KR20080056358A - Wireless communication repeater and method for controlling isolation insurance in the wireless communication repeater - Google Patents

Abstract

An RF repeater and a control method for ensuring the isolation thereof are provided to always ensure a stable isolation value by monitoring a change in the isolation between a donor antenna and a service antenna and adjusting their locations. An RF repeater comprises an RF module(22), an uplink power detector(86), an antenna location change unit(10), and a control unit(98). The RF module has a downlink relay circuit and an uplink relay circuit. The downlink relay circuit processes a downlink RF signal, received through a donor antenna(24) from a base station, and relays it to a wireless communication terminal through a service antenna(26). The uplink relay circuit processes an uplink RF signal, received through the service antenna from the wireless communication terminal, and relays it to the base station. The uplink power detector detects a noise level for the uplink relay circuit. The antenna location change unit modifies the location of either the donor antenna or the service antenna. In case the detected noise level exceeds a preset level value, the control unit judges that the isolation has been changed. In this case, the control unit controls the antenna location change unit to modify the location of either the donor antenna or the service antenna and to secure a target isolation.

Description

Wireless Communication Repeater and Method for Controlling Isolation Insurance in the Wireless Communication Repeater}

1 is a view showing a state in which a repeater is installed in a building in a conventional wireless communication system by way of example,

2 is a block diagram of a wireless communication repeater according to an embodiment of the present invention.

3A to 3E are views including an example of an antenna position changing unit of the wireless communication repeater of FIG.

4 and 5 are views including another example of the antenna position changing unit of the wireless communication repeater of FIG.

FIG. 6 is a flowchart illustrating an operation flow for an isolation securing control method of a wireless communication repeater according to the present invention.

* Explanation of symbols for the main parts of the drawings

22: RF module, 24: donor antenna,

26: service antenna, 30,58: duplexer,

32,60: low noise amplifier (LNA), 34,62: RF amplifier,

36,48: Tx band pass filter, 38,66: down converter,

40, 68, 76: intermediate frequency amplifier, 42, 70: intermediate frequency filter,

44,72,74: attenuator, 46,78: upconverter,

50,82: power amplifier, 52,84: coupler,

54,86: power detector, 56,88: RF switch,

98: control unit, 64, 80: Rx band pass filter.

10: antenna position changing unit

The present invention relates to a wireless communication repeater for relaying a radio frequency (RF) signal in a wireless communication network and to a method for ensuring isolation of the wireless communication repeater.

In general, in a wireless communication network such as a mobile communication network, even in a base station coverage that can be covered by a base station that directly communicates an RF signal with a wireless communication terminal held by a subscriber, there is a shaded area where smooth communication is difficult in the building.

In order to eliminate such shaded areas, a conventional repeater device is installed in the shaded area so as to relay RF signals between the base station and the wireless communication terminal.

That is, FIG. 1 is a diagram illustrating a state where a repeater is installed in a building in a conventional wireless communication system.

As shown in FIG. 1, the main body 4 of the RF repeater for relaying the RF signal between the base station 1 and the wireless communication terminal is installed inside the building 2, but the base station 1 and the RF A donor antenna 6 for transmitting / receiving a signal is installed outdoors when connected to a corresponding RF repeater 4 with an RF cable, and transmits / receives an RF signal with a wireless communication terminal located in a building. The antenna 8 is attached to the main body 4 side of the RF repeater located in the building.

In the case of such an RF repeater, the isolation between the donor antenna and the service antenna should be secured 15 dB or more above the gain of the corresponding RF repeater to prevent oscillation or a rise in noise level to ensure stable service. Repeater Gain + 15dB or more (Isolation Margin).

On the other hand, when the noise level of the RF repeater is increased because the isolation between the donor antenna and the service antenna is not secured to be 15 dB or more, the base station cell coverage is reduced by reducing the reception sensitivity of the neighboring base station, or the RF repeater The oscillation increases the possibility of damaging the base station.

Therefore, in the conventional RF repeater, in order to ensure sufficient isolation between the donor antenna and the service antenna, as shown in FIG. 1, the donor antenna 6 is installed outside the building at a predetermined distance from the main body 4 of the RF repeater. In addition, the RF repeater main body 4 and the service antenna 8 to be installed inside the building.

