KR20030033824A - System for monitoring and controlling of Mobile Communication Base Station - Google Patents

Abstract

PURPOSE: A remote monitoring and RF(Radio Frequency) distributing system of a mobile communication base station is provided to install a BSC(Base Station Controller) and an RF device separately at indoor and outdoor places, while installing the BSC at a currently secured place, so as to install an additional BSC regardless of places. CONSTITUTION: RF devices(150a-150n) or optical repeaters(160a-160n) installed at an outdoor place perform low noise amplification and modulation for corresponding wireless signals, to transceive the signals. A donor interface(130) mutually connected to the RF devices(150a-150n) or optical repeaters(160a-160n) converts RF signals into optical signals, and divides the converted signals into TX, RX0 and RX1 by FAs(Frequency Assignments) to output the divided signals. An up/down converting part(120) connected to the donor interface(130) through an RF cable combines transceiving signals by FAs outputted from the donor interface(130) to multi-FA signals for being converted into IFs(Intermediate Frequencies). And a BSC(110) receives signals outputted from the up/down converting part(120) to control devices in an identical cell of a transceiving control station.

Description

System for monitoring and controlling of Mobile Communication Base Station}

The present invention relates to a remote monitoring and RF distribution system of a wireless base station. In particular, a base station controller (BSC) is installed in a space secured in the presently secured space, and the RF devices are remotely distributed anywhere on the roof of a building, an adjacent building, and the ground. The present invention relates to a remote monitoring and RF distribution system of a mobile communication base station, which can be installed without regard to the location of the building underground even when the base station controller is additionally installed.

In multiple mobile communication systems such as cellular cellular, PCS, GSM, IMT-2000 or TRS, radio wave emission has an integrated base transceiver station (BTS) in a tower such as indoor or building roof. It is installed together with, and the interval between the transceiver station (BTS) and the antenna is laid by several tens of meters to 150m by the number of antennas using coaxial cable of 7/8 "or 1 / ½" standard.

In addition, a separate RF repeater is installed to solve the shadow area of radio waves, and a donor unit (or master unit) for interfacing with a transceiver (BTS) installed indoors is installed in a room together with the transceiver (BTS). After converting the RF signal into an optical signal, the optical signal is transmitted to an optical repeater (Remote or Slave) installed at a remote location through an optical cable, and the optical signal is converted back to an RF signal to propagate in a space.

The opposite receiving path is also performed in the same manner as above.

In particular, the indoor and outdoor devices of the base station equipment is the limit that must be installed in the same place, there is a big difficulty in equipment installation, cable laying and securing the place, the increase in rental costs can also be called a big burden.

In addition, only one shaded area per BTS can be resolved.

Since the base station controller (BSC) and the RF device of the base station device must be installed in the same area, it is difficult to select due to constraints such as the height of the building, the location of the station, the load, the area, and the lease conditions, and the cost increase factor.

The new communication requires the installation of at least four times more base stations or transceivers (BTSs) than the current one, and securing the installation space is the biggest challenge.

Therefore, the base station controller (BSC) is installed in the currently secured space, and the RF devices are remotely distributed and installed anywhere on the building roof, adjacent buildings, and the ground. Implementing a system that can be installed without this is urgent.

In addition, as the frequency of use increases and the capacity increases, a problem arises that the diameter of the coaxial cable becomes large in order to increase the number of antennas (18 to 24 units in 6 sectors) and to reduce transmission loss.

As a result of this, various problems such as an increase in cable cost, an increase in facility construction cost, aesthetics of the building and environmental damage, and an increase in the difficulty of the construction method have arisen.

Accordingly, an object of the present invention is to separately install the base station controller (BSC) and the RF device of the base transceiver station (BTS) indoors and outdoors, respectively, the base station controller ( By installing the base station controller (BSC) and remotely distributing the RF devices anywhere on the roof of the building, adjacent buildings, and the ground, the mobile communication base station can be installed regardless of the location of the building underground even when the base station controller is additionally installed. To provide a remote monitoring and RF distribution system.

