KR20000059962A - Repeater having apparatus for slecting code in a mobile communication system - Google Patents

Abstract

PURPOSE: A relay having a code selection apparatus for a mobile communication system is provided for effectively allocating a base station channel in a region in which there are many communication traffics by implementing an access to a neighboring base station. CONSTITUTION: A code selection apparatus includes a forward processor(10), a rearward processor(20), a donor side duplexer(30), a donor antenna(35), a coverage side duplexer(40) and a coverage antenna(45). The forward processor(10) includes a first low noise amplifier(11), a first down converter(12), a first elastic surface wave filter(13), a selection output unit(14), a first up converter(17), a first high frequency bandwidth filter(18) and a first power amplifier(19). The selection output unit(14) includes a code generator(16) for generating a certain P.N code and a code signal selector(15) for selecting the same base station signal as the P.N code value inputted from the code generator(16) through the first surface elastic wave filter(13).

Description

REPEATER HAVING APPARATUS FOR SLECTING CODE IN A MOBILE COMMUNICATION SYSTEM}

The present invention relates to a repeater having a code selection device in a mobile communication system. More specifically, the repeater is inherent even when there are communication frequencies above a certain level transmitted by a plurality of base stations distinguished by pseudo noise (PN) codes. The present invention relates to a repeater equipped with a code selection device in a mobile communication system to communicate with a specific base station having a PN code value and cover a shadow area, thereby preventing signal interference according to a plurality of base stations and increasing communication efficiency of the base station.

In general, Code Division Multiple Access (CDMA) is a code division by dividing the same frequency by different pseudorandom binary sequences and the code division frequency according to the corresponding code at each receiver. It is a communication method according to multiple accesses that can maximize frequency efficiency by selectively receiving only predetermined signals. That is, such multiple access is based on the widely used spread spectrum communication method, and recently, it has been used for digital mobile communication and advanced wireless communication.

Here, the mobile communication system according to the code division multiple access method includes the first base station 100, the second base station 120, and the third divided into different pseudo noise codes (hereinafter referred to as " PN codes ") as shown in FIG. The base station 140 transmits a frequency with the respective coverage. Accordingly, the mobile station (not shown) existing in the coverage of the first base station 100, the second base station 120, and the third base station 140 selects only the desired signal using the PN code from the corresponding signal. Signals from other base stations with different codes are treated as noise rather than being restored to its original spectrum.

On the other hand, apart from the first base station 100, the second base station 120 and the third base station 140, the repeater 200 for the purpose of establishing a smooth communication communication environment in the mobile communication system and to expand its coverage. ) Is used. Since the repeater 200 has a low cost due to facility investment and operation, and the facility investment cost can be recovered early according to the ease of installation, the repeater 200 can provide services to the radio wave shadow area, radio wave weak area and unservice area of the ground. It is widely used for coverage extension.

That is, the repeater 200 receives the communication frequencies of the first base station 100, the second base station 120, and the third base station 140 having different PN codes by a predetermined level or more through the donor antenna 202. In this case, the communication frequency is amplified in a state where the interference is minimal by the PN code, and then transmitted to the shaded area through the coverage antenna 204. Therefore, the mobile station 250 in the shaded area communicates with any call frequency at the communication frequencies of the plurality of base stations.

Here, the general repeater is composed of a forward processing unit 200 and a reverse processing unit 205 as shown in FIG.

The forward processing unit 200 includes a first low noise amplifier 212, a first down converter 214, a first elastic surface wave filter 216, a first up converter 218, a first high frequency band filter 220, and A first power amplifier 222 is formed. The reverse processing unit 205 includes a second low noise amplifier 232, a second down converter 234, a second elastic surface wave filter 236, a second up converter 238, a second high frequency band filter 240, and a first frequency converter. It consists of two power amplifiers 242.

A donor side duplexer 210 is connected between the first low noise amplifier 212 and the second power amplifier 242 to apply a call signal received through the donor antenna 202 to the forward processor 200. The donor antenna 202 transmits a signal from the reverse processor 205 to the base station. A coverage side duplexer 230 is connected between the first power amplifier 222 and the second low noise amplifier 232, so that the signal amplified from the forward processing unit 200 is a coverage antenna. The mobile station 250 is connected to the mobile station 250 through 204, and the communication frequency of the mobile station 250 received through the coverage antenna 230 is applied to the reverse processor 205.