That is, by physically spaced apart the donor antenna and the service antenna, a free space loss between each antenna is secured, and the isolation can be secured by 15 dB or more than the RF repeater gain.

However, in the conventional wireless communication system, since the donor antenna is connected to the RF repeater to be spaced apart from the RF repeater to be installed outside the building, an RF cable connecting the donor antenna to the RF repeater main body; An accessory material, such as a bracket, is required to mount the donor antenna, and a separate professional repeater installer needs to be installed, resulting in additional material costs and labor costs.

On the other hand, the isolation of the repeater changes according to the change in the surrounding environment, because the signal output from the donor antenna is reflected through the multipath and fed back to the service antenna. Because it occurs.

That is, when the movement path of the signal output from the donor antenna and fed back to the service antenna changes with the surrounding environment change, the phases of the multipath signals input to the service antenna change with each other. Path signals can be canceled or enhanced. This reinforcement or cancellation of the fed back multipath signal changes the isolation of the repeater.

However, in the conventional wireless communication system, although the isolation between the donor antenna and the service antenna is stably secured during the initial installation of the RF repeater, the phase of the multipath signal fed back due to the change of the surrounding environment is changed as described above. Accordingly, when the isolation between the donor antenna and the service antenna is changed, there is a problem that stable service of the RF repeater is impossible.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a donor antenna and a service antenna integrally coupled to a main body of an RF repeater, and an isolation control method of the wireless communication repeater. To provide.

Another object of the present invention is to provide a wireless communication repeater and a method for securing isolation of the wireless communication repeater so that a stable isolation value is always ensured by monitoring the position of the isolation change between the donor antenna and the service antenna. will be.

In order to achieve the above object, a wireless communication repeater according to the present invention processes a forward RF signal received through a donor antenna from a base station and relays it to a wireless communication terminal through a service antenna and a service antenna from the wireless communication terminal. A wireless communication repeater having an RF module having a reverse signal path for processing a reverse RF signal received through a relay to a base station through a donor antenna, comprising: detecting means for detecting a noise level for the reverse signal path; Antenna position changing means for changing a position of at least one of the donor antenna and the service antenna; If it is determined that the noise level detected by the detection means is greater than a preset level setting value, the isolation is varied, the antenna position changing means is controlled to change the position of at least one of the donor antenna and the service antenna to achieve a target isolation. And control means for securing.

In addition, in order to achieve the above object, the isolation control method for a wireless communication repeater according to the present invention comprises a donor antenna and a service antenna, and processes a reverse RF signal received through a service antenna from a wireless communication terminal to the donor antenna. In the wireless communication repeater for relaying to the base station side through the RF signal received from the wireless communication terminal through the service antenna and relayed to the base station through the donor antenna, according to the phase change of the signals input to the service antenna If the isolation between the donor antenna and the service antenna is not secured, the isolation between the donor antenna and the service antenna is secured by changing the position of at least one of the donor antenna and the service antenna.

In addition, in order to achieve the above object, a method for securing an isolation of a wireless communication repeater according to the present invention is to process a reverse RF signal received from a wireless communication terminal through a service antenna and relay the reverse RF signal to a base station through a donor antenna. Detecting a noise level for the first step; A second step of comparing the detected noise level with a preset level setting value and determining whether the noise level has increased above the level setting value; A third step of changing the position of at least one of the donor antenna and the service antenna when it is determined that the noise level detected by the detection means is greater than a preset level setting value and the isolation is changed; By detecting the noise level and comparing it with the level set value, the donor antenna and the service antenna are changed positions of the donor antenna and the service antenna until the noise level does not increase above the level set value. It includes a fourth step to ensure the target stable isolation.

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

Here, in describing the embodiments of the present invention, the same components are described using the same reference numerals, and description thereof may be omitted.

As shown in FIG. 2, the wireless communication repeater according to an embodiment of the present invention includes a donor antenna 24, a service antenna 26, an RF module 22, and an antenna position changing unit 10.

The donor antenna 24 is an antenna for transmitting / receiving an RF signal with a base station, and the service antenna 26 is an antenna for transmitting / receiving an RF signal with a wireless communication terminal.