1 is a diagram schematically illustrating a mobile communication base transceiver station;

2 is a detailed block diagram illustrating the donor interface of FIG. 1 according to an embodiment of the present invention;

3 is a detailed block diagram illustrating the RF device of FIG. 1 according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

100: transmission and reception control station 110: base station controller (BSC)

120: up-down conversion unit 130: donor interface (DIS)

131: DRU 133: BOCU

135: ROCU 137: BMU

150: RF device 160: optical repeater

Technical means of the present invention for achieving the above object, the base station controller, the RF device and the optical repeater in a mobile communication base station installed in the indoor and outdoor: a low noise amplification and modulation of the radio signal installed in the outdoors and transmit and receive An RF device or an optical repeater; A donor interface connected to the RF device or the optical repeater installed outdoors to convert an RF signal into an optical signal and output the separated TX, RX0, and RX1 signals for each FA; An up-down converter connected to the donor interface and an RF cable and combining the FA-transmitted / received signals output from the donor interface into a multi-FA signal and converting them into an intermediate frequency; And a base station controller which receives a signal output from the up-down conversion unit and controls devices in the same cell of the transmission / reception control station.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 schematically illustrates a mobile communication base transceiver station, and includes a base station controller 110, an up-down converter 120, a donor interface 130, and an RF control unit 150-150n. And optical repeaters 160 to 160n.

The donor interface 130, the up-down converter 120, and the base station controller 110 are installed indoors, and the RF devices 150-150n and the optical repeaters 160-160n are preferably installed outdoors.

The donor interface 130 is connected to an RF device 150 to 150n or an optical repeater 160 to 160n installed outdoors to convert an RF signal into an optical signal to transmit a transmission channel TX and a reception channel RX0 for each FA. It is configured to separate and output to the RX1) signal, the donor interface 130 can accommodate a plurality of remote RF devices (150-150n) and / or a plurality of optical repeaters (160-160n).

In addition, the up-down conversion unit 120 is connected to the donor interface 130 and the RF cable, and is configured to combine the FA transmission and reception signals output from the donor interface 130 into a multi-FA signal and to convert to an intermediate frequency (IF) The base station controller 110 is configured with a processing circuit and a memory to receive the signals output from the up-down conversion unit 120 to control all devices in the same cell of the transmission and reception control station 100.

The RF devices 150-150n and the optical repeaters 160-160n are installed outdoors and are configured to transmit and receive voice signals with other repeaters or personal mobile communication terminals after low noise amplification and modulation of the radio signals.

That is, the transmission and reception control station 100 composed of the base station controller 110 (BSC), the up-down conversion unit 120, and the donor interface 130 is installed indoors, and the low noise amplifier 154 shown in FIG. RF repeater consisting of a power amplifier 153 (Linear Power Amp), Front End Unit (FEU), Remote Base Station Management System (RBMS) 156, and filter 155, and a separate optical repeater for expansion 160 to 160n are installed outdoors such as on the roof of a building.

In addition, between the transmission and reception control station 100 and the RF device 150 to 150n, the donor interface 130 converts the RF signal into an optical signal and transmits the signal, and then the RF device 150 to 150n and the optical repeater 160 to 160n. The uplink signals of the respective RF devices 150 to 150n and the optical repeaters 160 to 160n are multiplexed at the donor interface 130 to be reconverted to the RF signals. Is sent.

In order to satisfy the various functions of the receiver, two received signals are separated into multi-wavelength light so that two received signals can be dual-transmitted.

FIG. 2 is a detailed block diagram illustrating the donor interface of FIG. 1 according to an embodiment of the present invention, and includes a donor RF unit 131, a base station optic coversion unit (BOCU) 133, and a remote optic conversion unit (ROCU). 135 and a base station management unit (BMU) 137.

