JP2002064443A - Reception electric field measuring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reception electric field measuring system for measuring test radio waves transmitted from a plurality of wireless stations without arranging operators in the wireless stations. SOLUTION: The system is provided with a plurality of wireless stations 1a-1n which are connected through a wired line 2 and have respective identification numbers, and a measuring apparatus 5 which selects a desired wireless station among the wireless stations, transmits a transmission signal including a control command for instructing the transmission of the identification number of the selected station and the test radio wave by wireless and measures the test radio wave transmitted from the wireless station. Upon receiving the transmitted radio wave and recognizing that the identification number is the identification number of the self station, the wireless station transmits a response command for showing that the signal is received and the test radio wave to the measuring apparatus by wireless.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reception electric field measurement system for measuring radio waves transmitted from a plurality of radio base stations, and more particularly to a reception electric field measurement system from a plurality of radio base stations installed along a station or a railway line like a train radio system. The present invention relates to a reception electric field measurement system for measuring radio waves.

[0002]

2. Description of the Related Art Conventionally, when performing wireless communication between a running train and a plurality of wireless base stations installed along a station or a railway line as in a train wireless system, a transmission wave transmitted from each wireless base station is used. In some cases, a radio wave blind zone may be generated due to radio wave interference or in a place with steep terrain such as a mountainous area.

For this reason, conventionally, when a radio base station is installed,
In addition, by performing a reception electric field measurement test at regular intervals, the installation location and transmission output of each radio base station are adjusted so that radio waves from the radio base station can be received evenly by trains running along the railway. I was

[0004]

By the way, in the conventional reception electric field measurement test, a test radio wave is transmitted from each radio base station while performing radio communication between a measurement device moving along the road and a plurality of radio base stations. Then, the receiving electric field of the test radio wave is measured by a measuring device.

[0005] For this reason, an operator is arranged at the measuring device and the radio base station, and the measurement operation is performed by manually operating the measuring device and the radio base station while performing radio communication between the operators. As described above, in the related art, a worker must be arranged not only in the measuring device but also in each wireless base station. Therefore, there has been a problem that work efficiency is poor on a route having many unmanned stations or a route in a mountainous area.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and it is an object of the present invention to measure a test radio wave transmitted from each radio base station without placing a worker at the radio base station. It is intended to provide a reception electric field measurement system capable of performing the following.

[0007]

SUMMARY OF THE INVENTION A receiving electric field measuring system according to the present invention comprises a plurality of radio base stations connected through a wired line, each having an individual identification number, and a desired radio base station among the plurality of radio base stations. Wirelessly transmitting a transmission signal including a control command for instructing transmission of an identification number and a test radio wave, and measuring a test radio wave transmitted from the selected wireless base station, and receiving the transmission signal. The wireless base station configured to wirelessly transmit a response command indicating that a transmission signal has been received and a test radio wave to the measuring device if the identification number is the own station.

With this configuration, when the measuring apparatus selects an arbitrary radio base station, it outputs a transmission signal including an instruction to transmit a test radio wave to the selected radio base station. If the wireless base station that has received the transmission signal is the wireless base station selected by itself, it will wirelessly transmit a response command indicating that the transmission signal has been received and a test radio wave to the measuring device.

A receiving electric field measuring system according to the present invention comprises a plurality of radio base stations connected through a wired line, each of which has an individual identification number, a desired radio base station selected from the plurality of radio base stations, and identification thereof. Wirelessly transmitting a transmission signal including a control command for instructing the transmission of a number and a test radio wave, and a measuring device for measuring a test radio wave transmitted from the selected radio base station, the radio base station receiving the transmission signal, If the identification number is not the local station, the transmission signal is transferred through a wired line, and when a response command indicating that the transmission signal has been received from the selected wireless base station is received through the wired line, the response command is wirelessly transmitted to the measuring device. have.

