KR102029161B1 - Operating method for communication service in a tunnel - Google Patents

Abstract

The present invention discloses a communication service support method. The communication service supporting method may further include generating a transmission signal to be transmitted through a first communication service device provided at an entrance of a tunnel and a second communication service device provided at an exit of the tunnel, and coaxially connected to the first communication service device. Providing a MIMO service based on the coaxial cable-based bidirectional feeding method by transmitting the transmission signal through one end of a cable and transmitting the transmission signal through the other end of the coaxial cable to which the second communication service device is connected. It may include.

Description

Operating method for communication service in a tunnel}

The present invention relates to a communication service operating method for providing a wireless input environment based on multiple input multiple output (MIMO) in a tunnel.

Recently, with the development of information and communication technology, various wireless communication technologies have been developed. In addition, while high-speed data transmission is required in a wireless communication environment, interest in a method of increasing the throughput of wireless communication is increasing because there is a limit to the available radio resources.

On the other hand, there is an LCX leaky coaxial cable installed for the FM / DMB service in the tunnel section, and provides the FM / DMB service in the tunnel section.

In addition, LTE-R (LTE railway) antennas are separately installed to support LTE service within the tunnel section, which will be sequentially installed on each national railway network and urban railway line by 2026 according to a nationwide plan.

In case of LTE-R, unlike commercial LTE, in order to increase stability, when tunnel length is less than 400m, it is installed at the starting point / end point for coverage redundancy, so that service continuity is ensured even if one equipment fails. .

However, as described above, in order to support various communication services in the tunnel section, when each communication service equipment is provided, a lot of time, cost, and manpower are required for installation and operation. In addition, the conventional communication service within the tunnel section does not have a MIMO (Multi input multi output) effect even if the signal is transmitted in one direction or in both directions, and thus the signal strength in the middle region of the tunnel is weak, thus providing stable communication service. There was a problem that could not be provided.

Korean Laid-Open Patent Publication No. 10-2014-004210, published on July 30, 2014 (Name: Multiple I / O Antenna System in Tunnel)

The present invention provides a method of operating a communication service for providing a wireless communication environment based on MIMO in a tunnel.

In particular, the present invention is to provide a communication service support method within a tunnel that can stably support a multi-band communication service using a coaxial cable that has been previously established to provide a communication service.

According to an aspect of the present invention, there is provided a communication service supporting method, comprising: generating a transmission signal to be transmitted through a first communication service device provided at an entrance of a tunnel and a second communication service device provided at an exit of the tunnel; MIMO based on the coaxial cable-based bidirectional power feeding method by transmitting the transmission signal through the other end of the coaxial cable to which the second communication service device is connected while transmitting the transmission signal through one end of the coaxial cable to which the communication service device is connected. It provides a step of providing a service.

In the above-described communication service supporting method, the generating may include a broadcast service signal and a mobile communication service signal based on a first communication service device provided at an entrance of the tunnel and a second communication service device provided at an exit of the tunnel. And generating the integrated signal.

The communication service supporting method generates a first combined signal by combining a first transmission signal and a second transmission signal related to a mobile communication service of the first communication service device based on a first coupler provided at an entrance of the tunnel. And a second combined signal identical to the first combined signal by combining the first transmission signal and the second transmission signal related to the mobile communication service of the second communication service device based on the second coupler provided at the exit of the tunnel. It may further include at least one step of generating a.

The communication service supporting method may further include combining the first combined signal and the broadcast service signal based on a first combiner provided at an inlet of the tunnel and using a second combiner provided at an outlet of the tunnel. Based on the above, the method may further include at least one of combining the second combined signal and the broadcast service signal.

In the communication service supporting method, the first communication service device and the second communication service device may have the same cell information.

On the other hand, the present invention can provide a communication service support system. The communication service support system is disposed in the coaxial cable disposed in the tunnel, the inlet of the tunnel, the first communication service device for transmitting the first signal through one end of the coaxial cable and the outlet of the tunnel, And a second communication service device configured to transmit a second signal including the same mobile communication signal as the first signal through the other end of the coaxial cable.

