KR100330407B1 - Apparatus for allocating sectors dynamically in a connected base station of optical repeater system for mobile telephone and method thereof - Google Patents

Abstract

According to the present invention, in the installation and operation of a device which is one of the systems for providing a mobile telephone service, a sector can be dynamically designated by a program remotely from a conventional designation of a base station or sector connected to the device only by cable connection. It is characterized by. The base station is composed of a plurality of sectors, and a plurality of optical relay devices may be connected to one base station or sector. In order to reduce the capacity of a sector with high traffic, it is necessary to equalize the distribution of traffic with other sectors when the traffic environment of a certain sector is concentrated, such as a new building or a large number of mobile phone users. The traffic distribution effect can be expected by switching the connected optical relay device to another sector. The present invention dynamically enables connection base station sector switching of such an optical relay device. In addition, the conventional connection of the optical relay device by cable connection has a problem that when the field installation operator connects the optical relay device to a sector other than the predetermined sector, such an error cannot be detected in the repeater network operating system built in the center. Since the present invention can dynamically designate a sector remotely by a program, the designation status is automatically reported so that it is easy to determine whether the initial work is appropriate remotely.

Description

Sector dynamic allocation device and method thereof for access base station of mobile phone optical relay system {APPARATUS FOR ALLOCATING SECTORS DYNAMICALLY IN A CONNECTED BASE STATION OF OPTICAL REPEATER SYSTEM FOR MOBILE TELEPHONE AND METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception system for providing a mobile telephone service. Specifically, the present invention relates to a dynamic allocation of a base station or sector, which can remotely programmatically designate one or more sectors within a base station or a base station connected to an optical relay device. It's about the way.

Transceiver system that provides mobile phone service typically uses a base station and converts the electrical signal of the base station into an optical signal to solve the area of poor call and transmits the converted optical signal to a remote relay device. A mobile telephone optical relay apparatus employing a method of amplifying a signal in a remote relay apparatus and transmitting a signal through an antenna is used.

Such a mobile phone optical relay device physically connects a signal path to an antenna of a base station through a directional coupler or the like, and uses a optical fiber as a communication medium through a master hub unit (MHU) installed at a place where a base station is located. Connected to a remote optic unit (ROU).

When a subscriber attempts to make a call within an area serviced by a remote optical relay system, the optical relay system processes a signal through channel elements of a base station or sector that are physically connected directly.

Conventionally, at the time of installing the optical relay device, a base station or sector connected to the optical relay device is determined, and resources such as channel elements of the base station or sector are distributed and operated with a call in the service area of the optical relay device.

As the use of optical relay devices for mobile phone service expansion is increased, one base station or sector can accommodate a plurality of optical relay devices, and a master hub unit can be configured to accommodate a larger number of remote optical units. If it is necessary to add the MHU physically connected with the base station has a configuration that can be installed only ROU additionally.

Even if two service areas are geographically serially located from the base station location, two strands of fiber optic cables must be installed for each optical signal transmission to the two areas, but one is required to reduce facility costs and facility fees. It uses a technology that combines and transmits two optical relay system signals to an optical fiber.

In the conventional mobile phone optical relay device, base stations and sectors that share resources are determined at the time of installation, and in the future, the base station and sectors to be connected with the optical relay device in order to adjust and distribute the traffic concentration of the base station and each sector may be changed. At this time, there was a problem that the physical connection must be changed at the base station.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method capable of dynamically allocating and changing a base station or sector remotely connected to a mobile telephone optical relay device.

1 is a connection diagram of the RF relay optical relay system of a mobile telephone base station.

2 is a configuration diagram of a mobile telephone optical relay system in a conventional single operation.

3 is a connection diagram of a conventional mobile phone optical relay system.

4 is a block diagram of a conventional mobile phone optical relay system.

5 is a block diagram of a mobile telephone optical relay system using the present invention (MHU).

6 is a block diagram (ROU) of a mobile telephone optical relay system using the present invention.