With this configuration, when the measuring apparatus selects an arbitrary radio base station, it outputs a transmission signal including an instruction to transmit a test radio wave to the selected radio base station. If the radio base station that has received this transmission signal is not the radio base station selected by itself, the radio base station transfers the transmission signal to the selected radio base station through a wired line, and a response command indicating that the transmission signal has been received is transmitted to the radio base station. When the response command is transferred to the measuring device, the response command is wirelessly transmitted to the measuring device.

A receiving electric field measuring system according to the present invention comprises a plurality of radio base stations connected through a wired line, each having a unique identification number, and selecting a desired radio base station from the plurality of radio base stations to identify the radio base station. And a measuring device for wirelessly transmitting a transmission signal including a control command for instructing transmission of a number and a test radio wave, and measuring a test radio wave transmitted from the selected radio base station. When the base station receives the transmission signal from the wireless base station that has received the transmission signal through the wired line, the base station returns a response command indicating that the transmission signal has been received through the wired line to the wireless base station that has received the transmission signal, and performs the test. It has a configuration for wirelessly transmitting radio waves to a measuring device.

With this configuration, when the measuring apparatus selects an arbitrary radio base station, it outputs a transmission signal including an instruction to transmit a test radio wave to the selected radio base station. If the selected wireless base station cannot receive the transmission signal, it receives a transmission signal from the wireless base station that has received the transmission signal through a wired line, transmits a test radio wave wirelessly, and further responds to the reception of the transmission signal. The command is transmitted to the wireless base station that has received the transmission signal via the wired line.

In the reception electric field measurement system of the present invention, a radio base station receiving a transmission signal not addressed to the own station adds the identification number of the own station to the transmission signal as a source base station number and transfers the transmission signal through a wired line. When a response command to which the identification number of the own station is added as a source base station number is received via a wired line, the response command is wirelessly transmitted to the measuring device.

According to this configuration, when the radio base station that has received the transmission signal is not the selected radio base station, the radio base station adds its own identification number to the transmission signal as the reception source base station number, and transmits the signal to the wired line. When the response command to which the identification number of the own station is added as the receiving base station number is transferred, the response command is wirelessly transmitted to the measuring device.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a received electric field measuring system according to the present invention, and shows a train radio system as an example. In the figure, a plurality of radio base stations 1
a, 1b, 1c,..., 1n-1 and 1n are installed at predetermined locations along a station or along a railway line, and are connected in series to each other through a wired line 2. The terminal wireless base station 1n is connected to the central unit 3, and the central unit 3 accommodates the communication device 4.

Each of the radio base stations 1a to 1n includes a radio transmission / reception device and a control device. The radio base stations 1a to 1n perform radio transmission / reception with the measurement device 5 moving along the road, and also transmit and receive the other radio base stations and the central unit through the wired line 2. Transmission and reception are performed with the device 3. The wireless base stations 1a to 1n are individually assigned identification numbers so as to be higher in order from the wireless base station 1a to the wireless base station 1n.

The measuring device 5 includes a radio transmitting / receiving device, a receiving electric field measuring device, an operating device, and a control device.
When the operator selects an arbitrary wireless base station using the operating device while moving along the railway, the measuring device 5 wirelessly transmits a control command for instructing the selected wireless base station to transmit a test radio wave. The measuring device 5 receives a radio wave from the selected wireless base station, and measures the received electric field with the received electric field measuring device.

Next, the operation of the reception electric field measurement system according to the present embodiment will be described with reference to the sequence diagram shown in FIG.

First, in the measuring device 5, an operator selects a radio base station for which measurement of a received electric field is desired (step S1). In this example, the radio base station 1c is selected. In response to the instruction, the control device of the measuring device 5 wirelessly transmits a transmission signal addressed to the wireless base station 1c from the wireless transmitting device (step S).
2).

As shown in the format diagram of FIG. 3, the transmission signal is a synchronization signal F1, which acquires synchronization of the transmission signal.
Control code F2 for identifying data, measuring device 5
The destination base station number F3 for writing the identification number of the wireless base station (the wireless base station 1c in this example) selected in the above step, and the relay information F used when relaying between the wireless base stations via the wired line 2.
4. Processing contents F5 indicating the contents of the command. For this reason, the relay information F4 is not used at the time of wireless transmission from the measuring device 5.

