JPH1042349A - Position estimation system for moving station in moving communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To estimate a position with high precision by providing the communication terminal of a moving communication system having the base zone of a small zone for the moving station of a moving communication system having the base zone of a large zone and estimating the position of the moving station by means of grasping the base zone of the small zone. SOLUTION: When a key input part 65 executes the position information request operation of the moving station 5, a control part 64 generates a position information request signal and gives an instruction on the generation of the position information request signal of the moving station 5 to a signal processing part 61 based on the signal. The signal processing part 61 generates the position information request signal, adds the code of the moving station 5 being a transmission destination and outputs it to a frequency conversion processing part 63. The frequency conversion processing part 63 converts the modulation wave of the position information request signal into the radio frequency of the first moving communication system and transmits it. The moving station 5 previously establishes a link with the base station 1 of the first moving communication system. A base station 1-side can grasp in which base zone of the base station 1 it is positioned through the communication network.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for estimating the position of a mobile station on the command station side in a mobile communication system having a large zone base zone.

[0002]

2. Description of the Related Art In a mobile communication system, it is sometimes convenient for a command station to grasp the position of a mobile station without intervention of a mobile station operator, that is, to use the mobile station itself as a position detector. . For example, in transportation services such as home delivery services, it is convenient to estimate the position of each truck at the headquarters without trouble of the driver, and automatically when emergency calls are made from security radios. It is necessary to be able to estimate its position.

Conventionally, the following method is known as a method for estimating the position of a mobile station in a mobile communication system. For example, in a digital radio system used for transportation services, each base station is connected by a communication network, and the connection of the mobile station to the base station is performed to the base station in the best reception state. Therefore, in the headquarters, which is a command station, for example, a slave station provided in a building, the connection information between the mobile station and the base station makes it possible to determine in which service area (base zone) the base station is located. The position of the mobile station can be estimated.

There is also known a method of receiving signals from three or more communication satellites and calculating the position of a receiver (mobile station) based on the signals. In this method, signals are received from three or more satellites that emit signals in the GHz band whose time is completely synchronized by an atomic clock, and the time difference between the arrivals of the signals and parameters such as satellite orbits included in the signals are received. Is a method of calculating the position of the receiver from the global positioning system (G
PS: GlobalPositioning System
em). When this method is used, the nominal accuracy of positioning of a publicly available C / A code is 100.
m.

[0005]

In a digital radio system used for a transportation service or the like, a base zone covered by a base station is a large zone having a radius of several tens of kilometers, and therefore, connection information to the base station is used. When estimating the position of the mobile station, there is a disadvantage that the position estimation accuracy is poor because the position estimation area extends over several tens of kilometers in radius.

When a communication satellite is used, it is necessary to always point the antenna upward at the mobile station side, so that it is difficult to make the portable type, and there is also a drawback that power consumption is large.

An object of the present invention is to provide a system having a high position estimation accuracy in estimating the position of a mobile station in a mobile communication system whose base zone is a large zone.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a mobile station of a first mobile communication system having a large zone base zone.
A communication terminal of a second mobile communication system having a base zone of a small zone is provided. With this communication terminal, the current position is grasped in which base zone of the small zone, and based on the result, It is intended to estimate the position of the mobile station. According to such a system, the position of the mobile station can be estimated with high accuracy even in a mobile communication system having a large zone base zone.

In this case, the base zone of the base station of the second mobile communication system needs to exist in the base zone of the first mobile communication system. As the second mobile communication system, for example, a personal handyphone
System (PHS). Specifically, the communication terminal performs communication with a base station of a second mobile communication system to detect which communication base station of the second mobile communication system is located in the base zone. The position in the mobile station is estimated based on the identification code corresponding to the detected base station. In this case, for example, the command station is provided with a map information storage unit for storing data in which the identification code of the base station of the second mobile communication system is associated with the position of the base zone of the base station. The position of the mobile station is estimated by referring to the storage unit.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of an embodiment of the present invention.
1 (1-1 to 1-n) are base stations of the first mobile communication system, and
It is connected to the. In this example, the first mobile communication system uses TDM / TDMA [Time Division M].
multiplex) / (Time Division)
Multiplex Access: Time Division Multiplexing / Time Division Multiple Access], and the service area (base zone) that can be covered by each base station 1 has a radius of about 20 to
30 km. In the base zone of the base station 1, a PHS (Person) which is a second mobile communication system is provided.
A base station 3 of an al Handyphone System (digital cordless telephone system) is provided. The PHS is a "communication system for digital cordless telephones and simplified portable telephones specified in Article 49-8-2 and Article 49-8-3 of the Radio Equipment Regulations", and is the Association of Radio Industries and Businesses. Are products and services based on the "Second Generation Cordless Telephone System Standard (RCRSTD-28)".

