System and method of monitoring base station signal

Abstract

According to one aspect of the present disclosure, a base station signal monitoring system is disclosed, comprising a plurality of optical transmission devices for transmitting a base station signal, a measuring device for measuring the base station signal according to a preset method, and a switching device connected to the plurality of optical transmission devices and the measuring device, and switching the connection of a plurality of input ports and a plurality of output ports so that a base station signal is transmitted from any one of the plurality of optical transmission devices to another of the plurality of optical transmission devices or to the measuring device.

Description

Technology Field

[0001] The present disclosure relates to a base station signal monitoring system and method. Background Technology

[0002] A fronthaul refers to the link connecting a digital data processing unit (e.g., Digital Unit (DU)) of a base station and a remote radio signal processing unit (e.g., Radio Unit (RU)) in a mobile communication wireless access network.

[0003] Existing active fronthaul devices based on Wavelength Division Multiplexing (WDM), used for data distribution in fronthaul, simply performed the role of transmitting signals coming from base station equipment (DU, RU, etc.) to other devices after performing Optical-Electrical-Optical (OEO) conversion and 3R (Reamplification, Retiming, Reshaping) processing. Therefore, in order to change the connection between the client-side signal and the WDM-side signal, an administrator must visit the site in person to unlock and change the Optical Jumper Code (OJC) connected to each device.

[0004] In addition, to measure or gauge base station signals being transmitted and received through base station equipment, an administrator must visit the site in person and connect a measuring device to the relevant equipment. For example, to measure base station signals transmitted and received through a base station antenna, the administrator must visit the site where the antenna is installed, form a tap on the cable connected to the antenna, install a splitter on the tap, and then connect the measuring instrument. Prior art literature

[0005] U.S. Patent Publication No. 2018 / 0234200 The problem to be solved

[0006] The present disclosure aims to provide a base station signal monitoring system and method capable of remotely monitoring base station signals without a visit by an administrator.

[0007] The technical problems that the technical concept of the present disclosure aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0008] According to one aspect of the present disclosure, a base station signal monitoring system is provided, comprising: a plurality of optical transmission devices for transmitting a base station signal; a measuring device for measuring the base station signal according to a preset method; and a switching device connected to the plurality of optical transmission devices and the measuring device, and switching the connection of a plurality of input ports and a plurality of output ports so that the base station signal is transmitted from any one of the plurality of optical transmission devices to another of the plurality of optical transmission devices or to the measuring device.

[0009] According to an exemplary embodiment, the switch device receives a base station signal transmission request from the measuring device and switches the connection between the plurality of input ports and the plurality of output ports to transmit at least a portion of the base station signal corresponding to the base station signal transmission request to the measuring device.

[0010] According to an exemplary embodiment, the switch device receives a base station signal transmission request from the measuring device and can duplicate at least a portion of the base station signal corresponding to the base station signal transmission request and transmit it to the measuring device.

[0011] According to an exemplary embodiment, the base station signal monitoring system may further include a server connected to the switch device and transmitting change information to the switch device for changing the connection state between the plurality of input ports and the plurality of output ports; and the switch device may control the connection between the plurality of input ports and the plurality of output ports in accordance with the change information.

[0012] According to another aspect of the present disclosure, a switch device is provided comprising: a plurality of input ports each connected to a plurality of optical transmission devices; a plurality of output ports each connected to any one of the plurality of optical transmission devices and a measuring device; a switch for switching the connection of the plurality of input ports and the plurality of output ports so that a base station signal is transmitted from any one of the plurality of optical transmission devices to another of the plurality of optical transmission devices or to the measuring device; and a switch controller for controlling the switch to correspond to preset connection information.

[0013] According to an exemplary embodiment, the switch device may further include a communication modem that receives a base station signal transmission request from the measuring device, and the switch controller may control the switch so that at least a portion of the base station signal corresponding to the base station signal transmission request is transmitted to the measuring device.

