KR100442132B1 - Optical Distribution System for Tunnel in mobile communication network - Google Patents

Abstract

The present invention relates to a light distribution system for tunnels to solve poor communication areas in long tunnels, such as railway tunnels, and to smoothly connect with an external radio wave environment. A high frequency unit (RF Unit) 320 which performs an automatic gain adjustment function and transmits a signal of a predetermined level to the optical splitting transmission module 321; The optical splitting transmission module 321 for converting the electrical communication signal received from the RF unit 320 into an optical signal and distributing and transmitting the same to a plurality of Tunnel Remote Antenna Units (TRAU) 330; And a tunnel remote antenna unit 330 capable of serving in the tunnel, and when the system of the present invention is applied to a tunnel, the RF unit 320 and the optical split transmission as optical relay and transmission means. The modules 321 are directly connected to each other and installed at the tunnel entrance, and the plurality of TRAUs 330 are distributed in the tunnel to solve the shadow area.

Description

Optical Distribution System for Tunnel in Mobile Communication Network

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light distribution system for tunnels in a mobile communication network, and more particularly, to a light dispersion system for tunnels to solve poor communication areas in long tunnels such as railway tunnels and to smoothly connect with an external radio wave environment. will be.

In general, a vehicle or railway tunnel is formed in a shaded area in which the inside is blocked from an external radio wave environment and cannot be called. Therefore, an optical type or an RF type repeater is installed at the tunnel entrance. In order to solve the area of poor call inside the tunnel, the center part of the tunnel still does not completely eliminate the radio shadows, and furthermore, in tunnels and / or curved tunnels of very long length, such as railway tunnels. In this case, the call is disconnected because the repeater installed at the entrance of the tunnel cannot connect with the external radio wave environment to the central part of the tunnel.

The present invention was created in order to solve the above problems, the object of which is to make a smooth propagation link between the internal tunnel and the external propagation environment such as a long tunnel, so as to solve the poor communication area therein To provide a light distribution system for tunnels.

1 is a block diagram of a light distribution system for a tunnel according to an embodiment of the present invention,

2 is a block diagram illustrating the light distribution system of the tunnel of FIG. 1 according to an embodiment of the present invention in more detail.

3 is a block diagram of a light distribution system for a tunnel according to another embodiment of the present invention,

4 is a block diagram illustrating in detail the light distribution system for the tunnel of FIG. 3 according to another embodiment of the present invention.

※ Explanation of code for main part of drawing

10,11a, 11b, 11c, 11n, 12a, 12b, 12n: optical line

13a, 13b, ..., 13n: feed line

14a, 14b, ..., 14n: Yagi Antenna

111,310 Base stations

110: all-optical photoelectric conversion unit (MOS)

120: optical relay / transmitter (DHS)

130, 130a, 130b, 130n, 330, 330a, 330b, 330n: photoelectric / electric conversion unit (TRAU)

320: high frequency relay unit (RFU)

321: optical split transmission unit

In order to achieve the above object, a light distribution system for a tunnel according to the present invention includes: relay means for remotely receiving / transmitting forward / reverse communication signals from / to a base station; Optical transmission means for remotely dividing the communication signal relayed by the relay means into a plurality of optical signals; And a photoelectric / electric photoelectric converter converting the plurality of optical signals into electrical signals at predetermined length intervals and converting a corresponding reverse signal into an optical signal; and converting the electrical signals converted through the photoelectric converter into a predetermined length. A feed line for extending and radiating leakage and receiving the reverse signal corresponding thereto and providing the reverse signal to the all-optical converter; and a Yagi antenna provided at an end of the feed line, to distribute an optical signal corresponding to the communication signal. It comprises a light scattering means for.

The relay means is a repeater of a high frequency type (RF type) for remotely receiving / transmitting and transmitting a radio signal to / from the base station, or a repeater of an optical type for remotely receiving / transmitting an optical signal to / from the base station It consists of.

The optical transmission means is configured to transmit transmissions of the divided plurality of optical signals at different intervals at different intervals, and the photoelectric / electric conversion unit is provided on the end of the transmission path of the respective optical signals to transmit each photoelectric / optical signal. Characterized in that the conversion unit is arranged at a predetermined interval from each other, the feed line is extended to both sides from the photoelectric / all-optical conversion unit is installed in parallel to the optical transmission line, each end between the adjacent feed line is installed so as to be spaced apart a certain interval In addition, the installation interval between the photoelectric / all-optical conversion unit and the length of the feed line is characterized in that it is set by the relationship to the gain of the Yagi antenna relative to the loss per unit length of the feed line.

