KR101525739B1 - Signal dispersion method and signal dispersion apparatus - Google Patents

Abstract

Disclosed are a signal distribution method and a signal distribution apparatus. According to an embodiment of the present invention, the signal distribution method comprises the steps of: confirming remote units (RU) which are distributed and arranged in a service area; allocating a communication time to each of the confirmed RUs; converting an RF reception signal received from a wireless network into an IF reception signal; and transmitting the IF reception signal to a corresponding RU via a wire cable for the allocated communication time.

Description

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

The present invention relates to a method and apparatus for identifying an RU (Remote Unit) distributed in a service area, allocating a communication time to each of the identified RUs, converting an RF received signal received from the wireless network into an IF received signal, Unshielded twisted pair < / RTI > cable over a wired cable to the corresponding RU for the allocated communication time. According to the present invention, the RF receiving signal of the wireless network is effectively transmitted to a plurality of distributed RUs utilizing the wired infrastructure of the cable, and a signal for expanding the service area to the inside or outside of the building A dispersion method, and a signal distributing apparatus.

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.

An apparatus according to a conventional RF dispersion method used in a mobile communication service system such as a WIBRO or a TD-LTE (Time Division Long Term Evolution) is a system in which a wireless RF signal and an IF signal are dispersively transmitted through a coaxial cable, Signals were converted into optical signals and distributed over optical cables. 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, a conventional apparatus for extending a service area using a conventional small base station such as a Wi-Fi access point (AP) is not limited to simply distributing only an RF signal, but uses a plurality of base stations having independent cell regions Since the RF signals are dispersed, the quality of service may be degraded due to frequent hand overs occurring due to the location of a plurality of base stations in a narrow space and interference due to signal overlap.

Particularly, in a Wi-Fi AP using the 2.4 GHz ISM band, a plurality of Wi-Fi signals (for example, 13) having a bandwidth of 20 MHz in the 83 MHz band are overlapped with each other and more interference signals exist, Many usage restrictions can occur. Further, in order to solve such an interference problem, expensive equipment such as an interference cancellation technique and an access controller are additionally used.

Accordingly, in the present invention, an RF reception signal from a wireless communication device using a TDD (Time Division Duplex) scheme is converted into an IF reception signal through various types of wired cables such as a data cable and a UTP cable, We propose a technique for distributed transmission to a deployed RU (Remote Unit).

In the embodiment of the present invention, the RUs distributed in the service area are identified, the communication time is allocated to each of the identified RUs, the RF reception signal received from the wireless network is converted into the IF reception signal, And to extend the service area inside or outside the building by transmitting the IF reception signal to the corresponding RU through the same wired cable during the allocated communication time.

In addition, the embodiment of the present invention separately transmits an IF signal or a Zero IF signal, which is a type of signal transmission between a modem baseband signal processing unit and an RF unit of a communication device, to each RU using a differential IF signal, To the service area.

Further, the embodiment of the present invention can be used to replace the method of using a plurality of small base stations by extending RF signals in various wireless communication base stations and repeaters using the TDD method, and to improve service quality by minimizing the influence of interference .

In addition, embodiments of the present invention can simultaneously transmit a reference clock for frequency conversion and a power source through a low-cost data cable, thereby enabling a wireless backhaul transmission device using a TDD scheme, a Wi-Fi, a WiBro WIBRO) and TD-LTE, and to make it possible to manufacture a low-cost device.

It is another object of the present invention to provide a signal distributing apparatus and a signal distributing method which can be selectively applied according to a usage purpose and a method in a mobile communication employing a synchronous TDD scheme and a wireless communication using an asynchronous TDD scheme .

In addition, the embodiment of the present invention extends the service area by dispersively transmitting RF reception signals received from a Wi-Fi AP concentrated in a certain place to each RU in the form of an IF reception signal, And aims to provide an inexpensive and excellent service without additionally using expensive equipment such as an interference cancellation technique and an access controller while solving the interference problem caused by overlapping. Here, the WiFi AP can use, for example, a 2.4 GHz ISM band.

In addition, embodiments of the present invention distribute RF signals distributed over a coaxial cable to various RUs by using various cables such as UTP, RS232, and RS485 data cables to ensure facility convenience and reduce costs And to save money.

According to an aspect of the present invention, there is provided a signal distribution method including: confirming an RU (Remote Unit) distributed in a service area; allocating a communication time to each of the identified RUs; Converting the RF received signal to an IF received signal and transmitting the IF received signal to the corresponding RU for the allocated communication time via a wired cable.

According to another aspect of the present invention, there is provided a signal distributing apparatus comprising: a confirming unit for confirming an RU distributed in a service area; an allocating unit allocating a communication time to each of the identified RUs; A conversion unit for converting the RF reception signal into an IF reception signal, and a transmission / reception unit for transmitting the IF reception signal to the corresponding RU through the wired cable during the allocated communication time.

According to an embodiment of the present invention, an RU distributed in a service area is identified, a communication time is assigned to each of the identified RUs, an RF received signal received from the wireless network is converted into an IF received signal, By transmitting the IF reception signal to the corresponding RU through the wired cable such as a UTP cable during the allocated communication time, 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, which is a form of signal transmission between a modem baseband signal processing unit and an RF unit of a communication device, is separately transmitted to each RU using a differential IF signal, Can be distributed and arranged in the service area.

Also, according to an embodiment of the present invention, RF signals from various wireless communication base stations and repeaters using the TDD scheme are extended in the form of an IF signal through a cable, so that interference problems, Hand over problems can be minimized and service quality can be improved.

In addition, according to an embodiment of the present invention, a reference clock for frequency conversion and a power source are simultaneously transmitted through a low-cost data cable, so that a wireless backhaul transmission device using a TDD scheme, a Wi- , WiBro (WIBRO), TD-LTE, and the like, and it is possible to manufacture a low-cost device.

According to an embodiment of the present invention, a service area is expanded by dispersively transmitting RF reception signals received from Wi-Fi APs concentrated in a predetermined place to respective RUs in the form of IF reception signals, It can provide low cost and excellent service without using additional equipment such as interference cancellation technology and access controller while solving the interference problem caused by use and frequency overlap.

In addition, according to an embodiment of the present invention, mutual interference generated when transmitting an RF signal through a data cable that is not shielded can be minimized, thereby ensuring service quality.

Also, according to an embodiment of the present invention, it is possible to solve the problem of reduction of the service area due to an increase of the reverse (Rx) noise signal due to connection of a plurality of RF dispersion apparatuses and reduction of capacity.

In addition, according to an embodiment of the present invention, it is possible to simultaneously reduce facility investment costs by suggesting a low-cost apparatus manufacturing method with a minimum hardware configuration.

In addition, according to the embodiment of the present invention, it is possible to distribute the RF signal in the form of an IF signal or a Zero IF signal through the UTP cable and the data cable, which are easy to install, have.

