JP2006270573A - Antenna apparatus and communication control apparatus of wireless base station system, and communication method and communication control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna apparatus and a communication control apparatus of a wireless base station system wherein the cost is suppressed and a communication area can be set with a high degree of freedom, and to provide a communication method and a communication control method. <P>SOLUTION: Wireless apparatuses 1a, 1b making communication with on-vehicle apparatuses 6a, 6b are connected to a communication control apparatus 2 via communication lines 3a, 3b, respectively. Signals transmitted through the communication lines 3a, 3b are baseband signals and the wireless apparatuses 1a, 1b convert the baseband signals into wireless signals. The wireless apparatuses 1a, 1b use timing adjustment sections 11a, 11b to delay a downlink signal from the communication control apparatus 2 and uplink signals from the on-vehicle apparatuses 6a, 6b by a delay adjustment amount set according to delays of the communication lines 3a, 3b and provide the output of the result. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio base station system including an antenna device that performs radio communication with an in-vehicle device, and a communication control device that is connected to the antenna device via a wired communication line, and a communication method and a communication control method thereof.

  In a road-to-vehicle communication system that performs communication between a roadside device and an in-vehicle device mounted on a vehicle traveling on a road, a plurality of continuously arranged roadside antennas and a radio signal radiated and output by the roadside antenna are output. There has been a road-vehicle communication system having one wireless device that receives and processes a wireless signal obtained by capturing one or more of roadside antennas.

The plurality of roadside antennas and the wireless device are connected by an optical cable. The reason is that the 5.8 GHz band or the like is used as a radio frequency, so that a high frequency radio signal is transmitted through an electric cable, so that the loss becomes very large. There are two points, that is, the difference in propagation time due to the difference in length is larger (see, for example, Patent Document 1).
JP 2001-244872 A

  However, since the optical fiber is more expensive than the electrical cable, there is a situation in which the cost for constructing the system increases. However, if a relatively inexpensive electrical cable is used, the signal loss will increase, so it will be necessary to increase the output on the wireless device side, or there will be a difference in the propagation time for each cable. That is, there is a situation that the degree of freedom of the position of the communicable area is lowered.

  The present invention has been made in view of the above-described conventional circumstances, and is an antenna device, a communication control device, a communication method, and a communication in a radio base station system that can control a cost and can set a communication region with a high degree of freedom. An object is to provide a control method.

  The antenna device of the present invention is an antenna device of a wireless base station system including an antenna device that performs wireless communication with an in-vehicle device, and a communication control device that is connected to the antenna device via a wired communication line. Wired communication means connected to a communication line and communicating with the communication control device using a signal in a first frequency band that is a frequency band lower than a radio frequency band, and the signal in the first frequency band and the radio frequency band A delay adjustment amount set according to a line delay amount of the wired communication line generated between the communication control device and a wireless communication means for performing a frequency conversion between the signal and a wireless communication means for performing wireless communication with the in-vehicle device And a timing adjusting means for delaying transmission between the wired communication means and the wireless processing means.

  With this configuration, the antenna device 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. It is possible to construct a radio base station system that can use a standard cable, reduce costs, and set a communication area with a high degree of freedom.

  In the antenna device of the present invention, the timing adjustment unit delays the signal of the first frequency band received from the communication control device by the delay adjustment amount and outputs the delayed signal to the wireless communication unit. The communication means transmits a radio signal obtained by frequency-converting the output signal from the timing adjustment means into a radio frequency band.

  With this configuration, delay adjustment can be performed in downlink communication transmitted from the communication control apparatus.

  Further, in the antenna device of the present invention, the wireless communication unit converts the radio signal received from the in-vehicle device into the first frequency band and outputs the frequency signal to the timing adjusting unit, and the timing adjusting unit includes: The frequency-converted received signal from the in-vehicle device is delayed by the delay adjustment amount and transmitted to the communication control device.

  With this configuration, it is possible to perform delay adjustment in uplink communication transmitted from the in-vehicle device.

  In the antenna device of the present invention, the delay adjustment amount is set such that the sum of the line delay amount of the wired communication circuit and the delay adjustment amount is a constant amount.