The first low noise amplifier 212 low noise amplifies the high frequency signal input from the donor side duplexer 210 and applies it to the first down converter 214 to be described later. The first down converter 214 converts the low noise amplified high frequency signal into an intermediate frequency that is easy to filter. The first surface acoustic wave filter 216 applies surface acoustic wave filtering on the intermediate frequency signal to the first upconverter 218 to be described later. The first upconverter 218 converts the surface acoustic wave filtered intermediate frequency signal from the first surface acoustic wave filter 216 into a high frequency signal.

The first RF band filter 220 performs band-pass filtering on the up-converted high frequency signal to the coverage side duplexer 230.

The second low noise amplifier 232 low noise amplifies the signal applied from the coverage-side duplexer 230 and applies it to the second down converter 234 which will be described later. The second down converter 234 converts the low noise amplified high frequency signal into an intermediate frequency signal that is easy to filter. The second surface acoustic wave filter 236 filters the surface acoustic wave of the intermediate frequency signal. The second up-converter 238 converts the surface acoustic wave filtered intermediate frequency signal from the second surface acoustic wave filter 236 into a high frequency signal. The second high frequency band filter 240 performs band-pass filtering on the up-converted high frequency signal to the donor side duplexer 210.

That is, the repeater having such a configuration is communicatively connected with a plurality of base stations, and the mobile station 250 existing in the shadow area, not the service area of the base station, is communicatively connected with the radio base station through the repeater 200.

At this time, the donor antenna 202 of the repeater receives all base station signals of a predetermined level or more and is forward processed by the forward echo processing unit 200 through the donor side duplexer 210, and the forward processing unit 200 performs amplification and filtering processing. The signal is then communicated via a coverage antenna 204 with the mobile station 250 present in the shaded area.

Here, the base stations 100, 120, and 140 each have a corresponding coverage, and the frequency signals of the base stations to be transmitted have different P.N codes. Therefore, all signals of the base station through the donor antenna 202 of the repeater 200 are amplified by the receiving and forward processing unit 203, and the amplified multiple base station signals are transmitted through the coverage antenna 204 to the mobile station in the shaded area. A communication connection with 250).

However, in such a repeater, the frequency signals of all base stations separated by different PN codes are received and amplified through the donor antenna of the repeater and transmitted to the mobile station in the shaded area, but the mobile station is actually connected to the communication frequency of one base station. A plurality of base station signals, i.e., frequency signals other than the base station signal that is communicatively connected to the mobile station, exist as interference. Therefore, even if a plurality of base stations do not use their talk frequency in the shaded area, a certain amount of talk frequencies are distributed through the repeater, thereby reducing coverage of the base station itself and reducing call quality.

That is, in the case of a conventional repeater, all base station signals of a predetermined level or more are received and relayed to a mobile station in a shaded area. Therefore, the mobile station is required to allocate a channel to the base station through the repeater, so that multiple base station resources are allocated to one mobile station, thereby reducing the coverage of the base station itself, and the repeater receives a signal from many base stations. There was a limit to increase the output due to the interference effect of different frequency signals.

Accordingly, the present invention has been made to solve the problems of the conventional repeater, and selects and amplifies only the call frequency signal of a specific base station among the call frequency signals transmitted from each base station and specifies only the call frequency signal of the base station that has received the reverse direction. It is an object of the present invention to provide a repeater having a code selection device in a mobile communication system which can increase the output of the repeater due to the reduction of interference and save the base station resources by providing a repeater transmitting to the base station.

In addition, the present invention can select the talk frequency signal of the desired base station by the repeater selector, if there is no room in a specific base station channel, it is possible to connect to another adjacent base station with a lot of space, such as downtown An object of the present invention is to provide a repeater having a code selection device in a mobile communication system for efficiently allocating a base station channel.

