JP2017212525A - LCX relay system and LCX relay network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LCX relay system capable of saving power, while improving quality of communication line.SOLUTION: An LCX relay system includes a base station, multiple repeaters, a leakage coaxial cable (LCX) for connecting the base station and multiple repeaters in series, a positional information data server moving along the LCX, and capable of storing the positional information of a mobile station communicable with a base station via the LCX and repeater, and a supervisory control section for controlling the base station by connecting with the positional information data server and base station, or controlling the repeater by connecting with the positional information data server and repeater. The supervisory control section controls ON/OFF of communication between the repeater and base station, based on the positional information of a repeating area where the repeater relays communication between a mobile station and base station via the LCX, and the positional information of a mobile station stored in the positional information data server.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a leaky coaxial cable (LCX) relay system, and in particular, in an optical ROF (Radio On Fiber) type mobile station wireless LCX relay system, a relay station, a base station, and a base station correspond to the position of the mobile station. The present invention relates to a technology for controlling on / off of communication.

  In a conventional optical ROF LCX relay system used for train radio, etc., a leaky coaxial cable (LCX) is installed along the line along which the mobile station travels, and wireless communication between the base station and the mobile station via radio waves leaking from the LCX (For example, refer to Patent Document 1). Since the signal passing through the LCX is attenuated in proportion to the transmission distance, it is amplified by the repeater.

  In a train radio LCX relay system using an optical ROF system, there is an optical conversion device that converts a high-frequency signal into an optical signal at a base station, and the optical signal is transmitted from the base station to a repeater. The repeater that has received the optical signal performs optical ROF conversion of the optical signal into a high-frequency signal. The high frequency signal gradually leaks from the LCX while propagating through the LCX. That is, a radio signal based on the signal transmitted from the base station is output from the LCX. In communication from the mobile station to the base station, the mobile station transmits a radio signal toward the LCX, propagates inside the LCX as a high-frequency signal, and inputs it to the repeater. The high frequency signal is converted into an optical signal by a repeater and then transmitted to the base station. The base station converts the optical signal transmitted from each repeater into a high-frequency signal, and then synthesizes each signal (see, for example, Patent Document 2).

JP-A-9-130322 JP 2004-236165 A

  In the above-described optical ROF train radio LCX relay system, all the repeaters installed along the line are always in the ON state, and even in areas where the mobile station is not present, the repeaters are connected via the LCX. It outputs radio signals and continues to consume power. That is, the conventional train radio LCX relay system cannot realize power saving.

  In addition, when a radio signal is transmitted from a mobile station to a base station, the LCX relay system also synthesizes signals from areas in the relay station where the mobile station is not present from each relay station along the line. And the signal-to-noise ratio is reduced, which hinders the improvement of the line quality.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an LCX relay system capable of saving power and improving the quality of a communication line.

  The LCX relay system according to the present invention moves along the LCX, the leaky coaxial cable (LCX) that connects the base station, the plurality of relays, the base station and the plurality of relays in series, and the LCX and the relay A location information data server that can store location information of a mobile station that can communicate with the base station via a machine, and the location information data server and the base station are connected to control the base station, or the location information data server and the relay A monitoring control unit that connects to the mobile station and controls the relay station, the monitoring control unit includes position information of a relay area in which the relay relays communication between the mobile station and the base station via the LCX, and a position Based on the position information of the mobile station stored in the information data server, the communication between the repeater and the base station is controlled.

  According to the LCX relay system of the present invention, it is possible to provide an LCX relay system that can save power and improve the quality of a communication line.

1 is a diagram showing a configuration of an LCX relay system in Embodiment 1. FIG. 1 is a diagram showing a configuration of an LCX relay system in Embodiment 1. FIG. 2 is a diagram illustrating a configuration of a base station in Embodiment 1. FIG. 3 is a diagram illustrating a configuration of a repeater in the first embodiment. FIG. 6 is a diagram illustrating a configuration of an LCX relay system according to Embodiment 2. FIG. It is a figure which shows the structure of the relay machine in Embodiment 2. FIG. FIG. 10 is a diagram illustrating a configuration of an LCX relay network in a third embodiment. FIG. 10 is a diagram showing a configuration of a terminal rack in a third embodiment.

  Embodiments of an LCX relay system and an LCX relay network according to the present invention will be described.

<Embodiment 1>
(Overall configuration of LCX relay system)
FIG. 1 is a diagram showing an overall configuration of an LCX relay system 100 according to Embodiment 1 of the present invention. FIG. 2 shows an extracted configuration of the LCX relay system 100 on the base station 10 side. Hereinafter, the configuration of the LCX relay system 100 will be described with reference to FIGS. 1 and 2.

