KR101708563B1 - Signal dispersion apparatus using utp cable and signal dispersion method - Google Patents

Abstract

The present invention discloses an RF dispersing apparatus for converting an RF unit of a wireless communication apparatus using an FDD scheme into a zero IF signal and an IF signal through various cables (UTP, FTP, and STP cables) and distributing the signals.
The present invention can be used in any wireless communication system capable of distributing RF signals such as a wireless backhaul transmission apparatus, a base station, and a repeater.

Description

Technical Field [0001] The present invention relates to a signal distributing apparatus and a signal distributing method using a UTP cable,

In a wireless communication apparatus using an FDD method, a Zero IF (Analog IQ) signal or an IF signal, which is a type of interlocking signal between a baseband modem and a radio frequency part (RF part), is distributed and transmitted through a UTP cable, The present invention relates to a signal distributing apparatus using a UTP cable and a signal distributing method for distributing a plurality of parts.

In addition, the present invention can include a method and system design method for expanding indoor or outdoor coverage in a mobile communication service, and a method for providing an Internet service at the same time.

The present invention minimizes interference effects and improves service quality by replacing a method of servicing a plurality of small base stations by extending RF of various wireless communication base stations and repeaters using an FDD scheme such as a wireless backhaul system, LTE, and WCDMA In addition, by using UTP cable dedicated for Internet service, it is possible to provide a method of reducing facility cost and a mobile communication service and an internet service at the same time by using an RF dispersion method transmitted through an existing coaxial cable.

Conventionally, in order to construct an indoor wireless communication service network that requires a wide service area while a large number of users exist as a large building, a DU (donor unit) unit of a base station or a repeater is concentratedly installed in a certain place, And a service area extension scheme using a small base station.

The conventional RF dispersion type apparatus distributes and transmits wireless RF signals and IF signals through a coaxial cable or converts RF signals into optical signals and distributes the signals through an optical cable. In such a conventional apparatus, when the RF signal is transmitted through the coaxial cable, the higher the frequency, the larger the transmission loss of the coaxial cable may be, and the RF signal is converted into a lower frequency to transmit the RF signal. Alternatively, a conventional apparatus can provide a service by connecting a repeater or a plurality of antennas using a low-loss coaxial cable (feeder) with low loss even at high frequencies.

However, this has made it difficult and limited in the conventional apparatus to use complicated and expensive repeaters and expensive coaxial cables.

In addition, while the conventional apparatus can transmit a large number of RF signals simultaneously through a relatively easy-to-install optical cable when transmitting an RF signal through an optical cable, it has a disadvantage in that an expensive production cost is required.

Meanwhile, according to a method of extending a service area using a small base station (e.g., LTE Femto base station), a conventional apparatus does not simply distribute only an RF signal, but uses a plurality of base stations having independent cell regions to transmit an RF signal The service quality may be degraded due to frequent hand overs occurring due to the location of a plurality of base stations in a narrow space and an interference problem due to signal overlapping.

In addition, an in-building service device using RF dispersion of mobile communication signals such as LTE does not use an Internet backhaul unlike a small base station such as an LTE Femto base station. Therefore, when such a distributed device is used at home or office, And the like.

The present invention relates to a method and system for distributedly arranging a plurality of RF parts by dispersively transmitting a Zero IF (Analog IQ) signal or an IF signal in the form of interlocking signals between a baseband modem and an RF part in a wireless communication apparatus using an FDD scheme, And to provide the above objects.

Another object of the present invention is to propose a method for expanding indoor or outdoor coverage of a mobile communication service, a method for designing a system, and a method for providing an Internet service at the same time.

In addition, the present invention minimizes the influence of interference by replacing a method of servicing a plurality of small base stations by extending the RF of various wireless communication base stations and repeaters using TDD, such as a wireless backhaul system, LTE, and WCDMA, And UTP cable dedicated to Internet service is used to distribute the RF distributed through the existing coaxial cable, thereby providing facilities for convenience, cost reduction, mobile communication service and internet service at the same time.

The present invention also relates to a method of separating and transmitting a Zero IF signal and an IF signal, which are signal transmission types between a modem baseband signal processing unit and an RF part of a communication device, into a differential signal and a reference clock for frequency conversion, And an internet signal for internet service at the same time through a low-cost data cable.

