KR20000001942A - Periodical beacon signal generator for multi-sectored base transceive station - Google Patents

Abstract

PURPOSE: A periodical beacon signal generator is provided to minimize the right directional noise in handoff. CONSTITUTION: A periodic beacon signal generator for a multi-sectored base transceive base station comprises: a first switching part(210) to selectively switch many pseudo noise signals delivered from the multi-sector; an upward conversion part(220); a second switching part(230) to switch the beacon signal output from the upward conversion part to the needed sector; a frequency level control part(240) to control the level of the signal converted upward; and a switching control part(250) to control the switching time of a first and a second switching part(210,230) and the switching of the first and the second switching part.

Description

Periodic Beacon Signal Generator for Multi-Sectorized Base Stations

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for generating a periodic beacon signal for a multisectorized base station of a wireless communication system using a code division multiple access method, and more particularly, to a multisectorized using a code division multiple access method. The present invention relates to a periodic beacon signal generator for transmitting a beacon signal used for handoff between base stations.

1 is a block diagram of a conventional multi-sectorized base station type beacon signal generator, a plurality of up-converters (110, 120, 130,) and a plurality of linear amplifiers (140, 150, 160).

As shown in the figure, when the pseudo noise signals α, β, and γ of the intermediate frequency band are transmitted from sectors of one base station, the plurality of up-converters 110, 120, and 130 respectively transmit pseudo noise signals. Uplinking the (α, β, γ), the upconverted beacon signal is transmitted to a plurality of linear amplifiers (140, 150, 160). Subsequently, the plurality of linear amplifiers 140, 150, and 160 respectively amplify the transmitted beacon signals linearly and output them to sectors of other base stations.

FIG. 1B is an operation timing diagram of a conventional beacon signal generator for a multi-sectorized base station, and it can be seen that pseudo noise signals α, β, and γ transmitted from sectors of the base station are transmitted at the same time. have.

However, in the case of the conventional multi-sectorized base station type beacon signal generating device as described above, the beacon signal generator has a structure for continuously generating a plurality of beacon signals, thereby increasing the frequency conversion circuit as much as the beacon operation number (ie, upward). It requires a converter ((UP-Converter)), it needs an output device (that is, a linear amplifier) of the capacity that can accommodate the beacon operation water by increasing the load of the output stage, and FA (Frequency) when operating a plurality of beacons In addition to significantly reducing coverage for each assignment, the mobile terminal has a problem of adversely affecting the handoff signal processing by increasing the non-calling forward noise during handoff processing after recognizing the beacon signal in the terminal.

Accordingly, the present invention has been made to solve the above problems, and operates a beacon signal for handoff between multi-sectorized base stations having different traffic FAs in a wireless communication system such as a code division multiple access method. It is an object of the present invention to provide a periodic beacon signal generator capable of minimizing forward noise during handoff by transmitting a beacon signal by frequency hopping in a time division multiplexed state for each sector.

1A is a block diagram of a conventional beacon signal generator for a multisectorized base station.

1B is an operation timing diagram of a conventional beacon signal generator for a multisectorized base station.

2 is a block diagram of an apparatus for generating a periodic beacon signal for a multi-sectorized base station according to an embodiment of the present invention.

3 is an operation timing diagram of a periodic beacon signal generator for a multi-sectorized base station according to the present invention.

Explanation of symbols on the main parts of the drawings

210: first switching unit 220: up-conversion unit

230: second switching unit 240: frequency level control unit

250: switching control unit

The present invention for achieving the above object, in the periodic beacon signal generator for operating a plurality of beacon signals for handoff between multi-sectorized base stations with different traffic FA (Frequency Assignment), the control of the switching control means First switching means for selectively switching a plurality of pseudonoise signals transmitted from the multi-sector; Up-converting means for up-converting the signal transmitted from the first switching means into a high frequency signal under the control of the frequency level control means; Second switching means for switching a beacon signal output from the up-converting means to a desired sector under the control of the switching control means; The frequency level control means for providing a switching time control signal for controlling the switching time of the first and second switching means, and for controlling the level of the signal upconverted by the upconverting means; And the switching control means for receiving the switching time control signal to control the switching time of the first and second switching means and to control the switching operation of the first and second switching means.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of an apparatus for generating a periodic beacon signal for a multi-sectorized base station according to an embodiment of the present invention.

Referring to FIG. 2, a periodic beacon signal generator for a multi-sectorized base station of the present invention includes a first switching unit 210 for selectively switching a plurality of pseudo noise signals transmitted from a multi-sector, and a first switch. An upconversion unit 220 for upconverting the intermediate frequency signal transmitted from the switching unit 210 to a high frequency signal, and a second switching unit for switching the beacon signal output from the upconversion unit 220 to a desired sector ( 230, the frequency level controller 240 for controlling the level of the signal up-converted by the up-converter 220, and the switching time of the first and second switching units 210 and 230, And a switching controller 250 for controlling switching operations of the first and second switching units 210 and 230.

