KR20090123439A - Remote relay system using cascade method - Google Patents

Abstract

PURPOSE: A remote relay system using a cascade mode is provided to reduce the length of a system installation cable by connecting ERUs(Extended Remote Unit) and EHUs(Extended Hub Unit) in the cascade mode. CONSTITUTION: A master unit(130) converts an optical or RF(Radio Frequency) signal into a forward direction digital signal, and transmits the forward digital signal. The master unit converts a backward digital signal into the optical signal or RF signal, and transmits the optical or RF signal. A plurality of EHUs(140) receive the forward direction digital signal. The EHUs distribute the received signal to a plurality of remote repeater units(150).

Description

Remote relay system using multi-stage transmission method {REMOTE RELAY SYSTEM USING CASCADE METHOD}

The present invention relates to a remote relay system, and more particularly, to a remote relay system using a multi-stage transmission method for connecting an expansion hub unit of a repeater using gigabit Ethernet communication in a cascade manner.

In general, a repeater is used to improve the call quality and coverage of the base station, which is difficult to reach, or the radio wave blocking area due to the feature.

For in-building repeaters, a master unit, for example, an extended master hub unit (EMHU) and a remote relay unit, for example, a remote unit (RU) repeater are wired to each other, and maximum for gigabit Ethernet communication. Since the reachable distance is less than 100 [m], an extended hub unit that amplifies digital signals in the middle, for example, requires an extended hub unit (EHU).

Looking at the connection method of the remote relay system according to the prior art, EMHU transmits and receives a digital signal in a star structure that is connected one-to-one with the EHU and RU.

In this star structure, the length of the cable for connecting the EMHU and the plurality of EHUs is increased because the EMHU is connected to each EHU, and the number of RUs capable of remote relay service is limited due to the limited number of ports of the EMHU.

An object according to an embodiment of the present invention, which was created to solve the above problems, is required to install a system by connecting a cascading system in series between expansion hub units connected to a remote relay unit. It is to provide a remote relay system using a multi-stage transmission method that can reduce the length of the cable.

Another object of the present invention is to provide a remote relay system using a multi-stage transmission method that can increase the number of remote relay units that can be used in connection with a master unit.

In order to achieve the above object, a remote relay system according to an aspect of the present invention is a remote relay system for gigabit Ethernet communication, the optical signal received from the optical repeater or RF (radio frequency) signal received from the base station forward digital A master unit for converting the signal into a signal and transmitting the received reverse digital signal to an optical signal and transmitting the optical signal to the optical repeater or the RF signal to the base station; And receiving and forwarding the forward digital signal transmitted from the master unit to a plurality of remote relay units directly connected thereto, and adding the reverse digital signals received from the plurality of remote relay units to transmit to the master unit. Including an expansion hub unit, the plurality of expansion hub unit may be connected in series with each other.

Furthermore, the expansion hub unit receives and transmits the forward digital signal to the first neighboring expansion hub unit and the plurality of remote relay units that are directly connected, and transmits the first neighboring expansion hub unit and the plurality of remote relay units. In addition, the reverse digital signal received from the second neighbor extension hub unit and the master unit can be directly transmitted.

In this case, the master unit, the expansion hub unit and the remote relay unit may be connected to each other by a UTP cable.

Further, the expansion hub unit receives and transmits the forward digital signal to a plurality of neighbor expansion hub units directly connected thereto, and adds reverse digital signals received from the plurality of neighbor expansion hub units to another neighbor directly connected. One of the expansion hub unit and the master unit can be transmitted.

According to another aspect of the present invention, a remote relay system includes a remote relay system for gigabit Ethernet communication, comprising: an RF repeater for transmitting and receiving an RF signal wirelessly with a base station; A master unit converting the RF signal received from the RF repeater into a forward digital signal, and converting the received reverse digital signal into an RF signal and transmitting the RF signal to the RF repeater; And receiving and forwarding the forward digital signal transmitted from the master unit to a plurality of remote relay units directly connected thereto, and adding the reverse digital signals received from the plurality of remote relay units to transmit to the master unit. Including an expansion hub unit, the plurality of expansion hub unit may be connected in series with each other.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, a remote relay system using a multi-stage transmission method according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

1 is a block diagram of a remote relay system using a multi-stage transmission method according to an embodiment of the present invention.

