JP2022078639A - Mobile communication system, mobile station and base station - Google Patents

Abstract

To provide, by the present disclosure, a mobile communication system where a plurality of mobile stations can simultaneously communicate with a base station in a service area constructed by using a multi station simultaneous transmission method, and the mobile station and the base station thereof.SOLUTION: A mobile communication system according to the present disclosure includes a plurality of base stations, a plurality of mobile stations capable of communicating with each of the base stations with a multi station simultaneous transmission method, and a center device communicatively connected with each of the base stations. An under communication mobile station being a mobile station under communication with a base station transmits position information of the under communication mobile station to the center device via the base station. The center device calculates an interference area having possibility to interfere the communication of the under communication mobile station on the basis of the position information of the under communication mobile station, and transmits information of the calculated interference area to each of the mobile stations via each of the base stations.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to mobile communication systems, mobile stations, and base stations that perform wireless communication by a multi-station simultaneous transmission method.

In a mobile communication system, a service area is composed of a radio zone composed of a plurality of base stations. Here, the wireless zone means a range in which the base station can communicate. Communication methods for mobile communication systems include a method in which a base station operating independently in each radio zone communicates wirelessly with a mobile station, and a method in which multiple base stations transmit the same signal at the same frequency to the mobile station at the same time. There is a transmission method. The multi-station simultaneous transmission method may be adopted when the amount of simultaneous communication in which the base station communicates with multiple mobile stations at the same time in the service area is small, or when broadcast communication is often performed in the service area. .. The multi-station simultaneous transmission method secures a high frequency utilization rate and a high throughput with a small transmission power, and can secure a substantially uniform transmission quality over the entire service area.

Conventionally, in a mobile communication system adopting a multi-station simultaneous transmission method, a technique has been disclosed that enables transmission diversity to ensure high-quality communication even at the boundary of a wireless zone (for example, Patent Document 1). reference).

JP-A-2002-300977

Conventionally, a mobile communication system that employs a multi-station simultaneous transmission method is characterized in that the same signal is transmitted from a plurality of base stations to the mobile station at the same frequency. There was a restriction that only one mobile station could be used. This restriction was originally allowed because the multi-station simultaneous transmission method was originally adopted because the amount of simultaneous communication in the service area was small or broadcast communication was often performed in the service area. rice field.

However, in recent years, there has been an increasing tendency for mobile stations to transmit failure information, location information, monitoring information, etc. from mobile stations to base stations, and there is an increasing demand for multiple mobile stations to be able to communicate at the same time as base stations. did. If a plurality of mobile stations transmit data to the base station at arbitrary timings, the base station may receive data transmitted from the plurality of mobile stations at the same time. Since all mobile stations use the same frequency, if a plurality of mobile stations communicate with the base station at the same time, they interfere with each other and interfere with communication, resulting in deterioration of communication quality.

On the other hand, when the service area is wide, in reality, if there are multiple mobile stations existing in different radio zones and the distance between the mobile stations is large, the influence of interference on the base station is minor. Therefore, there may be no problem even if a plurality of mobile stations communicate with the base station at the same time. However, the mobile station cannot determine whether or not it interferes with the communication performed by other mobile stations when it communicates with the base station. Therefore, in the past, when another mobile station was communicating with the base station, it had to suspend its own communication, and there was a problem that a plurality of mobile stations could not communicate with the base station at the same time. there were.

This disclosure is made to solve such a problem, and a plurality of mobile stations may simultaneously communicate with a base station in a service area constructed by adopting a multi-station simultaneous transmission method. It is intended to provide possible mobile communication systems, mobile stations, and base stations.

In order to solve the above problems, the mobile communication system according to the present disclosure enables communication with a plurality of base stations, a plurality of mobile stations capable of wireless communication with each base station by a multi-station simultaneous transmission method, and each base station. A mobile communication system including a connected central device, which is a mobile station communicating with a base station, transmits the position information of the mobile station in communication to the central device via the base station. The central device calculates the interference area that may interfere with the communication of the mobile station during communication based on the position information of the mobile station during communication, and the calculated interference area information is transmitted to each mobile station via each base station. Send to.

According to the present disclosure, a plurality of mobile stations can simultaneously communicate with a base station in a service area constructed by adopting a multi-station simultaneous transmission method.

