KR20070092854A - Repeater for setting gain automatically and method - Google Patents

Abstract

A repeater and a method for automatically setting gain are provided to allow a mobile phone service provider to reduce a cost required for installation of a repeater and allow a mobile phone subscriber to easily attach or detach a repeater at a desired place to smoothly receive a mobile phone service. A gain setting unit(223) sets the reverse gain and forward gain of a repeater. A signal detecting unit(224) detects an output signal of the repeater corresponding to the gain set by the gain setting unit(223). A system monitoring unit(225) compares the detected output signal with a certain output value of the repeater in accordance with the forward maximum rated gain. A gain controller(226) finely adjusts the forward gain set by the gain setting unit(223) according to a comparison result of the system monitoring unit(225).

Description

REPEATER FOR SETTING GAIN AUTOMATICALLY AND METHOD}

The following drawings, which are attached in this specification, illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is a schematic diagram of a repeater system according to the prior art;

Figure 2 is an internal configuration of a repeater according to the prior art.

3 is a schematic diagram of an automatic gain setting repeater according to the present invention;

Figure 4 is a flow chart for explaining the automatic gain setting method of the repeater according to the present invention.

Explanation of symbols on the main parts of the drawings

221: donor antenna 222: service antenna

223: gain setting unit 224: signal detection unit

225: system monitoring unit 226: gain control unit

227: storage device

The present invention relates to an automatic gain setting repeater, and more particularly, to an automatic gain setting repeater which automatically sets a system optimum gain and corresponding isolation upon power up.

In general, in order to economically expand coverage in a mobile communication system, a mobile communication repeater (RF repeater, hereinafter referred to as a repeater) is widely used.

The repeater receives the weak base station signal transmitted from the base station through the antenna, amplifies the received signal, and transmits the received signal to the mobile terminal, thereby eliminating small in-building shadows and removing coverage holes. It is used to

1 is a schematic configuration diagram of a general repeater system, and FIG. 2 is an internal configuration diagram of a general repeater.

As shown in FIG. 1, the repeater system receives and amplifies signals from the base station 100, the mobile station 110 for wireless communication with the base station 100, and the base station 100 and the mobile station 110. The repeater 120 transmits to the mobile station 110 or the base station 100. Here, the repeater 120 includes a donor antenna 121 serving as a base station facing antenna and a service antenna 122 serving as a mobile station facing antenna. On the other hand, the donor antenna 121 and the service antenna 122 is a transmission / reception combined antenna.

As illustrated in FIG. 2, the repeater 120 includes a donor antenna 121, a service antenna 122, a first duplexer 123, a forward signal processor 124, a second duplexer 125, and a reverse direction. And a signal processor 126.

The donor antenna 121 receives a signal from the base station 100 by the first duplexer 123, the forward signal processor 124 performs a series of operations such as filtering, frequency conversion and amplification of the received signal Then, it is output to the second duplexer 125. Thereafter, the second duplexer 125 transmits the transmitted signal to the mobile station 110 through the service antenna 125.

Meanwhile, the repeater 120 receives a signal from the mobile station 110 through the service antenna 122 by the second duplexer 125, and the reverse signal processor 126 filters, frequency converts, and amplifies the received signal. A series of operations, such as, and outputs the same to the first duplexer 123. Thereafter, the first duplexer 123 transmits the transmitted signal to the base station 100 through the donor antenna 121.

In the repeater system having the above-described configuration and operation, since there is a forward link for transmitting a signal from the base station 100 to the mobile station 110 and a reverse link for transmitting a signal from the mobile station 110 to the base station 100, both links are provided. It is very important to ensure proper isolation of the liver. In other words, the repeater system is capable of ensuring isolation to minimize the amount of output signal of equipment radiated through the service antenna 122 fed back to the donor antenna 121 when installed in the field. It acts as an important factor.

However, since the conventional repeater 120 has many limitations such as the isolation performance varies depending on the antenna installation method and the installation location, the general mobile telephone subscriber using the conventional repeater 120 directly between antennas. Securing isolation is practically impossible. For this reason, in the case of the conventional repeater provided by the mobile communication service provider, it is troublesome to use a specialized facility company to measure the isolation.