<Explanation of symbols for main parts of drawing>

501: Master Hub Unit (MHU)

512: frequency converter

514; Combiner (C)

515: divider (S)

516: control signal combiner

517: Electric / Optical Converter (E / O)

518 wavelength division multiplexer (WDM)

601, 602: Remote Optical Unit (ROU)

A feature of the present invention is an optical relay system in which a forward path from a base station to an optical relay device and a reverse path from the optical relay device to the base station are established, the electric relay being installed at the same position as the base station and received from the base station. A master hub unit provided with a control signal for converting a signal into an optical signal and transmitting a frequency corresponding to each of one or more sectors in the base station before transmitting the optical signal; And a remote optical unit located remote from the base station and capable of dynamically changing a sector of the access base station corresponding to the selected frequency by extracting and processing a corresponding frequency component according to a sector designation value of a control signal provided from the master hub unit. It is to provide an optical relay system.

In addition, the sector dynamic allocation device of the access base station of the optical relay system of the present invention comprises a master hub unit and a remote optical unit, and in the optical relay system capable of remotely and dynamically designating one or more sectors in the base station or the base station, one or more sector signals A frequency converter for giving a separate frequency to distinguish each signal with respect to the frequency converter; A combiner for combining each frequency provided from the frequency converter; A divider for branching to provide the combined signal provided from the combiner to a predetermined number of branch ports; An electric / optical converter for converting an electric signal provided from the divider into an optical signal; A wavelength division multiplexer for transmitting a signal provided from the electric / optical converter to the remote optical unit via a fiber optic transmission medium; A control signal combiner between the splitter and the electrical / optical converter, the control signal having a separate sector designation value to the remote optical unit in combination with the signal from the divider to provide to the electrical / optical converter And a master hub unit capable of dynamic allocation.

In addition, the sector dynamic allocation method of the access base station of the optical relay system of the present invention, in the optical relay system in which a forward path from the base station to the optical relay device and a reverse path from the optical relay device to the base station is established, Assigning a separate frequency to distinguish each sector signal with respect to each other; Combining each frequency provided from said frequency converter; Branching the combined signal to a predetermined number of branch ports; Converting the divided electrical signal into an optical signal; Transmitting the converted optical signal to a remote optical unit using an optical fiber as a transmission medium; Prior to performing the electrical / optical conversion step, a control signal having a sector designation that allocates different frequencies to signals of each path to distinguish one or more sector signals in the base station is combined with the divided signals to perform electrical And / light conversion, characterized in that the dynamic allocation of the sector is possible.

Other features, objects, and advantages of the present invention will become apparent from the following detailed description with reference to the accompanying drawings.

Hereinafter, in order to understand the structural features of the present invention, the prior art will be described and the technique of the present invention will be described.

A conventional operation of the mobile telephone optical relay system will be described with reference to FIG. 1.

1 is a connection diagram of an optical relay system in a radio frequency (RF) unit of a base station.

In case of omni-directional communication (OMNI), the base station is composed of one transmission path (Tx) and two reception paths (RxA, RxB), and two reception paths are used to obtain diversity gains. It is connected with 105.

The signal received at each receive antenna 105 is amplified by a Low Noise Amplifier (LNA) 109 via a filter 110, and the transmit antenna 104 is a power amplifier (PA) 111. Is connected to the output side.

When the base station is composed of a plurality of sectors, each of the base station may be represented by an α sector, a β sector, a γ sector, and the like, and each RF sub configuration is the same as in the omnidirectional communication (OMNI) described above.

In order to minimize the impact on the service by the base station itself, the path to the optical relay device is configured through the directional coupler and has a loss of several tens of dB compared to the path in the base station.

In FIG. 1, the path from the α sector of the base station to the optical relay device through the directional couplers 106, 107, and 108 is α_Tx and the receiving paths in the reverse direction are α_RxA and α_RxB.

2 is a block diagram of a conventional mobile phone optical relay system in standalone operation.