  The LCX relay system 100 includes a base station 10, relay units 20a to 20n, and LCX (leaky coaxial cables) 30a to LCX 30n that connect the base station 10 and each relay in series. The LCX 30a connects the base station 10 and the repeater 20a, and the LCX 30b connects the repeater 20a and the repeater 20b. The LCX 30c connects the repeater 20b and the repeater 20c. In FIG. 1, illustration of a relay device provided between the LCX 30d connected to the relay device 20c and the LCX 30n connected to the relay device 20n is omitted, but these relay devices are the same as the relay device 20a shown in FIG. The same configuration is included, and each repeater is connected by each LCX similarly to the above repeater.

  The base station 10 and the repeater 20a are connected by an optical fiber cable 50a for communication signal transmission and an optical fiber cable 60 for control signal transmission. Similarly, the base station 10 and the repeater 20b are connected by two types of optical fiber cables 50b and an optical fiber cable 60. Although not shown, each relay unit provided between the relay unit 20c to the relay unit 20n and the base station 10 are similarly connected by two types of optical fiber cables. As described above, the LCX relay system 100 has a single-row configuration with each of the plurality of relays connected to the base station 10 and each LCX. A track 90 is arranged along the LCX relay system 100, and a mobile station 91a capable of wireless communication with the base station 10 via each LCX and each relay is located on the track 90 so as to be movable. The mobile station 91a is a train, for example, and the track 90 is a track, for example.

  The LCX relay system 100 includes a position information data server 40 that can store the position information of the mobile station 91a. In the first embodiment, the location information data server 40 is connected to the base station 10 by a cable 70 and a cable 80. The location information data server 40 stores location information of a plurality of mobile stations that can communicate with the LCX relay system 100. For example, the position information of a plurality of trains existing on a track arranged along the LCX relay system 100 is collected.

  The base station 10 and each relay station include each relay area that relays communication between the mobile station and the base station 10 via each LCX. The relay area is an area where the repeater can wirelessly relay with the mobile station via LCX. For example, FIGS. 1 and 2 illustrate a relay area according to the first embodiment. The base station 10 includes a relay area 31a, and the repeater 20a includes a relay area 31b. Further, the relay machine 20b includes a relay area 31c. In the first embodiment, each relay area is divided for each relay station, and the mobile station 91a and each relay station are wirelessly connected via the base station 10 or each LCX connected to the right side of each relay station. This is a communicable area. Note that the relay areas illustrated in FIGS. 1 and 2 are examples, and the relay areas may overlap each other at their boundaries.

  The LCX relay system 100 further includes a monitoring control unit. The monitoring control unit includes the first monitoring control device 15 included in the base station 10 shown in FIG. 3 and the repeater 20a shown in FIG. And a second monitoring control device 23a. FIG. 3 is a diagram showing the configuration of the base station 10, and details will be described later. 4 is a diagram showing the configuration of the repeater 20a. Although details will be described later, each repeater included in the LCX relay system 100 includes the same configuration as the repeater 20a shown in FIG. Each second monitoring control device is included.

  Although not shown, the monitoring control unit included in the LCX relay system 100 includes a processing circuit that realizes each control function of a first monitoring control device 15 and each second monitoring control device described later. The processing circuit includes a CPU (Central Processing Unit) and a memory connected to each other, and the processing circuit executes a program stored in the memory by the CPU. That is, each function and each operation of the first monitoring control device 15 and each second monitoring control device is described in a program, and the program is stored in a memory as software or firmware. When the CPU appropriately reads and executes the program, each function and each operation of the first monitoring control device 15 and the second monitoring control device described later are realized. The memory is, for example, a volatile or non-volatile semiconductor memory such as a RAM or a flash memory.

  Further, the processing circuit included in the monitoring control unit may be dedicated hardware. In this case, the processing circuit is, for example, a programmed processor. The monitoring control unit may realize each control by including a plurality of dedicated hardware corresponding to each function and each operation of the first monitoring control device 15 and each second monitoring control device, or one dedicated hardware Each control may be realized collectively by providing the wear. Further, a part of each function and operation of the first monitoring control device 15 and each second monitoring control device to be described later may be realized by dedicated hardware, and a part thereof may be realized by software or firmware.

(Base station configuration)
FIG. 3 is a diagram illustrating a configuration of the base station 10 included in the LCX relay system 100. The base station 10 includes an interface device 18 that distributes audio data and clocks to the transmission / reception device 11 and transmits the audio data received from the transmission / reception device 11 to a higher-level device than the base station. The base station 10 further includes a transmission / reception device 11 that processes a high-frequency signal, and the transmission / reception device 11 includes a distributor / combiner 12 that distributes or combines the high-frequency signals.