[0014] According to an exemplary embodiment, the switch device may further include a communication modem that receives a base station signal transmission request from the measuring device; and the switch controller may control at least one of the switch and the communication modem so as to duplicate at least a portion of a base station signal corresponding to the base station signal transmission request and transmit at least a portion of the duplicated base station signal to the measuring device.

[0015] According to an exemplary embodiment, the switch device may further include a communication modem that receives change information from a connected server for changing the connection state between the plurality of input ports and the plurality of output ports, and the switch controller may control the switch in accordance with the change information.

[0016] According to another aspect of the present disclosure, an optical transmission device is provided comprising: a plurality of signal processors each processing a plurality of base station signals according to a preset method; a plurality of laser modules each connected to the plurality of signal processors and each converting the plurality of base station signals output from the plurality of signal processors into optical signals; a switch that switches the connection between the plurality of signal processors and the plurality of laser modules so that each of the plurality of base station signals is input to a corresponding laser module among the plurality of laser modules; and a switch controller that controls the switch to correspond to preset connection information.

[0017] According to an exemplary embodiment, the optical transmission device may further include a communication modem that receives a base station signal transmission request from a connected measuring device; and the switch controller may control the switch so that at least a portion of the base station signal corresponding to the base station signal transmission request among the plurality of base station signals is transmitted to the measuring device.

[0018] According to an exemplary embodiment, the optical transmission device may further include a communication modem that receives a base station signal transmission request from a connected measuring device; and the switch controller may control at least one of the switch and the communication modem so as to duplicate at least a portion of the base station signal corresponding to the base station signal transmission request among the plurality of base station signals, and transmit at least a portion of the duplicated base station signal to the measuring device.

[0019] According to an exemplary embodiment, the optical transmission device may further include a communication modem that receives change information from a connected server for changing the connection state between the plurality of signal processors and the plurality of laser modules, and the switch controller may control the switch in accordance with the change information. Effects of the invention

[0020] According to the present disclosure, a base station signal monitoring system and method can be provided that allow for remote monitoring of base station signals without a visit by an administrator.

[0021] The effects obtainable by embodiments according to the technical concept of the present disclosure are not limited to the effects mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the technical concept of the present disclosure belongs from the description below. Brief explanation of the drawing

[0022] A brief description of each drawing is provided to help to better understand the drawings cited in the detailed description of this invention. FIG. 1 is a configuration diagram of a base station signal monitoring system according to one embodiment of the present disclosure. FIG. 2 is a block diagram of an optical transmission device according to one embodiment of the present disclosure. FIG. 3 is a block diagram of a switch device according to one embodiment of the present disclosure. FIG. 4 is a configuration diagram of a base station signal monitoring system according to another embodiment of the present disclosure. FIG. 5 is a block diagram of an optical transmission device according to another embodiment of the present disclosure. Specific details for implementing the invention

[0023] The technical concept of the present disclosure is subject to various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the technical concept of the present disclosure to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the scope of the technical concept of the present disclosure.

[0024] In describing the technical concept of the present disclosure, detailed descriptions of related prior art are omitted if it is determined that such descriptions may unnecessarily obscure the essence of the technical concept of the present disclosure. Furthermore, numbers used in the description of the present invention (e.g., First, Second, etc.) are merely identification symbols to distinguish one component from another.

[0025] In addition, when a component is described in this document as being "connected" or "joined" with another component, it should be understood that the component may be directly connected or joined to the other component, but unless otherwise specifically stated, it may also be connected or joined through another component in between.

[0026] Additionally, terms such as “~part,” “~device,” and “~part” described herein refer to a unit that processes at least one function or operation, and this may be implemented as hardware such as a processor, microprocessor, microcontroller, CPU (Central Processing Unit), GPU (Graphics Processing Unit), APU (Accelerate Processor Unit), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), software, or a combination of hardware and software.

[0027] Furthermore, it is intended to clarify that the classification of the components in this document is merely based on the primary function each component is responsible for. That is, two or more components described below may be combined into a single component, or a single component may be divided into two or more components based on more subdivided functions. Additionally, each component described below may additionally perform some or all of the functions of other components in addition to its own primary function, and it goes without saying that some of the primary functions of each component may be exclusively performed by other components.

