KR20080087610A - Asymmetry type line repeater using dual bands - Google Patents

Abstract

A dual-band asymmetric trunk repeater is provided to guarantee satisfactory communication quality at a service shadow area at a small outlay by amplifying and outputting signals of only a desired frequency band among received frequency band signals. A dual-band asymmetric trunk repeater(100) comprises a signal splitting part, a bypass part, an amplification part, and a signal coupling part. The signal splitting part receives a plurality of mobile communication signals having their respective characteristics and splits them according to certain criteria. The bypass part bypasses at least one among the mobile communication signals split from the signal splitting part. The amplification part amplifies at least one among the mobile communication signals split from the signal splitting part. The signal coupling part combines a mobile communication signal outputted from the bypass part with a mobile communication signal amplified at the amplification part and outputs the combined signal.

Description

Dual band asymmetric trunk intermediary {ASYMMETRY TYPE LINE REPEATER USING DUAL BANDS}

1 is a control block diagram of a conventional mobile communication relay system,

2 is a control block diagram of a mobile communication relay system to which the dual-band asymmetric trunk intermediary apparatus of the present invention is applied;

3 is a control block diagram of a dual band asymmetric trunk intermediary device according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

21: low frequency repeater 23: high frequency repeater

25: duplexer 27: splitter

31: transmission line 100: dual band asymmetric trunk intermediary device

110: first triplexer 112: first low frequency BPF

114: first uplink high frequency BPF 116: first downlink high frequency BPF

120: second triplexer 122: second low frequency BPF

124: second upward high frequency BPF 126: second downward high frequency BPF

130: bypass unit 140: upward amplification unit

142: LNA 144: upward BPF

146: upward attenuator 148: upward drive amplifier

150: down amplifier 152: down amplifier

154: downward BPF 156: downward attenuator

158: downward drive amplifier 160: gain control device

The present invention relates to a dual-band asymmetric trunk intermediary device, in particular, by amplifying only one desired frequency band signal of the received frequency band signal, low-cost communication in a service shadow area such as indoor (In-Building) The present invention relates to a dual band asymmetric trunk intermediary device that can guarantee quality and can be miniaturized.

The repeater is a device used to expand the mobile communication service coverage. The repeater receives the mobile communication signal from the base station, amplifies it to an appropriate level, and transmits it to the shadow area through the end service antenna to improve the call quality. Thus, repeaters are installed in areas where mobile communication signals are shielded, such as subways, underground parking lots, underground malls, and buildings.

Meanwhile, with the development of mobile communication technology, mobile communication services using signals of various communication methods have been provided. Currently, CDMA2000-1x evolution-data optimized (CDMA2000-1xEV-DO), CDMA2000-1x evolution-data and voice (CDMA2000-1xEV-DV), wideband-CDMA (W-CDMA), IMT-2000, etc., satellite DMB ( Various communication services such as digital multimedia broadcasting) and wireless internet are provided through the corresponding frequency band. These communication methods can be broadly divided into 2G (2nd generation) CDMA communication method and 3G (3rd generation) CDMA communication method. In the case of 2G CDMA, it is usually serviced through a frequency band around 800MHz ~ 900MHz, and in the case of 3G CDMA It is often serviced over a higher frequency band of 2,000MHz. Accordingly, mobile communication services are currently provided through different frequency bands, and accordingly, repeaters for processing different signal bands are mixed.

1 is a control configuration diagram of a conventional mobile communication relay system, illustrating an example in which mobile communication signals of different frequency bands are relayed using an eight divider 7 and a four divider 9 in an eight-story building. will be.

As shown in FIG. 1, a conventional mobile communication relay system includes a low frequency band repeater 1 for amplifying and outputting a mobile communication signal having a relatively low frequency band, and a high frequency for amplifying and outputting a mobile communication signal having a relatively high frequency band. A band repeater 3, a duplexer 5 for synthesizing a high frequency signal and a low frequency signal output from each repeater 1 and 3 into a single signal and outputting the signal to a transmission line, and eight signals inputted through the transmission line An eight divider (7) for distributing and outputting the transmission lines, a four divider (9) for distributing and outputting each signal to four transmission lines again interposed on each output line of the eight divider (7), and the distributed signal It includes a termination antenna 11 for wireless transmission in the shaded area.

The low frequency band repeater 1 receives a CDMA signal or a PCS signal using a relatively low frequency band from the base station and amplifies and outputs it.

The high frequency band repeater 3 receives a WCDMA signal, a DMB signal, or the like using a relatively high frequency band from a corresponding base station and amplifies and outputs the same.