Hereinafter, a light distribution system for a tunnel according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a light distribution system for a tunnel according to an embodiment of the present invention, which shows a light type system. In the figure, reference numeral 111 denotes a base station (BTS), and reference numeral 110 denotes the base station. A master optical shelf (MOS) connected to a donor hub shelf (DHS) 120 and one core of an optical line 10 in a configuration directly connected to the 111 is shown. Reference numeral 120 denotes the DHS 120 that distributes the optical signal received from the MOS 120 to a plurality of Tunnel Remote Antenna Units (TRAU) 130, and reference numeral 130 denotes a service inside the tunnel. As the TRAU 130 capable of doing the above, it is possible to use an antenna ANT or a feed line (or leakage line) (LCX) in a duplex manner.

When the optical dispersion system of the optical type tunnel according to the present invention as shown in FIG. 1 is applied to the tunnel, the MOS 110 is provided in the base station 111, and the DHS 120 as an optical relay and transmission means Installed at the tunnel entrance, the plurality of TRAU 130 is distributed in the tunnel.

2 is a block diagram illustrating the light distribution system of the tunnel of FIG. 1 according to an embodiment of the present invention in more detail.

Referring to FIG. 2, a direct signal connected to a base station (BTS) 111 converts a forward communication signal transmitted from the base station 111 into an optical signal, and also converts an optical signal of a reverse direction transmitted to the base station 111 into a communication signal. An all-optical / photoelectric conversion unit 110 as the MOS 110 in FIG. Forward optical signal transmitted through the optical line 10 from the all-optical / photoelectric conversion unit 110 and the core (optical) optical line 10 through the optical line 10 from the all-optical / photoelectric conversion unit 111 Is divided into a plurality of optical signals, and the divided forward optical signals are relayed and transmitted through one core transmission optical line (11a, 11b, ... 11n), respectively, and the reverse optical signals are each one core. Optical relay as the DHS 120 of FIG. 1 which receives the received optical paths 12a, 12b, ... 12n of the receiver and relays them to the input of the all-optical / photoelectric conversion unit 111 through the optical path 10 Transmission unit 120; Each transmission or reception optical path is installed on the transmission optical paths 11a, 11b, ... 11n and the reception optical paths 12a, 12b, ... 12n at a predetermined distance (for example, at intervals of 700 m). Photoelectric / electrical light conversion unit 130a as the TRAU 130 of FIG. 1 for photoelectric or electro-optical conversion of forward and reverse optical signals through (11a, 11b, ... 11n) (12a, 12b, ... 12n) 130b, ... 130n); Constant from each photoelectric / electrical light conversion unit 130a, 130b, ... 130n to both sides thereof in parallel to the transmission / reception optical paths 11a, 11b, ... 11n, 12a, 12b, ... 12n Installed at a distance (for example, 320 m) to extend the electrical signal converted through the photoelectric conversion units of the photoelectric / electric photoelectric conversion units 130a, 130b, ... 130n to a predetermined length to leak and radiate the reverse optical signal. Feed lines 13a, 13b, ... 13n which are received and provided as inputs to the all-optical conversion units of the photoelectric / electrical light conversion units 130a, 130b, ... 130n; And Yagi antennas 14a, 14b, ... 14n provided at the ends of each of the feed lines 13a, 13b, ... 13n.

The optical relay / transmitter 120 is configured to service a maximum of nine TRAUs 130, correspondingly to the transmission light paths 11a, 11b, ... 11n and the reception light path 12a. (12b, ... 12n) is composed of nine cores each consisting of nine core optical lines, one pair of transmission and reception lines each composed of a pair of the photoelectric / all-optical conversion unit (130a, 130b, ... 130n) Are respectively connected to the corresponding.

The pair of transmit / receive optical paths (11a and 12a, 11b and 12b,..., 11n and 12n: hereinafter referred to as 11 and 12) may all be the same length and be installed to penetrate the entire tunnel. In the example, the plurality of photoelectric / electric light conversion units 130a, 130b, ... 130n are installed at intervals of 700 m which are optimally determined within a range of about 600 to 800 m. And 12a are 700 m long from the inlet, and the second pair of optical paths 11b and 12b extend the length of each pair of transmit / receive optical paths 11 and 12 to each other, such as 1400 m from the inlet. The distance between the ends is set to be 700 m, and the photoelectric / electric conversion parts 130a, 130b, ... 130n are provided at the ends. Correspondingly, the feed lines 13a, 13b, ... 13n are 320 m, which are optimally determined within the range of about 270 to 370 m, respectively, from the photoelectric / optical conversion units 130a, 130b, ... 130n. By providing the length, it is preferable to install so that the space | interval space between the edge parts of adjacent feed lines 13a, 13b, etc. may be 60m in 30-90m range.

