KR101458355B1 - method to reduce uplink noise - Google Patents

Abstract

The present invention detects an uplink signal strength in a relay apparatus and controls a plurality of attenuators based on the detected signal strength to reduce uplink noise directed to a base station, and detects a strength of a detected signal and a attenuation amount To a user via the Internet.

Description

[0001] The present invention relates to a method for reducing uplink noise,

The present invention detects an uplink signal strength of a relay apparatus in a communication system and controls a plurality of attenuators based on the detected signal strength to reduce noise of an uplink directed to a base station, And information about attenuation amount through the Internet.

Mobile communication providers are actively reviewing the introduction and operation of relay apparatuses (hereinafter, relay apparatuses are all devices capable of relaying between terminals and base stations) from the initial network design stage. Actually, many mobile communication relay apparatuses are introduced, Service. In addition, mobile telecommunication operators not only in Korea but also around the world actively participate in the introduction and development of relay devices.

In the mobile communication service, the relay device is striving for securing coverage and fast mobile communication service unlike the early days used for shaded area disposal, and focuses on developing it. In addition, energy savings can be made to comply with Green IT policy, which is a global issue.

A conventional technique developed to meet such an environment is a sleep mode.

For example, Korean Patent Laid-Open No. 10-2004-0111111 (a mobile communication terminal using a sleep mode method and a sleep mode method) is available. This prior art (Korean Patent Laid-Open No. 10-2004-0111111)

In the sleep mode, when communication with the base station is performed in the normal mode, when there is no more traffic to be transmitted / received to the base station, the base station requests the base station to enter the sleep mode, and receives a response from the base station.

In the sleep mode, a listening interval, which is a period for monitoring a radio channel, and a sleep interval, which is a period in which a radio channel is not monitored, are alternately repeated.

The mobile communication terminal can not transmit and receive packet data in the sleep interval, and packet data arriving at the base station in the sleep interval is stored in the buffer. In this way, packet data between the terminal and the base station is transmitted. The arrival time between the terminal and the base station is called a packet arrival delay time.

A slip interval including information related to the sleep interval and the listening interval for operating in the sleep mode

And periodically sends a Sleep Request message to the base station. At this time, the sleep request message includes an initial sleep window, a final sleep window base, a final sleep window exponent, and listening window data.

 The value of the listening interval is a fixed value during the sleep mode, and the sleep interval has a value that is twice the previous sleep interval. Here, the delay time of the packet traffic is determined by the value of the final sleep window exponent.

Final Slip Window = Final Slip Window Bass × 2 (Final Sleep Windows Extension).

That is, the final sleep interval length is determined according to the value of the final sleep window exponent, and according to the length of the final sleep interval

The length of the sleep interval in the sleep mode is determined, and accordingly, the packet arrival delay time is determined.

In order to make a state transition from the sleep interval to the listening interval, a response message from the base station must exist, and a procedure for checking the response message of the base station is required. All of these packet arrival delay times proceed in the sleep interval state, and such an increase in time causes a problem that the state transition does not occur quickly at the required time.

In the mobile communication system, when an attempt is made to access an UL call, an access probe is first transmitted. If the access probe signal transmitted from the terminal is normally received by the base station, the base station transmits a response message to the terminal indicating that the access probe signal has been normally received. If the terminal normally receives a response from the BTS, . Access Probe signals are signals such as PRACH (Physical Random Access Channel) in WCDMA and LTE, RACH (Random Access Channel) in 2G GSM, Packet Random Access Channel (PRACH) in GRRS and EDGE.

In the sleep interval state, when the access probe transmission process proceeds, a message is immediately transmitted to the base station to transition to a listening interval. However, if an error occurs in this process, a fatal packet error such as a buffering problem at the base station side is generated, Loss may occur.

In a mobile communication network, a plurality of repeaters are connected to one base station, thereby increasing coverage at low cost. This has the advantage of being economical, but it has disadvantages of increasing noise according to the number of repeaters used. This increase in noise causes the signal-to-noise ratio of the base station receiver to deteriorate, thereby reducing the reception capacity and coverage of the base station.

) 으로 정의 된다. 여기서

은 중계장치 전체의 잡음 지수 이고, F1, F2, …은 중계 장치에 포함되어있는 각각의 소자의 잡음 지수 이다.
Here, the noise figure of the repeater

). here

Is the noise figure of the whole repeater, and F1, F2, ... Is the noise figure of each element included in the repeater.

