JP2011130080A - Radio system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio system that is adapted to be able to determine an electric field strength on a plurality of travelling direction lines in a short period of time. <P>SOLUTION: A plurality of mobile station radio devices 5A, 5B, 5C are mounted on a moving vehicle 4 to move on different travelling direction lines 1A, 1B, 1C. When a frame channel signal 6 transmitted from a base station radio device 2 is received in a zone from a measuring start position 8A to a measuring end position 8B, the mobile station radio devices 5A, 5B, 5C use respective different activation channels A1, A2, A3 of an activation channel signal 7 to respond to the base station radio device 2. In a responding signal processing section 12 of the base station radio device 2, an electric field intensity is determined when the responding signal is received, and positional data calculated in a positional data processing section and the determined electric field intensity data are stored in a storage section 14 for each activation channel A1, A2, A3 in association with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radio system used when measuring electric field strength while performing time division communication between a base station radio apparatus installed on the ground side and a mobile station radio apparatus mounted on a measurement vehicle.

  In order to realize services that improve vehicle safety, transportation efficiency, and comfort, the goal is a driving support road traffic system (AHS) that integrates roads and vehicles, and future Internet connections. Development of a Dedicated Short Range Communication (DSRC) system used in the smart gateway system (SGW) described above is underway. This wireless system uses wireless communication performed between a base station wireless device that is installed on the road and communicates wirelessly and a mobile station wireless device mounted on a mobile body that is a vehicle. Realization is expected. In such a system, it is necessary to perform an electric field strength measurement test in order to grasp whether a communication area has a correct electric field strength when a base station radio apparatus is installed or during maintenance inspection.

  A wireless system that performs a conventional electric field strength measurement test is a configuration in which one mobile station wireless device is mounted on a moving body that travels on a traveling path in which a base station wireless device is installed. When the mobile station travels while performing time-division wireless communication between the base station radio apparatus and the mobile station radio apparatus, and the mobile station radio apparatus receives the frame channel signal from the base station radio apparatus, the mobile station radio apparatus The provided field strength measuring unit measures the field strength, and transmits the measured received field strength data to the base station radio apparatus using the activation channel (see, for example, Patent Document 1).

JP 2009-164876 A

  However, in the conventional wireless system, when the electric field strength measurement test is performed while the mobile body is traveling between the measurement start position and the measurement end position determined on the travel path, the traveling direction line of the mobile station wireless device mounted on the mobile body Only the electric field distribution data corresponding to can be acquired. Therefore, when acquiring electric field distribution data in a plurality of different traveling direction lines, the moving body is driven a plurality of times so that the traveling direction line is different between the measurement start position and the measurement end position. Measurement of the electric field strength in the direction line had to be performed, which required a lot of labor and time.

  An object of the present invention is to provide a wireless system capable of measuring electric field strengths of a plurality of traveling direction lines in a short time.

  In order to achieve the above object, the present invention provides a radio system comprising a base station radio apparatus that communicates by radio and a mobile station radio apparatus that is mounted on a mobile body and communicates with the base station radio apparatus by radio. A plurality of mobile station radio devices are mounted at different positions in the traveling direction lines of the mobile body, and the base station radio device is connected to the plurality of mobile station radio devices when the mobile body reaches a predetermined position. A transmission unit that transmits the request signal, a reception unit that receives response signals from the plurality of mobile station radio devices in response to the request signal, and a response that measures each electric field strength of the response signal received by the reception unit A signal processing unit; and a position data processing unit that associates each field strength data measured by the response signal processing unit with the position data from which the response signal has been transmitted. .

  According to the radio system of the present invention, a plurality of mobile station radio devices are mounted at positions that are different in the traveling direction lines of the mobile body, and each mobile station radio device responds to a request signal from the base station radio device. When the response signal is transmitted, the base station wireless device measures the electric field strength of the response signal by the response signal processing unit, and the position data processing unit associates the position data with the electric field strength data measured by the response signal processing unit. The field intensity data and the position data can be extracted for each traveling direction line. For this reason, the electric field strength data for each of a plurality of traveling direction lines corresponding to a plurality of mobile station radio devices can be acquired in a single operation by only one run from the measurement start position to the measurement end position by the mobile body. Compared to the conventional case where only one mobile station radio device is mounted on a mobile body and the mobile body is repeatedly driven for each traveling direction line to acquire electric field strength data, the measurement is completed in a short time. can do.