The RF module 22 processes the forward RF signal received from the base station through the donor antenna 24 and relays it to the wireless communication terminal through the service antenna 26, and the service antenna 26 from the wireless communication terminal. It includes a reverse relay circuit for processing the reverse RF signal received through the donor antenna 24 to the base station side, and the control unit 98.

Here, the forward relay circuit includes a donor duplexer 30, a low noise amplifier (LNA) 32, an RF amplifier 34, a Tx band pass filter (BPF) ( 36, forward down converter 38, intermediate frequency amplifier (IF Amp) 40, intermediate frequency filter 42, forward attenuator 44, forward up converter 46, Tx bandpass filter ( 48, a power amplifier 50, a coupler 52, a forward power detector 54, and a forward RF switch 56. For the forward relay circuit, since each component corresponds to a conventional circuit configuration, a detailed description of each component will be omitted.

In addition, the reverse relay circuit includes a service duplexer 58, a low noise amplifier (LNA) 60, an RF amplifier 62, an Rx bandpass filter (Rx BPF) 64, and a reverse down converter ( 66), intermediate frequency amplifier 68, intermediate frequency filter 70, first reverse attenuator 72, second reverse attenuator 74, intermediate frequency amplifier 76, reverse upconverter 78, Rx bandpass Filter 80, power amplifier 82, coupler 84, reverse power detector 86, reverse RF switch 88, and the like. Description of the components corresponding to the known techniques among the components of the reverse relay circuit can be omitted.

The first reverse attenuator 72 increases the gain of the reverse signal under the control of the controller 98 to be described later so that isolation can be ensured, and the second reverse attenuator 74 adjusts the gain of the reverse signal. It is for.

The reverse power detector 86 detects a signal level of the reverse signal from the coupler 84 and a noise level when no signal is provided to the control unit 98.

On the other hand, the control unit 98 measures the noise level at the no signal detected by the reverse power detector 86, and when the rising state of the noise level is detected, it controls the antenna position changing unit 10 and the donor antenna 24 and The position of at least one of the service antennas 26 is changed.

A portion of the RF signal output from the donor antenna 24 is fed back and reflected into the service antenna 26 through the multipath. When the position of the antenna is changed under the control of the controller 98 as described above, The phase of the incoming feedback signal changes and thus reinforcement or cancellation occurs between the feedback signals.

That is, when the moving distance of the multipath wave fed back from the donor antenna to the service antenna changes as the antenna is changed, the phases of the multipath wave entering the service antenna are changed and the signal is reinforced between the multipath waves having the changed phase. Offset occurs.

 If the multipath reflected wave signals fed back from the donor antenna 24 to the service antenna 26 cancel each other, isolation between the donor antenna 24 and the service antenna 26 may be secured.

That is, if the phase of the multipath reflected waves fed back from the donor antenna 24 to the service antenna 26 can be canceled as much as possible, the isolation between the donor antenna 24 and the service antenna 26 can be easily secured.

Here, the position change width of the antenna may correspond to one wavelength length of the RF signal frequency output by the repeater. For example, if you use a frequency of 2GHz, you can move the antenna within the 15cm range because one wavelength of that frequency is 15cm. In this case, it is experimentally possible to obtain a 10dB isolation effect only by moving within the 3cm range.

Meanwhile, the controller 98 compares the noise level detected by the power detector 86 with a predetermined level setting value to determine whether the antenna position is changed, and the predetermined level setting value is a thermal noise level, a gain, and a noise figure. It may correspond to the sum of.

Here, the thermal noise level is a constant having -174 dBm per Hz as a thermal noise power generated in a corresponding frequency band, and the gain corresponds to its own fixed gain in the corresponding RF module. An index representing an output side signal-to-noise ratio (SNR) with respect to the input side signal-to-noise ratio (SNR) of the RF device.

In general, if the gain of the RF module 22 is equal to the isolation between each antenna, the noise level is increased or oscillated. If the isolation between each antenna is secured 15 dB or more than the gain of the RF module 22, the noise level is increased and oscillated. You can stop it. To use this, the control unit 98 controls the first reverse attenuator 72 to increase the gain of the reverse path by 15 dB, and in this state, the control unit 98 detects no signal detected by the reverse power detector 86. If the noise level at the time does not increase or oscillates above the level set value (thermal noise level + gain + noise figure), it is determined that "gain + 15 dB" corresponding to the target isolation is secured.