In addition, according to the embodiment of the present invention, it is possible to use various types of UTP cables.

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 using dispersion of RF signals in a wireless communication apparatus using the TDD scheme.
3 is a diagram showing switching timing between Tx and Rx in a wireless communication apparatus using a synchronous TDD scheme.
4 is a diagram showing switching timings between Tx and Rx in a radio communication apparatus using an asynchronous TDD scheme.
5 illustrates an IF frequency allocation for RF dispersion when a single band frequency is used in one wireless communication apparatus using a synchronous TDD scheme and an IF frequency transmission process for each pin when a UTP cable is used FIG.
6 illustrates an IF frequency allocation for RF dispersion when a dual band frequency is used in one wireless communication apparatus using an asynchronous TDD scheme and an IF frequency transmission process for each pin when using a UTP cable FIG.
FIG. 7 is a diagram illustrating a structure of a DU according to an embodiment of the present invention, which is connected to one wireless communication apparatus using a single band frequency in a synchronous TDD scheme.
FIG. 8 is a diagram illustrating a structure of a DU according to another embodiment of the signal distributing apparatus according to the present invention, which is connected to one radio communication apparatus using an asynchronous TDD scheme and using a dual band frequency.
9 is a diagram showing a structure of an RF module inside the DU shown in FIG.
10 is a diagram showing a structure of a UTP distributor inside the DU shown in FIG.
11 is a view showing a structure of a UTP distributor inside the DU shown in FIG.
12 is a diagram illustrating a structure of an RU when an IF reception signal is transmitted to an RU distributed in a service area by the signal distributing apparatus according to the present invention.
FIG. 13 is a diagram showing a structure of an RF module in an RU when an IF reception signal is transmitted by DU shown in FIG. 7. FIG.
FIG. 14 is a diagram showing a structure of an RF module in an RU when an IF reception signal is transmitted by DU shown in FIG. 8. FIG.
FIG. 15 is a diagram showing the characteristics of a filter used in designing the RU shown in FIG. 14. FIG.
FIG. 16 is a diagram showing a service frequency allocation when designing an RU using a filter showing the characteristics shown in FIG. 14. FIG.
FIG. 17 is a diagram for explaining the structure and operation principle of a differential zero IF signal transmission in the signal distributor according to the present invention. Referring to FIG.
18 is a diagram illustrating a process of generating an impedance conversion and a differential signal for transmitting an RF signal from a wireless communication apparatus through a UTP cable and a data cable.
19 is a diagram illustrating an example of a service network for transmitting an RF signal from a Wi-Fi AP to an RU distributed in a service area.
20 is a diagram illustrating another example of a service network that transmits RF signals from a TD-LTE base station to RUs distributed in a service area.
FIG. 21 is a diagram illustrating another example of a service network for transmitting an RF signal from a WiBro base station to an RU distributed in a service area.
22 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.

1, the signal distributor 100 may include an identifying unit 110, an assigning unit 120, a converting unit 130, and a transmitting / receiving unit 140. In addition, according to the embodiment, the signal distributing apparatus 100 can be configured by adding the controller 150, the identifying unit 160, and the distributing unit 170, respectively.

The confirmation unit 110 identifies an RU (Remote Unit) distributed in a service area.

For example, the confirmation unit 110 may perform a function of confirming the location and the number of the RUs as a destination for transmitting an IF reception signal, which will be described later. For example, the verification unit 110 can identify RUs arranged in five layers from the first floor to the fifth floor in the 'sky' building.

The signal distributing apparatus 100 of the present invention is connected to a radio communication apparatus to which a TDD (Time Division Duplex) scheme is applied, transmits an RF reception signal received from a radio communication apparatus to an RU, To the wireless communication device.

For this purpose, the verification unit 110 can confirm the information on the wireless communication device connected to the signal distributor 100, for example, the communication mode, the band, the number of the wireless communication devices, and the service type.

For example, the confirmation unit 110 can check whether the 'communication method' of the connected wireless communication device is 'TDD'. Also, when the communication method is confirmed by the TDD method, the confirmation unit 110 can further confirm whether the communication method is 'synchronous TDD method' or 'asynchronous TDD method'.

Here, the synchronous TDD scheme is a scheme in which synchronization is performed between Tx time (i.e., forward transmission time) and Rx time (i.e., reverse transmission time) of all base stations and repeaters by a GPS receiver, and mobile communication, WIBRO, and TD A synchronous TDD scheme can be applied to a wireless communication base station and a repeater such as LTE.

In the asynchronous TDD scheme, non-fixed time is allocated to Tx time and Rx time, respectively, and asynchronous TDD scheme can be applied in a wireless communication device such as a Wi-Fi AP.

Also, the confirmation unit 110 can confirm the 'band' in the wireless communication device. For example, the confirmation unit 110 can confirm whether a 'single band frequency' is used in a wireless communication apparatus to which a synchronous TDD scheme is applied. In addition, the confirmation unit 110 can confirm whether a 'dual band frequency' is used in a wireless communication apparatus to which the asynchronous TDD scheme is applied.

In addition, the confirmation unit 110 can identify a 'service' provided by each wireless communication device connected to the signal distributing apparatus 100 of the present invention. For example, the confirmation unit 110 can confirm whether the mobile communication base station provides different communication services such as TD-LTE, or provides similar short-range wireless communication services such as a plurality of Wi-Fi APs.

Therefore, the signal distributing apparatus 100 of the present invention can allocate the communication time in consideration of the communication method and band used in the wireless communication apparatus, the number of wireless communication apparatuses, and the service provided by each wireless communication apparatus .

The allocating unit 120 allocates the communication time to each of the identified RUs. That is, the allocation unit 120 can allocate communication time periods of different time zones to the RUs using the TDD scheme.

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

The control unit 150 determines whether the first frequency when the IF reception signal is transmitted to the RU and the second frequency when the IF transmission signal is received from the RU are the same.

That is, the control unit 150 determines whether the RF reception signal is received from a radio communication apparatus (for example, TD-LTE) using a single band frequency (15 to 35 GHz) or a dual band frequency (2.4 GHz and 5 GHz) (E.g., a Wi-Fi AP) to be used.

The allocating unit 120 may receive the IF transmission signal from the RU when the control unit 150 determines that the first frequency and the second frequency are identical, It is possible to allocate the communication time in which Rx times are not overlapped.

That is, when the signal distributing apparatus 100 of the present invention is connected to one wireless communication apparatus or a plurality of wireless communication apparatuses providing the same service, the allocating unit 120 allocates a signal (hereinafter referred to as " Such that the Tx time for transmitting the RF reception signal to the RU and the Rx time for transmitting the signal (i.e., the IF transmission signal) received from the RU to the radio communication device do not overlap with each other, The communication time is divided and assigned to each of the RUs such as Tx time '0 to 1, 2 to 3, 4 to 5 msec' and Rx time to '1 to 2, 3 to 4 msec' can do.