The first mobile communication system includes a command station 4 and a mobile station 5, and the command station 4 is installed in, for example, a building of a transport service headquarters, and the mobile station 5 is mounted on a truck in a transport service, for example. ing. A feature of the embodiment of the present invention is that the mobile station 5 has a built-in PHS communication terminal 50 as shown in FIG.
0 transmits the identification code (CS-ID) of the base station 3 of the PHS whose location is to be registered from the mobile station 5 to the command station 4 via the base station 3 and the command station 4 side based on the identification code. The point is that the position of the mobile station 5 is estimated. The CS-ID referred to here is a business operator identification code and an outdoor public additional I.
PH composed of D (Identification)
This is the identification code of the S base station.

FIG. 3 shows the configuration of the command station 4 and the mobile station 5.
This will be described with reference to FIG. The command station 4 includes a signal processing unit 6
1, audio processing unit 62, microphone 62a, speaker 62b,
Frequency conversion processing section 63, control section 64, key input section 65,
A map information storage section 66 and a display section 67 are provided. The signal processing unit 61 has a function at the time of transmission, for example, based on a function of digitizing an audio signal input from the audio processing unit 62 and performing time division processing such as insertion of a synchronization frame, or a data string subjected to time division processing. In addition to having a function of modulating the signal into a 16QAM signal, it also has a known function as a function at the time of reception, such as a function of demodulating a received signal sent from the frequency conversion processing unit 63 and extracting a data string. Further, the signal processing unit 61, which is one of the characteristic parts of the embodiment of the present invention, has a function of generating a position information request signal according to a command from the control unit 64.

The audio processor 62 A / D converts an analog audio signal input from the microphone 62a, and
1 and also has a function of D / A converting a digital audio signal sent from the signal processing unit 61 and outputting it to the speaker 62b. The frequency conversion processing unit 63 converts the modulated wave input from the signal processing unit 61 into a radio frequency assigned to the first mobile communication system, transmits the radio frequency from an antenna, and frequency-converts a received signal received from the antenna. Output to the signal processor 61.

The control unit 64 performs various controls based on an operation input from the key input unit 65 or based on a program in a memory (not shown).
As a feature of the embodiment of the present invention, when a position information request is input from the key input unit 65, a function of instructing the signal processing unit 61 to generate and modulate a position information request signal, and a function of receiving a signal When the identification code is recognized as a station identification code, the function of outputting a position corresponding to the identification code to the display unit 67 based on the identification code and the data in the map information storage unit 66 is provided. The display unit 67 is configured by, for example, a CRT screen, a liquid crystal display, or the like.

The mobile station 5 has the same configuration as a command station, which is a communication terminal of the first mobile communication system, and performs frequency conversion in order to perform communication with the first mobile communication system base station 1. Processing unit 71, first signal processing unit 72, audio processing unit 73, microphone 73a, speaker 73b, and control unit 74
have. Further, as a feature of the embodiment of the present invention, the mobile station 5 includes a second frequency conversion processing unit 75, a second signal processing unit 76, and an interface unit 77 corresponding to a PHS communication terminal.

The second frequency conversion processing unit 75 converts the transmission signal input from the second signal processing unit 76 into a radio frequency assigned to the PHS, transmits the radio signal from the antenna, and receives the reception signal received from the antenna. Is frequency-modulated to
Has a function of outputting to the signal processing unit 76.