  The base station 10 further includes an optical conversion device 13, and the optical conversion device 13 includes a plurality of photoelectric conversion units that convert optical signals and high-frequency signals. In the first embodiment, the photoelectric conversion unit is an optical ROF conversion unit, and the optical conversion device 13 illustrated in FIG. 3 includes an optical ROF conversion unit 14a, an optical ROF conversion unit 14b, and an optical ROF conversion unit 14n. The optical conversion device 13 includes optical ROF conversion units corresponding to the number of repeaters corresponding to each service zone, and each optical ROF conversion unit is connected to each repeater on a one-to-one basis. In FIG. 3, although the illustration of the connecting repeater is omitted, the optical ROF converter 14a is connected to the repeater 20a via the optical fiber cable 50a, and the optical ROF converter 14b is connected to the optical fiber cable 50b. The optical ROF converter 14n is connected to the repeater 20n via the optical fiber cable 50n. Each optical ROF conversion unit converts a high-frequency signal into each optical signal and outputs it, and conversely converts each optical signal received from each repeater into each high-frequency signal. In addition, the high frequency signal which each optical ROF conversion part converts into an optical signal is an electrical signal, and a high frequency signal and an optical signal are communication signals.

  In addition, a signal that communicates between the base station 10 and each repeater has a delay depending on the distance. The base station 10 includes an optical delay correction device 16 that adjusts the timing of a signal and corrects the delay, and the optical delay correction device 16 is provided between each optical ROF conversion unit and each repeater. In addition, the base station 10 includes a power supply rack 17 for supplying power to each repeater via each LCX. The distributor / synthesizer 12 included in the transmission / reception device 11 of the base station 10 is connected to the position information data server 40 via a cable 80. The base station 10 demodulates the uplink signal including the position information of the mobile station 91a transmitted by the mobile station 91a shown in FIG. The location information of the mobile station 91 a is stored in the location information data server 40 via the cable 80.

  Further, the base station 10 includes a first monitoring control device 15 connected to the position information data server 40 via a cable 70, and the first monitoring control device 15 includes a second monitoring included in the repeater 20a shown in FIG. It is connected to the control device 23a by an optical fiber cable 60. The first monitoring control device 15 monitors and controls each device included in the base station 10, and determines whether the base station 10 or each repeater is based on the location information of the mobile station stored in the location information data server 40. Control.

(Configuration of repeater)
FIG. 4 is a diagram showing a detailed configuration of the repeater 20a. The other repeaters included in the LCX relay system 100 have the same configuration. The repeater 20a includes an optical ROF conversion unit 22a that bidirectionally converts an optical signal and a high-frequency signal, and the optical ROF conversion unit 22a is connected to the base station 10 via an optical fiber cable 50a.

  Further, the repeater 20a includes a high frequency amplification unit 21a, and the high frequency amplification unit 21a is connected to the optical ROF conversion unit 22a, the LCX 30a, and the LCX 30b. The high frequency amplification unit 21a amplifies the high frequency signal input from the optical ROF conversion unit 22a and outputs the amplified high frequency signal to the LCX 30b, and amplifies the high frequency signal input from the LCX 30a and LCX 30b and outputs the amplified high frequency signal to the optical ROF conversion unit 22a. That is, the high frequency amplifier 21a is connected to the base station 10 via the optical ROF converter 22a, amplifies a high frequency signal based on the optical signal input from the base station 10, and outputs the amplified signal to each LCX. The high frequency amplifier 21a amplifies the high frequency signal input from each LCX and outputs the amplified signal to the base station 10 via the optical ROF converter 22a.

  The repeater 20a includes a second monitoring control device 23a that monitors and controls the devices included in the repeater 20a. The second monitoring control device 23 a is connected to the first monitoring control device 15 of the base station 10 by the optical fiber cable 60. The second monitoring control device 23a is connected to the high frequency amplification unit 21a.

(Communication operation)
Downlink communication from the base station 10 to the mobile station is performed when a high-frequency signal based on a signal transmitted from the base station 10 is radiated from each LCX, and the mobile station receives the radiated high-frequency signal. On the other hand, uplink communication from the mobile station to the base station 10 is performed by the mobile station transmitting a high-frequency signal to each LCX, and transmitting the high-frequency signal to the base station via each LCX. In addition, the high frequency signal communicated between each LCX and the mobile station is a radio signal. Hereinafter, operations of the downlink communication and the uplink communication will be described.

  The operation of each device during downlink communication will be described. First, the transmitter / receiver 11 of the base station 10 shown in FIG. 3 generates a high-frequency signal to be transmitted to the mobile station. The distributor / synthesizer 12 included in the transmission / reception device 11 distributes the high-frequency signal for each subsequent device system connected to each repeater and outputs the signal to the optical conversion device 13. Here, for the sake of simplicity, the operation of each device in the system connected to the repeater 20a will be described, but the operation of each device in the system connected to another relay device is also the same. The optical ROF conversion unit 14a that is a photoelectric conversion unit included in the optical conversion device 13 converts a high-frequency signal into an optical signal. The optical delay correction device 16 performs delay adjustment on the converted optical signal according to the distance between the base station 10 and the repeater 20a. The delay-adjusted optical signal propagates through the optical fiber cable 50a and is input to the repeater 20a. The repeater 20a shown in FIG. 4 inputs the optical signal transmitted from the base station 10 to the optical ROF conversion unit 22a. The optical ROF converter 22a converts the optical signal into a high-frequency signal that is an electrical signal, and outputs the high-frequency signal to the high-frequency amplifier 21a. The high frequency amplifier 21a amplifies the high frequency signal and outputs it to the LCX 30b. The high-frequency signal leaks while propagating through the LCX 30b and is radiated to the space. As shown in FIG. 2, when the mobile station 91a is located in the relay area 31b where the LCX 30b is laid, the mobile station 91a receives a high-frequency signal and communication is completed.

