KR100573932B1 - Repeater system with oscillation prevention function and automatic reverse output function when no subscriber is present and control method - Google Patents

Abstract

The present invention relates to a repeater system having an oscillation prevention function and a reverse output automatic shutoff function when there is no subscriber, and a control method thereof, comprising: a first duplexer connected to an external base station; A transmitter for amplifying a signal received by the first duplexer and outputting the signal at a service frequency; A second duplexer for wirelessly transmitting an output signal of the transmitter to a mobile station in a corresponding service area and receiving a signal transmitted from the mobile station; A receiver for amplifying and outputting a signal received by the second duplexer; Is coupled to an output signal of the receiver to sense a power level of the receiver, and if the power level is equal to or greater than a first reference value for a first time or equal to or less than a second reference value for a second time, outputting the output of the receiver to a first duplexer It includes a control unit that does not transmit to, and when the time zone and the reverse oscillation is detected in the repeater service area and the reverse oscillation is detected, the reverse output is blocked to prevent the base station capacity decrease and to protect the reception path.

Repeater, high frequency, intermediate frequency, mobile phone, terminal

Description

Repeater System having anti-oscillation function and auto shutdown function when no user exist and control method therefor}

1 is a block diagram of a repeater system according to an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of the control unit of FIG. 1.

3 is a timing diagram showing the flow of the high limit check logic of the controller.

4 is an operational flow diagram for programming the high limit logic.

5 is a timing diagram illustrating a flow of a low limit check logic of the controller.

6 is an operational flow for programming low limit logic.

The present invention relates to a repeater system having an oscillation prevention function and a control method thereof, and more particularly, to a repeater system and a control method thereof used in conjunction with a base station of a mobile communication system.

In general, a mobile communication service system includes a base station transceiver system, a base station controller, a mobile switching center, and a mobile station.

The base station and the mobile station communicate in a constant frequency band, and each base station has a constant call radius. Therefore, by arranging a plurality of base stations appropriately so that the call radius of each base station overlaps each other, the area where the call is possible can be expanded.

However, even when the entire city is covered by the arrangement of the plurality of base stations, a call shadow area is generated in which the call is not possible in the underground space of a large building and the inside of a high-rise building.

Due to the occurrence of the call shadow area, the mobile phone user may not receive smooth call service within the call shadow area. In order to solve the problem of the occurrence of the call shadow area, a repeater is conventionally installed in the shadow area, and the repeater can solve the shadow area at a lower cost than the base station.

In general, several or dozens of such repeaters are connected to one base station, and as the number of repeaters connected increases, the amount of noise introduced in the reverse direction of the base station also increases in proportion, resulting in a decrease in capacity of the base station.

In addition, the repeater itself oscillation may occur according to the installation site or situation. In the forward oscillation, service failure occurs only in the corresponding service area, but the reverse oscillation causes a fatal defect in the receiving path of the base station to which the repeater is connected. There is this.

Technical problem of the present invention is to solve such a conventional problem, the oscillation that prevents the base station capacity is reduced by protecting the reception path by blocking the reverse output when there is no subscriber in the repeater service area and when the reverse oscillation is detected It is to provide a repeater system having a protection function and automatic reverse output function when there is no subscriber and a control method thereof.

Repeater system according to one feature of the invention,

A transmitter for amplifying data received from an external base station, converting the signal to a sub-servo frequency, and wirelessly transmitting the data to a mobile station in a corresponding service area;

A receiver which amplifies the signal transmitted from the mobile station and outputs the signal to the base station;

And a control unit which senses a power level of the receiver and does not transmit an output of the receiver to the base station if the power level is equal to or greater than a first reference value for a first time or equal to or less than a second reference value for a second time.

Repeater system control method according to another feature of the present invention,

Dividing a repeater oscillation signal, a call signal, an access signal, and the like and blocking the reverse output of the repeater when the repeater oscillates, and detecting the power state after a first time;

Blocking the reverse output of the repeater if the power is oscillated;

If the power is not an oscillation and is an access and call signal, maintaining the reverse output of the repeater again.

Then, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily practice the present invention. In particular, hereinafter, a personal communication service (PCS) system will be described as an example for convenience of description.

1 is a block diagram of a repeater system according to an embodiment of the present invention.