  With this configuration, it is possible to make the time required for communication between the communication control device and the antenna device constant, and even when a plurality of antenna devices are connected to the communication control device, each antenna and the communication control device. Variation in line delay occurring between the two can be eliminated.

  The communication control apparatus of the present invention is a communication control apparatus of a radio base station system including an antenna apparatus that performs radio communication with an in-vehicle apparatus, and a communication control apparatus that is connected to the antenna apparatus via a wired communication line. A wired communication means connected to the wired communication line and communicating with the antenna device using a signal in a first frequency band that is a frequency band lower than a radio frequency band; and A line delay measuring means for transmitting a control signal via the line and measuring a line delay amount until a response from the antenna device, and a delay adjustment amount for the antenna device is set based on the measured line delay amount And delay adjustment amount setting means for transmitting to the antenna device via the wired communication means.

  With this configuration, communication with the antenna device is performed using the signal of the first frequency band such as the baseband, and the delay adjustment amount in the antenna device is set by measuring the line delay with the antenna device. Therefore, an electric cable can be used as a communication line between the communication control device and the antenna device, and it is possible to construct a radio base station system capable of reducing costs and setting a highly flexible communication area. it can.

  In the communication control device of the present invention, the wired communication means is connected to a plurality of antenna devices via different wired communication lines, and the line delay measuring means and the delay adjustment amount setting means are provided for each antenna device. Next, the line delay amount is measured and the delay adjustment amount is set.

  With this configuration, the delay adjustment amount can be set for each of the plurality of antenna devices.

  Further, in the communication control apparatus of the present invention, the delay adjustment amount setting means is configured so that a sum of the line delay amount and the delay adjustment amount of each of the antenna devices is a line delay amount measured by the plurality of antenna devices. The delay adjustment amount for each antenna device is set to be equal to the largest line delay amount.

  With this configuration, it is possible to eliminate variations in line delay that occur between each antenna device and the communication control device. Further, it is possible to suppress a delay amount of communication between the communication control device and the in-vehicle device.

  Further, in the communication control apparatus of the present invention, the delay adjustment amount setting means sets the delay adjustment amount so that a sum of the measured line delay amount of the wired communication circuit and the delay adjustment amount becomes a constant amount. Set.

  With this configuration, it is possible to make the time required for communication between the communication control device and the antenna device constant, and when a plurality of antenna devices are connected, this occurs between each antenna device and the communication control device. It is possible to eliminate variations in line delay.

  The radio base station system of the present invention is a radio base station system including an antenna device that performs radio communication with an in-vehicle device, and a communication control device that is connected to the antenna device via a wired communication line. Is connected to the wired communication line and communicates with the communication control device using a signal of a first frequency band that is a frequency band lower than a radio frequency band, and an antenna wired communication means for communicating with the first frequency band. Frequency conversion between a signal and a signal in a radio frequency band is performed according to a line delay amount of the wired communication line generated between the wireless communication unit that performs wireless communication with the in-vehicle device and the communication control device And a timing adjustment unit that delays transmission between the antenna wired communication unit and the wireless processing unit by a delay adjustment amount, and the communication control device includes the wired communication circuit. A communication control wired communication means connected to the antenna device using a signal in the first frequency band, and a control signal is transmitted to the antenna device via the wired communication line, and the antenna A line delay measuring unit that measures a line delay amount until a response from the device, and a delay adjustment amount for the antenna device is set based on the measured line delay amount, and the communication control wired communication unit is used to set the delay adjustment amount. Delay adjustment amount setting means for transmitting to the antenna device.

  With this configuration, the antenna device performs frequency conversion from a radio signal to a signal in the first frequency band such as the baseband, and performs delay adjustment according to the line delay set by the communication control device. An electric cable can be used as a communication line, a cost can be reduced, and a radio base station system capable of setting a highly flexible communication area can be constructed.

  A communication method of the present invention is a communication method for an antenna device of a wireless base station system, which includes an antenna device that performs wireless communication with an in-vehicle device, and a communication control device that is connected to the antenna device via a wired communication line. Receiving a signal in a first frequency band, which is a frequency band lower than a radio frequency band, transmitted from the communication control device via the wired communication line; and receiving the signal in the received first frequency band. , Delaying by a delay adjustment amount set in accordance with a line delay amount of the wired communication line generated between the communication control device and the signal of the delayed first frequency band to a radio frequency band Converting the frequency and transmitting a radio signal in the radio frequency band.

