JP2006270572A - Wireless base station system and communication control apparatus thereof, and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless base station system and a communication control apparatus thereof capable of extending a communication area and carrying out stable communication, and to provide a communication method. <P>SOLUTION: Wireless apparatuses 1a to 1d making wireless communication with on-vehicle apparatuses are connected to a communication control apparatus 2 via communication lines 3a to 3d, respectively. An uplink signal from the on-vehicle apparatus 6 is subjected to frequency conversion and the timing is adjusted by the wireless apparatuses 1a to 1d. The communication control apparatus 2 discriminates reception quality of the received signal as to each of the connected communication lines 3a to 3d and selects a communication line from which the signal is received on the basis of the discriminated reception quality. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio base station system, a communication control apparatus, and a communication method, including a plurality of antenna apparatuses that perform radio communication with an in-vehicle apparatus, and a communication control apparatus that is connected to the antenna apparatus via a wired communication line.

Conventionally, there has been an ETC system composed of an ETC (Electronic Toll Collection System) roadside device installed on the roadside of a toll gate on a toll road and an in-vehicle device mounted on the vehicle (for example, see Patent Document 1) .
JP 2004-157656 A

  However, in the road-to-vehicle communication system such as the conventional ETC system, the transmission output from the ETC roadside device is usually set larger than that of the in-vehicle device. Since the receivable area is proportional to the transmission output, when performing road-to-vehicle communication, mutual communication is possible only in the area where communication can be performed with the transmission output from the vehicle-mounted device, and the communication area becomes small. It was.

  Moreover, in such a road-to-vehicle communication system, communication is performed with a vehicle that travels at high speed. In ETC, since important processing such as billing processing is performed, stable communication in a wide communication area is desired. .

  The present invention has been made in view of the above-described conventional circumstances, and an object thereof is to provide a radio base station system capable of expanding a communication area and performing stable communication, a communication control apparatus, and a communication method thereof. .

  The communication control device of the present invention is a communication control device connected to each of a plurality of antenna devices that perform wireless communication with an in-vehicle device via a wired communication line, and each of the connected wired communication lines. Reception quality determination means for determining the reception quality of the received signal; and selection means for selecting a communication line for receiving the signal based on the reception quality determined by the reception quality determination means.

  With this configuration, since the reception quality of signals received from a plurality of antenna devices is determined and selected, the communication area can be expanded and stable communication can be performed.

  In the communication control apparatus according to the present invention, the reception quality determination means performs error determination for each slot of the received signal, and the selection means selects a communication line with few errors for each slot.

  With this configuration, since a communication line with few errors is selected for each slot, a communication line showing good reception characteristics can be selected for each slot.

  In the communication control apparatus according to the present invention, the reception quality judgment unit measures the reception field strength of the reception signal for each slot, and the selection unit selects a communication line having a strong reception field strength for each slot.

  With this configuration, since a communication line having a strong reception electric field strength is selected for each slot, a communication line showing good reception characteristics can be selected for each slot.

  In the communication control apparatus of the present invention, the selection means selects a communication line on which the synchronization signal has been normally received.

  With this configuration, a communication line that has normally received the synchronization signal is selected, so that good reception characteristics can be obtained.

  In the communication control apparatus of the present invention, the selecting means selects the connected communication lines according to the priority order.

  With this configuration, since the communication line is selected according to the priority order, a desired communication line can be selected from among the communication lines connected to the antenna device in the receivable area.

  The radio base station system of the present invention is a radio base station system that includes a plurality of antenna devices that perform radio communication with an in-vehicle device, and a communication control device that is connected to each of the antenna devices via a wired communication line, The antenna device is configured between a wireless communication unit that converts a radio signal received from the in-vehicle device into a signal in a first frequency band that is a frequency band lower than a radio frequency band, and the received communication control device. Timing adjustment means for delaying the signal subjected to the frequency conversion by a delay adjustment amount set according to a line delay amount of the wired communication line to be generated and outputting the delayed signal to the wired communication line. The control device has each means of any of the communication control devices described above.