As in Figure 1, the repeater system according to an embodiment of the present invention,

A duplexer 400 which transmits data transmitted and received from an external base station to a corresponding path;

A transmitter 100 for amplifying a signal received from the duplexer 400 and outputting the signal at a service frequency;

A duplexer (600) which wirelessly transmits an output signal of a transmitter to a mobile station of a corresponding service area and receives a signal transmitted from the mobile station;

A receiver 500 for amplifying and outputting a signal received from the duplexer 600;

When the power level is coupled to the output signal of the receiver 500 to sense the power level of the receiver 500, and the power level is equal to or greater than the first reference value for the first time or equal to or less than the second reference value for the second time, And a control unit 200 that does not deliver the output to the duplexer 400.

FIG. 2 is a detailed configuration diagram of the control unit of FIG. 1.

2, the control unit 200,

A high level detector 220 coupled to an output of the receiver 500 for sensing a high power level of the receiver 500;

A low level detector 230 coupled to an output of the receiver 500 to sense a low power level of the receiver 500;

If the power level sensed by the high level detector 220 is greater than or equal to the first reference value during the first time period, or the power level sensed by the low level detector 230 is less than or equal to the second reference value during the second time period, the output of the receiver 500 is output. Integrated circuit unit 210 for outputting a control signal so as not to transfer to the duplexer 400;

The switch SW1 transfers or blocks the output signal of the receiver 500 to the duplexer 400 according to the control signal of the integrated circuit unit 210.

The transmitter 100,

Mixer 110 for converting a signal of the high frequency band received from the duplexer 400 to a signal of the intermediate frequency band,

A surface acoustic wave (SAW) filter 120 for filtering to obtain a signal of a desired intermediate frequency band from the output signal of the mixer 110,

A mixer 130 for converting the output signal of the surface acoustic wave filter 120 back into a signal of a high frequency band;

And a power amplifier 140 for amplifying the output signal of the mixer 130 and outputting the amplified signal to the duplexer 600.

The receiving unit 500,

Low noise amplifier 550 for amplifying a high frequency signal input through the duplex 600,

A mixer 540 for modulating the output signal of the low noise amplifier 550 into a signal of an intermediate frequency band;

A surface acoustic wave filter 530 which passes only signals of a desired high frequency band at the output of the mixer 540;

A mixer 520 for modulating an output signal of the surface acoustic wave filter 530 into a signal of a high frequency band;

And a power amplifier 510 for power amplifying and outputting the output signal of the mixer 520.

Then, the operation of the repeater system according to the embodiment of the present invention having such a configuration will be described in detail.

First, a signal of a high frequency band, that is, 1.8 to 1.9 MHz band, is wirelessly received from the base station by the duplexer 400. In this case, a wired signal may be received depending on the repeater.

The signal of the high frequency band input through the duplex 400 is converted into the signal of the intermediate frequency band by the mixer 110. At this time, the mixer 110 receives a signal of the frequency band for the intermediate frequency modulation from the oscillator 300.

Next, only the signals of the intermediate frequency band are passed through the surface acoustic wave filter 120, and the remaining bands are filtered out.

Next, the mixer 130 modulates the output signal of the surface acoustic wave filter 120 into a signal of a high frequency band and outputs the modulated signal. At this time, the mixer 130 is input to the frequency band signal for high frequency modulation from the oscillator 300.

Then, the output signal of the mixer 130 is amplified by the power amplifier 140 and transferred to the duplexer 600.

The duplexer 600 then sends this signal wirelessly to the subscriber's mobile phone via the antenna. The subscriber in the service area then receives this signal.

On the other hand, the signal transmitted from the subscriber's mobile phone is received by the duplexer 600, amplified by the low noise amplifier 550, and then converted by the mixer 540 into a signal of the intermediate frequency band.

Then, the surface acoustic wave filter 530 passes only the signal of the intermediate frequency band in the output signal of the mixer 540.

Next, the mixer 520 modulates the output signal of the surface acoustic wave filter 530 into a signal of a high frequency band and outputs the modulated signal.

Then, the high frequency signal is amplified by the power amplifier 510 and wirelessly transmitted to the base station through the control unit 200 and the duplexer 400.

This process connects the mobile phone with the base station.