The donor interface 130 is connected to the up-down conversion unit 120 by an RF cable for each sector, and separates TX, RX0, and RX1 signals for each FA, and transmits and receives signals for each FA of the up-down conversion unit 120. The donor RF unit 131 which combines and transmits the multi-FA signal, and converts the RF signal of the donor RF unit 131 into an optical signal and transmits it to each RF device 150-150n or each RF device 150-150n. BOCU 133 for converting the optical signal transmitted from the RF signal to the donor RF unit 131, and converts the RF signal of the donor RF unit 131 into an optical signal optical repeater (160 ~ 160n) ROCU 135 for transmitting to the donor RF unit 131 by converting the optical signal transmitted from each repeater to the RF signal 131, and the RBMS of each of the RF device (150 ~ 150n) and the optical repeater (160 ~ 160n) RF status monitoring and database changes, including device fault alerts, channel power, and VSWR (Voltage Standing Wave Ratio). , It consists of a (Base StationManagement System) for controlling the BMS, such as ON / OFF.

The donor interface 130 is divided into sectors and is installed in the transmission / reception control station 100 in total, three sectors, or up to six sectors.

N remote RF devices 150 to 150n and n optical repeaters 160 to 160n per donor interface 130 may be accommodated, and the donor RF unit 131 may include a sector-specific up-down converter 120 and an RF cable. It is separated into transmission channel (TX) and reception channel (RX0, RX1) signal for each FA.

The FA transmission / reception signal of each up-down converter 120 is combined and transmitted as a multi-FA signal, or the signals transmitted / received by the BOCU 133 and the ROCU 135 are transmitted to each up-down converter 120.

The BOCU 133 converts the RF signal of the donor RF unit 131 into an optical signal and transmits it to each RF device 150 to 150n of the transmission / reception control station 100 or the light transmitted from each RF device 150 to 150n. The signal is converted into an RF signal and transmitted to the donor RF unit 131.

At this time, the signal is transmitted separately as a TX signal and a BMS signal for RX0, RX1, remote monitoring and control of reception diversity.

The ROCU 135 converts the RF signal of the donor RF unit 131 into an optical signal and transmits it to the optical repeaters 160 to 160n or converts the optical signal transmitted from each repeater into an RF signal to the donor RF unit 131. send.

At this time, the signal is also transmitted separately as TX, RX0, RX1, BMS signal.

A plurality of optical repeaters (160 to 160n) can be implemented in a multi-drop method, and the optical signal using optical wave division multiplexing.

The BMU 137 monitors the failure of the device, RF power such as channel power, VSWR, etc., and changes the database through the RBMS 156 of each of the RF devices 150-150n and the optical repeaters 160-160n. Etc. can be controlled. This information and control is connected via the base station controller 110 and transmitted to a central monitoring device such as a mobile switching center (MSC).

3 is a detailed block diagram illustrating the RF device of FIG. 1 according to an embodiment of the present invention, a RBOCU (Remote BOCU) 151, a RRU (Remote RF Unit) 152, a low power amplifier 153 (LPA), Low noise amplifier 154 (LNA), filter 155, RBMS 156, power supply 157, cooling enclosure and the like.

The RBOCU 151 reversely converts an optical signal between the BOCU 133 into an RF signal and transmits the converted RF signal to the RRU 152, and converts the RF signal of the RRU 152 into an optical signal and transmits the optical signal to the BOCU 133.

The RRU 152 separates and transmits RF signals to TX, RX0, and RX1 to propagate or receive antennas (RX0, RX1) and filters 155 in space through respective LPAs 113, filters 155, and antennas TX. ) Through the low noise amplifier 154.

A power supply unit 157 for supplying power and an RBMS 156 interworking with the base station controller 110 and a power unit for each important part are embedded for operation state monitoring, fault monitoring, and operation database control. You can also install a separate backup battery.