The duplexer 5 combines the high frequency mobile communication signal and the low frequency mobile communication signal output from the repeaters 1 and 3 into one signal and outputs the signal to the transmission line.

An eight divider 7 is interposed in the transmission line to distribute the mobile communication signal to eight output lines so that the mobile communication signal is transmitted to each floor of an eight-story building, and a four divider 9 is provided on each floor. Each of the terminal antennas transmits a mobile communication signal mixed with a high frequency signal and a low frequency signal.

As described above, in the conventional mobile communication relay system, the low frequency mobile communication signal and the high frequency mobile communication signal output from the repeaters 1 and 3 are transmitted to the terminal antenna of each layer through the same transmission line.

However, as the length of the transmission line is extended, the signal attenuation rate increases in proportion to the frequency magnitude, so that the loss in the transmission line is relatively high in the case of a high frequency signal. Therefore, when two or more mobile communication signals having different frequency bands are transmitted to the same output using the same transmission line, there is a problem in that the output of the high frequency mobile communication signal from the terminating antenna is degraded.

In order to solve this problem, conventionally, a method of increasing the transmission output of a mobile communication repeater using a high frequency band has been proposed, but the deviation of the output of the region close to and far from the transmission line is large, and the transmission output Raising the limit is enough to solve the signal loss caused by the transmission line extension.

Therefore, there is also a method of separately installing a transmission line of a larger diameter in order to prevent signal loss, in this case there is a problem that the installation cost greatly increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can provide a high quality communication quality in a service shadow area such as indoor (In-Building) at low cost, and provides a dual-band asymmetric trunk intermediary device capable of miniaturization design. The purpose is to provide.

A dual-band asymmetric trunk intermediary device according to the present invention for achieving the above object comprises: a signal separation unit for receiving a plurality of mobile communication signals having different characteristics and separating each signal according to a predetermined criterion; A bypass unit for bypassing the signal separated by the signal separation unit; An amplifier for amplifying the signal separated by the signal separator; And a signal combiner configured to combine and output a predetermined mobile communication signal inputted from the bypass unit and a mobile communication signal amplified by the amplifier.

The signal separation unit may include: a low frequency bandpass filter for extracting a low frequency mobile communication signal having a relatively low frequency band from the mobile communication signal; An uplink high frequency bandpass filter for extracting an uplink high frequency mobile communication signal from a high frequency mobile communication signal having a relatively high frequency band among the mobile communication signals; It is possible to include a downlink high frequency bandpass filter for extracting a downlink high frequency mobile communication signal from the high frequency mobile communication signal.

The bypass unit may bypass the low frequency mobile communication signal extracted by the low frequency bandpass filter to the signal combiner.

The amplifying unit may further include: an up-amp which amplifies the uplink high-frequency mobile communication signal extracted by the uplink high-frequency bandpass filter according to a preset amplification factor; The downlink high frequency bandpass filter may include a downlink amplifier to amplify the downlink high frequency mobile communication signal according to a preset amplification factor.

The amplifying unit may further include an up attenuator for attenuating a signal level of the uplink high frequency mobile communication signal; A down attenuator for attenuating a signal level of the downlink high frequency mobile communication signal; It is possible to include a gain adjusting device for setting the gain of the up-down attenuator and the down- attenuator according to the user's selection.

The signal combiner includes: a second low frequency bandpass filter for filtering the low frequency mobile communication signal input from the bypass unit, and a second uplink high frequency bandpass filter for filtering the uplink high frequency mobile communication signal input from the upstream amplifier; And a second downlink high frequency bandpass filter for filtering the downlink high frequency mobile communication signal input from the downlink amplifier; The second low frequency bandpass filter and the amplified high frequency mobile communication signal output from at least one of the up-amp and the down-amp may be combined and output to the transmission line of the mobile communication signal.

On the other hand, the dual-band asymmetric trunk intermediary device according to the present invention for achieving the above object is a low-frequency mobile communication signal of a relatively low frequency band and a relatively high frequency of the mobile communication signal supplied through the transmission line of the mobile communication signal, A first triplexer for separating a high frequency mobile communication signal in a frequency band and a downlink high frequency mobile communication signal in a relatively high frequency band; A bypass unit for bypassing the low frequency mobile communication signal; An up amplifying unit for amplifying the uplink high frequency mobile communication signal; A downlink amplifying unit configured to amplify the downlink high frequency mobile communication signal; A second second combining the low frequency mobile communication signal input from the bypass unit and the amplified high frequency mobile communication signal output from at least one of the up amplifying unit and the down amplifying unit and outputting the combined high frequency mobile communication signal to a transmission line of the mobile communication signal; It is also possible to include a triplexer.