As described above, in the present embodiment, the installation interval between the photoelectric / electric light conversion units 130a, 130b, ... 130n and the length of the feed lines 13a, 13b, ... 13n are units of the feed line. It is set in consideration of the relation of gain of the Yagi antenna to the loss per length, and the feed line is used to have a power loss of 4dB to 7dB per 100m, and the Yagi antenna has a gain of 8 to 14dB. As described above, the installation intervals between the photoelectric / electrical light conversion units 130a, 130b, ... 130n and the lengths of the feed lines 13a, 13b, ... 13n are set as described above. Accordingly, the range may be variously changed and set in consideration of the relation of the gain of the causing antenna with respect to the loss per unit length of the feed line within the range without departing from the technical spirit of the present invention.

3 is a block diagram of a light distribution system for a tunnel according to another embodiment of the present invention, showing a high frequency type system, in which reference numeral 310 denotes a base station (BTS), and reference numeral 320 denotes the base station. Receives a high frequency signal of 310 and performs a automatic gain adjustment function via a wireless section, and indicates a high frequency unit (RF Unit) for transmitting a signal of a constant level to the optical splitting transmission module 321, reference numeral 321 denotes the RF The optical split power module 321 converts the electrical communication signal received from the unit 320 into an optical signal and distributes and transmits the electrical communication signal to a plurality of Tunnel Remote Antenna Units (TRAU) 330. The 330 may use an antenna ANT or a feed line LCX in a duplex manner as the TRAU 130 capable of serving in a tunnel.

When the high frequency type tunneling optical dispersion system according to the present invention as shown in FIG. 3 is applied to a tunnel, the RF unit 320 and the optical splitting transmission module 321 as optical relaying and transmitting means are directly connected to each other and the tunnel. Installed at the inlet, the plurality of TRAU 330 is distributed in the tunnel.

4 is a block diagram illustrating in detail the light distribution system for the tunnel of FIG. 3 according to another embodiment of the present invention.

4, a high frequency relay unit (RFU) 320 for relaying by communicating with the base station 310 via a wireless section; The forward high frequency signal received from the high frequency relay unit 320 is converted into an optical signal and divided into a plurality of optical signals, and the divided forward optical signals are each transmitted by one core transmission optical line 11a, 11b, ... 11n. Relay transmission through and receiving a reverse signal corresponding to the forward optical signal via a core of each of the received optical line (12a, 12b, ... 12n) and converts into an electrical signal to the high-frequency relay unit 320 An optical splitter transmitting unit 321 provided as an input of the; On the transmission optical lines (11a, 11b, ... 11n) and the receiving optical lines (12a, 12b, ... 12n) are connected to each other at a predetermined distance interval (for example, 700 m intervals), the respective optical paths Photoelectric / optical conversion unit 330a as the TRAU 330 of FIG. 3 for photoelectric / optical conversion of signals in forward and reverse directions through (11a, 11b, ... 11n) (12a, 12b, ... 12n) 330b, ... 330n); From each of the photoelectric / electrical light conversion units 330a, 330b, ... 330n, parallel to the transmission / reception optical paths 11a, 11b, ... 11n, 12a, 12b, ... 12n A predetermined distance (eg, 320 m) is installed to extend the electrical signal converted through the photoelectric conversion parts of the photoelectric / electric conversion parts 330a, 330b, ... A feed line (13a, 13b, ... 13n) for receiving a reverse signal and providing it as an input to the all-optical conversion portion of the photoelectric / electrical light conversion unit (330a, 330b, ... 330n); And Yagi antennas 14a, 14b, ... 14n provided at ends of the feed lines 13a, 13b, ... 13n.

The optical splitter transmitter 321 is configured to service a maximum of nine TRAUs 330, and correspondingly, the transmission optical paths 11a, 11b, ... 11n and the reception optical paths 12a, 12b, ... 12n) is composed of nine cores each consisting of nine core optical lines and one pair of transmitting / receiving lines each comprising a pair of photoelectric / electrical light converting units 330a, 330b, ... 330n Each is connected correspondingly.