On the other hand, if the level of the signal detected by the reverse power detector 86 is kept below a predetermined value, the control unit 98 turns off the reverse RF switch 88 to enter a sleep mode, which is unnecessary. Prevents radiation of RF power. The predetermined value may correspond to a margin of thermal noise level + gain + noise figure + 5 dB.

Here, the control unit 98 determines whether the noise level at the time of the no signal has increased above a specific level value such as 3 dB or more, just before entering the sleep mode, and increases it to 3 dB or more, and the donor antenna 24 and the service antenna. After changing the position of at least one of (26) to find the position where the noise level decreases to 3 dB or less, the system enters the sleep mode.

The specific level value is for correcting to compensate for an error (about 0.5 dB) possessed by the reverse power detector 86 and a temperature change detected through a thermistor (not shown) on the RF path of the corresponding RF module. It corresponds to the level value of the sum of the corrections (approximately 1 to 2 dB) and can be set differently depending on the use condition and scale of the repeater, but is usually defined as 3 dB.

On the other hand, the antenna position changing unit 10 is for changing the position of at least one of the donor antenna 24 and the service antenna 26 as described above. The antenna position changing unit 10 may include a motor driving unit 11, a motor 12, and an antenna moving mechanism 13.

The motor driving unit 11 drives the motor 12 to reverse rotation or forward rotation under the control of the control unit 98 described above. In addition, the motor driver 11 may include a circuit that protects the controller 98 from an instantaneous voltage fed back from the motor 12. To this end, the motor driving unit 11 may include a resistor, a switching device, a diode device and the like. Here, the motor 12 may be various types such as a DC motor, an AC motor, a BLDC motor, and a step motor.

The antenna moving mechanism 13 is configured to change the position of at least one of the donor antenna 24 and the service antenna 26 according to the rotational motion of the motor 12.

The configuration of such an antenna position changing unit 10 and its control process will be described later by way of example.

Hereinafter, with reference to the drawings will be described embodiments of the structure for moving the antenna of the wireless communication repeater according to the present invention integrally configured.

Referring to the cutaway perspective view of Figure 3a and exploded perspective view of Figure 3b, the wireless communication repeater according to an embodiment of the present invention is composed of an upper frame 100 and a lower frame 200.

The upper frame 100 is provided with a groove 123 in which the donor antenna 111 is mounted, a groove 122 in which the service antenna 112 is mounted, and a groove 124 in which the RF module is mounted, thereby forming a corresponding antenna and module. Can be fixed fixed. Although the bottom surface on which the RF module is mounted is not shown, it may be provided in the form of a flat panel, and the flat panel may have a through hole (not shown) for a cable connecting the RF module and the motor driver 210.

The upper frame 100 and the lower frame 200 are coupled to each other by the protrusion 125 formed in the upper frame 100 and the groove 241 formed in the lower frame 200, respectively, in the coupled state motor 220 According to the rotation of the upper frame 100 can move in a straight direction (in this embodiment diagonally). Accordingly, the positions of the donor antenna 111 and the service antenna 112 mounted on the upper frame 100 are changed, and as a result, the influence between the donor antenna 111 and the service antenna 112 is minimized by minimizing the influence of the multipath reflection wave. Can be secured.

In order to change the rotation of the motor 220 in a linear motion of the upper frame 100 (in the present embodiment, the diagonal direction), the upper frame in which the worm gears 231 and 232 meet the upper side of the lower frame 200 in the motor 220. The rack gear 121 may be installed on the bottom surface 120 of the 100.

The worm 231 mounted on the drive shaft 221 of the motor 220 transmits the rotational motion of the motor 220 to the worm wheel 232 which is twisted in the 90 degree direction, and the worm wheel 232 transmits the received rotational motion. It transfers to the rack gear 121 is attached to the bottom of the upper frame (100). Accordingly, the rack gear 121 has a linear motion (in this embodiment, an oblique direction) and the positions of the donor antenna 111 and the service antenna 112 attached to the upper frame 100 may be changed.