  With this configuration, since the reception quality of signals received from a plurality of antenna devices is determined and selected, the communication area can be expanded and stable communication can be performed, and the communication line between the antenna device and the communication control device As such, an electrical cable or an optical fiber cable can be used, and the communication area can be set with a high degree of freedom by reducing costs.

  Moreover, in the radio base station system of the present invention, each of the plurality of antenna devices is installed at a position where a reception area capable of receiving a signal from the in-vehicle device overlaps a reception area of another antenna device.

  With this configuration, the communication control apparatus can perform processing as reception diversity.

  In the radio base station system of the present invention, one of the plurality of antenna devices further includes a transmission unit that transmits a signal from the communication control device.

  With this configuration, it is not necessary to separately provide an antenna device for transmission, so that the cost can be reduced and it is not necessary to secure the installation position of the antenna device.

  In the radio base station system of the present invention, the communication control device transmits a control signal to the antenna device via the wired communication line and measures a line delay amount until a response from the antenna device. And a delay adjustment amount setting means for setting and transmitting a delay adjustment amount to the antenna device based on the measured line delay amount.

  With this configuration, it is possible to measure the line delay with the antenna device and set the delay adjustment amount in the antenna device.

  The communication method of the present invention is a communication method of a communication control device connected to each of a plurality of antenna devices that perform wireless communication with an in-vehicle device via a wired communication line, and the communication method of the connected wired communication line Determining the reception quality of the signal received for each, and selecting a communication line for receiving the signal based on the reception quality determined by the reception quality determination means.

  By this method, the reception quality of signals received from a plurality of antenna devices is determined and selected, so that the communication area can be expanded and stable communication can be performed.

  A communication method of the present invention is a communication method of a radio base station system including a plurality of antenna devices that perform radio communication with an in-vehicle device, and a communication control device that is connected to each of the antenna devices via a wired communication line. A step of frequency-converting a radio signal received from the in-vehicle device into a first frequency band that is a frequency band lower than a radio frequency band; and a frequency-converted reception signal from the in-vehicle device in the communication control device A step of delaying by a delay adjustment amount set according to a line delay amount of the wired communication line generated between and a step of transmitting the delayed signal to the communication control device via the wired communication line Determining the reception quality of the signal received for each of the plurality of connected wired communication lines, and the reception determined by the reception quality determination means. Based on the quality, and a step of selecting a communication line for receiving the signal.

  By this method, the reception quality of signals received from a plurality of antenna devices is judged and selected, so that the communication area can be expanded and stable communication can be performed, and the communication line between the antenna device and the communication control device As a result, an electric cable can be used, cost can be reduced, and a highly flexible communication area can be set.

  According to the present invention, it is possible to provide a radio base station system capable of expanding a communication area and performing stable communication, a communication control apparatus thereof, and a communication method.

  FIG. 1 is an explanatory diagram showing an outline of a radio base station system according to an embodiment of the present invention. The radio base station system according to the present embodiment will be described by taking as an example a radio base station system of a road-to-vehicle communication system using a dedicated short range communication (hereinafter referred to as DSRC) system.

  As shown in FIG. 1, the radio base station system of the present embodiment includes radio devices 1a to 1d that perform radio communication with in-vehicle devices, and communications that are connected to the radio devices 1a to 1d via communication lines 3a to 3d, respectively. And a control device 2. The communication lines 3a to 3d are, for example, electric signal cables, and the transmitted signal is, for example, a baseband signal. Note that the number of wireless devices connected to the communication control device 2 is not limited to four, and an arbitrary number of one or more can be connected. In this system, the wireless devices 1a to 1d operate as antenna devices.