According to the present invention, by using a coaxial cable that is already established for another communication service in a tunnel, it is possible to stably support various communication services while minimizing the installation of equipment for supporting a high speed communication service in the tunnel.

1 is a diagram illustrating an example of a first communication service support system according to an exemplary embodiment of the present invention.
2 is a diagram illustrating an example of a service environment including a first communication service support system according to an exemplary embodiment of the present invention.
3 is a diagram illustrating output characteristics of a first communication service support system according to an exemplary embodiment of the present invention.
4 is a diagram illustrating an example of a communication service supporting method according to an exemplary embodiment of the present invention.
5 is a diagram illustrating an example of a service environment including a second communication service support system according to another embodiment of the present invention.
6 is a view showing another example of a communication service support method according to another embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. It is to be understood, however, that the intention is not to limit the invention to specific embodiments, but to cover various modifications, equivalents, and / or alternatives to the embodiments of the invention. In connection with the description of the drawings, similar reference numerals may be used for similar components.

1 is a diagram illustrating an example of a first communication service support system according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating an example of a service environment including a first communication service support system according to an embodiment of the present invention. Drawing.

1 and 2, a first communication service support system 10 according to an exemplary embodiment of the present invention may include a coaxial cable 50 installed in a tunnel 40, a first broadcast device 110, and a second broadcast device. 210, a first communication network device 120, a second communication network device 220, and a digital unit (DU) 11 connected to the first communication network device 120 and the second communication network device 220. ) May be included. Additionally, the first communication service support system 10 may include a first coupler 101 (eg, 2X2 Hybrid coupler), a first combiner 102 (eg, LCX Hybrid Combine Module), It may include a second coupler 201 and a second combiner 202. Here, although the first broadcast device 110, the first communication network device 120, and the second broadcast device 210 and the second communication network device 220 are shown separately, the respective components are integrated equipment It may be provided as.

For example, the first communication service support system 10 may include a first communication service device 100 and a second broadcast device 210 including a first broadcast device 110 and a first communication network device 120. 2 may include a second communication service device 200 including a communication network device 220. The first communication service device 100 and the second communication service device 200 are electrically connected to the coaxial cable 50 disposed in the tunnel 40, respectively, disposed in the tunnel 40 or the tunnel 40. ) Can be placed outside.

The tunnel 40 may be about a certain length (for example, 400 m), and a train or a vehicle may be moved. The tunnel 40 may include an entrance part through which a train enters, an exit part through which the train enters, and the like. The above-mentioned various communication service devices may be installed in the tunnel 40. For example, a coaxial cable 50 may be installed on the inner wall of the tunnel 40.

The coaxial cable 50 may be disposed at one side in the tunnel. For example, the coaxial cable 50 may be disposed at one side of the inner wall of the tunnel 40 while crossing the tunnel 40 in the longitudinal direction. The coaxial cable 50 may comprise, for example, an LCX leaky coaxial cable. The first broadcasting device 110 and the first communication network device 120 may be connected to one end of the coaxial cable 50. The second broadcast device 210 and the second communication network device 220 may be connected to the other end of the coaxial cable 50. The coaxial cable 50 serves as an antenna for transmitting and receiving signals transmitted from the first broadcast device 110, the first communication network device 120, the second broadcast device 210, and the second communication network device 220. Can be performed.

The first broadcast apparatus 110 may be electrically connected to one end of the coaxial cable 50 and transmit a signal of at least one first frequency band through the coaxial cable 50. For example, the first broadcast apparatus 110 may transmit a signal in the FM / DMB frequency band through the coaxial cable 50. The first broadcast apparatus 110 may be disposed, for example, at the inlet of the tunnel 40.

The second broadcasting device 210 may be electrically connected to the other end of the coaxial cable 50. The second broadcast device 210 may include substantially the same broadcast device as the first broadcast device 110. For example, the second broadcast device 210 may transmit a signal in the FM / DMB frequency band through the coaxial cable 50. The second broadcast device 210 may be disposed at the exit of the tunnel 40.