Accordingly, the present invention was created to solve the problems inherent in the prior art as described above, and an object of the present invention is to provide an automatic gain setting repeater and a method for automatically setting an optimized gain of a system.

In order to achieve the above object, according to one aspect of the present invention, there is provided a method for automatically setting a gain of a repeater, the method comprising: a) setting the forward gain to the maximum rated gain with the repeater powered on; b) detecting the output signal of the repeater at the set maximum rated gain and assuming that the detected signal is more than a predetermined output value according to the maximum rated gain, that the repeater is oscillated; c) decreasing and resetting the maximum rated gain set in step a); d) finally setting the forward gain by subtracting a predetermined gain value from the reset maximum rated gain; e) operating the repeater system based on the last set forward gain; and f) if it is not oscillation of the repeater in step b), increasing and resetting the maximum rated gain set in step a) and feeding back to step d).

In the above configuration, g) if the magnitude of the output signal of the repeater having the last set forward gain is variable, it is fed back to step a), and performing the same process.

In the above configuration, the step a) minimizes or shuts down the reverse gain of the repeater.

In the above configuration, the step c) iteratively subtracts the gain of the minimum setting unit from the maximum rated gain set in the step a).

In the above configuration, the step f) repeatedly adds the gain of the minimum setting unit from the maximum rated gain set in the step a).

In the above configuration, step c) may include: c-1) subtracting a gain of the minimum set unit from the maximum rated gain set in step a); c-2) determining whether the repeater is oscillated by comparing the output signal according to the maximum rated gain subtracted by the gain of the minimum setting unit with the predetermined output value; c-3) If it is determined that the repeater does not start, the subtraction stops.

In the above configuration, c-4) when the determination result is the oscillation of the repeater, the step of feeding back to the step c-1) to perform the same process; further includes.

In the above configuration, step f) includes: f-1) adding a gain of the minimum set unit from the maximum rated gain set in step a); f-2) determining whether the repeater is oscillated by comparing the output signal according to the maximum rated gain and the predetermined output value added by the gain of the minimum setting unit; f-3) stopping the adding operation when the repeater starts oscillating.

In the above configuration, f-4) if the determination is not the oscillation of the repeater, the feedback is fed back to the step f-1) to perform the same process.

In the above configuration, step g) generates an alarm when the output signal of the repeater at the last set forward gain is varied and is fed back to step a) to perform the same process.

According to yet another aspect of the present invention, there is provided an automatic gain setting repeater, the repeater comprising: a gain setting unit for setting a reverse gain and a forward gain of the repeater; A signal detector for detecting an output signal of the repeater according to a gain set through the gain setting unit; A system monitoring unit for comparing the detected output signal with a predetermined output value of the repeater according to a forward maximum rated gain; And a gain controller configured to fine-tune the forward gain set through the gain setting unit according to the comparison result of the system monitoring unit.

In the above configuration, the gain setting unit sets the reverse gain to the minimum or shut down state and sets the forward gain to the maximum rated gain.

In the above configuration, the system monitoring unit further includes a separate storage device for storing the predetermined output value according to the forward maximum rated gain.

In the above configuration, when the detected signal is equal to or greater than the predetermined output value, the system monitoring unit repeatedly subtracts the gain of the minimum setting unit through the gain control unit.

In the above configuration, the system monitoring unit repeatedly subtracts the gain of the minimum setting unit until the detected signal becomes less than the predetermined output value.

In the above configuration, when the detected signal is less than the predetermined output value, the system monitoring unit repeatedly adds the gain of the minimum setting unit through the gain control unit.

In the above configuration, the system monitoring unit repeatedly adds the gain of the minimum setting unit until the detected signal becomes equal to or greater than the predetermined output value.

(Example)

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

3 shows a schematic block diagram of an automatic gain setting repeater according to an embodiment of the invention.

As shown in FIG. 3, the repeater 220 is a gain of a forward link, ie, a forward gain, which transmits a signal from a base station 200 to a mobile station 210 through a donor antenna 221 and a service antenna 222. And a gain setting unit 223 for setting a gain of the zero link that transmits a signal from the mobile station 210 to the base station 200, that is, a reverse gain. A signal detector 224 for detecting an output signal of the repeater 220 according to the forward gain set through the gain setting unit 223; A system monitoring unit (225) for comparing the detected output signal with a predetermined output value according to a forward maximum rated gain stored separately; And a gain controller 226 for fine-adjusting the forward gain set on the gain setting unit 223 according to the comparison result of the system monitoring unit 225.