  The wireless devices 1a to 1d have a receiving function, and can receive signals from the in-vehicle device 6 mounted on the vehicle 5 existing in the receiving areas 4a to 4d, respectively. Moreover, the radio | wireless apparatus 1a has a transmission function, and the vehicle-mounted apparatus 6 mounted in the vehicle 5 which exists in the transmission area | region 4t can receive the signal from the radio | wireless apparatus 1a. That is, in this radio base station system, the signal from the in-vehicle device 6 can be received over almost the entire transmission area 4t, and the transmission area and the reception area are balanced. In the present embodiment, communication from the communication control device 2 to the in-vehicle device 6 is referred to as “downlink communication”, and communication from the in-vehicle device 6 to the communication control device 2 is referred to as “uplink communication”.

  Each of the wireless devices 1 is installed at a position where the reception area 4 capable of receiving a signal from the in-vehicle device overlaps the reception area 4 of another antenna device. In the example shown in FIG. 1, the reception area 4a of the wireless device 1a overlaps with the reception area 4b of the wireless device 1b and the reception area 4c of the wireless device 1c, and the reception area 4b of the wireless device 1b is the same as that of the wireless device 1a. The reception area 4a overlaps with the reception area 4c of the wireless device 1c and the reception area 4d of the wireless device 1d. The reception area 4c of the wireless device 1c includes the reception area 4b of the wireless device 1b and the reception area 4d of the wireless device 1d. The reception area 4d of the wireless device 1d overlaps the reception area 4a of the wireless device 1a, the reception area 4b of the wireless device 1b, and the reception area 4c of the wireless device 1c.

  The communication control device 2 selects a line with high reception quality from the communication lines 3a to 3d connected to the wireless apparatuses 1a to 1d that communicate with the reception areas 4a to 4d. Accordingly, processing similar to so-called reception diversity is performed, and a stable reception operation can be realized along with the expansion of the reception area.

  FIG. 2 is a block diagram showing a schematic configuration of the communication control apparatus according to the embodiment of the present invention. As shown in FIG. 2, the communication control device 2 is an example of a selection unit and is connected to the communication lines 3a to 3d and selects one of the lines, and communicates based on the DSRC frame timing. A timing generation unit 22 that generates timing for performing communication, a communication processing unit 23 that is an example of a delay adjustment amount setting unit, and a line that is an example of a line delay measurement unit and that measures line delays of the communication lines 3a to 3d A delay measuring unit 24.

  The communication processing unit 23 divides transmission data, which is downlink data, and generates a DSRC frame. Further, the DSRC frame received from the in-vehicle device 6 is restored and output as received data. The processing of transmission data and reception data may be performed by the communication control device 2 having a data processing unit, and may be performed by the data processing unit, or may be performed by a higher-level device connected via a communication network. Good.

  FIG. 3 is a block diagram showing a schematic configuration of the line selection unit according to the embodiment of the present invention. As illustrated in FIG. 3, the line selection unit 21 includes reception quality determination units 25 a to 25 d and a selection unit 26.

  The reception quality determination units 25a to 25d determine the quality of reception signals from the in-vehicle device 6 input from the communication lines 3a to 3d, respectively. The selection unit 26 selects any one of the communication lines 3a to 3d based on the reception quality determined by the reception quality determination units 25a to 25d. For example, the reception quality determination units 25a to 25d determine the reception quality for each reception slot.

  As an example of a communication line selection method, the reception quality determination units 25a to 25d perform error determination such as BCH or CRC check for each reception slot, and the selection unit 26 selects a communication line with few errors. It is done. As a result, a communication line showing good reception characteristics can be selected for each slot. For example, when one vehicle is present at a position extending over a plurality of communication areas, it is possible to select a vehicle having a preferable reception quality for each communication area. A line with few errors may be selected for each BCH code.

  Alternatively, the reception quality determination units 25a to 25d may measure the reception electric field strength of the reception signal for each reception slot, and the selection unit 26 may select a communication line having a strong reception electric field strength for each slot. As a result, a communication line showing good reception characteristics can be selected for each slot.