Hereinafter, a dual band asymmetric trunk intermediary device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

2 is a control configuration diagram of a mobile communication relay system to which the dual-band asymmetric trunk mediation apparatus 100 of the present invention is applied, so that the mobile communication signal is transmitted to each area of the indoor (In-Building) using the distributor 27. The case is illustrated.

As shown in FIG. 2, the mobile communication relay system to which the dual band asymmetric trunk mediation apparatus 100 of the present invention is applied includes a low frequency band repeater 21 for amplifying and outputting a mobile communication signal having a relatively low frequency band, The high frequency band repeater 23 for amplifying and outputting a high frequency band mobile communication signal and the high frequency mobile communication signal and the low frequency mobile communication signal output from each repeater 21 and 23 are combined into one signal and output to a transmission line. A duplexer (25), a splitter (27) for distributing and outputting a signal input through a transmission line, and a terminating antenna for transmitting a mobile communication signal, and each transmission line (31) of the splitter (27) is movable. A dual band asymmetric trunk intermediary device 100 for selectively amplifying a high frequency signal among the communication signals and transmitting the low frequency signal to the terminal antenna is installed.

The low frequency band repeater 21 receives a CDMA signal using a relatively low frequency band or a mobile communication signal for a 2G (second generation) service such as a PCS signal from the base station and amplifies and outputs it. The low frequency repeater 21 may process and output a low frequency mobile communication signal in a 800 to 900 MHz band.

The high frequency band repeater 23 amplifies and outputs a mobile communication signal for a 3G (3G) service such as W-CDMA and IMT-200 using a relatively high frequency band. The high frequency band repeater 23 may process and output a high frequency mobile communication signal in a 1,900 to 2,200 MHz band.

The duplexer 25 combines and outputs a high frequency mobile communication signal and a low frequency mobile communication signal output from each repeater 21 and 23 into one signal.

The distributor 27 divides the signal output from the duplexer 25 and outputs the signal to the transmission line 31.

The dual band asymmetric trunk intermediary device 100 interposed on the transmission line 31 receives a mobile communication signal combined with a high frequency mobile communication signal and a low frequency mobile communication signal, and selectively amplifies only the high frequency mobile communication signal to low frequency mobile communication signal. And transmit the amplified high frequency mobile communication signal to the terminal antenna. Meanwhile, in the above description, the dual band asymmetric trunk intermediary device 100 is installed in the transmission line 31 connected from the distributor 27 to the termination antenna, but the transmission line between the duplexer 25 and the distributor 27 is illustrated. The high frequency mobile communication signal and the low frequency mobile communication signal, such as a transmission line between the distributors or the distributors, can be installed anywhere.

The configuration of the dual band asymmetric trunk intermediary device 100 is as shown in FIG.

As shown in FIG. 3, the dual band asymmetric trunk intermediary device 100 according to the present invention separates or combines a mobile communication signal transmitted and received through a transmission line 31 into a low frequency signal, an uplink high frequency signal, and a downlink high frequency signal. A first triplexer 110 and a second triplexer 120, an up-amplifying unit 140 for amplifying an uplink high frequency signal separated from the first triplexer 110, and a second triplexer 120. It includes a down amplification unit 150 for amplifying the downlink high frequency signal separated from.

The first triplexer 110 includes a first low frequency BPF 112 that is a band pass filter (hereinafter referred to as a BPF) for passing a low frequency signal, and a first upward high frequency BPF 114 for passing an uplink high frequency signal. And a first downlink high frequency BPF 116 for passing downlink high frequency signals. The second triplexer 120 also has a structure corresponding thereto, and includes a second low frequency BPF 122, a second upward high frequency BPF 124, and a second downward high frequency BPF 126.

Among the mobile communication signals on the transmission line, the uplink / downlink low frequency signal is bypassed without amplification because the signal loss on the transmission line is not large. Accordingly, the uplink low frequency signal output from the first low frequency BPF 112 of the first triplexer 110 is input to the second low frequency BPF 122 of the second triplexer 120 through the bypass unit 130. Combined with the high frequency signal. In addition, the downward low frequency signal output from the second low frequency BPF 122 of the second triplexer 120 is input to the first low frequency BPF 112 of the first triplexer 110 through the bypass unit 130. Combined with the amplified high frequency signal.