  Note that the high-frequency signal radiated to the relay area 31 a where the LCX 30 a connected to the base station 10 is laid out is converted into an optical signal by the optical conversion device 13. Instead, it is transmitted directly to the LCX 30a via the power supply rack 17.

  Next, uplink communication will be described. In FIG. 2, the mobile station 91a transmits a high frequency signal. The high-frequency signal enters the LCX 30b corresponding to the relay area 31b where the mobile station 91a is located, propagates, and is input to the repeater 20a. The high frequency amplifier 21a of the repeater 20a shown in FIG. 4 amplifies the high frequency signal and outputs it to the optical ROF converter 22a. The optical ROF converter 22a converts a high frequency signal into an optical signal. The converted optical signal propagates through the optical fiber cable 50a and enters the base station 10. The optical delay correction device 16 of the base station 10 shown in FIG. 3 corrects the delay of the input optical signal and outputs it to the optical ROF conversion unit 14a. The optical ROF conversion unit 14 a converts the optical signal into a high frequency signal and outputs it to the distributor / combiner 12 of the transmission / reception device 11. The distributor / synthesizer 12 synthesizes high-frequency signals transmitted from the respective repeaters. These synthesized signals are received and processed to complete communication.

(Supervisory control based on mobile station location information)
In actual operation of a train radio system such as a Shinkansen, a plurality of trains are present on the track. FIG. 1 shows an example in which the mobile station 91a and the mobile station 91b are located on a trajectory 90 along the LCX relay system 100, as in such a situation.

  The mobile station 91a and the mobile station 91b periodically transmit the location information of each mobile station to the base station 10. When the mobile station 91a and the mobile station 91b are trains, the position information is called, for example, about kilometer. The position information individually transmitted from all mobile stations located on the track 90 is transmitted to the base station 10 via each LCX or each repeater. All the position information of these mobile stations is stored in the position information data server 40 connected to the base station 10. Note that the timing at which each mobile station transmits position information to the base station 10 may be a predetermined timing set in advance or may be always.

  The first monitoring control device 15 acquires the position information of each mobile station from the position information data server 40. Moreover, the 1st monitoring control apparatus 15 acquires the positional information on each relay area which each relay machine contains. The position information of each relay area is stored in advance in a memory of a processing circuit included in the monitoring control unit, for example. Note that the timing at which the first monitoring control device 15 acquires the position information of the mobile station may be a predetermined timing set in advance or may be always.

  The first monitoring control device 15 controls on / off of communication between each relay station and the base station 10 based on the position information of each relay area and the position information of each mobile station stored in the position information data server 40. To do. In the first embodiment, the first monitoring control device 15 controls the communication between the relay station that relays communication to the relay area where the mobile station is located and the base station 10, and the relay where the mobile station is not located. Communication between the base station 10 and at least a part of the relays included in the relay that relays communication to the area is controlled. For example, for the mobile station 91a shown in FIG. 1, the first monitoring control device 15 controls the communication between the relay station 20a and the base station 10 that relays communication to the relay area 31b where the mobile station 91a is located, and moves Communication between the base station 10 and at least some of the repeaters that relay communication to a relay area where the station 91a is not located is controlled.

  In the first embodiment, the relay area that controls the communication between the relay station and the base station 10 is the relay area 31b that is the first relay area where the mobile station 91a is located, the traveling direction of the mobile station 91a, 1 includes a first relay area and a relay area 31c that is a second relay area adjacent to the first relay area in the right direction. The first monitoring control device 15 according to the first embodiment includes a communication between the relay station 20a that relays communication to the relay area 31b and the base station 10, and a relay station 20b that relays communication to the relay area 31c and the base station. The communication between the relay station 31b and the relay area 31c is controlled to ON, and the communication between each relay station that relays the communication to a relay area different from the relay area 31b and the relay area 31c is controlled. In addition, as shown in FIG. 1, when a plurality of mobile stations are located on the track 90, the on / off control based on one mobile station 91a is different from the on / off control based on the other mobile station 91b. Priority is given to the control to turn on communication.

  In the first embodiment, in downlink communication from the base station 10 to each mobile station, the first monitoring control device 15 controls on / off of each communication between each relay station and the base station 10. Control is performed by turning on and off the power of each high frequency amplifier provided in the machine. Moreover, the 1st monitoring control apparatus 15 performs on / off control of each high frequency amplification part via each 2nd monitoring control apparatus which each relay machine contains.

  Further, in the first embodiment, in uplink communication from each mobile station to the base station 10, the first monitoring control device 15 controls on / off of each communication between each relay station and the base station 10. Control is performed by turning on and off each optical ROF conversion unit provided in the apparatus 10.