The signal distributing apparatus using a UTP cable according to an embodiment of the present invention includes an RU (Remote Unit) distributed in a service area, an RU (Remote Unit) allocated using a Frequency Division Duplex (FDD) A conversion unit for converting an RF signal received from the wireless network into an IF signal, and an IF unit for separating the IF signal by an RU according to a different allocation of the allocated frequency through a UTP cable (unshielded twisted pair cable) And a transmitter for transmitting the IF signal to the RU while maintaining the transmission of the Internet signal by the UTP cable.

According to another aspect of the present invention, there is provided a method of distributing signals using a UTP cable, the method comprising: allocating different frequencies to each other by using an FDD scheme in each of RUs distributed in a service area; Converting the RF signal into an IF signal and transmitting the IF signal separated by RU to the corresponding RU by different allocation of the allocated frequency through a UTP cable, And transmitting the IF signal to the RU while maintaining transmission of the IF signal.

The present invention provides the following advantages compared to the prior art.

The present invention can be applied to all radio communication apparatuses requiring RF signal transmission such as a repeater and a mobile communication base station and can distribute RF through a UTP cable which is easy to install in the form of an IF signal or a Zero IF signal, This is possible.

In addition, the present invention can simultaneously provide a mobile communication service and an Internet service by simultaneously transmitting a mobile communication signal and an Internet signal that have not been provided previously.

Further, since the present invention can use a grounded UTP cable, the application field has a wide variety of characteristics.

According to an embodiment of the present invention, a method for transmitting an RF signal using a UTP cable that provides an Internet service can be provided instead of a coaxial cable, which is difficult to install and expensive in a service area expansion method using RF dispersion have.

Also, according to the present invention, a method of converting and transmitting an RF signal, which can be transmitted through a UTP cable, and a method of providing an Internet service at the same time can be presented.

In addition, according to the present invention, a method of minimizing mutual interference occurring when transmitting an RF signal using a data cable that is not subjected to a shielded processing can be provided to secure service quality.

In addition, according to the present invention, there is a problem that a large number of RF dispersing devices are connected and a reduction in the service area due to an increase in the number of reverse (Rx) noise signals is accompanied by a large number of RF dispersing devices connected to a small number of base stations Another solution to the problem of capacity reduction is presented.

In addition, according to the present invention, unlike the existing system, the cost of facility investment can be reduced at the same time by suggesting a low-cost apparatus manufacturing method with a minimum hardware configuration.

Further, the present invention can be applied to various wireless communication base stations and repeaters such as WCDMA, LTE, wireless backhaul system, and TV signal transmission apparatus, thereby enabling to provide a wireless communication service with excellent performance while reducing the cost, While simultaneously providing the Internet service in one device.

1 is a diagram illustrating an internal configuration of a signal distributor according to an embodiment of the present invention.
2 is a view for explaining an example of a construction of an indoor service network that simultaneously provides a mobile communication service and an internet service using RF dispersion in a mobile communication system using the FDD scheme.
3 is a diagram for explaining the arrangement of an IF frequency band for RF dispersion and IF frequency transmission for each Pin when a UTP cable is used.
4 is a diagram showing the structure of DU.
5 is a diagram showing a structure of an RF module inside DU.
6 is a diagram showing a structure of a UTP distributor in a DU.
7 is a diagram showing a structure of an RU.
8 is a diagram showing the structure of the RF module in the RU.
9 is a flowchart illustrating a procedure of a signal distribution method according to an embodiment of the present invention.

Hereinafter, an apparatus and method for updating an application program according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

1 is a diagram illustrating an internal configuration of a signal distributor according to an embodiment of the present invention.

Referring to FIG. 1, a signal distributor 100 using a UTP cable may include an identifying unit 110, an assigning unit 120, a converting unit 90, and a transmitting unit 140. In addition, according to the embodiment, the signal distributing apparatus 100 can be configured by adding the identifying unit 150 and the distributing unit 160, respectively.

First, the allocation unit 120 allocates different frequencies to each other using RUs (Remote Units) distributed in a service area using a Frequency Division Duplex (FDD) scheme.

In the frequency allocation of the allocation unit 120, the number of RUs can be a reference.