In this case, when the RF reception signal is received from a plurality of radio communication apparatuses providing the same service using the same frequency (for example, 15 to 35 MHz), the allocation unit 120 allocates the Tx time The communication time including the Rx time can be assigned to coincide with each of the wireless communication apparatuses.

Meanwhile, when the RF received signal is received from different kinds of radio communication apparatuses providing different services such as TD-LTE and WiBro repeaters, the allocation unit 120 allocates the communication time to each of the radio communication apparatuses Or may be assigned differently.

In this case, the transmission / reception unit 140, which will be described later, uses the synchronization signal (synchronization signal) of each wireless communication device to synchronize the Tx time and the Rx time in each wireless communication device, Signals can be combined and transmitted to the corresponding RU.

If the controller 150 determines that the first frequency and the second frequency are not equal to each other, the allocating unit 120 allocates a communication time including a Tx time and an Rx time, wherein the Tx time and the Rx The time for which the time overlaps can be determined as either the Tx time or the Rx time according to the set conditions.

For example, when the first frequency (2.4 GHz), the allocating unit 120 sets the communication time to the Tx time (0 to 1, 2 to 3, 4 to 5 msec), the Rx time (1 to 2, (0.5 to 1.5, 2.5 to 3.5, 4.5 to 5 msec) and Rx time (0 to 0.5, 1.5 to 2.5, 3.5 to 4 msec) for the second frequency 4.5 msec). At this time, if the Tx time allocated to the first frequency (2.4 GHz) and the Rx time allocated to the second frequency (5 GHz) are partially overlapped as shown in FIG. 4, an interference problem of inter-frequency transmission / reception signals may occur.

Accordingly, the allocating unit 120 determines the Tx time or the Rx time as a time (for example, a hatched portion in FIG. 4) in which the Tx time and the Rx time overlap each frequency, It can be easily solved.

For example, the allocating unit 120 allocates the time (0 to 0.5, 2 to 2.5, 4 to 4.5 msec) of overlapping of the Tx time at the first frequency (2.4 GHz) and the Rx time at the second frequency (5 GHz) Can be determined as the Tx time or the Rx time that are equally allocated from the point before the overlap.

As described above, 'Tx time' (4 to 5 msec) is allocated before the 'Tx time' corresponding to the overlapping time (0 to 0.5 msec) starts at the first frequency (2.4 GHz) Tx time (4.5 to 5 msec) 'is allocated before the' Rx time 'corresponding to the overlapped time (0 to 0.5 msec) starts at 2 frequency (5 GHz), the allocating unit 120 allocates the overlapped The time (0 to 0.5 msec) can be allocated to the 'Tx time' at the first frequency (2.4 GHz) allocated to the 'Tx time' from the time before the nesting.

In another example, the assigning unit 120 assigns importance (S-level) to the RF received signal transmitted at the Tx time (0 to 0.5 msec) at the first frequency (2.4 GHz) (0 to 0.5 msec) of the IF transmission signal transmitted to the IF transmission signal (0 to 0.5 msec) can be determined as the Tx time or the Rx time at which the signal having a relatively high importance is transmitted have. For example, the allocation unit 120 may determine the overlap time (0 to 0.5 msec) to be the 'Tx time' at the first frequency (2.4 GHz) at which the RF reception signal having the highest S class weight is transmitted. Here, the importance can be set in advance by the designer of the signal distributing apparatus 100 of the present invention.

As another example, the assigning unit 120 may determine the overlapped time (0 to 0.5 msec) as the Tx time (or Rx time) specified by the designer regardless of the first and second frequencies. Alternatively, the allocation unit 120 may determine the overlap time (0 to 0.5 msec) as the Tx time (or Rx time) at the frequency specified by the designer.

The conversion unit 130 converts the RF reception signal received from the wireless network into an IF (Intermediate Frequency) reception signal. That is, the converting unit 130 converts the RF received signal received by radio into an IF receiving 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 .

Also, when receiving the IF transmission signal from the RU through the wired cable during the communication time, the conversion unit 130 converts the received IF transmission signal into an RF transmission signal usable in the wireless network . That is, the conversion unit 130 may convert the IF transmission signal received from the RUs distributed in the area into an RF transmission signal so that the IF transmission signal can be wirelessly transmitted to the connected wireless communication device.

In other words, the conversion unit 130 converts the RF reception signal received from the wireless network into an IF reception signal usable in the wired cable, and converts the IF transmission signal received from the wired cable into an RF transmission signal usable in the wireless network It can be inversely transformed.

The conversion unit 130 converts a zero IF signal, which is a type of interlocking signal between a baseband modem in a wireless communication device that receives the RF reception signal, and an RF unit that processes the RF reception signal, And can output the received signal or the IF transmission signal.

The transmission / reception unit 140 transmits the IF reception signal to the corresponding RU through the wired cable during the allocated communication time. That is, the transmitting and receiving unit 140 can transmit an IF receiving signal that is differentiated for each RU during communication times of different time zones allocated to RUs using the TDD scheme.

In addition, the transceiver 140 receives the IF transmission signal transmitted from the RU through the wired cable during the allocated communication time, and transmits the IF transmission signal to the RF transmission unit 130 through the conversion in the conversion unit 130 To the wireless communication apparatus using the TDD scheme in the form of a signal.

In other words, the transceiver 140 may exchange at least one of the IF reception signal and the IF transmission signal with the corresponding RU through the wired cable during the allocated communication time.

Here, the RUs are connected to each other by a UTP cable for exchanging internet signals and a data cable for data communication, and the transmitting and receiving unit 140 transmits the IF receiving signal and the IF receiving signal through at least one of the UTP cable and the data cable. At least one of the IF transmission signals can be exchanged with the corresponding RU.

For example, the transmission / reception unit 140 transmits an IF reception signal to the RU # 1 over the UTP cable for the allocated Tx time (0 to 1 msec), and transmits the allocated Tx time (0 to 3 msec ) To the RU # 2. Also, the transceiver 140 receives the IF transmission signal from the RU # 1 for the allocated Rx time (1 to 2 msec) through the UTP cable, and transmits the IF transmission signal through the data cable at the allocated Rx time (3-6 msec) The IF receiving signal can be received from the RU # 2.

That is, the transceiver 140 can support the independent signal transmission without interfering with other RU by exchanging the IF reception signal and the IF transmission signal with the RU in consideration of the communication infrastructure environment surrounding the RU.

In addition, when the RF reception signal is received from different types of wireless communication devices, the transmission / reception unit 140 divides the wired cable by wireless communication devices, and transmits the IF reception signal to the corresponding RU Lt; / RTI >

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

The transmission and reception 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, Signal to the corresponding RU. That is, the transceiver 140 can minimize the signal loss due to the signal dispersion by performing the pre-interfacing operation in order to stably transmit the IF reception signal to each RU.