It is a figure which shows an example of the structure of the mobile communication system by Embodiment 1. FIG. It is a block diagram which shows an example of the structure of the mobile station by Embodiment 1. FIG. It is a block diagram which shows an example of the structure of the central apparatus by Embodiment 1. FIG. It is a figure which shows an example of the structure of the mobile communication system by Embodiment 2. FIG. It is a block diagram which shows an example of the structure of the mobile station by Embodiment 2. FIG. It is a block diagram which shows an example of the structure of the base station by Embodiment 2. FIG. It is a figure which shows an example of the structure of the mobile communication system by Embodiment 3. FIG. It is a figure which shows an example of the hardware composition of the mobile communication system by Embodiments 1 to 3. It is a figure which shows an example of the hardware composition of the mobile communication system by Embodiments 1 to 3.

<Embodiment 1>
<Structure>
FIG. 1 is a diagram showing an example of a configuration of a mobile communication system according to the first embodiment. The mobile communication system according to the first embodiment employs a multi-station simultaneous transmission method.

As shown in FIG. 1, the mobile communication system includes base stations 1 to 5, mobile stations 7 and 9, a central device 10, and a device 11.

Base station 1 has a radio zone 13, base station 2 has a radio zone 14, base station 3 has a radio zone 15, base station 4 has a radio zone 16, and base station 5 has a radio zone. Has 17. The service area 12 is composed of radio zones 13 to 17.

The mobile station 7 is mounted on the train 6, and the mobile station 9 is mounted on the train 8. The mobile stations 7 and 9 exist in the service area 12 and can wirelessly communicate with the base stations 1 to 5. Here, the communication performed from the base stations 1 to 5 to the mobile stations 7 and 9 is called downlink communication, and the communication performed from the mobile stations 7 and 9 to the base stations 1 to 5 is uplink communication. That is.

The central device 10 is communicably connected to the base stations 1 to 5 via a wired network. The device 11 is communicably connected to the central device 10, and makes a call or data communication with the mobile stations 7 and 9 existing in the service area 12 via the base stations 1 to 5 and the central device 10. It is possible to do. Although one device 11 is shown in FIG. 1, there may be a plurality of devices 11.

FIG. 2 is a block diagram showing an example of the configuration of the mobile station 7. As shown in FIG. 2, the mobile station 7 includes a transmission unit 20, a reception unit 21, a position detection unit 22, and a control unit 23. Although FIG. 2 shows the configuration of the mobile station 7 as a representative, the mobile station 9 also has the same configuration.

The transmission unit 20 transmits uplink communication data to base stations 1 to 5. Here, the uplink communication data refers to data transmitted from the mobile station to the base station by uplink communication. The receiving unit 21 receives the downlink communication data sent from the base stations 1 to 5. Here, the downlink communication data refers to data transmitted from the base station to the mobile station by downlink communication.

The position detection unit 22 detects the position of the mobile station 7. The position detection unit 22 may detect the position of the mobile station 7 from some sign or the like by the mobile station 7 itself, and obtains information on the position of the mobile station 7 from another device that measures the position of the mobile station 7. You may get it. The control unit 23 controls the transmission unit 20, the reception unit 21, and the position detection unit 22.

FIG. 3 is a block diagram showing an example of the configuration of the central device 10. The central device 10 is a device that interconnects the base stations 1 to 5 and the device 11, and includes a control unit 24 as shown in FIG.

<Operation>
Next, the operation of the mobile communication system according to the first embodiment will be described with reference to FIG. It is assumed that the mobile station 7 exists in the radio zone 13 of the base station 1. Further, it is assumed that the mobile station 7 has already started communication with the base station 1 and is making a call or data communication with the device 11 via the central device 10.

The transmission unit 20 of the mobile station 7 includes its own position information detected by the position detection unit 22 in the uplink communication data and transmits it to the base station 1. The base station 1 transmits the uplink communication data received from the mobile station 7 to the central device 10.

In the control unit 24 of the central device 10, mobile stations other than the mobile station 7 are base stations 1 to 5 based on the position information of the mobile station 7 included in the uplink communication data transmitted from the mobile station 7. The area 18 (interference area) that may interfere with the uplink communication of the mobile station 7 that is already communicating when the uplink communication is performed with any of the above is calculated. Area 18 is a part of the service area 12.

The calculation method of the area 18 may be any method, and for example, the control unit 24 may calculate the area 18 within a radius of 10 km centered on the position of the mobile station 7. The distance from the mobile station 7 is not limited to 10 km, and is calculated in advance from an actually measured or known approximate expression of radio wave propagation loss (for example, Egli expression) and an actual station.