  An example of on / off control of the communication performed by the monitoring control unit will be described. First, as shown in FIGS. 1 and 2, downlink communication when the mobile station 91a is located in the relay area 31b will be described. The mobile station 91a transmits the position information to the base station 10. The base station 10 transmits a signal including the position information of the mobile station 91a to the position information data server 40 via the cable 80 and stores it. The first monitoring control device 15 acquires the position information of the mobile station 91a from the position information data server 40. The first monitoring control device 15 sets a relay ON control area from the position information of the mobile station 91a and the position information of each relay area. In FIG. 1, the first monitoring control device 15 sets a relay area 31b, which is a first relay area where the mobile station 91a is located, and a relay area 31c, which is a second relay area adjacent thereto, as relay ON control areas. . The first monitoring control device 15 determines a relay device that relays communication to the relay ON control area. That is, the first monitoring control device 15 determines that the relay device 20a and the relay device 20b are relay devices that relay communication to the relay ON control area. The first monitoring control device 15 transmits an instruction to control the power of the high-frequency amplification unit 21a to be turned on, to the second monitoring control device 23a connected to the high-frequency amplification unit 21a of the repeater 20a. The second monitoring control device 23a shown in FIG. 4 sets the power supply of the high frequency amplification unit 21a to on according to the instruction. Similarly, the first monitoring controller 15 turns on the power of the high-frequency amplifier included in the relay 20b to the second monitoring controller connected to the high-frequency amplifier included in the relay 20b, although not shown. Send instructions to control. The second monitoring control device of the repeater 20b sets the power of the high-frequency amplifier of the repeater 20b to on according to the instruction.

  On the other hand, the first monitoring control device 15 also determines each relay machine that does not relay communication to the relay ON control area. The 1st monitoring control apparatus 15 transmits the instruction | indication which controls the power supply of each high frequency amplification part to each 2nd monitoring control apparatus connected to each high frequency amplification part which each of these repeaters includes. Each second monitoring control device turns off the power of each high-frequency amplifier according to the instruction. For example, in FIG. 1, when the mobile station is not located in the relay area 31a or the relay area 31b, the relay area 31b is not included in the relay ON control area. Therefore, the 1st monitoring control apparatus 15 transmits the instruction | indication which controls the power supply of the high frequency amplification part 21a to the 2nd monitoring control apparatus 23a connected to the high frequency amplification part 21a which the repeater 20a contains. The second monitoring control device 23a turns off the power of the high-frequency amplifier 21a according to the instruction.

  Next, control of uplink communication in which the mobile station 91a shown in FIGS. 1 and 2 transmits a communication signal to the base station 10 will be described. The setting of the relay ON control area and determination of the relay that relays communication to the relay ON control area performed by the first monitoring control device 15 shown in FIG. 3 are the same as described above. The first monitoring control device 15 controls to turn on the power of the optical ROF conversion unit 14a connected to the repeater 20a determined to relay communication to the relay ON control area. Similarly, the first monitoring control device 15 controls to turn on the power of the optical ROF conversion unit 14b connected to the repeater 20b.

  On the other hand, the 1st monitoring control apparatus 15 controls the power supply of each optical ROF conversion part connected to each relay machine determined not to relay communication to a relay ON control area. For example, in FIG. 1, when the mobile station 91a is not located in the relay area 31a or the relay area 31b, the relay area 31b is not included in the relay ON control area. That is, the relay machine 20a does not relay communication to the relay ON control area. Therefore, the first monitoring control device 15 controls the optical ROF conversion unit 14a connected to the repeater 20a to be turned off.

  The above-described on / off control of each high-frequency amplification unit by the first monitoring control device 15 and each second monitoring control device and the on / off control of each optical ROF conversion unit by the first monitoring control device 15 are the processing described above. It is described as a program in a memory included in the circuit, and is realized by the CPU executing the program.

(effect)
The first monitoring control device 15 and each second monitoring control device control the turning on / off of the power of the high frequency amplifying unit of each repeater according to each relay area where each mobile station is located, whereby the LCX relay system 100 It is possible to reduce the frequency with which the power supply of the high-frequency amplification unit provided in all the repeaters provided is always ON. As a result, power saving of the LCX relay system 100 can be achieved.

  Further, the first supervisory control device 15 controls the power on / off of each optical ROF conversion unit provided in the base station 10 according to each relay area in which each mobile station is located, whereby the distributor / combiner 12. However, when combining high-frequency signals, unnecessary signals received from the relay area where the mobile station is not located are not combined. As a result, noise can be reduced, and uplink communication line quality can be improved.