  Furthermore, the reception quality determination units 25a to 25d may demodulate a unique word (UW), which is an example of a synchronization signal, and the selection unit 26 may select a communication line that has received UW normally. As a result, the communication line that has received the synchronization signal normally is selected, so that good reception characteristics can be obtained.

  Moreover, the selection part 26 may select according to a priority order among the connected communication lines. Thus, a desired communication line can be selected from the receivable area.

  Next, the configuration of the wireless devices 1a to 1d will be described with reference to FIG. FIG. 4 is a block diagram showing a schematic configuration of the radio apparatus according to the embodiment of the present invention. As illustrated in FIG. 4, the wireless device 1 includes a timing adjustment unit 11, an antenna 12, a wireless processing unit 13, and a control unit 14. Note that the radio apparatuses 1a to 1d illustrated in FIG. 1 have the configuration of the radio apparatus 1 illustrated in FIG.

  The timing adjustment unit 11 is an example of a timing adjustment unit, and delays the uplink signal from the in-vehicle device 6 by a predetermined delay adjustment amount and transmits it to the communication control device 2 via the communication line 3.

  The wireless processing unit 13 is an example of a wireless communication unit, and converts the frequency of a wireless signal received from the in-vehicle device 6 via the antenna 12 into a baseband signal and outputs the signal to the timing adjustment unit 11. In the case where a transmission function for the in-vehicle device 6 is provided as in the wireless device 1 a shown in FIG. 1, the baseband signal received from the communication control device 2 is frequency-converted to a wireless frequency band, and the antenna 12 is connected. To send. The control unit 14 controls the timing adjustment unit 11 and the wireless processing unit 15, and performs a frame synchronization acquisition process with the communication control device 2.

  Next, timing adjustment of the radio base station system of this embodiment will be described. FIG. 5 is an explanatory diagram showing timing adjustment according to the embodiment of the present invention. FIG. 5 shows only two of the wireless devices 1a and 1b.

As shown in FIG. 5, the upstream communication signal transmitted from the in-vehicle device 6 and input to the antenna 12 of the wireless device 1 a is only the processing delay D 12 _u until reaching the upstream delay adjusting unit 11 via the wireless processing unit 13. The signal is input to the timing adjustment unit 11 with a delay. The uplink communication signal input to the timing adjustment unit 11 is delayed by a processing delay D _11u generated in the timing adjustment unit 11.

The timing adjusting unit 11, the input uplink communication signals, delayed by the delay adjustment amount AD _a. The uplink communication signal output from the timing adjustment unit 11 is input to the communication control apparatus 2 with a line delay d _3a in the communication line 3a.

Further, the upstream communication signal transmitted from the in-vehicle device 6 and input to the antenna 12 of the wireless device 1b is delayed by a processing delay D _12u until reaching the timing adjusting unit 11 via the wireless processing unit 13 to adjust the timing. Input to the unit 11. The uplink communication signal input to the uplink delay adjustment unit 14 of the timing adjustment unit 11 is delayed by the processing delay D _11u generated by the timing adjustment unit 11.

The timing adjusting unit 11, the input uplink communication signals, delayed by the delay adjustment amount AD _b. The uplink communication signal output from the timing adjustment unit 11 is input to the communication control apparatus 2 with a line delay d _3b in the communication line 3b.

Here, the processing of the reception system of the wireless device 1 that is the sum of the delay D _12u from the input to the antenna 12 to the input to the timing adjustment unit 11 and the uplink signal processing delay D _11u in the timing adjustment unit 11 The delay RX _d (= D _12u + D _11u ) is substantially the same time for all the wireless devices 1.

Therefore, the part of the time required for the uplink signal input to the antenna 12 to be input to the communication control apparatus 2 differs for each wireless apparatus is the line delays d _3a and d _3b . Therefore, in the present embodiment, as shown in FIG. 5, the delay adjustment amounts AD _a and AD _b in the timing adjustment unit 11 of each wireless device 1 are the sum of the line delay and the delay adjustment amount as the delay amount τ. That is, it is set so as to satisfy d _3a + AD _a = d _3b + AD _b = τ.