The gain setting unit 223 sets the reverse gain to the minimum or shut down state when the initial repeater 220 is powered on, and simultaneously sets the forward gain to the maximum rated gain. This is to detect only the forward isolation, and is to prevent the isolation check error due to the internal oscillation of the repeater 220 which may be caused by the reception noise affecting the base station 200 when setting the reverse gain.

The signal detector 224 detects an output signal of the repeater 220 according to the forward maximum rated gain set through the gain setting unit 223 on the service antenna 222.

The system monitoring unit 225 further includes a separate storage device 227 for storing a predetermined output value of the repeater 220 according to the forward maximum rated gain. In addition, when the detected output signal is greater than or equal to a predetermined output value stored in the storage device 227, the system monitoring unit 225 outputs the output signal of the repeater 220 through the gain control unit 226 to the predetermined output value. The gain in the minimum set unit is repeatedly subtracted from the forward maximum rated gain until it is below. In addition, when the detected output signal is less than the predetermined output value, the gain control unit 227 of the minimum setting unit at the forward optimum rated gain until the detected output signal is greater than or equal to the predetermined output value. The gain is repeatedly added to yield an optimum gain.

Hereinafter, an automatic gain setting method of a repeater according to an embodiment of the present invention will be described with reference to FIG. 4. 4 is a flowchart illustrating an automatic gain setting method of a repeater according to an exemplary embodiment of the present invention.

First, the forward gain of the repeater 220 is set to the maximum rated gain through the gain setting unit 213 in a state where the power of the repeater 220 is applied (S110-S120). In this case, the gain setting unit 210 sets the reverse gain of the repeater 220 to a minimum or shutdown state to prevent an isolation check error due to the internal oscillation of the repeater 220.

Subsequently, the signal detector 214 detects an output signal of the repeater 220 according to the set maximum rated gain, and the system monitor 225 converts the detected signal into a predetermined output value according to the maximum rated gain. In comparison, it is determined whether the repeater oscillates (S130). That is, the system monitoring unit 225 determines that the system is oscillated when the detected output signal is equal to or larger than the predetermined output value.

Thereafter, the system monitoring unit 225 repeatedly adds or subtracts a gain of a minimum setting unit from the maximum rated gain set through the gain control unit 226 according to the determination result. That is, in the case of oscillation of the repeater 220, the gain of the minimum setting unit, for example, 1 dB is subtracted from the set maximum rated gain (S140). Then, it is determined whether the repeater 220 is oscillated again by comparing the output signal of the repeater 220 according to the maximum rated gain subtracted with the 1 dB and the predetermined output value (S150). Thereafter, when the determination result is not the oscillation of the repeater 220, the subtraction operation is stopped, and in the case of the oscillation of the repeater 220, the process is fed back to step S140 to perform the same process. On the other hand, in step S130, when the oscillator 220 is not oscillated, the gain of the minimum set unit, for example, 1 dB is added to the set maximum rated gain (S160). Then, it is determined whether or not the repeater 220 is oscillated by comparing the output signal of the repeater 220 according to the maximum rated gain to which the 1 dB is added and the predetermined output value (S170). Subsequently, in the determination result, when the oscillator 220 is oscillated, the addition operation is stopped. On the other hand, when the repeater 220 is not oscillated, it is fed back to step S160 to perform the same process.

Thereafter, the system monitoring unit 225 finally sets the forward gain by subtracting a predetermined gain value from the maximum rated gain reset through the steps 'S140-S170' (S180). That is, the system monitoring unit 225 finally sets the forward gain by subtracting a predetermined gain, for example, 15 dB from the reset maximum rated gain through the gain control unit 226.

Then, the repeater 220 is operated based on the finally set forward gain to provide a relay service (S200).

On the other hand, the system monitoring unit 225 continuously monitors the magnitude of the output signal according to the last set forward gain, and if the magnitude is changed, generates an alarm and is fed back to step S120 to process the same process. It performs (S190-S191). That is, when the isolation is changed due to disturbance such as the position change of the donor antenna 211 or the service antenna 222, the repeater 220 changes the magnitude of the output signal at the same gain. Therefore, the system monitoring unit 225 continuously monitors the output signal according to the finally set forward gain, and resets the forward gain of the repeater 220 when the magnitude is different.