  In summary, the LCX relay system 100 of the first embodiment includes a base station 10, a plurality of relays, a leaky coaxial cable (LCX) that connects the base station 10 and the plurality of relays in series, A location information data server 40 capable of storing location information of a mobile station that moves along the LCX and can communicate with the base station via the LCX and the relay, and is connected to the location information data server 40 and the base station 10 A monitoring control unit that controls the station 10 or connects to the location information data server 40 and the relay unit to control the relay unit, and the monitoring control unit is configured such that the relay unit is connected to the mobile station and the base station 10 via the LCX. On / off control of communication between the relay station and the base station 10 is controlled based on the position information of the relay area that relays communication with the mobile station and the position information of the mobile station stored in the position information data server. With the configuration as described above, the LCX relay system 100 can realize power saving control or improvement in communication quality based on the location information of the mobile station.

  In addition, the supervisory control unit of the LCX relay system 100 according to the first embodiment controls communication between the relay station that relays communication to the relay area where the mobile station is located and the base station 10 so that the mobile station is located. The communication between the base station 10 and at least a part of the repeaters included in the repeater that relays communication to the relay area that is not controlled is controlled. With the configuration as described above, the LCX relay system 100 can realize power saving of an apparatus related to communication between the relay station and the base station 10 or improve communication quality between the relay station and the base station 10.

  In addition, the relay area of LCX relay system 100 according to the first embodiment includes a first relay area where the mobile station is located and a second relay area adjacent to the first relay area in the traveling direction of the mobile station. The unit controls communication between the relay station that relays communication to the first relay area and the base station 10 and communication between the relay station that relays communication to the second relay area and the base station 10. Then, the communication between the relay station that relays the communication to a relay area different from the first relay area and the second relay area and the base station 10 is controlled. With the above-described configuration, the LCX relay system 100 saves devices related to communication between the relay station and the base station 10 while establishing communication between the base station 10 and the mobile station without delaying the moving speed of the mobile station. It is possible to realize power generation or improve communication quality between the relay station and the base station 10.

  In addition, the relay unit of LCX relay system 100 according to the first embodiment is connected to the monitoring control unit, LCX, and base station 10, and is an amplification unit that amplifies a communication signal that communicates between LCX and base station 10. The monitoring control unit controls on / off control of communication between each relay station and the base station 10 by turning on / off each amplification unit provided in each relay station. With the configuration as described above, the LCX relay system 100 can achieve power saving by suppressing the power consumption of the amplifying unit of the repeater.

  The monitoring control unit of the LCX relay system 100 according to the first embodiment includes the first monitoring control device 15 provided in the base station 10 and connected to the location information data server 40, and included in each relay device and included in each relay device. A plurality of second monitoring control devices connected to each amplification unit and the first monitoring control device 15, and the first monitoring control device 15 turns on / off each amplification unit via each second monitoring control device. Take control. With the configuration as described above, the LCX relay system 100 can concentrate the power on / off control of the amplifier included in the relay on the first monitoring control device 15. Therefore, the cost of the LCX relay system 100 can be reduced.

  Further, the base station 10 of the LCX relay system 100 according to the first embodiment includes an electrical signal that is connected to the monitoring control unit and each repeater and communicates within the base station 10, and the base station 10 and each repeater. And a plurality of photoelectric conversion units that convert optical signals that communicate with each other, and the supervisory control unit controls on / off of communication between each repeater and the base station 10 with respect to each photoelectric unit provided in the base station 10. Control by turning on / off the converter. With the above configuration, the LCX relay system 100 can reduce unnecessary noise on the line and improve the signal-to-noise ratio. As a result, the LCX relay system can improve communication line quality.

  The monitoring control unit of the LCX relay system 100 according to the first embodiment includes a first monitoring control device 15 provided in the base station 10 and connected to each photoelectric conversion unit and the position information data server 40. The device 15 controls on / off of each photoelectric conversion unit. With the configuration as described above, the LCX relay system 100 can concentrate on / off control of the photoelectric conversion unit on the first monitoring control device 15, leading to cost reduction.

<Embodiment 2>
The LCX relay system 200 in the second embodiment will be described. Note that the description of the same configuration and operation as in the first embodiment will be omitted. FIG. 5 is a diagram showing an overall configuration of the LCX relay system 200 according to the second embodiment, and FIG. 6 is a diagram showing a configuration of the repeater 20a included in the LCX relay system 200 shown in FIG.

  Each repeater of the LCX relay system 200 according to the second embodiment is connected to the position information data server 40 via the optical fiber cable 61 as shown in FIGS. More specifically, taking the repeater 20 a shown in FIG. 6 as an example, the second monitoring control device 23 a included in the repeater 20 a is connected to the position information data server 40 by the optical fiber cable 61. Other configurations of the relay machine 20a are the same as those in the first embodiment.

  A monitoring control operation based on the position information of the mobile station will be described. Similar to Embodiment 1, each mobile station transmits location information to base station 10, and base station 10 stores the location information of each mobile station in location information data server 40. In the first embodiment, the first monitoring control device 15 sets the relay ON control area and determines whether or not it is a relay machine that relays communication to the relay ON control area. Each second monitoring control device provided in the machine performs the setting and determination. The second monitoring control device provided in the relay that relays communication to the relay ON control area controls the power of the high-frequency amplifier connected to the second monitoring control device to be on. Similarly, the second monitoring control device provided in the relay device that does not relay communication to the relay ON control area controls the power of the high-frequency amplifier connected to the second monitoring control device to be turned off.