Among the mobile communication signals on the transmission line, the uplink high frequency signal is separated from other signals in the first uplink high frequency BPF 114 of the first triplexer 110. The up-amplifier 140 interposed on the output line of the first uplink high frequency BPF 114 includes a low noise amplifier 142 for amplifying the uplink high frequency signal and an uplink BPF (LNA). 144, an attenuator 146, and an upward drive amplifier 148. Accordingly, the uplink high frequency signal is noise removed from the LNA 142, and only a signal corresponding to the required frequency is separated through the uplink BPF 144, and then the output is appropriately adjusted through the attenuator 146 so that the uplink drive amplifier 148. ) Is entered. The uplink drive amplifier 148 multiplies an uplink high frequency signal according to a predetermined gain and transmits the uplink high frequency signal to the second uplink high frequency BPF 124 of the second triplexer 120. Accordingly, the amplified uplink high frequency signal is combined with other signals in the second triplexer 120 and then output to the termination antenna or another transmission line.

Among the mobile communication signals on the transmission line, the downlink high frequency signal is separated from other signals in the second downlink high frequency BPF 126 of the second triplexer 120. The downlink amplifier 150 interposed on the output line of the second downlink high frequency BPF 126 includes a downdrive amplifier 158, a downlink attenuator 156, and a downlink BPF 154 for amplifying the downlink high frequency signal. And amplifier 152. Accordingly, the downlink high frequency signal is multi-stage amplified by the downlink drive amplifier 158, and then the output is adjusted by the downlink attenuator 156, and only the necessary frequency is separated through the downlink BPF 154, and then amplified by the amplifier 152. The amplified downlink high frequency signal is input to the first downlink high frequency BPF 116 of the first triplexer 110 and combined with other signals, and then output to a terminating antenna or another transmission line.

Here, the up and down attenuators 146 and 156 are used to adjust the signal level appropriately because the operation of the device is excessive when the output of the high frequency signal is too high. The attenuators 146 and 156 may include a gain adjusting device 160 to adjust the attenuation rate from the outside. The gain adjusting device 160 is provided with a predetermined button for selecting a user, so that the user can configure the gain of the attenuators 146 and 156 to be added or decreased at predetermined intervals, for example, at an interval of 1 dB.

With this configuration, the mobile communication signals transmitted and received through the transmission line 31 are separated into low frequency signals and up / down high frequency signals by triplexers 110 and 112 provided at both ends of the dual band asymmetric trunk intermediary device 100. The uplink / downlink high frequency signals of the separated signals are amplified to compensate for signal loss in the transmission line.

When the dual band asymmetric trunk intermediary device 100 according to the present invention having such a configuration is applied and not applied, the difference between reception levels is measured through experiments.

The experimental conditions and the experimental results are summarized as follows.

 Detailed setting Low frequency High frequency Output setting Repeater output 27dBm 10FA 17dBm / FA, fc = 859MHz 27dBm 4FA 21dBm / FA, fc = 2,045MHz Loss setting Duplexer 1 dB 3 splitter 9 dB Quadrant 6 dB Cable (1/2 '' [inch], 200m) 21 dB @ 859 MHz 36 dB @ 2,045 MHz Free space loss (antenna-terminal distance 30m) 61 dB About 69 dB Experiment result  Terminal Receive Level [RSSI] -81dBm -100dBm

The test condition is a mobile communication relay system (see FIG. 1) using an 8-divider and a 4-divider, and is wired to a length of 200 m using a generally used 1/2 '[inch] transmission line. Here, the low frequency band signal is set to 824 ~ 894MHz [fc = 859MHz] and the high frequency band signal is set to 1,920 ~ 2,170MHz [fc = 2,045MHz], and the attenuation of the transmission line is selected by the center frequency of 859MHz and Based on 2,045 MHz.

In addition, the outputs of the repeaters (1, 3, see FIG. 1) are all set to 0.5 W [27 dBm], the number of channels used in the low frequency band [FA] is set to 10 FA, and the number of channels used in the high frequency band [FA]. Is set to 4FA.

Under the above conditions, when the mobile communication signal is relayed according to the conventional method without using the dual band asymmetric trunk intermediary device 100, the reception level [RSSI] of the mobile communication terminal is -81 dBm, and the high frequency is low. The mobile communication signal was measured at -100dBm, and it was confirmed that the reception level of the high frequency mobile communication signal was reduced to 1/8 level compared to the low frequency mobile communication signal.