FIG. 1 is a plan view showing a wireless system according to an embodiment of the present invention. FIG. 2 is a side view of the wireless system shown in FIG. FIG. 3 is a block diagram showing the base station radio apparatus shown in FIG. FIG. 4 is a block diagram showing the mobile station radio apparatus shown in FIG. FIG. 5 is an explanatory diagram of a communication frame in the wireless system shown in FIG. FIG. 6 is a characteristic diagram showing an example of an electric field intensity distribution curve acquired by the wireless system shown in FIG.

1 and 2 are a plan view and a side view showing a configuration of a wireless communication system according to an embodiment of the present invention.
A DSRC base station radio apparatus 2 is installed on the road side of the road 1, and its antenna 3 is located on the road 1. In addition, a plurality of mobile station radio apparatuses 5A, 5B, and 5C that perform radio communication with the base station radio apparatus 3 are mounted on the mobile body 4 that is a measurement vehicle that travels on the travel path 1. Here, each mobile station radio device 5A, 5B, 5C is arranged in the mobile body 4 so that when the mobile body 4 travels on the travel path 1, it travels on different traveling direction lines 1A, 1B, 1C. Three mobile station radio apparatuses 5A, 5B, 5C are juxtaposed in a direction orthogonal to the traveling direction. The base station radio apparatus 2 continuously transmits a frame channel signal 6 that is a request signal a plurality of times to the mobile unit 4 side, and the mobile unit 4 that receives the frame channel signal 6 receives an activation signal that is a response signal. Station channel signal 7 is transmitted to base station radio apparatus 2.

FIG. 3 is a block diagram showing a schematic configuration of the base station radio apparatus 2.
The base station radio apparatus 2 continuously transmits a request signal to the mobile body 4 side multiple times with the antenna 3 that performs bi-directional radio communication with each mobile station radio apparatus 5A, 5B, and 5C in a time-sharing manner. A request signal processing unit 9 that performs processing, a transmission unit 10 that wirelessly transmits a request signal from the request signal processing unit 9 to the mobile body 4 through the antenna 3, and a request signal from the base station radio apparatus 2 A receiving unit 11 that receives a response signal from the mobile unit 4 side, a response signal processing unit 12 that measures an electric field strength when receiving an activation channel signal 7 that is a response signal, and a frequency at which a request signal is transmitted The position data processing unit 13 for calculating the position data of the moving body 4 from each data such as the data of the measurement start position 8A shown in FIG. 1 and the number of times the received response signal corresponds to the request signal, and the response Signal processor 12 A storage unit 14 for storing the electric field intensity data measured for each response signal and the position data calculated for each response signal by the position data processing unit 13; and an electric field distribution characteristic described later operated by an inspector of the base station It has the operation display part 15 which can display a curve etc., and the control part 16 which controls these each part.

FIG. 4 is a block diagram showing a schematic configuration of the mobile station radio apparatus 5A configured in the mobile body 1. As shown in FIG.
The mobile station radio apparatus 5A includes an antenna 17 for transmitting and receiving radio signals between the base station radio apparatus 2 and the mobile station radio apparatus 5A, a changeover switch 18 for switching transmission / reception, and the base station radio apparatus 2 A receiving unit 19 that receives the frame channel signal 6 that is a request signal, a request signal processing unit 20 that processes the request signal through the receiving unit 19, and a storage unit that stores the individual ID and the like of the mobile station radio device 5A itself 21, an operation display unit 22 used when an inspector of the moving body 4 displays predetermined information, and a response signal processing unit that processes a response signal for the request signal received by the request signal processing unit 20 23, a transmission unit 24 that transmits a response signal from the response signal processing unit 23 through the changeover switch 18 and the antenna 17, and controls these units according to a control program And a control unit 25. The other mobile station radio apparatuses 5B and 5C have the same configuration as that of the mobile station radio apparatus 5A, and a description thereof is omitted here.

FIG. 5 is an explanatory diagram of a communication frame.
The base station radio apparatus 2 continuously transmits the frame channel signal 6 by time-division radio communication, and each mobile station radio apparatus 5A, 5B, 5C mounted on the mobile body 4 has received this frame channel signal 6. At this time, the activation channel signal 7 is transmitted to the base station radio apparatus 2 as the response signal.

  The frame channel signal 6 includes control information necessary for communication with the mobile station radio apparatuses 5A, 5B, and 5C. The activation channel signal 7 includes control information necessary for communication with the base station radio device 2, individual IDs of the mobile station radio devices 5A, 5B, and 5C. The activation channel signal 7 has six channels A1 to A6 as shown in the figure, and each of the mobile station radio apparatuses 5A, 5B, 5C has an activation channel at their specific location. A1, A2 and A3 are designated in advance. Here, the activation channel A1 is set for the mobile station radio apparatus 5A, the activation channel A2 is set for the mobile station radio apparatus 5B, and the activation channel A2 is set for the mobile station radio apparatus 5C. Each of the channel channels A3.