[0028] Hereinafter, various embodiments according to the technical concept of the present disclosure will be described in detail in turn.

[0030] FIG. 1 is a configuration diagram of a base station signal monitoring system according to one embodiment of the present disclosure, FIG. 2 is a block configuration diagram of an optical transmission device according to one embodiment of the present disclosure, and FIG. 3 is a block configuration diagram of a switch device according to one embodiment of the present disclosure.

[0031] Referring to FIG. 1, a base station signal monitoring system (100) according to one embodiment of the present disclosure may include n Central Office Terminals (COTs) (110-1 to 110-n), n Remote Terminals (RTs) (120-1 to 120-n), a switch device (130), a measuring device (140), and a server (150) (where n is a natural number). FIG. 1 illustrates an embodiment in which the number of COTs and RTs is the same and one COT and one RT are connected to each other, but the technical concept of the present disclosure is not limited thereto. The number of COTs and RTs, and the structure of their connection to each other, may vary.

[0032] Each of the n COTs (110-1 to 110-n) can be connected to at least one of the n RTs (120-1 to 120-n). The interconnected COTs and RTs can be connected via optical cables and can form an optical transmission network through interconnection. Among the interconnected COTs and RTs, the COT can be connected to a part that performs digital processing of a base station in the fronthaul segment of a radio access network architecture, for example, at least one Digital Unit (DU) or BaseBand Unit (BBU), and the RT can be connected to a part that performs radio processing of the base station, for example, at least one Radio Unit (RU) or Remote Radio Head (RRH). However, this is not limited thereto, and among the interconnected COTs and RTs, the COT may be connected to at least one macro cell RU, and the RT may be connected to at least one small cell RU. Depending on the various fronthall topologies of the wireless access network architecture, the connection targets and interconnection structures of the COT and RT, respectively, can be varied in many ways.

[0033] The switch device (130) can be connected to n COTs (110-1 to 110-n). Each of the switch device (130) and the n COTs (110-1 to 110-n) can be connected by an optical cable.

[0034] The switch device (130), the measuring device (140), and the server (150) can be connected to a network (170). The network (170) can be any type of communication network capable of connecting the switch device (130), the measuring device (140), and the server (150). Accordingly, the network (170) can be one or more of the Internet, an intranet, an optical communication network, and a mobile network.

[0035] Meanwhile, the base station monitoring system (100) illustrated in FIG. 1 illustrates an application example to an optical transport network, which is a sub-network constituting the fronthaul segment of a wireless access network architecture, but the technical concept of the present disclosure is not limited thereto. It is obvious that the technical concept of the present disclosure can be applied to the midhaul and backhaul segments of a wireless access network architecture, and furthermore, to optical transport networks such as FTTx solutions and in-building solutions.

[0036] Hereinafter, the operation of each component of the base station signal monitoring system (100) according to one embodiment of the present disclosure will be described in more detail.

[0037] First, a COT (110-1 to 110-n) (hereinafter collectively referred to as '110') may be a device that multiplexes base station signals and transmits them to one or more connected RTs (one or more of 120-1 to 120-n). For example, the COT (110) may receive m base station signals (where m is a natural number) from a DU (not shown) and convert them into WDM signals. Additionally, the COT (110) may transmit the WDM signals to one or more connected RTs (one or more of 120-1 to 120-n) via an optical cable. That is, the COT (110) may receive m base station signals and convert them into optical signals of different wavelengths, and transmit the optical signals to one or more RTs (one or more of 120-1 to 120-n). Meanwhile, the above base station signal may be a baseband signal that follows fronthaul link standards such as CPRI (Common Public Radio Interface), OBSAI (Open Base Station Architecture Initiative), and ORI (Open Radio Equipment Interface).

[0038] COT (110) can transmit m base station signals to the switch device (130).