On the other hand, under the above conditions, if the dual-band asymmetric trunk intermediary device 100 according to the present invention is installed at the input terminal of the four-divider 9 (see Fig. 1), the input reception level of the dual-band asymmetric trunk intermediary device 100 is Amplified to 25dB gain [Gain], the reception level [RSSI] of the mobile communication terminal 30m away from the terminal antenna was measured as -75dBm.

That is, when the dual band asymmetric trunk intermediary device 100 is not installed, the reception level [RSSI] of the high frequency mobile communication signal is -100 dBm, whereas after the dual band asymmetric trunk relay device 100 is installed, the reception level [RSSI] Is very good at -75dBm.

Here, the maximum output of the dual band asymmetric trunk intermediary device 100 is enough to be 0.05W [17dBm] or less, so that a compact design is possible, and since the configuration requires only a small gain of about 40dB.

As described above, the embodiment according to the present invention is not limited to the above, and various modifications can be made within the scope apparent to those skilled in the art in connection with the present invention.

Although the present invention has been described in detail with reference to exemplary embodiments above, those skilled in the art to which the present invention pertains can make various modifications to the above-described embodiments without departing from the scope of the present invention. I will understand. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

As described above, the dual band asymmetric trunk intermediary apparatus of the present invention amplifies and transmits only the high frequency band signal among the received frequency band signals.

Accordingly, it is possible to guarantee high quality communication quality in a service shadow area such as indoor (In-Building) at low cost, and to be able to miniaturize the design.

Claims (7)

A signal separation unit which receives a plurality of mobile communication signals having different characteristics and separates each mobile communication signal according to a predetermined criterion; A bypass unit for bypassing at least one of the mobile communication signals separated by the signal separation unit; An amplifier for amplifying at least one of the mobile communication signals separated by the signal separator; And a signal combiner for combining and outputting a predetermined mobile communication signal inputted from the bypass unit and a mobile communication signal amplified by the amplifying unit. The method of claim 1, wherein the signal separation unit, A first low frequency bandpass filter for extracting a low frequency mobile communication signal having a relatively low frequency band from the mobile communication signal; A first uplink high frequency bandpass filter for extracting an uplink high frequency mobile communication signal from a high frequency mobile communication signal having a relatively high frequency band among the mobile communication signals; And a first downlink high frequency bandpass filter for extracting a downlink high frequency mobile communication signal from the high frequency mobile communication signal. The method of claim 1, wherein the bypass unit, And bypassing the low frequency mobile communication signal extracted by the first low frequency bandpass filter to the signal combiner. The method of claim 1, wherein the amplifying unit, An up-amp amplifying the uplink high-frequency mobile communication signal extracted by the first uplink high-frequency bandpass filter according to a preset amplification factor; And a down amplifier configured to amplify the downlink high frequency mobile communication signal extracted by the first downlink high frequency bandpass filter according to a preset amplification factor. The method of claim 1, wherein the amplifying unit, An up attenuator for reducing the signal level of the uplink high frequency mobile communication signal; A down attenuator for attenuating a signal level of the downlink high frequency mobile communication signal; And a gain adjusting device for setting gains of the up-down attenuator and the down-attenuator according to a user's selection. The method of claim 1, wherein the signal coupling unit, A second low frequency bandpass filter for filtering the low frequency mobile communication signal input from the bypass unit, a second uplink high frequency bandpass filter for filtering the uplink high frequency mobile communication signal input from the upstream amplifier, and the down amplifier A second downlink high frequency bandpass filter for filtering the downlink high frequency mobile communication signal inputted from the digital signal; Dual-band asymmetric trunk line mediation, characterized in that for combining the second low-frequency bandpass filter, the amplified high-frequency mobile communication signal output from at least one of the up-amp and the down-amp and output to the transmission line of the mobile communication signal. Device. The mobile communication signal supplied through the transmission line of the mobile communication signal includes a low frequency mobile communication signal of a relatively low frequency band, an uplink high frequency mobile communication signal of a relatively high frequency band, and a downlink high frequency mobile communication signal of a relatively high frequency band. A first triplexer separated by; A bypass unit for bypassing the low frequency mobile communication signal; An up amplifying unit for amplifying the uplink high frequency mobile communication signal; A downlink amplifying unit configured to amplify the downlink high frequency mobile communication signal; A second second combining the low frequency mobile communication signal input from the bypass unit and the amplified high frequency mobile communication signal output from at least one of the up amplifying unit and the down amplifying unit and outputting the combined high frequency mobile communication signal to a transmission line of the mobile communication signal; Dual band asymmetric trunk intermediary device comprising a triplexer.

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