On the other hand, the present invention for achieving the above object is a forward processing unit for filtering and amplifying only the signal of the base station equal to the preset PN code value of the plurality of base station call signals received through the donor antenna and the donor side duplexer to transmit through the coverage antenna And a reverse processing unit which processes the call signal of the shadow area received through the coverage antenna and the duplexer of the coverage and transmits it through the donor antenna.

The forward processor includes a first low noise amplifier for low noise amplifying the talk frequency signal of the base station received from the donor side duplexer, and a first down signal for converting the low noise amplified high frequency signal from the first low noise amplifier to an intermediate frequency for easy filtering. A first surface acoustic wave filter for performing surface acoustic wave filtering on the converter, and a call frequency signal converted from the first downconverter to an intermediate frequency, and a PN code set among preset communication frequencies for surface acoustic wave filtering from the first surface acoustic wave filter. A selective output section for outputting only the talk frequency signal, a first upconverter for converting a talk frequency signal of a specific base station output from the selective output section into a high frequency signal, and a high frequency signal upconverted from the first upconverter A first RF band filter for filtering, and a band-filtered feature from the first RF band filter High-frequency amplifying the call frequency of the base station characterized by comprising a first high-frequency amplifier is applied to the duplexer side coverage.

And the selection output section comprises a code generation section for generating an arbitrary P.N code, and a signal selection section for selecting only base station signals equal to the code value input from the code generation section through the first elastic surface wave filter.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram for explaining a service according to relaying between a base station and a relay period in a conventional CDMA mobile telephone system.

2 is a detailed block diagram of a conventional repeater shown in FIG.

3 is a diagram illustrating a relay operation between a base station and a relay period according to the present invention;

4 is a detailed block diagram of a repeater according to the present invention;

<Description of the code | symbol about the principal part of drawing>

10 forward processing unit 11: first low noise amplifier

12. First down converter 13: First surface acoustic wave filter

14: selection output section 15: code signal selection section

16: code generator 17: the first up-converter

18: first high frequency band filter 19: first high frequency amplifier

20: reverse processing unit 21: second low noise amplifier

22. Second down converter 23: Second surface acoustic wave filter

24: second up-converter 25: second high frequency band filter

26: second high frequency amplifier

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

As shown in FIG. 3, a repeater having a base station and a code selection device according to the present invention has a PN code value of 12 for the first base station 100, a PN code value of 180 for the second base station 120, and When the PN code value of the base station 348 is 348, the call frequency signals of all base stations are received through the donor antenna 35 of the repeater 50, but only one base station call frequency is selected and selected by the internal selection operation. Amplified and in communication with the mobile station 250 in the shaded area through the coverage antenna 45.

That is, when the P.N code value is set to 12 in the repeater 50, only the communication frequency transmitted from the first base station 100 is finally connected to the mobile station 250 in communication.

Here, the configuration of the repeater having the code selection device is largely shown in Figure 4, the forward processing unit 10, the reverse processing unit 20, the donor side duplexer 30, the donor antenna 35, the coverage side duplexer 40 And a coverage antenna 45.

The forward processing unit 10 includes a first low noise amplifier 11, a first down converter 12, a first surface acoustic wave filter 13, a selective output unit 14, a first up converter 17, and a first high frequency band. It consists of a filter 18 and a first power amplifier 19. The selection output section 14 includes a code generator 16 for generating an arbitrary PN code, and a base station signal equal to the PN code value inputted from the code generator 16 includes a first surface acoustic wave filter 13. Code signal selection unit 15 to be selected through.

The reverse processing unit 20 includes a second low noise amplifier 21, a second down converter 22, a second surface acoustic wave filter 23, a second up converter 24, a second high frequency band filter 25, and a second A power amplifier 26.

The donor side duplexer 30 is connected between the first low noise amplifier 11 and the second power amplifier 26 to apply the talk frequency signal received from the donor antenna 35 to the forward processor 10. The donor antenna 35 transmits the talk frequency signal of the reverse processor 20 to the base station. The coverage-side duplexer 40 is connected between the first power amplifier 19 and the second low noise amplifier 21 to signal-process and transmit the talk frequency signal applied from the forward processor 20 to the mobile station 250. The communication frequency signal transmitted from the mobile station 250 is applied to the coverage antenna 45 and the reverse processor 20.