  Here, this delay amount τ may be assigned a specific fixed value in advance, or may be set for each base station system. If such a delay amount τ is employed, the adjustment amount in the timing adjustment unit 11 of each wireless device can be set by simply subtracting the line delay amount from the preset delay value τ.

  Further, when the communication control device and a plurality of wireless devices are connected, the largest delay amount among the measured amounts of line delay may be set as τ. In this case, the delay adjustment amount is 0 in the wireless device connected to the communication line having the largest line delay. If such a delay amount τ is employed, the delay between the communication control device 2 and the antenna 12 can be reduced.

  In this way, each wireless device 1a to 1d adjusts the delay with respect to the variation in the timing of the received signal from the in-vehicle device 6 generated by the line delay amount of the communication line 3 to be connected. Data reception timings from the wireless devices 1a to 1d in the control device 2 can be matched.

  Next, a method for setting a delay adjustment amount for timing adjustment in the wireless device 1 will be described. In the present embodiment, the communication control device 2 measures the delay amount through the communication line with each wireless device 1 and determines the delay adjustment amount for each wireless device 1 based on the result. Then, the communication control device 2 transmits the determined delay adjustment amount to each wireless device 1, and sets the delay adjustment amount determined by the wireless device 1 in the timing adjustment unit 11.

  FIG. 6 is an explanatory diagram showing an outline of the delay amount measuring method according to the embodiment of the present invention. In the present embodiment, a unique word (hereinafter referred to as UW) of a synchronization signal is used for measuring the line delay amount.

  As illustrated in FIG. 6, when the communication control device 2 outputs UW to the wireless device 1, the wireless device 1 inputs the UW to the wireless device 1 via the communication line 3 after a line delay time. The wireless device 1 returns the received UW to the communication control device 2 and outputs it. At that time, processing time occurs in the wireless device 1. In the present embodiment, this processing time is referred to as a transmission / reception frame offset. The UW output from the wireless device 1 is input to the communication control device 2 via the communication line 3 after a line delay time. The line delay measurement unit 24 of the communication control device 2 measures the amount of line delay by measuring the time from when the UW is sent until the UW as a response is input from the wireless device 1 as the transmission line delay time. I do.

Then, from the measured transmission line delay time, a delay adjustment amount to be set in each wireless device is derived and notified, and the wireless device sets the notified delay adjustment amount. Here, delay tau, the measured transmission path delay time When D _3n, since the transmission path delay time measured by the line delay measurement unit 24 is a round-trip time, the delay adjustment amount AD _n is below It is represented by the formula (1).
AD _n = τ− (D _3n / 2) (1)

  Note that the transmission / reception frame offset may be obtained in advance and subtracted from the measured value of the transmission path delay time.

  FIG. 7 is a sequence diagram showing a procedure for setting the delay adjustment amount according to the embodiment of the present invention. The delay adjustment amount is set, for example, when the radio base station system is started up. In that case, the radio apparatus 1 and the communication control apparatus 2 are in a frame synchronization loss state in which frame synchronization is not established.

  In the communication control device 2, the communication processing unit 23 sends UW at the timing of each frame generated by the timing generation unit 22 (step S101). When the control unit 16 of the wireless device 1 receives the UW transmitted from the communication control device 2, for example, three consecutive times, the control unit 16 enters the frame synchronization established state from the frame synchronization lost state (step S102).

  When the wireless device 1 receives the UW (step S103) sent from the communication control device 2 thereafter (step S104) in the frame synchronization established state, the wireless device 1 sends the UW to the communication control device 2 (step S105). When the communication control device 2 receives the UW transmitted from the wireless device 1 for example three times in succession, the communication control device 2 enters the frame synchronization established state from the frame synchronization lost state (step S106).