Referring to FIG. 1, a remote relay system includes a master unit 130, an expansion hub unit 140, and a remote relay unit (ERU) 150.

The master unit 130 receives an optical signal from an optical repeater 110 connected by an optical cable or receives an RF signal from a base station or an RF repeater 120 and converts the received optical signal or RF signal into an optical signal or an RF signal. (Hereinafter, referred to as a "forward digital signal"), the distributed forward digital signal is distributed to the expansion hub unit 140 or the remote relay unit 150 connected to the master unit 130 and transmitted.

Here, the master unit 130 may be an extended master hub unit (EMHU), the extended hub unit 140 may be an extended hub unit (EHU), and the remote relay unit 150 may be an extended remote unit (ERU).

In addition, when the master unit 130 receives a digital signal (hereinafter referred to as a "reverse digital signal") from the expansion hub unit 140 or the remote relay unit 150, the master unit 130 adds the received reverse digital signal and then receives an optical signal or an RF signal. The signal is converted into a signal, the converted optical signal is transmitted to the optical repeater 110, and the converted RF signal is transmitted to the base station or the RF repeater 120.

In this case, the master unit 130 may include a plurality of ports for connecting with the expansion hub unit 140 or the remote relay unit 150.

The expansion hub unit 140 is a plurality of remote relay units connected to the master unit 130 in a cascade manner in which a plurality are connected in series and directly connected by receiving a forward digital signal transmitted from the master unit 130. And other expansion hub units (hereinafter referred to as " neighbor expansion hub units ") for transmission.

In addition, the expansion hub unit 140 receives a reverse digital signal transmitted from each of a plurality of directly connected remote relay units and a reverse digital signal transmitted from the first neighboring expansion hub unit, and adds the master unit and the second neighboring expansion hub unit. Send to either.

For example, the expansion hub unit directly connected to the master unit 130 adds a reverse digital signal received from a neighbor expansion hub unit and a reverse digital signal received from at least one remote relay unit directly connected to the master unit 130.

As another example, the expansion hub unit connected to the first neighboring expansion hub unit and the second neighboring expansion hub unit may include a reverse digital signal received from the first neighboring expansion hub unit and a reverse digital signal received from at least one remote relay unit connected directly. The signal is added and transmitted to the second neighboring expansion hub unit.

Of course, the reverse digital signal received from the first neighboring expansion hub unit is the sum of the reverse digital signal received from the neighboring expansion hub unit and the reverse digital signal received from the at least one remote relay unit directly connected to the first neighboring expansion hub unit. will be.

In this case, the positions of the first neighboring expansion hub unit and the second neighboring expansion hub unit may be interchanged.

The remote relay unit 150 is connected to the master unit 130 or the expansion hub unit 140, receives the forward digital signal transmitted from the master unit 130 or the expansion hub unit 140, converts it into an RF signal, and then antennas. Through the transmission, the RF signal received through the antenna is converted into a reverse digital signal and transmitted to any one of the master unit 130 and the expansion hub unit 140.

Master unit 130, expansion hub unit 140 and remote relay unit 150 shown in Figure 1 is preferably interconnected via a UTP cable.

As described above, in the remote relay system according to an embodiment of the present invention, unlike the star-type structure in which the remote relay system using the conventional gigabit Ethernet communication is connected to the master unit and the expansion hub unit one-to-one, a plurality of expansion hub units are mutually connected. Using a multi-stage transmission scheme connected in series, the number of remote relay units that can be connected to the master unit can be increased, and facility costs can be reduced by reducing the length of cables required to install the remote relay system.

