KR102069545B1 - Mobile communication repeater mounted on movable means - Google Patents

Abstract

The present invention relates to a mobile communication relay device, and more particularly to a mobile communication relay device mounted on a mobile means. The relay apparatus according to an aspect of the present invention is mounted on a moving means, converts an analog input signal received from a base station into a digital input signal, filters the digital input signal, and converts the filtered digital input signal into an analog signal and outputs the result. The signal processor may include a signal processor configured to measure the power level of the digital input signal, and a controller configured to control the filter coefficient using the power level. According to the present invention, since the signal processing time may be adjusted according to the strength of the received signal, the signal quality may not be deteriorated even when the terminal receives the signal repeatedly.

Description

MOBILE COMMUNICATION REPEATER MOUNTED ON MOVABLE MEANS}

The present invention relates to a mobile communication relay device, and more particularly to a mobile communication relay device mounted on a mobile means.

Base stations are installed on the coasts or islands to provide mobile communication services even at sea. The base station transmits a signal of a constant output toward the sea, the terminal located on the ship of the coast can receive the signal and provide a communication service to the user. However, the terminal located in the ship can not transmit a signal of high power, which causes the base station to receive a signal of the terminal, causing frequent communication loss. In addition, if the distance between the base station and the ship is far away, the terminal located in the ship will not be able to process the signal of the base station. This is because the signal sensitivity from the base station is inferior.

 Accordingly, a number of ships equipped with mobile communication relay devices (hereinafter referred to as "relay devices") are increasing. The relay apparatus installed in the ship may receive the base station signal transmitted from the base station through the link antenna and then amplify and transmit the signal to the terminal located in the ship through the service antenna. In addition, the relay device may receive the signal transmitted from the terminal through the service antenna, amplify and transmit the signal to the base station through the link antenna. That is, the relay device may relay communication between the base station and the terminal.

As the ship moves, the strength of the signal received by the ship's relay continues to fluctuate. If the ship's relay device is located in the weak field does not cause a big problem, if the ship is located in a strong field may cause problems such as call drop. This is because the ship's terminal can directly receive and process the signal of the base station when the ship's relay device is located in the strong electric field.

That is, the signal transmitted from the base station can be received by the terminal and the relay device, respectively, and the relay device amplifies the signal and sends it again. Accordingly, the terminal receives the signal already received through the base station through the relay device again, which may cause a deterioration in quality of service. In particular, the longer the signal processing time in the relay device, the higher the possibility of quality degradation of an OFDM signal such as an LTE signal.

In order to solve the above problems, the present invention is to provide a mobile communication relay apparatus that can adjust the signal processing time according to the strength of the received signal.

According to an aspect of the present invention, in a mobile communication relay apparatus mounted on a mobile means for relaying a mobile communication signal between a terminal and a base station, converting an analog input signal received from the base station into a digital input signal, the digital input A signal processor for filtering a signal and converting the filtered digital input signal into an analog signal and outputting the analog signal; A signal measuring unit measuring a power level of the digital input signal; And a control unit for controlling the filtering processing time using the power level.

In example embodiments, the signal measuring unit may measure the intensity of a reference signal of the digital input signal at the power level.

The signal processor may include a digital filter for filtering the digital input signal, and the controller may control the number of the digital filter taps using the power level.

According to an embodiment, the control unit controls the number of taps of the digital filter to be m when the power level is the p-level, and to control the number of taps of the digital filter to be mn when the power level is the p-1 level. Wherein p and m are two or more natural numbers, n is a natural number less than m, the power level of the p-th level may be less than the power level of the p-1 level.

The signal processor may include a digital filter for filtering the digital input signal, and the controller may control a filter coefficient of the digital filter using the power level.

According to an embodiment, the controller may read out filter coefficient information corresponding to the power level from digital filter information prestored in the provided storage space, and control the filter coefficient by using the filter coefficient information.

Since the mobile communication relay device according to the embodiment of the present invention can adjust the signal processing time according to the strength of the received signal, the signal quality may not be deteriorated even when the terminal receives the signal repeatedly.