The optical repeaters 160 to 160n may be configured as single or multiple drops in one optical core.

The enclosure of the unit is a 19 'rack type enclosure with a cooler function with a built-in temperature control system.

The power source can be remotely fed from the base station controller 110 power supply in the same building. In the case of the remote RF device 150 to 150n, a separate power supply is required.

In addition, an RBMS 156 for monitoring and diagnosing faults of the remote RF devices 150 to 150n and RF characteristics such as unwanted waves, VSWR, and RF spectrum may be embedded to control, monitor, and measure.

In order to distribute the electric field evenly in the service area, it may be distributed and installed in remote buildings or remotely by the RF devices 150-150n or optical repeaters 160-160n.

While specific embodiments of the present invention have been described and illustrated above, it will be apparent that the present invention may be embodied in various modifications by those skilled in the art. Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

Accordingly, in the present invention, the base station controller and the RF device of the mobile communication transceiver station (BTS) are installed separately indoors and outdoors, but the base station controller is installed in the currently secured space. By remotely distributing RF devices anywhere on the ground, the base station controller can be installed in the existing narrow space and can be installed regardless of buildings such as underground buildings. Can be saved.

In addition, the RF device can be installed regardless of the place conditions such as building roof, indoor, roof of adjacent building, and ground structure, so it is easy to secure the place and can be installed with low rent cost by utilizing the rooftop. Since it is easy to disperse | distribute to, the favorable radio wave quality can be ensured.

In addition, by reducing the PIM (Passive Inter Modulation) which increases at the high frequency due to the shortening of the cable length, mutual intermodulation can be reduced, and the cable purchase cost and construction cost can be reduced by shortening the installation length of large diameter coaxial cable. In addition, the coaxial cable length can be reduced to reduce power loss.

Claims (5)

In the mobile communication base station to install the base station controller, the RF device and the optical repeater indoor and outdoor: An RF device or an optical repeater installed outdoors to transmit and receive a low noise amplification and modulation of the radio signal; A donor interface connected to the RF device or the optical repeater installed outdoors to convert an RF signal into an optical signal and output the separated TX, RX0, and RX1 signals for each FA; An up-down converter connected to the donor interface and an RF cable and combining the FA-transmitted / received signals output from the donor interface into a multi-FA signal and converting them into an intermediate frequency; And And a base station controller configured to receive a signal output from the up-down converter and control devices in the same cell of a transmission / reception control station. The method according to claim 1, The donor interface, the up-down converter and the base station controller are installed indoors, the remote monitoring and RF distribution system of the mobile communication base station. The method according to claim 1, The donor interface, A remote monitoring and RF distribution system of a mobile communication base station, characterized in that it can access and accommodate a plurality of remote RF devices and / or a plurality of optical repeaters. The method according to claim 1, The donor interface, A donor RF unit connected to each of the up-down converters by an RF cable, separating the TX, RX0, and RX1 signals for each FA, and combining and transmitting the FA transmission / reception signals for each FA into a multi-FA signal; A BOCU that converts the RF signal of the donor RF unit into an optical signal and transmits it to each RF device or converts an optical signal transmitted from each RF device into an RF signal and transmits the RF signal to a donor RF unit; An ROCU converting an RF signal of the donor RF unit into an optical signal and transmitting the optical signal to an optical repeater or converting an optical signal transmitted from each repeater into an RF signal and transmitting the RF signal to a donor RF unit; And Remote BMS of the mobile communication base station, characterized in that the BMS for controlling the RF status monitoring, database change, on / off, etc. of the failure alarm, channel power, VSWR of the device through the RBMS of each RF device and optical repeater Surveillance and RF Distributed System. The method according to claim 4, The BOCU and ROCU, Remote monitoring and RF distribution system of a mobile communication base station characterized in that separate transmission of the processing signal TX, RX0, RX1 signal and base station monitoring signal for remote monitoring and control.