JP2003032170A - Device and method for identifying disturbing wave source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily identify a base station of a sender for transmitting a wireless signal being a disturbing wave to a certain cell. SOLUTION: A reception circuit 2 receives a wireless signal from a mobile phone system. A 1st demodulation circuit 3 tries to demodulate a signal received by the reception circuit 2 as a signal from a base station of cells other than a cell of a present position. Then a disturbing wave source identification circuit 4 identifies a base station being a sender of a signal able to be demodulated by the 1st demodulation circuit 3 as a sender of the disturbing wave.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interference wave source specifying device and an interference wave source specifying method for specifying a transmission source of an interference wave at each point of a cell type mobile telephone system.

[0002]

2. Description of the Related Art In a cell type mobile telephone system, since communication is performed in a plurality of cells in substantially the same band, a radio signal from a base station of another cell may become an interfering wave causing interference. There is a nature.

That is, in addition to a base station that controls a certain point, a large number of base stations are arranged within a range where a radio signal can reach that point, so that the base stations of cells other than the cell at that point are operating conditions. Even if the communication is performed as described, the radio signal from the base station may become an interfering wave depending on the operating conditions.

Therefore, when the cause of the poor radio wave condition at a certain point in the cell is interference due to the radio signal from the base station of another cell, the base station transmitting the radio signal as an interfering wave. Need to be specified and the operating conditions (output, directivity, etc.) of the base station must be adjusted.

[0005]

However, there is a problem that it is difficult to easily identify the base station that is the source of the radio signal that is an interfering wave for a certain cell. For example, even if the radio field intensity of the frequency band used by the mobile telephone system is measured at that point, it is difficult to easily identify the base station that is the transmission source of the radio signal that is the interfering wave.

The present invention has been made in view of the above problems, and it is possible to easily identify a base station that is a transmission source of a radio signal that is an interfering wave for a certain cell. The purpose is to obtain a device and a method for identifying an interference wave source.

[0007]

In order to solve the above problems, the interference wave source identifying device of the present invention includes a receiving circuit for receiving a radio signal of a mobile telephone system, and a signal received by the receiving circuit. A first demodulation circuit that attempts demodulation as a signal from a base station in a cell other than the cell at the current position, and the base station that is the source of the signal that can be demodulated by the first demodulation circuit is identified as the source of the interfering wave. And an interfering wave source identifying circuit that operates.

By using this interfering wave source identifying device, it is possible to easily identify the base station of the transmission source of the radio signal which is an interfering wave with respect to a certain cell in the cell type mobile telephone system.

Further, in addition to the interference wave source specifying device of the present invention, the interference wave source specifying device of the present invention is characterized in that the first demodulation circuit is provided when the mobile telephone system adopts the CDMA method as the multi-access method. , Demodulation is attempted by the spread code of each base station by spectrum despreading.

By using this interference wave source identifying device, it is possible to efficiently attempt demodulation corresponding to a plurality of base stations in a mobile telephone system which employs a CDMA system as a multiple access system.

Further, in the interference wave source specifying device of the present invention, in addition to the interference wave source specifying device of each of the above inventions, the first demodulation circuit is received as a signal from a base station of a cell adjacent to the cell at the current position. The demodulated signal is tried.

When this interference wave source identifying device is used, the base station for which demodulation is attempted is further limited to the base station having a high possibility of the interference wave source, so that the demodulation corresponding to the base station can be performed efficiently in a short time. You can try.

Further, in the interference wave source identifying device of the present invention, in addition to the interference wave source identifying devices of the above inventions, the first demodulation circuit is received as a signal from a base station located within a predetermined distance from the current position. The demodulated signal is tried.

If this interference wave source identifying device is used, the base station to be demodulated is further limited to the base station having a high possibility of the interference wave source, so that the demodulation corresponding to the base station can be performed efficiently in a short time. You can try.