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

According to an embodiment, the signal distributor 100 may further include an identification unit 160. [

The identification unit 160 is located outside the service area but identifies a new RU connected to the RU through the wired cable.

The transceiver 140 may extend the service area by transmitting the IF received signal to the new RU during the additional allocated communication time by the allocator 120. [

For example, when the RU # 5 is to be additionally disposed in the underground layer that was not included in the service area, the allocator 120 allocates the Tx times (0 to 2, 3 to 4 the transmission and reception unit 140 can newly allocate the communication time including the Rx time (2 to 3, 4 to 5 msec) and the Rx time (2 to 3, 4 to 5 msec) 2, and 3 to 4 msec), the IF receiving signal and the power source are transmitted to the RU # 5, thereby extending the service area to the underground layer where the RU # 5 is located and the RU # 5.

Further, according to another embodiment, the signal distributor 100 may further include a distributor 170. [ The distribution unit 170 performs connection to the wired cable. That is, the distribution unit 170 recognizes and connects the wired cable in the service area, thereby creating an environment in which the RF signals ultimately routed to the wireless network are distributedly transmitted to a plurality of RUs distributed in the service area can do.

As described above, according to the embodiment of the present invention, the RUs distributed in the service area are identified, the communication time is allocated to each of the identified RUs, the RF reception signal received from the wireless network is converted into the IF reception signal, Through the wired cable such as a data cable and a UTP cable, the service reception area can be extended to the inside or outside of the building by transmitting the IF reception signal to the corresponding RU during the allocated communication time.

According to an embodiment of the present invention, an IF signal or a Zero IF signal, which is a form of signal transmission between a modem baseband signal processing unit and an RF unit of a communication device, is separately transmitted to each RU using a differential IF signal, Can be distributed and arranged in the service area.

Also, according to an embodiment of the present invention, RF signals from various wireless communication base stations and repeaters using the TDD scheme are extended in the form of an IF signal through a cable, so that interference problems, Hand over problems can be minimized and service quality can be improved.

In addition, according to an embodiment of the present invention, a reference clock for frequency conversion and a power source are simultaneously transmitted through a low-cost data cable, so that a wireless backhaul transmission device using a TDD scheme, a Wi- , WiBro (WIBRO), TD-LTE, and the like, and it is possible to manufacture a low-cost device.

According to an embodiment of the present invention, a service area is expanded by dispersively transmitting RF reception signals received from Wi-Fi APs concentrated in a predetermined place to respective RUs in the form of IF reception signals, It can provide low cost and excellent service without using additional equipment such as interference cancellation technology and access controller while solving the interference problem caused by use and frequency overlap.

2 to 21, a signal distributing apparatus 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 using dispersion of RF signals in a wireless communication apparatus using the TDD scheme.

Referring to FIG. 2, the DU 200 includes a wireless communication device using a TDD scheme and transmits RF reception signals received from a wireless network (e.g., Kornet in FIG. 2) to a plurality of RUs (Remote Unit) 220, as shown in FIG. The RU 220 may be a means for directly operating in cooperation 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 extend the service area by installing the base station 210 and distributing the RF reception signal to the plurality of RUs 220 through the data cable and the UTP cable.

The DU 200 converts a RF reception signal received from the base station 210 into an IF reception signal (or a Zero IF signal) by using a frequency conversion circuit and generates a data signal for data communication such as RS232, RS422, And UTP cable for Internet service to the respective RUs 220.

Also, the DU 200 can transmit the RF reception signals received from one base station as well as the RF reception signals having different frequencies from a plurality of base stations simultaneously, thereby enabling multi-band RF reception signal dispersion.

3 is a diagram showing switching timings between Tx and Rx in a wireless communication apparatus using a synchronous TDD scheme.

3 shows the time domain of the Tx signal and the Rx signal of the wireless communication apparatus using the synchronous TDD scheme.

The TDD system is a system in which the Tx signal section and the Rx signal section are time-divisionally used while using the same frequency. The synchronous TDD system is a system in which Tx signals of all frequencies and Rx signals of all radio communication apparatuses, such as TD- May be referred to as a communication method in which the timings of the first and second transmission lines coincide with each other. As shown in FIG. 3, the Tx signal and the Rx signal of all the wireless communication apparatuses providing the same service using the synchronous TDD scheme may not overlap with each other.

As shown in FIG. 3, when a DU according to an embodiment of the present invention is connected to a wireless communication apparatus of a synchronous TDD system having Tx time and Rx time that do not overlap with each other, even if a plurality of Tx frequencies are amplified in one RU, Since the signals are transmitted at the same time and the reception of the Rx signals is stopped during the time being transmitted, there may not be a time for the Tx signal and the Rx signal to overlap. The IF transmission frequency of the signal distributing apparatus applied to the synchronous TDD wireless communication apparatus can be arranged as shown in FIG.

4 is a diagram showing switching timings between Tx and Rx in a radio communication apparatus using an asynchronous TDD scheme.

4 shows the time domain of the Tx signal and the Rx signal of the wireless communication apparatus using the asynchronous TDD scheme. The asynchronous TDD scheme may refer to a communication scheme in which the timing of the Tx signal and the Rx signal of all the radio communication apparatuses and all frequencies do not coincide with each other. As shown in FIG. 3, the Tx signal and the Rx signal of all the wireless communication apparatuses providing the same service using the asynchronous TDD scheme can overlap a part of the Tx signal and the Rx signal of the plurality of wireless communication apparatuses providing the Wi- When a Wi-Fi AP (Access Point) is installed adjacent to the Wi-Fi AP, the Tx signal from one Wi-Fi AP flows into the Rx path in another Wi-Fi AP and acts as interference.

As shown in FIG. 4, in the DU connected to the asynchronous TDD type wireless communication apparatus, in which the Tx time and the Rx time can be allocated to each other, one amplifier may not be used.

Wi-Fi APs can provide services using only one frequency in the 2.4 GHz and 5 GHz bands, but Tx and Rx times are different between 2.4 GHz and 5 GHz, and 2.4 GHz and 2.4 GHz, which are served by other Wi- The signals of the 5 GHz band can also be set to have different Tx time and Rx time, respectively.

DU can transmit signals having four different frequencies in the 2.4 GHz and 5 GHz bands, as shown in FIG. 6, in connection with two Wi-Fi APs having these characteristics. At this time, the RUs can be arranged with different amplifiers as shown in FIG. 14 and spaced sufficiently apart from each other.

At this time, if FA1 frequency is assigned to Tx, FA2 frequency can be assigned to Rx, and LNA receiving FA2 Rx signal can be saturated by receiving Tx signal of very high FA1 frequency. Therefore, the RU can be designed using a filter having the characteristics shown in Fig.