The relay information F4 includes a relay base station number F41, which is the identification number of the relay base station, and a measuring device 5
And a receiving base station number F42, which is an identification number of the wireless base station that has received the transmission signal from the base station. The relay destination base station number F41 is a number obtained by subtracting “1” from the identification number of the own station when relaying from the own station to the lower station, and “1” is added to the identification number of the own station when relaying from the own station to the upper station. "Is added.

When a transmission signal designating the wireless base station 1c is wirelessly transmitted from the measuring device 5, the radio wave is received by, for example, the nearby wireless base station 1a. Since the processing content F5 of the received transmission signal is a control command, the wireless base station 1a compares the destination base station number F3 with its own identification number (step S3).

As a result of the comparison, since the two identification numbers do not match, as shown in the explanatory diagram of FIG. 4, the wireless base station 1a sets the relay base station number F41 to its own identification number with "+1" added to its own identification number. Is written in the receiving base station number F42, and is transferred to the upper wireless base station 1b through the wired line 2 (step S4).

The radio base station 1b receives the transmission signal because the relay destination base station number F41 of the transmission signal transmitted from the radio base station 1a via the wired line 2 is the identification number of its own station. Then, since the processing content F5 is a control command, the destination base station number F3 is compared with its own identification number (step S5).

As a result of the comparison, since the two identification numbers do not match, as shown in the explanatory diagram of FIG. 5, the radio base station 1b sets the relay destination base station number F41 to the identification number obtained by adding “+1” to the identification number of its own station. Is written and transferred to the upper wireless base station 1c through the wired line 2 (step S6).

The radio base station 1c receives this transmission signal because the relay base station number F41 of the transmission signal transmitted from the radio base station 1b via the wired line 2 is its own identification number. Then, since the processing content F5 is a control command, the destination base station number F3 is compared with the identification number of the own station (step S7).

As a result of the comparison, the two identification numbers match,
The wireless base station 1c determines that the signal is a transmission signal addressed to itself, and prepares for processing according to the processing content F5. That is, since the content of the processing content F5 is a control command for instructing transmission of the test radio wave, the wireless base station 1c prepares for it.

Further, the radio base station 1c simultaneously processes a response command indicating that a transmission signal addressed to itself has been received.
5 is written to the destination base station number F41, and the identification number obtained by adding “−1” to the identification number of the own station is written to the relay destination base station number F41. At this time, the contents of the transmission destination base station number F3 and the reception source base station number F42 are unchanged (step S8).

The radio base station 1b receives this transmission signal because the relay destination base station number F41 of the transmission signal transmitted from the radio base station 1c via the wired line 2 is the identification number of its own station. Then, since the processing content F5 is a response command, the receiver identification number F42 is compared with the identification number of the own station (step S9).

As a result of the comparison, since the two identification numbers do not match, as shown in the explanatory diagram of FIG. 6, the radio base station 1b sets the identification number of the relay base station number F41 to "-1" as its own identification number. The number is written and transferred to the lower wireless base station 1b through the wired line 2 (step S10).

The radio base station 1a receives this transmission signal because the relay base station number F41 of the transmission signal transmitted from the radio base station 1b through the wired line 2 is the identification number of the own station. Then, since the processing content F5 is a response command, the receiver identification number F42 is compared with the identification number of the own station (step S11).

As a result of the comparison, the two identification numbers match,
The wireless base station 1a determines that the signal is a transmission signal addressed to itself, and prepares for processing according to the processing content F5. That is, since the content of the processing content F5 is a response command, the wireless base station 1a wirelessly transmits the response command as shown in the explanatory diagram of FIG. 7 (step S12).

When the measuring device 5 receives the response command,
A response from the wireless base station 1c is displayed (step S13). As a result, the operator of the measuring device 5 can confirm that the control command has reached the selected wireless base station 1c and is preparing to transmit the test radio wave.