The pair of transmit / receive optical paths (11a and 12a, 11b and 12b,..., 11n and 12n: hereinafter referred to as 11 and 12) may all be the same length and be installed to penetrate the entire tunnel. In the example, the plurality of photoelectric / electric light conversion units 330a, 330b, ... 330n are installed at intervals of 700 m which are optimally determined within a range of about 600 to 800 m. And 12a are 700 m long from the inlet, and the second pair of optical paths 11b and 12b extend the length of each pair of transmit / receive optical paths 11 and 12 to each other, such as 1400 m from the inlet. The distance between the ends is set to be 700m, and the photoelectric / electric conversion parts 330a, 330b, ... 330n are installed at the ends. Correspondingly, the feed lines 13a, 13b, ... 13n are 320 m, which are optimally determined within the range of about 270 to 370 m, respectively, from the photoelectric / optical conversion units 330a, 330b, ... 330n. By providing the length, it is preferable to install so that the space | interval space between the edge parts of adjacent feed lines 13a, 13b, etc. may be 60m in 30-90m range.

As such, in the present embodiment, the installation interval between the photoelectric / electrical light conversion units 330a, 330b, ... 330n and the length of the feed lines 13a, 13b, ... 13n are units of the corresponding feed line. It is set in consideration of the relation of gain of the Yagi antenna to the loss per length, and the feed line is used to have a power loss of 4dB to 7dB per 100m, and the Yagi antenna has a gain of 8 to 14dB. As described above, the installation intervals between the photoelectric / electrical light conversion units 330a, 330b, ... 330n and the lengths of the feed lines 13a, 13b, ... 13n are set as described above. Accordingly, the range may be variously changed and set in consideration of the relation of the gain of the causing antenna with respect to the loss per unit length of the feed line within the range without departing from the technical spirit of the present invention.

As described in detail above, according to the optical dispersion system for tunnels in a mobile communication network according to the present invention, a smooth communication linkage is made between a long tunnel inside and an external radio wave environment such as a railroad tunnel, thereby dramatically improving communication quality for a railroad tunnel. And economical coverage is built, of course, when applying the system of the present invention to the high-speed railway in the future, the effect of providing a good call quality and economy even in a long tunnel.

Claims (8)

A relay unit (MOS: Master Optic Shelf) which is directly connected to a base station, converts a forward communication signal transmitted from the base station into an optical signal, and also converts an optical signal of a reverse direction transmitted to the base station into a communication signal; Is connected through the optical means and the relay means, the forward optical signal received from the relay means through the optical line is divided into a plurality of optical signals, and the divided optical signal through the respective transmission light beam Optical transmission means (DHS: Donor Hub Shelf) for transmitting the optical signal in a reverse direction through each receiving optical path and providing the optical signal to the relay means through the optical path; And A plurality of photoelectric / optical conversion units connected to the transmission light path and the reception light path at a predetermined distance, and configured to photoelectrically or electro-optically convert optical signals in forward and reverse directions through the transmission light path or the reception light path; Installed on both sides of each of the photoelectric / optical converters at a predetermined distance in parallel to the transmission light path or the receiving light path, extending the electrical signal converted through the photoelectric conversion part of the photoelectric / electric light conversion part to a predetermined length and leaking radiation A feed line configured to receive the optical signal in a reverse direction and provide it as an input to an all-optical converting unit of the photoelectric / electrical converting unit; And a light scattering means (TRAU: Tunnel Remote Antenna Unit) for distributing the optical signal corresponding to the communication signal, having a yagi antenna provided at an end of each feed line. Light distribution system for tunnels. delete delete The method of claim 1, The optical transmission means is configured such that the divided optical signals are distributed and transmitted at regular intervals by mutually different transmission lengths of the plurality of divided optical signals, And the photoelectric / electric light conversion unit is provided at an end of a transmission path of each of the optical signals, and the photoelectric / electric light conversion units are arranged at a predetermined distance from each other. The method of claim 1, The feed line is extended to both sides of the photoelectric / all-optical conversion unit is installed in parallel to the light transmission path, each end between the adjacent feed line is distributed for tunnels in the mobile communication network, characterized in that spaced at a predetermined interval system. The method according to any one of claims 1, 4 and 5, The installation interval between the photoelectric / electric light conversion unit and the length of the feed line are set by the relationship between the gain of the causing antenna relative to the loss per unit length of the feed line, and the light distribution system for the tunnel in the mobile communication network. . The method of claim 6, The installation interval of the photoelectric / electric light conversion unit is 600 to 800 m, the length of the feed line is 270 to 370 m, and the distance between end portions of the feed line is 30 to 90 m. system. The method of claim 7, wherein The feed line has a power loss of 4 dB to 7 dB per 100 m, and the Yagi antenna has a gain of 8 to 14 dB.