The central device 10 includes the information of the area 18 calculated by the control unit 24 in the downlink communication data used for communication with the mobile station 7 and transmits the information to the base stations 1 to 5. Since the service area 12 is constructed by a multi-station simultaneous transmission method, the base stations 1 to 5 transmit the same data to the mobile station. Since the mobile station 9 exists in the service area 12, it is possible to receive the downlink communication data including the information of the area 18 sent from any of the base stations 1 to 5.

The receiving unit 21 of the mobile station 9 receives the downlink communication data including the information of the area 18. The control unit 23 refers to the information of the area 18 included in the downlink communication data received by the reception unit 21 and the position of the mobile station 9 detected by the position detection unit 22, and the mobile station 9 is in the area 18. Determine if it exists within. Then, when the control unit 23 determines that the mobile station 9 exists in the area 18, the control unit 23 suspends the transmission of the uplink communication data to any of the base stations 1 to 5. On the other hand, when the control unit 23 determines that the mobile station 9 exists in an area 19 other than the area 18 in the service area 12, the control unit 23 transmits uplink communication data to any of the base stations 1 to 5. conduct. The area 19 is an area in which there is almost no possibility of interfering with the uplink communication of the mobile station 7 when the mobile stations other than the mobile station 7 perform the uplink communication with any of the base stations 1 to 5.

In the above, the case where the information of the area 18 calculated by the central device 10 is notified to the mobile station 9 has been described, but the information of the area 19 may be notified to the mobile station 9. Further, in the above, the case where the control unit 24 of the central device 10 calculates the area 18 has been described, but the central device 10 does not calculate the area 18 and simply notifies the mobile station 9 of the position of the mobile station 7. The control unit 23 of the mobile station 9 may calculate the area 18 based on the position of the mobile station 7.

<Effect>
From the above, according to the first embodiment, the mobile station that intends to newly start communication with the base station receives the downlink communication data transmitted from the central device via the base station. This makes it possible to determine whether or not there is a possibility of interfering with the uplink communication of the mobile station that is already communicating. As a result, the mobile station existing in the area where there is no possibility of interfering with the uplink communication of the mobile station already in communication can perform the uplink communication. Therefore, in the service area constructed by adopting the multi-station simultaneous transmission method, a plurality of mobile stations can simultaneously communicate with the base station, and the effect of increasing the frequency utilization efficiency can be obtained.

<Embodiment 2>
In the first embodiment, the central device calculates an area where another mobile station may interfere with the uplink communication of the mobile station already communicating, based only on the position information of the mobile station already communicating. The case was explained. In the second embodiment, the central device considers the reception strength in the base station and calculates an area that may interfere with the uplink communication of the mobile station that is already communicating according to the transmission power of the mobile station. It is characterized by.

FIG. 4 is a diagram showing an example of the configuration of the mobile communication system according to the second embodiment. The mobile communication system according to the second embodiment has a service area 12 that employs a multi-station simultaneous transmission method, as in the first embodiment. The mobile stations 7 and 9 exist in the service area 12.

The central device 10 is communicably connected to the base stations 1 to 5 via a wired network. The device 11 is communicably connected to the central device 10, and makes a call or data communication with the mobile stations 7 and 9 existing in the service area 12 via the base stations 1 to 5 and the central device 10. It is possible to do. Although one device 11 is shown in FIG. 1, there may be a plurality of devices 11.

FIG. 5 is a block diagram showing an example of the configuration of the mobile station 7. As shown in FIG. 5, the mobile station 7 is characterized in that the transmitting unit 20 has a gain adjusting unit 29 and the receiving unit 21 has a gain adjusting unit 30. Since other configurations and operations are the same as those in the first embodiment, detailed description thereof will be omitted here. Although FIG. 5 shows the configuration of the mobile station 7 as a representative, the mobile station 9 also has the same configuration.

The gain adjusting units 29 and 30 adjust the gain. There are two types of gain, for example, a rated gain and a 10 dB reduction gain. The gain adjusting units 29 and 30 change the gain according to the reception strength of the downlink communication data received from the base station. Specifically, the gain adjusting units 29 and 30 adopt the rated gain when they exist far from the base station already communicating with the mobile station, and when they exist near the base station already communicating with the mobile station. Adopts a 10 dB drop gain. As a result, it is possible to avoid saturation of the receiving circuits in the base stations 1 to 5 and the mobile stations 7 and 9, and prevent deterioration of communication quality.