As can be seen from the above, the automatic gain setting repeater according to the present invention automatically sets the gain of the repeater, so that a general mobile telephone subscriber can easily install the repeater system. Therefore, the mobile phone operator can reduce the cost associated with the installation of the repeater, and the mobile phone subscriber can be provided with the mobile phone service smoothly by detaching and attaching the repeater to the desired place in the house.

Although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

Claims (17)

a) setting the forward gain to the maximum rated gain with the repeater powered on; b) detecting the output signal of the repeater at the set maximum rated gain and assuming that the detected signal is more than a predetermined output value according to the maximum rated gain, that the repeater is oscillated; c) decreasing and resetting the maximum rated gain set in step a); d) finally setting the forward gain by subtracting a predetermined gain value from the reset maximum rated gain; e) operating the repeater system based on the last set forward gain; f) if it is not oscillation of the repeater in step b), increasing and resetting the maximum rated gain set in step a) and feeding back to step d); How to set up. The method of claim 1, g) if the magnitude of the output signal of the repeater having the last set forward gain is varied, feeding back to the step a) and performing the same process; . The method of claim 1 or 2, wherein the step a) comprises: Automatic gain setting method of the repeater, characterized in that for minimizing or shutting down the reverse gain of the repeater. The method of claim 1 or 2, wherein step c) comprises: And automatically subtracting the gain of the minimum setting unit from the maximum rated gain set in step a). The method of claim 1 or 2, wherein f) And repeatingly adding the gain of the minimum setting unit to the maximum rated gain set in step a). The method of claim 4, wherein step c) c-1) subtracting the gain of the minimum setting unit from the maximum rated gain set in step a); c-2) determining whether the repeater is oscillated by comparing the output signal according to the maximum rated gain subtracted by the gain of the minimum setting unit with the predetermined output value; c-3) The automatic gain setting method of the repeater, characterized in that the subtraction operation is stopped when the determination result is not the oscillation of the repeater. The method of claim 6, c-4) if the determination resulted in the oscillation of the repeater, feeding back to the step c-1) and performing the same process. The method of claim 5, wherein f), f-1) adding a gain of the minimum setting unit from the maximum rated gain set in step a); f-2) determining whether the repeater is oscillated by comparing the output signal according to the maximum rated gain and the predetermined output value added by the gain of the minimum setting unit; f-3) stopping the addition operation when the repeater starts oscillating the automatic gain setting method of the repeater. The method of claim 8, f-4) if it is determined that the repeater is not oscillating, feeding back to the step f-1) to perform the same process; the automatic gain setting method of the repeater system further comprising. The method of claim 1 or 2, wherein g) is When the output signal of the repeater at the last set forward gain is varied, generates an alarm and is fed back to step a) to perform the same process. In the automatic gain setting repeater, A gain setting unit for setting a reverse gain and a forward gain of the repeater; A signal detector for detecting an output signal of the repeater according to a gain set through the gain setting unit; A system monitoring unit for comparing the detected output signal with a predetermined output value of the repeater according to a forward maximum rated gain; And And a gain control unit for fine-adjusting the forward gain set through the gain setting unit according to the comparison result of the system monitoring unit. The method of claim 11, wherein the gain setting unit, Setting a reverse gain to a minimum or shut down state and setting the forward gain to a maximum rated gain. The method of claim 11, wherein the system monitoring unit, And a separate storage device configured to store the predetermined output value according to the forward maximum rated gain. The system monitoring unit of claim 11 or 13, And if the detected signal is equal to or greater than the predetermined output value, repeatingly subtracting the gain of the minimum setting unit through the gain control unit. 15. The system of claim 14, wherein the system monitoring unit, And repeatedly subtracting the gain of the minimum setting unit until the detected signal is less than the predetermined output value. The system monitoring unit of claim 11 or 13, And if the detected signal is less than the predetermined output value, repeatingly adding the gain of the minimum setting unit through the gain control unit. The method of claim 16, wherein the system monitoring unit, And repeatingly adding the gains of the minimum setting unit until the detected signal becomes equal to or greater than the predetermined output value.

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