Here, the rack gear 121 is mounted on the lower surface 120 of the upper frame 100 in an oblique direction with respect to the vertical plane as shown in Figure 3a and 3b, the donor antenna (mounted to the upper frame 100 ( 111 and the service antenna 112 may move in an oblique direction with respect to the vertical plane according to the rotation of the motor 220.

3C is before the positions of the upper frame 100, that is, the donor antenna 111 and the service antenna 112 are changed, FIG. 3D is a state changed in a left diagonal direction according to the rotation of the motor in one direction, and FIG. 3E is a motor It has been changed to the right diagonal direction by rotating in the other direction. Such movement in the left and right directions is performed by reverse rotation or forward rotation driving of the motor 12 DLM to the motor driving unit 210 according to the control signal of the control unit 98 transmitted through the motor driving unit 210 described above. .

Based on the signal from the motor rotation amount detection unit installed on the shaft of the motor, not shown, the control unit 98 stores the connection position value of the rack gear and the worm gear of the upper frame 100 and changes the motor rotation direction (positive direction) according to the position value. / Reverse direction) can be selected.

In addition, although not shown in the drawing, a limit switch is installed on the lower frame 200 so that when the upper frame 100 moves by a predetermined predetermined area to operate the limit switch, the control unit 98 transmits the signal to stop the movement. As a result, it is possible to prevent the upper frame 100 from moving out of the predetermined movement area.

Hereinafter, another embodiment of a wireless communication repeater according to the present invention will be described with reference to FIG. 4. In this embodiment, only a simple configuration is shown to show an example in which the positions of the donor antenna and the service antenna are changed according to the rotation of the motor and the motor. The same also applies to other embodiments.

As shown, the wireless communication repeater includes a horizontal panel 426 on which the donor antenna 111_3 and the service antenna 112_3 are mounted, and a fixed end (not shown) on which the motor 420 is mounted.

A pair of vertical bevel gears 422 mounted to the motor 420 and the vertical bevel gears 422 rotated to rotate the motor 420 to a linear movement of the horizontal panel 426. A pair of pinions 424 mounted to the other end of the horizontal bevel gear 427, the shaft 423 of the horizontal bevel gear 424, and the pinion 424 mounted on one side of the horizontal panel 426 And a pair of rack gears 425 meshed with each other.

When the motor 420 is driven by the motor driving unit 11 under the control of the controller 98 and the drive shaft 421 of the motor 420 rotates, the vertical bevel gear 422 mounted on the drive shaft 421 rotates. When the horizontal bevel gear 427 meshed with the vertical bevel gear 422 in a 90 degree direction rotates, the pinion 424 attached to the other end of the shaft 423 of the horizontal bevel gear 427 rotates. Accordingly, the rack gear 425 provided at one end of the horizontal panel 426 on which the donor antenna 111_3 and the service antenna 112_3 are mounted and engaged with the pinion 424 has a fixed end (US) mounted with the motor 420. Linear motion). Therefore, as the motor 425 rotates, the donor antenna 111_3 and the service antenna 112_3 make a linear movement in the vertical direction. For example, when the drive shaft 421 of the motor 420 rotates in the clockwise direction, the donor antenna 111_3 and the service antenna 112_3 move upward, and the drive shaft 421 of the motor 420 rotates counterclockwise. When the donor antenna 111_3 and the service antenna 112_3 proceeds in the downward direction.

Hereinafter, another embodiment of a wireless communication repeater according to the present invention will be described with reference to FIG. 5.

As shown, the wireless communication repeater includes a rotating panel 324 on which the donor antenna 111_2 and the service antenna 112_2 are mounted, and a fixed end (not shown) on which the motor 320 is mounted.

The rotary panel 324 is provided with a coupling hole 322, the key groove is formed in contact with the inner peripheral surface, the drive shaft 321 of the motor is coupled to the coupling hole 322, the drive shaft and the rotation panel of the motor coupled A bolt 323 is provided to fix the bolt.

In this case, a key (not shown) corresponding to the key groove of the coupling hole 322 may protrude from the driving shaft 321 of the motor 320.

Accordingly, when the driving shaft 321 of the motor 320 rotates under the control of the controller 98, the rotation panel 324 rotates with respect to a fixed end (not shown) on which the motor 320 is mounted. The donor antenna 111_2 and the service antenna 112_2 attached to the 324 rotate.

