KR20010011619A - Base transceiver subsystem in mobile communication system and method for transmitting signal between base transceiver subsystem - Google Patents

Abstract

PURPOSE: A base transceiver subsystem(BTS) of a mobile communication system and method for transmitting signals between the BTSs is provided to transmit a data signal, between a radio frequency(RF) unit and a channel unit, and a wireless frequency signal on a single line, when the RF frequency unit and the channel unit of the BTS are separated by predetermined spaces. CONSTITUTION: A remote base transceiver subsystem(BTS)(100) having a radio frequency(RF) unit(110) processes the transceiving of an RF. A main BTS(200) includes a channel unit(210) having more than one BTS channel card. The first interface unit(120) configured in the remote BTS(100) transmits an RF signal from the channel unit(210) and a data signal from the remote BTS(100) to the main BTS(200). The second interface unit(230) configured in the main BTS(200) transmits an RF signal from the channel unit(210) and a data signal from the main BTS(200) to the remote BTS(100). And a communication line transmits data signals between the first interface unit(120) and the second interface unit(230).

Description

Base transceiver subsystem in mobile communication system and method for transmitting signal between base transceiver subsystem

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station apparatus of a mobile communication system, and more particularly, to a signal transmission method between a base station apparatus and a base station apparatus of a mobile communication system suitable for constructing a base station apparatus by separating a radio frequency unit and a channel portion of a base station apparatus. .

A code division multiple access (CDMA) system is composed of a base station, a base transceiver station (BTS), a control station (BSC), and a mobile switching center (MSC). It is a system that is connected to base station and wireless section to control mobile station and connect call channel of mobile station.

Hereinafter, a conventional base station apparatus will be described with reference to the accompanying drawings.

1 is a block diagram illustrating a conventional base station apparatus.

As shown in FIG. 1, the conventional base station apparatus includes an antenna 50 for transmitting and receiving radio frequencies between the base station 10 and a mobile station (not shown), and is connected to the antenna 50 and received through the antenna 50. At least one channel card comprising a radio frequency unit 20 for down-converting the radio frequency or up-converting the radio frequency transmitted to the antenna 50, and a microprocessor, a peripheral device, a modulator, and the like to provide a traffic channel. And a control unit 30 for controlling the radio frequency unit 20 and the channel unit 40.

In the conventional base station apparatus, the radio frequency unit 20, the control unit 30, and the channel unit 40 exist in the same rack. In this case, the presence in the rack means that the radio frequency unit 20, the control unit 30, and the channel unit 40 are formed in one set without being installed separately.

Here, the data transmission between the radio frequency unit 20, the control unit 30 and the channel unit 40 is transmitted and received through a data transmission cable suitable for transmitting short-range data, and the radio frequency (RF) transmission is much Because information is transmitted to a long distance, a high frequency is used, so a separate radio frequency (communication frequency assigned to a carrier) transmission cable suitable for high frequency transmission is used.

In the conventional base station apparatus, since the radio frequency unit, the channel unit, and the control unit are configured in the same rack, the distance between the radio frequency unit and the channel unit is not far, but recently, the size of the base station apparatus including the radio frequency unit, the control unit, and the channel unit Due to the problem, the radio frequency unit and the channel unit are separated and installed in the outdoor such as on the roof of a building, and if the existing data transmission cable between the radio unit and the channel unit is used, it is not possible to transmit a large amount of information as well. There was a problem that an error might occur.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned problems of the prior art, and in the case where the radio frequency unit and the channel unit of the base station apparatus are separated from each other by a predetermined distance, the data signal and the radio between the radio frequency unit and the channel unit It is an object of the present invention to provide a signal transmission method between a base station apparatus and a base station apparatus of a mobile communication system capable of transmitting a frequency signal in a single line.

According to an aspect of the present invention for achieving the above object, in a base station apparatus including a remote base station configured with a radio frequency unit for processing radio frequency transmission and reception, and a main base station configured with a channel unit consisting of at least one base station channel card And a first interface unit configured in the remote base station to transmit a radio frequency signal received from the radio frequency unit and a data signal of the remote base station to the main base station. A second interface unit configured in the main base station to transmit radio frequency signals from the channel unit and data signals of the main base station to the remote base station; and a communication line for transmitting data signals between the first and second interface units. It is composed.