In addition, since the remote relay system according to an embodiment of the present invention can connect a plurality of expansion hub units in series by a multi-stage transmission method, the number of ports provided in the master unit 130 may be adjusted, and expansion may be necessary as needed. The number of ports of the hub unit can be adjusted, thereby reducing the manufacturing cost of the master unit 130.

In an embodiment of the present invention illustrated in FIG. 1, in order to increase the number of remote relay units that may be connected to the master unit, a plurality of expansion hub units are connected in a multi-stage transmission scheme, but the present invention is not limited thereto. It is also possible to mix the structure of, which will be described with reference to FIG.

2 is a block diagram of a remote relay system using a multi-stage transmission method according to another embodiment of the present invention.

Here, for the convenience of description, the configuration of the optical repeater 110, the base station or the RF repeater 120 connected to the master unit 130 is omitted.

Compared with the remote relay system shown in FIG. 1, the remote relay system shown in FIG. 2 has a multistage transmission scheme structure in which a plurality of expansion hub units 140 are connected in series with each other, and a plurality of expansion hub units have a specific expansion hub. It can be seen that there is a mixture of star-type structures that are connected one-to-one with the unit.

Here, the star structure may be used where the length of the cable used is smaller than when using the multi-stage transmission structure.

That is, although the multi-stage transmission scheme is used through the expansion hub unit 140 directly connected to the master unit 130, a plurality of expansion hub units are required in a specific space, and the expansion hub unit is a multi-stage transmission scheme in the specific space. If it is possible to reduce the cable length required to configure the expansion hub unit in a star structure rather than to form a structure, it is possible to connect a plurality of expansion hub units in a star structure in that specific space.

In the remote relay system as shown in FIG. 2, the operation of the expansion hub unit 140 will be described. The expansion hub unit 140 receives at least one forward digital signal transmitted from the master unit 130 or the neighbor expansion hub unit. Distributed to the remote relay unit 150 and the at least one neighboring expansion hub unit and transmitted, and the master unit 130 by adding a reverse digital signal transmitted from at least one remote relay unit and at least one neighboring expansion hub unit directly connected. ) And any other neighboring expansion hub unit that is directly connected.

For example, when the expansion hub unit 140 is connected to the master unit 130 and connected to a neighboring expansion hub unit in a multistage transmission manner, the expansion hub unit transmits a forward digital signal transmitted from the master unit to the expansion hub unit. It is distributed to a plurality of remote relay units 150 and neighboring expansion hub units which are connected to each other.

In addition, the expansion hub unit 140 adds reverse digital signals transmitted from the neighbor expansion hub unit and the plurality of remote relay units 150 and transmits them to the master unit 130.

This case is a description of a case in which the expansion hub unit is connected in the same way as the expansion hub unit shown in FIG. 1, and a case in which a plurality of expansion hub units are connected to the expansion hub unit in a star structure is as follows.

Herein, the expansion hub unit 140 receives a forward digital signal from the first neighboring expansion hub unit, and it is assumed that the plurality of remote relay units and the second to fifth neighboring expansion hub units are connected in a star structure.

The expansion hub unit 140 distributes the forward digital signal received from the first neighboring expansion hub unit to the plurality of remote relay units 150 and the second to fifth neighboring expansion hub units connected in a star structure.

Similarly, the expansion hub unit 140 receives reverse digital signals transmitted from the second to fifth neighboring expansion hub units and the plurality of remote relay units, and adds them to the first neighboring expansion hub unit.

As described above, the remote relay system according to an embodiment of the present invention has no loss on the line because the signal is transmitted digitally from the master unit 130 to the remote relay unit, and the expansion hub unit is connected in a multi-stage transmission system. Not only reduces the complexity, but also facilitates the operation of the equipment.

3 is a block diagram illustrating an exemplary embodiment of the expansion hub unit illustrated in FIGS. 1 and 2, and includes an adder 320, a distributor 350, a plurality of filters 330 and 360, and a plurality of duplexers 310 and 340. It can be seen that it includes).