As such, the location of the donor antenna 24 and the service antenna 26 is changed, so that the control unit 98 can find a location where the isolation is secured, and provides a relay service at the location where the isolation is secured, thereby making a call between the wireless communication terminal and the base station. It is possible to improve the quality and further to prevent damage to the base station due to oscillation or the like.

In the above-described embodiment, the donor antenna and the service antenna are mounted on the same frame or panel, so that the donor antenna and the service antenna move together according to the rotation of the motor, but the donor antenna and the service antenna are configured to move separately. Of course it can. In addition, although the motor is assumed as a component of the antenna position changing unit, any means for changing the position of at least one of the donor antenna and the service antenna under the control of the controller is included in the present invention.

Next, the operation of the present invention made as described above will be described in detail with reference to the flowchart of FIG. 6.

First, in a state where power is supplied by turning on the power of the wireless communication repeater (step S10), the wireless communication repeater control unit 98 turns off the forward RF switch and turns on the reverse RF switch 88, The reverse power detector 86 is controlled to detect the reverse noise level at no signal (step S11).

At this time, if the isolation between each antenna is secured 15dB or more than the gain of the RF module 22, the controller 98 can prevent the rise and the oscillation of the noise level. Attenuator 72 is controlled to increase the gain of the reverse path by 15 dB above the gain of the forward path.

In this state, the controller 98 compares the no-noise reverse noise level detected from the reverse power detector 86 with a preset level set value (thermal noise level + gain + noise figure) to determine whether target isolation is secured. (Step S12).

If it is determined that the target noise is not secured because the reverse noise level increases when the signal is not set, the control unit 98 changes the antenna position while turning off both the forward RF switch 56 and the reverse RF switch 88. After controlling the unit 10 to change the position of at least one of the donor antenna 24 and the service antenna 26 (step S13), the power detector 86 changes in accordance with the movement of the antenna. The backward noise level is detected (step S14).

The control unit 98 compares the reverse noise level at the time of no signal changed by the position change of the antennas 24 and 26 with the level set value (thermal noise level + gain + noise figure) to determine whether a target isolation is secured. It judges (step S15). If it is determined that the measured noise level is greater than the level set value and the target isolation is not secured, the control unit repeatedly performs the process of step S14 in step S13. In this case, as described above, the moving direction of the antenna may be moved in any of oblique, vertical and horizontal directions, and the moving method may be based on linear motion or rotational motion.

However, according to the determination result of the step S15, when it is determined that the target isolation is secured because the reverse noise level at the no signal is not greater than the level set value, the control unit 98 operates the wireless communication repeater normally. It is determined that this state is possible (step S16). In this case, the forward and reverse RF switches 56 and 88 may be turned on.

On the other hand, the control unit 98 enters the sleep mode when the reverse noise level at the no signal detected by the reverse power detector 86 is lower than or equal to a preset value (ie, thermal noise level + gain + noise figure + 5 dB margin). It is determined whether to enter (step S17).

As a result of the determination, when the reverse noise level at the no signal becomes less than or equal to a preset setting value, the control unit 98 determines that the reverse noise level at the no signal is a specific level value (for example, before entering the sleep mode). 3 dB) or more (step S18).

As a result of the determination, when the reverse noise level at the time of no signal has been increased above a specific level value, the controller 98 turns on the forward RF switch 56 and the reverse RF switch 88, respectively, and the antenna position changing unit 10. Is controlled to change the position of at least one of the donor antenna 24 and the service antenna 26 to reduce the increase (3dB) of the reverse noise level (step S19).

However, if it is determined in step S18 that the backward noise level at the time of no signal has not increased above a specific level value, the controller 98 turns off the reverse RF switch 88 to enter a sleep mode, thereby unnecessary RF power. Copying is prevented (step S20).

On the other hand, the control unit 98 receives a signal from the wireless communication terminal through the service antenna 26 during the antenna position change or in the sleep mode to reduce the increase of the specific level value or more for the reverse noise level at the time of no signal It is judged whether or not it is (step S21).

As a result of the determination, if it is determined that the signal from the wireless communication terminal is not received, the controller 98 determines whether the increase of the noise level at the no signal is reduced by changing the antenna position (step S22), and if it is determined that the signal has not been reduced. In step S19, the antenna position is repeatedly changed to reduce the noise level when no signal is detected. If it is determined that the signal is reduced, the process proceeds to the step S20 to enter the sleep mode.