  By this method, in the antenna device, the downstream signal from the communication control device is frequency-converted from the first frequency band such as the baseband to the radio frequency band, and the delay according to the line delay generated between the communication control device Since the adjustment is performed, an electric cable can be used as a communication line with the communication control device, and a radio base station system capable of setting a communication area with a high degree of freedom can be constructed with reduced costs.

  A communication method of the present invention is a communication method for an antenna device of a wireless base station system, which includes an antenna device that performs wireless communication with an in-vehicle device, and a communication control device that is connected to the antenna device 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 And having.

  By this method, in the antenna device, the upstream signal from the in-vehicle device is frequency-converted from the radio frequency band to the first frequency band such as the baseband band, and the delay adjustment according to the line delay generated between the communication control device Therefore, an electric cable can be used as a communication line with the communication control apparatus, and a radio base station system capable of setting a communication area with a high degree of freedom can be constructed with reduced costs.

  The communication control method of the present invention is a communication control method of a radio base station system including an antenna device that performs radio communication with an in-vehicle device, and a communication control device that is connected to the antenna device via a wired communication line. Communicating with the antenna device using a signal in a first frequency band that is a frequency band lower than a radio frequency band; and a frequency band lower than a radio frequency band via the wired communication line to the antenna apparatus. Transmitting a control signal in the first frequency band, and measuring a time until a response from the antenna device as a line delay amount, and based on the measured line delay amount, the antenna device Setting a delay adjustment amount and transmitting the delay adjustment amount to the antenna device via the wired communication means.

  With this method, in the communication control device, communication with the antenna device between the antenna device and the antenna device is performed using a signal in the first frequency band such as the baseband, and the line delay with the antenna device is reduced. Measuring and setting the delay adjustment amount in the antenna device, an electric cable can be used as a communication line between the communication control device and the antenna device, and the communication area can be set with low cost and high flexibility. A possible radio base station system can be constructed.

  According to the present invention, it is possible to provide an antenna device, a communication control device, a communication method, and a communication control method of a radio base station system that can reduce the cost and set a communication area with a high degree of freedom.

  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 according to the present embodiment includes radio devices 1a and 1b that perform radio communication with in-vehicle devices, and communications that are connected to the radio devices 1a and 1b via communication lines 3a and 3b, respectively. And a control device 2. The communication lines 3a and 3b 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 two, and one or more arbitrary numbers can be connected. In this system, the wireless devices 1a and 1b operate as antenna devices.

  The wireless device 1a can communicate with the in-vehicle device 6a installed in the vehicle 5a existing in the communication area 4a, and the wireless device 1b can communicate with the in-vehicle device 6b installed in the vehicle 5b present in the communication area 4b. is there. 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 to the communication control device 2 is referred to as “uplink communication”.

  The communication control device 2 is an example of a wired communication unit, a line connection unit 21 connected to the communication lines 3a and 3b, a timing generation unit 22 that generates timing for performing communication based on the frame timing of DSRC, A communication processing unit 23 which is an example of a delay adjustment amount setting unit and a line delay measurement unit 24 which is an example of a line delay measurement unit and measures line delays of the communication lines 3a and 3b.

  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 devices 6a and 6b 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.

  Next, the configuration of the wireless devices 1a and 1b will be described with reference to FIG. FIG. 2 is a block diagram showing a schematic configuration of the radio apparatus according to the embodiment of the present invention. As illustrated in FIG. 2, the wireless device 1 includes a timing adjustment unit 11, an antenna 12, a wireless processing unit 15, and a control unit 16. Note that the wireless devices 1a and 1b shown in FIG. 1 have the same configuration as the wireless device 1 shown in FIG. 2, and the timing adjustment units 11, 11a and 11b and the antennas 12, 12a and 12b are the same. It has the function of.