Next, the radio base station 1c transmits a test radio wave in response to the control command (step S14). The measuring device 5 receives the test radio wave and measures the received electric field (Step S15). Note that the measuring device 5 can confirm the response of the wireless base station 1c in step S13 even if it cannot receive the test radio wave.

As described above, according to the present embodiment, the measuring apparatus wirelessly transmits a transmission signal including an instruction to transmit a test radio wave to a selected arbitrary radio base station, and the selected radio base station transmits the transmission signal. When the transmission signal is received, the test radio wave is automatically transmitted by radio, so that the reception electric field of the test radio wave transmitted from each radio base station can be measured without placing an operator at the radio base station.

Further, the measuring apparatus can control even a radio base station in a range where radio waves cannot reach directly through another radio base station in a range where radio waves can reach directly, and additionally, a response output from the selected radio base station. Since the command can be received through another wireless base station, the operation of the selected wireless base station can be confirmed even if the test radio wave from the selected wireless base station cannot be directly received. Each wireless base station has a function of measuring its own input / output voltage and transmission power, and transmitting the measurement result in the same manner as the response command transfer.

Next, the operation of the train radio system in which the installation location of the radio base station and the transmission output are adjusted based on the measurement result of the above-mentioned reception electric field measurement system will be described with reference to the configuration diagrams and sequence diagrams shown in FIGS. It will be described using FIG.

FIG. 8 is a block diagram of a train radio system, in which a plurality of the above-mentioned radio base stations 1a to 1n are connected in series via a wired line 2, and the terminal radio base station 1n has a central station containing a communication device 4 therein. Device 3 is connected. The wireless base stations 1a to 1n perform wireless transmission and reception with an on-board wireless device 6 mounted on a train moving along the railway, and also perform transmission and reception with other wireless base stations and the central unit 3 through the wired line 2. Is configured to do so.

Next, the operation when the central unit 3 calls the on-board radio 6 of the running train will be described with reference to the sequence diagram shown in FIG.

When the person in charge at the center calls the running train from the communication device 4, the central device 3 starts simultaneous transmission (step T1). This command is transmitted to all the radio base stations 1a to 1n together with the voice signal from the communication device 4 through the wired line 2 (step T2). The radio base stations 1a to 1n that have received this instruction simultaneously transmit voice signals wirelessly at the same frequency (step T3).

When the on-vehicle radio device 6 receives a radio wave from a nearby radio base station, for example, the radio base station 1a, it outputs the received audio signal (step T4). When the train crew responds to this, transmission activation is started from the on-board radio 6 (step T5), and the transmission signal is transmitted wirelessly (step T5).
6).

When this radio wave is received by, for example, the radio base station 1a, the radio base station 1a performs a reception process such as setting a reception flag (step T7). Next, the wireless base station 1
a transfers the received signal to the central device 3 through the wired line 2 (step T8). When the received signal reaches central device 3, central device 3 outputs the voice signal received from telephone device 4 (step T9).

When the central person answers with the communication device 4, the central device 3 activates a specific transmission (step T).
10). This specific transmission activation is an instruction to wirelessly transmit a transmission signal only from the specific radio base station for which the reception flag is set, in this example, the radio base station 1a.

This instruction is transmitted to all the radio base stations 1a to 1n through the wired line 2 together with the voice signal from the communication device 4 (step T11). Upon receiving the transmission signal from the central unit 3, the wireless base station 1a performs wireless transmission (step T12). This transmission signal is received by the on-vehicle wireless device 6, and an audio signal is output (step T13). Thus, a communication path is formed between the communication device 4 and the on-vehicle wireless device 6.

In the above embodiment, the case where the received electric field measuring system of the present invention is applied to a train radio system has been described. However, the present invention is not limited to this, and a plurality of radio base stations are connected through a wired line. Of course, the present invention can be applied to any wireless system that has been used.