의 값은 10.05dB이고, 동일한 조건에서 첫 번째 앰프의 이득(Gain)이 10dB, 세 번째 앰프의 이득(Gain)이 30dB일 때의

의 값은 13.36dB으로 3.31dB만큼 상승하였다.
For example, if any relay device contains three devices, the first device has a gain of 30 dB and the noise figure (NF) is an amplifier with 10 dB, and the gain of the second device is -3 dB Is a filter with a noise figure (NF) of 20dB, an amplifier with a third element of 10dB and a noise figure (NF) of 10dB

Is 10.05dB, and when the gain of the first amplifier is 10dB and the gain of the third amplifier is 30dB under the same conditions,

Was increased by 3.31dB to 13.36dB.

의 값은 변하게 되고, 이는 기지국으로 입력되는 잡음 값에 영향을 미치게 되다. 즉 중계 장치 전체의 이득(Gain)은 고정되어있는 상태에서 필터 앞의 이득(Gain)이 높아지고, 필터 뒤의 이득(Gain)은 작아지게 되면 기지국으로 입력되는 잡음의 값을 낮추게 되고, 이는 기지국의 신호 대 잡음 비를 좋아지게 하며 따라서 기지국의 수신감도 및 커버리지 증가의 효과를 볼 수 있다.
Therefore, depending on the gain before the filter and the gain after the filter,

Is changed, which affects the noise value input to the base station. That is, when the gain of the entire relay apparatus is fixed and the gain after the filter becomes low and the gain after the filter becomes small, the value of the noise inputted to the base station is lowered. Thereby improving the signal-to-noise ratio and thus the effect of increasing the reception sensitivity and coverage of the base station.

The noise input to the base station is the noise figure of the white noise + repeater + the gain of the repeater

Level. The white noise is defined as -174dBm in the decompression formula. In order to lower the noise value input to the base station while the gain and bandwidth (BW) are fixed, the noise figure of the repeater must be lowered.

Noise Floor: White Noise + BW + NF + Gain

Based on the following example, the noise floor is calculated as follows.

White Noise: -174dBm / Hz

BW: 10 MHz = 10 log 10 ^ 6 = 70

Gain: 90dB

NF: 5dB (-70dBm Input)

NF: 30dB (-30dBm)

Noise Floor = -174 (White Noise) +70 (BW) +90 (Gain) +5 (NF) = -9 dBm

Noise Floor = -174 (White Noise) +70 (BW) +90 (Gain) +30 (NF) = 16 dBm

) 로 정의 된다. 여기서

은 중계장치 전체의 잡음 지수 이고, F1, F2,…은 중계 장치에 포함되어있는 각각의 소자의 잡음 지수 이다.
Here, the noise figure of the repeater

). here

Is the noise figure of the whole repeater, and F1, F2, ... Is the noise figure of each element included in the repeater.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-described conventional problems, and it is an object of the present invention to provide a mobile communication system in which a relay apparatus (hereinafter referred to as relay apparatuses) And a method of reducing the power consumption of the base station by reducing the service coverage of the base station.

In addition, while the conventional sleep mode generates an error due to the state transition, the present invention is fundamentally controlled based on the input level, thereby eliminating a problem that may occur during the state transition process, And a method and apparatus for reducing the cost of a product.

In order to achieve the above object,

(Hereinafter, referred to as a Detector, a Logarithmic Detector, an RMS-responding power detector, an Envelope Detector, etc.) for measuring and verifying the input / output signal level of the relay apparatus (hereinafter, the relay apparatus can relay between the terminal and the base station) And includes a detec- tive structure using a Peak Detector, a Peak Hold Detector, and an Average Detector, and also includes a Detector type or a periodic structure described later) and a plurality of An attenuator, and a remote control unit (RCU) for signal detection and attenuator control.

The present invention relates to a method for controlling a plurality of attenuators through an RCU to reduce uplink noise of a base station and informing a user of information on the measured signal level and the attenuation amount of the attenuator through the Internet,

A comparison step of comparing a signal level detected in an uplink with a threshold level set in the uplink; a storing step of storing a current attenuator setting state of the relay apparatus; A control step of controlling a plurality of attenuators based on a result of the comparison determination step to reduce uplink noise; and a control step of, when a value higher than a threshold value, And a notification step of transmitting information on the level of the signal detected in the detection step and the amount of attenuation of the attenuator controlled in the control step to the user via the Internet.