The first communication network device 120 may be electrically connected to one end of the coaxial cable 50. The first communication network device 120 may output and receive a signal of a second frequency band through the coaxial cable 50. For example, the first communication network device 120 may transmit and receive a signal in a mobile communication frequency band (for example, a signal in an LTE frequency band) through the coaxial cable 50. The first communication network device 120 may be disposed at an inlet of the tunnel 40.

The second communication network device 220 may be electrically connected to the other end of the coaxial cable 50. The second communication network device 220 may include substantially the same network device as the first communication network device 120. For example, the second communication network device 220 may transmit and receive a signal in a mobile communication frequency band (for example, a signal in an LTE frequency band) through the coaxial cable 50. The second communication network device 220 may be disposed at the exit of the tunnel 40.

The DU 11 is connected to the first communication network device 120 and the second communication network device 220, and designated movement through the first communication network device 120 and the second communication network device 220. A communication signal can be output. The DU 11 may perform copy cell processing of the first communication network device 120 and the second communication network device 220.

The first coupler 101 may combine transmission signals (eg, TX0 and TX1) transmitted by the first communication network device 120. The first coupler 101 may transmit the combined first combined signal to the first combiner 102. The first coupler 101 may be connected to the coaxial cable 50 to transmit a mobile communication service signal (eg, an LTE-R signal) received through the coaxial cable 50 to the first communication network device 120. . The first coupler 101 may be disposed at an inlet of the tunnel 40.

The first combiner 102 may be connected between an output terminal of the first broadcast apparatus 110 and an output terminal of the first coupler 101. The first combiner 102 is an FM / DMB signal transmitted from the first broadcast device 110 and a mobile communication service signal transmitted from the first communication network device 120 (eg, LTE-R signal, TX0). And a first combined signal to which TX1 is combined. The first combiner 102 can transmit the integrated first integrated signal to the coaxial cable 50. The first combiner 102 may be disposed at an inlet of the tunnel 40.

The second coupler 201 may combine transmission signals (eg, TX0 and TX1) transmitted by the second communication network device 220. The second coupler 201 may transmit the combined second combined signal to the second combiner 202. The second coupler 201 may be connected to the coaxial cable 50 to transmit a mobile communication service signal (eg, an LTE-R signal) received through the coaxial cable 50 to the second communication network device 220. . The second coupler 201 may be disposed at an outlet of the tunnel 40.

The second combiner 202 may be connected between an output terminal of the second broadcasting device 210 and an output terminal of the second coupler 201. The second combiner 202 is an FM / DMB signal transmitted from the second broadcast device 210 and a mobile communication service signal transmitted from the second communication network device 220 (eg, LTE-R signal, TX0). And a second combined signal to which TX1 is combined. The second combiner 202 may transmit the integrated second integrated signal to the coaxial cable 50. The second combiner 202 may be disposed at an inlet of the tunnel 40.

The first communication service support system 10 as described above combines and integrates the FM / DMB signal and the LTE-R signal by using the couplers 101 and 201 and the combiners 102 and 202. Reference numeral 50 can be used to enable the transmission of a plurality of frequency band signals. The first communication service support system 10 may provide a MIMO level communication service performance by switching the performance of a single input single output (SISO) level to a bidirectional power feeding method during unidirectional power supply.

In order to provide a MIMO service, the first communication service support system 10 of the present invention performs a bidirectional power supply on both sides of the coaxial cable 50, but a copy cell such that each of the supplied signals exhibits the effect of the same signal. ) Can be configured. For example, the first communication network device 120 and the second communication network device 220 may be bundled into a copy cell. Alternatively, the first communication network device 120 may operate by copying Cell information of the second communication network device 220, or the second communication network device 220 may operate on Cell information of the first communication network device 120. Can be operated by copying. The Copy Cell may be a method of allocating up to 2 to 4 channel ports of the DU 11 (data processing unit, digital unit) of the DU 11 and assigning them to one Cell ID.