However, when there is no subscriber in the service area in this process, the power of the power amplifier 510 is very small, in the case of oscillation, the power is oscillated, in which case the control unit 200 is the reverse channel side, that is, the power amplifier ( The output signal of the 510 is not transmitted to the duplexer 400. Here, the user can adjust the voltages corresponding to the low and high limits using the switches 212 and 216, and enable all of the above functions to prevent oscillation and to automatically cut off the reverse output when the subscriber is not in the area. It can also be enabled / disabled.

Next, the operation of the controller 200 will be described in detail with reference to FIGS. 3 and 4.

3 is a timing diagram illustrating the flow of internal logic of the controller.

First, the high level detector 220 of the control unit 200 becomes a high level at the output of the power amplifier 510 through the coupler 240, that is, the power level of the access signal or the oscillation state when the maximum subscriber is connected. Detect when. Here, the high level detector 220 detects a subscriber's reverse access signal, a call signal, an oscillation signal, and the like, and when the amount of detection exceeds a predetermined reference value (high level detect, a very large access signal or oscillation), the power detector The (Power detect) signal goes high and generates a delayed signal (DELAYED DETECT) which is the same as the power detect signal. At this time, as shown in FIG. 3, while the power detect signal POWER DETECT is high, the delayed signal DELAYED DETECT generates a rising signal for a low time, and vice versa. Generate. The rising signal RISING and the falling signal FALLING are event triggers.

Then, the high limit check unit 215 of the detector check logic unit 210 turns off the switch SW1 immediately after the set time T1 time from the rising signal RISING and generates power for the switch off time T2. Check the level of the detector signal (POWER DETECT). If the level of the power detect signal POWER DETECT is detected high during the time T2, the switch SW1 is turned on because it is not oscillation in this case. Also, if the level of the power detect signal POWER DETECT is sensed low during that time, the switch SW1 is turned off since it is an oscillation in this case. At this time, if the falling signal FALLING occurs before the time T1 after the rising signal RISING, the rising signal RISING is generated again and the switch SW1 is not turned off until the time T1. The reason is that the call signal is not continuously detected due to the high CDMA characteristic, and the oscillation signal is continuously detected as high. After the switch SW1 is turned off by oscillation, when the subscriber accesses the switch SW1, the switch SW1 is turned on again. Even in this case, if several oscillation signals are continuously detected, the system is completely shut down (to protect the base station-if there is a continuous oscillation, something is wrong-the switch (sw1) is not turned on even if the subscriber access). When the high level is detected, the oscillation signal, the terminal access signal, and the terminal call signal are completely distinguished.

This process can be performed either hardware or software, and an operation flowchart for programming it is shown in FIG.

As shown in FIG. 4, the high limit check unit 216 determines whether the power detection signal becomes 0 to 1, that is, high (S402).

Next, the high limit check unit 216 generates a rising signal RISING, determines whether the switch SW1 is on (S404), turns it on if not, and operates a timer for a time T1 ( S405).

Next, the high limit check unit 215 determines whether the power detection signal POWER DETECT is 0 from the rising signal RISING (S407), and if it is 0, generates a polling signal and resets the timer ( S408).

The high limit check unit 215 immediately turns off the switch SW1 after the set time T1 has elapsed since the rising signal RISING has been generated and the power detection signal POWER DETECT is not 0 (S409). The level of the power detection signal POWER DETECT is checked during the off time T2 (S410).

That is, when the level of the power detection signal POWER DETECT is sensed during the time T2 (S411), if it is detected as high, in this case, since the oscillation is not performed, the switch SW1 is turned on (S412).

Also, if the level of the power detect signal POWER DETECT is sensed low during that time, the switch SW1 is turned off since it is an oscillation in this case.

Hereinafter, the operation of the low limit check unit 213 of the controller 200 will be described in detail with reference to FIGS. 5 and 6.

5 is a timing diagram illustrating a flow of a low limit check logic of the controller.