  The timing adjustment unit 11 is an example of a wired communication unit and a timing adjustment unit, and a downlink delay adjustment unit 13 that delays a downlink signal received from the communication control device 2 via the communication line 3 by a predetermined delay adjustment amount; And an uplink delay adjustment unit 14 that delays an uplink signal from the apparatus by a predetermined delay adjustment amount and transmits the delayed signal to the communication control apparatus 2 via the communication line 3.

  The wireless processing unit 15 is an example of a wireless communication unit, converts the baseband signal from the downlink delay adjustment unit 13 to a wireless frequency band, and transmits the signal via the antenna 12. In addition, the radio signal received from the in-vehicle device 6 via the antenna 12 is converted into a baseband signal and output to the uplink delay adjusting unit 14. The control unit 16 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. 3A and 3B are explanatory diagrams illustrating timing adjustment according to the embodiment of the present invention. FIG. 3A illustrates timing adjustment during downlink communication, and FIG. 3B illustrates timing adjustment during uplink communication.

As shown in FIG. 3A, first, a downlink communication signal output from the communication control device 2 and transmitted to the wireless device 1a via the communication line _3a is accompanied by a line delay d _3a in the communication line 3a. It is input to the timing adjustment unit 11a of the wireless device 1a. Then, the downlink delay adjusting unit 13 of the timing adjusting portion 11a, a downlink communication signal inputted, is delayed by the delay adjustment amount AD _a.

Further, the downlink communication signal output from the communication control device 2 and transmitted to the wireless device 1b via the communication line 3b is input to the timing adjustment unit 11b of the wireless device 1b with the line delay d _3b in the communication line 3b. Is done. Then, the downlink delay adjusting unit 13 of the timing adjusting portion 11b, a downlink communication signal inputted, is delayed by the delay adjustment amount AD _b.

In any of the timing adjustment units 11a and 11b, the downlink communication signal delayed by the downlink delay adjustment unit 13 is delayed by the processing delay D _11d generated by the downlink delay adjustment unit 13, and output from the timing adjustment unit 11b. Is done. The downlink communication signal output from the timing adjustment unit 11b is transmitted from the antenna 12a after being delayed by a processing delay _D12d until reaching the antenna 12b via the wireless processing unit 15.

Here, the transmission system processing of the radio apparatus 1 is the sum of the downlink signal processing delay D _11d in the timing adjustment unit 11 and the delay D _12d from the output from the timing adjustment unit 11 to the output of the antenna 12 The delay TX _d (= D _11d + D _12d ) is substantially the same time for all the wireless devices 1.

Therefore, the part of the time required for the downlink signal output from the communication control apparatus 2 to be output by the antenna 12 differs for each wireless apparatus is line delays d _3a and d _3b . Thus, in the present embodiment, as shown in FIG. _3A , the delay adjustment amounts AD _a and AD _b in the downlink delay adjustment unit 13 of each wireless device 1 are the sum of the line delay and the delay adjustment amount. The amount τ _d is set, that is, d _3a + AD _a = d _3b + AD _b = τ _d is set. Therefore, the shorter the distance of the communication line, the larger the delay adjustment amount to be inserted. Conversely, the longer the distance, the smaller the delay adjustment amount to be inserted. When the line delay is the maximum allowable delay, the delay adjustment amount to be inserted is “0”.

  In this way, the downlink signal output from the communication control device 2 is simultaneously transmitted from the antennas 12a and 12b that form different communication areas. That is, the influence of the line delay caused by the communication lines 3a and 3b can be eliminated.

As for the uplink communication, as shown in FIG. 3B, the uplink communication signal transmitted from the in-vehicle device 6a and input to the antenna 12a of the wireless device 1a is sent to the uplink delay adjusting unit 14 via the wireless processing unit 15. _Is delayed by the processing delay D _12u until the signal is input to the timing adjustment 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 uplink delay adjustment unit 14.

The uplink delay adjusting unit 14, the input uplink communication signals, delayed by the delay adjustment amount AD _a. Uplink communication signal output from the timing adjusting portion 11a, with a line delay d _3a in communication lines 3a, it is inputted to the communication control device 2.

Further, the downlink communication signal transmitted from the in-vehicle device 6b and input to the antenna 12b of the wireless device 1b is delayed by the processing delay D _12u until reaching the upstream delay adjusting unit 14 via the wireless processing unit 15, and the timing Input to the adjustment 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 uplink delay adjustment unit 14.