The first low noise amplifier 11 low noise amplifies a plurality of base station high frequency signals input from the donor side duplexer 30 and applies them to the first down converter 12 which will be described later. The first down converter 12 converts the low noise amplified RF signal into an intermediate frequency signal that is easy to filter. The first surface acoustic wave filter 13 performs surface acoustic wave filtering on an intermediate frequency signal identified by a code. The selection output unit 14 selects and outputs only base station signals that match the code values set in the plurality of base station signals filtered from the first surface acoustic wave filter 13. The first up-converter 17 converts one base station talk frequency signal into a high frequency signal to facilitate transmission. The first high frequency band filter 18 filters the up-converted high frequency signal and applies it to the first high frequency amplifier 19. The first high frequency amplifier 19 applies the high frequency filtered signal to the coverage side duplexer 40.

The second low noise amplifier 21 low noise amplifies the signal applied from the coverage side duplexer 40 and applies it to the second down converter 22 to be described later. The second down converter 22 converts the low noise amplified high frequency signal into an intermediate frequency signal to facilitate filtering. The second surface acoustic wave filter 23 performs surface acoustic wave filtering on an intermediate frequency signal output from the second down converter 22. The second up-converter 24 converts the surface acoustic wave filtered intermediate frequency signal from the second surface acoustic wave filter 23 into a high frequency signal. The second high frequency band filter 25 filters the up-converted high frequency signal and applies it to the second high frequency amplifier 26. The second high frequency amplifier 26 applies the filtered high frequency signal to the donor side duplexer 30.

On the other hand, look at the relay operation in detail with the shaded area by the repeater having such a configuration as follows.

First, the first base station 100, the second base station 120, and the third base station 140, which are divided into different pseudo noise codes (hereinafter, referred to as "P.N codes"), each transmit a frequency with corresponding coverage. The mobile station (not shown) in the coverage of each base station (100, 120, 140) selects only the desired signal by using a binary sequence from the corresponding signal, the signals of the other base station is processed as noise without the original recovery .

On the other hand, apart from the first base station 100, the second base station 120 and the third base station 140, the repeater 50 for the purpose of establishing a smooth communication communication environment in the mobile communication system and to expand its coverage Is being used.

That is, the repeater 50 receives the frequencies of the base stations 100, 120, and 140, which are received at a predetermined level or more, by the donor antenna 35, and the received frequency signals at this time are the respective coded frequencies, which are the donor side. Only the frequency having an arbitrary code value (preset code value) is amplified and filtered through the duplexer 30 and the forward processor 10. Therefore, this amplified and filtered arbitrary frequency is again amplified and then connected to the mobile station 250 in the shaded area through the coverage side duplexer 40 and the coverage antenna 45.

For example, when the code value of the first base station 100 is 12, the code value of the second base station 120 is 180, and the code value of the third base station 140 is 348, the three base stations 100, 120, 140 ) Are transmitted above a certain level, and the repeater 50 receiving the frequencies of these three base stations secures a specific area.

At this time, all the frequency signals of the base station (100, 120, 140) is input to the first low noise amplifier 11 through the donor antenna 35 and the donor side duplexer (30). Then, the broadcast frequency input to the low noise amplifier 11 (where the broadcast frequency means all base station signals received at a predetermined level or more) is low noise amplified, and the first down converter 12 and the first elastic surface wave filter ( Through 13), the frequency signal filtered from the high frequency to the intermediate frequency is applied to the selection output unit 14.

Then, the code signal selection section 15 of the selection output section 14 is a frequency signal generated from the code generation section 16, where the code value is 12, so that the code selection section 15 returns to the first base station. Only the frequency signal transmitted from 100) is selectively input. Therefore, the signal of the first base station 100 having a code value of 12 through this selection output unit 14 is converted into a high frequency signal at an intermediate frequency through the first up-converter 17, and the first RF band filter 18 Through band filtering. A frequency having a code value of 12, which is band filtered from the first RF band filter 18, is applied to the coverage duplexer 40 after high frequency amplification through the first high frequency amplifier 17. The coverage duplexer 40 then communicates with the mobile station 250 via the coverage antenna 45 at the frequency of the input code value 12.