The first and second switching units 210 and 230 use a switch using a PIN diode method.

The up-converter 220 generates a first frequency generator 221 for generating a frequency of about 65.4 MHz and an intermediate frequency signal transmitted from the first switch 210 from the first frequency generator 221. The first up-converter 222 for up-converting the first frequency converter, the first filter 223 for filtering the output signal of the first up-converter 222, and the output signal of the first filter 223. A first amplifier 224 for amplifying a signal, a second filter 225 for filtering an output signal of the first amplifier 224, and a signal attenuator 226 for attenuating an output signal of the second filter 225. ), A second amplifier 227 for amplifying the output signal of the signal attenuator 227, a third filter 228 for filtering the output signal of the second amplifier 227, and a third filter 228. The third amplifier 229 for amplifying the output signal of the control and the frequency level control unit 240 to generate a frequency of 799 to 829MHz A second up-converter 262 for mixing the second frequency generator 261 and the output signal of the third amplifier 229 with the frequency generated from the second frequency generator 261 to up-convert And a fourth amplifier 263 for amplifying the output signal of the second up-converter 262 and a fourth filter 264 for filtering the output signal of the fourth amplifier 263.

First, the operation of the up-converter having the structure as described above will be described in detail as follows.

When the intermediate noise pseudo noise signal and the about 65.4 MHz frequency generated from the first frequency generator 221 are transferred to the first up-converter 222 through the first switching unit 210, the first up-converter 222 is transmitted. ) Mixes the intermediate noise pseudo-noise signal transmitted from the first switching unit 210 with the frequency of about 65.4 MHz generated from the first frequency generator 221 to convert the signal up-converted to the frequency of about 70 MHz. Output to the filter 223.

The first filter 223 filters the signal of about 70 MHz transmitted from the first up-shifter 222, removes an unnecessary frequency band signal, extracts only a signal of a desired frequency band, and outputs the signal to the first amplifier 224. do.

The first amplifier 224 amplifies the output signal of the first filter 223 and outputs it to the second filter 225 to compensate for the signal lost in the filtering process of the first filter 223.

The second filter 225 filters the output signal of the first amplifier 224 and outputs it to the signal attenuator 226 in order to remove noise generated during the amplification of the first amplifier 224.

The signal attenuator 226 attenuates the output signal of the second filter 225 to an appropriate signal level and outputs it to the second amplifier 227 so that the beacon signal of the desired level delivered to the second switching means 230 is transmitted. .

The second amplifier 227 amplifies the output signal of the signal attenuator 226 to compensate for the signal lost in the filtering process of the second filter 225 and the signal attenuation process of the signal attenuator 226. Output to (228).

The third filter 228 filters the output signal of the second amplifier 227 to remove the noise generated in the signal attenuation process of the signal attenuator 226 and the amplification process of the second amplifier 227, thereby filtering the third amplifier. Output to (229).

The third amplifier 229 amplifies the output signal of the third filter and outputs it to the second up-converter 262 to compensate for the signal lost in the filtering process of the third filter 228. In this case, when the second frequency generator 261 is controlled by the frequency level controller 240 to provide a frequency of 799 to 824 MHz to the second up-converter 262, the second up-converter 262 may include a third amplifier ( The output signal of 229 is mixed with the frequency generated from the second frequency generator 261, and the high frequency signal up-converted to about 800 MHz is output to the fourth amplifier 263.

The fourth amplifier 263 amplifies the output signal of the second up-converter 262 and outputs it to the fourth filter 264 to compensate for the signal lost in the signal conversion process of the second up-converter 262. .

The fourth filter 264 filters the output signal of the fourth amplifier 263, removes unnecessary frequency bands, extracts only signals of a desired frequency band, and outputs the signals to the second switching unit 230. At this time, the signal transmitted to the second switching unit 230 is a beacon signal.

Next, the operation of the multi-sectorized base station type beacon signal generator of the present invention having such a structure will be described in detail as follows.

From the sectors of the multisectorized first base station (not shown), the pseudo noise signals α, β, and γ of the intermediate frequency band are respectively transferred to the switches 211, 212, and 213 of the first switching unit 210. When transmitted, the first switching unit 210 is controlled by the switching control unit 250 to selectively transmit the pseudo noise signals (α, β, γ) transmitted from the sectors of the first base station to the up-conversion unit 220. To pass. In this case, the switches 211, 212, and 213 of the first switching unit 210 are not turned on at the same time, but are turned on / off by a control period of time by the switching controller 250.

Subsequently, the up-converter 220 receives the pseudo-noise signal of the intermediate frequency from the first switch 210, and converts the high-frequency beacon signal up-converted through the process described above to the second switch 230. When outputting to the second switch 230, the switches 231, 232, 233 of the second switching unit 230 is controlled by the switching control unit 250 to multi-sector beacon signal output from the up-conversion unit 220 (Not shown).