However, when a signal from the wireless communication terminal is received during the antenna position change to decrease the increased specific level value as a result of the determination of step S21, the controller 98 restores the antenna position to the original position before the change (step S23). In step S16, the wireless communication repeater may enter a normal operation state.

On the other hand, when it is determined in step S21 that the signal from the wireless communication terminal is received in the sleep mode entry state, the controller 98 enters the normal operation state.

Although some embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that modifications may be made to the embodiment without departing from the spirit or spirit of the invention. . In particular, the isolation control method of the wireless communication repeater according to the present invention can change the position of the antenna so that the noise level is measured and the isolation is secured not only when the repeater is installed but also when the repeater is operated.

It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

As described above, according to the present invention, the donor antenna and the service antenna of the wireless communication repeater are integrated with the RF module built in the repeater main body so that they can be embedded in the main body, so that the repeater can be easily installed and the installation cost is improved. Can be reduced.

Also, by detecting the reverse noise level when no signal of the repeater is detected and monitoring the fluctuation of the isolation, the position of the antenna is changed to secure the target stable isolation. The effect is adjusted to the target isolation. That is, by physically changing the position of at least one of the donor antenna and the service antenna, it is possible to minimize the effects of noise caused by the multipath echoes fed back from the donor antenna to the service antenna.

Claims (21)