  Now, when the moving body 4 reaches the measurement start position 8A shown in FIG. 1, the electric field strength measurement process is started. The mobile station radio apparatus 5A that has received the frame channel signal 6 from the base station radio apparatus 2 uses a predetermined activation channel A1, and sends back a response signal as an activation channel signal 7 from the transmitter 24 through the antenna 17. Further, the mobile station radio device 5B uses the predetermined activation channel A2 shown in FIG. 5, and the mobile station radio device 5C uses the predetermined activation channel A3 shown in FIG. A predetermined response signal. The base station radio apparatus 2 continuously transmits the frame channel signal 6 a plurality of times until reaching the measurement end position 8B from the measurement start position 8A. In response to this, the mobile station radio devices 5A, 5B and 5C similarly use the activation channels A1, A2 and A3 to transmit the activation channel signal 7 as a response signal to the base station radio device 2 until the measurement end position 8B is reached. To do.

  The base station radio apparatus 2 starts the electric field strength measurement process in response to the response signal from the mobile body 4, and continuously performs the electric field strength measurement until the mobile body 4 reaches the measurement end position 8B. First, when the base station radio apparatus 2 receives a response signal that is an activation channel signal 7 from the mobile station radio apparatuses 5A to 5C during the electric field intensity measurement, the response signal processing unit 12 measures the electric field intensity of the received response signal. Then, the measured electric field strength data is associated with the position data obtained by calculating the position of the moving body 4 when the position data processing unit 13 transmits the same response signal, and the response from which mobile station radio devices 5A to 5C Each of the activation channels A1, A2, and A3 that specify the signal is stored in the storage unit 14. At this time, the position where the mobile unit 4 has transmitted the activation channel signal 7 is a request signal which is a frame channel signal 6 that the base station radio apparatus 2 requests the mobile unit 4 to transmit the activation channel signal 7. Since the activation channel signal 7 when the mobile unit 4 responds to the request signal is associated, the frequency at which the predetermined frame channel signal 6 is output as described above, the measurement start position 8A, the received activation channel The position data processing unit 13 can use the signal 7 or the like for calculation. The electric field strength measurement and the storage process in the base station radio apparatus 2 are continuously performed until the moving body 4 reaches the measurement end position 8B from the measurement start position 8A.

  Thus, when the moving body 4 reaches the measurement end position 8B from the measurement start position 8A and the electric field strength measurement and storage processing in the base station radio apparatus 2 is completed, the activation channel A1 is stored in the storage unit 14 of the base station radio apparatus 2. , A2, and A3, the measured electric field strength data and the position data calculated by the position data processing unit 13 are associated with each other and held over the entire measurement range from the measurement start position 8A to the measurement end position 8B.

  After that, when the inspector of the base station radio device 2 observes the electric field distribution of the traveling direction line 1A acquired by the mobile station radio device 5A, among the items stored in the storage unit 14 by operating the operation display unit 15, The evasion channel A1 is extracted. Then, for example, as shown in FIG. 6, the vertical axis indicates the electric field strength, the horizontal axis indicates the distance in the traveling direction of the moving body 4, and the position data and the electric field strength data associated with the activation channel A1 are The electric field distribution characteristic curve 26 in the communication range from the measurement start position 8A to the measurement end position 8B on the traveling direction line 1A can be plotted. The inspector can display the electric field distribution characteristic curve 26 on the display unit and observe the electric field distribution of the traveling direction line 1A.

  Also, when the inspector of the base station radio apparatus 2 observes the electric field distribution of the traveling direction line 1B acquired by the mobile station radio apparatus 5B, among the items stored in the storage unit 14 by operating the operation display unit 15, The evasion channel A2 is extracted. Thereafter, in the same manner as described above, the electric field distribution characteristic curve in the communication range from the measurement start position 8A to the measurement end position 8B on the traveling direction line 1B can be obtained.

  Similarly, when the inspector of the DSRC base station radio apparatus 2 observes the electric field distribution of the traveling direction line 1C acquired by the mobile station radio apparatus 5C, the operation display unit 15 is operated and stored in the storage unit 14. Of these, the activation channel A3 is extracted, and then the electric field distribution characteristic curve in the communication range from the measurement start position 8A to the measurement end position 8B on the traveling direction line 1C is set in the same manner as described above. it can.