In the detecting step, an uplink signal level input to the relay apparatus is detected. The detector which is detected at the detection step uses an input detector for detecting an input signal, a filtering detector for measuring the level of the signal of the pass band between the plurality of attenuators and an output detector for measuring the output level of the relay device, .

In addition, the Filtering Detector can be located behind any type of filtering device that can be filtered, or inside or outside a digital filter capable of digital signal processing.

The signal detected in the detection step includes an input signal input to the relay device, a filtering signal for measuring a signal in the passband, and an output signal output from the final stage of the relay device The above signals are detected.

In the comparison determination step, the level of the signal detected in the detecting step is compared with the threshold level that is set in advance, and the presence or absence of the uplink signal input to the relay apparatus is determined.

In the control step, when it is determined that there is no uplink signal based on the result determined in the comparison determination step, a plurality of attenuators (hereinafter referred to as FATT) and a plurality of attenuators The attenuation amount of a plurality of attenuators (backward ATTenuator, hereinafter referred to as BATT) is changed to reduce the noise of the signal toward the base station.

In the control stage, the operation of the attenuator controlled by the RCU increases the amount of attenuation of BATT by the attenuation amount of FATT and adjusts the amount of attenuation of FATT to the corresponding gain because it has to maintain the corresponding gain.

In the recovering step, if the level of the uplink signal is higher than the set threshold level while monitoring the signal strength of the uplink signal input through the detection process continuously after the control step, Restored to the attenuation amount.

In the recovery phase, the operation of the attenuator controlled by the RCU decreases the attenuation amount of the BATT to the stored value when the RCU stores the attenuation amount of the BATT prior to the control phase, Adjust the amount to the appropriate gain.

In the informing step, information on the uplink signal level detected in the detecting step and the attenuation amount of the attenuator controlled in the control step is transmitted to the Internet through the RCU included in the relay apparatus.

According to the present invention, a noise reduction method that is one step further improved by eliminating an error that may occur in a state transition process, which is a weak point of the sleep mode of the related art. This can reduce the power consumption of the base station.

The reception sensitivity of the base station is improved due to the decrease of the uplink noise from the relay apparatus to the base station, and thus the service coverage expansion of the base station can be effected.

Since all of this process is transmitted to the users via the RCU in the relay device, the user can check the input signal level, relay device status, and attenuator setting status through the Internet without directly monitoring in the field. Accordingly, the user can immediately solve the problem in the event of a problem, thereby enhancing the service quality of the mobile terminal subscriber.

1 is a block diagram illustrating an apparatus for reducing uplink noise according to the present invention;
2 is a block diagram illustrating an apparatus for reducing uplink noise according to an embodiment of the present invention.
3 is a block diagram illustrating a notification method via the Internet of the present invention.
4 is a flowchart illustrating a method for reducing uplink noise according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the technical idea of the present invention. . In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Further, the present invention can be implemented in various different ways and is not limited to the embodiments described herein.

(Example)

A relay apparatus for describing a method and an apparatus for reducing uplink noise (hereinafter, a relay apparatus is an apparatus for relaying between a terminal and a base station) will be described in detail as follows.

As shown in FIG. 1, an apparatus for controlling uplink noise by controlling a plurality of attenuators controls a plurality of attenuators, a plurality of detectors, a filter capable of filtering a desired band, a detector, and an attenuator, And a remote control unit (RCU) for transmitting information to the user.

The attenuator has at least one attenuator before the filterable filter, and there is at least one attenuator behind the filter.

The detector includes an Input Detector (hereinafter referred to as ID) for detecting an input signal, a Filtering Detector (hereinafter referred to as FD) for detecting a signal of the corresponding band after filtering the desired band, and an Output Detector , OD).

The filter includes all kinds of filtering devices which can filter the desired band such as RF-SAW filter, IF-SAW filter, DR-filter or DSP.

FIG. 2 is a block diagram showing a system configuration for controlling a plurality of attenuators according to an embodiment of the present invention. In order to describe a preferred embodiment, the attenuator is represented by one attenuator before and after the filter. It expresses. It should be noted that this embodiment can be implemented in a different manner from the embodiment as an embodiment.

3, the RCU includes a Web server 164, and the Web server 164 transmits information on the state information of the relay device stored in the DB (Data Base) 162 and the attenuation amount of the attenuator to the Internet 500 to the user PC 600 in the form of a Web page. That is, the user can check the state information of the relay device and the control information of the attenuator through the Web page of the user PC 600, and control the detailed items.