For this, the confirmation unit 110 can confirm the number of RUs distributed in the service area. That is, the verification unit 110 can perform a function of confirming the number of RUs as a destination to which an IF signal to be described later is transmitted.

The assigning unit 120 may assign n (n is a natural number) frequencies corresponding to the identified number to each of the RUs. That is, the allocating unit 120 may perform a function of dividing a plurality of frequencies in proportion to the number of RUs, and then allocating the respective frequencies to individual RUs. As an example, the allocation unit 120 may allocate different frequencies to the RUs using the FDD scheme.

For example, when the number of RUs is 4 (n = 4), the assigning unit 120 assigns a frequency A (15 to 35 MHz), a frequency B (35 to 55 MHz), and a frequency C (55 to 75 MHz) and frequency D (75 to 95 MHz) can be allocated to each of the four RUs.

In this case, when the RF signal is received from different types of wireless communication devices, the allocation unit 120 may allocate a frequency that is further divided for each wireless communication device to each of the RUs. For example, when the first RF signal of the indoor wireless communication apparatus and the second RF signal of the outdoor wireless communication apparatus are received, the allocating unit 120 allocates the frequency A (15 to 35 MHz), the frequency B (115 to 135 MHz) and the frequency B '(95 to 155 MHz) are allocated to the second RF signal, while the frequencies A' (115 to 135 MHz) and the frequency B '(95 to 155 MHz) , A frequency C '(155 to 175 MHz), and a frequency D' (175 to 195 MHz) are allocated to each of the four RUs.

The conversion unit 90 converts the RF signal received from the wireless network into an IF (Intermediate Frequency) signal. That is, the conversion unit 90 converts the RF signal received by radio into an IF signal so as to be transmitted using the wired infrastructure provided in an area (for example, a vertical building) where the RUs are distributedly arranged .

For example, the converting unit 90 converts a zero IF signal, which is a type of interlocking signal between a baseband modem in a wireless communication device receiving the RF signal and an RF unit that processes the RF signal, As shown in Fig.

The transmitting unit 140 may transmit the IF signal, which is differentiated for each RU, to the corresponding RU by a different allocation of the allocated frequency through a UTP cable (Unshielded Twisted Pair cable). That is, the transmitting unit 140 can transmit the IF signal to the corresponding RU using the allocated frequency through the UTP cable.

In particular, the transmitting unit 140 can transmit the IF signal to the RU while maintaining the transmission of the Internet signal by the UTP cable. Accordingly, the transmitter 120 applies the RF extension scheme of the wireless communication base station and the repeater using the FDD scheme, thereby making it possible to construct a facility that is easy to install and inexpensive, and can continuously provide the Internet service.

Here, the mutual RUs may be connected by various cables for exchanging internet signals and data communication, and the transmitting unit 140 may transmit IF signals to RUs via the wired cables.

For example, the transmitting unit 140 transmits the IF signal to the RU # 1 using the frequency A (15 to 35 MHz) and the frequency B (35 to 55 MHz) through the UTP cable , The IF signal can be transmitted to the RU # 2.

That is, the transmitting unit 140 can support the independent signal transmission without interfering with other RUs by transmitting the IF signal in consideration of the communication infrastructure environment surrounding the RU.

In addition to the IF signal, the transmitter 140 may transmit a reference clock for frequency synchronization in the corresponding RU and a power source for activating the corresponding RU through the UTP cable. Accordingly, the transmission unit 140 can designate and activate a desired specific RU among a plurality of distributed RUs, and can support a synchronization operation for transmitting a stable signal in an activated RU.

The transmitting unit 140 performs at least one of impedance matching with the RU, gain and impedance equalizer application, resonance prevention, differential transmission, and a PLL (phase locked loop) reference clock, To the corresponding RU. That is, the transmitting unit 140 can perform the pre-interfacing operation in order to stably transmit the IF signal to each RU, thereby minimizing signal loss due to signal dispersion.

In addition, the transmission unit 140 may transmit power for starting to the new RU via the RU in conjunction with the expansion of the service area.

According to the embodiment, the signal distributing apparatus 100 may further include an identifying unit 150. [

The identifying unit 150 is located outside the service area, but identifies a new RU connected to the RU by the UTP cable.

The transmitting unit 140 may transmit the IF signal to the new RU using the frequency allocated by the allocating unit 120 to extend the service area.