FIG. 6 is a block diagram showing an example of the configuration of the base station 1. As shown in FIG. 6, the base station 1 includes a transmission unit 31 and a reception unit 32. Further, the receiving unit 32 has a receiving electric field strength output unit 33. Although FIG. 6 shows the configuration of the base station 1 as a representative, the base stations 2 to 5 also have the same configuration.

The transmission unit 31 transmits downlink communication data to the mobile stations 7 and 9. The receiving unit 32 receives the uplink communication data from the mobile stations 7 and 9. The received electric field strength output unit 33 outputs the received electric field strength when the uplink communication data is received from the mobile stations 7 and 9 to the central device 10.

<Operation>
Next, the operation of the mobile communication system according to the second embodiment will be described with reference to FIG. It is assumed that the mobile station 7 exists in the radio zone 13 of the base station 1. Further, it is assumed that the mobile station 7 has already started communication with the base station 1 and is making a call or data communication with the device 11 via the central device 10.

The transmission unit 20 of the mobile station 7 includes its own position information detected by the position detection unit 22 in the uplink communication data and transmits it to the base station 1. The base station 1 adds the received electric field strength when the uplink communication data is received to the uplink communication data received from the mobile station 7, and transmits the uplink communication data to the central device 10.

The control unit 24 of the central device 10 includes the position information of the mobile station 7 included in the uplink communication data transmitted from the mobile station 7 and the received electric field strength output by the received electric field strength output unit 33 of the base station 1. Calculates the area that may interfere with the uplink communication of the mobile station 7 that is already communicating when the mobile station other than the mobile station 7 performs the uplink communication with any of the base stations 1 to 5. do. More specifically, the control unit 24 interferes with the uplink communication of the mobile station 7 that is already communicating when the mobile station other than the mobile station 7 performs the uplink communication with any of the base stations 1 to 5. As a possible area, when the mobile station trying to newly start communication performs uplink communication at the rated output, and when the mobile station trying to newly start communication lowers by 10 dB and performs uplink communication. Calculate the two areas of and.

In the example of FIG. 4, the area 25 (interference area) interferes with the uplink communication of the mobile station 7 that is already communicating when the mobile station that is about to newly start the communication performs the uplink communication at the rated output. Indicates the area that may be used. Area 26 indicates an area where there is almost no possibility of interfering with the uplink communication of the mobile station 7 already in communication when the mobile station to newly start the communication performs the uplink communication at the rated output. There is. The area 27 (interfering area) may interfere with the uplink communication of the mobile station 7 that is already communicating when the mobile station that is about to newly start the communication reduces the value by 10 dB and performs the uplink communication. Shows the area. Area 28 indicates an area in which there is almost no possibility of interfering with the uplink communication of the mobile station 7 already in communication when the mobile station to newly start the communication reduces the value by 10 dB and performs the uplink communication. ing.

The calculation method of the area 25 and the area 27 may be any method. , The transmission power of the mobile station may be input and calculated. In this case, the transmission power of the mobile station may be included in the uplink communication data. Areas 26 and 28 are areas other than areas 25 and 27 in the service area 12.

The central device 10 includes the information of the areas 25 and 27 calculated by the control unit 24 in the downlink communication data used for communication with the mobile station 7 and transmits the information to the base stations 1 to 5. Since the service area 12 is constructed by a multi-station simultaneous transmission method, the base stations 1 to 5 transmit the same data to the mobile station. Since the mobile station 9 exists in the service area 12, it is possible to receive the downlink communication data including the information of the areas 25 and 27 sent from any of the base stations 1 to 5.

The control unit 23 of the mobile station 9 determines the transmission gain of the uplink communication data according to the reception strength of the downlink communication data. Then, the control unit 23 refers to the information of the areas 25 and 27 included in the downlink communication data received by the reception unit 21 and the position of the mobile station 9 detected by the position detection unit 22, and is a mobile station. It is determined whether or not 9 exists in the areas 25 and 27. Then, when the control unit 23 determines that the mobile station 9 exists in the areas 25 and 27, the control unit 23 suspends the transmission of the uplink communication data to any of the base stations 1 to 5. On the other hand, when the control unit 23 determines that the mobile station 9 exists in the areas 26 and 28 other than the areas 25 and 27 in the service area 12, the control unit 23 communicates uplink to any of the base stations 1 to 5. Send data.