[0039] Referring further to FIG. 2, a COT (110) according to one embodiment of the present disclosure may include m signal processors (210-1 to 210-m), m laser modules (220-1 to 220-m), and a multiplexer (230).

[0040] Each of the m signal processors (hereinafter collectively referred to as 210) can process a base station signal received from a DU (not shown). The signal processor (210) can receive the base station signal, convert it to serial and parallel, and then output it, and may include known configurations such as an SFP (Small Form Factor Pluggable), a serializer, an FPGA, a serial / parallelizer (SerDes), etc.

[0041] Each of the m laser modules (hereinafter collectively referred to as 220) can generate a base station signal output from the signal processor (210) into an optical signal of a corresponding wavelength. For example, the laser module (220) can generate the base station signal into an optical signal of a first wavelength ( Optical signal of wavelength ) to m ( Since it can output ), it may include known configurations such as laser diodes, laser controllers, etc.

[0042] The optical signals generated by m laser modules (220) can be multiplexed through a multiplexer (230) and transmitted to at least one of RTs (120-1 to 120-n).

[0043] Meanwhile, base station signals output from each signal processor (210) may be duplicated or branched and transmitted to the switch device (130). For example, signals output from each signal processor (210) may be tapped via T-Drop and transmitted to the switch device (130).

[0044] In FIG. 2, the case was described assuming that base station signals output from each signal processor (210) (i.e., base station signals before being input to each laser module (220)) are transmitted to the switch device (130), but base station signals output from each laser module (220) (i.e., optical signals) may also be transmitted to the switch device (130).

[0045] Referring again to FIG. 1, RT (120-1 to 120-n) (hereinafter collectively referred to as '120') is a device located on the cell site side. RT (120) is connected to COT (110) and can transmit base station signals received from COT (110) to RU (not shown).

[0046] The switch device (130) can switch base station signals received from n connected COTs (110).

[0047] Referring further to FIG. 3, the switch device (130) may include an input port (310), an output port (320), a switch (330), a communication modem (340), and a switch controller (350).

[0048] The input port (310) may be configured for connection with one or more optical transmission devices (e.g., COT (110), etc.). The input port (310) may receive base station signals from the connected optical transmission device. For example, the input port (310) may be a communication port to which an optical cable can be connected.

[0049] The output port (320) may be configured for connection to one or more optical transmission devices (e.g., COT (110), etc.) and to a measurement device (140) and / or a server (150) via a network (170). The output port (320) may output base station signals received through the input port (310) to the connected optical transmission device and transmit them to the measurement device (140) and / or the server (150) via the network (170). For example, the output port (320) may also be a communication port to which an optical cable can be connected.

[0050] The switch (330) may be configured to switch the connection between the input port (310) and the output port (320). The switch (330) may perform a switching operation under the control of the switch controller (350). The input port (310) and the output port (320) may be connected in accordance with pre-stored connection information. The connection information may be information regarding the connection relationship between the input port (310) and the output port (320), and may be information stored in a pre-set storage space (not shown). For example, assuming that the input port (310) and the output port (320) are each composed of three ports, the connection information may include relevant information such that the first input port is connected to the first output port, the second input port is connected to the second output port, and the third input port is connected to the third output port. In the above example, the case was described assuming that the number of input ports (310) and output ports (320) are the same, but it is obvious that the number of ports may be different.

[0051] Since the switch (330) can be applied regardless of its type as long as it is a switch capable of resetting the connection between the input port (310) and the output port (320), not only a crosspoint switch but also a packet switch can be applied.

[0052] The communication modem (340) is configured to be connected to the network (170), and the switch device (130) can transmit and receive data to and from the measurement device (140) and / or server (150) via the communication modem (340).