Further, the interference wave source identifying device of the present invention is, in addition to the interference wave source identifying devices of the above inventions, a second demodulation for demodulating a signal received by the receiving circuit as a signal from the base station of the cell at the current position. Based on the circuit and the signal demodulated by the second demodulation circuit, it is determined whether or not the radio signal from the base station of the cell at the current position is interfered with another radio signal, and the signal is disturbed. In this case, an interference detection circuit for operating the first demodulation circuit and the interference wave source identification circuit is provided.

By using this interference wave source identifying device, it is possible to determine whether or not interference has occurred based on the demodulated signal as in the case of a mobile telephone which is an actual machine, and to accurately identify the point of interference. Can be detected.

Further, in addition to the interference wave source specifying device of each of the above inventions, the disturbance wave source specifying device of the present invention includes a position detecting means for detecting the current position, a current position detected by the position detecting means, and an interference wave source specifying circuit. And a recording unit that records the base station, which is the interference wave source specified by the above, in association with each other.

When this interference wave source specifying device is used, the position of the interference is collectively specified by installing this device on a moving body or by having an operator carry it in the area. It becomes possible. Further, in the post-processing, by collectively adjusting the operating conditions (output, directivity, etc.) of the base station based on the data, it is possible to collectively adjust the operating conditions of a large number of base stations. .

Further, in addition to the interference wave source specifying devices of the above inventions, the interference wave source specifying device of the present invention excludes the base station of the cell of the handover destination from the interference wave source when the handover is possible at the current position. It is something that is done.

By using this interference wave source identifying device, it is possible to prevent the base station of the handover destination cell from being mistakenly used as the interference wave source when the handover is possible.

Further, in addition to the interference wave source specifying device of each of the above inventions, the interference wave source specifying device according to the present invention, when the current position is in the overlapping portion of a plurality of cells adjacent to each other, The cells at the current position are all used.

By using this disturbance source identifying device, it is possible to prevent a base station, which may accommodate a mobile telephone, from accidentally becoming a disturbance source in the overlapping portion of cells.

The method for identifying a disturbing wave source according to the present invention includes the steps of receiving a radio signal of a mobile telephone system, and attempting to demodulate the received signal as a signal from a base station of a cell other than the cell at the current position, The step of identifying the base station, which is the transmission source of the demodulatable signal, as the transmission source of the interfering wave.

By using this interference wave source identification method, in the cell type mobile telephone system, it is possible to easily identify the base station of the transmission source of the radio signal which is an interference wave for a certain cell.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1. 1 is a block diagram showing a configuration of an interference wave source identifying device according to Embodiment 1 of the present invention. In FIG. 1, an antenna 1 is an antenna that senses radio waves from one or a plurality of base stations, and a receiving circuit 2
Is a high-frequency circuit that receives radio signals from one or a plurality of base stations at each point of a cell type mobile telephone system (cellular phone system, PHS (Personal Handyphone System), car telephone system, etc.).

The first demodulation circuit 3 is a circuit that attempts to demodulate the signal received by the receiving circuit 2 as a signal from a base station of a cell other than the cell at the current position.

Further, the interfering wave source identifying circuit 4 is a circuit for identifying the base station, which is the source of the signal that can be demodulated by the first demodulating circuit 3, as the source of the interfering wave.

Further, the interception cell designating circuit 5 identifies the cell at the present position based on the signal received by the receiving circuit 2, and first attempts to demodulate the signal from the base station of the cell other than that cell. 2 is a circuit for controlling the demodulation circuit 3 of FIG.

Next, the operation of the above apparatus will be described. FIG. 2 is a diagram showing an example of the configuration of cells in the area of the mobile telephone system.

In the area of the mobile telephone system shown in FIG. 2, hexagonal cells under the control of each base station are arranged without gaps. The device 201 is the jamming source identification device itself of the first embodiment or a moving body such as a car or a bicycle equipped with the jamming source identification device of the first embodiment.
The cell 111 is the cell at the current position, and the base station 101 is the base station of the cell 111.