1 is a block diagram of a mobile communication system according to an embodiment of the present invention.
2 is a block diagram of a mobile communication relay device according to an embodiment of the present invention.
3 is a block diagram of a signal processing unit of a mobile communication relay apparatus according to an embodiment of the present invention.
Figure 4 is a block diagram of a digital filter of a mobile communication relay device according to an embodiment of the present invention.
5 is a diagram illustrating digital filter information according to an embodiment of the present invention.
6 is a flowchart illustrating a signal processing time adjusting method of a mobile communication relay device according to an embodiment of the present disclosure.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

An interference cancellation relay device according to an embodiment of the inventive concept may support mobile communication services used worldwide. For example, the interference elimination relay device may include a frequency such as Very High Frequency (VHF), Ultra-High Frequency (UHF), 700 MHz, 800 MHz, 850 MHz, 900 MHz, 1900 MHz, 2100 MHz band, and 2600 MHz band. Can support services In addition, the interference elimination relay device may include a typical analog mobile communication service (AMPS), a digital time-division multiplexing access (TDMA), a code division multiple access (CDMA), Asynchronous CDMA (Wideband Code Division Multiple Access, WCDMA), High Speed Downlink Packet Access (HSDPA), Long Term Evolution (LTE), Long Term Evolution Advanced (LTE-A), etc. It can support multiple mobile communication services.

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

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

Referring to FIG. 1, a mobile communication system according to an embodiment of the present invention may include a base station 110, a relay device 120, and a terminal 140.

The base station 110, the relay device 120, and the terminal 140 may be connected through the mobile communication network 150 to transmit and receive signals with each other. That is, the signal transmitted from the terminal 140 may be amplified by the relay device 120 and then transmitted to the receiving side (eg, the receiver terminal (not shown)) via the base station 110. In addition, a signal transmitted from a transmitting side (eg, a transmitter terminal (not shown)) may be amplified by the relay device 120 via the base station 110 and then transmitted to the terminal 140. When the distance between the base station 110 and the terminal 140 is difficult to smooth signal transmission, the relay device 120 may act as a signal amplification between the base station 100 and the mobile communication terminal 300.

The mobile communication network 150 may process call and call from each base station 110 through connection with each base station controller (BSC). In addition, the mobile communication network 150 may be operated by a mobile communication exchange (not shown), the mobile communication exchange (not shown) is a central control function and / or public to ensure that all base stations 110 can be efficiently operated A connection function with another network such as a public switched telecommunication network (PSTN) may be performed.

The signal transmitted and received by each of the base station 120, the relay device 120, and the terminal 140 may be a Long Term Evolution (LTE) signal, but the scope of the present invention is not limited by the type of the signal.

The relay device 120 may be mounted on a moving means 130 such as a ship, and the position thereof may be changed. This may cause a problem such as a call drop, and this problem may be increased as the time for the signal processing in the relay device 120 increases. Therefore, the relay device 120 according to an embodiment of the present invention can overcome the above problem by adjusting the signal processing time according to the distance from the base station 110. Hereinafter, the operation of the relay apparatus 120 according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 to 6.

2 is a block diagram of a mobile communication relay device according to an embodiment of the present invention.

In the present specification, for convenience of description, the relay device 120 will be described based on signal processing of the downlink path. Since the signal processing of the uplink path in the relay device 120 may correspond to the signal processing of the downlink path, a detailed description thereof will be omitted.

Referring to FIG. 2, the relay device 120 according to an embodiment of the present invention may include a receiver 210, a signal processor 220, a signal measurer 230, a controller 240, and a transmitter 250. Can be. The receiver 210 may receive an analog input signal from the base station 110 through a link antenna. In addition, the receiver 210 may remove noise included in the received analog input signal. Therefore, the receiver 210 may include a low noise amplifier (LNA). In addition, the receiver 210 may attenuate the analog input signal from which the noise is removed. Therefore, the receiver 210 may include an attenuator.

The signal processor 220 may convert the analog input signal input from the receiver 210 into a digital input signal. In addition, the signal processor 220 may filter the digital input signal. In addition, the signal processor 220 may convert the filtered digital input signal into an analog signal. In addition, the signal processor 220 may amplify and output the converted analog signal.

The transmitter 250 may transmit the amplified signal to the outside through the service antenna.

The signal measuring unit 230 may measure the power level of the digital input signal. Here, the power level may correspond to the real-time power value of the digital input signal. In addition, the power level may correspond to the maximum value or the average value of the power level of the digital input signal input to the signal measuring unit 230 for a predetermined time. In addition, the power level may correspond to a power value of a reference signal included in the digital input signal. That is, the power level may be applied regardless of the kind as long as the power level of the digital input signal can be estimated. Therefore, the definition of the power level cannot limit the scope of the present invention. Hereinafter, for convenience of understanding and description, it is assumed that the power level corresponds to the power value of the reference signal included in the digital input signal.