The optical relay system is composed of the MHU 201 and the ROU 202 through the optical fiber 220 as a transmission medium. The MHU 201 is installed at the same location as the base station equipment. In the case of the α sector, the MHU 201 is connected to the RF unit α_Tx of the base station shown in FIG. 1 as a forward path and receives a signal provided from the base station. It is connected with α_RxB to transmit the received signal of the remote relay device to the base station. The ROU is installed at a remote location to provide mobile phone service and transmits and receives signals to and from the MHU through optical fiber.

The signal provided from the transmitting side path α_Tx of the base station is provided to the electric / optical converter (E / O) 206 by appropriately adjusting the signal magnitude through the attenuator 204 and the amplifier 205, where a wavelength component such as 1550 nm is provided. It is converted into an optical signal having a and transmitted to the ROU through the optical fiber. A wavelength division multiplexer (WDM) is used in an optical relay system to enable transmission and reception with a single optical fiber by varying wavelengths of a transmission and reception signal. In the WOU 210 and the opto-electric converter 211 of the ROU, the transmitted optical signal is converted into an electrical signal, and the converted signal is amplified to an appropriate size in the high power amplifier (HPA) 215 so that a duplexer (D) ( 216 is transmitted to the transmit antenna. Here, the duplexer has a function of selectively passing each of the transmission frequency and the reception frequency.

The signal provided from the subscribers in the area served by the ROU is received by the two receiving antennas of the ROU, which makes it possible to compensate for the diversity gain by reducing the loss of one path by using two propagation paths. Is to get.

First, the signal received at the antenna connected to the duplexer is provided to the combiner (C) 218 as it is at the receiving frequency f0, and the received signal from another receiving antenna is transmitted to a specific frequency f1 via the frequency converter 219. Is converted to). The combiner 218 combines the two frequency components and provides them to the electrical / optical converter 212, which provides signals to the MHU with a 1310nm optical wavelength component that differs from the optical wavelength of 1550nm at the transmitting side (forward link). The MHU's WDM 203 and the opto-electric converter 207 convert the optical signal provided from the ROU into an RF signal comprising f0 and f1 so that the frequency f0 in one path through the splitter S208. Only the component is filtered and transmitted to α_RxA. In the other path, only the component f1 of frequency is filtered and then converted to f0 and transmitted to α_RxB.

3 is a connection diagram of a conventional mobile phone optical relay device.

In one base station, when the base station is composed of a plurality of sectors, i.e., sectors and sectors γ, as shown in FIG. 1 as the connection point of the optical relay system, the sectors α, β and γ are respectively represented by paths α_Tx, α_RxA and It consists of (alpha) _RxB. Nine signals are connected to the MHU 301 from this path. As illustrated in FIG. 3, the maximum number of branchable ports in the MHU is illustrated as four, and each port is serially connected to ROU1, ROU2, and the like.

The ROU1 302 selectively filters only the corresponding signal among the signals provided from the base station, and converts the signal from the RF unit, and bypasses the signal corresponding to the ROU2 to the ROU2.

4 is a detailed system configuration diagram of the system connection diagram of FIG. 3.

The basic function of the MHU 401 shown in FIG. 4 has four branch ports, and two ROUs are connected to each branch port.

A divider or combiner connected to the port from the base station to connect all four branch ports and two ROUs connected to each branch port to the α sector of the base station has eight branch ports.

In FIG. 4, ROU1 and ROU2 are shown connected with the α sector and the β sector of the base station. The configuration of the forward path is as follows. In order to accommodate up to two ROUs per port, two separate signals must be transmitted on one path, so two frequencies are set separately. As illustrated, the signals of each sector of the base station are converted to f1 and f2 at MHU 401 and combined at combiner 409 and input to electrical / optical converter 410. The converted optical signal is provided to the ROU1 402 via the WDM 411. ROU1 receives this optical signal, converts it into an electrical signal in the optical / electrical converter 413 and branches it through the divider 414, so that the signal in one path selects only the frequency f1 for ROU1 and changes it into an operating frequency. The signal from the other path, which is transmitted to the antenna and the branched path, is converted into an optical signal and transmitted to the ROU2 403. In ROU2, the received optical signal is converted into an electrical signal, and only the frequency f2 is selected and amplified from the frequencies f1 and f2, and then converted into an operating frequency f0 and transmitted through the antenna.