3 is a diagram illustrating output characteristics of a first communication service support system according to an exemplary embodiment of the present invention.

As shown in FIGS. 2 and 3, when the coaxial cable 50 is used in the bidirectional power feeding method in the first communication service support system 10 using the coaxial cable 50 in the tunnel 40, the output characteristic is 301. May appear as: For example, according to bidirectional power feeding, an A-Path is formed in the tunnel 40 by inlet communication equipment (eg, the first broadcasting device 110 and the first communication network device 120), and the outlet communication. The B-Path may be formed by the devices (eg, the second broadcasting device 210 and the second communication network device 220). In this case, the A-Path and the B-Path have a dual polarization structure, and thus, the first communication service support system 10 may perform MIMO performance as shown in state 303 due to three RSRP signals. Can provide. In the figure, the MIMO performance interval has been described as 10 dB (A-Path and B-Path output characteristic difference values), but the present invention is not limited thereto. For example, in an ideal or experimental environment, the MIMO performance interval may be 13 dB.

As described above, the first communication service support system 10 transmits a broadcast service signal (eg, FM / DMB) and a mobile communication service signal (LTE-R) to the coaxial cable 50 at both ends of the tunnel 40. Signal) can support the method of injecting the integrated signal. In the case of the tunnel 40, since the RRUs (Remote Radio Units) are installed at the entrance and the exit for coverage redundancy, the first communication service support system 10 of the present invention can support stable communication service without installing additional equipment. Can be.

4 is a diagram illustrating an example of a communication service supporting method according to an exemplary embodiment of the present invention.

2 and 4, in step 401, a combination of transmission signals of the first communication network device 120 and a combination of transmission signals of the second communication network device 220 may be performed. Can be. For example, the first coupler 101 connected to the first communication network device 120 combines TX0 and TX1 signals to generate a first combined signal, and the second coupler 201 connected to the second communication network device 220. May combine the TXO and TX1 signals to generate a second combined signal. The first communication network device 120 and the second communication network device 220 may generate a signal based on the same cell ID through copy cell allocation. Accordingly, the first combined signal and the second combined signal may include the same mobile communication service signal.

In operation 403, the first broadcast signal (or the first broadcast service signal) of the first broadcast device 110 and the combined first combined signals of the first communication network device 120 are integrated to generate a first integrated signal. The second combined signal of the second broadcast signal (or the second broadcast service signal) of the second broadcast device 210 and the second combined signal of the second communication network device 220 may be integrated to generate a second integrated signal. In this regard, the first broadcaster 110 and the first combiner 102 connected to the first coupler 101 may transmit a first broadcast signal (eg, a first FM / DMB signal) of the first broadcast device 110. ) And the first combined signal coupled by the first coupler 101 may be combined to generate a first integrated signal. The second combiner 202 connected to the second broadcast device 210 and the second coupler 201 may be configured to generate a second broadcast signal (eg, a second FM / DMB signal) of the second broadcast device 210 and the second combiner 202. A second combined signal may be generated by integrating the second combined signal coupled by the two couplers 201. At least a mobile communication service signal (eg, an LTE service signal) among the signals included in the first integrated signal and the second integrated signal may include the same signal.

In operation 405, the first integrated signal may be transmitted through one end of the coaxial cable 50, and the second communication signal may be transmitted through the other end of the coaxial cable 50. For example, the first combiner 102 provides the generated first integrated signal at one end of the coaxial cable 50, and the second combiner 202 provides the generated second integrated signal to the coaxial cable 50. Can be provided at the other end of. The communication service supporting method may be repeatedly performed while power is supplied. As described above, the mobile communication service supporting method of the present invention can provide the MIMO service by supplying the same mobile communication service signal at both ends of the coaxial cable 50, respectively.

5 is a diagram illustrating an example of a service environment including a second communication service support system according to another embodiment of the present invention.