5 illustrates an IF frequency allocation for RF dispersion when a single band frequency is used in one wireless communication apparatus using a synchronous TDD scheme and an IF frequency transmission process for each pin when a UTP cable is used FIG.

Referring to FIG. 5, DU may transmit an IF receive signal to only two pairs of UTP cables and not transmit an IF receive signal to the remaining two pairs of UTP cables.

The bandwidth of a wireless communication device providing the same service is difficult to exceed 80 MHz in total, and when an IF reception signal is transmitted to a different pair of UTP cable or data cable in DU, the Rx signal may not be present while the Tx signal is transmitted have. That is, there may be no influence of the interference due to the inflow of the Tx signal into the Rx signal path. However, since interference may occur between the same Rx signals, DU may have the same signal form Lt; RTI ID = 0.0 > Main / MIMO < / RTI > signal transmission.

Here, the remaining two unused UTP cables can be used for power transmission. The IF signals shown in Fig. 5 can be designed to be serviceable using one amplifier in one RU.

The DU of the present invention can distribute and transmit multi-band RF signals of a wireless communication apparatus using a synchronous TDD scheme in the form of an IF signal. Such an IF signal arrangement is shown in Fig.

Through the UTP cable and data cable, DU can transmit IF signals in the lower frequency band of 100 MHz or less with excellent quality without distortion of the signal.

When transmitting an IF signal having a frequency of 100 MHz or less at a length of 100 m through a UTP cable in the DU, the resulting loss may be about 17 dB. However, the DU according to the present invention has a relatively small IF signal distortion, and can transmit a plurality of signals of the same frequency to a plurality of twisted wires in a UTP cable, thereby making the signal separation per cable inner twisted line more than about 40 dB.

Particularly, a wireless communication apparatus using the TDD scheme can distinguish between a Tx signal and an Rx signal, which are allocated at different times while using the same frequency. Even if the frequencies for the Tx signal and the Rx signal are overlapped, no interference occurs between the Tx signal and the Rx signal unless the allocated time overlaps. Therefore, the DU according to the present invention can arrange the IF frequency as shown in FIG. However, since the Tx time and the Rx time are different from each other in TDD-type wireless communication apparatuses providing different services such as TD-LTE and WiBro, when different service signals are combined and transmitted, May need to be transmitted. In this case, a circuit configuration as shown in Fig. 14 and a filter having characteristics as shown in Fig. 15 can be applied.

For reference, in the case of the Zero IF (Analog IQ) signal, the frequency is 0 Hz and 0 Hz is used in all the paths, so that frequency placement may be omitted.

In addition, FIG. 5 includes a frequency allocation for a reference clock as well as a frequency allocation for a Tx signal or an Rx signal for service in a wireless communication apparatus when a distributed signal is transmitted through a UTP cable.

Here, the reference clock can be transmitted at the same time when the IF signal is distributedly transmitted to the respective RUs through the UTP cable in the DU so that the same clock frequency can be secured in each RU.

In general, the reference clock may refer to a reference clock of a PLL (Phase Locked Loop) circuit for generating a local frequency, and a CW (Continuous Wave) signal of approximately 10 MHz to 40 MHz may be used.

6 illustrates an IF frequency allocation for RF dispersion when a dual band frequency is used in one wireless communication apparatus using an asynchronous TDD scheme and an IF frequency transmission process for each pin when using a UTP cable FIG.

Referring to FIG. 6, when DU is connected to two WiFi APs according to an embodiment of the present invention, it is possible to transmit signals having four different frequencies in the 2.4 GHz and 5 GHz bands.

FIG. 7 is a diagram illustrating a structure of a DU according to an embodiment of the present invention, which is connected to one wireless communication apparatus using a single band frequency in a synchronous TDD scheme.

Referring to FIG. 7, the DU of the present invention can be connected to a plurality of wireless communication apparatuses providing the same service. The DU may be composed of a splitter and an RF module and a UTP distributor for combining and distributing a plurality of base station signals.

7 shows an example of a DU connected to four wireless communication apparatuses (wireless communication apparatus # 1, wireless communication apparatus # 2, wireless communication apparatus # 3, wireless communication apparatus # 4). Here, the wireless communication device may be, for example, a mobile communication, a WiBro and a TD-LTE base station / repeater, a wireless backhaul device, and the like.

DU may connect each wireless communication device that provides the same service and connect each wireless communication device having different frequencies such as frequency A and frequency B after setting the frequency differently or providing different services Can be used.

At this time, when DU is connected to one wireless communication apparatus, it can be configured by removing the wireless communication apparatus # 2, the wireless communication apparatus # 3, and the wireless communication apparatus # 4 shown in FIG.

The UTP distributor can be connected to multiple RUs via UTP cable.

The DU shown in FIG. 7 can solve the interference problem due to superposition of 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, the DU can distribute RF signals received from a large base station to a plurality of RUs to remove shadow areas in a large building, and to provide a mixed service between TD-LTE and WiBro.

In addition, DU can be connected to eight wireless communication devices when the frequency bandwidth is not 20 MHz but 10 MHz, and can be scalable to connect to 16 wireless communication devices when the frequency is 5 MHz.

FIG. 8 is a diagram illustrating a structure of a DU according to another embodiment of the signal distributing apparatus according to the present invention, which is connected to one radio communication apparatus using an asynchronous TDD scheme and using a dual band frequency.

Referring to FIG. 8, the DU of the present invention can be connected to a plurality of wireless communication devices providing the same service. The DU may be composed of a splitter, an RF module and a UTP distributor for combining and distributing a plurality of base station signals.

8 shows an example of a DU connected to two radio communication apparatuses (radio communication apparatus # 1, radio communication apparatus # 2). DU can service signals with a total of four frequencies by connecting two Wi-Fi APs providing the same service.

According to the embodiment, when DU is connected to one Wi-Fi AP, the wireless communication device # 2 shown in FIG. 8 can be removed from the DU. On the other hand, one Wi-Fi AP can simultaneously service 2.4 GHz and 5 GHz, so that the RF module corresponding to frequency B can be included in DU without being removed from DU.

The UTP distributor can be connected to multiple RUs via UTP cable.

The DU shown in FIG. 8 can 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.

9 is a diagram showing a structure of an RF module inside the DU shown in FIG.

Generally, a wireless communication apparatus can provide a 2 * 2 MIMO (multiple input / output) service composed of two Tx path and Rx path.

Accordingly, as shown in FIG. 9, the DU connected to the wireless communication apparatus can configure Tx Path and Rx Path as 2 Paths, respectively, so as to accommodate the 2 * 2 MIMO service.

FIG. 9 shows a structure of a DU internal RF module connected to a wireless communication device using an asynchronous TDD scheme.