Here, assuming that the duplexer receiving the forward digital signal is the first duplexer 310 and the remaining duplexers 340 are the second to Nth duplexers, the expansion hub unit 140 has the number of ports for transmitting the forward digital signal ( N-1), and the number of filters for digitally filtering the forward digital signal and the reverse digital signal according to the number of ports is also (N-1).

In the present invention, since the expansion hub unit is connected in a multi-stage transmission scheme, the number of ports may be appropriately adjusted according to the expansion hub unit manufacturing price and the number of remote relay units. That is, the number of filters and the number of duplexers can be adjusted.

The adder 320 performs a function of adding a reverse digital signal digitally filtered by the plurality of filters 330 and outputting the reverse digital signal to the first duplexer 310, and the distribution unit 350 receives the first duplexer 310. A function of distributing the forward digital signal to the plurality of filters 360 is performed.

In this case, the plurality of filters 330 connected to the adder 320 and the plurality of pulters 360 connected to the distribution unit 350 may be the same filter, and the second to Nth duplexers 340 may also have the same duplexer. Can be.

The remote relay system using the multi-stage transmission method according to the present invention can be modified and applied in various forms within the scope of the technical idea of the present invention and is not limited to the above embodiments. In addition, the embodiments and drawings are merely for the purpose of describing the contents of the invention in detail, not intended to limit the scope of the technical idea of the invention, the present invention described above is common knowledge in the technical field to which the present invention belongs As those skilled in the art can have various substitutions, modifications, and changes without departing from the spirit of the present invention, it is not limited to the embodiments and the accompanying drawings. And should be judged to include equality.

1 is a block diagram of a remote relay system using a multi-stage transmission method according to an embodiment of the present invention.

2 is a block diagram of a remote relay system using a multi-stage transmission method according to another embodiment of the present invention.

3 is a diagram illustrating an embodiment of the expansion hub unit illustrated in FIGS. 1 and 2.

<Explanation of symbols for main parts of the drawings>

130: master unit

140: expansion hub unit

150: remote relay unit

Claims (5)

In the remote relay system for Gigabit Ethernet communication, Converts and transmits an optical signal received from an optical repeater or an RF (radio frequency) signal received from a base station to a forward digital signal, and converts the received reverse digital signal into an optical signal and transmits it to the optical repeater or an RF signal A master unit for transmitting to the base station; And A plurality of extensions for receiving and forwarding the forward digital signal transmitted from the master unit to a plurality of remote relay units connected directly, and adding the reverse digital signals received from the plurality of remote relay units to the master unit; Including a hub unit, And the plurality of expansion hub units are connected in series with each other. The method of claim 1, The expansion hub unit Receiving and forwarding the forward digital signal to the first neighboring extension hub unit and the plurality of remote relay units that are directly connected, and receiving a reverse digital signal received from the first neighboring extension hub unit and the plurality of remote relay units. In addition, the remote relay system for transmitting to any one of the second neighbor expansion hub unit and the master unit directly connected. The method of claim 1, The master unit, the expansion hub unit and the remote relay unit Remote relay system connected by mutual UTP cable. The method of claim 1, The expansion hub unit Receiving and forwarding the forward digital signal to a plurality of neighboring expansion hub units directly connected thereto, and adding another reverse digital signal received from the plurality of neighboring expansion hub units to directly connect the other neighboring expansion hub units and the master unit. Remote relay system that transmits to either. In the remote relay system for Gigabit Ethernet communication, An RF repeater for transmitting and receiving an RF signal wirelessly with a base station; A master unit converting the RF signal received from the RF repeater into a forward digital signal, and converting the received reverse digital signal into an RF signal and transmitting the RF signal to the RF repeater; And A plurality of forward digital signals received from the master unit are distributed to a plurality of remote relay units connected directly to each other, and transmitted to the master unit by adding reverse digital signals received from the plurality of remote relay units. Including expansion hub units, And the plurality of expansion hub units are connected in series with each other.

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