Referring to FIG. 5, the second communication service support system 20 according to another embodiment of the present invention may include a coaxial cable 50 disposed in the tunnel 40 and a broadcast service signal disposed at an entrance of the tunnel 40. (E.g., an FM / DMB signal) and a first communication service device 100 capable of transmitting and receiving a mobile communication service signal (e.g., an LTE signal), and a broadcast service disposed at an exit of the tunnel 40. The second communication service device 200, the first coupler 101, and the first combination that transmit a signal (for example, an FM / DMB signal) and transmit and receive a mobile communication service signal (for example, an LTE signal). You 102, the second coupler 201, the second combiner 202, at least one communication performance measuring device (eg, the first communication performance measuring device 109 and the second communication performance measuring device 209) ) May be included.

In the above-described configuration, the first coupler 101, the first combiner 102, the second coupler 201, and the second combiner 202 are the first coupler mentioned in the description of FIG. 2. It may include the same configuration as the configuration of the first combiner, the second coupler, the second combiner.

The first communication service device 100 controls, for example, operation of a first broadcast module related to FM / DMB signal transmission, a first communication network module supporting LTE communication, the first broadcast module and the first communication network module. And a control module (or controller) that performs a process related to a failure of the second communication service device 200. The first communication service device 100 may basically support the functions of the first broadcast device 110 and the second communication network device 220 described above with reference to FIG. 2. In addition, the first communication service device 100 may periodically receive a measurement signal from the first communication performance measurement device 109. When the first communication service device 100 receives a specified message (for example, information indicating that the received radio signal has a predetermined value or more) from the first communication performance measuring device 109, the second communication service device ( It may be determined that an abnormality has occurred in 200). When an error occurs in the second communication service device 200, the first communication service device 100 may transmit a message about occurrence of an abnormal state of the second communication service device 200 to a designated server.

The second communication service device 200 controls, for example, operation of a second broadcast module related to FM / DMB signal transmission, a second communication network module supporting LTE communication, the second broadcast module and a second communication network module. And a control module (or controller) that performs a process related to a failure of the first communication service device 200. The second communication service device 200 may provide the same function as the first communication service device 100. In addition, the second communication service device 200 may periodically receive a measurement signal from the second communication performance measurement device 209. When the second communication service device 200 receives a designated message from the second communication performance measuring device 209, the second communication service device 200 may determine that an abnormality has occurred in the first communication service device 100. When an abnormality occurs in the first communication service apparatus 100, the second communication service apparatus 200 may transmit a message about occurrence of an abnormal state of the first communication service apparatus 100 to a designated server or a designated manager terminal apparatus. have.

The first communication performance measuring apparatus 109 may be installed closer to the second communication service apparatus 200 with respect to the center of the tunnel 40. Alternatively, the first communication performance measuring device 109 may be installed close to the exit side of the tunnel 40. The first communication performance measuring apparatus 109 may mainly receive a signal transmitted from the second communication service apparatus 200 at an installed point, and determine the quality of the received signal. When the received wireless signal has a quality equal to or less than a predetermined value (for example, 30 dB or less), a message for guiding an abnormal occurrence of the second communication service device 200 may be transmitted to the first communication service device 100. In this regard, the first communication performance measuring apparatus 109 may detect the signal quality of the radio signal at a predetermined period. In addition, the first communication performance measuring apparatus 109 may detect the signal quality of the radio signal more than a predetermined number of times at a predetermined cycle, and determine whether the detected average value is less than or equal to the specified quality value.

The second communication performance measuring device 209 may be installed closer to the first communication service device 100 based on the center of the tunnel 40. Alternatively, the second communication performance measuring device 209 may be installed close to the inlet side of the tunnel 40. The second communication performance measuring apparatus 209 may mainly receive a radio signal transmitted from the first communication service apparatus 100 at an installed point, and determine the quality of the received radio signal. When the received wireless signal has a quality equal to or less than a predetermined value (for example, 30 dB or less), the second communication service device 200 may transmit a message for guiding the occurrence of an abnormality of the first communication service device 100. The second communication performance measuring device 209 may detect the quality of a wireless signal at regular intervals. In addition, the second communication performance measuring apparatus 209 may detect the quality of the radio signal more than a predetermined number of times at a predetermined cycle, and determine whether the detected average value is less than or equal to the designated quality value.