Around the cell 111, adjacent cells 112-1 to 112-6 as well as cells 11 on the outside thereof are provided.
3 are arranged, and the base stations 102-1 to 102-
Reference numeral 6 is a base station of cells 112-1 to 112-6, and base station 103 is a base station of cell 113.

Here, the operation of the above-mentioned device will be described based on the cell configuration of FIG. 2, but the arrangement, number and shape of cells in the area are not limited to those of FIG.

First, the receiving circuit 2 operates in the frequency band used by the mobile telephone system to generate base stations (base stations 101, 10).
2-1 to 102-6, 103, etc.) is received via the antenna 1, and the received signal is supplied to the first demodulation circuit 3 and the interception cell designating circuit 5.

The interception cell designating circuit 5 identifies the cell 111 at the present position on the basis of the received signal, and the cell 111 is identified.
Other cells (cells 112-1 to 112-6, 113, etc.) are searched, the first demodulation circuit 3 is controlled, and the base stations (base stations 102-1 to 102-6, 103) of those cells are searched.
, Etc.) and try to demodulate the received signal.

At this time, the interception cell designating circuit 5, for example,
Cells 112-1 to 11 adjacent to the cell 111 at the current position
2-6 tries to demodulate the received signal as a signal from the base stations 102-1 to 102-6.

Alternatively, the interception cell designating circuit 5 detects the current position by a position detecting means such as a GPS receiver (not shown), and the base stations 102-1 to 102-2 within the predetermined range 121 from the current position. As a signal from -6 and 103, demodulation of the received signal is tried. It should be noted that the predetermined range 121 depends on the frequency band used in the mobile communication system, the radio wave output from the base station, and the like.
It may be determined based on the reachable distance of the radio wave used in this mobile communication system.

Then, the first demodulation circuit 3 tries to demodulate the received signal as a signal from these base stations, and supplies the signal after the demodulation process to the interference wave source identification circuit 4.

For example, this mobile telephone system uses the multiple access method as a CDMA (Code Division Multiplex).
When the access method is adopted, the interception cell designating circuit 5 identifies the cell 111 at the current position from the signal of the so-called perch channel, and the demodulation circuit 3 designates the interception cell designating circuit 5. Each base station (base station 102-
1 to 102-6) each of which is used to despread and demodulate the signal obtained by demodulating the perch channel signal. The signal of the perch channel means each base station (base station 101, 102-1).
, 102-6, 103, etc.), and is a signal that has been spread spectrum with a spreading code unique to each base station, and is used for location registration of mobile phones.

It should be noted that IMT2000 (International Mobile Telecommu
Since the CDMA system is also adopted in the nications 2000), the present invention can be applied to the mobile phone system.

The interfering wave source identifying circuit 4 detects the successfully demodulated signal among the supplied signals after the demodulating process, and identifies the base station designated during the demodulating process of the signal as the interfering wave source. , Output the result. At this time, the interference wave source identifying circuit 4 may, for example, when the demodulated signal is obtained at a predetermined level or higher, when the S / N ratio of the demodulated signal is a predetermined value or higher, or If the demodulated signal is a predetermined signal, it is determined that the demodulation has succeeded. The output may be displayed by a display unit (not shown) or recorded by a recording unit (not shown).

Although the first demodulation circuit 3 and the interception cell designating circuit 5 are described separately in the first embodiment, the interception cell designating circuit 5 may be incorporated in the first demodulation circuit 3. But of course it is okay.

As described above, according to the first embodiment, the receiving circuit 2 receives the radio signal of the mobile telephone system, and the first demodulating circuit 3 receives the signal received by the receiving circuit 2 from the current position. Cells other than cell 111 (cell 112-1
˜112-6, 113, etc.), the interference wave source identifying circuit 4 tries to demodulate as a signal from the base station.
The base station that is the transmission source of the signal that can be demodulated by is specified as the transmission source of the interfering wave. As a result, in the cell-type mobile telephone system, it is possible to easily specify the base station that is the transmission source of the radio signal that is an interfering wave for a certain cell.