[0053] The switch controller (350) may be a configuration that controls the overall operation of the switch device (130). The switch controller (350) can control the connection of the input port (310) and the output port (320) to be changed. For example, if an administrator operates the server (150) to transmit information (hereinafter referred to as "change information") for changing the connection status of the input port (310) and the output port (320), the connection status can be changed accordingly. More specifically, the server (150) can transmit the generated change information to the communication modem (340) via the network (170), and the communication modem (340) can output the change information to the switch controller (350). The switch controller (350) can analyze the change information and, based on the analysis result, control the switch (330) to change the connection of the input port (310) and the output port (320) to correspond to the change information. For example, the change information may include information such that, unlike the connection relationships between the three input and output ports that are pre-set in the example described above, the first input port is connected to the third output port and the third input port is connected to the first output port.

[0054] The switch device (130) can detect a base station signal corresponding to a request from an administrator or the like among the received base station signals and transmit it to a measuring device (140) and / or a server (150).

[0055] An administrator, etc., may transmit information requesting the transmission of one of the m base station signals input into the switch device (130) (hereinafter referred to as "base station signal transmission request") to a communication modem (340). The base station signal transmission request may be generated by the measurement device (140) through the operation of the administrator's measurement device (140) or generated by the server (150) through the operation of the administrator's server (150) and then transmitted to the communication modem (340). When the communication modem (340) receives the base station signal transmission request, it may output it to the switch controller (350).

[0056] When a base station signal transmission request is received, the switch controller (350) can cause part or all of the base station signal corresponding to the base station signal transmission request to be transmitted to the measurement device (140) and / or server (150).

[0057] It is assumed that the base station signal corresponding to the base station signal transmission request is the first base station signal. In this case, the switch controller (350) can control the switch (330) so that the first base station signal input to the switch (330) is transmitted to the measuring device (140). Depending on the control of the switch controller (350), the switch (330) may be able to connect the input port (310) into which the first base station signal is input and the output port (320) connected to the measuring device (140).

[0058] Alternatively, when a base station signal transmission request is received, the switch controller (350) can duplicate a base station signal corresponding to the base station signal transmission request and transmit the duplicated base station signal to a measuring device (140) and / or a server (150).

[0059] It is assumed that the base station signal corresponding to the base station signal transmission request is the first base station signal. In this case, the switch controller (350) can control the switch (330) so that the first base station signal input to the switch (330) is duplicated at least partially. In this case, the switch (330) may include a configuration capable of duplicating at least a portion of the input signal. Additionally, under the control of the switch controller (350), the switch (330) may output the duplicated first base station signal to an output port (320) connected to the measurement device (140).

[0060] According to an embodiment, the switch controller (350) can control the switch (330) so that the switch (330) outputs a duplicated first base station signal to the communication modem (340), and can control the communication modem (340) so that the communication modem (340) transmits the duplicated first base station signal to the measurement device (140) and / or server (150).

[0061] Referring again to FIG. 1, the measuring device (140) can receive a base station signal (i.e., a part / all or a duplicate signal of the base station signal transmitted from the switch device (130) in response to a base station signal transmission request) from the switch device (130). The measuring device (140) can measure the received base station signal and determine the quality of the base station signal. Since the configuration and operation of the measuring device (140) measuring the base station signal are obvious to those skilled in the art, a detailed description thereof is omitted.

[0062] The server (150) can manage / control and monitor the measurement device (140) connected via the network (170). For example, the server (150) can transmit a base station signal transmission request to the measurement device (140) so that the measurement device (140) can receive and measure the base station signal. As another example, the server (150) can receive information regarding the base station signal measurement results from the measurement device (140) and manage it. That is, the server (150) can receive the measurement results from the measurement device (140) and determine whether the base station signal is being transmitted and received normally.

[0063] The server (150) may directly receive a base station signal from a switch device (130) connected via a network (170) and measure the received base station signal to determine whether normal transmission and reception are possible.

[0064] Additionally, the server (150) can generate change information corresponding to the administrator's operation. The server (150) can transmit the generated change information to the switch device (130) via the network (170) to control the switch device (130) to change the connection between the input port (310) and the output port (320).

[0065] FIG. 4 is a configuration diagram of a base station signal monitoring system according to another embodiment of the present disclosure, and FIG. 5 is a block configuration diagram of an optical transmission device according to another embodiment of the present disclosure.