In addition, the frequency transmitted from the mobile station 250 is again received through the coverage antenna 45, and the received frequency is received by the backward processing unit 20 through the coverage duplexer 40. In this case, the reverse processing unit 20 receives the received low frequency signal of the second low noise amplifier 21, the second down converter 22, the second elastic surface wave filter 23, the second up converter 24, and the second RF band. The high frequency amplification is finally achieved by passing through the filter 25 and the second high frequency amplifier 26. Therefore, the high frequency signal is transmitted from the donor antenna 35 through the donor side duplexer 30, thereby eventually making a call connection with the first base station 100.

In this case, the code value generated by the code generator 16 of the selection output unit 14 may be controlled by the user in a wired or wireless manner, that is, to arbitrarily select a signal of another base station. This is preferred. In addition, the selection output unit 14 is more preferably configured to automatically connect to a base station with less traffic among a plurality of base stations.

In addition, the selection output unit 14 may be configured to simultaneously perform the frequency selection operation of the desired base station together with the frequency conversion operation from the first down converter 12.

While the invention has been shown and described with respect to certain preferred embodiments, the invention is not limited to the embodiments described above, but in the field to which the invention pertains without departing from the spirit of the invention as claimed in the claims. Any person with ordinary knowledge will be able to make various modifications.

As described above, in the repeater, the present invention selects a specific PN code from a reception signal of a predetermined level or more received through a donor antenna to serve a shaded area through a coverage antenna, and amplifies and transmits various signals. It can increase the output of the repeater compared to the way. In addition, the signal of the other base station other than the code-selected base station signal is filtered by the repeater itself, so that the signal can be transmitted without interference to the mobile station, thereby improving the call quality. If there is no room in the base station channel, it is possible to connect to another adjacent base station with room to spare, thereby improving the flexibility of the call connection.

Claims (3)

Only the signals of the base station having the same PN code value among the call signals of the multiple base stations received through the donor antenna 35 and the donor side duplexer 30 are amplified and filtered to the coverage side duplexer 40 and the coverage antenna 45. A forward processing unit (10) for transmitting by means of; Reverse processing unit 20 for signal processing so that the call signal received from the coverage antenna 45 and the coverage-side duplexer 40 is sent to the donor-side duplexer 30 and the donor antenna 35 to communicate with a base station having the same code value. Repeater having a code selection device in a mobile communication system, characterized in that consisting of. The apparatus of claim 1, wherein the forward processor (10) comprises: a first low noise amplifier (11) for low noise amplifying a plurality of talk frequency signals received from a donor side duplexer (30); A first down converter 12 for converting a plurality of high frequency signals low noise amplified from the first low noise amplifier 11 into an intermediate frequency to facilitate filtering; A first surface acoustic wave filter 13 for surface acoustic wave filtering a plurality of communication frequency signals converted from the first down converter 12 into an intermediate frequency; A selection output unit 14 for outputting only a communication frequency signal corresponding to a predetermined P.N code among the surface acoustic wave filtered communication frequencies from the first surface acoustic wave filter 13; A first up-converter 17 for converting only the talk frequency signal of the specific base station output from the selective output section 14 into a high frequency signal; A first high frequency band filter 18 for band filtering the high frequency signal up-converted from the first up-converter 17; Code selection in a mobile communication system comprising a first high frequency amplifier (17) for high frequency amplifying the communication frequency of a specific base station band-filtered from the first high frequency band filter (18) and applying it to the coverage-side duplexer (40). Repeater with device. 3. The apparatus of claim 2, wherein the selective output unit (14) comprises: a code generator (16) for generating P.N codes corresponding to a plurality of base stations; Only to the code signal selector 15 which selects from the first elastic surface wave filter 13 the base station talk frequency signal equal to an arbitrary code value output from the code generator 16 and applies it to the first up-converter 17. Repeater having a code selection device in a mobile communication system, characterized in that made.