For example, when the mobile station 9 exists in the vicinity of the base station 1 already communicating with the mobile station 7, the transmission gain of the uplink communication data transmitted from the mobile station 9 is set to be reduced by 10 dB. Then, when the mobile station 9 exists in the area 27 shown in FIG. 4, the transmission of the uplink communication data to any of the base stations 1 to 5 is suspended.

For example, when the mobile station 9 is located far from the base station 1 as shown in FIG. 1, the reception strength of the downlink communication data received by the mobile station 9 from the base station 1 is small, so that the mobile station 9 is vulnerable to interference. Further, in the first embodiment, since the transmission output of the mobile station to newly start communication is not considered, the control unit 24 of the central device 10 is rated for the transmission output of the mobile station to newly start communication. The area is calculated on the assumption that it is an output. Therefore, mobile stations that are about to start new communication are limited to a considerable distance.

On the other hand, as shown in FIG. 4, when the mobile station 7 exists in the vicinity of the base station 1, the received electric field strength in the base station 1 is large, so that it is resistant to interference. In the second embodiment, since the central device 10 calculates the area in consideration of the received electric field strength of the base station 1, an area wider than that of the first embodiment can be calculated as an area where there is no possibility of interference. Further, in the second embodiment, the control unit 24 of the central device 10 calculates the area where there is a possibility of interference in consideration of the transmission output of the mobile station that is about to newly start communication, so that the transmission power is 10 dB. For the reduced mobile station, a wider area can be calculated as an area where there is no possibility of interference.

<Effect>
From the above, according to the second embodiment, the same effect as that of the first embodiment can be obtained. Further, in consideration of the received electric field strength in the base station and the transmission gain in the mobile station, it is possible to determine whether or not there is a possibility of interfering with the uplink communication of the mobile station already in communication. Therefore, since it is determined that an area wider than that of the first embodiment is an area where there is no possibility of interference, the effect of further improving the frequency utilization efficiency can be obtained.

<Embodiment 3>
In the first and second embodiments, the case where it is determined whether or not the mobile station to newly start the communication can communicate with the base station has been described. In the third embodiment, when a plurality of mobile stations communicate with each other in one service area, how to process the uplink communication data received by each base station in the service area will be described.

FIG. 7 is a diagram showing an example of the configuration of the mobile communication system according to the third embodiment. The mobile communication system according to the third embodiment has a service area 12 that employs a multi-station simultaneous transmission method, as in the first and second embodiments. The mobile stations 7 and 9 exist in the service area 12. It is assumed that the mobile station 7 has already started communication with the base station 1 and is making a call or data communication with the device 11 via the central device 10. Further, it is assumed that the mobile station 9 also starts communication with the base station by the method described in the first or second embodiment.

The central device 10 is communicably connected to the base stations 1 to 5 via a wired network. The device 11 is communicably connected to the central device 10, and makes a call or data communication with the mobile stations 7 and 9 existing in the service area 12 via the base stations 1 to 5 and the central device 10. It is possible to do. Although one device 11 is shown in FIG. 1, there may be a plurality of devices 11.

It is assumed that the base station 1 receives high-quality uplink communication data from the mobile station 7, and the base station 4 receives high-quality uplink communication data from the mobile station 9. Further, it is assumed that the base station 2 receives low-quality uplink communication data from the mobile station 7, and the base station 5 receives low-quality uplink communication data from the mobile station 9. It is assumed that the base station 3 interferes with the uplink communication data of the mobile station 7 and the mobile station 9, and cannot receive the respective uplink communication data.

In the conventional multi-station simultaneous transmission method, since only one mobile station can communicate with the base station in one service area, the communication quality is the best among the uplink communication data received by each base station. Uplink communication data, that is, the uplink communication data having a strong received electric field strength and using an error correction function or an error detection function such as CRC, should be selected and adopted only for the most probable uplink communication data. However, when there are a plurality of mobile stations capable of communicating with the base station in one service area, it is necessary to adopt all the uplink communication data from each mobile station. On the other hand, when a plurality of base stations receive the same uplink communication data, it is necessary to discard unnecessary uplink communication data in order to avoid duplication.