Since the Tx Path and the Rx Path use the same frequency, the wireless communication apparatus using the TDD scheme can simultaneously convert the Tx signal and the Rx signal into the IF signal using one local frequency. The RF module may place an IF signal as shown in FIGS. 5 and 6 to minimize interference effects due to Tx signals converted to an IF frequency and enable MIMO service provisioning in the RU.

The RF module included in the DU may further include a circuit capable of simultaneously transmitting a reference clock usable as the PLL reference signal of the RU in addition to the frequency conversion function of the 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.

For reference, when DU according to an embodiment of the present invention is connected to a wireless communication apparatus using a synchronous TDD scheme, DU can be designed by removing an RF module corresponding to the frequency B shown in FIG.

10 is a diagram showing a structure of a UTP distributor inside the DU shown in FIG.

Referring to FIG. 10, in the DU, the UTP distributor performs impedance matching for transmitting Main / MIMO IF signals transmitted from an RF module to a UTP cable and a data cable, converts the IF signals into a differential IF signal, UTP cable and data cable.

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

A Power Sourcing Equipment (PSE) module may refer to a Power of Ethernet (PoE) power supply module capable of simultaneously transmitting power with UTP cables or data cables together with the IF signals. Here, the data cable may be, for example, a cable for RS485 transmission.

Here, the number of splitters to be used may be determined according to the number of distributed RUs, and about twelve or twenty-four splitters may be used.

11 is a view showing a structure of a UTP distributor inside the DU shown in FIG.

Referring to FIG. 11, the UTP distributor in the DU performs impedance matching for transmitting the multi-band main and MIMO IF signals transmitted from the RF module to the UTP cable and the data cable, converts the IF signals into separated IF signals, And each pin of the data cable.

The UTP panel can serve to connect the separated IF signals output from the RF module to the corresponding connector.

The PSE module may refer to a power supply module of PoE capable of simultaneously transmitting power with UTP cable or data cable together with the above IF signals. Here, the data cable may be, for example, a cable for RS485 transmission.

Here, the number of splitters to be used may be determined according to the number of distributed RUs, and about twelve or twenty-four splitters may be used.

12 is a diagram illustrating a structure of an RU when an IF reception signal is transmitted to an RU distributed in a service area by the signal distributing apparatus according to the present invention.

Referring to FIG. 12, the RU may be composed of two RF modules so that a MIMO service can be provided using two antennas. The RU may be the differential IF signal transmitted from the DU and the power coupled signal.

The RU may distribute the combined signal for connection with a new RU, then re-split the distributed signal into a power source and an IF signal through the PoE PD module, and frequency convert the signal into an RF signal.

FIG. 13 is a diagram showing a structure of an RF module in an RU when an IF reception signal is transmitted by DU shown in FIG. 7. FIG.

FIG. 13 shows an RU internal RF module when a single-band frequency is used in one wireless communication apparatus using a synchronous TDD scheme.

Referring to FIG. 13, the RF module in the RU can function to re-convert the received IF signal into an RF signal. That is, the RF module in the RU can convert the IF-converted signals into RF signals according to the frequency arrangement as shown in FIG.

FIG. 14 is a diagram showing a structure of an RF module in an RU when an IF reception signal is transmitted by DU shown in FIG. 8. FIG.

FIG. 14 shows an RU internal RF module when a dual band frequency is used in one wireless communication device using the asynchronous TDD scheme.

Referring to FIG. 14, the RF module in the RU can re-convert IF-converted signals into RF signals according to the frequency allocation as shown in FIG.

The RF module is different in the radio communication apparatuses connected at different frequencies (13 signals in the 2.4 GHz band in the case of Wi-Fi) in the same frequency band, and the timing for distinguishing the Tx signal and the Rx signal for each radio communication apparatus It is possible to separate all the paths and then combine them again as shown in FIG.

A duplexer that combines two frequencies of the same band in the RF module can be fabricated by combining filters having the characteristics shown in Fig.

In the case of Wi-Fi, FA # 1 and FA # 13 may have an interval of 40 MHz in the middle as shown in FIG. A filter applied to a path passing FA 13 may have a characteristic of filtering FA more than 50 dB as shown on the left side of FIG. 14, and a filter applied to a path passing FA 1 may be As shown on the right side of Fig. 14, it is possible to have the characteristic of filtering FA # 13 by 50 dB or more.

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.

Up to this point, the conversion of the IF signal has been described as an example and the operation principle has been described. However, as shown in Fig. 9, it is also possible to perform dispersion transmission of the zero IF signal

Since DU uses a Tx signal and an Rx signal as an I / Q signal when transmitting a zero IF signal, it can consume twice as much cable as an IF signal. On the other hand, since the conversion of the Zero IF signal can be implemented using a dedicated chipset and has the advantage of being directly linked to the digital portion of the wireless communication device, the DU can be manufactured at a relatively low cost, The transmission of the zero IF signal can be more optimized than the transmission of the IF signal.

FIG. 15 is a diagram showing the characteristics of a filter used in designing the RU shown in FIG. 14. FIG.

FIG. 15 shows filter characteristics in an RU when a dual band frequency is used in a wireless communication apparatus using an asynchronous TDD scheme.

FIG. 16 is a diagram showing a service frequency allocation when designing an RU using a filter showing the characteristics shown in FIG. 14. FIG.

16, DU according to an embodiment of the present invention combines a wireless communication apparatus using an asynchronous TDD scheme and a dual band frequency using a filter shown in FIG. 14 to provide an optimal service Lt; RTI ID = 0.0 > frequency < / RTI >

17 is a diagram for explaining an apparatus structure and operation principle for transmitting a zero IF signal separated in the signal distributing apparatus according to the present invention.

Referring to FIG. 17, DU may perform impedance matching to enable transmission of an IF signal having an impedance characteristic of, for example, 50 ohms through a data cable having various impedances such as 100 ohms and 200 ohms.

In general, the impedance matching can be performed by an RF converter (Transformer). In the present invention, impedance matching can be performed using Balun (Balanced-to-Unbalanced). Here, the balun is also capable of generating a separate IF signal.

Generally, when connecting the UTP cable and the RJ45 connector, it is possible to remove the resonance component using the non-contact generated by using the pressing method. However, in the present invention, for example, the SMA type RF connector and the UTP cable are directly soldered Resonant component removal can be performed using a separate connector that can be soldered.

18 is a diagram illustrating a process of generating an impedance conversion and a differential signal for transmitting an RF signal from a wireless communication apparatus through a UTP cable and a data cable.

Referring to FIG. 18, an unshielded twisted pair (UTP) cable can be fabricated without shielding for shields of four pairs of cables of eight strands, and can refer to an internet cable. The UTP cable is a twisted pair of eight internal cables, each of which can transmit data through four pairs of twisted cables.

The FTP (Foil Screened Twisted Pair) cable used for data transmission can be fabricated to surround the UTP cable with aluminum foil to protect it from external interference. So it has not been widely used in the past.