In addition, the switching time of the first and second switching units 210 and 230 is controlled by the switching controller 250, that is, through a time adjustment button (not shown) connected to the frequency level controller 240 by the user. When the switching time is input, the frequency level control unit 240 transmits the switching time input through the time adjustment button to the switching control unit 250, and then the switching control unit 250 receives the switching time from the frequency level control unit 240. The switching time control signal is provided to the first and second switching units 210 and 230 to adjust the switching time of the first and second switching units 210 and 230.

For example, when sequentially transmitting pseudo noise signals α, β, and γ transmitted from the sectors of the first base station, operations of the first and second switching units 210 and 230 will be described in detail. Is as follows.

The switching controller 250 simultaneously turns on the switch 211 of the first switching unit 210 and the switch 231 of the second switching unit 230 to transmit a pseudo noise signal transmitted from one sector of the first base station. α is transmitted to the up-converter 220 through the switch 211, and a beacon signal output from the up-converter 220 is transmitted to one sector of the second base station through the switch 231. Subsequently, after a certain time, the switching controller 250 simultaneously turns off the switches 211 and 231 and then simultaneously turns on the switches 212 and 232 to transmit the pseudo noise signal β transmitted from another sector of the first base station. ) Is transmitted to the up-converter 220 through the switch 212, and the beacon signal output from the up-converter 220 is transmitted to another sector of the second base station through the switch 232. Subsequently, after a certain time, the switching controller 250 simultaneously turns off the switches 212 and 232 and then turns on the switches 213 and 233 simultaneously, thereby providing a pseudo noise signal transmitted from another sector of the first base station. γ is transmitted to the up-converter 220 through the switch 213, and the beacon signal output from the up-converter 220 is transmitted to another sector of the second base station through the switch 233. .

3 is an operation timing diagram of a periodic beacon signal generator for a multi-sectorized base station according to the present invention.

As shown in FIG. 3, in operating a plurality of beacon signals for handoff between multi-sectorized base stations with different traffic FAs, a plurality of pseudo-noise signals α, β, and γ are time-division multiplexed. It is to minimize the forward noise in the handoff process by allowing periodic transmission in the closed state.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention uses a single up-converter in multi-sector operation in operating a beacon signal for handoff in a sectorized base station with different traffic FAs in a wireless communication system such as a code division multiple access method. As a result, the cost can be remarkably reduced compared to the conventional one using a plurality of upconverters, and the frequency of the frequency division multiplexing by each sector allows the beacon signal to be transmitted by minimizing the forward noise during handoff. Can significantly improve.

Claims (4)

In the periodic beacon signal generator for operating a plurality of beacon signals for handoff between multi-sectorized base stations having different traffic FA (Frequency Assignment), First switching means for selectively switching a plurality of pseudo noise signals transmitted from the multi-sector under the control of a switching control means; Up-converting means for up-converting the signal transmitted from the first switching means into a high frequency signal under the control of the frequency level control means; Second switching means for switching a beacon signal output from the up-converting means to a desired sector under the control of the switching control means; The frequency level control means for providing a switching time control signal for controlling the switching time of the first and second switching means, and for controlling the level of the signal upconverted by the upconverting means; And The switching control means for controlling the switching time of the first and second switching means by receiving the switching time control signal and controlling the switching operation of the first and second switching means; Periodic beacon signal generator for multi-sectorized base station comprising a. The method of claim 1, The upconversion means, First frequency generating means for generating a first frequency; A first up-converter for up-converting the intermediate frequency signal transmitted from the first switching means by mixing with the first frequency; First filtering means for extracting a signal having a desired frequency band by filtering an output signal of the first up-conversion unit; First amplifying means for amplifying the output signal of the first filtering means; Second filtering means for filtering out an output signal of the first amplifying means to remove noise; Signal attenuation means for attenuating the output signal of the second filtering means; Second amplifying means for amplifying the output signal of the signal attenuating means; Third filtering means for filtering out an output signal of the second amplifying means to remove noise; Third amplifying means for amplifying the output signal of the third filtering means; Second frequency generating means for generating a second frequency in accordance with the frequency level control signal provided from said frequency level control means; Second up-converting means for up-converting the output signal of the third amplifying means by mixing with the second frequency; Fourth amplifying means for amplifying the output signal of the second up-converting means; And Fourth filtering means for filtering the output signal of the fourth amplifying means to extract a beacon signal of a desired frequency band and outputting the beacon signal to the second switching means; Periodic beacon signal generator for multi-sectorized base station comprising a. The method according to claim 1 or 2, The first and second switching means, respectively, And as many sectors as there are switches in the base station. 4. The periodic beacon of claim 3, wherein the first up-converter outputs a frequency of about 70 MHz, and the second up-converter outputs a frequency of about 800 MHz. Signal generator.