In the third embodiment, the control unit 24 of the central device 10 moves to each base station 1 to 5 with the base station group 34 (base stations 1 and 2) that receives the uplink communication data from the mobile station 7. Notifies the base station group 35 (base stations 4 and 5) that may receive uplink communication data from mobile stations other than station 7. In the base station group 34, one of the most probable data is selected from the uplink communication data received by the base stations 1 and 2 included in the base station group 34 and transmitted to the central device 10. Further, in the base station group 35, one of the most probable uplink communication data is selected from the uplink communication data received by the base stations 4 and 5 included in the base station group 35, and the central device 10 is used. Send. The base station 3 not included in the base station groups 34 and 35 does not transmit the received uplink communication data to the central device 10.

Here, a method of selecting one of the most probable data from the uplink communication data received by each base station included in the base station group will be described. In addition to the received uplink communication data, the base station transfers the index (electric field strength, error correction index, error detection index) at the time of receiving the uplink communication data to another base station. Transfer only the data with the best indicator. For example, when each base station is connected in a row and relays data (uplink communication data and an index when the uplink communication data is received) in a bucket, the data sent from the upstream base station and its own By comparing with the data and transferring the better data to the downstream base station, the most probable uplink communication data can be selected. Further, when each base station is connected in a star shape, the most probable uplink communication data can be selected because the device in the hub portion has a data sorting function.

The control unit 24 of the central device 10 has, for example, a base station group 34 that exists within a predetermined range from the base station 1 that receives high-quality uplink communication data from the mobile station 7. It may be set as. The base station group 35 may be set in the same manner.

In the third embodiment, the control unit 24 of the central device 10 notifies the base stations 1 to 5 of the base station groups 34 and 35, and in the transmission process from the base stations 1 to 5 to the central device 10, the base station group The case where the uplink communication data transmitted from each of a plurality of mobile stations is transmitted to the control unit 24 of the central device 10 by selecting the most probable uplink communication data for each is described, but the present invention is not limited to this. do not have. For example, the control unit 24 of the central device 10 does not notify the base stations 1 to 5 of the base station groups 34 and 35, and aggregates the uplink communication data received by all the base stations 1 to 5 into the central device 10. You may. In this case, the most probable uplink communication data among the uplink communication data transmitted from each base station that received the uplink communication data from the mobile station 7 is adopted as the uplink communication data from the mobile station 7. Uplink communication from base stations other than mobile station 7 is the most probable uplink communication data among the uplink communication data transmitted from each base station that received uplink communication data from base stations other than mobile station 9. It may be adopted as data.

<Effect>
From the above, according to the third embodiment, a plurality of base stations communicating with a plurality of mobile stations in one service area are grouped as a base station group for each mobile station. As a result, duplication of data transmitted from each base station to the central device can be reduced. Further, even in the service area where the multi-station simultaneous transmission method is adopted, since a plurality of mobile stations can simultaneously transmit the uplink communication data, the effect of improving the frequency utilization efficiency can be obtained.

<Hardware configuration>
Each function of the transmission unit 20, the reception unit 21, the position detection unit 22, and the control unit 23 in the mobile stations 7 and 9 described in the first embodiment is realized by the processing circuit. That is, the mobile stations 7 and 9 include a processing circuit for transmitting uplink communication data, receiving downlink communication data, detecting a position, and controlling each component. The processing circuit may be dedicated hardware, and is a processor (CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, DSP) that executes a program stored in a memory. It may also be called Digital Signal Processor).

When the processing circuit is dedicated hardware, as shown in FIG. 8, the processing circuit 36 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, or an ASIC (Application Specific Integrated Circuit). , FPGA (Field Programmable Gate Array), or a combination thereof may realize each function of the corresponding transmission unit 20, reception unit 21, position detection unit 22, and control unit 23 in the processing circuit 36, respectively. Each function may be collectively realized by one processing circuit 36.

When the processing circuit 36 is the processor 37 shown in FIG. 9, each function of the transmission unit 20, the reception unit 21, the position detection unit 22, and the control unit 23 is realized by software, firmware, or a combination of software and firmware. The firmware. The software or firmware is written as a program and stored in the memory 38. The processor 37 realizes each function by reading and executing the program recorded in the memory 38. That is, the mobile stations 7 and 9 eventually execute a step of transmitting uplink communication data, a step of receiving downlink communication data, a step of detecting a position, and a step of controlling each component. A memory 38 for storing a program is provided. Further, it can be said that these programs cause a computer to execute the procedures or methods of the transmission unit 20, the reception unit 21, the position detection unit 22, and the control unit 23. Here, the memory is, for example, a non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), magnetic disk, flexible disk. , Optical discs, compact discs, DVDs (Digital Versatile Discs), etc., or any storage medium used in the future.

