced apart from each other by interposing a region in which the mobile station does not substantially respond to the radio wave of the radio link. In the incoming call control method according to claim 1, the mobile station is registered in any of the plurality of exchange stations, and locally related stations of the plurality of base stations form a group to form one of the plurality of exchange stations. When any one of the plurality of base stations detects the mobile station,
The exchange that accommodates the base station that has detected the mobile station is
Transfer the first position information indicating the position of the mobile station and the second position information indicating whether the mobile station is at the egress edge of the area to the switching center registered with the mobile station. , The registered exchange of the detected mobile station stores the first and second position information, and when the mobile station receives the call, the registered exchange of the mobile station If the second position information indicates that the mobile station is not at the outbound end of the area, the base station indicated by the first position information is referred to. When the incoming connection is made from a base station forming a group related to the mobile station and the second position information indicates that the mobile station is at the outgoing end of the area, the base indicated by the first position information. It arrives from the base stations that are adjacent to the group related to the station and that form the group existing in the moving direction of the mobile station. Reception control method for a mobile communication system and performing the connection. 2. The incoming call control system for a mobile communication system according to claim 1, wherein the plurality of base stations include storage means for storing information, and the base stations forming the group When the mobile station receives a call, the above-mentioned 1 that accommodates the base stations forming the group
The two exchanges broadcast the information to the mobile stations to the base stations forming the group, and the base station receiving the information stores the information in the storage means and the mobile station. To a mobile station that receives the information from among the mobile stations that respond to the polling, and the base station that makes the incoming connection of the information to the detected mobile station. Incoming call control method.