The controller 240 may control the input signal processing time of the signal processor 220 using the power level measured by the signal measurer 230.

Hereinafter, operations of the signal processor 220, the signal measurer 230, and the controller 240 according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

3 is a block diagram of a signal processing unit of a mobile communication relay according to an embodiment of the present invention, and FIG. 4 is a digital diagram of a mobile communication relay device according to an embodiment of the present invention. Block diagram for the filter.

Referring to FIG. 3, the signal processor 220 according to an embodiment of the present invention includes an analog to digital converter (ADC) 310, a digital filter 320, and a digital to analog converter (DAC) 330. .

The ADC 310 may convert an analog input signal into a digital input signal.

The digital filter 320 may filter the digital input signal. The digital filter 320 may be designed to have a specific pass band through a plurality of taps and filter coefficients corresponding to preset taps. Referring to FIG. 4, a digital filter 320 including M tabs is illustrated (wherein M is a natural number of two or more). In addition, corresponding tap coefficients b1 to bM (where b1 to bM are real numbers) may be set in each tap included in the digital filter 320.

Meanwhile, the signal measuring unit 230 may receive the digital input signal (or a part thereof) output from the ADC 310 and measure the power level of the digital input signal. Since the signal measuring unit 230 may measure various power levels, detailed description thereof will be omitted. In addition, the signal measuring unit 230 may output the measured power level to the control unit 240.

The controller 240 may control the number of taps and / or filter coefficients of the digital filter 320 using the input power level. As the number of taps of the digital filter 320 increases, the amount of computation processed by the digital filter 320 increases, so that the delay time of the relay device 120 (that is, the time of processing the input signal in the relay device 120) is increased. Will increase. Therefore, the control unit 240 analyzes the power level to determine whether the relay device 120 is located in the strong electric field or the weak electric field, and in order to reduce the delay time when the relay device 120 is located in the strong electric field of the digital filter 320. You can control the number of taps to be reduced.

On the other hand, when the relay device 120 is located in the weak electric field, the controller 240 may control the number of taps of the digital filter 320 to increase so as to properly perform the function of the relay device 120.

In addition, the controller 240 may change the filter coefficient corresponding to the changed number of taps so that the characteristics of the digital filter 320 do not vary greatly as the number of taps of the digital filter 320 changes. Hereinafter, an operation of controlling the number of taps and / or filter coefficients of the digital filter 320 by the controller 240 will be described in more detail with reference to FIG. 5.

5 is a diagram illustrating digital filter information according to an embodiment of the present invention.

Referring to FIG. 5, digital filter information according to an embodiment of the present invention is illustrated. The digital filter information may be pre-stored in a storage space (not shown) provided in the controller 240 or pre-stored in a storage space (not shown) connected to the control unit 240.

The digital filter information may be matched with information on the filter coefficient of each tap corresponding to each power level. Therefore, the digital filter information may be information in the form of a look-up table.

Referring to FIG. 5, power levels may be divided into p levels (where p is a natural number of 2 or more). In addition, each power level may be set to a range value, not an arbitrary value. For example, the first level may be set to a power level of 2 [mV] or more, and the second level may be set to less than 2 [mV] and 1.5 [mV] or more.

In addition, the filter coefficient corresponding to each power level may be stored in the digital filter information in advance. For example, if the power level is the first level, the filter coefficients corresponding to b0 may be matched to b01, the filter coefficients corresponding to b1 may be matched to b11, and the taps corresponding to b2 to bM are matched to be inactive. It may be.

In addition, when the power level is the p-th level, the filter coefficient corresponding to b0 may be matched to bp1, the filter coefficient corresponding to b1 may be matched to bp1, and the filter coefficient corresponding to b2 is b2p and corresponds to bM. The filter coefficients may be matched to bMp.

Here, each filter coefficient matched with the digital filter information may be a real number.

FIG. 5 illustrates a case where the power level corresponding to the first level is the largest and the power level corresponding to the p-level is the smallest. When the power level corresponds to the first level, a delay time may be reduced by reducing the number of filter taps included in the digital filter 320 so that problems such as call drop may not occur. On the other hand, if the power level corresponds to the p-th level, the number of filter taps included in the digital filter 320 should be increased so that the terminal 140 can receive the base station 110 signal smoothly.