The uplink delay adjusting unit 14, the input uplink communication signals, delayed by the delay adjustment amount AD _b. Uplink communication signal output from the timing adjusting portion 11b, with a line delay d _3b in the communication line 3b, it is inputted to the communication control device 2.

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 . Thus, in the present embodiment, as shown in FIG. 3B, the delay adjustment amounts AD _a and AD _b in the downlink delay adjustment unit 13 of each wireless device 1 are the sum of the line delay and the delay adjustment amount. The quantity τ _u is set, that is, d _3a + AD _a = d _3b + AD _b = τ _u is set. In an actual transmission line, it is assumed that upstream and downstream are the same distance, and τ _d = τ _u = 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.

  FIG. 4 is a diagram showing a configuration example of a radio frame used in the radio communication system according to the embodiment of the present invention. As shown in FIG. 4, the communication frame used in communication between the base station and the in-vehicle device is an FCMS that is a slot used for transmitting frame control information and the like from the base station to the in-vehicle device, MDS, which is a slot used for data transmission / reception between the base station and the in-vehicle device, WCNS, which is a slot used to identify the type of the in-vehicle device, and the in-vehicle device communicate with the base station device There are four types of slots with the ACTS used to send the registration request.

  Here, since the time between the communication control device 2 and the antenna 12 when a plurality of wireless devices 1 are connected is the same and the timing is correct, for example, the communication control device 2 is shown in FIG. MDS (1) to be assigned as a slot for communicating with the vehicle 5a existing in the communication area 4a, and MDS (2) assigned as a slot for communicating with the vehicle 5b existing in the communication area 4b. it can.

  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. 5 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 shown in FIG. 5, 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. 6 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.

  According to such an embodiment of the present invention, the radio device 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. An electric cable can be used as a communication line with the control device, and a radio base station system capable of setting a communication area with a high degree of freedom can be constructed with reduced costs.

  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.

  The radio base station system of the present invention has the effect of reducing the cost and setting a communication area with a high degree of freedom, and is useful for a road-to-vehicle communication system 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 radio | wireless apparatus which concerns on embodiment of this invention Explanatory drawing which shows the timing adjustment which concerns on embodiment of this invention The figure which shows the structural example of the radio | wireless frame used with the radio | wireless communications system of 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

1, 1a, 1b Wireless device 2 Communication control device 3, 3a, 3b Communication line 4a, 4b Communication area 5a, 5b Vehicle 6a, 6b In-vehicle device 11, 11a, 11b Timing adjustment unit 12, 12a, 12b Antenna 13 Down delay adjustment Unit 14 uplink delay adjustment unit 15 radio processing unit 16 control unit 21 line connection unit 22 timing generation unit 23 communication processing unit 24 line delay measurement unit

Claims (12)