The first communication performance measuring apparatus 109 and the second communication performance measuring apparatus 209 described above are radios capable of receiving radio signals transmitted by the first communication service apparatus 100 and the second communication service apparatus 200. A signal receiver, a quality meter capable of measuring the quality of a received radio signal (e.g., the strength of the radio signal, etc.), a processor controlling the transmission of a message to a communication service device according to the measured quality, and in connection with message storage and operational control. It may include a memory in which data is stored.

As described above, the second communication service support system 20 of the present invention performs signal processing relating to a broadcast (FM / DMB) service and a mobile communication service (eg, LTE service), and detects an abnormal occurrence of the communication service device. Guide message output can be performed to confirm and take action accordingly. The above-described second communication service support system 20 is one of the first communication service device 100 or the second communication service device 200, if any one of the communication service device failure, the other one communication service that does not fail It is possible to support LTE-R and FM / DMB service through unidirectional power supply based on the device.

6 is a view showing another example of a communication service support method according to another embodiment of the present invention.

Referring to FIG. 6, according to another embodiment of the present disclosure, in step 601, wireless signals may be collected at first and second locations in the tunnel 40, respectively. For example, the first communication performance measuring device 109 in the first position and the second communication performance measuring device 209 in the second position may each receive a signal for quality inspection. In this regard, the first position of the first communication performance measuring device 109 installed in the tunnel 40 is, for example, biased toward the location where the second communication service device 200 is installed (or the second communication service device 200. Location). The second position where the second communication performance measuring device 209 is installed in the tunnel 40 includes a position (or a position close to the first communication service device 100) biased to the side where the first communication service device 100 is installed. can do.

In operation 603, the first communication performance measuring apparatus 109 and the second communication performance measuring apparatus 209 may check the quality of the received signal and determine whether the signal quality is equal to or less than a specified value. In addition, when the quality of the received signal exceeds a specified value, the first communication performance measuring device 109 and the second communication performance measuring device 209 may branch to step 601 and perform the following process again. For example, the first communication performance measuring device 109 and the second communication performance measuring device 209 may receive a radio signal at a predetermined period and measure the strength of the received radio signal. The first communication performance measuring device 109 and the second communication performance measuring device 209 may check whether the strength of the radio signal is equal to or less than a specified dB.

If the quality of the received signal is less than or equal to the specified value, in step 605, the first communication performance measuring apparatus 109 or the second communication performance measuring apparatus 209 sends a message for guiding the occurrence of an abnormality of the communication service apparatus. Can be delivered to. For example, when the quality of the received signal is equal to or less than a specified value, the first communication performance measuring apparatus 109 may transmit a message to the first communication service apparatus 100 to guide occurrence of an abnormality of the second communication service apparatus 200. have. When the quality of the received signal is equal to or less than a specified value, the second communication performance measuring apparatus 209 may transmit a message to the second communication service apparatus 200 to guide the occurrence of an abnormality of the first communication service apparatus 100.

When the first communication service device 100 or the second communication service device 200 receives an error occurrence message, the first communication service device 100 or the second communication service device 200 may deliver the message to a designated server device or a designated manager terminal device.