[0066] The base station signal monitoring system (400) according to another embodiment of the present disclosure illustrated in FIG. 4 differs from the base station signal monitoring system (100) illustrated in FIG. 1 in that it does not include a switch device (130). That is, the base station signal monitoring system (400) according to another embodiment of the present disclosure does not separately include a switch device (130), and includes components for performing the function of a switch device (130) within each COT (410-1 to 410-n) (hereinafter collectively referred to as '410').

[0067] Referring to FIG. 5, the COT (410) may include a COT switch (510), a COT communication modem (520), and a COT switch controller (530). The COT switch (510), the COT communication modem (520), and the COT switch controller (530) may have functions similar to the switch (330), the communication modem (340), and the switch controller (350) of the switch device (130) of FIG. 3.

[0068] That is, the COT switch (510) can connect m signal processors (210-1 to 210-m) and m laser modules (220-1 to 220-m) in accordance with connection information pre-stored in a provided storage space (not shown). The connection information in the example may be information about the connection relationship between m signal processors (210-1 to 210-m) and m laser modules (220-1 to 220-m), and may be information stored in a pre-set storage space (not shown). The connection information may include relevant information such that the first signal processor (210-1) is connected to the first laser module (220-1), the second signal processor (210-2) is connected to the second laser module (220-2), and the third signal processor (210-3) is connected to the third laser module (220-3). In addition, similar to the above, connection information may be changed by subsequent change information.

[0069] Additionally, the COT communication modem (520) is configured to be connected to the network (170), and the COT switch device (510) can receive data such as change information from the measurement device (140) and / or server (150) via the COT communication modem (520), and can transmit base station signals, etc. to the measurement device (140) and / or server (150).

[0070] The COT switch controller (530) can control the connection of m signal processors (210-1 to 210-m) and m laser modules (220-1 to 220-m) to be changed. Since the operation may be the same or similar as the method described for change information with reference to FIG. 3, a detailed description is omitted.

[0071] Additionally, the measuring device (140) can generate information requesting the transmission of one of the m base station signals input into the COT (110) (hereinafter referred to as 'base station signal transmission request') and transmit it to the COT communication modem (520). When the base station signal transmission request is received, the COT communication modem (520) can output it to the COT switch controller (530).

[0072] The COT switch controller (530) can cause part or all of the base station signal corresponding to the base station signal transmission request to be transmitted to the measuring device (140) when a base station signal transmission request is received.

[0073] It is assumed that the base station signal corresponding to the base station signal transmission request is the first base station signal (i.e., the base station signal output from the first signal processor (210-1)). In this case, the COT switch controller (530) can control the COT switch (510) so that the first base station signal input to the COT switch (510) is transmitted to the measurement device (140).

[0074] The COT switch (510) can duplicate the first base station signal under the control of the COT switch controller (530) and output it to the COT communication modem (520), and the COT communication modem (520) can transmit the first base station signal to the measuring device (140).

[0075] Alternatively, base station signals input to the COT switch (510) may be signals that are output from each signal processor (210-1 to 210-m) and then partially coupled and input to the COT switch (510), and the COT switch (510) may be configured to transmit a base station signal corresponding to a base station signal transmission request to the measurement device (140) under the control of the COT switch controller (530).

[0076] As described above, a base station signal monitoring system (100, 400) according to one embodiment of the present disclosure includes a switch device (130, 510) capable of receiving and switching base station signals from an optical transmission device (e.g., COT, etc.), and a measuring device (140) can remotely receive base station signals from an optical transmission device (110, 410, etc.) through the switch device (130, 510) and analyze the quality of the signal, etc. Accordingly, according to the present disclosure, base station signals can be monitored remotely without a visit by an administrator.