A wireless base station system communication control device including an antenna device that performs wireless communication with an in-vehicle device, and a communication control device connected to the antenna device via a wired communication line,
Wired communication means connected to the wired communication line and communicating with the communication control device using a signal in a first frequency band that is a frequency band lower than a radio frequency band;
Radio communication means for performing frequency conversion between the signal of the first frequency band and the signal of the radio frequency band, and performing radio communication with the in-vehicle device,
Timing adjustment means for delaying transmission between the wired communication means and the wireless processing means by a delay adjustment amount set according to a line delay amount of the wired communication line generated between the communication control device and the communication control device; ,
An antenna device comprising: The antenna device according to claim 1,
The timing adjustment unit delays the signal of the first frequency band received from the communication control device by the delay adjustment amount and outputs the delayed signal to the wireless communication unit.
The wireless communication unit is an antenna device that transmits a radio signal obtained by frequency-converting an output signal from the timing adjustment unit into a radio frequency band. The antenna device according to claim 1,
The wireless communication means frequency-converts the wireless signal received from the in-vehicle device to the first frequency band, and outputs to the timing adjustment means,
The said timing adjustment means is an antenna apparatus which delays the received signal from the said vehicle-mounted apparatus by which the said frequency conversion was carried out with the said delay adjustment amount to the said communication control apparatus. The antenna device according to any one of claims 1 to 3,
The delay adjustment amount is an antenna device set so that a sum of a line delay amount of the wired communication circuit and the delay adjustment amount is a constant amount. A wireless base station system communication control device including an antenna device that performs wireless communication with an in-vehicle device, and a communication control device connected to the antenna device via a wired communication line,
Wired communication means connected to the wired communication line and communicating with the antenna device using a signal in a first frequency band that is a frequency band lower than a radio frequency band;
A line delay measuring means for transmitting a control signal to the antenna device via the wired communication line and measuring a line delay amount until a response from the antenna device;
A delay adjustment amount setting means for setting a delay adjustment amount for the antenna device based on the measured line delay amount and transmitting the delay adjustment amount to the antenna device via the wired communication means;
A communication control device comprising: The communication control device according to claim 5,
The wired communication means is connected to a plurality of antenna devices via different wired communication lines,
The line delay measuring unit and the delay adjustment amount setting unit are communication control devices that measure a line delay amount and set a delay adjustment amount for each antenna device. The communication control device according to claim 6,
In the delay adjustment amount setting means, the sum of the line delay amount and the delay adjustment amount in each of the antenna devices is equal to the largest line delay amount among the line delay amounts measured by the plurality of antenna devices. Thus, the communication control apparatus which sets the delay adjustment amount for every said antenna apparatus. The communication control device according to claim 5 or 6,
The delay adjustment amount setting means is a communication control device that sets the delay adjustment amount so that a sum of the measured line delay amount of the wired communication circuit and the delay adjustment amount becomes a constant amount. A wireless base station system including an antenna device that performs wireless communication with an in-vehicle device, and a communication control device connected to the antenna device via a wired communication line,
The antenna device is connected to the wired communication line and communicates with the communication control device using a signal in a first frequency band that is a frequency band lower than a radio frequency band; and Frequency conversion between a signal in a frequency band and a signal in a radio frequency band is performed, and a line delay amount of the wired communication line generated between the wireless communication unit that performs wireless communication with the in-vehicle device and the communication control device Timing adjustment means for delaying transmission between the antenna wired communication means and the wireless processing means with a delay adjustment amount set accordingly,
The communication control device is connected to the wired communication line and communicates with the antenna device using a signal in the first frequency band, and the wired communication line is connected to the antenna device. A control signal is transmitted via the line delay measuring means for measuring a line delay amount until the response from the antenna device, and based on the measured line delay amount, a delay adjustment amount for the antenna device is set, A wireless base station system comprising: delay adjustment amount setting means for transmitting to the antenna device via the communication control wired communication means. A communication method for an antenna device of a wireless base station system, comprising: an antenna device that performs wireless communication with an in-vehicle device; and a communication control device connected to the antenna device via a wired communication line,
Receiving a signal in a first frequency band, which is a frequency band lower than a radio frequency band, transmitted from the communication control device via the wired communication line;
Delaying the received signal of the first frequency band by a delay adjustment amount set according to a line delay amount of the wired communication line generated between the communication control device;
Frequency-converting the delayed first frequency band signal to a radio frequency band, and transmitting the radio frequency band radio signal;
A communication method. A communication method for an antenna device of a wireless base station system, comprising: an antenna device that performs wireless communication with an in-vehicle device; and a communication control device connected to the antenna device via a wired communication line,
A step of frequency-converting a radio signal received from the in-vehicle device to a first frequency band that is a frequency band lower than a radio frequency band;
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;
A communication method. A communication control method for a radio base station system, comprising: an antenna device that performs radio communication with an in-vehicle device; and a communication control device that is connected to the antenna device via a wired communication line.
Communicating with the antenna device using a signal in a first frequency band that is a lower frequency band than a radio frequency band;
A control signal of a first frequency band that is a frequency band lower than a radio frequency band is transmitted to the antenna apparatus via the wired communication line, and a time until a response from the antenna apparatus is defined as a line delay amount. Measuring step;
Setting a delay adjustment amount for the antenna device based on the measured line delay amount, and transmitting to the antenna device via the wired communication means;
A communication control method.

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