In addition, according to another feature of the present invention for achieving the above object, a channel unit consisting of a remote base station and a radio base unit for processing radio frequency transmission and reception, at least one base station channel card and the remote base station and the channel unit A base station apparatus comprising a main base station configured with a controlling unit, the method comprising: modulating a data signal of the remote base station, multiplexing the data signal of the modulated remote base station and the radio frequency received from the radio frequency unit; Transmitting the multiplexed data signal of the remote base station and the radio frequency to the main base station; demultiplexing the data signal and radio frequency of the remote base station transmitted from the remote base station from the main base station; Is transmitted to the channel section And, a data signal of the modulated remote base station comprises a step of transmission by demodulating with the main base station control unit.

According to the present invention as described above, since the main base station and the remote base station can be configured separately when the base station apparatus is configured, the base station apparatus can be freely installed, and thus the base station apparatus can be easily installed.

1 is a block diagram showing a conventional base station apparatus

2 is a block diagram illustrating a base station apparatus according to the present invention.

3 is a block diagram showing in detail the base station apparatus shown in FIG.

4 is a block diagram illustrating in detail the interface shown in FIG.

5A to 5B are diagrams illustrating a demodulation unit and an interface unit of the base station apparatus shown in FIG.

* Description of the symbols for the main parts of the drawings *

100: remote base station 110: radio frequency unit

120: first interface unit 121: multiplexing unit

122: demultiplexer 130: remote base station modulator

140: remote base station demodulation unit 150: base station state monitoring control unit

160: duplexer 200: main base station

210: channel unit 220: control unit

230: second interface unit 240: main base station demodulation unit

250: main base station modulator

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram illustrating a base station apparatus according to the present invention, and FIG. 3 is a block diagram illustrating the base station apparatus illustrated in FIG. 2 in detail.

As shown in FIGS. 2 and 3, the base station apparatus according to the present invention includes a radio frequency (RF) unit 110 that is connected to the antenna 300 and up or downconverts a radio frequency transmitted and received through the antenna 300. A control unit comprising a remote base station 100, a channel unit 210 composed of a microprocessor, a peripheral device, a demodulator and the like, and at least one channel card providing a traffic channel, and the channel unit 210. It consists of a main base station 200 consisting of (220).

Here, the remote base station 100 and the main base station 200 has a first interface unit 120 and a second interface unit for transmitting and receiving radio frequency signals and data signals between the remote base station 100 and the main base station 200 ( 230).

The first interface unit 120 includes a remote base station multiplexer 121 for multiplexing a signal transmitted from the remote base station 100 to the main base station 200, and the main base station 200 to the remote base station 100. Remote base station demultiplexer 122 for demultiplexing the transmitted signal, the second interface unit 230 is the main base station multiplexer for multiplexing the signal transmitted from the main base station 200 to the remote base station 100 231 and a main base station demultiplexer 232 for demultiplexing a signal transmitted from the remote base station 100 to the main base station 200.

As shown in FIG. 3, the remote base station 100 and the main base station 200 of the base station apparatus according to the present invention wirelessly communicate between the remote base station 100 and the mobile station (not shown) through the radio frequency unit 110. An antenna 300 for transmitting and receiving frequencies, a duplexer 160 for controlling transmission and reception operations of the antenna 300, a remote base station modulator 130 for modulating a data signal of the remote base station 100, and the antenna ( Remote base station multiplexer 121 for multiplexing the radio frequency signal received at 300 and the data signal of the remote base station modulated by the remote base station modulator 130 and transmitting to the demultiplexer 231 of the main base station 200. And demultiplexing the radio frequency signal and the data signal multiplexed and transmitted by the remote base station multiplexer 121 to transmit the radio frequency signal to the channel unit 210 of the main base station, and the data signal is the data signal. A main base station demultiplexer 231 for transmitting to a demodulated main base station demodulator 240 and a main base station modulator 250 for modulating a data signal from a control unit (220 in FIG. 2) of the main base station 200. And a main base station multiplexer 232 for multiplexing the radio frequency signal from the channel unit 210 and the data signal of the modulated main base station and transmitting the multiplexed signal to the demultiplexer 122 of the remote base station. The multiplexer 232 demultiplexes the radio frequency signal and the modulated main base station data signal, which are multiplexed and transmitted, and transmits the radio frequency signal to the antenna 300 through the duplexer 160 and transmits the modulated main base station data of the modulated main base station. Data is composed of a remote base station demultiplexer 122 for transmitting to the remote base station demodulator 140 for demodulating the modulated data.