The control section 74 performs various controls based on a program in a memory (not shown), and recognizes that the signal received from the base station 1 of the first mobile communication system is a position information request signal. Then, it has a function of outputting a position information request signal to the second signal processing unit 76.

When the position information request signal is sent from the control unit 74, the second signal processing unit 76 finds the base station 3 where the PHS communication terminal will be registered. That is, the logical control channel LCCH (Logical Conto
CS-ID is always transmitted from the base station 3 through the control channel (control channel), and the second signal processing unit 76
This control channel LCCH is received, decoded, and the identification code (CS-I
D), and has the function of writing it to a RAM (not shown) and outputting the identification code to the first signal processing unit via the interface unit 77.

Next, the operation of the above embodiment will be described. When the command station 4 is now trying to estimate the position of the mobile station 5, for example, when the operator operates the key input unit 65 to perform a position information request operation of the mobile station 5, the control unit 64 outputs a position information request signal. Generate. The method of providing the position information request signal to the control unit 74 may be a method using the key input unit 65, but may be such that a position information request operation is automatically given to the control unit 64 at a predetermined timing by a program.

The control unit 64 instructs the signal processing unit to generate and modulate a position information request signal of the mobile station 5 based on the position information request. On the other hand, the signal processing unit 61 has already received a control signal from the base station 1 of the first mobile communication system, has established a link with the base station 1, and is in a communicable state. Then, the signal processing unit 61 generates a position information request signal based on the command from the control unit 64, adds the code of the mobile station 5 as the transmission destination to this position information request signal, and adds a predetermined modulation. Output to the frequency conversion processing unit 63. The frequency conversion processing unit 63 converts the modulated wave of the position information request signal into a radio frequency of the first mobile communication system, and transmits the radio wave into the air via an antenna. The flow up to this point corresponds to steps A1 and A2 in FIG.

The mobile station 5 has already established a link with the base station 1 of the first mobile communication system, and the base station 1 grasps which base station 1 is located in the base zone through the communication network 2. it can. Although FIG. 3 shows that the command station 4 and the mobile station 5 are linked to the common base station 1 due to space limitations, for example, as shown in FIG. And the mobile station 5 is located in the base zone of the base station 1-1.

Therefore, in this example, the position information request signal is transmitted from the base station 1-1, received by the first frequency conversion processing section 71 via the antenna of the mobile station 5, and converted into a predetermined frequency. Is sent to the first signal processing unit 72 (step B1 in FIG. 4). The first signal processing section 72 demodulates and decodes the transmitted signal, and outputs the decoded signal to the control section 7.
4 is output. The control unit 74 determines that this signal is a position information request, and outputs a position information request signal to the second signal processing unit (PHS signal processing unit) 76 (step B).
2). If the received signal is not a position information request signal, normal processing, for example, the sound processing unit 73 and the speaker 73
b to output a voice.

The second signal processing unit 76 receives and decodes the control channel in the base station 3 of the second mobile communication system (PHS) as described above by receiving the position information request signal. Then, it takes in the identification code (CS-ID) assigned to the base station 3 (step B3) and outputs it to the first signal processing unit 72 via the interface unit 77. The first signal processing unit 72 adds the code of the command station 4 that is the transmission destination to the identification signal, adds a predetermined modulation to the identification signal, and performs the first mobile communication system via the first frequency conversion processing unit 71. (Step B4).

This signal is transmitted from the base station 1-n and enters the signal processing section 61 via the antenna of the command station 4 and the frequency conversion processing section 63 (step A3), where demodulation and decoding are performed. It is input to the control unit 64. Control unit 64
Recognizes that this signal is the identification code of the PHS base station 3 and refers to the map information storage unit 66 to search for position information corresponding to the identification code (CS-ID) (step A4), The position information is displayed on the display unit 67 in association with the mobile station 5 (step A5). Examples of the position information include an address and the like.

According to the above-described embodiment, although a PHS communication terminal is provided in a mobile station of this system, a PHS communication terminal is provided in a mobile station of this system, for example, in a mobile communication system having a large zone with a radius of several tens of kilometers. The position of the mobile station 5 can be estimated with a position accuracy corresponding to the size of the zone. Since the base zone of the base station in the PHS has a radius of at most several hundred meters, the position of the mobile station 5 is narrowed down to this narrow area, and the position estimation error is at most several hundred meters. Can be estimated.