Processes the forward RF signal received from the base station through the donor antenna and relays it to the wireless communication terminal through the service antenna, and processes the reverse RF signal received from the wireless communication terminal through the service antenna to the base station through the donor antenna. In a wireless communication repeater having an RF module having a reverse signal path relayed to the side, Detection means for detecting a noise level for the reverse signal path; Antenna position changing means for changing a position of at least one of the donor antenna and the service antenna; If it is determined that the noise level detected by the detection means is greater than a preset level setting value, the isolation is varied, controlling the antenna position changing means to change the position of at least one of the donor antenna and the service antenna so that a target isolation is achieved. And a control means for securing the radio communication repeater. The method of claim 1, And the detecting means detects a no-noise noise level for the reverse signal path without disconnection of the signal during repeater operation. The method of claim 2, The level set value preset by the control means, Thermal noise level, which represents the noise power due to heat occurring in the frequency band, the gain of the repeater itself, and the output signal-to-noise ratio (SNR) for the input signal-to-noise ratio (SNR) of the device. A wireless communication repeater, characterized in that the signal level is the sum of the noise figure (Noise Figure). The method of claim 3, And further comprising an attenuator for forcibly increasing the gain of the signal for measurement of the noise level, The control means controls the attenuator to increase the gain by a predetermined gain, and then determines that isolation is not secured if the noise level detected by the detection means increases above a preset level setting value. Communication repeater. The method of claim 4, wherein The antenna position changing means, A motor; A motor driver for driving the motor according to the control of the control means; And an antenna moving mechanism connected to the motor to move at least one of the donor antenna and the service antenna according to the operation of the motor. The method of claim 5, And the at least one of the donor antenna and the service antenna moves in any one direction of vertical position movement, horizontal position movement, and oblique position movement by the antenna movement mechanism. The method of claim 6, An upper frame mounted with at least one of the donor antenna and the service antenna; A lower frame on which the motor is mounted, The antenna moving mechanism is mounted on the worm gear mounted to the motor to convert the rotational motion of the motor into the linear motion of the upper frame, and is mounted on the lower surface of the upper frame which meets the upper side of the lower frame so as to be engaged with the worm gear. Wireless communication repeater comprising a rack gear. The method of claim 7, wherein The rack gear is mounted on the lower surface of the upper frame in an oblique direction with respect to the vertical plane, such that the upper frame on which at least one of the donor antenna and the service antenna is mounted moves in an oblique direction with respect to the vertical plane as the motor rotates. Wireless communication repeater, characterized in that. The method of claim 6, A horizontal panel on which at least one of the donor antenna and the service antenna is mounted; A fixed end on which the motor is mounted, The antenna movement mechanism includes a vertical bevel gear mounted to the motor, a horizontal bevel gear meshed with the vertical bevel gear to rotate the motor's rotational motion to a linear motion of the horizontal panel, and a horizontal bevel gear. And a pinion mounted on the other end of the shaft, and a rack gear mounted on one side of the upper frame and engaged with the pinion. The method of claim 9, The rack gear is mounted in a vertical direction on one side of the horizontal panel, so that the horizontal panel on which the donor antenna and the service antenna are mounted moves in a vertical direction according to the rotation of the motor making a vertical direction with a horizontal plane. Wireless repeater. The method of claim 6, A rotating panel to which at least one of the donor antenna and the service antenna is mounted; A fixed end on which the motor is mounted, The antenna moving mechanism includes a coupling hole formed in the rotating panel and connected to an inner circumferential surface and having a key groove formed therein, and a key protruding from the driving shaft end of the motor inserted into and coupled to the coupling hole. The method of claim 11, The planar shaft of the rotating panel is provided to be perpendicular to the rotating shaft of the motor, so that the rotating panel equipped with at least one of the donor antenna and the service antenna rotates in parallel with a horizontal plane according to the rotation of the motor. Wireless repeater. A donor antenna and a service antenna are provided to process a reverse RF signal received from a wireless communication terminal through a service antenna, and relayed to a base station through a donor antenna, and a reverse RF signal received from a wireless communication terminal through a service antenna is processed. In the wireless communication repeater relayed to the base station through the donor antenna, When the isolation between the donor antenna and the service antenna is changed, the isolation control method of the wireless communication repeater to ensure the isolation between the donor antenna and the service antenna by changing the position of at least one of the donor antenna and the service antenna. . A first step of processing a reverse RF signal received through a service antenna from a wireless communication terminal to detect a noise level for a reverse signal path relayed to a base station through a donor antenna; A second step of comparing the detected noise level with a preset level setting value and determining whether the noise level has increased above the level setting value; A third step of changing the position of at least one of the donor antenna and the service antenna when it is determined that the detected noise level is increased above a preset level setting value and the isolation is changed; By detecting the noise level and comparing it with the level set value, the position of at least one of the donor antenna and the service antenna is changed between the donor antenna and the service antenna until the noise level does not increase above the level set value. And a fourth step of ensuring a target stable isolation. The method of claim 14, And in the first step, detecting a noise level when no signal is detected for the reverse signal path. The method of claim 15, And the first step is configured to detect the noise level after forcibly increasing the gain of the signal by a gain determined to be able to raise the noise level and prevent oscillation, and to detect the noise level. The method of claim 16, In the second step, the preset level setting value, A thermal noise level indicating a noise power due to heat generated in a corresponding frequency band; Its own gain of the repeater; A signal level obtained by adding up a noise figure representing an output side signal-to-noise ratio (SNR) to an input side signal-to-noise ratio (SNR) of a device and a noise figure. The method of claim 17, A fifth step of determining after the fourth step whether the reverse signal level at the time of no signal from the reverse signal path is equal to or less than a preset setting value; When the reverse signal level is determined to be equal to or less than a preset value, entering a sleep mode by turning off an RF switch intermittent for relaying the reverse signal; And receiving a signal from a wireless communication terminal, turning on the RF switch to release a sleep mode and returning to a normal operation state. . The method of claim 18, In the sixth step, the preset value is a sum of the thermal noise level, the gain of the repeater, the noise figure, and a margin of a certain level. Isolation securing control method of a wireless communication repeater, characterized in that corresponding to. The method of claim 19, The sixth step may include: determining whether the backward noise level at the time of no signal has increased more than a specific level value immediately before entering a sleep mode; A sixth step of changing the position of at least one of the donor antenna and the service antenna to turn on the forward and reverse RF switches to reduce the increment above the specified level value if the reverse noise level is increased above the specific level value; Steps; And a step 6c of turning on a reverse RF switch to enter a sleep mode when the increase of the specific level value is reduced after changing the position of at least one of the donor antenna and the service antenna. Isolation control method of communication repeater. The method of claim 20, If it is determined that the signal is received from the wireless communication terminal after step 6b, the wireless communication repeater comprising the step of performing a wireless communication relay by restoring the position of the moving antenna to the original position before the movement How to control isolation.

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