Here, the signal demodulated by the main base station demodulator 240 is transmitted to the controller (220 of FIG. 2) of the main base station, and the data signal demodulated by the remote base station demodulator 140 is the base station state of the remote base station 100. The monitoring control unit 150 is stored.

The base station apparatus of the present invention transmits a signal obtained by combining a radio frequency signal and a modulated data signal (modem signal) of a modulated main base station controller in a transmission path sent from the main base station 200 to the remote base station 100. Demultiplexing the two signals in the multiplexer 122 and transmits them to the antenna 300 and the remote base station demodulator 140, and the demodulated data signal from the remote base station demodulator 140 is the base station state monitoring control unit ( It is stored in 150 to control and monitor the inside of the remote base station. The base station state data signal is output to the remote base station modulator 130.

In the reception path sent from the remote base station 100 to the main base station 200, a data signal (modem signal) of the remote base station modulated by the remote base station modulation unit 130 and a radio frequency (RF) received from the antenna 300 are received. When the signal is combined by the remote base station multiplexer 121 and transmitted to the demultiplexer 231 of the main base station 200, the main base station demultiplexer 231 separates the two signals and the radio frequency signal is the channel unit 210. ), The data signal of the base station is demodulated by the main base station demodulator 240 and transmitted to the control unit 220 of the main base station 200. In this case, an RF transmission cable or an optical cable is used as the reception and transmission path.

FIG. 4 is a block diagram illustrating in detail the multiplexer MUX and the demultiplexer DEMUX illustrated in FIG. 3, and the first interface 120 of the remote base station 100 will be described as an example.

The remote base station multiplexer 121 of the first interface unit 120 according to the present invention is a condenser 121b which prevents the modem signal modulating the data signal of the base station to be returned to the radio frequency (RF) input terminal (a) And transmitting only the data signal of the base station when modulating and transmitting the data signal (modem signal) of the base station modulated by the remote base station modulator 130 and preventing the radio frequency signal from flowing back to the remote base station modulator 130. Filter 121a is configured.

Here, the demultiplexer 122 receives the radio frequency signal and the modem signal, removes the high frequency radio frequency signal and passes only the low frequency modem signal, and the condenser 122b for separating only the radio frequency signal. And an attenuator 122c that attenuates the radio frequency signal, which is a high frequency, received from the antenna 300 to a predetermined level.

5A to 5B are diagrams illustrating a demodulation unit and an interface unit of the base station apparatus shown in FIG.

The modulation and demodulation unit and the interface unit according to the present invention are modulated by a radio frequency (RF) signal (CDMA coding signal) and the remote base station modulator 130 by the multiplexer 121 of the remote base station 100 (eg, For example, when data signals of a base station subjected to frequency shift keying (FSK) are input, the two signals are heterogeneous signals, so that the condenser 121b of the radio frequency path does not affect each other's input paths having different characteristics. Data signal of the base station is prevented from flowing back to the radio frequency input side, and only the data signal is transmitted to the data paths (b, c, d) when the base station state check data signal is modulated and transmitted. Pass through filter 121a (preferably a low pass filter (LPF) in the 200 MHz band) to prevent backflow to the side of the circuit to prevent distortion of the data signal. The radio frequency (RF) signal generated in this manner and the data signal of the modulated base station are transmitted using the same line, so that the low frequency base station data signal (data modem signal) and the high frequency radio frequency signal coexist at the same time. Multiplexing is realized by muxing and outputting the radio frequency signal and the data signal (modem signal) of the base station.