Further, according to the first embodiment, the mobile telephone system is the CDM as the multiple access system.
The first demodulation circuit 3 employs the A system, and each base station (base station 102-
1 to 102-6, 103, etc.), so as to try demodulation by spread spectrum despreading,
In a mobile telephone system adopting a CDMA system as a multiple access system, it is possible to efficiently attempt demodulation corresponding to a plurality of base stations.

Furthermore, according to the first embodiment, the first
If the demodulation circuit 3 attempts to demodulate a signal received as a signal from a base station of a cell adjacent to the cell at the current position, the base station to be demodulated may possibly be an interfering wave source. Since it is limited to high base stations, it is possible to attempt demodulation corresponding to the base stations efficiently in a short time.

Furthermore, according to the first embodiment, the first
If the demodulation circuit 3 attempts to demodulate a received signal as a signal from a base station located within a predetermined distance from the current position, the base station to be demodulated may possibly be an interfering wave source. Since it is limited to high base stations, it is possible to attempt demodulation corresponding to the base stations efficiently in a short time.

Embodiment 2. The interference wave source identifying device according to the second embodiment of the present invention demodulates a signal from the base station of the cell at the current position, determines whether the demodulated signal has interference, and determines whether interference has occurred. Only, the identification of the interference wave source is performed.

FIG. 3 is a block diagram showing the structure of the interference wave source identifying device according to the second embodiment of the present invention. In FIG. 3, the second demodulation circuit 11 is a circuit that demodulates the signal received by the reception circuit 2 as a signal from the base station 101 of the cell 111 at the current position.

Further, the interference detection circuit 12 determines whether the radio signal from the base station 101 of the cell 111 at the current position is interfered with by another radio signal based on the signal demodulated by the second demodulation circuit 11. It is a circuit that determines whether or not the first demodulation circuit 3, the interfering wave source specifying circuit 4, and the interception cell designating circuit 5 are operated when receiving interference.

The other constituent elements in FIG. 3 are the same as those in the first embodiment (FIG. 1), and the description thereof will be omitted.

Next, the operation of the above device will be described.

The second demodulation circuit 11 converts the signal received by the reception circuit 2 into the base station 10 of the cell 111 at the current position.
It demodulates as a signal from 1 and supplies the demodulated signal to the interference detection circuit 12.

In the interference detection circuit 12, the radio signal from the base station 101 of the cell 111 at the current position is transmitted to the other base stations 102-1 to 102-6, 103 based on the demodulated signal.
It is determined whether or not there is interference from a radio signal from the

At this time, the jamming detection circuit 12 determines whether the signal after demodulation contains noise due to interference in a predetermined ratio or more, or when the level of the signal after demodulation is lower than the predetermined level. It is determined that the radio signal from the base station 101 of the cell 111 at the position is disturbed by another radio signal.

Then, the jamming detection circuit 12 determines that the radio signal from the base station 101 of the cell 111 at the current position is disturbed by the radio signals from other base stations 102-1 to 102-6, 103. If determined, a predetermined control signal is supplied to operate the first demodulation circuit 3, the interfering wave source identification circuit 4, and the interception cell designation circuit 5.

When the first demodulation circuit 3, the interfering wave source specifying circuit 4 and the interception cell designating circuit 5 receive the predetermined control signal, the interfering wave source is specified as described in the first embodiment.

The first demodulation circuit 3 and the second demodulation circuit 11 may be realized as one demodulation circuit. In that case, if the multiple access method is the CDMA method, the spreading code at the time of despreading may be changed in one demodulation circuit.