  When entering the frame synchronization establishment state, the communication control device 2 sends a UW and starts measuring a delay time (the above-described transmission delay time) (step S107). When receiving the UW (step S108), the wireless device 1 sends the UW to the communication control device 2 (step S109). And the communication control apparatus 2 will acquire the time which passed since it transmitted in step S107 as transmission path delay time, if UW is received (step S110).

  The communication control device 2 calculates a delay adjustment amount for the wireless device 1 based on the transmission path delay time acquired in step S110, and sends and notifies the delay adjustment amount together with the UW (step S111). When receiving the UW and the delay adjustment amount (step S112), the wireless device 1 first transmits the UW without setting the delay with the designated delay adjustment amount (step S113). The communication control device 2 receives the UW (step S114).

  Then, when the communication control device 2 sends UW (step S115), the control unit 16 of the wireless device 1 sets the delay adjustment amount received last time in the timing adjustment unit 11, and adjusts the timing with the delay adjustment amount. The UW is sent out (step S117). And the communication control apparatus 2 receives and detects UW at the timing after delay setting (step S118).

  In this way, setting of the delay adjustment amount is completed in the wireless device 1 and the communication control device 2. After that, the communication control device 2 sends UW (step S119), and when the wireless device 1 receives the UW (step S120), the wireless device 1 delays the UW by the set delay adjustment amount. The communication control apparatus 2 receives the UW at the timing after the delay setting (step S122).

  The delay adjustment amount may be set at an arbitrary timing after the system is started up. When the frame is not lost, the delay adjustment amount can be set by executing the procedure from step S107 to step S118 described above.

  As described above, the radio apparatus 1 according to the present embodiment performs frequency conversion between the radio frequency band and the first frequency band such as the baseband band, and performs delay adjustment according to the line delay. Since DSRC uses a 5.8 GHz band or the like as a radio frequency, the base station is normally connected from the roadside antenna to the communication control device by an optical cable. This is because a loss is very large when a high-frequency radio signal is transmitted through an electric cable.

  On the other hand, as described above, in the wireless device 1 according to the present embodiment, an electrical cable can be used as the communication line 3 with the communication control device 2, so that it is possible to construct a wireless base station system with reduced costs. it can. In addition, since it is possible to receive from a plurality of wireless devices by adjusting the timing in the wireless device 1, a plurality of wireless devices are provided in the transmittable range to expand a receivable area from the in-vehicle device. It is possible to set a high communication area.

  In particular, in the case of the DSRC method, since communication is performed by switching in a time division manner on both the base station side and the vehicle-mounted side in the same slot, it is necessary to switch between the communication at a very high speed. That is, since the allowable delay amount is small, if the communication control device receives a signal from each wireless device and adjusts the timing for each signal each time, a very high-speed arithmetic processing device is required. End up. Therefore, each wireless device has a timing adjustment function, so that the communication control device can be realized with a processing capability equivalent to that of a normal case, and a wireless base station system with reduced costs can be realized.

  According to such an embodiment of the present invention, an inexpensive system using an electrical cable as a communication line can be realized by using a wireless device that performs frequency conversion and timing adjustment, and a plurality of transmission areas can be provided within a transmission possible area. It is possible to set a communication area with a high degree of freedom, such as installing the wireless devices so that the receivable areas overlap. And since the reception quality of the signal received from the some radio | wireless apparatus is determined and selected, a communication area can be expanded and stable communication can be performed.

  The radio base station system of the present invention has the effect of expanding the communication area and enabling stable communication, and is useful for road-to-vehicle communication systems using the DSRC method.