For each function of the transmission unit 20, the reception unit 21, the position detection unit 22, and the control unit 23, some functions are realized by dedicated hardware, and other functions are realized by software or firmware. It is also good.

As described above, the processing circuit can realize each of the above-mentioned functions by hardware, software, firmware, or a combination thereof.

In the above, the hardware configuration of the mobile stations 7 and 9 shown in FIG. 2 has been described, but the hardware of the central device 10 shown in FIG. 3, the mobile stations 7 and 9 shown in FIG. 5, and the base station 1 shown in FIG. The same applies to the hardware configuration.

Within the scope of the present disclosure, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted.

1-5 base stations, 6 trains, 7 mobile stations, 8 trains, 9 mobile stations, 10 central devices, 11 equipment, 12 service areas, 13-17 radio zones, 18, 19 areas, 20 transmitters, 21 receivers, 22 Position detection unit, 23 Control unit, 24 Control unit, 25-28 area, 29,30 Gain adjustment unit, 31 Transmitter unit, 32 Receiver unit, 33 Received electric field strength output unit, 34,35 Base station group, 36 Processing circuit , 37 processors, 38 memories.

Claims (8)

A mobile communication system including a plurality of base stations, a plurality of mobile stations capable of wireless communication with each of the base stations by a multi-station simultaneous transmission method, and a central device communicably connected to each of the base stations.
The mobile station in communication, which is the mobile station communicating with the base station, transmits the position information of the mobile station in communication to the central device via the base station.
The central device calculates an obstruction area that may interfere with the communication of the mobile station during communication based on the position information of the mobile station during communication, and the calculated information on the obstruction area is used for each of the base stations. A mobile communication system that transmits to each of the mobile stations via. The base station adds the electric field strength received from the mobile station during communication to the position information and transmits it to the central device.
The mobile communication system according to claim 1, wherein the central device calculates the interference area for each transmission power that can be changed by the mobile station based on the position information and the received electric field strength. There are a plurality of mobile stations during communication,
The central device grouped and grouped a group of base stations including a plurality of the base stations that may receive data from one of the communication mobile stations based on the position information of each communication mobile station. The mobile communication system according to claim 1, wherein the data received by one of the base stations included in the base station group is adopted. The said used in a mobile communication system including a plurality of base stations, a plurality of mobile stations capable of wireless communication with each said base station by a multi-station simultaneous transmission method, and a central device communicably connected to each said base station. There is a mobile station,
The mobile station in communication, which is the mobile station communicating with the base station, transmits the position information of the mobile station in communication to the central device via the base station.
Information on the interference area that may interfere with the communication of the mobile station during communication, calculated by the central device based on the position information of the mobile station during communication, is transmitted from the central device via each base station. The mobile station to receive. The interference area for each transmission power that can be changed by the mobile station, which is calculated by the central device based on the position information and the electric field strength received from the mobile station during communication, is set in the central device via each base station. The mobile station according to claim 4, which is received from. The said used in a mobile communication system including a plurality of base stations, a plurality of mobile stations capable of wireless communication with each said base station by a multi-station simultaneous transmission method, and a central device communicably connected to each said base station. It ’s a base station,
The position information of the communication mobile station received from the communication mobile station, which is the mobile station communicating with the base station, is transmitted to the central device.
A base station that transmits to each of the mobile stations information on an interference area that may interfere with the communication of the mobile station during communication, which is calculated by the central device based on the position information of the mobile station during communication. The electric field strength received from the mobile station during communication is added to the position information and transmitted to the central device.
Claimed to transmit the interference area for each transmission power that can be changed by the mobile station to each mobile station, which is calculated by the central device based on the position information and the electric field strength received from the mobile station during communication. The base station according to 6. There are a plurality of mobile stations during communication,
Receives information on a group of base stations including a plurality of the base stations that may receive data from one of the communication mobile stations grouped by the central device based on the position information of each communication mobile station. ,
The base station according to claim 6, wherein the data received by one of the base stations included in each base station group is transmitted to the central device.

Images