  An example of on / off control of the communication performed by the monitoring control unit will be described. The relay 20a shown in FIG. 6 will be described as an example. The mobile station 91a is assumed to be located in the relay area 31b as shown in FIG. The second monitoring control device 23a of the relay machine 20a acquires the position information of the mobile station 91a from the position information data server 40. The second monitoring control device 23a sets the relay area 31b, which is the first relay area where the mobile station 91a is located, and the relay area 31c, which is the second relay area adjacent thereto, to the relay ON control area. The second monitoring control device 23a determines that the relay device 20a provided with the second monitoring control device 23a is a relay device that relays communication to the relay area 31b included in the relay ON control area. The second monitoring control device 23a controls to turn on the power of the high frequency amplification unit 21a included in the repeater 20a. As a different example, although not shown, when the mobile station is located in the relay area 31a, the second monitoring control device 23a sets the relay ON control area in the same manner as described above, and the repeater 20a is relay ON. It determines with it being a relay machine which relays communication to the relay area 31b contained in a control area. The second monitoring control device 23a controls to turn on the power of the high frequency amplification unit 21a included in the repeater 20a.

  On the other hand, although not shown, a case where the mobile station is located in a relay area different from the relay area 31a or the relay area 31b will be described. The second monitoring control device 23 a acquires the location information of the mobile station from the location information data server 40. The second monitoring control device 23a sets the first relay area and the second relay area where the mobile station is located as the relay ON control area. The second monitoring control device 23a determines that the relay device 20a provided with the second monitoring control device 23a is not a relay device that relays communication to the relay ON control area. The second monitoring control device 23a controls the power of the high frequency amplification unit 21a included in the repeater 20a to be turned off.

  The on / off control of each high-frequency amplification unit by each of the second monitoring control devices described above is described as a program in the memory described above, and is realized by the CPU executing the program.

  In summary, the monitoring control unit of the LCX relay system 200 according to the second embodiment includes a plurality of second monitoring units that are provided in each relay unit and connected to each amplification unit included in each relay unit and the position information data server 40. Each of the second monitoring control devices including the control device controls on / off of each amplification unit. With the configuration as described above, the LCX relay system 200 can execute the control related to turning on / off of the amplifying unit of the relay device by distributing it to each second monitoring control device. Therefore, the control speed for turning on / off communication is improved.

<Embodiment 3>
In the third embodiment, an LCX relay network in which a plurality of LCX relay systems are connected will be described. Note that the description of the same configuration and operation as in the first embodiment will be omitted. FIG. 7 is a diagram illustrating an overall configuration of the LCX relay network according to the third embodiment. The LCX relay network includes a base station 10a, a first LCX relay system 300 including a plurality of relay units from the relay unit 20a to the terminal rack 25, a base station 10b, and a plurality of relay units from the relay unit 20z to the relay unit 20q. And a second LCX relay system 400 including a machine. Of the plurality of relay units included in the first LCX relay system 300, the relay unit provided at the end thereof is the terminal rack 25, and the terminal rack 25 is a relay provided at the end of the second LCX relay system 400 via the LCX 30p. Connected to the machine 20q. Other configurations of the first LCX relay system 300 and the configuration of the second LCX relay system 400 are the same as those of the LCX relay system 100 described in the first embodiment. Each LCX relay system may have the same configuration as the LCX relay system 200 described in the second embodiment.

  FIG. 8 is a diagram showing the configuration of the terminal rack 25. The terminal rack 25 includes the same configuration as that of the repeater 20a, that is, a high-frequency amplifier 21n, an optical ROF converter 22n, and a second supervisory controller 23n, and further includes a frame timing detector 24. The frame timing detection unit 24 differs between the timing of the radio frame included in the high frequency signal output in the first LCX relay system 300 and the timing of the radio frame included in the high frequency signal output in the second LCX relay system. For example, a phase difference is detected. The frame timing detection unit 24 outputs the detected radio frame timing phase difference to the second monitoring control device 23n. The second monitoring control device 23n transmits the radio frame timing phase difference to the first monitoring control device 15 of the base station 10a. Further, the radio frame timing phase difference is input from the first monitoring control device 15 to the interface device 18, and the interface device 18 determines the timing of the radio frame included in the high-frequency signal output from the base station 10a based on the phase difference. Correction is performed to generate a new radio frame.