As described above, according to the second embodiment, the second demodulation circuit 11 demodulates the signal received by the reception circuit 2 as a signal from the base station 101 of the cell 111 at the current position. The interference detection circuit 12 determines, based on the signal demodulated by the second demodulation circuit 11, whether or not the radio signal from the base station 101 of the cell 111 at the current position is interfered with another radio signal. If there is interference, the first demodulation circuit 3 and the interference wave source identification circuit 4
To operate. As a result, similarly to the mobile phone which is the actual device, it is possible to determine whether or not the interference has occurred based on the demodulated signal, and it is possible to accurately detect the point of interference.

Third Embodiment The interference wave source identifying device according to the third embodiment of the present invention records a position where interference is occurring and a base station, which is the interference wave source, in association with each other.

FIG. 4 is a block diagram showing the structure of the interference wave source identifying device according to the third embodiment of the present invention. In FIG. 4, the antenna 21 is a GPS (Global Position) not shown.
ioning System) An antenna that senses radio waves from satellites.

The GPS receiver 22 is a GP (not shown).
The position detecting means receives a signal from the S satellite via the antenna 21 and detects the current position.

Further, the recording device 23 includes the interference detection circuit 1
When a disturbance is detected by 2, the apparatus records the disturbance on the recording medium 31 in association with the position of the disturbance and the base station that is the source of the disturbance. The recording medium 31 includes a RAM, a flash ROM, a hard disk drive, a flexible disk, and a CD-R (CompactDis).
A writable recording medium such as a c-Readable) or MO (Magneto Optical) disk is used.

Since the other constituent elements in FIG. 4 are the same as those in the second embodiment (FIG. 3), description thereof will be omitted.

Next, the operation of the above device will be described.

When the interference detection circuit 12 detects interference,
Output a predetermined control signal. Upon receiving the control signal, the first demodulation circuit 3, the interfering wave source specifying circuit 4, and the interception cell specifying circuit 5 specify the interfering wave source as described in the first embodiment, and the base station which is the interfering wave source. Is supplied to the recording device 23.

On the other hand, when the GPS receiver 22 receives the control signal, the GPS receiver 22 detects the current position at that time and supplies the position information to the recording device 23.

The recording device 23 records the information of the base station from the interference wave source specifying circuit 4 and the position information from the GPS receiver 22 in the recording medium 31 in association with each other.

In this way, each time an interference is detected, the information of the base station from the interference source specifying circuit 4 and the GPS
The positional information from the receiver 22 is associated and sequentially recorded in the recording medium 31.

Since the other operations are the same as those in the second embodiment, the description thereof will be omitted.

In the third embodiment, when a disturbance is detected by the disturbance detecting circuit 12, the position where the disturbance is generated and the base station which is the source of the disturbance are recorded in the recording medium 31 in association with each other. However, these data may be transmitted to a collection center (not shown) by wireless communication and the data may be recorded at the collection center.

As described above, according to the third embodiment, the GPS receiver 22 detects the current position, and the recording device 2
3 is the current position detected by the GPS receiver 22,
The base station, which is the source of the interference wave identified by the interference wave source identification circuit 4, is recorded in association with the base station. This makes it possible to collectively specify points of interference in the area by installing the apparatus on a moving body such as an automobile or carrying it by an operator and moving in the area. Also, in post-processing, by collectively adjusting the operating conditions (output, directivity, etc.) of the base station based on these data,
The operating conditions of a large number of base stations can be collectively adjusted easily.

In the above first to third embodiments, when the handover is possible at the current position, the base station of the handover destination cell may be excluded from the interference wave source. In that case, when handover is possible, it is possible to prevent the base station of the handover destination cell from being mistakenly used as an interfering wave source.

Further, in the above-described first to third embodiments, when the current position is in the overlapping portion of a plurality of cells which are adjacent to each other, all of the plurality of cells are set as the cell of the current position. Good. In that case, in the overlapping part of the cell, it is possible to prevent the base station, which may accommodate the mobile telephone, from accidentally becoming the interference source.