The user PC 600 includes a Web browser capable of displaying a Web page provided with status information of the relay device. At this time, the user PC 600 is configured as a device capable of data communication through the Internet, such as a personal computer, a notebook computer, and a personal portable terminal.

Hereinafter, a method and apparatus for reducing uplink noise according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a block diagram for explaining an uplink noise reduction method by controlling a plurality of attenuators according to an embodiment of the present invention, and FIG. 4 is a flowchart of a method for determining whether there is an uplink abnormality.

First, the RCU included in the relay device always monitors the strength of the uplink signal input to the relay device through the FD. At this time, the FD detects the signal intensity (hereinafter referred to as FL) in the pass band of the relay apparatus and detects the intensity of the signal input to the pass band.

The signal detected through the FD is compared with the set threshold level to determine the presence or absence of the uplink signal. In this case, the FL detected through the FD monitors the intensity of the signal in the passband being used. If FL is lower than the threshold, the attenuator is controlled. If the FL is higher than the threshold, the control proceeds to the control The detection process continues.

If the detected FL is lower than the set threshold level, the RCU judges that there is no uplink signal and controls the attenuator. In this case, the attenuator control controls the attenuator by reversing the attenuation amount of the attenuator (Backward ATTenuator, hereinafter referred to as BATT) behind the filter and the attenuator (hereinafter referred to as FATT) before the filter without changing the set gain. do. More specifically, the attenuation amount of the BATT is increased by the amount of attenuation of the FATT determined by the gain set currently in the relay apparatus, and the amount of attenuation of the FATT is decreased by the amount of attenuation to match the set gain. At this time, the amount of attenuation of BATT and FATT before the control stage to be used in the recovery process is stored in the RCU.

After controlling the FATT and BATT, FL is monitored by the second detection step. At this time, if the detected signal is detected to be higher than the set threshold, the RCU judges that there is an uplink signal, immediately decreases the attenuation amount of the BATT to the stored value, and adjusts the attenuation amount of the FATT according to the gain

Information on the amount of attenuation of the FATT and BATT controlled through the FL and RCU detected during the above routine is transmitted to the user PC through the WEB PAGE.

100: Uplink antenna 101 to 102: Attenuator (FATT)
103 to 104: Attenuator behind the filter (BATT) 201: Input Coupler
202: Output Coupler 203: Input Detector
204: Output Detector 205: Filtering Detector
500: Internet 501: RCU (Remote Control Unit)
502: DB (Database) 503: WEB SERVER
600: User PC

Claims (8)

An uplink noise reduction apparatus including an RCU for controlling a detector, a plurality of attenuators, a detector, and an attenuator for measuring and checking input and output levels in a relay apparatus and performing a signal comparison and comparison procedure comprises a plurality of attenuators And a method for informing the user of the information about the measured input / output level and the attenuation amount of the attenuator through the Internet,
A detecting step of detecting a level of an uplink signal input from the terminal to the relay apparatus;
A comparison determination step of comparing and determining the level of the uplink signal detected by the relay apparatus with the set threshold level,
A storing step of storing a current attenuator setting state of the relay apparatus;
A control step of controlling the plurality of attenuators in the RCU to reduce the uplink noise based on the result of the comparison determination step;
And a restoring step of restricting a plurality of attenuators to a state before being controlled in a control step when a value higher than a threshold value for which an uplink signal is set is input to the relay apparatus after the control step,
In the control step, if it is determined that there is no signal in the comparison determination step, the amount of attenuation of the plurality of attenuators behind the filter is increased by the attenuation amount of the attenuator located in front of the filter, Wherein the attenuator located in front includes a step of reducing the amount of attenuation to maintain a set gain,
The method of claim 1,
The Detector for detecting the level of a signal input to the relay apparatus includes an Input Detector for detecting an input signal, a Filtering Detector for measuring a level of a signal in a pass band between the plurality of attenuators, and an Output Detector for measuring an output level of the relay device And the uplink is monitored by using the above-mentioned detector. The uplink noise reduction method
The method according to claim 1,
And a comparison determining step of comparing the signal level detected in the detecting step with a set threshold level to determine the presence or absence of a signal.
The method of claim 1,
And the current attenuator setting state to be restored in the restoring step is stored before the control step.
delete delete The method of claim 1,
And a recovery step of restoring the attenuator to a set state stored in the storing step when the uplink signal is inputted higher than the set threshold level while the detection process is continuously performed after the control step. delete

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