[0078] Although the foregoing has been described with reference to preferred embodiments of the present disclosure, those skilled in the art will understand that various modifications and changes can be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the following claims. Explanation of the symbols

[0079] 100, 400: Base station signal monitoring system 110, 410: Central Office Terminal (COT) 120: RT(Remote Terminal) 130: Switch device 140: Measuring device 150: Server

Claims

Claim 1 A base station signal monitoring system comprising: a plurality of optical transmission devices for transmitting a base station signal; a measuring device for measuring the base station signal according to a preset method; and a switching device connected to the plurality of optical transmission devices and the measuring device, and switching the connection of a plurality of input ports and a plurality of output ports so that the base station signal is transmitted from any one of the plurality of optical transmission devices to another of the plurality of optical transmission devices or to the measuring device; wherein each of the plurality of optical transmission devices comprises: a signal processor for processing the base station signal according to a preset method; and a laser module connected to the signal processor and converting the base station signal output from the signal processor into an optical signal; and wherein the switching device is connected between the signal processor and the laser module. Claim 2 A base station signal monitoring system according to claim 1, wherein the switch device receives a base station signal transmission request from the measuring device and switches the connection between the plurality of input ports and the plurality of output ports to transmit at least a portion of the base station signal corresponding to the base station signal transmission request to the measuring device. Claim 3 A base station signal monitoring system according to claim 1, wherein the switch device receives a base station signal transmission request from the measuring device and duplicates at least a portion of a base station signal corresponding to the base station signal transmission request and transmits it to the measuring device. Claim 4 A base station signal monitoring system according to claim 1, further comprising: a server connected to the switch device and transmitting change information to the switch device for changing the connection state between the plurality of input ports and the plurality of output ports, wherein the switch device controls the connection between the plurality of input ports and the plurality of output ports in accordance with the change information. Claim 5 A switch device comprising: a plurality of input ports each connected to a plurality of optical transmission devices; a plurality of output ports each connected to either one of the plurality of optical transmission devices or a measuring device; a switch for switching the connection between the plurality of input ports and the plurality of output ports so that a base station signal is transmitted from any one of the plurality of optical transmission devices to another of the plurality of optical transmission devices or to the measuring device; and a switch controller for controlling the switch to correspond to preset connection information, wherein the switch device is connected between a signal processor included in each of the plurality of optical transmission devices and a laser module. Claim 6 In claim 5, the device further comprises a communication modem that receives a base station signal transmission request from the measuring device; wherein the switch controller controls the switch so that at least a portion of the base station signal corresponding to the base station signal transmission request is transmitted to the measuring device. Claim 7 A switch device according to claim 5, further comprising a communication modem that receives a base station signal transmission request from the measuring device, wherein the switch controller duplicates at least a portion of a base station signal corresponding to the base station signal transmission request and controls at least one of the switch and the communication modem so that at least a portion of the duplicated base station signal is transmitted to the measuring device. Claim 8 In claim 5, the switch device further comprises a communication modem that receives change information from a connected server for changing the connection state between the plurality of input ports and the plurality of output ports, wherein the switch controller controls the switch in accordance with the change information. Claim 9 An optical transmission device comprising: a plurality of signal processors that process a plurality of base station signals according to a preset method; a plurality of laser modules each connected to the plurality of signal processors and each converting the plurality of base station signals output from the plurality of signal processors into optical signals; a switch that switches the connection between the plurality of signal processors and the plurality of laser modules so that each of the plurality of base station signals is input to a corresponding laser module among the plurality of laser modules; a communication modem that receives a base station signal transmission request from a connected measuring device; and a switch controller that controls the switch to transmit a base station signal from any one of the plurality of signal processors to the measuring device in response to the base station signal transmission request. Claim 10 delete Claim 11 An optical transmission device according to claim 9, wherein the switch controller duplicates at least a portion of a base station signal corresponding to a base station signal transmission request among the plurality of base station signals, and controls at least one of the switch and the communication modem so that at least a portion of the duplicated base station signal is transmitted to the measuring device. Claim 12 An optical transmission device according to claim 9, wherein the communication modem receives change information from a connected server to change the connection state between the plurality of signal processors and the plurality of laser modules, and the switch controller controls the switch in accordance with the change information.

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