In the above first to third embodiments,
Although the CDMA system is mentioned as an example of the multiple access system of the mobile telephone system, the multiple access system is not limited to this. Also, in the case of the CDMA system, the perch channel signal is used to search for the base station that is the transmission source of the radio signal that is the interfering wave, but there are other channels for which the spreading code is already known. If so, the signal of that channel may be used.

[0075]

According to the present invention, in a cell type mobile telephone system, an interference wave source identification device capable of easily identifying a base station which is a transmission source of a radio signal which is an interference wave for a cell. And a method for identifying the interference wave source can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an interference wave source identifying device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a configuration of cells in an area of a mobile phone system.

FIG. 3 is a block diagram showing a configuration of an interference wave source identifying device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an interference wave source identifying device according to a third embodiment of the present invention.

[Explanation of symbols]

2 Receiver circuit 3 First demodulation circuit 4 Interfering wave source identification circuit 101, 102-1 to 102-6, 103 Base station 111, 112-1 to 112-6, 113 cells 11 Second demodulation circuit 12 Interference detection circuit 22 GPS receiver (position detection means) 23 Recording Device (Recording Means)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kunio Arakawa             3-5-18 Kitazawa, Setagaya-ku, Tokyo Stocks             Company Takayamauchi F-term (reference) 5K042 AA06 CA02 CA12 CA23 DA01                       DA19 EA15 FA11                 5K067 AA03 AA33 BB04 CC10 DD43                       EE02 EE10 LL01 LL11

Claims (9)

[Claims] 1. A jamming wave source identifying device for identifying a transmission source of a jamming wave at each point of a cell type mobile telephone system, comprising: a receiving circuit for receiving a radio signal of the mobile telephone system; First, an attempt is made to demodulate the generated signal as a signal from a base station of a cell other than the cell of the current position.
And a jamming wave source specifying circuit that specifies the base station, which is the transmission source of the signal that can be demodulated by the first demodulation circuit, as the transmission source of the jamming wave. . 2. The mobile telephone system adopts a CDMA system as a multiple access system, and the first demodulation circuit attempts demodulation by spectrum despreading with a spreading code of each base station. The interference wave source identifying device according to claim 1. 3. The first demodulation circuit attempts to demodulate the received signal as a signal from a base station of a cell adjacent to the cell of the current position.
The disturbance source identification device described. 4. The first demodulation circuit attempts to demodulate the received signal as a signal from a base station located within a predetermined distance from the current position.
The disturbance source identification device described. 5. The signal received by the receiving circuit,
A second demodulation circuit that demodulates as a signal from the base station of the cell at the current position, and based on the signal demodulated by the second demodulation circuit,
It is determined whether or not the radio signal from the base station of the cell at the current position is interfered with by another radio signal, and if the radio signal is interfered, the first demodulation circuit and the interference wave source identification circuit are An interference detection circuit for operating the interference wave source identification device according to claim 1. 6. A position detecting means for detecting the current position, the current position detected by the position detecting means, and a base station which is an interference wave source specified by the interference wave source specifying circuit are recorded in association with each other. The interfering wave source identifying device according to claim 1, further comprising: a recording unit. 7. The disturbance source identification device according to claim 1, wherein the base station of the handover destination cell is excluded from the disturbance sources when the handover is possible at the current position. 8. The disturbance according to claim 1, wherein when the current position is in an overlapping portion of a plurality of cells adjacent to each other, all of the plurality of cells are set as the cell of the current position. Wave source identification device. 9. A method for identifying an interfering wave source for identifying a source of an interfering wave at each point of a cell-based mobile telephone system, the method comprising: receiving a radio signal of the mobile telephone system; A step of attempting demodulation as a signal from a base station of a cell other than the cell of the current position, and a step of identifying the base station that is the transmission source of the signal that can be demodulated as the transmission source of the interference wave, Interfering wave source identification method.