For example, when the RU # 5 is to be additionally allocated to the basement layer that was not included in the service area, the allocation unit 120 newly allocates the frequency E (95 to 115 MHz) for the newly allocated RU # 5 And the transmitting unit 140 transmits the IF signal and power to the RU # 5 through the UTP cable to which the RU # 5 is connected using the frequency E (95 to 115 MHz) And the service area to the basement where the RU # 5 is located.

Further, according to another embodiment, the signal distributor 100 may further include a distributor 160. [ The distribution unit 160 performs connection to the UTP cable. In other words, the distribution unit 160 recognizes the UTP cable in the service area and connects the UTP cable to the RTP, thereby creating an environment in which the RF signals ultimately routed to the wireless network are distributedly distributed to a plurality of RUs distributed in the service area can do.

As described above, according to an embodiment of the present invention, the number of distributed RUs is confirmed, a frequency is assigned to each RU according to the identified number, and an RF signal received from the wireless network is converted into an IF signal ), And the IF signal (or the Zero IF signal) is transmitted to each RU through the UTP cable using the allocated frequency, so that the service area inside or outside the building can be expanded.

According to an embodiment of the present invention, an IF signal (or a Zero IF signal) in the form of signal transmission between a modem baseband signal processing unit of a communication device and an RF unit is separately transmitted to each RU using a differential IF signal At this time, a reference clock for frequency conversion and a power source are simultaneously transmitted through a low-cost data cable, so that a radio backhaul transmission device, a radio communication base station, and a repeater using an FDD (Frequency Division Duplex) Can be extended.

2 to 8, a signal distributing apparatus using a UTP cable according to an embodiment of the present invention will be described as a donor unit (DU).

2 is a view for explaining an example of a construction of an indoor service network that simultaneously provides a mobile communication service and an internet service using RF dispersion in a mobile communication system using the FDD scheme.

2 shows a network configuration for providing a mobile communication indoor service and an Internet simultaneous service using RF dispersion in a mobile communication system using the FDD scheme.

RF dispersion can refer to a system in which a mobile communication apparatus using an FDD scheme is installed in a certain place and an RF unit that directly operates in cooperation with the terminal is installed in various places to expand the service area.

In the conventional RF dispersion, a method of disposing a digital part of a base station at a predetermined place, a method of dispersing and arranging RF parts by using an optical cable or a coaxial cable, a method of disposing all radio communication devices such as a base station or a repeater at a certain place, Was used as the dispersion method. In the conventional method, expensive facilities for using coaxial cables and optical cables with difficult facilities are used, and a method of distributing one base station signal is used. However, the present invention uses a simple frequency conversion circuit, To a Zero IF or IF signal, and then transmits it through a UTP cable for Internet service.

That is, the signal distributing apparatus of the present invention provides a method of distributing a multi-band RF signal capable of simultaneously transmitting a plurality of base station signals and signals having different frequencies, in addition to a method of transmitting one base station signal.

In addition, since the existing RF dispersion is not an Internet backhaul-based device, it is possible to provide a service by transmitting a mobile communication signal. However, since it is impossible to provide an Internet service, it is impossible to connect a device based on an Internet backhaul like a WiFi AP, It also has disadvantages.

In order to solve such a problem, the signal distributing apparatus of the present invention proposes a method of transmitting an IF signal for distributing an RF signal while simultaneously providing an Internet service for the original use of a UTP cable. The signal distributing apparatus of the present invention may be constituted of a DU (Donor Unit) wired to the mobile communication apparatus and an RU (Remote Unit) distributedly installed at a service location.

Referring to FIG. 2, the DU 200 includes a wireless communication device using an FDD scheme, converts an RF signal received from a wireless network (Internet, mobile communication base station, repeater, etc.) into an IF signal, 210 to a plurality of RUs 220 connected to each other.

The plurality of RUs 220 may be means for directly interfacing with a terminal, and the DU 200 may construct / extend a service area by distributing a plurality of RUs 220 in various places. That is, the DU 200 can expand the service area by dispersively transmitting the IF signal converted from the RF signal through the UTP cable to a plurality of RUs 220.