In addition, in the remote base station demultiplexer 122, when the radio frequency signal and the data signal (modem signal) of the base station, which are heterogeneous signals transmitted by being combined on the same line, are input to the input terminal (a) of the demultiplexer, the data signal of the base station (modem) Signal) passes through filter 122a (preferably a low pass filter in the 200 MHz band), and the high frequency radio frequency (RF) signal is removed and only the data signal (modem signal) of the base station, which is a low frequency signal, is separated and the remote base station demodulator After passing through 142, the data signal of the base station is demodulated.

In addition, the radio frequency signal and the heterogeneous signal, which is a data signal (modem signal) of the base station, are separated through the condenser 122b, and only the radio frequency signal is separated, and the radio frequency signal is output at a predetermined level by the attenuator 122c. As a result, demultiplexing is performed to separate the radio frequency signal and the data signal of the base station into a low frequency data modem signal and a high frequency radio frequency signal.

The present invention as described above has the following effects.

First, since the channel part and the radio frequency part can be separated from the base station of the communication system, the channel part and the control part of the base station device can be installed inside the building, and the radio frequency part can be installed on the roof of the outside of the building to increase the space utilization. It is easy to install.

Second, since the radio frequency signal line and the data signal line of the base station can be unified, it is easy to configure the base station apparatus with a single main base station and a plurality of remote base stations.

Third, it is easy to construct a repeater in the form of a small base station, which is widely practiced in recent years.

Claims (5)

A base station apparatus comprising a remote base station configured with a radio frequency unit for processing radio frequency transmission and reception, and a main base station configured with a channel unit consisting of at least one base station channel card, A first interface unit configured at the remote base station to transmit a radio frequency signal received at the radio frequency unit and a data signal of the remote base station to the main base station; A second interface unit configured in the main base station to transmit radio frequency signals from the channel unit and data signals of the main base station to the remote base station; And a communication line for transmitting data signals between the first and second interface units. The radio communication apparatus of claim 1, wherein the first interface unit multiplexes a radio frequency signal from the radio frequency unit and a data signal of the remote base station, and the radio frequency signal and data transmitted from the second interface unit. Remote base station demultiplexer for demultiplexing the signal, The second interface unit includes: a main base station multiplexer for multiplexing the radio frequency signal from the channel unit and the data signal of the main base station; and a main for demultiplexing the radio frequency signal and data signal multiplexed and transmitted by the first interface unit. A base station apparatus of a mobile communication system, characterized by comprising a base station demultiplexer. 3. The remote base station of claim 2, wherein the remote base station demodulates a data signal transmitted from a remote base station modulator for modulating and transmitting the data signal of the base station to the remote base station multiplexer and a main base station demultiplexed by the remote base station demultiplexer. Remote base station demodulation unit is further configured, The main base station includes a main base station modulator for modulating a data signal transmitted from the main base station and transmitting the modulated data signal to the main base station multiplexer, and a main base station for demodulating data signals transmitted from a remote base station demultiplexed by the main base station demultiplexer. A base station apparatus of a mobile communication system, characterized in that the demodulator further configured. 2. The apparatus of claim 1, wherein the remote base station multiplexer or the main base station multiplexer comprises: a condenser for preventing the data signal of the modulated base station from flowing back to the radio frequency input side; And a filter configured to prevent backflow to the main base station modulator. A base station apparatus comprising a remote base station having a radio frequency unit for processing radio frequency transmission and reception, a channel unit consisting of at least one base station channel card, and a main base station having a control unit controlling the remote base station and the channel unit, Modulating a data signal of the remote base station; Multiplexing the modulated data signal of the remote base station and the radio frequency received by the radio frequency unit; Transmitting the multiplexed data signal of the remote base station and the radio frequency to the main base station; The data signal of the remote base station and the radio frequency transmitted from the remote base station are demultiplexed from the main base station to transmit the radio frequency to the channel unit, and the modulated data signal of the remote base station is demodulated to the main base station control unit. And transmitting the signal between the base station apparatuses of the mobile communication system.