[0047]

As described above, according to the present invention, when a transmission signal for instructing transmission of test radio waves is transmitted from a measuring apparatus to a selected radio base station, the selected radio base station receives the transmission signal. Electric field wireless transmission of test radio waves automatically, so that it is possible to measure the received electric field of the test radio waves transmitted from the wireless base station without having to arrange workers at the wireless base station. Can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a reception electric field measurement system according to the present invention.

FIG. 2 is a sequence diagram showing an operation of the reception electric field measurement system according to the present invention.

FIG. 3 is a format diagram of a transmission signal.

FIG. 4 is an explanatory diagram showing a method of setting a relay destination base station number and a receiving source base station number;

FIG. 5 is an explanatory diagram showing a method of updating a relay destination base station number when relaying from a lower station to an upper station.

FIG. 6 is an explanatory diagram showing a method of updating a relay destination base station number when relaying from an upper station to a lower station.

FIG. 7 is an explanatory diagram in a case where a response command is a local station.

FIG. 8 is a configuration diagram showing a train radio system to which the present invention is applied.

FIG. 9 is a sequence diagram showing an operation when the central unit calls the on-board radio.

[Explanation of symbols]

 1a, 1b,..., 1n wireless base station 2 wired line 3 central device 4 communication device 5 measuring device 6 on-board radio

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Politics Hosokawa 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Hitoshi Enda 2-2-2 Yoyogi Shibuya-ku, Tokyo No. 2 Inside Tohoku Japan Railway Company (72) Inventor Tsukasa Kudo 2-2-2 Yoyogi, Shibuya-ku, Tokyo Inside Tohoku Japan Railway Company (72) Inventor Junichi Sumino 2-chome Yoyogi, Shibuya-ku, Tokyo No. 2 East Japan Railway Company F-term (reference) 5K033 AA03 BA02 BA06 CB01 CB04 CC04 DA01 DA19 DB09 DB20 EA06 EA07 5K042 AA08 CA02 CA04 CA13 CA23 EA01 EA02 FA11 LA13 NA03 5K067 AA44 BB05 CC12 DD17 EE12 EE12 HH22 LL11

Claims (4)

[Claims] 1. A plurality of wireless base stations connected through a wired line and having individual identification numbers, a desired wireless base station is selected from the plurality of wireless base stations, and the identification numbers and test radio waves are transmitted. And a measuring device for wirelessly transmitting a transmission signal including a control command for instructing the radio base station, and measuring the test radio wave transmitted from the selected radio base station. If the number is the local station, a reception electric field measurement system is configured to wirelessly transmit a response command indicating that the transmission signal has been received and the test radio wave to the measurement device. 2. A plurality of wireless base stations connected through a wired line and each having an individual identification number, a desired wireless base station selected from the plurality of wireless base stations, and transmission of the identification numbers and test radio waves. And a measuring device for wirelessly transmitting a transmission signal including a control command for instructing the radio base station, and measuring the test radio wave transmitted from the selected radio base station. If the number is not the own station, the transmission signal is transferred through the wired line, and a response command indicating that the transmission signal is received from the selected wireless base station is received through the wired line. A reception electric field measurement system having a configuration for wirelessly transmitting a command. 3. A plurality of wireless base stations connected through a wired line and each having an individual identification number, a desired wireless base station selected from the plurality of wireless base stations, and transmission of the identification numbers and test radio waves. And a measuring device for wirelessly transmitting a transmission signal including a control command for instructing the selected radio base station, and measuring the test radio wave transmitted from the selected radio base station, wherein the selected radio base station failed to receive the transmission signal. When receiving the transmission signal from the wireless base station that has received the transmission signal through the wired line, returns a response command indicating that the transmission signal has been received through the wired line to the wireless base station that has received the transmission signal. And a configuration for wirelessly transmitting the test radio wave to the measuring device. 4. The reception electric field measurement system according to claim 2, wherein the radio base station that has received the transmission signal adds an identification number of the own station to the transmission signal as a reception source base station number. It has a configuration in which the response command is wirelessly transmitted to the measuring device when the response command is transferred through the wired line and the response command added with the identification number of the own station as the reception source base station number is received through the wired line. Characteristic reception electric field measurement system.