The DU 200 converts a RF signal received from a mobile communication base station or a repeater into an IF signal (or a Zero IF signal) by using a frequency conversion circuit and transmits a cable for data communication such as RS232, RS422, And distributed to each RU 220 through various cables such as a cable for service.

Also, DU 200 can transmit multi-band RF signals by simultaneously transmitting not only RF signals received from one mobile communication base station or repeater, but also RF signals having different frequencies from a plurality of mobile communication base stations or repeaters at the same time .

3 is a diagram for explaining the arrangement of an IF frequency band for RF dispersion and IF frequency transmission for each Pin when a UTP cable is used.

FIG. 3 explains the arrangement of IF frequency allocation for RF dispersion and data allocation for Internet service in an RF dispersing apparatus using a UTP cable in a mobile communication system using an FDD scheme, The data transfer method will be described.

The arrangement of IF signals in an RF dispersing apparatus for dispersing and transmitting multi-band RF signals will be described.

UTP cable has been confirmed through experiments that high quality transmission with low signal loss is possible by transmitting IF signal of low frequency band. For example, a UTP cable transmits a signal having a frequency of 150 MHz or less to a length of 100 m, resulting in a loss of about 17 dB. However, the signal is very little distorted and a plurality of signals of the same frequency are transmitted to a plurality of strands in the UTP cable , It can be confirmed that the signal separation per cable inner cable is about 40 dB or more.

Since the Tx and Rx signals of the mobile communication apparatus using the FDD scheme use different frequencies, since the Tx signal and the Rx signal are continuously transmitted and the frequencies below 150 MHz must be used, the Tx signal and the Rx signal do not overlap each other 3, the IF frequency should be placed.

This is because when the Tx signal and the Rx signal overlap each other, the degree of signal separation per cable is about 40 dB, and if the Tx signal level is -10 dBm, the level that flows into the Rx Path of the Tx signal is -50 dBm, If a Tx signal of about -50dBm is input, normal service can not be provided.

Internet services on UTP cables typically use two pairs of internal copper wires. In the past, 4 pairs of internal copper lines were used for Internet service of 1Gbps, but in the Ethernet transmission of n Base T standard, 1Gbps class signal transmission is possible even if two pairs of 4 copper wires are used.

In FIG. 3, 1, 2, 3, and 6 copper lines of 8 strands are used for Ethernet data transmission for Internet service, and 4, 5, 7 and 8 copper lines are used for IF signal transmission of mobile communication signals for RF dispersion Respectively.

In FIG. 3, DU can transmit Internet Data A through UTP-1 and UTP-2. Similarly, DU can transmit other Internet Data B via UTP-3, 6.

DU also has a frequency of 15 to 35 MHz for 'mobile communication A, Main-Tx', a frequency of 45 to 65 MHz for 'mobile communication A, Main-Rx' 95 MHz, the mobile communication B, and the Main-Rx, and the UTP-4 and the UTP-5 can be transmitted.

Similarly, DU has a frequency of 15 to 35 MHz for 'mobile communication A, MIMO-Tx', a frequency of 45 to 65 MHz for 'mobile communication A, MIMO-Rx' To 95 MHz, and to the mobile communication B and the MIMO-Rx, the frequency is 105 to 125 MHz, and the UTP-7 and 8 can be transmitted.

It is also possible to arrange the internal copper wire by changing the mutual signals using the pairs 1, 2, 3, 6, 4, 5, 7 and 8.

The signals that can be transmitted through the four pairs of copper lines shown in FIG. 3 correspond to a 1-Gbps-level Internet signal and a 2-band mobile communication signal capable of providing a 2x2 MIMO service. In FIG. 3, the mobile communication signal is shown with an example having a bandwidth of 20 MHz, but the bandwidth can be changed. That is, if the bandwidth is 10 MHz, the arrangement of the signals may be performed by narrowing the entire frequency range or widening the intervals for each IF signal.

Further, when the frequency bandwidth is widened to 30 MHz, the arrangement of the signals can be performed so that the total transmission frequency is changed.

RF signals transmitted over UTP cable can be transmitted without distortion up to 1 GHz, but transmission loss can be greatly increased. Compensation for this loss is possible through amplification. However, the high amplification amplifies the noise level at the same time, causing deterioration of quality or generation of oscillation.