The above-described communication service support system and method of the present invention can provide MIMO performance without installing a separate LTE-R antenna by utilizing a leaky coaxial cable installed for FM / DMB signal transmission, for example, in a tunnel section of about 400m. Can provide high quality service. That is, the system and method of the present invention can provide an effect of reducing the antenna, feeder, construction cost, etc. when using the LTE-R antenna by utilizing the leaky coaxial cable. In addition, the communication service support system and method of the present invention can provide a coverage redundancy function utilizing a leaky coaxial cable in a tunnel section. In the LTE-R business, communication between controllers and engine operators operating trains must be continuous. If communication is not possible, the possibility of major accidents increases. The communication service support system and method of the present invention can provide a continuous service even if a failure occurs in one of two RRUs (Remote Radio Units) installed at an entrance and an exit of a tunnel section, by providing the service by the remaining equipment. . In the case of a general antenna system, when the failure occurs, it is necessary to adjust the output of the remaining equipment for the coverage shadow period, but in the case of the leaky coaxial cable applied to the present invention, it is possible to provide continuous service without additional processing. In addition, the present invention can check the abnormal state of the communication service support device, and transmit a guide message for repair and treatment accordingly, thereby supporting the management of the communication service device more easily.

The embodiments disclosed in the above-described document are presented for the purpose of explanation and understanding of the disclosure, and are not intended to limit the scope of the invention. Therefore, the scope of the present disclosure should be construed to include all changes or various other embodiments based on the technical spirit of the present disclosure.

FIELD OF THE INVENTION The present invention applies to the field of wireless communications, and more particularly relates to wireless communication systems built in tunnels.

In particular, the present invention can stably support the MIMO communication service while minimizing the installation of equipment for supporting the high-speed communication service in the tunnel by using the coaxial cable that is already built for other communication services in the tunnel.

40: tunnel
50: coaxial cable
101, 201: first and second coupler
102, 202: First and second combiners
100, 200: first and second communication service apparatus
110, 210: First and second broadcast device
120, 220: first and second communication network devices
109, 209: first and second communication performance measuring device

Claims (6)

Generating a transmission signal to be transmitted through a first communication service device provided at an entrance of the tunnel and a second communication service device provided at an exit of the tunnel; And
The coaxial cable-based bidirectional power feeding method by transmitting the transmission signal through the other end of the coaxial cable to which the second communication service device is connected while transmitting the transmission signal through one end of the coaxial cable to which the first communication service device is connected. Providing a multi-input multi-output (MIMO) service based on this;
Including,
The first communication service device and the second communication service device are operated as a copy cell so that each outgoing signal can exhibit the effect of the same signal,
The interval for providing the MIMO service is a period in which an output characteristic difference value between the transmission signal of the first communication service device and the transmission signal of the second communication service device is a predetermined value or less. The method of claim 1,
The generating step
Generating an integrated signal integrating a broadcast service signal and a mobile communication service signal based on a first communication service device provided at an entrance of the tunnel and a second communication service device provided at an exit of the tunnel; Characterized in that the communication service support method. The method of claim 1,
Generating a first combined signal by combining a first transmission signal and a second transmission signal related to a mobile communication service of the first communication service device based on a first coupler provided at an entrance of the tunnel; And
A second combined signal identical to the first combined signal is generated by combining the first transmission signal and the second transmission signal related to the mobile communication service of the second communication service device based on the second coupler provided at the exit of the tunnel. Making; The communication service supporting method further comprising at least one step. The method of claim 3,
Combining the first combined signal with a broadcast service signal based on a first combiner provided at an entrance of the tunnel; And
Combining the second combined signal and the broadcast service signal based on a second combiner provided at an exit of the tunnel; The communication service supporting method further comprising at least one step. The method of claim 1,
And the first communication service device and the second communication service device have the same cell information. Coaxial cable disposed within the tunnel;
A first communication service device disposed at an inlet of the tunnel and transmitting a first signal through one end of the coaxial cable; And
A second communication service device disposed at an exit of the tunnel and transmitting a second signal including the same mobile communication signal as the first signal through the other end of the coaxial cable;
Including,
The first communication service device and the second communication service device are operated by being tied to a copy cell so that the first signal and the second signal can exhibit the same signal effect.
Providing a MIMO service in the tunnel by performing bidirectional power supply with the coaxial cable through the first communication service device and the first communication service device,
The interval for providing the MIMO service is a period in which the output characteristic difference value between the transmission signal of the first communication service device and the transmission signal of the second communication service device is a predetermined value or less.

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