STP (Shielded Twisted Pair) cable is the most expensive cable, but it is the most expensive cable because insulator between 4 pairs of cable can minimize interference influence between each cable.

The above UTP, STP, and FTP cables can have the same structure of four pairs of all eight strands for internal data transmission.

Although the UTP cable having the largest number of facilities has been described in the present invention, the FTP cable and the STP cable are equally applicable to the present invention.

The DU according to the present invention can transmit an IF signal or a Zero IF signal to a pair of internal cables. That is, a plurality of different IF signals and zero IF signals may be transmitted in a separate form in four pairs of cables.

UTP cables can be connected to each other using RJ-45 connectors, but resonance problems due to L and C components can occur due to characteristics of RF signal transmission. Accordingly, in the present invention, the resonance problem can be solved by directly soldering the SMA type RF connector and the UTP cable through separate connectors. In the present invention, when using an RJ-45 connector, a special connector may be used in which a core wire in the UTP cable and a RJ-45 connector pin are completely connected. For example, in the present invention, the above-described special connector can be used for the UTP panel shown in FIG.

On the other hand, the IF signal transmitted through the UTP cable can exhibit a characteristic that the loss is small at a low frequency (for example, close to 0 Hz) of the UTP cable and is large at a high frequency (for example, near 100 MHz). Accordingly, in order to make the transmit / receive signal level of each frequency equal, the RF module inside the DU and the RF module inside the RU may further include an equalizer circuit. The equalizer circuit can have a function to set the gain between 0 Hz and 100 MHz proportional to the loss of the UTP cable.

19 is a diagram illustrating an example of a service network for transmitting an RF signal from a Wi-Fi AP to an RU distributed in a service area.

Referring to FIG. 19, a DU according to an embodiment of the present invention distributes an RF reception signal received from a Wi-Fi AP to each RU, thereby expanding a service area, thereby effectively providing an indoor service network for an in- Can be constructed.

Here, the Wi-Fi AP supports 2.4GHz and 5GHz services at the same time, and a large-capacity Wi-Fi AP capable of serving more than 500 users can be used. DU, which is connected to IEEE 802.11ac standard WiFi AP using up to 80MHz band, can be designed with the same design method in DU connected to wireless communication device using synchronous TDD method.

20 is a diagram illustrating another example of a service network that transmits RF signals from a TD-LTE base station to RUs distributed in a service area.

Referring to FIG. 20, a DU according to an embodiment of the present invention can expand a service area by distributing an RF received signal received from a TD-LTE base station to each RU.

FIG. 21 is a diagram illustrating another example of a service network for transmitting an RF signal from a WiBro base station to an RU distributed in a service area.

Referring to FIG. 21, a DU according to an embodiment of the present invention can expand a service area by distributing an RF reception signal received from a WiBro base station to each RU.

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.

22 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. 22, in step 2210, the signal distributor 100 identifies RUs distributed in a service area.

For example, the signal distributor 100 may perform a function of confirming the position and the number of the RUs arranged as a destination for transmitting an IF receiving signal, which will be described later. For example, the signal distributor 100 can identify five RUs arranged on each floor from the first floor to the fifth floor in the 'sky' building.

The signal distributing apparatus 100 of the present invention is connected to a radio communication apparatus to which the TDD scheme is applied, transmits an RF reception signal received from the radio communication apparatus to the RU, and transmits an IF transmission signal transmitted by the RU to the radio communication apparatus Lt; / RTI >

For this purpose, the signal distributing apparatus 100 can confirm the information on the connected wireless communication apparatus, for example, the communication system, the band, the number of the wireless communication apparatuses, the service type, and the like.

In step 2220, the signal distributor 100 allocates communication time to each of the identified RUs.

For example, when the signal distributing apparatus 100 is connected to one wireless communication apparatus or a plurality of wireless communication apparatuses providing the same service, the signal distributing apparatus 100 transmits a signal (hereinafter, referred to as 'RF received signal') received from the wireless communication apparatus Tx time (0 to 1, 2 to 3, 4 to 5 msec) so that the Tx time to be transmitted to the RU and the Rx time to transmit the signal (that is, the IF transmission signal) ), And Rx time (1 to 2, 3 to 4 msec), the communication time can be separately allocated to each of the RUs.

At this time, when the RF reception signal is received from a plurality of radio communication apparatuses providing the same service using the same frequency (for example, 15 to 35 MHz), the signal distributor 100 distributes the Tx time And the Rx time can be assigned to coincide with the respective wireless communication apparatuses.

On the other hand, when the RF signal is received from different kinds of radio communication apparatuses providing different services, for example, TD-LTE and WiBro repeaters, the signal distributor 100 transmits the communication time to each of the radio communication apparatuses As shown in FIG.

In this case, the signal distributing apparatus 100, which will be described later, synchronizes the Tx time and the Rx time in each wireless communication apparatus using a synchronization signal (synchronization signal) for each wireless communication apparatus, The received signals can be combined and transmitted to the corresponding RU.

For example, when the first frequency (2.4 GHz), the signal distributor 100 transmits the communication time, the Tx time (0 to 1, 2 to 3, 4 to 5 msec), the Rx time (1 to 2, 3 (0 to 0.5, 1.5 to 2.5, and 3.5 msec), and the communication time is set to Tx time (0 to 0.5, 1.5 to 2.5, 3.5 to 4.5 msec) To 4.5 msec). At this time, if the Tx time allocated to the first frequency (2.4 GHz) and the Rx time allocated to the second frequency (5 GHz) are partially overlapped as shown in FIG. 4, an interference problem of inter-frequency transmission / reception signals may occur.

Accordingly, the signal distributor 100 determines the Tx time or the Rx time as a time (for example, a hatched portion in FIG. 4) in which the Tx time at each frequency overlaps with the Rx time to determine the interference problem Can be easily solved.

In step 2230, the signal distributor 100 converts the RF received signal received from the wireless network into an IF received signal.

That is, the signal distributor 100 distributes the RF received signals received by radio to the IF receiving signal so as to be transmitted using the wired infrastructure provided in an area (for example, a vertical building) in which the RUs are distributedly arranged Conversion function is performed.

In addition, the signal distributor 100 may include a baseband modem in the wireless communication apparatus that receives the RF reception signal, and a Zero IF signal, which is a type of interlocking signal between the RF unit and the RF unit, IF reception signal or the IF transmission signal.

In step 2240, the signal distributor 100 transmits the IF received signal to the corresponding RU over the wired cable for the allocated communication time.

That is, the signal distributor 100 can transmit an IF reception signal that is differentiated for each RU during communication times of different time zones assigned to RUs using the TDD scheme.

Here, the RUs are connected to each other by a UTP cable for exchanging internet signals and a data cable for data communication, and the signal distributing apparatus 100 transmits the IF receiving signal And an IF transmission signal with the corresponding RU.