The forward path from the conventional base station to the optical relay device is difficult to change the sector later because the path between the sector in the base station and the corresponding optical relay device is determined when the optical relay device is installed.

On the other hand, the present invention does not change the cable connecting the sector of the base station and the optical relay directly to the sector that needs to be changed, but provides the control signal in which the frequency corresponding to each sector is set separately, thereby providing the sector and the optical relay. The path of and can be changed dynamically.

The configuration of the reverse path from the optical relay apparatus to the base station will be described with reference to FIG. The signal f0 received by the two receiving antennas in ROU2 is converted into f3 and f4 through the frequency converters 420 and 421, respectively, and then converted into an optical signal by the electrical / optical converter 422 and transmitted to ROU1. MHU 401 converts the signal f0 received from two directly connected receiving antennas into f1 and f2, respectively, and converts the signal f0 into an optical signal in the electric / optical converter 415 in combination with the frequency component signals f3 and f4 provided from ROU2. 1 to the reverse subsystem 405. The MHU splits the backward signal into four separate frequency component signals and transmits them to the corresponding sector.

Unlike illustrated, in order to allocate ROU1 and ROU2 to the γ sector of the base station, respectively, the connection indicated by the dotted line in the MHU may be connected to γ_Tx, γ_RxA, and γ_RxB.

Therefore, in order to connect the ROU of the optical relay system to a specific sector of the base station, it is possible to implement through cable operation in the MHU at the time of installation and to change the designated sector in the future, there is a problem that the manual operation must be changed. In addition, there is a problem in that such an error cannot be easily recognized when an operator performs a wrong operation and connects the optical relay system to a sector other than the desired sector.

5 and 6 show the configuration of the mobile telephone optical relay system according to the present invention.

5 and 6, the MHU 501 is illustrated as having four branches and two ROUs for each branch.

The configuration from the base station to the optical relay device, that is, the forward path, is as follows. Each sector signal of the operating frequency f0 is converted to f1, f2 and f3 by the frequency converters 511, 512 and 513, respectively, and provided to the combiner 514 to distinguish between the sectors α, β and γ. In combination with the divider 515, and is quartered in the divider. The branched signal is converted into electrical / light at electrical / optical converter 517 and provided to WDM 518 and then transmitted over a fiber to a remote ROU.

At this time, the MHU provides a control signal for designating the access base station sector of the ROU, which is combined with the signal provided from the divider in a control signal combiner placed in front of the electrical / optical converter 517 to provide electrical / optical light. Provided to the converter. The ROU1 extracts only a specific frequency component from the combined f1, f2, and f3 signals according to the ROU sector designation value in the control signal provided from the MHU, and amplifies and sends it to the antenna. If α, β, and γ sectors are assigned to f1, f2, and f3, respectively, and only R1 is connected to the α sector, only the f1 signal will be selectively selected. Likewise, if ROU2 is designated as γ sector, ROU2 will select and amplify only f3 of the various frequency components. In each ROU, the frequency converter operates according to a control signal provided from the MHU to select frequency components.

The configuration of the path from the ROU2 to the base station, that is, the reverse path, is as follows. f1, f2 or f3, f4 or f5, f6 may be allocated to separately process the received signals f0 for the α, β and γ sectors. If ROU2 is specified as γ, the two received signals in the reverse direction are sent to the MHU in combination with the f5 and f6 signal components, respectively. The MHU has a filter so that only the frequencies allocated for each sector are selected in each path.