First, the low level detector 230 of the controller 200 senses the output of the power amplifier 510 through the coupler 240 to sense a low level, that is, an output when there is no subscriber at all (relay output is generally Even if there is no signal at all, there is an output level when there is no signal-KTB + repeater gain + repeater noise figure. Here, the low level detector 230 detects the subscriber's reverse access signal and call signal, and no signal output level. When the detection amount is below a predetermined reference value, the subscriber's reverse access signal and call signal are detected. Report that there is no signal (there is only output when there is no signal) Protect the base station reverse by turning off the reverse output. The method generates a rising signal RISING2 and a falling signal FALLING2 in comparison with the delayed signal DELAYED DETECT2 when the predetermined value is higher than a predetermined reference value, and switches the switch SW1 after T3 time after the falling signal FALLING2 is generated. Off.

Thereafter, the switch SW1 is turned on when the rising signal RISING2 is present. This reduces the base station reverse capacity reduction by the repeater because there is no repeater reverse output when there are no subscribers.

Such a process can be executed in hardware or software, and an operation flowchart for programming the same is illustrated in FIG. 6.

As shown in FIG. 6, the low limit checker 213 determines whether the low level detect signal LOW LEVEL DETECT becomes 0 to 1, that is, high (S602).

Next, the low limit check unit 213 generates a rising signal RISING2, determines whether the switch SW1 is on (S604), and if not, turns on the low limit detecting signal LOW LEVEL. DETECT) is determined to be 0 (S606).

When the low level detect signal LOW LEVEL DETECT is 0, the falling signal FALLING2 is generated, and then a timer is operated for a time T3 (S607).

Next, the low limit check unit 213 determines whether the low level detection signal LOW LEVEL DETECT is 1 from after the falling signal FALLING is generated (S608), and if it is 1, generates a rising signal RISING and a timer. Reset (S609).

The low limit checker 213 turns off the switch SW1 immediately after the set time T3 after the falling signal FALLING is generated and the low level detection signal LOW LEVEL DETECT is not 1 (S610). (S620).

The present invention is not limited to the PCS, but can be applied to and used in a general mobile communication system.

As described above, in the embodiment of the present invention, a relay system and a control method for preventing a decrease in base station capacity by protecting the reception path by blocking the reverse output when a time zone and a reverse oscillation without a subscriber in the repeater service area are detected. Can be provided.

Claims (6)

delete A transmitter which amplifies data received from an external base station, converts the data into a service frequency, and wirelessly transmits the data to a mobile station in a corresponding service area;  A receiver for amplifying an access signal and a call signal transmitted from the mobile station and outputting the amplified signal to the base station; Determining the power level of the signal input from the receiver to determine the state of the output of the receiver, if the output state of the receiver is an oscillation state or when there is no subscriber in the service area, the output of the receiver It includes a control unit that does not deliver to the base station, The control unit 200, A high level detector 220 coupled to an output of the receiver 500 to sense a high power level of the receiver 500; A low level detector 230 coupled to an output of the receiver 500 to sense a low power level of the receiver 500; The power level sensed by the high level detector 220 changes to a low state after a predetermined first time that is a time corresponding to a high section of the oscillation at a power state of a high state corresponding to the oscillation, or the low level detector 230. If the detected power level is maintained for a predetermined second time when there is no subscriber using the service, the integrated circuit unit for outputting a control signal so as not to transmit the output of the receiver 500 to the base station ( 210); And a switch (SW1) for switching the output signal of the receiving unit (500) to the base station according to the control signal of the integrated circuit unit (210). delete delete A repeater system control method for amplifying data received from an external base station, converting it to a service frequency, transmitting the signal wirelessly to a mobile station of a corresponding service area, and amplifying the output signal of the mobile station to a base station, Detecting a power level of a reverse output signal output from the repeater to a base station; Blocking the output of the reverse output signal of the repeater if the detected power level is a power level corresponding to a high state at the time of oscillation; After the output of the reverse output signal is cut off, if the power level changes to a low level after a predetermined first time which is a high state holding time of the oscillation, maintaining the reverse output signal of the repeater with the output blocked; If the power level remains high even after the first time, maintaining the repeater outputting a reverse output signal of the repeater.        The method of claim 5, Determining whether the power level is a power level when no subscriber is using a service in the service area; Blocking the reverse output of the repeater if the power level maintains the power level when no subscriber is using the service for a predetermined second time period, which is a criterion for determining when no subscriber is using the service; And maintaining the repeater reverse output using a subscriber access signal when the subscriber attempts to make a call while the reverse output of the repeater is blocked.

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