  As described above, the wireless system of the present invention is located on the moving body 4 traveling on the traveling path 1 on the different traveling direction lines 1A, 1B, 1C at the time of traveling, and from the base station wireless device 2. A plurality of mobile station radio devices 5A, 5B, and 5C that send back an activation channel signal 7 as a response signal when the frame channel signal 6 is received are mounted, and each mobile station radio device 5A, 5B, and 5C Each activation channel signal 7 is transmitted using different predetermined activation channels A 1, A 2, A 3, while the base station radio apparatus 2 transmits the electric field of each activation channel signal 7. Since the intensity is measured and the measurement data is stored in the storage unit 14 in association with the position data, the base station radio apparatus 2 performs the desired activation. It is possible to extract the channels only, it is possible to obtain the electric field intensity distribution curve from the measurement start position 8A by using the position data and the field strength data to the measurement end position 8B easily.

  According to the radio system having such a configuration, while using a plurality of mobile station radio devices 5A, 5B, and 5C, the mobile station radio devices 5A, 5B, and 5C are not provided with electric field strength measuring means, Since the field intensity is measured from the response signals from the mobile station radio apparatuses 5A, 5B, and 5C on the station radio apparatus 2 side, the configuration of the entire radio system can be simplified.

  Moreover, the moving body 4 can grasp the electric field strength distribution of the plurality of traveling direction lines 1A, 1B, 1C by a single run from the measurement start position 8A to the measurement end position 8B. Therefore, in the conventional method, only one mobile station radio apparatus is mounted on the moving body 4, and the electric field distribution data is acquired by running the measurement vehicle 4 for each of the plurality of traveling direction lines 1A, 1B, and 1C. In comparison, the time required to acquire the electric field distribution can be greatly shortened. For this reason, when the traveling path 1 cannot be occupied for a long time in order to measure the received electric field strength, and when it is intended to obtain the received electric field strength corresponding to a plurality of traveling direction lines, the electric field strength measurement is very effective. It becomes a test method.

  In the above-described embodiment, the mobile station radio apparatus 5A uses the activation channel A1, the mobile station radio apparatus 5B uses the activation channel A2, and the mobile station radio apparatus 5C uses the activation channel A3. Although it is specified in advance to use, any of the activation channels A1 to A6 may be used. In the above-described embodiment, the activation channels A1, A2, and A3 used by the mobile station radio apparatuses 5A, 5B, and 5C are designated in advance. However, the vacant activation channels A1 to A6 are designated. Any one of these may be used each time to transmit a response signal. Further, in accordance with these changes, an individual ID or other method may be used to identify which traveling direction line 1A to 1C corresponds to the response signal from the mobile station radio apparatus 5A to 5C. Furthermore, the number of traveling direction lines 1A to 1C and mobile station radio apparatuses 5A to 5C can be determined without being limited to three in the case of the above-described embodiment.

  The present invention is not limited to the configurations of the base station radio apparatus and mobile station radio apparatus shown in FIGS. 3 and 4 but can be applied to other configurations.

DESCRIPTION OF SYMBOLS 1 Traveling path 1A-1C Traveling direction line 2 Base station radio | wireless apparatus 3 Antenna 4 Mobile body 5A-5C Mobile station radio | wireless apparatus 6 Frame channel signal 7 Activation channel signal 8A Measurement start position 8B Measurement end position 9 Request signal processing part DESCRIPTION OF SYMBOLS 10 Transmission part 11 Reception part 12 Response signal processing part 13 Position data processing part 14 Storage part 15 Operation display part 16 Control part 17 Antenna 18 Changeover switch 19 Reception part 20 Reception signal processing part 21 Storage part 22 Operation display part 23 Transmission signal processing Unit 24 transmission unit 25 control unit 26 electric field intensity distribution curve

Claims (1)

  In a wireless system comprising a base station wireless device that communicates wirelessly and a mobile station wireless device that is mounted on a mobile body and communicates wirelessly with the base station wireless device, a plurality of mobile units move to different positions on the mobile body A base station radio apparatus is mounted, and the base station radio apparatus responds to the request signal with a transmitter that transmits request signals to the plurality of mobile station radio apparatuses when the mobile body reaches a predetermined position. A receiving unit that receives response signals from the plurality of mobile station radio devices, a response signal processing unit that measures each electric field strength of the response signal received by the receiving unit, and each electric field strength that is measured by the response signal processing unit A wireless system comprising: a position data processing unit that associates data with the position data that has transmitted the response signal.

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