3, in the case of transmission through a UTP cable, a reference clock is simultaneously transmitted in order to secure the same frequency as that of the mobile communication apparatus in the RU of the RF distributing apparatus other than the Tx / Rx signal for the service of the mobile communication apparatus Up to the reference clock arrangement.

Generally, the reference clock means a reference clock of a phase locked loop (PLL) circuit for generating a local frequency, and generally uses a CW (Continuous Wave) signal between 10 MHz and 40 MHz. The reference clock selects a frequency that does not overlap with the IF signal.

4 is a diagram showing the structure of DU.

4 illustrates the DU structure of the RF dispersing apparatus in the mobile communication system using the FDD scheme.

The DU can be composed of an RF module and a UTP distributor, and the DU can be wired to a mobile communication device using the FDD method.

FIG. 4 shows an example of a DU connected to two radio communication apparatuses (mobile communication base stations, repeaters, etc.). The two wireless communication apparatuses may use a mobile communication apparatus, such as LTE, providing the same service, by connecting different mobile communication apparatuses and setting different frequencies, or by connecting respective mobile communication apparatuses providing different services.

If only one mobile communication device is connected, the mobile communication base station of FIG. 4 or the RF module corresponding to the relay B and the mobile communication B may be removed.

The UTP distributor is capable of connecting multiple RUs via a UTP cable.

The DU having the structure as shown in FIG. 4 can be used to solve the interference problem due to overlapping of the signals output from the small base station when a large number of small base stations are installed and the service area is expanded.

In addition, DU can disperse RF signals received from large base stations into a large number of RUs to solve shaded areas in large buildings, and can also provide LTE and WCDMA hybrid services or multi-band LTE services in various bands do.

As shown in FIG. 3, DU can be connected to four wireless communication devices when the frequency bandwidth is not 20 MHz but is 10 MHz, and can be extended to connect to eight wireless communication devices when the bandwidth is 5 MHz.

In FIG. 4, the switch module for providing the Internet service can use a switch device generally used or an ONU used in the FTTH network. Switch devices or ONUs can generally support 24 ports.

The switching device and the UTP port of the ONU are not only capable of Ethernet signal transmission of the existing 10/100/1000 Base-T standard, but also using 4 chips (switch chip) It is possible to transmit a maximum of 1 Gbps Ethernet signal through a pair of copper lines.

In FIG. 4, the Ethernet signals output through the switch module are arranged at UTP cable 1, 2, 3 and 6, and the mobile communication signals are arranged at UTP cables 4, 5, 7 and 8.

5 is a diagram showing a structure of an RF module inside DU.

Fig. 5 illustrates the structure of the RF module in the DU in the mobile communication system using the FDD scheme.

Most mobile communication devices can provide a 2 x 2 MIMO (multiple input / output) service with two Tx path and Rx path. Accordingly, in order to allow the DU connected to the wireless communication apparatus to accommodate the 2 x 2 MIMO service, it is possible to configure Tx Path and Rx Path as 2 Paths, respectively, as shown in FIG.

Since the Tx Path and the Rx Path use frequencies different from each other, the wireless communication apparatus using the FDD scheme can convert paths into IF signals having different frequencies after separating paths so as not to overlap each other (See frequency placement of the IF signal).

FIG. 5 shows an example of separation into two RF modules so that they can be connected to different radio communication apparatuses. DU can be equipped with either two modules or can be equipped with either RF module as required.

Further, the RF module may further include a circuit capable of simultaneously transmitting a reference clock usable as a PLL reference signal of the RU, in addition to a frequency conversion function of a Tx / Rx signal.

In addition, the RF module may further include a circuit capable of transmitting a control signal for remote operation of each RU as needed.

In addition, the RF module may further include two splitters for Tx / Rx separation and Main / MIMO separation. As shown in FIG. 3, the splitter divides the frequency-divided IF signals into four types of IF signals and transmits them through a UTP cable, thereby minimizing the interference of the Tx signals converted to the IF frequency and providing the MIMO service in the RU .

In addition, the RF module can change the path arrangement in the reverse order of the IF signals (Rx signals) so that the IF signals (Rx signals) received from the RU can be transmitted to the corresponding radio communication apparatuses.

In most cases, a mobile communication base station using the FDD scheme can have a structure in which a Tx frequency and an Rx frequency are served through a single antenna using a duplexer.