Control signals for connecting ROU1 and ROU2 to a particular sector are sent in the forward path and provided between the splitter and the optical / electrical converter in the MHU. This control signal is sent from the central monitoring center, etc., to easily change the optical relay system connected to the traffic concentration sector to another sector not only during initial installation but also in case of traffic concentration in the base station sector in the future. Can be accommodated.

According to the present invention, when the traffic environment of a particular sector changes, that is, when a new building is erected or there are many mobile telephone users and traffic is concentrated, the traffic distribution with other sectors needs to be equalized. The traffic distribution effect can be expected by switching the connected optical relay device to designate another sector in order to reduce the capacity.

In addition, since sector allocation is possible remotely and dynamically, the effect of reducing work time and cost is remarkable compared to when manual work is performed when a sector is changed.

Conventional cable connection by optical cable connection has a problem in that when the field installation worker connects the optical relay device to a sector other than the scheduled sector, such an error cannot be detected by the repeater network operating system built in the center. The invention allows for the dynamic designation of sectors remotely by program, so that the designation status is automatically reported so that it is easy to know whether the initial work is appropriate remotely.

In addition, by utilizing the dynamic sector allocation function of the optical relay system in the remote monitoring system, it is possible to easily identify the base station sector connected to the remote optical relay system automatically.

Claims (6)

An optical relay system in which a forward path from a base station to an optical relay device and a reverse path from the optical relay device to the base station are established. A master hub unit installed at the same position as the base station, converting the electric signal and the control signal received from the base station into an optical signal and transmitting the optical signal; A remote optical unit located remote from the base station, converting an optical signal transmitted from the master hub unit to extract a control signal, and dynamically changing a sector using the control signal; The control signal of the master hub unit is a signal designating a connection base station sector of the remote optical unit, wherein the remote optical unit detects a designated sector from the control signal, and only a frequency component corresponding to the detected sector An optical relay system capable of remotely and dynamically designating a base station or a sector within the base station, characterized in that the process is selected and processed. The method of claim 1, wherein the master hub unit, A frequency converter 512 for assigning a separate frequency to distinguish each signal from signals transmitted from one or more sectors; A combiner 514 for combining the respective frequencies provided by the frequency converter 512; A divider (515) for branching to provide the combined signal provided from the combiner (514) to a predetermined number of branch ports; An electrical / optical converter (517) for converting an electrical signal provided from the divider (515) into an optical signal; A wavelength division multiplexer (518) for transmitting the signal provided from the electric / optical converter (517) to the remote optical unit via optical fiber; Located between the divider 515 and the electrical / optical converter, a control signal having a sector designation specifying a sector of a remote optical unit is combined with the signal from the divider to provide to the electrical / optical converter 517. Control signal combiner (516) Optical relay system, characterized in that the dynamic allocation of the sector by having a. The access base station according to claim 2, wherein the remote optical unit extracts only a specific frequency component from the combined frequency signal according to a sector designation value of the control signal provided from the master hub unit and transmits it through an antenna. Optical relay system, characterized in that the path with the sector can be set dynamically. A sector dynamic allocation method of an access base station in an optical relay system in which a forward path from a base station to an optical relay device and a reverse path from the optical relay device to the base station are established. Assigning a separate frequency to each sector signal for at least one sector signal; Combining each of the given frequencies; Branching the combined signal to a predetermined number of branch ports; Converting the divided electrical signal into an optical signal; Transmitting the converted optical signal to a remote optical unit using an optical fiber as a transmission medium; Prior to performing the electrical / optical conversion step, a control signal having a sector designation that allocates different frequencies to signals of each path to distinguish one or more sector signals in the base station is combined with the divided signals to perform electrical And dynamic conversion of the sectors, including the step of converting / lighting. The method of claim 4, further comprising extracting only a specific frequency component from the combined frequency signal according to a sector designation value of the control signal provided from the master hub unit to the remote optical unit to dynamically set a path with the corresponding sector. Sector dynamic allocation method of the access base station of the optical relay system, characterized in that it comprises a. 5. The method of claim 4, wherein the providing of the control signal is performed in a master hub unit installed at the same location as the base station.