  The terminal rack 25 measures a radio frame shift between the base station 10a and the base station 10b. The monitoring controller included in the first LCX relay system 300 controls communication between the terminal rack 25 and the base station 10a to be always on regardless of the position information of the mobile station 91a so that the measurement does not hinder. More specifically, a first monitoring control device (not shown) in the base station 10a included in the first LCX relay system 300 always supplies power to the high frequency amplification unit 21n of the terminal rack 25 to the second monitoring control device 23n. The second monitoring control device 23n sets the power supply of the high-frequency amplifier 21n to always on according to the instruction. The first supervisory control device controls the power supply of the optical ROF conversion unit (not shown) in the base station 10a connected to the terminal rack 25 to be always on.

  In summary, the LCX relay network according to the third embodiment includes the first LCX relay system 300 and the second LCX relay system 400, and the first LCX relay system 300 is provided at the end of the first LCX relay system 300. 2 includes a termination rack 25 connected to a repeater 20q provided at the termination of the LCX relay system 400 via the LCX 30p. The termination rack 25 includes a timing of a radio frame included in a communication signal in the first LCX relay system 300, 2 includes a frame timing detection unit 24 that detects a difference from the timing of a radio frame included in a communication signal in the 2LCX relay system 400, and the monitoring control unit included in the first LCX relay system 300 includes the terminal rack 25 and the base station 10a. Control communication always on. With the configuration described above, the LCX relay network can continue to detect a difference in radio frame timing among a plurality of LCX relay systems while realizing power saving and improvement in communication line quality.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  10 base station, 14a optical ROF converter, 15 first supervisory control device, 20a repeater, 20b repeater, 21a high frequency amplifier, 23a second supervisory controller, 24 frame timing detector, 25 terminal rack, 30a LCX, 30b LCX, 30c LCX, 31a relay area, 31b relay area, 31c relay area, 40 location information data server, 91a mobile station, 100 LCX relay system.

Claims (9)

A base station,
With multiple repeaters,
A leaky coaxial cable (LCX) connecting the base station and the plurality of repeaters in series;
A location information data server capable of storing location information of a mobile station that moves along the LCX and can communicate with the base station via the LCX and the relay;
A monitoring control unit that connects to the location information data server and the base station to control the base station, or connects to the location information data server and the relay to control the relay;
The supervisory control unit includes position information of a relay area where the relay relays communication between the mobile station and the base station via the LCX, and the mobile station stored in the position information data server. An LCX relay system that controls on / off of communication between the relay station and the base station based on position information.   The supervisory control unit controls communication between the relay station that relays communication to the relay area where the mobile station is located and the base station, and communicates to the relay area where the mobile station is not located. The LCX relay system according to claim 1, wherein communication between at least a part of the relay stations included in the relay station to be relayed and the base station is cut off. The relay area includes a first relay area where the mobile station is located, and a second relay area adjacent to the first relay area in the traveling direction of the mobile station,
The monitoring control unit is configured to communicate between the relay station that relays communication to the first relay area and the base station, and between the relay station that relays communication to the second relay area and the base station. The communication between the base station and the relay station relaying the communication to the relay area different from the first relay area and the second relay area is controlled. 2. The LCX relay system according to 2. The repeater is
Including an amplifying unit that amplifies a communication signal provided between the monitoring control unit, the LCX, and the base station and communicating between the LCX and the base station;
The said monitoring control part controls the on / off control of the said communication with each said relay machine and the said base station by the on / off of each said amplification part provided in each said relay machine. The LCX relay system according to any one of the above. The monitoring controller is
A first monitoring control device provided in the base station and connected to the location information data server;
A plurality of second monitoring control devices connected to each of the amplifying units included in each of the relay devices and the first monitoring control device;
The LCX relay system according to claim 4, wherein the first monitoring control device controls on / off of each of the amplification units via each of the second monitoring control devices. The monitoring controller is
A plurality of second monitoring and control devices connected to each of the amplification units included in each of the repeaters and the position information data server;
The LCX relay system according to claim 4, wherein each of the second monitoring control devices controls on / off of each of the amplification units. The base station
A plurality of photoelectric converters that are connected to the monitoring control unit and each of the repeaters and convert an electrical signal that communicates within the base station and an optical signal that communicates between the base station and each of the repeaters. Including a conversion part,
The supervisory control unit controls on / off control of the communication between each of the repeaters and the base station by on / off of each of the photoelectric conversion units provided in the base station. The LCX relay system according to any one of the above. The monitoring controller is
Including a first monitoring control device provided in the base station and connected to each of the photoelectric conversion units and the position information data server;
The LCX relay system according to claim 7, wherein the first monitoring control device controls on / off of each of the photoelectric conversion units. A first LCX relay system and a second LCX relay system, which are the LCX relay system according to any one of claims 1 to 8,
The first LCX relay system is provided at a terminal of the first LCX relay system, and includes a terminal rack connected via the LCX to the relay device provided at a terminal of the second LCX relay system,
The terminal rack includes a frame timing detection unit that detects a difference between a timing of a radio frame included in a communication signal in the first LCX relay system and a timing of a radio frame included in a communication signal in the second LCX relay system. Including
The LCX relay network, wherein the monitoring controller included in the first LCX relay system controls communication between the terminal rack and the base station to be always on.

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