Also, since the mobile station automatically transmits the PHS identification code upon receipt of the position information request signal from the command station, there is no need for intervention by a truck operator or the like. Even if the worker is away from the truck, the position can be estimated at the command station.

Note that the second signal processing unit 76 of the mobile station 5 detects the received electric field strengths of the PHSs of at least three locations near the mobile station 5 from the base station 3 and based on the received electric field strengths, 5 and the distance between each base station 3 are calculated,
The position of the mobile station 5 may be estimated based on each of the calculated distances.
0 m or less.

In the above, the map information storage section is provided in the mobile station side, and the mobile station side obtains position information based on the identification code of the PHS base station and the map information storage section, and instructs the position information. It may be sent to a station. The command station is not limited to being provided at the headquarters in the building, and may be, for example, one of the mobile stations. In this way, for example, the worker of one truck can estimate the position of another truck. For example, if the configuration of the command station described above is incorporated in each mobile station, other mobile stations can perform other mobile operations. The location of the station can be estimated.

Further, the first mobile communication system has a taxi system.
For example, the present invention may be applied to a transport service system for people, a management system for emergency vehicles, or a mobile phone system, and the second mobile communication system is limited to the PHS. Not something. In the above example, PH
The communication terminal of S has only the receiving function. However, for example, when using another communication system that requires location registration processing, the communication terminal may have the transmitting function. The large zone base zone referred to in this specification is not limited to the area of about several tens of kilometers, but merely means the former of a wide base zone system and a narrow base zone system. belongs to.

[0030]

According to the present invention, the mobile station of the mobile communication system having the base zone of the large zone is provided with the communication terminal of the mobile communication system having the base zone of the small zone, and this communication terminal is located. Since the position of the mobile station is estimated by grasping the base zone of the small zone, the position can be estimated with high accuracy.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of an entire system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a part of the system according to the embodiment of the present invention;

FIG. 3 is a configuration diagram showing a configuration of a command station and a mobile station according to the embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the embodiment of the present invention.

[Explanation of symbols]

1 (1-1), (1-2),... (1-n) Base station of first mobile communication system 2 Communication network 3 Base station of second mobile communication system (PHS) 4 Command station 5 Mobile station 61 signal processing unit 64 control unit 66 map information storage unit 72 first signal processing unit 74 control unit 76 second signal processing unit

Claims (5)

[Claims] 1. A system for estimating a position of a mobile station of a first mobile communication system having a base station by a command station, wherein the base zone is located in a base zone of the base station and is smaller than the base zone. Using a second mobile communication system having a base station forming the second mobile communication system, a mobile terminal of the first mobile communication system is provided with a communication terminal of the second mobile communication system; Performing communication with a base station to detect in which base station of the second mobile communication system the communication terminal is located in a base zone, and estimating the position of the mobile station based on the detection result; A mobile station position estimation system in a mobile communication system, characterized in that: 2. The method according to claim 1, wherein the detection result by the communication terminal of the second mobile communication system is an identification code uniquely assigned to each base station and capable of identifying the base station. A mobile station position estimation system in a mobile communication system. 3. The command station includes a map information storage unit that stores data in which an identification code of a base station of the second mobile communication system is associated with a position of a base zone of the base station. The mobile station based on an identification code corresponding to the base station of the second mobile communication system received from the mobile station via the base station of the first mobile communication system and data in the map information storage unit. 3. The system according to claim 2, wherein the position of the mobile station is estimated. 4. The command station sends a position information request signal to the mobile station via a base station of the first mobile communication system, and the mobile station sends a second request to the communication terminal based on the reception of the position information request signal. The identification code corresponding to the base station of the mobile communication system is acquired, and the acquired identification code is sent to the command station via the base station of the first mobile communication system. 4. A system for estimating a position of a mobile station in the mobile communication system according to 3. 5. The mobile station location estimation system according to claim 1, wherein the second mobile communication system is a personal handyphone system.