The RF module is designed with a duplexer at the DU end for easy connection with wireless communication devices of this structure. If the Tx signal and the Rx signal are separately provided without using the duplexer in the wireless communication apparatus, the duplexer is deleted from the RF module of FIG.

6 is a diagram showing a structure of a UTP distributor in a DU.

6 illustrates a structure of a UTP distributor in the DU in the mobile communication system using the FDD scheme.

Referring to FIG. 6, a UTP distributor in the DU performs impedance matching for transmitting four types of IF signals separated by Tx / Rx separation and main / MIMO signals in an RF module using a UTP cable, It can be connected to each pin of the UTP cable after conversion to the IF signal of the type.

The UTP panel may serve to connect the differential IF signals output from the RF module to a corresponding connector.

The Power Sourcing Equipment (PSE) module may refer to a Power of Ethernet (PoE) power supply module capable of transmitting power together with the above IF signals to a UTP cable or a data cable for RS485 transmission.

The number of distributors of FIG. 6 may be determined according to the number of RUs to be distributed, and approximately twelve or twenty-four distributors may be used.

7 is a diagram showing a structure of an RU.

7 illustrates the structure of an RU in a mobile communication system using the FDD scheme.

Referring to FIG. 7, the RU may include a UTP distributor for separating an IF signal transmitted from a DU and an Internet signal, and an RF module for converting an IF signal to an RF signal.

Although DU configures the RF module to facilitate the connection of two base stations, the RU can be composed of two RF modules divided into Main / MIMO to provide MIMO service using two antennas.

In the UTP distributor of FIG. 7, UTP cables 1, 2, 3, and 6 may be used for Internet service.

8 is a diagram showing the structure of the RF module in the RU.

8, the structure of the RF module in the RU in the mobile communication system using the FDD scheme will be described.

Referring to FIG. 8, the RF module in the RU may function to re-convert the received IF signal to an RF signal. For reference, FIG. 3 shows frequency placement for the IF signal.

The RU can generate a local frequency through the PLL circuit, using the same reference clock as the reference clock used in DU. That is, by using the same clock as DU, the RU can have the same frequency characteristic as the frequency of the RF signal initially transmitted in the radio communication apparatus, even when the clock with high precision is not used.

Hereinafter, the operation flow of the signal distributor 100 according to the embodiments of the present invention will be described in detail with reference to FIG.

9 is a flowchart illustrating a procedure of a signal distribution method according to an embodiment of the present invention.

The signal distributing method according to the present embodiment can be performed by the signal distributing apparatus 100 described above.

Referring to FIG. 9, in step 910, the signal distributor 100 checks the number of RUs (Remote Units) distributed in the service area.

In step 920, the signal distributor 100 allocates n (n is a natural number) frequencies corresponding to the identified number to each of the RUs.

For example, the signal distributor 100 may allocate different frequencies to the RUs using a Frequency Division Duplex (FDD) scheme.

At this time, when the RF signal is received from different types of wireless communication devices, the signal distributor 100 may allocate a frequency that is further divided for each wireless communication device to each of the RUs.

In step 930, the signal distributor 100 converts the RF signal received from the wireless network into an IF signal.

For example, the signal distributor 100 transmits a zero IF signal, which is a type of interlocking signal between a baseband modem in a wireless communication device that receives the RF signal and an RF unit that processes the RF signal, And output it as a signal.

In step 940, the signal distributor 100 transmits the IF signal to the corresponding RU through the UTP cable using the allocated frequency.

At this time, the signal distributor 100 can transmit the IF signal to the RU while maintaining the transmission of the Internet signal by the UTP cable.

In other words, the signal distributor 100 can simultaneously provide the Internet service in transmitting the IF signal that is differentiated for each RU by different allocation of frequencies.

In the present invention, it is described that the present invention is applied to the UTP cable having the most facilities, but the FTP cable and the STP cable are also applicable. A UTP cable is a twisted pair of eight internal cables, each of which is made up of four pairs of twisted cables.

The present invention may be a method of transmitting an IF signal or a Zero IF signal to a pair of internal cables. In other words, a total of four different IF signals and zero IF signals can be transmitted in four separate pairs of cables. UTP cable can be connected between devices using RJ-45 connector.