Explanatory drawing which shows the outline of the radio base station system which concerns on embodiment of this invention The block diagram which shows schematic structure of the communication control apparatus which concerns on embodiment of this invention. The block diagram which shows schematic structure of the line | wire selection part which concerns on embodiment of this invention. The block diagram which shows schematic structure of the radio | wireless apparatus which concerns on embodiment of this invention Explanatory drawing which shows the timing adjustment which concerns on embodiment of this invention Explanatory drawing which shows the outline of the delay amount measuring method which concerns on embodiment of this invention. FIG. 5 is a sequence diagram showing a procedure for setting a delay adjustment amount according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1d Wireless apparatus 2 Communication control apparatus 3, 3a, 3b, 3c, 3d Communication line 4a, 4b, 4c, 4d Reception area 4t Transmission area 5 Vehicle 6 In-vehicle apparatus 11 Timing adjustment part 12 Antenna 13 Wireless processing unit 14 Control unit 21 Line selection unit 22 Timing generation unit 23 Communication processing unit 24 Line delay measurement unit 25a, 25b, 25c, 25d Reception quality determination unit 26 Selection unit

Claims (11)

A communication control device connected via a wired communication line to each of a plurality of antenna devices that perform wireless communication with an in-vehicle device,
Reception quality determination means for determining the reception quality of the signal received for each of the connected wired communication lines;
Selection means for selecting a communication line for receiving the signal based on the reception quality determined by the reception quality determination means;
A communication control device comprising: The communication control device according to claim 1,
The reception control unit is a communication control device that performs error determination for each slot of the received signal, and the selection unit selects a communication line with few errors for each slot. The communication control device according to claim 1,
The reception control unit is configured to measure the reception field strength of the reception signal for each slot, and the selection unit selects a communication line having a strong reception field strength for each slot. The communication control device according to any one of claims 1 to 3,
The selection means is a communication control device for selecting a communication line on which a synchronization signal is normally received. The communication control device according to any one of claims 1 to 4,
The selection means is a communication control device that selects the connected communication lines according to priority. A wireless base station system including a plurality of antenna devices that perform wireless communication with an in-vehicle device, and a communication control device connected to each of the antenna devices via a wired communication line,
The antenna device is configured between a wireless communication unit that converts a radio signal received from the in-vehicle device into a signal in a first frequency band that is a frequency band lower than a radio frequency band, and the received communication control device. Timing adjustment means for delaying the signal subjected to frequency conversion and outputting it to the wired communication line with a delay adjustment amount set according to the line delay amount of the wired communication line that occurs,
The said communication control apparatus is a radio base station system which has each means as described in any one of Claim 1 thru | or 5. The radio base station system according to claim 6,
Each of the plurality of antenna devices is a radio base station system in which a reception area capable of receiving a signal from the in-vehicle device is installed at a position where it overlaps with a reception area of another antenna device. The radio base station system according to claim 6 or 7,
One of the plurality of antenna devices is a radio base station system further comprising transmission means for transmitting a signal from the communication control device. A radio base station system according to any one of claims 6 to 8,
The communication control device transmits a control signal to the antenna device via the wired communication line, and measures a line delay measuring means for measuring a line delay amount until a response from the antenna device, and the measured A radio base station system further comprising: a delay adjustment amount setting unit configured to set and transmit a delay adjustment amount to the antenna device based on a line delay amount. A communication control device communication method connected to each of a plurality of antenna devices that perform wireless communication with an in-vehicle device via a wired communication line,
Determining the reception quality of the signal received for each of the connected wired communication lines;
Selecting a communication line for receiving the signal based on the reception quality determined by the reception quality determination means;
A communication method. A communication method of a radio base station system including a plurality of antenna devices that perform radio communication with an in-vehicle device, and a communication control device that is connected to each of the antenna devices via a wired communication line,
Radio converting the radio signal received from the in-vehicle device to a first frequency band that is a frequency band lower than the radio frequency band; and
Delaying the frequency-converted received signal from the in-vehicle device by a delay adjustment amount set according to a line delay amount of the wired communication line generated between the communication control device;
Transmitting the delayed signal to the communication control device via the wired communication line;
Determining the reception quality of the signal received for each of the connected plurality of wired communication lines;
Selecting a communication line for receiving the signal based on the reception quality determined by the reception quality determination means;
A communication method.

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