For example, the signal distributor 100 transmits an IF receive signal to the RU # 1 over the UTP cable for the allocated Tx time (0 to 1 msec), and transmits the allocated Tx time (0 to 3 msec) to the RU # 2. The signal distributor 100 also receives the IF transmission signal from the RU # 1 over the UTP cable for the allocated Rx time (1 to 2 msec), and transmits the allocated Rx time (3 to 6 msec ) From the RU # 2.

In other words, the signal distributor 100 can support the independent signal transmission without interfering with other RU by exchanging the IF reception signal and the IF transmission signal with the RU in consideration of the communication infrastructure environment surrounding the RU.

In addition, when the RF signal is received from different types of wireless communication devices, the signal distributor 100 divides the wired cable by wireless communication devices and transmits the IF reception signal to the corresponding RU Lt; / RTI >

Also, 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 received signal through the wired cable. Accordingly, the signal distributor 100 can designate and activate a desired specific RU among a plurality of distributed RUs, and can support a synchronization operation for transmission of a stable signal in an activated RU.

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, And transmit the received signal to the corresponding RU. That is, the signal distributor 100 can minimize the signal loss due to the signal dispersion by performing the pre-interfacing operation in order to stably transmit the IF reception signal to each RU.

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:
120: Assignment unit 130:
140: Transmitting / receiving unit 150:
160: Identification unit 170: Distribution unit

Claims (20)

Confirming an RU (Remote Unit) distributed in a service area;
Assigning a communication time to each of the identified RUs;
Converting an RF received signal received from the wireless network into an IF received signal; And
Transmitting the IF received signal to the corresponding RU through the wired cable for the allocated communication time;
Identifying a new RU located outside the service area but connected to the RU by the wired cable; And
Transmitting the IF received signal to the new RU during a communication time allocated to the new RU and extending the service area
≪ / RTI > The method according to claim 1,
When receiving the IF transmission signal from the RU through the wired cable during the communication time,
Converting the received IF transmission signal into an RF transmission signal usable in the wireless network
≪ / RTI > 3. The method of claim 2,
In the signal distribution method,
Determining whether a first frequency when transmitting the IF received signal to the RU and a second frequency when receiving the IF transmitted signal from the RU are the same
Further comprising:
If it is determined that the first frequency and the second frequency are the same,
Wherein the allocating the communication time comprises:
Allocating the communication time in which the Tx time for transmitting the IF reception signal to the RU and the Rx time for receiving the IF transmission signal from the RU do not overlap;
≪ / RTI > The method of claim 3,
If it is determined that the first frequency and the second frequency are not the same,
Wherein the allocating the communication time comprises:
Determining the time for which the Tx time overlaps with the Rx time to be one of the Tx time and the Rx time according to the set condition, when the communication time including the Tx time and the Rx time is allocated
≪ / RTI > The method according to claim 1,
When the RF received signal is received from different types of wireless communication devices,
The step of transmitting the IF received signal to a corresponding RU comprises:
Dividing the wired cable for each wireless communication device and transmitting the IF received signal to the corresponding RU during the allocated communication time
≪ / RTI > The method according to claim 1,
Wherein the allocating the communication time comprises:
Allocating communication time periods different from each other to the RUs using a TDD (Time Division Duplex) scheme;
Lt; / RTI >
The step of transmitting the IF received signal to a corresponding RU comprises:
Transmitting the IF received signal that is differentiated for each RU during the communication time
≪ / RTI > The method according to claim 1,
The RUs are interconnected by a UTP cable for exchanging internet signals and a data cable for data communication,
The step of transmitting the IF received signal to a corresponding RU comprises:
Transmitting the IF received signal through at least one of the UTP cable and the data cable
≪ / RTI > The method according to claim 1,
The step of transmitting the IF received signal to a corresponding RU comprises:
A reference clock for frequency synchronization in a corresponding RU, and a power source for activating the corresponding RU, together with the IF received signal, through the wired cable
≪ / RTI > The method according to claim 1,
Wherein the step of converting into the IF received signal comprises:
Outputting a zero IF signal as an IF received signal, which is a type of interlocking signal between a baseband modem in a wireless communication device that receives the RF received signal and an RF unit that processes and outputs the RF received signal,
≪ / RTI > delete The method according to claim 1,
Transmitting power for start-up to the new RU via the RU in conjunction with expansion of the service area
≪ / RTI > The method according to claim 1,
Performing a connection to the wired cable
≪ / RTI > The method according to claim 1,
The step of transmitting the IF received signal to a corresponding RU comprises:
Performing 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 transmit the IF received signal to the corresponding RU
≪ / RTI > A confirmation unit for confirming an RU distributed in a service area;
An allocation unit allocating a communication time to each of the identified RUs;
A conversion unit for converting an RF received signal received from the wireless network into an IF received signal;
A transmitting / receiving unit for transmitting the IF received signal to a corresponding RU through the wired cable during the allocated communication time; And
An identification unit which is located outside the service area, identifies a new RU connected to the RU by the wired cable,
Lt; / RTI >
The transmitting /
Transmitting the IF received signal to the new RU during a communication time allocated to the new RU,
Signal distributor. 15. The method of claim 14,
When receiving an IF transmission signal from the RU through the wired cable during the communication time in the transceiver,
Wherein,
And converting the received IF transmission signal into an RF transmission signal usable in the wireless network
Signal distributor. 16. The method of claim 15,
The signal distributing device comprises:
A control unit for determining whether a first frequency when transmitting the IF reception signal to the RU and a second frequency when receiving the IF transmission signal from the RU are the same,
Further comprising:
If it is determined that the first frequency and the second frequency are the same,
Wherein the allocating unit comprises:
A Tx time for transmitting the IF received signal to the RU and a communication time for distinguishing the Tx time for receiving the IF transmission signal from the RU
Signal distributor. 17. The method of claim 16,
If it is determined that the first frequency and the second frequency are not the same,
Wherein the allocating unit comprises:
The communication time including the Tx time and the Rx time is allocated and the time when the Tx time and the Rx time overlap is determined as either the Tx time or the Rx time according to the set condition
Signal distributor. 15. The method of claim 14,
When the RF received signal is received from different types of wireless communication devices,
The transmitting /
The wired cable is divided for each wireless communication device, and the IF receiving signal is transmitted to the corresponding RU during the allocated communication time
Signal distributor. 15. The method of claim 14,
Wherein the allocating unit comprises:
A TDD method is used to allocate communication time periods different from each other to the RUs,
The transmitting /
During the communication time, the IF receiving signal separated for each RU is transmitted
Signal distributor. 15. The method of claim 14,
The RUs are interconnected by a UTP cable for exchanging internet signals and a data cable for data communication,
The transmitting /
Transmitting the IF received signal through at least one of the UTP cable and the data cable
Signal distributor.

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