Since the IF signal transmitted through the UTP cable has a low loss at the low frequency (near 0 Hz) of the UTP cable and a large loss at the high frequency (near 1 GHz), the DU and RU RF modules of the signal distributor transmit / A separate equalizer circuit can be added to make the signal levels the same. This equalizer circuit has a function to set the gain between 0Hz and 150MHz proportional to the loss of the UTP cable.

Here, the mutual RUs are connected by various cables for exchange of Internet signals and data communication, and the signal distributor 100 can transmit the IF signal through these cables.

The signal distributor 100 may transmit a reference clock for frequency synchronization in the RU and a power source for starting the corresponding RU together with the IF signal through the UTP cable.

In addition, the signal distributor 100 can transmit power for starting to the new RU via the RU in conjunction with the expansion of the service area.

The signal distributor 100 may perform at least one of impedance matching with the RU, gain and impedance equalizer application, resonance prevention, differential transmission, and a PLL (phase locked loop) reference clock, Signal to the corresponding RU.

According to an embodiment, the signal distributing apparatus 100 identifies a new RU connected to the RU by the UTP cable, which is located outside the service area, and transmits the IF signal to the new RU To extend the service area.

Further, according to another embodiment, the signal distributor 100 may further include a distributor for performing connection to the UTP cable.

The method according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: Signal distributor
110: Identification unit 120: Assignment unit
130: conversion unit 140:
150: identification unit 160: distribution unit

Claims (7)

An allocation unit allocating different frequencies to each other using RUs (Remote Units) distributed in a service area using a Frequency Division Duplex (FDD) scheme;
A converter for converting the RF signal received from the wireless network into an IF signal; And
When the IF signal, which is differentiated by RUs, is transmitted to the corresponding RU by different allocation of frequencies, i) the RU # 1 to which the first frequency is allocated, via the UTP cable (Unshielded Twisted Pair cable) To transmit the separated IF signal to the RU # 1 while maintaining the transmission of the Internet signal by the UTP cable, and ii) a second frequency different from the first frequency is allocated And transmits the IF signal separated for the RU # 2 to the RU # 2 through the data cable,
Lt; / RTI >
Wherein the transmission unit comprises:
A reference clock for frequency conversion and a power source to the RU # 2 simultaneously with the IF signal by the data cable,
A reference clock for frequency synchronization in the corresponding RU, and a power source for starting the corresponding RU to the corresponding RU together with the IF signal via the UTP cable
Signal distributor using UTP cable. The method according to claim 1,
When the RF signal is received from different types of wireless communication devices,
Wherein the allocating unit comprises:
A frequency that is further divided for each wireless communication device is allocated to each of the RUs
Signal distributor using UTP cable. delete The method according to claim 1,
Wherein,
A Zero IF signal, which is a type of interlocking signal between a baseband modem in a wireless communication device receiving the RF signal and an RF unit for processing and outputting the RF signal,
Signal distributor using UTP cable. The method according to claim 1,
The signal distributing device comprises:
An identification unit which is located outside the service area but identifies a new RU connected to the RU by the UTP cable,
Further comprising:
Wherein the transmission unit comprises:
Transmitting the IF signal to the new RU using the frequency allocated additionally by the allocating unit,
Signal distributor using UTP cable. The method according to claim 1,
The signal distributing device comprises:
A distribution unit for connection to the UTP cable
And a signal distributor using the UTP cable. Allocating different frequencies to each of RUs distributed in a service area using an FDD scheme;
Converting an RF signal received from the wireless network into an IF signal;
Transmitting the IF signal separated by RUs to a corresponding RU by different assignments of frequencies, comprising the steps of: i) transmitting an IF signal to the RU # 1 for the RU # 1, via an UTP cable, to RU # And transmitting the IF signal to the RU # 1 while maintaining the transmission of the Internet signal by the UTP cable, ii) an RU # 2 to which a second frequency different from the first frequency is allocated, Transmitting a separate IF signal for # 2 over a data cable; And
A reference clock and a power source for frequency conversion are transmitted to the RU # 2 simultaneously with the IF signal by the data cable, and a reference clock for frequency synchronization in the RU and a power source for starting the corresponding RU, Transmitting to the corresponding RU together with the IF signal via a UTP cable
A signal distribution method using a UTP cable.

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