Accordingly, the controller 240 may determine which level of the p power levels divided by the digital filter information is measured by the signal measuring unit 230, and then read the filter coefficient information corresponding to the determined level. . In addition, the controller 240 may control the number of taps and / or filter coefficients of the digital filter 320 using the read filter coefficient information. In the example of FIG. 5, the controller 240 may deactivate the tap corresponding to the filter coefficient to OFF and change the filter coefficient corresponding to the tap not corresponding to the filter coefficient information read out to the digital filter information.

That is, in the example of FIG. 5, if the power level is determined to be the p level, the control unit 240 changes the filter coefficient corresponding to b0 to b0p, the filter coefficient corresponding to b1 to b1p, and corresponds to bM. The filter coefficient can be changed to bMp. Since the pth level is the lowest power level, it activates all the taps included.

In addition, when the power level is the p-1 level, the controller 240 may control the number of taps of the digital filter 320 to be m-n (where n is a natural number). The controller 240 may change the filter coefficient corresponding to b0 to b0 (p-1) and the filter coefficient corresponding to b1 to b1 (p-1), but may deactivate some preset taps.

As described above, the relay device 120 according to the embodiment of the present invention may adjust the delay time by changing the number of taps and / or filter coefficients of the digital filter 320 according to the received signal strength, The signal quality may not be degraded even when the terminal receives duplicate signals.

6 is a flowchart illustrating a signal processing time adjusting method of a mobile communication relay device according to an embodiment of the present disclosure.

Hereinafter, referring to FIG. 6, the method of adjusting the time for which the relay device 120 processes the input signal is once again summarized. Each step to be described below may be a step performed by each component of the relay device 120, but will be collectively described as being performed by the relay device 120 for convenience of understanding and description.

In operation S610, the relay device 120 may measure the power level of the digital input signal received from the base station 110. The power level may correspond to the power value of the reference signal included in the digital input signal. However, the power level may be applied irrespective of its type as long as it can measure the size of the input signal.

In operation S620, the relay device 120 may read out the number of taps and / or filter coefficient information corresponding to the power level measured from the digital filter information pre-stored in the provided storage space (not shown). Here, the filter coefficient information may be information on a plurality of filter coefficients (information on each filter coefficient matched with digital filter information) corresponding to each power level, as illustrated in FIG. 5.

In operation S630, the relay device 120 may change the setting of the digital filter 320 by using the number of read taps and / or filter coefficient information. That is, when the relay device 120 is positioned in the strong electric field, the amount of calculation can be reduced by reducing the number of taps of the digital filter 320. As a result, the delay time in the relay device 120 may be reduced, thereby eliminating problems such as call drop. In addition, the relay device 120 may increase the number of taps of the digital filter 320 when the relay device 120 is located in the weak electric field so that the terminal 120 may receive the signal of the base station 110 smoothly.

In this case, even if the number of taps of the digital filter 320 is changed, the relay device 120 may also change the filter coefficient so that the characteristics of the digital filter 320 are not significantly changed.

As described above, the relay device 120 according to the embodiment of the present invention may adjust the delay time by changing the number of taps and / or filter coefficients of the digital filter 320 according to the received signal strength, The signal quality may not be degraded even when the terminal receives duplicate signals.

In addition, while the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below. It will be appreciated that various modifications and changes can be made.

110: base station
120: mobile communication relay device
130: means of transportation
140: terminal
150: network

Claims (6)

delete delete delete A mobile communication relay device mounted on a mobile means for relaying a mobile communication signal between a terminal and a base station,
A signal processor converting the analog input signal received from the base station into a digital input signal, filtering the digital input signal, and converting the filtered digital input signal into an analog signal and outputting the analog signal;
A signal measuring unit measuring a power level of the digital input signal; And
A control unit controlling a filtering processing time using the power level;
Including but not limited to:
The signal processor includes a digital filter for filtering the digital input signal,
The control unit,
If the power level is the p-th level to control the number of taps of the digital filter to be m, and if the power level of the p-1 level is controlled to be mn taps of the digital filter,
P and m are two or more natural numbers, n is a natural number less than m,
And the power level of the p-th level is smaller than the power level of the p-th level.
delete delete

Images